Development of Theoretical Approach to Determination of Cutting Temperature During Grinding and Conditions of Its Reduction

Abstract

The paper develops a theoretical approach to determining the cutting temperature during grinding and the conditions for its decrease, taking into account the balance of heat leaving the chips and the workpiece. It has been established that with an increase in the contact time of the wheel with the material being processed, the cutting temperature continuously increases, asymptotically approaching the maximum cutting temperature, which is determined by the ratio of the conditional cutting stress to the specific heat capacity and density of the material being processed. Based on this, it is proposed to consider the maximum cutting temperature as a new universal technological processing parameter that determines its potential and allows comparing various machining methods according to the temperature criterion and choosing the most effective of them. On this basis, the main direction of reducing the cutting temperature and improving the quality and productivity of processing is substantiated, which consists in reducing the maximum cutting temperature to the level and below the melting temperature of the material being processed. This makes it possible to carry out grinding with a significant machining capacity with virtually no increase in cutting temperature. It is shown that the main condition for reducing the maximum cutting temperature is to reduce the conditional cutting stress.