Sand casting, as a process widely used in the metal casting industry, can be divided into many types according to different application requirements and characteristics.
These classifications mainly depend on factors such as the humidity, binder and compaction method of the sand mold. The following are the three main classifications of sand casting:
Wet sand mold
Wet sand mold is the most common sand casting method. During the manufacturing process, the molding sand is kept wet. The advantages of wet sand casting are mainly reflected in the following aspects:
1. Convenient molding: Since the molding sand is in a wet state, it has good plasticity and is easy to mold.
2. Low cost: The equipment required for wet sand casting is simple and the cost is relatively low.
3. Wide application: It is suitable for casting of various metal materials, especially large and complex shaped castings.
However, wet sand casting also has some disadvantages, such as high surface roughness of castings, relatively low dimensional accuracy and geometric accuracy.
Dry sand mold
Dry sand casting is to dry the molding sand before casting to reduce its moisture content. The advantage of this method is mainly to improve the quality and precision of the casting. Since the sand mold has been dried before pouring, the defects of the casting caused by water evaporation can be reduced. In addition, dry sand molds are also suitable for casting processes that require higher temperatures and longer insulation time.
However, dry sand casting also has some disadvantages, such as greater difficulty in modeling, relatively high cost, and high technical requirements for workers in mold manufacturing.
Surface dried sand mold
Surface dried sand casting is to bake the surface of the manufactured wet sand mold to make its outer layer dry and maintain a certain humidity inside. This method combines the advantages of wet sand mold and dry sand mold, which not only ensures the dimensional accuracy and surface quality of the casting, but also reduces the cost. However, the control degree of surface drying is more difficult and requires experienced technicians to operate.
Of course, the classification of sand casting mainly depends on the state and treatment method of the molding sand. Different types of sand casting have their own advantages and disadvantages, so in practical applications, it is necessary to choose according to specific circumstances. If high-quality castings are required and the cost allows, dry sand molds or surface-dried sand molds can be selected; if the cost is limited or the quality requirements for castings are not very strict, wet sand casting can be selected. In actual operation, it is also necessary to comprehensively consider many factors such as material properties, process requirements and equipment conditions. These are the most basic process common sense for professional casting processors, so if you have a large-scale casting demand, you can choose Mulan Metal to cooperate, because Mulan Metal has 12 years of metal casting experience, and these customized castings are mainly exported, serving customers in more than 30 countries, with complete certificates. It can meet the customized OEM casting needs of customers from different countries.
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