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Abstract：
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Based on building the 3-D elasto-plastic FEA model on the internal gear of the speed reducer and its mould,the process of cold extrusion of the internal gear workpiece was simulated by the 3-D elasto-plastic FEA method,and the accurate distribution of forging stress was got.The results of stress distribution were analyzed,and the part of the stress concentratoin was obtained.A method of reducing the concentration of stress was found.The results of simulation make good agreement to the practice,and the serve life of the mold is prolonged obviously.This research plays a guiding role on the simulation of the cold extrusion, controlling of the technical parameter and improvement on the life of the module.
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