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一、引言园孔型长芯棒轧管时,芯棒上单位压力的分布是芯棒轧管理论的一个基本问题。通过对芯棒上单位压力分布的研究,分析芯棒轧管变形区的特点,明了长芯棒磨损不均以致报废的本质原因,由此方能制定合理的工艺制度,确定提高芯棒使用寿命的措施。 Hoffman、Sachs、Целиков对芯棒上单位压力分布进行了理论研究,他们在变形区中取微分单元体列Karman方程时,简化假设芯棒上的单位压力P_2等于轧辊上的单位压力P_1。但实际上,由于金属与轧辊以
I. INTRODUCTION The distribution of the unit pressure on the core rod is a basic problem of the mandrel rod rolling theory when the round hole type long core rod rolling tube is used. Through the study of the unit pressure distribution on the mandrel and the analysis of the characteristics of the deformed area of the mandrel rolling tube, the essential causes of the uneven wear of the long mandrel are found out so as to formulate a reasonable process system and determine the service life of the mandrel The measure. Hoffman, Sachs, and Целиков have done a theoretical study of the unit pressure distribution on the mandrel. When they take the Karman’s equation of the differential element in the deformation zone, simplifying the assumption that the unit pressure P 2 on the mandrel is equal to the unit pressure P_1 on the roll. But in fact, due to the metal and the roller