内置软管可以有效改善管材的内表面质量，并显著减小冲头推力。
The quality of the internal surface can be greatly improved and the punch force can be significantly reduced by using inner set hose.
本实用新型的目的是设计一种扩管效率高且质量好的异型扩管冲头。
The aim of the utility model is to design a special-shaped pipe expanding plunger chip with high pipe expanding efficiency and good quality.
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