PIERCING MANDREL HAVING AN IMPROVED SERVICE LIFE FOR PRODUCING SEAMLESS TUBES

摘要

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.

主权项

1. Piercing mandrel for piercing heated round blocks of metal for the production of seamless pipes, the piercing mandrel comprising a piercing mandrel nose and a piercing mandrel main body which can be connected to a mandrel bar, wherein the outer diameter of the piercing mandrel nose is formed in a conically tapering manner in the longitudinal extension towards the piercing mandrel main body.