How to reduce the generation of porosity and shrinkage during the die-casting process?
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2024/07/15 14:12:54 *
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During the die-casting process, the generation of porosity and shrinkage can be reduced by the following methods:
Optimize mold design
Ensure that the pouring system design of the mold is reasonable, so that the metal liquid can fill the mold cavity smoothly and evenly, avoiding turbulence and spraying phenomena.
Reasonably set up exhaust slots to effectively discharge gas from the mold cavity during the die-casting process.
Select appropriate die-casting process parameters
Control the pressure and speed during die casting, using appropriate slow and fast injection speeds to avoid excessive gas being drawn into the metal liquid when filling the mold cavity.
Adjust the die-casting temperature, including the temperature of the molten metal and the mold temperature, to achieve a suitable match and improve the fluidity of the molten metal.
Improve the quality of molten metal
Perform sufficient degassing treatment on the molten metal to remove dissolved gases.
Ensure the purity of the molten metal and avoid the mixing of impurities.
Improve the smelting process
Adopt appropriate melting methods and equipment, strictly control the temperature and time during the melting process, and reduce gas absorption.
Increase and shrink
Design a reasonable sprue and riser system to provide sufficient liquid metal for shrinkage compensation, in order to compensate for the volume shrinkage caused by casting solidification.
Timely maintenance of molds
Regularly inspect the working condition of the mold to ensure good sealing and prevent gas from entering the mold cavity.
Timely repair and maintenance of molds to avoid mold wear or deformation affecting casting quality.
Adopting vacuum die casting or local pressure technology
Vacuum die casting can extract gas from the mold cavity before die casting, reducing the formation of pores.
Local pressure technology can apply additional pressure to areas prone to shrinkage during the solidification process of castings to supplement shrinkage.
Reasonably arrange the production sequence
For castings with complex shapes, arranging the order of die-casting reasonably is beneficial for the flow and shrinkage of the molten metal.
By comprehensively applying the above methods, it is possible to effectively reduce the occurrence of porosity and shrinkage during the die-casting process, and improve the quality of castings.
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