下切式平行刃剪切机剪切机理研究及力能参数分析

发布时间：2018-04-12 08:43

本文选题：下切式 + 平行刃　；参考：《辽宁科技大学》2017年硕士论文

【摘要】：剪切机是一种将轧件剪切成为一定长度钢坯的设备,同时剪去轧件的头尾两部分。提高剪切机剪切效率以及降低能耗是目前轧钢生产的首要目标,要实现这个目标就需要对钢坯件在受剪过程中的变形机理有充分的了解,提高钢坯件断口质量以及对剪切条件进行优化。课题研究以某轧钢厂下切式平行刃剪切机为研究对象,首先利用UG软件对在剪切过程中的钢坯件受剪切过程进行了弹塑性大变形三维有限元仿真模拟,分析了钢坯件在受剪切过程中弹塑性变形的形成规律、应力发展规律以及剪刃表面力的分布规律。通过分析下切式平行刃剪切机的影响因素,得出七大影响因素,运用权数分析法对影响因素进行重要性排序,给出了基于剪切间隙、剪切角度及切入深度三大影响因素下的剪切力优化算法。其次针对下切式平行刃剪切机对钢坯件的运动过程进行建模和有限元模拟,模拟结果表明,钢坯件在受剪过程中,与下剪刃接触有较大范围变形,下剪刃与钢坯件接触应力集中要大于上剪刃,应力集中的最大区域在间隙附近,上、下剪刃尖端出现较高应力集中点。此剪切过程在应力比较集中的上下剪刃处首先出现屈服变形,模拟结果与实际过程比较吻合。最后利用静力学有限元对下切式剪切机的力学性能进行建模优化,通过不断的改变降低施加下切式平行刃剪切机的荷载,划分一定的有效单元格,在满足基本性能的基础上,通过对剪切机整体降低其受力,来实现下切式平行刃剪切机的市场输出率。本课题的研究对下切式平行刃剪切机的性能分析具有一定的理论指导意义,为提高剪切机的生产效率提供重要依据。
[Abstract]:The shearing machine is a kind of equipment to cut the workpiece into a certain length billet and to cut off the head and tail parts of the workpiece at the same time.To improve shear efficiency and reduce energy consumption is the primary goal of steel rolling production. In order to achieve this goal, it is necessary to fully understand the deformation mechanism of billet parts in the process of shear.Improve the fracture quality of billet and optimize the shear condition.In this paper, taking the down-cut parallel edge shearing machine in a rolling mill as the research object, firstly, using UG software to simulate the shear process of billet parts in the process of shear with elastic-plastic large deformation three-dimensional finite element simulation.The forming law of elastic-plastic deformation, the law of stress development and the distribution law of shear edge surface force are analyzed in this paper.Through the analysis of the influence factors of the down-cut parallel cutting machine, seven major influencing factors are obtained, and the importance of the influencing factors is ranked by using the weight analysis method, and the shearing gap is given.The optimization algorithm of shear force under three factors of shear angle and cutting depth.Secondly, the motion process of the billet is modeled and simulated by finite element method. The simulation results show that the billet is in contact with the shearing edge in a large range during the shear process.The contact stress concentration between the lower shear edge and the billet is greater than that of the upper shear edge, and the maximum stress concentration is near the gap, and a higher stress concentration point appears at the top of the lower shear edge.The shear process first appears yield deformation at the upper and lower shear edges where the stress is concentrated. The simulation results are in good agreement with the actual process.Finally, the static finite element method is used to model and optimize the mechanical performance of the shearing machine. The load of the down-cut parallel edge shearing machine is reduced by changing continuously, and the effective cells are divided into certain effective cells on the basis of satisfying the basic performance.The market output rate of the down-cut parallel cutting machine is realized by reducing the force on the shearing machine as a whole.The research of this subject has a certain theoretical significance for the performance analysis of the down-cut parallel cutting machine, and provides an important basis for improving the production efficiency of the shearing machine.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG333.21

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