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1、IS UDC 621.9.012 JAPANESE I NDUSTRIAL STANDARD Stock Allowance for Finish Cut JIS B 07 I 2-1969 Translated and Published by Japanese Standards Association 4 s Printed in Japan Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing,
2、 Bernie Not for Resale, 03/10/2007 19:16:01 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S B*712 69 4933608 0008575 5 S Translation without guarantee standard in Japanese is to be evidence i n the event of any doubt arising, the original I Copyright Japanese Standard
3、s Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:01 MSTNo reproduction or networking permitted without license from IHS -,-,- UDC 621.9 .O12 I L JAPANESE INDUSTRIAL STANDARD J I S Stock Allowance for Finish Cut
4、B 0712-1969 (Reaffirmed: 1983) 1. Scope This Japanese Industrial Standard specifies the final stock allowance for finish cut covering the objects the grade of size tolerance of which are generally I T 8 of JIS B 0401 and those superior thereto i n the turning, boring, milling, planing, shaping, slot
5、ting and reaming finish of metallic materials. 2. Definitions The definitions of terms principally used i n t h i s standard shall be as follows : (1) stock allowance for finish cut remaining on the work i n pre-working so that the work can be eco- nomically finish cut t o a specified shape, size an
6、d finish surface roughness. It means the size of spare thickness (2) pre-working It means the working until the f i n a l stock allowance for finish cut is remained. 3. Classification of Stock Allowances f o r Finishes The classification of stock allowances for finish cut specified i n t h i s stand
7、ard, hereinafter referred t o as the “finish allowance“, shall be as follows : (1) Stock allowance for finish turning (2) Stock allowance for finish boring (3) ( 4 ) (5) (6) Stock allowance for finish slotting (7) Stock allowance for finish milling Stock allowance for finish planing Stock allowance
8、for finish shaping Stock allowance for finish reaming I - - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:01 MSTNo reproduction or networking permitted without license from IHS -,-,
9、- J I S B*071E b 4933608 0008577 9 I 2 B 0712-1969 4 . Machining Method and Finish Allowances Finish allowances for respective machining methods and matters influ- encing them shall be as given in following Table. Machining method Slotting oring Milling Planing Shaping Slotting Reaming f inisli Fini
10、sh allowance (mm) 0.1 to 0.5 (relating to diameter) 0.05 to 0.4 (relating to diameter ) 0.1 to 0.3 0.2 to 0.5 0.1 to 0.25 0.1 to 0.2 Finish ameter to di- ameter) I I ,:o 20 - 0.1 to0.5 0.2 to0.7 0.2 t 0 l . O Pfatters influencing finish allowance Inherent matters (1) For the cutting of end surface a
11、nd inner surface, the finish allowance shall be smaller. (2) In the case of using a spring tool for finish, the finish allowance shall be especially 0.05 to 0.15 nun. (3) In the case of using a diamond tool for finish, the finish allowance shall be especially 0.05 to 0.2 mm. (1) In the case where th
12、e boring bar. is cantilever, the finish allowance shall be smaller because it is sometimes deflected due to cutting resistance. (2) In the case of both ends support, it can be made slightly larger than that in the case of (1). (3) In the case of using both cutting edges, it shall be 0.1 to 0.15 mm.
13、(1) In the case of using end m i l l for finish, it is sometimes 0.05 mm. (2) In the case of upward milling, the cutting edge is superficially slided a t the s t a r t of cutting and a specified depth of cut can not be sometimes obtained. Therefore, cares shall be taken thereto. (3) In the case of f
14、ace milling, the finish allowance shall be larger. In the case of using square corner straight tool for finish, it shall be especially 0.03 t o 0.1 mm. In the case of using square corner straight tool, it shall be especially 0.03 to 0.05 mm. In the case of using square corner straight tool, it shall
15、 be especially 0.05 to 0.1 mm (1) To obtain good finished surface and precision, i t is preferable t o cut the object with a slightly smaller finish allowance. cast iron and soft metal with good chip running out, can be slightly larger than that for steel. approx. one half the numerical value given
16、in the l e f t table by pre- working with multi-grooving, lower reaming o r the like. (4) In the case of the hole the length of which is longer i n comparison with its diameter, the finish allowance shall be larger. (2) The finish allowance i n the case of (3) The finish allowance can be made Common
17、 matters (refer to 5.) (1) Rigidity of machine tool (2) Cutting quality of (3) Fitting rigidity of ( 4 ) Quality of materiais to (5) The shape and size of (6) Removal and f i t t i n g of (7) Fitting rigidity of (8) Grade of size tolerance (9) Roughness of finislied (10) Cutting speed (1l)Cutting o
18、i l agents cu t ter cutter be machined materials to be machined materials to be machined materials t o be machined surface Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:01 MSTNo rep
19、roduction or networking permitted without license from IHS -,-,- J I S BM07LF) 69 4933608 0008578 O 3 B 0712-1969 a 5. Common Matters Influencing Finish Allowance The value of finish allowance shall be necessarily determined by suf- ficiently considering various matters given as follows, where there
20、 is a fear that the precision of pre-working and the finish surface are deteriorated by influences of the rigidity and precision of machine tool, tools and their f i t t i n g rigidity, the shape, size, thermal expansion coefficient and f i t t i n g rigidity of materials t o be machined, cutting co
21、nditions or the like, the finish allowance enough t o be able t o remove those affects shall be remained. Further, i n the case (i) Rigidity of Machine Tool high precision and rigidity. Because deflection becomes large and slight waviness a t machine becomes apt t o be generated i n the case where t
22、he rigidity of machine is comparatively low, specified working precision is sometimes difficult t o be obtained, the finish allowance shall be smaller. The machine tool should preferably have In such a case, (2) Cutting Quality of Cutter preferably be good. That is, when the rake angle is too s m a
23、l l and the cutting edge is not sufficiently sharp, specified size precision is difficult to be obtained. In the case where the materials into which a cutter easily cuts (for example, brass), the rake angle of tool shall be smaller. made too large, the specified finish size is difficult t o be obtai
24、ned. The cutting quality of cutter should In that case, when the rake angle of tool is (3) Fitting Rigidity of Cutter The f i t t i n g rigidity of cutter should preferably be high. However, when it is low, the work should prefer- ably be machined at a finish allowance enough to remove the deformati
25、on due to pre-working , which is furthermore as s m a l l as possible. (4) Quality of Materials t o B e Machined finish allowance is, as a rule, not changed according t o the quality of materials to be machined, the finish allowance for especially hard materials shall be smaller. However, when finis
26、h allowance is too small for materials having remarkable work hardening and precipitation hardening, the wear of tool i n the process of finish is considerable and the precision of working is sometimes lowered, Though the standard value of Because the deformation due t o cutting heat is large for ma
27、terials having large coefficient of thermal expansion, they should preferably be machined with a finish allowance enough t o remove the deformation in pre-working, which is furthermore as small as possible. (5). Shape and Size of Materials t o Be Machined length of material t o be machined is remark
28、ably long i n comparison with its diameter and there is a fear of being deflected by cutting resistance, a finish allowance enough t o remove the deformation due t o pre-working, which is furthermore as small as possible, should preferably be remained. thin w a l l materials to be machined. In the c
29、ase where the This applies correspondingly t o the case of Because there is a fear of generating strain due t o the change of internal stress and thermal deformation for unequal shape materials having notch and groove, the finish allowance shall be smaller. Copyright Japanese Standards Association P
30、rovided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:01 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S B807i12 b9 I 4933608 O008579 2 I 4. B 0712-1969 In the case where deflection and slight wavine
31、ss at machine are apt to be generated from the shape and size of materials t o be machined, they should preferably be machined with a smaller finish allowance. Removal and Fitting of Materials to B e Machined In the case of removal and f i t t i n g of materials t o be machined for the purpose of fi
32、nish cut, the finish allowance shall necessarily be made larger taking into count the errors of removal and fitting, Fitting Rigidity of Materials to B e Machined In the case where the f i t t i n g rigidity of materials to be machined is low, there is a possibility that the f i t t i n g condition
33、may be changed by cutting resistance. Therefore, the finish allowance should preferably be smaller. Grade of Size Tolerance In the case where high grade of size tolerance is required, the finish allowance should preferably be smaller. Roughness of Machined Surface Though the finish allowance should
34、preferably be smaller so as t o obtain good machined surface, when the finish allowance is smaller, the structural cutting edge sometimes becomes apt to be adhesive according t o materials to be machined and cutting conditions. However, for the working requiring low speed light cutting such as reami
35、ng, the adherence of structural cutting edge is rather prevented by a l i t t l e smaller finish allowance and good machined surface can be obtained. Cutting Speed In case where the cutting speed can not be made suf- ficiently quick because of the shape and size of materials t o be machined and othe
36、r reasons, when the finish allowance is made smaller, the machined surface is sometimes roughened by the structural cutting edge and otherwise, the specified size and precision can not be obtained. Therefore, the finish allowance should preferably be larger. However, i n the case of reaming, t h i s
37、 does not apply thereto, Further, i n the case of cutting in a range of cutting speed easy t o produce slight waviness at machine, the finish allowance shall be made smaller. Cutting O i l Agent In the case of large cooling capacity of cutting o i l agent, the deformation due to cutting heat is s m
38、a l l and the finish allowance can be made slightly larger. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:01 MSTNo reproduction or networking permitted without license from IHS -,-,
39、- F B 0712-1969 Edition 1 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1969-03-01 Date of Reaffirmation: 1983-06-01 Date of Public Notice in Official Gazette: 1983-07-14 Investigated by: Japanese Industrial Standards Committee Divisional Council on
40、 Machine Elements Technical Committee on Stock Allowance for Finish Cut This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan 0 JSA, 1985 Rinted in Tokyo by Hohbunsha & . , U d . Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:01 MSTNo reproduction or networking permitted without license from IHS -,-,-