Temperature uniformity of aluminum plate during double-sided jet heating and roller swing

doi:10.13251/j.issn.0254-6051.2022.01.030

Abstract

Abstract: Based on the heating process of aluminum plates in a roller-hearth quenching furnace, in view of the coupling problem of the double-sided multi-nozzle gas jet heat transfer and internal heat conduction of the plate, a mathematical model of jet heating process of the plate was established, and the influence of nozzle arrangement, hot air flow, aluminum plate thickness, and swinging period of roller-hearth on the surface heat transfer and the temperature uniformity of the plate was studied. The results show that the heat transfer effect of vertical jet of the nozzle is better than that of the inclined jet. When the nozzles at the vertical jet are staggered with 1/4 pitch, the surface temperature uniformity of the aluminum plate is the best. The uneven surface temperature of the aluminum plate caused by the jet flow is mainly concentrated in the early stage of heating, which is easy to cause deformation of the plate, and especially significant for the thin plate. A smaller hot air flow and a shorter swing period of roller-hearth can be used to improve the uniformity of surface temperature of the aluminum plate and reduce stress and strain of the material.

Key words: roller-hearth furnace, aluminum plate, jet heating, nozzle arrangement, temperature uniformity

CLC Number:

TK124

Zhao Yantao, Jiang Zeyi, Zhang Xinru, Wang Dijie. Temperature uniformity of aluminum plate during double-sided jet heating and roller swing[J]. Heat Treatment of Metals, 2022, 47(1): 178-184.

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