Shanghai Jiaoyou Diamond Coating Co.

Shanghai, China

Shanghai Jiaoyou Diamond Coating Co.

Shanghai, China
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Shen B.,Shanghai JiaoTong University | Sun F.H.,Shanghai JiaoTong University | Zhang Z.M.,Shanghai Jiao You Diamond Coating Co
Key Engineering Materials | Year: 2011

The tribological performance of conventional microcrystalline diamond (MCD) film and diamond-like carbon (DLC) film is investigated comparatively under water lubricating condition. The MCD and DLC film are deposited on cobalt cemented tungsten carbide (WC-Co) substrate using the hot filament chemical vapor deposition (HFCVD) method and the vacuum arc discharge with a graphite cathode respectively. Scanning electron microscopy (SEM), white light interferometer, and Raman spectra are employed to characterize as-deposited MCD and DLC samples. The friction tests are carried out on a ball-on-plate reciprocating friction tester, where the sliding process is conducted under water lubricating condition. Silicon nitride, tungsten carbide, ball-bearing steel and copper are used as counterpart materials. The results indicate that DLC film always exhibits lower friction coefficient than MCD film under water lubricating condition, except the case of sliding against the silicon nitride, in which DLC film is worn out very rapidly and thus leads to the high friction coefficient. The wear resistance of DLC film under water lubricating condition is significantly poorer than that of MCD film. While sliding against silicon nitride, tungsten carbide, ball-bearing steel and copper, its wear rate is calculated as 3.67×10-7 mm3N-1m -1, 9.31×10-9 mm3N-1m -1, 3.54×10-7 mm3N-1m -1, and 4.97×10-8 mm3N-1m -1 respectively. Comparatively, no measurable wear track can be found on the worn surface of MCD films. © (2011) Trans Tech Publications.


Shen B.,Shanghai JiaoTong University | Sun F.,Shanghai Jiao You Diamond Coating Co
Solid State Phenomena | Year: 2011

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 .© (2011) Trans Tech Publications, Switzerland.


Lin Z.,Shanghai JiaoTong University | Shen B.,Shanghai JiaoTong University | Sun F.,Shanghai JiaoTong University | Zhang Z.,Shanghai Jiaoyou Diamond Coating Co. | Guo S.,Shanghai Jiaoyou Diamond Coating Co.
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture | Year: 2014

Diamond-coated drawing dies are considered as the next generation of drawing dies for their unique characteristics, such as high hardness, wear resistance, low friction and thermal conductivity in the cold drawing process. In order to utilize the superior characteristics of diamond coatings toward improving the drawing performance, modified typed drawing die is developed to minimize the diameter shrinkage. Finite element model simulation is used to simulate the low carbon steel tube sinking drawing process, using a two-dimensional axi-symmetric elastic-plastic element model. The parameters of tube drawing die, such as the main reduction zone α1, the semi-angle of the secondary reduction zone α2 and the length of the secondary reduction zone L, are considered. Based on the simulation results, the cause of diameter shrinkage is studied. The influence of parameters of tube drawing dies on the diameter shrinkage is investigated using the response surface methodology. The gained equation reveals that L is the most significant parameter. © IMechE 2014.


Shen B.,Shanghai JiaoTong University | Sun F.-H.,Shanghai JiaoTong University | Zhang Z.-M.,Shanghai Jiaoyou Diamond Coating Co. | Shen H.-S.,Shanghai Jiaoyou Diamond Coating Co. | Guo S.-S.,Shanghai Jiaoyou Diamond Coating Co.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2013

A specific revised HFCVD apparatus and a novel process combining HFCVD and polishing technique were presented to deposit the micro- and nano-crystalline multilayered ultra-smooth diamond (USCD) film on the interior-hole surface of WC-Co drawing dies with aperture ranging from d1.0 mm to 60 mm. Characterization results indicate that the surface roughness values (Ra) in the entry zone, drawing zone and bearing zone of as-fabricated USCD coated drawing die were measured as low as 25.7, 23.3 and 25.5 nm, respectively. Furthermore, the friction properties of USCD films were examined in both dry sliding and water-lubricating conditions, and the results show that the USCD film presents much superior friction properties. Its friction coefficients against ball-bearing steel, copper and silicon nitride balls (d4 mm), is always lower than that of microcrystalline diamond (MCD) or WC-Co sample, regardless of the lubricating condition. Meanwhile, it still presents competitive wear resistance with the MCD films. Finally, the working lifetime and performance of as-fabricated USCD coated drawing dies were examined under producing low-carbon steel pipes in dry-sliding and water-lubricating conditions. Under the water-lubricating drawing condition, its production significantly increases by about 20 times compared with the conventional WC-Co drawing dies. © 2013 The Nonferrous Metals Society of China.


Wang X.C.,Shanghai JiaoTong University | Shen B.,Shanghai JiaoTong University | Sun F.H.,Shanghai JiaoTong University | Zhang Z.M.,Shanghai Jiaoyou Diamond Coating Co. | And 2 more authors.
Key Engineering Materials | Year: 2012

Silicon carbide (SiC) is a promising material for fabricating wire compacting dies due to its advantages of light weight and even high wear resistance over the tungsten carbide, which currently is the most popular material used to produce compacting dies. In present study, a layer of CVD diamond film is deposited on the interior-hole surface of compacting dies using the hot filament chemical vapor deposition (HFCVD) method, following by a surface polish process, aiming at further elongating the lifetime of compacting dies and improving the surface quality of produced wires. The characterization of both as-deposited and polished CVD diamond films is employed by scanning electron microscopy (SEM), surface profiler, Raman spectroscopy and X-ray diffraction (XRD) spectroscopy. Furthermore, the performance of as-fabricated CVD diamond coated compacting dies is examined in the real production process. The results exhibit that the as-deposited CVD diamond films are homogeneous and their surface finish is significantly smoothened after the surface polish process. As compared with the conventional compacting dies, the working lifetime of the diamond coated SiC compacting dies can be increased by a factor of above 15 and in the course of processing, copper stranded wires with high surface quality and uniform sectional area can be obtained. © (2012) Trans Tech Publications, Switzerland.


Bian L.J.,Shanghai JiaoTong University | Lin Z.C.,Shanghai JiaoTong University | Sun F.H.,Shanghai JiaoTong University | Guo S.S.,Shanghai Jiaoyou Diamond Coating Co.
Applied Mechanics and Materials | Year: 2012

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. © (2012) Trans Tech Publications, Switzerland.


Lin Z.,Shanghai JiaoTong University | Shen B.,Shanghai JiaoTong University | Sun F.,Shanghai JiaoTong University | Zhang Z.,Shanghai Jiaoyou Diamond Coating Co. | Guo S.,Shanghai Jiaoyou Diamond Coating Co.
International Journal of Advanced Manufacturing Technology | Year: 2014

Trapezoidal-shaped aluminium wires are in demand for the production of the aluminium conductor steel supported/trapezoidal wire (ACSS/TW) conductor. In this work, it is proposed to manufacture such wires by a multi-pass cold drawing process using a series of shaped dies with an initial aluminium wire, which has an outer diameter of 9.5 mm. The ruled surface partition method is introduced to design the intermediate die profile of the multi-pass cold drawing. It is possible to design the intermediate die profile efficiently according to the suggested reduction ratio and save time regardless of the geometric complexity. A multi-pass drawing machine and a universal testing machine are both used to investigate the drawing process of trapezoidal-shaped aluminium wires. Wire break occurs when a five-pass drawing process is introduced. The six-pass drawing process is suggested to apply in a consideration of die cost. The final production has a good surface finish and a dimensional accuracy, suitable for the production of the ACSS/TW conductor. A finite element method (FEM) simulation approach is used to analyse stress and drawing force for the proposed process. The Von Mises stress values gradually increases and the drawing force values decrease along the pass schedule. The influence of the number of the drawing passes is numerically assessed. The drawing force value and the Von Mises stress value are lower when the number of dies is larger. The numerical compute drawing force of the six-pass drawing process is compared with the experimental ones. A good agreement between the predicted and experimental results can be observed. © 2014, Springer-Verlag London.


Lin Z.,Shanghai JiaoTong University | Shen B.,Shanghai JiaoTong University | Sun F.,Shanghai JiaoTong University | Zhang Z.,Shanghai Jiaoyou Diamond Coating Co. | Guo S.,Shanghai Jiaoyou Diamond Coating Co.
Advanced Materials Research | Year: 2012

Diamond-coated drawing dies are considered as ideal drawing dies for their unique characteristics, such as high hardness, wear resistance and low friction. In order to utilize the superior characteristics of diamond coatings towards improving the drawing performance, the nonlinear FEM simulation is used to simulate the whole stainless steel tube hollow sinking process, with 2D axi-symmetric elastic-plastic element. Based on the simulation results, the distributions of the axial stress and radial stress are analyzed, the influence of parameters of drawing dies on the diameter shrinkage is investigated. Optimal die parameters are obtained. © (2012) Trans Tech Publications, Switzerland.


Lin Z.C.,Shanghai JiaoTong University | Sun F.H.,Shanghai JiaoTong University | Zhang Z.M.,Shanghai Jiaoyou Diamond Coating Co. | Shen H.S.,Shanghai Jiaoyou Diamond Coating Co. | Guo S.S.,Shanghai Jiaoyou Diamond Coating Co.
Materials Science Forum | Year: 2014

Diamond-coated drawing dies are considered as ideal drawing dies for their unique characteristics, such as high hardness, wear resistance and low friction. To utilize the superior characteristics of diamond coatings, the FEM simulation is used to simulate the copper strip cold drawing process. The stress and the drawing load are predicted. The influence of parameters of drawing process on the drawing load is investigated. The optimal parameters are obtained. © (2014) Trans Tech Publications, Switzerland.


Wang X.-C.,Shanghai JiaoTong University | Sun F.-H.,Shanghai JiaoTong University | Shen B.,Shanghai JiaoTong University | Peng D.-H.,Shanghai Research Institute of Chemical Industry | Zhang Z.-M.,Shanghai Jiaoyou Diamond Coating Co.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2011

Relief valves used in the coal liquefaction equipment are running in an extremely harsh environment. Diamond film is potentially used as wear-resistant and protective coating for the relief valve components due to its outstanding mechanical and tribological properties. A layer of high-quality diamond film is deposited on the working surface of conventional WC-Co cemented carbide relief valve spool and valve seat, using the hot filament chemical vapor deposition (HFCVD) technique, with two different types of hot filament arrangements. The fabricated CVD diamond coated relief valve components are characterized using scanning electron microscope (SEM), X-ray diffraction spectroscopy (XRD), and Raman spectroscopy. The results exhibit that a layer of continuous, homogeneous diamond films(3~5 μm) has been deposited. Furthermore, the performance of fabricated relief valve components is evaluated under actual working conditions and the working lifetime is largely elongated up to 1200 hours, as more than three times as that of conventional relief valve components.

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