Chatter Suppression in Parallel Turning Assisted with Tool Swing Motion Provided by Feed System

Parallel turning technology has been attracting attention as an important technology to enhance the productivity of multitasking machine tools. To maximize the productivity advantage of parallel turning, chatter avoidance or suppression is one of the most noteworthy concerns. In this study, a novel chatter suppression technique using tool swing motion is provided by a feed drive system. The optimal design methodology of the tool swing motion for effective chatter suppression is also introduced based on its analogy with the spindle speed variation technique under the shared-surface parallel turning and rigid-tool and flexible-workpiece assumptions. The proposed method was evaluated with regard to the chatter stabilizing performance and workpiece runout as compared to conventional equal pitch turning and unequal pitch turning for chatter suppression. As a result, the proposed tool swing parallel turning exhibited a high chatter stabilizing performance without eccentricity of the workpiece and enhanced surface quality, although particular swing marks were left on the machined surface.

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DESIGN OF A FAST SERVO MULTI-ELEMENT FEED DRIVE

Proceedings of the Canadian Engineering Education Association (CEEA) ◽

10.24908/pceea.v0i0.4049 ◽

2011 ◽

Author(s):

A. T. Elfizy ◽

M. A. Elbestawi

Keyword(s):

High Resolution ◽

Data Storage ◽

High Precision ◽

Experimental Testing ◽

Drive System ◽

Precision Positioning ◽

Chatter Suppression ◽

Feed Drive ◽

In Series ◽

Feed Drive System

High precision positioning has become one of the most important features of a precision machine. Such a machine is required to provide versatility, speed and workspace and high precision positioning. Combining coarse (large stroke) and fine (high resolution) drive elements, connected in series, in a multi-element feed drive system provides the capacity of a large workspace with the property of high resolution motion. The performance of the whole system may be improved by adopting the merits of both drive elements to work in a complementary fashion. The multi-element feed drive concept has several applications in manufacturing, robotics and data storage. Fast tool servo in manufacturing is a direct use of the concept and its applications range from the creation of asymmetric surfaces to online chatter suppression. Micro-macro robots are also examples of multi-element feed drive systems that provide advantages when both large work space and accurate end-effector positioning are required. This paper presents an innovative design of a multi-element feed drive system for machine tools. It studies the design methodology and the implementation of the system and investigates several considerations that govern the design process and determine the performance. A multi-element feed drive setup based on a combination of PA and LM was built for experimental testing. Results show that the multi-element feed drive is able to improve the tracking performance as well as the steady state error. It also achieves faster settling time.

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An Electromechanical Co-Simulation Model Based on Lumped Parameter Model of Ball Screw Feed Drive System

MATEC Web of Conferences ◽

10.1051/matecconf/201823703007 ◽

2018 ◽

Vol 237 ◽

pp. 03007

Author(s):

Liang Luo ◽

Weimin Zhang ◽

Haonan Sui ◽

Jürgen Fleischer

Keyword(s):

Simulation Model ◽

High Speed ◽

Drive System ◽

Lumped Parameter Model ◽

Ball Screw ◽

Feed System ◽

Feed Drive ◽

Lumped Parameter ◽

Feed Drive System ◽

Screw Feed

The continuous search for efficiency put forward higher requests to the machine tool for high speed and high acceleration, which makes the large-size and lightweight-designed feed drive system more likely to produce vibration during high-speed and high-acceleration feed operation. Ball screw feed system is the most widely used linear drive system in the field of industrial automation. Electromechanical Co-Simulation for ball screw feed drive dynamics is an important technique for solving vibration problems occurs in the feed motion. In view of the shortcomings of the current dynamic simulation model in the study of vibration of ball screw feed drive system, taking a ball screw feed drive system test bench as an example, an electromechanical co-simulation model based on the lumped parameter model of ball screw feed drive system was built up in this paper. Firstly, based on the axial and rotation vibration integrated dynamic modeling method of ball screws, the lumped parameter model of ball screw feed system was established. Secondly, through the integration of the simulation model of semi-closed-loop cascade control system and the lumped parameter model of ball screw feed drive system, an electromechanical co-simulation model was built up. Simulation result shows that, the co-simulation model of ball screw feed drive system can predict the vibration occurs in the feed operation caused by the servo controller, ball screw feed system or the coupling between them.

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