1、BRITISH STANDARD BS 4656-34: 1985 ISO 6899: 1984 Accuracy of machine tools and methods of test Part 34: Specification for power presses, mechanical open front type ISO title: Acceptance conditions of open front mechanical power presses Testing of the accuracy UDC 621.9.01 187.001.4:621.979.63BS4656-
2、34:1985 This British Standard, having been prepared under the direction of the Mechanical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 April 1985 BSI 07-1999 The following BSI references relate to the work on this standard: Commit
3、tee reference MTE/1 (formerly MEE/6) Draft for comment 82/80283 DC ISBN 0 580 14439 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Mechanical Engineering Standards Committee (MEE/-) to Technical Committee MEE/6 upon which the followin
4、g bodies were represented: Department of Trade and Industry (Mechanical and Electrical Engineering Division) Federation of British Engineers Tool Manufacturers GAMBICA (BEAMA Ltd) Health and Safety Executive Institution of Production Engineers Machine Tool Industry Research Association Ministry of D
5、efence University of Aston in Birmingham University of Manchester Institute of Science and Technology Coopted members The following bodies were also represented in the drafting of the standard, through sub-committees and panels: Institute of Sheet Metal Engineering Metalforming Machinery Makers Asso
6、ciation Ltd. Amendments issued since publication Amd. No. Date of issue CommentsBS4656-34:1985 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 Preliminary observations 1 3 References 1 4 Test conditions and permissible t
7、olerances 1 Publications referred to Inside back coverBS4656-34:1985 ii BSI 07-1999 National foreword This Part of BS4656 has been prepared under the direction of the Mechanical Engineering Standards Committee and implements agreements of the International Organization for Standardization (ISO). It
8、is identical with ISO6899:1984 “Acceptance conditions of open front power presses Testing of the accuracy” which is based on recommendations of the European Power Press Manufacturers Panel (Secretariat, Machine Tool Industry Research Association, Macclesfield). Abbreviations. For the purposes of thi
9、s standard, various methods of expressing permissible deviations are employed, each having a particular type of application. The methods employed are as follows. Diagrams. For reasons of simplicity the diagrams in this standard illustrate only one type of machine. Terminology and conventions. The te
10、xt of the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decima
11、l marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. A British Standard does not purport to include all the necessary
12、 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. -/- This type of expression applies to deviations of perpendicularity that are ratios. -for any length of
13、- This type of expression applies to deviations of straightness and parallelism, and is used in fact for local permissible deviations, the measurement length being obligatory. -per- This type of expression applies to deviations of straightness and parallelism and is used to recommend a measurement l
14、ength, but in this case the proportionality rule comes into operation if the measurement length differs from that indicated. Cross-references International standard Corresponding British Standard ISO/R 230:1961 BS 3800:1964 Methods for testing the accuracy of machine tools (Technically equivalent) I
15、SO 6898:1984 BS 6590:1985 Specification for capacity ratings and dimensions of power presses, mechanical open front type (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has b
16、een updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS4656-34:1985 BSI 07-1999 1 1 Scope and field of application This International Standard specifies, with reference to ISO/R230, geometrical tests for ope
17、n front mechanical power presses and gives the corresponding permissible tolerances. This International Standard is applicable to machines of general purpose use and normal accuracy up to2500kN capacity which is the biggest press standardized in ISO6898. This International Standard deals only with t
18、he checking of accuracy of the machine. It does not apply to the testing of the running of the machine (vibrations, abnormal noises, stick-slip motion of components, etc.) nor to its characteristics (speeds, feeds, deflection under load, etc.) which should generally be checked before testing accurac
19、y. 2 Preliminary observations 2.1 In applying the tests detailed in Table 1 andTable 2, reference should be made to ISO/R230, especially concerning the installation of the machine before testing, warming up of moving parts, the description of measuring methods and the recommended accuracy of testing
20、 equipment. 2.2 The tests may be applied in any order that is practicable and that makes for ease of mounting of instruments or gauging. The sequence in which the geometrical tests are given is related to the sub-assemblies of the machine; it is not intended to impose the practical order in which th
21、e tests are to be carried out. 2.3 It is not always necessary for all the tests specified in this International Standard to be carried out. The purchaser shall be at liberty to select, in agreement with the manufacturer, those tests relating to the properties that are of interest to him. The appropr
22、iate tests shall be clearly stated when the machine is ordered however. 2.4 Prior to testing it is necessary to establish that the press under test is levelled correctly, that the slide balance, if fitted, is set in accordance with the manufacturers instructions, and that the testing equipment is ac
23、curate. 2.5 When establishing the tolerance for a measuring range different from that given in this International Standard (see 2.311 of ISO/R230) it should be taken into consideration that the minimum value of tolerance is0,01mm. 3 References ISO/R 230, Machine tool test code. ISO 6898, Open front
24、mechanical power presses Capacity ratings and dimensions. NOTEA future International Standard will cover terminology of open front mechanical power presses. 4 Test conditions and permissible tolerances Dimensions are expressed in millimetres, and capacity ratings in kilonewtons.BS 4656-34:1985 2 BSI
25、 07-1999 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the ISO/R 230 test code G 1 Flatness of the bedplate surface, longitudinally, transversely and diagonally 0,01 per measured length of 100 Straightedge and gauge blocks Clauses 5.3, 5.31 and 5.322 I
26、f it is intended that the press be used without a bedplate, then the same test shall be carried out on the bed. G 2 Flatness of the slide surface, longitudinally, transversely and diagonally 0,01 per measured length of 100 Straightedge and gauge blocks Clauses 5.3, 5.31 and 5.322 G 3 Parallelism of
27、the slide surface to the bedplate surface: Capacity k 630 a) 0,015 per measured length of 100 Dial gauge Clauses 5.41, 5.412.2 Slide at bottom of maximum stroke, adjustment up. In direction b) the gap between the slide surface and bedplate surface shall not be less at point A than at point B. If it
28、is intended that the press be used without a bedplate, then the same test shall be carried out on the bed. a) left to right b) front to back b)0,020 per measured length of 100 630 Capacity k 2500 a)0,020 per measured length of 100 b)0,030 per measured length of 100BS 4656-34:1985 BSI 07-1999 3 G 4 S
29、quareness of the stem hole to slide surface: a) left to right b) front to back For a) and b): 0,05/100Length of mandrel Square, feeler gauges and test mandrel G 5 Squareness of slide movement to bedplate: a) left to right b) front to back Capacity k 630 for a) and b): 0,03/100 Square and dial gauge
30、Clause 5.522.2 If it is intended that the press be used without a bedplate, then the same test shall be carried out on the bed. In direction b) the dial indicator reading at the top of the stroke can be less than that at the bottom of the stroke. 630 capacity k 2 500 for a) and b): 0,04/100 No. Diag
31、ram Object Permissible deviation Measuring instruments Observations and references to the ISO/R 230 test code4 blankBS4656-34:1985 BSI 07-1999 Publications referred to See national foreword.BS 4656-34: 1985 ISO 6899: 1984 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is
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