Gear Cutting Tools
Hobs - Torion
Hobs - Torion
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The effect of cutter deviations and cutter clamping<br />
errors on the gear (for single-start hobs with 20° pressure angle and relief rake angle of approx. 10°)<br />
The quality of a hobbed gear is the<br />
product of the interaction of various<br />
components and production<br />
conditions.<br />
The deviations from the intended<br />
geometry of the hob and the<br />
clamping errors of the cutter on<br />
the hobbing machine play an important<br />
part in this.<br />
In hobbing, a distinction is made<br />
between the deviations on the enveloping<br />
helix of the cutter and the<br />
deviations on the cutting faces of<br />
the cutter.<br />
The deviations of single-start hobs<br />
affect the quality of the gear mainly<br />
in the form of profile deviations.<br />
It is here important to know in<br />
which order of magnitude the deviations<br />
on the hob and clamping errors<br />
of the cutter affect gear quality.<br />
Hobs<br />
Nature of the<br />
deviation<br />
Designation and symbols of the<br />
deviation acc. to VDI 2606<br />
Item no. & symbol of the<br />
deviation acc. to DIN 3968 (-<br />
Sept. 1960)<br />
Representation of the deviation<br />
Deviations on the<br />
enveloping helix<br />
of the hob<br />
Total base pitch deviation F pe within an<br />
engagement area<br />
No. 17<br />
F e<br />
Path of contact<br />
Tip<br />
Root<br />
Cutter lead height deviation in the<br />
direction of start F HF between any<br />
cutting edges in one convolution<br />
No. 15<br />
F HF<br />
Profile formation zone<br />
p z<br />
Radial runout f ra on the tooth tip<br />
No. 6<br />
f rk<br />
1 cutter turn<br />
Tooth thickness deviation f s on the<br />
basic reference cylinder<br />
No. 13<br />
f s<br />
f s<br />
No. 12<br />
Form deviation F fS of the cutting edge<br />
F fS<br />
Active profile height<br />
Tip<br />
Root<br />
Deviations<br />
on the cutting<br />
faces of the hob<br />
Form- and position-deviation F fN<br />
of the cutting faces<br />
No. 7<br />
F fN<br />
active profile height<br />
Tip<br />
Root<br />
Cumulative pitch deviation F pN<br />
of the gashes (cutting faces)<br />
No. 10<br />
F tN<br />
1Hob revolution<br />
Gash lead deviation f HN over 100 mm<br />
cutter length<br />
No. 11<br />
f HN<br />
Profile zone generating<br />
100<br />
Clamping errors<br />
of the hob on the<br />
hobbing machine<br />
Radial runout f rP on the two indicator<br />
hubs<br />
No. 4<br />
f rP<br />
1 Hob revolution<br />
Axial runout f rx on the clamping faces<br />
No. 5<br />
f ps<br />
1 Hob revolution<br />
132