EN ISO 2739-2012 en Sintered metal bushings - Determination of radial crushing strength《烧结金属衬套 放射状抗碎强度的测定》.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 2739:2012Sintered metal bushings Determination of radialcrushing strength (ISO2739:2012)BS EN ISO 2739:2012 BRITISH STANDARDNational forewordThis British Standard is th

2、e UK implementation of EN ISO 2739:2012.It supersedes BS EN ISO 2739:2010 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/65, Sintered metal components.A list of organizations represented on this committee can beobtained on request to its secretary.

3、This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 71799 4ICS 21.060.60; 77.040.10; 77.160Compliance with a British Stan

4、dard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2739 July 2012 ICS 77.

5、160; 77.040.10 Supersedes EN ISO 2739:2010English Version Sintered metal bushings - Determination of radial crushing strength (ISO 2739:2012) Bagues en mtal fritt - Dtermination de la rsistance lcrasement radial (ISO 2739:2012) Buchsen aus Sintermetall - Bestimmung der radialen Bruchfestigkeit (ISO

6、2739:2012) This European Standard was approved by CEN on 16 June 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliograph

7、ical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibilit

8、y of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of

9、 Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIO

10、N EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2739:2012: EBS EN ISO 2739:2012EN ISO 2739:2012 (E) 3 Foreword This document (EN ISO 273

11、9:2012) has been prepared by Technical Committee ISO/TC 119 “Powder metallurgy“. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2013, and conflicting national standards shall be withdrawn

12、 at the latest by January 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 2739:2010. According t

13、o the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greec

14、e, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, the United Kingdom and Turkey. Endorsement notice The text of ISO 2739:2012 has been approved by CEN as a EN ISO 2739:2012 withou

15、t any modification. BS EN ISO 2739:2012ISO 2739:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees.

16、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-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Internat

17、ional 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.The main task of technical committees is to prepare International Standards. Draft International Standar

18、ds 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 vote.Attention is drawn to the possibility that some of the elements of this document may be the subject o

19、f patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 2739 was prepared by Technical Committee ISO/TC 119, Powder metallurgy, Subcommittee SC 3, Sampling and testing methods for sintered metal materials (excluding hardmetals).This third edition cancels

20、and replaces the second edition (ISO 2739:2006), which has been technically revised. ISO 2012 All rights reserved iiiBS EN ISO 2739:2012BS EN ISO 2739:2012Sintered metal bushings Determination of radial crushing strength1 ScopeThis International Standard specifies a method of measuring the radial cr

21、ushing strength of sintered metal parts in the form of hollow cylinders, commonly known as bushings.This method is applicable to sintered bushings composed of pure or alloyed metal powders.2 PrincipleA hollow cylinder is submitted to a continuously increasing radial load until breakage occurs, provi

22、ded that the deformation does not exceed 10 % of the diameter. The maximum load observed is used to calculate a value in relation to the dimensions of the hollow cylinder known as “radial crushing strength”.3 Apparatus3.1 Pressing apparatus, that enables a radial load to be applied to a hollow cylin

23、der.3.2 Load-measuring device, accurate and readable to 0,1 % of the full scale. The lowest testing range that can provide a measureable result should be used.3.3 Loading plates, two flat, ground, hardened steel plates of sufficient size to encompass the test specimen that can be fastened to the pre

24、ss platens and that will remain parallel.4 Test pieceThe test piece (see Figure 1) shall be in the form of a sintered hollow cylinder (which may or may not be oil-impregnated), without flanges, notches, grooves, pronounced chamfers, drilled holes, oilways or keyways. If necessary, the cylinder may b

25、e machined but, in this case, the results obtained may differ from those obtained with a cylinder that has not been machined.KeyL length of the hollow cylinderD external diameter of the hollow cylindere thickness of the cylinder wallFigure 1 Test pieceINTERNATIONAL STANDARD ISO 2739:2012(E) ISO 2012

26、 All rights reserved 1BS EN ISO 2739:2012ISO 2739:2012(E)5 Procedure5.1 Clean any surface oil from the specimen and measure the outside diameter, the inside diameter and the length within 0,5 % tolerance.For test specimens with an outside diameter 10 mm, the outside diameter may be measured to the n

27、earest 0,05 mm.For test specimens with an inside diameter 10 mm, the inside diameter may also be measured to the nearest 0,05 mm.For test specimens with a length ranging from 2 mm to 10 mm, the length may be measured to the nearest 0,05 mm. For test specimens with a length 2 mm, the length may be me

28、asured to the nearest 0,01 mm.5.2 Wipe the loading plates clean and lay the test specimen in the central region of the lower plate, the axis of the test specimen being parallel to the planes of the plates (see Figure 2).5.3 Bring the upper plate and the test specimen into contact and slowly apply th

29、e diametric load at a rate (platen speed) that does not exceed 5 mm/min.5.4 Record the load at which the test specimen fractures or the first reading at which the applied load drops. The measuring value of the load should be kept at 0,1 % of the total load.Key1 applied loadFigure 2 Test arrangement2

30、 ISO 2012 All rights reservedBS EN ISO 2739:2012ISO 2739:2012(E)6 Expression of resultsThe radial crushing strength of the bushing, K, in newtons per square millimetre, is given by the following equation:KFD eLe=()2whereF is the maximum load, in newtons (N), incurring fracture;L is the length, in mi

31、llimetres (mm), of the hollow cylinder;D is the external diameter, in millimetres (mm), of the hollow cylinder;e is the thickness, in millimetres (mm), of the cylinder wall.This equation is valid only if the ratio e/D is less than 1/31).7 Precision statement (Statement of accuracy)On the basis of te

32、st error alone, the difference in the absolute value of two test results obtained in the same laboratory will be expected to exceed repeatability (r) only 5 % of the time. If such a difference is found to be larger than r, there is reason to question one or both results.Similarly, the difference bet

33、ween two test results obtained in different laboratories will be expected to exceed reproducibility (R) only 5 % of the time. If the difference is found to be larger than R, there is reason to question one or both measurements.Table 1 Precision dataValues in megapascalsMaterial K r RCTG 1001 K23 (C-

34、T10G-K160)214 15 23FC 1000 K 20 400 34 45FC 0208 50 (F-08C2-340)785 48 481 MPa = 1 N/mm2NOTE With permission, this clause was taken from MPIF2)Standard 55, 1998, Determination of radial crush strength (K) of powder metallurgy test specimens.8 Test reportThe test report shall include the following in

35、formation:a) a reference to this International Standard;b) all details necessary for identification of the specimen;c) whether the specimen is as sintered or sized;d) whether the specimen has been machined or not, and, if so, a drawing showing how the specimen has been taken from the part;1) In this

36、 case, the tensile strength is approximately equal to 0,5K.2) Metal Powder Industries Federation, USA ISO 2012 All rights reserved 3BS EN ISO 2739:2012ISO 2739:2012(E)e) whether the specimen has been oil-impregnated or not;f) the result obtained, reported to the nearest 10 MPa;g) all operations not

37、specified in this International Standard, or regarded as optional;h) details of any occurrence that may have affected the result.If necessary, the data required for the identification of the test piece shall be agreed between the manufacturer and the user.4 ISO 2012 All rights reservedBS EN ISO 2739

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