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为了提高铝管冲头的使用寿命，用扫描电镜等手段对其失效原因进行深入分析。结果表明冲头在高速冲击过程中温度升高导致回火软化，造成粗大碳化物剥落，剥落的碳化物夹在冲头与铝管之间形成的磨粒磨损进一步加速了冲头的失效进程。用新型冷作模具钢７ Ｃｒ７ Ｍｏ２ Ｖ２ Ｓｉ 代替原 Ｃｒ１２ Ｍｏ Ｖ 钢，并采用优化的淬火、回火工艺处理使冲头寿命提高至原来的４ 倍，再经铁素体氮碳共渗表面强化处理，冲头寿命进一步提高至原来的８ 倍
In order to improve the service life of the aluminum pipe punch, with the means of scanning electron microscopy and other reasons for its failure in-depth analysis. The results show that the high temperature impact of the punch during tempering results in the softening of temper, which causes coarse carbide flaking, and the abrasive wear of the exfoliated carbide sandwiched between the punch and the aluminum tube further accelerates the failure process of the punch. Replacing the original Cr12 Mo V steel with a new cold work die steel, 7 Cr7 Mo2 V2 Si, and using the optimized quenching and tempering process to increase the punch life by four times and then ferritic nitrocarburising surface strengthening Processing, punch life to further enhance the original 8 times