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    Wyświetlanie 1-6 z 6
    Tytuł:
    Application of response surface methodology and fuzzy logic based system for determining metal cutting temperature
    Autorzy:
    Tanikić, D.
    Marinković, V.
    Manić, M.
    Devedžić, G.
    Ranđelović, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/199818.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    machining
    cutting temperature
    infrared thermography
    response surface methodology
    fuzzy logic
    obróbka
    temperatura cięcia
    termografia w podczerwieni
    metodologia odpowiedzi powierzchni
    logika rozmyta
    Opis:
    The heat produced in metal cutting process has negative influence on the cutting tool and the machined part in many aspects. This paper deals with measurement of cutting temperature during single-point dry machining of the AISI 4140 steel, using an infrared camera. Various combinations of cutting parameters, i.e. cutting speed, feed rate and depth of cut lead to different values of the measured cutting temperature. Analysis of the measured data should explain the trends in temperature changes depending on changes in the cutting regimes. Furthermore, the temperature data is modelled using response surface methodology and fuzzy logic. The models obtained should determine the influence of cutting regimes on cutting temperature. The main objective is the reduction of cutting temperature, i.e. enabling metal cutting process in optimum conditions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 435-445
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction modelling in metal cutting with integrated tool wear effects
    Modelowanie tarcia w skrawaniu metali ze zintegrowanym wpływem zużycia narzędzia
    Autorzy:
    Grzesik, W.
    Żak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/176037.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction
    tool wear
    metal cutting
    silicon ceramic tool
    spheroidal cast iron
    tarcie
    zużycie ostrza
    skrawanie metali
    narzędzia z ceramiki azotkowej
    żeliwo sferoidalne
    Opis:
    In this paper, friction in longitudinal turning operations when using chamfered uncoated ceramic tools is investigated. Both tool-chip and workpiece - tool interactions are integrated in the friction model. The values of three force components were consequently measured during tool wear tests at different cutting speeds they were used as input data for computing the friction and normal forces acting on the rake and flank faces and, as a result, for determining the relevant friction coefficients. It was observed that both friction coefficients are sensitive to tool wear progression depending on the cutting speed used. For comparison the values of friction coefficient were determined for orthogonal (2D) friction model. The 3D friction model was tested for the machining of spheroidal cast iron (SCI) using uncoated nitride ceramic inserts.
    Prowadzono analizę tarcia w operacjach toczenia wzdłużnego z użyciem narzędzi z niepowlekanej ceramiki azotowej. W przyjętym modelu tarcia uwzględniono synergię oddziaływania na styku ostrze - wiór i przedmiot - ostrze. Wykonano pomiary wartości trzech sił składowych w czasie próby zużycia ostrza dla różnych wartości prędkości skrawania. Określane wartości użyto jako dane wejściowe do wyznaczenia wartości siły tarcia i siły normalnej, i w kolejności do wyznaczenia wartości określonego współczynnika tarcia. Stwierdzono, że współczynnik tarcia jest wrażliwy na przyrost zużycia narzędzia, zależnie od prędkości skrawania. W celu porównania wyznaczono wartości współczynnika tarcia dla ortogonalnego (2D) modelu tarcia. Weryfikację modelu 3D tarcia prowadzono dla skrawania żeliwa sferoidalnego z zastosowaniem niepowlekanych płytek ostrzowych z ceramiki azotowej.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 3; 5-19
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plastic Deformation Zone in Electromagnetic Cutting
    Autorzy:
    Zimniak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/351240.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal forming
    electromagnetic sheet metal cutting
    aluminium
    copper
    Opis:
    This paper presents the application of the electromagnetic field as a tool for metal sheet cutting. The experiments showed that one can easily adapt the conventional cutting equipment to the electromagnetic cutting technology and thereby eliminate the mechanical work of the punch and the press. Two methods exploiting the electromagnetic field as the tool for cutting sheet metal were used. In one of the methods the cutting element was a die while in the other method a punch was used for cutting. Owing to the high quality surface of the cut obtained by each of the methods the cutting process does not entail additional costs for removing burrs. The shape of the surface of the cut is different than the one obtained by traditional blanking – no zones characteristic of the latter are present here. In the case of both materials, the rollover of the sheet surface is much larger and longer than in the conventional method. In comparison with the conventional method, the electromagnetic machining technology ensures high quality of the surface of the cut and can be successfully used in the industry.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2303-2308
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Cutting of MMC Castings – Preliminary Selection of Process Parameters
    Autorzy:
    Nagolska, D.
    Krajcarz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380575.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    composite casting
    laser cutting
    kompozyt metalowy
    odlew kompozytowy
    cięcie laserowe
    Opis:
    Composite materials gain more and more applications thanks to their specific properties and possibilities of shaping of products made out of them. One of the product forming technologies is cutting. Although most metal matrix composites are ready for use after volume shaping e.g. by casting, it is worth to define also possibilities of processing these materials also by this technology. This paper presents possibilities of cutting metal matrix composites and compares existing methods and their application range. The laser cutting of metal matrix composites reinforced with hard ceramic fiber was of particular interest in this work. Preliminary process parameters were determined and quality of obtained cut edges was compared with basic material of the aluminum matrix. This comparison proved that presence of reinforcement negatively affects the quality of the cut surface. However, the laser cutting process is efficient and it allows elastic shaping of metal matrix composites reinforced with hard ceramics.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 125-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Machinability Studies on the Turning of Magnesium Metal Matrix Composites
    Autorzy:
    Gobivel, K.
    Vijay Sekar, K.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2125540.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg-SiCp composite
    cutting forces
    surface quality
    chip microstructure
    tool morphology
    Opis:
    Magnesium-based MMCs are widely used in structural-based applications due to their lightweight, high hardness, corrosion and wear resistance. Also, machining is an important manufacturing process that is necessary to ensure dimensional accuracy and produce intricate shapes. In this context, the machining of Magnesium based metal matrix composites is undertaken to study the impact of the cutting parameters on the machinability behaviour. In this work, turning of pure Mg/SiCp on a Lathe is done and an in-depth assessment on the machining forces, machined surface quality, chip microstructure, and tool morphology has been carried out using TiAlN coated tooling insert. The analysis revealed that the thrust force decreased due to the thermal softening of the matrix meanwhile the feed force also followed the similar trend at higher cutting speeds because of the minimized built-up edge and cutting depth whereas principal cutting force was inconsistent at higher cutting speeds. The surface finish was better at high cutting speed - low feed combination. The chip microstructure revealed that gross fracture propagation at the free surface and variations in the shear bands have occurred at different cutting speeds. Tool studies using SEM analysis revealed wear modes like chipping and built-up edge at low cutting speeds, but with a reduced impact at intermediate cutting conditions, whereas abrasion wear was observed predominantly in the tool nose at higher cutting speeds.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 939--948
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis Of Drilling Of A Metal Plate With Pilot Hole
    Analiza wiercenia metalowej płyty z otworem pilotującym
    Autorzy:
    Kim, K. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/354541.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    finite element method
    drilling
    pilot hole
    cutting force
    plastic strain
    metoda elementów skończonych
    wiercenie
    otwór pilotujący
    siła cięcia
    odkształcenie plastyczne
    Opis:
    This paper performed a numerical analysis study of the cutting characteristics when drilling a taper hole whose upper and lower diameters are different, that is, a pilot hole. 3-dimensional drilling analysis was performed using a commercial code, and these results were used to determine analytically and compare the cutting temperature, the phenomenon of cutting chip formation, deformation and pressure, etc., for the tools, chips, and specimens during cutting. Also, cutting force and the required energy were calculated and compared. To verify the results of analysis, a cutting dynamometer was used to analyze 3-axis cutting force. Results of analysis showed that the specimen maintained a temperature of approximately 650°, with rapid cooling after chips were formed from the specimen. The tool reached a maximum of 700°, similarly to the chips. It is expected that these results will be utilized to optimize cutting processes and work conditions when drilling holes.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1307-1310
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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