Research On Grinding Force Mechanism Of Spiral Bevel Gear Rotational Ultrasonic Vibration Assisted Grinding

Spiral bevel gear has the advantages of long service life and low noise.It is mainly used in key mechanical components of aerospace,navigation,automobile and other industries.The major strategy of China’s overall transformation to "made in China" puts forward higher requirements for the machining accuracy of spiral bevel gears.Therefore,on the basis of traditional grinding,ultrasonic vibration is introduced to process spiral bevel gear,change the forming mechanism of spiral bevel gear tooth surface and reduce the grinding force.It is directly related to the durability of grinding wheel.Therefore,it can be evaluated as the evaluation parameter of grinding results.Aiming to reduce the grinding force when grinding spiral bevel gears.The main contents of this thesis are described as follows.The relative motion between grinding wheel and workpiece is processed according to ordinary grinding and rotary ultrasonic vibration assisted grinding,the kinematics formula of a single abrasive particle is established.According to the kinematic formula of single abrasive particle,the motion trajectory of single abrasive particle grinding is simulated and analyzed,and the formulas of abrasive particle vibration times and cutting arc length are derived.Then through analysis,the parameters of grinding are determined.The mathematical model of cutting deformation force is established according to the cutting force diagram of a single abrasive particle and the undeformed cutting thickness of abrasive particle obeying Rayleigh distribution.According to the grinding capacity parameters,the mathematical model of friction is established;The interference of adjacent abrasive particles is simulated and analyzed by MATLAB software,and the forming mechanism of grinding surface is analyzed.Finally,the influence factors of ultrasonic vibration on grinding force are summarized.According to the constitutive equation of 45 steel Johnson cook,the finite element analysis of ordinary grinding and rotary ultrasonic vibration assisted grinding of spiral bevel gear is carried out by ABAQUS software.1.The conclusion that applying ultrasonic vibration to the axial direction of the grinding wheel can reduce the grinding force.The theoretical model is verified by the simulation results,and the cutting depth is verified by cutting simulation The results show that the increase of ultrasonic vibration frequency can restrain the grinding force and make the tooth groove wider;The increase of speed does not inhibit the grinding force,but shorter chips are formed in the cutting process,the grinding force is greater and greater,but the tooth surface grooves are wider and orderly.