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1、J IS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Edge quality and its grades for material removal parts ICs 21.020 Reference number : JIS B 0721 : 2004 (E) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with J
2、SALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 01:51:22 MDTNo reproduction or networking permitted without license from IHS -,-,- B 0721 : 2004 Foreword This translat,m has been made based on the original Japanese Industrial Standard established by the Minister of
3、Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee according to the proposal of establishing a Japanese Industrial Standard from Japanese Standards Association (JSA), with a draft of Industrial Standard based on the provision of Article 12 Clause 1 of th
4、e Industrial Standardization Law. Attention is drawn to the possibility that some parts of this Standard may conflict with a patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have
5、 technical properties. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public wh
6、ich have the said technical properties. Date of Establishment: 2004-03-20 Date of Public Notice in Official Gazette: 2004-03-22 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Machine Elements JIS B 0721 :2004, First English edition published in 2004-0
7、8 Translated and published by: Japanese Standards Association 4-1 -24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 2004 All rights reserved. No part of this publication may be reproduced or util
8、ized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001
9、, User=Wing, Bernie Not for Resale, 03/12/2007 01:51:22 MDTNo reproduction or networking permitted without license from IHS -,-,- B 0721 : 2004 1 2 3 4 4.1 4.2 4.3 5 Scope . . . Contents . . . Normative references Definition Edge quality . Elements of edge quality Grading of edge quality Criteria of
10、 edge quality Method of indicating edge quality Page (i) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 01:51:22 MDTNo reproduction or networking permitted without l
11、icense from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 0721 : 2004 Edge quality and its grades for material removal parts 1 Scope This Standard specifies the edge quality and its grades of the mechani- cally processed components of which surface layers have been removed by mechani- cal processes.
12、2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied. Geometrical product specifications (GPS)-GeometricaL
13、L tolerancing- Tolerancing of form, orientation, location and run-out Technical drawings-Fundamental tolerancing principle Geometrical Product Specifications (GPS)-Indication of surface texture in technical product documentation Technical drawings-Edges of undefined shape-Vocabulary and indications
14、Geometrical Product Specification (GPS)-Surface texture : Profile method-Terms, definitions and surface texture parameters JIS B 002 1 JIS B 0024 JIS B 003 1 JIS B 0051 JIS B 0601 3 Definition For the purpose of this Standard, the definitions given in JIS B 0051 and the following definitions shall a
15、pply: a) edge a section where two surfaces meet The said section signifies the ridge line and its neighbourhood. The edge in- cludes two types: external and internal (see figures 1 and 2). a) Chamfered external edge b) Rounded external edge Figure 1 External edge Figure 2 Internal edge NOTE : The ri
16、dge line includes the side view ridge line and the front view ridge line (see figure 3). PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 01:51:22 MDTNo reproduction o
17、r networking permitted without license from IHS -,-,- 2 B 0721 : 2094 Front view ridge line a) Example of an objective b) Example of a side c) Example of a front component view ridge line view ridge line Figure 3 Ridge line b) c) fracture clearance ences with the opponent part a loss of materials in
18、 the edge section caused by the removal process a concave section at an internal edge, provided to prevent interfer- 4 Edge quality 4.1 as follows. Elements of edge quality Elements for specifying the edge quality shall be Technical requirements which are individually specified in accordance with JI
19、S B 0024, such as dimensional tolerances, geometrical tolerances and surface roughness, shall apply independently unless any special relationship is specified between them. a) Dimensional and geometrical tolerances of edges NOTE : In the case where geometrical tolerances apply to internal edges as t
20、he design requirement, they shall be indicated individually in accor- dance with JIS B 0021. b) Surface texture of edges, which signifies the state of the edge surface sub- jected to the external affecting factors, including surface roughness, waviness, tool marks, flaws, chips and attached foreign
21、materials. NOTE : In the case where surface roughness other than those specified in this Standard apply, it shall be indicated individually in accordance with JIS B 0031, based on the definitions of the surface roughness param- eters specified in JIS B 0601. Surface integrity of edges, which signifi
22、es the surface integrity subjected to the external factors such as processing force, heat and intrusion of foreign ma- terials. NOTE : It is desirable that the function of the component shall not be affected by such as residual stress, work hardening, burning, cracks, voids and attachment of chips.
23、c) 4.2 lowing three grades according to the function required by the component. a) Grading of edge quality The objective edge shall be classified into the fol- Class A (Precision grade): edges of higher quality in terms of the compo- nent function PROTECTED BY COPYRIGHT Copyright Japanese Standards
24、Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 01:51:22 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 B 0721 : 2004 Dimension class of the edge Permissible dimensional deviation of the ed
25、ge form min. less than Class A Class B Class C 0.000 3 0.002 +0.001 5 +0.03 +0.06 O O O 0.002 0.02 +0.006 +0.08 +0.2 O O O 0.02 0.2 f0.03 +o2 +0.4 O O O 0.2 2 +0.06 f0.4 f0.8 O O O 2 6 +0.2 +1.0 +2.0 O O O b) Class B (Middle grade): edges of middle quality in terms of the component function Class C
26、(Coarse grade): edges of lower quality in terms of the component function Criteria of edge quality Quality criteria of dimensions and their tolerances of functional external edges shall be in accordance with table 1. c) 4.3 a) Criteria of edge quality shall be as follows: Nominal edge size Designati
27、on (informative) 0.000 3 E-O (Ultra super sharp) 0.002 E-1 (Super sharp) 0.02 E-2 (Sharp) 0.2 E-3 (Ordinary) 2 E-4 (Coarse) Table 1 Dimensions and their tolerances of external edges Unit: mm NOTE : The values in the column of dimension class of the edge (burrs, undercuts and pass- ing) refer dimensi
28、ons for the shape a) in JIS B 0051. When a certain designation and the grade are specified, the corresponding dimension class and the permissible dimensional deviation of the edge form shall be applied. b) Quality criteria of dimensions and their tolerances of functional internal edges shall be in a
29、ccordance with table 2. In the case where the indication of undercuts, especially stress concentra- tion, is required, they shall be indicated individually in accordance with JIS B 0051. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IH
30、S Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 01:51:22 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 B 0721 : 2004 Dimension class of the edge min. less than 0.01 0.05 0.05 0.2 0.2 0.5 0.5 1 Table 2 Dimensions and their tolerances of internal edge
31、s Unit: mm Permissible dimensional deviation Nominal edge size Designation of the edge form (informative) Class A Class B Class C +0.001 +0.004 kO.01 0.01 L-o O (Super sharp) +0.005 iro.01 I0.04 0.05 L- 1 O (Sharp 1 +0.03 ir0.05 i02 0.2 L-2 O (Ordinary) +0.1 + O 2 i0.5 0.5 Coarse O (L-3) NOTE : The
32、values in the column of dimension class of the edge refer dimensions for the shape a) in JIS B 0051. When a certain designation and the grade are speci- fied, the corresponding dimension class and the permissible dimensional devia- tion of the edge form shall be applied. c) Quality criteria of geome
33、trical tolerances of functional external edges shall be in accordance with table 3. Table 3 Geometrical tolerances of external edges Unit: mm Dimension class of the feature Tolerances of straightness and circularity as typical values over max. Class A Class B Class C I I 3 I 0.002 1 0.01 I 0.05 I Di
34、mension class of the feature straightness and circularity as Information : Although the tolerances of straightness and circularity are defined by the least area method, the method of least square may also be applied (see JIS B 0021). 3 10 0.005 0.05 0.1 10 30 0.01 0.1 0.2 30 100 0.02 0.2 0.5 I 0.8 I
35、 Information : Although the tolerances of straightness and circularity are defined by the least area method, the method of least square may also be applied (see JIS B 0021). d) Quality criteria of surface texture of functional edges shall be in accordance with table 4. In the case where the surface
36、roughness is required to be indicated individu- ally, they shall be in accordance with JIS B 0031. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 01:51:22 MDTNo repr
37、oduction or networking permitted without license from IHS -,-,- 5 B 0721 : 2004 Class A Rz I 0.8 No surface waviness or tool marks shall be accepted in magnified view by 40. Table 4 Surface texture of edges Class B Class C 0.8cRzs3.2 3.2 Rz s 12.5 No tool marks crossing - the ridge line of the edge
38、shall be accepted. Surface texture Microscopic cracks and blowholes Surface roughness Rz No microscopic cracks and blowholes shall be accepted on the cross section of the sur- face layer in the magnified view by 40. Surface waviness, tool marks or direction of tool marks Microscopic cracks shall be
39、accepted on the cross sec- tion of the surface layer in the magnified view by 20. Surface defect Microscopic cracks shall he accepted on the cross sec- tion of the surface layer in the magnified view by 10. Identification mark Surface layer Grade of surface texture I Work hardening shall be ac- cept
40、ed, but no surface strain. No surface strain shall be accepted. No burrs, flaws or frac- tures shall be accepted in the magnified view by 40. T- 1 (Super smooth surface) Surface strain shall be ac- cepted. No burrs, flaws or frac- tures shall he accepted in the magnified view by 20. Identifica- tion
41、 mark - T-2 (Smooth surface) S-1 (Precision grade surface layer) No burrs, flaws or frac- tures shall be accepted in the magnified view by 10. T-3 (Rough surface) e) Quality criteria of surface integrity of functional edges shall be in accordance with table 5. Table 5 Surface integrity of edges Clas
42、s A Surface integrity Grade of surface integrity I Class B I Class C I (Middle grade surface layer) s-2 grade surface layer) 5 Method of indicating edge quality To indicate the edge quality in the tech- nical documents, either of the following items shall be indicated in or near the title block or i
43、n the drawing. a) The number of this Standard and the grade Example : JIS B 0721-B The number of this Standard, the designation and the grade Example : JIS B 0721-E3-A In the case of indication modifying the grade of specific element of edge quality. Example : In the case of indication of the edge q
44、uality grade for a specific feature using symbols specified in JIS B 0051 (figure 4). b) c) JIS B 0721-B, with class A surface texture d) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for
45、 Resale, 03/12/2007 01:51:22 MDTNo reproduction or networking permitted without license from IHS -,-,- 6. B 0721 : 2004 /- e JIS B 0721-B, with surface texture indicated in the drawing. Figure 4 Example of indication of a specific designation using symbols specified in JIS B 0051 e) In the case wher
46、e specific geometrical tolerances are added to internal edges as the design requirement, they shall be indicated using tolerance frames in ac- cordance with JIS B 0021 (figure 5). U JIS B 0721-B, with the profile tolerance of the surface indicated in the drawing. Figure 5 Example of indication of sp
47、ecific geometrical tolerances PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 01:51:22 MDTNo reproduction or networking permitted without license from IHS -,-,- Emta
48、for nS (English edition) are printed in Standardization Journal, published monthly by the Japanese Standards Association, and also provided to subscribers of JIS (English edition) in MonrhZy Infomarion. Errata will be provided upon request, please contact: Standardization Promotion Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN TEL. 03-3583-8002 FAX. 03-3583-0462 100% Recycied paper PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provid