| 摘要 |
PURPOSE:To improve the bonding strength between an object, for example, of a metal or ceramic with a synthetic resin, by making holes each having an undercut in an object, and pouring a melted resin into the holes. CONSTITUTION:An object 21 is formed with holes 26 each having an undercut by laser working, and is placed in a mold for molding plastics, and a melted plastic is poured into the holes 26. Thus, the melted synthetic resin 16 fills the undercut sections of the holes 26 of the object through the straight sections thereof to form synthetic resin securing sections 16a, thereby obviating waste of the synthetic resin material. |
