異方性材料の切削機構に関する研究

Abstract

Aluminium plates which have various inclination to rolling direction are cut orthogonally, and the cutting force and the shear angle are measured. Moreover, the anisotropic parameters and the γ-value are determined from tensile test of the same plates. Then, the effects of anisotropic nature on the chip formation are discussed from these results.The main results are as follows.(1) The cutting force R changes periodically against the plate inclined angle to rolling direction θ, and takes the minimum value near θ=0°, 90°, 180° and the maximum value at a middle of these. On the other hands, the shear angle φ changes in the reverse phase of R, and the ratio of its variation width to the mean value comes up to 50%.(2) The slope angle of R to cutting velocity (β-α) is almost invariable for θ. Accordingly, the main factor bringing a large periodical change of R consists in the variation of φ.(3) These phenomena can not be explained with the theory of plane strain, because of a different aspects of aluminium plate in relation between γ-value and 0 from, for example, steel or copper plate.(4) The φ (β-α) relationship is almost ploted on a straight line distinguished only by θ, and is out of the solution by Merchant or Lee-Shaffer.