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1、BRITISH STANDARD BS ISO 230-4:1996 Implementation of ISO 230-4:1996 Test code for machine tools Part 4: Circular tests for numerically controlled machine tools ICS 25.040.20 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 230-4:1996 T
2、his British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 March 1997 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference MTE/1 Draf
3、t for comment 94/701555 DC ISBN 0 580 27042 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee MTE/1, Machine tools, upon which the following bodies were represented: Advanced Manufacturing Technology Research Institute Br
4、itish Engineers Cutting Tools Association Cranfield University Engineering Employers Federation Gauge and Tool Makers Association Health and Safety Executive Institution of Electrical Engineers Machine Tool Technologies Association Co-opted members Amendments issued since publication Amd. No.DateCom
5、ments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 230-4:1996 BSI 11-1998i Contents Page Committees responsibleInside front cover National forewordi Forewordii Text of BS ISO 230-4 1 Licensed Copy: sheffieldun sheffieldun, na, Sun
6、Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 230-4:1996 ii BSI 11-1998 National foreword This Part of BS ISO 230 reproduces verbatim ISO 230-4:1996 and implements it as the UK national standard. This British Standard is published under the direction of the Engineering Sector Boa
7、rd whose Technical Committee MTE/1 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and
8、 promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards
9、 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 front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 14 and a back co
10、ver. 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. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffi
11、eldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 230-4:1996 ii Contents Page Forewordiii 1Scope1 2Normative references1 3Definitions1 4Test conditions3 5Test procedure3 6Presentation of results4 7Points to be agreed between supplier/manufacturer and user4
12、Annex A (informative) Differences between circular deviation G and radial deviation8 Annex B (informative) Influences of typical machine deviations on circular paths9 Annex C (informative) Adjustment of diameter and contouring feed13 Annex D (informative) Bibliography14 Figure 1 Evaluation of circul
13、ar hysteresis H2 Figure 2 Evaluation of circular deviation G2 Figure 3 Evaluation of radial deviation F3 Figure 4 Example of data presentation for circular hysteresis H5 Figure 5 Example of data presentation for circular deviation G6 Figure 6 Example of data presentation for radial deviation F7 Figu
14、re B.1 Influence of short and long movements of an axis on circular paths9 Figure B.2 Influence of non-perpendicularity of axes on circular paths10 Figure B.3 Influence of periodic deviations of Z10 Figure B.4 Non-Compensated reversal error11 Figure B.5 Compensated reversal error11 Figure B.6 Influe
15、nce of acceleration of axes12 Figure B.7 Influence of different following errors12 Table A.18 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 230-4:1996 BSI 11-1998iii Foreword ISO (the International Organization for Standardization)
16、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 established has the right to be repres
17、ented 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 standardization. Draft International Standard
18、s 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 230-4 was prepared by Technical Committee ISO/TC 39, Machine tools, Subcom
19、mittee SC 2, Test conditions for metal cutting machine tools. ISO 230 consists of the following parts, under the general title Test code for machine tools: Part 1: Geometric accuracy of machines operating under no-load or finishing conditions; Part 2: Determination of accuracy and repeatability of p
20、ositioning of numerically controlled machine tools; Part 3: Evaluation of thermal effects; Part 4: Circular tests for numerically controlled machine tools; Part 5: Noise emissions. Annexes A to D of this part of ISO 230 are for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26
21、 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 230-4:1996 BSI 11-19981 1 Scope This part of ISO 230 specifies methods of testing and evaluating the circular hysteresis and
22、 the circular and radial deviation of circular paths that are produced by the simultaneous movements of two linear axes. Relevant measuring instruments are described in 6.63 of ISO 230-1:1996. The objective of this part of ISO 230 is to provide a method for the measurement of the contouring performa
23、nce of a numerically controlled machine tool. 2 Normative references The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 230. At the time of publication, the edition indicated was valid. All standards are subject to revision, an
24、d parties to agreements based on this part of ISO 230 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 230-1:1996, Test code for machine tools P
25、art 1: Geometric accuracy of machines operating under no-load or finishing conditions. 3 Definitions For the purposes of this part of ISO 230 the following definitions apply: 3.1 nominal path numerically controlled and programmed circular path defined by its diameter (or radius), the position of its
26、 centre and its orientation in the working zone of the machine tool and which may be either a full circle or a partial circle of at least 90 3.2 actual path path produced by the machine tool when programmed to move on the nominal path 3.3 circular hysteresis, H maximum radial difference between two
27、actual paths, where one path is carried out by a clockwise contouring motion and the other one by an anticlockwise contouring motion (see Figure 1) NOTE 1The reference for evaluation is the centre of the least squares circle of the two actual paths. 3.4 circular deviation, G minimum radial separatio
28、n of two concentric circles enveloping the actual path (minimum zone circles) as shown in Figure 2 and which may be evaluated as the maximum radial range around the least squares circle NOTE 2Circular deviation does not include set-up errors, i.e. centring errors of the measuring instrument. NOTE 3C
29、ircular deviation measurement does not require test equipment with calibrated length whereas radial deviation (3.5) does need that facility. For differences between the circular deviation g and the radial deviation f see annex A. NOTE 4A line situated in a plane is said to be circular when all its p
30、oints are contained between two concentric circles whose radial separation does not exceed a given value (see Figure 2 and also 6.61 of ISO 230-1:1996). 3.5 radial deviation, F deviation between the actual path and the nominal path, where the centre of the nominal path is obtained either, a) from th
31、e centring of the measuring instruments on the machine tool, or b) from the least squares centring analysis for a full circle only. NOTE 5Positive deviations are measured away from the centre of the circle and negative ones towards the centre of the circle (see Figure 3). The radial deviation is giv
32、en by the maximum value, Fmax, and the minimum value, Fmin. NOTE 6Set-up errors may be included in the radial deviation F; this is applicable only to a) above. NOTE 7For differences between the radial deviation F and the circular deviation g see annex A. 3.6 identification of axes designation of the
33、 axes which are moved to produce the actual path 3.7 sense of contouring (clockwise or anticlockwise contouring, for circular deviation G and radial deviation F). Sense indicated by the sequence of the indices which identify the axes moved when the movement is from the axis positive part indicated b
34、y the first index to the axis positive part indicated by the second index; e.g. the circular deviation G produced by the X and Y axes in a clockwise movement is denoted as GYX, in an anticlockwise movement as GXY Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontr
35、olled Copy, (c) BSI BS ISO 230-4:1996 2 BSI 11-1998 Figure 1 Evaluation of circular hysteresis H Figure 2 Evaluation of circular deviation G Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 230-4:1996 BSI 11-19983 4 Test conditions 4.1
36、 Environment Where the temperature of the environment can be controlled it shall be set at 20 C. Otherwise the output of the measuring instrument and the machine nominal readings shall be adjusted to yield results corrected to 20 C (for radial deviation measurements only). The machine and, if releva
37、nt, the measuring instrument, shall have been in the test environment long enough (preferably overnight) to have reached a thermally stable condition before testing. They shall be protected from draughts and external radiation such as sunlight, overhead heaters, etc. 4.2 Machine to be tested The mac
38、hine shall be completely assembled and fully operational. All necessary levelling operations and functional checks shall be completed before starting the tests for circular hysteresis and circular and radial deviation. All circular tests shall be carried out with the machine in the unloaded conditio
39、n, i.e. without a workpiece. 4.3 Machine warm-up The tests shall be preceded by an appropriate warm-up procedure as specified by the manufacturer of the machine and/or agreed between the supplier/manufacturer and the user. If no other conditions are specified, the preliminary movements shall be rest
40、ricted to only those necessary to set up the measuring instrument. 4.4 Test parameters Parameters of the test are: a) diameter (or radius) of the nominal path; b) contouring feed; c) contouring direction (clockwise or anticlockwise) as indicated according to 3.7; d) machine axes moved to produce the
41、 actual path; e) location of the measuring instrument in the machine tool working zone; f) temperature (environment temperature, measuring instrument temperature, machine temperature) for radial deviation measurement only; g) data acquisition method (data capture range if different from 360, startin
42、g and stop points of the actual movement, number of measuring points taken for digital data acquisition, and whether a data smoothing process is applied or not); h) any machine compensation routines used during the test cycle; i) positions of slides or moving elements on the axes which are not being
43、 tested. 4.5 Test instrument calibration For the checking of radial deviation the reference dimension of the test instrument shall be known. 5 Test procedure To determine circular hysteresis, H, two actual paths have to be measured consecutively: one in a clock-wise contouring direction and the othe
44、r in an anti-clockwise contouring direction. All measured data corresponding to the actual path (including any peaks at reversal points) shall be used in the evaluation. NOTE 8For radial deviation, F, of a partial circle, set-up errors should be minimized. Figure 3 Evaluation of radial deviation F L
45、icensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:15:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 230-4:1996 4 BSI 11-1998 6 Presentation of results A graphical method of presenting results is preferred with the following test result data specified numerically: a) circular hysteresis,
46、 H; b) circular deviations G, for clockwise and anticlockwise contouring; c) radial deviations, Fmax and Fmin, for clockwise and anticlockwise contouring, corrected to 20 C. Typical examples of presentation of test results are shown in Figure 4, Figure 5 and Figure 6. The test report shall give the
47、following: date of test; name of machine; measuring equipment; test parameters (see 4.4). Magnification scale of the graphical presentation shall be stated. 7 Points to be agreed between supplier/manufacturer and user The points to be agreed between the supplier/manufacturer and the user are as foll
48、ows: a) warm-up procedure prior to testing the machine (see 4.3); b) test parameters (see 4.4); c) which test result data for the circular hysteresis H, the circular deviation G and/or the radial deviation F from 6a), 6b), 6c) are required and shall be presented. Date of test: yy/mm/ddName of machin
49、e: xyz Measuring instrument: abc Test parameters diameter of nominal path:40 mm contouring feed:500 mm/min contouring direction: machine axes under test (X, Y, Z):XY Location of measuring instrument centre of circle (X/Y/Z): 250/250/100 mm offset to tool reference (X/Y/Z): 0/0/ 80 mm offset to workpiece reference (X/Y/Z): 0/0/30 mm Data acquisition method starting point:4th quadrant stop point:4th quadrant number of measuring points (digital only): 1 500 data smoothing process: none Compensat
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