Chao Lin

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (2)2.74 Total impact

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    ABSTRACT: Diamond turning assisted by fast tool servo is of high efficiency for the fabrication of freeform optics. This paper describes a long-stroke fast tool servo to obtain a large-amplitude tool motion. It has the advantage of low cost and higher stiffness and natural frequency than other flexure-based long-stroke fast tool servo systems. The fast tool servo is actuated by a voice coil motor and guided by a flexure-hinge structure. Open-loop and close-loop control tests are conducted on the testing platform. While fast tool servo system is an additional motion axis for a diamond turning machine, a tool center adjustment method is described to confirm tool center position in the machine tool coordinate system when the fast tool servo system is fixed on the diamond turning machine. Last, a sinusoidal surface is machined and the results demonstrate that the tool adjustment method is efficient and precise for a flexure-based fast tool servo system, and the fast tool servo system works well on the fabrication of freeform optics. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
    Optical Engineering 09/2014; 53(9):092005. DOI:10.1117/1.OE.53.9.092005 · 0.96 Impact Factor
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    ABSTRACT: This paper describes the development of the fast tool servo (FTS) in detail and categorizes existing FTSs according to different principles. The characteristics and differences of these FTSs have been analyzed. A flexure-based long-stroke FTS system for diamond turning is presented with displacement range of 1mm and bandwidths of 10Hz. The vertical jump is about 0.045μm, and the full stroke tracking error is less than 0.15%. A voice coil motor and a piezoelectric actuator are used as the driving elements, and two flexure hinges are developed as the guide mechanisms. The FTS utilizes a linear encoder and a capacitive sensor to measure the displacement of the tool for closed-loop control. The electromechanical design of the FTS and its motion analysis are described. Experimental tests have been carried out to verify the performance of the FTS system. This long-stroke FTS has the advantage of easy machining, high resonance frequency, and error compensation in y-axis direction. KeywordsFast tool servo–Diamond turning–Voice coil motor–Piezoelectric actuator–Flexure hinge
    International Journal of Advanced Manufacturing Technology 04/2011; 59(9):859-867. DOI:10.1007/s00170-011-3556-3 · 1.78 Impact Factor

Publication Stats

6 Citations
2.74 Total Impact Points

Institutions

  • 2014
    • Chinese Academy of Sciences
      Peping, Beijing, China
  • 2011
    • Changchun Institute of Optics, Fine Mechanics and Physics
      Hsin-ching, Jilin Sheng, China