摘要
采用热丝CVD法制备纳米金刚石薄膜涂层刀具,利用场发射扫描电子显微镜表征薄膜的表面形貌,并用已制备的CVD金刚石涂层刀具,在无润滑干切条件下高速铣削7075铝合金工件,对其精铣工艺参数进行单因素及正交试验,探索精铣后工件的表面粗糙度变化规律并进行工艺参数优化。结果表明:随着主轴转速n从5000 r/min提高到8000 r/min,工件平均表面粗糙度在逐级缓慢降低;当进给速度v_(f)在1000~7000 mm/min范围内,随着v_(f)提高工件平均表面粗糙度快速增大,在v_(f)为7000 mm/min时,其值达1.790μm;当轴向切削深度a_(p)在0.1~0.4 mm范围内,随着a_(p)提高,工件平均表面粗糙度逐步增大,但a_(p)在0.2 mm之后其增大趋势变缓。对7075铝合金工件精铣表面粗糙度影响最大的是v_(f),其次为n,a_(p)的影响最弱;其精铣的最优参数组合是a_(p)=0.2 mm、v_(f)=1000 mm/min、n=8000 r/min,精铣后的表面粗糙度平均值为0.516μm。选用纳米金刚石薄膜涂层刀具精铣7075铝合金时,为得到较低的表面粗糙度,应选择高主轴转速、低进给速度、合适的轴向切削深度。
The nano-diamond film coated tool was prepared by hot wire CVD method.The surface morphology of the film was characterized by field emission scanning electron microscopy.The prepared CVD diamond coated tool was used to mill 7075 aluminum alloy workpiece at high speed under the condition of dry cutting without lubrication.The single factor and the orthogonal experiments were carried out on the finish milling process parameters to explore the variation law of the surface roughness of the workpiece after finish milling and optimize the process parameters.The results show that with the increase of spindle speed n from 5000 r/min to 8000 r/min,the average surface roughness of the workpiece decreases gradually.When the feed rate v_(f) is in the range of 1000~7000 mm/min,the average surface roughness of the workpiece increases rapidly with the increase of v_(f),and when v_(f) is 7000 mm/min,its value reaches 1.790μm.When the axial cutting depth a_(p) is in the range of 0.1~0.4 mm,the average surface roughness of the work-piece increases gradually with the increase of a_(p),but the increasing trend slows down after a_(p) is 0.2 mm.The Vf has the greatest influence on the finish milling surface roughness of 7075 aluminum alloy workpiece,followed by n and a_(p).The optimal parameter combination of finish milling 7075 is a_(p)=0.2 mm,vf=1000 mm/min,n=8000 r/min,and the aver-age surface roughness after finish milling is 0.516μm.When using nano-diamond film coated tools to finish milling 7075 aluminum alloy,the high spindle speed,the low feed rate and the a_(p) propriate axial cutting depth should be selec-ted to obtain low surface roughness.
作者
邵伟平
张韬
SHAO Weiping;ZHANG Tao(Department of Mechanical Technology,Wuxi Institute of Technology,Wuxi 214121,Jiangsu,China)
出处
《金刚石与磨料磨具工程》
CAS
北大核心
2022年第4期473-480,共8页
Diamond & Abrasives Engineering
基金
江苏省自然科学基金(BK20201142)。
