HARDENING APPARATUS OF LONG WORK AND HARDENING METHOD OF LONG WORK

摘要

PROBLEM TO BE SOLVED: To execute a hardening work low in strain by preventing uneven cooling, or the like, due to injected cooling liquid, or the like, in the hardening of a long work. SOLUTION: This hardening apparatus for long work is used for heating the long work W relatively shifted in the longitudinal direction X with a heating coil 200 and cooling the hardening surface heated with the heating coil 200 with a cooling means 300. The cooling means 300 is constituted with cooling rollers 310 arranged so as to abut on the hardening surface to cool the hardening surface of the long work W.