Hitachi WH 12DMR, Технические данные и руководство по обслуживанию

Страница: 19 / 47

--- 16 ---
•
Model WH 12DMR
Tightening time: sec.
(Steel plate thickness
t = 10 mm)
200
(174 in-lbs.)
0 1 2 3
400
(347 in-lbs.)
600
(521 in-lbs.)
800
(694 in-lbs.)
1000
(868 in-lbs.)
M10 x 30
T
ightening torque
High-strength bolt
0
0
20
40
60
80
100
Tightening time: sec.
(Steel plate thickness
t = 25 mm)
0 1
2 3
Tightening time: sec.
(Steel plate thickness
t = 25 mm))
M14 x 50
High-strength bolt
Ordinary bolt
0 1 2 3
M12 x 45
T
ightening torque
High-strength bolt
0 0
20
40
60
80
100
Ordinary bolt
Ordinary bolt
120
140
1200
(1042 in-lbs.)
1400
(1215 in-lbs.)
0
20
40
60
80
100
120
140
200
(174 in-lbs.)
400
(347 in-lbs.)
600
(521 in-lbs.)
800
(694 in-lbs.)
1000
(868 in-lbs.)
T
ightening torque
0
1200
(1042 in-lbs.)
1400
(1215 in-lbs.)
200
(174 in-lbs.)
400
(347 in-lbs.)
600
(521 in-lbs.)
800
(694 in-lbs.)
1000
(868 in-lbs.)
kgf cm N m
kgf cm N m
kgf cm N m
7-3-3. Bolt tightening torque characteristics
Figures. 6-1 and 6-2 show relationships between time and tightening torque for individual bolt types and sizes.
While the data are useful for handy reference, actual tightening torque will vary depending on tightening
conditions and other variables. For details, please refer to Para. 8-3, "Tightening Torque Variation".
NOTE
•
The term "tightening time" indicates the impact time after the lower surface of the bolt has come in contact with
the material into which it is being tightened.
•
In the tightening conditions shown in Figs. 6-1 and 6-2, the screws are being tightened directly into a steel
plate; accordingly, the torque goes up very abruptly in comparison with ordinary bolt tightening conditions.
Fig. 6-2
Bolt
Nut
Steel plate thickness: t
* The following bolts were utilized:
Ordinary bolt; strength grade 4.8
High-strength bolt; strengh grade
12.9
Strength grade is read as follows:
4.8
Yield point or durable force:
(45,500 psi)
Tensile strength of the bolt:
(56,900 psi)
•
Model WR 12DMR
Tightening time: sec.
(Steel plate thickness
t = 10 mm)
500
(434 in-lbs.)
0
1
2 3
1000
(868 in-lbs.)
1500
(1302 in-lbs.)
2000
(1763 in-lbs.)
M10 x 30
T
ightening torque
High-strength bolt
0
0
50
100
150
200
Ordinary bolt
Tightening time: sec.
(Steel plate thickness
t = 25 mm)
0 1
2 3
M12 x 45
T
ightening torque
High-strength bolt
0
0
50
100
150
200
Ordinary bolt
Tightening time: sec.
(Steel plate thickness
t = 25 mm)
0
1
2 3
M14 x 50
T
ightening torque
High-strength bolt
0 0
50
100
150
200
Ordinary bolt
500
(434 in-lbs.)
1000
(868 in-lbs.)
1500
(1302 in-lbs.)
2000
(
1763
in-lbs.)
500
(434 in-lbs.)
1000
(868 in-lbs.)
1500
(1302 in-lbs.)
2000
( 1763 in-lbs.)
kgf cm
N m
kgf cm N m
kgf cm N m
Fig. 6-1