Wyniki wyszukiwania - BazTech

1

Multi-objective decision making for Z Coordinator and overcut in μ - EDM process using tungsten carbide electrode for machining of titanium alloy

Nguyen Phan-Huu

Journal of Machine Engineering

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2022

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Vol. 22, No. 1

138--149

EN

Research on optimization of technological parameters in micro-EDM is very important, and especially results in multi-objective optimization problem. It led to improve machining performance like machining accuracy, reduced electrode wear and improved surface quality. Recent studies mainly refer to the quality indicators of machining productivity and electrode wear, besides that machining accuracy and surface quality are also very important indicators but published results about them is very limited. In this study, Z Co-Ordinate (Z) and overcut (OC) in micro-EDM using tungsten carbide (WC) electrode for Ti-6Al-4V were decided simultaneously by TOPSIS. Technological parameters which include Voltage (V), Capacitance (C) and Response surface methodology (RSM) were investigated in the presented research work. The results showed that the quality parameters Z and OC at optimal conditions were significantly improved. The surface quality behind the micro-EDM is also analyzed and evaluated, and it is good.

2

On Micromachining with a Focus on Miniature Gears by Non Conventional Processes. A Status Report

Chaudhary T., Siddiquee A. N., Chanda A. K., Khan Z. A.

Archive of Mechanical Engineering

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2018

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Vol. LXV, nr 1

129--169

EN

Recent developments in automation and technology have revolutionized the way products are made. It is directly seen in the evolution of part miniaturization in the sectors such as aerospace, electronics, biomedicine and medical implants. Micromachining is a promising technology to fulfill the need of miniaturization. A review has been done on the micromachining processes such as micro electric discharge machining (micro-EDM) and wire EDM (WEDM), micro electrochemical machining (micro-ECM). Recent literature were studied and categorized in terms of materials, process parameters, performances, product manufactured, and miniature product generation. Starting with brief introduction to micromachining, classifications and applications, technical aspects of discussions from the literature have been presented on key factors such as parameters and the response variables. Important aspects of recast layer, heat effected zone, micro-hardness, micro cracks, residual stress, etc., have been given. A special focus is given to the status of the research on microgear manufacturing. Comparison has been made between other conventional process suitable for micro-gear manufacturing and WEDM. The miniature gear machined by WEDM shows the defect-free microstructure, better surface finish, thin recast layer and improved gear quality parameters such as profile and pitch. Finally, the research gaps and future research directions have been presented.

3

Wybrane zagadnienia z badań nad zastosowaniem włókien węglowych jako elektrod narzędziowych w mikroobróbce elektroerozyjnej

Trych-Wildner A.

Mechanik

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2015

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R. 88, nr 12CD1

1--4

PL

W artykule przedstawiono wybrane zagadnienia z badań nad zastosowaniem włókien węglowych jako elektrod narzędziowych w mikroobróbce elektroerozyjnej. Jest to materiał dotychczas nie używany na elektrody w tym zastosowaniu. W artykule opisano specjalne stanowiska, zaprojektowane do przeprowadzenia eksperymentów oraz metodykę prowadzenia badań. Zaprezentowano również rezultaty drążenia mikrootworów oraz scharakteryzowano geometrię tak otrzymanych wgłębień.

EN

In this article selected issues describing an utilisation of carbon fibres as tool electrodes in microelectrical discharge machining were presented. Carbon fibres have not been previously used in such application. The paper presents an experimental setup designed to perform the experiments and the methodology of the tests. Then microholes obtained in this process were presented and their geometry was characterised.

4

Włókna węglowe pokryte niklem w funkcji elektrod narzędziowych w mikroobróbce elektroerozyjnej

Trych A.

Mechanik

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2015

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R. 88 nr 4CD

98--101

PL

W artykule przedstawiono zastosowanie włókien węglowych z dodatkowym pokryciem niklowym jako elektrod narzędziowych w mikroobróbce elektroerozyjnej. Omówiono specjalną konstrukcję i technologię elektrod, których średnice mają ok. 7,5 μm. Przedstawiono również opis stanowiska do badań i metodykę prowadzenia eksperymentów. Opisano eksperymenty mające na celu analizę zużycia elektrod w zależności od parametrów procesu mikroobróbki elektroerozyjnej. Następnie porównano wyniki z danymi otrzymanymi na podstawie eksperymentów dotyczących włókien bez pokrycia.

EN

Within this work carbon fibres covered with thin nickel layer were used as tool electrodes in micro electrical discharge machining. The special design and technology of such electrodes with 7.5 μm diameter were described. The experimental setup was also introduced with the methodology of experiments. Experiments analysing wear of electrodes according to input parameters were discussed. Then, they were compared with results obtained from experiments with carbon fibres without nickel coating.

5

Idea of the experimental stand for micro-electrical discharge machining using carbon fibres as the tool electrodes

Trych A., Markiewicz S.

Journal of Machine Engineering

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2012

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Vol. 12, No. 2

105--110

EN

The paper deals with the idea and design solutions for a special experimental stand and consequently a preliminary study of the future machine tool for micro-electrical discharge machining with carbon fibre as tool electrodes. The main requirements are introduced and, particularly for such purpose unusual conditions that must be assured are presented. Solutions that were used as well as some initial concepts are discussed and assessed. The paper is enriched with an extensive illustrative material of designed solutions for each important part responsible for the proper functioning of the respective components. The evaluation of existing solutions as well as the further issues that must be developed are analyzed.