PCR加工における拡管の影響

概要

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A new process for tube ironing, the "planetary conical rolling" (PCR) process, is proposed. A number of rollers rotate around the cone while revolving around their respective axes, preventing sliding friction which is the main cause of galling and breakage in the conventional ironing process. In the case of marked thinning, bulging occurs at the inlet, producing an unsteady process. In this study, PCR forming is improved by suppressing bulging during radial expansion. Keeping the reduction constant, R=0.42, the radial expansion ratio E was varied as 0.025 and 0.049. Two motions, forward and backward, of the tube and die, were tested. The deformation characteristics were discussed based on the strain measurements and stress conditions on the equilibrium equation. From the discussions it was clarified that bulging is suppressed by the bending tensile stress and circumferential extension. Furthermore, the optimum conditions for suppressing bulging and the mechanism of producing a mirror finish were discussed.
社団法人日本機械学会の論文
1996-09-25