Numerical Simulation of Floating Morphology of Copper Alloy Strip in Air Cushion Heat Treatment Process

doi:10.12068/j.issn.1005-3026.2025.20230317

Abstract

Abstract:

Based on the geometric model and experimental data of the pilot air cushion furnace at Northeastern University， a fluid-structure coupling model was established to investigate the factors affecting strip floating morphology in the air cushion furnace. The results show that the model can accurately simulate the floating morphology of copper strips in air cushion furnace under different influencing factors. Air cushion pressure， strip tension， and strip thickness are the main influencing factors of strip floating morphology： the deformation of the strip will decrease or increase significantly when the air cushion pressures above and below the strip surface are changed. When the tension of thin strip is doubled， the maximum deformation near the lower and upper nozzles of the strip is reduced to 1/2 of the original value. When the thickness of the strip increases by 0.5 mm， the maximum deformation of the strip decreases significantly under the same surface air cushion pressure. The temperature in the air cushion furnace is a secondary factor. The furnace temperature is different， but the air cushion pressures on the surface and under the strip are the same， and the strip deformation is approximately the same. The numerical simulation provides a new method and idea for studying the deformation mechanism of strip suspension in air cushion furnaces.

Key words: fluid-structure coupling model, air cushion pressure, floating morphology, strip tension, strip thickness

CLC Number:

Hao-qiang SHI, Jia-dong LI, Peng ZHAO, Yong LI. Numerical Simulation of Floating Morphology of Copper Alloy Strip in Air Cushion Heat Treatment Process[J]. Journal of Northeastern University(Natural Science), 2025, 46(4): 24-32.

Figures/Tables 13

References 16

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组别	带材规格	下、上喷嘴高度 /mm	下、上喷嘴风速/（m·s ^-1）	带材下表面气垫压力/Pa	带材上表面气垫压力/Pa	带材压力差/Pa	带材自身压力/Pa
1	0.5 mm 铜带材3-3，27　℃	90-110	20.52-17.10	191.59	126.43	65.17	61
2	1.0 mm 铜带材3-3，27　℃	90-110	27.37-0.94	360.88	244.54	116.34	122
3	1.0 mm 铜带材3-3，27　℃	90-110	20.52-17.10	191.59	5.43	139.17	122
4	1.5 mm 铜带材3-3，27　℃	90-110	20.52-17.10	191.59	19.66	171.93	183
5	0.5 mm 铜带材3-3，600　℃	80-120	34.20-30.78	191.71	128.35	6.35	61

组别	带材规格	下、上喷嘴高度 /mm	下、上喷嘴风速/（m·s ^-1）	带材下表面气垫压力/Pa	带材上表面气垫压力/Pa	带材压力差/Pa	带材自身压力/Pa
1	0.5 mm 铜带材3-3，27　℃	90-110	20.52-17.10	191.59	126.43	65.17	61
2	1.0 mm 铜带材3-3，27　℃	90-110	27.37-0.94	360.88	244.54	116.34	122
3	1.0 mm 铜带材3-3，27　℃	90-110	20.52-17.10	191.59	5.43	139.17	122
4	1.5 mm 铜带材3-3，27　℃	90-110	20.52-17.10	191.59	19.66	171.93	183
5	0.5 mm 铜带材3-3，600　℃	80-120	34.20-30.78	191.71	128.35	6.35	61

影响因素	作用方式	板形控制应用
气垫压力	气垫炉喷嘴喷射的高速气流在带材表面形成气垫压力，托举带材悬浮在空气中并使得带材发生近似正弦形变形，是产生变形的关键	满足带材漂浮的前提下，通过调整带材的上、下气垫压力来控制带材的变形
带材张力	气垫炉前与炉后的张力辊组施加在带材前进方向两端的微张力	增大带材的张力可以降低带材的变形量，有利于薄带材的板形控制
带材材料、厚度	带材的材料和厚度由工厂的生产工艺确定，其通过改变带材的密度和刚度等物理参数来影响板形	对于较厚带材和刚度较高的带材无法形成合理的变形，可以调整其他影响因素
漂浮高度	控制带材在不同的漂浮高度，以获得不同的带材压力	气垫炉可以提供的气垫压力相对固定，通过改变漂浮高度可以更好地适配不同带材的要求，但要保持带材与上、下喷嘴的安全距离
炉内温度	由带材热处理工艺确定	炉温通过影响带材压力进而影响板形

影响因素	作用方式	板形控制应用
气垫压力	气垫炉喷嘴喷射的高速气流在带材表面形成气垫压力，托举带材悬浮在空气中并使得带材发生近似正弦形变形，是产生变形的关键	满足带材漂浮的前提下，通过调整带材的上、下气垫压力来控制带材的变形
带材张力	气垫炉前与炉后的张力辊组施加在带材前进方向两端的微张力	增大带材的张力可以降低带材的变形量，有利于薄带材的板形控制
带材材料、厚度	带材的材料和厚度由工厂的生产工艺确定，其通过改变带材的密度和刚度等物理参数来影响板形	对于较厚带材和刚度较高的带材无法形成合理的变形，可以调整其他影响因素
漂浮高度	控制带材在不同的漂浮高度，以获得不同的带材压力	气垫炉可以提供的气垫压力相对固定，通过改变漂浮高度可以更好地适配不同带材的要求，但要保持带材与上、下喷嘴的安全距离
炉内温度	由带材热处理工艺确定	炉温通过影响带材压力进而影响板形

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