1、BRITISH STANDARD BS ISO 10791-3:1998 Test conditions for machining centres Part3: Geometric tests for machines with integral indexable or continuous universal heads (vertical Z-axis) ICS 25.040.10BSISO10791-3:1998 This British Standard, having been prepared under the directionof the Engineering Sect
2、orCommittee, was publishedunder the authority ofthe Standards Committee andcomes into effect on 15 March1999 BSI 05-1999 ISBN 0 580 30977 0 National foreword This British Standard reproduces verbatim ISO10791-3:1998 and implements it as the UK national standard. It partially replaces BS4656-30:1992
3、which will be withdrawn once all other parts of this standard are published The UK participation in its preparation was entrusted to Technical Committee MTE/1, Machine tools, which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 comm
4、ittee any enquiries on the interpretation, or proposals for change, and keep the UKinterests 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-refer
5、ences The British Standards which implement 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 Catal
6、ogue. A British Standard does not purport 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 comp
7、rises a front cover, an inside front cover, pages i and ii, theISO title page, pagesii toiv, pages1 to46, an inside back cover and abackcover. 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 fro
8、nt cover. Amendments issued since publication Amd. No. Date CommentsBSISO10791-3:1998 BSI 05-1999 i Contents Pages National foreword Inside front cover Foreword iii Text of ISO 10791-3 1ii blankBSISO10791-3:1998 ii BSI 05-1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative reference
9、 1 3 Preliminary remarks 1 3.1 Measuring units 1 3.2 Reference to ISO230-1 1 3.3 Testing sequence 2 3.4 Tests to be performed 2 3.5 Measuring instruments 2 3.6 Diagrams 2 3.7 Pallets 2 3.8 Software compensation 2 3.9 Machine configurations 2 3.10 Designation 2 3.11 Minimum tolerance 2 4 Geometric te
10、sts 5 4.1 Straightness of linear motions 5 4.2 Angular deviations of linear motions 8 4.3 Squareness between linear motions 11 4.4 Spindle 14 4.5 Table or pallet 16 Annex A (normative) Integral universal45 split indexable heads 24 Annex B (normative) Integral universal swivel heads 33 Annex C (norma
11、tive) Integral universal45 split continuous heads 40 Annex D (informative) Bibliography Inside back cover Figure 1 3 Table 1 Classification of configurations of horizontalprimaryrotaryaxismachining centres 4 Descriptors: Machining centre, numerical control, machine tools, positioning, tests, geometr
12、ic tests, testing conditions.BSISO10791-3:1998 BSI 05-1999 iii Foreword 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 com
13、mittees. 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, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
14、 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 least75%of the membe
15、r bodies casting a vote. International Standard ISO10791-3 was prepared by Technical Committee ISO/TC 39, Machine tools, Subcommittee SC2, Test conditions for metal cutting machine tools. ISO10791 consists of the following parts, under the general title Test conditions for machining centres: Part1:
16、Geometric tests for machines with horizontal spindle and with accessory heads (horizontal Z-axis); Part2: Geometric tests for machines with vertical spindle or universal heads with vertical primary rotary axis (vertical Z-axis); Part3: Geometric tests for machines with integral indexable or continuo
17、us universal heads (vertical Z-axis); Part4: Accuracy and repeatability of positioning of linear and rotary axes; Part5: Accuracy and repeatability of positioning of work-holding pallets; Part6: Accuracy of feeds, speeds and interpolations; Part7: Accuracy of a finished test piece; Part8: Evaluation
18、 of the contouring performance in the three coordinate planes; Part9: Evaluation of the operating times of tool change and pallet change; Part10: Evaluation of the thermal distortions; Part11: Evaluation of the noise emission. Annex A Annex B and Annex C form an integral part of this part of ISO1079
19、1. Annex D is for information only.iv blankBSISO10791-3:1998 BSI 05-1999 1 Introduction A machining centre 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
20、 or similar storage unit in accordance with a machining programme. The object of ISO10791 is to supply information as wide and comprehensive as possible on tests which can be carried out for comparison, acceptance, maintenance or any other purpose. ISO10791 specifies, with reference to the relevant
21、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 alone or integrated in flexible manufacturing systems. ISO10791 also establishes the tolerances or maximum acceptable
22、 values for the test results corresponding to general purpose and normal accuracy machining centres. ISO10791 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 he
23、rein. 1 Scope This part of ISO10791 specifies, with reference to ISO230-1, the geometric tests for machining centres (or numerically controlled milling machines, boring machines, etc., where applicable) with integral indexable or continuous universal heads (vertical Z-axis). This part of ISO10791 ap
24、plies to machining centres having basically six numerically controlled axes, of which three are linear (X, Y and Z) up to2000mm in length, and three are rotary (A or D and B on the head, and C on the table). Movements other than those mentioned are considered as special features and the relevant tes
25、ts are not included in this part of ISO10791. This part of ISO10791 describes geometric tests for three possible types of accessory universal heads, in the annexes: Annex A: Integral universal45 split indexable heads (B and D axes), with mechanical indexing of the different angular positions of the
26、two bodies (e.g.Hirth couplings): the relevant tests (AG1 to AG9) check only the resulting position of the spindle; Annex B: Integral universal swivel heads (Band A axes), with two numerically controlled rotary axes perpendicular to each other (tests BG1 to BG7); Annex C: Integral universal45 split
27、continuous heads (B and D axes), similar to the first type but provided with continuous positioning of the two numerically controlled rotary axes: the relevant tests (CG1 to CG7) check all the geometric features (planes and axes) which contribute to the resulting position of the spindle, excluding t
28、he positioning accuracy of the two rotary axes; these tests can also be used for a deeper investigation on the45 indexable heads, if their movements and locks allow this. This part of ISO10791 deals only with the verification of accuracy of the machine and does not apply to the testing of the machin
29、e operation, which should generally be checked separately. Certain tests concerning the performance of the machine operating under no-lead or finishing conditions are included in other parts of ISO10791. 2 Normative reference The following standard contains provisions which, through reference in thi
30、s text, constitute provisions of this part of ISO10791. At the time of publication, the edition indicated was 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 edition of th
31、e standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO230-1:1996, Test code for machine tools Part1: Geometric accuracy of machines operating under no-load or finishing conditions. 3 Preliminary remarks 3.1 Measuring units In this part o
32、f 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 ratios, but in some cases microradians or arc seconds may be used for clarifi
33、cation purposes. The equivalence of the following expressions should always be kept in mind: 0,010/1000=104rad 20 3.2 Reference to ISO230-1 To apply this part of ISO10791, reference shall be made to ISO230-1, especially for the installation of the machine before testing, warming up of the spindle an
34、d other moving components, description of measuring methods and recommended accuracy of testing equipment.BSISO10791-3:1998 2 BSI 05-1999 In the “Observations” block of the tests described in clause4 and Annex A to Annex C, the instructions are followed by a reference to the corresponding clause in
35、ISO230-1 in cases where the test concerned is in compliance with the specifications of ISO230-1. 3.3 Testing sequence 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 easie
36、r, tests may be performed in any order. 3.4 Tests to be performed When testing a machine, it is not always necessary 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
37、supplier/manufacturer, those tests relating to the components and/or the properties of the machine which are of 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, an
38、d without agreement on the relevant expenses, cannot be considered as binding for any contracting party. 3.5 Measuring instruments The measuring instruments indicated in the tests described in clause4 and Annex A to Annex C are examples only. Other instruments measuring the same quantities and havin
39、g at least the same accuracy may be used. Dial gauges shall have a resolution of0,001mm or better. 3.6 Diagrams In this part of ISO10791, for reasons of simplicity, the diagrams associated with geometric tests illustrate only one type of machine. 3.7 Pallets For machines working with several pallets
40、, the tests concerning the intrinsic geometric features or their behaviour in relation to the axes of the machine (tests G12 to G19) are to be performed on only one representative pallet clamped in position, unless otherwise specified by a written agreement between the user and the supplier/manufact
41、urer. 3.8 Software compensation When software facilities are available for compensating certain geometric deviations, based on an agreement between the user and the supplier/manufacturer, the relevant test may be carried out with or without these compensations. When the software compensation is used
42、, this shall be stated in the test results. 3.9 Machine configurations The machines considered in this part of ISO10791 are divided into12 basic family configurations based on their architectures and the components moving along the linear axes. These families are identified by means of numbers from0
43、1 to12 as shown in Figure 1. The classification of these configurations is shown in Table 1 1) . 3.10 Designation A designation is also supplied, as a short code, in order to define the architecture of a machining centre; this designation is given by the following elements, in the given order: a) “m
44、achining centre” b) the reference of this part of ISO10791, i.e.ISO10791-3; c) the letter “A” for type A heads (as specified in Annex A); d) the letter “B” for type B heads (as specified in Annex B); e) the letter “C” for type C heads (as specified in Annex C); f) the number indicated in the relevan
45、t box of Figure 1 and the left-hand column of Table 1. EXAMPLE A machining centre, with universal integral head, with the column moving along the X-axis, the spindle head slide moving along the Z-axis and the table moving along the Y-axis is designated as follows: Machining centre ISO10791-3 type A0
46、2 3.11 Minimum tolerance When establishing the tolerance for a measuring length different from that given in this part of ISO10791 (see2.311 of ISO230-1:1996), it shall be taken into consideration that the minimum value of tolerance is0,005mm. 1) Some vertical machining centres are built with an arc
47、hitecture similar to type V10 (portal type) or V11 (gantry type) but with only one column. ISO10791-3 is applicable to them as well. In this case, when necessary, the text should be modified by replacing the terms “portal” or “gantry” with “column”, and “cross rail” with “arm”.BSISO10791-3:1998 BSI
48、05-1999 3 Figure 1 BSISO10791-3:1998 4 BSI 05-1999 Table 1 Classification of configurations of horizontal primary rotary axis machining centres X X9 9 Y Y9 9 Z Z9 9 01 Table on its saddle Spindle head Table saddle 02 Column Spindle head Table 03 Table on its saddle Knee Table saddle 04 Table saddle
49、Spindle head Table on its saddle 05 Column on its saddle Spindle head Column saddle 06 Knee Knee saddle Spindle head 07 Table Spindle head Column 08 Column saddle Spindle head Column on its saddle 09 Knee saddle Knee Spindle head 10 Table Spindle head slide Spindle head on its slide 11 Column Spindle head slide Spindle head on its slide 12 Spindle head slide Knee Spindle head on its slideBSISO10791-3:1998 BSI 05-1999 5 4 Geometric tests 4.1 Straightness of linear motions Object G1 Checking of straightness of the X-axis motion:
