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1、A Reference number ISO 10791-4:1998(E) INTERNATIONAL STANDARD ISO 10791-4 First edition 1998-07-01 Test conditions for machining centres Part 4: Accuracy and repeatability of positioning of linear and rotary axes Conditions dessai pour centres dusinage Partie 4: Prcision et rptabilit de positionneme
2、nt des axes linaires et rotatifs ISO 10791-4:1998(E) ISO 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the
3、 publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerland ii ContentsPage 1Scope.1 2Normative references.1 3Preliminary remarks.2 3.1Measuring units2 3.2Reference to ISO 230-2.2 3.3Testing sequence.2 3.4Tests to b
4、e performed2 3.5Position of linear axes not under test .2 4Positioning of linear axes .2 4.1Tolerances.2 4.2Measuring instruments.3 4.3Observations and references to ISO 230-1 and ISO 230-2 .3 4.4Calculated deviations.3 5Positioning of rotary axes.4 5.1Tolerances.4 5.2Measuring instruments.5 5.3Obse
5、rvations and references to ISO 230-1 and ISO 230-2 .5 5.4Calculated deviations.5 6Information to be recorded.5 6.1Data identifying the machine5 6.2Data identifying the test6 6.3Data on the test conditions.6 Annex A (informative) Bibliography .7 ISOISO 10791-4:1998(E) iii Foreword ISO (the Internatio
6、nal Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been
7、established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standar
8、dization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 10791-4 was prepared by Technical Co
9、mmittee ISO/TC 39, Machine tools, Subcommittee SC 2, Test conditions for 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 (horiz
10、ontal Z-axis) Part 2: Geometric tests for machines with vertical spindle or universal heads with vertical primary rotary axis (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 positioni
11、ng of linear and rotary axes Part 5: Accuracy and repeatability of positioning of work-holding pallets Part 6: Accuracy of feeds, speeds and interpolations Part 7: Accuracy of a finished test piece Part 8: Evaluation of the contouring performance in the three coordinate planes Part 9: Evaluation of
12、the operating times of tool change and pallet change Part 10: Evaluation of the thermal distortions Part 11: Evaluation of the noise emission Part 12: Evaluation of the vibration severity Annex A of this part of ISO 10791 is for information only. ISO 10791-4:1998(E) ISO iv Introduction A machining c
13、entre is a numerically controlled machine tool capable of performing multiple machining operations, including milling, boring, drilling and tapping, as well as automatic tool changing from a magazine or similar storage unit in accordance with a machining programme. The object of ISO 10791 is to supp
14、ly information as wide and comprehensive as possible on tests which can be carried out for comparison, acceptance, maintenance or any other purpose. ISO 10791 specifies, with reference to the relevant parts of ISO 230, Test code for machine tools, several families of tests for machining centres with
15、 horizontal or vertical spindle or with universal heads of different types, standing alone or integrated in flexible manufacturing systems. ISO 10791 also establishes the tolerances or maximum acceptable values for the test results corresponding to general purpose and normal accuracy machining centr
16、es. ISO 10791 is also applicable, totally or partially, to numerically controlled milling and boring machines, when their configuration, components and movements are compatible with the tests described herein. -,-,- INTERNATIONAL STANDARD ISOISO 10791-4:1998(E) 1 Test conditions for machining centre
17、s Part 4: Accuracy and repeatability of positioning of linear and rotary axes 1Scope This part of ISO 10791 specifies, with reference to ISO 230-2, the tolerances which apply to the positioning tests for linear axes, up to 2 000 mm in length, and rotary axes of machining centres. It does not deal wi
18、th environmental conditions, warm-up of the machine and measuring methods, already described in ISO 230-2. 2Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 10791. At the time of publication, the editions
19、 indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 10791 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid In
20、ternational Standards. ISO 230-1:1996, Test code for machine tools Part 1: Geometric accuracy of machines operating under no-load or finishing conditions. ISO 230-2:1997, Test code for machine tools Part 2: Determination of accuracy and repeatability of positioning numerically controlled axes. ISO 1
21、0791-1:1998, Test conditions for machining centres Part 1: Geometric tests for machines with horizontal spindle and with accessory heads (horizontal Z-axis). ISO 10791-2:1), Test conditions for machining centres Part 2: Geometric tests for machines with vertical spindle or universal heads with verti
22、cal primary rotary axis (vertical Z-axis). ISO 10791-3:1998, Test conditions for machining centres Part 3: Geometric tests for machines with integral indexable or continuous universal heads (vertical Z-axis). _ 1) To be published. -,-,- ISO 10791-4:1998(E) ISO 2 3Preliminary remarks 3.1Measuring uni
23、ts In this part of ISO 10791, all linear dimensions, deviations and corresponding tolerances are expressed in millimetres; angular dimensions are expressed in degrees, and angular deviations and the corresponding tolerances are expressed in arc seconds. The equivalence of the following expressions s
24、hould always be kept in mind: 0,010/1 000 = 10 10-6 2 3.2 Reference to ISO 230-2 To apply this part of ISO 10791, reference shall be made to ISO 230-2, especially for the environmental conditions, warming up of the machine, description of measuring methods, evaluation and presentation of the results
25、. 3.3 Testing sequence The sequence in which the tests are presented in this part of ISO 10791 in no way defines the practical order of testing. In order to make the mounting of instruments or gauging easier, tests may be performed in any order. 3.4 Tests to be performed When testing a machine, it i
26、s not always necessary nor possible to carry out all the tests described in this part of ISO 10791. When the tests are required for acceptance purposes, it is up to the user to choose, in agreement with the supplier/manufacturer, those tests relating to the components and/or the properties of the ma
27、chine which are of interest. These tests are to be clearly stated when ordering a machine. Mere reference to this part of ISO 10791 for the acceptance tests, without specifying the tests to be carried out, and without agreement on the relevant expenses, cannot be considered as binding for any contra
28、cting party. 3.5Position of linear axes not under test During the check of an axis, those of the three basic linear axes not involved in the test shall be kept as far as possible in the middle of their working travel, or otherwise in a position such as to minimize deflections of elements affecting t
29、he measurements. Sliding spindles, rams, etc., when they are supplementary axes, shall be kept retracted. 4Positioning of linear axes 4.1Tolerances Table 1 gives the positioning tolerances, as defined in clause 2 of ISO 230-2:1997, for machining centres of normal accuracy, related to different measu
30、rement travels up to 2 000 mm. In addition, a graphical presentation of results should be provided as specified in ISO 230-2:1997. -,-,- ISO ISO 10791-4:1998(E) 3 Table 1 Positioning tolerances for axes up to 2 000 mm Tolerances Measurement travel of the axis mm mm 500 800 1 250 2 000 Bidirectional
31、accuracy of positioningA0,0220,0250,0320,042 Unidirectional accuracy of positioningA and A0,0160,0200,0250,030 Bidirectional repeatability of positioningR0,0120,0150,0180,020 Unidirectional repeatability of positioningR and R0,0060,0080,0100,013 Reversal value B0,0100,0100,0120,012 Mean reversal val
32、ue B0,0060,0060,0080,008 Bidirectional systematic deviation of positioningE0,0150,0180,0230,030 Unidirectional systematic deviation of positioningE and E0,0100,0120,0150,018 Range of the mean bidirectional positional deviation M0,0100,0120,0150,020 4.2Measuring instruments Laser interferometer, or o
33、ther measuring systems with comparable accuracy may be used (see 5.1 of ISO 230-1:1996). 4.3Observations and references to ISO 230-1 and ISO 230-2 When the laser interferometer is used, proper precautions shall be taken according to A.13 of ISO 230-1:1996. As for the performance of the test, the pro
34、cedures indicated in ISO 230-2:1997 shall be followed, in particular 4.3.2 for the full check up to 2 000 mm. 4.4Calculated deviations Table 2 provides an example of the format for the presentation of the results determined through the statistical analysis of the measured data. In addition, a graphi
35、cal presentation of results should be provided as specified in ISO 230-2:1997. -,-,- ISO 10791-4:1998(E) ISO 4 Table 2 Format for the presentation of the results of the full test up to 2 000 mm Results Axis name and relevant travel mm mm Bidirectional accuracy of positioningA Accuracy of positioning
36、 (positive)A Accuracy of positioning (negative)A Bidirectional repeatability of positioningR Repeatability of positioning (positive)R Repeatability of positioning (negative)R Reversal value B Mean reversal value B Bidirectional systematic deviation of positioningE Systematic deviation of positioning
37、 (positive)E Systematic deviation of positioning (negative)E Range of the mean bidirectional positional deviation M 5Positioning of rotary axes 5.1Tolerances Table 3 gives the positioning tolerances, as defined in clause 2 of ISO 230-2:1997, for machining centres of normal accuracy, related to measu
38、rement travels up to 360o. Table 3 Positioning tolerances for axes up to 360o Tolerances arc seconds Bidirectional accuracy of positioningA28 Unidirectional accuracy of positioningA and A22 Bidirectional repeatability of positioningR16 Unidirectional repeatability of positioningR and R8 Reversal val
39、ueB12 Mean reversal valueB8 Bidirectional systematic deviation of positioningE20 Unidirectional systematic deviation of positioningE and E14 Range of the mean bidirectional positional deviationM12 -,-,- ISO ISO 10791-4:1998(E) 5 5.2Measuring instruments Laser angle interferometer with indexing table
40、, autocollimator with polygonal mirror, or other measuring systems with comparable accuracy may be used. 5.3Observations and references to ISO 230-1 and ISO 230-2 When the autocollimator is used, proper precautions shall be taken according to A.11 of ISO 230-1:1996. As for the performance of the tes
41、t, the procedures indicated in ISO 230-2:1997 shall be followed, in particular 4.3.4 for the full check up to 360o. 5.4Calculated deviations Table 4 provides an example of the format for the presentation of the results determined through the statistical analysis of the measured data. In addition, a
42、graphical presentation of results should be provided as specified in ISO 230-2:1997. Table 4 Format for the presentation of the results of the full test up to 360o Results Axis name arc seconds Bidirectional accuracy of positioningA Accuracy of positioning (positive)A Accuracy of positioning (negati
43、ve)A Bidirectional repeatability of positioningR Repeatability of positioning (positive)R Repeatability of positioning (negative)R Reversal value B Mean reversal value B Bidirectional systematic deviation of positioningE Systematic deviation of positioning (positive)E Systematic deviation of positio
44、ning (negative)E Range of the mean bidirectional positional deviation M 6Information to be recorded To comply with this part of ISO 10791, the test report shall include the information given in 6.1 to 6.3. 6.1Data identifying the machine a)name of the manufacturer; b)year of construction, if availab
45、le; c)type and serial number; d)configuration of the machine according to 3.9 or 3.10 of ISO 10791-1:1998, ISO 10791-2: and ISO 10791-3:1998, if possible. ISO 10791-4:1998(E) ISO 6 6.2Data identifying the test a)date and place of the test; b)company and name of the inspector; c)list of the testing e
46、quipment used, including manufacturers name, type and serial number of the components (e.g. laser head, optics, temperature sensors). 6.3Data on the test conditions a)machine component moving along or around the axis under test; b)feed rate; c)positions of the axis slides or moving components on the
47、 axes which are not under test; d)position of the measurement line; e)number and positions of temperature sensors; f)readings of the temperature sensors immediately before and after the test; g)expansion coefficient used for material compensation; h)if relevant, air temperature, pressure and humidit
48、y, immediately before and after the test; i)type of compensation applied to the machine axes; j)type of compensation applied to the measurement data. -,-,- ISO ISO 10791-4:1998(E) 7 Annex A (informative) Bibliography 1ISO 841:2), Industrial automation systems Physical device control Coordinate system and motion nomenclature. _ 2) To be published. (Revision of ISO 841:1974) -,-,- ISO 10791-4:1998(E) ISO ICS 25.040.10 Descriptors: machining centre, numerical control, machine tools, coordinate