SIMULATION AND EXPERIMENTAL TESTING OF MACHINE TOOL ACTIVE FEED DRIVE

摘要

Dynamic behaviour of a common machine tool design with fixed-mounted linear feed drives is characterized by disturbances caused by motion axes operation. It excites vibration which deteriorates machined surface quality and machining productivity as well. Those aspects represent important factors when evaluating the machine tool quality.rnThere are several possibilities of how to suppress the vibration. It is possible to absorb the vibration by means of a dynamic vibroabsorber or to improve damping of the whole machine structure. However, vibroisolation of the motion axis from the rest of machine tool represents a more efficient method. New concept of the vibroisolation technique based on active mounting of the feed drive motor is presented in this paper, whereby application of an active element with enough large stroke acting between the motor and machine frame is considered. Employing this approach, natural frequencies of the machine tool are not excited and consequently machine tool frame is isolated from forced vibration.rnThe paper shows simulation results of the active vibroisolation method using a mathematical model of a test bed and a real machine tool. Experimental investigation of the method on a real testing bed has been performed as well.