ISSN 0869-6632 (Print)
ISSN 2542-1905 (Online)

For citation:

Zakovorotny V. L., Gvindjiliya V. E. Bifurcations of attracting sets of deformation displacement of cutting tool depending on the spindle group beats. Izvestiya VUZ. Applied Nonlinear Dynamics, 2017, vol. 25, iss. 6, pp. 38-56. DOI: 10.18500/0869-6632-2017-25-6-38-56

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Language: 
Russian
Heading: 
Applied Problems of Nonlinear Oscillation and Wave Theory
Article type: 
Article
UDC: 
621.91:531.3
DOI: 
10.18500/0869-6632-2017-25-6-38-56

Bifurcations of attracting sets of deformation displacement of cutting tool depending on the spindle group beats

Autors: 
Zakovorotny Vilor Lavrentevich, Don State Technical University
Gvindjiliya V. E., Don State Technical University
Abstract: 

Subject of the study. The bifurcations of the attracting sets of the deformational displacement of the tool in the dynamic system of the turning machine depending on the beats periodic trajectory of the spindle group are considered in the article. The dynamic system is represented by the two interact mechanical subsystems through the dynamic link formed by the cutting process. Through the link is represented by the forces model in the coordinate condition, the trajectories of the executive elements and the trajectories of the spindle beats group. The model of this link is nonlinear. Therefore the system characteristics (stability of the trajectories and the forming attracting sets of the deformational displacement) depend on the parameters of the beats. In this system not only the conditions for the parametrical self-excitation are created but the different attracting sets of the deformation displacement (limit cycles, invariant tori, chaotic attractors) depending on the parameters of the beats are formed. Substantiation of address to studying of this question. The disturbances by the spindle group depending on the accuracy and condition of the machine cause formation of the various attracting sets of the deformational displacement of the tool during work-process of the detail. These deformational displacements change the shape-generating trajectories of the tool movement relative to the part which influence the geometric topology of the forming surface. The research intends to discover the influence of the dynamic of the cutting process in the unity of the parameters of the beats and the attracting sets with the geometric topology of the work surface of the detail determined its consistency with the specified technological requirements. Method of research. The characteristics of the attracting sets of the deformational displacement and the laws of its formation are studied on the basis of the digital simulation. Themathematical model of the perturbed system was proposed for this purpose. Novelty. In contrast to previously done researches the transformation of the attracting sets of the deformational displacement depending on the parameters of the beats are analyzed in the article. The mathematical model of the system is performed as perturbed, the forces are the sum of the forces acted on the front surface of the tool and forces formed in the contact area of the its back side plane. Results. The instance of the influence of the beats of the spindle group with the attracting sets of the deformational displacement of the system are presented, the bifurcations of the system depending on the parameters of the disturbance are also represented. Conclusions. The complicated transformation of the attracting sets takes place while parameters of the disturbance changes. Therefore it’s necessary to consider the effect of perturbations on attainable quality of the detail during controlling of the cutting process and in a process of CNC program creation.  

Key words: 
bifurcation
attracting sets
dynamic cutting system
beats of the spindle
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Received: 
11.08.2017
Accepted: 
28.10.2017
Published: 
31.12.2017
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