1、BRITISH STANDARD BS4656-18: 1981 Incorporating Amendment No.1 Accuracy of machine tools and methods of test Part18: Specification for broaching machines, horizontal internal type UDC 621.9.01187.001.4:621.919BS4656-18:1981 This British Standard, havingbeen prepared under thedirection of the Mechanic
2、al Engineering Standards Committee, was published underthe authority of the Executive Board and comes intoeffect on 31 August1981 BSI 10-1999 First published October 1973 First revision August 1981 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for
3、comment79/70995DC ISBN 0 580 12300 6 Cooperating organizations The Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Associated Offices Technical Committee Department of Trade (Marine Division) Associ
4、ation of Consulting Engineers Department of Transport Association of Hydraulic Equipment Electricity Supply Industry in England and Manufacturers Wales Association of Mining Electrical and Engineering Equipment Users Association Mechanical Engineers Federation of Manufacturers of Construction Britis
5、h Compressed Air Society Equipment and Cranes British Electrical and Allied Manufacturers Health and Safety Executive Association (BEAMA) Institution of Gas Engineers British Gas Corporation Institution of Mechanical Engineers* British Gear Manufacturers Association Institution of Plant Engineers Br
6、itish Internal Combustion Engine Institution of Production Engineers* Manufacturers Association Lloyds Register of Shipping British Pump Manufacturers Association London Transport Executive British Steel Corporation Machine Tool Industry Research Association* British Steel Industry Ministry of Defen
7、ce* Cbmpe National Coal Board Chartered Institution of Building Services Oil Companies Materials Association Crown Agents for Oversea Governments and Process Plant Association Administrations Railway Industry Association of Great Britain Department of Industry (Mechanical Society of Motor Manufactur
8、ers and Traders Engineering)* Limited Department of Industry (National Engineering Telecommunication Engineering and Laboratory) Manufacturing Association (TEMA) Department of the Environment Water-tube Boilermakers Association The organizations marked with an asterisk in the above list, together wi
9、th the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Ball and Roller Bearing Manufacturers University of Aston in Birmingham Association University of Manchester (Institute of Science Department of the Environment (PSA) and T
10、echnology) Federation of British Engineers Tool Individual experts Manufacturers Amendments issued since publication Amd. No. Date of issue Comments 5808 October 1988 Indicated by a sideline in the marginBS4656-18:1981 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover Foreword
11、 ii 1 Scope 1 2 References 1 3 Application of test methods 1 4 Abbreviations 1 5 Diagrams 1 Appendix A Terminology for broaching machines, horizontal internal type 6 Figure 1 Broaching machine, horizontal internal type 6 Table 1 Geometrical tests for broaching machines, horizontal internal type 2 Ta
12、ble 2 Terminology for broaching machines horizontal internal type: multi-language 6 Publications referred to Inside back coverBS4656-18:1981 ii BSI 10-1999 Foreword This Part of this British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee and implemen
13、ts agreements of the International Organization for Standardization (ISO). It is a revision of the1973 edition which is therefore withdrawn. Because of the diversity of shape of test pieces, practical tests have not been included. This Part of this standard is generally in accordance with ISO6480:19
14、83 “Conditions of acceptance for horizontal internal broaching machines Testing of the accuracy”. It differs from ISO6480 in the following respects. Clauses. Clauses1, 3 and4 contain the same information as is given in ISO6480 but they are expressed in accordance with an accepted format that has bee
15、n adopted for the BS4656 series of standards. Clause5 has been added. Inch dimensions. In accordance with the United Kingdom policy of metrication, inch dimensions given in ISO6480 have not been included in this British Standard. Tables and tests. In column6 of Table 1, reference to ISO/R230 “Machin
16、e tool test code” has been replaced by reference to BS3800. In test G0, in column6 the note is different from that in ISO6480 which was rather vague. In test G2, the permissible deviation is the same as that given in Part18:1973 which the United Kingdom wishes to maintain. ISO6480 gives a wider tole
17、rance than this. In test G3, the diagram from Part18:1973 has been retained because it illustrates a more sensible way of carrying out the test. The permissible deviation is also the same as that in the 1973 edition of this standard. ISO6480 gives a wider tolerance and thus reduces the quality of ma
18、chine. In test G5, the method of expressing the permissible deviation has been clarified but the numerical value is effectively the same as ISO6480. In the observations column, reference to the dial gauge being turned through360 around the centre hole has been deleted to avoid confusion. In test G6,
19、 the method shown in Part18:1973 has been added as an alternative test as this is equally acceptable technically. The method of expressing the permissible deviation is more correct than that used in ISO6480. The designation and description of types1 and2 have been added for clarification. This test
20、has been divided into G6.1 and G6.2. Appendix. In term no.5, the English language version has been amended to read “Mounting for face plate”. In UK practice this is not normally a separate feature but is part of the bed casting. A British Standard does not purport to include all the necessary provis
21、ions 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 front cover, pagesi andii, pages1 to6, an insi
22、de back cover 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.BS4656-18:1981 BSI 10-1999 1 1 Scope This Part of this British Standard specifies, with reference to B
23、S3800, geometrical tests for broaching machines, horizontal internal type and gives corresponding permissible deviations which apply. This standard is applicable to machines of general purpose use and normal accuracy. It deals only with the verification of accuracy of the machine. It does not apply
24、to the testing of the running of the machine (vibrations, abnormal noises, stick-slip motion of components etc.) nor to its characteristics (speeds, feeds, etc.) which should generally be checked before testing accuracy. 2 References The titles of the publications referred to in this standard are li
25、sted on the inside back cover. 3 Application of test methods 3.1 In applying the tests detailed in Table 1, reference should be made to BS3800, especially concerning the installation of the machine before testing, warming up of moving parts, the description of measuring methods and the recommended a
26、ccuracy of testing equipment. 3.2 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 listed in Table 1 is related to the sub-assemblies of the machine and it is not intended to impos
27、e the practical order in which the tests are to be done. 3.3 It is not always necessary for all the tests specified in this 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.
28、 The appropriate tests are to be clearly stated when the machine is ordered. 3.4 When establishing the tolerance for a measuring range different from that given in this standard (see2.311 of BS3800:1964), it should be taken into consideration that the minimum value of tolerance is0.01mm for geometri
29、cal tests. 4 Abbreviations For the purposes of this standard, various methods of expressing permissible deviations are employed, each having a particular type of application. The methods employed are as follows. 5 Diagrams For reasons of simplicity the diagrams in this standard illustrate only one t
30、ype of machine. -/- This type of expression applies to deviations of perpendicularity that are ratios. - for any length of - 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. -
31、 per - This type of expression applies to deviations of straightness and parallelism and is used to recommend a measurement length, but in this case the proportionality rule comes into operation if the measurement length differs from that indicated.BS 4656-18:1981 2 BSI 10-1999 Table 1 Geometrical t
32、ests for broaching machines, horizontal internal type All dimensions are in millimetres. 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the test code BS3800:1964 G0 Checking of levelling of the pull block ways: (a) longitudinal verification
33、(b) transverse verification (a) and (b) 0.05/1 000 Level and special support 3.11 The level shall be placed in positions a) and b), and the deviation observed; for the two tests of G0, the deviations shall be in the same direction NOTEThis test should be carried out only when instructions on levelli
34、ng have not been provided by the manufacturer Checking of levelling of the outer support ways: (a) longitudinal verification (b) transverse verification (a) and (b) 0.1/1000BS 4656-18:1981 BSI 10-1999 3 Table 1 Geometrical tests for broaching machines, horizontal internal type All dimensions are in
35、millimetres. 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the test code BS3800:1964 G1 Checking of flatness of the face plate: (a) in a vertical plane (b) in a horizontal plane (a) and (b) 0.025 up to300 0.025 for each additional 300 up to
36、 a maximum of0.05 (a) Box spirit level or straightedge and gauge blocks ( b) Dial gauge and special support or straightedge and gauge blocks 5.322 and 5.323 a) The box spirit level shall be placed successively at a number of positions equally spaced along the face plate, and the deviation observed b
37、) The special support shall be placed in the upper, mid- and lower positions on the face plate. The dial gauge shall be moved on the special support in a horizontal plane, and the deviation observed G2 Checking of parallelism of the pulling chuck hole axis to its movement: (a) in a vertical plane (b
38、) in a horizontal plane (a) and (b) 0.015per300 Test mandrel and dial gauge 5.422.21 Pulling chuck extended The dial gauge shall be fixed to a fixed part of the machine. The pulling chuck shall be moved and any horizontal or vertical deviation notedBS 4656-18:1981 4 BSI 10-1999 Table 1 Geometrical t
39、ests for broaching machines, horizontal internal type All dimensions are in millimetres. 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring instruments Observations and references to the test code BS3800:1964 G3 Checking of squareness of the movement of the pulling chuck to the face plat
40、e: (a) in a vertical plane (b) in a horizontal plane (a) and (b) 0.025/300 Square and dial gauge 5.522.2 The dial gauge shall be fixed to the pulling chuck and the square to the face plate; the pulling chuck shall be moved with the dial gauge along the square and any horizontal or vertical deviation
41、 noted G4 Checking of squareness of the movement of the retriever chuck to the face plate: ( a) in a vertical plane (b) in a horizontal plane (a) and (b) 0.075/300 Dial gauge and special square 5.522.2 The dial gauge shall be fixed on the retriever chuck. The special square shall be placed against t
42、he face plate The retriever chuck shall be moved and any horizontal or vertical deviation noted G5 Checking of coincidence of the pulling chuck hole axis with the central hole axis of the face plate 0.025 (0.05FIM) Test mandrel and dial gauge 5.44 Pulling chuck in starting position The dial gauge sh
43、all be set to swivel on the test mandrel, and the test mandrel shall be fixed to the pulling chuckBS 4656-18:1981 BSI 10-1999 5 Table 1 Geometrical tests for broaching machines, horizontal internal type All dimensions are in millimetres. 1 2 3 4 5 6 No. Diagram Object Permissible deviation Measuring
44、 instruments Observations and references to the test code BS3800:1964 G6.1 Type1. Retriever chuck supports broach through most of cycle. This test is not necessary when the retriever serves only a broach handling function Checking of alignment of the retriever chuck hole axis with the pulling chuck
45、hole axis: (a) in a vertical plane (b) in a horizontal plane (a) and (b) 0.06per500 Test mandrel of length1000and dial gauge 5.43 and5.44 The test mandrel shall be fixed in the retriever chuck hole and in the pulling chuck hole The plunger of the dial gauge shall touch the test mandrel. The retrieve
46、r chuck hole and pulling chuck hole shall be moved and any horizontal or vertical deviation noted G6.2 Alternative test Type2. Retriever chuck is only in contact when retrieving or inserting the broach. Checking of alignment of the pulling chuck and retriever chuck axes: (a) in a vertical plane (b)
47、in a horizontal plane (a) and (b) 0.075per300 Test mandrel of length1000and dial gauge Pulling chuck at the beginning of its travel, and the retriever chuck as close as possible to it. The dial gauge shall be mounted on the ways and the plunger shall touch the test mandrel. The dial gauge shall be m
48、oved along the waysBS4656-18:1981 6 BSI 10-1999 Appendix A Terminology for broaching machines, horizontal internal type Table 2 Terminology for broaching machines, horizontal type: multi-language (see Figure 1) Figure 1 Broaching machine, horizontal internal typeBS4656-18:1981 BSI 10-1999 Publicatio
49、ns referred to BS3800, Methods for testing the accuracy of machine tools. ISO/R 230, Machine tool test code. ISO6480, Conditions of acceptance for horizontal internal broaching machines Testing of the accuracy. BS4656-18: 1981 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updat
