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The Structural Design and Analysis Research on Precision Compensation Unit of Piezoelectric Drive NC Milling

Author: QiShuang
Tutor: ZouQing；ZhaoHongWei
School: Jilin University
Course: Mechanical Engineering
Keywords: Ultra-precision machine Piezoelectric stack Flexible hinge ANSYS finite element analysis Orthogonal test
CLC: TG547
Type: Master's thesis
Year: 2011
Downloads: 63
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Abstract


The ultra-precision machine tool feed is the key to ensure processing quality and efficiency, in order to adapt to the development of ultra-precision machining technology, to meet the requirements of high efficiency ultra-precision machine tools, high-precision, ultra-precision machine ball screw with the piezoelectric compensation Z-axis of the unit together feed mode research on piezoelectric stack the flexible hinge heap mating structure design and simulation analysis provides reliable protection for the output of the piezoelectric drive unit force and displacement, the design ideas opened up a new machine in the vertical direction of the piezoelectric drive unit micro-feed design concept of the compensation mechanism. This thesis, completed the following aspects: (1) Overview of ultra-precision machining and ultra-precision machine tools, machine tool drive (including traditional stepper motor, rolling guide, hydrostatic guideway, linear motors, and new smart material components) the development of the history and current situation, systematically reviewed the the piezoelectric driven development process of its unique advantages, applied to drive the field to clarify the main content and significance of this paper. (2) describes the basic principle of the piezoelectric effect and lists the important characteristics of the piezoelectric stack indicators from the statics and dynamics of the two aspects of the the piezoelectric drive mechanical properties of the formula derivation for the the Next compliant mechanism design and simulation analysis laid a solid theoretical foundation. (3) demonstration program by the piezoelectric micro-feed drive, to finalize the structure of the overall framework of the ultra-precision machine tools, Selection of key components, the main drive unit for piezoelectric compensation structure design and processing requirements. (4) through simulation analysis to select a suitable flexible hinge type, drawn at right angles to the mechanical characteristics of flexible formula derivation. According to the design requirements of the machine tool flexible hinge structure design, and the use of ANSYS software flexible hinge stress, strain, the simulation output displacement and modal analysis, lay the foundation for the next step structural optimization. (5) The use of orthogonal experiment method to optimize the structure of the flexible hinge design model, in accordance with the required test indicators (ie, the maximum stress, maximum strain and the first natural frequency value) to set the level of a five-factor orthogonal table, 16 simulation results of range analysis, the optimal solution. (6) using ANSYS software static analysis and modal analysis, the optimal flexible structure again to verify that the optimal solution with an optimal effect on the mechanical properties and dynamic characteristics. By wire cutting the actual processing of flexible bodies using laser displacement sensor to detect the linearity of the piezoelectric drive unit, the minimum compensation amount and stability, and to draw relevant conclusions.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Milling and milling machine > Program control milling machine and CNC milling machine
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