Lost Foam Casting
Lost-foam casting is a type of evaporative-pattern casting process that is similar to investment casting except foam is used for the pattern instead of wax. This process takes advantage of the low melting point of foam to simplify the investment casting process by De-waxing. It is advantageous for very complex castings that would regularly require cores. It is also dimensionally accurate, maintains an excellent surface finish, requires no draft, and has no parting lines so no flash is formed. Tolerance can be IT7-IT9, and machining storage can be max 1.5-2mm, this can save the machining cost too. According to its limitation, not all the material is suitable to use this process, the best material is grey iron, and second is non-iron alloys, then common carbon steel, and ductile iron. The more complex the casting part is, the more advantage and economic benefit the lost wax casting shows.