Advantages and disadvantages of coated sand

First, the advantages of coated sand
1. High precision: castings made of coated sand have high precision and good surface quality, and are not easy to appear defects.
2. Good thermal stability: the coated sand can withstand high temperature, will not heat deformation or collapse, and the size and shape of the casting can also remain stable.
3. Strong durability: the specially treated coated sand has high thermal stability and compressive strength, which can be reused many times, greatly reducing production costs.
4. Wide range of application: coated sand is suitable for the casting of iron, steel, copper, aluminum and other metals, as well as the casting of non-metals such as ceramics and glass, with great flexibility.
Second, the shortcomings of coated sand
1. High manufacturing cost: The manufacture of coated sand requires the use of special chemicals for treatment, and the production cost is relatively high.
2. Greater toxicity: The chemicals used in the manufacture of coated sand, such as phenolic resin and polyurethane, have certain toxicity to the environment and the human body.
3. Unable to manufacture larger size castings: due to the physical properties of coated sand, the size of the castings produced by it is small and cannot meet the manufacturing needs of large workpieces.
3. Applicable scenarios
1. Casting manufacturing requiring high precision and good surface quality.
2. Casting manufacturing requiring high thermal stability, such as high temperature or high pressure.
3. Mass production of relatively small size castings.
In short, although coated sand has its unique advantages and disadvantages, its advantages will be maximized in the application scenario. Therefore, in the selection of sand materials, it is necessary to choose according to the specific situation.