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.
介绍了两种大断面的空心型材在挤压过程中存在的问题，阐述了改进挤压模具的具体
施和生产时的挤压结果.
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.
介绍了两种大断面的空心型材在挤压过程中存在的问题，阐述了改进挤压模具的具体施和生产时的挤压结果.
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