论文部分内容阅读
大口径厚壁无缝钢管是关系我国能源安全的重要产品。在斜轧穿孔过程中,由于轧辊和顶头的挤压及摩擦作用,其金属内部的变形程度和速度都极为复杂。在复合变形的条件下,孔隙性缺陷的焊合极为困难。文章通过圆柱形试样压缩实验,深入研究金属材料的孔隙性缺陷在复杂应力应变情况下的变化与发展规律,确定了复杂应力应变条件下孔隙性缺陷的消除判据;通过理论分析和数值模拟,研究大口径厚壁无缝钢管斜轧穿孔过程中的变形机理,得到影响无缝钢管中孔隙性缺陷焊合的因素及规律;建立了以消除大口径厚壁无缝钢管的孔隙性缺陷为目标的斜轧穿孔参数的制定原则和方法。
Large-caliber thick-walled seamless steel pipe is an important product of China’s energy security. In the process of cross-piercing perforation, due to the squeezing and friction of the roll and the head, the degree of deformation and speed of the metal inside are extremely complicated. In the composite deformation conditions, the welding of porous defects is extremely difficult. In this paper, through the cylindrical compression test, the variation and development of porosity defects in metal materials under complex stress and strain conditions are deeply studied, and the elimination criterion of porous defects under complex stress and strain conditions is determined. By theoretical analysis and numerical simulation , To study the deformation mechanism of large-diameter thick-walled seamless steel pipe during the process of cross-rolling and to obtain the factors and rules that affect the welding of the void defects in the seamless steel pipe. To establish the method to eliminate the porosity defects of the large- Objectives of the development of the parameters and the development of the rolling principle and method.