Sand casting is one of the oldest and most widely used metal casting processes, ideal for producing both simple and complex geometries at a cost-effective price. By using green sand or dry sand to create molds, this process is highly versatile and particularly suited for small to medium production runs with flexible design modifications.
At SAIVS Foundry, we specialize in several types of sand casting processes, including:
Among these, shell molding offers superior surface finish and dimensional accuracy, making it ideal for high-precision parts.
Our state-of-the-art foundry combines automated molding lines with manual operations, allowing us to accommodate a wide range of customer requirements. We are capable of pouring:
With a focus on quality, consistency, and customer satisfaction, SAIVS has become a trusted global supplier of complex, high-precision, and mission-critical cast metal components. Whether you need prototype development or large-scale production, our flexible sand casting capabilities ensure fast turnaround and competitive pricing.
Sand casting is a metal forming process in which a mold is first formed from a three-dimensional pattern of sand, and molten metal is poured into the mold cavity for solidification. The sand shell is subsequently removed after the metal components cooled and formed. Certain sand casting components require a secondary machining process after casting. Sand casting can process a wide range of metals and alloys, including iron, special alloy steel, titanium alloy, and others. Sand casting is a cost-effective and efficient technology, which is generally flexible with regards to size and change of geometry design. Secondary machining is usually needed to improve product accuracy.
Grey Cast Iron: EN-GJL-100, EN-GJL-150, EN-GJL-200, EN-GJL-250, EN-GJL-300, EN-GJL-350 or Their Equivalent Grades Ductile (Nodular) Cast Iron: EN-GJS-400-18, EN-GJS-40-15, EN-GJS-450-10, EN-GJS-500-7, EN-GJS-600-3, EN-GJS-700-2, EN-GJS-800-2 or Their Equivalent Grades Cast Aluminium and Their Alloys Cast Steel or other materials and standards on request
Capabilities of Sand Casting moulded by hand: Max Size of Casting Molds: 1,500 mm × 1000 mm × 500 mm Weight Range of Sand Castings: 0.5 kg - 500 kg Annual Capacity of Sand Castings: 5,000 tons - 6,000 tons Casting Tolerances: On Request or According to ISO 8062 Capabilities of Sand Casting by Automatic Molding Machines: Max Size of Casting Molds: 1,000 mm × 800 mm × 500 mm Weight Range of Sand Castings: 0.5 kg - 500 kg Annual Capacity of Sand Castings: 8,000 tons - 10,000 tons Casting Tolerances: On Request or According to ISO 8062
SAIVS is a leading Sand casting foundry in China of top-quality Investment Castings committed to delivering excellent quality, superior value and exceptional customer experience. SAIVS has the experience, technical expertise and quality assurance processes to consistently and reliably deliver an extensive range of precision castings with further processing.
Spectrographic and manual quantitative analysis Metallographic analysis Brinell, Rockwell and Vickers hardness inspection Mechanical property analysis Low and normal temperature impact testing Cleanliness inspection UT, MT and RT inspection APQP PPAP FMEA quality control programs
Sand casting is a versatile and widely used metalworking technique for producing complex metal parts. It's an efficient and cost-effective method, especially for large components or high-volume production. Unlike other casting methods, sand casting uses a unique, non-permanent mold made from sand.
Here is a detailed breakdown of the key steps in the modern sand casting process:
The process begins with creating a pattern, which is a replica of the final part. Patterns can be made from a variety of materials, including wood, plastic (resin), or metal (aluminum). The choice of material depends on factors such as production volume, required dimensional tolerance, and surface finish. For example:
Wood patterns are inexpensive and suitable for low-volume production.
Resin patterns offer better durability and are a good choice for moderate production runs.
Aluminum patterns are the most durable and precise, making them ideal for high-volume production where thousands of castings are required.
Next, the pattern is used to create a mold. In a process often referred to as "hard mold casting" or "self-hardening sand molding," a specialized resin sand is mixed and packed around the pattern in a container called a flask. The sand is compacted by machines to ensure it fills all the intricate details of the pattern and creates a solid, stable mold. This sand mixture is designed to harden on its own, forming a strong, durable mold without the need for external heat.
For parts with internal features or hollow sections, a core is used. The core is a pre-formed sand insert that is placed inside the mold cavity before pouring. Like the mold, the core is also made from a self-hardening sand mixture and is designed to create the negative space of the part's internal geometry.
Once the mold is complete and the core is in place, the metal is ready to be melted. Foundries typically use medium-frequency electrical furnaces to melt a variety of metals, including iron, steel, and aluminum. The molten metal is then poured into the cavity of the self-hardening sand mold through a system of gates and runners, filling the entire space and surrounding the core.
After the molten metal has filled the mold, it is left to cool and solidify. Once the metal has completely solidified, the casting is removed from the sand mold. This process, known as "shakeout," involves breaking away the sand mold to retrieve the rough casting. The self-hardening sand is often collected and recycled for future use.
The rough casting is then taken to a finishing area.
Sand Blasting: A shot blasting process removes any residual sand or oxides from the surface of the casting.
Fettling: Workers cut off the gating system (the channels that allowed the metal to flow into the mold) and grind down any excess material at the parting lines or gate locations.
Secondary Processes: If the final product requires a higher level of precision or a specific surface finish, the casting may undergo additional treatments like machining or surface coatings.
The end result is a completed, high-quality casting ready for use.
pistons and valves Blowers/impellers Cams, bushing, and bearings Electronic equipment Engine blocks bearings blowers & impellers electronic equipment gears machine parts Mining Machine Parts pump bodies, pistons screw nuts trailer parts truck chassis parts valves water jackets & crankcases Automobile parts Screws, nuts, and gears Agricultural machines Medical equipment
Value Added Services
Heat treatment: Quenching, Tempering, Normalizing, Annealing, Carburization, Nitration Surface treatment: Anodizing, Zinc-plating, Polising, GeoMet, Zintek, Electrophoresis....etc Testing Service: Chemical Composition, Mechanical Properties, Fluorescent or Magnetic Penetration Inspections (FPI, MPI), X-rays, Ultrasonic Testing, Dynamic and Static Balancing Testing
OEM/ODM Service
OEM/ODM service are welcomed, we have great advantage in R&D, assembly of mechanical components, we have more than 10 engineers and technicians, with many years of experience in working with our customers worldwide for designing and testing, we are view as a reliable partner due to the level of experience and expertise offered in the development, design and commercial support for our customers’ products. Any formats of Stp, Step, Igs, Xt, AutoCAD(DXF, DWG), PDF drawing are welcomed
Contact SAIVS For Sand Casting Services
SAIVS is the top custom Sand Casting manufacturer in China. We can supply all kinds of different Sand Casting parts in steel, iron, aluminum, etc.You can send your detail RFQ and drawings to us via e-mail.
CONTACT
NO. 626 Yuncai Road, Yunlong Town, Yinzhou, Ningbo, Zhejiang, China. Tel: +86-574-88188161 Fax: +86-574-8834 5368 Email: seo1@saivs.com Phone: +8613905748980
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