1. Die casting pressure
During the die casting process, die casting pressure is a key parameter. For Valve chip die casting mold custom processing, the structural strength of the mold must be considered first. Higher die casting pressure requires the mold to have sufficient wall thickness and a solid frame structure to prevent the mold from deforming or even breaking during die casting. For example, when designing the core and cavity of the mold, high-strength mold materials will be selected and their sizes will be reasonably determined based on the estimated maximum die casting pressure. At the same time, the design of the gate and runner system must also adapt to the die casting pressure. Under high pressure casting pressure, the gate size may need to be appropriately increased to ensure that the molten metal can fill the cavity smoothly and quickly; while at lower die casting pressure, the gate size can be relatively reduced to avoid problems such as reflux of the molten metal.
2. Die casting temperature
The die casting temperature directly affects the fluidity and solidification characteristics of the molten metal. When custom processing valve die casting molds, the thermal conductivity of the mold must be considered. If the die casting temperature is high, the mold material should be selected with good thermal conductivity to quickly dissipate the heat and prevent local overheating of the mold. Inside the mold, the design of the cooling system should be optimized according to the die-casting temperature. For high-temperature die-casting, the layout of the cooling channel should be more dense and reasonable to ensure that the heat can be effectively removed and the temperature uniformity of the mold can be controlled. At lower die-casting temperatures, the parameters of the cooling system can be adjusted accordingly to avoid excessive cooling and premature solidification of the molten metal, which affects the molding quality of the valve plate.
3. Die-casting speed
The die-casting speed affects the filling state of the molten metal. When the die-casting speed is fast, the exhaust design of the mold becomes particularly important. When custom-making the mold, it is necessary to set up enough exhaust grooves or use special materials such as breathable steel to solve the exhaust problem. Because the fast die-casting speed may prevent the air in the cavity from being discharged in time, resulting in defects such as pores. In addition, for different die-casting speeds, the roughness and surface finish requirements of the runner system are also different. High-speed die-casting requires a smoother runner to reduce resistance, while the requirements for the surface finish of the runner can be relatively lower during low-speed die-casting.
4. Holding time
The length of the holding time affects the final density and dimensional accuracy of the valve plate. In mold customization, the deformation of the mold during the pressure holding process must be considered. A long pressure holding time may produce continuous pressure on the mold, which requires the mold to have good rigidity and stability. For example, by reasonably designing the mold support structure, the mold's pressure resistance during the pressure holding process can be improved. At the same time, the pressure holding time will also affect the demoulding process. A long pressure holding time may increase the adhesion between the valve plate and the mold, so the design of the demoulding mechanism must take this factor into account to ensure smooth demoulding at different pressure holding times.
