Mechanism Analysis And Device Design Of Vibration Suppression In Milling Weakly Rigid Thin Walled Blades

Thin walled components have been widely used in the aerospace field,but their large size,complex profile,and poor stiffness make them prone to cutting chatter during the machining process.Cutting chatter seriously affects the machining efficiency,machining accuracy and surface quality of parts.At the same time,it can also accelerate tool wear and damage,and even lead to parts scrapping.Therefore,this article mainly focuses on the development and analysis of a vibration suppression device for processing weakly rigid thin-walled parts of nickel based high-temperature alloys.Firstly,explore the sources of vibration generation in machining and the principles of suppressing vibration.Conduct dynamic analysis on the machining vibration system,analyze the motion equations of a single degree of freedom system and a damping system,and combine them.Explain the mechanism of forced vibration and emphasize the importance of reducing forced vibration.Based on this,the principle of action of the vibration absorbing structure is applied to the system,and the vibration suppression method of the vibration absorbing structure is explained in detail through equation calculation.Secondly,establish a machining system model and import it into ABAQUS for simulation analysis of the milling process.Simplify the machining process based on a model of a two degree of freedom damped system,and import the simplified model into ABAQUS.Using dynamic simulation methods,through milling simulation of nickel based high-temperature alloys,compare the milling forces under different axial cutting depths,radial cutting depths,feed rate per tooth,cutting speed and other machining parameters,and explore the impact of different milling parameters on milling forces.Analyze the deformation caused by milling force during the processing of thin-walled parts.Finally,based on the simulation analysis results,design the vibration suppression fixture.Optimize the ability of the vibration suppression device to adapt to the machining process based on the size and position of the deformation of thin-walled parts during processing,so that it can change the clamping point position as the machining progresses.Design the clamping part based on a single degree of freedom damping system.Verify the vibration suppression effect of the fixture by comparing the vibration intensity and deformation of the workpiece before and after installation.