穿孔机毛管壁厚精度优化模型开发

Development of Optimization Model for Pierced Shell Wall Thickness Accuracy

由顶头辗轧段与轧辊出口锥段构成穿孔机孔型间隙,该间隙的均匀性对毛管壁厚精度有直接影响。以计算机数值算法为基础,开发了穿孔机壁厚精度优化模型。该模型不仅可精确计算穿孔机孔型间隙,优化顶头辗轧段设计;还可以将实际生产中顶杆弹性变形、顶头前伸量调整等因素考虑在内,通过送进角补偿方法,保证毛管壁厚精度,具有很强的实用性。在实际生产中应用该模型,毛管横截面壁厚精度可控制在±4%以内。

The pass gap of the piercing mill is formed b y the plug rolling section and the roll outlet cone section,and the uniformity of this gap directly affects the wall thickness accuracy of the shell.An optimization model for the wall thickness accuracy of the pierce shell is developed based on the computer numerical computation.With the model not only the piercer pass gap can be computed out precisely,but also the design of the plug rolling section can be optimized.Moreover thanks to the model,based on consideration of relevant elements like the plastic deformation of the plug bar as developed during the actual operation,and the adjustment of the plug lead,etc.,the toe angle compensation method can be adopted to guarantee the shell wall thickness accuracy,which shows the strong practicability of the model.And applying the model to the actual production can keep the cross sectional wall thickness accuracy of the shell with±4%.