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1、, JIS B*Ob2L 84 = 4933608 0008472 b W -. JIS - , L - - UDC 744.44: 621.753-1 JAPANESE INDUSTRIAL STANDARD Definitions and Designations of Geometrical Deviations JIS B 062 I -1984 Translated and Published Japanese Standards Association 12 s i Printed in Japan Copyright Japanese Standards Association
2、Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS B*Ob21 84 4733608 0008473 8 Translation without guarantee standard in Japanese is to be. eviden
3、ce i n the event of any doubt arising, the original c Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- J I
4、S B*O62L 84 W 4933608 0008474 - T W UDC 744.44:621.753-1 1. Scope JAPANESE INDUSTRIAL STANDARD J I S Definitions and Designations of B 0621-1984 Geometrical Deviations This Japanese Industrial Standard specifies the definitions and designa- tions of the formal deviations , orientational deviations,
5、locational deviations , and run-out s , hereinafter generically referred to as the “geometrical devia- tionsfl, of the considered objects. Remark: The methods of designation and diagrammatical indication of geometrical tolerances which are the permissible values of geometrical deviations shall be ba
6、sed on JIS B 0021. 2, Definition The definitions of the main terms used in this standard shall be as follows : (1) feature A point, line, axis, surface, or median surface as the object of geometrical deviations. (2) single feature A feature for which geometrical deviations are determined without rel
7、ation to datums. (3) related feature A feature for which geometrical deviations are determined in relation to datums. (4) datum A theoretically exact geometrical reference established for determining the orientational deviation , locational deviation , run- outs, and the like of a feature, For examp
8、le, where the geometrical reference is a point, straight line, axial straight line (l) , plane, or median plane, it is referred to as a datum point, datum straight line, datum axial straight line, datum plane, or datum median plane, respectively. Note (l) The axial straight line means an axis withou
9、t any formal deviation, that is, an axis which is a geometrically exact straight line. Remark: Details about datums shall be as specified in JIS B 0022. . Applicable Standards : JIS B 0021-Indications of Geometrical Tolerances on Drawings JIS B 0022-Datums and Datum-systems for Geometrical Tolerance
10、s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*Ob2I 84 4733608 0008475 I 2 B 0621-1984 (5) stra
11、ight line feature A feature which is specified to be a straight line from the functional point of view. sectional profile line which appears on the cross-section when a plane feature is cut with a plane normal to it, an axis, a generator of cylinder, a knife edge, or the like. For example, a cross-
12、(6) axis Among straight line features, the line connecting the centres f- distance (f) between the t w i planes when that straight line feature (L) is held between two geometrical parallel planes which are normal to the geometrical plane (PA) containing both ends of that straight line feature (L) an
13、d normal to the datum plane (P,) and which have the theoretically exact angle (a) against the datum plane (P , ) (Fig. 24). Fig. 24 (3) Angularity of Plane Feature to Datum Straight Line or Datum Plane The angularity of a plane feature to the datum straight line or datum plane shall be represented b
14、y the distance (f) between the two planes in the case where the distance between the two parallel planes becomes minimum when that plane feature (P) is held between two geometrical parallel planes having the theoretically exact angle (a) against the datum straight line (L,) OF datum plane (P,) (Fig.
15、 25, Fig. 26). Fig. 25 .P Fig. 26 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- - J I S B*Ob2L 84 493360
16、8 0008487 8 14 B 0621-1984 5.10 Positional Deviation Positional deviation shall be represented as shown below by the size of the region occupied by the considered point, straight line feature, or plane feature relative to the theoretically exact position, and be expressed as “positional deviation -
17、mm“ or “positional deviation pm“. - (i) Positional Deviation of Point The positional deviation of a point shall be represented by the diameter (f) of the geometrical circle or geometrical sphere having its centre at the point ( E T ) situated at the theoretically exact position and passing through t
18、he considered point (E) (Fig. 27). Fig. 27 (2) Positional Deviation of Straight Line Feature (a) Positional Deviation in One Direction The positional deviation of a straight line feature in one direction shall be represented by the distance (f) between the two planes when that straight line feature
19、(L) is held between two geometrical parallel planes which are normal to that direction and which are arranged symmetri- cally with respect to the geometrical straight line (5) situated at the theoretically exact position (Fig. 28). Fig. 28 Note (5) The plane (PT) in Fig. 28 shows a plane which conta
20、ins the geometrical straight line situated at the theoretically exact position and which is normal to the considered one direction. Reference: The positional deviation of a straight line feature where the straight line feature is on one plane is represented by the distance (f) between the two straig
21、ht lines when that straight line feature (L) is held between two geometrical parallel planes arranged symmetrically with respect to the geometrical straight line (L T) situated at the theoretically exact position (Reference Fig. 1). Copyright Japanese Standards Association Provided by IHS under lice
22、nse with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- 15 B 0621-1984 Reference Fig. 1 3 k - One direction - - - + (b) Positional Deviation in Two Directions Normal to Each Other T
23、he positional deviation of a straight line feature in two direc- tions normal to each other shall be represented by the distances ( A , 1, ) between two planes (that is, the lengths of two sides of the rectangular parallelepiped defined by two sets of two parallel planes) when that straight line fea
24、ture (L) is held between two sets of two geometrical parallel planes which are respectively normal to the considered two directions and which are arranged symmetrically with respect to the geometrical straight line (L T ) situated at the theoretically exact position (Fig. 29). . Fig. 29 Two di recti
25、ons (c) Positional Deviation without Specified Direction The positional deviation of a straight line feature where no direction is speci- fied shall be represented by the diameter (f) of the qlinder having the smallest diameter among those geometrical cylinders of which the axis agrees with the geom
26、etrical straight line (LT) situated at the theoretically exact position and which contains the whole of the considered straight line feature (L) (Fig. 30). Fig, 30 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not
27、for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*Ob2L 84 W 4733608 0008487 L W 16 B 0621-1984 (3) Positional Deviation of Plane Feature The positional deviation of a plane feature shall be represented by the distance ( f ) between the
28、two planes when that plane feature .(P) is held between two geometri- cal parallel planes arranged symmetrically with respect to the geometrical plane (PT ) situated at the theoretically exact position (Fig. 31). Fig. 31 5.11 Coaxiality The coaxiality of an axis to the datum axial straight line shal
29、l be represented by the diameter (f) of the cylinder having the smallest diameter among those geometrical cylinders containing the whole of that axis (A) and having an axis agreeing with the datum axial straight line ( A D ) (Fig. 32), and be expressed as “coaxiality mm“ or “coaxiality umlf. Fig. 32
30、 - - Reference: The concentricity at two circles as plane figures shall be represented by the diameter (f) of the geometrical circle concentric with the centre (ED) of the datum circle and passing through the centre (E) of the considered circular feature (Reference Fig. 2). Reference Fig. 2 In this
31、case, the centre of the circular feature shall mean the centre of the concentric circles in the case where the difference in radius between the two circles becomes minimum when that circular feature is held between two concentric geometrical circles. Copyright Japanese Standards Association Provided
32、 by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- 17 B 0621-1984 5.12 Symmetricity Symmetricity shall be represented as shown in the following (i) or (2) by
33、the size of the region occupied by the considered axis or median plane in the direction normal to the datum axial straight line or datum median plane, and be expressed as llsymmetricity - mmT1 or “symmet- ricity - yml!. e e (1) Symmetricity of Axis (a) Symmetricity with Respect to Datum Median Plane
34、 The sym- metricity of an axis with respect to the datum median plane shall be represented by the distance (n between the two planes when that axis is held between two geometrical parallel planes arranged symmetrically with respect to the datum median plane (Ph, ) (Fig. 33). Fig. 33 (b) Symmetricity
35、 in Two Directions Normal to Each Other with of an axis in two directions normal to each other with respect to the datum axial straight line shall be represented by the distances ( A , f2 ) between the two planes (that is, the length of two sides of the rectangular parallelepiped defined by two sets
36、 of two parallel planes) when that axis (A) is held between two sets of two geometrical parallel planes respectively normal to the con- sidered directions and symmetrically arranged with respect to the datum axial straight line (A,) (Fig. 34). Fig. 34 Two directions JL Copyright Japanese Standards A
37、ssociation Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*Ob21 8 4 W 4733608 0008471 T = 18 B 0621-1984 (2) Symmetricity of Median Surface
38、 (a) Symmetricity in One Direction with Respect to Datum Axial Straight Line The symmetricity of a median plane in one direction with respect to the datum axial straight line shall be represented by the distance (f) between the two planes when that median plane (Phl ) is held between two geometrical
39、 parallel planes normal to the considered direction and symmetrically arranged with respect to the datum axial straight line (A,) (Fig. 35). Fig. 35 One direction (b) Symmetricity with Respect to Datum Median Plane The symmetri- city of a median plane with respect to the datum median plane shall be
40、represented by the distance ( f ) between the two planes when that median plane (P,) is held between two geometrical parallel planes symmetrically arranged with respect to the datum median plane (PMD ) (Fig. 36). Fig. 36 5.13 Circular Run-Out Circular run-out, as a rule, shall be repre- sented by th
41、e largest value among the run-out values at respective positions on the surface of the considered object, as shown below according to the specified direction, and be expressed as “circular run-out - mm“ or llcircular run-out - umff. (i) Circular Run-Out in Radial Direction The circular run-out in th
42、e radial direction shall be represented by the difference (f) between the largest and smallest values of the distance from the datum axial straight line to the considered surface (K) in a plane (measuring plane) normal to the datum axial straight line (A,) (Fig. 37). Copyright Japanese Standards Ass
43、ociation Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- 19 B 0621-1984 e Fig. 37 (2) Circular Run-Out in Axial Direction The circular run-out in t
44、he 1 by the difference ( f ) between the largest and smallest values of the distance from a geometrical plane (PA) normal to the datum axial straight line to the consid- ered surface (K) on a cylinder surface (measuring cylinder) a given distance apart from the datum axial straight line (AD) (Fig. 3
45、8). Fig. 38 (3) Circular Run-Out in Oblique Normal Direction The circular run- out in the oblique normal direction, in the case where the normal line to the considered surface has a given angle to the datum axial straight line, shall be represented by the difference ( f ) between the largest and sma
46、llest values of the distance from the apex of the cone to the considered surface (K) on a conical surface (measuring cone) having the said normal line as its generator and having the datum axial straight line (A,) as its axis (Fig. 39). Fig. 39 : V , Measuring direction .surface Copyright Japanese S
47、tandards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:00:08 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*Ob2L 8 4 4933608 B08493 3 I 20. B 0621-1984 (4) Circular Run-Out in Sp
48、ecified Oblique Direction The circular run-out in a specified oblique direct.ion, in the case where the specified direction is fixed regardless of the normal direction of the considered surface and also has a given angle (a) to the datum axial straight line (A,), shall be represented by the difference (f) between the largest and smallest values of the distance from the apex of the cone to the considered surface (K) on a conical surface (me