用多轴自动车床生产六角套帽(连接螺母),既不经济,效率也低,因而产生了改变旧工艺,采用冷挤压工艺的必要性。但是,采用圆柱形毛坯挤压并于随后攻丝的经验表明:挤孔时,六角形毛坯在整个高度方向的充满情况不稳定,它与零件材料的变形程度和冲头形状有关。此外,由于六角体和孔成形过程中金属的流动特点,套帽上端面不平,沿六角的棱 The production of hexagonal caps (connecting nuts) with a multi-axis automatic lathe is neither economical nor efficient, necessitating the need to change old processes and adopt cold extrusion processes. However, the experience with cylindrical blanks and subsequent tapping shows that the hexagonal blanks are not filled to the full height during extrusion, depending on the degree of deformation of the part material and the shape of the punch. In addition, due to the hexagonal and hole forming process of metal flow characteristics, the top surface of the cap uneven, along the hexagonal edge