Sand Casting Parts
China Sand Casting Parts Manufacturers Factory Suppliers
We specialize in producing all kinds of Sand Casting Parts products, mainly Resin Sand Casting Parts, Expendable Pattern Casting, Coated Sand Casting Parts, High Tensile Strength Castings, Heat Resistant Steel Castings, Heavyduty Mining Teeth, Mining Machinery Wear Parts, Bucket Lip Protectors, Bucket Wing Shrouds, Cast End Bits, Mining Machinery Wear Plate, etc.
HANRUI STEEL CUSTOMIZATION was established in 2009, boasting over 10 years of manufacturing experience, can provide customers with perfect solutions.
Our market is mainly concentrated in countries such as the United States, Australia, Canada, Finland, Belgium, Bulgaria, Germany, Japan, United Kingdom, Netherlands, Sweden, etc. We have established long-term cooperative relationships with customers around the world.
Company Advantages
Well-Experienced
HANRUI STEEL CUSTOMIZATION was established in 2009, boasting over 10 years of manufacturing experience. With a dedicated team casting engineers, and mechanical designers, we are committed to offering solutions to the steel accessory challenges faced across various industries.
Large Scale
With shares in two investment casting bases, one sand casting base, and two forging bases, we offer comprehensive one-stop services to our customers. From initial design and development to the delivery of flawless steel parts, we ensure a seamless and efficient process.
Advanced Production Equipment
We are a full-service company providing complete design, R&D, production and sales services. Our production workshop is equipped with the most advanced equipment. Innovation, powerful technology, and expertise make our equipment highly automated with various parameters that can be adjusted to meet the needs of most applications in the industry.
24-hour Online Customer Service
We have an experienced and professional customer support team to provide flexible service to customers around the world. Our customer service is available online 24 hours a day. After receiving the service information or feedback from the customer, we will reply and address the feedback in the shortest time.
Global Sales Network
Our market is mainly concentrated in countries such as the United States, Australia, Canada, Finland, Belgium, Bulgaria, Germany, Japan, United Kingdom, Netherlands, Sweden, etc. We have established long-term cooperative relationships with customers around the world. In addition, we also provide OEM/ODM manufacturing services to many customers.
Customized Services
We welcome product customization, and our team is capable of developing new products or providing technical solutions tailored to customer requirements. lf you have any special request, pls send us the details.
Introduction to Sand Casting Parts
Sand casting is a manufacturing process in which molten metal is poured into a sand mold containing a hollow cavity of the desired shape. After a period of time, the casting cools and solidifies. The sand is then broken away and shaken out. Casting materials for sand casting include metal, concrete, epoxy, plaster, and clay.
Parts manufactured using sand casting come in a wide range of sizes and weights and have complex geometries using a variety of metals. The use of sand as the casting material significantly reduces the cost of the casting process. In the metal mold process, the machining of the molds accounts for a large portion of the costs.
With sand casting, the type of sand used in the process depends on whether the sand will be reused or disposed of. In green sand sand casting, the molds are reusable while in the dry sand casting process, the sand is thrown away.
Sand casting is used for metals with high melting temperatures, such as titanium, steels, and nickel and is the only casting process that can work with those materials. It is the choice of the aerospace and automotive industries for producing low cost, small series parts.
Advantages of Sand Casting Parts
The advantages of sand casting include:
It is used to form complex shapes
It can produce very large parts
Very low cost for tooling
Recycle scrap
It is versatile and applicable to all metals, including high melting point ones.
Easy to scale
Complex geometries with thin-wall sections
Low production cost
Complex geometries with thin-wall sections
Types of Sand Casting
Resin Sand Casting Parts
Resin sand casting is a metal casting process that uses a mixture of resin and sand to create molds. The resin acts as a bonding agent, mixing with a catalyst to produce a sand mold. The mixture hardens through a chemical reaction, creating solid, hard, and strong molds.
Resin sand casting can produce accurate results with increased surface strength. It can also help reduce defects like sand holes, air holes, and shrinkage.
The raw materials for resin sand casting include: Sand, Furan resin, Solidification agent, Annexing agent.
Expendable Pattern Casting
Expendable pattern casting is a manufacturing technique that uses a low melting point material to create a pattern, and then builds a mold around it. The pattern is then melted or burned out when metal is poured in, and the mold must be destroyed to retrieve the casting.
Expendable pattern casting uses dry sand to mold and duplicate a prototype. It produces castings with high precision geometry, and a surface finish close to precision casting.
Coated Sand Casting Parts
Coated sand casting is a casting method that uses chemical components added to molding sand. The sand is then hardened by heating.
Coated sand has many merits, such as strength and liquidity. It is mixed with new sand and recycled sand, and creates high-quality products.
Applications of Sand Casting Parts
Sand casting can make metal parts for every size – from small to large pieces. The dimensional accuracy and low cost benefits make sand casting a great solution for a range of products and assemblies.
In addition, sand moulding can form castings with excellent exterior and inner cores. Almost anything that is metal is possible for sand casting. Hollows can be made from moist sand containing molten metal, then cooled.
Below are a few products that are typically produced using the sand casting manufacturing process: Axles, Engine blocks, Exhaust manifolds, Gearboxes, Impeller housing , Pistons, Pumps, Turbine housings.
Process of Sand Casting
When sand casting, several steps are followed which include:
Producing the Pattern – Desired Product
A reusable pattern with the same details as the desired completed product is used in the process. A pattern is always made larger than the final part to give an allowance for thermal contraction or shrink. Shrinkage allowance will account for the contractions that occur as a casting cools to room temperature.
Pattern Creation – Gates and Risers: Metal Delivery System
The metal channels that will feed the required cast product design with proper gating and risers are also included in the pattern. This regulates the metal flow and requires gas venting while driving the unavoidable thermal contraction to acceptable places (other than the actual desired finished product).
Depending on the volume and tolerance required, patterns are manufactured of a variety of materials, including wood, metal, synthetics, expandable polystyrene (EPS), and others. In other circumstances, such as pipe fittings, the component's interior must be hollow. In such circumstances, extra patterns known as cores must be created.
Core Making
Cores are a separate portion of the mold that prevents the liquified material from filling in any gaps. They're utilized to make interior cavities and other things that the mold can't produce. A core box is the tooling used to build the core, which is just another name for the mold that makes the core.
Creating the Mold
Around the design, a refractory substance that is stable at high temperatures (in our case, sand) is created. The material must be strong enough to support the weight of the liquid metal during casting. It should also be resistant to metal reaction but fragile enough to be separated after cooling of the casting.
Pouring the Metal into the Mold
Molten metal is injected into the static mold directly. It defines the finished portion and the risers by filling the void. A continuous liquid metal supply comes from the risers to the casting. Because they are meant to cool and solidify last, the shrinkage and potential void are concentrated in the riser rather than the targeted section.
Liquid metal can thus flow into the casting smoothly with less turbulence. Reduced turbulence can aid in the prevention of oxide formation and casting flaws. This method can be used to make almost any alloy. Almost any alloy can be made using this method. For extremely reactive materials to oxygen, an argon shielding process can be used to keep air away from the molten metal.
Shakeout Operation
The casting hardens and cools, containing both the desired item and the additional metal required to manufacture it. In a shakeout operation, the sand is split up. The sand used to make the mold is recovered, reconditioned, and reused in large quantities.
Casting Final Operations
The gates, runners, and risers are cut from the casting, and final post-processing such as sandblasting, grinding, and other methods are used if necessary to finish the casting dimensionally. To achieve final dimensions or tolerances, sand castings may require extra machining.
Heat treatment can be used to improve the dimensional stability or characteristics of parts. Non-destructive testing is another option. Fluorescent penetrant, magnetic particle, radiographic, and other inspections are examples. Prior to shipment, final dimensional inspections, alloy test results, and NDT are validated.
Types of Sand Used for Sand Casting
Several types of sand methods and materials are commonly used and are listed below:
Dry Sand
Dry sand is a specific type of molding sand that uses clay (either kaolinite or bentonite) with very little water as a binding agent. This binder creates a mold that retains its pattern-rammed shape and withstands the pouring of molten metal without collapsing or causing defects in the casting. A major advantage of this approach is that there is less steam in the fill process that can otherwise fracture and destabilize the sand construct, or disrupt the pour.
Resin Sand
Resin sand, also referred to as resin-coated sand or furan sand, is a type of molding sand used in sand casting processes. Furan refers to the use of furfuryl alcohol resin. It is a mixture of silica sand or other aggregate materials and a synthetic resin binder that bonds sand grains into a coherent mass, creating a stable and robust mold for casting metal parts.
Using resin-coated sand in sand casting offers several advantages over traditional green sand or dry sand processes. Resin-sand molds are stronger and have better dimensional stability compared to green-sand molds, resulting in more accurate and consistent castings. The cure duration for furan-sand molds is shorter than the drying time required for green-sand molds. Furan-sand molds often result in castings with smoother and cleaner surface finishes due to reduced mold surface defects. Resin-sand molds are less prone to deformation or mold collapse during metal pouring, leading to higher productivity through fewer failures, low or zero steam defects, or reduced need for post-casting fettle.
Sodium Silicate or Water Glass
Sodium silicate or water glass casting is a specialized sand casting process that exploits a sodium silicate binder to integrate the sand for mold formation. The mold is formed in the traditional way and is dried and cured to create a more precise structure than green-sand casts. This technique is traditionally preferred for more intricate and delicate patterns, but may well be performance and cost surpassed by furan-sand casting.
These molds are less resilient in use and handling than some other methods. Sodium silicate casting is still widely used, for benefits such as: good dimensional stability, low cost, shorter curing time compared to green-sand molds, and lower moisture content at fill than green-sand casting.
Green Sand
Green-sand (or greensand) casting is a widely used process for manufacturing metal parts. The green appearance of the sand is due to the presence of moisture, bentonite clay, and sea coal. Sea coal is powdered bituminous coal that coincidentally washes up on beaches and is "naturally" present in beach sand as the first casting medium. This cast-making process offers a poorer surface finish and lesser precision/repeatability than more modern processes using less volatile and fragile binders.
Nonetheless, green-sand casting offers various advantages that keep it in heavy use, such as: suitability for producing the widest range of part sizes and complexities, simplicity, minimal tooling requirement, and the sand can be reused.
To avoid shrinkage and prevent stress concentration, each intersecting point must be filleted.
The gating system must be designed appropriately for the proper transfer of molten metal into the mould cavities.
The parting line should be horizontally flat and positioned as low as possible.
Machining allowance should be kept in mind while casting that is normally in the range of 1.5 mm to 6 mm.
The draft angle is normally taken between 3° to 5°.
The minimum section thickness is typically 5 mm (about 0.2 in) for light nonferrous alloys and 6 mm for ferrous alloy.
The cast object’s weight may range from 0.5 to 20,000 kg (about 44092.4 lb) with a minimum run weight of 300 kg (about 661.39 lb).
Our Factory
We have a fully automatic CNC production line, and are committed to providing customers with the best products and services.
Frequently Asked Questions
Q: What are the components of Sand Casting Mold?
Base Sand: The base sand is the sand that is utilized to create the mold in its purest form. A binding agent is necessary to keep it together. The core is also made of base sand.
Binders or Binding Agents: The binding agents are the glue that holds the sand particles together.
Improvement Through Additives: Additives are used to improve the mold surface finish, its strength, refractoriness, and cushioning.
Parting Compounds: This can be a fine powder or liquid used to facilitate pattern removal from the mold.
Q: How Does Sand Casting Differ From Other Types of Casting?
Q: What Is the Primary Purpose of Sand Casting?
Q: What Is the Importance of Sand Casting in Manufacturing?
Q: What Are the Industries That Use Sand Casting?
Q: What are the disadvantages of Sand Casting?
Low material strength - When compared to a machined item, the material strength is low because of the excessive porosity.
Low dimensional precision - Dimensional accuracy is particularly poor when shrinking and finishing the surface.
Internal sand mold wall surface roughness results in poor surface finishes.
Flaws are unavoidable - Defects or quality differences, such as shrinkage, porosity, pouring metal defects, and surface defects, are inherent in any metallurgical process. When compared to other casting methods like die casting and investment casting, sand casts have a high level of porosity.
Post-processing — if a tighter tolerance is necessary to interface with other mating parts, a further machining operation is frequently required. In comparison to tooling and material costs, processing costs are significant.
Q: How Long Does the Process of Sand Casting Take?
Q: What Are the Types of Metals Used in Sand Casting?
Q: Can Steel Be Used for Sand Casting?
Q: Can Iron Be Used for Sand Casting?
Q: Can Titanium Be Used for Sand Casting?
Q: What's the Difference Between Die Casting and Sand Casting?
Die casting also relies on liquid metal or molten metal. Instead of forming a mold cavity in the sand, a steel mold is created in the size and shape of the product; this mold is also referred to as the "die." The molten metal is forced into the die. After the metal cools and solidifies, the die may be reused, which allows for a quicker cycle compared to casting with sand.
Possible defects include pores, hot tearing, and surface projections. These defects are often caused by issues with the manufacturing processes. For example, porosity often occurs when the liquid metal is heated too high or the sand has a low permeability.
Raw castings may also require additional finishing. The surface finish often has a rough texture and with die casting, the finish is smoother. The die also allows for more complex shapes for parts with tight tolerances.
Sand casting is a low cost casting solution especially for low-volume runs. When creating thousands of castings, cost-effectiveness tends to decrease. With die casting, the reusable mold allows for faster production and lower costs, especially when dealing with high-volume orders.
Q: What's the Difference Between Sand Casting and Investment Casting?
Surface Finish: Investment casting typically has a higher quality surface finish in comparison to sand castings. This is because the sand mold in sand casting can produce a more textured surface finish on the final product. Although, the surface finish created by sand casting can be adjusted via secondary machining methods.
Dimensional Accuracy: Sand casting generally doesn't offer high dimensional accuracy compared to some other casting methods. It's known for its versatility and cost-effectiveness rather than precision. For tighter tolerances and higher precision, processes like investment casting or die casting are often preferred.
The Molds: If you anticipate any changes to the design of the mold, then sand casting is right for you. Sand casting molds are much easier to adjust than the molds used in the investment casting process.
Q: What is sand casting mainly used for?
Q: Is sand casting expensive?
Q: How Durable Are Sand Casting Products?
Q: What Is the Life Span of Sand Casting Products?