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1、J IS JAPANESE INDUSTRIAL STANDARD Special Tolerances for Reamers JIS B 4 4 1 4 - 1 9 9 0 . J I S B*4434 90 m 4933608 0033665 9 m UDC 621.951.7:621.753.1 4 s I II Translated and Published bY Japanese Standards Association Printed in Japan Copyright Japanese Standards Association Provided by IHS under
2、 license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:20:38 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S EX4414 90 W 4933608 0013bbb O = In the event of any doubt arising, the original Standard in Japanese is to be fina
3、l authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:20:38 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S Br44L4 90 = 4933608 0013bb7 2 m UDC 621
4、.951.7:621.753,1 JAPANESE INDUSTRIAL STANDARD J r s Special Tolerances for Reamers B 4414-1990 1. Scope This Japanese Industrial Standard specifies the method of determining the dimensional tolerances on the diameter of reamers used mainly for iron and steels in the case where the per- missible devi
5、ations in the bore diameter of the workpiece is given. Remarks 1. The permissible deviations in the diameter of reamers shall conform to m5 un- less otherwise specified. However, because the over size of a reamer-finished bore diameter and the tool life vary with the workpiece, the machine and reame
6、r used, and the cutting conditions, the permissible deviations in the diameter of reamers must be determined by taking these factors into consideration. 2. The contents of this Standard coincide with those of IS0 522. 2. Definition The definitions of the main terms used in this standard shall be as
7、specified in JIS B 0173. 3. Method of Determining Dimensional Tolerances Fig. 1. Dimensional Tolerances for Reamers J I 5 Br44L4 90 = 4933608 0013bb7 2 m UDC 621.951.7:621.753,1 JAPANESE INDUSTRIAL STANDARD J r s Special Tolerances for Reamers B 4414-1990 Applicable Standard: JIS B 0173-Glossary of
8、Terms for Reamers Corresponding International Standard: IS0 522 Special tolerances for reamers Reference Standard: JIS B 041-System of Limits and Fits Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 0
9、3/10/2007 07:20:38 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S B*4414 90 W 4933b08 0013668 4 W 2 B 4414-1990 3.1 Tolerance for Reamer and Over Size The tolerance for the reamer and the over size shall be determined from the following formulae (refer to Fig. 1). Tc
10、 = 0.35 Tw To = 0.15 Tw Tw = Aw - Bw, or Tw = aw - bw tolerance on reamer diameter (mm) over size of bore diameter (mm) tolerance on bore diameter of workpiece (mm) maximum permissible dimension of bore diameter of workpiece (mm) minimum permissible dimension of bore diameter of workpiece (mm) upper
11、 permissible deviation in bore diameter of workpiece (mm) lower permissible deviation in bore diameter of workpiece (mm) The values of Tc and To shall be expressed in units of 0.001 mm by rounding up the sig- nificant figure in the lower place as a unit. mum permissible dimensions of reamer diameter
12、 shall be determined from the following formulae (refer to Fig. 1). 3.2 Permissible Limit Dimensions for Reamers The maximum permissible dimension and mini- Ac = A w - To Bc = Ac - Tc where, Ac : maximum permissible dimension of reamer diameter (mm) Bc : minimum permissible dimension of reamer diame
13、ter (mm) Example: Permissible Limit Dimensions for Reamer Where maximum permissible dimension of workpiece bore diameter Aw = 12.018 mm and minimum permissible dimension of workpiece bore diameter Bw = 12.000 mm (1) Tolerance on workpiece bore diameter Tw = Aw - Bw = 12.018 mm - 12.000 mm = 0.018 mm
14、 (2) Tolerance on reamer diameter Tc = 0.35 Tw = 0.35 X 0.018 mm = 0.0063 mm hence, Tc = 0.007 mm (value after rounding up) (3) Over size of bore diameter To = 0.15 Tw = 0.15 X 0.018 mm = 0.0027 mm hence, To = 0.003 mm (value after rounding up) (4) Maximum permissible dimension of reamer diameter Ac
15、 E Aw - To = 12.018 mm - 0.003 mm = 12.015 mm (5) Minimum permissible dimension of reamer diameter Bc = Ac - Tc = 12.015 mm - 0.007 mm = 12.008 mm 12 015 hence, the permissible limit dimensions of the reamer are determined as 121008 mm Copyright Japanese Standards Association Provided by IHS under l
16、icense with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:20:38 MSTNo reproduction or networking permitted without license from IHS -,-,- , J I S B*4YE4 90 4933608 O013669 b 3. B 4414-1990 3.3 Permissible Deviations for Reamer The upper permissible deviation a
17、nd lower permis- sible deviation in reamer diameter shall be determined from the following formulae (refer to Fig. 1). a, = aw - To bc = a, - Tc where, a, : upper permissible deviation in reamer diameter (mm) bc : lower permissible deviation in reamer diameter (mm) Example: Permissible Deviations fo
18、r Reamer +0.033 mm Where the bore diameter of workpiece is 25 o (1) Tolerance on workpiece bore diameter Tw = aw - bw = 0.033 mm - O mm = 0.033 mm (2) Tolerance on reamer diameter Tc = 0.35 Tw = 0.35 x 0.033 mm = 0.01155 mm hence, Tc = 0.012 mm (value after rounding up) (3) Over size of bore diamete
19、r To = 0.15 Tw = 0.15 x 0.033 mm = 0.00495 mm hence, To = 0.005 mm (value after rounding up) (4) Upper permissible deviation in reamer diameter a, = aw - To = + 0.033 mm - 0.005 mm = + 0.028 mm (5) Lower permissible deviation in reamer diameter bc = a, - Tc = + 0.028 mm - 0.012 mm = + 0.016 mm hence
20、, the permissible deviations for the reamer is determined as +o:o16 mm +o028 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:20:38 MSTNo reproduction or networking permitted without lice
21、nse from IHS -,-,- J I S 8*4434 90 4933608 0033670 2 B 4414-1990 Edition 1 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1990-06-01 Date of Public Notice in Official Gazette: 1990-06-12 Investigated by: Japanese Industrial Standards Committee Divisi
22、onal Council on Machine Elements Technical Committee on Milling Cutters and Reamers This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan O JSA, 1991 Printed in Tokyo by Hohbunsha Co., Ltd. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:20:38 MSTNo reproduction or networking permitted without license from IHS -,-,-