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This paper presents strategies for an automated control of distortion at the operational level of a production process chain, as well as first steps towards a combined implementation in heat-treatment processes. In order to minimise the loss of production due to quality defects, the first quality control loop will be implemented on an inprocess level. The second control loop within the reach of operational control includes the feedback of post-process measurements of quality features. As such, the post-process control loop optimises the set-values of the in-process control loop.

In the SFB570, several sub-processes of the standard process chain for manufacturing bearing rings have been modified in order to compensate distortion. This paper presents control strategies that enable a precise deployment of the compensation potential, on a local (sub-process) level as well as along the process chain. Two different control strategies for local compensation are demonstrated at the example of the cutting and the gas quenching processes. Furthermore, a concept for a process-wide compensation of distortion is presented.Key words: Quality control, compensation, bearing ring, roundness, wall thickness Im SFB 570 wurden mehrere Teilprozesse der Standard-Prozesskette eines Wälzlagerrings für eine Verzugskompensation modifiziert. Dieses Paper präsentiert Regelungsstrategien, die eine gezielte Auslösung des Kompensationspotenzials auf einer lokalen (Teilprozess-) Ebene sowie entlang der gesamten Prozesskette ermög-lichen. Zwei verschiedene Regelungsstrategien für eine lokale Verzugskompensation werden am Beispiel des Zerspan-und Gasabschreckprozesses demonstriert. Darüber hinaus wird ein Konzept für eine prozessübergreifende Verzugskompensation vorgestellt.

During the turning process of a ring, the clamping force of the chuck causes circumferential deviations in the ring wall thickness and diameter. In order to minimise the wall thickness deviations, an experimental set-up for an inprocess control of the cutting depth during turning is being developed. The set-up comprises a Fast Tool unit, an ultrasonic measurement system and a global control unit. In preliminary tests, the ultrasonic measurement proved suitable to acquire the changes in wall thickness. First turning experiments show that the developed Fast Tool unit and the applied control strategy fulfil the requirements for an in-process compensation of wall thickness deviations during standard turning conditions.