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采用热丝化学气相沉积法,以平行布置热丝方式及优化的预处理和沉积工艺,在复杂形状硬质合金立式键槽铣刀表面制备出均匀的微米级金刚石薄膜。通过扫描电镜和拉曼光谱研究了金刚石薄膜的形貌和成分。以高体积分数(65%)SiCP/Al复合材料为工件材料进行铣削试验,对比考察了金刚石薄膜涂层铣刀和无涂层铣刀的铣削特性。结果表明:在相同的铣削用量条件下,金刚石涂层铣刀的铣削力比无涂层铣刀的降低20%~60%;涂覆的金刚石薄膜附着强度较好,有效减轻了刀具磨损,使其寿命提高3~5倍;加工初期,无涂层刀具加工工件表面质量较好,但加工中后期工件表面质量迅速恶化,而金刚石涂层刀具加工工件的表面质量较稳定。
The hot filament chemical vapor deposition method was used to fabricate a uniform micrometer-scale diamond film on the surface of a complex shape carbide vertical key groove milling cutter by arranging the hot wire method in parallel and optimizing the pretreatment and deposition processes. The morphology and composition of diamond films were investigated by SEM and Raman spectroscopy. Milling experiments of high volume fraction (65%) SiCP / Al composites were carried out. The milling characteristics of diamond film-coated and uncoated milling cutters were compared. The results show that under the same milling conditions, the milling force of the diamond-coated milling cutter is reduced by 20% -60% compared with that of the uncoated milling cutter; the adhesion strength of the coated diamond film is better and the tool wear is effectively reduced Its life expectancy increased by 3 to 5 times. In the initial stage of processing, the surface quality of the uncoated tool processing workpiece was good, but the surface quality of the workpiece rapidly deteriorated in the middle and later processing stages, while the surface quality of the diamond coating tool processing workpiece was relatively stable.