| 摘要 |
PROBLEM TO BE SOLVED: To structurally improve heating-up efficiency to a work by eliminating any disturbing structure in hot blast circulating path in a furnace chamber. SOLUTION: In a high speed heating-up furnace for heating up the work W at high speed by coaxially disposing a cylindrical work holding chamber 3 in the furnace chamber 2 and forcibly convecting the hot blast generated with a burner B as eddy current with a circulating fan 4, a door 7 is arranged at a second work carrying port 35 in the work holding chamber 3. Then, the circulating path for uniformly circulating the hot blast over the whole circumference between the furnace chamber 2 and the work holding chamber 3, is secured by closing the door 7.
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