Research On Online Measurement Technology Based On Open CNC System

There are still a lot of the work of the production process is relatively backward in modern industrial production such as large aircraft simple structure. These artifacts are the first preform obtained by forging or casting and other methods,the positioning of the CNC machining process is more difficult,and the measurement accuracy and efficiency are relatively low.Aiming at this problem, first of all, in order to improve efficiency and ensure accuracy measurement, research measuring path planning based on the geometric characteristics of the part geometry characteristics classification and selection, planning the measurement path corresponding features, and design an appropriate survey subroutine. Secondly, for the processing of the measurement data to study the precise positioning of key technologies designed touch probe calibrated mathematical model, using contact measurement to obtain measurement data by the least squares method with a margin constraint on the measurement data fitting, calculate the characteristic center and a rotation angle of the workpiece, thus ensuring a uniform margin in case of accurate positioning of the workpiece alignment, and analyzes the positioning error online measurement. Then, the HNC-848 numerical control system was developed to measure the module of the development platform, and the visualization function of the measurement data was realized, so that the user can use the G68 command to adjust the coordinate system. Finally, for specific parts of machining center on-line measurement and verified by the experiment. The experimental results show that the measurement system is very good solve the large aircraft has the advantages of simple structure a location to find is low efficiency and poor precision problems.