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    Wyświetlanie 1-9 z 9
    Tytuł:
    Measurements of lapping plate temperature
    Autorzy:
    Molenda, J
    Charchalis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/243508.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    flat lapping
    lapping wheel temperature
    material removal rate
    surface roughness
    Opis:
    Lapping process is commonly used for ultra-precision machining of various materials. An essential role during lapping plays flatness of the wheel-working surface because workpiece surface takes mirror image of it. Due to its applications requiring extreme size accuracy, straightness and concentricity, it is very important that working surface remains flat in the course of machining. Getting out of flatness can be caused by uneven wear or heating. To prevent nonuniform wear of lapping plate surface, conditioning rings should be suited appropriate. Lapping machines producers and researchers make recommendations about proper rings position during machining. To provide constant temperature of the wheel, cooling systems are applied in modern machines, but not in all of them. Therefore, wheel temperature problem is significant one, and it should be known. This paper presents results of authors work on choosing proper measurement method of lapping plate temperature. During lapping process wheel is rotating. Maximum velocity value for ABRALAP 380 lapping machine is 65 rev/min. Mainly for this reason, contactless infrared method was selected. Because getting an accurate temperature of an object using this method is difficult, during experiments temperature rise not exact value were analysed. There were also presented results of experiments which goal was to find lap plate emissivity.
    Źródło:
    Journal of KONES; 2014, 21, 3; 245-250
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Steel C45 elements lapping
    Autorzy:
    Molenda, J.
    Charchalis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/241819.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    flat lapping
    steel C45 lapping
    material removal rate
    surface roughness
    Opis:
    Lapping is a process by which material is precisely removed from a workpiece to produce a desired dimension, surface finish or shape. It also removes subsurface damage caused by sawing or grinding. According to the classification surface to be generated, type of surface, kinematics of the cutting process, and tool shape (profile), many process variants can be distinguished. Among them face lapping are the most widespread lapping processes. They are used to produce a smooth, flat, unpolished surface. The process of lapping materials has been applied to a wide range of materials and applications, ranging from metals, glasses, optics, semiconductors and ceramics. Workpiece material properties and structure determine kind of material removal. Material removal by cutting, microfusion processes and material removal by microdeformation or by the induction of microcracks are to be underline. C45 is a medium carbon steel used when greater strength and hardness is desired than in the "rolled" condition, especially in mechanical engineering and automotive components. To minimize wear in high-speed applications requires extreme size accuracy, straightness and concentricity. To meet those high demands turning, grinding, lapping and polishing processes are used. This work presents results of steel C45 elements lapping. The experiments were conducted during flat lapping with use of ABRALAP 380 lapping machine. The lapping machine executory system consists of three conditioning rings. The process results were surface roughness Ra and material removal rate.
    Źródło:
    Journal of KONES; 2014, 21, 1; 169-174
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EDM of aluminum alloy 6061 using graphite electrode using paraffin oil and distilled water as dielectric medium
    Autorzy:
    Imran, M.
    Rahmanshah, S. M.
    Mehmood, S.
    Arshad, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/103373.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    EDM
    white layer
    surface roughness
    material removal rate
    microcracks
    surface integrity
    Opis:
    EDM machining of Al 6061 was performed under varying conditions of pulse current and pulse duration. Graphite was used as an electrode material with distilled water and paraffin oil as two different dielectric mediums. The aim is to characterize the surface integrity produced as a result of EDM machining under both varying electrical and non-electrical parameters as it is important in determining the service life of EDM machined components. The vertical, horizontal and corner surfaces are studied independently for each single set of conditions. The average white layer thickness (AWLT) and surface roughness was found to be dependent on pulse current values and pulse duration. The dielectric medium also has an influence on the thickness and nature of white layer. It was found that the thickness and nature of the white layer formed from distilled water is different from that of paraffin oil. New methods of AWLT and surface roughness measurement through an optical microscope are described. The surface roughness method developed was calibrated against an identical surface roughness tester. Finally, material removal rate, tool wear rate, the presence of micro cracks, voids and globules were compared for different conditions and conclusions were drawn according to the actual physical conditions during machining.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 3; 72-79
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Path Interval and Its Relevance to Cutting Force in Ball and Filleted End Milling
    Autorzy:
    Sekine, Tsutomu
    Powiązania:
    https://bibliotekanauki.pl/articles/2022253.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    path interval
    material removal rate
    cutting force
    ball end mill
    filleted end mill
    Opis:
    Computerized milling process is widely used in product manufacturing. Although manufacturing has gradually become highly-automated, the selection of machining conditions still remains an ever-present challenge in the process. To provide some findings contributable for the process planning, this study focuses on ball and filleted end milling. After brief explanations were given to the path interval determinations in both milling processes, the experiments were conducted to verify and characterize each procedure. The results of computational procedures showed good agreement with the experimental ones. Then, material removal rate and cutting force were analytically proposed for effective selection of machining conditions. The following findings were obtained from the demonstrations with discussion. Ball end milling required relatively large cutting force in the first tool path even though the material removal rate was comparatively small. On the contrary, filleted end mill enabled us to maintain a moderate cutting force in the first tool path even if the material removal rate expanded with increasing tool radius.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 1; 85-94
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing Machinability and Surface Characteristics of a Shape Memory Alloy (SMA) Processed through Wire Electro Spark Erosion Method
    Autorzy:
    Ebenezer, George
    Khan, Adam M.
    Chellaganesh, Duraipandi
    Winowlin Jappes, J. T.
    Haider, Julfikar
    Powiązania:
    https://bibliotekanauki.pl/articles/2125539.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Wire Electro Spark Erosion
    machining
    NiTi alloy
    surface roughness
    material removal rate
    MRR
    Opis:
    In this paper, a study was carried out to investigate the surface roughness and material removal rate of low carbon NiTi shape memory alloy (SMA) machined by Wire Electro Spark Erosion (WESE) technique. Experiments are designed considering three parameters viz, spark ON time (SON), spark OFF time (SOFF), and voltage (V) at three levels each. The surface roughness increased from 2.1686 μm to 2.6869 μm with an increase in both SON time, SOFF time and a decrease in voltage. The material removal rate increased from 1.272 mm3/min to 1.616 mm3/min with an increase in SON time but a varying effect was observed the SOFF time and voltage were varied. The analysis revealed that the intensity and duration of the spark had an unswerving relation with the concentration of the microcracks and micropores. More microcracks and micropores were seen in the combination of SON = 120 μs, voltage = 30 V. The concentration of the microcracks and micropores could be minimised by using an appropriate parameter setting. Therefore, considering the surface analysis and material removal, the low carbon NiTi alloy is recommended to machine with 110 μs - 55 μs - 30 V (SON - SOFF - V respectively), to achieve better surface roughness with minimal surface damage.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 921--930
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Machining of microholes in Ti-6Al-4V by hybrid micro electrical discharge machining to improve process parameters and flushing properties
    Autorzy:
    Mugilan, T.
    Aezhisai Vallavi, M. S.
    Santhosh, S.
    Sugumar, D.
    Christopher Ezhil Singh, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/200937.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid micro electrical discharge machining
    Ti-6Al-4V
    fluid flow simulation
    material removal rate
    diametrical accuracy
    Opis:
    In this research work, the Ti-6Al-4V material was used for the investigation of machining parameters by means of hybrid micro electrical discharge machining to improve the machining process and reduce the negative effects of debris accumulation in the drilled hole. L9 orthogonal array was used in the Taguchi based grey relational analysis to optimize the parameters such as material removal rate and diametrical accuracy of the machining process for Ti-6Al-4V. This work encompasses the design, development, and calibration of the work piece vibration platform and experimental analysis of the process parameters by means of the hybrid micro electrical discharge machining process. The maximum material removal rate and minimum surface roughness was observed at the current value of 2.5 A, pulse on time is 2 μs and pulse off time is 14.5 μs. The maximum material removal rate was observed for the increase in pulse on time with 14.4 μs and 4 A current level. The diametrical accuracy of the microholes was increased while increasing the pulse off time and decreasing the pulse on time. The fluid flow simulation has been conducted to find out the pressure drop and to know the velocity of the flow inside the hole for the effective flushing of the debris during machining.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 565-573
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical discharge machining of difficult to cut materials
    Autorzy:
    Świercz, R.
    Oniszczuk-Świercz, D.
    Dąbrowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/139553.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EDM
    Inconel 718
    surface roughness
    material removal rate
    response surface methodology (RSM)
    chropowatość powierzchni
    szybkość usuwania materiału
    metodologia powierzchni odpowiedzi (RSM)
    Opis:
    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.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 4; 461-476
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the effect of wire electric dischage machining process parameters on the formation of high speed steel form tool
    Autorzy:
    Ishfaq, Kashif
    Mufti, Nadeem Ahmad
    Jawad, Muhammad
    Sajid, Muhammad
    Jahanzaib, Mirza
    Powiązania:
    https://bibliotekanauki.pl/articles/103183.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wire electrical discharge machining (WEDM)
    response surface methodology (RSM)
    ANOVA
    material removal rate (MRR)
    surface roughness (Ra)
    wycinanie elektroerozyjne drutem
    metoda powierzchni odpowiedzi (RSM)
    wskaźnik usuwania materiału (MRR)
    chropowatość powierzchni (Ra)
    Opis:
    The use of form tools is growing in industry, owing to their inherent advantage of improving productivity. However, the accurate formation of form tool profile is a really tedious task. In this research work, wire electric discharge machining (WEDM) process has been used for the generation of a form tool. Pulse on-time, pulse off-time, servo voltage, wire tension, flushing pressure have been considered as input parameters, whereas tool geometry (clearance angle, included angle), surface roughness and material removal rate are the selected responses. Response surface methodology (RSM) (Box Bhenken experimental design) technique has been used for design of experiments. Analysis of Variance (ANOVA) has shown that pulse on-time and pulse off-time are the two influential control factors for material removal rate (MRR), surface roughness (Ra), clearance angle and included angle. Contour plot analysis has been performed to find out the optimal ranges of the most influential control factors for each response characteristics.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 1; 89-98
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrode material on machined surface during spark erosion of Ti-6Al-4V (machined at low range parameters)
    Wpływ obróbki elektroerozyjnej stopu Ti-6Al-4V na zużycie elektrody (w zakresie małych wartości wyładowań elektrycznych)
    Autorzy:
    Thesiya, D.
    Dave, J.
    Rajurkar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/175827.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium Ti-6Al-4V
    Taguchi method
    material removal rate (MRR)
    electrode wear rate (EWR)
    surface roughness (SR)
    ANOVA
    SEM
    stop tytanu Ti-6Al-4V
    metoda Taguchi
    szybkość usuwania materiału
    prędkość zużycia elektrody
    chropowatość powierzchni
    Opis:
    Investigation of the machining performance of the titanium alloy (Ti-6Al-4V) at low range parameters by the electrical discharge machining (EDM) using copper and graphite as electrodes with positive polarity. The objective of this paper is to investigate the peak current (A), servo voltage (V), on time (Ton), off time (Toff) and show the effects on material removal rate (MRR), electrode wear rate (EWR) and surface roughness (SR). Design of experiments (DOE) method by using Taguchi technique (L18) mixed level implemented. The validity test of the fit and adequacy of the proposed model has been carried out through analysis of variance (ANOVA).SR was set the lower the better to attain the optimum dimensional precision. Experimental results indicate that copper as a tool electrode shows a better surface roughness than a graphite electrode.
    W pracy przedstawiono analizę wyników badań obróbki elektroerozyjnej stopu tytanu Ti-6Al-4V w zakresie małej wartości wyładowań elektrycznych z zastosowaniem miedzianej i grafitowej elektrody spolaryzowanej dodatnio. Wyznaczono wpływ parametrów prądowych: natężenia, napięcia, czasu włączenia i wyłączenia na chropowatość powierzchni, prędkość usuwania materiału i zużycie elektrody. W badaniach stosowano zaawansowaną metodę DOE (ang. DOE – Design of Experiments) wyznaczania wpływu zmiennych wejściowych na wynik procesu poddanego analizie. Walidację metody badawczej oraz przyjętego modelu prowadzono z użyciem wariancji ANOVA. Analiza wyników badań potwierdziła, że elektroda miedziana jest lepszym narzędziem do obróbki elektroerozyjnej stopu tytanu.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 4; 39-51
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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