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Patent Searching and Data


Title:
INDUCTION HARDENING EQUIPMENT FOR LONG-SIZE MATERIAL SUCH AS BALL THREAD SHANK
Document Type and Number:
Japanese Patent JPH04289123
Kind Code:
A
Abstract:

PURPOSE: To eliminate oxygen existing around a body to be hardened because an atmospheric temp. is elevated at the time of induction hardening and the body to be hardened is oxidized by the oxygen existing around and the occurrence of scale and surface roughing is brought about.

CONSTITUTION: A coil 14 is provided on the inlet side of a body 12 to be hardened and a cooler 16 is provided on the outlet side, and further, an annular body 18 is provided between the introduced body to be hardened and the coil. The annular body has a hollow part 20 having a sectional form mutually complementing together with the sectional form of the body 12 to be hardened, and the convection current of air can be inhibited between the coil and the body to be hardened. As a result, air is not supplied into the hollow part, and the oxidation at the surface of the body to be hardened can be prevented.


Inventors:
TAKI ATSURO
Application Number:
JP1991000055544
Publication Date:
October 14, 1992
Filing Date:
February 28, 1991
Export Citation:
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Assignee:
TSUBAKIMOTO PRECISION PROD
International Classes:
C21D1/09; C21D1/10; C21D1/667; C21D1/70; C21D9/00; C21D9/28; (IPC1-7): C21D1/09; C21D9/28