| 摘要 |
A heat transfer apparatus for controlling the temperature of a formed workpiece is provided. The apparatus is in the form of a multi-tier rotary preheat, quench and heat recovery tunnel which provides for transfer of heat between tiers from workpieces to be cooled to workpieces to be heated, thereby conserving heat energy. Transfer of heat is accomplished by means of fans interconnected with the tier levels of the tunnel. A control system ensures proper temperature of air, passing through a hot-air fan, which is removed from a second level and transferred to a first level. Means are provided for loading slugs to be preheated prior to forming onto a first annular tray on the first level and for removing same after it has completed a single rotation about the cooling tunnel. After being further heated in an induction furnace, the slug is warm formed in a press to a desired configuration. The shaped workpiece is then transferred to the tunnel and loaded onto a second tier on a second level, below the first level. As the workpiece on the second tier completes a single rotation in a direction counter to the direction of rotation on the first tier, heat is transferred using circulated air as a transfer medium from the workpiece to the slug by means of the hot-air fan. The cooled workpiece on the second tier is transferred after a single rotation to a third tier on a level therebelow and moves in the same direction as the second tier. A air/water quench is provided on the third level and a cold-air fan circulates the moist air therein. Hot, dry and warm, moist air are available from the hot-air fan and quench-air fan, respectively, for plant process requirements.
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