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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Precision milling of high volume fraction SiC_p/AI composites with monocrystalline diamond end mill
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Precision milling of high volume fraction SiC_p/AI composites with monocrystalline diamond end mill

机译：用单晶金刚石立铣刀精密铣削高体积分数SiC_p / AI复合材料

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摘要

Silicon carbide particle-reinforced aluminum matrix (SiC_p/Al) composites have attracted considerable interest as potential materials due to their excellent engineering properties. Many research works have been done associated with turning SiC_p/Al in the past. However, it still lacks of experience on milling of SiC_p/Al composites. This paper presents an exploratory study on precision milling of SiC_p/Al composites with higher volume fraction (SiC_p, 65%) and larger particle size. The experiments were conducted on a Kern MMP 2522, high-precision micromilling machine center. A single flute monocrystalline diamond end mill was used to mill straight grooves with cutting parameters in a few micros. The machined surface quality including surface roughness and surface topography were studied. The cutting mechanisms of SiC particle and tool wear characters were also investigated. The results showed that mirror-like surface with surface roughness around 0.1 μm Ra can be achieved by precision milling with small parameters in the range of a few micros. Most of the SiC reinforcements were cut in partial ductile way with microfractures and cracks on the machined surface; tool wear included chipping and cleavage on monocrystalline diamond edge. A large flank wear on tool bottom face was observed and suspected to be caused by coaction of chemical transition and mechanical abrasion.
机译：碳化硅颗粒增强铝基（SiC_p / Al）复合材料由于其出色的工程性能而作为潜在材料引起了人们的极大兴趣。过去，已经完成了许多与车削SiC_p / Al相关的研究工作。但是，仍然缺乏研磨SiC_p / Al复合材料的经验。本文提出了对具有较高体积分数（SiC_p，65％）和较大粒径的SiC_p / Al复合材料进行精密研磨的探索性研究。实验是在Kern MMP 2522高精度微铣削加工中心进行的。单槽单晶金刚石立铣刀用于铣削具有几微米的切削参数的直槽。研究了加工表面质量，包括表面粗糙度和表面形貌。研究了SiC颗粒的切削机理和刀具磨损特性。结果表明，可以通过在几微米范围内的小参数进行精密铣削来获得表面粗糙度Ra约为0.1μm的镜面状表面。大部分SiC增强材料都是局部延展性的，在加工表面上有微裂纹和裂纹。工具磨损包括单晶金刚石边缘的崩裂和开裂。观察到工具底面上的大侧面磨损，并怀疑是由于化学转变和机械磨损共同作用引起的。

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