Study On Multi-axis Synchronous Control Of Gear Hobbing Machine Based On Electronic Gearbox

As the basic components of the mechanical manufacturing industry,gears have placed increasing demands on their machining accuracy and performance.CNC hobbing machine tools are commonly used as numerical control equipment in the gear processing industry.The performance of the CNC system directly determines the gear machining accuracy.As the core of the gear processing control system,the electronic gearbox technology directly determines the control performance of the CNC system and the machining accuracy of the gear.Research on the control performance of electronic gearboxes is of great significance for improving the control performance of CNC machine tools and achieving high-precision gear machining.Based on the background of this research,this paper studies the control method of multi-axis synchronous motion of gear rolling machine.By analyzing geometric error of gear machining,establishing mathematical model of error,calculating the compensation of machine tool axis,designing electronic gearbox compensation method,software simulation.Finally,it is applied to the self-developed hobbing CNC system for machining experiment verification.The content are as follows:(1)Firstly,the linkage analysis of the movement axes of-the machine tool during the hobbing process is done,the mathematical model of the hobbing machining is derived.Combined with the characteristics of hobbing processing technology to design and select the electronic gearbox structure form,and a master-slave composite electronic gearbox was finalized,the gear workpieces with different machining parameters can be adapted by adjusting the relevant motion axis control coefficients of the electronic gearbox.(2)According to the relative position relationship between the tool and the workpiece during the gear machining process,the mathemalical model of the tooth profile deviation,the tooth pitch deviation and the spiral deviation is established.The relationship between the above three error models and the motion errors of the machine axes is analyzed.so that the motion compensation of the machine tool motion can be calculated.According to the compensation method,the motion compensation imodes of the single axis and the multi-axis are all determined.Through the MATLAB simulation,the compensation method of the single axis motion was finalized.(3)By studying the control principle and optimization process of particle swarm optimization algorithm,the effectiveness of particle swarm optimization algorithm for multi-objective optimization is verified,and the particle swarm algorithm is used to optimize the multi-axis PID parameters of the machine tool and the control coefficients of the electronic gearbox.In this way,the optimal control parameters are determined,thereby further improving the control performance of the electronic gearbox and improving the machining accuracy of the gear.(4)Applying the established electronic gearbox control model to the independently developed hobbing CNC system,and matching the CNC system with the model YGS3610BCNC hobbing machine for hobbing of standard test gears.The standard gears can be processed.Up to 5 levels of accuracy,fully proved the practicality of the multi-axis synchronous motion control method proposed in this paper for high-precision gear processing.