Die-casting die for automobile gearbox shell

The utility model relates to the field of automobile part manufacturing, and discloses a die-casting die for an automobile gearbox shell. When molten aluminum in a mold cavity is cooled to form a semi-solid casting, the extrusion driving mechanism drives the pressing head to extend to the surface of the casting through the push rod, the pressing head gradually extrudes the surface of the casting, a threaded hole site is formed through gradual extrusion, gas near an extrusion point is guided to the threaded hole site, and therefore air holes in the surface of the casting are reduced, and the casting quality is improved. And the surface smoothness of the automobile gearbox shell is improved. 本实用新型涉及汽车零部件制造领域，并公开了一种用于汽车变速箱壳体的压铸模具；当模具型腔内的铝液冷却形成半固态状的铸件时，挤压驱动机构通过推杆带动压头伸向铸件的表面，压头逐渐挤压铸件的表面，不仅逐渐挤压形成螺纹孔位，还将该挤压点附近的气体被引导至螺纹孔位，从而减少铸件表面气孔的产生，提高汽车变速箱壳体的表面光滑度。