Gear Cutting Tools
Hobs - Torion
Hobs - Torion
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Basic hob profiles<br />
to DIN 58412<br />
Symbols:<br />
h fP0 = dedendum of the basic profile<br />
h Pw = distance beween the tooth root<br />
and the end of the straight flank<br />
of the basic profile<br />
h P0 = profile height of the basic profile<br />
h P = profile height of<br />
the gear = cutting depth<br />
s P0 = π · m = tooth thickness<br />
2<br />
ö aP0 = tip radius<br />
ö fP0 = root fillet radius<br />
U 1<br />
}<br />
For gears with basic<br />
N 1 cutter profile<br />
V 1<br />
to DIN 58400<br />
U 2<br />
}<br />
For gears with basic<br />
N 2 cutter profile<br />
V 2<br />
to DIN 867<br />
DIN 58412 – basic profile U I –<br />
topping – 20° pressure angle<br />
h fP0 = 1,1 · m<br />
h Pw = 2,2 · m<br />
h Pw = 2,2 · m<br />
h P =h P0 = 2,6 · m from module 0,1 ÷ 0,6<br />
h P =h P0 = 2,45 · m over module 0,6 ÷ 1<br />
ö aP0 ≈ 0,2 · m<br />
ö fP0 ≈ 0,2 · m max. size<br />
for finishing<br />
Fig. 3.00<br />
DIN 58412 – basic profile N 1 –<br />
non-topping – 20° pressure angle<br />
h fP0 = 1,3 · m<br />
h Pw = 2,4 · m<br />
h P = 2,6 · m from module 0,1 ÷ 0,6<br />
h P = 2,45 · m over module 0,6 ÷ 1<br />
h P0 = 2,8 · m from module 0,1 ÷ 0,6<br />
h P0 = 2,65 · m over module 0,6 ÷ 1<br />
ö aP0 ≈ 0,2 · m<br />
ö fP0 ≈ 0,2 · m max. size<br />
for finishing<br />
Fig. 3.01<br />
DIN 58412 – basic profile U 2 –<br />
topping – 20° pressure angle<br />
h fP0 = 1 · m<br />
h Pw =2 ·m<br />
h P =h P0 = 2,25 · m<br />
ö aP0 = 0,2 · m<br />
ö fP0 = 0,2 · m max. size<br />
for finishing<br />
Fig. 3.02<br />
ö aP0 15°<br />
s P0<br />
hPw h P0<br />
h fP0<br />
ö fP0 20°<br />
ö aP0 15°<br />
s P0<br />
h P hPw h P0<br />
h fP0<br />
ö fP0 20°<br />
s P0<br />
ö aP0 15°<br />
hPw h P0<br />
ö fP0 20°<br />
h fP0<br />
DIN 58412 – basic profile N 2 –<br />
non-topping – 20° pressure angle<br />
h fP0 = 1,2 · m<br />
h Pw = 2,2 · m<br />
h P = 2,25 · m<br />
h P0 = 2,45 · m<br />
ö aP0 = 0,2 · m<br />
ö fP0 = 0,2 · m max. size<br />
for finishing<br />
Fig. 3.03<br />
ö aP0 15°<br />
s P0<br />
hPw h P0<br />
h fP0<br />
ö fP0 20°<br />
DIN 58412 – basic profile V 1 –<br />
non-topping – 20° pressure angle<br />
h fP0 = 1,3 · m<br />
h P = 2,6 · m from module 0,3 ÷ 0,6<br />
h P = 2,45 · m over module 0,6 ÷ 1<br />
h P0 = 2,8 · m from module 0,3 ÷ 0,6<br />
h P0 = 2,65 · m over module 0,6 ÷ 1<br />
s P0 = π · m – 2q<br />
2 cos α<br />
ö aP0 = 0,1 · m<br />
ö fP0 = 0,2 · m max. size<br />
q = 0,05 · m + 0,03<br />
for pre-machining<br />
Fig. 3.04<br />
h P<br />
h P<br />
ö fP0<br />
20°<br />
ö aP0<br />
s P0<br />
q<br />
h fP0<br />
h P0<br />
DIN 58412 – basic profile V 2 –<br />
non-topping – 20° pressure angle<br />
h fP0 = 1,2 · m<br />
h P = 2,25 · m<br />
h P0 = 2,45 · m<br />
s P0 = π · m – 2q<br />
2 cos α<br />
ö aP0 = 0,1 · m<br />
ö fP0 = 0,2 · m max. size<br />
q = 0,05 · m + 0,03<br />
for pre-machining<br />
h P<br />
ö aP0<br />
ö fP0<br />
20°<br />
s P0<br />
q<br />
h fP0<br />
h P0<br />
Fig. 3.05<br />
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