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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effect of silicon content on machinability of AL-SI alloys
    Autorzy:
    Akyüz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/102852.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    machining
    cutting force
    mechanical properties
    Al-Si alloys
    Opis:
    In this study the effect of the change in the amount of Silicon (Si) occuring in Al-Si alloys on mechanical and machinability properties of the alloy was investigated. The change in mechanical properties and microstructure, which depends on the increase in Si percentage, and the effects of this change on Flank Build-up (FBU), wear on the cutting edge, surface roughness, and machinability were also studied. Alloys in different ratios of Si (i.e. 2 to 12 wt %), were employed in the study. The specimens for tests were obtained by casting into metal moulds. The results obtained from experimental studies indicate improved mechanical properties and machinability, depending on the rise in Si percentage in Al-Si alloys. It is also observed that the increase in Si percentage enhanced surface quality.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 31; 51-57
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extending stability limits by designed-in damping
    Autorzy:
    Daghini, L.
    Archenti, A.
    Osterlind, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/99943.pdf
    Data publikacji:
    2013
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    high damping interface
    cutting stability
    operational dynamic properties
    machine tool design
    Opis:
    With advances in material technology come challenges to productivity. New materials are, in fact, more difficult to machine with regards to tool wear and especially machine tool stability. This paper proposes to extend the stability limits of the machining system by enhancing the structures damping capability. The aim of the research work presented here is to introduce a unified concept based on the distribution of damping within the machining system components exploiting the dynamic properties of the existing joints. To maintain a high level of static stiffness, it was chosen to adapt hydrostatic clamping systems to the tools. Damping is designed in the structure via high damping interfaces (HDI), intentionally introduced interfaces where the damping ratio is enhanced by introduction of viscoelastic polymer metal composites between the two metallic surfaces composing the interface. In this paper HDI are introduced at two joints, between tool and turret and between turret and lathe. The tests show that the designed-in damping is effective and allows extending the stability limits of the machining system. The implementation of designed-in damping allows the end user to select the most suitable parameters in terms of productivity avoiding the hassle of tuning the devices, having to acquire a deep knowledge in structural dynamics or having to use additional control systems. In addition to this, the enhanced machine tool system becomes less sensitive to stability issues provoked by difficult-to-machine materials or even fluctuations of the work material properties that might occur in everyday production processes.
    Źródło:
    Journal of Machine Engineering; 2013, 13, 1; 37-48
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thinning effects on stand formation and modifications of a young pine/birch forest: a boreal zone case study
    Autorzy:
    Nakvasina, Elena Nikolaevna
    Voevodkina, Alexandra Viktorovna
    Volkov, Alexey Gennadievich
    Zakharov, Andrey Yurievich
    Koptev, Sergey Viktorovich
    Minin, Nicolai Stepanovich
    Powiązania:
    https://bibliotekanauki.pl/articles/2042461.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    strip cutting method
    boreal forest
    ecological interactions
    forest understory vegetation
    soil properties
    Opis:
    Thinning of young forests attracts the attention of scientists despite the long-term commercial effect. However, these researches are scarce. Therefore, it is important to study experiments with a long history. The aim of our study is to investigate the impact of thinning carried out in young pine/birch boreal forests on stand formation, natural regeneration, ground cover and properties of the soil layers in stands. We investigated three types of thinning in young pine/birch forests. In one plot of the initial stand, thinning was performed in two stages with a time interval of 27 years; in the first stage, thinning intensity was 75% of stems, while in the second stage, thinning intensity was 30%. In two other plots, thinning was performed in one stage at a stand age of 13 years, with thinning intensities of 76 and 84%. At the stand age of 72 years (2017), integrated studies of the silvicultural and ecological states were carried out. All thinned plots had developed into pure pine stands with 28–53% thicker stems, 12–18% higher trees and a growing stock 55–92% higher compared to the un-thinned reference stand. The most pronounced differences were observed for Option 1. With thinning, forest type changed to red whortleberry type, while the un-thinned reference site developed into a blueberry type forest. Thinning in young pine/birch stands results in the formation of pure pine stands. The associated modification of environmental properties changed the composition and density of the ground cover and some properties of the upper soil layers. Two-stage thinning had the least impacts; this approach can be used to produce stands with high commercial value. It is especially recommended for young pine/birch forests in the northern taiga.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2019, 61, 3; 197-210
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecological cutting fluids
    Ekologiczne ciecze obróbkowe
    Autorzy:
    Sułek, M. W.
    Seweryn, A.
    Bąk-Sowińska, A.
    Bujak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258402.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    cutting fluids
    aqueous solutions
    surfactants
    tribological properties
    operational properties
    ciecz obróbkowa
    roztwór wodny
    surfaktanty
    właściwości tribologiczne
    właściwości eksploatacyjne
    Opis:
    Industrial cutting fluids are used in the form of emulsions and microemulsions of the o/w type. They pose a hazard for the natural environment and the personnel working with them. This paper presents a new type of safe cutting fluids: aqueous solutions of surfactants. Physicochemical, tribological and operational tests were carried out in order to optimize the compositions of the cutting fluids. Physicochemical and operational properties of the optimized cutting fluid are comparable to those of the best equivalents available on the market.
    Stosowane w praktyce przemysłowej ciecze obróbkowe występują w formie emulsji i mikroemulsji typu o/w. Stanowią one zagrożenie dla środowiska naturalnego oraz ludzi na stanowiskach pracy. W przedstawionym artykule zaprezentowano nowy rodzaj bezpiecznych w stosowaniu cieczy chłodząco-smarujących. Są nimi wodne roztwory aktywne powierzchniowo. Dla zoptymalizowanych składów cieczy obróbkowych przeprowadzono badania fizykochemiczne, tribologiczne oraz eksploatacyjne. Ciecz obróbkowa o zoptymalizowanym składzie ma porównywalne a nawet korzystniejsze właściwości fizykochemiczne i użytkowe w porównaniu z ich najlepszymi odpowiednikami rynkowymi.
    Źródło:
    Problemy Eksploatacji; 2016, 4; 107-118
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Adding Iron Powder From Plasma Cutting on the Microstructure, Mechanical Properties of the Composite Based on Aluminum Powder Matrix Made Using Powder Metallurgy
    Autorzy:
    Wędrychowicz, M.
    Bydałek, A. W.
    Migas, P.
    Skrzekut, T.
    Noga, P.
    Madej, P.
    Kałasznikow, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049543.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Fe composite
    iron powder
    plasma cutting
    aluminum matrix composites
    powder metallurgy
    mechanical properties
    Opis:
    The paper presents the results of research on the effect of added iron powder from plasma cutting on the mechanical properties and structure of a composite rod based on aluminum powder. The iron powder came from plasma cutting of steel elements and was handed over by the enterprise “AK Anatol” from Żary. One of the ways to dispose of it is to use it as a filler in aluminum composite rods. Research shows that Fe can be distributed in aluminum evenly, and increase in mechanical properties is achieved at the expense of only a slight increase in density. The proposed system does not reduce the amount of waste produced by plasma cutting but finds a use for some of it. The sintering point of the powder required a strongly reducing atmosphere (Po2 < 10-50 atm) which seems virtually unachievable under laboratory conditions. The reinforcing mechanism is related to the fragmentation of the matrix aggregate particles and the uniform distribution of Fe particles in the aluminum matrix.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 273-279
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the OCHN3MFA steel in terms of cutting forces and cutting material flank wear mechanisms in hard turning processes
    Autorzy:
    Majerík, Jozef
    Barényi, Igor
    Pokorný, Zdenek
    Sedlák, Josef
    Neumann, Vlastimil
    David, Dobrocký
    Jaroš, Aleš
    Krbata, Michal
    Jambor, Jaroslav
    Kusenda, Roman
    Sagan, Miroslav
    Procházka, Jiri
    Powiązania:
    https://bibliotekanauki.pl/articles/2086873.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical properties
    microstructural analysis
    cutting forces
    flank wear
    crater wear
    właściwości mechaniczne
    analiza mikrostrukturalna
    siły tnące
    Opis:
    This article deals with the effect of selected machining parameter values in hard turning of tested OCHN3MFA steel in terms of SEM microstructural analysis of workpiece material, cutting forces, long-term tests, and SEM observations of flank wear VB and crater wear KT of used changeable coated cemented carbide cutting inserts in the processes of performed experiments. OCHN3MFA steel was selected as an experimental (workpiece) material. The selected experimental steel was analyzed prior to hard turning tests to check the initial microstructure of bulk material and subsurface microstructure after hard turning and chemical composition. Study of workpiece material’s microstructure and worn cemented carbide cutting inserts was performed with Tescan Vega TS 5135 scanning electron microscope (SEM) with the X-Ray microanalyzer Noran Six/300. The chemical composition of workpiece material was analyzed with Tasman Q4 surface analyzer. All hard turning experiments of the used specimens were performed under the selected machining parameters in the SU 50A machine tool with the 8th selected individual geometry of coated cementite carbide cutting inserts clamped in the appropriate DCLNR 2525M12-M type of cutting tool holder. During the hard turning technological process of the individual tested samples made of OCHN3MFA steel, cutting forces were measured with a Kistler 9257B piezoelectric dynamometer, with their subsequent evaluation using Dynoware software. After the long-term testing, other experiments and results were also realized, evaluating the influence of selected machining parameters with different cutting insert geometry on the achieved surface quality.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139203, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vegetable oils derivatives as the modifiers of the lubricating properties of water
    Autorzy:
    Sułek, M.W.
    Sas, W.
    Przondo, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/778150.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ekologiczne ciecze obróbkowe
    ciecz obróbkowa
    opór ruchu
    zużycie
    właściwości przeciwzatarciowe
    ecological cutting fluids
    motion resistance
    wear
    antiseizure properties
    Opis:
    Water has been used as a lubricating medium in a number of applications in tribology. Its insufficient lubricating properties are modified by appropriate additives. The aim of the tribological studies presented in this paper is an application of a mixture containing triglyceride ethoxylates and partial glycerides as well as esters and a block copolymer as additives. All the components are commercially available and relatively cheap. In order to examine the aqueous solutions, two kinds of tests were carried out on a four-ball apparatus: at the fixed load - measurements of the friction coefficient and wear as a function of time and seizure tests which made it possible to determine the scuffing load (Pt), the seizure load (Poz) and the limiting pressure of seizure (p(oz)). Changes in the quantities measured were analyzed as a function of concentrations ranging from 0.001% to 100%. In the fixed load tests the coefficient of friction decreased almost eight-fold, reaching the lowest value of 0.06 at above 0.1% concentration of the additive. Wear decreased over 3.5-fold. In the seizure tests a relatively high efficiency of the additive package was observed at the concentration of the order of the thousandth part of one percent. The compositions reached the maximum anti-seizure capacity at the concentrations of 4 and 10%. It is particularly interesting to note that the stability of the lubricating film being formed was characterized by the scuffing load. The maximum value of Pt was about 4kN high. Summing up, on the basis of the results obtained it may be concluded that the choice of package additives was correct and it effectively modified the lubricating properties of water.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 3; 147-150
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Heat Treatment on Machining Properties of the AlSi9Cu3(Fe) Alloy
    Autorzy:
    Wieroński, W.
    Pezda, J.
    Ponikwia, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/379474.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silumin
    heat treatment
    machinability
    refining
    mechanical properties
    cutting power
    aluminum alloys
    obróbka cieplna
    obróbka mechaniczna
    rafinacja
    właściwości mechaniczne
    cięcie
    stopy aluminium
    Opis:
    Automation of machining operations, being result of mass volume production of components, imposes more restrictive requirements concerning mechanical properties of starting materials, inclusive of machinability mainly. In stage of preparation of material, the machinability is influenced by such factors as chemical composition, structure, mechanical properties, plastic working and heat treatment, as well as a factors present during machining operations, as machining type, cutting parameters, material and geometry of cutting tools, stiffness of the system: workpiece – machine tool – fixture and cutting tool. In the paper are presented investigations concerning machinability of the EN AC-AlSi9Cu3(Fe) silumin put to refining, modification and heat treatment. As the parameter to describe starting condition of the alloy was used its tensile strength Rm. Measurement of the machining properties of the investigated alloy was performed using a reboring method with measurement of cutting force, cutting torque and cutting power. It has been determined an effect of the starting condition of the alloy on its machining properties in terms of the cutting power, being indication of machinability of the investigated alloy. The best machining properties (minimal cutting power - Pc=48,3W) were obtained for the refined alloy, without heat treatment, for which the tensile strength Rm=250 MPa. The worst machinability (maximal cutting power Pc=89,0W) was obtained for the alloy after refining, solutioning at temperature 510 oC for 1,5 hour and aged for 5 hours at temperature 175 oC. A further investigations should be connected with selection of optimal parameters of solutioning and ageing treatments, and with their effect on the starting condition of the alloy in terms of improvement of both mechanical properties of the alloy and its machining properties, taking into consideration obtained surface roughness.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 137-140
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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