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1、INTERNATIONAL STANDARD 522 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEYYH4POflHA3 OPTAHIZ3JA”MII “0 AHAPTMSAUMM.ORGAN,SAT,ON ,NTERNAT,ONALE DE NORMALlSATlON Special tolerances for reamers Tol these documents are now in the process of being transformed into International Standards. As part of
2、this process, Technical Committee ISO/TC 29 has reviewed IS0 Recommendation R 522 and found it technically suitable for transformation. International Standard IS0 522 therefore replaces IS0 Recommendation R 522-1966 to which it is technically identical. IS0 Recommendation R 522 was approved by the M
3、ember Bodies of the following countries : Australia Austria Belgium Brazil Canada Chile Colombia Czechoslovakia Denmark France Germany Hungary India Italy Japan Korea, Rep. of Netherlands New Zealand Poland Portugal Spain Sweden Switzerland United Kingdom U.S.S.R. Yugoslavia The Member Body of the f
4、ollowing country expressed disapproval of the Recommendation on technical grounds : U.S.A. The Member Body of the following country disapproved the transformation of ISO/R 522 into an International Standard : Sweden 0 International Organization for Standardization, 1975 ? Printed in Switzerland Copy
5、right International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 22:29:51 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 522-1975 (E) Special tol
6、erances for reamers 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies the special tolerances to be applied to the diameter of the cutting portion of the hand and machine reamers covered by ISO/R 236, Hand reamers and long fluted machine reamers, Morse taper shank, and ISO/R 521,
7、 Machine chucking reamers with parallel shanks or Morse taper shanks, when a grade of accuracy other than the standard stock grade (with m6 tolerance) provided for in these IS0 Recommendations is required. 2 DETERMINATION OF TOLERANCES Unless otherwise specified in the order, reamers are made to the
8、 tolerance m6 (standard stock grade) and it is impossible to infer in advance what tolerances can be guaranteed on the holes produced with these tools. The actual diameter of a hole produced by a given reamer depends in practice on very many factors. These factors include : a) the type of material t
9、o be cut and the amount of material to be removed; b) the cutting angle of the reamer; c) the condition of the reamer at the time of use; d) the method of mounting and operation; e) the lubrication. These different factors should be taken into account when determining the special tolerances to be ca
10、lled for on a reamer for the production of a hole with a given tolerance. It is thus impossible to establish, for this type of application, standard “special” tolerances likely to give guaranteed results under all conditions. In order to obtain uniformity, however, it is recommended that the method
11、shown below for determining the limits of tolerance on the reamer in relation to those of the hole to be produced should be adopted for special reamers wherever possible. 2.1 Rule for determining the limits of tolerances on reamers For a given hole with IT tolerance : - the high limit of the diamete
12、r of the reamer is equal to the maximum diameter of the hole, minus 0,15 IT. The value 0.15 IT should be rounded upwards to a whole multiple of 0,001 mm (or 0.000 1 in). - the low limit of the diameter of the reamer is equal to its maximum diameter, minus 0.35 IT. The value 0.35 IT should be rounded
13、 upwards to a whole multiple of 0,001 mm (or 0.000 1 in). NOTE - For inch size reamers, the IT values are obtained by direct conversion from the metric IT values. Tolerances on the hole ,- Ln on the reamer 2.2 General remark It is always possible to make reamers with greater precision than that prov
14、ided for by this International Standard, while remaining within the limits specified above. 2.3 Examples 2.3.1 For a 72 H7 hole in millimetres IT7 = 0,018 mm Hole sizes : max. 12,018 mm, min. 12,000 mm The high limit of the diameter of the reamer is 0.15 IT below the maximum diameter of the hole : 0
15、,15 x 0,018 mm = 0,002 7 mm which is rounded to 0,003 mm Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 22:29:51 MDTNo reproduction or networking permitted without license from
16、IHS -,-,- IS0 522-1975 (E) High limit of the diameter of the reamer = 12,018 mm - 0,003 mm = 12,015 mm The low limit of the diameter of the reamer is 0.35 IT below the high limit of the diameter of the reamer : 0,35 x 0,018 mm = 0,006 3 mm which is rounded to 0,007 mm Low limit of the diameter of th
17、e reamer = 12,015 mm - 0,007 mm = 12,008 mm 2.3.2 For a 0,s H7 hole in inches IT7 = 0.000 7 in (direct conversion of 0,018 min) Hole sizes : max. 0.500 7 in, min. 0.500 0 in The high limit of the diameter of the reamer is 0,15 IT below the maximum diameter of the hole : 0.15 X 0.000 7 in = 0.000 10
18、in which is rounded to 0.000 1 in High limit of the diameter of the reamer = 0.500 7 in - 0.000 1 in = 0.500 6 in The low limit of the diameter of the reamer is 0,35 IT below the high limit of the diameter of the reamer : 0.35 x 0.000 7 in = 0.000 24 in which is rounded to 0.000 3 in LOW limit of th
19、e diameter of the reamer = 0.500 6 in - 0.000 3 in = 0.500 3 in Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 22:29:51 MDTNo reproduction or networking permitted without license from IHS -,-,-