MASS PRODUCTION OF HFCVD DIAMOND-COATED WIRE-DRAWING DIES WITHOUT FILAMENT THROUGH THE HOLE

2021 ◽  
pp. 2150006
Author(s):  
XIN SONG ◽  
CHENG-CHUAN WANG ◽  
XIN-CHANG WANG ◽  
FANG-HONG SUN
Keyword(s):  
Mass Production ◽  
Cfd Simulation ◽  
Chemical Vapor ◽  
Wire Drawing ◽  
Cemented Carbide ◽  
Small Aperture ◽  
Coated Wire ◽  
Volume Method ◽  
Hot Filament ◽  
Drawing Dies

Hot filament chemical vapor deposition (HFCVD) diamond-coated small aperture wire-drawing dies from [Formula: see text] to [Formula: see text][Formula: see text]mm are in high demand. A new deposition technique without filaments through the inner hole of wire-drawing dies is proposed, accompanied with the specially designed fixtures. Temperature distribution on the deposition surfaces is studied by computational fluid dynamics (CFD) simulation based on the finite volume method (FVM); both case study and mass production simulations are accomplished. Excellent performance and uniform multilayer MCD/NCD/MCD/NCD films are successfully deposited on the inner-hole surfaces of total 16 cemented carbide (WC-6wt.%Co) wire-drawing dies with an aperture of [Formula: see text][Formula: see text]mm in one batch. Drawing results of gas shield welding wires show that the lifespan of the multilayer diamond coated wire-drawing dies is about 20 times of the uncoated cemented carbide dies and 2 times of the monolayer MCD coated dies.

Study on Comparative Experiments of Performance of Conventional and Nanocrystalline Diamond Film

2006 ◽  
Vol 315-316 ◽  
pp. 847-851
Author(s):  
Ming Chen ◽  
Y.P. Ma ◽  
Dao Hui Xiang ◽  
Fang Hong Sun
Keyword(s):  
Diamond Film ◽  
Smooth Surface ◽  
Chemical Vapor ◽  
Nanocrystalline Diamond ◽  
Cemented Carbide ◽  
Deposition Parameters ◽  
Pin On Disc ◽  
Hot Filament ◽  
Work Done ◽  
Drawing Dies

Nanocrystalline diamond film with smooth surface and uniform grains was deposited successfully on Co-cemented carbide using the bias-enhanced hot filament chemical vapor deposition (HFCVD). The surface morphology and chemical quality of film were estimated by scanning electron microscopy (SEM), atomic force microscopy (AFM) and Raman spectroscopy. Comparative experiments of tribological and wear performances of conventional and nanocrystalline diamond films were carried out by pin-on-disc tester. The research results show that nanocrystalline diamond film with good tribological performance and high quality can be deposited by regulating the deposition parameters on Co-cemented carbide. The film not only has high adhesive strength but also has smooth surface, low surface roughness, low friction coefficient. The work done in this paper provide the wide application of diamond on complex shape tools, drawing dies and other wear resistant device with experimental reference.

Fabrication and Application of Diamond-Coated Bearing Support Implements

2006 ◽  
Vol 315-316 ◽  
pp. 210-214 ◽  
Author(s):  
Fang Hong Sun ◽  
Y. Wang ◽  
Zhi Ming Zhang ◽  
Ming Chen
Keyword(s):  
Vapor Deposition ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Cemented Carbide ◽  
Precision Grinding ◽  
Processing Level ◽  
Gas Source ◽  
Working Performance ◽  
Hot Filament ◽  
Quality Surface

The bearing support implement is the key component in the precision process of bearings. Diamond films are deposited on Co-cemented carbide bearing support implements using the acetone and hydrogen as the gas source by the bias–enhanced hot filament chemical vapor deposition (HFCVD) technique. Diamond-coated bearing support implements are fabricated and used in the precision grinding of bearings. The research results show that the appropriate pretreatment methods and CVD process can effectively control the morphology, chemical quality, surface roughness, and adhesion of diamond films. As compared with the cemented carbide bearing support implements, the diamond-coated bearing support implements have obviously better wear resistant properties and working performance. It is of great significance for improvement of the bearing processing quality and raising of the bearing processing level.

scholarly journals Lifetime in Steel Cord Wire Drawing Dies of WC–Co Cemented Carbide Containing TaNbC or Cr3C2

2018 ◽  
Vol 59 (5) ◽  
pp. 754-759
Author(s):  
Masayuki Takada ◽  
Hideaki Matsubara ◽  
Yoshihiro Kawagishi
Keyword(s):  
Wire Drawing ◽  
Cemented Carbide ◽  
Steel Cord ◽  
Drawing Dies

THE ABRASION RESISTANCE AND ADHESION OF HFCVD BORON AND SILICON-DOPED DIAMOND FILMS ON WC–Co DRAWING DIES

2017 ◽  
Vol 24 (07) ◽  
pp. 1750090 ◽  
Author(s):  
LIANG WANG ◽  
JINFEI LIU ◽  
TANG TANG ◽  
FANGHONG SUN ◽  
NAN XIE
Keyword(s):  
Adhesive Strength ◽  
Abrasion Resistance ◽  
Copper Wire ◽  
Diamond Films ◽  
Chemical Vapor ◽  
High Growth ◽  
Diamond Powder ◽  
Wire Drawing ◽  
High Growth Rate ◽  
Drawing Dies

Diamond films have been deposited on the interior hole surface of cobalt-cemented tungsten carbide (WC–Co) drawing dies from acetone, trimethyl borate (C3H9BO3), tetraethoxysilane (C8H[Formula: see text]O4Si, TEOS) and hydrogen mixture by hot-filament chemical vapor deposition (HFCVD) method. The structures and quality of as-deposited diamond films are characterized with field-emission scanning electron microscopy (FESEM) and Raman spectroscopy. The abrasion ratio and the adhesive strength of as-deposited diamond films are evaluated by copper wire drawing tests and ultrasonic lapping tests, respectively. The results suggest that diamond films with small grain size and high growth rate can be obtained due to the mutual effects of boron and silicon impurities in the gas phases. The results of ultrasonic lapping tests show that diamond films doped with boron and/or silicon can bear the severe erosion of the large diamond powder. Diamond films peeling off within the reduction zone of the drawing dies cannot be observed after testing of 2[Formula: see text]h. The abrasion ratio of boron and silicon-added diamond films is five times that of diamond films without any addition. Adding boron and/or silicon in the diamond films is proved to be an efficient way to obtain high-adhesive-strength and high-abrasion-resistance diamond-coated drawing dies.

Fabrication and Applications of Ultra-Smooth Composite Diamond Coated WC-Co Drawing Dies

2011 ◽  
Vol 175 ◽  
pp. 233-238 ◽  
Author(s):  
Bin Shen ◽  
Fang Hong Sun ◽  
Zhi Ming Zhang ◽  
He Sheng Shen ◽  
Song Shou Guo
Keyword(s):  
Chemical Vapor ◽  
X Ray Diffraction ◽  
Entry Zone ◽  
X Ray ◽  
Nano Crystalline ◽  
Composite Diamond ◽  
And Performance ◽  
Hot Filament ◽  
Drawing Dies

Micro/nano-crystalline multilayered ultra-smooth diamond (USCD) films are deposited on the interior-hole surface of conventional WC-Co drawing dies with a combined process consisting of the hot filament chemical vapor deposition (HFCVD) method and polishing technique. Scanning electron microscopy (SEM), surface profilemeter, Raman spectroscopy and X-ray diffraction (XRD) are employed to provide a characterization of as-deposited USCD films. The results exhibit that as-deposited USCD films present an ultra-smooth surface, its surface roughness values (Ra) in the entry zone, drawing zone and bearing zone are measured as 25.7 nm, 23.3 nm and 25.5 nm respectively. Furthermore, the working lifetime and performance of as-fabricated USCD coated drawing dies are examined in producing copper tubes with hollow sinking, fixed plug and floating plug. The results show that the lifetime of USCD coated drawing is as more than 30 times as that of WC-Co drawing dies in the drawing process with hollow sinking, 7 times in the fixed plug drawing and 10 times in the floating drawing.

Deposition and Application of CVD Diamond Film on the Interior-Hole Surface of Shaped-Wire Drawing Die

2012 ◽  
Vol 217-219 ◽  
pp. 1022-1027
Author(s):  
Liu Jin Bian ◽  
Zi Chao Lin ◽  
Fang Hong Sun ◽  
Song Shou Guo
Keyword(s):  
Surface Quality ◽  
Diamond Film ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Wire Drawing ◽  
Drawing Die ◽  
Before And After ◽  
Cvd Diamond Film ◽  
Drawing Dies

Abstract：The shaped-wire drawing dies are used more and more popularly in the metal product industry for several advantages of locked structure. In present investigation, a layer of CVD diamond film is deposited on the interior-hole surface of shaped-wire drawing die using a hot filament chemical vapor deposition (HFCVD) method, followed by a surface polishing process, aiming at further prolonging its working lifetime of shaped-wire drawing dies and improving the surface quality of produced wires. The scanning electron microscopy (SEM), surface profiler and Raman spectroscopy are adopted to present the characterization of both as-deposited CVD diamond films before and after polishing. Furthermore, the performance of as-fabricated CVD diamond coated drawing dies is examined in the practical production process. The results show that as-deposited CVD diamond films are homogeneous and the working surface is smoother after polishing. Comparing with the conventional shaped drawing dies, the working lifetime of the diamond coated shaped-wire drawing dies can be increased by a factor of above 10, and the shaped wires with higher surface quality can be obtained.

scholarly journals Lifetime in Steel Code Wire Drawing Dies of WC-Co Cemented Carbide Containing TaNbC or Cr3C2

2017 ◽  
Vol 64 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Masayuki TAKADA ◽  
Hideaki MATSUBARA ◽  
Yoshihiro KAWAGISHI
Keyword(s):  
Wire Drawing ◽  
Cemented Carbide ◽  
Drawing Dies

Fabrication and Application of CVD Diamond-Coated Copper Wire Drawing Die

2011 ◽  
Vol 328-330 ◽  
pp. 1182-1187 ◽  
Author(s):  
Qing Shun Tang ◽  
Yuan Hui Yang
Keyword(s):  
Surface Quality ◽  
Diamond Film ◽  
Copper Wire ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Cvd Diamond ◽  
Wire Drawing ◽  
Coating Film ◽  
Drawing Die ◽  
Coated Wire

To improve the surface quality and adhesion of diamond film is the key factors to realize CVD diamond coating widely applied in the wear-resistance parts field. Through optimizing deposition process parameters, the article used the straight wiredrawing chemical vapor deposition to depose the diamond film in the bore surface of WC-CO carbide wiredrawing mould. The surface topography of the coating, film quality and surface roughness were detected and the preparation of CVD diamond film coated wire drawing mould in drawing copper wires production line was applied. The experimental results show that working life of diamond film coated wire drawing mould improved to 40~ 50 of that traditional hard alloy mould, and the controlled copper wire had the better precision and surface quality.

Simulation of Temperature Distribution in HFCVD Diamond Films Growth on WC-Co Drill Tools in Large Quantities

2013 ◽  
Vol 589-590 ◽  
pp. 399-404 ◽  
Author(s):  
Lei Cheng ◽  
Jian Guo Zhang ◽  
Xin Chang Wang ◽  
Tao Zhang ◽  
Bin Shen ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Temperature Data ◽  
Diamond Coating ◽  
Substrate Distance ◽  
Complex Shapes ◽  
Simulation Results ◽  
Volume Method ◽  
Hot Filament

The substrate temperature distribution in hot filament chemical vapor deposition (HFCVD) diamond films growth on drill tools in large quantities are simulated by the finite volume method (FVM), adopting a detailed 3-D computational model corresponding with the actual reactor. Firstly, the correctness of the simulation model is verified by comparing the temperature data obtained from the simulation with that measured in an actual depositing process, and the results show that the error between them is less than 3%. Thereafter, the influences of several parameters are studied, including the filament separation (D), the length of the filament (L) and the filament-substrate distance (H). The simulation results show the three parameters have different effects on the distribution of temperature field. The influence of D is the greatest, L is followed and then H. The simulation has important theoretical guidance on both the development of HFCVD deposition equipment using for the diamond coating on tools with complex shapes in large quantities and the research of related production process.

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