Method for providing single piece with plural different mechanical characteristics

摘要

A method for producing a single solid metal work piece having different mechanical characteristics in different sections. A groove is cut in the piece between each section. A partitioning wall is inserted in the groove with the remainder of the groove filled with insulating material. Different sections are heated to different quenching temperatures then cooled at the same or different rates. For example, one section may be cooled by water spraying while another is cooled by air blast.