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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Tolerances |
Available on Request |
Types of Shell Mold Castings
The shell mold castings produced by our company mainly include the following types:
Ductile Cast Iron Resin Coated Sand Castings
Ductile Cast Iron Resin Coated Sand Castings are high-precision components made by pouring molten ductile iron (nodular cast iron) into molds created from sand bonded with synthetic resin, commonly known as shell mold casting.
Steel Coated Sand Shell Moulding Casting Parts
Steel Coated Sand Shell Moulding Casting Parts are precise metal components produced by pouring molten steel into thin, hardened molds made of silica sand coated with phenolic resin.
Grey Iron Shell Casting Components
TGrey Iron Shell Casting Components are engineering parts made from a graphite-flake-containing iron alloy, produced via a high-precision shell mold casting process.
High Precision
The thin-walled molds allow for exceptional dimensional accuracy, with tighter tolerances than conventional sand casting. This is essential for components like gear housings, cylinder heads, and connecting rods, where precise dimensions are crucial for functionality.
Excellent Surface Finish
The smooth interior surface of the resin-coated mold results in superior surface quality, reducing the need for extensive post-casting machining. This improves productivity and lowers production costs.
Cost Efficiency
Despite using expendable molds, shell casting is cost-effective due to the ability to produce consistent, high-quality parts with minimal waste. The rapid mold preparation and shorter production cycles further enhance manufacturing efficiency.
Capability for Complex Geometries
Shell Mold Casting is well-suited for intricate and complex designs that are challenging to achieve with other casting methods. Internal cavities, sharp edges, and detailed surface textures can be accurately reproduced.
Material Versatility
The process accommodates a wide range of metals, including ferrous and non-ferrous alloys. This flexibility allows engineers to select materials based on mechanical requirements, corrosion resistance, or thermal properties.
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Industry |
Applications |
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Automotive |
Engine blocks, cylinder heads, camshafts, crankshafts, transmission housings |
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Aerospace |
Turbine blades, gear housings |
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Industrial Machinery |
Gears, valves, pump housings, lever arms |
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Electrical Equipment |
Housings and components for electrical systems |
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Oil and Gas |
Valve bodies, Custom precision components |
Create All the Pattern Parts
The first step in shell molding is creating a pattern part. This is achieved by first machining a metal pattern tool, typically made from iron or steel, in the shape of the desired part. Usually, each pattern represents one-half of the part; a second pattern is required for the other half.
Construct the Mold
Molds can be repeatedly made from a single pattern. Lubricate the pattern with calcium stearate, then preheat it to 175-370 ºC. Next, place the pattern on top of a “dump box” filled with the sand and resin mixture.
Assemble All the Pattern Parts
After the shell has cooled, it can be ejected from the pattern tool and assembled with the other half of the shell in a flask. The flask is filled with a metal shot that fills in the space between the two-part shell and the flask’s walls. Mold halves must be clamped tightly together.
Expose the Pattern to Molten Metal
Molten metal is then poured into the assembled shell mold, either manually or with automated pouring equipment. Shell molding is suitable for a wide range of metals, including cast iron, carbon steel, stainless steel, and nonferrous alloys.
Allow To Cool
After pouring, the casting is allowed to cool naturally in ambient air. Active cooling or quenching is generally avoided, as it can cause internal stresses or undesirable microstructural changes. Cooling time depends on the casting’s geometry, size, and the type of metal used.
Eject the Casting
Once the metal has cooled, it is ejected from the casting. This can be achieved by separating the mold halves along their seam or by breaking the mold. The mold material is easier to remove from the metal if it is properly lubricated before the molten metal is introduced.
Inquiry & Quotation
01
Confirming Details / Cost Reduction Proposals
02
Tooling Development
03
Trial Casting
04
Samples Approval
05
Trial Order
06
Mass Production
07
Continuous Order Proceeding
08
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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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