吉林大学学报(工学版) ›› 2012, Vol. 42 ›› Issue (01): 116-121.

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Force-position-posture decoupling technique for NC polishing of aspherical part

SHI Yong-jie1,2,3, ZHENG Di1,2, HU Li-yong2, WANG Long-shan3   

  1. 1. Ningbo Institute of Technology,Zhejiang University,Ningbo 315100,China;
    2. College of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China;
    3. College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China
  • Received:2010-12-29 Online:2012-01-01 Published:2012-01-01

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Abstract:

A novel force-position-posture decoupling technique was proposed based on a magnetorheological fluid torque-servo(MRT) to solve the coupling problem in the numerical control(NC) automatic polishing system of the asphesical surface. The mechanism of the force-position-posture coupling was investigated based on Hertz contact theory and the tribological principle, and a coupling model was built. The MRT-based force-position-posture decoupling principle was studied, a corresponding polishing experiment system was developed. A polishing foree control model was established, and the path of the polishing tool was planned. Experiments were cassied out and a missos-like aspherical surface with a roughness of Ra≤0.025 μm was obtained. The results proved that using the proposed decoupling techniue, the polishing force, the tool position and posture can be controlled independently, actively and simultaneoushly during the polishing process.

Key words: mechanical manufacture and automation, polishing force, position of polishing tool, posture of polishing tool, magnetorheological fluid torque-servo(MRT), Hertz contact theory, aspherical surface, NC polishing

CLC Number: 

  • TH166


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