Условия снижения температуры резания при внутреннем шлифовании

Abstract

A theoretical analysis of the possibility of reducing the cutting temperature during internal grinding. It has been established that increasing the length of the arc of contact between the grinding wheel and the workpiece is an important factor in reducing the cutting temperature and, accordingly, improving the quality and productivity of processing. The effect is achieved by increasing the speed of the part. At the same time, the grinding depth can remain constant, whereas in traditional multi-pass grinding schemes, an increase in the speed of a part is associated with a decrease in the grinding depth for a given processing productivity. This shows that by increasing the length of the arc of contact between the grinding wheel and the workpiece, it is possible to simultaneously achieve a decrease in cutting temperature and an increase in processing productivity. A practical implementation of the obtained solution is the proposed method of internal grinding, in which the axis of rotation of the grinding wheel with an individual drive is set perpendicular to the axis of rotation of the machined hole. To reduce the friction intensity in the grinding zone, it is proposed to carry out processing in circles with a soft base, for example, a soft felt (felt) circle with a glued layer of abrasive powder 63C 20P. This circle at the same time allows to reduce surface roughness and cutting temperature, which is of great theoretical and practical importance when finishing holes in pneumatic and hydraulic cylinders. Studies have shown that the application of the proposed method of internal grinding can improve the quality and productivity by reducing the heat stress of the cutting process. It has been established that there are no temperature defects on the treated surfaces.