Aluminum alloy is widely used in automobile manufacturing, aerospace, shipbuilding and other fields because of its good plasticity, corrosion resistance, and light weight. With the development of China\'s manufacturing industry, the demand for aluminum alloy and aluminum alloy castings is increasing, which will also promote the development of aluminum alloy casting industry. At present, the casting methods of aluminum alloy are divided into two types: pressure casting and gravity casting. MINGHE will analyze the differences and characteristics of the two casting processes in detail.
Aluminum alloy casting processes are roughly divided into two types: gravity casting and pressure casting.
Aluminum alloy pressure casting refers to the process of injecting molten metal into the mold under the action of other external forces (excluding gravity). Pressure casting is divided into high pressure casting and low pressure casting.
High-pressure casting is what we usually call die-casting. The molten aluminum is poured into the press chamber, and the mold cavity is filled at high speed by its pressure, and the molten aluminum is solidified under pressure to form aluminum castings.
The characteristics of aluminum alloy die castings are:
Aluminum alloy gravity casting refers to the process of injecting molten aluminum into a mold under the action of the earth\'s gravity. Gravity casting is divided into: sand casting, metal (steel mold) casting, lost foam casting, etc.
Now the most widely used is metal mold (steel mold) casting. The mold is made of heat-resistant alloy steel. The strength, size and appearance of cast aluminum castings are higher than those of other casting processes.
The molten aluminum of gravity casting is generally poured into the gate manually, and the cavity is filled with the weight of the molten metal, exhausted, cooled, and the mold is opened until the sample is obtained. The process flow is generally: molten aluminum smelting, casting filling, exhausting , Cooling, mold opening, cleaning, heat treatment, processing.
The characteristics of aluminum alloy gravity casting are:
When choosing which process to produce the product, the choice is mainly based on the wall thickness of the workpiece. When the wall thickness of the product is greater than 8mm, die casting will cause a lot of pores in the wall, so thicker products can be completed by gravity casting. .
