公开(公告)号：US20160346820A1

公开(公告)日：2016-12-01

申请号：US14917371

申请日：2014-12-12

Applicant: SANMINA CORPORATION

Inventor： Winfried Braun ,  Christian Klempel ,  Rene Baadjou ,  Rolf Kümmerling

IPC: B21B25/00

CPC classification number: B21B25/00

Abstract: A piercing mandrel for piercing heated round blocks of metal for the production of seamless pipes, having a piercing mandrel nose and a piercing mandrel main body which can be connected to a mandrel bar. The outer diameter of the piercing mandrel nose is formed in a conically tapering manner in the longitudinal direction towards the piercing mandrel main body in order to increase the durability of the piercing mandrel when used for piercing round blocks of metal, in particular higher-alloyed steel materials which are difficult to work, by means of skew rolling providing a qualitative improvement of the inner surface of the pierced round block and reducing tool costs.

Abstract translation: 一种用于刺穿加热的金属圆块的穿孔心轴，用于生产无缝管，具有穿刺心轴鼻和可连接到芯棒的穿刺心轴主体。 穿刺心轴鼻部的外径在朝向穿孔心轴主体的纵向方向上以锥形锥形形成，以便在用于刺穿圆形金属块，特别是较高合金钢的时候增加穿孔心轴的耐久性 通过倾斜轧制难以加工的材料提供穿孔圆块的内表面的定性改进并降低工具成本。