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Parameter:
The following parameters are used in the screwing sample:
• Maximum time until the cut-out torque is reached (monitoring time)
• Cut-out torque, cut-out torque min/max
• Rotation speed
• Torque holding time
• Angle of rotation: yes / no
if angle monitoring is switched on the following parameters are added:
◦ Holding torque for angle measurement
◦ Angle lower limit / angle upper limit
10.1.2 Expanded screwing to torque
The screwing sample screwing to torque is a tightening process with deactivation to the
torque. An angle monitoring is possible as an option.
Figure 37: Expanded screwing to Torque
Sequence of the screwing sample:
At the start of the screwing level the time monitoring is started. At the start of the level
screwing is done with rotation speed 1. Once the dwelling torque has been reached, the
rotation speed is changed to rotation speed 2. Cyclic torque measurements are performed.
If the angle of rotation monitoring option is activated then angle measurements are
performed additionally starting at the selected dwell torque.
Switching off criteria:
The screwing process is ended once the
• cut-out torque is reached
• the maximum screwing time (monitoring time) is expired
• the maximum angle of rotation is reached (only for angle monitoring)
Analysis:
OK evaluation:
The screwing level is considered OK (fault free), if the switching off occurs via
the moment and the value of the torque is in the set limits.
On the angle of rotation monitoring option the reached angle must be within the
set limits.
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