基于灰色关联性分析的铝合金缸体铸造工艺参数优化

Casting Process Parameter Optimization of Aluminum Alloy Cylinder Block Based on Gray Correlation Analysis

以ZL114A铝合金发动机缸体为研究对象,在初始工艺的基础上,分别以合金浇注温度、充型加压速度、保压压力及保压时间4个工艺参数为影响因素,并以孔隙率和凝固时间为成形质量评价目标,基于田口设计方法设计16组正交试验,并基于灰色关联分析法进行多目标关联性分析。结果表明,优化方案工艺为浇注温度为700℃、充型加压速度为1.2 kPa/s、保压压力为65 kPa及保压时间为220 s。与初始工艺相比,优化方案工艺下合金的孔隙率下降了18.5%、凝固时间缩短了3.7%。经生产验证,铸件成形质量良好、力学性能优异,验证了优化方案工艺的可行性,有利于生产效率及产品合格率的提高。

Taking ZL114A aluminum alloy engine block as object,process parameters including pouring temperature,charging and pressurizing speed,holding pressure and holding time as influencing factors based on the initial process,and porosity and solidification time as molding quality evaluation targets,16 groups of orthogonal tests were designed based on Taguchi's design method,and the multi-objective correlation analysis was carried out based on gray correlation analysis method.The results indicate that the optimized combination of process parameters is determined as pouring temperature of 700℃,filling and pressurizing speed of 1.2 kPa/s,holding pressure of 65 kPa and holding time of 220 s,where the porosity and solidification time are reduced by 18.5%and 3.7%,respectively,compared to those of ones in the initial process.After production verification,the casting molding quality is desirable with excellent mechanical properties,verifying the feasibility of optimized process parameters,which is conducive to the improvement of production efficiency and product qualification rate.