Abstract
The process utilizing divided material flow is applied to working a ring gear. When the specimen is of a larger height and the ratio of the height to the radial thickness is large, the central material flow in the radial direction produces a time lag in both the upper and a lower material flow which causes a product defect. The theoretical calculation suggests that the above phenomenon can be eliminated when the side shppe of a specimen is swollen at the central portion. Various experiments are carried out based on the above estimate. The experiment makes clear that it is useful to swell the side shape. When the side shape is that of a beer-barrel with a small radius of curvature, the working pressure is reduced. A ring gear of high accuracy can be forged under the mean pressure of about 2.6 times the final uni-axial compressive yield stress of the worked material.
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