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March 28, 2024

Factors and methods for roughness difference requirements of die castings

Reasons for the poor smoothness of Aluminum Alloy Die-Casting and improvement measures: Reasonably arrange the inner runner and raise its position to prevent the aluminum liquid from directly washing the surface with smoothness; increase the chamfer to guide the aluminum liquid to change the direction of filling the cavity , to prevent the pot liquid from directly washing the Die Casting Part, the relative position of the mold with standardized smoothness can effectively avoid hot spots at key positions and reduce the tendency of mold cracking. When the product structure does not allow it, we can discuss with the user to make appropriate changes to the product structure or wall thickness to achieve the goal. Without affecting the assembly and product performance, we can discuss with the user to partially enlarge the transition mesh angle or process matching. To prevent the mold from cracking too early due to too small wall thickness.

CAE analysis is carried out before product development to obtain a more appropriate pouring system, which can not only obtain good quality, but also avoid high pouring rates and boost pressures to extend the mold life. The original position and position of the gate made the filling process of liquid aluminum longer; after changing the position and position of the gate, the filling process of liquid aluminum was shorter, and the two stage speed and boost pressure were lower to ensure the quality of the product and the mold. So easy to crack. Strengthen the maintenance of the mold. After using it for several times, the mold must be annealed to remove stress. When making Aluminum Alloy Die casting molds, it is necessary to leave a grinding capacity within the allowable range of standard tolerances so that when slight cracks occur in the mold, the mold can be ground and the cracks broken to avoid cracks from re increasing and causing smoothness deviations.

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