| XIANG Dao-hui,GUO Zhen-hai,FENG Hao-ren,YAO Yun-long,LIU Zhong-yun,ZHAO Bo.Fabrication and Cutting Performance of Micro- and Nano-crystalline Diamond Coated Spade Drills[J],47(8):113-120 |
| Fabrication and Cutting Performance of Micro- and Nano-crystalline Diamond Coated Spade Drills |
| Received:March 19, 2018 Revised:August 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.08.017 |
| KeyWord:HFCVD MCD film NCD film spade drill cutting performance |
| Author | Institution |
| XIANG Dao-hui |
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo , China |
| GUO Zhen-hai |
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo , China |
| FENG Hao-ren |
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo , China |
| YAO Yun-long |
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo , China |
| LIU Zhong-yun |
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo , China |
| ZHAO Bo |
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo , China |
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| Abstract: |
| The work aims to study microstructure and surface quality of microcrystalline diamond film (MCD film) and NCD film (nanocrystalline diamond film), as well as cutting performance of MCD and NCD coated spade drills made from MCD and NCD films in cutting carbon fiber reinforced plastics (CFRP). The method of HFCVD was used to deposit MCD and NCD films on the surface of cemented carbide spade drills. Scanning electron microscope (SEM) was applied to observe surface and cross-sectional morphology of as-deposited diamond films, white-light interferometry was adopted to measure surface roughness of the films, Raman spectroscopy was used to assess structural components of the films, X-ray diffractometer (XRD) was used to characterize crystal structure and crystal orientation of the films, and cutting experiment was performed to investigate cutting performance of uncoated tool as well as as-deposited MCD and NCD coated tool. The two kinds of films were evenly coated with diamond grains on the tool, both films were 8 µm thick, and crystal orientations were mainly in direction (111) and (220). The diamond grains of MCD film displayed pyramid structures with sharp edges and corners, the average grain size was about 2~3 µm. MCD film contained angular grains, and average grain size was 2~3 µm; and NCD film had a smoother surface, and average grain size was about 100 nm. Surface roughness value Ra of the MCD and NCD films in measured areas was 0.4 µm and 0.24 µm, respectively. Under the same cutting conditions, the uncoated tool reached rejection standardand could not be used any more after drilling 30 holes. After drilling 50 holes, MCD and NCD coated tools sustained the maximum abrasion loss of 0.192 mm and 0.093 mm, respectively on the flank, and none of them exceeded dullness standard VB=0.2 mm (width of flank wear land). The NCD coated tool exhibited the best wear resistance.The MCD and NCD films, especially NCD film, can effectively improve wear resistance of carbide cutting tools and extend service lives of the tools. |
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