BS ISO 10791-10-2007 Test conditions for machining centres - Evaluation of thermal distortions《机械加工中心的试验条件 热变形的评定》.pdf

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1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58distortionsICS 25.040.10Test conditions for machining centres Part 10: Evaluation of thermal BRITIS

2、H STANDARDBS ISO 10791-10:2007BS ISO 10791-10:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2007 BSI 2007ISBN 978 0 580 50420 4Amendments issued since publicationAmd. No. Date Commentscontract. Users are responsible for its cor

3、rect application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of ISO 10791-10:2007. The UK participation in its preparation was entrusted to Technical Committee MTE/1, Machine

4、 tools.A list of organizations represented on MTE/1 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a INTERNATIONALSTANDARDISO10791-10First edition2007-03-01Reference numberISO 10791-10:2007(E)Test conditions for machining cent

5、res Part 10:Evaluation of thermal distortionsConditions dessai des centres dusinage Partie 10: valuation des dformations thermiquesBS ISO 10791-10:2007iiiiiForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies(ISO member bodies). The

6、work of preparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governme

7、ntal, in liaison with ISO, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main

8、 task of technical committees is to prepare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casting a vote.Attenti

9、on is drawn to the possibility that some of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 10791-10 was prepared by Technical Committee ISO/TC 39, Machine tools, Subcommittee SC 2, Testconditions f

10、or metal cutting machine tools.ISO 10791 consists of the following parts, under the general title Test conditions for machining centres: Part 1: Geometric tests for machines with horizontal spindle and with accessory heads (horizontal Z-axis) Part 2: Geometric tests for machines with vertical spindl

11、e or universal heads with vertical primary rotaryaxis (vertical Z-axis) Part 3: Geometric tests for machines with integral indexable or continuous universal heads (vertical Z -axis) Part 4: Accuracy and repeatability of positioning of linear and rotary axes Part 5: Accuracy and repeatability of posi

12、tioning of work-holding pallets Part 6: Accuracy of feeds, speeds and interpolations Part 7: Accuracy of a finished test piece Part 8: Evaluation of contouring performance in the three coordinate planes Part 9: Evaluation of the operating times of tool change and pallet change Part 10: Evaluation of

13、 thermal distortionsBS ISO 10791-10:2007ivIntroductionA machining centre is a numerically controlled machine tool capable of performing multiple machiningoperations, including milling, boring, drilling and tapping, as well as automatic tool changing from a magazine orsimilar storage unit in accordan

14、ce with a machining programme. Most machining centres have facilities forautomatically changing the direction in which the workpieces are presented to the tool.The purpose of ISO 10791 is to supply information as wide and comprehensive as possible on tests and checkswhich can be carried out for comp

15、arison, acceptance, maintenance or any other purpose.ISO 10791 specifies, by reference to the relevant parts of ISO 230, Test code for machine tools, several familiesof tests for machining centres with horizontal or vertical spindle or with universal heads of different types,standing alone or integr

16、ated in flexible manufacturing systems. ISO 10791 also establishes the tolerances ormaximum acceptable values for the test results corresponding to general purpose and normal accuracymachining centres.ISO 10791 is also applicable, totally or partially, to numerically controlled milling and boring ma

17、chines, whentheir configuration, components and movements are compatible with the tests described herein.BS ISO 10791-10:20071Test conditions for machining centres Part 10:Evaluation of thermal distortions1ScopeThis part of ISO 10791 specifies, with reference to ISO 230-3, tests for the evaluation o

18、f thermal distortions ofthe machine structure and positioning system, up to in length, of machining centres. It gives three testmethods: environmental temperature variation error; thermal distortion caused by a rotating spindle; thermal distortion caused by moving linear axes.There is no intention o

19、f assigning any numerical tolerances associated with the tests specified.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced

20、document(including any amendments) applies.ISO 230-3:2007, Test code for machine tools Part 3: Determination of thermal effects3 Preliminary remarks3.1 Measuring unitsIn this part of ISO 10791, all linear dimensions and deviations are expressed in millimetres. All angulardimensions are expressed in

21、degrees. Angular deviations are, in principle, expressed in ratios; however, insome cases, microradians or arcseconds may be used for classification purposes. The equivalent of thefollowing expressions should always be kept in mind:The temperatures are expressed in degrees Celsius ( ).3.2 Reference

22、to ISO 230For the application of this part of ISO 10791, reference shall be made to ISO 230-3, especially for theinstallation of the machine before testing, description of measuring methods and presentation of the results.2 000 mm0,010/1 000 = 10rad 2primeprimeCBS ISO 10791-10:200723.3 Measuring ins

23、trumentsThe measuring instruments recommended in this document are given only by way of examples. Othermeasuring instruments capable of measuring the same quantities and having the same or a smallermeasurement uncertainty may be used.3.4 Testing sequenceThe tests given in this part of ISO 10791 may

24、be used either singularly or in any combination. Before each test,the machine tool should be in equilibrium with the environment. Therefore, a sufficient cooling down periodbetween tests, generally at least as long as the thermal test, where parts of the machine have been heated,shall be planned and

25、 respected.3.5 Tests to be performedWhen testing a machine, it is not always necessary or even possible to carry out all the tests given in this partof ISO 10791. When the tests are required for acceptance purposes, it is at the option of the user to choose, inagreement with the supplier/manufacture

26、r, those tests relating to the components and/or the properties of themachine that are of interest. These tests are to be clearly stated when ordering a machine. Mere reference tothis part of ISO 10791 for the acceptance tests, without specification of the tests to be carried out, and withoutagreeme

27、nt on the relevant expenses, cannot be considered as binding for any contracting party.4 Environmental temperature variation error (ETVE) test4.1 GeneralETVE tests are designed to reveal the effects of environmental temperature changes on the machine withrespect to deflection or deformation of the m

28、achine or its parts. They shall not be used for machine comparison.It is recommended that the supplier/manufacturer offer guidelines regarding the kind of thermal environmentthat should be acceptable for the machine to perform with the specified accuracy. It shall be the responsibility ofthe user to

29、 provide an acceptable thermal environment for the operation. However, if the user follows theguidelines provided by the machine supplier/manufacturer, the responsibility for machine performanceaccording to the specification reverts to the machine supplier/manufacturer.4.2 Test methodThe test method

30、 shall be in accordance with ISO 230-3:2007, 5.2. Figure 1 shows a typical test set-up.Axes might warm up when under NC “HOLD” mode, especially if they are in vertical direction. In such cases, itis recommended that the ETVE test be carried out with all controls on “OFF”. This shall be stated in the

31、 testreport.4.3 Measuring instrumentsFor this test, the required measuring instruments are the following: linear displacement sensors; temperature sensors; test mandrel; data acquisition equipment.BS ISO 10791-10:200734.4 Presentation of resultsTable 1 provides an example format for the presentation

32、 of the results; in addition, a graphical presentation ofresults should be provided in accordance with ISO 230-3:2007, 5.4.KeyX1, X2, Y1, Y2, Z linear displacement sensors1 ambient air temperature sensor2 spindle bearing temperature sensor3 test mandrel4 linear displacement sensors5fixtue6 fixture b

33、olted to tableFigure 1 Typical set-up for ETVE and thermal distortion caused by rotating spindle testsTable 1 Format for presentation of ETVE resultsParameter ResultsTime minETVEXmmETVEYmmETVEZmmETVEAarcsecETVEBarcsecBS ISO 10791-10:200744.5 Information to be recordedThe following information shall

34、be recorded:a) machine brand and model name;b) year of construction of machine, if available;c) machine serial number;d) time and date of test;e) location of the measurement set-up;f) location of temperature sensors;g) type of sensors;h) design and material of the test mandrel and fixture;i) thermal

35、 compensation procedure;j) any special test procedures;k) machine preparation procedure prior to testing;l) control ON or OFF;m) positive direction of drift (if different from coordinate system).5 Thermal distortion caused by rotating spindles5.1 RequirementOne test per spindle shall be carried out.

36、5.2 Test methodThe test method shall be in accordance with of ISO 230-3:2007, 6.2. Figure 1 shows a typical test set-up. Userand manufacturer/supplier shall agree as to whether a constant spindle speed or a variable speed spectrum isused. For the case of constant spindle speed, they also shall agree

37、 on the spindle speed to be used. For thevariable speed spectrum, they shall agree on the spindle speeds and time interval durations.NOTE A possible speed spectrum cycle would be a percentage of the maximum spindle speed for a set time, followed bya spindle stop for another fixed time (e.g. maximum

38、spindle speed for , followed by a stop). This cyclewould then be repeated for the complete test duration. The exact details of the speed spectrum would need to be discussedbetween the user and manufacturer/supplier.The test shall last for plus with the spindle stopped.5.3 Measuring instrumentsFor th

39、is test, the required measuring instruments are the following: linear displacement sensors; temperature sensors; test mandrel; data acquisition equipment.70 % 3min 1min4h 1hBS ISO 10791-10:200755.4 Presentation of resultsTable 2 provides an example of the format for the presentation of the results;

40、in addition, a graphicalpresentation of results should be provided, in accordance with ISO 230-3:2007, 6.4.5.5 Information to be recordedThe following information shall be recorded:a) machine brand and model name;b) year of construction, if available;c) machine serial number;d) time and date of test

41、;e) location of the measurement set-up;f) location of temperature sensors;g) type of sensors;h) design and material of the test mandrel and fixture;i) thermal compensation procedure;j) any special test procedures;k) machine preparation procedure prior to testing.l) spindle speed regime;m) positive d

42、irection of drift (if different from coordinate system);n) relative position of the spindle during measurement.6 Thermal distortion caused by linear motion of components6.1 Test methodThe test method shall be in accordance with ISO 230-3:2007, 7.2. Figure 2 shows a typical test set-up.In practice, t

43、here should be different feedrates for principal and for auxiliary axes.EXAMPLE A feedrate set for principal axes at , and one for auxiliary axes set at , of .The test cycle shall be made up of two time periods: of warming up the axis and for cooling it down. Themeasurements shall be interrupted whe

44、n the distortion change noted during the final is less than of the distortion registered over the initial of the test.Table 2 Format for presentation of results of thermal effects caused by rotating spindle CX1 Y1 Z A Bmm mm mm arcsec arcsecDuring first After end of period Distance, 60 mm d(EXC)P,60

45、= . d(EYC)P,60= . d(EZC)60= . d(EAC)60= . d(EBC)60= .t = . d(EXC)P1,t= . d(EYC)P1,t= . d(EZC)t= . d(EAC)t= . d(EBC)t= .l = .50 % 20 % fmax4h 1h60 min 15 %60 minBS ISO 10791-10:200766.2 Measuring instrumentsFor this test, the required measuring instruments are the following: linear displacement senso

46、rs; temperature sensors; special test mandrel; data aquisition equipment.6.3 Presentation of resultsFor each axis of the machine, the following plots versus time should be presented (e.g. for Figure 2 test set-up): two position plots of the target positions, one with , , , and the other with, , ; tw

47、o pitch plots of the target positions, one with , and the other with ; two roll plots of the target positions, one with , and the other with ; temperature plots of environment and machine during tests versus time.6.4 Information to be recordedThe following information shall be recorded:a) machine br

48、and and model name;b) year of construction, if available;c) machine serial number;d) time and date of test;e) location of measurement line;Figure 2 Typical test set-up for measuring thermal distortions due to linear motion of componentsd(EXX)P1d(EYX)P1d(EZX)P1d(EXX)P2d(EYX)P2d(EZX)P2d(EBX)P1d(EBX)P2

49、d(EAX)P1d(EAX)P2BS ISO 10791-10:20077f) location of temperature sensor;g) traverse rate;h) dwell times;i) start and end positions;j) compensation capabilities and facilities;k) instruments used;l) coefficient of thermal expansion used;m) warm up procedures;n) temperature of the measured object at start and end of test;o) positive direction of position drift (if different from co-ordinate system).BS ISO 10791-10:20078Bibliography1 ISO 1:2002, Geometrical Product Specifications (GPS) Standard referenc