Low-Pressure Die Casting
Low-pressure die casting (LPDC) is a counter-gravity process that uses low-pressure gas (20 to 60 kPa) to push molten metal smoothly up from the bottom of the holding furnace into the die, where it solidifies under pressure. The smooth fill reduces splashing and oxide inclusions, and holding pressure during solidification keeps the casting structure dense with strong mechanical properties. Dimensional accuracy and surface quality are both higher than ordinary gravity die casting.
Low-pressure die casting suits thinner-walled parts, reaching 2 to 3 mm walls and complex internal cavities. Because the metal rises slowly and fills evenly, gas porosity and slag inclusions are reduced. The result is a smooth surface finish and stable dimensions, and compared with gravity casting, higher production efficiency that suits larger runs.
The process offers good surface finish and stable dimensions. Compared with gravity die casting, it also provides higher production efficiency and is therefore well suited for medium- to high-volume production.
Low-Pressure Die Casting Machine
Die-Cast Disc
Power Controller Housing
Coupling Disc
Common aluminum casting alloys such as ADC12, ZL101, and ZL104 are well suited to low-pressure die casting.
- Aluminum Alloys: A356 (ZL101), A357 (ZL101A),ZL104,ADC12, A360, A380, 319, 413, 443, 518, 713
- Aluminum-Copper Alloys: 201, 206, 224, ZL201, ZL203
- Aluminum-Magnesium Alloys: 514, 515, 520, ZL301, ZL302
- Aluminum-Silicon Alloys: A356, A357, A413, ZL109, ZL111
- Magnesium Alloys: AZ91D, AM60B, AM50A, AS41B, ZK61
| Minimum Wall Thickness | 2-3 mm |
| Part Weight Range | 0.2-50 kg |
| Surface Roughness | Ra 6.3-12.5 μm |
- Melting and holding →
- die preheating →
- coating spray →
- die closing →
- metal rise and fill →
- pressure holding and solidification →
- pressure release and backflow →
- die opening and part removal →
- gate cutoff →
- grinding →
- inspection and storage
- More than 30 years of manufacturing and export experience, with extensive knowledge of international logistics and industry-specific technical standards.
- Full support from tooling design and sample development through to high-volume production, precision machining, and surface treatment.
- A strict ISO 9001 quality management system, backed by CMM (coordinate measuring machine) inspection and non-destructive testing (MT, RT, PT).
