New method to characterize a machining system: application in turning

Bisu, Claudiu-Florinel; K'Nevez, Jean-Yves; Darnis, Philippe; Laheurte, Raynald; Gérard, Alain

doi:10.1007/s12289-009-0395-y

Cited by 16 publications

(8 citation statements)

References 30 publications

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“…The stiffness matrix k is given in another work [7]. Accordingly numerical models were obtained the results for the first twelve natural frequencies of these two models (represented in the figure 13 and 14).…”

Section: Resultsmentioning

confidence: 99%

Dynamic characterization of machining systems

Zapciu

K'Nevez

Gérard

et al. 2011

Int J Adv Manuf Technol

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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

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Section: Resultsmentioning

confidence: 99%

Dynamic characterization of machining systems

Zapciu

K'Nevez

Gérard

et al. 2011

Int J Adv Manuf Technol

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“…Thus, under a load P = 1,000 N, for material having a Young modulus E = 21×10 5 N/mm 2 , the workpiece dimensions selected are: D 1 = 60 mm (diameter), L 1 = 180 mm (length), for a bending stiffness of 7×10 7 N/m ( Fig. 2) [15]. These values are within the higher limit of the stiffness zone acceptable for a conventional lathe [16], [17], [18].…”

Section: Experimental Devicementioning

confidence: 99%

Self-excited vibrations in turning: cutting moment analysis

Cahuc

K'Nevez

Gérard

et al. 2009

Int J Adv Manuf Technol

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This work aims at analysing the moment effects at the tool tip point and at the central axis, in the framework of a turning process. A testing device in turning, including a six-component dynamometer, is used to measure the complete torsor of the cutting actions in the case of self-excited vibrations. Many results are obtained regarding the mechanical actions torsor. A confrontation of the moment components at the tool tip and at the central axis is carried out. It clearly appears that analysing moments at the central axis avoids the disturbances induced by the transport of the moment of the mechanical actions resultant at the tool tip point. For instance, the order relation between the components of the forces is single. Furthermore, the order relation between the moments components expressed at the tool tip point is also unic and the same one. But at the central axis, two different order relations regarding moments are conceivable. A modification in the rolling moment localization in the (y, z) tool plan is associated to these two order relations. Thus, the moments components at the central axis are particularly sensitive at the disturbances of machining, here the self-excited vibrations.

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“…1 Usually, it is the fundamental mode (at low frequency) that predominates. 4 In practice, the jerk control method proves to be a suboptimal solution to vibration reduction.…”

Section: Introductionmentioning

confidence: 99%

The multimode frequency analysis and its effect on the position accuracy of the sorting arm during operation

Jiang

Mao

et al. 2017

Advances in Mechanical Engineering

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Inertial vibrations are one of the crucial problems in the chip sorting process. High acceleration excites the sorting machine structure up to high frequencies so that the multimode vibration appears. The multiple-input nature of operational excitation depends on the varying machine configurations and running accelerations. In this article, the strain gauges are used to study the dynamic behavior of a light-emitting diode chip sorting arm which runs in high speed with varying configurations. This analysis is done in three stages. In the first step, the structure dynamic characteristics are compared between the static and operation states. It points out that some high frequency may display different characteristics in the states. The second step aims to find the effects of different configurations on the sorting arm dynamic vibration during operation. In the last step, the sorting arm is sorted at different levels of running excitation, and the effects of the multimode vibration on chip accurate position are discussed. This study provides an approach to study the dynamic behavior of high-speed running structure within true boundary conditions and actual force and vibration levels.

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New method to characterize a machining system: application in turning

Cited by 16 publications

References 30 publications

Dynamic characterization of machining systems

Dynamic characterization of machining systems

Self-excited vibrations in turning: cutting moment analysis

The multimode frequency analysis and its effect on the position accuracy of the sorting arm during operation

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