1、BRITISH STANDARD BS ISO 10791-8:2001 Test conditions for machining centres Part 8: Evaluation of contouring performance in the three coordinate planes ICS 25.040.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 10791-8:2001 This British Standard, having been prepared u
2、nder the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 June 2001 BSI 06-2001 ISBN 0 580 37250 2 National foreword This British Standard reproduces verbatim ISO 10791-8:2001 and implements it as the UK national
3、standard. The UK participation in its preparation was entrusted to Technical Committee MTE/1, Machine tools, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement inte
4、rnational 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 purport to include all the
5、 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. aid enquirers to understand the text; present to the responsible international/European committ
6、ee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to i
7、v, pages 1 to 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsReference number ISO 10791-8:2001(E) INTERNATIONAL STANDARD ISO 10791-8 First edition 2001-
8、04-01 Test conditions for machining centres Part 8: Evaluation of contouring performance in the three coordinate planes Conditions dessai des centres dusinage Partie 8: valuation des performances en contournage dans les trois plans de coordonnesISO 10791-8:2001(E) ii ISO 10791-8:2001(E)iii Foreword
9、ISO (the International 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
10、committee has been 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 elect
11、rotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires a
12、pproval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO 10791 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 107
13、91-8 was prepared by Technical Committee 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 spindl
14、e and with accessory heads (horizontal 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: Accura
15、cy and repeatability of positioning 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 contouring performance in the three coordinate
16、planes Part 9: Evaluation of the operating times of tool change and pallet change Part 10: Evaluation of the thermal distortions Part 11: Evaluation of the noise emissionISO 10791-8:2001(E) iv Introduction A machining centre is a numerically controlled machine tool capable of performing multiple mac
17、hining 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. Most machining centres have facilities for automatically changing the direction in which the workpieces are present
18、ed to the tool. The purpose of ISO 10791 is to supply information as wide and comprehensive as possible on tests and checks which can be carried out for comparison, acceptance, maintenance or any other purpose. ISO 10791 specifies, by reference to the relevant parts of ISO 230, Test code for machine
19、 tools, several families of tests for machining centres with 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 correspo
20、nding to general purpose and normal accuracy machining centres. 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 ISO 1079
21、1-8:2001(E)1 Test conditions for machining centres Part 8: Evaluation of contouring performance in the three coordinate planes 1 Scope This part of ISO 10791 specifies a method of checking the contouring performance of machining centres (or numerically controlled milling machines, etc., where applic
22、able) by conducting circular tests in the three coordinate planes (XY, YZ and XZ) and by evaluating the radial deviation, F, and circular deviation, G, in accordance with ISO 230-4. NOTE Measurements of circular movements can be carried out by different methods as described in 6.6 of ISO 230-1:1996.
23、 These methods consist of using a rotating one-dimensional probe and a test mandrel, a circular masterpiece and a two-dimensional probe, or a telescoping ball bar. Other test methods may be applied if the accuracy of the equipment is the same as (or better than) the accuracy of the methods described
24、. Influences of typical machine deviations on circular paths are shown in annex B of ISO 230-4:1996. The purpose of the checks by circular tests described in this part of ISO 10791 is to verify the circular movement only in one position per coordinate plane of the machine, at only one feed rate, and
25、 to repeat the test once in the opposite contouring direction. The purpose of this part of ISO 10791 is not to provide a means of analysing the causes for the measured circular deviations, but to offer the user a method for periodic checking of the machine tool. It is recommended to carry out the te
26、sts of this part of ISO 10791 once the machine tool has satisfactorily undergone the acceptance tests and to use these results as a basis for comparison when carrying out periodic checks. Therefore, acceptable deviations from the initial results shall be decided by the user. If the tests are used fo
27、r machine acceptance purposes, the supplier/manufacturer and the user shall agree on specific diameters, feed rates and tolerances for the tests. NOTE ISO 10791-6, which deals with the accuracy of feeds, speeds and interpolations, also includes as test K4 a circular test. Here, the purpose is to che
28、ck the mutual behaviour of two linear axes (generally X and Y) at two defined feed rates for one defined diameter. This is more or less a diagnostic test with respect to the circular interpolation, whereas the circular tests of this part of ISO 10791 give information on the overall contouring perfor
29、mance of the machine. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 10791. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However,
30、parties to agreements based on this part of ISO 10791 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC mainta
31、in registers of currently valid International Standards.ISO 10791-8:2001(E) 2 ISO 230-1:1996, Test code for machine tools Part 1: Geometric accuracy of machines operating under no-load or finishing conditions. ISO 230-4:1996, Test code for machine tools Part 4: Circular tests for numerically control
32、led machine tools. 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 10791-3:1998, Test conditions for machining centres Part 3: Geometric tests for machines with integral indexable o
33、r continuous universal heads (vertical Z-axis). ISO 10791-4:1998, Test conditions for machining centres Part 4: Accuracy and repeatability of positioning of linear and rotary axes. ISO 10791-6:1998, Test conditions for machining centres Part 6: Accuracy of feeds, speeds and interpolations. ISO 10791
34、-7:1998, Test conditions for machining centres Part 7: Accuracy of a finished test piece. 3 Preliminary remarks 3.1 Reference to ISO 230-1 and ISO 230-4 To apply this part of ISO 10791, reference shall be made to ISO 230-1 and ISO 230-4, especially for the installation of the machine before testing,
35、 for the warming up of the spindle and other moving components, for the description of measuring methods, as well as for the recommended accuracy of testing equipment. 3.2 Testing sequence The sequence in which the tests are presented in this part of ISO 10791 in no way defines the practical order o
36、f testing. With a view to making the mounting of instruments or gauging easier, tests may be performed in any order. 3.3 Tests to be performed When testing a machine, it is not always necessary or possible to carry out all the tests described in this part of ISO 10791. When the tests are required fo
37、r 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 interest. These tests shall be clearly stated when ordering a machine. The mere reference to this part of ISO 1
38、0791 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 of the contracting parties. 3.4 Measuring instruments The measuring instruments indicated in the tests described in clause 4 are examp
39、les only. Other instruments measuring the same quantities and having at least the same accuracy may be used. 4 Circular tests See tests C1 to C3.ISO 10791-8:2001(E)3 Object C1 Checking of the radial deviation, F, or circular deviation, G, according to ISO 230-4 in the XY-plane over at least 190 for
40、clockwise and for counter-clockwise contouring. Measuring conditions diameter of nominal path feed rate location of measuring instrument centre of circle (X/Y/X) offset to tool reference (X/Y/Z) offset to workpiece reference (X/Y/Z) temperatures test environment temperature temperature of measuring
41、instrument machine temperature data acquisition method starting point number of measuring points data smoothing process compensation used positions of axis not under test Measured deviation angle over which the test is carried out = F XY, min = F XY, max = F YX, min = F YX, max = or G XY = G YX = Me
42、asuring instruments According to 6.63 of ISO 230-1:1996, that is rotating one-dimensional probe, or circular masterpiece and two-dimensional probe, or telescoping ball bar. Observations The following measuring conditions are recommended unless others are agreed upon by the supplier/manufacturer and
43、user: choose a diameter that corresponds to about 2/3 of the shorter axis; choose any feed rate higher than 1/3 of the maximum feed rate. Measurement location: the axes are in the middle of the working part of their travel, irrespective of the region to where the table moves for tool/pallet change p
44、urposes Start the circular movement in one of the four quadrants, preferably not in one of the four reversal points, in order not to miss the performance of the machine at those points. If the diameter of the circular path is not 2/3 of the shortest axis or if the travels of the two axes differ by m
45、ore than 50 %, more than one test per coordinate plane should be carried out at different positions of the circular path in order to check at least 2/3 of the travel of the axes. This test may be influenced by the following deviations : straightness of linear motions tests G1 a), G3 a) in ISO 10791-
46、1:1998; tests G1 b), G2 b) in ISO 10791-3:1998; angular deviations of linear motions tests G4, G6 in ISO 10791-1:1998, tests G4, G5 in ISO 10791-3:1998; squareness between linear motions test G7 in ISO 10791-1:1998; test G9 in ISO 10791-3:1998; positioning of linear axes (ISO 10791-4); linear and ci
47、rcular interpolation tests K3 a), b), c) for vertical machines; and tests K3 e), f) for horizontal machines in ISO 10791-6:1998; test K4 in ISO 10791-6:1998. NOTE As there is a good correspondence between machined circles and circular measurements, the circle machined by circular interpolation of th
48、e test piece as defined in ISO 10791-7 will show similar deviations as the circular measurements of this test.ISO 10791-8:2001(E) 4 Object C2 Checking of the radial deviation, F, or circular deviation, G, according to ISO 230-4 in the YZ-plane over at least 190 o for clockwise and counter-clockwise
49、contouring. Measuring conditions diameter of nominal path feed rate location of measuring instrument centre of circle (X/Y/X) offset to tool reference (X/Y/Z) offset to workpiece reference (X/Y/Z) temperatures test environment temperature temperature of measuring instrument machine temperature data acquisition method starting point number of measuring points data smoothing process compensation used positions of axis not under test Measured deviation angle over which the test is
