铝合金板材的成形性评价与无模充液拉深成形工艺优化
发布时间：2018-08-18 08:09
【摘要】：由于铝合金板材具有重量轻、抗腐蚀性能高等优点,这使其在机械制造行业中得到了广泛的使用。但是铝合金板材的机械性能参数不全,塑性较差,而且还是各向异性材料,因此在利用传统的冲压成形方法对铝合金板材进行冲压成形的过程中,经常会出现裂纹从而导致成形失败。若想成形成功就需要反复试冲,这样做不仅成本高、周期长而且经济效益低。为了解决以上问题,本文将以各向异性材料6022铝合金板材为研究对象,首先通过单向拉伸试验和凸模胀形试验来获得它的机械性能参数,并对其成形性能进行评价。然后利用ABAQUS有限元软件对6022铝合金板材的油底壳无模充液拉深成形过程进行模拟,并对其成形工艺进行优化。为了保证模拟过程的准确性以及能够准确的预测出板材在成形过程中是否会出现裂纹,本文将Barlet89各向异性屈服准则编写为ABAQUS用户子程序用来描述铝合金板材的屈服,并提出一种新的局所分叉理论作为失稳判据。本文通过单向拉伸试验和凸模胀形试验得到了6022铝合金板材的机械性能参数,并对其成形性进行了评价。并利用有限元软件模拟上述两个试验,以新提出的失稳判据预测裂纹的产生。将模拟结果与试验结果进行比较,验证了该失稳判据的正确性。最后利用该失稳判据对具有各向异性材料6022铝合金板材的油底壳无模充液拉深成形过程进行优化,找到了其合理的成形路径。
[Abstract]:Aluminum alloy sheet has been widely used in mechanical manufacturing industry because of its advantages of light weight and high corrosion resistance. However, the mechanical properties of aluminum alloy sheet are not complete, the plasticity is poor, and it is also anisotropic material. Therefore, in the process of stamping aluminum alloy sheet metal by traditional stamping method, Cracks often occur, leading to forming failure. If we want to be successful, we must try and punch again and again, which is not only high cost, long period, but also low economic benefit. In order to solve the above problems, the mechanical properties of anisotropic 6022 aluminum alloy sheet were obtained by uniaxial tensile test and bulging test, and its formability was evaluated. Then ABAQUS finite element software is used to simulate the forming process of the oil bottom shell of 6022 aluminum alloy sheet without liquid filling, and the forming process is optimized. In order to ensure the accuracy of the simulation process and to accurately predict whether cracks will occur in the forming process of the sheet metal, the Barlet89 anisotropic yield criterion is written as a ABAQUS user subprogram to describe the yield of the aluminum alloy sheet. A new bifurcation theory is proposed as a criterion of instability. In this paper, the mechanical properties of 6022 aluminum alloy sheet are obtained by uniaxial tensile test and punch bulging test, and its formability is evaluated. The above two tests are simulated by finite element software, and the new instability criterion is used to predict the occurrence of cracks. The correctness of the instability criterion is verified by comparing the simulation results with the experimental results. Finally, using the instability criterion, the forming process of oil bottom shell with anisotropic 6022 aluminum alloy sheet is optimized, and the reasonable forming path is found.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG306;TG146.21
本文编号：2188881
[Abstract]:Aluminum alloy sheet has been widely used in mechanical manufacturing industry because of its advantages of light weight and high corrosion resistance. However, the mechanical properties of aluminum alloy sheet are not complete, the plasticity is poor, and it is also anisotropic material. Therefore, in the process of stamping aluminum alloy sheet metal by traditional stamping method, Cracks often occur, leading to forming failure. If we want to be successful, we must try and punch again and again, which is not only high cost, long period, but also low economic benefit. In order to solve the above problems, the mechanical properties of anisotropic 6022 aluminum alloy sheet were obtained by uniaxial tensile test and bulging test, and its formability was evaluated. Then ABAQUS finite element software is used to simulate the forming process of the oil bottom shell of 6022 aluminum alloy sheet without liquid filling, and the forming process is optimized. In order to ensure the accuracy of the simulation process and to accurately predict whether cracks will occur in the forming process of the sheet metal, the Barlet89 anisotropic yield criterion is written as a ABAQUS user subprogram to describe the yield of the aluminum alloy sheet. A new bifurcation theory is proposed as a criterion of instability. In this paper, the mechanical properties of 6022 aluminum alloy sheet are obtained by uniaxial tensile test and punch bulging test, and its formability is evaluated. The above two tests are simulated by finite element software, and the new instability criterion is used to predict the occurrence of cracks. The correctness of the instability criterion is verified by comparing the simulation results with the experimental results. Finally, using the instability criterion, the forming process of oil bottom shell with anisotropic 6022 aluminum alloy sheet is optimized, and the reasonable forming path is found.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG306;TG146.21
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本文编号：2188881
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