旋压成形旋轮工作状态数值模拟及实验研究

发布时间：2018-04-03 14:28

本文选题：旋压成形　切入点：旋轮　出处：《山东科技大学》2017年硕士论文

【摘要】：旋压是一种先进的塑性加工成形技术,广泛应用于航空航天、军工生产、机械工程以及日用品生产等行业中,具有变形力小、节约原材料、制品强度高等优点。近年来,国内许多学者对旋压技术进行了研究,主要集中于工艺方法对旋压制品质量的影响,而对旋轮工作状态的研究较少。因此,本文基于弹塑性力学理论,采用有限元方法研究了旋轮在旋压过程中的力学行为和磨损机理,并对铝合金锥形件旋压进行了实验研究。采用有限元分析软件DEFORM-3D,对铝合金锥形件的变薄旋压工艺进行了有限元模拟。利用二步法,先建立了锥形件旋压过程有限元模型,对旋压过程进行了模拟,得到了旋轮的受力数据;然后建立了旋轮受力模型,将第一步所得的受力数据施加于旋轮上,分析旋压过程中旋轮的受力状态。并对比了不同减薄率和旋轮进给速率下旋轮的应力和变形量的变化规律;结果表明,减薄率对旋轮最大应力和最大变形量的影响较为显著且呈正相关性;旋轮进给速率与旋轮最大应力和最大变形量之间并非正相关关系。建立了旋轮的磨损模型,对旋轮在旋压过程中的磨损情况进行了模拟。分析了旋轮工作面上磨损带的演化过程。对比了旋轮在不同初始硬度、摩擦系数以及旋轮进给速率下的最大磨损量,分析了旋轮在不同工况下的磨损形式的变化规律;结果表明提高旋轮的初始硬度、降低摩擦系数可以显著减小磨损量,在一定范围内适当调整旋轮进给速率也可以有效降低旋轮的最大磨损量。采用数控旋压实验平台成功旋压出了铝合金锥形件,通过对比旋压实验过程中采集的旋轮载荷数据与数值模拟结果发现,实验结果与数值仿真结果变化趋势一致,验证了本文建立的旋压过程有限元模型的有效性。
[Abstract]:Spinning is an advanced plastic forming technology, which is widely used in aerospace, military production, mechanical engineering and commodity production, with the advantages of small deformation, saving raw materials, high strength of products and so on.In recent years, many domestic scholars have studied spinning technology, mainly focusing on the effect of process methods on the quality of spinning products, but less on the working state of spinning wheel.Therefore, based on the theory of elastic-plastic mechanics, the mechanical behavior and wear mechanism of rotating wheel during spinning are studied by finite element method, and the spinning of aluminum alloy conical parts is studied experimentally.The thin spinning process of aluminum alloy tapered parts was simulated by finite element analysis software DEFORM-3D.By using the two-step method, the finite element model of the spinning process of the conical part is established, and the stress data of the spinning wheel are obtained by simulating the spinning process, and then the force model of the rotary wheel is established, and the force data obtained from the first step are applied to the rotary wheel.The stress state of the wheel during spinning is analyzed.The effect of thinning rate on the maximum stress and maximum deformation of rotary wheel is significant and positive correlation is obtained by comparing the variation of stress and deformation under different thinning rate and feed rate of the rotary wheel, and the results show that the effect of thinning rate on the maximum stress and the maximum deformation of rotary wheel is significant.There is no positive correlation between the feed rate and the maximum stress and deformation of the rotary wheel.The wear model of rotary wheel was established, and the wear of rotary wheel during spinning was simulated.The evolution process of wear zone on rotary wheel face is analyzed.In this paper, the maximum wear amount of the rotary wheel under different initial hardness, friction coefficient and feed rate is compared, and the wear patterns of the rotary wheel under different working conditions are analyzed, the results show that the initial hardness of the rotary wheel is improved.Reducing the friction coefficient can significantly reduce the wear rate of the rotary wheel, and adjust the feed rate of the rotary wheel in a certain range can also effectively reduce the maximum wear rate of the rotary wheel.Aluminum alloy conical parts were successfully spun by numerical control spinning experiment platform. By comparing the data of wheel load collected during spinning experiment with the numerical simulation results, it was found that the experimental results were consistent with the numerical simulation results.The validity of the finite element model of spinning process established in this paper is verified.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG306

【参考文献】