アルミニウムおよび銅条材表面への小ピッチ溝列形成法 : 高性能沸騰伝熱面製造のための溝形成圧延に関する実験的研究

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  • Fine pitch grooving on the surfaces of aluminum and copper strip : experimental study on grooved rolling for producing enhanced boiling surfaces
  • アルミニウム オヨビ ドウ ジョウザイ ヒョウメン エ ノ ショウ ピッチ コ

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Recently, new processes to produce enhanced boiling surfaces have been developed. Those are extrusion, a combination of extrusion and chipping, mechanical rolling, hydraulic expansion, and sintering of metal powder, all of which involve complex operations and high production costs. Grooved rolling is introduced as a simple process to form enhanced boiling surfaces. First, the deformation caused by grooved rolling was analysed by applying a visioplasticity method with plasticine model rolling. Characteristic deformations using the grooved rolling technique occur in the form of a continuous indentation by the teeth of the grooved roll to the surface of a plane sheet or strip, deformation is mainly confined to the region between the teeth of the upper grooved roll and lower flat roll, plastic flow of the work occurs mainly in a longitudinally and the tips of rib projections formed by grooved rolling are rounded. Second, grooved rolling of thin aluminum and copper strips was examined and it was found that 1mm pitch grooves can be formed on the strip surfaces successfully. Finally, three-stand tandem mill, by which longitudinal grooving, additional 45 degree cross grooving, and flattening and trimming of the rounded tips of the rib projections could be performed, was introduced as a test system, and some examples of products were obtained by the system.

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