Injection Of Die Casting

Requirements for the mold sprue on the cold chamber horizontal die-casting machine:

① The inner diameter size of the pressure chamber should be selected based on the required specific pressure and chamber filling degree. At the same time, the inner diameter deviation of the gate sleeve should be appropriately enlarged by a few threads compared to the inner diameter deviation of the pressure chamber, so as to avoid the problem of punch jamming or severe wear caused by the different axes of the gate sleeve and chamber inner diameter, and the wall thickness of the gate sleeve should not be too thin. The length of the gate sleeve should generally be less than the delivery lead of the injection punch to facilitate the release of the coating from the pressure chamber.

② The inner holes of the pressure chamber and gate sleeve should be finely ground after heat treatment, and then ground along the axis direction, with a surface roughness of ≤ Ra0.2 μ m。

③ The splitter and the concave cavity that forms the coating have a concave depth equal to the depth of the transverse gate, and its diameter matches the inner diameter of the gate sleeve, with a slope of 5 ° along the demolding direction. When using a coating guide type sprue, the volume of the effective length of the pressure chamber is shortened, which can improve the filling degree of the pressure chamber.