1、BRITISH STANDARD BS EN 27931:1992 ISO7931:1985 Specification for Insulation caps and bushes for resistance welding equipment The European Standard EN27931:1992 has the status of a BritishStandardBSEN27931:1992 This BritishStandard, having been prepared under the directionof the Welding Standards Pol
2、icy Committee, waspublished under the authorityof the Standards Board and comes into effect on 15July1992 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference WEE/26 Draft for comment83/80092 DC ISBN 0 580 20611 4 Cooperating organizations The European Com
3、mittee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suom
4、en Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazi
5、one Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association
6、suisse de normalisation United Kingdom BritishStandards Institution Amendments issued since publication Amd. No. Date CommentsBSEN27931:1992 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN27931 3 National annex NA (informative) Comm
7、ittees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN27931:1992 ii BSI 12-1999 National foreword This BritishStandard has been prepared under the direction of the Welding Standards Policy Committee and is the English language version of EN27931:1
8、992 “Insulation caps and bushes for resistance welding equipment”, published by the the European Committee for Standardization (CEN). It supersedes BS4215-8:1987 which is withdrawn. EN27931 was produced as a result of international discussion in which the UK took an active part. A British Standard d
9、oes 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 comprises a front cover, an in
10、side front cover, pagesi andii, theEN title page, pages2 to4, an inside 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.EUROPEAN STANDARD NORME EUROPENNE
11、 EUROPISCHE NORM EN27931 May1992 UDC 621.791.76.039:621.315.62 Descriptors: Welding, resistance welding, welding equipment, insulated bushes, insulating caps, dimensions, designation, marking English version Insulation caps and bushes for resistance welding equipment (ISO7931:1985) Capuchons et bagu
12、es isolantes pour les matriels pour soudage par rsistance (ISO7931:1985) Isolierkappen und -buchsen fr Widerstandsschweieinrichtungen (ISO7931:1985) This European Standard was approved by CEN on1992-05-22. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
13、conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in t
14、hree official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of
15、Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat
16、: rue de Stassart 36, B-1050 Brussels 1992 Copyright reserved to CEN members Ref. No. EN27931:1992 EEN27931:1992 BSI 12-1999 2 Foreword In September1991, CEN Technical Board decided to submit the International Standard ISO7931:1985 “Insulation caps and bushes for resistance welding equipment” to the
17、 formal vote procedure. The result was positive and the standard is now adopted as a European Standard. National standards identical to this European Standard shall be published at the latest by1992-11-30 and conflicting national standards shall be withdrawn at the latest by1992-11-30. According to
18、the CEN/CENELEC Common Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and United Kingdom. Endorsement notice The
19、 text of the International Standard ISO7931:1985 was approved by CEN as a European Standard without any modification. Contents Page Foreword 2 1 Scope and field of application 3 2 References 3 3 Dimensions 3 4 Application 4 Figure 1 Insulation cap 3 Figure 2 Insulation bush 3 Figure 3 Typical exampl
20、e of application 4 Table Dimensions 3EN27931:1992 BSI 12-1999 3 1 Scope and field of application This International Standard specifies dimensions and requirements for insulated caps and bushes in the secondary circuit for resistance welding equipment, especially for use in back-ups according to ISO5
21、827. 2 References ISO887, Plain washers for metric bolts, screws and nuts General plan. ISO4762, Hexagon socket head cap screws Product grade A. ISO5827, Spot welding Electrode back-ups and clamps. 3 Dimensions 3.1 Insulation caps C Insulation caps C shall have the dimensions shown in Figure 1. 3.1.
22、1 Material The material from which the insulation caps are manufactured shall be high-strength insulating material, e.g.glass fibre reinforced polyamide. 3.1.2 Finish The finish shall ensure that the edges are chamfered and the grooves rounded. 3.1.3 Marking Insulation caps to this International Sta
23、ndard shall be marked with the letter C. 3.1.4 Designation The designation for an insulation cap C which conforms to this International Standard shall be as follows: Insulation cap ISO7931 C 3.2 Insulation bushes B Insulation bushes B shall have the dimensions given in Figure 2 and the Table. Table
24、Dimensions a 3.2.1 Material The material from which the insulation bushes and washers are manufactured shall be as follows: bush: high-strength insulating material, e.g.glass fibre reinforced polyamide; washer: steel, e.g.Fe510. 3.2.2 Finish The finish shall ensure that the edges are chamfered and t
25、he grooves rounded. 3.2.3 Marking Insulation bushes to this International Standard shall be marked with the letter B and the size, e.g.B10. Figure 1 Insulation cap Figure 2 Insulation bush Dimensions in millimetres Size d 1 b d 2 d 3 d 4 d 5 l 1 l 2 6 8 10 12 13 17 19 21 10,5 13,5 16,5 19,5 6,4 8,4
26、10,5 13 9,5 11,5 14 16 16 20 24 27 7 9 11 13 20 22 24 26 a Where the hole diameter is considerably larger than the diameter d 4or slotted holes are used, a washer is necessary to support the bush. b For information only.EN27931:1992 4 BSI 12-1999 3.2.4 Designation The designation for an insulation b
27、ush B which conforms to this International Standard shall comprise the following items in the order given: a) the name; b) the reference to this International Standard; c) the letter B; d) the size. Example of the designation for an insulation bush B of size10: Insulation bush ISO7931 B10 4 Applicat
28、ion Insulation bushes conforming to this International Standard shall only be loaded with the torque moment of the fixing screws. Additional forces shall be taken up by other measures (e.g.provision of shoulders or similar means of support). Figure 3 Typical example of applicationBSEN27931:1992 BSI
29、12-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Welding Standards Policy Committee (WEE/-) to Technical Committee WEE/26 upon which the following bodies were represented: British Non-fer
30、rous Metals Federation British Steel Industry Copper Development Association Electricity Association Institution of Incorporated Executive Engineers Society of British Aerospace Companies Limited Society of Motor Manufacturers and Traders Limited Welding Institute Welding Manufacturers Association (
31、BEAMA Ltd) Coopted members National annex NB (informative) Cross-references Publication referred to Corresponding BritishStandard a ISO887:1983 BS4320:1968 Specification for metal washers for general engineering purposes. Metric series ISO4762:1989 BS4168 Hexagon socket screws and wrench keys: Metri
32、c series Part1:1981 Specification for hexagon socket headcap screws ISO5827:1983 BS EN25827:1992 Specification for spot welding Electrode back-ups and clamps a Where no identical or technically equivalent BritishStandard exists, the user is directed to the relevant European or International Standard
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