复杂形状硬质合金刀具金刚石涂层的制备及铣削特性研究

Research on Diamond Coating Preparation and Milling Characteristics of Cemented Carbide Tools with Complex Shape

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。

Micron-sized diamond films were uniformly deposited on the surface of cemented carbide vertical keyway milling tools with complex shape by hot filament chemical vapor deposition,where parallel hot filament arrangement and optimized processes of pretreatment and deposition were adopted.SEM and Raman spectra were employed to study morphology and composition of the diamond films.Milling experiments were carried out with high volume fraction（65%）SiCP/Al composite as the workpiece material.And milling characteristics were investigated and compared between diamond film coated milling tools and uncoated milling tools.The results show that with the same milling parameters,cutting force of diamond film coated milling tools is reduced by 20%～60% compared with uncoated milling tools.With high surface adhesion strength,diamond films effectively reduce tool wear and increase tool life by 3～5 times.During early processing,surface quality of the workpieces from uncoated tools is better,but rapidly deteriorates during later processing.In contrast,surface quality of the workpieces from diamond film coated tools is more stable.