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利用上限元（ＵＢＥＴ）模拟了圆柱直齿轮径向挤压过程金属的流动行为，分析了模具参数和工艺参数对金属流动的影响。
The upper bound element (UBET) was used to simulate the flow behavior of the metal in the radial extrusion process of cylindrical spur gear. The influence of the die parameters and process parameters on the metal flow was analyzed.