Vacuum die-casting is an advanced die-casting process that eliminates or significantly reduces the pores and dissolved gases in the die-casting part by removing the gas in the die-casting mold cavity during the die-casting process, thereby improving the mechanical properties and surface quality of the die-casting part.
The aluminum-magnesium alloy die-casting parts produced by vacuum die-casting have been proved to be able to be processed by welding, heat treatment and other processing methods, and the room temperature performance has also been improved to a certain extent: for example, the AM60B magnesium alloy automobile has been successfully produced by vacuum die-casting on a cold chamber die-casting machine. Wheel hubs (anodized aluminum) were produced by vacuum die-casting on a hot-chamber die-casting machine with a clamping force of 2940kN to produce an AM60B magnesium alloy steering wheel. The die-casting elongation was increased from 8% to more than 16%.
As long as it is properly controlled, vacuum die casting can bring satisfactory improvements to the properties of die castings. The cost increase caused by mold sealing will be well solved with the popularization of technology and the cost allocation brought by mass production. Compared with the traditional die-casting method, the laminar filling method/ultra-low-speed die-casting method has low production efficiency, difficult gate cleaning, and is difficult to apply to mass production; the oxygen-filled die-casting method has complicated operation procedures, and the process parameters are not easy to control and difficult. Large-scale application in actual production; only the vacuum die-casting method, the process is simple, the operation is convenient, the production efficiency is almost the same as the ordinary die-casting method, and it is easy to promote in actual production.
Advantages of vacuum die casting:
The first highlight: vacuum die casting can eliminate or reduce the pores inside the die casting, improve the mechanical properties and surface quality of the die casting, and improve the plating performance;
The second highlight: the vacuum die casting method greatly reduces the back pressure of the cavity, and can use a lower specific pressure and alloys with poor casting properties, and it is possible to use a small machine to die-cast larger castings;
The third highlight: the vacuum die-casting method improves the filling conditions and can die-cast thinner castings;
The fourth highlight: Compared with the ordinary die casting method, the vacuum die casting method has almost the same production efficiency.
