EFFECT OF ORIENTATION OF PRINCIPAL AXISES OF STIFFNESS OF AN ELASTIC-SYSTEM OF THE TOOLHOLDER ON A STABILITY OF TURNING PROCESS

Authors

  • O. Shevchenko National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine
  • A. Zharov National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv,

DOI:

https://doi.org/10.20535/2305-9001.2013.67.37666

Keywords:

nonrigid toolholder, oriented axis’s of stiffness, turning, chatter stability

Abstract

Purpose. Research of dynamic quality coefficients of the cantilevered toolholders and definition of directions of heightening of the conditions of chatter stability at turning.

Design/methodology/approach. In a paper it is shown, that essential effect on a level of relative oscillations of the cutter and a workpiece at turning is related with an angle of rotation of principal axises of a stiffness of an elastic-system of the toolholder and selection of the proportions of stiffness of elements of system. Proposed the  theory, which defines conditions of raise of a chatter stability of machining by the nonrigid toolholders and consider a rule of orientation of the principal axises of stiffness of a toolholder in an elastic subsystem of cutter-saddle concerning to a cutting force direction.

Findings. As a result of mathematical simulation the complex mathematical model of the closed dynamic system of a lathe is developed. This model allows to evaluate influence of parameters of the nonrigid toolholders on accuracy of the form of machined surface.

Originality/value. It is shown, that the cutter-saddle elastic-system have the most chatter stability at machining if the angle of rotation of principal axises of a stiffness  of this system is equated to half of angle of a cutting force  direction. On the basis of the results of theoretical and experimental researches the recommendations for designing and a effective using of nonrigid toolholders at turning  are given

References

Kudinov V.A. Dinamika stankov (The dynamics of machines). Moscow: Mashinostroenie, 1967. 360p.

Orlikov M.L. Dinamika stankov (The dynamics of machines): Ucheb. posobie dlja vuzov. 2-e izd. pererab. i dop. Kiev: Vyshha shkola, 1989. 272 p.

Rіzcetrimach: Deklaracіjnij patent Ukraїni No. 43535: MPK V23V 25/00 Opub. 25.08.2009, Bjul. No.16. 3p.

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Published

2015-02-11

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