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EXPERIMENTAL ANALYSIS OF THE INFLUENCE OF BALLSCREW STIFFNESS ON THE POSITIONING PRECISION OF KINEMATIC FEED CHAINS USED ON CNC MACHINE TOOLS


MARIAN FUNARU 1, GHEORGHE STAN 1
1. “Vasile Alecsandri” University of Bacau, Calea Marasesti 157, Bacau, 600115, Romania

Issue:

JESR, Number 2, Volume XX

Section:

Issue Nr. 2 - Volume 20(2014)

Abstract:

Recent trends in the machine tools domain have focused on improving the manufacturing performances by increasing the feed rates and acceleration values. In this context, the stiffness of the constructive elements which form the mechanical part of the kinematic feed chains need to be studied in order to determine the machine tool dynamic behavior. This study plays a very important role in the correct dimensioning of the feed chain structure and in establishing an optimum control law for the closed-loop system. The present paper presents an experimental study which demonstrates the influence of the whole kinematic feed chain stiffness on the positioning precision of the moving table. Experimental tests were carried out on a test bed which uses the indirect position measuring system, in which case all the external disturbances affecting the mechanical part are found in the values of the positioning precision parameters.

Keywords:

kinematic feed chain, stiffness, ballscrew mechanism, positioning precision.

Code [ID]:

JESR201402V20S01A0004 [0004133]

Full paper:

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