In order to trace and optimize the factors influencing the quality of low-pressure casting

the dimension of the factors affecting the quality characteristic values was reduced using principal component analysis to obtain the principal components of the influencing factors. Then

the principal components were subjected to variance analysis and interaction analysis using response surface methodology to establish a regression model

and the response surface graph and the contour line of the main interaction factors were drawn. Finally

the values of the influencing factors ensuring the quality characteristic value optimal were presented as follows: the mold temperature of 300 ℃

the holding pressure time of 88.56 s

the crystallization pressure of 0.043 MPa

the liquid lifting speed of 130 mm/s

the pouring temperature of 710 ℃

the coating thickness of 1.7 mm

the mold preheating temperature of 220 ℃

the filling speed of 50 mm/s

and the Si content in the molten metal of 7.1%.