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热柱冷凝端的表面结构对其传热性能的影响起着至关重要的作用,粗糙的微沟槽表面形貌有利于强化冷凝。提出了热柱冷凝端表面加工微沟槽的实验加工方法,建立了犁切挤压刀具加工热柱冷凝端的有限元模型。利用deform软件模拟犁切挤压刀具加工热柱冷凝端微沟槽,分析了微沟槽的成形过程及机理。有限元模拟结果表明:在加工环状沟槽时冷凝端表面形成了V形沟槽,两V形沟槽之间形成U形沟槽,V形沟槽两端有鼓包,形成沟槽翅。在轴向沟槽加工时,表面形成了相互正交的微沟槽,呈现许多U形微沟槽。进给量和犁切挤压深度对热柱冷凝端微沟槽形貌起着重要作用,犁切挤压深度越大,微沟槽表面形貌越粗糙,但是受刀具强度和刚度的影响,犁切挤压深度不能过大。进给量过大和过小,都不利于微沟槽表面形貌,只有当进给量恰当,才能形成最优的微沟槽表面形貌。
The surface structure of the condensing end of the hot column plays a crucial role in the heat transfer performance. The rough micro-groove surface morphology is conducive to enhanced condensation. The experimental method for processing microgrooves on the condensation surface of the hot column was proposed and the finite element model of the hot condensation column was established. The deform software was used to simulate the plow-cutting tool to process the micro-grooves on the condensation side of the hot column. The forming process and mechanism of the micro-grooves were analyzed. The results of finite element simulation show that V-shaped grooves are formed on the condensation end surface during the processing of the annular groove, and U-shaped grooves are formed between the two V-shaped grooves, and bulges are formed at both ends of the V-shaped grooves. In the axial groove machining, the surface is formed mutually orthogonal micro-grooves, showing a number of U-shaped micro-grooves. The amount of feed and the depth of plow-cutting extrusion play an important role in the microgrooves condensation in the hot column. The greater the plow-cutting depth, the rougher the microgrooves, however, influenced by the strength and stiffness of the tool, Plow cut extrusion depth can not be too large. Feed is too large and too small, are not conducive to the micro-groove surface morphology, and only when the appropriate amount of feed, in order to form the optimal micro-groove surface morphology.