Research of vibration resistance of non-rigid shafts turning with various technological set-ups

Abstract

Abstract.The article considers the definition of the stability range of a dynamic system for turning nonrigid shafts with different technological set-ups: standard and developed ones; they are improved as a result of this research. The topicality of the study is due to the fact that processing such parts is associated with significant difficulties caused by deformation of the workpiece under the cutting force as well as occurrence of vibration of the part during processing, they are so intense and in practice they force to significantly reduce the cutting regime, recur to multiple-pass operation, lead to premature deterioration of the cutter, as a result, reduce the productivity of machining shafts on metal-cutting machines. In this connection, the purpose of the present research is to determine the boundaries of the stability regions with intensive turning of non-rigid shafts. In the article the basic theoretical principles of construction of a mathematical system focused on the process of non-free cutting of a dynamic machine are justified. By means of the developed mathematical model interrelations are established and legitimacies of influence of various technological set-ups on stability of the dynamic system of the machine-tool-device-tool-blank are revealed. The conducted researches allow to more objectively represent difficult processes that occur in a closed dynamic system of a machine.

Method for constructing an equivalent mechanical model of an elastic system of a machine with various technological equipment

“…Through the developed mechanical model the authors of the article investigated the boundaries of the stability regions for various types of technological equipment and revealed the patterns of the influence of various technological adjustments on the stability of the dynamic system of machine tools [14,15], which, on the basis of the analysis, will make important practical recommendations.…”

Automatic Stabilization Systems of Non-Rigid Shafts in Turning Work

“…The residual deformation of non-rigid shafts is connected with breakdown (during the mechanical processing) in the blank balancing tension; after the processing residual deformation appears with great time lag. The lack of the loss of the non-rigid shafts precision (while processing) multiplies examinations limits, merely the chance of the increase of the operating precision after mechanical [1][2][3][4][5][6][7][8][9][10][11] and thermomechanical [12][13][14] processing.…”