Control device and method for setting upper and lower limit curves for one or more tools configured to attach fasteners.

Abstract

A controller for one or more tools configured to set fasteners in a production process is provided, the controller obtaining a set of trace data (15) relating to a plurality of test fastener setting operations performed by at least one of the one or more tools in a production setup process, and determining from the set of trace data a maximum and minimum value indicative of setting force (T) for each of a plurality of values ​​indicative of displacement or time (α). max , T min ) or its derivative, calculates first and second polynomials based thereon, and sets upper and lower limit curves (11, 12) based on the first and second polynomials. Then, in the production process, the control device determines that the fastener installation operation is not acceptable (NOK) if the trace data (16) exceeds the upper and lower limit curves. This provides a balanced trade-off between the leniency / strictness of the limit values ​​and improves the detection accuracy of NOK operations.