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Effect of downward depth and inflation pressure on contact force of gasbag polishing.pdf

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Precision Engineering 47 (2017) 81–89 Contents lists available at ScienceDirect Precision Engineering journal homepage: /locate/precision Effect of downward depth and in?ation pressure on contact force of gasbag polishing Mingsheng Jin ?, Shiming Ji, Ye Pan, Haiping Ao, Shuaifei Han Key Laboratory of Special Purpose Equipment and Advanced Processing Technology at Zhejiang University of Technology, Ministry of Education, Hangzhou 310014, China article info Article history: Received 22 January 2015 Received in revised form 28 June 2016 Accepted 12 July 2016 Available online 27 July 2016 Keywords: Gasbag polishing Contact force Control system Surface quality abstract Gasbag polishing is a kind of ultra-precision machining technology by means of ?exible contact, while how to control the polishing contact force online is one of the key issues. In this paper, by analyzing the effect of downward depth and in?ation pressure on the contact force experimentally, and then the coupling contact force model is developed. Thus, the predictions of polishing contact force and in?ation pressure in terms of the nonlinear composite material of rubber gasbag can be obtained, which can be used to get the optional combination and controllable range of polishing contact force, and to construct the control system of coupling contact force as well. Experimental study shows that applying coupling contact force model to the control system of gasbag polishing contact force with BP neural network PID control strategy is a proper method, which realizes the polishing contact force controllable online and uniform surface quality of mold. ? 2016 Elsevier Inc. All rights reserved. 1. Introduction Abrasive machining technology is widely used in the precision engineering via the erosion between the abrasive particles and workpiece, such as abrasive jet micro-machining [1], high speed grinding [2] and ?xed abrasive lapping [3]. To polish the free-form surface of mold using gasbag polishing technique is