| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas atmospheric furnace that can uniformly heat object in the gas atmosphere. SOLUTION: A retaining shelf 4 for retaining to store assembled enclosures 2 is located inside of an airtight vessel 3 of a gas atmospheric furnace 1. Two heaters 5 are interueningly placed close to the retaining shelf 4, and fans 6 are provided on each wall at a side opposite to the heater against the shelf 4. Uniform heating plates 7 are between each heater 5 and fan 6. The uniform heating plate 7 is partially cut from a base plate 8, to form gas passing holes 10 and fins 9. The angle of the fin 9 is set so as to feed gas uniformly to each enclosure 2. The plate 7 has a mirror surface. In the gas atmospheric heating, convection of the gas caused by the fan 6 is sent uniformly to the enclosures 2 owing to the action of the fin 9 of the pate 7, and heat from the heater 5 is supplied to all the enclosures 2 more uniformly than in the past. Radiated heat of the heater 5 is reflected efficiently by the mirror surface of the plate 7 with respect to the enclosures 2, and heat efficiency is improved.
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