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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >A study of cutting factors affecting the generation of functional hierarchical rib array structure in ultra-precision raster milling
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A study of cutting factors affecting the generation of functional hierarchical rib array structure in ultra-precision raster milling

机译：超精密光栅铣削中影响功能分层肋阵列结构生成的切削因素研究

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摘要

Hierarchical ribs can be used to keep balance between heat transfer enhancement and pressure drop reduction. The unique hierarchical structure which features a first-order asymmetric arc rib imposed by second-order microgrooves greatly reduces the pressure drop as well as enhances the heat transfer. However, it is hard for conventional machining techniques to generate such complicated configurations, especially freeform geometries in the micron range. Taking advantage of ultra-precision raster milling (UPRM), a novel one-step machining process, for advanced hierarchical ribs is proposed and demonstrated. In this paper, the principle of the cutting strategy for the second-order microstructures and cutting conditions that affect the basic features of the structures are discussed. In addition, three-level factorial design of cutting speeds, feed rates, and depth of cuts were set and used to machine hierarchical ribs on a copper workpiece. It was found that the cutting strategy was affecting the geometry of second-order microstructures of hierarchical ribs in UPRM. Moreover, the result revealed that at low levels of feed rate and cutting depth, a middle level of cutting speed provides a better quality of second-order microstructures than a middle level of feed rate, high level of cutting depth, and low level and high level of cutting speed. Maintaining a balance between machining efficiency and hierarchical structure generation quality is thoroughly assessed by machining second-order microgrooves on asymmetric arc primary surfaces.
机译：分层肋可用于在传热增强和压降降低之间保持平衡。独特的分层结构具有由二阶微槽施加的一阶不对称弧肋，大大降低了压降并增强了热传递。但是，传统的加工技术很难产生这种复杂的构造，尤其是微米范围内的自由形状。利用超精密光栅铣削（UPRM）的优点，提出并演示了一种用于先进的分层肋的新颖的一步加工方法。本文讨论了二阶微结构切削策略的原理以及影响结构基本特征的切削条件。此外，还设置了切削速度，进给速度和切削深度的三级因子设计，并用于在铜工件上加工分层的肋。结果发现，切削策略影响了UPRM中分层肋的二级微结构的几何形状。此外，结果表明，在低进给速度和切削深度的情况下，中等切削速度比中高进给速度，高切削深度，低水平和高切削能提供更好的二阶显微组织质量。切割速度水平。通过在非对称弧形主表面上加工二阶微沟槽，可以全面评估保持加工效率与分层结构生成质量之间的平衡。

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