阀体压铸充型凝固过程数值模拟及工艺研究

发布时间：2018-03-31 08:04

  本文选题：压铸　切入点：数值模拟　出处：《沈阳理工大学》2017年硕士论文

【摘要】：压力铸造(压铸)因为其独特的材料成型工艺,广泛的应用于零件生产中,但因模具的非合理设计而造成的压铸缺陷会影响到压铸件的表观质量和使用性能。在传统工艺中设计人员使用试模的方法完成对某种铸造工艺的检验,这种方法耗时多,成本高。如何在压铸模具设计前期发现可能存在的结构问题对于后期压铸参数的有效调整、生产高质量产品是极其重要的。铸造数值模拟的发展很好的解决了上述问题。经过多年的发展铸造数值模拟已被证明能够有效的设计、修改压铸工艺,改进模具结构,从而降低产品试制周期,降低生产成本,提高材料利用率。阀体作为阀门上的重要零件,其质量的好坏会影响到经济的发展甚至威胁到生命安全,因此在生产高质量的阀体零件对于生产者以及消费者都是至关重要的。以浇注温度、模具预热温度、浇注速度、内浇口面积、内浇口厚度、内浇口宽度以及压射比压为因素,以卷气量、充型时间、凝固时间、缺陷含量等为指标建立七因素三水平正交实验。使用ProCAST铸造模拟软件对每组正交实验进行压铸过程数值模拟,通过对比分析不同正交实验下金属液体的流动过程、凝固状态、卷气状态、缺陷含量等,确定了阀体压铸件采用扁平侧浇浇口,其尺寸是:面积75mm2、厚度2.5mm、长度2mm;压铸工艺参数:浇注温度620℃、预热温度200℃、浇注速度0.5m/s、压射比压70MPa。根据模拟结果设计并制造了阀体压铸模具,进行压铸实验,通过金相实验得到了合格阀体压铸件产品,验证了铸造模拟仿真的科学性,可靠性。
[Abstract]:Pressure casting (die casting) is widely used in parts production because of its unique material forming technology. However, the defects of die casting caused by the unreasonable design of the die will affect the apparent quality and performance of the die castings. In the traditional process, the designers use the method of mold test to complete the testing of a certain casting process, which takes a lot of time. High cost. How to find the possible structural problems in the early stage of die casting die design for the effective adjustment of die casting parameters, It is very important to produce high quality products. The development of numerical simulation of casting has solved the above problems well. After years of development, numerical simulation of casting has been proved to be able to effectively design, modify the die casting process, improve the structure of the die. As an important part of valve, the quality of valve body will affect the development of economy and even threaten the safety of life. Therefore, the production of high quality valve body parts is essential for both producers and consumers. Factors such as pouring temperature, mold preheating temperature, pouring speed, internal gate area, inner gate thickness, inner gate width, and injection specific pressure are factors, Seven factors and three levels of orthogonal experiments were established by taking the volume of gas volume, filling time, solidification time and defect content as indexes. Each group of orthogonal experiments was numerically simulated by using ProCAST software. By comparing and analyzing the flow process, solidification state, entrainment state and defect content of metal liquid under different orthogonal experiments, the flat side pouring gate was determined for the valve body die casting. The die casting process parameters are: pouring temperature 620 鈩，

本文编号：1689853