This is a process that made in the sand mould. Steel, iron and a lot of nonferrous alloys can be made with this process. Since the sand mould is cheap, easy to get and to make, sand casting is used for a wide variety of products for many different industries, and the parts’ weight can be from min 0.1KG to max 100T. Because of this big range, we have four sand casting processes to choose: green sand, resin sand, water glass sand, and shell molding. Each of them will be suitable for different shapes, materials, and tolerances. Those casting products are widely used in automotive industry, pumps and valves, engineering machinery industry, and machinery parts. Materials can be carbon steel, stainless steel, ductile iron, gray iron and copper, etc.
The name comes from the fact that wet sands are used in the molding process. Green sand casting process is screening and mixing the wet sands, and filling the sands into the sand boxes, then use machines or just by workers to tamp the sands, then pouring the liquid iron into the sand molds. Green sand casting parts are high quality and very cost effective. It still remains one of the most popular methods for producing inexpensive, and more used for ductile iron casting parts. We have three different molding way, hand molding, jolt squeezer, and disa automatic molding. Green sand casting process is suitable to produce small and medium castings with weight under 50 kilograms, used for automobile industry, general industry, mining equipment, agricultural machines, etc. But, this process is suitable too for the bigger parts with several tons.
Resin sand casting process is mixing the furan resin and sand together, then filling the mixed sands into the sand boxes, then after tamping, using the paints to flush the surfaces of molds, then burning the paints to make the sand molds to become very hard, finally, pouring the liquid iron into the solid sand molds. It is better than green sand, since it improves with less casting defect such as sand holes, air holes and shrinkage. At the same time, resin sand process can keep excellent dimensional accuracy. Clean surface and clear outline make the castings look very nice too. This process is used for a lot of materials, steel, iron or alloys, etc. Resin sand casting process is suitable to produce large iron castings with weight range from dozens of kilograms to several tons. Our main products are used for valves and pumps, automobile industry, engineer machines, and other general industries.
Water glass sand
Shell molding, also known as shell-mold casting, is an expendable mold casting process that uses a resin covered sand to form the mold. As compared to sand casting, this process has better dimensional accuracy, a higher productivity rate, and lower labor requirements. It is used for small to medium parts that require high precision. 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. Shell mold casting allows the use of both ferrous and non-ferrous metals, most commonly using cast iron, carbon steel, alloy steel, stainless steel, aluminum alloys, and copper alloys. Typical parts are small-to-medium in size and require high accuracy, such as gear housings, cylinder heads, connecting rods, and lever arms, and weight is min0.1KG to max 100KGS.