大尺寸叶片成形过程模拟及实验研究

发布时间：2018-05-09 04:40

本文选题：板料成形 + 数值模拟　；参考：《陕西理工学院》2015年硕士论文

【摘要】：板料冲压成形是一种利用压力机与模具使板料产生分离或变形的加工方法,由于其具有操作简单,工艺过程便于机械化、自动化,生产效率高,成本低等优点,被广泛应用于汽车、航空、电器、仪表及国防等工业领域,在国民经济中占有极其重要的地位。冲压件的回弹是零件卸载过程产生的反向弹性变形,是板料冲压成形过程中普遍存在的不可避免的现象,且直接影响成形件的品质。某企业急需投产的煤浆槽底搅拌上、下叶片型面复杂,尺寸大,变形量相对不大,成形后回弹量大,严重影响到后续的焊接成形工艺,而企业采用的传统工艺方法存在模具设计开发周期长、成本高等缺点,且很难对复杂曲面叶片的回弹进行有效的控制。若能利用日益成熟的有限元理论和CAE技术,对该叶片的成形及回弹过程进行数值模拟分析,进而完成回弹补偿,将大大地缩短其模具设计生产周期,降低此产品的生产成本。本文利用板料成形数值模拟软件DYNAFORM,对上、下叶片的冲压成形过程进行数值模拟研究,分析其成形过程中坯料的应力、应变状态以及坯料的厚度变化情况,探讨此工件产生回弹缺陷的主要原因,提出了解决其回弹缺陷的方案。利用DYNAFORM数值模拟软件对此叶片进行了回弹分析,对模具型面进行了回弹补偿,并提取了补偿后的模具型面。根据相似原理,采用补偿后的模具型面设计了等比例模具,并进行了叶片冲压成形试验研究,验证了数值模拟结果,为企业加工钢模提供理论设计依据。
[Abstract]:Sheet metal stamping forming is a kind of processing method which uses press and die to separate or deform sheet metal. Because of its advantages such as simple operation, convenient mechanization, automation, high production efficiency and low cost, etc. It is widely used in the fields of automobile, aviation, electrical appliance, instrument and national defense, and plays an extremely important role in the national economy. The springback of stamping parts is the reverse elastic deformation caused by the unloading process of the parts. It is an inevitable phenomenon in the process of sheet metal stamping, and directly affects the quality of the forming parts. In a certain enterprise, when the bottom of coal slurry is agitated at the bottom of the trough, the shape of the lower blade is complex, the size is large, the amount of deformation is relatively small, and the amount of springback after forming is large, which seriously affects the subsequent welding forming process. The traditional process methods adopted by enterprises have the disadvantages of long design and development cycle, high cost and so on, and it is difficult to control the springback of complex curved blade effectively. If the forming and springback process of the blade can be simulated and analyzed by using the increasingly mature finite element theory and CAE technology, and then the springback compensation can be completed, the design and production cycle of the die will be greatly shortened and the production cost of the product will be reduced. In this paper, the numerical simulation software DYNAFORM is used to simulate the forming process of upper and lower blades, and the stress and strain state of the blank and the thickness of the blank during the forming process are analyzed. The main reason of springback defect of this workpiece is discussed, and the scheme to solve the springback defect is put forward. The springback analysis of the blade was carried out by using DYNAFORM numerical simulation software, and the die surface was compensated by the springback compensation, and the compensated die surface was extracted. According to the principle of similarity, the equal proportion die is designed by using the compensated die surface, and the experimental research on the stamping forming of the blade is carried out, which verifies the numerical simulation result, and provides the theoretical design basis for the steel die processing in the enterprise.
【学位授予单位】：陕西理工学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG386

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