CVD金刚石涂层工艺对硬质合金立铣刀铣削CFRP性能的影响

Influence of CVD diamond coating process on performance of carbide end mill for cutting CFRP

传统硬质合金刀具铣削碳纤维复合材料(CFRP)时磨损严重,需在其上沉积金刚石薄膜涂层。在相同的硬质合金立铣刀基体上,改变沉积工艺,获得3种分别覆有粗晶、细晶和复合晶等不同CVD金刚石薄膜的刀具。用扫描电镜观察分析3种涂层的表面形貌。在相同条件下,用3种刀具切削CFRP并分析其刀具磨损机理。结果表明:复合晶工艺的金刚石涂层硬质合金立铣刀耐磨性最好、使用寿命最长,约为粗晶金刚石涂层铣刀的1.35倍、细晶金刚石涂层铣刀的1.59倍,更适合于CFRP材料的铣削加工。

CFRP,carbon fiber reinforced polymer,was a typical hard-to-process material that would cause serious tool wear when cut by conventional cemented carbide tools(CCTs).Therefore,the CCTs need diamond coatings.Three kinds of CCTs with different diamond coatings,namely rough-diamond,fine-diamond and compound-diamond due to depositing processes,were prepared,separately.The surface of coatings were analyzed by SEM,and the CCTs were used to cut CFRP under the same conditions to study the wear mechanism.Results show that CCTs with compound coatings have best wear resistance and longest serve life,which is almost 1.35 and 1.59 times of those of CCTs with rough-diamond coatings and fine-diamond coatings.In conclusion,CCTs coated with compound-diamond is more suitable for CFRP cutting.