Research of the Vibration Level and Surface Quality at High-Speed Moulding

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UDС

674.023

DOI:

10.17238/issn0536-1036.2015.6.96

Abstract

Surface quality at moulding is determined by a number of factors: cutting conditions, constructive and geometrical adjectives of a tool, processed wood property. It is known that with an increase of cutting speed up to a certain limit there is an increase of surface quality. However, to achieve high-speed cutting it is required to increase spindle speed up to more
than 10000 rpm at the end mill processing that entails a significant increase in the vibration level. The article deals with the experimental investigation of the dependence of vibration level of a tool and surface roughness on the cutting conditions, the number of cutter teeth, timber species and feed direction with respect to the fibers. The study was conducted in the modern work center with CNC and according to the plan of fractional factorial experiment of the 25-1 type for two timber species of pine and oak. The piezoelectric sensor fixed on a
workpiece was used as measuring equipment. The sensor was connected through a preamplifier to the analyzer. A sensor signal was taped during the cutting process. The records demonstrated the spectrum of oscillations and the total level of vibration acceleration. The profilometer was used to measure the roughness. A resonant frequencies measurement of the
tool was performed. On the basis of the experimental data the regression equations were
obtained. The analysis of the equations of regression showed that with increase of spindle speed and the cutting depth the vibration level increased for both timber species. The vibration level at processing of oak decreased with increase in the number of cutter teeth. The surface roughness at processing of oak deteriorated with increasing the number of cutter teeth and bite per tooth and improved in the transition from along-the-grain feeding to the cross-grain feeding. The analysis of vibrational spectra showed that the spectrum was dominated by harmonics of spindle rotation frequency and frequency of teeth incision.

Authors

S.A. Cherepanov, Postgraduate Student D.A. Luzhanskiy, Postgraduate Student G.F. Prokof'ev, Doctor of Engineering Sciences

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya
Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; е-mail: serg-edu@yandex.ru; arov-dm@mail.ru

Keywords

moulding, vibration, surface roughness, resonant frequency, vibrational spectra, end mill.

References

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