The selection of process parameters of lost foam casting has a very important influence on the mechanical properties of castings.L

9

（3

3

）three-factor and three-level orthogonal test design was used to carry out the ZL102 alloy lost foam casting under the combination of different casting process parameters

and strength and elongation of aluminum-silicon alloy castings were taken as the evaluation index of mechanical properties.According to the grey correlation analysis method

the multi-objective process parameters were optimized to obtain the optimal process parameters of ZL102 alloy lost foam casting and the influence degree of each process parameter on the mechanical properties of the casting.The results show that with the modifier of 3.5%

the casting wall thickness of 5 mm and the pouring temperature of 760℃

the mechanical properties of ZL102 casting present desirable performance and the influence order of process parameters on the mechanical properties of casting is presented as follows:casting wall thickness

>

pouring temperature

>

modifier dosage.