Finite-element Simulation And Experimental Research On The Bearing Induction Heating Replacer

In the process of mechanical assembly and maintenance, their often encounter bearing installation and disassembly issues. There are many methods used for installing and demounting bearings inside and outside our country. Such as: hand to knock, using press machine, boiled in oil, baking, using assistant heated yoke, flame heating etc. Majority of these methods can only be used for installing bearing and not for demounting, and polluting the environment, wasting energy, time-consuming, hard seldding and poor heating quality, also cause damage to shaft and bearing or even scrapped. Comparing with above-mentioned methods, induction heating for installing and demounting bearing is the most advanced and most scientific method. It has the advantages of energy-saving, safe, non-polluting, high heating quality, efficiency, easy to realize the automation. This dissertation is from Science and Technology Development Projects of Jilin Province "Exploiture and Technology Study of Rapid and Non-destructive Bearing Induction Heating Replacer", aim at the bearing inner race non-destructive install and demount issue of track Bus Co., Ltd. in Changchun, dissertation do the shudy as the followed.1. Based on the theory, designed induction heating replacer for bearing inner race. It is composed of mechanical parts and electronic control parts. The biggest characteristic of the device is that it has clamping function and the clamping radius is variable. It can be used for different types of bearings. Control system has overcurrent protection, and creepage protection, over-voltage protection, null-voltage protection, temperature protection, timing protection.2. Bearing inner race electromagnetic and temperature field numerical simulation in the process of electromagnetic induction heating. In order to study the mechanism of the induction heating theory, in accordance with the device that designed, paper build a corresponding simplified model. First, based on Maxwell's equations, use A-φmethod to built the mathmatical model of eddy current anslysis, which simplifies the analysis of electromagnetic field, obtain eddy current variational problem of the heating model. Second, use Galerkin finite-element method obtain eddy current field finite element equation. Based on Fourier differential equations about solid conduction, taking induced eddy current as the internal heat reservoir, use Galerkin finite-element method, after the complex analysis and synthesis, obtain temperature field finite element equation. Finally, a numerical calculation demonstrated the eddy current skin effort in the bearing inner race when the replacer is working.3. Induction Heating MATLAB simulation and ANSYS finite-element simulation. According to the numerical equation in electromagnetic field generatored MATLAB simulation program. Obtained distribution curve of the skin depth with the frequency changes in the process of heating. This again proved the skin effort in heating process. By ANSYS finite-element simulation, paper get distribution of electromagnetic fields, eddy current density, temperature distribution and so on. Provided with necessary parameters for the production of the replacer, reduce the workload of production.4. Through theoretical analysis and computer simulation, obtain basic design scheme and main parameter for bearing inner race induction heating replacer. Based on this, dissertation trail manufacture a replacer. In order to verify correctness of the design programme, we do some feasibility test and experiment. By measuring different isothermal surface temperature changes on the bearing inner race, we obtain temperature rise curves of different isothermal surface. Through measurement of the expansion size about the bearing inner diameter, we obtain expansion size curve of the bearing inner diameter in the process of heating.After the above study, the paper reveals eddy current field,temperature field regularities of distribution in bearing inner race in the working process of the induction heating replacer. And manufacture a experimental prototype, and verified through tests that the replacer meet the requirements of non-destructive dismounting.5. Generalize research conclusion of the former study and basis on this, make a plan of the work to do and technical problems to resolve in the next stage.