Improving the accuracy and surface quality of additive manufacturing products

BACKGROUND: This scientific article is devoted to the issues of increasing the dimensional accuracy of products obtained through additive technologies. As a production method, printing with molten polymer thread through an extruder (FFF printing technology) is considered. The main problem in the production of products using this method is the lack of a systematic understanding in terms of the purpose of process modes that ensure the required accuracy and surface quality of the resulting products. This paper proposes an approach that makes it possible to develop technological recommendations for the purpose of printing modes that ensure the stable receipt of the required output process parameters. AIMS: this research consists in development of methodological approach to assignment of technological modes of printing with molten polymer thread, which provide stable provision of required parameters of dimensional accuracy and quality of surface layer of products. METHODS: As the main process equipment, printers have been used that print products using material feed through an extruder nozzle. The study of the directions for improving the accuracy and quality of the surface of products was carried out using the hierarchy analysis method, which allows evaluating options taking into account the degree of their significance. The study of the vibrations of the printer elements was carried out using an accelerometer sensor. The surface roughness of the products was measured on a profiler, and the dimensions were measured using a micrometer. RESULTS: As a result of the calculation of the comparison coefficients in the analysis of the directions of increase in dimensional accuracy and print quality of the molten polymer thread, it was found that the best combination of criteria has an option that is associated with the analysis and reduction of vibrations during printer operation. As a result of the analysis of vibrations that occur under various technological conditions, resonance conditions were revealed. An application firmware has been developed that allows you to configure the printer drive with the ability to eliminate resonances. As a result of studies of the accuracy and quality of the surface of products obtained on the basis of eliminating resonance phenomena and without it, it was found that the first option can significantly improve the output parameters of the process. As a prospect for further research, it is advisable to carry out a theoretical generalization of the results obtained in order to extend the proposed approach to printers of other designs, thereby making it more universal. CONCLUSION: Studies have shown that the use of a methodological approach, which consists in identifying and eliminating resonant phenomena, makes it possible to increase the dimensional accuracy and surface quality of products obtained using additive technologies. The material was prepared as part of the grant work. Grant Agreement No. 4808/NPC dated 12/19/2024