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顶头形状设计是压力穿孔机理论研究的重要内容．减少穿孔力是相对提高穿孔机顶杆刚度．改善毛管偏心度的重要途径．根据压力穿孔过程中金属的变形特点．将变形区分成预穿孔区和穿孔延伸区．利用上限元法以最小穿孔力为目标．在穿孔延伸区中对顶头形状和变形锥长度进行了优化．确定了Ｋｏ的选取原则．中间实验验证了理论分析的正确性．
Head shape design is an important part of the theory of pressure piercing machine. Reduce the perforation force is relatively improve piercing machine jack stiffness. An important way to improve the capillary eccentricity. According to the deformation process of metal deformation during puncturing. The deformation is divided into a pre-perforated area and a perforated extension area. Using the upper bound element method to the minimum piercing force as the goal. The shape of the plug and the length of the deformation cone are optimized in the perforated extension. Determine the selection principle of Ko. The experimental results verify the correctness of the theoretical analysis.