Research Of Electromagnetic Propulsion For Cylindrical Roller In The Process Of Machining

Bearing is widely used in various types of machinery and equipment,mainly used to support the mechanical body of revolution.Cylindrical roller plays the role of load transfer and support in bearings.The processing quality of roller cylindrical surface greatly affects the service performance of bearings.In order to improve the accuracy and efficiency of roller cylindrical surface grinding,a double disk straight groove grinding method has been proposed.In this method,using cylinders to push rollers,there will be time gap in the pushing process,which leads to the discontinuous motion of the roller,and the device structure is complex,occupying a large space,and the operation and debugging is inconvenient.In order to realize continuous feeding of rollers and make up for the shortcomings of mechanical feeding method,an electromagnetic propulsion method which can convert electromagnetic energy into mechanical energy is studied.Based on the research of cylindrical linear induction motor,its working principle had been analyzed,and an electromagnetic propulsion model suitable for pushing material in cylindrical roller grinding had been designed.It mainly includes model structure design,winding design and material selection,and validates the effectiveness of parameter design through equivalent circuit.On this basis,the corresponding simulation model is established by ANSYS Maxwell.In order to verify the accuracy of the design model,the existing cylindrical linear induction motor is used to build a force measuring platform to measure the electromagnetic thrust of cylindrical roller under the action of the motor.The relationship between the force of the roller and the voltage and frequency of the power supply is obtained through the statistics of the experimental results.After the force measurement experiment,the motor was disassembled and the specific structure parameters of the motor are obtained.The parameters of the motor are brought into the electromagnetic propulsion simulation model.The magnetic field distribution had been analyzed and the electromagnetic thrust had been calculated under the same excitation conditions.The accuracy of electromagnetic propulsion model design had been verified by comparing the results of simulation and experiment.The results show that the traveling wave magnetic field moving along its axis will be generated in the propulsion model.The magnetic field can be coupled with the magnetic field of the roller induced current in the model and periodically distributed between each pole of the model.The force magnitude of each roller is different,but it changes regularly and periodically.The electromagnetic thrust force of the whole rollers is basically stable.With the increase of the voltage or frequency of the excitation power supply,the combined force of electromagnetic thrust on the roller increases.The experimental results are close to the simulation results,which proves the validity of the propulsion model design.Then,using method of orthogonal experimental to optimize structural parameters of propulsion model.Taking the magnitude of electromagnetic thrust and the range of thrust fluctuation as test indexes,the order of optimizing parameters had been determined as voltage,the thickness of support ring and the ratio of tooth width to slot width.And the optimal combination of parameters has been obtained.