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Research On Milling Stability Of Non-standard Milling Cutter Based On Machining Dynamic Characteristics

Posted on:2020-10-11Degree:MasterType:Thesis
Country:ChinaCandidate:X Y CuiFull Text:PDF
GTID:2481306518458654Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
Thin-walled parts are prone to chatter due to their weak rigidity during milling.In this paper,the milling of thin-walled parts is studied,and the milling stability and surface location error of non-standard milling cutters are studied based on machining dynamics.The main contents are as follows:1.One of the causes of milled chatter is the regenerative effect.By reducing the modulation of the cutting thickness,the non-standard milling cutter can suppress the generation and development of flutter and increase the stability of the milling process system.By introducing nonlinear coefficients,the dynamic cutting force model of milling machining considering the pitch angle and the helix angle is established,and the stability is solved.The stability lobe diagram of the non-standard milling cutter is obtained.2.The optimization of the pitch angle and the helix angle of the non-standard milling cutter with the minimum milling energy is optimized by genetic algorithm and differential evolution algorithm.The optimized non-standard milling cutter is analyzed by time domain based on the stability lobe diagram.The stability criterion is given based on the periodic sampling method in the X and Y directions.The Largest Lyapunov exponent is used to characterize the nonlinear characteristics of the milling system.The processing signals obtained by the milling experiment are analyzed and verified.3.The surface location error caused by forced vibration in a stable milling state is studied,and the milling force is expanded into a Fourier series form in the frequency domain to calculate the surface location error.Analyze factors affecting surface location error,including milling mode,spindle speed,radial depth of cut,axial depth of cut,and feed per tooth.The stability lobe diagram and surface location error are represented in the same graph,and they are synchronously predicted to obtain processing parameters that meet the requirements of milling stability and meet the requirements of efficiency and surface quality.
Keywords/Search Tags:Milling force, Milling chatter, Non-standard milling cutter, Dynamic characteristics, Surface location error
PDF Full Text Request
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