1、BRITISH STANDARD BS ISO 10791-4:1998 Test conditions for machining centres Part 4: Accuracy and repeatability of positioning of linear and rotary axes ICS 25.040.10BSISO10791-4:1998 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe
2、authority of the Standards Board and comes intoeffect on 15 August 1998 BSI 05-1999 ISBN 0 580 30082 X National foreword This British Standard reproduces verbatim ISO10791-4:1998 and implements it as the UK national standard. It partially replaces BS4656-30:1992 which will be withdrawn once all othe
3、r parts of this standard are published. The UK participation in its preparation was entrusted to Technical Committee MTE/1, Machine tools, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpret
4、ation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which i
5、mplement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not p
6、urport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside fron
7、t cover, pagesi andii, theISO title page, pagesii toiv, pages1 to5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Dat
8、e CommentsBSISO10791-4:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO10791-4 1ii blankBSISO10791-4:1998 ii BSI 05-1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative references 1 3 Preliminary remarks 1 3.1 Measuring units 1 3.2 Refere
9、nce to ISO 230-2 1 3.3 Testing sequence 1 3.4 Tests to be performed 1 3.5 Position of linear axes not under test 2 4 Positioning of linear axes 2 4.1 Tolerances 2 4.2 Measuring instruments 2 4.3 Observations and references to ISO 230-1 and ISO 230-2 2 4.4 Calculated deviations 2 5 Positioning of rot
10、ary axes 3 5.1 Tolerances 3 5.2 Measuring instruments 3 5.3 Observations and references to ISO 230-1 and ISO 230-2 3 5.4 Calculated deviations 3 6 Information to be recorded 4 6.1 Data identifying the machine 4 6.2 Data identifying the test 4 6.3 Data on the test conditions 4 Annex A (informative) B
11、ibliography 5 Table 1 Positioning tolerances for axes up to2000 mm 2 Table 2 Format for the presentation of the results of the full test up to2000mm 2 Table 3 Positioning tolerances for axes up to360 3 Table 4 Format for the presentation of the results of the full test up to360 3 Descriptors: Machin
12、ing centre, numerical control, machine tools, coordinates, positioning, tests, geometric tests, determination, accuracy, testing conditions.BSISO10791-4:1998 BSI 05-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
13、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 established has the right to be represented on that committee. International organizations, govern
14、mental 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 standardization. Draft International Standards adopted by the technical committees are circulated to the
15、member bodies for voting. Publication as an International Standard requires approval by atleast75% of the member bodies casting avote. International Standard ISO10791-4 was prepared by Technical Committee ISO/TC39, Machine tools, Subcommittee SC2, Test conditions for metal cutting machine tools. ISO
16、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 spindle or universal heads with vertical
17、 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 positioning of linear and rotary axes; Part 5: Accuracy and repeatability of positioning of work-holding pallets
18、; 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 the operating times of tool change and pallet change; Part 10: Evaluation of the thermal distortio
19、ns; Part 11: Evaluation of the noise emission; Part 12: Evaluation of the vibration severity. Annex A of this part of ISO10791 is for information only.iv blankBSISO10791-4:1998 BSI 05-1999 1 Introduction A machining centre is a numerically controlled machine tool capable of performing multiple machi
20、ning 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 supply information as wide and comprehensive as possible on tests which can be carried
21、out for comparison, acceptance, maintenance or any other purpose. ISO 10791 specifies, with reference to the relevant parts of ISO230, Test code for machine tools, several families of tests for machining centres with horizontal or vertical spindle or with universal heads of different types, standing
22、 alone or integrated in flexible manufacturing systems. ISO10791 also establishes the tolerances or maximum acceptable values for the test results corresponding to general purpose and normal accuracy machining centres. ISO 10791 is also applicable, totally or partially, to numerically controlled mil
23、ling and boring machines, when their configuration, components and movements are compatible with the tests described herein. 1 Scope This part of ISO10791 specifies, with reference to ISO230-2, the tolerances which apply to the positioning tests for linear axes, up to 2000mm in length, and rotary ax
24、es of machining centres. It does not deal with environmental conditions, warm-up of the machine and measuring methods, already described in ISO230-2. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO1079
25、1. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO10791 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS
26、O maintain registers of currently valid International Standards. ISO 230-1:1996, Test code for machine tools Part1: Geometric accuracy of machines operating under no-load or finishing conditions. ISO 230-2:1997, Test code for machine tools Part2: Determination of accuracy and repeatability of positi
27、oning numerically controlled axes. ISO 10791-1:1998, Test conditions for machining centres Part 1: Geometric tests for machines with horizontal spindle and with accessory heads (horizontal Z-axis). ISO 10791-2:, Test conditions for machining centres Part2: Geometric tests for machines with vertical
28、spindle or universal heads with vertical primary rotary axis (vertical Z-axis) 1) . ISO 10791-3:1998, Test conditions for machining centres Part3: Geometric tests for machines with integral indexable or continuous universal heads (vertical Z-axis). 3 Preliminary remarks 3.1 Measuring units In this p
29、art of ISO10791, 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 should always
30、be kept in mind: 0,010/1000=10 10 6 20 3.2 Reference to ISO 230-2 To apply this part of ISO10791, reference shall be made to ISO230-2, especially for the environmental conditions, warming up of the machine, description of measuring methods, evaluation and presentation of the results. 3.3 Testing seq
31、uence The sequence in which the tests are presented in this part of ISO10791 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 is not always neces
32、sary nor possible to carry out all the tests described in this part of ISO10791. 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 machine which are of
33、interest. These tests are to be clearly stated when ordering a machine. Mere reference to this part of ISO10791 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 contracting party. 1) To b
34、e published.BSISO10791-4:1998 2 BSI 05-1999 3.5 Position 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 def
35、lections of elements affecting the measurements. Sliding spindles, rams, etc., when they are supplementary axes, shall be kept retracted. 4 Positioning of linear axes 4.1 Tolerances Table 1 gives the positioning tolerances, as defined in clause2 of ISO230-2:1997, for machining centres of normal accu
36、racy, related to different measurement travels up to2000mm. In addition, a graphical presentation of results should be provided as specified in ISO230-2:1997. 4.2 Measuring instruments Laser interferometer, or other measuring systems with comparable accuracy may be used (see5.1 of ISO230-1:1996). 4.
37、3 Observations and references to ISO230-1 and ISO230-2 When the laser interferometer is used, proper precautions shall be taken according toA.13 of ISO230-1:1996. As for the performance of the test, the procedures indicated in ISO230-2:1997 shall be followed, in particular4.3.2 for the full check up
38、to2000mm. 4.4 Calculated 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 graphical presentation of results should be provided as specified in ISO230-2:1997. Table 1 Positioning t
39、olerances for axes up to 2 000 mm Table 2 Format for the presentation of the results of the full test up to2000mm Tolerances mm Measurement travel of the axis mm5008001250 2000 Bidirectional accuracy of positioning A 0,022 0,025 0,032 0,042 Unidirectional accuracy of positioning A andA 0,016 0,020 0
40、,025 0,030 Bidirectional repeatability of positioning R 0,012 0,015 0,018 0,020 Unidirectional repeatability of positioning R and R 0,006 0,008 0,010 0,013 Reversal value B 0,010 0,010 0,012 0,012 Mean reversal value 0,006 0,006 0,008 0,008 Bidirectional systematic deviation of positioning E 0,015 0
41、,018 0,023 0,030 Unidirectional systematic deviation of positioning E and E 0,010 0,012 0,015 0,018 Range of the mean bidirectional positional deviation M 0,010 0,012 0,015 0,020 Results mm Axis name and relevant travel mm Bidirectional accuracy of positioning A Accuracy of positioning (positive) A
42、Accuracy of positioning (negative) A Bidirectional repeatability of positioning R Repeatability of positioning (positive) R Repeatability of positioning (negative) R Reversal value B Mean reversal value Bidirectional systematic deviation of positioning E Systematic deviation of positioning (positive
43、) E Systematic deviation of positioning (negative) E Range of the mean bidirectional positional deviation M B BBSISO10791-4:1998 BSI 05-1999 3 5 Positioning of rotary axes 5.1 Tolerances Table 3 gives the positioning tolerances, as defined in clause2 of ISO230-2:1997, for machining centres of normal
44、 accuracy, related to measurement travels up to360. 5.2 Measuring instruments Laser angle interferometer with indexing table, autocollimator with polygonal mirror, or other measuring systems with comparable accuracy may be used. 5.3 Observations and references to ISO230-1 and ISO230-2 When the autoc
45、ollimator is used, proper precautions shall be taken according toA.11 of ISO230-1:1996. As for the performance of the test, the procedures indicated in ISO230-2:1997 shall be followed, in particular4.3.4 for the full check up to360. 5.4 Calculated deviations Table 4 provides an example of the format
46、 for the presentation of the results determined through the statistical analysis of the measured data. In addition, a graphical presentation of results should be provided as specified in ISO230-2:1997. Table 3 Positioning tolerances for axes up to 360 Table 4 Format for the presentation of the resul
47、ts of the full test up to 360 Tolerances arc seconds Bidirectional accuracy of positioning A 28 Unidirectional accuracy of positioning A and A 22 Bidirectional repeatability of positioning R 16 Unidirectional repeatability of positioning R and R 8 Reversal value B 12 Mean reversal value 8 Bidirectio
48、nal systematic deviation of positioning E 20 Unidirectional systematic deviation of positioning E and E 14 Range of the mean bidirectional positional deviation M 12 Results arc seconds Axis name Bidirectional accuracy of positioning A Accuracy of positioning (positive) A Accuracy of positioning (neg
49、ative) A Bidirectional repeatability of positioning R Repeatability of positioning (positive) R Repeatability of positioning (negative) R Reversal value B Mean reversal value Bidirectional systematic deviation of positioning E Systematic deviation of positioning (positive) E Systematic deviation of positioning (negative) E Range of the mean bidirectional positional deviation M B BBSISO10791-4:1998 4 BSI 05-1999 6 Information to be recorded To comply with this part of ISO 10791, the test
