Study on Effect of Cutting Fluid (4th report) : Cutting Ability Test of High Speed Steel by Facing Cut

In the 3rd report, it is described that the estimation of cutting fluids by the facing cut is done more resonably in the separate range of low and high cutting speed than the ordinary continuous facing cut. Because, the main causes of tool failure are quite different in each cutting speed range. The ordinary facing cut starts from the very small inside diameter (very low speed) and results in the complete failure at the large diameter (very high speed). Such an ordinary facing test is apt to be only a testing method of a complete failure due to the thermal effect and it is impossible to estimate properly the character of cutting fluids. In this report, the tool failures at the ordinary facing cut are observed in each cutting time, and then N-D curves of several kinds of tool materials are obtained for 2 kinds of cutting fluid. The test results show that the ordinary facing cut test due to the complete failure is to estimate only the ability against thermal wear and softening. Therefore, only the cooling ability of cutting fluid is more pronounced. The above description is justified at the estimation of cutting ability of high speed steel tool material. That is, the cutting ability is more reasonably and quickly estimated by applying the facing cut of the two separate ranges of cutting speed for mechanical wear and thermal wear resistance respectively. Furthermore, it is shown that the cutting fluid reduces the cutting temperature, cutting force and prolonges the appearance of complete failure. But mechanical wear increases.

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