Method for partly reinforcing a workpiece

摘要

A method is disclosed for partly reinforcing a workpiece which is capable of reinforcing the reinforcement requiring part of the workpiece on which stress is liable to be concentrated upon use of the workpiece. A workpiece 1 made of metal having a reinforcement requiring part 10 and a forming die 3 are provided. The reinforcement requiring part 10 of the workpiece 1 is heated up to a higher temperature than the other part 18. The reinforcement-requiring part 10 is quenched and reinforced as compared to the other part 18 by bringing the forming surface area of the forming die 3 into direct contact with at least the reinforcement-requiring part 10 of the workpiece 1 which is then strongly pressed.