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Dynamic Simulation for Machining Process

Author: LiJinSong
Tutor: XiongCaiHua
School: Huazhong University of Science and Technology
Course: Mechanical and Electronic Engineering
Keywords: Machining Dynamics simulation Orthogonal cutting Finite Element Flutter Stability
CLC: TH113
Type: Master's thesis
Year: 2007
Downloads: 255
Quote: 1
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Abstract


The dynamic characteristic of the CNC machine is one of the important factors that affect the efficiency of machining. In-depth understanding of the physical behavior of the cutting process, a correct understanding of the dynamic characteristics of the cutting, and put forward the principles and methods to improve the performance of CNC machining, machining research areas is an important topic. In this paper, CNC machining dynamics problems, multidisciplinary field of application of metal cutting theory, the elastic-plastic mechanics, numerical methods, automatic control theory, simulation technology knowledge and technology, research based on the finite element model of the coupled thermo milling to strive solution algorithm to implement the conventional milling process flutter stability domain simulation, and analysis of the dynamic characteristics of the high-speed CNC machining process, to provide theoretical guidance for optimizing the processing parameters, the efficiency of the actual processing. The first chapter describes the background and significance of the thesis, summed up the study of the current situation of numerical control machining simulation technology at home and abroad, more practical and easy means to put forward based on the study of the stability of the processing dynamics, optimize processing parameters to improve the processing efficiency. The Chapter II chip based on MCShaw proposed can be assumed to be a series of the the parallel orthogonal slices ideas that the milling force parameters can be obtained by the orthogonal cutting experiments. On this basis, based on the principle of metal cutting, the establishment of a finite element model of orthogonal metal cutting coupled thermo study a number of key technologies involved in the finite element simulation and analysis of simulation results obtained orthogonal cutting cutting force coefficients. Chapter vibration process, the analysis of the dynamic characteristics of the actual processing system. Simplify the tool - workpiece system for the X, Y direction orthogonal spring - damping model. Based on the Nyquist stability theory, simulation of the milling process flutter stability region. And the results were analyzed. Chapter IV for high-speed processing, analysis of its dynamic characteristics. Pointed out the limitations and inadequacies of the linear theory. For small depth of cut caused the tool nonlinear flutter proposed to TFEA method is ideal for solving high-speed processing stability. Based on this approach, stability analysis using bifurcation theory. Chapter V of the full text of the work summarized, and pending further research.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanics (mechanical design of the basic theory ) > Mechanical kinetics
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