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1、J I S B*O419 91 m 4933b08 0501870 7 m 7JlS JAPANESE INDUSTRIAL STANDARD General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications UDC 621.753.1 :531.7 Translated and Published by Japanese Standards Association Printed in Japan 8s Copyright Japanese Sta
2、ndards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:05:38 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S BX04i19 91 m 4933b08 0501871 9 m In the event of any doubt arising, the or
3、iginal Standard in Japanese is to be fia1 authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:05:38 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS B
4、*0419 71 4933608 0501872 O I UDC 621.753.1:531.7 JAPANESE INDUSTRIAL STANDARD J I S General tolerances - Part 2: Geometrical tolerances for features without B 0419-1991 (IS0 2768-2: 1989) individual tolerance indications Foreword as the Japanese Industrial Standard This Standard is the Japanese Indu
5、strial Standard drawn up without changing the technical contents and the form of copy of Standard, translating the IS0 2768-2 (General tolerances-Part 2: Geometrical tolerances for features without individual tolerance indications) published on 1989 as the first edition. Furthermore, “Informative Re
6、ferences“ being attached with side lines (dotted lines) in this Standard are the matters not included in the original International Standard. Introduction All features on component parts always have a size and a geometrical shape. For the deviation of size and for the deviations of the geometrical c
7、haracteristics (form, orientation and location) the function of the part requires limitations which, when exceeded, impair this function. The tolerancing on the drawing should be complete to ensure that the elements of size and geometry of all features are controlled, i.e. nothing shall be implied o
8、r left to judgement in the workshop or in the inspection department. The use of genenal tolerances for size and geometry simplifies the task of ensuring that this prerequisite is met. 1. ScoDe This Japanese Industrial Standard is intended to simplify drawing indications and specifies general geometr
9、ical tolerances to control those features on the drawing which have no respective individual indication. It specifies general geometrical tolerances in three - - tolerance classes. This Standard mainly applies to features which are produced by removal of material. Its application to features manufac
10、tured by other processes is possible; however special ex- amination is required to ascertain whether the customary workshop accuracy lies within the general geometrical tolerances specified in this Standard. 2. General When selecting the tolerance class, the respective customary workshop accuracies
11、have to be taken into consideration. If smaller geometrical tolerances are required or larger geometrical tolerances are permissible and more economical for any individual feature, such tolerances should be indicated directly in accordance with IS0 1101 (see A.2 of Annex). i The contents of specific
12、ation of IS0 1101 are equal to JIS B 0021-1984 (Indication of geometrical tolerances on draw- ings). Informative reference: i Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:05:38 MDTNo
13、reproduction or networking permitted without license from IHS -,-,- J I S B*Og17 71 4733608 0501873 2 2 B 0419-1991 (IS0 2768-2: 1989) General geometrical tolerances in accordance with this Standard apply when drawings or associated specifications refer to this Standard is accordance with clause 6.
14、These general geometrical tolerances apply to features which do not have respective individual geometrical tolerance indications. ing cylindricity, profile of any line, profile of any surface, angularity, coaxiality, positional tolerances and total run-out. used when the fundamental tolerancing prin
15、ciple in accordance with JIS B 0024 is used and indicated on the drawing (see B.1 of Annex). General geometrical tolerances apply to all geometrical tolerance characteristics, exclud- In any event, general geometrical tolerances in accordance with this Standard should be 3. Normative references The
16、following International Standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indi- cated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged
17、to investigate the possibility of applying the most recent edi- tions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid Internal Standards. IS0 1101 : 1983 Technical drawings-Geometrical tolerancing-Tolerancing of form, orientation, location and run-out
18、-Generalities, definitions, symbols, in- dications on drawings IS0 2768-1: 1989 Remarks: General tolerances-Part 1: Tolerances for linear and angular dimensions without individual tolerance indications JIS B 0405- 199 1 (General tolerances-Part 1 : Tolerances for linear and an- gular dimensions with
19、out individual tolerance indications) conforms to this International Standard. IS0 5459: 198 1 Technical drawings-Geometrical tolerancing-Datums and datum- systems for geometrical tolerances IS0 8015: 1985 Technical drawings-Fundamental tolerancing principle Remarks: 4. Definitions For the purposes
20、of this Standard the definitions for geometrical tolerances given in IS0 1101 and IS0 5459 apply. i Informative reference: JIS B 0024- 1988 (Technical drawings-Fundamental tolerancing principle) conforms to this International Standard. The contents of the provisions of IS0 1101 and IS0 5459 are i re
21、spectively equal to JIS B 0021-1984 and JIS B 0022-1984 i (Datums for geometrical tolerances). 5. General geometrical tolerances (see B.l of Annex) 5.1 General tolerances for single featurers 5.1.1 Straightness and flatness The general tolerances on straightness and flatness are given in Table 1. Wh
22、en a tolerance is selected from this Table, it shall be based, in the case of straightness, on the length of the corresponding line and, in the case of flat- ness, on the longer lateral length of the surface, or the diameter of the circular surface. Copyright Japanese Standards Association Provided
23、by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:05:38 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS B X O 4 1 9 91 4933608 0503874 4 Tolerance class 3 B 0419-1991 (IS0 2768-2: 1989) Straightness and flatn
24、ess tolerances for ranges of nominal lengths Up to 10 Over 10 Over 30 Over 100 Over 300 Over 1000 up to 30 up to 100 up to 300 up to 1000 up to 3000 General tolerances on straightfiess and flatness K L H I 0.02 I 0.05 I 0.1 I 0.2 I 0.3 I 0.4 0.05 o. 1 0.2 0.4 0.6 0.8 0.1 0.2 0 . 4 0.8 1.2 1.6 5.1.2
25、Circularity The general tolerance on circularity is equal to the numerical value of the diameter tolerance, but in no case shall it be greater than the value of cir- cular radial run-out tolerance of Table 4 (see example of B.2 of Annex). 5.1.3 Cylindricity The general tolerances on cylindricity are
26、 not specified. Remarks 1. The cylindricity deviation comprises three components: circularity deviation, straightness deviation and parallelism deviation of opposite generator lines. Each of these components is controlled by its in- dividually indicated or its general tolerance. If, for functional r
27、easons, the cylindricity deviation has to be smaller than the combined effect (see B.3 of Annex) of the general tolerances of circularity, straightness and parallelism, an individual cylindricity tolerance in accordance with IS0 1101 should be indicated for the fea- ture concerned. Sometimes, (e.g.
28、in the case of a fit), the indication of the en- velope requirements O is appropriate. . 2. 5.2 General tolerances for related features 5.2.1 General The tolerances specified in 5.2.2 to 5.2.6 apply to all features 5.2.2 Parallelism The general tolerance on parallelism is equal to the numerical whic
29、h are in relation to one another and which have no respective individual indication. value of the size tolerance or the flatness/straightness tolerance, whichever is the greater. The longer of the two features shall be taken as the datum. If the features are of equal nominal length, either may be ta
30、ken as the datum (see B.4 of Annex). given in Table 2. The longer of the two sides forming the right angle shall be taken as the datum. If the sides are of equal nominal length, either may be taken as the datum. 5.2.3 Perpendicularity The general tolerances on perpendicularity shall be as Copyright
31、Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:05:38 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*0417 91 4733608 0501875 b 4 B 0419-1991 (IS0 2768-2: 1989) T
32、able 2. General tolerances on perpendicularity Unit: mm Tolerance class Perpendicularity tolerances for ranges of I- nominal lengths of the shorter side I Up to 100 I Over 100 I Over300 I Over 1000 up to 300 up to 1000 up to 3000 I General tolerances on perpendicularity H I 0.2 I 0.3 I 0.4 I 0.5 K 0
33、.4 0.6 0.8 1 L 0.6 1 1.5 2 5.2.4 Symmetry The general tolerances on symmetry shall be as given in Table 3. The longer of the two features shall be taken as the datum. If the features are of equal nominal length, either may be taken as the datum. The general tolerances on symmetry apply where (see th
34、e examples of B.5 of Annex) at least one of the two features has a median plane or axes of the two features are perpendicular to each other Remarks: Table 3. General tolerances on symmetry Unit: mm Symmetry tolerances for ranges of nominal length Tolerance Up to 100 Over 100 Over 300 Over 1000 class
35、 up to 300 up to 1000 up to 3000 General tolerances on symmetry H 0.5 0.6 L 0.6 1 1.5 2 I 5.2.5 Coaxiality The general tolerances on coaxiality are not specified. Remarks: The deviation in coaxiality may, in an extreme case, be as great as the tolerance value for circular radial run-out given in Tab
36、le 4, since the devia- tion in radial run-out comprises the deviation in coaxiality and the devia- tion in circularity. 5.2.6 Circular run-out The general tolerances on circular run-out (radial, axial and inclined normal line directions) shall be as given in Table 4. For general tolerances on circul
37、ar run-out, the bearing surfaces shall be taken as the datum if they are designated as such. Otherwise, for circular radial run-out, the longer of the two features shall be taken as the datum; if the featurers are of equal nominal length, either may be taken as the datum. Copyright Japanese Standard
38、s Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:05:38 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B X O 4 1 9 91 4933608 0501876 8 5 B 0419-1991 (IS0 2768-2: 1989) Table 4. Gene
39、ral tolerances on circular run-out U.nit: mm Tolerance class I Circular run-out tolerance H I o. 1 K I 0.2 6. Indications on drawinas 6.1 If general tolerances in accordance with this Standard shall apply in conjunction with the general tolerances in accordance with JIS B 0405, the following informa
40、tion shall be indi- cated in or near the title block. a) “JIS B 0419“ b) Tolerance class in accordance with JIS B 0405 c) Tolerance class in accordance with this Standard Example: JIS B 0419-mK Informative reference: In IS0 2768-2, “JE B 0419“ in marked as “IS0 2768“. In this case the general tolera
41、nces for angular dimensions in accordance with JIS B 0405 6.2 If the general dimensional tolerances (tolerance class m) do not apply, the respective do not apply to right angles (90“) which are implied but not indicated. symbols shall be omitted from the designation indicated on the drawing. Example
42、: JIS B 0419-K 6.3 In cases where the envelope requirement O also applies to all single features of size), the symbol “E“ shall be added to the designation specified in 6.1: Example: JIS B 0419-mK-E Remarks: The envelope requirement O cannot apply to features with individually indi- cated straightne
43、ss tolerances which are greater than their size tolerances, e.g. stock material. 7. Rejection Unless otherwise stated, workpieces exceeding the general geometrical tolerance shall not lead to automatic rejection provided that the ability of the workpiece to function is not impaired (see A.4 of Annex
44、). a 1) For the purposes of this Standard, a single feature of size comprises a cylindrical surface or two parallel plane surfaces. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:05:38
45、MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*0419 91 4933b08 0501877 T 6 B 0419-1991 (IS0 2768-2: 1989) Annex A Concepts behind general tolerancing of geometrical characteristics A.l General tolerances shall be indicated on the drawing by reference to this Standa
46、rd in accordance with clause 6. The values of general tolerances correspond to grades of customary workshop accuracy, the appropriate tolerance class being selected and indicated on the drawing. A.2 Above a certain tolerance value, which corresponds to the customary workshop ac- curacy, there is usu
47、ally no gain in manufacturing economy by enlarging the tolerance. In any event, workshop machinery and the usual workmanship normally do not manufacture features with greater deviations, For example, a feature of 25 mm f 0.1 mm diameter by 80 mm long manufactured in a workshop with a customary accur
48、acy equal to or finer than JIS B 0419-mH contains the geometrical deviations well within 0.1 mm for circularity, 0.1 mm for straightness of surface elements, and 0.1 mm for circular radial run-out (the values given have been taken from this Standard). Specifying tolerances would be of no benefit in this particular workshop. the “general tolerances“, then that feature should have the smaller tolerance indicated in- dividually adjacent to the particular feature. This type of tolerance falls outside the scope of general tolerances. In cases where the function of a feature allows a geometri