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Wyświetlanie 1-15 z 23
Tytuł:
Mathematical Programming for Lot Sizing and Production Scheduling in Foundries
Autorzy:
Duda, J.
Stawowy, A.
Basiura, R.
Powiązania:
https://bibliotekanauki.pl/articles/380801.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technology
foundry industry
production planning
scheduling
zastosowanie technologii informatycznych
przemysł odlewniczy
planowanie produkcji
Opis:
The problem considered in the paper is motivated by production planning in a foundry equipped with the furnace and casting line, which provides a variety of castings in various grades of cast iron/steel for a large number of customers. The quantity of molten metal does not exceed the capacity of the furnace, the load is a particular type of metal from which the products are made. The goal is to create the order of the melted metal loads to prevent delays in delivery of goods to customers. This problem is generally considered as a lot-sizing and scheduling problem. The paper describes a mathematical programming model that formally defines the optimization problem and its relaxed version that is based on the conception of rolling-horizon planning.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 17-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Decision Support System in the Domain of Casting Defects Diagnosis
Autorzy:
Wilk-Kołodziejczyk, D.
Rojek, G.
Regulski, K.
Powiązania:
https://bibliotekanauki.pl/articles/947573.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technology
foundry industry
castings defects
diagnosis
zastosowanie technologii informatycznych
przemysł odlewniczy
wady odlewów
Opis:
This article presents a computer system for the identification of casting defects using the methodology of Case-Based Reasoning. The system is a decision support tool in the diagnosis of defects in castings and is designed for small and medium-sized plants, where it is not possible to take advantage of multi-criteria data. Without access to complete process data, the diagnosis of casting defects requires the use of methods which process the information based on the experience and observations of a technologist responsible for the inspection of ready castings. The problem, known and studied for a long time, was decided to be solved with a computer system using a CBR (Case-Based Reasoning) methodology. The CBR methodology not only allows using expert knowledge accumulated in the implementation phase, but also provides the system with an opportunity to "learn" by collecting new cases solved earlier by this system. The authors present a solution to the system of inference based on the accumulated cases, in which the main principle of operation is searching for similarities between the cases observed and cases stored in the knowledge base.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 107-110
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of the Efficiency of Polish Foundries Using Data Envelopment Analysis
Autorzy:
Stawowy, A.
Duda, J.
Powiązania:
https://bibliotekanauki.pl/articles/379915.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
benchmarking
data analysis
application of information technology
efficiency
przemysł odlewniczy
analiza danych
zastosowanie technologii informacyjnch
efektywność
Opis:
The article presents a study on the effectiveness of the foundries using Data Envelopment Analysis (DEA) method. The aim of the article is to analyze the usefulness of DEA method in the study of the relative efficiency of the foundries. DEA is a benchmarking technique based on linear programming to evaluate the effectiveness of the analyzed objects. The research was conducted in four Polish and two foreign plants. Evaluated foundries work in similar markets and have similar production technology. We created a DEA model with two inputs (fixed assets and employment) and one output (operating profit). The model was produced and solved using Microsoft Excel together with its Solver add-in. Moreover, we wrote a short VBA script to perform automating calculations. The results of our study include a benchmark and foundries’ ranking, and directions to improve the efficiency of inefficient units. Our research has shown that DEA can be a very valuable method for evaluating the efficiency of foundries.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 223-227
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated Analytical and Measurement System for the Evaluation of the Properties of Cast Metals and Alloys
Autorzy:
Biernat, S.
Bydałek, A. W.
Powiązania:
https://bibliotekanauki.pl/articles/380877.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
solidification process
brass
hardness
przemysł odlewniczy
zastosowanie technologii informatycznych
krzepnięcie
mosiądz
twardość
Opis:
The article presents an integrated analytical and measurement system for evaluation of the properties of cast metals and alloys. The presented platform is an extension of the SLAG - PROP application with new modules, which allow to use information on metallurgical processes in an even more effective way, as well as to evaluate the finished product. In addition, the construction of a measuring station for the analysis of thermal processes taking place in a metal bath allows for precise observation of phenomena together with their appropriate interpretation. The article presents not only the cooling curves of certain copper alloys. The analysis also covered mechanical properties related to hardness, finished products depending on the mold in which the products were cast. In the literature one can find information about the mechanical properties of products in the improved state, usually after plastic or thermal treatment, omitting their properties obtained as a result of a naturally made casting. The article also presents the method of placing information in the database using a convenient graphical tool.
Źródło:
Archives of Foundry Engineering; 2019, 1; 13-18
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production Scheduling for the Two Furnaces – One Casting Line System
Autorzy:
Stawowy, A.
Duda, J.
Powiązania:
https://bibliotekanauki.pl/articles/383276.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heuristics
application of information technology
foundry industry
scheduling
production planning
heurystyka
zastosowanie technologii informatycznej
przemysł odlewniczy
planowanie
planowanie produkcji
Opis:
The paper presents a production scheduling problem in a foundry equipped with two furnaces and one casting line, where the line is a bottleneck and furnaces, of the same capacity, work in parallel. The amount of produced castings may not exceed the capacity of the line and the furnaces, and their loads determine metal type from which the products are manufactured on the casting line. The purpose of planning is to create the processing order of metal production to prevent delays in the delivery of the ordered products to the customers. The problem is a mix of a lot-sizing and scheduling problems on two machines (the furnaces) run in parallel. The article gives a mathematical model that defines the optimization problem, and its relaxed version based on the concept of a rolling-horizon planning. The proposed approaches, i.e. commercial solver and Iterated Local Search (ILS) heuristic, were tested on a sample data and different problem sizes. The tests have shown that rolling horizon approach gives the best results for most problems, however, developed ILS algorithm gives better results for the largest problem instances with tight furnace capacity.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 43-48
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Thermal Stresses in Components of Pallets Operating in Furnaces for the Carburising Treatment
Autorzy:
Bajwoluk, A.
Gutowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/380818.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
pallet
heat flow
thermal stresses
przemysł odlewniczy
zastosowanie technologii informatycznych
przepływ ciepła
naprężenia
Opis:
The study is devoted to an analysis of thermal stresses arising in the basic elements of pallets used in furnaces for the carburising treatment. The construction of a pallet was presented and an example of its operating cycle was described. Using finite element method, a simulation analysis of the kinetics of cooling and heating of selected pallet components was performed. The results obtained were verified experimentally and used as a basis for the analysis of thermal stresses generated in these components during their cooling.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 175-180
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of Business Rules to Production Management in Foundries
Autorzy:
Stawowy, A.
Duda, J.
Wrona, R.
Powiązania:
https://bibliotekanauki.pl/articles/383187.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technology
foundry industry
operation management
business rules
zastosowanie technologii informatycznych
przemysł odlewniczy
zarządzanie operacyjne
reguły biznesowe
Opis:
The size and complexity of decision problems in production systems and their impact on the economic results of companies make it necessary to develop new methods of solving these problems. One of the latest methods of decision support is business rules management. This approach can be used for the quantitative and qualitative decision, among them to production management. Our study has shown that the concept of business rules BR can play at most a supporting role in manufacturing management, but alone cannot form a complete solution for production management in foundries.
Źródło:
Archives of Foundry Engineering; 2016, 16, 1; 85-88
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coordinated Production Planning and Scheduling Problem in a Foundry
Autorzy:
Stawowy, A.
Duda, J.
Powiązania:
https://bibliotekanauki.pl/articles/381726.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
production planning
scheduling
heuristics
przemysł odlewniczy
zastosowanie technologii informatycznych
planowanie produkcji
planowanie skoordynowane
Opis:
In the paper, we present a coordinated production planning and scheduling problem for three major shops in a typical alloy casting foundry, i.e. a melting shop, molding shop with automatic line and a core shop. The castings, prepared from different metal, have different weight and different number of cores. Although core preparation does not required as strict coordination with molding plan as metal preparation in furnaces, some cores may have limited shelf life, depending on the material used, or at least it is usually not the best organizational practice to prepare them long in advance. Core shop have limited capacity, so the cores for castings that require multiple cores should be prepared earlier. We present a mixed integer programming model for the coordinated production planning and scheduling problem of the shops. Then we propose a simple Lagrangian relaxation heuristic and evolutionary based heuristic to solve the coordinated problem. The applicability of the proposed solution in industrial practice is verified on large instances of the problem with the data simulating actual production parameters in one of the medium size foundry.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 133-138
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of the Casting Technology in the Bronze Age on the Basis of Investigations and Visualisation of Casting Moulds
Autorzy:
Garbacz-Klempka, A.
Kwak, Z.
Żak, P. L.
Szucki, M.
Ścibior, D.
Stolarczyk, T.
Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/381850.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technology
foundry industry
archaeometallurgy
casting moulds
bronze
XRF
zastosowanie technologii informatycznych
przemysł odlewniczy
archaeometalurgia
formy odlewnicze
brąz
Opis:
During excavation of the cremation cemetery of urnfield culture in Legnica at Spokojna Street (Lower Silesia, Poland), dated to 1100-700 BC, the largest - so far in Poland – a collection of casting moulds from the Bronze Age was discovered: three moulds for axes casting made out of stone and five moulds for casting sickles, razors, spearhead and chisels, made out of clay. This archaeological find constituted fittings of foundrymen’s graves. In order to perform the complete analysis of moulds in respect of their application in the Bronze Age casting technology analytical methods, as well as, computer aided methods of technological processes were used. Macroscopic investigations were performed and the X-ray fluorescence spectrometry method was used to analyse the chemical composition and metal elements content in mould cavities. Moulds were subjected to three-dimensional scanning and due to the reverse engineering the geometry of castings produced in these moulds were obtained. The gathered data was used to perform design and research works by means of the MAGMA5 software. Various variants of the pouring process and alloys solidification in these archaeological moulds were simulated. The obtained results were utilised in the interpretation of the Bronze Age casting production in stone and clay moulds, with regard to their quality and possibility of casting defects occurrence being the result of these moulds construction. The reverse engineering, modelling and computer simulation allowed the analysis of moulds and castings. Investigations of casting moulds together with their digitalisation and reconstruction of casting technology, confirm the high advancement degree of production processes in the Bronze Age.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 184-190
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Stresses in the Accessories of Heat Treatment Furnaces vs Cooling Kinetics
Autorzy:
Bajwoluk, A.
Gutowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/382585.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
information technology
grates
thermal stresses
heat treatment equipment
przemysł odlewniczy
zastosowanie technologii informatycznej
technologia informatyczna
ruszty
naprężenia termiczne
sprzęt do obróbki cieplnej
Opis:
Depending on the course of the processes of heat treatment and thermo-chemical treatment, the technological equipment of heat treatment furnaces is exposed to different operating conditions, as the said processes differ among themselves in the temperature of annealing and atmosphere prevailing in the furnace chamber, in the duration of a single work cycle and in the type and temperature of the coolant. These differences affect the magnitude of stresses occurring in each cycle of the operation of furnace accessories, and thus play an important role in fatigue processes leading to the destruction of these accessories. The kinetics of temperature changes during each cooling process plays an important role in the formation of thermal stresses on the cross-section of the cooled parts. It depends on many factors, including the initial cooling temperature, the type and temperature of the cooling medium, or the dimensions and shape of the object. This article presents a numerical analysis of the effect of the initial temperature on the distribution of stresses on the cross-section of the grate ribs, generated in the first few seconds of the cooling process carried out in two cooling media, i.e. hardening oil and water. The analysis was carried out by the finite element method, based on the results of experimental testes of temperature changes in the rib during its cooling.
Źródło:
Archives of Foundry Engineering; 2019, 3; 88-93
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Implementation of Computer Platform for Foundries Cooperating in a Supply Chain
Autorzy:
Wilk-Kołodziejczyk, D.
Kluska-Nawarecka, S.
Rojek, G.
Regulski, K.
Powiązania:
https://bibliotekanauki.pl/articles/382875.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technology
foundry industry
innovative foundry technologies
innovative materials
multi-agent technology
production support
zastosowanie technologii informatycznych
przemysł odlewniczy
innowacyjne technologie odlewnicze
materiały innowacyjne
wsparcie produkcji
Opis:
This article presents a practical solution in the form of implementation of agent-based platform for the management of contracts in a network of foundries. The described implementation is a continuation of earlier scientific work in the field of design and theoretical system specification for cooperating companies [1]. The implementation addresses key design assumptions - the system is implemented using multi-agent technology, which offers the possibility of decentralisation and distributed processing of specified contracts and tenders. The implemented system enables the joint management of orders for a network of small and medium-sized metallurgical plants, while providing them with greater competitiveness and the ability to carry out large procurements. The article presents the functional aspects of the system - the user interface and the principle of operation of individual agents that represent businesses seeking potential suppliers or recipients of services and products. Additionally, the system is equipped with a bi-directional agent translating standards based on ontologies, which aims to automate the decision-making process during tender specifications as a response to the request.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 111-116
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-Criterion Assessment of Different Variants of Casts Manufacturing Processes
Autorzy:
Kukla, S.
Powiązania:
https://bibliotekanauki.pl/articles/381235.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technology
foundry industry
automation in foundry
robotics in foundry
zastosowanie technologii informatycznych
przemysł odlewniczy
automatyka w odlewnictwie
robotyka w odlewnictwie
Opis:
The paper presents the issue of production processes improvement in foundries in the area of finishing treatment of iron casts manufactured on automated foundry lines with vertical or horizontal mould division. Due to numerous factors which influence the efficiency of the processes, multi-criterion assessment tools were proposed in order to select the optimal solution for the assumed criteria. After determining the criteria weight using the Saaty method, a simulation experiment was designed and carried out which presents possible scenarios of casts finishing treatment operations. Basing on experiment reports from a computer model, particular solutions were evaluated using the Yager’s method. The evaluation of the experiment results was performed by experts who assessed different options according to each of the criteria adopted. After the establishment of the total standardized ratings by averaging the scores given by individual experts, the final decision was generated. Using the presented method, the best solution was chosen from among the analyzed scenarios.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 47-50
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Verification of the Cast Iron Solidification Model
Autorzy:
Mendakiewicz, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2174627.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
solidification process
numerical techniques
thermal analysis
derivative analysis
przemysł odlewniczy
zastosowanie technologii informatycznych
krzepnięcie
techniki numeryczne
analiza termiczna
Opis:
The article concerns the experimental verification of the numerical model simulating the solidification and cooling processes proceeding in the domain of cast iron casting. The approximate course of the function describing the evolution of latent heat and the value of substitute specific heat resulting from its course were obtained using the thermal and derivative analysis (TDA) method The TDA was also used to measure the cooling curves at the distinguished points of the casting. The results obtained in this way were compared with the calculated cooling curves at the same points. At the stage of numerical computations, the explicit scheme of the finite difference method was applied. The agreement between the measured and calculated cooling curves is fully satisfactory.
Źródło:
Archives of Foundry Engineering; 2022, 22, 3; 91--94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shrinkage Porosity Criterion and Its Application to A 5.5 Ton Steel Ingot
Autorzy:
Zhang, C.
Bao, Y.
Wang, M.
Zhang, L.
Powiązania:
https://bibliotekanauki.pl/articles/382021.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
quality management
shrinkage porosity
ingot solidification
application of information technology
numerical simulation
przemysł odlewniczy
zarządzanie jakością
porowatość
krzepnięcie
zastosowanie technologii informatycznych
symulacja numeryczna
Opis:
In order to predict the distribution of shrinkage porosity in steel ingot efficiently and accurately, a criterion R√L and a method to obtain its threshold value were proposed. The criterion R√L was derived based on the solidification characteristics of steel ingot and pressure gradient in the mushy zone, in which the physical properties, the thermal parameters, the structure of the mushy zone and the secondary dendrite arm spacing were all taken into consideration. The threshold value of the criterion R√L was obtained with combination of numerical simulation of ingot solidification and total solidification shrinkage rate. Prediction of the shrinkage porosity in a 5.5 ton ingot of 2Cr13 steel with criterion R√L>0.21 m･℃1/2･s-3/2 agreed well with the results of experimental sectioning. Based on this criterion, optimization of the ingot was carried out by decreasing the height-to-diameter ratio and increasing the taper, which successfully eliminated the centreline porosity and further proved the applicability of this criterion.
Źródło:
Archives of Foundry Engineering; 2016, 16, 2; 27-32
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heuristic Model of the Mechanical Properties of a Hypoeutectic EN AC-42100 (EN AC-AlSi7Mg0.3) Silumin Alloy Subjected to Heat Treatment
Autorzy:
Górny, Z.
Kluska-Nawarecka, S.
Czekaj, E.
Wilk-Kołodziejczyk, D.
Saja, K.
Powiązania:
https://bibliotekanauki.pl/articles/383182.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
information technology
application of information technology
foundry industry
silumin alloy
mechanical properties
heat treatment
fuzzy logic
artificial intelligence
technologie informatyczne
zastosowanie technologii informatycznych
przemysł odlewniczy
silumin
właściwości mechaniczne
obróbka cieplna
sztuczna inteligencja
Opis:
The object of the experimental studies was to determine the mechanical properties of a hypoeutectic EN AC - 42100 (EN ACAlSi7Mg0,3) silumin alloy, where the said properties are changing as a result of subjecting the samples of different types to solution treatment. An important aspect of the studies was the use type of device for the heat treatment. As a basic parameter representing the mechanical properties, the tensile strength of the metal (Rm) was adopted.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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