METHOD TO DETERMINE A QUALITY ACCEPTANCE CRITERION USING FORCE SIGNATURES

摘要

A method is provided to determine a quality acceptance criterion using force signatures measured on a first and a second set of elements. The first set has no quality defect and the second set has a deliberate quality defect. Selection of an initial subset of time points is based on statistical analysis of the force data on the force signatures in the two sets. The quality acceptance criterion includes a quality threshold established using Mahalanobis Distance (MD) values and the MD values are produced from force data at a selected initial subset of time points for each element in the two sets. An output of the determined quality acceptance criterion is using the defined quality threshold to separate an element having a force signature into a group of elements having no quality defect or into a group of elements having a quality defect like the deliberate quality defect.