ENERGY FLOWING RATE INTO WORKPIECE IN SURFACE GRINDING BASED ON 3-DIMENSIONAL TEMPERATURE ANALYSIS (1ST REPORT) - DISCUSSION ON TEMPERATUREDISTRIBUTION IN WORKPIECE MEASURED BY HOLE METHOD

In order to determine the energy flowing rate into a workpiece in surf ace grinding, the temperature in the workpiece was measured by the the rmocouple insertion method, in which a fine constantan wire was insert ed and welded in a small hole, and the temperature around the hole was numerically analyzed using three-dimensional heat transfer equation b y control volume method. Through the analysis the effects of temperatu re measuring methods, such as the size of fine hole and the existence of constantan wire, on the measured temperature were discussed in deta il. The temperature around the bottom of the hole, the measured point, becomes 2 or 3 times higher than that without the hole, especially at near the ground surface. The energy flowing rate into the workpiece w as preliminarily estimated using the results by three-dimensional temp erature analysis and the measured temperature with the thermocouple in sertion method. The estimated rate is 30-40% of the total grinding ene rgy and the rate is about a half one which is obtained based on the te mperature neglecting the disturbance by a measuring hole and a:constan tan wire.