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Low-Pressure Die Casting is a metal casting technology used to produce various alloy parts. It involves pouring molten metal under pressure into a sealed mold. Relative to high-pressure die casting, this method typically uses lower pressure, which causes the metal to fill the mold more slowly.
Low-pressure die casting generally requires longer filling times than high-pressure die casting, but it provides higher metal density, produces fewer bubbles and less internal tension, which means the manufactured product is more stable and of higher quality. high.
Low-pressure casting is a process for forming castings under the pressure of filling liquid metal. The process includes the following steps:
- Heating of Liquid Aluminum Material: Heat the liquid aluminum material to the appropriate temperature, usually between 600-700 degree .
- Mold Opening: After complete solidification of the casting, release the gas pressure on the liquid surface, allowing the non-solidified metal in the riser to flow back to the crucible. Then, the cylinder opens the mold and pushes out the casting.
Low-pressure casting is characterized by high production efficiency and the ability to produce high-precision aluminum parts. It is especially suitable for producing precision castings, thin-walled aluminum alloy castings, and large aluminum alloy castings.
Low-pressure casting is a casting method that allows liquid metal to complete the process of filling the cavity and solidifying under pressure to obtain castings. Because the pressure used is low (20~60kPa), it is called low-pressure casting. The process is as follows: In a sealed crucible (or sealed tank), dry compressed air is introduced. Under the action of gas pressure, the metal liquid rises along the riser pipe into the sprue, smoothly enters the mold through the inner sprue cavity, and maintains the gas pressure on the liquid surface in the crucible until the casting is completely solidified. Then the gas pressure on the liquid surface is released, allowing the unsolidified metal liquid in the liquid riser to flow back into the crucible, and then the mold is opened and the casting is taken out.
- The casting crystallizes under pressure. The casting structure is dense, the outline is clear, the surface is smooth, and the mechanical properties are high. It is especially beneficial for the casting of large and thin-walled parts.
- The production efficiency is low compared with gravity die casting. Die Casting>Gravity>
Which is better, low-pressure casting or sand casting?
Low-pressure casting and sand casting each have their own advantages and application scenarios. Low-pressure casting is generally suitable for producing complex-shaped metal parts with higher engineering properties. It can produce more precise, denser castings and usually has lower porosity. This process is suitable for fields that require large quantities of high-precision, high-quality parts, such as automotive parts, aerospace parts, etc.
In contrast, sand casting is more flexible and cost-effective and is suitable for small batch production or larger parts with simple shapes. This casting method has a relatively simple and low-cost process, but it often cannot produce very high-precision parts.
Low-pressure casting and gravity casting
Low-pressure casting and gravity casting are two different casting methods, and they have some differences in terms of casting quality, production efficiency, process complexity, and application scenarios.
- Casting Quality: Gravity casting relies on the self-weight of the molten metal to fill the mold cavity, resulting in slightly lower density and quality of castings compared to low-pressure casting, which achieves higher precision.
- Production Efficiency: Gravity casting generally has higher production efficiency compared to low-pressure casting. Gravity casting can produce a large number of castings in a single cycle, making it more efficient.
- Process Complexity: Low-pressure casting is a more complex process compared to gravity casting. It involves the use of equipment like heating furnaces, pressure casting machines, and pneumatic systems and requires control of casting parameters such as temperature and pressure, making the process more intricate.Gravity casting, on the other hand, is relatively simpler and requires only a mold and casting equipment.
Low-pressure casting, due to its high casting quality and efficiency, is particularly well-suited for large-scale production requirements.
In summary, low-pressure casting and gravity casting each have their own unique characteristics, and the choice of casting method depends on specific needs and application scenarios.
In general, the minimum pressure typically required for die casting may range from a few hundred bars to thousands of bars, but the exact number will vary based on the factors mentioned above. For example, around 200 bar (2 MPa) may be required in some cases, while higher pressures may be required in other cases.
Low-pressure die casting is usually used to produce large-scale, structurally complex metal alloy parts, such as automotive parts, motorcycle parts, engineering machinery parts, and parts in the aerospace field. This process is ideal for the production of parts that require high density, low porosity, and internal stress. It produces parts that typically have high strength and durability and can meet precise design specifications through precise metal flow and filling processes.
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