Manual casting is still an important method for heavy duty castings produced by single piece and small batch. Manual sculpt can adapt to all kinds of complex requirements and is flexible, and does not require many process equipment. Steel, iron and most nonferrous alloy castings can be obtained by sand mold casting. In order to advance the surface quality of the castings, a coating is often painted on the surface of sand and core. Can Application of water glass sand, VRH water glass sand and organic ester water glass sand, clay, dry type resin self hardening sand and cement sand; heavy castings for a single production, the pit molding method is low cost, fast production.
The precision of castings obtained by various casting methods for precision casting is different, and the initial investment and productivity are not consistent, and the final economic benefits are also different. Therefore, to achieve more, faster, better, and provincial, we should take into account all aspects. A preliminary cost estimate should be made to determine the casting method selected to determine the casting method that has high economic efficiency and can guarantee the requirements of the casting.
The investment casting process is more complex and difficult to control. The materials consumed and consumed are more expensive, so it is suitable for producing small parts, such as complex shape, high accuracy, or difficult to do other processing, such as turbine engine blades. The multi product modeling or split box modeling method is more suitable for batch production or long-term production of stereotyped products. Although moulds and sand boxes start high investment, they can be compensated from saving molding hours and improving product quality.
