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1
Content available Investigations Concerning Improvements of the Knock Out Property of Ceramic Moulds Applied in the Investment Casting Technology
Kolczyk-Tylka Joanna, Zych Jerzy
Archives of Foundry Engineering
|
2023
|
Vol. 23, iss. 4
34--39
EN
In lost wax technology, self-supporting ceramic moulds are made, which must have adequate strength after being filled with liquid metal. The final structural strength is determined by such factors as the thickness of the individual layers applied to the wax model resulting from the viscosity of the liquid mass, the specific strength of the layers formed, and the heat treatment of the moulds. The development of technology and materials is moving in the direction of increasing the specific strength of self-supporting ceramic moulds. The consequence of this is that the final strength of these moulds is too high, making it difficult to knock castings out of the moulds. Removing mould remnants from holes, closed spaces of the casting, corners, sharp edges, variable cross sections and etc. is cumbersome. In order to remove mould remnants from the casting, a method is used to dissolve them in heated solutions of suitable chemical composition and reaction. The paper presents the results of research on a new solution, the essence of which is the production of layers in a ceramic mould, in the middle zone of the mould, characterized by a significantly reduced final strength, achieved after firing. These layers are produced using a different liquid ceramic mass than the base one, based on an organic binder. As a result, thanks to the embedded layer, very good knock-out of castings is achieved and separation of residual ceramic mass. Special layers can be incorporated over the entire surface or only in those places where the bonding of the casting surface and ceramic mass occurs.
2
Content available remote The use of 3D printing technologies in art casting
Mikulíková Aleksandra, Wyleżoł Marek
Mechanik
|
2020
|
R. 93, nr 5-6
40--43
EN
The paper presents one of the roles of additive manufacturing used for preparing an art casting. Based on the virtual model (CAD), a casting pattern was 3D printed, based on which the wax pattern was made and in the final step an art casting was made.
PL
W artykule zaprezentowano przykład zastosowania technologii druku 3D w odlewnictwie artystycznym. Opisany proces bazuje na przygotowaniu wirtualnego modelu CAD, następnie na jego podstawie wydrukowany zostaje model 3D, który służy jako wzór do wytworzenia modeli woskowych, a w ostatnim etapie – odlewu artystycznego.
3
Content available Corrosion Resistance of Co-Cr-Mo Alloy Used in Dentistry
Łukaszczyk A., Augustyn-Pieniążek J.
Archives of Metallurgy and Materials
|
2015
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Vol. 60, iss. 1
523--528
EN
The presented paper studies the effect of the casting technology on the corrosion resistance of Co-Cr-Mo alloy. The investigations were conducted on a commercial alloy with the brand name ARGELOY N.P SPECIAL (Co-Cr-Mo) produced by Argen as well as the same alloy melted and cast by the lost wax casting method performed by a dental technician. The corrosion behavior of the dental alloys in an artificial saliva was studied with the use of the following electrochemical techniques: open circuit potential and voltammetry. After the electrochemical tests, studies of the surface of the examined alloys were performed by means of a scanning electron microscope with an X-ray microanalyzer. The results of the electrochemical studies show that the dependence of the corrosion resistance on the microstructure associated with the recasting process is marginal. The results of the electrochemical studies of the considered alloy clearly point to their good corrosion resistance in the discussed environment.
PL
Zbadano wpływ technologii odlewania na odporność korozyjną stopu Co-Cr-Mo. Badaniom poddano stop komercyjny o nazwie handlowej ARGELOY N.P SPECIAL (Co-Cr-Mo) firmy Argen oraz ten sam stop przetopiony i odlany przez technika dentystycznego metodą traconego wosku. Zachowanie korozyjne badanego stopu w środowisku sztucznej śliny zostało zbadane przy użyciu technik elektrochemicznych: pomiaru potencjału bezprądowego, woltamperometrii cyklicznej. Po przeprowadzeniu badań elektrochemicznych wykonano badania powierzchni badanego stopu przy pomocy elektronowego mikroskopu skaningowego z mikroanalizatorem rentgenowskim. Wyniki badań elektrochemicznych wskazują, że na odporność korozyjną oraz mikrostrukturę stopu proces powtórnego odlania wpływa jedynie w niewielkim stopniu. Wyniki badań elektrochemicznych rozpatrywanego stopu wskazują jednoznacznie na ich dobrą odporność korozyjną w rozpatrywanym środowisku.
4
Content available Ceramic Moulds for Precision Casting in the Bronze Age and Computer Reconstruction of the Casts
Garbacz-Klempka A., Kozana J., Piekoś M., Kwak Z., Długosz P., Stolarczyk T.
Archives of Foundry Engineering
|
2015
|
Vol. 15, iss. 1 spec.
21--26
EN
The casting workshop in Grzybiany, in Lower Silesia (SW Poland) is a valuable source of knowledge on the development of casting techniques in the 7 – 6 centuries BC. Abundant evidence found on the archaeological site points to cast manufacturing by means of precision casting in ceramic moulds (lost-wax molding). The workshop is the biggest collection of moulds for bracelet, necklace and other smaller decorative artefacts in Poland. The aim of the work is to conduct the research of the moulds and casts with the view of performing a computer reconstruction of the casting moulds from the Bronze and Early Iron Age, based on the Grzybiany finds. As part of the work, both the microscopic structure and defectoscopic analyses of the casting moulds were performed. Chemical composition of the casts was tested using the X-ray fluorescence spectroscopy method. Based on these results and using computer modelling methods, a geometric visualisation was performed, which is the bases for preparing the visualisation of the process of pouring liquid metal into the moulds, reconstructing both the technology and the alloys used.
5
Content available Analysis of Impact of the Multilayer Ceramic Moulds Quality on the Steel Precision Castings Dimensional Accuracy
Haratym R., Biernacki R., Kwapisz J.
Archives of Foundry Engineering
|
2015
|
Vol. 15, iss. 2 spec.
27--30
EN
Results of analysis presented in this paper were based on analysis of casts made especially for this research purpose and related to actual cast – industrial. The evaluation of the dimensional accuracy of casts was made in relation to the pressure of the liquid metal with consideration of the ceramic mould temperature. Ceramic moulds used in these analyses were made from crystalline quartz with an aqueous colloidal silica binder containing polymers (KK), and ethyl silicate (KE).
6
Content available The Quality of Steel Castings in Terms of Precision Ceramic Mould Structure
Biernacki R., Haratym R., Kwapisz J.
Archives of Foundry Engineering
|
2013
|
Vol. 13, iss. 1 spec.
9--12
EN
In the opinion of metrologists, technologists and trybologists surface microgeometry is one of the most important factors affecting the performance characteristics of the machine parts (resistance to wear, sliding and lubricating properties, durability and tightness of joints, fatigue strength, corrosion resistance, etc.). The analysis was made of the ceramic mould elements structure influence on the microgeometry of steel castings surface and their dimensional accuracy. To assess the structure of the ceramic mould previous studies made with usage of computer tomography where used, those studies highlight the ceramic mould structure anisotropy and its properties.
7
Content available Non-ferrous Metals Precision Casting Shape Accuracy in Terms of Ceramic Moulds Anisotropic Material Properties
Biernacki R., Haratym R., Kwapisz J.
Archives of Foundry Engineering
|
2013
|
Vol. 13, iss. 1 spec.
5--8
EN
Shape accuracy analysis of aluminum alloy castings was made in function of ceramic mould properties. Taken it to account was anisotropy of those properties, including influence of ceramic mould properties on the porosity of castings. Ceramic moulds strains, which occur in sintering phase, were evaluated with taking into account the design and production process.
8
Content available Evaluation criteria of wax pattern strength tests and their role in forecasting the shape accuracy of wax patterns
Haratym R., Biernacki R., Lewiński J., Kwapisz J.
Archives of Foundry Engineering
|
2013
|
Vol. 13, iss. 4
49--52
EN
This research paper will present and analyze selected testing of wax patterns - bending strength test, test of resistance to creep and penetration hardness test. Evaluation of these tests will be carried out in terms of the shape accuracy of wax patterns. Additionally, statistical evaluation will be carried out of relationships between selected parameters of previously mentioned tests. Standard bending tests will be statistically evaluated and compared with two other test methods conducted on corresponding patterns. Particular attention will be given to creep resistance, which is a very useful test method for assessing changes in the shape of complex patterns in the function of time and temperature. At the same time an evaluation of hardness tests of wax patterns will be carried out with usage of appropriate samples or by direct examination of the production patterns.
9
Content available Temperature and microstructure characteristics of silumin casting AlSi9 made with investment casting method
Pietrowski S., Rapiejko C.
Archives of Foundry Engineering
|
2011
|
Vol. 11, iss. 3 spec.
177--186
EN
This work presents the research result of the temperature distribution and the microstructure in certain parts of the field-glass body frame casting made from silumin AlSi9 using the investment casting method in the ceramic mould. It was proved that the highest temperature of the silumin appears in the sprue in which the silumin is in the liquid-solid state, though the process of silumin crystallization in the casting is finished. It was stated that in certain elements of the casting the side opposite to the runner crystallizes and cools fastest. The differences in the rate of crystalline growth and cooling of certain casting elements cause different microstructure in them which can also influence the mechanic properties. It is necessary to state that the temperature of the initial heating of the ceramic mold equal to 60ºC guarantees obtaining of the castings without defects and of little porosity. Incomplete modification of the silumin with strontium causes silica precipitation to appear close to the spherical ones.
10
Content available Impact of analysis method on evaluation of ceramic mould surface microgeometry in the lost wax process
Matysiak H., Haratym R., Kwapisz J., Kłębczyk M.
Archives of Foundry Engineering
|
2011
|
Vol. 11, iss. 3 spec.
131--134
EN
In this article two methods of ceramic mould surface microgeometry analysis were presented. First was a contact method, in which Profilometer S3P produced by Perthen Mahr was used. In second optical method optical profiler Veeco NT 9300 was used for surface microgeometry analysis. Evaluation of the results gathered with those methods was made. It was found that optical analysis method of surface microgeometry give better research possibilities (it’s more optimal).
11
Content available remote Quality assessment of expendable patterns in the investment casting process
Matysiak H., Haratym R., Kurzydlowski K. J., Biernacki R.
Archives of Foundry Engineering
|
2010
|
Vol. 10, iss. 1 spec.
247--250
EN
The article presents the basic attempts at expendable patterns quality assessment, such as hardness test, creeping resistance tests and the assessment of patterns mixtures contraction as a function of solidification module. These features were verified on step-shaped pat-terns. Patterns mixtures made on the basis of hard waxes were selected for tests and compared with the domestic mixture based on paraffin and stearin (PS) as well as with the PS-mixture to which the material of used patterns from the WSK Rzeszow factory was added. The selected tests enable a quick assessment of whether the pattern mixture quality meets the requirements of optimum size accuracy and good quality of casting surfaces.
12
Content available remote Permeability of mould made by lost wax casting process
Sarek D., Trytek A., Nawrocki J.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 1
203-206
EN
Paper present results of permeability of moulds which have been made by lost casting wax process. Measurement and tests have been made using typical sand cast permeability tester. Measurement technique required preparing of special shape samples. All scope of tests have been realized in WSK 'PZL-Rzeszów' S.A. Results showing permeability of ceramic moulds in function of quantity layers.
13
Content available remote Reengineering systemu produkcji odlewów precyzyjnych
Władysiak R.
Archiwum Odlewnictwa
|
2006
|
R. 6, nr 19
413-424
PL
W pracy przedstawiono wyniki badań procesu produkcyjnego odlewów precyzyjnych metodą wytapianych modeli woskowych oraz projekt zmian w systemie produkcyjnym potwierdzonych filozofią nowoczesnego wytwarzania Lean Manufacturing. Pokazano schemat rozmieszczenia stanowisk oraz przebieg procesu wytwórczego. Wykazano możliwość zastosowania jednocześnie z metodyką LM komputerowego systemu ERP w produkcji odlewów precyzyjnych.
EN
The results of investigation of investment casting production system are presented in this paper. The changes of production system are owing to Lean Manufacturing philosophy. It's shawn the layout chart of work centers of manufacturing process. It's presented that there are the possibilities of precision casting production with both items implemented simultaneously: Lean Manufacturing methodology and Enterprise Resource Planning computer system.
14
Content available remote Accuracy of investment castings
Horáček M.
Archiwum Odlewnictwa
|
2005
|
R. 5, nr 15
121--137
EN
In the paper the analysis of wax pattern and casting dimensions changes during each stages of investment casting technology process has been presented. Results of wax patterns and castings of test plate free and restrained contractions dimensions changes research carried out in Department of Foundry Engineering at Brno University of Technology have been presented as well. Moreover obtained results were compared with results of casing “industrial” casting dimension changes research.
PL
W artykule przedstawiono analizę zmian wymiarowych modelu woskowego i odlewu w poszczególnych etapach procesu odlewnia metodą traconego wosku. Przedstawiono także wyniki badań zmian wymiarowych odlewów płyty testowej ze skurczem swobodnym i hamowanym przeprowadzonych Katedrze Odlewnictwa Politechniki w Brnie, które skonfrontowano z badaniami przeprowadzonymi na przemysłowym odlewie obudowy.
15
Content available remote Ocena krystalizacji staliwa metodą ATD
Pietrowski S., Władysiak R., Meksa W., Woźnicki G.
Archiwum Odlewnictwa
|
2003
|
R. 3, nr 8
293--300
PL
W pracy przedstawiono możliwości kontroli staliwa niestopowego i wysokostopowego metodą analizy termicznej i derywacyjnej (ATD). Wykonuje się z niego wysokojakościowe odlewy metodą traconych modeli z zastosowaniem rdzeni mocznikowych.
EN
This paper presents the capabilities of control with thermal and derivative analysis (TDA) method of cast carbon steel and alloy cast steel. These alloys are applied to product the high-quality casts with use of the carbamide cores and lost-wax process.
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