Papers by Author: P. Chen

Abstract: Based on image processing, a new method to straighten the electrolysis plate is proposed. This method uses two CCD cameras to grab images of plate edge and the computer extracts the edge and filters the image. With matrix transformation and calculating of the mechanical model, the motion parameters of the straightening device will be acquired. The straightening device straightens the negative plate as the parameters given. This method can make the curved quantity of electrolysis plate from 80mm down to 2mm or less, achieving an ideal straightening effect.

Abstract: Aiming at the problem of analyzing for the dynamic performances of the spindle bearings running at an extreme ultra-high-speed in high-speed electric spindles, a model is built by taking the inertia effects and EHL at the extreme ultra-high-speed into account. Based on the system simulation about a bearing on the movements of every ball, the contact areas states and the lubrication states between balls and both ring raceways, the thermal state inside the bearing and so on, the internal state performances such as the movements and the inertia forces of all the balls, the contact forces and the lubrication films and the temperatures in the contact areas between balls and both ring raceways are analyzed in some different working conditions and configurations. The simulation results showed that the main factors affecting the state performances of a bearing running at an extreme ultra-high-speed are the inertia effects of the balls and the overheating in the contact areas between the balls and both ring raceways, which indicates that it can be improved by adopting the ball material with smaller mass density and the structure with a smaller ball diameter and more ball elements.