Simulation And Experimental Study Of Cutting Deformation Of Thin-walled Parts

Thin-walled parts refers to the thickness size is far lower than the other two directions.Because of their higher strength, lighter quality, compact structure,good overall performance,saving material, beautiful appearance and so on, they are widely used in the modern aviation, aerospace and defense industries, such as aircraft, precision forging frame, whole beam structure, the whole floor.However owing to low rigidity, easily deformed, unreasonable choice of cutting parameters, changing the location of the cutting force, it will seriously affect the surface precision efficiency.Therefore, in order to reduce the deformation, improve the surface quality and machining accuracy of parts, and save working hours, it is necessary to make a deep research on the machining deformation of thin wall parts. In this paper, based on the theory of finite element simulation, NC machining and high speed milling, the rule of cutting deformation and control measures are studied. Specific work is as follows:1) Based on the Reciprocal Theorem, a finite element mathematical model of thin-walled NC milling deformation is established. According to the mechanics of metal cutting, the milling process is simplified.Using finite element simulation technology,this paper establishes the mathematical model of machining deformation of thin walled parts.2) Using the finite element software (Ansys14.0) analyzes the deformation of the cutting position, cutting parameters, tool parameters and cutting force of milling of thin-walled parts. By the finite element software,this paper studies the effect of the cutting parameters (the radial depth of cut, feed per tooth, axial cutting depth, spindle speed),cutting force and cutting position on cutting deformation, which provides good evidence for actual cutting.3)The NC milling experiments of thin-walled parts are carried out. Through the cutting experiment, the mathematical model of machining deformation and simulation are verified by experiment. Through the experiment of NC milling, the results of numerical control experiment and simulation results are in good agreement, which verifies the mathematical model and finite element simulation results.This paper studies the machining deformation of thin walled parts, which provides the data support for the thin-walled machining simulation technology and NC machining. Moreover, this paper establishes the finite element simulation and NC experiment, which obtains deformation rules of thin-walled parts.This paper provides the theoretical support and practical guidance for the production.