标准规范文件：DIN 3972-1952-en

1、OM: 621.914.2 : 621.833 DEUTSCHE NORMEN February 1952 Reference Profilea of Gear-cutting Tools f o r Involute Tooth System to DIB 867 39 72 Bemgeprofile von Versahnnerkseugrn fr Evolventen-Versahen nach DIR 867 Dimensiom in lpl The reference profile of a gear-cutting tool io that profile whereby a r

2、ack tooth system t o DIB 867 is generated, the t i p circle of the gear being l e f t untouched by the goarccutting tool. The tooth thichieem Is governed by the standard of machining aocuracy required. Believing of th4 base of the teeth of the cutting tool lm peniitted. The addendum is detailed for

3、reference pro- fileil I, II, III and IV (see Bxglanatiom on page 2) which are seleoted to suit the machining standard required. Reference Profilem of Tool Cub. hl, = h , I (= 1,167 - m) or h, II (= 1.25. ml h, f 2,367. m for reference profile I w = h, S 2.45 1 m for reference profilee II, e III and

4、N k = f h I working depth, =%ich for tool and gear is the whole depth of tooth of the gear (mm) p = machining allowance per flank -script s relating to tool relating to gear relating to addendum relating t o dedendm Designation of a reference profils for finieh machining (I) for module m 5: 3.5: Ref

5、erence profile I x 3.5 DIN 3972) Boference profile I Reference profile II Reference profile III Reference profile IV for finish-machining for finish-machining for roughing prior for roughing prior t o finishing hhr IV = 1,25 - m + 0,6 fi t o grinding o r shaving hi, 111 = i,% - m + O,% fi 3 3 h , I

6、= 1,167. m h , II = 1.25 m he tooth thicknos6 Sor of a gear at the pitch circle is as follows for a dedendm hir of: Continued on page 2 For Footnote 1) see page 2 einverkauf der Normbltter durch buth-Vemieb GmbH, Bodin W IS und Kan DIB 3972 e. Preisgr., Copyright Deutsches Institut Fur Normung E.V.

7、Provided by IHS under license with DIN Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- Page 2 D I I 3972 Tooth form for spur gearo and berel geere t o DIB 867 hare, definitlom, notation, eymbole to DIB 868 Baric terma and dofinitlone concerning epecifiaation fact

8、ora and errore relating t o apur gaare to DIB 3960 ) Other necessary particulars regarding design and dimensions of gear-outting tools: for hob6 t o DIM . and DIM 8002, for pinion type cutters t o DIN 1825 t o DIN 1828 I Reference profile IV I - Explanations goference grofile I is intended for tools

9、 with which a tooth system is finish-cut, e.8. hobs, gear milling curr;r;?ak-oFrars. When the tooth system has been roughed out by tools having a reference profile III or IV, the tool with reference profile I does not contact the base of the gear teeth during the finishing operation. It can also be

10、used for tools required t o leave a very mall machining allowance, e.g. for shaving. Reference Erofile II is likewise intended for tools with which a tooth systeo is finish-cut, e.g. pinion type cutters. It can also be used for hobs when a fairly large radius is required at the base of the teeth. Fu

11、rthermore, it may be used for tools required t o leave I very soall machining allowance, e.g. for aharing. Reference profile III IiifEIChgl.-cutting nachine is set t o the whole depth of tooth required t o be l e f t smaller than that yielded by reference profile III, this can be done by increasing

12、the depth setting of the gear-cutting MaChiIIa. This w i l l impart t o the gear a dedendua hfr which is greater than 1.25 m . Reference a a f g F h C h a n that yielded by reference profile III (e.g. roughing by a milling operation, finishing by a shaping operation). Tooth thickness allowances A ,

13、, applied, for example, in order to impart backlash, can be obtained by varyI,-F6C-apf6-F-he gear-cutting nachine. Tool profile modifications undertaken for the purpose of securing better profile entry configurations (e.g. 6fg6-il.-t the base of the teeth), or for the purpose of relieving the dedend

14、um of the gear to obtain easier finishing by shaving (by giving the addendum more thickness) are not standardlted. Cutters of these types count as special designs and are subject t o agreement between the customer and the tool supplier. Calculation of the quantity hg ofbr vaI of machining allowance

15、or t o obtain a specific value of backlash through the application of tooth thickness allowances: - - - is intended for tools used for roughing the gear teeth, 0.6. d t h grinding allowance. h, . I f the machining allowance is rofile IV is intended for tools used for roughing prior t o a finishing o

16、peration which calls for . representing the depth setting of the gear-cutting machine to give sooe - - Reference profile I A , hg=2167.m- -!% rin ao + l g ( ) Reference profile II hg=2,25.m - P Asn sin ao + (m I Reference Profile III (mm) Am 3 hg=2,25.m+0,6fi - - ! ! - sin e , , + 2(ga 3 p = (h, IV - h,) - sina = 46 - )/nI - sin a , , p = a,= pressure angle machining allowance