Про практику адитивного виробництва в ливарництві та засоби лабораторного відпрацювання піщаних формувальних чи стрижневих сумішей для цього

• Datum: 2023
• 1. Verfasser: Дорошенко, Володимир
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Physico-technological Institute of Metals and Alloys 2023
• Schlagworte: 3D-формовка; ливарна форма; адитивне виробництво; піщана суміш; формовка зразків; тверднення суміші; лабораторний метод
• Online Zugang: https://www.metalsandcasting.com/index.php/mcu/article/view/7
• Назва журналу: Metal and Casting of Ukraine

Examples of foundry production with the participation of additive manufacturing (AM, or synonym – 3D printing) of molds and rods without pattern-rod equipment are considered. Additive technologies make the process of topological optimization of structures the most efficient, allowing to produce structures (including sand for metal casting) of almost any geometric shape. AM of sand molds are realized on installations in which, in particular, according to the most common method "Binder Jetting" a layer of loose sand mixture is alternately poured, on the surface of which a binding component (SC) is injected from the print-heads according to a special program. Companies such as ExOne and Voxeljet produce this equipment. From the periodicals about AB the information on experience of introduction of 3D printing of sand molds in the KAMAZ Company on SMAX installation from ExOne for the purpose of motivation of researches for the further distribution of AM technology is analyzed. The method of laboratory research of sand mixtures from domestic materials for 3D molding and simple means of its application with the description of manufacturing of equipment by a technique of its use is offered. The method is characterized by low cost of funds in the manufacture of samples of different compositions of molding and core mixtures for AM and testing them on standard samples for existing molding laboratories without the use of capital-intensive AM units, which are not massproduced in Ukraine. Options for preheating the components to accelerate the curing of mixtures and molding of samples with differentiated strength are possible – by a strong facing layer for contact with metal and a filling layer of lower strength and greater gas permeability. By analogy with the significant distribution of dry mixtures, it is possible to develop a variety of dry molding mixtures, the kinetics of impregnation of which (for their subsequent hardening) will be determined by the thickness, particle size distribution of cyclically applied dry layers, as well as concentration and weight of active ingredients.