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Wyszukujesz frazę "milling parameters" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Waviness at dry high-speed face milling of some hard steels
    Autorzy:
    Beşliu-Băncescu, Irina
    Slătineanu, Laurenţiu
    Coteaţă, Margareta
    Powiązania:
    https://bibliotekanauki.pl/articles/2052146.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    waviness
    dry high-speed face milling
    hard steels
    milling parameters
    hardness
    empirical mathematical models
    Opis:
    Waviness is a parameter used to complete information on the machined surface state. There is little scientific and technical information on the influence exerted by the cutting conditions and the workpiece material hardness on the values of some parameters that define the waviness of milled surface. No works have been identified to present such information for dry high-speed face milling applied to hard steel workpieces. A factorial experiment with four independent variables at three variation levels was planned to model the influence of milling speed, feed, cutting depth, and steel hardness on the total heights of the profile and surface waviness for dry high-speed face milling. Mathematical processing of experimental results was used to identify the power type function and empirical mathematical models. These models highlight the direction of variation and the intensity of influence exerted by the considered input factors on the values of two waviness parameters in the case of dry high-speed face milling of samples made of four hard steels. It has been observed that the increase in steel hardness increases the total heights of the profile and surface waviness. In the case of two types of steel, a good correlation was identified between the values of the total profile waviness height and the total surface waviness height, respectively, using the Pearson correlation coefficient.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 735-749
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tool stiffness influence on the chosen physical parameters of the milling process
    Autorzy:
    Zębala, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/201625.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stiffness
    milling
    modelling
    Opis:
    This article presents our own model researches, relating to the down milling process of Aluminium alloy (Al6061) and Titanium alloy (Ti6Al4V), with a tool made of sintered carbides. These investigations pay the special attention to the impact of the tool rigidity on the process of chip formation. The simulation calculations have been carried out for two cases of the cutting process: case 1 - assuming an ideally rigid construction of a milling cutter (length of tool does not impact its deflection under the cutting forces); case 2 - it is possible that the tool can be subjected to deflection under the cutting forces (length of a tool part is counted from the holder end to the contact point of a cutting edge with the machining material).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 597-604
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the breakage rate function for selected process parameters in quartzite milling
    Autorzy:
    Olejnik, T. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185104.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wskaźnik szlifowania
    morfologia ziaren
    punkt kontaktowy
    ball mill
    specific grinding rate
    grain morphology
    contact points
    Opis:
    The paper presents the results of studies on quartzite milling in a ball mill. The milling was conducted in a batch system, for diversified compositions of balls. The milling product was subjected to granulometrical, morphological and strength analyses. On the basis of the developed Reid's theory and using the Austin-Gardner equation, a form of the function circumscribing the specific rate of comminution of selected size fractions was determined. The values of the breakage rate function bi, for the mill's apparatus conditions were determined. The impact was investigated for a variable number of grinding media contact points on the values of specific rate S and the values of the breakage rate function bij. Furthermore, the values of coefficients occurring in the equations circumscribing the specific rate of milling S and breakage parameter bij were determined.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 1; 117-129
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Process Parameters During End Milling and Prediction of Work Piece Temperature Rise
    Autorzy:
    Bhirud, N. L.
    Gawande, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140078.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dry milling
    end milling
    Al 6063
    Taguchi method
    variance analysis ANOVA
    regression analysis
    frezowanie na sucho
    frezowanie wykończeniowe
    metoda Taguchiego
    analiza wariancji (ANOVA)
    analiza regresji
    Opis:
    During the machining processes, heat gets generated as a result of plastic deformation of metal and friction along the tool–chip and tool–work piece interface. In materials having high thermal conductivity, like aluminium alloys, large amount of this heat is absorbed by the work piece. This results in the rise in the temperature of the work piece, which may lead to dimensional inaccuracies, surface damage and deformation. So, it is needed to control rise in the temperature of the work piece. This paper focuses on the measurement, analysis and prediction of work piece temperature rise during the dry end milling operation of Al 6063. The control factors used for experimentation were number of flutes, spindle speed, depth of cut and feed rate. The Taguchi method was employed for the planning of experimentation and L18 orthogonal array was selected. The temperature rise of the work piece was measured with the help of K-type thermocouple embedded in the work piece. Signal to noise (S/N) ratio analysis was carried out using the lower-the-better quality characteristics. Depth of cut was identified as the most significant factor affecting the work piece temperature rise, followed by spindle speed. Analysis of variance (ANOVA) was employed to find out the significant parameters affecting the work piece temperature rise. ANOVA results were found to be in line with the S/N ratio analysis. Regression analysis was used for developing empirical equation of temperature rise. The temperature rise of the work piece was calculated using the regression equation and was found to be in good agreement with the measured values. Finally, confirmation tests were carried out to verify the results obtained. From the confirmation test it was found that the Taguchi method is an effective method to determine optimised parameters for minimization of work piece temperature.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 3; 327-346
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of cutting parameters in pocket milling of tempered and cryogenically treated 5754 aluminum alloy
    Autorzy:
    Samtas, G.
    Korucu, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/200335.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloys
    cryogenic treatment
    surface roughness
    Taguchi technique
    optimization
    Opis:
    Aluminum alloys are widely used today in plastic injection molds in the automotive and aerospace industries due to their high strength and weight ratio, good corrosion and fatigue resistance as well as high feed rates. The 5754 aluminum alloy has high corrosion resistance and a structure suitable for cold forming. In this study, an AA 5754-H111 tempered aluminum alloy with the dimensions of 80£80£30 mm was used, and some of the materials were cryogenically heat treated. For the milling operations, φ12 mm diameter 76 mm height uncoated as well as TiCN and TiAlN coated end mills were used. Different levels of cutting depth (1.25, 2.0, 2.5 mm), cutting speed (50, 80, 100 m/ min), feed rate (265, 425, 530 m/ min) and machining pattern (concentric, back and forth and inward helical) were used. The number of experiments was reduced from 486 to 54 using the Taguchi L54 orthogonal array. The values obtained at the end of the experiments were evaluated using the signal-to-noise ratio, ANOVA, three-dimensional graphs and the regression method. Based on the result of the verification experiments, the processing accuracy for surface roughness was improved from 3.20 μm to 0.90 μm, with performance increase of 71.88%.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 697-707
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Milling Time on Formation of NiTi Alloy Produced by High-Energy Ball Milling
    Autorzy:
    Salwa, P.
    Goryczka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/354533.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NiTi alloys
    high-energy ball milling
    crystallite size
    microstrain
    lattice parameters
    Opis:
    Mixture of nickel and titanium powders were milled in planetary mill under argon atmosphere for 100 hours at room temperature. Every 10 hours the structure, morphology and chemical composition was studied by X-ray diffraction method (XRD), scanning electron microscope (SEM) as well as electron transmission microscope (TEM). Analysis revealed that elongation of milling time caused alloying of the elements. After 100 hours of milling the powders was in nanocrystalline and an amorphous state. Also extending of milling time affected the crystal size and microstrains of the alloying elements as well as the newly formed alloy. Crystallization of amorphous alloys proceeds above 600°C. In consequence, the alloy (at room temperature) consisted of mixture of the B2 parent phase and a small amount of the B19’ martensite. Dependently on the milling time and followed crystallization the NiTi alloy can be received in a form of the powder with average crystallite size from 1,5 up to 4 nm.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1301-1307
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Milling Time on Formation of NiTi Alloy Produced by High-Energy Ball Milling
    Autorzy:
    Salwa, P.
    Goryczka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/352287.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NiTi alloys
    high-energy ball milling
    crystallite size
    microstrain
    lattice parameters
    Opis:
    Mixture of nickel and titanium powders were milled in planetary mill under argon atmosphere for 100 hours at room temperature. Every 10 hours the structure, morphology and chemical composition was studied by X-ray diffraction method (XRD), scanning electron microscope (SEM) as well as electron transmission microscope (TEM). Analysis revealed that elongation of milling time caused alloying of the elements. After 100 hours of milling the powders was in nanocrystalline and an amorphous state. Also extending of milling time affected the crystal size and microstrains of the alloying elements as well as the newly formed alloy. Crystallization of amorphous alloys proceeds above 600°C. In consequence, the alloy (at room temperature) consisted of mixture of the B2 parent phase and a small amount of the B19' martensite. Dependently on the milling time and followed crystallization the NiTi alloy can be received in a form of the powder with average crystallite size from 1,5 up to 4 nm.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 1017-1022
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of technological parameters and geometric features of a cutting edge on cutting forces during AZ91HP alloy milling
    Wpływ parametrów technologicznych i cech geometrycznych krawędzi skrawającej na siły skrawania w procesie frezowania stopu AZ91HP
    Autorzy:
    Gziut, O.
    Kuczmaszewski, J.
    Zagórski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/175632.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-speed dry milling
    magnesium alloys
    machinability
    cutting forces
    frezowanie na sucho
    stopy magnezu
    skrawalność
    siły skrawania
    Opis:
    This article presents the state of knowledge on cutting forces during the milling of light alloys. Research results presented in the paper concern cutting forces and their amplitudes depending on the technological parameters (vc, fz, ap) with the use of two carbide milling cutters having a different cutting edge geometry (γ=5º and γ=30º). Research and analysis of cutting forces appear to be a significant factor determining chip deformation, temperature and cutting area strain, among others. Lower values of cutting force components are observed in the case of γ=30º tool processing. For the purpose of this research casting magnesium alloy AZ91HP was selected.
    W pracy wykonano analizę ogólnego stanu wiedzy dotyczącą sił skrawania podczas frezowania stopów lekkich. Przedstawiono wyniki pomiarów sił skrawania w zależności od zmiany określonych parametrów technologicznych (vc, fz, ap) przy zastosowaniu dwóch frezów węglikowych o zmiennej geometrii ostrza (γ=5º i γ=30º). Ustalono, że wartości sił skrawania są czynnikiem determinującym m.in. odkształcanie się wióra, temperaturę oraz odkształcenia materiału warstwy wierzchniej w strefie skrawania. Mniejsze wartości składowych sił skrawania stwierdzono dla obróbki narzędziem o kącie γ=30º. Proces obróbki prowadzono dla stopu magnezu AZ91HP.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 2; 83-92
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental modeling of the milling process of aluminum alloys used in the aerospace industry
    Autorzy:
    Țîțu, Aurel Mihail
    Pop, Alina Bianca
    Nabiałek, Marcin
    Dragomir, Camelia Cristina
    Sandu, Andrei Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2086888.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mathematical modeling
    experimental research
    process parameters
    machined surface quality
    quality assurance
    modelowanie matematyczne
    badania eksperymentalne
    parametry procesu
    jakość obrabianej powierzchni
    zapewnienie jakości
    Opis:
    This research presents an experimental study carried out for the modeling and optimization of some technological parameters for the machining of metallic materials. Certain controllable factors were analyzed such as cutting speed, depth of cut, and feed per tooth. A dedicated research methodology was used to obtain a model which subsequently led to a process optimization by performing a required number of experiments utilizing the Minitab software application. The methodology was followed, and the optimal value of the surface roughness was obtained by the milling process for an aluminum alloy type 7136-T76511. A SECO cutting tool was used, which is standard in aluminum machining by milling. Experiments led to defining a cutting regime that was optimal and which shows that the cutting speed has a significant influence on the quality of the machined surface and the depth of cut and feed per tooth has a relatively small impact on the chosen ranges of process parameters.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e138565, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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