| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot air circulation furnace capable of equalizing heat treatment conditions of workpieces regardless of storage spaces in performing heat treatment on the workpieces stored in multistage. SOLUTION: This hot air circulation furnace has a plurality of workpiece storage chambers 1305 vertically stacked with the doughnut shape, the hot air blown to a doughnut-shape center 1304 flows into the workpiece storage chambers 1305 disposed around it, and discharged to a hot air circulation passage 1306 positioned at an outer side of the doughnut shape from inner faces of the storage chambers through their outer faces. COPYRIGHT: (C)2008,JPO&INPIT
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