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Wyświetlanie 1-15 z 114
Tytuł:
Elasticity of cores manufactured in cold box technology
Autorzy:
Dobosz, S. M.
Grabarczyk, A.
Major-Gabryś, K.
Bolibruchova, D.
Powiązania:
https://bibliotekanauki.pl/articles/355352.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
moulding sands
cold-box technology
elasticity of moulding sands
Opis:
In the foundry industry, as in many other fields we seek to achieve the best quality with the least losses and the lowest cost. To meet these demands numerous plants increased automatization of their manufacturing processes. However, with changes in the production process it is necessary to change also the materials used. Not only casting alloys that are used in production, but also applied moulding and core sands are important. Proper selection and evaluation of the properties of used moulding mixtures is crucial in order to achieve a highly efficient production. In this article a new issue concerning the use of flexibility in foundry molding and core was mentioned. It explains the principles of measurement and interpretation of the obtained results for the cold-box moulding sands.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 351-354
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości piasków hydrofobizowanych emulsjami alkoksysilanowymi ustalone w badaniach wstępnych
The properties of hydrofobized sand established in the preliminary studies
Autorzy:
Baryła, P.
Wojciechowski, M.
Lefik, M.
Powiązania:
https://bibliotekanauki.pl/articles/403097.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
piaski hydrofobizowane
hydrofobizacja
właściwości piasków
sands hydrophobised
hydrophobising
sands properties
Opis:
Celem badań jest wstępne ustalenie parametrów wodoprzepuszczalności oraz wytrzymałościowch nowego materiału budowlanego, jakim jest grunt hydrofobizowany. Badania przeprowadzono dla dwóch naturalnych piasków średnich oraz dla czterech mieszanin grunt-emulsja hydrofobizująca. Stałą filtracji k wyznaczono z użyciem aparatu ZWK2 dla próbek przed dodaniem emulsji hydrofobizującej oraz w aparacie trójosiowym dla gruntów po hydrofobizacji. Kąt tarcia wewnętrznego [fi]s oznaczono w aparacie bezpośredniego ścinania. Gęstość właściwą [ρ]s wyznaczono z użyciem kolby Le Chateliera, a maksymalną gęstość objętościową [ρd] max – w cylindrze normowym. Badania wykazały, że dodatek środka hydrofobizującego obniżył współczynnik filtracji, przy jednoczesnym utrzymaniu parametrów wytrzymałościowych na poziomie parametrów piasków przed hydrofobizacją.
The aim of the research is to determine the permeability and strength properties for the innovative building material – hydrofobized soil. Tests were performed for two sands with different particle size distribution (MSa1, MSa2), mixed with several types of hydrophobizing emulsions (E1-E4). Basic properties of these mixtures, their maximum dry density, strength properties, capillary rise and filtration properties were examined and, afterwards, compared with analogous results obtained for the sands before hydrophobization. Strength and filtration properties for hydrophobized sands were examined in triaxial compression apparatus. The angle of internal friction for natural sands was tested in direct shearing test apparatus and their filtration properties – in "ZWK2" apparatus. All tested samples showed lower permeability after hydrophobization. Strength properties remain almost the same after hydrophobization process.
Źródło:
Budownictwo i Inżynieria Środowiska; 2013, 4, 2; 91-97
2081-3279
Pojawia się w:
Budownictwo i Inżynieria Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilation and Modelling of Sands in the Light of Experimental Data
Autorzy:
Sawicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/241366.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
sands
dilation
constitutive equations
Opis:
The problem of dilation is discussed in the context of classical Cam-Clay model, which was developed on the basis of a specific assumption regarding the plastic work. This assumption leads to a special form of the dilation function, from which a shape of yield function is derived. The above mentioned assumption is compared with the results of the triaxial tests, performed on the model “Skarpa” sand. It is shown that the Cam-Clay approach is not realistic, as it is based on the assumption which is not consistent with experimental data. Some general considerations and discussion of this problem are also presented.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2014, 61, 1-2; 3-15
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Złoża piasków kwarcowych w niecce tomaszowskiej, stan i problemy ich dokumentowania
Quartz (glass) sands deposits in Tomaszów syncline and their resources reporting problems
Autorzy:
Poręba, E.
Nieć, M.
Dróżdż, S.
Powiązania:
https://bibliotekanauki.pl/articles/169821.pdf
Data publikacji:
2018
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
piaski kwarcowe
piaski szklarskie
dokumentowanie złóż
niecka tomaszowska
Polska
quartz sands
industrial sands
glass sands
resources reporting
Tomaszów syncline
Polska
Opis:
W niecce tomaszowskiej występują dolnokredowe piaski i piaskowce kwarcowe. Wyróżniane są jako formacja z Białej Góry, która obejmuje kilka ogniw o zróżnicowanych parametrach jakości kopaliny. Systematyczne prace rozpoznawcze realizowane od połowy XX w. pozwoliły na udokumentowanie wielu złóż w skrzydłach niecki, o łącznych zasobach około 600 mln ton. W złożach zagospodarowanych znajduje się około 27% całości udokumentowanych zasobów. Piaski i piaskowce kwalifikujące się jako szklarskie występują w dwóch ogniwach. Przedzielone są piaskami gorszej jakości. Piaski szklarskie ogniw złożowych, charakteryzują się w przeważającej masie zawartością krzemionki ponad 98%, zawartością Fe2O3 poniżej 0.08% i TiO2 poniżej 0.10%. Piaski, które nie spełnią wymagań stawianych piaskom szklarskim, wykorzystywane są jako formierskie i wysokiej jakości piaski budowlane. Składnikiem podstawowym frakcji ilastych jest kaolinit, uzyskiwany w wyniku płukania piasku. Złoża są udokumentowane na podstawie kryteriów bilansowości niedostosowanych do współczesnych możliwości ich wykorzystania i znaczna część zasobów jest eliminowana jako niekwalifikujące się do zagospodarowania. Złoża powinny być dokumentowane według kryteriów, definiujących warunki brzeżne dla piasków kwarcowych o wielokierunkowym zastosowaniu.
The peculiar feature of Tomaszów Syncline is the occurrence of Lower Cretaceous quartz sand and sandstone. They form Biała Góra composed of five members of sandy deposits of varied industrial utility defined by their chemical parameters. The systematic exploration realized since the mid of XX-th century allow to demonstrate about 600 mln ton of sand resources suitable for mining, located in several areas in the both syncline wings. 27% of them recently occurs in active opencast mines. Quartz sand and sandstones qualified for glass production form two members separated by sand deposits of lower quality deposits. Glass sands are characterized by silica content over 98%, Fe2O3 below 0.08% and TiO2 below 0.10%. Sands of lower quality are utilized as foundry or to production of high quality building materials. In the mud-clay fraction kaolinite occurs, recovered due to the sand washing and utilized as ceramic raw material. The criteria defining boundaries of deposits resources, actually used are incompatible with the recent sand utilization, and considerable quantity of sand is excluded from resources reporting. The new resources criteria should be formulated conformable with multipurpose quartz sand utilization possibilities.
Źródło:
Górnictwo Odkrywkowe; 2018, 59, 3; 84-99
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size Effect in Centrifuge Cone Penetration Tests
Autorzy:
Bałachowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/241236.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
centrifuge
CPT
quartz sands
grain size
Opis:
In-flight penetration tests with 12 mm mini-cone, were performed in the centrifuge of L.C.P.C. in Nantes, in two uniform quartz sands of different grain size. Stress level effect and particle size effect on the cone resistance were analyzed. Geometry and particle size effects were found for cone penetration in coarse sand especially at a penetration less than the critical depth. The irregularities on the profile of mini-cone penetration in coarse sand can be attributed to particle size effect. The evidence of geometry size effect was not very marked for the relatively narrow range of acceleration applied.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 3; 161-181
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of the Influence of the Number and Distribution of Vents on the Production Process of Cores by the Blowing Method
Autorzy:
Dańko, R.
Powiązania:
https://bibliotekanauki.pl/articles/352765.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
core shooter
core sands
blowing method
Opis:
The results of studies of the cores production by blowing methods with utilising the modified experimental shooting machine SR-3D, are provided in the hereby paper. The core sands from the Cordis technology were applied in the presented investigations. The influence of the number and distribution of vents on the shaped core box filling, filmed by a digital camera, was determined. Investigations were performed for the shooting pressures of 0.4, 0.5 and 0.6 MPa and for three surfaces of the shooting hole, at various numbers and distribution ways of vents in the experimental core box. The selected results of the model investigations were compared with the results of simulations performed previously in the PROCAST programme. The intensity of the core sand outflow from the shooting chamber into the core box of the experimental shooting machine was measured. Technological effects were assessed on the basis of the core sand apparent density in individual parts of the core, in dependence on the character of the pressure increase in the shooting chamber and the pressure value obtained in the core box.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 105-111
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The vegetation of sands in the Chernihiv city (Ukraine)
Autorzy:
Lukash, Oleksandr
Danko, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/2024717.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vegetation
sands
Chernihiv city
anthropogenic influence
Opis:
The vegetation of the Chernihiv city sands (natural and technogenic origin) has rather high syntaxonomic diversity (17 associations and 5 initial communities) and the ruderal phytocoenoses prevail. Natural phytocenoses are represented to a small extent (Cyperetum flavescentis Koch 1926, Dichostylidi–Helochloetum alopecuroidis (Timar 1950) Pietsch 1973, Artemisia scoparia–Dianthus borbasii community, Kochietum arenariae Fijalk 1978). Synanthropic psammophytes species communities that are more resistant to anthropogenic influence, are formed under urban conditions. The ecological range of vegetation of sandy alluvia varies from xerophytic phytocoenoses in mineral-poor sand (Kochietum arenariae) to the communities, which indicate waterlogged areas with increased mineralization of water and saline bottom sediments (Typhetum laxmannii Nedulcu 1968). Itispossibletoobserve the adventization and apophization of sand vegetation, one of the indicators of which is the rupture of coenotic connections between the species of the community. These phenomena indicate that the process of synanthropization of the vegetation cover of the city keeps intensifying, and first of all, occurs in places of newly formed technogenic ecotopes.
Źródło:
Studia Quaternaria; 2020, 37; 31-44
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Litogeneza piaszczystych osadów międzymorenowych w środkowej części Pojezierza Chełmińskiego
Lithogenesis of intertills sand deposits from the central part of the Chełmno Lakeland
Autorzy:
Kenig, K.
Jochemczyk, L.
Trzepla, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074493.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
litologia
stratygrafia
osad międzymorenowy
osad fluwioglacjalny
Pojezierze Chełmińskie
lithology
stratigraphy
interglacial sands
glaciofluvial sands
Chełmno Lakeland
Polska
Opis:
Intertills sand deposits of the Augustovian, Great and Eemian Interglacials were recognized in eight borehole sections of the Chełmno Lakeland. Wartanian glaciofluvial sediments were also studied. All these deposits are well defined in the area by lithological analyses of granulation, mineral composition of light and heavy fractions, roundness of quartz grains and calcium carbonate content. Their Great and Eemian Interglacial age is evidenced by palynological analyses. Among various lithological features distinguishing the interglacial deposits from glaciofluvial ones the most important are mineral characteristics such as contribution of light and heavy fractions. Quantitative lithological features of the interglacial and glaciofluvial sand deposits resulted from many geologic and sedimentologic factors.
Źródło:
Przegląd Geologiczny; 2006, 54, 9; 807-814
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Molding Sand Elasticity
Autorzy:
Major-Gabryś, K.
Grabarczyk, A.
Dobosz, S.M.
Jakubski, J.
Morek, J.
Beňo, J.
Powiązania:
https://bibliotekanauki.pl/articles/106977.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
molding sands
mechanical deformation
elasticity
hot-distortion
Opis:
The progressive mechanization and automation of industrial equipment is the driving force of progress, not only in the field of production but also in the measuring and control equipment. In mold production, the automation of processes such as forming molds and cores along with their assembly has led to increases in serial production, reductions in defects, and the shortening of molding times, among others. Thanks to automation in mold and core departments and the use of all sorts of manipulators, mold production in foundries has gained momentum. Unfortunately, in addition to the mentioned advantages, there are also new challenges as to the quality and properties of the molding and core sands used in highly automated foundries.This article presents recent research on molding sand elasticity. The topic was introduced as an attempt to answer the new needs of highly mechanized foundries. The article discusses a new method of measuring the resistance of molding materials to undergoing mechanical deformation (molding sand elasticity), with an additional analysis of the bending strengths of the tested samples. Precise measurements, test sample preparation, and interpretation of the received results are presented in the article.
Źródło:
Journal of Casting & Materials Engineering; 2018, 2, 2; 38-44
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Wastes Produced by Polish Ferrous Alloys Casting Foundries between the Years 2010–2014
Autorzy:
Skrzyński, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/106995.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
spent foundry sands
casting wastes
environment protection
Opis:
The balance of wastes originating from the foundry processes of ferrous alloys, prepared on the basis of data made available by the Polish Central Statistical Office, is presented in this paper. The kind and amount of individual foundry wastes subjected to management and storage by foundry plants were analysed. The problem of wastes between the years 2010–2016 is discussed on the national scale, as well as in individual regions or voivodeships. Altogether, 27,375.9 tons of waste from the group no. 10, of which non-ferrous metal and ferrous alloy wastes from foundry plants constituted 2%, were produced in Poland in 2010. This situation remained at a similar level over successive years, till 2014. The positive prognosis constitutes the fact that the amount of waste stored on dumping grounds belonging to foundry plants in Poland is gradually decreasing. This may be related to increasing costs of waste storage. During the tested years, the annual amount of gathered waste decreased from 4,796.6 thousand tons (in 2010) to 4,477.6 thousand tons (in 2014).
Źródło:
Journal of Casting & Materials Engineering; 2019, 3, 4; 71-75
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Penetration resistance of Lubiatowo sand in calibration chamber tests
Autorzy:
Bałachowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/241154.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
calibration chamber
CPT
DMT
model piles
sands
Opis:
A series of cone penetration tests with standard cone and mini-cone were performed in the calibration chamber at Gdańsk University of Technology. Medium size, double wall chamber permits full control of stress and strain acting on the soil mass. The calibration chamber houses cylindrical soil sample 53 cm in diameter and 100 cm high. Lateral and vertical stresses, as well as strain conditions can be applied independently. The results of pushed-in model piles of small diameter, dilatometer tests, standard cone and mini CPT probe were analysed to determine size and boundary effects in penetration testing for calibration chamber and model sand. Free field values of cone resistance, independent of size and boundary effects, are proposed for Lubiatowo sand.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 4; 311-329
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Moisture Content in Synthetic Moulding Sand on the Grounds of Relative Permittivity Measurement
Autorzy:
Nowak, D.
Gal, B.
Granat, K.
Jaworski, G.
Więcławek, R.
Powiązania:
https://bibliotekanauki.pl/articles/352740.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
moisture content
moulding sands
relative permittivity
microwaves
Opis:
The presented research was aimed at searching for an exact and effective method of determining moisture content in traditional moulding sands. By measuring resonance frequency and quality factor of a waveguide resonance cavity, relative permittivity was determined for different synthetic moulding sands. Analysis of the presented results confirms a linear relation between relative permittivity values and moisture content values in the selected traditional moulding sands. The obtained linear relationship can be used as a reference characteristic for evaluation of humidity of moulding sand.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2189-2192
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quick sands effect on desert lands – example of filtration stability loss
Autorzy:
Strzelecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/178976.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
piaski pustyni
piaski
utrata stabilności
stabilność filtracji
"szybkie piaski"
obliczenia numeryczne
MES (metoda elementów skończonych)
pustynia
filtracja
filtration
sands
FEM
stability loss
desert sands
“quick sands”
numerical calculation
Opis:
The aim of the study was to analyze the loss of filtration stability of fine desert sands due to the air flow caused by temperature difference. The loss of stability induces the effect of so called “quick sands”. Therefore, the calculations of air filtration through the loose sand medium in dry desert climate are presented. FlexPDE v.6. software was used for numerical calculation based on FEM.
Źródło:
Studia Geotechnica et Mechanica; 2013, 35, 1; 219-218
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Paleogene marginal marine sedimentation in central-western Poland
Autorzy:
Widera, M.
Kita, A.
Powiązania:
https://bibliotekanauki.pl/articles/2059473.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Paleogene
lithostratigraphy
palaeogeography
kaolinite sands
deposit extent
Opis:
The Paleogene deposits of central-western Poland area have been studied in more than 300 bore holes and several out crops with lithological, mineralogical and sedimentological methods. Grain-size analyses, heavy mineral analyses, XRD analyses and pebble analyses were mainly used to characterize these deposits. From the Late Eocene until the Late Oligocene central-western Poland area was a marginal part of the NW European Tertiary Basin. For this time interval five informal lithostratigraphical units have been determined: the Pomorze, Lower Mosina, Czempiń, Upper Mosina and Leszno "formations" and addi tionally the Kaolinite Sand Unit. Their correlation is based on lithological features obtained from archival descriptions of borehole profiles. Deposits from boreholes and newly discovered exposures are mainly marine while only the Czempiń "Formation", with lignite intercalations, represent a non-marine environment. These findings help reconstruct the structural and palaeogeographic evolution of the eastern, marginal fragment of the NW European Tertiary Basin. The succession shows evidence of at least four interregional transgressive-regressive cycles. More over, the pres ent-day extent of the Paleogene deposits has been determined much more precisely. The southern limit of marine sedimentation in Paleogene times should be pushed at least a few tens of kilometres south in the vicinity of Konin and Turek, central-western Poland.
Źródło:
Geological Quarterly; 2007, 51, 1; 79-90
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of overburden rocks geological parameters impact to the excavators cutting bodies abrasion in the Most basin conditions
Autorzy:
Řehoř, Michal
Moni, Vlastimil
Helebrant, František
Blata, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2064871.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
excavator
cutting bodies
geology
hard structures
sands
Opis:
The Brown Coal Research Institute started the solving of the research project based on the optimisation of the shape and material of ground and mining machines in 2018. This research is necessary for increasing of efficiency of mining process in conditions of the Most Basin. The very important part of the research was the geological characteristic of the Most Basin main mining localities. Evaluation of the geological situation of the Bílina, Vršany and Libouš mines (mining of the overburden rocks in the ČSA mine finished) is the first stage of the solving of the project described in this article. The occurrence of sandy strata and the parameters of hard rocks are the most important parameters. The most important used laboratory analyses were the content of crystalline quartz, content of siderite, content of calcite and compressive strength. The location of the overburden cuts with similar mining conditions in different mining localities, very important for need of future research, is described in the end of this article.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 356--366
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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