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    • 9. 发明专利
    • COOLING APPARATUS FOR HARDENING UNIT
    • JPS5585621A
    • 1980-06-27
    • JP15852178
    • 1978-12-25
    • TOKYO SHIBAURA ELECTRIC CO
    • HORI KATSUHIKO
    • C21D9/38C21D1/18C21D9/08
    • PURPOSE:To cool and harden uniformly a steel pipe of long size and of a large diameter, by heating the steel pipe by an induction coil at prescribed temp., then by spraying cooling water of controlled flow rate through plural spray nozzles made in a cooling water ejecting ring arranged at outside or inside of the steel pipe. CONSTITUTION:In hardening a steel pipe 1 of long size and of a large diameter, the steel pipe 1 is led into a horizontal hardening unit and is conveyed horizontally. An induction heating coil is arranged at the outer periphery of the steel pipe 1 and energized to heat the steel pipe to a hardening temp. Then the steel pipe 1 is quenched and hardened by spraying cooling water, which is delivered by pumps 5 from a water tank 6 through solenoid valves 7, a cooling water injecting ring 4, which is composed of upper, side, and lower parts 8, 9, 10, and through the nozzles made respectively in the upper, side, and lower parts 8, 9, 10. During the operation, quantities of water sprayed through the nozzles are controlled by the operations of the solenoid valves 7 so as to cool the steel pipe 1 uniformly. No uneven hardenind or not bending of the material is caused because no uneven cooling happens. The cooling water injecting ring 4 may be arranged within the steel pipe.