DEFINITION OF DYNAMIC CHARACTERISTICS GRINDING OF CYLINDRICAL AND NEEDLE ROLLER SURFACE OF A TEXTILE MACHINE
Authors:   Chernihiv National University of Technology, Sira Natalia , Kolohoida Antonina ,   Chernihiv National University of Technology, Lytvyn Oleksandr ,   Chernihiv National University of Technology, Kalchenko Dmytro ,   Chernihiv National University of Technology
Published: January 2021

Urgency of the research. In the process of fabricating fabrics, various types of aggregates are used in the textile industry, such as crocheting, crocheting and others. Their working part is the drums and rollers covered with card headset. The quality of the work surface of the card headset is subject to high requirements, since the occurrence of an error in the craft drum or roller of the textile unit causes the formation of an uneven gap between the working elements and, accordingly, the release of the poor-quality product. And not a satisfactory condition of the working surface of the needles causes a gap in the material, which also increases the percentage of the gap. Target setting. Given the large dimensions of the drums and rollers of textile machines, as well as the slight stiffness of the headset, the dynamic impact on the accuracy of the processing has a significant impact. Actual scientific researches and issues analysis. Various aspects of the theory of fluctuations of rigid structures are investigated, which allows us to use an analytical approach to many practical cases. The main issues of the dynamics of metal-cutting machine tools are considered: equivalent and elastic systems, working processes, stability of the dynamic system, stationary and transitional processes. The data on the closed dynamical system of the machine, the indicators of dynamic quality are given. The methods of finishing a grinding of smooth cylindrical and sharpening of needle surfaces of drums and rollers of textile machines are offered. Uninvestigated parts of general matters defining. However, the study of dynamic characteristics in the process of finishing grinding cylindrical and needle surfaces of drums and rollers of textile machines was not conducted. Research of dynamic characteristics of the grinding process of cylindrical and needle surfaces of drums and rollers of textile machines, and determination of dynamic properties of elements of the processing system. The statement of basic materials. The value of the initial deflection of the needles as a result of their impact on the surface of the grinding wheel at the time of entry into the processing zone was determined. A spatial model of the needle was constructed and its frequency analysis in the Solidworks system was performed. Since the processing of textile rollers is proposed to be carried out on the grinding machine VZ-208F3, a modal analysis of its spindle assembly was also carried out. In the experimental study, the amplitude-phase-frequency characteristic is constructed. Conclusions. Through the computer spatial modeling, the first five self-oscillation frequencies were determined, as well as the corresponding oscillation patterns for the needle of the card headset and for the spindle knot of the machine VZ- 208F3. Experimental way is the amplitude-phase-frequency characteristic of the spindle.