Mold castings are the need of hour because of their cost effectiveness. Since you can cast it into any shape it has become first choice for parts being made with sand castings. In this method a metal casting die is used along with sand cores. The metal mold is preheated before production to increase its temperature to usable level. The mold built of two halves is closed molten metal is then filled in, after it solidifies due to cooling the mold is opened and casting ejected. The mold is closed again filled with special sand and process repeated.