Qingdao Rinborn Machinery Co., Ltd.
+86 186 6184 7678
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.
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Item |
Specification |
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Max Size |
1,000 mm × 800 mm × 500 mm |
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Weight Range |
0.5 kg – 100 kg |
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Annual Capacity |
2,000 Tons |
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Bond Materials for Shell Building |
Silica Sol, Water Glass, and Mixed Systems |
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Tolerances |
Available on Request |
Types of Investment Castings
The investment castings produced by our company mainly include the following types:
Precision Casting Stainless Steel Pump Body
The shell making is a very critical process during investment casting because it influences the precision accuracy of the final castings. The quality of the shell is directly related to the roughness and dimensional tolerance of the final casting.
Stainless Steel Investment Casting Pump Housing
Stainless steel investment casting pump housing is a high-precision, corrosion-resistant component produced via the "lost-wax" process, ensuring complex internal geometries, smooth surfaces, and high dimensional accuracy for hydraulic applications.
Stainless Steel Investment Castings
Stainless steel investment castings are "corrosion-resistant" when used in liquid environments and vapors below 1200°F (650°C) and "heat-resistant" when used above this temperature.
Design Flexibility for Complex Parts
One of the most significant advantages of investment casting is its ability to produce parts with intricate geometries. Internal cavities, undercuts, thin walls, and sophisticated contours are easily achievable. This makes the process ideal for parts that would be difficult—or even impossible—to manufacture with traditional machining or sand casting techniques.
Exceptional Surface Finish
The smooth ceramic mold used in investment casting results in a naturally clean surface finish. Typical parts achieve finishes in the 125 RMS range or better, reducing or eliminating the need for secondary finishing operations.
Tight Dimensional Tolerances
Investment casting achieves outstanding accuracy, often holding tolerances within ±0.005 inches per inch. This precision minimizes the need for costly machining, while also ensuring that parts consistently meet design specifications—critical in regulated industries such as defense and energy.
Material Versatility
Another major advantage is the ability to cast a wide range of alloys. Alcon Industries specializes in pouring stainless steels, cobalt and nickel-based superalloys, aluminum, and specialty metals. This flexibility allows customers to select materials based on performance criteria such as heat resistance, corrosion resistance, wear properties, and mechanical strength.
Reduced Material Waste and Cost Savings
By producing near-net-shape parts, investment casting significantly reduces raw material waste. This is especially important when working with high-cost alloys, where every ounce saved matters. Less waste and minimal machining also lead to lower overall production costs and shorter lead times.
Aerospace
In the aerospace sector, investment casting is used for producing turbine blades, engine components, and other high-precision parts. The ability to handle complex geometries and high-performance materials like titanium makes it ideal for this demanding field.
01
Automotive
Automotive manufacturers utilize investment casting for parts that require durability and precision, such as engine components, transmission parts, and suspension systems. Aluminum investment casting is particularly popular for its lightweight properties.
02
Medical
The medical industry benefits from investment casting for creating precise and reliable components, including surgical instruments, implants, and prosthetics. Stainless steel investment casting is commonly used here due to its biocompatibility and strength.
03
Industrial Machinery
In industrial machinery, investment casting is employed to produce parts like valves, pumps, and fittings that require high durability and accuracy. Precision investment casting ensures these components meet stringent performance standards.
04
Create and Assemble the Wax Patterns
There are three basic routes to delivering the precision wax patterns that are the starting point for investment casting. For decorative items and one-off products such as jewelry or technical items for which precision is a lower priority, it is common to hand carve the wax master to the desired dimensions/shape.
Mount the Wax Patterns
Attach a feeder structure consisting of a sprue and channel to the part to allow the fill to be successful. Attach the part and feeder structure to a casting board that forms the structure to allow the flask (the completed cast tool) to stand securely.
Make a Mold Shell
A first immersion in the correctly formulated slurry will coat the surfaces of the pattern/sprue/support structure. Once the assembly is coated, it can be withdrawn and allowed to drip. Once drained, apply a layer of stucco—dry powder sprinkled all over to stabilize the first layer.
Remove the Wax
Bake the completed and dried flask to remove the wax and fully integrate the refractory coating. The supplier-recommended temperatures and durations for this stage are dependent on the type of material such as: water glass, clay, and silica.
Melt and Cast the Metal
Lift the crucible with tongs and pour the contents into the upper opening to the sprue. Fill/charging should continue until the entire structure is full. This is usually confirmed by the visible presence of molten metal in the upper vents, showing good flow through.
Finalize the Castings
When the cast has cooled, break away the refractory material without distorting the newly cast metal. In some cases, such as for simple and robust castings in stainless steel and bronze, this can be a vigorous and rapid process.
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Material Grade |
Carbon Steel, Stainless Steel, Alloy Steel, Ductile Iron, Aluminum |
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Part Size |
Up to 1,000 mm |
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Part Weight |
0.5 kg – 100 kg |
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Surface Finish |
Shot Blasting, Sand Blasting, Polishing, Painting, Powder Coating |
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Machining Service |
CNC Turning, Milling, Drilling, Tapping, EDM |
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Heat Treatment |
Annealing, Normalizing, Quenching, Tempering |
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Dimensional Tolerance |
ISO 8062 CT4–CT8 or Custom Requirement |
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Surface Roughness |
Ra 3.2 – 12.5 μm |
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Packaging |
Bubble + Carton + Wooden Case |
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Shipping |
We have long-term partnerships with DHL, UPS, FedEx, TNT, and EMS, and can arrange air or sea freight for large orders. |
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.
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