Surface finish and affected layer in milling of fine crystal grained stainless steel
Surface finish and affected layer in milling of fine crystal grained stainless steel
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DOI：
10.1016/j.jmapro.2015.06.003
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发表时间：
2015-08
影响因子：
6.2
通讯作者：
T. Komatsu;Y. Musha;T. Yoshino;T. Matsumura
中科院分区：
文献类型：
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作者：
T. Komatsu;Y. Musha;T. Yoshino;T. Matsumura
当微细加工中的去除深度减小时，材料中的晶粒度的影响变得相对较大。因此，为了实现微器件的高质量和高可靠性，必须对材料中的晶粒度进行细化。研究了不锈钢微细球磨过程中，晶粒度对表面光洁度、毛刺形成及影响层的影响。通过重复的材料形成和相变，使晶体平均尺寸减小到1.5xμm。进行了铣削试验，以测量切削力、表面光洁度、毛刺形状和受影响层的厚度。细晶粒钢的力分量比高于标准钢。细晶粒钢的切削力减小，摩擦力和/或压痕力增大。当晶粒尺寸较小时，毛刺的形成减少。在切割标准钢时，切削力中的X分量在槽端附近突然下降，并在槽边形成较大的毛刺。影响层在很大程度上取决于晶粒度。细晶粒钢在球磨过程中，影响层厚度明显减小。
When the removal depth in micro milling is downsized, the effect of the crystal grain in material becomes relatively large. The crystal grain in materials, therefore, should be downsized to achieve high qualities and high reliabilities of the micro devices. The study discusses the effect of the crystal grain size on the surface finish, burr formation and the affected layer in micro milling of stainless steel. The crystal grains are reduced to an average size of 1.5 μm by repetition of material forming and phase transformation. The milling tests were performed to measure the cutting forces, the surface finishes, the burr shapes and the thicknesses of the affected layers. The force component ratio of the fine grained steel is higher than that of the standard steel. The shearing force decreases in cutting of the fine grained steel; meanwhile, the friction and/or the indentation forces increase. Burr formation is reduced when the crystal grain size is small. In cutting of the standard steel, X component in the cutting force suddenly drops near the end of the groove and a large burr is formed on the edge of the groove. The affected layer largely depends on the crystal grain size. The thickness of the affected layer remarkable decreases in milling of the fine grained steel.