圆柱体镦粗过程的应力分布及变化规律

发布时间：2018-03-27 15:47

本文选题：镦粗　切入点：圆柱体　出处：《塑性工程学报》2017年06期

【摘要】：针对圆柱坯料镦粗过程中的应力分布问题,利用主应力法和有限元法进行对比分析,考察坯料不同位置的应力分布及其变化规律、不产生拉应力的极限高径比,以及摩擦系数对极限高径比的影响。研究结果表明,在摩擦条件下,镦粗高径比较大的圆柱体时,坯料端面将产生径向和环向拉应力,且该双向拉应力随着压下量的增加逐渐减小并最终转变为压应力;鼓肚区轴向压应力随着压下量的增加而减小,径向应力接近于0 MPa,环向拉应力随着压下量的增加而增加;当高径比小于0.6时,坯料端面将不产生径向和环向拉应力,且该极限高径比与摩擦系数的关系不大。
[Abstract]:In view of the stress distribution in the process of column blank upsetting, the principal stress method and the finite element method are used to compare and analyze the stress distribution and its variation in different positions of the billet, and the limit height to diameter ratio of tensile stress is not produced. And the effect of friction coefficient on the ratio of ultimate height to diameter. The results show that under friction conditions, radial and circumferential tensile stresses will be produced on the end face of the blank when the cylinder with large upsetting height and diameter is upsetting. The axial compressive stress in the bulging region decreases with the increase of the reduction amount, the radial stress is close to 0 MPa, and the circumferential tensile stress increases with the increase of the reduction amount, and the bidirectional tensile stress decreases gradually with the increase of the reduction amount, and the axial compressive stress decreases with the increase of the reduction amount, and the radial stress is close to 0 MPA. When the ratio of height to diameter is less than 0.6, the end surface of the blank will not produce radial and toroidal tensile stress, and the limit ratio of height to diameter has little relationship with the friction coefficient.
【作者单位】：福州大学机械工程及自动化学院;
【基金】：基金项目福州大学精品课程(2012-05);福州大学本科专业核心课程(2015-50)
【分类号】：TG316.11

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