Abstract
The machining of grinding wheel is an important research problem related to wheel finishing process. This subject is also a typical example of ceramic composite material machining. However, there is insufficient information about this type of cutting. In this study, a turning experiment was performed on white alumina grinding wheels by the use of cemented carbide, sintered CBN and sintered diamond single point cutting tools. The cutting speed ranged from 0.003 to 150 m/min, the maximum depth of cut was 1.0 mm, and the feed was 0.6 mm/rev. Thus, the tool wear and cutting force were measured for various cutting conditions, and the optimum operating condition and mechanism of chip formation were obtained. The effects of cutting speed, rake angle, and nose radius were specially investigated. The cutting mechanism was also studied from a specially low speed orthogonal cutting experiment and FFT analysis. It is evident from this study that grinding wheel can be cut easily by using a proper cutting tool, such as K01 and sintered diamond tool, and by selecting relatively low cutting speeds, great negative rake angle and large nose radius. The chip is mainly formed by compressive fracture.
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