Torque curve is the main tool for the assembly analysis and study.
This curve is obtained while fully threading the screw until assembly failure and torque values for each angle or time increment during all the process is registered.
By analysing the torque curve, our application engineers find a lot of valuable information for the customers about the performance of the screw in the assembled parts related to:
To obtain the maximum output of this test, it's very important to know and understand properly the information provided in the torque curve.
The curve below depicted corresponds to tightening of REMFORM® screw diameter 6 on PBT+30GF plastic part.
Threading zone: corresponds to torque and angle values until the head of the screw touches the cover part. In this zone we find the following parameters:
Tightening zone: it corresponds to torque and angle values just after clamp load is just started until the part fails.
Failure zone: it covers torque and angle values once clamp load is lost.
The stability of the assembly is determined by the difference between Threading torque and Failure torque.