1、BRITISH STANDARD BS ISO 5744:2004 Pliers and nippers Methods of test ICS 25.140.30 BS ISO 5744:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 9 December 2004 BSI 9 December 2004 ISBN 0 580 45038 4 National foreword This British Standard
2、 reproduces verbatim ISO 5744:2004 and implements it as the UK national standard. It supersedes BS 3087-4:1988 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee MTE/15, Hand tools, to Subcommittee MTE/15/13, Assembly tools for screws and nuts, pliers an
3、d nippers, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the
4、 section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applicati
5、on. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monito
6、r related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 12, an inside back cover and a back cover. The BSI copyright notice displayed in this documen
7、t indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 5744:2004(E) OSI 4002INTERNATIONAL STANDARD ISO 5744 Third edition 2004-09-15 Pliers and nippers Methods of test Pinces et tenailles Mthodes dessai BSISO5744:2004IS:4475 O40
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13、s Page Foreword iv 1 Scope 1 2 Normative references. 1 3 General. 1 4 Load test 1 4.1 General. 1 4.2 Pliers and nippers. 1 4.3 Lever-assisted pliers 2 4.4 Test piece. 2 5 Wire cutting test 5 5.1 Verification of test wire. 5 5.2 Cutting force 5 5.3 Cutting test 6 6 Torsion test 8 6.1 General. 8 6.2 T
14、est piece. 8 7 Soft wire cutting test. 10 8 Hardness of gripping surfaces 11 Bibliography . 12 BSISO5744:2004IS:4475 O4002(E) iv I SO 4002 All irthgs ersedevrForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).
15、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 represented on that committee. International organizations, governmental and non-g
16、overnmental, 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2
17、. The main task of technical committees is to prepare International Standards. Draft International Standards 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
18、vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 5744 was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC 10, Assemb
19、ly tools for screws and nuts, pliers and nippers. This third edition cancels and replaces the second edition (ISO 5744:1988) which has been technically revised. BSISO5744:2004INTENRATIONAL TSANDADR IS:4475 O4002(E)I SO 4002 All irthgs ersedevr 1Pliers and nippers Methods of test 1 Scope This Interna
20、tional Standard specifies methods of test for checking the correct functioning of pliers and nippers. The test parameters have been specified on the basis of the functional uses of the tools. 2 Normative references The following referenced documents are indispensable for the application of this docu
21、ment. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12166:1988, Copper and copper alloys Wire for general purposes IEC 60317-0-1, Specifications for particular types of winding wires
22、Part 0-1: General requirements Enamelled round copper wire 3 General Unless otherwise specified, values like dimensions used for positioning a test piece, test forces and locations for applying test forces have a tolerance of 2,5 %. 4 Load test 4.1 General The test shall be carried out using suitabl
23、e equipment which can be checked by comparison with a standard. All tests shall be executed on the same tested tool and in the sequence of tests specified in this International Standard. 4.2 Pliers and nippers For the type and size of tool, given in the dimensional standards, define a point for the
24、application of the load on the handles at distance l 1from the centre of the joint rivet, and insert a suitable test piece into the jaws (see 4.4). If a pair of pliers is fitted with a comfort grip, the test shall preferably be carried out with the comfort grip removed. Apply a load of 50 N and meas
25、ure the width, w 1 , of the handles. Increase the load to the specified value, F, as given in the tables of the applicable product standard, and then reduce it to 50 N. The load F shall be applied four times and then the width, w 2of the handles shall again be measured at the same distance l 1 . BSI
26、SO5744:2004IS:4475 O4002(E) 2 I SO 4002 All irthgs ersedevrThe difference between the first and second readings shall not exceed the maximum value of permanent set (s = w 1 w 2 ), see Figures 1, 2, 3 and 4, appropriate to the type and size of tool. After the test, the tool shall show no deformation
27、that can affect its use. If the load test cannot conveniently be carried out at distance l 1from the centre of the joint rivet, then a more suitable position for the load may be chosen at distance 1 l from the centre of the joint rivet. The load F at distance 1 l from the centre of the joint rivet s
28、hall then be calculated from the formula 1 1 F l F l = where F is the load at distance l 1(see Figures 1, 2 and 3); F is the calculated load at distance 1 l ; l 1is the distance from the centre of the joint rivet to the point of application of the load given in the applicable product standard; 1 l i
29、s the measured distance from the centre of the joint rivet to the point of application of the load. After the load test, the permanent set, s, shall not exceed the value given in the applicable product standard. 4.3 Lever-assisted pliers For the type and size of tool, given in the dimensional standa
30、rds, define a point for the application of the load on the handles at distance l 1from the centre of the joint rivet, and insert a suitable test piece into the jaws (see 4.4). Apply a load of 0,5 F; reduce it to 50 N and measure the width, w 1 , of the handles. Increase the load to the specified val
31、ue F, and then reduce it to 50 N. The load F shall be applied four times and then the width, w 2 , of the handles shall again be measured at the same distance l 1 . The difference between the first and second readings shall not exceed the maximum value of permanent set (s = w 1 w 2 ), see Figures 1,
32、 2 and 3, appropriate to the type and size of tool. After the test, the tool shall show no deformation that can affect its use. 4.4 Test piece The test piece shall have a hardness value of 30 HRC to 40 HRC and be of such a size and profile as to make contact with the jaws over a length of 8 mm 1 mm
33、from the point of the jaws. For end cutting nippers the test piece shall make contact over the full length of the jaws. With the test piece inserted, the gap between the points of the jaws shall be 3 mm 1 mm. For multiple slip joint pliers and slip joint pliers the contact between the jaws and the t
34、est piece shall extend over lengths of 6 mm 1 mm. BSISO5744:2004IS:4475 O4002(E) I SO 4002 All irthgs ersedevr 3Dimensions in millimetres Key 1 joint rivet 2 test piece aF = load applied in load test or F 1= force applied in cutting test. bor w 2measured in accordance with 4.2. Figure 1 Diagonal cut
35、ting nippers Dimensions in millimetres Key 1 joint bolt 2 test piece aF = load applied in load test or F 1= force applied in cutting test. bor w 2measured in accordance with 4.2. Figure 2 Snipe nose, flat nose and round nose pliers BSISO5744:2004IS:4475 O4002(E) 4 I SO 4002 All irthgs ersedevrKey 1
36、joint rivet 2 test piece aF = load applied in load test or F 1= force applied in cutting test. bor w 2measured in accordance with 4.2. Figure 3 End cutting nippers Dimensions in millimetres Key 1 joint bolt 2 test piece aF = load applied in load test. bor w 2measured in accordance with 4.2. Figure 4
37、 Multiple slip joint pliers BSISO5744:2004IS:4475 O4002(E) I SO 4002 All irthgs ersedevr 55 Wire cutting test 5.1 Verification of test wire The wire to be used for cutting tests shall first be verified using equipment that can be checked by comparison with a standard. Assemble in the test equipment
38、two tungsten carbide cutters, with edges ground to an inclusive angle of 60 1 having a radius of 0,3 mm 0,02 mm, with the cutting edges parallel to each other and at right angles to the test wire (see Figure 5). Record the force required to cut the wire. The mean of three readings shall correspond t
39、o the values given in Tables 1 and 2. Key 1 test wire 2 carbide cutter Figure 5 Test equipment 5.2 Cutting force The cutting force values are given in Tables 1 and 2. Table 1 Medium hard test wire Nominal wire diameter d Approximate tensile strength aCutting force F 2mm MPa N 1,6 1 600 1 800 90 aThe
40、 tensile strength is given for guidance only. BSISO5744:2004IS:4475 O4002(E) 6 I SO 4002 All irthgs ersedevrTable 2 Hard test wire Nominal wire diameter d Approximate tensile strength aCutting force F 2mm MPa N 1,25 2 300 2 000 100 1,4 2 250 2 350 125 1,6 2 200 2 800 150 1,8 2 150 3 400 175 2 2 100
41、4 000 200 2,5 2 000 5 700 300 aThe tensile strength is given for guidance only. 5.3 Cutting test 5.3.1 General Calibrated test wire shall be used and the tool shall be placed in test equipment that can be checked by comparison with a standard. Insert the test wire into the jaws of the tool and apply
42、 the force F 1to the handles at the points defined by l 1and l 2according to the size and type of tool. For end cutting nippers, the test shall be carried out at a distance of 3 mm from the extremity of the cutting edge. NOTE l 2is the distance from the centre of the rivet to the location of the cen
43、tre of the wire. It is given in each product standard. If the wire cutting test cannot conveniently be carried out at the points defined by l 1and l 2then more suitable positions may be chosen defined by 1 l and 2 . l 5.3.2 Medium hard test wire In this case the cutting force 1 F shall be calculated
44、 using the formula 22 1 1 1,6 F l F l = where 1 F is the maximum calculated cutting force not given in the applicable product standards; F 2is the cutting force according to Table 1; 1,6 is the correction factor for medium hard test wire; 1 l is the measured distance from the centre of the joint riv
45、et to the point of application of the load; 2 l is the measured distance from the centre of the joint rivet to the location of the test wire. NOTE Lever ratio is equal to l 1 /l 2 . BSISO5744:2004IS:4475 O4002(E) I SO 4002 All irthgs ersedevr 7Measure the force, 1 , F necessary to cut the test wire,
46、 which shall not exceed the value of the maximum cutting force 1max F given for the type and size of tool. Upon completion of the test, the cutting edges shall show neither visible indentation nor distortion that would affect the cutting performance of the tool. Nor shall the tool show any damage th
47、at can affect its use. After this test, a soft wire cutting test shall be completed in accordance with Clause 7. 5.3.3 Hard test wire In this case the cutting force 1 F shall be calculated using the formula 22 1 1 2 F l F l = where 1 F is the maximum calculated cutting force not given in the applica
48、ble product standards; F 2is the cutting force according to Table 2; 2 is the correction factor for hard test wire; 1 l is the measured distance from the centre of the joint rivet to the point of application of the load; 2 l is the measured distance from the centre of the joint rivet to the location
49、 of the test wire. NOTE Lever ratio is equal to l 1 /l 2 . Measure the force 1 F necessary to cut the test wire, which shall not exceed the value of the maximum cutting force 1max F given for the type and size of tool. Upon completion of the test, the cutting edges shall show neither visible indentation nor distortion that would affect th
