探讨在立式水压机上生产大型管材的锻造成型过程，设计相应的工模具，制订生产工艺。
Forging forming process of large pipe produced on vertical hydraulic press was discussed. Relative tools and dies were designed, and production process was drawn up.
LDPE树脂的拉伸强度低，耐压差，刚性差，成型加工时尺寸稳定性差，并且连接困难，不适宜作为给水压力管的材料。
Tensile strength of LDPE resin low voltage differential, rigid poor dimensional stability when processing poor, and connection difficulties, not suitable as a water supply pressure tube material.
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