Abstract
This paper discusses an approach to enable step-wise velocity changes in machine tool feed drives while reducing the reaction force of the drive on structural machine components. The implementation is based on an additional actuator that transmits well-defined impulses on the table via mechanical impacts. Possible applications are seen in processes as beam processing or handling. The approach is introduced by means of a multi-body model and afterwards experimental results are shown. On the one hand, the reduction of the tracking error while following discontinuous velocity profiles is analyzed, on the other hand, the reduced excitation of the machine structure is shown. The experimental verification of the functional principle is performed on a single axis setup where the fundamental parameters in design, material and control are quantified. Concluding, a short outlook on remaining research topics regarding the shown approach is given.
Highlights
In machine tools, feed drives are used to produce a defined path of the tool relative to the workpiece, which is necessary for the particular process
To the knowledge of the authors, no such approach has been applied on feed drives yet, so this paper aims at giving basic answers on applicability and potential performance
The experimental results confirm an improved behaviour of the feed drive with impact actuator for profiles with discontinuous velocity profiles
Summary
In machine tools, feed drives are used to produce a defined path of the tool relative to the workpiece, which is necessary for the particular process. Today, mainly electromechanical servo drives are used for reasons of good control performance and energy efficiency. Those are designed either as direct drives or with a mechanical gear, such as a ball screw. Both concepts have specific advantages and disadvantages, but they have in common that their electrical and mechanical parameters are defining and limiting the dynamic behavior of the entire feed system. The design of feed drives has to consider technical as well as economic requirements of the intended area of application; over dimensioning of drive components is avoided especially for serial kinematics, as it decreases the payload of consecutive axes. The optimization of feed dynamics by means of design, control or actuatorbased approaches outlines potential for increased process quality and efficiency in production engineering
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