【作者】 王飞宇；

【导师】 于宝义；

【作者基本信息】 沈阳工业大学 ， 材料加工工程， 2007， 硕士

【摘要】 压铸是近代金属加工工艺中发展较快的一种高效率、少无切削的金属成形精密铸造方法，这种工艺方法已广泛地应用在国民经济的各行各业中。在压铸过程中，铸件内部经常出现气孔和缩孔、缩松等缺陷。针对该问题，本课题在铜合金压铸过程中，如何避免气孔缺陷以及压铸成型性等方面进行了研究。本文分析了Solidworks和ProCAST的数据结构。利用了两者接口的sm1+sm2=sm3形式解决了压射室运动模拟模型创建的问题。解决了数据接口难的问题，建立实验用慢压射压射室部分模型。并利用Shell模型在Pro／E环境中建立包括铸件与铸型实体表面的特殊壳体，该方法可以解决CAD／CAE软件之间数据传递问题。利用ProCAST模拟，得出在给定压射室参数条件下，慢压射加速度在2m／s~2时，压射室内金属液将气体完全排出，该加速度条件下，当模具温度200℃，浇注温度1150℃时，获得最佳铸件。真空压铸可减少铸件内部气孔、改善铸件表面质量和保持生产过程铸件尺寸的稳定性、降低压射比压，延长模具寿命。本文设计并制造了铜合金压铸用真空系统。并对该系统进行了计算验证。在真空压铸模具设计过程中，通过对原有铜合金轴承保持架模具的改造，实现了在不需全封闭模具的条件下，通过对排气道的多点抽气，加螺旋形排气道的方法，对模具型腔进行抽真空。该方法模具改进简单，减少技术难度和成本，并提高了铸件质量。推出慢压射理论加速度理论计算公式，以及真空压铸理论加速度理论公式，通过实际计算，得出实验室一定条件下的加速度范围1.39～4.4m／s~2，有效地解决了铜合金压铸过程中，由于压射室慢压射卷入气体以及压铸过程中常见气孔缺陷。从产品解剖的各个断面来看，产品出现缺陷的部位与凝固状况的模拟结果基本一致，从而达到预测产品缺陷的目的。通过该工艺参数，可以获得完整铸件。更多还原

【Abstract】 Die-casting is a sort of high efficiency, few cutting of metal figuration exactitude foundry method which developed quickly in latter-day metal process craft. This craft method has been widely used in every walk of work in nation economy. During the process of die-casting, the air hole and shrink hole frequently exist in the casting. This paper will research how to avoid air hole and the quality of mounding during die-casting.The date configuration of Solidworks and ProCAST was analysis in this paper, using the method of sm1+sm2=sm3 to solve the problem of simulation model construction. This solved the difficulty of date interface. And establish the shot sleeve module for slow shot phrase. Use the shell model to found the special shell between mould/casting in Pro/E. This method can solve the problem of date transfer between CAD/CAM.The air can be vent to cavity entirety when the slow shot acceleration is 2m/s~2 simulated by ProCAST under the present sleeve parameter. The best casting can be obtained when the model temperature is 200℃, the pour temperature is 1150℃under this acceleration.The vacuum die-casting can decrease air hole、improve the surface quality and keep the size stability、reduce the specific pressure、extend the life of mould. The Cu alloy vacuum die-casting system was designed and produced. The systems were computed to validate.During design the vacuum die-casting moulds, We realized vacuuming cavity of moulds without totally enclosing moulds by multi-spot bleeding of steam and spiral air channel through improve original Cu alloy bearing cage mould. This method was easy to mend mould, decrease the cost and the difficulty of technology, it also improve the quality of the casting.The slow shot theory equation and the vacuum die-casting theory equation was deducted, we obtain the range of acceleration 1.39-4.4m/s~2 under lab condition. The common flaw of gas hole generated by involved gas in the shot room was settled effectively in the course of Cu alloy die-casting.Judging from fractures of products, position of flaws in the products kept consistent with simulation results of solidifying state. The purpose of predicting flaws was realized. The perfect castings were obtained through these processing parameters.更多还原