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1、 STDOJIS Z 2248-ENGL L77b 4733b08 053b474 404 UDC 620.177 JIS JAPANESE INDUSTRIAL STANDARD Method of bend test for metallic materials JIS Z 2 2 4 8 - 1 9 9 6 Translated and Published bY Japanese Standards Association Printed in Japan 5 s COPYRIGHT Japanese Standards Association Licensed by Informati
2、on Handling Services COPYRIGHT Japanese Standards Association Licensed by Information Handling Services In the event of any doubt arising, the original Standard in Japanese is to be final authority Errata for JIS (English edition) are printed in Standardization Journul, published monthly by the Japa
3、nese Standards Association. Errata will be provided upon request, please contact: Business Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, JAPAN 107 TEL. 03-3583-8002 FAX. 03-3583-0462 . Errata are also provided to subscribers of JIS (English edition) in Monthly Infomat
4、ion. COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information Handling Services STD.JIS Z 2248-ENGL L77b 4733bB8 053b47b 287 UDC 620.177 JAPANESE INDUSTRIAL STANDARD J I S Method of bend test for metallic mate
5、rials Z 2248-1996 Introduction corresponding part (test method) of IS0 7438, Metallic materials - Bend test issued in 1985 as the first edition without changing the technical contents of the corresponding International Standard. This Japanese Industrial Standard was made on the basis of the . 1. Sco
6、pe test for metallic materials. This Japanese Industrial Standard specifies the method of bend Remarks 1. The following standards are cited in this Standard: JIS G 0202 JIS Z 2204 2 . The following standard is the corresponding International Standard to this Standard: IS0 7438: 1985 Glossary of term
7、s used in iron and steel (testing) Bend test pieces for metallic materials Metallic materials-Bend test 2. Definitions JIS G 0202 and the following definition apply: For the purpose of this Standard, the definitions given in testing force Force applied to test piece for the purpose of testing. COPYR
8、IGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information Handling Services STD-JIS Z 2298-ENGL L99b Li933bOB 053b977 113 2 Z 2248-1996 3. Principle of test round, square, rectangular or polygonal cross-section to d
9、eformation by bending within a specified internal radius, without changing the direction of testing force until a specified angle of bend is reached to examine whether there are cracks or other defect on the outer surface of curvature. The bend test consists in submitting a test piece of 4. Test pie
10、ce following: The test piece to be used for the bend test shall conform to the (1) The test piece shall conform to JIS Z 2204 unless otherwise specified. (2) The sampling and preparation of the test piece shall be carried out in conformity with the material standards of respective Japanese Industria
11、l Standard, and unless otherwise specified, the part which is to become the test piece shall be protected from unnecessary deformation or heating. 5. Test method 5.1 Pressing bend method the following: The test shall be carried out in accordance with The supports and the mandrel shall be parallel to
12、 each other. The surfaces of the mandrel and supports which will come in contact with the test piece may be coated with oil. The tip of the mandrel shall have a cylindrical surface of the radius equal to the inside radius specified, and the length of the cylindrical surface shall be greater than the
13、 width of the test piece. The part of supports which comes in contact with the test piece shall be of a cylindrical surface with the radius not less than 10 mm. The distance between the supports shall conform to the following formula (refer to Fig. 1). The tolerance on the distance between the suppo
14、rts shall be as shown in Table 1. L=2r+3t where, L : distance between two supports (mm) r : inside radius (mm) t : thickness or diameter of test piece or diameter of the inscribed circle (mm) COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standa
15、rds Association Licensed by Information Handling Services STD*JIS Z 22iB-ENGL 177b 9 Li933bOB 053b1176 05T I 3 Z 2248-1996 Table 1. Tolerance on distance between supports Unit: mm support Thickness or diameter Tolerance of test piece or diameter of the inmibed circle (t) I Exceeding 10 t I 2 10 or l
16、ess +5 Fig. 1. Pressing bend method Direction of testing force Pressurizing Mandrel Note (l) 8 is specified bend angle. (5) The bend angle to be formed by the method shown in Fig. 1 shall be up to approximately 170“. When the bend angle is 180, the test piece shall be compressed, after being bent to
17、 170“ by means of the foregoing method, on both ends towards one another by means of an insert having a thickness two times the specified inside radius, as shown in Fig. 2. However, in Fig. 1 the distance between the two supports shall be L = 2r + 2t, the tolerance on the distance between supports a
18、s shown in Table 2 and the test piece shall be pressed until it passes through the clearance between the supports. Thereafter, the test piece may be deemed to have been bent to 180“. Fig. 2. 180 degree bending Direction of testing force Table 2. Tolerance on distance between supports Unit: mm Thickn
19、ess or diameter Exceeding 10 t 10 or less COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information Handling Services STD=JIS Z 2248-ENGL L97b i.1733b08 053b479 T9b 4 Z 2248-1996 (6) In the case of close contac
20、t, the test piece shall be treated by the method shown in Fig. 3, after being bent to approximately 170“ with a suitable inside radius. Fig. 3. Close contact bending Direction of testing force ! I I 5.2 Winding bend method conform to the following: In the winding bend method, the test shall (i) As s
21、hown in (a) or (b) of Fig. 4, the test piece shall be made into specified form and angle at the approximate middle part by such a manner that one leg of the test piece is pressed and the other one is bent so that the middle part is wound around a mandrel or a mould. The position at which the testing
22、 force is applied shall conform to (a) and (b) of Fig. 4. Fig. 4. Winding bend method Testing Test piece piece L ? Mould (2) When the bend angle is 180“ and the inside radius is especially small, or in the case of close contact, the test piece shall be compressed, after being bent to 180“ with a sui
23、table inside radius by the method (i) or the like, on both ends towards one another until the inside radius attains the specified value according to the method given in Fig. 2 or Fig, 3. COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards A
24、ssociation Licensed by Information Handling Services 5. Z 2248-1996 5.3 V-block method The testing force shall be applied gradually to the test piece placed on the V-block by putting the mandrel on its middle part to be bent to specified form (see Fig. 5). The V-block method shall be used in accorda
25、nce with the material standard in each relevant Japanese Industrial Standard. The shape and dimension of the V-block and mandrel shall be as specified in the material standard. Fig. 5. V-block method Direction of testing force 5.4 Test temperature Test temperature shall be within a range of 10C to 3
26、5OC and if the temperature control is required, it shall be 23&5“C, provided if the material standard in each relevant Japanese Industrial Standard specifies it, it shall apply. 6. Observation dismounted from the bend tester, regarding the existence of cracks or any other defect on the outside of th
27、e bent part. The test piece shall be observed with the unaided eye, after t COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information Handling Services STD-JIS Z 22Li8-ENGL L77b D Li133b08 053bLiL bLi4 Z 2248-1
28、996 Edition 1 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1952-10-23 Date of Revision: 1996-10-20 Date of Public Notice in Official Gazette: Investigated by: 1996-10-21 Japanese Industrial Standards Committee Divisional Council on Iron and Steel T
29、his English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan O JSA, 1997 Printed in Tokyo by Hohbunsha Co., Ltd. COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information Handling Services