Influence of Resistant Forces on the Positioning Precision of Kinematic Feed Chains Used on CNC Machine Tools

Abstract:

Many researches from the international literature and also those of the specialised companies from the machine tools domain, have focused in the past years on increasing the positioning precision and implicitly, the manufacturing precision of the numerically controlled machine tools. The results of these efforts have led to the elimination or compensation of different factors which affect the positioning precision of the kinematic feed chains. Nevertheless, the effects of some factors still find themselves in the positioning error of the kinematic feed chains, an important component of this error being represented by the cutting and friction force induced error (resistant errors). This paper presents a new method of experimental analysis for establishing the influence of resistant forces on the positioning precision of the kinematic feed axis. Due to the fact that measuring the positioning precision during the cutting process is difficult to achieve, the experiments were carried out using a simulated force. In order to simulate an axial force, a hydraulic system was adopted, composed of a hydraulic cylinder, a distributor valve and a check valve.

• Periodical: Applied Mechanics and Materials (Volume 657)
• Pages: 495-499
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.657.495
• Online since: October 2014
• Authors: Marian Funaru*, Gheorghe Stan
• Keywords: Backlash, Dead Zone, Kinematic Feed Chain, Positioning Precision, Resistance Forces

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