雙擺角數(shù)控萬(wàn)能銑頭靜動(dòng)態(tài)特性分析
[Abstract]:As the mainstream machining equipment in modern manufacturing industry, NC machine tool has a broad application prospect, while double pendulum angle NC universal milling head is the core component of five-axis NC machine tool. Its structure and performance largely determine the performance of the whole machine tool. In this paper, the static and dynamic characteristics of double pendulum angle NC universal milling head are analyzed by combining theory, simulation and experiment. Firstly, the general layout, working principle, temperature control and error source of double pendulum angle milling head are analyzed. Based on the theory of multi-body kinematics, the geometric motion error model of double pendulum angle milling head is established. The error component of the geometric motion error of the double pendulum milling head in the base coordinates is obtained. The influence of the A-axis swing on the geometric error of the milling head is analyzed according to the error model. Secondly, the finite element model of double pendulum milling head is established, and the parts saved from the simplified model are added to the model in the form of mass points to ensure the correctness of the finite element model. Considering the three working conditions and the real force of the double pendulum angle milling head, the static analysis of the double pendulum angle milling head is carried out in two steps, and the maximum deformation and the maximum stress of the double pendulum angle milling head under the action of cutting force are obtained. The static stiffness of the milling head is calculated. Then, on the basis of static analysis, modal analysis and harmonic response analysis of double pendulum milling head are carried out, and the first 6 natural frequencies, vibration modes and displacement response curves of cutter base center of milling head under three conditions are obtained, respectively. The minimum dynamic stiffness of the milling head is obtained by calculation. Finally, the static test of double pendulum milling head is carried out. In order to meet the need of loading, a special force application mechanism for machine tool testing is designed. A static test method of milling head is presented, and the actual deformation of milling head under different loads is obtained, which provides an effective technical support for the design and optimization of double pendulum milling head.
【學(xué)位授予單位】:蘇州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TG659
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