Особливості конструювання моделей для їх 3D-друкування і наступної газифікації в ливарній формі

• Datum: 2023
• 1. Verfasser: Дорошенко, Володимир
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Physico-technological Institute of Metals and Alloys 2023
• Schlagworte: лиття за моделями; що газифікуються; 3D-друк; адитивне виробництво; разові моделі; нейтралізація газів; газопроникність; порівняння технологій
• Online Zugang: https://www.metalsandcasting.com/index.php/mcu/article/view/17
• Назва журналу: Metal and Casting of Ukraine

Methods of optimization and casting of gasified patterns (Lost Foam Casting Process, LFCP) have been studied, with the development of methods for the application of 3D printed patterns for LFCP. The hollow shell printed polymer patterns are designed by designers in an effort to bring them closer in weight to expanded polystyrene (EPS) patterns in such a way that their cores are printed as thin spacers, which prevent deformation of the pattern walls and ensure gas permeability for neutralization of gases by combustion. Taking excess gases out of shape for patterns with as much specific weight as possible than EPSs paves the way for preventing the negative effects that these gases can cause during casting. The peculiarity is that it is desirable to print the supports for printing shells so that they can be used as spacers between the shell walls of the pattern, or spacers to make inserts of simple geometric shape with EPS. The walls of the pattern, which have no cavity, should be printed with exhaust ducts or perform in them directed porosity of the pattern from the bottom up (when the pattern is in the mold) with the resulting output of gases through the vapor with the igniter at its outlet. Examples of production of fired patterns with the use of additive technology and castings obtained from such patterns are given. Printed patterns have a high surface cleanliness and can be performed in complex configurations. It is often more profitable to print one pattern instead of several parts made by traditional technologies, from which an equivalent printed pattern design is assembled. The given schemes of the main operating cycles from the examples of making one-time patterns at the stage of technological preparation at the launch of new castings show advantages in the speed of obtaining the first castings on 3D printed patterns compared to patterns obtained in traditional equipment.