Method for manufacturing piston of automobile engine

摘要

A method for manufacturing a piston can prevent casting defects such as oxide inclusions or shrinkage cavities on the surface of a combustion chamber over a piston head after casting. The method includes casting a head top having a bowl by pouring a first molten metallic material into a first mold with a bonding portion of the head top to be formed at an upper portion in the first mold and a first riser on the bonding portion of the head top, casting the body by pouring a second molten metallic material into a second mold, with a bonding portion of the body to be formed at an upper portion in the second mold and a second riser on the bonding portion of the body, removing the risers from the head top and the body, and integrally bonding the head top and the body to form the piston.

主权项

1. A method for manufacturing a piston of an automobile engine, the method comprising:
casting a head top having a bowl by pouring a first molten metallic material into a first mold, with a bonding portion of the head top to be formed at an upper portion in the first mold and a first riser on the bonding portion of the head top; casting a body, which is a part of the piston excluding the head top, by pouring a second molten metallic material into a second mold, with a bonding portion of the body to be formed at an upper portion in the second mold and a second riser on the bonding portion of the body; removing the risers from the head top and the body; and integrally bonding the head top and the body at the bonding portions of the head top and the body, thereby forming the piston, wherein a top ring groove is integrally formed on the head top.