鋼管頭尾增厚端壁厚分析及數(shù)學模型建立

Analysis of Wall Thickness Distribution in Tube Head/Tail End Thickened Sections and Establishment of Relevant Mathematical Models

摘要: 通過對鋼管頭、尾增厚端壁厚進行測量,對其分布形態(tài)進行回歸分析,模擬出了頭、尾增厚端壁厚變化規(guī)律的線性和非線性數(shù)學模型,并對二者的擬合精度進行比較。比較后發(fā)現(xiàn),以減徑率、平均張力系數(shù)作為線性模型的主要影響因素時,增壁率的擬合精度高,增厚端長度的擬合精度較差;但采用非線性模型進行擬合時,增厚端壁厚和長度的擬合精度都非常高。這為實際生產中切頭、尾長度的預報提供了理論依據(jù)。

Abstract: Based on the measurement of the wall thickness of the tube head/tail end thickened sections,and the regression analysis of the thickness distribution pattern,simulation linear and non-linear mathematical models of the variation rules for the said tube-end thickening phenomenon are set up,and the fit accuracies of them are compared.The result of the comparison shows that with the diameter-reduction rate and the average stretch factor as the key influencing elements for the linear model,the fit accuracy of the wall thickness increase rate is rather high,but that of the thickened section length is rather poor.However,in case of fitting with the nonlinear model,fit accuracies of both the wall thickness and length of the tube-end thickened section are considerably high.This conclusion is worthy using as a theoretic basis for proper control of tube cropping operation.