Error Analysis And Research Of Milling Machine

With the rapid development of optical instrument industry and widely used in various fields, optical processing technology is becoming more and more important, it requires not only high efficiency, high precision, but also expanding the scope. Although aspheric development is rapid and popular, aspheric machining is difficult and expensive, so the status of the spherical should not be ignored, it is of great importance to work out an ideal spherical for optical industry.The principle of the spherical milling machine widely used is generation method, for the processing and forming, machine tool adjustment and the choice of process parameters directly affect the surface shape accuracy and surface roughness. In recent years, there is a lack of qualitative and quantitative analysis of spherical surface machining error. So in this article, theoretical analysis and experiments will be combined to study and verify milling machining technology, so as to be helpful to machining precision control and rational use of milling machining. This topic research content mainly includes the following:1. Through the analysis of the truncated circular sphere molding, the mathematical model of spatial bias between grinding wheel axle and work piece axis is established, and the error equation is calculated. The programming of theoretical equation and error equation is built by the mathematical software MATLAB, which is used to analysis the YZ section, XY section of Z direction error and radial error as well as comprehensive error. The result is that both grinding wheel diameter and two axis eccentricity have influence on the spherical surface precision, and the influence regulation and the degree is further analyzed, which provide a theoretical basis for the test;2. The orthogonal test method is used to study the influence of factors such as the grinding wheel axle shaft speed, artifact speed, grinding force and grinding wheel granularity on the milling products surface roughness. L16 (45) orthogonal table is chosen with an empty column that can be used to increase the reliability of test and the surface roughness parameters are used for the as the judgment standard. Through analysis of range and variance analysis method, the degree and regularity of milling parameters on the surface roughness is obtained as well as the optimal milling parameters;3. Through study the measurement method of the three coordinate measuring machine, the artifact coordinates system is established and the artifact surface data is acquired through surface curve-point set-point. The X,Y,Z artifact coordinate points are pre-processed by Excel such as the coordinate rotation transform, coordinate translation alignment, thus set a foundation for surface reconstruction and error analysis with MATLAB;4. The single factor test method is used to study the influence of different grinding wheel diameter and different axis offset on spherical surface precision. Data after processing is imported to MATLAB, and then fitted. The error of fitting curve and theoretical curve and error change of cross section is calculated so as to verify the correctness of the theoretical analysis.