FAQ
13
Can you produce custom low pressure casting parts?
Yes, we accept customized low pressure casting projects with full OEM service.
14
Do you provide heat treatment for low pressure castings?
Yes, T5/T6 heat treatment is standard to achieve optimal mechanical properties.
15
What aluminum alloys are used in low pressure casting?
A356, A357, AlSi7Mg, and other high‑performance casting alloys.
16
Can low pressure cast parts pass pressure testing?
Yes, they are widely used in hydraulic and pneumatic systems requiring high leakproofness.
17
Is low pressure casting better than gravity casting?
It offers higher density and better pressure resistance, but has relatively higher equipment cost.
18
What parts are typically made by low pressure casting?
Automotive wheels, cylinder heads, pump bodies, valve bodies, high‑pressure hydraulic parts.
19
What are the main benefits of low pressure casting?
High internal density, excellent pressure tightness, uniform structure, suitable for high‑performance safety parts.
20
What is aluminum low pressure casting?
It uses low pressure to push molten aluminum upward into the mold, resulting in high density and low porosity.
21
What is the difference between PDC and GDC?
PDC (Pressure Die Casting) and GDC (Gravity Die Casting) are two common aluminum casting processes, differing in filling method, equipment, and application — here’s a detailed comparison:
Filling Method: PDC uses high pressure (10–150 MPa) and high speed (10–50 m/s) to inject molten metal into the die; GDC relies ongravity alone (no external pressure) to fill the mold, with a slow filling speed (0.1–0.3 m/s).
Production Efficiency: PDC is much faster (cycle time 10–60 seconds per piece, daily output up to 10,000 pieces) for mass production; GDC is slower (cycle time 2–5 minutes per piece, daily output up to 500 pieces) for medium batches.
Part Quality: PDC offers higher precision (tolerance IT8–IT10, surface roughness Ra 0.8–1.6 μm) but may have internal porosity; GDC has better internal density (porosity rate ≤1%) and is more suitable for heat treatment, with slightly lower precision (tolerance CT7–CT10, Ra 1.6–3.2 μm).
Cost: PDC has higher initial tooling costs (30–50% more than GDC) but lower unit costs for large batches; GDC has lower mold costs, making it ideal for small to medium batches (500–10,000 pieces).
Applications: PDC for high-volume, small-to-medium complex parts (e.g., electronic housings, automotive parts); GDC for thick-walled, high-strength parts (e.g., engine blocks, hydraulic components).
Filling Method: PDC uses high pressure (10–150 MPa) and high speed (10–50 m/s) to inject molten metal into the die; GDC relies ongravity alone (no external pressure) to fill the mold, with a slow filling speed (0.1–0.3 m/s).
Production Efficiency: PDC is much faster (cycle time 10–60 seconds per piece, daily output up to 10,000 pieces) for mass production; GDC is slower (cycle time 2–5 minutes per piece, daily output up to 500 pieces) for medium batches.
Part Quality: PDC offers higher precision (tolerance IT8–IT10, surface roughness Ra 0.8–1.6 μm) but may have internal porosity; GDC has better internal density (porosity rate ≤1%) and is more suitable for heat treatment, with slightly lower precision (tolerance CT7–CT10, Ra 1.6–3.2 μm).
Cost: PDC has higher initial tooling costs (30–50% more than GDC) but lower unit costs for large batches; GDC has lower mold costs, making it ideal for small to medium batches (500–10,000 pieces).
Applications: PDC for high-volume, small-to-medium complex parts (e.g., electronic housings, automotive parts); GDC for thick-walled, high-strength parts (e.g., engine blocks, hydraulic components).
22
What is the best aluminum alloy for die casting?
The “best” aluminum alloy for die casting depends on application, but ADC12 is the most widely used and cost-effective for general die casting, while A380 is optimal for high-strength, pressure-bearing parts. Key options and their use cases:
ADC12 (AlSi11Cu3): The industry standard for mass die casting. It has excellent fluidity, good machinability, and a tensile strength of ~200 MPa. Ideal for non-load-bearing parts like electronic housings, brackets, and automotive interior components — accounts for 60% of aluminum die casting orders globally.
A380 (AlSi8Cu3): Best for high-strength, pressure-tight parts (tensile strength ~240 MPa). It resists porosity and shrinkage, making it suitable for hydraulic components, engine parts, and pump bodies that require leak resistance.
A356 (AlSi7Mg): Ideal for heat-treatable, high-performance die cast parts. After T6 heat treatment, its tensile strength reaches 280–320 MPa, making it perfect for wheels, structural components, and aerospace parts (requires precision die casting).
For most B2B mass production (e.g., automotive, electronics), ADC12 is the best balance of cost, castability, and performance.
ADC12 (AlSi11Cu3): The industry standard for mass die casting. It has excellent fluidity, good machinability, and a tensile strength of ~200 MPa. Ideal for non-load-bearing parts like electronic housings, brackets, and automotive interior components — accounts for 60% of aluminum die casting orders globally.
A380 (AlSi8Cu3): Best for high-strength, pressure-tight parts (tensile strength ~240 MPa). It resists porosity and shrinkage, making it suitable for hydraulic components, engine parts, and pump bodies that require leak resistance.
A356 (AlSi7Mg): Ideal for heat-treatable, high-performance die cast parts. After T6 heat treatment, its tensile strength reaches 280–320 MPa, making it perfect for wheels, structural components, and aerospace parts (requires precision die casting).
For most B2B mass production (e.g., automotive, electronics), ADC12 is the best balance of cost, castability, and performance.
23
What materials are used in gravity die casting?
Gravity die casting (GDC) uses two key types of materials: mold materials and casting materials, both optimized for the process’s low-pressure, gravity-driven filling method.
Mold Materials: The reusable permanent mold (die) is typically made of cast iron or steel (e.g., H13 tool steel), which can withstand high temperatures (670–710°C for aluminum casting) and repeated use. Cast iron molds offer good heat retention and cost-effectiveness, while steel molds have higher durability (mold life 50,000–200,000 shots for aluminum alloys).
Casting Materials: Aluminum alloys are the most common (80% of GDC applications), including A356, A380, ADC12, AlSi9Cu3 — these have high fluidity and low shrinkage. Other materials include copper alloys (brass, bronze) and magnesium alloys, but aluminum is preferred for its lightweight, cost-efficiency, and mechanical properties. For high-strength parts, A356 T6 is the top choice for GDC, with tensile strength up to 320 MPa.
Mold Materials: The reusable permanent mold (die) is typically made of cast iron or steel (e.g., H13 tool steel), which can withstand high temperatures (670–710°C for aluminum casting) and repeated use. Cast iron molds offer good heat retention and cost-effectiveness, while steel molds have higher durability (mold life 50,000–200,000 shots for aluminum alloys).
Casting Materials: Aluminum alloys are the most common (80% of GDC applications), including A356, A380, ADC12, AlSi9Cu3 — these have high fluidity and low shrinkage. Other materials include copper alloys (brass, bronze) and magnesium alloys, but aluminum is preferred for its lightweight, cost-efficiency, and mechanical properties. For high-strength parts, A356 T6 is the top choice for GDC, with tensile strength up to 320 MPa.
24
Do you provide DFM analysis for gravity casting?
Yes, our engineering team provides Design for Manufacturability analysis to optimize structure and cost.
The company was founded in 2016, is a zinc alloy, aluminum alloy, copper casting, scientific research, development, production, sales as one of the professional custom cast aluminum parts manufacturers and enterprises.
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