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fundamentos para o projeto de componentes de máquinas

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Verificação ao <strong>de</strong>sgaste:<br />

P =<br />

M<br />

v<br />

2⋅<br />

M ⋅cos<br />

α<br />

=<br />

mn<br />

⋅ Z<br />

2⋅<br />

6000⋅<br />

0,<br />

93<br />

P =<br />

= 200 Kg<br />

4⋅14<br />

P = l * p ⋅C<br />

⋅ C (21)<br />

adm<br />

l* = 1,5 . K . mn = 1,5 . 10 . 4 = 60,0 mm<br />

p<br />

f<br />

mn<br />

⋅π<br />

4⋅π<br />

= = = 13,<br />

6 mm<br />

cosα<br />

0,<br />

93<br />

sen2β<br />

Z<br />

⋅ Z<br />

+ E<br />

f 1 2 1 2 2<br />

C f = ⋅ ⋅ ⋅σ<br />

adm<br />

4,<br />

4 Z1<br />

+ Z 2 E1<br />

⋅ E2<br />

tan β n tan 20º<br />

tan β f = = = 0,<br />

391 βf = 21º30’<br />

cosα<br />

0,<br />

93<br />

R = 4/1<br />

HB = 3 σr<br />

σ<br />

c adm<br />

=<br />

E<br />

Z1 = 14 Z2 = 56<br />

0,<br />

5<br />

⋅<br />

H B<br />

g<br />

10<br />

σr = 60 HB = 180<br />

6<br />

g = 60 n n hf = 60 . 1200 . 20000 = 1,44 X 10 7<br />

Logo:<br />

=<br />

90<br />

= 26,<br />

9<br />

1440<br />

σ adm<br />

σadm<br />

4<br />

2 = 720<br />

Substituindo estes valores teremos:<br />

C f<br />

4<br />

0,<br />

68 14⋅<br />

56 4,<br />

2×<br />

10<br />

= ⋅ ⋅ ⋅720<br />

= 0,<br />

12<br />

8<br />

4,<br />

4 14 + 56 4,<br />

41×<br />

10<br />

Padm ≤ 60,0 . 13,6 . 0,12 . 0,63 Padm ≤ 66,5 200 ≤ 66,5<br />

teremos portanto que recalcular Cf.<br />

200 ≤ 60,0 . 13,6 . 0,63 . Cf’<br />

Cf’ = 200/55,5 = 0,36<br />

Cf<br />

K . σc adm 2<br />

f<br />

f<br />

v<br />

364

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