1、UDC 621.9-229.3 DEUTSCHE NORM April 1986 60 centre holes Types R, A, B, and C DIN 332 Part 1 Zentrierbohrungen 60“; Form R, A, B und C Supersedes November 1973 edition. In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has be
2、en used throughout as the decimal marker. See Explanatory notes for connection with International Standards IS0 866 - 1975, IS0 2540 - 1973, and IS0 2541 - 1972 published by the International Organization for Standardization (ISO). 1 Scope and field of application Dimensions in mm This standard appl
3、ies to unthreaded 60“ centre holes for general engineering purposes. Centre holes of type R, type A up to and including size 12,5 mm X 26,5 mm, and type B up to and including 10 mm X 21,2 mm are made with type R, A or B centre drills as specified in DIN 333. Type A centre holes above size 12.5 mm X
4、26,5 mm, type B centre holes above size 1 O mm X 21,2 mm and type C centre holes are normally manufactured by means of two or more tools in different, successive operations. For the centring portion of type C centre holes up to and including size 12,5 mm X 26,5 mm or 10 mm X 2 1,2 mm, however, type
5、A or type B centre drills as specified in DIN 333 may be used, since the centring portion is the same for types A, B and C. Unspecified details of the centre holes made with centre drills result from the shape of the centre drill (see Explanatory notes). See DIN 332 Part 7 for the determination of d
6、l for a workpiece mass up to 28 O00 kg. 2 Dimensions, designation 2.1 Type R, radius form, without protective chamfer I L a J Designation of a radius form 60 centre hole without protective chamfer (R), with diameter dl = 4 mm and diameter d2 = 8,5 mm: Centre hole DIN 332 - R 4 X 8,5 Table 1 I For 1)
7、 and 21, see table 2. Continued on pages 2 to 5 Beulh Verlag GmbH. Beriin. has lhe exclusive right of sale for German Standards (DIN-Normen) 10.86 Sales No. O107 DIN 332 Part 1 Engl. Price group COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 2
8、 DIN 332 Part 1 37,5 475 60 75 - 2.2 Type A, straight form, without protective chamfer I 30 l 45 37,5 56 l 47,5 71 120 60 - 60 90 / O 2,5 O 3,15 04 05 O 6,3 08 O 10 12,5 I 593 6,7 8,5 10,6 13,2 17 21,2 26,5 l AI -1 J u Designation of a straight form 60” centre hole without protective chamfer (A), wi
9、th diameter dl = 4 mm and diameter dp = 8,5 mm: Table 2. Centre hole DIN 332 - A 4 X 8,5 I I 4 7,4 11 14.8 22 “I 23,6 31,5 40 85 50 106 0 These sizes are specified in IS0 866 - 1975. 1) In the case of centre holes made with centre drills, dimension t depends on length i2 of the centre drill as speci
10、fied in DIN 333 including re- ground drills. t, is the minimum size of t which will preclude a fully reground 60” centre from contacting the bottom of the hole, provided that the specified diameter d2 is maintained. Dimension t- thus defines the limit up to which centre drills may be reground. 2) Pa
11、rt-off dimension a applies to centre holes which are not left on the workpiece (left unspecified in IS0 866 - 1975, IS0 2540 - 1973 and IS0 2541 - 1972). COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesDIN 332 Part 1 Page 3 01 O 1,25 O 1,6 02 O 2,5
12、2.3 Type B, straight form, with conical protective chamfer Minimum HI2 JS12 Maximum Minimum 2,12 0,3 3,15 2,2 3,5 12,5 26,5 2 33,5 32,l 25,6 38 2,65 0,4 4 2.7 4,5 16 33,5 2,6 42.5 40.1 32.6 48 3,35 0,5 5 3,4 55 20 42,5 3 53 50.5 40,5 60 4,25 0,6 6.3 4,3 6,6 25 53 2.9 63 62,9 50,4 75 120 5,3 0,8 8 5,
13、4 8,3 31,s 67 3.8 80 73.8 638 95 a Designation of a straight form 60“ centre hole with conical protective chamfer (Bi, with diameter dl = 4 mm and diameter d2 = 8,5 mm: Centre hole DIN 332 - B 4 x 8,5 40 50 Table 3. 1 85 4,3 100 99,3 79,3 118 I 1 106 5.5 125 123,5 100,5 150 - OI 1 60 120 COPYRIGHT D
14、IN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 4 DIN 332 Part 1 2.4 Type C, straight form, with truncated protective chamfer (left unspecified in IS0 Standards) Designation of a straight form 60“ centre hole with truncated protective chamfer (C), with di
15、ameter dl = 4 mm and diameter d2 = 8,5 mm: Centre hole DIN 332 - C 4 X 8.5 Table 4. dl d2 tJ d4 d5 f 1) a 2, H12 JS12 Maximum I Minimum 3 Indications on drawings See DIN 332 Part 10 for indication of centre hole on engineering drawings. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicen
16、sed by Information Handling ServicesDIN 332 Part 1 Page 5 Standards referred to DIN 332 Part 7 DIN 332 Part 10 DIN 333 IS0 886 - 1975 “) Centre drills for centre holes without protecting chamfers; type A IS0 2540 - 1973 *) Centre drills for centre holes with protecting chamfers; type B IS0 2541 - 19
17、72 *) Centre drills for radius form centre holes; type Fi Machine tools; 60“ centre holes; dimensioning Centre holes; indicationson drawings 60“ centre drills; types R, A and B Other relevant standards DIN 332 Part 2 DIN 332 Part 4 DIN 332 Part 8 Threaded 60“ centre holes for shaft ends on electric
18、machines Centre holes for axles for railway vehicles 90 centre holes, type S; dimensions, method of determination Previous editions DIN 332 Part 3: 02.43,09.50x DIN 332 Part 1 : 09.22,02.43,09.60, 11.73 Amendments The following amendments have been made in comparison with the November 1973 edition.
19、a) The “Scope and field of application“ clause has been included. b) The example of designation has been amended in compliance with DIN 820 Part 27. c) The table containing indications on drawings has been replaced by a reference to DIN 332 Part 10 d) The standard has been editorially revised. Expla
20、natory notes Centre drills and centre holes are covered by the following IS0 Standards: IS0 866, IS0 2540 and IS0 2541. The centre holes are dealt with in an appendix in each of these international standards. The dimensions of type R centre holes of sizes 1 mm X 2,12 mm up to and including 1 O mm X
21、21,2 mm, type A centre holes of sizes up to and including 1 O mm X 21,2 mm and type B centre holes of sites up to and including 10 mm X 21,2 mm specified in this standard agree with those specified in the appendices of the above IS0 Standards. In order to avoid redundancy of the dimensioning of cent
22、re holes made with centre drills as specified in DIN 333 (up to and including sizes 10 mm X 21,2 mm and 12,5 mm X 26.5 mm), only the dimensions essential for functional and manufacturing reasons are indicated. All the other dimensions derive from the geometry of the centre drill. The larger centre h
23、oles are dimensioned according to the usual rules of drawing practice. For the depth of the centre hole, t, a minimum dimension has been stated which prevents a fully ground 60“ centre point from making contact with the bottom of the hole. Once this minimum dimension is reached, with diameter d2 bei
24、ng maintained, no further regrinding of the centre drill can be carried out unless it is accepted that the centre point may break (see DIN 806 and DIN 807). In order to take into account the shape of the centre point, the depth of the centre hole has been taken to be the distance from the workpiece
25、surface to the bottom of the hole. The dimensions of the centring portion of type B and type C holes, the latter being intended for workpieces machined on the face, are similar to those of type A. International Patent Classification B 23 B 49/04 B 27 C 3/00 “1 IS0 Standards are obtainable from Beuth Verlag GmbH, Burggrafenstrae 6, D-1000 Berlin 30. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling Services
