Coating Failure Property of CVD Diamond Coated Tool in Machining of Sintered WC-Co

2017 ◽  
Vol 2017.9 (0) ◽  
pp. 164
Author(s):  
Erina SAHASHI ◽  
Fumihiro ITOIGAWA ◽  
Tomoya MINAMI ◽  
Takashi NAKAMURA
Keyword(s):  
Cvd Diamond ◽  
Coating Failure ◽  
Coated Tool

From Micro to Nanometric Grain Size CVD Diamond Tools

2009 ◽  
Vol 1243 ◽  
Author(s):  
Flávia A. Almeida ◽  
Margarida Amaral ◽  
Ermelinda Salgueiredo ◽  
António J.S. Fernandes ◽  
Florinda M. Costa ◽  
...  
Keyword(s):  
Base Material ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Surface Finishing ◽  
Coated Tools ◽  
Drill Bits ◽  
Coated Tool ◽  
Wear Mode ◽  
Steel Aisi ◽  
Hot Filament

ABSTRACTCVD diamond coated tools are developed for applications as different as turning of cemented carbides and bone drilling. The diamond films are deposited by Hot Filament Chemical Vapor Deposition (HFCVD), with grain sizes varying from conventional micrometric (12 μm) to nanometric (< 100 nm) and film thickness up to 50 μm. Silicon nitride (Si3N4) ceramics are chosen for the base material in order to guarantee maximal adhesion. Both the micrometric and nanometric CVD diamond grades endure the cemented carbide turning showing slight cratering, having flank wear as the main wear mode. However, nanocrystalline diamond present the best behavior regarding cutting forces (<150 N) and tool wear (KM=30 μm, KT=2 μm and VB=110 μm) and workpiece surface finishing (Ra=0.2 μm). In the case of the dental drilling experiments, a polymeric laminated test block is used to simulate the human mandible and maxilla. The temperature rise during drilling is monitored to prevent overheating above 42–47 °C that is known to cause tissue death and implant failure. It is possible to drill with a CVD diamond Si3N4 coated tool with significantly lower forces (fourfold smaller), lower rise in temperature (4°C less), lower spindle speeds (100 rpm) and higher infeed rates (30 mm/min), when compared to the commercial steel (AISI 420) drill bits.

Improvement on the Cutting Performance of CVD Diamond Coated Drills in Drilling CFRP

2012 ◽  
Vol 499 ◽  
pp. 366-371 ◽  
Author(s):  
Jian Guo Zhang ◽  
Ben Wang ◽  
Fang Hong Sun ◽  
Hang Gao
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Cutting Performance ◽  
Reinforced Plastics ◽  
Coated Tool ◽  
Hot Filament

Carbon fiber reinforced plastics (CFRP) is difficult to machine because of the extremely abrasive nature of the carbon fibers and its low thermal conductivity. CVD diamond films have many excellent properties such as wonderful wear resistance, high thermal conductivity and low friction coefficient, therefore depositing diamond films on the surface of drills is thought to be an effective way to elongate the lifetime of drills and improve the cutting performance. In this study, diamond films are deposited on the WC-Co drill using hot filament chemical vapor deposition (HFCVD) method. The results of characterization by the scanning electron microscope (SEM) and Raman spectrum indicate that the fabricated CVD diamond coated drill is covered with a layer of uniform and high-purity diamond films. The cutting performance of as-fabricated CVD diamond coated drill is evaluated in dry drilling CFRP, comparing with the uncoated WC-Co drill. The results demonstrate that the CVD diamond coated drill exhibits much stronger wear resistance. Its flank wear is about 50μm after drilling 30 holes, about one-third of that of WC-Co drill. Machining quality of the exit and internal wall of drilled holes shows better surface finish obtained by coated drill, which suggests that CVD diamond coated tool has great advantages in drilling CFRP.

Orthogonal Experimental Study on Tool Wear in Machining CFRP with CVD Diamond Film Coated Tool

2014 ◽  
Vol 1015 ◽  
pp. 10-13
Author(s):  
Ju Dong Liu ◽  
Dong Ming Yu ◽  
Jia Wei Jin ◽  
Xian Zhen Ye ◽  
Xiao Fan Yang
Keyword(s):  
Diamond Film ◽  
Feed Rate ◽  
Flank Wear ◽  
Orthogonal Experiment ◽  
Cvd Diamond ◽  
Spindle Speed ◽  
Reinforced Plastics ◽  
Coated Tool ◽  
Cvd Diamond Film ◽  
Cemented Carbide Tools

The influence of milling parameters on flank wear is investigated through the orthogonal experiment of milling carbon fiber reinforced plastics (CFRP) with CVD diamond film coated tools and cemented carbide tools. The results show that: the interaction between spindle speed and feed rate has significant impact on the flank wear of CVD diamond film coated tool, and the influence of factors to flank wear decrease in the order: interaction > feed rate > spindle speed > cutting width. When spindle speed of n is 5000r/min, feed rate of vf is 100mm/min, cutting width of ap is 1mm, the lifetime of CVD diamond film coated tool and the processing quality of CFRP parts can be improved.

Surface Finishing of Electrically Conductive Diamond Tools by Electrolytic Machining

2012 ◽  
Vol 565 ◽  
pp. 400-405 ◽  
Author(s):  
Manabu Iwai ◽  
Kiyoshi Suzuki
Keyword(s):  
Complex Shape ◽  
Cvd Diamond ◽  
The Other ◽  
Surface Finishing ◽  
General View ◽  
Workpiece Material ◽  
Electrically Conductive ◽  
Long Period ◽  
Electro Discharge Machining ◽  
Coated Tool

This paper deals with a new surface finishing method of electrically conductive diamond materials by making efficient use of an electrically conductive nature of the workpiece material, instead of conventional methods such as grinding, lapping and polishing using diamond abrasives. The authors focused on the electrolytic machining method and not on the electro discharge machining method for the two advantageous features of the electrolytic machining in addition to the general view that a better surface roughness could be obtained. One of those features is that no higher heat is generated at the machining point. This can eliminate a risk of the film delamination in the case where a workpiece is the CVD diamond coated tool. The other is that a wider machining gap is available between an electrode and a workpiece. This was thought to allow the electrolytic machining to be applied to a tool with a complex shape such as a drill and an endmill. Based on these concepts, electrolytic machining experiments were conducted on the electrically conductive diamond materials. From the results, it was found that the surface of the electrically conductive diamond could be smoothened enough by electrolytic machining though relatively long period of time was required.

scholarly journals Development of High-Performance Polycrystalline CVD Diamond-Coated Cutting Tools Using Femtosecond Lasers

2021 ◽  
Vol 15 (4) ◽  
pp. 413-421
Author(s):  
Xiaoxu Liu ◽  
◽  
Osamu Konda ◽  
Hiroko Furuhashi ◽  
Kohei Natsume ◽  
...  
Keyword(s):  
High Performance ◽  
Cutting Tools ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Laser Parameters ◽  
Shaping Process ◽  
Tool Edge ◽  
Coated Tool ◽  
Fs Laser ◽  
Diamond Peak

Pulse laser grinding (PLG), an edge-shaping process, was developed previously to implement high-performance cutting tools. In this study, two femtosecond (fs) lasers with wavelengths of 1045 nm and 257 nm were used to conduct PLG on chemical vapor deposited (CVD) diamond-coated tool edges, as the fs laser is reported to have less thermal impact and the potential to improve the material crystallinity. We investigated the effects of the laser parameters on the tool edge formation and microstructural changes. The results show that although the infrared fs laser could – compared to the conventional nanosecond (ns)-laser PLG – naturally suppress surface thermal damage, the roughness of the processed surface remained relatively high with an Rz of 0.21 μm. However, under the optimal laser parameters proposed in this paper, an ultraviolet fs-laser PLG was used to obtain a much smoother edge, reducing Rz to approximately 0.08 μm. Moreover, scanning electron microscopy images indicated that the longitudinal machining marks on the ns-laser-processed surface were significantly reduced, with virtually no attached debris on the surface. Furthermore, from the Raman spectra, a significant increase in the diamond peak intensity was observed, indicating that the crystallinity of the CVD diamond (CVDD) was improved following ultraviolet-fs-laser PLG. These results demonstrate that edge shaping and structural modification of polycrystalline CVDDs can be integrated into ultraviolet-fs-laser PLG.

Improvement of CVD Diamond Coated Tool by Femto-Second Laser Irradiation

2017 ◽  
Vol 2017 (0) ◽  
pp. S1340203 ◽  
Author(s):  
Fumihiro ITOIGAWA ◽  
Kyoshi INOUE ◽  
Shingo ONO ◽  
Masaaki SUDO
Keyword(s):  
Laser Irradiation ◽  
Cvd Diamond ◽  
Coated Tool

The Cutting Behavior of Diamond Coated Tool in Machining Al-20wt%Si Alloy

2010 ◽  
Vol 431-432 ◽  
pp. 365-368
Author(s):  
Wen Zhuang Lu ◽  
Dun Wen Zuo ◽  
B. Yang ◽  
Feng Xu ◽  
M. Wang
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Cutting Force ◽  
Feed Rate ◽  
Cutting Tool ◽  
Cvd Diamond ◽  
Cemented Carbide ◽  
Depth Of Cut ◽  
Coated Tool ◽  
Coated Cemented Carbide

The performance of CVD diamond coated cemented carbide cutting tool in comparison with K10 uncoated cemented carbide tool in the dry turning of Al-20wt%Si aluminum-silicon hypereutectic alloy was investigated. The obtained results showed a better cutting performance for CVD diamond coated tool in machining Al-20wt%Si, particularly in terms of cutting force, tool wear, surface roughness, when compared with K10. The cutting forces are lower with CVD diamond coated tool and the depth of cut promotes a great increment of the cutting force. The tool wear processes taking place in the tool tips in all cutting conditions. The tool life of CVD diamond coated tool is longer than that of the uncoated K10. The surface roughness Ra increases obviously with the increase of feed rate using a CVD diamond coated cutting tool. A higher feed rate produces surface rougher. The chip morphology in machining of Al-20wt%Si alloy by CVD diamond coated tool is continuous. The tests showed that the CVD diamond coated tool can be applied on the K10 tool at low feed rate to produce high quality surfaces.

Hydrogen embrittlement of titanium during microwave plasma assisted CVD diamond deposition

2000 ◽  
Vol 16 (4) ◽  
pp. 355-360 ◽  
Author(s):  
Y. Fu ◽  
B. Yan ◽  
N.L. Loh ◽  
C.Q. Sun ◽  
P. Hing
Keyword(s):  
Hydrogen Embrittlement ◽  
Microwave Plasma ◽  
Cvd Diamond ◽  
Diamond Deposition
Sign in / Sign up

Export Citation Format

Share Document