What is Resin Sand Casting?

Apr. 20, 2022

What is the process of resin sand casting? 

Resin sand casting is a molding process. This method uses furan resin as a bonding agent and mixes with Catalyst in a suitable proportion to produce sand mold. resin sand casting is a no-bake sand mold process, which resin plays a role as a bonding agent. This molding technique maintains pretty excellently in casting good quality and smooth surface finish. Whereas some limitations are high cost and high raw material

Concerning this technique, the sand mold is self-hardened. It can concrete at the room temperature.

 What is Resin Sand Casting?

Resin sand casting technology uses high-precise mechanical processing machines which are synchronous and automatic lines to make molds for the castings.

As other mold casing methods, the pattern is designed at the beginning of the furan resin sand casting process. The materials of a pattern can vary from wooden, plastics to aluminum. In which aluminum is the most expensive material however it can guarantee the surface quality of the product.

After the pattern-making step, the resin sand is mixed by sand treatment equipment and loads into the flask which contains the pattern. The sand is pressed and make as solid as possible by the worker.

After that, the sand mold will be covered a type of alcohol-based coating and burn out until it is solid. As a result, a hard mold will be created. 

Next, the molten metal is poured into the mold. When the casting is solid, it is removed from the mold and goes through the sandblasting process to clean the remaining sand.

Finally, roughcasting is completed. If it needs any further machining, then these rough castings will be taken other additional processes.

Advantage of resin sand casting

Resin sand casting has unique advantages in comparison with other mold casting methods.

1. Firstly furan technique is excellent by producing castings with smooth surface and good appearance.

2. High precise and fewer defects.

3. The sand mold is dried under the temperature, so it saves time and labor for production.

Disadvantage of resin sand casting?

Although maintaining excellent advantages, this method also remains some limitations.

1. Resin sand casting applies high technologies and advance lines into production so the manufacturing cost is expensive. Hence the price per product is higher in comparison with other methods.

2. It has high requirement for the raw materials.

3. Another weakness of resin sand casting is that it cannot apply to produce steel casting due to its poor gas permeability. 

4. It creates concerns about the environmental issues.

Application of resin sand casting

Resin sand casting is applied commonly in foundries to cast complex products, or big size products.

Furan molding is suitable for casting cast iron, ductile iron, steel, steel alloy, etc. from medium size to large size.

The raw material used in resin sand casting

The raw material of this method includes sand, furan resin, solidification agent, and annexing agent.

Regarding to the sand requirement, the content of SiO2 should be high, the content of mud and the value of acid should be low.

With respect to the furan resin, it is considered few or without nitrogen based on the technique demand and the structures of the metal castings.

About solidification agent, generally, we should use organic sulfuric acid solution.

Finally, adding some annexing agents can improve the property furan resin self-hardening sand; increase the intensity of resin sand.

What is furan resin?

In resin sand casting technology, furan resin plays the most important role as the binder for sand casting.

Furan resin is a polymer compound with the ingredients: 75% Furfuryl alcohol + 11% Formaldehyde + 9% Ure + 5% Water.The ratio of the two components of Formaldehyde and Ure will affect the solid time and durability of Furan mixtures. Whereas, Furfurylalcohol will affect the heat-resistant properties of the mixture.

For many years, Zen Young Foundry has been providing customized metal casting services for various industries and project types.

Six Industries Where We Can Provide Customized Services:

Pump & Valve Parts

Compressor Parts

Train & Railway Parts

Cylinder & Gear Box

Mining & Engineering Machinery Casting Parts

Auto & Aerospace Parts

If you are looking for a solution that fits your custom metal Sand casting project, Zen Young can help you produce perfect metal parts through a reliable casting process.

We always welcome special material and difficult parts and would like to help our comstomers utmost.

The Types of Casting Processes:

Sand casting

The material used to make molds for sand casting is sand, not ceramics. Due to the roughness of sand, sand casting is most commonly used for large castings, which usually require less detail precision and tolerances.

Shell mold casting

Shell mold casting is a metal casting process similar to sand casting, in that molten metal is poured into an expendable mold. However, in shell mold casting, the mold is a thin-walled shell created from applying a sand-resin mixture around a pattern. The pattern, a metal piece in the shape of the desired part, is reused to form multiple shell molds. A reusable pattern allows for higher production rates, while the disposable molds enable complex geometries to be cast. Shell mold casting requires the use of a metal pattern, oven, sand-resin mixture, dump box, and molten metal.

Investment casting

Investment casting is one of the traditional casting methods. That is, the metal is heated to the temperature of the molten liquid, and then the material is poured into a mold designed with a suitable negative space and gated to effectively completely fill the molten metal. Once the metal has cooled and solidified, the metal part can be removed from the mold for finishing. Investment casting, also known as lost wax casting, is usually used to make jewelry and metal parts with complex shapes. 

Die casting 

Die casting is a kind of metal casting process, which is characterized by forcing molten metal under high pressure into the forming cavity. The cavity is made using two hardened tool steel molds, which have been processed into a certain shape, and die casting works similarly to injection molds.

Lost foam casting

Lost foam casting is a type of evaporative pattern casting. it maintains outstanding advantages, especially in casting complicated and precise molds.Unlike traditional methods which include the pattern withdrawn process before casting and require skillfulness in the pattern removal step, with respect to the lost foam method, the pattern is evaporated when the molten metal is poured into helping to reduce these considerations.

We will choose different casting methods for processing according to the product shape, material and your working conditions. Many years of processing experience can guarantee the quality of the casting parts.


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