锻压技术

小断面收缩率轴类件楔横轧过程的数值分析

英文标题：Numerical analysis of cross wedge rolling process for small cross-sectional shrinkage shaft

作者：孙光辉辛选荣陈学文

单位：河南科技大学

关键词：楔横轧椭圆化金属流动凹心

分类号：TG335

出版年,卷(期):页码：2016,41(2):68-72

摘要：

使用Deform软件，对楔横轧小断面收缩率轴类件进行模拟分析，得到了小断面收缩率轴类件的应力-应变规律。模拟结果显示：楔横轧小断面收缩率轴类件的主要成形发生在展宽段，在轧件与模具接触的区域，轧件的三向应力均为压应力，且压应力的值较大，在轧件的中心区域，横向应力为拉应力，其值达到25 MPa左右，轴向应力为拉应力，其值达到35 MPa左右，轧件易产生缩松、裂纹等缺陷；小断面收缩率轴类件的对称横截面出现椭圆化，椭圆度值可达到2.28%；对楔横轧小断面率轧件进行金属流动性分析，发现轧件的变形主要发生在轧件的外层附近，在不同的横截面上，截面离对称横截面越远，轴向位移的值越大；在轧件的端面上选取P1，P2，P3，P4这4点，轧件的外层P4处轴向位移大，轧件的心部P1处轴向位移小，导致轧件出现了凹心现象。

The cross wedge rolling process of small cross-sectional shrinkage shaft was simulated by software Deform, and the regulation of stress-strain was obtained. The result indicates that the main forming of the small cross-sectional shrinkage shaft occurs on the stretching section. The triaxial stress of the workpiece is compressive stress in contact with the die area, and the compressive stress value is large. However, the transversal stress of the workpiece is tensile stress in the central region of the workpiece, and its value is about 25 MPa. Furthermore, the axial stress is tensile stress and its value is about 35 MPa, and it is easy to produce shrinkage and cracks. Then, the ellipse appears in the small cross-sectional shrinkage shaft, and its ellipticity is up to 2.28%. The deformation of shafts is found to produce mainly around the outer of shafts by the metal flow analysis. In different cross-sections, the farther distance is the cross section from the symmetric cross section, the greater is the axial displacement. P1,P2,P3,P4 are selected in the end face of the workpiece, P4 axial displacement at the outer layer of the workpiece is large and P1 axial displacement at the heart of workpiece is small, which cause concave core in the workpiece easily.

基金项目：

国家自然科学基金资助项目（51575162）

孙光辉（1989-），男，硕士研究生

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