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Wyświetlanie 1-15 z 29
Tytuł:
The Influence of Extrusion Process on the Microstructure and Mechanical Properties of Magnesium Alloys
Autorzy:
Bednarczyk, I.
Kuc, D.
Tomaszewska, A.
Mrugała, A.
Powiązania:
https://bibliotekanauki.pl/articles/958196.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnesium alloys
microstructure
mechanical properties
process of extrusion method KOBO
Opis:
The article presents the results of plastic shaping tests of AZ61 and WE43 alloys. There were both classic extrusion tests as well as extrusion tests of KOBO method. An assessment was made of the influence of extrusion process parameters on the mechanical properties and the structure of the alloys. On the basis of achieved results of mechanical properties for alloys AZ31 and WE43 the susceptibility of those alloys to plastic shaping was determined. Quantitative tests of structure assessment in case of alloys AZ61 and WE43 after extrusion with the use of KOBO method were conducted with the use of METILO program. It has been shown that extrusion AZ61,WE43 alloys method KOBO leads to considerable fragmentation of grains.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 545-550
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical validation of the method for measuring radius variations of components on the machine tool
Autorzy:
Adamczak, S.
Janusiewicz, A.
Makieła, W.
Stępień, K.
Powiązania:
https://bibliotekanauki.pl/articles/221018.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roundness
experimental method error
process tool
Opis:
This paper deals with the experimental validation of the suitability of the method for measuring radial variations of components on the process tool. The tests were conducted using a computerized PSA6, which was compared to a Talyrond 73. The results of measurement of roundness deviations as well as roundness profiles were analyzed for a sample of 70 shafts. The roundness deviations were assessed by determining the experimental errors, while the profiles obtained with the tested device were compared to those registered by the reference device using three correlation coefficients.
Źródło:
Metrology and Measurement Systems; 2011, 18, 1; 35-46
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of expectation maximization method for purchase decision-making support in welding branch
Autorzy:
Kujawińska, A.
Rogalewicz, M.
Diering, M.
Powiązania:
https://bibliotekanauki.pl/articles/407123.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cluster analysis
welding process
expectation
maximization method
Opis:
The article presents a study of applying the proposed method of cluster analysis to support purchasing decisions in the welding industry. The authors analyze the usefulness of the non-hierarchical method, Expectation Maximization (EM), in the selection of material (212 combinations of flux and wire melt) for the SAW (Submerged Arc Welding) method process. The proposed approach to cluster analysis is proved as useful in supporting purchase decisions.
Źródło:
Management and Production Engineering Review; 2016, 7, 2; 29-33
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nickel in Compacted Graphite Iron
Autorzy:
Gumienny, G.
Kurowska, B.
Szymczak, T.
Gawroński, J.
Powiązania:
https://bibliotekanauki.pl/articles/352803.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
compacted graphite iron
crystallization process
DTA method
Opis:
The paper presents results of the research work concerning effects of nickel concentration on the crystallization process, microstructure and selected properties of the compacted graphite iron. Compacted graphite in the cast iron was obtained with use of the Inmold process. The study has comprised the cast iron containing nickel up to concentration providing obtainment of austenitic microstructure of the matrix. The effect of the nickel on temperature of the eutectic crystallization was specified. It has been presented composition of the cast iron matrix in function of nickel concentration in a casting with wall thickness of 3 mm and 24 mm. Moreover, it has been presented conditions defining the possibility of obtaining an austenitic and martensitic compacted graphite iron. Effect of the nickel on hardness of the cast iron was described.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 657-662
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new look at some aspects of maintenance and improvement of production processes
Autorzy:
Hamrol, A.
Powiązania:
https://bibliotekanauki.pl/articles/407115.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
production process
strategy
method
tool
quality
maintenance
improvement
Opis:
The purpose of the paper is to present the author’s reflections on the origin and popularity of various approaches to maintenance and improvement of production processes, their terminological consistency, understanding, and practical application of their principles. The author’s reflections are based on his observations made over his many years of activity as a lecturer and consultant in the area of production engineering and management. It was shown that there is a need to make scientists and practitioners aware of the relatively large degree of freedom in defining the scope and way of application of strategies of continuous improvement. The author’s proposal is to refer to all approaches to maintenance and improvement of production processes with the title “Strategies of Efficient Action” and all supporting methods as “Practices of Efficient Action”. Considerations presented in the paper can be useful in more and more efficiently applying the power of TQM, Six Sigma, Lean Manufacturing and other strategies of processes maintenance and improvement in the daily activities of companies.
Źródło:
Management and Production Engineering Review; 2018, 9, 1; 34-43
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring and developing customer satisfaction – by balanced critical factor index
Autorzy:
Kuronen, M.
Takala, J.
Powiązania:
https://bibliotekanauki.pl/articles/406746.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
customer satisfaction
critical business process
balanced critical factor index
BCFI
method
Opis:
This short analysis presents perspective and a holistic method for approaching and measuring customer satisfaction. The Balanced Critical Factor Index (BCFI) method is a measurement tool to indicate which attribute of a business process is critical and which is not, based on the experience and expectations of the company’s employees, customers or business partners. This paper focuses on to detect and define critical business processes and factors, which have influence to effective co-operation and customer satisfaction. The use of a questionnaire is one of the most efficient approaches to gather the required information. Due to the fact that each process has its own attributes and the questionnaires cannot be standardized, but the information from the phase is essential and could be measured. In this study case company’s all gathered information will be analyzed and furthermore the BCFI measurement tools will be applied. The original research has been testified that, with the above-mentioned method (BCFI) customer’s experience of the “gap” between expected and received service can be easily resolved. Using this BCFI method it is also possible to find easier so called “weak” customer satisfaction indicators, which are not directly obvious. Companies have crucial to take the right decisions upon the areas of business interest. To have it done, the company should have able to made decisions with the right amount of customer’s needs. The correct allocation and fast adaption of customer’s needs with the right amount of standards is a key to competitive advantage. This paper shows use of this BCFI method and how it could help companies to define there’s customer’s needs and required development target area more specifically.
Źródło:
Management and Production Engineering Review; 2013, 4, 3; 34-39
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controlling the State of Residual Stresses in Railway Rails by Modifying Pass Design of Straightening Rollers
Autorzy:
Żak, Sylwester
Woźniak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/2203704.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
railway rail
residual stresses
straightening process
straightening rollers
strain gauge method
Opis:
The paper presents a summary of research on the possibility of influencing the state of residual stresses in railway rails by changing the pass design of vertical and horizontal straightener rollers and optimising their distribution on the rail perimeter. The presented results are devoted to the influence of profiled rollers on the level of residual stresses. A wide range of theoretical considerations were carried out based on the use of the finite element method using the commercial Forge software package. In order to verify the results of the theoretical considerations most reliably, a series of “in situ” experiments were conducted in industrial conditions on an existing production line. The tests were carried out on 120 meters long 60E1 railway rails. A significant reduction in the level of residual stresses compared to the standard requirements was achieved.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 57--70
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards developing a decision making tool for technology and knowledge priorities
Autorzy:
Takala, J.
Tilabi, S.
Powiązania:
https://bibliotekanauki.pl/articles/407245.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sense method
respond method
sustainable competitive advantage
SCA
knowledge and technology
KT
uncertainties
analytical hierarchy process
AHP
Opis:
The main focus of this paper is to propose a method for prioritizing knowledge and technology factor of firms towards sustainable competitive advantage. The data has been gathered and analyzed from two high tech start-ups in which technology and knowledge play major role in company’s success. The analytical hierarchy model (AHP) is used to determine competitive priorities of the firms. Then knowledge and technology part of sense and respond questionnaire is used to calculate the variability coefficient i.e. the uncertainty caused by technology and knowledge factor. The proposed model is tested in terms of two start-ups. Based on the initial calculation of uncertainties, some improvement plan is proposed and the method is applied again to see if the uncertainty of knowledge and technology decreases. In both cases, the proposed model helped to have a clear and precise improvement plan and led in reduction of uncertainty.
Źródło:
Management and Production Engineering Review; 2018, 9, 3; 33-40
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Al-Mg casting alloys crystallization with use of ATND method
Analiza krystalizacji odlewniczych stopów Al-Mg metodą ATND
Autorzy:
Ciućka, T.
Powiązania:
https://bibliotekanauki.pl/articles/175955.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting process
process theory
crystallization
ATD analysis
ATND method
proces odlewania
teoria procesu
krystalizacja
analiza ATD
metoda ATND
Opis:
The paper presents results of non-ferrous metals crystallization tests performed with use of the ATND method. Method of analysis of non-ferrous metals crystallization gives complete picture of arisen structural components of alloys. Particular structural components of alloys investigated with use of the ATND method were verified in x-ray microanalysis, what unequivocally confirmed their presence. Below are presented in graphical form (crystallization diagrams) results of crystallization process obtained from the ATND method. In crystallization diagrams of AG 10 and AG51 alloys are shown curves (thermal curve and its derivative, voltage curve and its derivative). Crystallizable individual structural components of the investigated alloys are reflected on curves of the method in form of characteristic peaks. The tests were performed with AG 10 and AG51 aluminum-magnesium casting alloys. Moreover, the paper presents structures of the investigated alloys with marked structural components identified with use of x-ray microanalysis.
W pracy przedstawiono analizę wyników badań metodą ATND procesu krystalizacji stopów metali nieżelaznych. Analiza procesu krystalizacji tych stopów umożliwia charakterystykę powstających składników fazowych ich mikrostruktury. Składniki fazowe mikrostruktury badanych stopów określone metodą ATND zweryfikowano metodą mikroanalizy rentgenowskiej. Przedstawiono krzywe krystalizacji stopów magnezu AG10 i AG51 w zależności od temperatury i czasu, określono efekty cieplne i napięciowe. Ustalone wartości temperatury i napięcia użyto w obliczeniach matematycznych, w analizie regresji w celu określenia wartości temperatury krystalizacji składników fazowych badanych stopów. Wykonano badania mikroskopowe stopów AG10 i AG51.
Źródło:
Advances in Manufacturing Science and Technology; 2013, 37, 1; 111-118
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of lean methods – a business game study in German companies
Autorzy:
Poetters, Patrick
Schmitt, Robert
Leyendecker, Bert
Powiązania:
https://bibliotekanauki.pl/articles/406774.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lean method
business game
process optimization
two proportions test
paired t-test
Opis:
Production companies face the challenge of choosing a suitable process optimization method from a variety of methods, even though their effect on operational processes is uncertain. This study shows, using a statistical hypothesis test, the impact of the methods Kanban and Standard Worksheet on an autonomous team in comparison to a team that applies these methods. For this purpose, 44 companies – of different size and operating in various industries – across Germany completed a business game and generated data regarding the KPIs adherence to delivery date, number of reworks and inventory costs. Based on these data, the team’s performance could be ascertained and compared with each other.
Źródło:
Management and Production Engineering Review; 2020, 11, 2; 3-10
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki wpływające na wskaźniki procesu nawęglania
The factors affecting the recarburization process indicators
Autorzy:
Janerka, K.
Szajnar, J.
Jezierski, J.
Bartocha, D.
Powiązania:
https://bibliotekanauki.pl/articles/379609.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nawęglanie stopu żelaza
parametry nawęglania
metody nawęglania
recarburization process
recarburization parameter
recarburization method
Opis:
W artykule przedstawiono czynniki wpływające na uzyskiwane wskaźniki nawęglania (szybkość i efektywność) w procesie wytapiania żeliwa. Analiza obejmuje rodzaj nawęglacza (antracyt, grafit naturalny i grafit syntetyczny , koks naftowy ) oraz wielkość cząstek. Kolejne czynniki rozpatrywane w pracy to metoda nawęglania (wprowadzanie nawęglacza do stałego wsadu i na powierzchnię kąpieli metalowej) oraz parametry ciekłego metalu (temperatura i skład chemiczny ). Analizę przeprowadzono w oparciu o wykonane eksperymenty , wyniki obliczeń symulacji komputerowych oraz dane literaturowe.
The article presents the factors affecting the carburizing rates obtained (rate and efficiency) during the process of melting cast iron. The analysis includes the recarburizer type (anthracite, natural and synthetic graphite, petroleum coke) and particle size. Further factors considered in work are the methods of recarburization (recarburizer introduction to a solid charge and on the surface of the metal bath) and the parameters of the melt (temperature and chemical composition). The analysis was based on experiments performed, the calculation results of computer simulations and literature data.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 89-96
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficiency analysis of railway turnout heating system with a melting snow model heated by classic and contactless heating method
Autorzy:
Flis, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/140565.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical heating
enthalpy method
experimental research
melting process
railway turnouts
thermal field
heat distribution
Opis:
Maintaining railway turnout operability is crucial for ensuring railway transport safety. Electric heating of railway turnouts is a significant technical and economic issue. The classical heating is characterised by high power consumption. For this reason, research is needed to optimise the current system. This paper presents results of a numerical analysis and of experimental researches. The numerical analysis was carried out using the ANSYS software. There was conducted a numerical comparative analysis of energy loss during heating performed using two different heaters. Including the classical method and a heater thermally insulated from a rail. In the first step, heating of a working space filled with a substitute snow model was considered. The snow-covered surface area was held within the working space of the turnout. It was assumed that the snow substitute material had thermal properties approximately the same as real light snow. It was also assumed that the material is in the solid state which would not undergo a phase change. In the next step, a real snow model that included the phase change process was taken into account. The energy efficiency and heat distribution in the turnout have been analysed and compared. The experimental researches were carried out in a physical model. The results showed that the use of a contactless heater results in creating a larger area over which emitted heat affected snow in the working space. Consequently, more snow was melted around the contactless heater than the classic one. This experimental observation supported the results of the numerical analyses presented previously.
Źródło:
Archives of Electrical Engineering; 2019, 68, 3; 511-520
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza pneumatycznych układów sterowania
Synthesis of pneumatic controll systems
Autorzy:
Nowak, D.
Więcławek, R.
Powiązania:
https://bibliotekanauki.pl/articles/383168.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
automatyzacja procesu odlewniczego
metoda MTS
układ pneumatyczny
cement production process
MTS method
pneumatic system
Opis:
Mechanizacja i automatyzacja procesów odlewniczych przynosi znaczne korzyści między innymi dzięki wzrostowi wydajności i jakości produkcji. Pomimo że obecnie podstawowym narzędziem automatyzacji procesów produkcyjnych są programowalne sterowniki logiczne PLC, w wielu obszarach, ze względu na swoje zalety, zastosowanie pneumatycznych układów sterowania może być bardziej uzasadnione. Jednak podstawowym czynnikiem decydującym o wyborze techniki sterowania są koszty. W przypadku układów pneumatycznych o kosztach decyduje liczba użytych elementów. Dlatego podczas prac projektowych istotne znaczenie ma wybór odpowiedniej metody syntezy pneumatycznych układów sterowania. W artykule przedstawiono metodę MTS opracowaną w Instytucie Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej do modelowania dyskretnych procesów technologicznych i programowania sterowników PLC, którą można także zastosować, po wprowadzeniu pewnych modyfikacji, do projektowania pneumatycznych układów sterowania. Istotnym elementem metody MTS jest sieć działań, która w sposób graficzny przedstawia algorytm realizowanego procesu. W oparciu o sieć działań i schemat funkcjonalny maszyny roboczej wyznacza się diagram stanów, który w sposób graficzny przedstawia przebieg zmian sygnałów wejściowych i wyjściowych układu sterowania. Analiza diagramu stanów, na podstawie opisanego algorytmu, pozwala w prosty sposób wyznaczyć równanie schematowe, które stanowi podstawę do realizacji układu sterowania. Istotną zaletą metody MTS jest brak ograniczeń odnośnie liczby sygnałów wejściowych i wyjściowych układu sterowania. Natomiast uzyskane rozwiązanie charakteryzuje się minimalną liczbą elementów potrzebnych do realizacji układu sterowania.
Currently, the basic tool for automating the production processes are the PLCs. However, in many areas application of the pneumatic control systems may be more reasonable. The main factor determining choice of the control technology are costs. In the case of pneumatic systems, the costs shall be determined by the number of elements used. Therefore, during the design works it is important to choose an appropriate method for the pneumatic control systems synthesis. The article presents the MTS method, which may be used for a discrete technological processes modeling and PLC programming, as well as for a pneumatic control systems designing. An important element of the MTS method is the network of actions, which graphically presents an algorithm of the implemented process. Based on the action network and operating machine’s functional diagram, the diagram of different states is determinated, which graphically shows changes of the control system’s input and output signals. Analysis of the diagram of different states, makes it easy to determine a schematic equation, which shall be the basis for the control system implementation. Advantage of the MTS method is the lack of restrictions on the number of the control system’s input and output signals. The resulting solution is characterized by a minimum number of elements needed to implement the control system.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 159-164
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of logic flow in planning and production control
Autorzy:
Ulewicz, R.
Jelonek, D.
Mazur, M.
Powiązania:
https://bibliotekanauki.pl/articles/407036.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
process identification
production system
lean manufacturing
Glenday’s sieve method
structural optimization
work organization
Opis:
The article presents the results of analysis, the use of continuous flow of logic at the stage of production planning and control of the company producing furniture. The concept of continuous flow tends to regulate the flow of materials in a manner that provides the shortest flow path without unnecessary activities (Muda is a Japanese word meaning waste), a constant takt and defined throughput at constant resource requirements for the so-called transfer of material through the whole process. In the study Glenday’d sieve method was used to identify the correct area, which requires the value stream mapping, and areas called excessive complexity, which do not provide added value. The use of Glenday’s sieve method made it possible to identify areas in which it must be improve production capacity.
Źródło:
Management and Production Engineering Review; 2016, 7, 1; 89-94
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The characteristics of the possibility of the use of polymer membranes in production of oxygen for energy processes
Charakterystyka możliwości wykorzystania membran polimerowych do produkcji tlenu dla procesów energetycznych
Autorzy:
Kotowicz, J.
Berdowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/172893.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
membrana polimerowa
produkcja tlenu
proces kriogeniczny
metoda hybrydowa
Aspen
polymeric membrane
oxygen production
cryogenic process
hybrid method
Opis:
In this paper, different methods of oxygen production are characterized. The main attention is focused on the use of polymer membranes. Hybrid method is proposed in the process of oxygen production. Membrane is used in the first stage of this method, while in the second one, the cryogenic process is chosen. The calculations of the membrane parameters have been made in Aspen software. The characteristic values for the membrane separation process such as oxygen recovery rate and permeate purity have been determined. Various systems have been analyzed. It has been calculated that energy consumption in the process of cryogenic oxygen production reaches 0.2 kWh/kgO2 or even 0.19 kWh/kgO2 in the membrane process using a vacuum pump, and in the near future, with the improvement of the membrane properties it will be limited to 0.15 kWh/kgO2.
W artykule scharakteryzowano różne metody produkcji tlenu. Główną uwagę skupiono na wykorzystaniu membran polimerowych. W procesie produkcji tlenu zaproponowano metodę hybrydową, w której w pierwszym stopniu stosuje się membranę, zaś w drugim proces kriogeniczny. Obliczenia membran wykonano przy wykorzystaniu programu Aspen. Wyznaczono charakterystyczne wielkości dla procesu separacji membranowej takie jak stopień odzysku tlenu i czystość permeatu. Analizowano różne układy. Obliczono, że przy zastosowaniu pompy próżniowej w procesie membranowym energochłonność kriogenicznego procesu wytwarzania tlenu może wynieść 0,2 kWh/kgO2 lub nawet 0,19 kWh/kgO2, zaś w najbliższej przyszłości wraz z polepszeniem się właściwości membran może być ograniczona do 0,15 kWh/kgO2.
Źródło:
Archiwum Energetyki; 2012, 42, 3/4; 57-70
0066-684X
Pojawia się w:
Archiwum Energetyki
Dostawca treści:
Biblioteka Nauki
Artykuł
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