Study on the Rubbing-Cutting Transition Phenomena with the Gradually Increasing Depth of Cut (3rd Report)

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In this paper, the stresses acted upon the tool edge surtace in the rubbing-cutting transient are analized by the photo-etastic experimental method, in which the lead plates are cut with roundish tool of epoxy resin, and the material flow along that surface is discussed. And, in order to investigate the effects of cutting fluid at the beginning of cut, it is not only to carry out by dry cutting but by wet cutting when using colza oil, carbon tetrachloric or polyflon (D-1) as cutting fluid. The main results are as follows.<BR>At a point of the tool-pilled up material interface, the tangential stress τ is zero and the normal stress σ takes the maximum value. The sign of τ differs at the right and left of this point, and the material flow away to the each other side. Now, it may sately to say that is the separating point. According to the addition of tool-material contact length followed by the tool advance, σ and τ gradually increase and the separating point travels toward the rake surface side. Moreover, about these stress distributions and the position of separating point, there are varied with kind of cutting fluids. Cansequently, it is able to estimate the effects of cutting fluid.
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