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है”ह”ह

IS 14877-2 (2002): Hydraulic Presses - Straight SidedColumns/C-Frame Type, Part 2: Test Chart for Technical(Performance) Evaluation of Presses and Press Brakes [PGD4: Metal Forming Machines]

IS 14877 (Part 2): 2002

wm9v7m-

Indian Standard

HYDRAULIC PRESSES — STRAIGHT SIDEDCOLUMN/C-FRAME TYPE

PART 2 TEST CHART FOR TECHNICAL (PERFORMANCE)EVALUATION OF PRESSES AND PRESS BRAKES

ICS 25,120.10

0 BIS 2002

BUREAU OF IN DIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARC

NEW DELHI 110002

>

May 2002

I

Price Group 2

Metal-Forming Machines Sectional Committee, BP 04

j=

FOREWORD

This Indian Standard (Part 2) was adopted by the Bureau of Indian Standards, after the draft finalized by theMetal-Forming Machines Sectional Committee had been approved by the Basic and Production EngineeringDivision Council.

This standard has been formulated based on manufacturing practices followed by manufacturers of presses inIndia.

The other part of this standard is:

1S 14877 (Part 1) :2000 Hydraulic presses — Straight sided column/C-frame type: Part 1 Test chartfor geometrical accuracy

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS 2:1960 ‘Rulesfor rounding off numerical values (revised)’. The number of significant places retained in the rounded off valueshould be the same as that of the specified value in this standard.

IS 14877 (Part 2): 2002

Indian Standard

HYDRAULIC PRESSES — STRAIGHT SIDEDCOLUMN/C-FRAME TYPE

PART 2 TEST CHART FOR TECHNICAL (PERFORMANCE)EVALUATION OF PRESSES AND PRESS BRAKES

1 SCOPE

1.1 This standard (Part 2) lays down guidelines forperformance testing and technical evaluation forhydraulic presses and hydraulic press brakes.

1.2 It also deals with testing of the running of the press— such as vibrations, noise, etc, and also verificationof the specification of the press.

2 REFERENCE

The following standard contains provisions which,through reference in this text, constitutes provision ofthis standard, At the time of publication, the editionindicated was valid. The standard is subject torevision, and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent edition of the standardindicated below:

Is No. Title

14877 Hydraulic presses — Straight sided(Part 1): 2000 column/C-frame type : Part 1 Test

chart for geometrical accuracy

3 DIMENSIONS

The dimensional deviation of various slidemovements of presses shall be as follows:

S1 Test Item AllowableNo. Deviation,

Percent

1. Maximum stroke of slide (mm) +10o

2. Maximum distance from upper”face +10of bolster to lower face of slide (mm) O

3. Maximum distance from upper face of +10the bed to the lower face of the oslide (mm)

4 MEASURING INSTRUMENTS

The measuring instruments shall be of approved typeand shall be conforming to the relevant IndianStandard. The measuring instruments are to beprovided by supplier.

5 TESTS

The performance evaluation consists of inspection ofvarious geometrical parameters on functional aspectsof the presses.

NOTES1 The sequenceofcarryingoutthe testsmaybe changedtosuiteaseof mountingof measuringandtestingequipments.2 It is not obligatory on the part of supplier to give theproductiontrialunlessthebuyerspecifiesitalongwiththeorder.3 Full load trial on test blocks shall be performed by thesupplier.

5.1 Geometrical Tests

Before conducting any performance test, allgeometrical tests shall be completed according toIS 14877 (Part 1) and the machine level is not disturlxd.If required, necessary anchorage maybe provided.

5.2 Performance Test

The performance test comprises of the following:

a) Function test,b) No load running test, andc) Running test with load.

5.2.1 Such tests shall be carried out at supplier’spremises. In case, few tests can not be performed atsuppliers’ premises, the same shall be demonstrated atcustomer’s premises by any suitable means as peragreement between supplier and customer.

5.2.2 Function Test

During the function test, the hydraulic presses and/orhydraulic press brakes with necessary auxiliaries andthe systems shall be run and the smoothness of action.The reliability of function shall be tested in accordancewith the following method as applicable to them:

sl Oper&tion Procedure

No.

1. Press starting Execute the starting andand stopping stopping operations three

times consecutively to test thesmoothness and reliability ofaction.

2. Slide running Execute the runningoperation three times

1

S1 OperationNo.

3. Slide velocityadjustment

4. Slide pressureadjustment

5. Slide strokeadjustment

6. Slide strokeadjustmentindicator

7. Stroke-counter

8. Moving bolster

9. Automatic dieclamp

10. Die cushion/ejector

11. Material feedmechanism, ifapplicable

12. Product feedmechanism, ifapplicable

13. Safety devices

14. Secondary safety

15. Oil pump/grease pumppressure switch

Procedure

minimum consecutively totest the smoothness andreliability of action.

Execute the velocityadjusting operations forminimum and maximumvelocity to test t hesmoothness and reliability ofaction for minimum twotimes.

Execute the pressureadjusting operation forminimum and maximumsettings,

Execute the adjustmentoperation for maximumstroke to test the smoothnessand reliability of action.

Test the accuracyindication.

Test the accuracyindication.

Test the smoothnessreliability of action.

Test the smoothnessreliability of action.

Test the smoothnessreliability of action.

Test the smoothnessreliability of action.

Test the smoothnessreliability of action.

Test the safety of parts

of

of

and

and

and

and

and

suchas gate, guard, sweep guard,pull back guard, two handlever, two hand button andlight beam type safetydevices with regard to theoperator,

Test the safety of parts suchas restarting preventionmechanism, “slide dropprevention, mechanism,emergency stop button,warning lamps, buzzer andready-to-start button withrespect to the operators.

Test the reliability of function

S1 OperationNo.

16. Oil/greasesupply

17. Oil tightness

18. Pneumaticitems such asfilter regulator,pressure gauge,waterseparators, etc

19. Pressure switch

20. Air tightness

21. Pressure gauge

22. Liquid tightness

23. Oil pressureregulatingvalves forover-load safetyfunction

24. Other overloadpreventiondevice

25. Electrical device

Procedure

Test the efficiency of lubricationto all concerned parts

Test the oil tightness of thesliding parts and rotatingparts.

Test the reliability offunction.

Test the reliability of function.

Test the reliability of function.

Test the reliability of function.

Test the reliability of function.

Measure the operatingpressure at least three timesand verify that it is within120 percent of the maximumworking pressure.

Test the reliability of machineprotection

Test the insulation oncebefore and after the runningtest.

NOTES1 Runningoperationsreferto interruptedsinglestrokerunning,continuous running, continuous limited time running, inchingand stopping according to its applicability.2 Safety requirements for hydraulic pressesshall be mutuallyagreed between the purchaser and the supplier.

5.2.3 No LQad Running Test

5.2.3.1 No load test shall be conducted by executinginterrupted single stroke running for minimum 500strokes and continuous running of the press forminimum 4 hat maximum stroke with no load to checkits electrical power requirement, temperature changeand running conditions.

Measurement shall be taken only when thetemperature shown by the temperature indicatorremains in equilibrium.

Measurement shall also be for the initial descentduring emergency stopping of the slide.

5.2.3.2 During no load test, measurement for thefollowing shall be made after every one hour intervalfo-nlisting as per 5.2.3.1 above.

a) Working velocity of slide maximum andminimum.

b) Electric power required by main motor duringthe pressing.

2

. A

c) Temperature of running parts mainly1) Motor driving the press at casing and

bearings2) Pump3) Slide face4) Operating liquid media inthe oil tank

d) Air tightness — Test the reliability of function.e) Liquid tightness — Test the reliability of func-

tion.f) Vibration measurement*)g) Noise measurement)

NOTE — The values of temperature, vibration and noise levelsshall be as agreed between the manufacturer and the purchaser,

5.2.4 Running Test with Load

5.2.4.1 Load test shall be conducted by continuouslyrunning at maximum working pressure to check itstemperature change and running conditions. Thetemperature at the measuring site shall be maintainedconstant during the test.

This test shall be conducted with respect to severalcombination of the slide stroke as given in 3.

5.2.4.2 During load test measurement for thefollowing shall be made:

a)

b)

c)

d)

e)

f)

Temperature of casing and bearing of mainmotor driving the press and the operatingliquid in the tank.Air tightness test for the reliability of opera-tion.Liquid tightness test for the reliability ofoperation.Vibration measurement according to relevantIndian StandardsNoise measurement according to relevantIndian StandardsThe duration of pressure application shall bereported as the time taken to ‘tie slide to travelhalf of the maximum stroke at pressingvelocity as given in relevant Indian Standardsand should be recorded as the following table:

IS 14877 (Part 2) :2002

6 TECHNICAL (PERFORMANCE) EVALUA-TION OF HYDRAULIC PRESSES ANDHYDRAULIC PRESS BRAKES

6.1 The performance evaluation consists ofinspection and testing of various geometricalparameters of the press for its reliability andefficiency. The procedure adopted may be changedby the supplier to suit the requirements of the press.The evaluation is only guideline for supplier and heshall ensure that the press meets the specification ofcustomer.

6.2 During evaluation of hydraulic press/hydraulicpress brakes following checks shall be made:

sl DescriptionNo.

1, Bed fabrication

1.1 Flatnesstolerance

1.2 Parallelismtolerance withreference todatum:

2. Bolster2.1 Flatness

tolerance

3. Slide

3.1 Flatnesstolerance,movementtolerance

4. Hydraulicsystems

Check for

Top surface

Slide bottom surface

Cushion surface

Top surfaceBottom surfaceParallelism

Left to right with respect tobolster or bed

Front to back with respect tobolster or bed

Check for the hydraulicsystem pipes as per thecircuitCheck for pump suctionlines and the lines should beas short as possible withminimum bends

sl Time of Temperatare,°C Stroke Duration RemarksNo. Measurement (mm) of

h & min Main Motor Main Motor Operating Ambient PressureCasing Bearing Liquid Temperature Application

in Tank (s)

1 2 3 4 5 6 7 8 9

.

,

-----

‘)Indian standards under preparation.

3

IS 14877 (Part 2) :2002

. A——

sl DescriptionNo.

5. Safety interlocks

6. Check for pipejoints

7. Systemparameters

8. Noise level

9. Lubrication

10. Reliability ofhydraulic system

11. Reliability of

pumps ‘

Check for S1No.

Faulty lubrication/ machinelubrication faulty interlocksSystems safety interlocksPumps safety interlocksGuards interlocks Cushionsafety interlocks RUNbuttons interlocks Motoroverload interlocks

Leakage at joints

Leakages at pumping station

Leakage at manifoldassembly station

Leakage at cylinder ports

Leakage at gauge box station

Leakage at reservoir

Description Check for “

away from the pumpingstation (surroundingequipments and machineskeeping idle)

Leakage discharge, etc

Check for temperature ofpump at the end of 8 hours run

Check for pump motorcoupling alignment

Manifold blocks reliabilitycheck at various pressurecheck points for pressuresettings. The settingsshould remain same as beforethe commencement of 8hours run

Pressure setting on manifoldblocks

Specification of oil

Contamination level of oil

Direction of rotation ofpumps

Temperature of oil in powerpack

All hydraulic elements

12. Gauge box Check for pressure settings ofstation various pressure control

elements

Vary the pressure settingsfrom minimum/maximumand record the minimum andmaximum values

Check for provision forsetting minimum andmaximum and intermediate

Pressure drop in the system settings.

Measure noise level at Check for pressure

operators position by running consistent readings

under maximum pressure as Check for pressure

per Indian Standard. consistent readings

Shocks and vibration of the 7 GENEWL CHECKING

gauges

gauges

pipe lines during maximumpressure build up and 7.1 The following general checking shall also be

decompression as pe; IndianStandard

Check all lubrication pointsfor proper lubrication andinjectors to be set as per thelubrication chart.

Run the machinecontinuously for eight hourswithout interruption in aprogramme consisting of allmachine and systemfunctions as per programme

Check for pump noise levelunder full load measuringfrom a distance one meter

conducted:

a)b)

c)

d)

e)

f-)

Piping as per circuit diagram,Accessibility of hydraulic equipment andpiping and mounting or easy adjustment andmaintenance of equipment,Identification of all the elements and equip-ments with labels,Correctness of pump motor alignment aftercomplete assembly,Precision of proper clamping to all the pipes,Provision of dust seals to all the return andsuction lines at the reservoir top, andIdentification and marking of all piping as percircuit drawing.

Bureau of Indian Standards

131S is a statutory institution established under the Bureau of hfianharmonious development of the activities of standardization, markingand attending to connected matters in the country.

Copyright

i

\ .*?,,

+)

Standards Act, 1986 to promote ,*’

and quality certification of goods ,,,,’

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates thatno changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users

of’ Indian Standards shou}d ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of ‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No, BP 04 ( 0015 ).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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