Методи поєднання вакуумно-плівкової формовки з литтям за друкованими моделями, що газифікуються

• Дата: 2023
• Автори: Дорошенко, В. C., Михнян, О. В., Калюжний, П. Б., Нейма, О. В.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2023
• Теми: вакуумно-плівкова формовка; друковані моделі; лиття за моделями; що газифікуються; 3D-друк; адитивне виробництво; ливарне виробництво; відходи ППС
• Онлайн доступ: https://plit-periodical.org.ua/index.php/plit/article/view/methods-combining-v-process-lost-foam-casting-process-gasified-p
• Назва журналу: Casting Processes

Physico-Techological institure of Metals and Alloys of NAS of Ukraine (Kyiv, Ukraine) УДК 621.74.045 The use of 3D printing technology or additive manufacturing (AM) is becoming more common in industrial production. The concept of the simplest and least expensive introduction of 3D printing in domestic foundry production, which is most easy and profitable to implement through the technology Lost Foam Casting (LFC) process, requires the creation of a number of subordinate technologies that will be prerequisites for such implementation. The study is devoted to the development of methods for rapid automated production of disposable polymer patterns with indicators close to traditional patterns of expanded polystyrene (EPS), using 3D printing on common simple printers. The appearance on the world market of light polymeric and foam-forming threads that foam at elevated temperatures and layers of traditional density form at lower printing temperatures is described. Examples of printed materials from foam materials are given. Such foam and lightweight materials for 3D printing, both threads and granules, are still in their infancy to be implemented for LFC. We have developed and patented a material for a single pattern and a method of printing it from shredded EPS waste in order to bring the performance of products from it, to such properties of used traditional patterns of EPS. The concept of molding according to the printed one-time pattern is proposed, which is “transformed” into a shell, and the foundry form becomes similar to the form in the V-process. The use of traditional for vapors allows the removal of excess gas through them during metal filling and gasification of the shell pattern in the event that the vacuum of the mold will not be enough to suck these gases into the sand of the mold. A method of using a “paired” 3D printer and a 3D milling machine for printing and removing “excess” printing has also been developed. Positioning and strong fixing in vacuum sand, as in the conductor, of products of difficult geometry is suitable for machining of any details from metal or plastic.   References 1. Daniel Temprado. Foam & Lightweight Filament – How and Why to 3D Print with It. Jun 9, 2022. URL: https://all3dp.com/1/foam-lightweight-filament-how-and-why-to-3d-print-w...2. Rishennya vid 17.01.2022 po zayavci u202105814 Ukrayina, MPK: МПК8 B22C 9/02, B22C 15/02, В29С47/78. Method of additive production of polystyrene foundry model or other three-dimensional object of complex configuration / O. J. Shinskij, V. S. Doroshenko, P. B. Kalyuzhnij, O. V. Mihnyan, O. V. Nejma. Zayavleno 18.10.2021. [in Ukrainian].3. J. O'Connell. 3D Printing Infill: The Basics – Simply Explained. 24.02.2022. URL: https://all3dp.com/2/infill-3d-printing-what-it-means-and-how-to-use-it/4. Doroshenko V. S., Kalyuzhnij P. B., Mihnyan O. V., Nejma O. V. (2022). Combination of vacuum-film molding with casting by gasified printed patterns. Novi materiali i tehnologiyi v mashinobuduvanni-2022. Materiali XIV mizhnar. nauk.-tehn. konf. (Kyiv, 28–29 april 2022). Kyiv, 2022. P. 48–51. [in Ukrainian].5. Boldyrev A. A. (2013). Development of technology for finishing parts based on rheological fluids: dis… PhD / Voronezhskij gos. tehn. universitet. Voronezh. 137 p. [In Russian].6. A. s. SSSR 1063528 А, MPK B22C 9/02. A method of manufacturing casting molds by vacuum molding. Publ. 30.12.1983, Bull. № 48. [in Russian].7. Doroshenko V. S. (2021). Neutralization of gases during metal casting by gasified patterns and prerequisites for the use of 3D printed patterns. Casting Processes. № 3. P. 32–43. [in Ukrainian].8. Doroshenko V. S. (2021). Neutralization of gases emitted during casting by gasified patterns. Metal i littya Ukrayini. № 2. P. 64–71. [in Ukrainian].9. Doroshenko V. S. (2021). 3D printed polymer pattern for gasification in the mold. Novi materiali i tehnologiyi v mashinobuduvanni-2021. Materiali XIII mizhnar. nauk.-tehn. konf. (Kyiv, 28-29 april 2021). Kyiv. P. 77. [in Ukrainian].