Abstract
This paper aims to establish an adaptive control principle which can avoid workpiece burn in creep feed grinding, and to evaluate the performance of the actual adaptive control system experimentally. Workpiece burn takes place when grinding energy flux φ (grinding energy per unit contact area per unit time) reaches to a certain limit. Therefore, it is necessary to suppress φ below the limit. For that purpose, it is considered that workpiece speed is controlled adaptively in accordance with the variation of φ, which is due to the deterioration of the grinding wheel working surface during grinding. Based on this principle, an adaptive control system is developed where a micro computer takes inprocess measurements of grinding force and wheel speed, calculates φ, which is compared with a constraint φc, and then assigns a new workpiece speed. Experimental results show that no workpiece burn occurs at all and grinding efficiency is improved by 10-40%.
