成形挤出切削法制备翅片及其成形能力研究

Study on Forming Extrusion Cutting (FEC) Producing Fins and Its Forming Performance

切屑是一种再利用难度高且消耗大的加工废料,而目前的切屑转化利用工艺都是将已成形的切屑进行回收再利用,流程复杂,经济效益较差。成形挤出切削(Forming extrusion cutting, FEC)作为一种新的切屑再利用工艺,可以在不影响正常切削的情况下直接在切削过程中将切屑塑形为具有工业价值的翅片带材,具有高效,经济,节能的特点。然而,FEC作为一种新的切屑回收工艺,对其成型过程的研究还十分匮乏。通过不同切屑压缩比λ,切削刀具前角α和翅片齿形结构所影响下的纯铜材料成形结果对FEC的变形过程进行了研究。结果表明,在0.7 <λ<1.5的范围内,FEC的成形效果随切屑压缩比λ的减小而提高;在10°<α<30°时,切削刀具前角的变化对于FEC成形效果没有明显的影响。在λ=0.7,α=10°条件下,不同结构的沟槽带材齿形填充率均超过了80%,说明FEC具有较强的成形能力。另外,生成的翅片表面具有丰富的亚结构,这使得FEC制备的翅片带材在热交换领域中拥有广泛的应用前景,因而FEC具有巨大的实用价值与发展潜力。

Every year,a huge number of chips are produced,while the recycling of waste meets difficulties and the high cost issue.The present recycling process always takes the formed chips into process,which needs complex work-flow,and leads to a low level of economic efficiency.As a novel chip recycling technology,forming extrusion cutting(FEC)can directly turn the chips into grooved strips during the chip forming stage,which has little effect on the normal cutting process,and the grooved strips are featured with industrial value as fins.This process is energy and cost efficient.However,there are few studies on the deformation process of FEC.It deals with the deformation process of FEC,as well as the effect concerning forming performance from different chip compression ratiosλ,different rake angles of the cutting toolαand different groove structures.The result shows that among the ranges from 0.7 to1.5,the forming conservation rate decreases with the increase ofλ,while the forming conservation rate failed to show trends with the variation ofαfrom 10°to 30°.At the condition ofλ=0.7 andα=10°,the forming conservation rate of each structure exceeds 80%,showing that FEC could be effective and stable in producing grooved strips.Furthermore,the surface substructure provides fins produced by FEC with a prospect in the heat transfer industry,thus FEC shows great practical value and development potential.