Screw Compressor Rotor Training manual

Screw Compressor Ro-tor

Training manual

1. Part position ... ..………………………………………………… 2

2. Probe setup …………………………………………………… 3

3. Import nominal profile data……………………………………… 4

4. Create helical vector …………………………………………… 9

5. File structure …………………………………………………… 11

6. Screw compressor rotor‘s function ………………………… 12

7. Define Screw compressor rotor’s data ……………………… 13

8. Create PC-DMIS part program ……………………………… 26

9. Execute part program & evaluate dimension ……………… 27

10. Report analysis ……………………………………………… 29

Contents

3

1. Part position on the CMM Table– Rotation axis of the Screw Compressor= Z axis of the CMM. - Part rotation – any, prefferably use some references, like pictures

bellow

X

Y

X

Z

X

Z

X

Y

Female Male

4

2. Probe setup Stylus number is configured the same as the number of teeth of the part. Stylus No.1 = -X axis direction (not a must, but a good suggestion – see pictures bellow)

TIP1

TIP2

TIP3

TIP4

TIP5

TIP1

TIP2

TIP3

TIP4

XY

XY

Teeth = 5

Teeth = 4

5

3. Import nominal profile data 1) Import nominal profile from a text file. (X,Y Data)

X Y

Import text file

Name of Profile

6

3. Import nominal profile data 2.1) Import nominal profile from a 3D CAD model After you import the 3D CAD model from PC-DMIS using Linear_Open_Scan, generate an off-line scan to extract

nominal profile. Create the scan in CCW direction!

7

3. Import nominal profile data 2.2) Import nominal profile from a 3D CAD model Start CA and import the nominal profile generated in PC-DMIS.

8

3. Import nominal profile data 3) Adjust the data Change the Z value of the points to “0”. Check again the point flow – must be CCW!

9

Female Pro-file

Male Profile

10

4. Create helical vector

Length of Lead per pitch

Helix direc-tion

Probe radius compensa-tion(Generally ‘0’)

Probe R comp direc-tion

※ In case imported nominal profile from a 3D CAD model, there might be ni need of create he-lical vector.

11

Eventually show the vectors, to ensure yourself, they are created correctly.

12

5. File structure

C: ＼ CurveAnalyzer ＼ Scr-comp ＼ S/C rotor part data(spec) file

PC-DMIS Part program file

CurveAnalyzer Measured data file

C: ＼ CurveAnalyzer ＼ Scrcomp ＼” Name of S/C rotor part data”_Saved ＼

Backup files of CurveAnalyzer Measured data file※ C/A Measured file name + date & time

Backup folder of CurveAnalyzer Measured data files

CurveAnalyzer Measured data files

PC-DMIS Part program files

S/C rotor part data files

13

6. Screw compressor rotor’s function. CurveAnalyzer menu Measure -> Screw compressor rotors…

Create PC-DMIS Part pro-gramExecute part program & eval-uate

List of Part data files

Profile view (top face of S/C ro-tor)

Summary view part data

Evaluate current measure-mentCreate new part

Edit selected part

Delete selected part

Create copy of the current part

Manage backup – recall/deleteSetup measuring and evalu-ation parameters

14

7. Define Screw compressor rotor’s data. CurveAnalyzer menu Measure -> Screw compressor rotors… -> New

15

7. Define Screw compressor rotor’s data 1) Define generally geometry data - Female

Part’s ID or NameSelect nominal pro-file

Tooth width of S/C ro-tor(Z axis direction)Length of lead

Choose two points of the nomi-nal profile for set the rotate axis

16

7. Define Screw compressor rotor’s data 1) Define generally geometry data - Male

Part’s ID or NameSelect nominal pro-file

Tooth width of S/C ro-tor(Z axis direction)Length of lead

Choose two points of the nomi-nal profile for set the rotate axis

17

7. Define Screw compressor rotor’s data 1) Define generally geometry data – Profile view mode

Click right mouse but-ton

Section profile view

Top face full pro-file

Rotate profile

Adjust the top face of the actual part, as it will be placed on the CMM, and the like, click left mouse button.

※ ㅣ = Lead

The highlighting is No.1 of pro-files Counter clockwise 2,3,4…

18

7. Define Screw compressor rotor’s data 2) Measurement configuration

Safety distance of part around

Z axis safety height from top face

Probe approach distance for align-ment

Probe approach distance for measure-ment

Currently probe name & shape

19

7. Define Screw compressor rotor’s data 2) Measurement configuration – Probe setup

Name of probe(As in PC-DMIS!)

Stylus num-bers

Direction of No.1 tip

Diameter of stylus

If you use a index probe head.Changes in the following format.=> T1A90B-90

20

7. Define Screw compressor rotor’s data 3) Alignment setup

Auto vector pointDefined scanUnknown scan

Upper diame-ter

Lower diame-ter

Cylin

der

heig

htCy

linde

r he

ight

Z Po

si-tio

nZ

Posi-

tion

Setup alignment location & range

21

7. Define Screw compressor rotor’s data 3) Profile measurement setup - Female

Profile form toler-anceRef. Is NominalRef. Is Measured

Profile & probe view for mea-surement height. Check if OK! Eventually change Z position!

All = Full profile mea-surement1 = No.1 profile mea-surement

Auto vector pointDefined scanUnknown scan

22

7. Define Screw compressor rotor’s data 3) Profile measurement setup - Male

Profile form toler-anceRef. Is NominalRef. Is Measured

All = Full profile mea-surement1 = No.1 profile mea-surement

Profile & probe view of mea-surement height

Auto vector pointDefined scanUnknown scan

23

7. Define Screw compressor rotor’s data 4) Lead measurement setup - Female

Lead total form tolerance

Lead measurement location view

All = Full lead measure-ment1 = No.1 lead measure-ment

Auto vector pointDefined scanUnknown scan

Point number of nominal pro-file for Flank 1 measurement

Same as the rotate axis points

Point number of nominal pro-file for Flank 2 measurement

Flank 1

Flank 2

24

7. Define Screw compressor rotor’s data 4) Lead measurement setup - Male

Lead total form tolerance

All = Full lead measure-ment1 = No.1 lead measure-ment

Lead measurement location view

Auto vector pointDefined scanUnknown scan

Point number of nominal pro-file for Flank 1 measurement

Point number of nominal pro-file for Flank 2 measurement

25

7. Define Screw compressor rotor’s data 4) Lead measurement setup – Graphic display mode

Radial PositionFlank 1 TipsFlank 2 Tips

Scanning rage view of Flank 1

Adjust scanning range of Flank 1Default = 0

Scanning rage view of Flank 2

Adjust scanning range of Flank 2Default = 0

26

7. Define Screw compressor rotor’s data 5) Pitch measurement setup

27

8. Create PC-DMIS part program. CurveAnalyzer menu Keep PC-DMIS opened, but with no PP opened. Then : Measure -> Screw compressor rotors… -> Generate PC-DMIS PP

※Before click PC-DMIS PP buttonExecuted PC-DMIS.

28

9. Execute part program & evaluate dimension . CurveAnalyzer menu Measure -> Screw compressor rotors… -> Measure & Evaluate

Part information & com-ment

29

9. Execute part program & evaluate dimension. PreAlignment – Manual measuring

1. Top face, 3point probing. (use Tip1)

※In the case of first-run part program, set slow speed of Jog-box.

2. Outer diameter of top face, 3point probing. (use Tip1)

30

10. Report analysis Female – Individual Profile & Lead Error

Profile form er-ror

Lead form error

Lead total form er-ror

Lead slope er-rorLead evalu-

ate location

Lead length error

Profile evaluate loca-tion

31

10. Report analysis . Female – Full Profile , Lead , Pitch Error

Profile form error

Total form error of a lead

RUNOUT of Ext diaRUNOUT of Int dia

Average lead length of total Flank1

Total form error of full leads

Individual Pitch er-rorAdjacent Pitch er-ror

Cummulative Pitch er-ror

32

10. Report analysis . Female – Full Profile Error

Profile Total form error

RUNOUT of Ext diaRUNOUT of Int dia

Profile ＋ dir form errorProfile － dir form error

Profile － dir out of toler-ance

Profile ＋ dir out of toler-ance

33

10. Report analysis . Female – Full Lead Error

Lead form errorLead slope error

Lead total form er-ror

Lead length error

34

10. Report analysis . Male - Report