Page 293 - HAZET哈蔡特2024英文样本

Torque technology

Increased screw connection quality through

improvement in the screw tightening

Torque + Rotation angle
sTAC controlled tightening process
Accuracy / Precision of the screw connection ➧ ➧ ➧ ➧ ➧ ➧ 6000 CT Torque controlled

sTAC

tightening process

5000 CT

tightening process,
not monitored
Impact wrench Machine-operated
Manually operated
tightening process,
not monitored
Wrenches

The complete screw connection is only OK (Fig. 3)
if the torque and rotation angle are both OK

1 2 3

Torque Torque Torque

Torque O K. Rotation Torque not OK. Rotation Torque O K Rotation
Rotation angle not O K. angle Rotation angle O K. angle Rotation angle O K. angle
Important: In particular for the joints using threaded fasteners of the category A (according to VDI guideline 2862),
e.g. belt, airbag or rotor blades for wind energy plants!
Figure 1: Figure 2:
The torque is reached, but the rotation The rotation angle is reached, but the
angle isn‘t. – Possible causes: torque isn‘t. – Possible causes:
• Use of an incorrect screw that is too long. • Use of an incorrect screw that is too short
and the thread has been ripped out.
• The component to be screwed is too thin, screw
or nut is stuck in the end of the thread. • Use of an incorrect screw with insufficient strength.
• The head and / or thread friction are too high because • The head and / or thread friction are too low because the
the surfaces are too rough and the screw has possibly screw coating is incorrect. • Use of an incorrect screw.
„jammed“, for example. The coating of the screw is not • Use of an incorrect lubricant.
correct because a screw with a different coating was
used or the coating is incomplete. There is not sufficient • The screw or the thread is damaged or
lubrication or an incorrect lubricant has been used. the thread has been ripped out.
• Screw or thread is damaged. • Installation of an incorrect seal that is too soft.
• Thread is incorrectly cut and not deep enough.
• There are chips from the thread cutting in the blind hole.
• A washer or a seal has been forgotten
and the screw is in place.

Components and spare parts from page 500 to 509 Errors excepted 291