Dynamic characterization of machining systems

Abstract

International audienceIn the working space model of machining, an experimental procedure is implemented to determine the elastic behaviour of the machining system. In this paper, a dynamic characterization and vibration analysis has long been used for the detection and identification of the machine tool condition. The natural frequencies of the lathe machining system are required (Ernault HN400 - France) according to three different situations with no cutting process are acquired. The system modal analysis is used to identify the natural frequencies. These frequencies are then compared to the ones obtained on the spindle numerical model by Finite Element Method. This work is validated by experimental tests based on measures of the lathe machine tool frequencies domain. The main objective is to identify a procedure giving the natural frequencies values for the machine tool components, in order to establish a better condition in the cutting process of the machine tool

Experimental Investigation of Machine Tool Condition during Machining of Ferrous Components

“…This study revealed the variations in the cutting force and vibration of the cutting tool. Reference [5], MironZapciu, Jean-Yves K'nevez, Alain Gé rard, Olivier Cahuc and Claudiu F. Bisu, carried out an experiment to analyse the tool dynamic characterization in a lathe under different working conditions. The frequencies from the FFT spectrum and frequencies obtained from the finite element modal analysis were compared and a procedure was established for better performance of the machine tool.…”

Experimental Study of the Static Modal Analysis on Milling Machine Tool

“…In order to reduce chatter, many researches have done on chatter prediction. [8][9] with the aim of analysis of chatter phenomena, the tool's natural frequencies and the shape of their vibration modes were obtained from modal testing result. The introduction of the non-linear interaction between the tool and carries its part always gives interesting results which go from regular (periodic or quasiperiodic) vibrations to the possibilities of the chaotic ones or, always within the orthogonal framework of the cut, while utilizing in more the dry friction [10][11].…”

Grey Correlation Analysis-Based Comprehensive Dynamic Characteristics Evaluation of NC Machine Tool

“…Deep analysis of the dynamic characteristics of NC machine tools requires plentiful and reliable test data for support. In the aspects of NC machine tools' dynamic characteristics testing and evaluation, Theoretical analysis, experimental modal analysis and the comprehensive analysis method combined theoretical analysis with experiment are the important means of obtaining the structural dynamic characteristics of NC machine tools, these three methods can get the dynamic characteristics parameters of machine tools in different ways, find out the weak links of machine tools, improve machine tool's structure design, and increase the dynamic performance of machine tools [3][4][5][6][7][8][9][10][11][12]. However, because of (1) the complexity and uncertainty of the factors such as the stiffness and damping between NC machine parts' faying surfaces, transmission gap, friction, and cutting process system etc [13][14][15]; (2) When having modal analysis for NC machine tools , as the reasons that the harmonic excitation caused by machine tool's rotating parts and the interference signal produced by the surrounding environment are difficult to test and calculate [16] and other reasons, the accuracy of existing machine structural dynamics modeling and simulation methods analysis is poor, so far there is still no effective method using for the quantitative or qualitative evaluation of machine tools' dynamic characteristics.…”