1、OM: 621.914.2 : 621.833 DEUTSCHE NORMEN February 1952 Reference Profilea of Gear-cutting Tools for 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 rac
2、k tooth system to DIB 867 is generated, the tip circle of the gear being left 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 referenc
3、e 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 N k= f h
4、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 to dedendm Designation of a reference profils for finieh machining (I) for module m 5: 3.5: Reference prof
5、ile 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 to finishing hhr IV = 1,25 - m + 0,6 fi to grinding or shaving hi, 111 = i,% - m + O,% fi 3 3 h, I = 1,167. m h, I
6、I = 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., Page 2 DII 3972 Tooth form for spur gearo and berel geere to D
7、IB 867 hare, definitlom, notation, eymbole to DIB 868 Baric terma and dofinitlone concerning epecifiaation factora and errore relating to apur gaare to DIB 3960 ) Other necessary particulars regarding design and dimensions of gear-outting tools: for hob6 to DIM . and DIM 8002, for pinion type cutter
8、s to DIN 1825 to DIN 1828 I Reference profile IV I- Explanations goference grofile I is intended for tools 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 refer
9、ence profile I does not contact the base of the gear teeth during the finishing operation. It can also be used for tools required to 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
10、cutters. It can also be used for hobs when a fairly large radius is required at the base of the teeth. Furthermore, it may be used for tools required to leave I very soall machining allowance, e.g. for aharing. Reference profile III IiifEIChgl.-cutting nachine is set to the whole depth of tooth requ
11、ired to be left smaller than that yielded by reference profile III, this can be done by increasing the depth setting of the gear-cutting MaChiIIa. This will impart to the gear a dedendua hfr which is greater than 1.25 m. Reference a afgFhChan that yielded by reference profile III (e.g. roughing by a
12、 milling operation, finishing by a shaping operation). Tooth thickness allowances A, , 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 configuration
13、s (e.g. 6fg6-il.-t the base of the teeth), or for the purpose of relieving the dedendum 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 to agreement between the customer an
14、d the tool supplier. Calculation of the quantity hg ofbr vaI of machining allowance or to 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. dth grinding allowance. h, . If the machining allowa
15、nce is rofile IV is intended for tools used for roughing prior to a finishing operation which calls for . representing the depth setting of the gear-cutting machine to give sooe - - Reference profile I A, hg=2167.m- -!% rin ao + lg() 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 per flank, oeasurebperpendicular to the p=0,17; hq=18D 2. A-= 0.2; p = 0,17; h,= la27
