Papers by Author: Feng Lu

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Authors: Di Zheng, Feng Lu, Li Yong Hu, Yong Jie Shi
Abstract: In mechanical equipments or manufacturing processes, force control is definitely required to achieve desired performance or to ensure product quality. Aiming at this issue, this paper introduced an author-invented torque servo device that utilizes magnetorheological fluids (MRF) to provide a controllable torque. In the paper, the structure and working principle of the MRF-based torque servo device (MRT) were introduced, the constitutive model and the characteristics of the MRF were established and discussed. On the basis, the static and dynamic models of the MRT were both analytically and experimentally studied, and the control of the output torque of the MRT was demonstrated. As an example, the application of the MRT to the polishing of aspheric surfaces was presented in the end.
Authors: Di Zheng, Yong Jiang Yu, Xian Hua Zhang, Xiao Jun Zhao, Yuan Wang, Yong Jie Shi, Feng Lu
Abstract: The objective of this paper is to investigate the effect of shape and size of polishing pad on the material removal characteristics in the NC polishing. The material removal model was established based on Preston equation. The law of the effect of shape and size of polishing pad on the model was simulated. Experiments were carried out. Results showed that both of the shape and size of polishing pads influence the shape of material removal curves, polishing efficiency, and surface roughness. The amount of removed material increases with the increasing of size of polishing pad.
Authors: Di Zheng, Yong Jie Shi, Yuan Wang, Xiao Jun Zhao, Lun Pan, Feng Lu
Abstract: The objective of this paper is to investigate the effect of radius of curvature on the material removal in the NC polishing of aspheric part. The models of polishing pressure and material removal rates were established based on Preston equation and Hertz theory. The material removal rates was analyzed. Experiments were carried out. Results showed that the material removal rate varies with the variations of the curvature under a constant polishing force and velocity, and the part can not be polished uniformly.
Authors: Feng Lu, Di Zheng, Yong Jie Shi, Bin Huang
Abstract: Magnetorheological fluid torque servo (MRT) is a novel torque generating and controlling device. It converts the rotational input of active shearing disc into the torque output of passive shearing disc by controlling the rheological property of the magnetorheological fluid. In this paper, the working principle of the MRT was introduced. The effects of the input rotational speed on the shear stress of the magnetorheological fluid and then the output torque were analyzed. The model describing the relationship of the output torque with respect to the rotational speed of the active shearing disc as well as to other parameters was established. A critical rotational speed was deduced. The factors affecting the critical speed were discussed, and an experiment was conducted to ascertain the validity of the theoretical analysis.
Authors: Di Zheng, Feng Lu, Li Zhong Zhang, Yong Jie Shi
Abstract: The force-position decoupling technology based on Magnetorheological Fluid Torque Servo (MRT) can effectively solve the force-position coupling problem existed commonly in polishing processes. In the new polishing system, polishing force is not generated directly by the displacement of polishing tool, but provided by the MRT. Polishing path planning is another key point of the force-position decoupling technology. In this paper, a polishing path planning method was proposed, and the effect of polishing tool path on polishing parameters was analyzed. The law obtained will guide the uniform material removal of aspheric surfaces.
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