TRICONEX PM6301A Power AC module

changes depending on the connection state between the thread and bolt seat surface. There is considerable scatter even for bolts and tapping even when manufactured under the same conditions. As shown in the gure on the left, when fastening to the target torque T with the torque method, the axial force of the bolt shows the scatter N1 because of the difference in torque coefcient, even when the torque is constant. However, with the angle method fastening for the constant angle ø1 from the snug point, the scatter of the axial force becomes N2, which is smaller than with the torque method. When the fastening angle is made ø2 and fastening is performed within the elastic range of the bolt, the scatter of the axial force becomes N3, which is still smaller. Accordingly, for execution of fastening without loosening, it is necessary to select the fastening method according to the fastening conditions for the object to be fastened and the conditions at the time of product design.

Pre Fastening Monitoring

2 types of pre-fastening monitor functions are available. Seizing monitor and Section monitor. Seizing monitor is set by monitoring the angle once seat torque has been detected. The torque value is monitored when the angle changes by one degree or more and the monitor checks whether the torque value is within range of the set monitor min, and monitor max torque. Section monitor checks whether the torque value is within the range set with Monitor Max torque, and Monitor Min torque.

Self Tapping Function

This function is used when a large torque is generated in the initial stage and this torque exceeds the seating torque as in the case of a tapping screw. After the start of pre fastening, the seating torque is not detected in the zone set with a Self Tap Interval, and peak hold of the torque detected in this zone is performed. It is checked whether the detected peak torque is within the range set with Self Tap Max Torque and Self Tap Min Torque. A judgment for the upper limit torque is always made during monitoring. A judgment for the lower limit torque is made after the completion of monitoring.

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