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为研究不同轧辊转速、送进角、轧辊入口锥角等工艺参数对大口径厚壁P92钢管二辊斜轧延伸过程分层缺陷形成倾向性的影响,借助于商用有限元软件MSC.SuperForm,对不同工艺条件下大口径厚壁P92钢管二辊斜轧延伸过程进行了三维热力耦合模拟;采用Oyane韧性断裂准则分析了轧件损伤场及钢管分层缺陷的倾向性。研究结果表明:钢管内表邻近顶头接触区存在破裂高危带,轧件最大损伤特征值随轧辊转速的降低、送进角和轧辊入口锥角的增大而减小,发生分层缺陷的倾向性降低。此研究为揭示钢管分层缺陷形成机制,确定缺陷发生的敏感工况,制定防止或减轻分层缺陷的有效措施提供科学依据。
In order to study the influence of processing parameters such as different roll speed, feed angle and roll entrance taper angle on the formation of delamination defects during the two-roll oblique rolling process of large diameter thick-walled P92 steel tube, with the aid of commercial finite element software MSC.SuperForm Three-dimensional thermal coupling simulation was carried out on the two-roll oblique rolling process of large-diameter thick-walled P92 steel tube under different technological conditions. The tendency of the damage field and the delamination of the steel tube was analyzed by Oyane ductile fracture criterion. The results show that there is a high-risk zone of rupture in the contact area near the inner surface of the steel tube. The maximum damage characteristic value of the rolling element decreases with the decrease of the roll speed, decreases with the increase of the feed angle and the entrance taper angle of the roll, reduce. This study provides a scientific basis for revealing the formation mechanism of delamination defects in steel pipe, determining the sensitive working conditions of defects and formulating effective measures to prevent or reduce delamination defects.