| Conducting bar used in the Non-ferrous metal electrolysis industry are both great guide current and load-bearing. The conductivity of conductive rod has a very close relationship with the quality of nickel plate. The chemicals forming on the surface of the conducting bar after one electrolytic cycle will have a great influence on the conductivity. Also the production process will be influenced when the lifting lugs were burned out. Therefore, if the conductive rods are well polished,the quality will be greatly improved.The existing domestic technology and equipment cannot meet the need of the polishing accuracy of the conductive copper. We propose a centerless polishing device as the study object. The main achievements are:1. Through analyzing to the structure of centerless polisher frame by finite element method, the paper accurately reflects the affects of the forces with certainly frequency to the centerless polisher frame, when the grinding wheel and regulating wheel revolved by the electro-mechanic driving system. It provides the foundation in the theory, in order to avoid damage of system resonance and the other causes. In addition, the dynamic deflection of Centerless Polishing Machine is also obtained, which provides the basis for simulation of dynamic stability in the follow-up.2. The influence of contact tube's straightness error is discussed when it used in the tank of nickel cathode through theoretical analysis, deriving the stable polishing condition which has nothing to do with the center of gravity angle of rotation, obtaining the biggest straight line value when the work-piece has different rotational speed (or guide wheel rotational speed) in the stable polishing process; so it constitutes a powerful tool to provide the theoretical basis for the reasonable choice polishing depth, increasing the precision of the centerless polishing process.3. Based on the theory of quasi-dynamics generation mechanism of harmonic component, indicators for the evaluation of the rounded coefficient, the harmonic component stability of the polishing process is discussed; also the mathematical model of harmonic component has been established. Based on the Levenberg-Marquardt optimization method, the simulation has been made. Comparing the simulation results with the theoretical results, the validity of the model can be illustrated, the model can be used before the actual processing, thereby increasing productivity.4. Under certain conditions, the speed of work-piece (or guide wheel speed) and the center height which have a great impact on the stability of the polishing system are analyzed。The characteristic equation of the polishing system has been established, based on the root locus method, the characteristic root distribution graph of the centerless polishing system is derived by using MATLAB software, and then the diagram of the vibration stability is derived simplified, and non-flutter region can be identified through the stability of the chart.5. The results of the previous as a precondition are used after establishing target function, choice of parameters and confirmation of constraint conditions of the centerless polishing parameters are systematically studied, its optimum mathematical model is setup. The parameters are designed by MATLAB Optimization Toolbox and achieve the best, it simplifies the computer programs and enhances the design efficiency and quality.6. The tilt angle of regulating wheel,center-height of work-piece and depth of cut were studied by using orthogonal test design in the condition of 6 different rotational speed of regulating wheel. And then the surface quality of work-piece was analyzed.It's changing rules influenced by the different factors (the tilt angle of regulating wheel,center-height of work-piece and depth of cut) were obtained with changing the rotational speed of regulating wheel. |
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