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1、BRITISH STANDARD BS 7568-9: 1992 ISO 8978:1987 Press tools Part 9: Guides for round punches Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:35:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7568-9:1992 This British Standard, having been prepared under the d
2、irection of the Machine, Engineers and Hand Tools Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 1 May 1992 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference MTE/12 Draft for comment 86/709
3、14 DC ISBN 0 580 20775 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machine, Engineers and Hand Tools Standards Policy Committee (MTE/-) to Technical Committee MTE/12, upon which the following bodies were represented: Advanced Manuf
4、acturing Technology Research Institute Amalgamated Engineering Union Gauge and Tool Makers Association Coopted member Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:35:23 GMT+00:00 2006, Uncontrolled C
5、opy, (c) BSI BS 7568-9:1992 BSI 09-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope and field of application1 2References1 3Dimensions1 4Material and hardness1 5Designation1 Figure1 Table2 Publication(s) referred toInside back cover Licensed Copy: London South
6、Bank University, London South Bank University, Fri Dec 08 11:35:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7568-9:1992 ii BSI 09-1999 National foreword This Part of BS 7568 has been prepared under the direction of the Machine, Engineers and Hand Tools Standards Policy Committee. It is identica
7、l with ISO 8978:1987 “Tools for pressing Guides for round punches”, prepared by Technical Committee ISO/TC 29, Small tools, and published by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO 4957:1980, to which normative reference is
8、 made in the text, and has decided that they are acceptable for use in conjunction with this standard. 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 Standa
9、rd does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 6508:1986BS 891:1989 Methods for hardness test (Rockwell method) and for verification of hardness testing machines (Rockwell method) (Technically equivalent) ISO 80
10、21:1986BS 7568 Press tools Part 6:1992 Round punches with cylindrical head and straight shank (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright
11、 date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:35:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7568-9:1992 BSI 09-19991 1 Scope and
12、field of application This International Standard lays down the basic dimensions and tolerances in millimetres of guides for round punches. It gives examples of materials and hardness, and specifies a designation of guides for round punches which meet the requirements of this International Standard.
13、The main use of guides for round punches defined in this International Standard is for punching holes in steel sheet. They may also be used for punching holes in other materials. 2 References ISO 4957, Tool steels. ISO 6508, Metallic materials Hardness test Rockwell test (scales A B C D E F G H K).
14、ISO 8021, Round punches with cylindrical head and straight shank. 3 Dimensions See the Figure and the Table. 4 Material and hardness The material is left to the manufacturers discretion. The following hardness values are given as examples: a) Tool steel with 5 to 12 % Cr: 62 2 HRC b) High-speed stee
15、l: 64 2 HRC 5 Designation A guide for round punches in accordance with this International Standard shall be designated by a) “Guide for round punches”; b) reference to this International Standard; c) its external diameter, D; d) its internal diameter, d. Example: The designation for a guide for roun
16、d punches of external diameter D = 5 mm and internal diameter d = 1 mm is as follows: Guide for round punches ISO 8978 5 1 Figure Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:35:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7568-9:1992 2 BSI 09-1999 Tab
17、le D n6 da H6 Lr 51; .; 2,481 61,6; .; 312,51 82; .; 3,512,51,5 103; .; 5162 134; .; 7,2162 166; .; 8,8202 207,5; .; 11,3202,5 2511; .; 16,6252,5 3215; .; 20254 4018; .; 27324 5026; .; 36404 a Increment = 0,1 mm. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 1
18、1:35:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7568-9:1992 BSI 09-1999 Publication(s) referred to See national foreword. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:35:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7468-9: 1992 ISO 8978:1987 BSI
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