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Effect of rolling reduction of composite tube finned tube

As the rolling reduction of the composite tube finned tube increases, the height of the outer wing and the height of the inner rib also increase. According to the law of metal flow during the rolling process, the amount of reduction is increased, and the depth of the blade to cut the copper tube will increase. Due to the limitation of the rolling shape, the metal which is radially compressed cannot flow to the axial direction, so it is forced to resist. The gap between the smaller roll blades flows, thereby increasing the height of the outer fins. In addition, as the rolling reduction increases, the rolling force of the inner aluminum tube will also increase. Under the action of the circumferential pressing force, the radially inward metal inward spiral core groove The flow increases the metal filling rate at the groove, thereby increasing the height of the inner rib. Therefore, the increase of the rolling reduction is beneficial to increase the outer wing height and the inner rib height of the fin tube. Improve heat transfer performance requirements.
It should be pointed out that the rolling reduction is not as large as possible, because the larger the reduction, the corresponding increase in rolling force, such as the deformation resistance of the outer metal, which will lead to rolling. Furthermore, in order to ensure the smooth assembly of the heat transfer tube, the outer diameter of the composite finned tube should be slightly smaller than the outer diameter of the smooth tube blank. If the amount of reduction is too large, the fin height increases too much and may exceed its use. Claim. The purpose of the inner surface area of ​​the tube and the improvement of its heat transfer performance, and these documents are all Japanese patents. Therefore, the production process of the composite finned tube has not been reported in more detail.
In order to meet these needs, composite tube finned tubes are produced. It combines the advantages of composite tubes and finned tubes. It is a new type of efficient heat transfer tube widely studied in the world. Combined with domestic and foreign materials, the development of Japanese composite finned tube series products is more extensive. For example, the Japanese patent literature reports the production of stainless steel axial composite finned tubes by stainless steel composite radial finned tubes and welding by rolling, but the products developed in Japan are inner surface finned tubes, WHIC. H can not make full use of the surface area of ​​the pipe to improve heat transfer performance. Therefore, the production process of these composite finned tubes has not been reported yet.