50MN水压机大型分流组合模的改进

Improvement on the Large Prothole Die of 50 MN Extrusion Press

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措施和生产时的挤压结果．

The problems existed in extrusion process of two sorts large section hollow extrusion profiles are introdued. The concrete measure and extrusion consequence of the improved prothole die are given.