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
过程中存的问题，阐述了改进模具的具体
施和生产时的结果.
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过程中存的问题，阐述了改进模具的具体施和生产时的结果.
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