【作者】 赵鑫；

【导师】 丁文江； 曾小勤；

【作者基本信息】 上海交通大学 ， 材料学， 2009， 硕士

【摘要】 应用专业铸造模拟软件AnyCastingTM和有限差分数值模拟技术,研究了不同浇注温度、不同快压射速度和不同快压射切换位置条件下,铝合金汽车空调压缩机缸体压铸过程中的充型顺序和温度场分布,并对充型过程中可能产生的缺陷进行了预测。通过测量铸件金相组织、密度、密度变化率及力学性能等方法,对数值模拟结果进行了验证。通过对不同变质工艺和不同铸造压力条件下铸件性能的研究表明,铸件的孔隙率随着浇注温度升高和快压射速度的增加而增大,随着快压射切换位置的增加而减小,随着铸造压力的增加先增大后变小。铸件的力学性能随浇注温度的增加而呈递减的趋势;随快压射速度的增加及快压射切换位置的增加,呈现先增大后减小的趋势;随铸造压力的增加,呈现递增的趋势。结果表明,生产铝合金汽缸体压缩机缸体的最佳工艺参数为:变质剂——HGPB-1、浇注温度——700℃-720℃,铸造压力——104MPa,压射速度——1.5m/s,快压射位置——320mm。更多还原

【Abstract】 In this contribution, the effects of five important process parameters, metal temperature, casting pressure, fast shot speed, fast shot set point on the properties of die casting R14 aluminum alloy air-conditioning compressor cylinder were investigated by the method of measuring the density of as-cast and heat treated casting、analyzing microstructure and testing the tensile properties.Numerical simulation is also used to describe the flow and temperature distribution at the different metal temperature, fast shot speed and fast shot set point in the platform of AnyCastingTM using Finite difference method.The result showed that higher metal temperature and fast shot speed increase the amount of the porosity; an increase in fast shot set point decrease the amount of the porosity; an increase in pressure increase the porosity first and then decrease. An increase in metal temperature decrease the UTS and elongation; an increase in fast shot speed and fast shot set point increase the UTS and elongation and the decrease; an increase in casting pressure increase the UTS and elongation. The optimum combination of modifying agent, melt temperature, casting pressure, fast shot speed and fast shot set point for generating the lowest porosity were HGPB-1 modifying agent, 700℃-720℃, 104Mpa, 1.5m/s, 320mm, respectively.更多还原