摘要
根据蛇形轧制变形区的特点,基于主应力法和优化的屈服准则建立了变形区单位压力解析模型。根据秒流量相等原理和各区分界点处单位压力的连续性,求解中性点位置并判断变形区组成状态。根据边界条件计算积分常数,进而计算蛇形轧制的轧制力和剪切应变引起的弯曲曲率,基于流动准则计算轴向应变引起的弯曲曲率。结合由剪切应变和轴向应变引起的弯曲曲率得到蛇形轧制总弯曲曲率。在弯曲曲率模型中引入均匀系数E’对近似值进行修正。选取几组算例对计算结果和有限元结果进行对比,结果表明,轧制力和曲率的理论计算结果与有限元结果吻合良好,在预测轧制力和曲率方面具有一定的准确性。
According to the characteristics of snake rolling deformation zone,the analytical model of unit pressure was established based on the principle stress method and the optimized yield criterion. According to the principle of equal flow per second and the continuity of unit pressure at the boundary point of each zone,the position of neutral point and composition state of deformation zone were solved. The integral constant was calculated according to the boundary condition,and then the rolling force of snake rolling and the bending curvature caused by shear strain were calculated. The bending curvature caused by axial strain was calculated based on the flow criterion. The total bending curvature of snake rolling was obtained combining the bending curvature caused by shear strain and axial strain. The uniformity coefficient E’ was introduced into the bending curvature model to modify the approximate value. Several groups of examples were selected to compare the calculation results with the finite element results. The results show that theoretical calculation results of rolling force and curvature are in good agreement with the finite element results,which has a certain accuracy in predicting the rolling force and curvature.
作者
江连运
甄涛
黄金博
卫垚宇
JIANG Lian-yun;ZHEN Tao;HUANG Jin-bo;WEI Yao-yu(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第5期249-256,共8页
Journal of Plasticity Engineering
基金
国家自然科学基金青年基金资助项目(51804206)
山西省科技重大专项(20181102016)。
关键词
蛇形轧制
轧制力
弯曲曲率
中性点
snake rolling
rolling force
bending curvature
neutral point
