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Wyświetlanie 1-10 z 19
Tytuł:
An innovative method for forming balls from scrap rail heads
Autorzy:
Pater, Z.
Tomczak, J.
Bulzak, T.
Powiązania:
https://bibliotekanauki.pl/articles/102162.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
die forging
balls
FEM
Opis:
The paper describes a new method for forming grinding media balls from scrap rail heads. This forming method involves the following operations: cutting the rail head to the desired length combined with lateral pressing of the produced workpiece; flashless die forging and sizing of balls in a helical impression. The proposed method was verified by numerical simulation which involved the modeling of a forming process for producing 80 mm diameter balls. As a result of the modeling, it was possible to examine the changes in the workpiece shape during each forming operation, the variations in loads and torques, as well as the distribution of temperatures enabling performing another forming operation, i.e. quenching. The results confirm that the designed method can be used to produce balls.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 31; 151-157
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of helical rolling process of balls formed from a head of a scrapped rail
Autorzy:
Pater, Z.
Powiązania:
https://bibliotekanauki.pl/articles/103019.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
helical rolling
balls
FEM
Opis:
This paper presents an innovative helical rolling process of balls destined for mills manufac¬tured from a scrapped rail head. In this process, helical rolls are applied, whose construction allows obtaining a cylindrical bar, and later balls are formed from this bar in the further stage of the process. It is advised to precede the rolling process by side pressing leading to increase of billet material shape compactness. Verification of the assumed solution correctness was made using numerical sim¬ulation, with the application of Simufact.Forming software.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 30; 110-114
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of a Rolling Process for Producing Steel Balls Using Helical Rolls
Autorzy:
Chyła, P.
Pater, Z.
Tomczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/353136.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
helical rolling
FEM analysis
balls
effective strain
Opis:
This paper presents the research results of the balls rolling process according to the conventional and modified methods of rolling. Theoretical analysis was carried out by using numerical methods based on the Finite Element Method. The Simufact package version 10.0 were used for calculation. Simulations of balls rolling were carried out under conditions of 3D state of strain, taking into account the effect of thermal conditions occurring during forming. The study of the achieved results showed that the best rolling process parameters were obtained for the modified method, in which the feed material is heated up to 1150 °C. In this case, the rolling parameters such as: rolling force and torque as well as tool wear reached the smallest values.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 485-492
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern grinding balls sorting machines
Autorzy:
Piekaj, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2064389.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
grinding media
grinding balls
sorting machine
sorting TAB
balls sorter
mielniki
kule mielące
maszyna sortująca
sortowanie TAB
sortownik kulowy
Opis:
Raw materials produced in large quantities are ground in ball, vibratory and stirred ball mills. In mills, the working parts are grinding balls. During grinding, grinding balls wear, change their diameter and lose their shape. The effect of this is the unfavourable change in the grinding balls parameters, which results in deterioration of the technological conditions of the milling process. Relevant parameters of the grinding balls set are restored during maintenance shutdowns. Grinding balls are sorted into appropriate size classes; grinding balls that are not suitable for further use are rejected, and then a set of grinding balls with appropriate parameters is used again. The time needed to prepare the required set depends mainly on the sorting time. To reduce this time, appropriate grinding balls sorting machines are used. The paper presents major problems associated with the grinding balls sorting process, a comparison of modern types of grinding balls sorting machines, a description of their construction and technological parameters.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 86--95
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Flat Wedge Rolling Mill for Forming Balls from Heads of Scrap Railway Rails
Autorzy:
Tomczak, J.
Pater, Z.
Bulzak, T.
Powiązania:
https://bibliotekanauki.pl/articles/356705.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
forgings of balls
rolling
cross-wedge rolling mill
Opis:
The paper describes the design of a flat-wedge reversing mill used for forming balls directly from heads of scrap railway rails. At the beginning an innovative rolling method for producing balls is presented. This two-stage method consists in forming balls from heads of scrap railway rails using plate-shaped flat tools. The first stage involves preparation of a workpiece by changing the irregular shape of the rail head into a round bar. Next, the workpiece is automatically moved to the working space of the other tool set, where forgings of balls are formed on return motion of the slide. To enable the production of balls under industrial conditions in accordance with the above concept, a flat-wedge rolling mill was designed and constructed. The results demonstrate that the machine can be used to produce balls from heads of scrap railway rails.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 5-12
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acute naphthalene toxicity following ingestion of mothballs and ethyl alcohol: a case report
Autorzy:
Roshan, Nikesh Kumar
Vishwas, Kirti
Kumar, Neeraj
Powiązania:
https://bibliotekanauki.pl/articles/29432052.pdf
Data publikacji:
2023
Wydawca:
Towarzystwo Pomocy Doraźnej
Tematy:
Naphthalene balls
mothballs
ethyl alcohol
toxicity
intensive care unit
Opis:
Naphthalene poisoning is an uncommon poisoning due to its pungent smell, taste, insolubility in water, and poor absorption from the gut following exposure to naphthalene-containing compounds such as mothballs. Paradichlorobenzene has been reported to dissolve more quickly in alcohol. Within a period of 48-96 hours following naphthalene mothball exposure patient presents with acute onset of non-bloody bilious vomiting, dark brown urine and watery diarrhoea. We present a diagnostic and therapeutic challenge while treating a 27 years old male admitted to the intensive care unit with features of acute naphthalene-toxicity, methemoglobinemia and acute kidney injury following accidental ingestion of mothballs and ethyl alcohol. His vital signs at the time of intensive care unit admission included fever, tachycardia, and hypotension, and his laboratory workup demonstrates hyperbilirubinemia with indirect predominance, hemolytic anaemia, methemoglobinemia, and renal dysfunction. Treatment options include supportive care, red cell transfusion, ascorbic acid, methylene blue, and N-acetylcysteine. The importance of obtaining a careful history and clinical findings is of paramount importance, especially in making the right diagnosis and a successful outcome largely depends on it.
Źródło:
Critical Care Innovations; 2023, 6, 1; 29-35
2545-2533
Pojawia się w:
Critical Care Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the process of rolling steel balls in skew rolling mill - metallographic analysis
Autorzy:
Chyła, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2069745.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
skew rolling of balls
microstructure
100Cr6
rail steel
Opis:
This paper presents the results of metallographic research studies carried out for stock materials as well as the samples collected from the balls formed in the rolling process in a skew rolling mill. The stock material was bearing steel 100Cr6 and the steel from rail scrap. The rolling process was carried out in parallel for the two assumptions: the conventional method (hereinafter referred to as conventional rolling) and the modified method (hereinafter referred to as modified rolling). After the rolling process, three cooling media were used: air, water and oil. The pictures below, which depict microstructures, were taken using the bright-field and the dark-field microscopy technique, the samples were etched with a 4% solution of picral.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2021, 24(1); 171--182
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of processing parameters on properties of polyamide filled with glass balls
Autorzy:
Gnatowski, A.
Chyra, M.
Powiązania:
https://bibliotekanauki.pl/articles/105952.pdf
Data publikacji:
2016
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
polyamide
composites
glass balls
thermomechanical properties
poliamid
kompozyty
kulki szklane
właściwości termomechaniczne
Opis:
Comparative analysis of thermomechanical properties of polyamide and polyamide composites with addition of 30% of glass balls was performed. The specimens were obtained using the injection moulding technology by means of KraussMaffei KM65-160C1 injection moulding machine. The non-filled polyamide and part of components were injected using the parameters recommended by the manufacturer. A reduced value of mould cooling temperature was used for the other non-filled specimens. The differential scanning calorimetry (DSC), hardness testing, impact strength testing, bending resistance and dynamic mechanical thermal analysis (DMTA) were also performed.
Źródło:
Acta Innovations; 2016, 20; 5-12
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wystąpienia kul lodowych na Mierzei Helskiej
Analysis of occurence of ice balls on the Hel Spit
Autorzy:
Dyrcz, C.
Powiązania:
https://bibliotekanauki.pl/articles/223132.pdf
Data publikacji:
2014
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
zjawiska lodowe
kule lodowe
otoczaki lodowe
ice phenomena
ice balls
ice boulders
Opis:
W artykule przedstawiono analizę wystąpienia rzadkiego zjawiska lodowego, którym było powstanie kul lodowych na Mierzei Helskiej (Półwyspie Helskim) w pobliżu portu Jastarnia od strony Zatoki Puckiej w warunkach wody morskiej o słabym zasoleniu. Na akwenie Morza Bałtyckiego jest to zjawisko unikalne.
This paper presents a rare oceanographic phenomenon which is the formation of ice balls. The uniqueness of this phenomenon is the fact that the ice balls on the Hel Spit (Hel Peninsula) are formed in conditions of salt water. So far formations of ice balls most often observed and described have occurred in fresh water regions.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2014, R. 55 nr 1 (196), 1 (196); 17-29
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Edubal” jako nowa metoda w pedagogii gier i zabaw z piłką – przegląd badań
Edubal as a new teaching method with the use of ball-centered fun activities – research review
Autorzy:
Rokita, Andrzej
Cichy, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/464912.pdf
Data publikacji:
2014
Wydawca:
Akademia Wychowania Fizycznego we Wrocławiu
Tematy:
edukacja wczesnoszkolna
zajęcia ruchowe
piłki edukacyjne „edubal”
early school education
exercise
‘edubal’ educational balls
Opis:
The aim of this study was to sum up the experiences gained during twelve-year research on effects of using educational balls called ‘edubal’ in PE classes in grades 1 to 3 of the primary school (i.e. children aged 7 to 10). The research was carried out in Poland an in Germany. The authors focused their attention on objectives and tasks of contemporary education of children aged 7 to 10 – first of all supporting and stimulating comprehensive development of children, especially with regard to improving coordinative motor abilities which determine, inter alia, reading and writing skills. Employment of ‘edubal’ education balls in early school education (grades 1 to 3 of the primary school) activates cognitive, emotional and physical spheres of a child and hence contributes to the integration of the subject content. The children while participating in PE classes with the use of education balls learn about letters, spelling rules, colours, mathematical signs and punctuation marks as well as numerous rules which are useful in linguistic and mathematical education and they shape their coordination abilities and improve physical skills. Moreover, they also develop their coordination abilities. ‘Edubal’ education balls have a much wider scope of application than it was the case twelve years ago. They are also used in occupational therapy of disabled persons and in work with dyslectic children who attend therapeutic schools.
Źródło:
Rozprawy Naukowe Akademii Wychowania Fizycznego we Wrocławiu; 2014, 45; 70-78
0239-4375
Pojawia się w:
Rozprawy Naukowe Akademii Wychowania Fizycznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 19

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