直缝焊管机组定径平辊底径递增量的探讨

A Cursory Review Concerning Bottom Diameter Progressive Increment of Flat Sizing Roll of Straight Weld Pipe Mill

根据定径原理 ,提出直缝焊管机组定径平辊底径递增量Δd是焊管外径Dn 、管壁厚度S、定径余量ΔD、管材弹性ε的函数 ;并且从定径余量转换成焊管纵向增长量以及定径过程需要焊管保持一定张力的角度对定径平辊底径递增量进行推导 ,得到定径平辊底径递增量的计算式 ,为科学合理设计定径平辊底径递增量提供了理论依据 ,对延长轧辊使用寿命、提高焊管表面质量。

Based on the principle of sizing,it is pointed out that the flat sizing roll bottom diameter progressive increment,Δd is a function of Dn —pipe O.D.,S —pipe W.T.,ΔD —sizing allowance and ε—tubular elasticity.Deduction of the flat sizing roll bottom diameter progressive increment is carried out on the basis of conversion of the sizing allowance into longitudinal increment of the pipe and of the fact that during sizing,the pipe has to be maintained with a specific stretch,and thus computing formula of the said progressive increment is established,which can be used as theoretic basis for proper design of the said progressive increment,meaning so much to prolonging the roll service span,improving pipe surface quality as well bettering the roll generality.