Розробка режимів видалення 3D-друкованих полімерних моделей з керамічних ливарних форм
The use of additive technologies, particularly 3D printing, to make patterns instead of traditional wax patterns is promising for casting into ceramic molds. However, when using polymer patterns, there is a problem of cracking ceramic shells during their firing. The goal of the work was to develop o...
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| Datum: | 2024 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | Ukrainisch |
| Veröffentlicht: |
Physico-technological Institute of Metals and Alloys
2024
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| Online Zugang: | https://www.metalsandcasting.com/index.php/mcu/article/view/233 |
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| Назва журналу: | Metal and Casting of Ukraine |
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Metal and Casting of Ukraine| Zusammenfassung: | The use of additive technologies, particularly 3D printing, to make patterns instead of traditional wax patterns is promising for casting into ceramic molds. However, when using polymer patterns, there is a problem of cracking ceramic shells during their firing. The goal of the work was to develop optimal thermo-kinetic modes of removal of disposable plastic patterns from ceramic molds, which will prevent the formation of cracks in ceramics. During the study, samples of patterns made by 3D printing from various plastics were selected and examined. Laboratory tests were carried out on a batch of ceramic shells made of electrocorundum. The methods of removing plastic patterns from ceramic molds by means of two-stage firing in thermal furnaces were investigated. The low-temperature stage of firing consisted in gradually heating the ceramics up to 350 °C. During it, the material of the patterns was compacted, softened, melted, and partially gasified. This reduced uncontrolled gas pressure and stress in the ceramic and prevented the formation of cracks in it. The high-temperature firing phase (1000—1100 °С) was performed for sintering ceramics and removing the remains of plastic materials. The influence of different plastic materials on the quality of the casting mold was investigated. It is proposed to use PLA plastic for the 3D printing of patterns, as it meets the requirements of environmental friendliness and cost. The possibility of improving the surface quality of ceramic shells by coating them with a thin layer of wax-like material is also considered. According to the results of research on the surface of ceramic forms, it is proposed to add structural elements to plastic patterns that reduce deformations of ceramic forms during firing. The developed firing modes of the patterns are used in the production of ceramic molds for endoprostheses. |
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