【摘要】 采用方形游动芯头配以相应方形外模衬拉，生产外方内方紫铜长管的新工艺（拉伸过程中方形游动芯头在管材内自行受力平衡），及其模具设计中几何参数的确定。更多还原

【Abstract】 A new Process using square shaped floating plug together with Square shaped drawing mold is adopted forproducing great length square copper tube with square hole. The parameters for making the toolings are given. It is foundout that the force exercised on the plug during drawingprocess is well balanced.更多还原