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1

Środowiskowe aspekty obróbki elektroerozyjnej

Tadeusz Leppert

Obróbka Metalu

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2023

|

nr 4

34--43

PL

Obróbka elektroerozyjna (Electro-Discharge Machining . EDM) jest jednym z najbardziej rozpowszechnionych sposobów niekonwencjonalnego kształtowania przedmiotów, stosowanym do obróbki powierzchni o złożonych kształtach, zwłaszcza materiałów o dużej twardości i trudno skrawalnych. Z tego powodu zrozumiałe jest dążenie do zwiększania efektywności tej obróbki. Z drugiej strony, rosnące zainteresowanie wpływem ogółu procesów produkcyjnych na środowisko naturalne i zdrowie pracowników, spowodowało zintensyfikowanie badań zmierzających do opracowania nowych lub zmodyfikowanych sposobów obróbki EDM zmniejszających lub eliminujących ich negatywne oddziaływania środowiskowe. W artykule przedstawiono analizę czynników procesu drążenia elektroerozyjnego będących źródłem zagrożeń środowiskowych. Scharakteryzowano także podejmowane próby ich ograniczenia z zastosowaniem innowacyjnych rozwiązań technologicznych obróbki elektroerozyjnej.

EN

Electro-Discharge Machining (EDM) is one of the most common methods of unconventional forming of objects, used for surface treatment of complex shapes, especially materials with high hardness and difficult to machine. For this reason, it is understandable to seek to increase the efficiency of this treatment. On the other hand, the growing interest in the environmental and health impacts of production processes in general has led to an intensification of research into new or modified EDM treatments to reduce or eliminate their negative environmental impacts. In this paper there were presented an analysis of the EDM factors generating environmental risks and characterizes the attempts to limit their negative influence by introducing innovative EDM technologies.

2

Influence of EDM process parameters of novel Al7010/B4C/BN hybrid metal matrix nanocomposite

Dirisenapu Gopichand, Salavaravu Laxmanaraju, Dumpala Lingaraju

Composites Theory and Practice

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2023

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R. 23, nr 4

191--196

EN

In this present research work, the electrical discharge machining (EDM) characteristics of an Al7010/2%B4C/2%BN (the reinforcement particles are taken as wt.%) hybrid metal matrix nanocomposite (HMMNC) are discussed. The effect of the EDM process variables like the discharge current (I), pulse on time (Pon), pulse off time (Poff) and gap voltage (Vg) on the response characteristics like the material removal rate (MRR), tool wear rate (TWR), and surface roughness (SR) are presented. The results revealed that the MRR, TWR, and SR grew with an increase in Ip and Pon. MRR, TWR, and SR increased with a rise in Poff up to 25 μs then declined. MRR, TWR, and SR decreased with an increment in gap voltage. The highest MRR was observed for a discharge current of 8 A, Pon of 60 μs, Poff of 25 μs and Vg of 30 V. SR and TWR were the smallest at Ip of 2 A, Pon of 15 μs, Poff of 55 μs and Vg of 60 V. The scanning electron microscope (SEM) micrographs of the machined surfaces revealed voids, craters and micro cracks.

3

Multi-Response Optimization of Electrical Discharge Machining of 17-4 PH SS Using Taguchi-Based Grey Relational Analysis

Gerçekcioğlu Eyyup, Albaşkara Mehmed

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 3

861--868

EN

Multiple response optimization of the machining of 17-4 PH stainless steel material, which is difficult to process with traditional methods, with EDM was made by Taguchi-based grey relational analysis method. Surface roughness (Ra), material removal rate (MRR), and electrode wear rate (EWR) were the responses, while current, pulse-on time, pulse-off time, and voltage were chosen as process parameters. According to the multi-response optimization, the experiment level that gave the best result was A1B2C2D2. optimum machining outputs were found as A1B3C1D1 using the Taguchi method. As a result of the Taguchi analysis and ANOVA, it was determined that the significant parameters according to multiple performance characteristics were current (56.22%) and voltage (22.40%). The surfaces of the best GRG and optimal sample were examined with XRD, SEM and EDX analysis and the effects on the surfaces were compared.

4

Effects of EDM on the Chemical Composition and Microstructure of the Surface Layer of Alnico Alloys

Bańkowski Damian, Młynarczyk Piotr, Szwed Bartłomiej

Archives of Foundry Engineering

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2023

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Vol. 23, iss. 2

106--111

EN

This article deals with the effects of electrical discharge machining (EDM) on the chemical composition and microstructure of cast Alnico alloys, i.e., iron-based alloys composed of aluminum, nickel and cobalt. The experiments focused on determining the chemical composition of the surface layer before and after the EDM process. The microstructure of the material altered by the EDM was also examined. The study included measurement of the thickness of the white layer characteristic of EDM. It is evident that low values of the surface roughness parameters can be obtained by correctly selecting the EDM process parameters. The average surface roughness reported in the experiments was 1 μm. The surface roughness measurements were conducted with a Talysurf CCI lite non-contact profiler. The metrological results also indicate that lower surface roughness can be obtained at small discharge energies.

5

Electrodischarge and electrochemical grinding of special materials

Ruszaj Adam, Cygnar Mariusz, Furyk-Grabowska Karolina, Grabowski Marcin

Journal of Engineering, Energy and Informatics

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2022

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No. 1

51--62

EN

In Electrochemical Machining (ECM), material is removed “atom by atom” as the result of an electrochemical dissolution process. Under optimal parameters for this process the tool has no wear and the quality of the surface layer, metal removal rate and accuracy are satisfactory for special application in the automotive or aerospace industries. However, ECM has also some limitations connected with electrolyte flow through interelectrode gap, machined surface passivation phenomena or heat and hydrogen generation, quick temperature increase and high probability of electrical discharges and difficulties with machining composite materials. In Electrodischarge Machining (EDM), material from workpiece is removed during electrical discharges occurring in the machining area as a result of material melting, evaporating and sometimes breaking as a result of high internal stresses. This way of material removal introduces significant changes in surface layer properties and reaching a satisfactory surface layer roughness and high accuracy is possible only for a rather small metal removal rate. In order to overcome the above-mentioned problems, some hybrid abrasive ECM and EDM processes have been worked out and successfully applied in industry. Here, some results from the authors’ own research, industrial applications and data from the literature are presented.

PL

W obróbce elektrochemicznej (ECM) materiał usuwany jest „atom po atomie” w wyniku procesu roztwarzania elektrochemicznego. W procesie tym przy zastosowaniu optymalnych parametrów nie występuje zużycie narzędzia, a jakość warstwy wierzchniej, prędkość usuwania materiału oraz dokładność są zadowalające dla specjalnych zastosowań w przemyśle samochodowym, lotniczym i kosmicznym. Obróbka ECM posiada też pewne ograniczenia związane z przepływem elektrolitu przez szczelinę międzyelektrodową, zjawiskami pasywacji obrabianej powierzchni, generowaniem ciepła oraz wodoru, szybkim wzrostem temperatury i dużym prawdopodobieństwem wyładowań elektrycznych oraz trudnościami w obróbce materiałów kompozytowych. W obróbce elektroerozyjnej (EDM) ubytek materiału z przedmiotu obrabianego realizowany jest podczas wyładowań elektrycznych występujących w obszarze obróbki w wyniku topienia, parowania, a czasem pękania materiału w wyniku dużych naprężeń wewnętrznych. Taki sposób usuwania materiału wprowadza znaczące zmiany właściwości warstwy wierzchniej, a osiągnięcie zadowalającej chropowatości warstwy wierzchniej i wysokiej dokładności obróbki jest możliwe przy stosunkowo niewielkiej prędkości usuwania materiału. W celu przezwyciężenia powyższych problemów, opracowano i z powodzeniem zastosowano w przemyśle hybrydowe procesy ścierne ECM oraz EDM. Poniżej przedstawiono wybrane wyniki badań własnych autorów, jak również zastosowania przemysłowe oraz dane literaturowe.

6

Evaluation of dimensional accuracy and surface integrity of cylindrical array microelectrodes and cylindrical array microholes machined by EDM

Sun Yao, Gong Yadong, Wen Xuelong, Xin Bo, Yin Guoqiang, Meng Fantao, Tang Benjia

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 1

art. no. e46, 2022

EN

In this study, the loss self-finishing method based on EDM reverse copy principle was proposed aiming to enhance the prepared efficiency of cylindrical array microholes. First, the effects of geometric parameters of microelectrodes on the diameter consistent error, inlet and outlet deviation, section profile, surface roughness parameters and the heat affected zone thickness were quantitatively investigated. The forming accuracy of cylindrical array microelectrodes obtained by self-finishing and multi-finishing methods were contrastively analyzed. Furthermore, 8 × 8 cylindrical array microelectrodes with diameter of about 185.18 μm and length of 2168.79 μm were fabricated by the loss self-finishing method for the first time. Besides, the size accuracy, surface morphology and surface roughness parameters of cylindrical array microholes machined using array microelectrodes prepared by loss self-finishing method were evaluated. Experimental results disclosed that the average consistent errors of inlet and outlet diameter for cylindrical array microholes, respectively, were 1.495 μm and 3.13 μm, indicating that the cylindrical array microelectrodes obtained by loss self-finishing method are capable to manufacture cylindrical array microholes with good surface quality and high dimensional accuracy.

7

Optimization of Output Responses during EDM of AZ91 Magnesium Alloy using Grey Relational Analysis and TOPSIS

Tajdeen A., Megalingam A.

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 4

1105--1113

EN

Unconventional machining of magnesium alloys through die sinking and Wire Electrical Discharge Machining (WEDM) processes are preferred over conventional machining processes to overcome the rapid loss in strength and affinity that occurs with tool materials at high temperatures. in the present study, AZ91 magnesium alloy is machined in EDM using a prepared alloy tool (copper alloyed with titanium diboride). Based on Taguchi’s L27 orthogonal array, a total of 27 experiments have been conducted by varying the process parameters such as pulse on time (Ton), gap voltage (Vg) and current (Ip) with three different levels. Techniques for Order Preference by Similarity to Ideal Solution (TOPSIS) and Grey Relational Analysis (GRA) have been applied to optimize the response parameters of EDM to obtain maximum Material Removal Rate (MRR) and minimum Tool Wear Rate (TWR) and Surface Roughness (SR). Analysis of variance (ANOVA) is carried out based on F-test at a confidence interval of 95% to confirm the significant influence of individual parameters. From the above two optimization techniques, the obtained optimal values are current 15 A, gap voltage 55 V, pulse on time 30 μs and an error of less than 5% is observed from the confirmation experiments. Scanning Electron Microscope (SEM) images revealed that there is no formation of cracks but micro pits and holes are observed.

8

Experimental investigation of influence electrical discharge energy on the surface layer properties after EDM

Świercz Rafał, Holubek Radovan

Welding Technology Review

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2020

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R. 92, nr 5

7--13

EN

The modern industry looks for new technologies that lead to improving the durability of parts from difficult-to-cut materials. One of the main fields of study on manufacturing difficult-to-cut materials is using electrical discharge machining (EDM). In this work, the experimental investigation of the influence of discharge current and pulse time, which defines the discharge energy, on surface roughness and average white layer thickness, was carried out. The surface layers properties after machining have a key role in the durability of manufacturing parts. Conducted research indicates that an increase in current and pulse time leads to growing the diameter and power of the discharge channel. It's causing the generation of the roughness of greater height and distance between the individual vertices. The plasma stream generated as a result of electric discharges causes the melting and evaporation of the material locally, while micro streams of liquid metal "thrown" to the gap from craters re-solidify on the surface of the material. Experimental studies and their analysis indicate that the main factors influencing the surface topography and average thickness of the white layer after EDM is the discharge energy.

PL

Współczesny przemysł poszukuje nowych technologii, które prowadzą do zwiększenia trwałości części z trudnych do cięcia materiałów. Jednym z głównych kierunków studiów nad wytwarzaniem materiałów trudno skrawalnych jest obróbka elektroerozyjna (EDM). W pracy przeprowadzono eksperymentalne badanie wpływu prądu wyładowania oraz czasu impulsu określającego energię wyładowania na chropowatość powierzchni i średnią grubość białej warstwy. Właściwości warstw powierzchniowych po obróbce skrawaniem mają kluczową rolę w trwałości części produkcyjnych. Z przeprowadzonych badań wynika, że wzrost natężenia prądu i czasu impulsu prowadzi do zwiększenia średnicy i mocy kanału wyładowczego. Powoduje to generowanie nierówności o większej wysokości i odległości między poszczególnymi wierzchołkami. Strumień plazmy powstający w wyniku wyładowań elektrycznych powoduje miejscowe topienie i parowanie materiału, podczas gdy mikrostrumienie ciekłego metalu "wyrzucane" do szczeliny z kraterów ponownie krzepną na powierzchni materiału. Badania eksperymentalne i ich analiza wskazują, że głównymi czynnikami wpływającymi na topografię powierzchni i średnią grubość białej warstwy po EDM jest energia wyładowania.

9

Investigations of Electro-Discharge Mechanical Machining of Manganese Cast Steels

Młynarczyk P. S., Spadło S.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 2

95--100

EN

This paper presents a study of the hybrid electro-discharge mechanical machining BEDMM (Brush Electro-Discharge Mechanical Machining) with the application of a rotary disk brush as a working electrode. The discussed method enables not only an effective machining with a material removal rate of up to 300 mm3/min but also finishing (with the obtained roughness of Ra < 0.5 μm) of the surfaces of complex-shaped alloys with poor machinability. The analysis of the factors involved in the machining process indicates that its efficiency is determined by electrodischarge. The use of flexible working electrodes makes it possible to apply simple technological instrumentation and results in the simplicity of the process automation. The aim of the study was to obtain quantitative relationships between the parameters of brush electro discharge mechanical machining (BEDMM) and its effects. The presented experimental research results define the effect of the process input parameters on the performance and roughness of machined surfaces obtained for manganese cast steel.

10

The analysis of EDM electrodes wear in corners and edges

Mouralova K., Bednar J., Benes L., Hrabec P., Kalivoda M., Fries J.

Archives of Civil and Mechanical Engineering

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2020

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Vol. 20, no. 4

484--497

EN

Die-sinking electrical discharge machining is an unconventional technology that allows to machine all at least minimally electrically conductive materials regardless of their physical and mechanical properties. Despite the fact that it is not a conventional technology, the tool gets also worn out, which is a tool electrode. The wear of the electrode does not only mean its loss but also the degradation of the shapes that are transferred to the resulting workpiece. For this reason, a design of experiments was conducted with 6 input factors, 2 were categorical: the electrode material (copper, graphite) and workpiece material (steel 1.2363 and steel 1.2343ESR) and 4 were numerical: Open-voltage, Pulse current, Pulse on-time, and Pulse off-time. In the framework of this design of experiments, the wear of the used graphite and copper electrodes at their corners and edges was evaluated, which was made possible by the use of electron microscopy and the use of approximation circles. Furthermore, the eroding speed, the topography of the machined samples, and the morphology of the surfaces of the used electrodes were investigated. It has been recognized that the use of a graphite electrode will allow for more accurate workpiece shapes and less wear.

11

Badania wstępne obróbki elektroerozyjnej w gazie z zastosowaniem dodatkowego chłodzenia przedmiotu obrabianego

Żyra Agnieszka, Skoczypiec Sebastian

Zarządzanie Przedsiębiorstwem

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2019

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Vol. 22, nr 1

25--32

EN

Electrodischarge machining (EDM) in the gas can be an alternative to traditional electrodischarge machining in dielectric liquids. Dry EDM has many advantages comparing with traditional EDM, what is more with optimal machining parameters it is possible to gain very good accuracy and quality of machined surface. Moreover, EDM in the gas is environmental friendly, even that it is still not used in industry because of the problems with proper heat dissipation from the machining gap which results in problems with achieving satisfying repetitiveness. In the paper the results of austenitic steel X5CrNi 1810 electrodischarge drilling in the air and in the air in deionised water environment were presented. The aim of the research was to determinate the influence of current intensity, current voltage, pulse on time, pulse off time and a type of electrodes’ polarization on the material removal rate, working electrode wear and the machined material surface structure.

12

Influence of Recast Layer on the Fatigue Life of Ti6Al4V Processed by Electric Discharge Machining

Eakambaram A., Xavior M. A.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 4

1541--1548

EN

In this research work, Ti6Al4V alloy material was subjected to electric discharge machining (EDM) and its fatigue life was investigated at low cycle fatigue mode. In order to evaluate the influence of recast layer generated during the machining process on the fatigue life, samples prepared using end milling process were also subjected to similar tests and a comparative analysisis presented. Data were observed in the fully reversed fatigue mode at room temperature using samples fabricated as per ASTM standard E606. The specimen were machined on a spark electric discharge die sink machine which were subjected to fatigue, and the recorded fatigue lives were compared with the fatigue life of end milled specimen. The machined surfaces were examined through optical and scanning electron microscopes, and the roughness was measured with a standard profilometer. It was observed that when the discharge current is augmented, the recast layer formed was in the range of 20 to 70 μm thick. From the results, it is being concluded that fatigue life of the samples fabricated by EDM is less for various load conditions when compared with that of the end milled sample. The milled sample at 160 MPa load exhibited 2.71×105 cycles, which is 64% more when compared to EDM sample.

13

An influence of Titanium Alloy Ti10V2Fe3Al Microstructure on the Electrodischarge Process Efficiency

Żyra A., Bogucki R., Skoczypiec S.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 3

1005--1010

EN

In the work results of research on electrodischarge machining (EDM) of titanium alloy Ti10V2Fe3Al with (α + β) structure were presented. Preliminary heat treatment of samples allows to obtain different morphology and volume fraction of the α phase. The main goal of research was to assessment of the material microstructure impact on EDM technological factors (ie. material removal rate, tool wear) and morphology of technological surface layer. Electrodischarge machining is alternative and increasingly used method of titanium alloys machining. Research allowed to indicate the possibilities and limitations of use EDM in this area. It is especially important in the aspect of parts produced for aircraft industry and related requirements for the technological surface layer quality.

14

Experimental research on electrodischarge drilling of high aspect ratio holes in Ti-6Al-4V alloy

Lipiec P., Machno M., Skoczypiec S.

Technical Transactions

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2018

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Vol. 115, iss. 10

171--180

EN

The drilling of small cylindrical (D < 1 mm) holes with a high ratio of length to diameter (L/D > 10) in difficult-to-cut materials is significantly beyond mechanical drilling capabilities. Electrodischarge machining (EDM) is a good and cost effective alternative in such situations. The machinability of electrodischarge machined material is determined by its thermal and electrical properties; therefore, the high electrical resistivity, the relatively high melting point and low thermal conductivity of Ti-6Al-4V alloy cause problems during the machining of parts made of this material. In this article, the results of experimental research on electrodischarge microdrilling in Grade 5 Ti-6Al-4V alloy are presented. The influence of various machining parameters (pulse time, discharge voltage, current amplitude, dielectric pressure, electrode-tool rotation speed) on key technological factors such as hole depth, side gap, linear tool wear, mean drilling speed and hole taper angle was analysed.

PL

Drążenie cylindrycznych otworów o małych średnicach (D < 1 mm) charakteryzujących się dużą smukłością (L/D > 10) w trudnoskrawalnych materiałach wykracza poza możliwości konwencjonalnych metod wiercenia. Obróbka elektroerozyjna jest dobrą i efektywną alternatywą dla tego typu zastosowań. Obrabialność w EDM jest zdeterminowana przez właściwości związane z przewodnością cieplną i elektryczną obrabianego materiału oraz dielektryka. Wysoki opór elektryczny i relatywnie wysoka temperatura topnienia, przy niskiej przewodności cieplnej stopu tytanu Ti-6Al-4V, powodują pewne problemy podczas jego obróbki, co stwarza konieczność poszukiwania jej optymalnych parametrów. W artykule przedstawiono wyniki badań doświadczalnych procesu mikrodrążenia elektroerozyjnego stopu tytanu Ti-6Al-4V. Badano wpływ parametrów obróbki takich jak: czas impulsu, wartość napięcia pracy i amplitudy prądu, ciśnienia dielektryka, prędkości obrotowej elektrody roboczej na podstawowe wskaźniki technologiczne oraz dokładności wymiarowe i kształtowe.

15

Wybrane zagadnienia obróbki elektroerozyjnej stopów tytanu

Żyra A., Skoczypiec S.

Stal, Metale & Nowe Technologie

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2018

|

nr 3-4

81--84

PL

Tytan i jego stopy dzięki doskonałym właściwościom wytrzymałościowym i zmęczeniowym, odporności na działanie wysokiej temperatury oraz odporności na oddziaływanie środowisk korozyjnych i agresywnych (w tym również materiałów biologicznych) znajdują obecnie szerokie zastosowanie w wielu zaawansowanych gałęziach przemysłu (tj.: lotniczego, kosmicznego czy medycznego). Z drugiej jednak strony wskazane – korzystne ze względu na eksploatację – właściwości stopów tytanu są źródłem znacznych problemów przy ich obróbce metodami konwencjonalnymi. Dlatego też w dążeniu do optymalizacji kosztów wytwarzania oraz osiągania pożądanej dokładności wymiarowo-kształtowej elementów ze stopów tytanu do ich obróbki wykorzystuje się metody niekonwencjonalne. Jedną z powszechniej stosowanych jest obróbka elektroerozyjna (EDM).

EN

Titanium and its alloys are widely used in the advanced branches of industry (aeronautical, space and medical industry) due to their very good mechanical properties, wear resistance, high temperature resistance, resistance to corrosion and biologically active environments. On the other hand, the above mentioned properties of titanium alloys, advantageous in the aspect of exploitation capabilities, cause significant problems during conventional machining. Hence, in the striving to the optimization of the production costs as well as proper shape and dimensional accuracy of the machined elements made of titanium alloys, non-conventional machining techniques are used. One of the commonly used method is electrical discharge machining (EDM).

16

Topografia powierzchni a walory użytkowe elementów po obróbce elektroerozyjnej i powierzchniowej zgniotem

Podolak-Lejtas A.

Przegląd Spawalnictwa

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2018

|

R. 90, nr 3

26--30

PL

Celem badań była ocena skutków modyfikacji topografii powierzchni kształtowanej obróbką elektroerozyjną a następie poddanej nagniataniu dynamicznemu odśrodkowemu przez zastosowanie głowicy do mikromłoteczkowania. Głowica ta jest alternatywnym sposobem obróbki sekwencyjnej po EDM, do wykorzystywanej we wcześniejszych badaniach głowicy do roto pennu. Badania te stanowią kontynuację pracy nad modyfikacją warstwy wierzchniej zgniotem powierzchniowym elementów obrobionych elektroerozyjnie.

EN

The aim of the reseach was the assesment of the surface topography modifications effects shaped by electrodischarge machining and then subjected to dynamic centrifugal burnishing by applying the microhammering head. This head is an alternative method of sequential treatment after EDM, to the roto penn head used in the earlier studies. These studies are a continuation of work on the modification of the surface layer by surface cold work treatment of electrodischarge machined components.

17

Optimization of machining variables in Electric Discharge Machining using stainless steel 317 in full factorial method

Nandhakumar S., Sathish Kumar S., Sakthivelu K.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 1

105--117

EN

Electric Discharge Machining (EDM) is a non-conventional machining process and has a larger extent of application in manufacturing industry due to its accuracy. EDM simply uses electrical spark between the tool and workpiece in presence of dielectric medium to erode the workpiece in controlled manner. Improving the material removal rate and decreasing the tool wear rate (TWR), achieving higher surface finish, reducing machining time and enhancing dimensional accuracy are the major areas of focus in electrical discharge machining (EDM) process of SS 317 grade steel. In this research work effort to reduce the tool wear rate is concentrated by comparing the machining performance of two distinct electrodes namely copper and brass. Each electrode has their unique machining capabilities and the experimental results were compared in-terms of tool wear rate (TWR), Metal Removal Rate (MRR) and Machining Time (TM). Input variables were optimized based on the experimental output responses to achieve optimal level of input variables.

18

Common Data Environment (CDE) – poszukiwanie środowiska współpracy dla BIM

Boruc J.

Materiały Budowlane

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2018

|

nr 7

68--70

19

Electrical discharge machining of difficult to cut materials

Świercz R., Oniszczuk-Świercz D., Dąbrowski L.

Archive of Mechanical Engineering

|

2018

|

Vol. LXV, nr 4

461--476

EN

The development of industry is determined by the use of modern materials in the production of parts and equipment. In recent years, there has been a significant increase in the use of nickel-based superalloys in the aerospace, energy and space industries. Due to their properties, these alloys belong to the group of materials hard-to-machine with conventional methods. One of the non-conventional manufacturing technologies that allow the machining of geometrically complex parts from nickel-based superalloys is electrical discharge machining. The article presents the results of experimental investigations of the impact of EDM parameters on the surfaces roughness and the material removal rate. Based on the results of empirical research, mathematical models of the EDM process were developed, which allow for the selection of the most favourable processing parameters for the expected values of the surface roughness Sa and the material removal rate.

20

Opomiarowany refuler

Skibowski M.

Surowce i Maszyny Budowlane

|

2017

|

nr 4

26--29

PL

Jak zoptymalizować proces pozyskiwania kruszyw lub pogłębiania z użyciem pogłebiarki? Rozwiązaniem jest system do pomiaru parametrów jakościowych urobku wydobywanego przez pogłębiarkę.