The design of the demolding mechanism of the die casting mold is crucial to ensure the smooth demolding of the casting. The following are some key aspects to achieve this goal.
First, choose the type of demolding mechanism reasonably. Common demolding mechanisms include push rod demolding, push tube demolding, push plate demolding, etc. For castings of different shapes and structures, it is necessary to select the most suitable demolding method according to their characteristics. For example, for thin-walled castings, push tube demolding may be more suitable because it can provide more uniform demolding force and avoid deformation of the casting. For castings with deep cavity structures, push plate demolding may be more advantageous and can provide greater demolding force.
Secondly, accurately calculate the demolding force. The magnitude of the demolding force depends on factors such as the shape, size, shrinkage rate of the casting, and the friction between the mold and the casting. Through accurate calculation, the minimum demolding force required to be provided by the demolding mechanism can be determined, so as to reasonably design the size and structure of the demolding mechanism. If the demolding force is too small, the casting may not be demolded smoothly; if the demolding force is too large, the casting or mold may be damaged.
When designing the demolding mechanism, the motion trajectory and stroke of the demolding mechanism also need to be considered. The motion trajectory of the demoulding mechanism should be consistent with the demoulding direction of the casting to avoid interference during the demoulding process. At the same time, the stroke of the demoulding mechanism should be large enough to ensure that the casting is completely separated from the mold. In addition, in order to improve the stability and reliability of demoulding, a multi-stage demoulding mechanism can be used to gradually increase the demoulding force to avoid damage to the casting caused by excessive demoulding force at one time.
The surface treatment of the mold also has an important influence on the demoulding effect. Appropriate surface treatment of the mold cavity, such as hard chrome plating, nitriding, etc., can reduce the friction between the mold and the casting, making the casting easier to demould. At the same time, good surface treatment can also improve the wear resistance and corrosion resistance of the mold and extend the service life of the mold.
In addition, the design of the cooling system should not be ignored. A reasonable cooling system can control the shrinkage of the casting, reduce the adhesion between the casting and the mold, and facilitate demoulding. When designing the cooling system, it should be ensured that the cooling is uniform to avoid local overheating or overcooling, which affects the quality of the casting and the demoulding effect.
In short, the demoulding mechanism design of die casting mold needs to consider multiple factors, including the type selection of demoulding mechanism, demoulding force calculation, motion trajectory and stroke design, mold surface treatment and cooling system design, etc. Only through careful design and optimization can the casting be demoulded smoothly and the production efficiency and product quality can be improved.
