Frequently Asked Questions
Process monitoring consists of measuring force and displacement of the punch as joints are being made and checking that the values of these parameters are being correctly maintained by the clinching equipment. Values are obtained using sensors built into the punch and die assembly.
Automated monitoring equipment, in effect, prepares a force versus displacement curve for each clinch joint and compares this with the profile of a satisfactory joint and reports whether the joint formed is within an acceptable range. The width of this acceptance range can be altered to suit the requirements of specific applications. Results outside the acceptance range normally indicate faults (e.g. tool damage) or variations in process operation or materials which could lead to unacceptable joint quality.
Quality control for clinching processes is usually based on visual assessment and measurement of joint features. Force-displacement monitoring of joint quality is mostly used in safety-critical applications.
Further information:
FAQ: What should I check during the visual inspection of clinched joints?
FAQ: For QA purposes, is it possible to monitor the self-piercing riveting process?