Low-pressure casting is commonly used in the production of many aluminum parts and is widely encountered in everyday life. However, if surface treatment during the manufacturing process is inadequate, it can significantly compromise product quality. Therefore, when selecting low-pressure castings, there are several key factors that demand careful attention. What should we keep in mind? Let’s explore together.

Are you familiar with the surface treatment technologies used for low-pressure castings?

The coating process is typically divided into spray coating, powder coating, and electrophoretic coating. After surface treatment of the workpiece, the appropriate coating process and equipment are selected based on the specific appearance and corrosion‑resistance requirements of the part, with careful control of leveling, drying, cooling, and other stages; otherwise, adverse effects may compromise product quality. In general, spray coating delivers superior aesthetic results. Spray coatings exhibit excellent gloss, color stability, and weather resistance, making them well suited for applications with stringent appearance demands, such as automotive exterior finishes and motorcycle fuel tanks.

As is well known, the processing system in low-pressure casting can influence the entire operational process. So, what factors affect low-pressure casting?

A well‑designed low‑pressure die can effectively clear the feeding channels during the forging process and promote a smooth, rapid sequential solidification, ensuring solidification progresses from the far end toward the riser. This helps prevent forging defects and enhances production output. Typically, the die should be preheated to 400–450°C. If the temperature of the low‑pressure casting die is too low or too high, it will disrupt the optimal thermal field, making it difficult to form the casting or reducing its yield rate. The coating on the die surface provides resistance to thermal shock. The type, particle size, and thickness of the spray‑applied coating directly influence the performance of the cast part.

In the production of low-pressure castings, it is essential to control and inspect casting quality. We must establish procedures and technical specifications to monitor and verify each specific product, from raw materials and auxiliary materials to process compliance. Each process is rigorously controlled and inspected in accordance with its prescribed rules and technical requirements.

Low-pressure castings feature a dense microstructure, excellent gas tightness, stable dimensional accuracy, and reduced machining requirements, making them well suited for a wide range of sealed, pressure‑bearing components. We offer custom mold development based on your drawings or samples, and can tailor the casting process to meet specific operating conditions. Non‑standard, irregularly shaped parts and special‑specification castings are also available on demand.