The difference between gravity casting and low pressure casting

Due to the advantages of strong plasticity, light weight, high strength and easy processing, aluminum alloys are increasingly used in lightweight vehicles and new energy vehicles. At the same time, it is also widely used in aerospace, shipbuilding and other fields. With the development of China's manufacturing industry, the demand for aluminum alloy castings is increasing, which will also promote the development of the aluminum alloy casting industry.
At present, the casting methods of aluminum alloy include sand casting, metal casting, die casting, squeeze casting, etc.
What are the similarities and differences between low-pressure casting and gravity casting?
Low-pressure casting process: use dry and clean compressed air to press the aluminum liquid in the holding furnace from bottom to top through the riser and gating system to the mold cavity of the casting machine and maintain a certain pressure until the pressure is released after the casting is solidified. This process fills and solidifies under pressure, so it has good filling property, less shrinkage porosity and high compactness.
Low pressure casting production line
Gravity casting process: the process of injecting molten metal into the mold under the action of the earth's gravity, also known as pouring. Gravity casting can also be divided into sand mold casting, metal mold (steel mold) casting, lost foam casting, etc.
gravity casting
Mold selection: both are divided into metal mold and non-metallic mold (such as sand mold and wood mold).
Material utilization ratio: low-pressure casting is suitable for producing thin-walled castings, and the riser occupies little material; Gravity casting is not suitable for producing thin-walled castings, and a riser is required.
Labor environment of workers: low-pressure casting is mostly mechanized operation, and the intelligent operation environment is good; In gravity casting, some workers are needed to assist the pouring operation.
When considering whether to choose low pressure or gravity process for production, the casting process personnel shall comprehensively evaluate and determine the difficulty of the product, product performance requirements, cost and other factors. Generally, low pressure casting is used for thin-walled and complex parts with high performance requirements.