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    Wyświetlanie 1-10 z 10
    Tytuł:
    Surface texture analysis after ball end milling with various surface inclination of hardened steel
    Autorzy:
    Wojciechowski, S.
    Twardowski, P.
    Wieczorowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221105.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface texture
    ball end milling
    hardened steel
    Opis:
    In this paper, an analysis of various factors affecting machined surface texture is presented. The investigation was focused on ball end mill inclination against the work piece (defined by surface inclination angle α. Surface roughness was investigated in a 3D array, and measurements were conducted parallel to the feed motion direction. The analysis of machined surface irregularities as a function of frequency (wavelength λ), on the basis of the Power Density Spectrum - PDS was also carried out. This kind of analysis is aimed at valuation of primary factors influencing surface roughness generation as well as its randomness. Subsequently, a surface roughness model including cutter displacements was developed. It was found that plain cutting with ball end mill (surface inclination angle α = 0°) is unfavorable from the point of view of surface roughness, because in cutter’s axis the cutting speed νc ≈ 0 m/min. This means that a cutting process does not occur, whereas on the machined surface some characteristics marks can be found. These marks do not appear in case of α ≠ 0°, because the cutting speed νc ≠ 0 on the full length of the active cutting edge and as a result, the machined surface texture is more homogenous. Surface roughness parameters determined on the basis of the model including cutter displacements are closer to experimental data for cases with inclination angles α ≠ 0°, in comparison with those determined for plain cutting (α = 0°). It is probably caused by higher contribution in surface irregularities generation of plastic and elastic deformations cumulated near the cutter’s free end than kinematic and geometric parameters, as well as cutter displacements.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 1; 145-156
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface characterization by accurate measurement and image processing systems on machined surfaces of precision cutting tools
    Autorzy:
    Durakbasa, N. M.
    Bogrekci, I.
    Demircioglu, P.
    Bas, G.
    Gunay, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/385129.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    surface roughness
    end milling
    image processing
    precision machining
    Opis:
    High precise measurement techniques and surface structure analysis are required in advanced fields of interchangeable manufacturing and precision engineering. This study presents the characterization of the surface roughness of the machined milling cutters by experimental precision measurements and the image processing tool. The data obtained are compared to assess the surface characterization parameters and computational data in terms of precision, accuracy, sensitivity, repeatability and resolution. In the experimental measurement phase, the roughness measurements and surface topography characterization were performed in the nanotechnology laboratory using the stylus profilometry and digital microscopy. The computational phase was performed using an image processing toolbox with precise evaluation of the roughness for the machined metal surfaces of the end mill cutting tool. The surface parameter database is established exhibiting an advantage over the traditional method. This study reveals a comparison methodology of the end mill surface parameters using both stylus readings and image processing software for widely used end mill cutting tools that have considerable effect on characterization of sensitive manufacturing surface of millings.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 3; 51-55
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Numerical Investigation of Cutting Forces and Temperatures in Milling of Custom 450 Steel
    Autorzy:
    Gökçe, Harun
    Powiązania:
    https://bibliotekanauki.pl/articles/2125535.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    end milling
    finite element method
    Custom 450
    cutting force
    cutting temperature
    Opis:
    Stainless steels have a wide usage field, their needs as structural parts are increasing day by day due to their resistance to corrosion and providing sufficient mechanical strength in environments that would cause corrosion. In addition to high mechanical properties of the stainless steels, the low heat transmission coefficients bring problems during machining. In this study, the suitable cutting tool and cutting parameters have been evaluated in terms of cutting forces and the tool temperature, the experimental results and finite element analysis have been compared in the milling of Custom 450 stainless steel which offers especially an excellent working opportunity at high temperature and salinity environment. Milling experiments have been carried out using L16 experimental design for Taguchi method. Four simulations have been made using finite element method with corresponding values in L16 orthogonal array for optimum cutting tool and the results were compared in terms of cutting forces and tool temperature changes.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 843--853
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza cech eksploatacyjnych innowacyjnych konstrukcji narzędzi wykorzystywanych w procesach frezowania zgrubnego z wykorzystaniem technologii HSM
    An analysis of the operational characteristics of innovative tool structures used in high speed rough milling processes
    Autorzy:
    Semotiuk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/301473.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    frezowanie wgłębne
    frezowanie walcowo-czołowe
    HSM
    siły skrawania
    eksploatacja narzędzi skrawających
    plunge milling
    end milling
    cutting forces
    maintenance machining tools
    Opis:
    Rozwój systemów narzędziowych determinuje zmiany w doborze strategii obróbkowych wykorzystywanych w procesach obróbki skrawaniem. Jednym z przykładów jest frezowanie czołowe. Pojawienie się frezów do obróbki wgłębnej wymusiło na dystrybutorach oprogramowania typu CAM wprowadzenie do odpowiednich modułów nowej strategii obróbkowej, a co za tym idzie coraz częstszego wykorzystywania frezów czołowych w procesach obróbkowych. Artykuł ma na celu porównanie procesu skrawania z wykorzystaniem frezów jednolitych palcowych walcowo-czołowych i frezów wgłębnych z zastosowaniem technologii HSM oraz ocenę ich właściwości eksploatacyjnych na podstawie sił generowanych w strefie skrawania.
    The development of tooling systems determines changes in the selection of machining strategies used in machining processes. One example is face milling. The appearance on the market of plunge cutters has forced the distributors of CAM-type software to introduce into the appropriate modules a new machining strategy, thus leading to an ever more frequent use of face cutters in machining processes. The aim of this paper is to compare the processes of high speed machining that use integral-tooth end milling cutters to those using plunge milling cutters and to evaluate their operational properties on the basis of the forces generated in the machined zone.
    Źródło:
    Eksploatacja i Niezawodność; 2009, 1; 46-53
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tool path planning for five-axis end milling of cycloidal gears and its full tooth profile accuracy measurement
    Autorzy:
    Wang, Jian
    Liao, Longxing
    Luo, Shanming
    Mo, Jingyu
    Powiązania:
    https://bibliotekanauki.pl/articles/38890069.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    cycloidal gear
    end milling
    five-axis CNC machine tool
    tooth path planning
    full tooth profile accuracy measurement
    Opis:
    This paper proposes a method of end milling of cycloidal gears using a five-axis computer analytical control (CNC) machine tool. Firstly, the basic principle of the five-axis end milling of cycloidal gears is introduced. The cutting characteristics of the ball-end and the flat-end cutters are analyzed. Secondly, the path planning method of the five-axis end milling of cycloidal gears is researched. A curvature matching method is used to check for local over-cut interference and a minimum distance method is used to check for global collision interference. These two interferences are avoided by calculating the feasible range of cutter orientations and adjusting the dips of cutter shafts. Tests of end milling of cycloidal gears are carried out using a ball-end cutter and a flat-end cutter, respectively. Finally, full tooth profile accuracy measurements are undertaken with an image-measuring instrument to assess the quality of cycloidal gears processed in this way. This study provides a theoretical basis for the improvement of the tooth profile accuracy and surface quality of cycloidal gears.
    Źródło:
    Engineering Transactions; 2023, 71, 1; 3-21
    0867-888X
    Pojawia się w:
    Engineering Transactions
    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 machining parameters during end milling of super alloys using grey based taguchi method coupled with entropy measurement technique
    Autorzy:
    Sreenivasulu, Reddy
    Rao, Chalamalasetti Srinivasa
    Powiązania:
    https://bibliotekanauki.pl/articles/95277.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    CNC end milling
    inconel 718 super alloy
    burr height
    surface roughness
    grey based Taguchi method
    entropy measurement
    frezowanie CNC
    superstop Inconel
    chropowatość powierzchni
    metoda Taguchi
    pomiary entropii
    Opis:
    High-quality products include those with better surface quality and texture, close dimensional tolerances and form accuracies at precise level, increase fatigue life and burr-free. Burr formation is one of the most common inevitable facts occurring in all material removal processes, reduces assembly and machined part quality. But, burr formation during milling is a more complex mechanism compare to remaining machining burrs and leads to numerous difficulties during the deburring process. To prevent this, one should optimize the combination of cutting parameters during machining itself. In order to build up a link between quality and productivity and to attain the same in the cost-effective way, the present work concentrate on multi objective optimization of CNC end milling process parameters. Multiple performance characteristics with respect to surface quality and performance index like assembly work have been put up, to assess an equivalent single quality index (called grey relational grade) has been optimized finally by Grey based Taguchi method. After that priority weight of individual quality and performance attributes has been estimated by entropy measurement technique on the basis of relative significance and check the feasibility of the proposed technique has been demonstrated in this context.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2020, 4, 1; 47-56
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring of cutting process in end milling of hard and brittle materials
    Autorzy:
    Shimana, K.
    Kondo, E.
    Yoshidome, A.
    Yamashita, S.
    Kawano, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/99634.pdf
    Data publikacji:
    2014
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    glass milling
    micromachining
    brittle materials
    end mill
    Opis:
    Glass materials have been widely used in optical components in recent years. The purpose of this study was to develop an effective method for real-time detection of the state of cutting tools used in end milling of hard brittle materials. Cutting tests were performed to identify parameters that are useful in monitoring micro tool wear in glass milling. A specific component of the cutting force was found to be related to the progression of tool wear. Furthermore, using fast Fourier transform (FFT) analysis, the peak amplitudes of the cutting forces were found to occur at a specific frequency.
    Źródło:
    Journal of Machine Engineering; 2014, 14, 4; 55-64
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of depth of cut on chip formation in az91hp magnesium alloy milling with tools of varying cutting edge geometry
    Autorzy:
    Gziut, O.
    Kuczmaszewski, J.
    Zagórski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/102170.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    high-speed dry milling
    magnesium alloys
    machinability
    magnesium chips
    end-mill geometry
    Opis:
    Safety of Mg milling processes can be expressed by means of the form and the number of fractions of chips formed during milling. This paper presents the state of the art of magnesium alloys milling technology in the aspect of chip fragmentation. Further-more, the impact of the depth of cut ap and the rake angle γ on the number of chip fractions was analysed in the study. These were conducted on AZ91HP magnesium cast alloy and milling was performed with carbide tools of varying rake angle values (γ = 5º and γ = 30º). It was observed that less intense chip fragmentation occurs with decreasing depth of cut ap. The number of chip fractions was lower at the tool rake angle of γ = 30º. The test results were formulated as technological recommendations according to the number of generated chip fractions.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 26; 49-56
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric model analysis, geometrical characteristics and tool trajectories to surface roughness when machining the cycloid screw by a five-axis milling machine
    Autorzy:
    Pham, Van Bong
    Thien, Nguyen Van
    Nguyen, Van Que
    Duy, Trinh Nguyen
    Nguyen, Duy Khanh
    Tien, Dung Hoang
    Powiązania:
    https://bibliotekanauki.pl/articles/2086278.pdf
    Data publikacji:
    2022
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    cycloid screw surface
    five axis milling machine
    ball nose end mill
    surface roughness
    Opis:
    To improve the screw machining accuracy in modern air compressors. This paper investigates three main issues during the development process for cycloid screw machining methods on five-axis CNC machine tools with high precision and efficiency. First, the theoretical basis of cycloid screw surface shaping and derivative of the final profile equation is established. Then, modeling the center trajectory and feed rate according to the cycloid screw profile is given. Next is the experimental setup and simulation of the cycloid screw machining process and discussions. The obtained surface quality prediction parameters are close to the actual measured value, which can be used as a reference model for five-axis CNC milling technology processes. All experimental results obtained by the proposed mathematical model show that a surface with good surface quality is created, meeting the requirements for surface quality. The main work can be used as references for engineers and technicians in practice.
    Źródło:
    Journal of Machine Engineering; 2022, 22, 2; 108--124
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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