Low-pressure casting is a mature and efficient metal forming process. It places the casting mold above a sealed holding furnace filled with molten alloy. By introducing compressed air, a stable low pressure of 500-2500 mbar is formed on the molten metal surface. The liquid metal rises steadily through the riser tube to fill the mold cavity and solidifies under controlled pressure. Compared with traditional high-pressure die casting and gravity casting, this technology features stable filling, dense casting structure and ultra-high material utilization rate, becoming a preferred process for high-precision and high-reliability non-ferrous alloy parts production.
Boasting prominent technical advantages, Longhua’s low-pressure casting solution delivers comprehensive upgrades in product purity, molding performance and production efficiency. The process adopts pure lower-layer molten metal for filling, effectively avoiding slag inclusion defects and improving casting purity. The adjustable pressure curve ensures stable liquid metal filling, eliminating turbulence, impact and splashing, and greatly reducing oxidative slag formation. Under pressure-assisted filling and solidification, the molten metal gains better fluidity, realizing precise molding of thin-walled, complex and large-size castings with smooth surface and clear outlines.
In terms of production cost and automation, low-pressure casting requires no riser in most scenarios, with a metal recovery rate of over 70%. The uncondensed alloy liquid in the riser tube can be recycled and reused, greatly saving raw material costs. With simple operation and excellent working conditions, the process is highly compatible with mechanization and intelligent transformation, supporting one-person multi-machine or unmanned automated production lines to meet modern factory’s high-efficiency and low-consumption production needs.
Widely adaptable, the low-pressure casting process is suitable for mainstream non-ferrous alloys including aluminum alloy, magnesium alloy and copper alloy, and supports multiple mold types such as sand molds, metal molds, graphite molds and gypsum molds. It covers a full range of high-end manufacturing scenarios, including automotive and motorcycle wheel hubs, engine blocks, cylinder heads, gearbox housings, chassis steering parts, turbocharger shells, aerospace magnesium-aluminum alloy components, high-speed rail structural parts, electrical power equipment accessories, bathroom hardware and special-shaped industrial castings.
With 40+ years of professional manufacturing experience, 14 national invention patents and complete independent intellectual property rights, Longhua provides full-set intelligent casting equipment and customized production solutions. The company’s low-pressure casting equipment balances low investment cost, stable operation and high finished product quality, perfectly serving global customers in automotive, aerospace, new energy, electrical engineering and hardware manufacturing industries.
