The problems existed in extrusion process of two sorts large section hollow extrusion profilesare introduced. The concrete measure and extrusion consequence of the improved prothole die are given.
介绍了两种大断面
空心型材在挤压过程中存在问题，阐述了改进挤压
体
施和
挤压结果.
The problems existed in extrusion process of two sorts large section hollow extrusion profilesare introduced. The concrete measure and extrusion consequence of the improved prothole die are given.
介绍了两种大断面空心型材在挤压过程中存在问题，阐述了改进挤压体施和挤压结果.
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