The pattern is used to form the external contour of the casting,and the core box is used to make sand cores to form the internal contour of the casting.When shaping,use patterns and core boxes to make molds and cores respectively.Below image

Represent the relationship between parts,patterns,core boxes,and castings respectively.The materials used for manufacturing patterns and core boxes are related to the size of the castings,production scale,and molding method.When producing single pieces in small batches or hand shaping,wood is commonly used to make patterns and core boxes.When producing in large quantities or machine shaping,metal materials(such as aluminum alloy,cast iron,etc.)or hard plastic are commonly used to make patterns and core boxes.