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分别采用了主应力法、功平衡法以及上限法推导了大口径厚壁无缝钢管在挤压过程中挤压力的3种计算公式,并且利用有限元模拟法对大口径厚壁无缝钢管挤压力进行了模拟计算。与有限元计算相比较,主应力法和上限法计算结果的平均相对误差分别仅为7.70%和7.61%,表明这两种公式具有一定的工程适用性;功平衡法计算结果的平均相对误差较大,但若取理论计算结果除以120%后的值,再与模拟结果作比较,则平均相对误差可降至3.18%,仍可精确预测大口径厚壁无缝钢管挤压力。
Principal stress method, work balance method and upper bound method are respectively used to derive three kinds of formulas for squeezing pressure of large diameter thick-walled seamless steel pipe in the process of extrusion. The finite element method is used to simulate the large-diameter thick-walled seamless steel pipe Extruding pressure was simulated. Compared with the finite element method, the average relative errors of the principal stress method and the upper method method are only 7.70% and 7.61%, respectively, indicating that the two formulas have some engineering applicability. The average relative error of the results of the work balance method However, if the theoretical calculation result is divided by 120% and compared with the simulation result, the average relative error can be reduced to 3.18%, and the extrusion pressure of the large-diameter thick-walled seamless steel pipe can be accurately predicted.