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Metal casting is a manufacturing process in which metal is heated until molten, poured into a pre-prepared mold cavity, and allowed to cool and solidify. The resulting part then undergoes cleaning and post-processing to produce the final metal component. This method enables the efficient production of metal parts with complex geometries and varying sizes, and is compatible with a wide range of materials, including cast iron, aluminum alloys, and copper alloys. It is extensively used in sectors such as machinery, automotive manufacturing, and home appliances. Different casting techniques can be selected to balance costs, precision, and production volume requirements; however, the process necessitates the careful control of casting defects, such as porosity and shrinkage cavities, and some castings may require additional machining or surface treatment to meet specific precision and functional specifications.
This method uses molding sand to create a mold cavity, into which molten metal is poured under the force of gravity. It offers low costs and high flexibility, making it well-suited for large components and large structural parts. As the most widely used casting process, it provides a moderate level of precision.
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Liquid aluminum, zinc and other alloys are injected into metal dies under high pressure and high speed. The parts feature smooth surface and high dimensional accuracy, suitable for mass production of small-batch components such as small home appliance and automotive housings.
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Cavities are formed using wax patterns. The wax melts and drains away at high temperature before molten metal is poured in. This process can produce intricate, fine-featured parts with high dimensional accuracy, widely used for precision hardware and aerospace components.
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Molten metal flows into the metal cavity by its own gravity with no external pressure applied. Parts feature fewer internal pores and good density, suitable for components requiring high sealing performance such as aluminum alloy housings and pump bodies.
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Molten metal is lifted slowly into the mold under low pressure. It delivers stable filling, fewer defects and high material utilization, commonly used for wheel hubs, water tanks and sealed housings.
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Molten metal is pressed against the cavity by centrifugal force generated from high-speed mold rotation. It suits tubular and sleeve-shaped parts with dense microstructure and good wear resistance, widely used for bushings and pipe liners.
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Our production system combines advanced casting technology with rigorous quality control to manufacture precision components that meet demanding performance and reliability requirements.
Fabricate a mold with a cavity matching the reverse profile of the casting part, which defines the final shape of the metal component.
Load metal ingots and recycled scrap into a furnace, heat above melting point to form fluid molten metal, and adjust composition while removing slag and gas.
Degas, deslag and refine the molten metal to reduce internal pores and inclusions, improving density and mechanical properties of castings.
Preheat the mold and set up gates, risers and vents to avoid cold shuts and sticking, providing channels for metal flow and gas escape.
Pour molten metal into the mold cavity steadily by gravity, pressure or centrifugal force to fully fill the cavity.
Air inside the cavity escapes through vents; risers reserve extra molten metal to compensate volume shrinkage during solidification and prevent shrinkage cavities.
The molten metal dissipates heat inside the cavity, changes from liquid to solid, and forms metallic grain structures through ordered atomic crystallization.
Continue heat dissipation until the whole casting cools below its solidus temperature and maintains a fixed solid shape.
Once cooled to proper temperature, break the sand mold or open the metal die to take out the raw casting.
Remove sprues and risers, grind flash and burrs, blast clean surfaces, and perform heat treatment, inspection or machining as required to obtain finished parts.
The choice of casting process directly determines the quality, unit cost, and production lead time of the final part. Drawing on over 15 years of industry experience, we have identified the following key selection criteria to help you quickly determine the most suitable casting solution.
| Item | Sand Casting | Die Casting | Investment Casting | Centrifugal Casting | Low-Pressure Casting |
|---|---|---|---|---|---|
| Part Complexity | Medium to high, suitable for large parts & internal cavities | Medium, good for thin-wall parts; limited deep undercuts | Very high, intricate, thin-wall, irregular shapes | Low, only rotational/axisymmetric parts | Medium, regular thin-walled housings |
| Typical Size | Very small to extra-large | Small & medium-small | Tiny to medium-small | Tubes, sleeves, rings | Medium housings, wheels |
| Wall Thickness | ≥3mm | Al/Zn: 0.5~1.5mm, excellent thin wall | ≥0.5mm, ultra-fine features | Uniform wall, not ultra-thin | 2~5mm, consistent thin wall |
| Surface Finish | Ra 25~100μm Poor | Ra 1.6~6.3μm Good | Ra 1.6~3.2μm Excellent | Rough inner surface, fair outer surface | Ra 3.2~12.5μm Fair |
| Dimensional Tolerance | Low | High | High | Medium | Medium-high |
| Material Options | Almost all cast alloys | Al, Zn, Mg die-cast alloys only | Carbon steel, stainless steel, superalloy, Al, Cu | Cast iron, steel, copper alloy | Mainly aluminum alloy |
| Unit Cost for Mass Production | Low cost for low volume; moderate for mass | Excellent for high volume; high mold cost | Higher cost, for high-value parts | Cost-effective for tube/ring mass | Moderate for medium batch |
| Tooling Investment | Low (wood/plastic pattern) | High, hardened steel dies | Moderate wax tooling | Low to moderate simple molds | Moderate-high metal molds |
| Typical Applications | Pump housing, valve, frame, large enclosures | Connector housing, heat sink, auto & home appliance parts | Turbine blades, valve parts, precision hardware, medical components | Pipe, bushing, roller, copper ring | Auto wheels, cylinder heads, energy storage housings |
| Key Advantages | Flexible, unlimited size, fast pattern change | Fast cycle, high efficiency, good surface, automation friendly | Cast hard-to-machine alloys, ultra-fine details | Dense grain, low shrinkage porosity | Low porosity, stable filling, good density |
| Limitations | Rough surface, large machining allowance | Limited alloy range, porosity risk, heat treatment restriction | Long lead time, high piece price | Only axisymmetric rotary parts | Slow cycle, limited complex shapes |
Metal casting is a widely used manufacturing process that pours molten metal into a mould cavity to form near-net-shape parts. It supports diverse metal materials and flexible part geometries, which makes it popular across automotive, electronics and machinery industries.
It can produce complex shapes with internal cavities, curved profiles and intricate features that are difficult or costly to make by machining.
A large range of metals and alloys can be cast, including aluminium, brass, cast iron, stainless steel and high-temperature alloys to meet different performance requirements.
It works well for one-off prototypes, small-batch custom parts as well as mass production, with adjustable tooling cost according to order volume.
Metal casting is a foundational manufacturing method to create metal components, and its finished castings are extensively adopted in many industrial sectors for structural, functional and high-temperature load-bearing parts.
Casting produces critical auto parts such as engine blocks, cylinder heads and suspension brackets, which need good strength and vibration resistance under working conditions.
Aluminum and brass castings are used for connector housings, heat sinks and power accessories, offering reliable electrical conductivity and heat dissipation performance.
Pump bodies, valve bodies and gear housings are commonly made by casting, suitable for withstanding pressure and stable operation in fluid transmission systems.
Precision investment casting delivers near-net-shape metal components with outstanding dimensional accuracy and fine surface quality, ideal for complex parts that demand tight tolerances across industrial applications.
We produce intricate, thin-wall and undercut parts that are difficult to machine, using wax patterns to replicate delicate features precisely.
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A wide selection of alloys is available, including stainless steel, carbon steel, copper alloys and superalloys, to satisfy strength, corrosion or heat-resistance requirements.
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Value-added services such as machining, surface finishing, heat treatment and non-destructive testing are provided to supply ready-to-use finished components.
Get QuoteInvestment casting specifications define standardized requirements for wax pattern making, shell building, melting, pouring, post-treatment and inspection. They ensure consistent dimensional accuracy, surface quality, mechanical properties and traceability of castings.
| Item | Specification Description |
|---|---|
| Wax Pattern | Wax patterns shall be free of cracks, deformations and surface blemishes; dimension check is performed before shell coating. |
| Ceramic Shell | The ceramic shell must have sufficient strength and permeability, with controlled drying time to avoid shell cracking during dewaxing. |
| Melting & Pouring | Melting temperature, holding time and pouring speed shall follow alloy standards to reduce gas porosity and inclusions. |
| Dimensional Tolerance | Dimensional accuracy complies with ISO 8062, and critical features are inspected with CMM or gauges. |
| Surface Quality | Surface finish and defects such as cold shut, slag inclusion and pinhole porosity are checked per agreed acceptance criteria. |
| Material & Mechanical Test | Chemical composition and mechanical properties (tensile strength, hardness) are verified by lab test reports. |
| NDT Inspection | Non-destructive tests including PT, UT or X-ray are available for critical castings upon customer request. |
Precision investment casting for high-performance applications manufactures high-integrity metal components that withstand extreme stress, temperature, corrosion and fatigue loads. These near-net-shape parts meet strict engineering specifications for safety-critical and demanding operating environments.
Turbine blades, nozzles and structural fittings are cast from superalloys, maintaining stable mechanical performance under high temperature and high pressure in jet engines.
Steam turbine parts, gas turbine vanes and boiler fittings are produced to resist thermal cycling and oxidation for reliable long-term power plant operation.
Biocompatible stainless steel and cobalt-chrome castings are used for orthopedic implants and surgical tools, meeting strict biocompatibility and cleanliness standards.
Valve trims, flow control bodies and connector components made of corrosion-resistant alloys endure high pressure and aggressive chemical media in well systems.
High-strength brackets, turbo housings and exhaust components offer lightweight performance and fatigue resistance for racing engines and high-performance vehicles.
High-reliability structural parts and ammunition components deliver consistent strength and impact resistance under harsh field and combat conditions.
It achieves tight tolerances and smooth surfaces, greatly reducing or eliminating subsequent machining work.
Undercuts, thin walls and intricate internal features can be formed which are not feasible with many other casting methods.
It supports hard-to-machine alloys including stainless steel, superalloys, cobalt-chrome and heat-resistant materials.
Controlled melting and pouring minimize large defects, producing sound castings suitable for high-performance critical applications.
Multiple steps including wax pattern, shell making and slow drying extend the whole manufacturing cycle.
Labour-intensive shell process and consumable ceramic shells make it more expensive than sand casting or die casting.
It is not economical for very large castings; it is mainly suitable for small and medium-sized components.
Improper shell strength or dewaxing control may cause shell cracking, sand inclusions and surface blemishes on castings.
Die casting is a high-volume metal forming process that injects molten non-ferrous alloy under high pressure and high speed into a hardened steel die cavity. The molten metal solidifies rapidly inside the mold to produce near-net-shape parts with good dimensional consistency and smooth surface finish. It is widely used for aluminum, zinc and magnesium alloy components in automotive, electronics and home appliance industries, featuring fast cycle time and excellent suitability for mass production.
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Our online die casting service provides custom precision non-ferrous alloy parts. From design review to finished components, we offer streamlined one-stop support tailored to your mass-production requirements.
We evaluate your drawings and offer DFM feedback to optimize part structure, avoid casting defects and reduce tooling risks before mold fabrication.
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Molten aluminum, zinc or magnesium alloy is injected under high pressure into hardened steel dies to produce parts with tight tolerances and smooth surface quality.
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We provide follow-up processes including CNC machining, deburring, polishing, powder coating and plating to deliver ready-to-assemble components.
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We support prototype sampling and stable high-volume manufacturing, with transparent order progress tracking for your online project.
Get QuoteDie casting molds are crafted from high-quality hardened steel, designed to withstand extreme temperatures and pressures. Castings are primarily produced from non-ferrous alloys, selected for their excellent fluidity, low melting points, and corrosion resistance. Ferrous alloys are utilized for specialized, high-wear applications. The standard grades we support are listed below. Custom alloys are also available upon request.
Features excellent high-temperature strength and toughness. It offers resistance to heat checking and maintains its hardness even during prolonged exposure to high temperatures. It is an ideal choice for aluminum and magnesium die-casting molds that require high durability and precision.
Note: Selecting the optimal die-casting material, based on the specific application, geometry, environment, and budget, is crucial. Please contact our engineers for data-driven solutions.
We deliver one-stop precision machining solutions for die-cast parts. With optimized machining strategy, we achieve tight dimensional tolerances and complex features, helping you cut cycle time and control cost for finished ready-to-assemble components.
We implement rigorous, end-to-end quality controls across the entire die casting process to maintain stable dimensions, surface quality and material properties, ensuring uniform, reliable castings for your high-volume projects.
Incoming alloy raw material inspection to verify chemical composition and purity.
Professional DFM review and mold trial validation prior to mass production.
Closed-loop monitoring of key casting parameters: temperature, pressure and cycle.
Regular preventive maintenance and wear inspection of dies and tooling.
First article inspection (FAI) for every new batch before full production run.
Continuous in-line sampling, visual check and dimensional gauge inspection.
Post-process verification including deburring, coating and CNC machining quality check.
Final release inspection with CMM measurement and performance testing before shipment.
Our engineering team provides in-depth Design for Manufacturing (DFM) analysis and delivers competitive quotes well in advance. This ensures that your parts are optimized for cost, performance, and production efficiency before work begins, guaranteeing quality and accelerating your project timeline.
Accelerate your product development by choosing a manufacturing partner known for precision, flexibility, and reliability.
Get a quote nowSand casting forms metal parts using sand moulds, suitable for complex, large and low-to-medium volume castings.
Fine sand mixed with binder is packed around a pattern to form a mould cavity.
The pattern is removed carefully to leave a hollow cavity matching the target part shape.
Gating and riser channels are built for molten metal feeding and shrinkage compensation.
Liquid metal is poured into the mould cavity through the gating system under gravity.
The molten metal cools and solidifies gradually inside the sand mould.
Sand mould is broken apart to take out the finished casting for cleaning and finishing.
At Tianrui Electronics, quality control runs through every stage of sand casting, from pattern making, moulding, pouring to final casting inspection. Supported by ISO 9001 systems, we deliver robust and reliable castings that meet strict requirements for automotive, industrial and heavy machinery applications.
We deploy high-precision testing equipment for full quality verification. Optical spectrometers analyse molten metal composition, CMMs check complex geometries, and ultrasonic testing detects internal hidden defects to guarantee casting integrity.
Every production batch undergoes strict validation, including spectrometric material certification, mechanical property tests (tensile strength, hardness), dimensional stability checks and leak tests to ensure stable performance under working conditions.
We use mould flow simulation and solidification control to stabilise casting quality, achieving a high first article inspection pass rate. Root cause analysis and corrective actions are triggered promptly for non-conformities to minimise delays for your projects.
