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1、STDmJIS B 0026-ENGL 1998 4933608 0559973 67b M JIS JAPANESE I N DU STR IAL STANDARD Translated and Published by Japanese Standards Association (IS0 10579 : 1993) Technical drawings- Dimensioning and tolerancing- Non-rigid parts ICs 01.100.20; 17.040.10 Descriptors : technical drawing, tolerances (me
2、asurement), fits, dimensions, dimensional tolerances, drawings Reference number : JIS B 0026 : 1998 (E) 4s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:02 MSTNo reproduction or net
3、working permitted without license from IHS -,-,- _ _ _ _ STD-JIS B 0026-ENGL 1998 4933b08 0559992 502 B 0026 : 1998 (IS0 10579 : 1993) Foreword This translation has been made based on the original Japanese Industrial Standard established by the Minister of International Trade and Industry through de
4、liber a tion s at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law: Date of Establishment: 1998-01-20 Date of Public Notice in Official Gazette: 1998-01-20 Investigated by: Japanese Industrial Standards Committee Divisional Council on Machine Elements JIS
5、 B 0026 : 1998, First English edition published i n 1999-12 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. I O JSA 1999 All rights rese
6、rved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan Copyright Japanese Standards Association Provide
7、d by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:02 MSTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS B 0026-ENGL 2998 = 4933b08 0559393 449 9 JAPANESE INDUSTRIAL STANDARD JIS B 0026 : 1998 (IS0 10579
8、 : 1993) Technical drawings-Dimensioning and tolerancing-Non-rigid parts Introduction This Japanese Industrial Standard has been prepared based on the first edition issued in 1993 of IS0 10579 Technical drawings -Dimensioning and tolerancing-Non- rigid parts without changing the technical contents.
9、The “References” underlined with a dotted line in this Standard are not included in the original International Standard. Certain parts, when removed from their manufacturing environment, may deform significantly from their defined limits owing to their weight, flexibility or the release of internal
10、stresses resulting from the manufacturing processes. These parts are defined as “non-rigid parts” and the deformation is acceptable provided that the parts may be brought within the indicated tolerance by applying reasonable force to facilitate inspection and assembly. Depending on the design functi
11、on and the parts interface with its mating components, instead of, or in addition to, assessing the part conventionally (in its free state condition), it may be necessary to assess the part when subject to restraint that is no greater than those accepted in the assembled condition. Parts in this cat
12、egory include both those of inherently rigid material (such as thin metal parts) and those of inherently flexible material (such as rubber, plastics, etc.). 1 This Japanese Industrial Standard gives rules for dimensioning and tolerancing non-rigid parts where restraining of features is required duri
13、ng verification of dimensions and tolerances specified on a drawing. Scope 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this Standard. For this normative reference, the most recent edition (including amendment) shall
14、 apply. JIS B 0021 Geometrical product specifications (GIs)-Geometrical tolerancing- Remarks The provisions cited from IS0 1101 : 1983, Technical drawings- Geometrical tolerancing-Tolerances of form, orientation, location and run -out-Generalities, definitions, symbols, indications on drawings are e
15、quivalent to the relevant provisions in the said standard. Tolerancing of form, orientation, location and run-out 3 Definitions For the purposes of this Standard, the following definitions apply. i1 3.1 dimensional and/or geometrical tolerances on the drawing. non-rigid part Part which deforms to an
16、 extent that in the free state is beyond the 3.2 free state Condition of a part subjected only to the force of gravity. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:02 MSTNo reprod
17、uction or networking permitted without license from IHS -,-,- 2 B 0026 : 1998 (IS0 10579 : 1993) 4 Basic principles The distortion of a non-rigid part must not exceed that which allows the part to be brought within specified tolerances for verification and positioning at assembly, or assembled, by a
18、pplying pressure or forces not exceeding those which can be expected under normal assembly conditions. It is impossible to avoid the effect of natural forces such as gravity ; but the extent of distortion may depend upon the orientation of the part and condition of the part in the free state. If it
19、is necessary to indicate the geometrical tolerance in the free state, the conditions under which the tolerance is to be achieved(i.e. the direction of gravity, conditions in which it is to be supported, etc.) may have to be indicated in a note, as shown in annex A. For non-rigid parts, identified on
20、 the drawing by the added statement “JIS B 0026-IS0 10579-NR y the restrained condition applies unless the dimensions and tolerances are qualified by the symbol (see 5). 5 Indications on drawings indications as appropriate (see also annex A) : Drawings of non-rigid parts shall include the following
21、a) in or near the title block, the indication “JIS B 0026-IS0 10579-NR ; b) in a note, the conditions under which the part shall be restrained to meet the drawing requirements ; c) geometrical variations allowed in the free state, with the modifying symbol included in the tolerance frame in accordan
22、ce with JIS B 0021 ; d) the conditions under which the geometrical tolerance under free state is achieved, such as direction of gravity, orientation of the part, etc. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie N
23、ot for Resale, 03/10/2007 19:16:02 MSTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS B 0026-ENGL 1978 M 4733608 055?1995 211 I The geometrical tolerance, Followed by the symbol a, iali be ensured in the free state. it her geometrical tolerances ?ply under the conditio
24、ns idicated in the note. 3 B 0026 : 1998 (IS0 10579 : 1993) Annex A (informative) Examples of indication and interpretation Indication on the drawing .pplicable standard : JIS B 00264SO 10579-NR iote Restrained condition : The surface indicated as datum A is mounted (with 64 bolts M6 tightened to a
25、torque of 9 Nem to 15 Nem) and the feature indicated as datum B is restrained at the corresponding maximum material limit (MML). Indication on the drawing c. Gravity direction 4pplicable standard : JIS B 0026-ISO 10579-NR Note Restrained condition : The surface indicated as datum A is mounted (with
26、120 bolts M20 tightened to a torque of 18 Nem to 20 Nem) and the feature indicated as datum B is restrained at the corresponding maximum material limit (h4ML). Interpretation Interpretation The geometrical tolerance, ?ollowed by the symbol a, shall be ensured in the free statt 3ther geometrical tole
27、rances apply under the conditions indicated in the note. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:02 MSTNo reproduction or networking permitted without license from IHS -,-,- 4
28、. B 0026 : 1998 (IS0 10579 : 1993) Annex B (informative) Bibliography 8 1 1 JIS B 0022 : 1984 Datums and datum-systems for geometrical tolerances ? Informative reference IS0 5459 : 1981 Technical drawings-Geometrical * -.D.!ms . an_ . da!K?.-.?Ys!cms lor . !%o.EeK!caE . !eEeraF.ccs . . . . . .is . e
29、quivalent to the said standard. 2 JIS B 0023 : 1996 Technical drawings-Geometrical tolerancing-Maximum material requirement and least material requirement Remarks IS0 2692 : 1988, Technical drawings-Geometrical tolerancing-Max- imum material principle is identical to Part 1 of the said standard. JIS
30、 B 0025 : 1998 Technical drawings -Geometrical tolerancing-Positional toler- ancing Remarks IS0 5458 : 1987, Technical drawings-Geometrical tolerancing-Posi- 3 tional tolerancing is identical to the said standard. Copyright Japanese Standards Association Provided by IHS under license with JSALicense
31、e=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:02 MSTNo reproduction or networking permitted without license from IHS -,-,- STDmJIS 8 0026-ENGL 1998 4933608 0557997 034 m Errata for JIS (English edition) are printed in Standurdizution JoumI, published monthly by the J
32、apanese Standards Association, and also provided to subscribers of JS (English edition) in Monthly Information. 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 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:02 MSTNo reproduction or networking permitted without license from IHS -,-,-