Use the VRH vacuum casting production line which been imported from Japan, and adopt the method that water glass sand each other combines, cast steel and iron castings-ball mill liners such as various kind wear-resisting and heat-resisting of production and corrosion preventive etc, end liners and check board with resin sand ; grid cools machine grid, and the vertical grinds machine mill rollers and nether millstones etc to crusher mandibles liners and swing hammers and impact plates and digger teeth. The casting's surface is so smooth, that the size is precision high for installed convenience.