Study On The Deflection Of Motor Hole And Chatter Of Boring Hole In Flywheel Housing

Flywheel housing is a typical complex thin wall part on the engine,The flywheel shell cylinder mating surface and the gearbox mating surface machining are the key processes of the flywheel shell production line.However,the machining distortion and chatteres often occur during the machining,which seriously affects the production capacity of the entire flywheel shell production line.Based on the analysis on the machining process of the flywheel shell cylinder mating surface and the gearbox mating surface,the positioning and clamping scheme of the fixtures for machining cylinder mating surface and the garbox mating surface were analyzed using Creo software,the assembly models of the fixtures was established.The analysis shows that the common actions of both cutting force and clamping force lead to deformation of the ?88.7 motor hole of the flywheel housing by using ANSYS.The AdvantEdge software was used to simulate and calculate the actual cutting force based on the cutting parameters used to actually machine the motor hole by the company.The actual clamping force was calculated according to the cylinder clamping force formula.The deformation data of the internal marking position of the motor hole was calculated according to the actual working state of the motor hole,and MATLAB software was used to draw the deformation figure of the motor hole.The study found that optimizion of the cutting parameters can not effectively decease the motor hole deformation,but the optimization of the fixture by adding the auxiliary support can effectively reduce the motor hole deformation.Modal analysis on the chatter of the boring ?24 hole was performed to calculate the first ten natural frequencies and vibration mode of the flywheel shell.Through calculations,it was found that the spindle speed of boring 24 holes was within the chatter interval according to the relationship between the natural frequency of the flywheel housing and the exciter frequency.The optimizing of the fixture showed that the addition of auxiliary supports can increase the natural frequency of the flywheel housing and the spindle speed of the boring?24 hole,and change the flutter area to avoid to chatter.The research shows that the addition of auxiliary supports for processing complex thin-walled parts such as flywheel housings can effectively improve the stiffness of thin-walled parts and reduce machining distortion and chatter,and improve the processing quality and processing efficiency of products.