消除穿孔毛管尾端鐵耳子方法的探討

Approach to Preventing Tail-end Fins of Pierced Shell

摘要: 管坯穿孔時由于內(nèi)外層金屬變形不均勻, 致使毛管尾端產(chǎn)生鐵耳子, 并在連軋工序易帶入鋼管內(nèi)部, 劃傷芯棒表面和鋼管內(nèi)表面, 鐵耳子掉在機架間又會卡軋輥。通過優(yōu)化設(shè)計穿孔工具 (導(dǎo)板和頂頭) 以及調(diào)整軋制參數(shù)后, 基本消除了鐵耳子, 改善了鋼管質(zhì)量, 提高了芯棒、軋輥的使用壽命。

Abstract: Tail-end fins are normally produced with the pierced shell due to the fact that deformations of the outer layer metal and that of the inner layer are not consistent to each other.Such fins would very possibly get into the pipe to scratch the mandrel surface and the internal surface of the pipe during the MPM rolling process.Moreover, if the fins fall down between the mill stands, the rolls would be jammed.But now, such troublesome fins have been almost prevented by means of optimizing the piercing tools (the guide shoes and the plug), and adjusting the rolling parameters, resulting in improvement on pipe quality, and enhancement of services spans of both the mandrel and the roll.