Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Experimental Study of Piercing Characteristics and Wear of Plugs in Press Roll Piercer of Seamless Pipe
Akira OHNUKIYoshiki SHIBATAShori NODAKoe NAKAJIMA
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1984 Volume 70 Issue 2 Pages 224-231

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Abstract

Plug life of PRP (Press Roll Piercer) process, in which a square bloom is directly pierced and rolled simultaneously, is strongly affected by its own shape. A plug with a sharp conical top thrusts through the solid material to get galled in the earlier stage by metal flow on its surface. On the other hand, a plug with dull top or a flat top has a longer life, since it is protected by dead metal induced in front.
As for plug material, conventional tool steel for hot metal forming is durable enough, only if surface scale layer is formed before use. The product quality is also influenced by plug shape. Especially dull one is advantageous.

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© The Iron and Steel Institute of Japan
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