Φ89mm連軋管機組張力減徑機成品孔型的改進設(shè)計

Design for Improvement of Finished Tube Pass for Stretch Reducing Mill of Φ89 mm MPM Plant

摘要: 針對張力減徑機成品孔型傳統(tǒng)設(shè)計方法的不足,提出了新的孔型設(shè)計方法,即成品孔型采用橢圓形(而不是圓形),孔型橢圓度大于1(1.007~1.010),孔型的短半軸與成品前一孔型的短半軸相等;成品前一個孔型采用橢圓形,適當(dāng)減小橢圓度。實踐證明,新的成品孔型設(shè)計方法能有效地控制鋼管外徑的橢圓度,提高鋼管外徑精度,使成品孔型的使用壽命增加1/3,并且減少了成品管青線缺陷的產(chǎn)生。

Abstract: Addressing the shortcomings of the conventional design method for the finished tube pass of the stretch reducing mill,a new design method is proposed. The method involves an oval pass for finished tube-rolling instead of the original round one. The pass ovality is bigger than 1 (1.007 ~ 1.010),and the short semi-axis is equal to that of the pass just before the finished tube pass. The pass before the finished tube pass is also oval,but the ovality is properly reduced. Relevant operation practice shows that thanks to this new design method,outside diameter ovality of the pipe can be effectively controlled so as to tighten the O.D. tolerance,increase the life span of the finished tube pass by 1/3,and minimize the occurrence of linear rolling mark of the finished tube.