Research On Axis Correction Technology For Deep Hole Machining Of Transmission Shaft Gears

The machinery manufacturing industry often refers to holes with a length-to-diameter ratio greater than 5 as "deep holes".Most of the deep hole machining tools are slender and have weaker rigidity.At the same time,the tool force during deep hole machining is more complicated than shallow hole machining.Severe axis deflection greatly restricts the linear accuracy of deep holes.This article intends to study the control plan of the axis deflection of the medium and small diameter deep hole with the machining of a deep long hole with a diameter of 27.1mm,a length of 443 mm and a length-to-diameter ratio of 16.3 on a passenger car transmission shaft gear,combined with the existing axis correction theory.Firstly analyze the mechanism of axis deflection in deep hole machining and establish a mathematical model of axis deflection;analyze the influence trend of machining parameters on axis deflection based on single factor machining experiments,and use MATLAB to fit the axis deflection to obtain an exponential empirical formula.Then establish the force model and stability model of the gun drill bit,analyze the impact trend of key parameters of the bit on its force state and stability;take the maximum stability as the objective function,optimize the key structure parameters of the bit,and use finite element simulation and processing Experiment to verify the optimization effect.The results show that through optimization,the stability of the drill bit is improved by about 50%,the deformation at the drill bit is reduced by about 11.7%,and the final axis deflection is reduced by about 18.64%compared with that before optimization.Next on design a deep hole machining correction and vibration reduction device with a multi-oil wedge structure as the core;based on the theory of fluid mechanics,mathematically model the oil film pressure in the wedge-shaped space before and after the drill pipe is eccentric,calculate the oil film pressure numerically,and verify it with FLUENT fluid simulation Theoretical analysis: With the help of ANSYS and SIMULINK,the dynamic characteristics of the system before and after the installation of the correction and vibration reduction device are analyzed.The analysis shows that the installation of the correction and vibration reduction device can effectively suppress the vibration of the drill pipe and improve the linear accuracy of the deep hole.Lastly with the help of Euler beam theory,analyze the mechanism of axial vibration to improve the axis deflection of deep hole;based on DEFORM-3D,simulate the force state of axial vibration drilling and conventional deep hole machining;compare the two kinds of processing with ANSYS The deflection amount of the axis of the drill bit under this method,the results show that the deformation amount of the axial vibration drilling bit is reduced by about 18.35% compared with the conventional machining,which can improve the linear accuracy to a certain extent.