10.14489/td.2018.01.pp.040-045

2018, 01 January

DOI: 10.14489/td.2018.01.pp.040-045

Mamotko A. I., Maslov A. R.
DIAGNOSIS THE PROCESS OF DRILLING PARTS FROM LAYERED POLYMER COMPOSITE
(pp. 40-45)

Abstract. The problem of improving the performance of drilling in back parts of the modern designs of blades leading and steering propellers of helicopters from high-layered polymer composites reinforced by winding from titanium foil. The challenge lies in the fact that when drilling holes in the blades of composites formed characteristic defects – bundle package reinforce that reduces the structural strength of the blade. By examining the pattern of vibroacoustic signals from the cutting zone, the mean square values of the signal amplitudes and the octave spectrum diagrams in time intervals corresponding to the specific drilling mode for the drill inlet, the middle of the reinforcement pack, and the exit of the drill are obtained in conjunction with the dimensional characteristics of the resulting defects. It has been established that the bundle package gain accelerated with the approach since the drills from the winding layers because lower layers have the lowest bending strength. To increase the rigidity of the composite layers, specially prepared fillers were introduced into the free space of the preforms. It is established that the presence of fillers filling the cavities of the billet with uniform adherence to the walls stabilizes the drilling process of the blades, reduces the intensity and amplitude of the vibrations The dependences of the bundle of the enhancement packet on the feed are obtained, which showed that it greatly influences the values of the defects of the treated holes.The method of filling the free space of the keel part of the blade is proposed to reduce the level of vibrations gave a positive effect in the form of absence of delaminations and a decrease in the level of vibrations, which allows us to recommend it for drilling with feeds three times more than currently used.

Keywords: VA-signal, diagnosis, layered polymer composite, titanium foil, glasscarbonfiber prepreg, separation of layers.

+ - About the Authors Click to collapse

A. I. Mamotko, A. R. Maslov (MSTU “STANKIN”, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

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