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Hitachi WH12DK Manual

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59
(4) Condições de aperto
O torque de aperto difere segundo a proporção do
torque, a classe e o comprimento dos parafusos
mesmo quando se utilizam aqueles que possuem
roscas do mesmo tamanho. O torque de aperto
também difere de acordo com a condição da
superfície da peça através da qual o parafuso são
apertados. Quando um parafuso e uma porca giram
juntos, o torque é grandemente reduzido.
Torque de aperto
Torque de aperto
Valor do selector Tempo de aperto: seg.
(Espessura da placa de
aço t = 10 mm)
100
80
60
40
20
0
0 123
1000
800
600
400
200
0
1201200
kgf
•
cm
N
•
m
M12 × 45
Parafuso comum
Parafuso de alta
tração
50
40
30
20
10
0
012345678910
500
60600
400
300
200
100
0
kgf
•
cm
N
•
m
M10 × 30 mm Parafuso
de alta tração (Espessura
da placa de aço t = 10 mm)
M8 × 10 mm Parafuso
M4 × 10 mm
Parafuso
M5 × 10 mm Parafuso
M6 × 10 mm
Parafuso
M8 × 30 mm
Parafuso de alta tração
(Espessura da placa
de aço t = 10 mm)
Fig. 14-3Fig. 14-1
Torque de aperto
Tempo de aperto: seg.
(Espessura da placa de
aço t = 10 mm)
Fig. 14-2
100
80
60
40
20
0
0 123
1000
800
600
400
200
0
1201200
kgf
•
cm
N
•
m
M10 × 30
Parafuso comum
Parafuso de alta
tração
Parafuso
Espessura t da placa de aço
Porca
Fig. 15-2
*O seguinte parafuso é usado.
Parafuso comum: grau de resistência 4,8
Parafuso de alta tração: grau de resistência 12,9
)
(
Explicação do grau de resistência:
4 — Limite de resistência do parafuso: 32 kgf/mm
2
8 — Resistência de tração do parafuso: 40 kgf/mm
2
Fig. 15-1
Parafuso
Arruela
Espessura 12 mm
da placa de aço
… 60 …


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