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1、 J I S 8*0023 96 = 4933608 0532493 924 = UDC 744:621.753.1 J IS JAPANESE INDUSTRIAL STANDARD Technical drawings- Geometrical tolerancing- Maximum material requirement and least material requirement JIS B 0 0 2 3 - 1 9 9 6 Translated and Published bY Japanese Standards Association Printed in Japan 18
2、 S Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:07:40 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*OO23 9b W 4933b08 0532492 8bO W In the event of
3、 any doubt arising, the original Standard in Japanese is to be final authority Errata for JIS (English edition) are printed in Standardization Journal, published monthly by the Japanese Standards Association. Errata will be provided upon request, please contact: Business Department, Japanese Standar
4、ds 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 JE (English edition) in Monthly information. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, Us
5、er=Wing, Bernie Not for Resale, 03/13/2007 22:07:40 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S BX0023 96 4933b08 0532493 7 T UDC 744:621.753.1 JAPANESE INDUSTRIAL STANDARD J I S Technical drawings - Geometrical tolerancing - Maximum material requirement and least
6、 material requirement B 0023-1996 Preface as Japanese Industrial Standard This Japanese Industrial Standard has been described based on IS0 2692 (Technical drawings - Geometrical tolerancing - Maximum material principle) published in 1988 as the first edition and IS0 2692 Amendment 1 (Technical draw
7、ings - Geometrical tolerancing - Maximum material principle Amendment 1: Least material requirement) published in 1992, without alteration in the technical contents? organising the former as Part 1 and the latter as Part 2. Portions marked with side lines (dotted lines) in this Standard are those of
8、 which specified contents in the original International Standard were altered or not specified in it. Part 1 Maximum material requirement O. Introduction o. 1 and bolt The assembly of parts depends on the relationship between the actual size actual geometrical deviation of the features being fitted
9、together? such as the holes in two flanges and the bolts securing them. The minimum assembly clearance occurs when each of the mating features is at its maximum material size (e.g, largest bolt and smallest hole) and when their geometrical deviations (e.g. positional deviation) are also at their max
10、imum. Assembly clearance increases to a maximum when the actual sizes of the assembled features are furthest from their maximum material sizes (e.g. smallest shaft and largest hole) and when the geometrical deviations (e.g. positional deviations) are zero. their maximum material size, the indicated
11、geometrical tolerance may be increased without endangering the assembly of the other part. This is called the “maximum material requirement“ and is indicated on drawings by the symbol 0. The figures in this Standard are intended only as illustrations to aid the understanding on the maximum material
12、requirement, and numerical values of dimensions and tolerances have been given for illustrative purposes only. From the above, it follows that if the actual sizes of a mating part do not reach For simplicity, the examples are limited to simple shapes. 0.2 For uniformity all figures in this Standard
13、are in third angle projection. j Informative reference: In IS0 2692, all of the figures are indicated in first i angle projection. I It should be understood that the first angle projection could equally well have For the definitive presentation (proportions and dimensions) of symbols for been used w
14、ithout prejudice to the principles established. geometrical tolerancing, see IS0 7083. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:07:40 MDTNo reproduction or networking permitted wi
15、thout license from IHS -,-,- J I S B*0023 96 = 4933608 0532494 b33 2 B 0023-1996 ; Informative reference: As to the contents of IS0 7083, see JIS B 0021. I 1. Scope This Standard defines and describes the maximum material requirement and specifies its application. The use of the maximum material req
16、uirement facilitates manufacture without disturbing the free assembly of parts where there is a mutual dependence of size and geometry. Note : The envelope requirement (see 5.2.2) for a single feature may be indicated by the symbol (see JIS B 0024) or by reference to an appropriate national standard
17、 invoking this requirement. 2. References IS0 1101 Technical drawings - Geometrical tolerancing - Tolerancing of form, orientation, location and run-out - Generalities, definitions, symbols, indications on drawings j 1. Informative reference: JIS B 0021 - 1984 (Indications of geometrical tolerances
18、on drawings) is equivalent to this International Standard. IS0 5458 Technical drawings - Geometrical tolerancing - Positional tolerancing Remarks: JIS B 0025-1991 (Technical drawings - Geometrical tolerancing i - Positional tolerancing) conforms to this International Standard. IS0 5459 Technical dra
19、wings - Geometrical tolerancing - Datums and datum- systems for geometrical tolerances Informative reference: JIS B 0022-1984 (Datums and datum-systems for i geometrical tolerances) is equivalent to this International Standard. ISO/TR 5460 Technical drawings - Geometrical tolerancing - Tolerancing o
20、f form, orientation, location and run-out - Verification principles and methods - Guidelines Informative reference: See Informative reference of JIS B 0021. , IS0 7083 Technical drawings - Symbols for geometrical tolerancing - Proportions and dimensions IS0 8015 Technical drawings - Fundamental tole
21、rancing principle Remarks: JIS B 0024-1988 (Technical drawings - Fundamental tolerancing I principle) conforms to this International Standard. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/200
22、7 22:07:40 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*0023 96 4933608 0532495 57T H 3 B 0023-1996 3. Definitions 3 . 1 actual local size Any individual distance at any cross-section of a feature, i.e. any size measured between any two opposite points examples:
23、see Figs. 1, 12 (b) and 13 (b). 3 . 2 mating size 3 . 2 . 1 perfect feature which can be circumscribed about the feature so that it just contacts the surface at the highest points. mating size for an external feature The dimension of the smallest Note: For example, the size of the smallest cylinder
24、of perfect form or the smallest distance between two parallel planes of perfect form which just contacts the highest point(s) of the actual surface(s) (see Fig. 1). 3 . 2 . 2 perfect feature which can be inscribed within the feature so that it just contacts the surface at the highest points (see Inf
25、ormative reference Fig. i). mating size for an internal feature The dimension of the largest Note: For example, the size of the largest cylinder of perfect form or the largest distance between two parallel planes of perfect form which just contacts the highest point(s) of the actual surface(s) see F
26、ig. 1 and Informative reference Fig. i. 3.3 maximum material condition (MMC) The state of the considered feature in which the feature is everywhere at that limit of size where the material of the feature is at its maximum, e.g. minimum hole diameter and maximum shaft diameter (see Fig. i). Note: The
27、 axis of the feature need not be straight. 3.4 maximum material size (MMS) The dimension defining the maximum material condition of a feature (see Fig. i). 3.5 least material condition (LMC) which the feature is everywhere at that limit of size where the material of the feature is at its minimum, e.
28、g. maximum hole diameter and minimum shaft diameter (see Fig. i ) . The state of the considered feature in 3.6 least material size (LMS) condition of a feature (see Fig. i). The dimension defining the least material 3.7 virtual condition (VC) ted by the drawing data for the feature; the condition is
29、 generated by the collective effect of the maximum material size and the geometrical tolerances. When the maximum material principle is applied, only those geometrical tolerances followed by the symbol oshall be tuken into account when determining the virtual condition (see Fig. i). The limiting bou
30、ndary of perfect form permit- Informative reference: As to holes, refer to Informative reference Fig. 1. j Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:07:40 MDTNo reproduction or net
31、working permitted without license from IHS -,-,- JIS B+0023 96 4933608 0532496 406 material size Maximum material condition 4 4 B 0023-1996 - Note: The virtual condition represents the design dimension of the functional gauge. Perpendicularity -tolerance zone +O. 05 3 . 8 virtual size (VS) feature.
32、The dimension defining the virtual condition of a Fig. 1 (a) Dimensioning in accordance with the independence principle Indication on the drawing Interpretation (b) Dimensioning in accordance with the envelope principle Indication on the drawing Interpretation 95150.05 Virtual size c i Mating size ,
33、4 ion Perpendicularity tolerance zone + O. 05 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:07:40 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*00
34、23 96 W 4933608 0532497 342 5 B 0023-1996 Informative reference Fig. 1 (a) Dimensioning in accordance with the independence principle I I Indication on the drawing Interpretation Perpendicularity - - tolerance zone +0.05 - ,- (b) Dimensioning in accordance with the envelope principle Indication on t
35、he drawing Interpretation I Maximum material requirement Perpendicularity - - Lotolerance zone + 0.05 - 4.1 General The maximum material requirement is a tolerancing principle which requires that the virtual condition for the toleranced feature(s) and, if indicated, the maximum material condition of
36、 perfect form for datum feature(s), shall not be violated. This requirement applies to axes or median planes and takes into account the mutual relationship of size and the geometrical tolerance concerned. The application of this requirement shall be indicated by the symbol 0. 4.2 When applied to the
37、 toleranced feature(s), the maximum material requirement permits an increase in the stated geometrical tolerance when the toleranced feature concerned departs from its maximum material condition provided that the feature does not violate the virtual condition. Maximum material requirement applied to
38、 the toleranced feature(s) Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:07:40 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*0023 96 = 4933608 05324
39、98 289 6 B 0023-1996 4.3 Maximum material requirement applied to the datum feature(s) When the maximum material requirement is applied to the datum feature(s), the datum axis or median plane may float in relation to the toleranced feature if there is a departure from the maximum material condition o
40、f the datum feature. The value of the float is equal to the departure of the mating size of the datum feature from its maximum materialsize see Figs. 27 (b) and 27 (c). Note: The departure of the datum feature from its maximum material size does not increase the tolerance of the toleranced features
41、in relation to each other. 5. In all cases, the designer has to decide whether the application of the maximum material require- ment may be permitted on the tolerances concerned. Application of the maximum material requirement Note: The maximum material requirement should not be used in such applica
42、tions as kinematic linkages, gear centres, threaded holes, interference fit holes, etc., where the function may be endangered by an increase in the tolerance. 5.1 requirement is most commonly used with positional tolerances, and therefore positional tolerancing has been used for the illustrations in
43、 this sub-clause. Positional tolerance for a group of holes The maximum material Note: In the calculations of virtual size, it has been assumed that the pins and holes are at their maximum material size and are of perfect form. 5 . 1 . 1 four holes is shown in Fig. 2. fixed pins which fit into the g
44、roup of holes is shown in Fig. 4. The indication on the drawing of the positional tolerance for a group of The indication on the drawing of the positional tolerance for a group of four The minimum size of the holes is 8.1 - this is the maximum material size. The maximum size of the pins is 7.9 - thi
45、s is the maximum material size. 5.1.2 pins is 8.1 - 7.9 = 0.2 The sum of the positional tolerances for the holes and pins shall not exceed this difference (0.2). In this example, this tolerance is equally distributed between holes and pins, i.e. the positional tolerance for the holes is 0.1 (see Fig
46、. 2) and the positional tolerance for the pins is also 0.1 (see Fig. 4). The tolerance zones of 0.1 are located at their theoretically exact positions (see Figs. 3 and 5 ) . Depending on the actual size of each feature, the increase in the positional tolerance may be different for each feature. The
47、difference between the maximum material size of the holes and the Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:07:40 MDTNo reproduction or networking permitted without license from IH
48、S -,-,- JIS 8+0023 96 4933608 0532499 115 7 B 0023-1996 Fig. 2 Indication on the drawing Fig. 4 Indication on the drawing 4-81:; Fig. 3 Interpretation Fig. 5 Interpretation 5 . 1 . 3 at their maximum material size and of perfect form. The axes are located at extreme positions within the tolerance zone. seen from Figs. 6 to 9 that assembly of the parts is still possible under the most unfavourable conditions. Fig. 6 shows four cylindrical surfaces for each of the four holes all being Fig. 8 shows the corresponding pins at the