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Gravity Casting

Your Professional Gravity Casting Supplier

Our goal is to be your reliable partner for gravity casting in China. Dexun is a global professional manufacturer of Foundry(Casting)&CNC machining products, with new product R&D design center. We have a skilled engineering team dedicated to refining every stage, from product development and process improvement to production oversight, ensuring every product delivered meets rigorous quality and performance standards. The price is competitive and the product is quality-assured, which is a good choice for your long-term cooperation.

Why Choose Us

Production equipment:

We have 16 CNC machining centers, 30 CNC lathes, 6 fully automatic CNC machines with automatic sampling equipment, 20 testing instruments, and die-casting machines, among other advanced production equipment.

Our certifications:

We hold two international certifications: ISO9001 & IATF16949 Certification and PPAP Level 3 Certification.

Our team:

We have 32 professional technicians, 14 senior engineers, and a dedicated R&D team of 15 people.

Our services:

Our team of experts will recommend the most suitable products according to customer needs and provide detailed consultation, we ensure timely delivery, and we provide long-term service support.

Advantages of Gravity Casting

Superior design flexibility:

Enables intricate geometries (thin-walled structures, internal cavities, and undercuts) unreachable by conventional casting methods through reusable precision molds.

Cost-effective tooling:

Permanent molds (metal or graphite) reduce per-unit costs for mid-to-high volume production compared to expendable mold processes like sand casting.

Enhanced metallurgical properties:

Controlled filling and directional solidification minimize porosity, yielding higher mechanical strength (≈15-25% improvement in fatigue resistance vs. Sand casting).

Tight dimensional tolerance:

Achieves near-net shape accuracy (ct8-ct10 per ISO 8062) with surface roughness ra 6.3-12.5 μm, minimizing post-machining requirements.

Sustainable process efficiency:

Lower energy consumption (30-40% reduction vs. High-pressure die casting) and recyclable molds align with circular manufacturing principles.

Specification of Gravity Casting

Product name	Gravity casting
Method of Filling	In die casting, molten metal is injected into the die under high pressures ranging from 10,000 to over 50,000 psi.
Part Size and Weights	Typical die-cast part sizes range from an ounce to 75 lbs.
Surface Finish	Die-cast surfaces have a characteristic smooth and glossy finish. Rapid cooling in the metal die gives fine grain sizes.
Dimensional Accuracy	Die casting offers excellent dimensional accuracy and consistency. Tolerances up to ±0.005

Features of Gravity Casting

Gravity casting features include good surface finish, excellent mechanical properties, high dimensional accuracy, and consistency, achieved by using only gravity to fill reusable permanent molds.

The process is cost-effective for medium to large production runs, yields high-density, less porous parts, and can cast a wide range of alloys.

Application of Gravity Casting

Automotive lightweight components:

Ideal for aluminum alloy engine brackets, transmission housings, and ev battery trays requiring thin walls (2.5-4mm) with ISO ct9 dimensional stability and <1% porosity.

Aerospace turbine ancillaries:

Fabricates nickel-based superalloy guide vanes and combustor liners with directional solidification control for creep resistance at 800-1000°c operating temperatures.

Hydraulic/valve systems:

Produces pressure-resistant bronze/ductile iron valve bodies (pn16/pn25 ratings) with integrated flow channels, eliminating 70-80% of post-casting assembly steps.

Medical implant prototyping:

Enables cost-efficient titanium (ti-6al-4v) orthopedic trial components with ra ≤6.3 μm as-cast surfaces for biocompatibility testing pre-machining.

Process of Gravity Casting

Pattern creation: The process begins with the creation of a pattern, which is a replica of the desired final part. The pattern is typically made from wood, plastic, or metal and is used to create the mold.

Mold preparation: Two mold halves, usually made of steel or sand, are prepared. The molds are cleaned and coated with a lubricant to prevent sticking and aid in easily removing the casting.

Mold assembly: The two mold halves are securely clamped together, creating a closed mold cavity. The mold is designed with gating and riser systems to facilitate the flow of molten metal and allow for the escape of gases during solidification.

Mold preheating: The assembled mold is preheated to a specific temperature. Preheating helps in achieving better metal flow and solidification during the casting process.

Molten metal preparation: The metal, often aluminum or other non-ferrous alloys, is melted in a furnace or crucible. The metal is heated to its appropriate casting temperature, determined based on the specific material used.

Pouring: Once the molten metal reaches the desired temperature, it is poured into a ladle or pouring basin. From there, the metal is poured into the mold cavity using gravity.

Solidification: As the molten metal fills the mold cavity, it gradually solidifies and forms a pattern within the mold.

Cooling and solidification: The filled mold can cool and solidify for a sufficient time, typically until the entire casting has solidified.

Mold opening: The mold is opened once the casting has solidified and cooled adequately. The two mold halves are separated, revealing the solidified casting inside.

Casting removal: The casting is removed from the mold cavity. It May require some shaking or gentle tapping to ensure complete release from the mold.

Finishing: The casting May undergo further finishing operations, such as grinding, sandblasting, machining, or surface treatments, to achieve the desired final appearance, dimensions, and surface quality.

Packing and Shipping of Gravity Casting

Packing	Bubble bag+box+pallet
Shipping	Shipped by road, sea, rail

FAQ

Q: What makes gravity casting suitable for producing complex parts?

A: The process allows molten metal to flow naturally into the mold (versus using pressure), ensuring consistent filling of complex mold cavities.

Q: How does gravity casting ensure high-quality surface finishes?

A: The consistent flow of metal into the mold minimizes turbulence and air entrapment. This results in parts with almost no internal defects and a uniform surface texture.

Q: Can gravity casting be used for mass production?

A: Yes, gravity die casting can be used for mass production, especially when producing medium to large-sized parts. While it May not be as fast as other high-pressure casting methods like die casting, gravity casting can still achieve relatively high production rates.

Q: Is gravity casting the same as permanent mold casting?

A: The short answer is yes. Both processes use steel dies. The metal is just introduced into the die differently but neither is introduced under any pressure.

We're professional gravity casting manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy cheap gravity casting for sale here from our factory. Quality products and low price are available.

Metal Gravity Casting, Aluminum Gravity Casting, Gravity Sand Casting