-
MN HCMN HC
CNG NGH CH TO MYCNG NGH CH TO MY
11
CNG NGH CH TO MYCNG NGH CH TO MY
Ths. Phng Xun Lan
B mn CNCTM
Khoa C Kh
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Thng tin v mn hcThng tin v mn hc
Tn mn hc: Cng ngh ch to my ME3170
S n v hc trnh: 4 tn ch
Thi gian ln lp:
L thuyt: 60 tit
Nhim v ca sinh vin:
D lp
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Kim tra gia k
Thi cui k
nh gi sinh vin
Kim tra gia k
Thi cui k
D lp
22
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Thng tin v mn hcThng tin v mn hc
Mc tiu ca mn hc
Hiu r cc yu t c bn ca cng ngh gia cng chi tit
(cht lng b mt v chnh xc gia cng)
Nm vng nhng kin thc c bn v cng ngh ch to chi
tit c kh (chun, lng d gia cng)
Nm vng cc phng php gia cng ct gt (tin, phay)
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Gio vin
Ths. Phng Xun Lan
B mn Cng ngh ch to my, Vin C kh, HBKHN
a ch: B mn CNCTM 112 C5
in thoi: 0935 888 435
Email: [email protected]
Nm vng cc phng php gia cng ct gt (tin, phay)
-
Lch trnh hcLch trnh hc
Tun Ni dung
1 Gii thiu v mn hc, nhng khi nim c bn.
2 Cht lng b mt gia cng
3 chnh xc gia cng
4 Chun
5 Lp s g t (v d)
6 Lng d gia cng, tnh cng ngh trong kt cu
7 Kim tra gia k7 Kim tra gia k
8 Chn phi v cc phng php gia cng chun b phi
9 Cc phng php gia cng ct gt (tin)
10 Cc phng php gia cng ct gt (bo, xc, phay, chut)
11 Cc phng php gia cng ct gt (khoan, khot, doa, taro)
12 Cc phng php gia cng ct gt (mi)
13Cc phng php gia cng ct gt (mi nghin, mi khn, mi siutinh).
14nh bng. Cng ngh bi trn lm ngui ti thiu, gia cng tinh bng bin
dng do
15 Cc phng php gia cng tin tin 44
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Thng tin v mn hcThng tin v mn hc
Ti liu tham kho
- GVC Ph Trng Ho, - Ph.A.Barobasop
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
55
- GS.TS. Trn Vn ch- Cng ngh ch to my- NXB KHKT 2003
- GVC Ph Trng Ho, Nguyn Thanh Mai- Gio trnh cng ngh ch to my-
NXB GD 2004
- Ph.A.Barobasop- Dch Trn Vn ch- K thut phay- NXB CNKT HN
- P.M.ENHEJNUI- Dch Nguyn Quang Chu- K thut tin- NXB CNKT HN
-
CHNG 1CHNG 1
NHNG KHI NIM C BNNHNG KHI NIM C BN
66
Ths.Phng Xun Lan
B mn CNCTM
Vin C Kh
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.1 QU 1.1 QU TRNH SN XUT V QU TRNH CNG TRNH SN XUT V QU TRNH
CNG NGHNGH
Qu trnh sn xutT
hS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
77
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.1 QU 1.1 QU TRNH SN XUT V QU TRNH CNG TRNH SN XUT V QU TRNH
CNG NGHNGH
Qu trnh sn xut
Qu trnh sn xut l qu trnh con ngi tc ng vo ti
nguyn thin nhin bin n thnh sn phm phc v cho li
ch ca con ngi
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
88
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.1 QU 1.1 QU TRNH SN XUT V QU TRNH CNG TRNH SN XUT V QU TRNH
CNG NGHNGH
Qu trnh cng ngh
Qu trnh cng ngh l mt phn ca qu trnh sn xut trc
tip lm thay i trng thi v tnh cht ca i tng sn xut
TThayhay ii hnhhnh dngdng,,
ThayThay ii kchkch thcthc,,
TThayhay ii tnhtnh chtcht cc ll hoho caca vtvt liuliu vv
TThayhay ii vv trtr tngtng quanquan caca cccc bb phnphn caca
chichi tittit..
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Nhm tha mn cc yu cu
chnhchnh xcxc giagia cngcng,,
nhmnhm bb mtmt,,
VV trtr tngtng quanquan giagia cccc bb mtmt,,
chnhchnh xcxc bb mtmt,, vv vv......
99
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.3 1.3 THNH PHN CA THNH PHN CA QU QU TRNH CNG TRNH CNG
NGHNGH
Nguyn cng
Nguyn cng l mt phn ca quy trnh cng ngh c hon
thnh lin tc ti mt ch lm vic do mt hay mt nhm cng
nhn thc hin gia cng mt hoc mt s chi tit cng lc
Khi khng c cng nhn no phc v th l nguyn cng
c t ng ho hon ton
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1010
Gia cng chi tit trc
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.3 1.3 THNH PHN CA THNH PHN CA QU QU TRNH CNG TRNH CNG
NGHNGH
Nguyn cng
Nguyn cng l n v c bn ca quy trnh cng ngh.
Phn chia quy trnh cng ngh ra thnh cc nguyn cng c
ngha k thut v ngha kinh t.
nghangha kk thutthut chch tutu theotheo yuyu cucu kk thutthut
caca chichi tittit mm
phiphi rara cngcng bb mtmt nono bngbng phngphng phpphp bobo,,
phayphay hayhay mimi..
nghangha kinhkinh tt ll chch tutu theotheo snsn lnglng vv iuiu
kinkin snsn xutxut cc
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
nghangha kinhkinh tt ll chch tutu theotheo snsn lnglng vv iuiu
kinkin snsn xutxut cc
thth mm chiachia quyquy trnhtrnh cngcng nghngh rara lmlm
nhiunhiu nguynnguyn cngcng..
G
G l mt phn ca nguyn cng c hon thnh trong mt
ln g t mt hoc nhiu chi tit cng lc
1111
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.3 1.3 THNH PHN CA THNH PHN CA QU QU TRNH CNG TRNH CNG
NGHNGH
Bc
Bc l mt phn ca nguyn cng tin hnh gia cng mt
b mt (hoc nhiu b mt) bng mt dao hoc nhiu dao vi
ch ct khng thay i
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1212
Gia cng chi tit trca) Gia cng bng 1 dao; b) Gia cng bng 1
dao
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.3 1.3 THNH PHN CA THNH PHN CA QU QU TRNH CNG TRNH CNG
NGHNGH
V tr
V tr l mt phn ca nguyn cng c xc nh bi mt v
tr tng quan gia chi tit gia cng v my hoc gia chi tit
gia cng v g hay dng c ct
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1313
Gia cng chi tit trn my khoan 3 trc1. V tr g, tho chi tit; 2.
Khoan; 3. Khot; 4. Doa; 5. Bn my.
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.3 1.3 THNH PHN CA THNH PHN CA QU QU TRNH CNG TRNH CNG
NGHNGH
ng chuyn dao
ng chuyn dao l mt phn ca bc ht i mt lp vt
liu c cng ch ct v bng cng mt dao
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
ng tc
ng tc l mt hnh ng ca ngi cng nhn iu
khin my khi gia cng hoc lp rp1414
V d ng chuyn dao1, 2: on trc; a, b: 2 ln chuyn dao
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.4 CC 1.4 CC DNG SN DNG SN XUTXUT
Sn xut n chic
Sn xut n chic l sn xut c s lng sn phm hng
nm rt t (thng t mt n vi chc chic), sn phm khng
n nh do chng loi nhiu, chu k ch to li khng c xc
nh.
c im
Cc trang b, dng c vn nng
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Cc trang b, dng c vn nng
My cng c c b tr theo loi
Ti liu cng ngh di dng phiu tin trnh cng ngh
Trnh th c tay ngh cao
Nng sut lao ng thp, gi thnh cao
1515
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.4 CC 1.4 CC DNG SN DNG SN XUTXUT
Sn xut hng lot
Sn xut hng lot l dng sn xut c sn lng hng nm
khng qu t, sn phm c ch to theo tng loi vi chu k
xc nh. Sn phm tng i n nh.
Sn xut hng lot l dng ph bin nht trong ngnh ch to
my.
Tu theo sn lng v mc n nh ca sn phm m ngi
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Tu theo sn lng v mc n nh ca sn phm m ngi
ta chia ra: sn xut hng lot nh, sn xut hng lot va v
sn xut hng lot ln.
c im
Cc my c b chnh theo quy trnh cng ngh
S dng cc my vn nng, g chuyn dng.
C quy trnh cng ngh t m
Cng nhn c trnh tay ngh trung bnh1616
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.4 CC 1.4 CC DNG SN DNG SN XUTXUT
Sn xut hng khi
Sn xut hng khi l dng sn xut c sn lng rt ln sn
phm n nh trong thi gian di (c th t 1-5 nm)
c im
Cc my c b tr theo quy trnh cng ngh rt cht ch.
S dng nhiu my t hp my t ng my chuyn dng v
ng dy t ng
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
ng dy t ng
S dng g chuyn dng, dng c chuyn dng v cc thit
b o t ng ho.
Nng sut lao ng cao gi thnh sn phm h.
Cng nhn ng my c trnh tay ngh khng cao nhng
th iu chnh my li c trnh tay ngh cao.
1717
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.5 NHP 1.5 NHP SN XUTSN XUT
nh ngha
Nhp sn xut l khong thi gian lp li chu k gia cng (hoc
lp rp)
Nhp sn xut xc nh theo cng thc
q
Ft
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
tt NhpNhp snsn xutxut ((phtpht));;
FF ThiThi giangian lmlm vicvic tnhtnh theotheo ca,ca, thngthng,,
nmnm ((phtpht));;
qq SS lnglng snsn phmphm ((hochoc chichi tittit)) cc chch toto
trongtrong thithi giangian
FF..
1818
q
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.7 1.7 XC NH DNG SN XUT XC NH DNG SN XUT
Sn lng v sn lng hng nm
Sn lng l s lng sn phm c ch to ra trong mt
n v thi gian (nm, qu, thng).
Sn lng hng nm ca chi tit c xc nh theo cng
thc:
)100
1(1
mNN
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
NN ss chichi tittit cc snsn xutxut trongtrong mtmt nmnm;;
NN11 ss snsn phmphm (( ss mymy )) cc snsn xutxut trongtrong mtmt
nmnm;;
MM ss chichi tittit trongtrong mtmt snsn phmphm;;
ss chichi tittit cc chch toto thmthm dd phngphng (( == 55 77%%
));;
ss chichi tittit phph phmphm (( == 33 66%%))
1919
100
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.7 1.7 XC NH DNG SN XUT XC NH DNG SN XUT
Khi lng Q ca chi tit
Khi lng Q ca chi tit c xc nh theo cng thc:
VV thth tchtch caca chichi tittit (dm(dm33));;
khikhi lnglng caca vtvt liuliu (( caca thpthp ll
77,,825825kg/dmkg/dm33;; caca ganggang
dodo ll 77,,33kg/kg/ dmdm33 ;; caca nhmnhm ll 22,,77
kg/dmkg/dm33 vv caca ngng ll 88..7272
kg/dmkg/dm33 ))
.VQ
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Xc nh dng sn xut cn c vo sn lng hng nm N
v khi lng chi tit Q
2020
Dng sn xut
Q- khi lng ca chi tit
>200 kg 4 200 kg < 4 kg
Sn lng hng nm ca chi tit ( chic )
n chic
Hng lot nh
Hng lot va
Hng lot ln
Hng khi
< 5
55 100
100 300
300 1000
> 1000
< 10
10 200
200 500
500 5000
> 5000
< 100
100 500
500 5000
5000 50000
> 50000Xc nh dng sn xut
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
1.8 1.8 TP TRUNG V PHN TN NGUYN TP TRUNG V PHN TN NGUYN
CNGCNG
Phng php tp trung nguyn cng
Tp trung nguyn cng c ngha l b tr nhiu bc cng ngh
vo mt nguyn cng v c thc hin trn mt my
c ng dng cho nhng chi tit phc tp c nhiu b mt
cn gia cng dng my c nng sut cao.
Cho php nng cao h s s dng mt bng sn xut
Cn dng my c phc tp cao v iu chnh my cng rt
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Cn dng my c phc tp cao v iu chnh my cng rt
kh khn.
Phng php phn tn nguyn cng
Phn tn nguyn cng c ngha l chia quy trnh cng ngh ra
nhiu nguyn cng nh, mi nguyn cng c thc hin trn
mt my
S dng cc my thng dng, cc dng c tiu chun v cc
trang thit b n gin.2121
-
CHNG 2CHNG 2
CHT LNG B MT GIA CNGCHT LNG B MT GIA CNG
2222
Ths.Phng Xun Lan
B mn CNCTM
Khoa C Kh
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.1 2.1 CHT LNG B MT GIA CHT LNG B MT GIA CNGCNG
Khi nim
Cht lng b mt chi tit my l nhng tnh cht b mt ca
n c to thnh bi tnh cht ca kim loi v phng php
gia cng c.
Cht lng b mt gia cng ph thuc vo cc yu t sau:
Tnh cht ca vt liu gia cng
Phng php gia cng (tin, phay, bo, mi)
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Phng php gia cng (tin, phay, bo, mi)
Ch ct
cng vng ca h thng
Thng s hnh hc ca dao
Dung dch trn ngui
Cht lng b mt c nh gi theo ch tiu sau y:
c tnh hnh hc ca b mt
Tnh cht c l ca b mt2323
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.1 2.1 CHT LNG B MT GIA CHT LNG B MT GIA CNGCNG
c tnh hnh hc ca b mt nhm b mt
nhm b mt l tp hp tt c nhng vt li lm vi bc
cc ngn to thnh profin b mt chi tit trong phm vi chiu
di chun l
nhm b mt c hnh thnh do tc ng ca b mt gia
cng vi dng c ct
Phn loi nhm
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Phn loi nhm
nhmnhm dcdc ((trngtrng vivi phngphng caca vectvect tctc
ctct))
nhmnhm ngangngang ((vungvung gcgc vivi phngphng caca vectvect
tctc ctct))..
2424
nhm dc (a) v nhm ngang (b)
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.1 2.1 CHT LNG B MT GIA CHT LNG B MT GIA CNGCNG
c tnh hnh hc ca b mt nhm b mt
nhm b mt c o bng chiu cao nhp nh (Rz) v sai
lch profin trung bnh cng (Ra) ca lp b mt.
Chiu cao nhp nh (Rz)
LL tngtng trungtrung bnhbnh caca nmnm gigi trtr lnln nhtnht
hhmaxmax vv nmnm gigi trtr nhnh
nhtnht hhminmin trongtrong phmphm vivi chiuchiu didi chunchun
ll
5 51
hhR
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
hhimaximax,, hhiminimin:: tungtung caca nmnm nhnh caocao nhtnht
vv nmnm nhnh thpthp nhtnht
((trongtrong phmphm vivi chiuchiu didi chunchun l)l) vv cc xcxc
nhnh tt ngng cchcch
uu caca ngng trungtrung bnhbnh vv khngkhng ctct profinprofin bb
mtmt
Sai lch profin trung bnh cng (Ra)
LL gigi trtr trungtrung bnhbnh cngcng caca tttt cc cccc saisai
ss profinprofin yiyi trongtrong phmphm
vivi chiuchiu didi chunchun ll
2525
1 1minmax
5
1
iiiz hhR
n
iix
l
x
ia yn
dyl
R10
11
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.1 2.1 CHT LNG B MT GIA CHT LNG B MT GIA CNGCNG
c tnh hnh hc ca b mt nhm b mt
Chiu cao nhp nh (Rz) v sai lch profin trung bnh cng (Ra)
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2626
n
iix
l
x
ia yn
dyl
R10
11
5
...... 1042931 hhhhhhRz
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.1 2.1 CHT LNG B MT GIA CHT LNG B MT GIA CNGCNG
c tnh hnh hc ca b mt
Cc cp nhn bng b mt
SS dngdng trtr ss RRaa khikhi nhnnhn bb mtmt nmnm trongtrong
phmphm vivi cpcp 66 (R(Raa ==
22,,55 m)m) nn cpcp 1212 (R(Raa == 00,,0404 m)m)..
SS dngdng trtr ss RRzz khikhi nhnnhn bb mtmt nmnm trongtrong
phmphm vivi tt cpcp 11
nn cpcp 55 ((RRzz == 320320 2020 m)m) hochoc tt cpcp 1313 nn
cpcp 1414 ((RRzz == 00,,0808
00,,0505 m)m)..
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2727
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.1 2.1 CHT LNG B MT GIA CHT LNG B MT GIA CNGCNG
c tnh hnh hc ca b mt
Cc cp nhn bng
Cht lng b mt Cp Ra Rz Chiu di chun
Th
1 80 320
82 40 160
3 20 80
4 10 40
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2828
4 10 402,5
Bn tinh
5 5 20
6 2,5 10
0,87 1,25 6,3
Tinh
8 0,63 3,2
9 0,32 1,6
0,2510 0,16 0,8
11 0,08 0,4
Siu tinh
12 0,04 0,02
13 0,02 0,080,08
14 0,01 0,05
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.1 2.1 CHT LNG B MT GIA CHT LNG B MT GIA CNGCNG
sng b mt
L chu k khng bng phng ca b mt chi tit my c quan
st trong phm vi ln hn nhm b mt (t 1-10mm).
sng b mt l tp hp tt c nhp nh c lp li theo
chu k trn b mt chi tit (
Nguyn nhn gy ra sng l do cng vng ca h thng
cng ngh (mydaochi tit g)
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
cng ngh (mydaochi tit g)
nhm b mt ng vi t l:
l/hl/h == 00 5050
sng b mt ng vi t l:
L/HL/H == 5050 10001000
2929
Tng quan v nhm v sng b mt
L: khong cch 2 nh sng.l: khong cch 2 nh nhp nh t vi.H: chiu cao
ca sng.h: chiu cao nhp nh t vi.
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.1 2.1 CHT LNG B MT GIA CHT LNG B MT GIA CNGCNG
Tnh cht c l ca mt gia cng
cng t vi
cngcng tt vivi cc phtpht sinhsinh trongtrong ququ trnhtrnh
giagia cngcng didi tctc
dngdng caca lclc ctct..
McMc vv chiuchiu susu caca lplp bb binbin cngcng phph thucthuc
vovo tctc dngdng
caca lclc ctct,, mcmc binbin dngdng dodo caca kimkim loiloi vv
nhnh hnghng nhitnhit
trongtrong vngvng ctct
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
ng sut d
ngng sutsut dd ll ngng sutsut tntn titi lplp bb mtmt caca chichi
tittit khikhi khngkhng
cc cccc tctc ngng bnbn ngoingoi ((vv dd lclc vv nhitnhit ))
Cu trc lp b mt
CuCu trctrc lplp bb mtmt ll hnhhnh dngdng,, kchkch thcthc vv
cccc bb trtr caca cccc
htht kimkim loiloi..
SS thaythay ii cucu trctrc lplp bb mtmt cc thth cc tnhtnh chtcht
cccc bb vv gygy rara
vtvt chychy cccc bb vv cccc khuytkhuyt tttt khckhc
3030
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.2 NH HNG CA CHT LNG B MT TI TNH CHT 2.2 NH HNG CA CHT LNG B MT
TI TNH CHT S DNG CA CHI TIT MY S DNG CA CHI TIT MY
Cc tnh cht s dng ca chi tit my
Tnh chng mn
LL khkh nngnng caca bb mtmt chichi tittit mymy chngchng lili
hinhin tngtng mimi mnmn
trongtrong ququ trnhtrnh ss dngdng..
KhiKhi bb mnmn kchkch thcthc vv hnhhnh dngdng caca chichi tittit
thaythay ii ThayThay ii
tnhtnh nn khpkhp caca chichi tittit ThayThay ii vv trtr tngtng
quanquan caca cccc cc
cucu mymy vv phph huhu mymy trongtrong ququ trnhtrnh lmlm
vicvic
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
bn mi
LL khkh nngnng caca chichi tittit chngchng lili titi trngtrng
chuchu kk ii dudu trongtrong
ququ trnhtrnh ss dngdng.. bnbn mimi khngkhng ss lmlm chocho
chichi tittit bb vv
Cc tnh cht khc
TnhTnh chngchng nn mnmn hoho hchc,, tnhtnh dndn inin,, dndn
tt
3131
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.2 NH HNG CA CHT LNG B MT TI TNH CHT 2.2 NH HNG CA CHT LNG B MT
TI TNH CHT S DNG CA CHI TIT MY S DNG CA CHI TIT MY
nh hng ca nhm b mt
Mi quan h gia nhm v qu trnh mn
QuQu trnhtrnh mnmn caca cpcp chichi tittit mymy xtxt trntrn cc
ss mama stst bb mtmt
tiptip xcxc cc 33 giaigiai onon:: mnmn banban uu,, mnmn bnhbnh
thngthng vv mnmn
khckhc litlit
M hnh hai b mt tip xc
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
MnMn banban uu cc thth lmlm chocho chiuchiu caocao nhpnhp nhnh
gimgim 65657575%%.. CcCc
nhnh nhpnhp nhnh bb mnmn nhanhnhanh lmlm khekhe hh lplp ghpghp
tngtng lnln.. ((MnMn
chychy rr))
MnMn bnhbnh thngthng:: QuQu trnhtrnh mnmn trtr nnnn bnhbnh
thngthng vv chmchm
((MnMn lmlm vicvic))
MnMn khckhc litlit:: BB mtmt tiptip xcxc bb trctrc rara,, cucu
trctrc bb mtmt chichi tittit bb
phph hnghng ((MnMn phph hyhy)) 3232
M hnh hai b mt tip xc
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.2 NH HNG CA CHT LNG B MT TI TNH CHT 2.2 NH HNG CA CHT LNG B MT
TI TNH CHT S DNG CA CHI TIT MY S DNG CA CHI TIT MY
nh hng ca nhm b mt
Mi quan h gia nhm v qu trnh mn
QuanQuan hh giagia lnglng mnmn vv thithi giangian ss dngdng
nhmnhm bb mtmt nhnh hnghng nn tuitui thth caca chichi tittit
mymy..
nhmnhm cngcng lnln (a),(a), thithi giangian mnmn banban uu xyxy
rara nhanhnhanh,, thithi giangian ss
dngdng ngnngn
TyTy iuiu kinkin cc thth ChnChn nhmnhm bb mtmt titi uu
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3333
Qu trnh mi mn ca cp chi tit tip xc
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.2 NH HNG CA CHT LNG B MT TI TNH CHT 2.2 NH HNG CA CHT LNG B MT
TI TNH CHT S DNG CA CHI TIT MY S DNG CA CHI TIT MY
nh hng ca nhm b mt
nhm b mt ti u
CC thth xcxc nhnh nhmnhm bb mtmt RaRa cc mnmn UU nhnh
nhtnht..
nhmnhm bb mtmt RaRa cc mnmn UU nhnh nhtnht phph thucthuc vovo
dngdng
tiptip xcxc vv iuiu kinkin ss dngdng
m
n b
an
u U
2
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3434
mn
ban
u
U
Nhp nh t vi Ra0 Ra1 Ra2
1
nh hng ca nhm b mt ti mn ca chi tit1. iu kin lm vic nh 2. iu kin
lm vic nng
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.2 NH HNG CA CHT LNG B MT TI TNH CHT 2.2 NH HNG CA CHT LNG B MT
TI TNH CHT S DNG CA CHI TIT MY S DNG CA CHI TIT MY
nh hng ca nhm b mt
nhm nh hng n bn mi
VV yy nhpnhp nhnh ll nini tptp trungtrung ngng sutsut cc bitbit
khikhi nhmnhm caocao..
bnbn mimi tngtng khikhi nhmnhm gimgim
BB mtmt vtvt liuliu thpthp cc nhnh bngbng cc bnbn mimi caocao
hnhn 4040%%
soso vivi bb mtmt khngkhng cc nhnh bngbng
nhm nh hng n tnh chng n mn ho hc
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
nhmnhm cngcng caocao thth chiuchiu susu rnhrnh caca nn cngcng
lnln TpTp trungtrung
nhiunhiu chtcht nn mnmn bb mtmt QuQu trnhtrnh nn mnmn hoho hchc
trntrn lplp bb
mtmt chichi tittit theotheo snsn caca nhpnhp nhnh vv hnhhnh
thnhthnh nhpnhp nhnh mimi..
3535
Cht bnNhp nh c
Nhp nh mi
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.2 NH HNG CA CHT LNG B MT TI TNH CHT 2.2 NH HNG CA CHT LNG B MT
TI TNH CHT S DNG CA CHI TIT MY S DNG CA CHI TIT MY
nh hng ca nhm b mt
nhm nh hng n chnh xc lp ghp, bn ca mi
ghp cng, cng vng tip xc
chnhchnh xcxc caca mimi lplp ghpghp phph thucthuc vovo chtcht
lnglng cccc bb
mtmt lplp ghpghp..
bnbn caca cccc mimi lplp,, nn nhnh caca chch lplp phph thucthuc
vovo
nhmnhm bb mtmt lplp ghpghp
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
GiGi trtr nhmnhm bb mtmt hphp ll cncn cc chnchn trntrn cc ss
trngtrng
dungdung saisai ..
KhiKhi ngng knhknh lplp ghpghp >>5050mmmm
RRzz == ((00,,11 00,,1515))
KhiKhi ngng knhknh lplp ghpghp trongtrong khongkhong
18185050mmmm
RRzz == ((00,,1515 00,,22))
KhiKhi ngng knhknh lplp ghpghp
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.2 NH HNG CA CHT LNG B MT TI TNH CHT 2.2 NH HNG CA CHT LNG B MT
TI TNH CHT S DNG CA CHI TIT MY S DNG CA CHI TIT MY
nh hng lp bin cng b mt
cng t vi hnh thnh trong qu trnh ct cho php nng cao
tnh chng mn ca b mt chi tit
Bin cng b mt trong qu trnh gia cng c c nh hng tt
n bn mi ca chi tit my (ngn vt nt xut hin).
Bin cng b mt trong qu trnh gia cng c c kh nng lm
tng tnh chng n mn ho hc ca b mt chi tit
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
tng tnh chng n mn ho hc ca b mt chi tit
B mt bin cng c th tng bn mi ca chi tit ln
khong 20%, tng chng mn ca n ln 23 ln.
nh hng ca ng sut d
ng sut d nn trn lp b mt c kh nng lm tng bn
mi ca chi tit (c th tng ln 50%)
ng sut d ko trn lp b mt lm gim bn mi ca chi
tit. (c th gim i 30%)3737
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.3 2.3 CC YU T NH HNG N CHT LNG B MT CC YU T NH HNG N CHT LNG B
MT CHI TIT MYCHI TIT MY
nh hng n nhm b mt
Cc thng s hnh hc ca dao v lng chy dao
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3838
S to thnh nhp nh b mt
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.3 2.3 CC YU T NH HNG N CHT LNG B MT CC YU T NH HNG N CHT LNG B
MT CHI TIT MYCHI TIT MY
nh hng n nhm b mt
Cc thng s hnh hc ca dao v lng chy dao
Gim S
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3939nh hng ca thng s hnh hc ca dao tin v lng chy dao ti nhm b
mt
Gim 1 C r1
Tng r
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.3 2.3 CC YU T NH HNG N CHT LNG B MT CC YU T NH HNG N CHT LNG B
MT CHI TIT MYCHI TIT MY
nh hng n nhm b mt
Cc thng s hnh hc ca dao v lng chy dao S
QuaQua thcthc nghimnghim,, ngingi tata xcxc nhnh mimi quanquan
hh giagia cccc thngthng
ss:: nhpnhp nhnh tt vivi RzRz,, lnglng tintin daodao S,S, bnbn
knhknh mimi daodao r,r,
chiuchiu dydy phoiphoi nhnh nhtnht cc thth ctct cc hhminmin..
(GS(GS.. NgaNga TrbsepTrbsep ))
KhiKhi SS >> 00,,1515 mm/mm/vngvng ththr
SRz
8
2
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
KhiKhi SS
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.3 2.3 CC YU T NH HNG N CHT LNG B MT CC YU T NH HNG N CHT LNG B
MT CHI TIT MYCHI TIT MY
nh hng n nhm b mt
Tc ct V
KhiKhi ctct thpthp CacbonCacbon vnvn tctc thpthp,, nhitnhit ctct
khngkhng caocao,, phoiphoi kimkim
loiloi tchtch dd,, binbin dngdng caca lplp bb mtmt khngkhng
nhiunhiu RRzz thpthp
KhiKhi tngtng vnvn tctc ctct nn khongkhong VV == 2020 4040
m/phm/ph LoLo daodao lmlm
tngtng nhmnhm bb mtmt giagia cngcng..
NuNu tiptip tctc tngtng vnvn tctc ctct,, lolo daodao bb nungnung
nngnng nhanhnhanh hnhn
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
lolo daodao bb cuncun ii ((binbin mtmt khikhi vnvn tctc ctct
khongkhong VV == 30306060 m/phm/ph))..
ViVi vnvn tctc ctct VV >> 6060 m/phm/ph thth lolo daodao
khngkhng hnhhnh thnhthnh cc nnnn
nhmnhm bb mtmt giagia cngcng gimgim,, nhnnhn tngtng..
4141
nh hng ca tc ct ti nhm b mtkhi gia cng thp
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.3 2.3 CC YU T NH HNG N CHT LNG B MT CC YU T NH HNG N CHT LNG B
MT CHI TIT MYCHI TIT MY
nh hng n nhm b mt
Lng chy dao S
KhiKhi giagia cngcng thpthp CarbonCarbon,, vivi gigi trtr lnglng
chychy daodao SS == 00,,0202 00,,1515
mm/vgmm/vg thth bb mtmt giagia cngcng cc nhpnhp nhnh tt vivi
gimgim
NuNu gimgim SS > 00,,1515 mm/vgmm/vg thth nhmnhm bb mtmt
tngtng lnln
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
nhiunhiu..
4242
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.3 2.3 CC YU T NH HNG N CHT LNG B MT CC YU T NH HNG N CHT LNG B
MT CHI TIT MYCHI TIT MY
nh hng n nhm b mt
Chiu su ct t
NuNu chiuchiu susu ctct ququ lnln thth rungrung ngng trongtrong
ququ trnhtrnh ctct tngtng,, dodo
nhmnhm cc thth tngtng
NuNu chiuchiu susu ctct ququ nhnh vv khikhi lili ctct ss bb
trttrt vv ctct
khngkhng linlin tctc,, dodo nhmnhm bb mtmt lili tngtng.. HinHin
tngtng trttrt
daodao thngthng xyxy rara vivi gigi trtr chiuchiu susu ctct tt
== 00,,0202 00,,0303 (mm)(mm)..
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Tnh cht vt liu gia cng
VtVt liuliu dodo vv daidai ((thpthp tt CacbonCacbon)) dd binbin
dngdng dodo ss chocho
nhmnhm bb mtmt lnln hnhn vtvt liuliu cngcng vv gingin..
cngcng caca vtvt liuliu giagia cngcng tngtng thth chiuchiu
caocao nhpnhp nhnh tt vivi
gimgim vv hnhn chch nhnh hnghng caca tctc ctct titi chiuchiu
caocao nhpnhp nhnh
tt vivi..
GGimim tnhtnh dodo caca vtvt liuliu giagia cngcng bngbng binbin
cngcng bb mtmt cngcng
lmlm gimgim chiuchiu caocao nhpnhp nhnh tt vivi..
4343
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.3 2.3 CC YU T NH HNG N CHT LNG B MT CC YU T NH HNG N CHT LNG B
MT CHI TIT MYCHI TIT MY
nh hng n nhm b mt
Rung ng cng ngh
QuQu trnhtrnh rungrung ngng trongtrong hh thngthng cngcng nghngh
toto rara chuynchuyn ngng
tngtng ii cc chuchu kk giagia dngdng cc ctct vv chichi tittit
giagia cngcng,, lmlm thaythay
ii iuiu kinkin mama stst,, gygy nnnn sngsng vv nhpnhp nhnh tt
vivi trntrn bb mtmt
giagia cngcng..
KhiKhi hh thngthng cngcng nghngh cc rungrung ngng,, sngsng vv
nhpnhp nhnh tt
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
vivi dcdc ss tngtng nunu lclc ctct tngtng,, chiuchiu susu ctct
lnln vv tctc ctct caocao..
nhmnhm caca bb mtmt giagia cngcng cncn phph thucthuc cngcng
vngvng caca chichi
tittit khikhi kpkp chtcht..
TnhTnh trngtrng mymy cc nhnh hnghng quytquyt nhnh nn nhmnhm caca
bb mtmt
giagia cngcng..
4444
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.3 2.3 CC YU T NH HNG N CHT LNG B MT CC YU T NH HNG N CHT LNG B
MT CHI TIT MYCHI TIT MY
nh hng n bin cng b mt
Khi tng lc ct, nhit ct v mc bin dng do th mc
bin cng b mt tng.
Nu gc trc tng t gi tr m n gi tr dng th mc
v chiu su bin cng b mt chi tit gim.
Vn tc ct tng lm gim thi gian tc ng ca lc gy ra
bin dng kim loi, do lm gim chiu su bin cng v mc
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
bin dng kim loi, do lm gim chiu su bin cng v mc
bin cng b mt.
VV > 2020 m/phm/ph:: chiuchiu susu lplp binbin cngcng gimgim
theotheo gigi trtr caca lnglng
chychy daodao
Ngoi ra, bin cng b mt cng tng nu dng c ct b mn,
b cn.
4545
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.4 PHNG PHP M BO CHT LNG B MT2.4 PHNG PHP M BO CHT LNG B MT
Phng php t bng b mt
Phng php gia cng c Cp bng
Tin, bo th 3
Tin,bo tinh 4 - 6
Tin,bo rt tinh 6 - 7
Phay th 4
Phay tinh 5 -7
Khoan, khot 3 - 6
Doa 6 - 8
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
4646
Doa 6 - 8
Chut 6 -7
Chut tinh 7 - 8
Mi th 5 - 6
Mi tinh 7 - 8
Mi rt tinh 9 -10
Mi nghin 9 -13
Mi khn 7 -10
Mi siu tinh xc 10 -14
nh bng bng bt mi 11-13
nh bng bng vi 12 - 14
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.4 PHNG PHP M BO CHT LNG B MT2.4 PHNG PHP M BO CHT LNG B MT
Phng php t cng b mt.
Phng php gia cng bin cng(%) Chiu su bin cng(m)
Tin th 120-150 30-50
Tin tinh 140-180 20-60
Phay bng dao phay mt u 140-160 40-100
Phay bng dao phay tr 120-140 40-80
Khoan v khot 160-170 180-200
Doa 150-160 150-200
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
4747
Chut 150-200 20-75
Phay ln rng v xc rng 160-200 120-150
C rng 120-180 80-100
Mi trn thp cha nhit luyn 140-160 30-60
Mi trn ngoi thp t cacbon 160-200 30-60
Mi trn ngoi thp nhit luyn 125-130 20-40
Mi phng 150 16-25
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.4 PHNG PHP M BO CHT LNG B MT2.4 PHNG PHP M BO CHT LNG B MT
Phng php t ng sut d b mt
Tng tc ct (V) hoc tng lng chy dao (S) cng c th
tng hoc gim ng sut d trn b mt gia cng ca chi tit
my.
Lng chy dao (S) lm tng chiu su c ng sut d
Gc trc () c tr s m gy ra ng sut d nn (ng sut d
c li).
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
c li).
Gia cng vt liu gin bng dng c ct c li gy ra ng sut
d nn, cn gia cng bng vt liu do thng gy ra ng sut
d ko.
Gia cng bng mi thng gy ra ng sut d ko, cn gia
cng bng ai mi thng to ra ng sut d nn.
4848
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.5 PHNG PHP NH GI CHT LNG B MT2.5 PHNG PHP NH GI CHT LNG B
MT
nh gi nhm b mt
Phng php quang hc (dng knh hin vi Linich)
Phng php o nhm Ra, Rz, Rmax bng my o profin
Phng php so snh bng mt (phng php ny cho php
xc nh c cp bng t 3 n 7)
nh gi mc v chiu su bin cng
Dng u kim cng tc ng ln b mt mu mt lc P, sau
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Dng u kim cng tc ng ln b mt mu mt lc P, sau
xc nh din tch b mt mu do u kim cng n xung.
HHvv binbin cngcng (N/mm(N/mm22))
PP lclc tctc dngdng caca uu kimkim cngcng(N)(N);;
SS dindin tchtch bb mtmt dodo uu kimkim cngcng nn xungxung
(mm(mm22))..
4949
S
PHv
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
2.5 PHNG PHP NH GI CHT LNG B MT2.5 PHNG PHP NH GI CHT LNG B
MT
nh gi ng sut d
Phng php tia Rnghen.
DngDng tiatia RnghenRnghen kchkch thchthch trntrn bb mtmt mumu
mtmt lplp dydy 551010 mm
vv sausau mimi lnln kchkch thchthch tata chpchp nhnh thth
RnghenRnghen..
ChoCho phpphp oo cc cc chiuchiu susu binbin cngcng..
RtRt phcphc tptp vv tntn nhiunhiu thithi giangian chocho iuiu
chnhchnh thth RnghenRnghen
((mtmt khongkhong 1010 gigi trongtrong mtmt lnln oo))..
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Tnh ton lng bin dng
SauSau khikhi htht tngtng lplp mngmng kimkim loiloi bngbng
phngphng phpphp hoho hchc vv
inin cc khkh tata tnhtnh tonton lnglng binbin dngdng caca chichi
tittit mumu.. DaDa vovo
lnglng binbin dngdng nyny tata xcxc nhnh cc ngng sutsut dd..
CngCng cc thth dngdng tiatia RnghenRnghen oo khongkhong cchcch
giagia cccc phnphn tt
trongtrong lplp lplp kimkim loiloi binbin dngdng vv khngkhng
binbin dngdng.. ViVi khongkhong
cchcch nyny cc thth xcxc nhnh cc ngng sutsut dd..
5050
-
CHNG 3CHNG 3
CHNH XC GIA CNG CHNH XC GIA CNG
5151
Ths.Phng Xun Lan
B mn CNCTM
Khoa C Kh
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.1 KHI NIM3.1 KHI NIM
Khi nim
2.5
48
R38
6
O2
4 }0.0
20
2,5
2,5
2-lc M12
1.2
5
0,6
3
1.251,25
56
R32
R28
6lc-M6
76
32
30
70
25
R0.5
O24 }0.05
O1
4 }0.2
R4
R12
8R2
2,5
A
B
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
5252
1.25
15
3
R6
R3
2,5
2.5
2,5
56
26
R2
80
60
40
R2
42
}0.2
0
12
O20
+0.0
20
6
10
O3
0
106
2
3
10
R2
26
50
2,5
B
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.1 KHI NIM3.1 KHI NIM
Khi nim
chnh xc gia cng ca chi tit my l mc ging nhau
v kch thc, hnh dng hnh hc, v tr tng quan ca chi tit
gia cng trn my v chi tit l tng trn bn v.
chnh xc kch thc t c.
ll chnhchnh xcxc vv kchkch thcthc thngthng hochoc kchkch thcthc
gcgc..
chnhchnh xcxc kchkch thcthc cc nhnh gigi bngbng saisai ss caca
kchkch thcthc
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
chnhchnh xcxc kchkch thcthc cc nhnh gigi bngbng saisai ss caca
kchkch thcthc
thcthc soso vivi kchkch thcthc ll tngtng trntrn bnbn vv..
chnh xc hnh dng hnh hc.
ll mcmc phph hphp giagia hnhhnh dngdng hnhhnh hchc thttht vv
hnhhnh dngdng
hnhhnh hchc ll tngtng caca chichi tittit.. VV dd,, cncn,,
ovanovan,, phngphng
chnh xc v tr tng quan.
chnhchnh xcxc nyny thcthc ss ll ss xoayxoay ii mtmt gcgc nono
caca bb mtmt
nyny soso vivi bb mtmt kiakia ((dngdng lmlm chunchun)).. VV dd,,
songsong songsong,,
vungvung gcgc,, ngng tmtm,, vv..vv......5353
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.1 KHI NIM3.1 KHI NIM
ngha
chnh xc l c tnh ch yu ca chi tit my
chnh xc ca qu trnh sn xut ng vai tr ht sc quan
trng
NngNng caocao chnhchnh xcxc caca phiphi chocho phpphp gimgim
khikhi lnglng giagia
cngcng cc,, gimgim lnglng dd giagia cngcng vv tittit kimkim
nguynnguyn vtvt liuliu..
NngNng caocao chnhchnh xcxc giagia cngcng cc chocho phpphp
loiloi bb cngcng vicvic iuiu
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
NngNng caocao chnhchnh xcxc giagia cngcng cc chocho phpphp
loiloi bb cngcng vicvic iuiu
chnhchnh khikhi lplp rprp,, toto iuiu kinkin chocho vicvic lplp
lnln honhon tonton vv thcthc
hinhin phngphng phpphp lplp rprp theotheo dydy chuynchuyn..
5454
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.1 KHI NIM3.1 KHI NIM
Quan h gia chnh xc v gi thnh
chnh xc kinh t l chnh xc t c trong iu kin
sn xut bnh thng vi gi thnh h nht.
chnh xc c th t ti l chnh xc t c trong
nhng iu kin c bit khng tnh n gi thnh gia cng
(my chnh xc, g tt, cng nhn c tay ngh cao,v.v...).
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
5555
Dung sai(sai s)
C (gi thnh)
Quan h gia chnh xc (sai s) v gi thnh C
123C
Quan h gia gi thnh gia cng C v chnh xc (sai s )
1. tin th; 2. tin tinh; 3. mi
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.2 TNH CHT CA SAI S GIA CNG 3.2 TNH CHT CA SAI S GIA CNG
Cc nguyn nhn gy ra sai s h thng c nh
Sai s l thuyt ca phng php ct.
Sai s ch to ca my, dao, g.
Bin dng nhit ca chi tit gia cng
Cc nguyn nhn gy ra sai s h thng thay i
Dng c hao mn theo thi gian gia cng.
Bin dng nhit ca my, dao g.
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Bin dng nhit ca my, dao g.
5656
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.2 TNH CHT CA SAI S GIA CNG 3.2 TNH CHT CA SAI S GIA CNG
Cc nguyn nhn gy ra sai s ngu nhin
cng ca vt liu khng ng u.
Lng d gia cng khng ng u.
V tr ca phi trong g thay i (dn n sai s g t)
Thay i ca ng sut d.
G dao, mi dao nhiu ln.
Thay i nhiu my gia cng mt lot chi tit.
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Thay i nhiu my gia cng mt lot chi tit.
Dao ng nhit ca qu trnh ct.
Cc loi rung ng trong qu trnh ct.
5757
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.3 CC PHNG PHP T CHNH XC GIA CNG 3.3 CC PHNG PHP T CHNH XC GIA
CNG
Phng php ct th
Bn cht ca phng php l sau khi g phi trn my ngi
cng nhn a dao vo v tin hnh ct th mt lng d nht
nh, sau dng my kim tra kch thc.
Nu cha t yu cu th li iu chnh dao n su thm na ri
li ct th v kim tra, cng vic c lp li cho n khi t
c kch thc yu cu.
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
c kch thc yu cu.
Trc khi ct th, phi thng c ly du ngi th c
th a vo v tr mt cch nhanh chng v trnh ph phm
5858
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.3 CC PHNG PHP T CHNH XC GIA CNG 3.3 CC PHNG PHP T CHNH XC GIA
CNG
Phng php ct th
u im
TrnTrn mymy khngkhng chnhchnh xcxc vnvn cc thth tt cc chnhchnh
xcxc caocao
LoiLoi trtr nhnh hnghng caca mnmn daodao khikhi giagia cngcng cc
lotlot chichi tittit
KhngKhng cncn chch toto gg tt tintin mm chch cncn ngingi thth gg
daodao
chnhchnh xcxc..
Nhc im
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
chnhchnh xcxc giagia cngcng phph thucthuc vovo bb dydy nhnh
nhtnht caca lplp phoiphoi
htht ii..
NgiNgi thth lmlm vicvic cngcng thngthng nnnn dd mtmt,, dodo cc
thth gygy rara phph
phmphm..
NngNng sutsut thpthp dodo phiphi ctct nhiunhiu lnln..
DoDo nngnng sutsut thpthp nnnn gigi thnhthnh giagia cngcng
caocao..
5959
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.3 CC PHNG PHP T CHNH XC GIA CNG 3.3 CC PHNG PHP T CHNH XC GIA
CNG
Phng php ct th
Phm vi ng dng
ChCh cc ss dngdng trongtrong snsn xutxut nn chicchic vv hnghng
lotlot nhnh,, trongtrong
snsn xutxut thth vv trongtrong sasa chacha hochoc trongtrong
cccc phnphn xngxng dngdng
cc..
TrongTrong snsn xutxut hnghng lotlot lnln vv hnghng khikhi,,
phngphng phpphp ctct thth
chch yuyu cc dngdng nguynnguyn cngcng mimi bibi vv lnglng mnmn
caca cc
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
thth cc bb lili nhnh iuiu chnhchnh bngbng taytay trongtrong ququ
trnhtrnh giagia
cngcng..
NuNu ss dngdng hh thngthng iuiu chnhchnh tt ngng thth phngphng
phpphp ctct thth
ss khngkhng cncn cc ss dngdng vivi nguynnguyn cngcng mimi..
6060
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.3 CC PHNG PHP T CHNH XC GIA CNG 3.3 CC PHNG PHP T CHNH XC GIA
CNG
Phng php t ng t kch thc
Bn cht ca phng php ny l trc khi gia cng dng c
ct c iu chnh sn c v tr tng quan c nh so vi
chi tit gia cng.
V tr ny ca chi tit gia cng c m bo nh c cu nh
v ca g. Cn g cng c v tr xc nh trn my nh c
cu nh v ring.
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
cu nh v ring.
6161
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.3 CC PHNG PHP T CHNH XC GIA CNG 3.3 CC PHNG PHP T CHNH XC GIA
CNG
Phng php t ng t kch thc
u im
mm bobo chnhchnh xcxc giagia cngcng,, gimgim phph phmphm..
ChCh ctct mtmt lnln ll tt kchkch thcthc,, khngkhng mtmt thithi
giangian lyly dudu vv
ctct thth,, dodo nngnng sutsut giagia cngcng tngtng
SS dngdng hphp ll nhnnhn cngcng cc trnhtrnh taytay nghngh
caocao..
NngNng caocao hiuhiu ququ kinhkinh tt
Nhc im
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Nhc im
ChiChi phph chocho vicvic thitthit kk,, chch toto gg cngcng nhnh
chichi phph chocho vicvic
iuiu chnhchnh mymy,, iuiu chnhchnh daodao tngtng
ChiChi phph chocho vicvic chch toto phiphi chnhchnh xcxc ii
khikhi khngkhng bb lili cc
nunu ss chichi tittit giagia cngcng ququ tt..
NuNu dngdng cc maumau mnmn thth kchkch thcthc cc iuiu chnhchnh
ss thaythay
ii nhanhnhanh,, dodo cncn phiphi iuiu chnhchnh lili nhiunhiu
lnln..
Phm vi ng dng
TrongTrong snsn xutxut hnghng lotlot lnln vv hnghng khikhi tt
chnhchnh xcxc giagia
cngcng chch yuyu ngingi tata dngdng phngphng phpphp tt ngng tt
kchkch thcthc..6262
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
cng vng ca h thng cng ngh
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
Khi tin, di tc dng ca lc ct, dao tin b dch chuyn mt
lng l . Lc , bn knh ca chi tit gia cng s tng t (R)
n (R + R). Ta c:
V z l rt nh so vi R nn l i lng nh khng ng k,
gn ng ta c
6363
2
22 1
yR
zyRzyRRRRtt
yRRtt yR
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
cng vng ca h thng cng ngh
ii vivi daodao mtmt lili ctct,, lnglng chuynchuyn vv yy cc nhnh
hnghng titi kchkch
thcthc giagia cngcng nhiunhiu nhtnht,, cncn chuynchuyn vv zz
khngkhng nhnh hnghng
nhiunhiu nn kchkch thcthc giagia cngcng..
TrongTrong tnhtnh tonton,, nn gingin tata chch giigii hnhn nn
lclc hnghng knhknh PyPy,,
trngtrng hphp yuyu cucu chnhchnh xcxc caocao,, thth phiphi
tnhtnh nn nhnh
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
hnghng caca PPxx,, PPzz bngbng cchcch nhnnhn thmthm hh ss..
6464
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
cng vng ca h thng cng ngh
ii vivi daodao nhiunhiu lili ctct hochoc daodao nhnh hnhhnh thth
cc trngtrng hphp
cc baba chuynchuyn vv x,x, y,y, zz uu cc nhnh hnghng nn chnhchnh
xcxc giagia
cngcng..
xcxc nhnh nhnh hnghng nyny,, ngingi tata phiphi dngdng phngphng
phpphp
thcthc nghimnghim.. PhnPhn lclc ctct tctc dngdng lnln hh
thngthng cngcng nghngh
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
MGDCMGDC thnhthnh baba thnhthnh phnphn lclc PPxx,, PPyy,, PPzz,,
sausau oo binbin dngdng
caca hh thngthng theotheo baba phngphng X,X, Y,Y, ZZ..
6565
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
cng vng ca h thng cng ngh
cngcng vngvng caca hh thngthng cngcng nghngh JJ ll khkh nngnng
chngchng lili
binbin dngdng caca nn dodo ngoingoi lclc gygy rara..
JJ cngcng vngvng ((kNkN/m/m hochoc kGkG/mm)/mm)
y
PJ
y
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
PPyy LcLc tctc dngdng theotheo phngphng hnghng knhknh caca bb
mtmt giagia cngcng
((kNkN hayhay kGkG))
yy LngLng dchdch chuynchuyn caca mimi daodao theotheo phngphng
tctc dngdng caca lclc
PPyy (mm)(mm)
PPyy vv yy SS giagia caca lclc tctc dngdng vv caca lclc dchdch
chuynchuyn (hay(hay
binbin dngdng))
6666
y
PJ
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
cng vng ca h thng cng ngh
mmmm dodo caca hh thngthng cngcng nghngh cc xcxc nhnh theotheo
cngcng
thcthc sausau ::
mmmm dodo (m/(m/kNkN hochoc mm/mm/kGkG)) ;;
yP
y
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
PyPy LcLc tctc dngdng ((kNkN hochoc kGkG))..
JJ cngcng vngvng..
6767
J
l
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Bin dng tip xc ca ca cc b mt lp ghp
PhPh thucthuc nhmnhm,, sngsng,, saisai ss hnhhnh dngdng hnhhnh
hchc,, tnhtnh chtcht
nn hihi caca vtvt liuliu tiptip xcxc,, cc tnhtnh titi trngtrng
caca bb mtmt tiptip xcxc,,
iuiu kinkin bibi trntrn
cngcng vngvng tiptip xcxc xcxc nhnh theotheo cngcng thcthc
==
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
-- cngcng vngvng tiptip xcxc (N/mm(N/mm33 ))
qq -- pp lclc ringring (N/mm(N/mm22))
yy -- binbin dngdng (mm)(mm)
Bin dng ca bn thn chi tit
BinBin dngdng koko,, binbin dngdng nnnn,, binbin dngdng unun,,
binbin dngdng xonxon hochoc
tngtng hphp cccc binbin dngdng
cc tnhtnh theotheo cccc cngcng thcthc caca scsc bnbn vtvt liuliu
hochoc theotheo ll
thuytthuyt nn hihi..
6868
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Bin dng ca bn thn chi tit
KhiKhi tintin trctrc trntrn cc chngchng tmtm haihai uu,, vngvng
caca chichi tittit cc thth
cc tnhtnh theotheo xx tt trntrn haihai gigi ..
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
vngvng yy caca chichi tittit cc gigi trtr lnln nhtnht khikhi
daodao nmnm trctrc ::
vngvng yy btbt kk vv trtr nono caca chichi tittit
6969
EI
LPy
y
48
3
L
xLx
EI
Py
y22 )(
.3
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
3
48
L
EI
y
PJ
y
Bin dng n hi ca h thng cng ngh
Bin dng ca bn thn chi tit
KhiKhi daodao nmnm giagia trctrc thth cngcng vngvng caca trctrc
ss ll::
KhiKhi daodao nmnm vv trtr cchcch mtmt uu bnbn tritri caca
chichi tittit mtmt khongkhong xx
thth cngcng vngvng caca chichi tittit
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
7070
LL ChiuChiu didi caca chichi tittit (mm)(mm);;
EE MunMun nn hihi;;
II MunMun qunqun tnhtnh caca tittit dindin chichi tittit..
ChiChi tittit cc tittit dindin trntrn thth
II == 00..0505DD44:: DD ll ngng knhknh caca chichi tittit
xx khongkhong cchcch tnhtnh tt mtmt uu bnbn tritri caca
trctrc..
22 )(
3
xLx
EILJ
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Bin dng ca bn thn chi tit
KhiKhi tintin mtmt uu trntrn mmmm cpcp vv mtmt uu chngchng
tmtm
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
vngvng yy caca chichi tittit cc gigi trtr lnln nhtnht ::
cngcng vngvng caca chichi tittit ss ll
7171
EI
LPy
y
102
3
3
102
L
EIJ
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Bin dng ca bn thn chi tit
BinBin dngdng caca bnbn thnthn chichi tittit cc tnhtnh theotheo
cccc cngcng thcthc caca
scsc bnbn vtvt liuliu hochoc theotheo ll thuytthuyt nn
hihi..
KhiKhi tintin trctrc trntrn cc kpkp mtmt uu ((kpkp cngxncngxn))
trntrn mmmm cpcp
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
vngvng yy caca chichi tittit cc gigi trtr lnln nhtnht ::
cngcng vngvng caca chichi tittit ss ll
7272
EI
LPy
y
3
3
3
3
L
EIJ
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
nh hng do sai s ca phi
HinHin tngtng inin dpdp saisai ss hnhhnh dngdng hnhhnh hchc
cngcng vivi tnhtnh chtcht caca
phiphi vv chichi tittit giagia cngcng
vanvan,, cncn,, oo
GiGi ss phiphi cc vanvan caca phiphi phph::
KhiKhi tintin tinhtinh hochoc bnbn tinhtinh,, chichi tittit
cngcng cc saisai ss tngtng tt
minmaxphphph DD
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
GiGi tt ss ll hh ss chnhchnh xcxc hoho::
KK ll hh ss gimgim saisai ((hh ss inin dpdp))::
7373
minmaxctctct DD
ct
ph
ph
ctK
kch thuc khi iu chnh
max
minmin
D
Dphminct
t
ymint
max
yDD
max
max
ph
ct
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
nh hng do sai s ca phi
NuNu ququ trnhtrnh giagia cngcng gmgm nn lnln chychy daodao vivi
cccc hh ss KK11,, KK22KKnn
thth hh ss gimgim saisai tngtng cngcng KK
MunMun tt chnhchnh xcxc thth phnphn rara nhiunhiu lnln ctct
TrongTrong thcthc tt khikhi thitthit kk quiqui trnhtrnh cngcng
nghngh cncn chch nn quiqui lutlut
KKKK n...21.
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
TrongTrong thcthc tt khikhi thitthit kk quiqui trnhtrnh cngcng
nghngh cncn chch nn quiqui lutlut
sausau::
NnNn tt gigi trtr KK nhnh ngayngay tt nhngnhng nguynnguyn cngcng
thth banban uu
mm bobo tnhtnh kinhkinh tt
7474
KKK n ...21
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php tnh ton
xcxc nhnh cngcng vngvng caca hh thngthng cngcng nghngh cncn
phiphi xcxc
nhnh lnglng chuynchuyn vv tngtng ii giagia mimi daodao vv chichi
tittit giagia cngcng
didi tctc dngdng caca lclc ctct cc nhnh..
BinBin dngdng tngtng hphp yy cc tnhtnh theotheo cngcng
thcthc::
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
mmmm dodo caca hh thngthng cc tnhtnh theotheo cngcng
thcthc::
yy11 ,, yy22 ...... yynn -- BinBin dngdng caca cccc khukhu
thnhthnh phnphn
JJ11,, JJ22,, JJ33,, JJ44......JJnn -- cngcng vngvng caca cccc
khukhu thnhthnh phnphn;;
JJ -- cngcng vngvng caca hh thngthng
7575
nyyyyyy ...4321
n ...4321
nJJJJJJ
111111
4321
...
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php tnh ton V d: Khi tin trc trn chng tm hai u
XtXt thnhthnh phnphn lclc ctct PPyy khikhi daodao didi
chuynchuyn tt sausau vv trctrc
BinBin dngdng nn hihi caca sausau yy22 binbin ii theotheo ngng
thngthng BC,BC,
BinBin dngdng nn hihi caca trctrc yy11 binbin ii theotheo ngng
thngthng EDED..
vngvng (( un)un) caca ngng tmtm chichi tittit didi tctc dngdng
caca lclc PPyy cc
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
biubiu dindin bngbng ngng ntnt tt..
NhNh vy,vy, tttt cc binbin dngdng caca hh thngthng cngcng nghngh
lmlm chocho kchkch thcthc
caca ngng knhknh tngtng lnln soso vivi kchkch thcthc iuiu
chnhchnh.. TuyTuy nhin,nhin, kchkch
thcthc caca chichi tittit giagia cngcng thaythay ii theotheo
chiuchiu didi..
7676
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php tnh ton V d: Khi tin trc trn chng tm hai u
mtmt vv trtr AAAA nono ,, ngng knhknh thcthc ddt(At(AA)A)caca
chichi tittit giagia cngcng
ss bngbng::
E
B
yct
A
)(2 )()()(2)(1)( AActAAdAAAAcAAt yyyydd
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
7777
yd
A
c
Py
A-AA-AA-A
21ctyyy
D
y1
y2
B
dc ng knh iu chnh;dt(AA) ng knh thc ca chi tit ti v tr AA;y1(AA)
bin dng ca trc ti v tr AA;
y2(AA) bin dng ca sau ti v tr AA;yd(AA) bin dng ca mi dao ti v
tr AA;yct(A_A) bin dng ca chi tit ti v tr AA;
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php tnh ton. V d: Khi tin trc trn chng tm hai u
XtXt trngtrng hphp khikhi daodao nmnm imim giagia caca chichi
tittit giagia cngcng..
BnBn thnthn chichi tittit giagia cngcng cc xemxem ll cc cngcng
vngvng tuyttuyt ii..
BinBin ii caca ngng knhknh chichi tittit ss chuchu nhnh hnghng
nn hihi caca
trc,trc, sausau vv caca bnbn xexe daodao.. CcCc gigi trtr caca
binbin dngdng nn hihi
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
cc tnhtnh nhnh sausau::
7878
bd
y
bdJ
Py
1
12J
Py
y
2
22J
Py y
ybd bin dng n hi ca bn xe dao;y1 bin dng n hi ca bn trc;y2 bin
dng n hi ca bn sau;Jbd cng vng ca bn xe dao;J1 cng vng ca trc;J2
cng vng ca sau;Py thnh phn lc hng knh (bn xe dao chu tc dng ca ton
b
thnh phn lc Py, cn trc v sau ch chu tc dng ca Py/2).
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php tnh ton V d: Khi tin trc trn chng tm hai u
TngTng binbin dngdng caca trctrc vv sausau vv trtr imim giagia
caca chichi tittit
ss ll::
NhNh vy,vy, binbin dngdng caca mymy yymm cc tnhtnh nhnh
sausau::
2121
21
11
4222
1
JJ
P
J
P
J
Pyyy yyyo
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
mm
TaTa aa rara khikhi nimnim cngcng vngvng caca mymy JJmm ,, cc
quanquan hh vivi
binbin dngdng caca mymy yymm nhnh sausau::
CnCn bngbng haihai phngphng trnhtrnh tata cc ::
7979
2
11
4 1 JJ
P
J
Py
y
bd
y
m
m
y
mJ
Py
21
11
4
111
JJJJ bdm
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php thc nghim - cng vng tnh
cngcng vngvng tnhtnh cc xcxc nhnh khikhi gg chichi tittit trntrn
mymy trngtrng
thithi tnhtnh ((trngtrng thithi khngkhng lmlm vicvic))..
SS nguynnguyn ll xcxc nhnh cngcng vngvng tnhtnh caca cccc bb
phnphn caca
trctrc chnhchnh mymy trngtrng thithi tnhtnh..
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
8080
P
2
1
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php thc nghim - cng vng tnh
TiTi trngtrng PP cc tngtng dndn vv dngdng ngng hh soso 22 xcxc
nhnh lnglng
binbin dngdng nn hihi caca trctrc chnhchnh 11.. LcLc PP tngtng
dndn tt 00 nn mtmt gigi
trtr cccc ii nono (ph(ph thucthuc vovo loiloi vv kchkch thcthc
caca my)my)..
SauSau khikhi lclc PP tt gigi trtr cccc ii thth nn gimgim dndn
vv dngdng ngng hh soso
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
22 xcxc nhnh lnglng binbin dngdng tngtng ngng..
KhiKhi tngtng vv gimgim lclc P,P, thth quanquan hh giagia binbin
dngdng yy vv lclc PP ::
Y=Y= f(P)f(P) cc xyxy dngdng trntrn hnhhnh
8181
80
20
400300100 200 500 (KG)P
40
60
100y (m)
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php thc nghim - cng vng ng
PhngPhng phpphp xcxc nhnh cngcng vngvng ngng ((khikhi mymy lmlm
vicvic)) chocho
phpphp nhnh gigi cngcng vngvng caca mymy chnhchnh xcxc hnhn
phngphng phpphp
xcxc nhnh cngcng vngvng tnhtnh (khi(khi mymy chacha
lmvic)lmvic)
TnhTnh tonton chnhchnh xcxc theotheo cngcng vngvng tnhtnh lmlm
chocho saisai ss giagia
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
cngcng gim,gim, chocho nnnn chnhchnh xcxc giagia cngcng caocao
cc tnhtnh tonton theotheo
cngcng vngvng ngng cncn cngcng vngvng tnhtnh cc thth cc
dngdng
kimkim tratra cngcng vngvng caca cccc mymy mimi
8282
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php thc nghim - cng vng ng
D2
t1
D1
t2a)
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
8383
t2
t1
p
t1t2
b)
c)
Xc nh cng vng ng (khi gia cng vi chiu su ct thay i)a,b tin phi
bc v phi lch tm; c phay mt phng bc bng dao phay mt u.
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php thc nghim - cng vng ng
xcxc nhnh cngcng vngvng ngng (trn(trn mymy giagia cng)cng) tata
giagia cngcng
trctrc bcbc hochoc trctrc lchlch tmtm trongtrong trngtrng hphp
nyny phiphi phiphi cc
cngcng vngvng caocao (cao(cao hnhn cngcng vngvng caca mymy 5566
ln)ln) loiloi trtr
nhnh hnghng caca mymy titi chnhchnh xcxc giagia cngcng..
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
KhiKhi daodao chuynchuyn tt bcbc nyny sangsang bcbc khc,khc,
chiuchiu susu ctct vv binbin
dngdng nn hihi caca hh thngthng cngcng nghngh thaythay i,i, vv
vyvy xyxy rara hinhin
tngtng inin dpdp caca cccc onon bcbc nhngnhng vivi gigi trtr
nhnh hnhn.. HinHin
tngtng inin dpdp saisai ss uu vovo ll cc ss xcxc nhnh cngcng
vngvng
ngng..
8484
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php thc nghim - cng vng ng
TheoTheo nguynnguyn ll ctct kimkim loiloi thth thnhthnh phnphn
lclc hnghng knhknh cc
xcxc nhnh theotheo cngcng thcthc
LngLng binbin dngdng caca bb phnphn mymy khikhi giagia cngcng
bcbc thth ii ::
pp yx
py StCP ...
. iyxi pp StCPy
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
HiuHiu cccc binbin dngdng khikhi giagia cngcng cccc bcbc kk
nhaunhau vivi lnglng chychy
daodao khngkhng ii ss ll ::
phph saisai ss caca phiphi (chiu(chiu caocao caca bc)bc)..
ctct saisai ss caca chichi tittit (lng(lng inin dpdp caca
chiuchiu caocao bc)bc)..
8585
10001000. ip
iyi StCPy
ppp xixiypii ttSCyy 111000
ph
x
i
x pp tt 1
ctii yy 1
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Xc nh cng vng ca h thng cng ngh bng phng
php thc nghim - cng vng ng
TT tata xcxc nhnh mmmm dodo nhnh sausau::
TT ss giagia ll hh ss chnhchnh xcxc ho,ho, chocho nnnn mmmm dodo
ii ss ll
ph
cty
p
ipSC
1000
ph
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
ii
NhNh vy,vy, cngcng vngvng caca mymy::
8686
..
1000py
p
iSC
py
p
i
SCJ 1000
ct
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
Bin dng n hi ca h thng cng ngh
Cc phng php nng cao cng vng ca h thng cng
ngh
TngTng cngcng vngvng caca tngtng khukhu trongtrong hh thngthng
cngcng nghngh bngbng
cchcch chnchn kchkch thcthc vv hnhhnh dngdng hphp ll,, chnchn
vtvt liuliu vv phngphng
phpphp nhitnhit luynluyn hphp ll..
TngTng cngcng vngvng tiptip xcxc bngbng cchcch gimgim nhmnhm vv
sngsng
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
bb mtmt ngng thithi toto cngcng ((trongtrong mimi ghpghp lplp
lnglng)) hphp ll..
GimGim ss khukhu trongtrong hh thngthng cngcng nghngh,, bibi vv
nhnh tata bitbit::
mmmm dodo caca hh thngthng cngcng nghngh ll tngtng mmmm dodo
caca cccc
khukhu thnhthnh phnphn..
SS dngdng cccc cc cucu lmlm tngtng cngcng caca tonton bb hh
thngthng nhnh
cccc chtcht tt vv cccc luynetluynet iuiu chnhchnh hochoc trctrc
iuiu chnhchnh..
8787
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca chnh xc ca my ti sai s gia cng
V d 1: ng tm ca trc chnh my tin khng song song
vi sng trt ca thn my trong mt phng nm ngang
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
ngng knhknh lnln nhtnht caca chichi tittit DDmaxmax cc tnhtnh
nhnh sausau::
aa -- khngkhng songsong songsong trntrn chiuchiu didi LL
trongtrong mtmt phngphng nmnm ngangngang
8888
aDD
22max
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca chnh xc ca my ti sai s gia cng
V d 2: Sng trt khng song song vi ng tm ca trc
chnh trong mt phng ng
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
ngng knhknh lnln nhtnht caca chichi tittit DDmaxmax cc tnhtnh
nhnh sausau::
bb -- khngkhng songsong songsong trongtrong mtmt phngphng ngng
trntrn chiuchiu didi LL
8989
4
22
max
dbD
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca chnh xc ca my ti sai s gia cng
V d 3: Sng trt khng thng trn mt phng nm ngang th
qu o chuyn ng ca mi dao khng thng
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
ngng knhknh DD titi mtmt vv trtr nono bngbng
DD -- ngng knhknh caca chichi tittit tittit dindin mm sngsng
trttrt trngtrng vivi vv trtr
ngng theotheo tnhtnh tonton;;
-- lnglng dchdch chuynchuyn lnln nhtnht caca sngsng trttrt
trntrn mtmt phngphng nmnm
ngangngang soso vivi vv trtr tnhtnh tonton..9090
2' DD
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca chnh xc ca my ti sai s gia cng
V d 6: Trn my phay ng, trc chnh ca my khng thng
gc vi bn my theo phng ngang ca bn my
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
9191
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca chnh xc ca my ti sai s gia cng
V d 5: Trn my phay ng, trc chnh my phay khng vung
gc vi bn my theo phng dc
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
9292
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca sai s ca g ti chnh xc ca gia
cng
Sai s ch to v lp rp ca g cng nh hng ti
chnh xc ca chi tit gia cng.
CcCc chichi tittit quanquan trngtrng caca gg nunu cc saisai ss
dodo chch toto hochoc
mnmn ss lmlm thaythay ii vv trtr tngtng ii giagia mymy daodao
chichi tittit,, dodo
cngcng gygy rara saisai ss giagia cngcng..
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
cngcng gygy rara saisai ss giagia cngcng..
SaiSai ss dodo lplp rprp gg lnln mymy cngcng gygy rara saisai ss
giagia cngcng vv nn
lmlm mtmt vv trtr chnhchnh xcxc caca gg soso vivi dngdng cc
ctct..
m bo chnh xc gia cng th chnh xc ca g
c ch to ra phi cao hn t nht l mt cp so vi chnh
xc ca kch thc gia cng.
9393
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca sai s ca dng c ct ti chnh xc gia
cng
chnh xc ch to dng c ct v g t trn my u nh
hng dn chnh xc gia cng.
KhiKhi giagia cngcng bngbng cccc dngdng cc nhnh kchkch thcthc
thth saisai ss caca
chngchng nhnh hnghng trctrc tiptip nn chnhchnh xcxc giagia
cngcng..
KhiKhi giagia cngcng rnhrnh thenthen bngbng daodao phayphay
ngnngn,, daodao phayphay aa thth saisai ss
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
KhiKhi giagia cngcng rnhrnh thenthen bngbng daodao phayphay
ngnngn,, daodao phayphay aa thth saisai ss
ngng knhknh vv bb rngrng caca daodao cngcng nhnh hnghng trctrc
tiptip nn
chnhchnh xcxc chiuchiu rngrng caca rnhrnh thenthen..
KhiKhi giagia cngcng cccc bb mtmt nhnh hnhhnh bngbng daodao nhnh
hnhhnh nhnh daodao tintin
nhnh hnhhnh,, daodao phayphay modunmodun,, saisai ss
profinprofin ss lmlm saisai dngdng bb mtmt
giagia cngcng
9494
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca sai s ca dng c ct ti chnh xc gia
cng
Trong qu trnh ct, dao b mn s lm nh hng n chnh
xc gia cng
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
mnmn mtmt sausau hh cc nhnh hnghng lnln nhtnht titi kchkch
thcthc giagia cngcng..
MiMi daodao bb lili rara khikhi chichi tittit mtmt lnglng ll
uu
KhiKhi giagia cngcng trctrc di,di, mnmn ss gygy rara saisai ss
hnhhnh dngdng hnhhnh hc,hc,
KhiKhi giagia cngcng trctrc ngnngn thth mnmn ss gygy rara saisai
ss kchkch thcthc chocho
cc lotlot
9595
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca bin dng ca my ti chnh xc gia
cng
Khi my lm vic, cc b phn khc nhau ca my b nung nng
ch yu l do nhit ma st, nhit pht ra t ng c v t h
thng thu lc.
Nhit ca cc b phn khc nhau ca h thng cng khc
nhau (chnh nhau t 1050) chnh xc gia cng
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
nhau (chnh nhau t 1050) chnh xc gia cng
Bin dng nhit ca my nh hng n kch thc v hnh
dng ca chi tit gia cng
9696
-
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
in
C
Kh,
H
BK
HN
3.4 CC NGUYN NHN GY RA SAI S GIA CNG 3.4 CC NGUYN NHN GY RA SAI
S GIA CNG
nh hng ca bin dng ca my ti chnh xc gia
cng
Bin dng nhit theo phng ngang ca trc s gy ra sai
s ng knh
Khi gia cng chi tit ln c th gy ra sai s hnh dng hnh hc
m)
ThS
. P
hn
g X
un
La
n, B
m C
NC
TM
, V
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