Study On The Error Evaluation Of Complicated Surface Profile And The Influence Of Process Parameters On Its Error

Since the 21 st century,with the development of new industries,the machinery manufacturing industry is moving from the introduction of high-end technology from abroad to the core of independent research and development.When aerospace,medical diagnosis and treatment,household appliances,automotive equipment,etc.involve high-precision requirements,most The curved surface of the parts is complex and diverse,and the required accuracy of the curved shape is relatively high,such as steam turbine impeller blades,propellers,aero engine impeller blades,automobile molds.The quality of these curved parts directly affects the development level of the national machinery industry,Parts are involved in the quality inspection of complex curved surfaces.Testing the quality of complex curved surfaces processed by five-axis involves the geometric error evaluation methods of complex curved surfaces and the factors that affect the geometric errors of curved surfaces.In order to improve the quality of complex curved surfaces,the research on the geometric error evaluation method of complex curved surface parts and the influence of five-axis CNC milling processing parameters has important theoretical significance and economic value.The main research work of the paper is as follows:(1)According to the minimum condition principle of the minimum area method,construct a mathematical model for evaluating the contour error of complex curved surfaces.First,the measured curved surface and the theoretical curved surface are roughly matched,that is,the two curved surfaces are placed in the same coordinate system to reduce the system Error;then use Liao Ping’s segmentation surface approximation algorithm to accurately calculate the shortest distance from the actual measurement point to the theoretical surface;then use differential evolution algorithm,particle swarm method and differential evolution particle swarm hybrid algorithm to affect the six parameters of the location and attitude of the measurement point Variables are optimized to minimize the maximum distance between the measured point set and the theoretical surface,thereby obtaining the contour error value of the complex surface;finally,for experimental verification,the three optimization algorithms are combined with the shortest distance calculation method from the point to the surface to obtain the surface The contour error value is compared,and the superiority of the differential evolution particle swarm hybrid algorithm is obtained.(2)The single-factor orthogonal experiment was carried out on the influence of cutting depth,cutting feed,and machining line spacing on the contour error of complex curved workpieces.The results showed that the cutting depth,cutting feed,and machining line spacing all have an effect on the cutting force.And the profile error value of complex curved surface has a certain impact,the specific impact is as follows: when the cutting depth is small or large,the curved surface profile error value of the curved workpiece will be relatively large,and the quality of the curved surface will also decrease;when the cutting feed The amount of surface contours increases continuously,and the surface contour error value of the corresponding curved surface workpiece is continuously increasing,and the quality of the surface will continue to decrease;when the row spacing value decreases,the surface contour error value of the curved surface workpiece continues to decrease,and the quality of the processed surface Will continue to improve.