Development of a Single-grit Grinding Test Apparatus

Studies on Performance of Cutting Points of a Grinding Wheel (3rd Report)

Abstract

The paper describes the development and trial product of a single-grit grinding test apparatus. The basic apparatus consists of a horizontal surface grinder and a system for controlling the grinding force by manipulating the infeed. A micro-computer is applied for the control and processing of data. Another important feature of the apparatus is that a high-frequency piezoelectric dynamometer is mounted on a rotary wheel, on the periphery of which a grit to be tested is fastened. The dynamometer output signal is fed via a slip ring to the micro-computer. These lead to a remarkable reduction of trouble and time required for testing, and consequently enable to increase the number of samples. A series of single-grit grinding tests have been carried out on the combination of Cr-Mo steel and WA grit at various reference values of grind-ing force using the apparatus. Each several test is made on 20 samples. Fluctuation of grinding force is maintained within about 20% of the desired value. Wear rate has a considerable variation from grit to grit. The mean rate of wear is proportional to the grinding force exerted on grit.