In order to optimize the extrusion casting process parameters and improve mechanical properties of the squeezing casting parts

the casting temperature（A）

extrusion pressure（B）and holding time（C）were selected as the optimization variables

tensile strength

hardness and elongation as response performance indicators.The response surface analysis method was adopted to establish the corresponding predictive regression model and carry out analysis of variance to obtain the affecting significance of various parameters and their interaction effects on the mechanical properties of the squeezing castings.The optimized combination of process parameters was obtained by using Design-Expert software as follows:pouring temperature of 750℃

extrusion pressure of 150 MPa and holding time of 21.37 s.