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PARAMETRICAL PHENOMENA UNDER ON-MACHINE PROCESS CONTROL

Abstract

The problem on the stationary tool trajectories instability relative to the workpiece taking into account the periodic parameter variation of the interacting subsystems and of the dynamic coupling formed under cutting is considered. Parameter changes are caused by cyclic variations of the workpiece stiffness in the direction normal to the rotative axis, as well as variations of the allowance for machining periodic with the period of its rotation. It is shown that the periodic parameter changes induce the instability mechanisms not analyzed before. Moreover, in this case the loss of stability is basically dependent on the spindle speed. In addition, the instability is also associated with the kinematic perturbations caused by the periodic component of the support longitudinal feed velocity. Some examples of instability depending on the mathematical model parameters of the cutting system are given.

About the Authors

Vilor Lavrentyevich Zakovorotniy
Don State Technical University.
Russian Federation


Pham Thu Huong
Don State Technical University.
Russian Federation


Pham Dinh Pham Dinh
Don State Technical University.
Russian Federation


References

1. Zakovorotniy, V.L., Flek, M.P., Pham Dinh Tung. Sinergeticheskaya kontseptsiya pri postroyenii sistem upravleniya tochnostyu izgotovleniya detaley slozhnoy geometricheskoy formy. [Synergetic concept in construction of accuracy control systems for manufacturing parts of complex geometric forms.] Vestnik of Don State Tech. University, 2011, vol. 11, no. 10, pp. 1785–1797 (in Russian).

2. Zakovorotniy, V.L., Nguyen Xuan Chiem, Pham Dinh Tung. Matematicheskoye modelirovaniye i parametricheskaya identifikatsiya dinamicheskikh svoystv podsistem instrumenta i zagotovki pri tochenii. [Mathematic simulation and parametric identification of tool and workpiece subsystems dynamic properties under cutting.] Izvestiya vuzov. Severo-Kavkazskiy region. Tekhnicheskiye nauki, 2011, no. 2, pp. 38–46 (in Russian).

3. Zakovorotniy, V.L., et al. Sinergeticheskiy sistemnyy sintez upravlyayemoy dinamiki metallorezhushchikh stankov s uchetom evolyutsii svyazey. [Synergetic system synthesis of manageable dynamics of cutting machines with account for communications evolution.] Rostov-on-Don: DSTU Publ. Centre, 2008, 324 p. (in Russian).

4. Push, A.V. Shpindelnyye uzly. Kachestvo i nadezhnost. [Spindle units. Quality and reliability.] Moscow: Mashinostroyeniye, 1992, 288 p. (in Russian).

5. Kedrov, S.S. Kolebaniya metallorezhushchikh stankov. [Cutting machine vibrations.] Moscow: Mashinostroyeniye, 1978, 199 p. (in Russian).


Review

For citations:


Zakovorotniy V.L., Huong P., Pham Dinh P. PARAMETRICAL PHENOMENA UNDER ON-MACHINE PROCESS CONTROL. Vestnik of Don State Technical University. 2012;12(7):52-61. (In Russ.)

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ISSN 2687-1653 (Online)