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首页> 外文期刊>Journal of Mechanical Science and Technology >Investigation of the polishing characteristics of metal materials and development of micro MR fluid jet polishing system for the ultra precision polishing of micro mold pattern
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Investigation of the polishing characteristics of metal materials and development of micro MR fluid jet polishing system for the ultra precision polishing of micro mold pattern

机译：金属材料的抛光特性研究及用于微模具图案超精密抛光的微MR流体喷射抛光系统的开发

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摘要

Abrasive fluid jet polishing processes have been used for the polishing of optical surfaces with complex shapes. However, unstable and unpredictable polishing spots can be generated due to the fundamental property of an abrasive fluid jet that it begins to lose its coherence as the jet exits a nozzle. To solve such problems, MR fluid jet polishing has been suggested using a mixture of abrasives and MR fluid whose flow properties can be readily changed according to imposed magnetic field intensity. The MR fluid jet can be stabilized by imposed magnetic fields, thus it can remain collimated and coherent before it impinges upon the workpiece surface. In this study, Micro MR fluid jet polishing system was developed to investigate the polishing characteristics of micro mold material (Brass and nickel). Preferentially, to evaluate the stability of the developed Micro 'MR fluid jet polishing system, polishing spots and cross-section profiles with polishing time were investigated. As a result, the surface roughness of brass was Ra = 1.84 nm, and the nickel was Ra = 2.31 nm by the developed micro MR fluid jet polishing system. Finally, it can be confirmed that the developed Micro MR fluid polishing system can be applied for stable and predictable precise polishing of micro mold materials (Brass and nickel). In present study, as a basic step for modeling the fatigue behavior of an extruded Al alloy cylinder, the fatigue crack growth data of the alloy was collected in two orientations. Microstructural analysis revealed that the material had recrystallized grains and clusters of constituent particles aligned in the direction of extrusion. Fatigue life of the samples revealed a shorter fatigue life representing a higher fatigue crack growth rate in transverse direction.
机译：磨料射流抛光工艺已用于抛光具有复杂形状的光学表面。但是，由于磨料射流的基本特性，即当射流离开喷嘴时，它开始失去连贯性，可能会产生不稳定且不可预测的抛光斑。为了解决这些问题，已经建议使用磨料和MR流体的混合物的MR流体喷射抛光，其流动特性可以根据施加的磁场强度而容易地改变。 MR流体射流可以通过施加的磁场来稳定，因此在撞击到工件表面之前可以保持准直和连贯。在这项研究中，开发了Micro MR流体喷射抛光系统以研究微模具材料（黄铜和镍）的抛光特性。优选地，为了评估已开发的Micro'MR流体喷射抛光系统的稳定性，研究了抛光点和横截面轮廓随抛光时间的变化。结果，通过开发的微MR流体喷射抛光系统，黄铜的表面粗糙度为Ra ＝ 1.84nm，并且镍为Ra ＝ 2.31nm。最后，可以肯定的是，开发的Micro MR流体抛光系统可用于对微模具材料（黄铜和镍）进行稳定且可预测的精确抛光。在本研究中，作为模拟挤压铝合金圆柱体疲劳行为的基本步骤，在两个方向上收集了合金的疲劳裂纹扩展数据。显微组织分析表明，该材料具有重结晶晶粒和沿挤出方向排列的组成颗粒簇。样品的疲劳寿命显示出较短的疲劳寿命，代表较高的横向疲劳裂纹扩展率。

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