Research on NC Electrochemical Mechanical Drilling

2012 ◽  
Vol 271-272 ◽  
pp. 476-482
Author(s):  
Wei Min Gan ◽  
Bo Xu ◽  
Zhi Fang Zhao
Keyword(s):  
Stainless Steel ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
High Temperature Alloy ◽  
Mechanical Grinding ◽  
High Quality ◽  
Taper Angle ◽  
Composite Cathodes ◽  
High Efficient ◽  
Drilling Method

NC electrochemical mechanical drilling was based on NC, Electrochemical machining and mechanical grinding. It drilled with different diameter composite cathodes. This kind of drilling method took the advantages of electrochemical mechanical, so it was not restricted by parts’ strength, hardness and stiffness. The cover of cathode ensured the drilling precision. So this technology should be studied. This paper took 304 stainless steel and high temperature alloy GH710 to do study, at last the reasonable and high efficient process parameters were found in the experiment. The high quality holes of better roundness and small taper angle were drilled. The results showed that the study of NC electrochemical mechanical drilling difficult-to-machine materials was very meaningful.

Technology of Electrochemical Micromachining Based on Surface Modification by Fiber Laser on Stainless Steel

2017 ◽  
Vol 909 ◽  
pp. 67-72
Author(s):  
Xiao Hai Li ◽  
Shu Ming Wang ◽  
Bei Bei Xue
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Fiber Laser ◽  
Laser Scanning ◽  
Complex Structure ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
Electrochemical Micromachining ◽  
Micro Machining ◽  
Micro Cavity

In order to fabricate the micro cavity with complex structure on stainless steel, the technology of micro electrochemical machining based on surface modification by fiber laser is adopted. Heating scan on the surface of 304 stainless steel by using fiber laser can realize marking. In the process of laser heating and metal melting on the surface of 304 stainless steel, oxide layer can be formed and phase transformation can also occur, and the corrosion resistance layer with predefined pattern is formed. In the next process of micro electrochemical machining, the laser masking layer severs as the protective layer to realize micro machining of micro cavity. A newly developed device of electrochemical micro machining based on surface modification by fiber laser can meet the micro machining requirement. After laser masking processing through laser scanning on the surface of the 304 stainless steel, the passivation electrolyte and high-frequence-pulse electrochemical machining power supply were adopted, and the samples with typical structures by using electrochemical micromachining with fiber laser masking were fabricated.

On the Deep Small Hole Machining Method of Nickel-Based High-Temperature Alloy

2011 ◽  
Vol 199-200 ◽  
pp. 1874-1879
Author(s):  
Shi Chun Di ◽  
Zhao Long Li ◽  
Dong Bo Wei
Keyword(s):  
High Temperature ◽  
Electrochemical Machining ◽  
Machining Process ◽  
Speed Ratio ◽  
High Temperature Alloy ◽  
Technological Parameters ◽  
High Quality ◽  
Radial Overcut ◽  
The Mathematical Model ◽  
Hole Machining

In this paper, a machining method of deep hole on the nickel-based high-temperature alloy using the pulse electrochemical machining is proposed. The effect of five technological parameters on the depth-averaged radial overcut of the hole to be machined in the machining process is discussed; then the mathematical model is built, and the effect of parameters on the overcut is illustrated. The speed ratio is determined to judge the quality and the processing performance of holes. The technological parameters adopted in the experiment, can be used to produce effectively high-quality hole of big proportion of depth to diameter on the nickel-based high-temperature alloy in the machining process.

scholarly journals Study on Ultrasonic Assisted Electrochemical Drill-Grinding of Superalloy

Chemosensors ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 62
Author(s):  
Huanghai Kong ◽  
Yong Liu ◽  
Xiangming Zhu ◽  
Tengfei Peng
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
High Speed ◽  
Electrochemical Machining ◽  
Machining Parameters ◽  
Mechanical Grinding ◽  
High Quality ◽  
Passive Behavior ◽  
Ultrasonic Assisted ◽  
Small Holes

Electrochemical grinding (ECG) technique composed of electrochemical machining (ECM) and mechanical grinding is a proper method for machining of difficult-to-cut alloys. This paper presents a new ultrasonic assisted electrochemical drill-grinding (UAECDG) technique which combines electrochemical drilling, mechanical grinding, and ultrasonic vibration to fabricating high-quality small holes on superalloy. By applying ultrasonic vibration to high-speed rotating electrode in ECG, machining stability, efficiency, and surface quality can be obviously improved. Firstly, the electrochemical passive behavior of superalloy is studied, the mathematical model and simulation of gap electric field are established. Then, several experiments are conducted to investigate the influence of applied voltage, feed rate and ultrasonic amplitude on the machining quality. The balance of material removal between electrochemical reaction and mechanical grinding is achieved by optimizing the machining parameters. It reveals that the surface quality as well as machining stability and efficiency can be significantly improved by applying rotating ultrasonic vibration to the ECG process. Finally, several small holes of high quality have been machined successfully along with surface roughness of hole sidewall decreases from Ra 0.99 μm to Ra 0.14 μm by UAECDG.

Preparation of cell adhesive micropores by one-step potentiostatic polarization on 304 stainless steel

2018 ◽  
Vol 233 (8) ◽  
pp. 1914-1919 ◽  
Author(s):  
Yu Li ◽  
Lei Guan ◽  
Hongyu Wei ◽  
Zhongning Guo ◽  
Guan Wang
Keyword(s):  
Stainless Steel ◽  
Cell Density ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
Machining Accuracy ◽  
Machining Parameters ◽  
Machining Time ◽  
Cell Adhesive ◽  
One Step ◽  
Potentiostatic Polarization

Non-conventional electrochemical machining in micro-manufacturing has atomic-scale machining accuracy only in theory. By taking full advantage of the material heterogeneity, the micropores which most easily initiate at the surface stoichiometric inhomogeneities for stainless steel can be prospectively obtained with the size kept under control by adjusting the machining parameters. Taking the economy and efficiency into account, a one-step potentiostatic polarization method was established. Optimization of the machining parameters for achievement of microporous structure required by cell adhesive surface on 304 stainless steel in natural 15 wt% NaNO3 solution was confirmed. Based on the potentiodynamic polarization curve, a DC voltage of 5 V in the region of secondary passivation was selected due to the porous secondary passivation film which results in the initiation of large amounts of pores. The effects of the machining time on the pore size, coverage ratio, density, unevenness degree and adhesive cell density on the porous surface were investigated through statistical analysis. The results show that there is a maximum value of machining time, tm, when the surface has a maximum pore density, and minimum pore unevenness degree. Meanwhile, adhesive cell density increases to significant level at tm then levels off over time. Therefore, this approach has been testified possible through the novel use of material microdefects and electrochemical machining to obtain cell adhesive micropores.

Research on Micro Electrochemical Machining Based on Multifunction Machine Tool

2009 ◽  
Vol 628-629 ◽  
pp. 399-404
Author(s):  
Xiao Hai Li ◽  
Li Jie Zhao ◽  
Xin Rong Wang ◽  
X. Zhang ◽  
Zhen Long Wang
Keyword(s):  
Stainless Steel ◽  
High Speed ◽  
Short Pulse ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
Tool Electrode ◽  
Electrode Gap ◽  
Micro Ecm ◽  
Gap Control ◽  
Ultra Short Pulse

The research aims to develop an experimental equipment to carry out in depth research on micro electrochemical machining (micro-ECM). The mechanisms of ultra-short pulse current micro ECM are discussed. As a consequence, lower machining voltage, lower passivity electrolyte concentration, high frequency short pulse power supply and micro rotating tool electrode at high speed have been synthetically used to localize the dissolution area during micro-ECM. The machining gap can be kept at a very small value, and the better resolution of machined shape is achieved by using a novel designed electrode gap control system and the effective utilization of ECM for micromachining is fulfilled. The experiments on microstructure by micro-ECM milling on stainless steel plate are conducted. The micro structures milled on 304 stainless steel foil with 300μm thickness with high precision and high aspect ratio are achieved, and the width of micro beam is about 60μm.

scholarly journals Experimental Study on the Influence of Tool Electrode Material on Electrochemical Micromachining of 304 Stainless Steel

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2311
Author(s):  
Jianxiao Bian ◽  
Baoji Ma ◽  
Haihong Ai ◽  
Lijun Qi
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Material Removal ◽  
Removal Rate ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
Aluminum Alloy 6061 ◽  
Thin Walled ◽  
Alloy 6061 ◽  
Tungsten Steel

Different cathode materials have different surface chemical components and machining capacities, which may finally result in different machining quality and machining efficiency of workpieces. In this paper, in order to investigate the influence of cathode materials on the electrochemical machining of thin-walled workpiece made of 304 stainless steel, five cylindrical electrodes are used as the target working cathodes of electrochemical machining to conduct experiments and research, including 45# steel, 304 stainless steel, aluminum alloy 6061, brass H62, and tungsten steel YK15. The stray current corrosion, taper, and material removal rate were used as the criteria to evaluate the drilling quality of efficiency of a thin-walled workpiece made of 304 stainless steel. The research results show that from the perspectives of stray current corrosion and taper, aluminum alloy 6061 is an optimal tool cathode, which should be used in the electrochemical machining of thin-walled workpieces made of 304 stainless steel; on the aspect of material removal rate, the 45# steel, 304 stainless steel, and aluminum alloy 6061 present close material removal rates, all of which are higher than that of brass H62 and tungsten steel YK15. Based on comprehensive consideration of both machining quality and machining efficiency, the aluminum alloy 6061 is the best option as the cathode tool in the electrochemical machining of thin-walled workpieces made of 304 stainless steel.

Comparison of Recovery and Recrystallization in Stainless Steel Following Plane-Wave Shock Loading and Explosive Forming

1970 ◽  
Vol 28 ◽  
pp. 428-429 ◽  
Author(s):  
J. A. Korbonski ◽  
L. E. Murr
Keyword(s):  
Stainless Steel ◽  
Shock Loading ◽  
Pressure Pulse ◽  
Shock Pressure ◽  
304 Stainless Steel ◽  
Strain Rates ◽  
Two Dimensional ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Explosive Forming

Comparison of recovery rates in materials deformed by a unidimensional and two dimensional strains at strain rates in excess of 104 sec.−1 was performed on AISI 304 Stainless Steel. A number of unidirectionally strained foil samples were deformed by shock waves at graduated pressure levels as described by Murr and Grace. The two dimensionally strained foil samples were obtained from radially expanded cylinders by a constant shock pressure pulse and graduated strain as described by Foitz, et al.

Pyrolytic carbon filaments and associated catalytic particles formed in steel tubes

1984 ◽  
Vol 42 ◽  
pp. 662-663
Author(s):  
Y. L. Chen ◽  
J. R. Bradley
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Catalyst Particle ◽  
Pyrolytic Carbon ◽  
Plain Carbon Steel ◽  
304 Stainless Steel ◽  
Hydrocarbon Gases ◽  
Steel Tubes ◽  
Filamentous Carbon ◽  
Carbon Filaments

Considerable effort has been directed toward an improved understanding of the production of the strong and stiff ∼ 1-20 μm diameter pyrolytic carbon fibers of the type reported by Koyama and, more recently, by Tibbetts. These macroscopic fibers are produced when pyrolytic carbon filaments (∼ 0.1 μm or less in diameter) are thickened by deposition of carbon during thermal decomposition of hydrocarbon gases. Each such precursor filament normally lengthens in association with an attached catalyst particle. The subject of filamentous carbon formation and much of the work on characterization of the catalyst particles have been reviewed thoroughly by Baker and Harris. However, identification of the catalyst particles remains a problem of continuing interest. The purpose of this work was to characterize the microstructure of the pyrolytic carbon filaments and the catalyst particles formed inside stainless steel and plain carbon steel tubes. For the present study, natural gas (∼; 97 % methane) was passed through type 304 stainless steel and SAE 1020 plain carbon steel tubes at 1240°K.

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