An experimental investigation on micro machining of fine-grained graphite
An experimental investigation on micro machining of fine-grained graphite
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DOI：
10.1007/s00170-014-5730-x
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
D. Huo;Chao Lin;K. Dalgarno
中科院分区：
文献类型：
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作者：
D. Huo;Chao Lin;K. Dalgarno
微铣削工艺的工业应用需要来自各种微工具的足够的实验数据。在过去的二十年里，人们对各种工程材料的微细铣削进行了研究。然而，在文献中没有关于石墨的微研磨的报道。本文对微细铣削成型细颗粒石墨的微细切削性能进行了实验研究。使用具有0.5 mm的均匀工具直径的金刚石涂覆的、TiAl N涂覆的和未涂覆的碳化钨微型端米尔斯进行全浸没槽铣削。实验是在一个标准的工业精密加工中心与高速微加工主轴。实验设计（DoE）技术被应用到设计和分析的加工过程。利用白色光干涉仪、扫描电镜和精密表面轮廓仪对不同加工条件下的表面粗糙度、表面形貌和毛刺形成进行了表征。采用方差分析方法分析了切削速度、进给量和轴向切深等切削参数变化对表面粗糙度和表面损伤的影响。实验结果表明，对于所有类型的刀具，进给速度对表面粗糙度的影响最显著，金刚石刀具对切削速度和切削深度不敏感。表面损伤和塑性分析表明，在实验切削条件下，材料去除的主要方式仍为脆性断裂或部分韧性。采用优化的加工条件制造了具有良好尺寸精度和表面光洁度的三维复杂微细电火花电极，以证明微细铣削是石墨加工的理想工艺。
Industrial applications of the micro milling process require sufficient experimental data from various micro tools. Research has been carried out on micro milling of various engineering materials in the past two decades. However, there is no report in the literature on micro milling of graphite. This paper presents an experimental investigation on micro machinability of micro milling of moulded fine-grained graphite. Full immersion slot milling was conducted using diamond-coated, TiAlN-coated and uncoated tungsten carbide micro end mills with a uniform tool diameter of 0.5 mm. The experiments were carried out on a standard industrial precision machining centre with a high-speed micro machining spindle. Design of experiments (DoE) techniques were applied to design and analysis of the machining process. Surface roughness, surface topography and burrs formation under varying machining conditions were characterized using white light interferometry, SEM and a precision surface profiler. Influence of variation of cutting parameters including cutting speeds, feedrate and axial depth of cut on surface roughness and surface damage was analysed using ANOVA method. The experimental results show that feedrate has the most significant influence on surface roughness for all types of tools, and diamond tools are not sensitive to cutting speed and depth of cut. Surface damage and burrs analysis show that the primary material removal mode is still brittle fracture or partial ductile in the experimental cutting conditions. 3D intricate micro EDM electrodes were fabricated with good dimensional accuracy and surface finishes using optimized machining conditions to demonstrate that micro milling is an ideal process for graphite machining.