四切分轧制Ф12mm螺纹钢筋的线差分析及改进措施

Cause Analysis and Elimination Measures of Size Difference of Ф12 mm Rebar from Four-Strand Splitting Rolling

分析了水钢三棒线四切分轧制Ф12 mm螺纹钢筋时成品出现四线差大的原因,其原因包括轧槽加工精度不高,孔型磨损不一致,轧机两侧辊缝不一致,第16架预切轧机(K4孔轧机)或第17架切分轧机(K3孔轧机)的进口未对正轧制线,K4预切分孔型和K3切分孔型设计不合理。通过提高K4和K3孔的加工精度,改进轧辊材质,将K4和K3道次导卫对正轧制中心线,将K4孔型连接带高度由原来的6.0 mm改为6.5 mm,缩小了四切分轧制Ф12 mm螺纹钢筋时的线差。

The causes of serious size difference of Ф12 mm rebar between different strands of fourstrand rolling in No.3 steel rolling line in Shuiagng such as the poor machining accuracy of rolling grooves,the inconsistent wear of grooves,the inconsistent roll-gap on both sides of rolling mills,the entrances of No.16 pre-splitting rolling mill(rolling mill of K4 hole)and No.17 splitting rolling mill(rolling mill of K3 hole)being not aligned with the rolling line,and the unreasonable design of K4 pre-splitting hole and K3 splitting hole are analyzed.The size difference of Ф12mm rebar between different strands of four-strand splitting is reduced by enhancing the machining accuracy of K4 and K3 holes,improving the material of roller,aligning the guides of K4 and K3 holes with the rolling center line,and increasing the height of connection belt of K4 hole from 6.0 mm to 6.5 mm.