| Induction heating,as a rapid surface heating method,is commonly used in the heat treatment process of transmission parts such as screws and gears,to achieve high hardness and wear resistance on the surface of quenched parts,while maintaining the characteristics of the original material in the core.The surface structure of the ball screw is complex and uneven.When the ball screw is quenched by single frequency induction heating,the temperature distribution on the surface of the ball screw is often uneven,resulting in the failure of the bottom and top of the ball screw raceway to harden at the same time,resulting in surface cracks of the ball screw in subsequent processing.Based on this,this paper uses the finite element numerical simulation method to study the dynamic dual frequency induction heating process of the ball screw,and analyzes the influence of various factors on its heating effect to improve the heating quality of the ball screw.Firstly,based on the defects and shortcomings of the commonly used induction heat treatment process for ball screws,a dynamic dual frequency induction heating method for ball screws was proposed,and an induction coil structure was designed.Based on the ANSYS software,the static intermediate frequency induction heating numerical simulation of the ball screw was carried out,and the changes of the temperature field of the ball screw at different times and the causes of formation were analyzed,Provide a reference basis for selecting dynamic dual frequency induction heating parameters for ball screw.Then,combined with the existing finite element software’s inability to achieve continuous motion induction heating calculation and the inability to simultaneously apply two different frequency power sources,a "load movement equivalent calculation method" for dynamic dual frequency induction heating of ball screws was proposed,and a multi field coupling model of ball screw induction plus thermoelectric magnetic thermal motion was established.On this basis,numerical simulation of dynamic dual frequency induction heating of ball screw is conducted,analyzing the evolution process and formation reasons of heat source during the dynamic dual frequency induction heating process of ball screw.The numerical simulation of dynamic dual frequency induction heating of ball screw is carried out by sequentially changing the current density ratio,current frequency ratio,induction coil spacing ratio,and ball screw speed,and exploring the influence of various heating process parameters on dynamic dual frequency induction heating of ball screw.Finally,establish an experimental platform for electromagnetic induction heating of ball screws,conduct dynamic dual frequency induction heating experiments on ball screws,compare experimental data with simulation data,and verify the reliability of the numerical simulation model. |
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