Workpiece vibration in feed direction assisted electrochemical cutting using tube electrode with inclined holes

Abstract Electrochemical cutting using tube electrode with inclined holes is a machining method that directly and obliquely injects electrolyte into the machining gap through inclined jet-flow holes on the sidewall of a tube electrode, allowing the electrochemical cutting of a workpiece. To improve the machining efficiency and accuracy of this cutting technique, a method of workpiece vibration in feed direction assisted electrochemical cutting is proposed in which workpiece vibration along the feed direction rapidly and periodically changes the machining gap. The near-instantaneous increases in the machining gap promotes the waste electrolyte containing electrolytic products to flow down the machining gap. At the same time, the electrochemical reaction time under the non-uniform flow field caused by the inclined downward injection of electrolyte is reduced. The flow field simulation of electrolyte in machining gap indicates that the near-instantaneous increases in the machining gap can improve the flow velocity of electrolyte. Experiment demonstrates that the average feed rate can be increased by 50% and the machining efficiency is superior to that of electrochemical cutting assisted by workpiece non-vibration in feed direction. The difference between the upper and lower slit widths is reduced and the machining accuracy is improved. The effect of the vibrational amplitude and frequency on the machining result is also investigated. Finally, an array slice structure is fabricated on a stainless steel block with a cross-section of 10 mm × 10 mm at average feed rate of 6 mm/s using a vibrational amplitude and frequency of 0.1 mm and 1.5 Hz, respectively.

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Fabrication and EDM Corrosion Resistance of Copper Electroforming Layer on Tube Electrode for Aero-Engine Blade Cooling Hole in EDM Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.764.133 ◽

2018 ◽

Vol 764 ◽

pp. 133-141 ◽

Cited By ~ 1

Author(s):

Zhi Yong Li ◽

Qing Wei Cui ◽

Bin Chen ◽

Ji Xu ◽

Hun Guo

Keyword(s):

Corrosion Resistance ◽

Loss Rate ◽

Pure Copper ◽

Blade Cooling ◽

Tube Electrode ◽

Aero Engine ◽

Engine Blade ◽

Cooling Hole ◽

Edm Process ◽

Main Material

The process parameters of fundamental electroforming solution were optimized firstly. Furthermore, some pure copper electroforming samples were prepared in the condition of different nana La2O3 addition quantity. Three main material properties evaluated. In addition, the EDM machining experiments were conducted to verify the characteristics of electrical corrosion resistance resulting from the prepared copper tube electroforming samples for cooling hole of Inconel718 nickel alloy. EDM experimental results demonstrate that copper electroforming layer with grain size 15.9μm, microhardness 98.2HV, with 1.2g/L addition quantity of nana La2O3, and its electrode loss rate decrease 13.29% and 7.26% than pure copper and copper electroforming layer without nana La2O3 addition respectively.

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The tube electrode and e.s.r.: Second order kinetics

Journal of Electroanalytical Chemistry ◽

10.1016/s0022-0728(77)80085-5 ◽

1977 ◽

Vol 75 (1) ◽

pp. 229-239 ◽

Cited By ~ 27

Author(s):

W. John Albery ◽

Andrew T. Chadwick ◽

Barry A. Coles ◽

Noel A. Hampson

Keyword(s):

Second Order ◽

Tube Electrode

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Surface Roughness Analysis for Radius End Mill in Cross Feed Direction Both Contour and Scanning Line Machinings

JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing ◽

10.1115/lemp2020-8575 ◽

2020 ◽

Author(s):

Hirohisa Narita

Keyword(s):

Surface Roughness ◽

Inclination Angle ◽

End Milling ◽

Contour Line ◽

End Mill ◽

Good Surface ◽

Corner Radius ◽

Feed Direction ◽

Scanning Line ◽

Influence Degree

Abstract An optimum experimental condition, which realize good surface roughness in cross direction both contour and scanning lines, for radius end mill against some inclined surfaces is obtained and some features is these cutting processes is discussed in this paper. The optimum experimental condition, which consists of cutting type (or feed direction), spindle speed, feed rate, depth of immersion, inclination angle, corner radius of end mill and cross feed, is obtained and the influence degree of these parameters is calculated by using Taguchi method. The experiment is carried out based on L18 orthogonal array. Based on the influence degree and geometric contact status due to unique shape of radius end mill, some feature of radius end milling is introduced. As a result of the contour line machining, a scallop height is very influenced by the inclination angle and the corner radius, and surface machined by bottom edge must not be remained. Regarding the scanning line machining, “go-up” is good for the feed direction. Big corner radius is also suitable because side edge does not contact to workpiece. In other words, the cutting force in radial direction becomes small. Furthermore, the surface roughness of the scanning line machining is smaller than the one of the contour line machining.

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A unique CEL numerical method on material flow in a molten pool of workpiece vibration assisted welding

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY ◽

10.2207/qjjws.38.54s ◽

2020 ◽

Vol 38 (2) ◽

pp. 54s-58s

Author(s):

Habib Hamed Zargari ◽

Kazuhiro Ito ◽

Yoshiki Mikami ◽

Abhay Sharma

Keyword(s):

Numerical Method ◽

Material Flow ◽

Molten Pool ◽

Workpiece Vibration

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Study on Generating Machining Performance of Two-Dimensional Ultrasonic Vibration-Composited Electrolysis/Electro-Discharge Technology for MMCs

Materials ◽

10.3390/ma15020617 ◽

2022 ◽

Vol 15 (2) ◽

pp. 617

Author(s):

Jing Li ◽

Wanwan Chen ◽

Yongwei Zhu

Keyword(s):

Ultrasonic Vibration ◽

Orthogonal Experiment ◽

Spindle Speed ◽

Machining Efficiency ◽

Matrix Composites ◽

Two Dimensional ◽

Machining Performance ◽

Factors Affecting ◽

Electro Discharge Machining ◽

Workpiece Vibration

Ultrasonic vibration-composited electrolysis/electro-discharge machining technology (UE/DM) is effective for machining particulate-reinforced metal matrix composites (MMCs). However, the vibration of the tool or workpiece suitable for holes limits the application of UE/DM. To improve the generating machining efficiency and quality of flat and curved surfaces, in this study, we implemented two-dimensional ultrasonic vibration into UE/DM and constructed a novel method named two-dimensional ultrasonic vibration-composited electrolysis/electro-discharge machining (2UE/DM). The influence of vibration on the performance of 2UE/DM compared to other process technologies was studied, and an orthogonal experiment was designed to optimize the parameters. The results indicated that the materiel remove rate (MRR) mainly increased via voltage and tool vibration. The change current was responsible for the MRR in the process. Spindle speed and workpiece vibration were not dominant factors affecting the MRR; the spindle speed and tool and workpiece vibration, which reduced the height difference between a ridge and crater caused by abrasive grinding, were responsible for surface roughness (Ra) and form precision (δ). Additionally, the optimized parameters of 1000 rpm, 3 V, and 5 um were conducted on MMCs of 40 SiCp/Al and achieved the maximum MRR and minimum Ra and δ of 0.76 mm3/min, 3.35 um, and 5.84%, respectively. This study’s findings provide valuable process parameters for improving machining efficiency and quality for MMCs of 2UE/DM.

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Results of selection work with grain crops in the subarctic zone of the Russian Federation

Agrarian science ◽

10.32634/0869-8155-2021-345-2-63-66 ◽

2021 ◽

pp. 63-66

Author(s):

O. B. Batakova ◽

V. A. Korelina ◽

I. V. Zobnina

Keyword(s):

Crop Production ◽

Spring Barley ◽

The State ◽

High Yield ◽

Winter Rye ◽

Grain Crops ◽

State Register ◽

Feed Direction ◽

Northern Regions ◽

The Russian Federation

Agriculture of the Northern regions specializes in animal husbandry, in this regard an urgent problem of crop production in the conditions of the Northern regions of the Russian Federation is the creation of precocious, high-yielding varieties of grain crops for fodder purposes. The article reflects the selection achievements in grain crops over the past seven years. The presented new varieties combine high yield, increased environmental plasticity, and have the ability to reduce their productivity to a lesser extent when cultivated in the harsh conditions of the Northern region. Breeding work conducted at the laboratory of crop production of the Primorskiy filial FGBUN FICKIA RAN - ArhNIISKH in 2005-2019, in breeding semipolar rotation in accordance with the "Guidelines on the selection of barley and oats" (2014), methodology of State Commission for testing of agricultural crops (1985). The digestibility of winter rye dry matter was determined by in vitro method on an artificial stomach. Statistical processing of experimental results was performed using the AGROS version 2.07 selection and genetic software package. Results of the study. As a result of selection work, precocious productive varieties of grain crops of the feed direction were bred and included in the state register. Bereginya — new-generation winter rye variety, universal use, with a low content of water-soluble pentosans in the grain. The variety has been included in the State register of selection achievements since 2013. Variety of spring barley Tausen — feed direction, resistant to environmental stress factors, high-yielding, resistant to lodging and pathogens (dusty smut, spotting). It has been included in the State register of selection achievements since 2014. Spring barley variety Kotlassky — feed direction precocious, productive, adaptive to adverse environmental factors, for obtaining concentrated feed for livestock and poultry. It has been included in the State register of breeding achievements since 2019. Arhan spring oat variety — environmentally plastic adapted to changes in soil and climate conditions, immune to dusty smut, combines a high yield of grain and green mass. Since 2020, it has been included in the State register of selection achievements.

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The Effects of Vibration and Pulsation on Metal Removal by a Plasma Torch

Journal of Heat Transfer ◽

10.1115/1.3450034 ◽

1973 ◽

Vol 95 (2) ◽

pp. 240-245 ◽

Cited By ~ 1

Author(s):

G. T. Dyos ◽

J. Lawton

Keyword(s):

Molten Metal ◽

Gas Flow ◽

Metal Removal ◽

Capillary Waves ◽

Plasma Jets ◽

Removal Rates ◽

Workpiece Vibration ◽

Arc Current ◽

Set Up ◽

Gas Pulsations

An experimental study has been carried out on the effects of workpiece vibration and gas pulsations on metal removal rates using plasma jets. In the case of workpiece vibration, increases in removal rates of up to 30 percent were found, which can be accounted for in terms of capillary waves set up in the melt. The influence of pulsation of gas flow velocity and arc current at modulation levels of 10 percent was found to be negligible. A theoretical model has been developed which explains the results in terms of the development of resonance capillary waves in the molten metal and predicts the average depth of the layer of molten metal.

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