The wear of piercingpunch is one of main die lose efficacy.
冲孔凸模磨损是模具失效的主要形式之一。
2
The test of sulphurized tufftride process for treating the hot piercingpunch for steel pipes is introduced.
介绍了钢管热冲孔凸模硫氮碳共渗工艺试验。
3
This paper analyzes main reason why thick sheet piercingpunch is easily destroyed, and design a new punch to above-mentioned problem and introduces its some characters.