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Tytuł:
The Lean Manufacturing tools in Polish foundries
Stan wykorzystania narzędzi Lean Manufacturing w polskich odlewniach
Autorzy:
Jezierski, J.
Janerka, K.
Powiązania:
https://bibliotekanauki.pl/articles/354204.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Lean Manufacturing
lean production
quality management
zarządzanie jakością
Opis:
The concept of Lean Manufacturing (or Lean Production) is widely present in the quality management systems of the best factories. Foundry plants in Poland have continuously been implementing modern management tools; however, the experiences of the authors show that the usage of lean tools is at a lower level in domestic foundries than in similar plants abroad. This was the reason why a survey was prepared and over 300 foundry plants were questioned regarding the application of Lean Manufacturing tools. The questions (20 in total) asked if and what tools are implemented in the plant and what benefits have been achieved, or why lean tools have not been implemented in a particular plant. The answers were thoroughly analysed and the results show that, among others, only 29% of all foundries use lean tools, and the main reason why most of them do not is that these tools are not understood well enough.
Koncepcja Lean Manufacturing (lub Lean Production) obecna jest szeroko w systemach zarządzania wiodących zakładów przemysłowych. W odlewnictwie, w tym polskim, również widoczny jest stały postęp we wdrażaniu nowoczesnych narzędzi zarządzania. Jednak doświadczenia autorów wskazują, że w aspekcie zastosowania narzędzi lean, polskie odlewnie odstają jednak od zagranicznych. Te spostrzeżenia były powodem podjęcia badań, ankietowych skierowanych do krajowych odlewni (ponad 300). Pytania (łącznie 20) dotyczyły głównie zagadnień, czy i jakie narzędzia lean są wykorzystywane w zakładzie, jakie są korzyści z ich stosowania lub też dlaczego takich narzędzi nie wdrożono. Odpowiedzi zostały starannie przeanalizowane a wyniki wskazują między innymi, że zaledwie 29% odlewni stosuje jakiekolwiek narzędzia lean a najczęstszym powodem ich niestosowania jest niewystarczające zrozumienie.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 3; 937-940
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Karty kontrolne narzędziem oceny zmienności procesu wytwarzania odlewów
Control Charts as the Tool for Assessment of the Variability of the Castings Manufacturing Process
Autorzy:
Brzeziński, M.
Smyksy, K.
Powiązania:
https://bibliotekanauki.pl/articles/381184.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odlewy
zarządzanie jakością
system MSA
karty kontrolne
castings
quality management
MSA system
checklists
Opis:
Szybko rozwijająca się gospodarka oraz ciągłe wzrastające wymagania klientów wymuszają na odlewniach nieustanną rywalizację o egzystencję i dalszy rozwój. Osiągnięcie tych dwóch podstawowych rzeczy, jest sprawą niezmiernie trudną. Zarząd odlewni staje przed skomplikowanymi decyzjami związanymi z maksymalizacją efektywności produkcji. Do takich decyzji należy m.in. wdrażanie nowych systemów czy też instrumentów zarządzania jakością. W artykule poddano analizie i ocenie system kontroli jakości odlewów oparty na kartach kontrolnych do pomiarów liczbowych [...].
Rapidly growing economy and the continuous increasing demands of customers force on foundry companies the ceaseless rivalry for existence and further development. Achieving these two basic aims is extremely difficult matter. Management of foundry is faced with complicated decisions connected with maximization of the production effectiveness. Such decisions include, among others, implementation of new systems or instruments of the quality management. The article analyzes and evaluates the quality control system of casting based on control charts of measurements [...]
Źródło:
Archives of Foundry Engineering; 2014, 14, 2 spec.; 7-10
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of changes in active binder content on the control system of the moulding sand quality
Autorzy:
Jakubski, J.
Dobosz, S. M.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/380300.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zarządzanie jakością
masa formierska
sztuczna sieć neuronowa
quality management
green moulding sands
artificial neural networks
Opis:
Artificial neural networks are one of the modern methods of the production optimisation. An attempt to apply neural networks for controlling the quality of bentonite moulding sands is presented in this paper. This is the assessment method of sands suitability by means of detecting correlations between their individual parameters. The presented investigations were aimed at the selection of the neural network able to predict the active bentonite content in the moulding sand on the basis of this sand properties such as: permeability, compactibility and the compressive strength. Then, the data of selected parameters of new moulding sand were set to selected artificial neural network models. This was made to test the universality of the model in relation to other moulding sands. An application of the Statistica program allowed to select automatically the type of network proper for the representation of dependencies occurring in between the proposed moulding sand parameters. The most advantageous conditions were obtained for the uni-directional multi-layer perception (MLP) network. Knowledge of the neural network sensitivity to individual moulding sand parameters, allowed to eliminate not essential ones.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 71-74
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of the Number of Eutectic Grains on Coating Growth During Hot Dip Galvanising of Ductile Iron Castings
Autorzy:
Kopyciński, D.
Guzik, E.
Szczęsny, A.
Powiązania:
https://bibliotekanauki.pl/articles/382107.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting quality management
zinc coating
ductile iron
eutectic grains
zarządzanie jakością odlewów
powłoka cynkowa
żeliwo sferoidalne
Opis:
Studies were conducted on a zinc coating produced on the surface of ductile iron grade EN-GJS-500-7 to determine the eutectic grain effect. For this purpose, castings with a wall thickness of 5 to 30 mm were made and the resulting structure was examined. To obtain a homogeneous metal matrix, samples were subjected to a ferritising annealing treatment. To enlarge the reaction surface, the top layer was removed from casting by machining. Then hot dip galvanising treatment was performed at 450°C to capture the kinetics of growth of the zinc coating (in the period from 60 to 600 seconds). Analysing the test results it was found that within the same time of hot dip galvanising, the differences in the resulting zinc coating thickness on samples taken from castings with different wall cross-sections were small but could, particularly for shorter times of treatment, reduce the continuity of the alloyed layer of the zinc coating.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1; 67-70
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of optical scanning for analysis of casting shape
Wykorzystanie skanowania optycznego do analizy kształtu odlewów
Autorzy:
Wieczorowski, M.
Grzelka, M.
Budzik, G.
Augustyn-Pieniazek, J.
Powiązania:
https://bibliotekanauki.pl/articles/379621.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
information technology
foundry industry
quality management
nondestructive testing
technologia informatyczna
przemysł odlewniczy
zarządzanie jakością
badania nieniszczące
Opis:
In the paper the use of optical scanning for inspection of casting shape and its accuracy was described. Optical system applied to digitization of objects determines all dimensions and shape of inspected object. This technology is used in quality control and reverse engineering. System is based on triangulation: sensor head performs projection of different patterns of fringes onto measured object and scanner tracks their distribution with two cameras. Basing on optical transform equations, a processing unit automatically and with remarkable accuracy calculates 3D coordinates for every pixel of camera. Depending on camera resolution the result of such a scan is a cloud of points with up to 5 million points for every image. In the paper examples of applications for castings with different designation was presented.
W artykule opisano wykorzystanie skanowania optycznego do kontroli dokładności wykonania odlewów. System optyczny stosowany do digitalizacji obiektów określa wszystkie wymiary i kształt badanego przedmiotu. Technologia ta wykorzystywana jest w kontroli jakości i w inżynierii odwrotnej. System bazuje na zasadzie triangulacji: głowica sensora dokonuje projekcji różnych układów prążków na obiekt mierzony a skaner obserwuje ich przebieg dwoma kamerami. Opierając się na równaniach transformacji optycznej, jednostka przetwarzająca automatycznie i z dużą dokładnością oblicza współrzędne 3D dla każdego piksela kamery. Zależnie od rozdzielczości kamery, wynikiem takiego skanu jest chmura do 4 milionów punktów dla każdego pojedynczego pomiaru. W artykule pokazano przykładowe zastosowanie skanera optycznego do pomiarów odlewów o różnym przeznaczeniu.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 217-221
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of the Return Material Implementation into the Production of Silumin Casts on Technological and Economic Indicators of Production Process
Autorzy:
Gaspar, S.
Majernik, J.
Trytek, A.
Podaril, M.
Benova, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2126917.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HPDC
product development
quality management
mechanical properties
castings defects
rozwój produktu
zarządzanie jakością
właściwości mechaniczne
wady odlewów
Opis:
The production of high pressure die casts also brings difficulties regarding the processing of the waste material. It is mainly formed by runners, overflows and other foundry supplements used and, in the case of machines using the cold chamber, also the remainder from this chamber. As this material is often returned to the production process, we refer to it as return material. In the production process, it is therefore essential to deal with the proportion issue of return material against primary material that can be added to the melt to maintain the required cast properties. The submitted article monitors the quality properties of the alloy, selected mechanical properties of casts and porosity depending on the proportion of the return material in the melt. At the same time, the material savings are evaluated with regards to the amount of waste and the economic burden of the foundries. To monitor the above-mentioned factors, series of casts were produced from the seven melting process variants with a variable ratio of return to the primary material. The proportion ratio of return material in the primary alloy was adjusted from 100% of the primary alloy to 100% of the return material in the melting process. It has been proven that with the increasing proportion of the return material, the chemical composition of the melt changes, the mechanical properties of the alloy decrease and the porosity of the casts increases. Based on the results of the tests and analyzes, the optimal ratio of return and primary material in the melting process has been determined. Considering the prescribed quality of the alloy and mechanical properties, concerning the economic indicator of the savings, the ratio is set at 70:30 [%] in favor of the primary material.
Źródło:
Archives of Foundry Engineering; 2022, 22, 1; 69--76
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality Management in the Manufacturing Process of Iron Casts on Foundry Lines
Autorzy:
Kukla, S.
Powiązania:
https://bibliotekanauki.pl/articles/379693.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quality management
foundry industry
production systems
production organization
costs estimation
zarządzanie jakością
przemysł odlewniczy
systemy produkcyjne
organizacja produkcji
Opis:
The paper presents issues of quality management related to iron casts manufactured on automated foundry lines for automobile industry. The influence of the choice of electric furnace and automated foundry line with vertical or horizontal mould division on the quality of casts made of nodular or grey cast iron was presented. Analysis of different scenarios of the course of action manufacturing processes was performed basing on a simulation experiment, record data related to the quality of the manufactured casts and manufacturing prime costs analysis. The research used universal tools applied in simulation analysis of production systems (Rockwell Automation: Arena Simulation Software) and a spreadsheet used for cast manufacture cost estimation. The proposed variants have been assessed using the Pareto analysis on the basis of results of reports generated for a simulation experiment. The paper also presents suggestions of activities aimed at further improvement of the quality of foundry processes.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 13-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Baza danych technologii w odlewniach żeliwa i staliwa z wykorzystaniem systemu SimulationDB
Database of Technologies in Cast Iron and Steel Foundries Using SimulationDB System
Autorzy:
Malinowski, P.
Suchy, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/380162.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
komputerowe wspomaganie
produkcja odlewnicza
zarządzanie jakością odlewów
technologiczna baza wiedzy
zarządzanie odlewnią
computer support
casting production
casting quality management
knowledge database
foundry management
Opis:
Dotychczasowy sposób przechowywania danych technologicznych w postaci zdjęć, animacji, wykresów, zestawów parametrów, wyników symulacji, danych produkcyjnych umieszczonych w określonej strukturze katalogów uniemożliwia przetwarzanie i powtórne wykorzystanie tych informacji. Rosnąca w szybkim tempie liczba wykonywanych symulacji w branży odlewniczej powoduje generowanie bardzo dużej ilości cyfrowych danych liczonych w terabajtach, które należy odpowiednio przetworzyć i zinterpretować – natychmiast reagując na powstałe nieprawidłowości podczas procesu zalewania i/lub krzepnięcia odlewu. Mogą to jedynie wykonać wysoko wyspecjalizowani inżynierowie-eksperci. Ich wiedza, doświadczenie praktyczne i umiejętność posługiwania się nowatorskimi narzędziami inżynierskimi, wspomagającymi różne etapy przygotowania produkcji decyduje o szybkości przygotowania technologii przy zachowaniu parametrów jakościowych i wytrzymałościowych. Umiejętnie spisana wiedza praktyczna, opis postępowania technologa, wyniki symulacji oraz cały proces produkcji odlewniczej zawarte w technologicznej bazie wiedzy SimulationDB tworzą niezbędne narzędzie nowoczesnego technologa. Wykorzystanie wiedzy technologicznej zawartej w systemie SimulationDB umożliwia szybsze opracowanie technologii, skuteczne rozwiązywanie problemów technologicznych, szkolenie kadry specjalistów, co w efekcie tworzy dodatkową wartość dodaną.
The method used so far for storing technological data – i.e. images, animations, charts, sets of parameters, simulation results and production data contained in a defined directory structure makes processing and re-using this information basically impossible. The number of simulations carried out in the casting industry is growing very rapidly. This generates terabytes of digital data that need to be processed and interpreted properly, as irregularities arising during the process of pouring and/or solidification of the casting have to be addressed immediately. Only highly-specialized engineers/experts can perform these tasks. Their knowledge, experience and ability to use innovative engineering tools, that support various stages of the production preparation process, are crucial factors determining how fast a technology can be developed in compliance with the given quality and strength parameters. An appropriate record of practical knowledge, technologists’ guidance, simulation results, as well as the entire process of casting production, that are included in the technological knowledge base SimulationDB, provide for an essential tool of a modern technologist. The use of technological knowledge provided by the SimulationDB system allows for faster development of technologies, effective problem-solving in technological processes, and training of specialists. As a result, this all creates additional added value.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3 spec.; 117-122
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size of Non-Metallic Inclusions in High-Grade Medium Carbon Steel
Autorzy:
Lipiński, T.
Wach, A.
Powiązania:
https://bibliotekanauki.pl/articles/381358.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quality management
environment protection
high-grade steel
steel
non-metallic inclusions
quantitative metallography
zarządzanie jakością
ochrona środowiska
stal wysokiej jakości
Opis:
Non-metallic inclusions found in steel can affect its performance characteristics. Their impact depends not only on their quality, but also, among others, on their size and distribution in the steel volume. The literature mainly describes the results of tests on hard steels, particularly bearing steels. The amount of non-metallic inclusions found in steel with a medium carbon content melted under industrial conditions is rarely presented in the literature. The tested steel was melted in an electric arc furnace and then desulfurized and argon-refined. Seven typical industrial melts were analyzed, in which ca. 75% secondary raw materials were used. The amount of non-metallic inclusions was determined by optical and extraction methods. The test results are presented using stereometric indices. Inclusions are characterized by measuring ranges. The chemical composition of steel and contents of inclusions in every melts are presented. The results are shown in graphical form. The presented analysis of the tests results on the amount and size of non-metallic inclusions can be used to assess the operational strength and durability of steel melted and refined in the desulfurization and argon refining processes.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4; 55-60
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of a Production System in the Process of Remelting of Post-Reduction Slag by Applying New Physical and Chemical Conditions
Autorzy:
Bydałek, A. W.
Wołczyński, W.
Wędrychowicz, M.
Holtzer, M.
Basiura, B.
Palimąka, P.
Powiązania:
https://bibliotekanauki.pl/articles/379861.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
product development
quality management
decopperisation process
flash smelting slag
production system optimisation
rozwój produktu
zarządzanie jakością
proces odmiedziowania
żużel zawiesinowy
Opis:
Production processes at KGHM are complex and require from customers products of constantly higher quality at relatively lowest prices. Such situation results in an increase of the importance of optimisation of processes. As products and technologies change rapidly, technologists at the plant in Głogów have less time to achieve optimisation basing on own experiences. Analysing a particular process, we can e.g. detect occurring disturbances, find factors having an influence on quality problems, select optimal settings or compare various production procedures. Analysis of the course of production process is the basis of process optimisation. One optimisation in case of the process of decopperisation of flash slag can be a change of a technological additive to a less energy-consuming one, and its final result can be an improvement of the productivity index, a change of the relation between final effects and born expenditures, as well as optimisation of production costs.
Źródło:
Archives of Foundry Engineering; 2018, 18, 4; 5-8
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the training set value on the quality of the neural network to identify selected moulding sand properties
Autorzy:
Jakubski, J.
Dobosz, S. M.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/381338.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
information technology
foundry industry
quality management
green moulding sands
neural network
technologia informacyjna
przemysł odlewniczy
zarządzanie jakością
masa formierska
sieć neuronowa
Opis:
Artificial neural networks are one of the modern methods of the production optimisation. An attempt to apply neural networks for controlling the quality of bentonite moulding sands is presented in this paper. This is the assessment method of sands suitability by means of detecting correlations between their individual parameters. This paper presents the next part of the study on usefulness of artificial neural networks to support rebonding of green moulding sand, using chosen properties of moulding sands, which can be determined fast. The effect of changes in the training set quantity on the quality of the network is presented in this article. It has been shown that a small change in the data set would change the quality of the network, and may also make it necessary to change the type of network in order to obtain good results.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 49-52
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy
Autorzy:
Górny, M.
Sikora, G.
Kawalec, M.
Powiązania:
https://bibliotekanauki.pl/articles/381182.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quality management
Al-Cu alloy
fading effect
primary grains of α(Al)
zarządzanie jakością
metalografia
stop Al-Cu
zanik
ziarna pierwotne
Opis:
The present research was conducted on thin-walled castings with 5 mm wall thicknesses. This study addresses the effect of the influence of different master alloys, namely: (1) Al-5%Ti-1%B, (2) Al-5%Ti and (3) Al-3%B, respectively on the structure and the degree of undercooling (ΔTα = Tα-Tmin, where Tα - the equilibrium solidification temperature, Tmin - the minimum temperature at the beginning of α(Al) solidification) of an Al-Cu alloy. The process of fading has been investigated at different times spent on the refinement treatment ie. from 3, 20, 45 and 90 minutes respectively, from the dissolution of master alloys. A thermal analysis was performed (using a type-S thermocouple) to determine cooling curves. The degree of undercooling and recalescence were determined from cooling and solidification curves, whereas macrostructure characteristics were conducted based on a metallographic examination. The fading effect of the refinement of the primary structure is accompanied by a significant change in the number (dimension) of primary grains, which is strongly correlated to solidification parameters, determined by thermal analysis. In addition to that, the analysis of grain refinement stability has been shown with relation to different grain refinements and initial titanium concentration in Al-Cu base alloy. Finally, it has been shown that the refinement process of the primary structure is unstable and requires strict metallurgical control.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosis of Missed Ductile Iron Melts with Process Modelling
Autorzy:
Perzyk, M.
Werlaty, M.
Powiązania:
https://bibliotekanauki.pl/articles/382916.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quality management
information technology
foundry industry
process fault diagnosis
ductile iron melting
data driven model
zarządzanie jakością
technologia informacyjna
przemysł odlewniczy
diagnostyka uszkodzeń
topienie żeliwa
Opis:
The paper presents an application of advanced data-driven (soft) models in finding the most probable particular causes of missed ductile iron melts. The proposed methodology was tested using real foundry data set containing 1020 records with contents of 9 chemical elements in the iron as the process input variables and the ductile iron grade as the output. This dependent variable was of discrete (nominal) type with four possible values: ‘400/18’, ‘500/07’, ‘500/07 special’ and ‘non-classified’, i.e. the missed melt. Several types of classification models were built and tested: MLP-type Artificial Neural Network, Support Vector Machine and two versions of Classification Trees. The best accuracy of predictions was achieved by one of the Classification Tree model, which was then used in the simulations leading to conversion of the missed melts to the expected grades. Two strategies of changing the input values (chemical composition) were tried: content of a single element at a time and simultaneous changes of a selected pair of elements. It was found that in the vast majority of the missed melts the changes of single elements concentrations have led to the change from the non-classified iron to its expected grade. In the case of the three remaining melts the simultaneous changes of pairs of the elements’ concentrations appeared to be successful and that those cases were in agreement with foundry staff expertise. It is concluded that utilizing an advanced data-driven process model can significantly facilitate diagnosis of defective products and out-of-control foundry processes.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 123-126
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk Assessment of Defect Occurrences in Engine Piston Castings by FMEA Method
Autorzy:
Piątkowski, J.
Kamiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/381883.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting defects
casting quality management
Pareto-Lorenz method
FMEA process
failure risk score
wady odlewu
zarządzanie jakością odlewów
metoda Pareto-Lorenza
proces FMEA
ryzyko uszkodzeń
Opis:
The FMEA (Failure Mode and Effects Analysis) method consists in analysis of failure modes and evaluation of their effects based on determination of cause-effect relationships for formation of possible product or process defects. Identified irregularities which occur during the production process of piston castings for internal combustion engines were ordered according to their failure rates, and using Pareto-Lorenz analysis, their per cent and cumulated shares were determined. The assessments of risk of defects occurrence and their causes were carried out in ten-point scale of integers, while taking three following criteria into account: significance of effects of the defect occurrence (LPZ), defect occurrence probability (LPW) and detectability of the defect found (LPO). A product of these quantities constituted the risk score index connected with a failure occurrence (a so-called “priority number,” LPR). Based on the observations of the piston casting process and on the knowledge of production supervisors, a set of corrective actions was developed and the FMEA was carried out again. It was shown that the proposed improvements reduce the risk of occurrence of process failures significantly, translating into a decrease in defects and irregularities during the production of piston castings for internal combustion engines.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 107-110
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
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