Temat: thin walled casting - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The control of solidification kinetics of the vacuum-cast thin-wall nickel-based superalloys by changing the geometrical characteristics of the ceramic mold
Autorzy:: Cygan, R.
Szeliga, D.
Rokicki, P.
Sieniawski, J.
Suchy, J. S.
Powiązania:: https://bibliotekanauki.pl/articles/381982.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nickel based superalloy
ceramic mold
thin walled casting
investment casting
nadstop niklu
forma ceramiczna
odlewanie cienkościenne
odlewanie precyzyjne
Opis:: This paper provides an analysis of experimental research and results of investment casting process. Temperature field in a ceramic mold is one of the problems during numerical simulation. Reducing the costs of production in precision casting involves the reduction of scraps, which is one of the fundamental problems of the foundry industry. Reducing these costs is associated with optimization of precision casting technology of aircraft engines critical parts, including control of the solidification front in thin-walled castings of nickel super alloys cast in a vacuum. It is achieved by changing the geometrical characteristics of the ceramic mold. The results of the tests were used to optimize the industrial production of aircraft components in Precision Foundry of WSK Rzeszów. Temperature distribution gained in the conducted tests allowed verification and optimization of computer simulations.
Źródło:: Archives of Foundry Engineering; 2013, 13, 4; 21-28
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effects of Process Related Variations on Defect Formation in Investment Cast Components
Autorzy:: Raza, M.
Silva, P.
Irwin, M.
Fagerström, B.
Jarfors, A. E. W.
Powiązania:: https://bibliotekanauki.pl/articles/380022.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: thin-walled castings
casting defects
process variations
foundry practice
investment casting
odlewy cienkościenne
wady odlewu
zmiany procesu
Opis:: Castability of thin-walled castings is sensitive to variation in casting parameters. The variation in casting parameters can lead to undesired casting conditions which result in defect formation. Variation in rejection rate due to casting defect from one batch to other is common problem in foundries and the cause of this variation usually remain unknown due to complexity of the process. In this work, variation in casting parameters resulting from human involvement in the process is investigated. Casting practices of different groups of casting operators were evaluated and resulting variations in casting parameters were discussed. The effect of these variations was evaluated by comparing the rejection statistics for each group. In order to minimize process variation, optimized casting practices were implemented by developing specific process instructions for the operators. The significance of variation in casting parameters in terms of their impact on foundry rejections was evaluated by comparing the number of rejected components before and after implementation of optimized casting practices. It was concluded that variation in casting parameters due to variation in casting practices of different groups has significant impact on casting quality. Variation in mould temperature, melt temperature and pouring rate due to variation in handling time and practice resulted in varying quality of component from one batch to other. By implementing the optimized casting instruction, both quality and process reliability were improved significantly.
Źródło:: Archives of Foundry Engineering; 2018, 18, 1; 103-108
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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