Gravity Castings

Your Professional Gravity Castings Supplier

RMC Foundry is a China-based manufacturer specializing in precision metal casting and CNC machining for global OEM industries. Our capabilities include sand casting, investment casting, shell mold casting, lost foam casting, vacuum casting, machining, heat treatment, and surface finishing. We produce ferrous and non-ferrous metal parts used in industrial equipment, automotive, pumps, valves, agriculture, construction machinery, and energy applications.

Advanced Manufacturing Capabilities

RMC operates integrated casting and machining workshops with modern production equipment and engineering software. This allows us to manufacture complex and high-precision metal parts with stable quality.

Strict Quality Control

Quality inspection is applied from raw materials to final machining. Chemical analysis, dimensional inspection, and process audits help ensure every batch meets customer specifications and traceability requirements.

Flexible OEM Manufacturing

We support custom production based on drawings, samples, or technical requirements. Our engineering team works closely with customers to improve manufacturability and reduce production costs.

One-Stop Production Service

From tooling and casting to machining, heat treatment, surface treatment, and logistics, RMC provides complete manufacturing support to simplify supply chain management for overseas buyers.

Custom Aluminium Alloy Gravity Casting

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Aluminium Alloy Gravity Casting

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Aluminium Castings By Gravity Casting

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Specification

Casting Material	Aluminium alloy ADC12 A380 A356 ZL101 102 104
	Zinc alloy: ICE#1 #2 #3
	Stainless steel: 303 304 316
	Brass copper green tin copper
	Cast iron ball mill cast iron
Polishing Tech	Cast deburring machined surface treatment packaging
Surface Treament	According to requirement
Tolerance	+/-0.02MM or as required by the drawing

Advantages of Gravity Castings

High-Quality Finish

The low porosity of the resulting parts offers low degree of metallization when using gravity die casting. The ability to shape the mold in precise details allows the mold to produce clean and intricate parts which gives better appearance.

Cost-Effectiveness for Large Production Runs

This method of casting is relatively cheap especially when it comes to mass production of medium to large quantities. You remake using the same molds several times and hence saving more on the materials and cost of labor than in sand casting where you use disposable molds.

Superior Strength of Cast Components

Components manufactured using this process boast enhanced mechanical properties and resistance to wear and tear. The controlled cooling and solidification enhance the minimize porosity and increase in the structural density.

Applications of Gravity Castings

Automotive Parts

With gravity die casting, you get strong and lightweight car components such as engine blocks, cylinder heads, and transmission cases. This method provides high accuracy of the dimensions as well as high resilience due to high standards of automotive industry demands.

Industrial Machinery

You use gravity die casting in making parts for industrial machines, including pumps, gears, and valves. This method helps to provide durability, accuracy and reliability in case of components that are to be subjected to heavy usage.

Aerospace Components

You integrate gravity die casting for vital parts of aircrafts such as airframes, turbine shelters, and structural braces. The process offers impressive specific strength and indicates the attributes useful in high-reliability applications.

Consumer Goods

Gravity die casting enables you to establish high-quality and good-looking consumer products like chafing dishes and polished lamps and electronic casings.

Materials Used in Gravity Castings

Steel

Certain low-alloy steels with relatively lower melting points can be used for gravity die casting applications where specific mechanical properties are required.

Magnesium

Magnesium and magnesium-aluminum alloys are commonly used with gravity die casting due to their low density, very high strength-to-weight ratio, and excellent machinability.

Aluminum Alloys

At the industry as a whole, aluminum and its broad range of alloys are the most commonly exploited materials for gravity die casting due to their relatively low melting point, good fluidity when molten, relatively low cost, and favorable mechanical properties in the finished product.

Cast Irons

Cast iron is appreciated for its low raw material cost, toughness, and excellent wear resistance. It also offers good heat resistance and vibration-damping properties.

Copper Alloys

Copper alloys are widely used in gravity die casting, particularly for parts requiring good electrical conductivity or excellent thermal conductivity, such as bus bars, switch gear, and interconnect components in electrical systems.

Zinc

Zinc and zinc alloys, are widely used in gravity die casting due to their relatively low melting points, very low viscosity in the melt, and the naturally good surface finish they produce.

Gravity Castings Process Flow

Step 1:

Initially, the mold is prepared and pre-heated made from “permanent” materials like metal.

Step 2:

The metal, melted to a precise temperature (between 700 °F and 2,500 °F), is then poured into the mold.

Step 3:

The force of gravity ensures the molten metal fills the mold cavity completely, capturing the intricate details and desired shape.

Step 4:

After cooling and solidification, the cast part is ejected from the mold, undergoing various post-processing techniques to meet the final specifications.

Ordering Process

Inquiry & Quotation

Confirming Details / Cost Reduction Proposals

Tooling Development

Trial Casting

Samples Approval

Trial Order

Mass Production

Continuous Order Proceeding

Packaging and Shipping

Packaging	Bubble + Carton + Wooden Case
Shipping	We have long-term partnerships with DHL, UPS, FedEx, TNT, and EMS, and can arrange air or sea freight for large orders.

Our Factory

RMC was founded in 1999 by our founding team based in Qingdao, Shangdong, China. With its foundry and machining workshop also in Shandong province, we have now grown to become one of the finest metal forming companies with processes of sand casting, lost wax casting (investment casting), shell mold casting, lost foam casting, vacuum casting, precision forging, machining and post-processes such as surface treatment and heat treatment.

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: What is the difference between gravity casting and other types of casting?

A: Sand Casting: The main difference between gravity casting and sand casting is that gravity casting uses a reusable metal mold filled with molten metal poured under gravity, while sand casting utilizes expendable sand molds.

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.