The SHP34-500 A multifunctional liquid forming equipment was utilized to trial-produce ZAlSi7 Mg aluminum alloy diaphragm for mine shells

and the structure evolution and mechanical properties of the castings at different specific pressures

pouring temperatures and pressure holding times were investigated. The results indicate that with the increase of the specific pressure and holding time

and the decrease of the pouring temperature

the grain size of the casting presents a decreasing trend. After optimization

the optimal squeeze casting process parameters are specific pressure of 130 MPa

pouring temperature of 720 ℃

and holding time of 20 s

where the tensile strength

yield strength and elongation reach 209.9 MPa

121.8 MPa

and 10.3%

respectively

after casting body sampling. After heat treatment

the tensile strength

yield strength and elongation are 259 MPa

179.6 MPa

and 11.8%

respectively.