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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.
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69--76
Opis fizyczny
Bibliogr. 16 poz., rys., tab., wykr.
Twórcy
autor
- Faculty of Manufacturing Technologies of the Technical University of Košice with the seat in Prešov, Slovak Republic
autor
- Institute of Technology and Business in České Budějovice, Czech Republic
autor
- The Faculty of Mechanics and Technology in Stalowa Wola, Poland
autor
- Institute of Technology and Business in České Budějovice, Czech Republic
autor
- Institute of Technology and Business in České Budějovice, Czech Republic
Bibliografia
- [1] ČSN 04 6509. Pressure die-casting. Terminology (Tlakovélití: Názvosloví). Praha: Český normalizační institut, 1978. 71 p.
- [2] ČSN 42 1431. Pressure die castings. Technical conditions (Odlitky tlakové: Technické podmínky). Praha: Český normalizační institut, 1982. 57 p.
- [3] Ružbarský, J., Paško, J. & Gašpár, Š. (2014) Techniques of Die casting. Lüdenscheid: RAM-Verlag. ISBN: 978-3-942303-29-3.
- [4] Gaspar, S. & Pasko, J. (2016). Technological Aspects of Returnable Material Introducing within Die Casting Technology. Tem Journal-Technology Education Management Informatics. 5(4), 441-445. DOI:10.18421/TEM54-05.
- [5] Majerník, J., Podařil, M., Socha, L., Gryc, K. (2019). Implementation aspects of the remelting material in the production of high pressure die casts on the aluminum based alloys. In 28th International Conference on Metallurgy and Materials, 22-24 May 2019 (pp. 1652-1657). Brno, Czech Republic: TANGER Ltd.
- [6] Paško, J. & Gašpár, Š. (2014). Technological factors of die casting. Lüdenscheid: RAM-Verlag. ISBN: 978-3-942303-25-5.
- [7] Capuzzi, S. & Timelli, G. (2018). Preparation and melting of scrap in aluminum recycling: A review. Metals. 8(4), 249. DOI: 10.3390/met8040249.
- [8] Mwema F.M. et al. (2019). Wear characteristics of recycled cast Al-6Si-3Cu alloys. Tribology in Industry. 41(4), 613-621. DOI: 10.24874/ti.2019.41.04.13.
- [9] Lazaro-Nebreda J., Patel, J.B., Chang, I.T.H., Stone, I.C., Fan Z. (2019). Solidification processing of scrap Al-alloys containing high levels of Fe. In Joint 5th International Conference on Advances in Solidification Processes, ICASP 2019 and 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining, CSSCR 2019, 17-21 June 2019 (Article number 012059). Salzburg: Institute of Physics Publishing. DOI: 10.1088/1757-899X/529/1/012059.
- [10] Noga, P., Tuz, L., Żaba, K., & Zwoliński, A. (2021). Analysis of microstructure and mechanical properties of alsi11 after chip recycling, co-extrusion, and arc welding. Materials. 14(11), 3124. DOI: 10.3390/ma14113124.
- [11] Bolibruchová, D. & Matejka, M. (2018). Analysis of microstructure changes for AlSi9Cu3 Alloy caused by remelting. Manufacturing Technology. 18(6), 883-888. DOI:10.21062/ujep/195.2018/a/1213-2489/mt/18/6/883.
- [12] Bjurenstedt, A., Seifeddine, S. & Jarfors, A.E.W. (2016). The effects of Fe-particles on the tensile properties of Al-Si-Cu alloys. Metals. 6(12), 314. DOI: 10.3390/met6120314.
- [13] Fu, J., Yang, D. & Wang, K. (2018). Correlation between the liquid fraction, microstructure and tensile behaviors of 7075 aluminum alloy processed by recrystallization and partial remelting (RAP). Metals. 8(7), 508. DOI:10.3390/met8070508.
- [14] Krolo, J., Lela, B., Ljumović, P. & Bagavac, P. (2019). Enhanced mechanical properties of aluminium alloy EN AW 6082 recycled without remelting. Technicki Vjesnik. 26(5), 1253-1259. DOI: 10.17559/TV-20180212160950.
- [15] Wang, K. at al. (2018). Characterization of microstructures and tensile properties of recycled Al-Si-Cu-Fe-Mn alloys with individual and combined addition of titanium and cerium. Scanning. 2018, 3472743. DOI: 10.1155/2018/3472743.
- [16] Matejka, M., Bolibruchová, D. & Kuriš, M. (2021). Crystallization of the structural components of multiple remelted AlSi9Cu3 alloy. Archives of Foundry Engineering. 21(2), 41-45. DOI: 10.24425/afe.2021.136096.
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Bibliografia
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bwmeta1.element.baztech-41d31bf8-0d0f-4892-bb4e-cea1503655fe