| 摘要 |
PURPOSE:To execute with a high accuracy and easily a hole working of a quenching unavailable part by cooling the quenching unavailable part of a work by jetting a cooling water, and also installing a high frequency coil to a part to be quenched, and heating it by a high frequency. CONSTITUTION:A high frequency current is supplied to a heating coil 15 through a lead part 16 from a high frequency generator, and a part to be quenched 2 of a work 1 is brought to high frequency quenching by the coil 15. In this case, a cooling water is jetted from a nozzle hole 11 of a water cooling pipe 12 to a quenching unavailable part 10, a pressurized air is jetted from a nozzle port 14 of an air pipe 13 of both sides of the upstream in its jet direction, and by its air, it is controlled that a flow of the cooling water expands in the width direction. Therefore, the part to be quenched 2 is brought to high frequency quenching and the quenching unavailable part 10 is not quenched. |
