1、UDC 621.914 : 621.833 DEUTSCHE NORMEN January 1955x I Metal-cutting Tools Hobs for Spur Gears Modules 1 to 20 with Clutch Drive Slot or Keyrey 8002 Yaechinenrerkseuge fr Metall; Wlsfrser itlr StirnrMer, miit Quer- oder Lbgsnut, Modul I bis 20 Dimenslone in mm The design need not correspond to the il
2、lustration. B with kegray A with clutch drive slot r r Designation of a spur gear hob with ke (B), single-start (I), left-hand (leftyqith .tooth form to reference profile III (BP 1II)I) for module 3.5 without taper in . 2) : ay Hob A2 right BP III x 3.5 mA DIN 8002 - . Hob BI left BP III x 3.5 DIN 8
3、002 - . Por intermediate sizes of module m the following values apply to %: m to1 1.4 1 1.8 I 2.241 2.8 13.66 I 4.6 I 6.6 1 7.1 I 9 111.2 I 50 I 56 I 63 I 70 I 80 I 90 I100 Il10 I126 1160 B u i 1 t - u p the above where necessary. hobs economizing in high speed steel may be given dimensions differin
4、g from Footnotes see on page 2 Continued on page 2 Alleinverkauf der Normbltter durdi Beuth-Vertrieb GrnbH, Berlin 15 und Kln DIN 8002 engl. Preisw.2 Pae 2 DIX 8002 I) Tooth form according to DIN 3972. Alternative forms to be epecially Indicated when oder*. 2, Material to be stated when ordering 3,
5、Observance of these dimensions is recommended to manufacturers. They correspond to a “) The spiral direction of the gashes is opposite to the direction of rotation of the hob. g%ni.ng& to be stated when ordering 5, The gashes may also be parallel with the hob axis. Hobs of this kind are marked with
6、the spbolco for the gash lead. The setting angle for sharpening is OO. In such cases the designation reads, for example: In such cases the designation reads, for exapple: Hob A 2 riet 3.5 mA DIn 8002 - .e wlth reference Droflle accordinn to drawing clearance angle of 8O at the tooth tip. Hob A2 righ
7、t BP III x 3.5 mi DIB 8002 - . parallel Rashes 6, Tapering or rounding for hobbing helical gears shall be specially indicated by the letters m when ordering (see first example of designation). Unless ordered otherwise, the tapering or rounding is provided at the leaving end of the hob. 7, Driving sl
8、ots and keyways and bore recess according to DIN I38 For use on expanding hob arbors the bore must not be recessed. In such cases the designation reads, for example: Hob A2 right BP III X 3.5 mA DI19 8002 - . bore without recess !PA-k6i Hobs conforming to this Standard are to be marked with the foll
9、oning particulars: Module, -le of action, setting angle for hobbing, tooth form, gash lead, material, manufacturers symbol, serial number. (if the gashes are parallel with the hob axis, the symbolis used instead of the gash lead,) Setting angle for hobbing ufacturere symbol Serial number Other relev
10、ant standards: For reference profile of gear-cutting tools for involute tooth systems accordhg to DIN 867, see DIN 3972 For bores, keyways and driving features for tools with parallel bore, see DIN 738 For design dimenaloris and tolerances of hobs for involute spur gears, fundamental terms, see DIB 8oOO For tolerances on single-start hobs for involute spur gears,see DIN 3968 Bor moule seriea for spur gears,see DIN 780
