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    Wyświetlanie 1-7 z 7
    Tytuł:
    Testing of Air-Cooling Efficiency of the Underside of a Turning Tool Carbide Insert in EN-GJL 250 Cast Iron Turning Operations
    Autorzy:
    Bartoszuk, Marian
    Prażmowski, Mariusz
    Hurey, Igor
    Powiązania:
    https://bibliotekanauki.pl/articles/2201829.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    cast-iron machining
    air cooling systems
    cutting temperature
    surface roughness
    tool wear
    Opis:
    This article shows the results of research on the effectiveness of operation of an original tool air cooling system in cutting. A case of turning EN-GJL 250 cast iron with TH10 tungsten carbide cutting inserts without protective coatings was selected for testing. The paper gives constructional details of the tested tool cooling system and discusses the principle of its operation. The research carried out has shown that this way of cooling the cutting insert causes a significant decrease in temperature in all sub-areas of the cutting zone. In addition, air cooling has been proven to significantly reduce cutting tool wear and slightly improve the roughness of the machined surface. The results obtained showed that the proposed method of cooling can be successfully used in the treatment of grey cast iron. In the future, it may serve as a basis for the construction of a professional cooling system for industrial applications.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 4; 1--9
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing Body Machining Including Variable Casting Allowances
    Autorzy:
    Gessner, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1841423.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron geometry assessment
    machining allowance
    machining cost minimization
    Opis:
    The work contains the results of research conducted to optimize the machining of milling table castings. The possibility of reducing the total volume of machining allowances, reducing the wear of cutting tools, shortening machining time and eliminating idle machining passes was considered. The tests were carried out on two batches of castings supplied by two independent foundries. Casting geometry measurements were made using a structured light scanner. The analysis included machining with cemented carbide tools and tool ceramics at two machining centers: DMC200U and DMC270U. It has been shown that as a result of eliminating idle machining passes, it is possible to reduce machining time by 12% for the first and by 44% for the second casting supplier. The estimated annual savings for the production volume of 500 pcs of these castings can range from € 7388 to even € 23 346. The actual cost of cheaper casts was also calculated, taking into account the difference in machining cost resulting from larger machining allowances.
    Źródło:
    Management and Production Engineering Review; 2021, 12, 2; 65-74
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wybrane aspekty obróbki wiórowej i nagniataniem wyrobów z żeliw
    Some aspects of machining and burnishing of cast irons products
    Autorzy:
    Czechowski, K.
    Wronska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/404366.pdf
    Data publikacji:
    2015
    Wydawca:
    Wydawnictwo AWART
    Tematy:
    żeliwo
    parametry toczenia i frezowania
    parametry nagniatania
    cast iron
    cutting tools
    machining
    burnishing
    Opis:
    Przedstawiono rodzaje żeliw. Omówiono zagadnienia obróbki wiórowej i nagniataniem wyrobów z żeliw. Przedstawiono przykładowe parametry toczenia, frezowania i nagniatania żeliw.
    Kinds of cast irons are presented. Machining and burnishing of products from cast irons is considered. Examples of parameters for turning and milling and burnishing of cast irons are given.
    Źródło:
    Obróbka Metalu; 2015, 1; 24-34
    2081-7002
    Pojawia się w:
    Obróbka Metalu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Key determinants for high-alloyed cast irons for mechanical engineering
    Autorzy:
    Pacha-Gołębiowska, H.
    Piekarska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174169.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    chropowatość
    żeliwo stopowe
    powłoka
    wear
    alloyed cast iron
    machining conditions
    alloying additives
    coatings
    roughness
    Opis:
    This work presents the factors determining cast iron, and particularly austenitic high-alloy cast iron as a construction material, which is ranked among the leading casting alloys of iron with carbon, mainly due to its very good service properties, which makes it dedicated as a material for automotive castings, pipe and fitting castings and components resistant to elevated temperatures, corrosion and abrasive wear. Construction materials currently used in industry have increasingly better properties and their potential is depleting quickly. This forces the manufacturers to adjust the requirements and production capabilities of cast iron using the most modern technologies that give the expected beneficial economic and operating effects. The paper quotes the results of research in the field of the offered technologies that give special surface features to machine parts made of cast iron by modernising the parameters of the technological process of obtaining high-alloy austenitic cast iron, i.e., by applying coatings, as well as by appropriate surface treatment, the aim of which is and reinforce the material surface with those properties which are important in a given application.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 146--167
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości tribologiczne warstwy wierzchniej elementów z żeliwa EN-GJS2131 po obróbce wykończeniowej toczeniem
    Tribological properties of surface layers of GJS2131 cast iron parts after finish turning
    Autorzy:
    Feldshtein, E.
    Pacha-Gołębiowska, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/188800.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    żeliwo stopowe
    tarcie
    zużycie
    temperatura
    warunki obróbki
    cast iron alloyed
    friction
    wear
    temperature
    machining conditions
    Opis:
    W pracy przedstawiono wyniki badań właściwości tribologicznych powierzchni elementów wykonanych z żeliwa GJS2131 po obróbce wykończeniowej toczeniem z zastosowaniem różnych materiałów narzędziowych i w zróżnicowanych warunkach obróbki. Wykonane badania wykazały mniejszą wartość współczynnika tarcia w przypadku użycia materiału supertwardego CBN7050 oraz wolniejszy wzrost temperatury w strefie tarcia dla tego materiału narzędziowego o blisko 20% w stosunku do płytek z węglika spiekanego K10. Właściwy dobór warunków toczenia i materiałów narzędziowych w znaczący sposób wpływa na intensywność zużywania WW elementów trących. Najniższą wartość intensywności zużycia objętościowego dla żeliwa GJS2131 uzyskano przy zastosowaniu materiału CBN7050 w warunkach toczeniu z dużymi prędkościami i niewielkimi posuwami.
    In this paper, the results of studies on the surface tribological properties of parts made of spheroidal graphite cast iron GJS2131 with a ferrite-pearlite structure after finish turning with different tool materials and machining conditions are presented. Investigations revealed minimum values of the friction coefficient and the slower, 20%, increase of temperature in the case of inserts made of “superhard” material CBN7050 compared to the hard alloy K10. The correct choice of turning conditions and tool material significantly affects the intensity of the wear of the rubbing surfaces. The lowest values of the volumetric wear rate intensity are registered in the case of CBN7050 tool material when turning at high speeds and low feed rates and in the case of K10 material when turning at low speeds and high feed rates. When using the investigated tool materials, very significant correlation between the state of the surface layer and its tribological characteristics has been set. In particular, the material CBN7050 has high coefficients of correlation between the intensity of wear Iv and the degree of distances distortion ∆d/d between the planes of the crystal net, macrostresses (σ1 + σ2), microhardness HV0.05, and the friction coefficient, as well as between the values of (σ1 + σ2) and the friction coefficient or between the dislocation density, microhardness and the friction coefficient. The coefficients of correlation between the friction coefficient and wear rate are less significant. This is evidence of a moderate influence of the friction coefficient on the wear rate of turned surfaces.
    Źródło:
    Tribologia; 2013, 2; 57-67
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sclero-topometry metrology in valorisation of waste oil for micro-machining of ductile cast iron
    Autorzy:
    Eymard, S.
    Ignaszak, Z.
    Mathia, T. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/947506.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sclero topometry
    waste oil
    scratch test
    ductile cast iron
    oil revalorizationin machining
    olej odpadowy
    próba zarysowania
    żeliwo sferoidalne
    Opis:
    During the time, the specific characteristics and the efficient life time of oil progressively decrease, due to complex pollution, ultimately making the oil unsuitable for the initial applications. The strategy to regenerate and to valorise waste oils is investigated using improved combinations of sclerometric and topometric tests on ductile nodular cast iron. Tribo-abrasive tests are performed in critical conditions, with base oil, waste oil and regenerated oil, of similar viscosities in order to discriminate their interfacial performances. The forms of the scratch traces indicate wear resistance and tendency to elasto-plastic deformation. The mechanisms of deformation and frictional behaviours were evaluated using optical and Scanning Electron Microscopy and measured for various tribological conditions with tactile and optical profilometry. The Energy Dispersive X ray Spectroscopy completes the chemical superficial distribution of pertinent elements. The surface topography metrology is used to characterize the scratch profiles and to determine the volume of the displaced and removed material, as well as maximum pit height. The originality of this paper is that it is a unique approach specifically devoted to transformer oil concerning tribological conditions.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 4; 29-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear analysis of cemented carbide during turning of cast iron considering economical machining speed
    Autorzy:
    Znojkiewicz, N.
    Korzeniewski, D.
    Wiciak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/94192.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    economical machining speed
    turning
    tool wear
    cast iron
    cemented carbide
    prędkość obrotowa
    toczenie
    zużycie narzędzi
    żeliwo
    węglik spiekany
    Opis:
    The purpose of this paper is to find economical machining speed during turning of grooves for piston rings with various feeds. In the first part of the paper, literature analysis concerning durability of cutting tools is presented. Next, the wear of cemented carbide cutting tools during turning of cast iron is researched. The research has been done for seven cutting tools. During conducted turning trials, angular speed has been altered from n=530rev/min to n=710rev/min and feeds from f=0.007mm/rev to f=0.105mm/rev. On the basis of Taylor’s equation, which relates cutting speed to tool life, the economical cutting speed is established with the application of two various methods.
    Źródło:
    Archives of Mechanical Technology and Materials; 2017, 37; 27-34
    2450-9469
    Pojawia się w:
    Archives of Mechanical Technology and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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