Processing comprehensive error modeling method

Abstract

The invention discloses a processing comprehensive error modeling method. The method comprises the following steps of S1, classifying displacement errors, namely classifying the displacement errors for computing respectively; S2, measuring the displacement errors, namely measuring position values of various positions through position sensors distributed at various positions; S3, computing displacement constant errors, namely computing the displacement constant errors through the values measured in the step S2; S4, computing displacement variable errors, namely obtaining the displacement variable errors through modelling, analysis and computation of variable errors; and S5, adding the displacement constant errors and the displacement variable errors to obtain a displacement comprehensive error. According to the method, firstly, the errors are classified, the different kinds of errors are respectively independently computed, and the comprehensive error of a machine tool is obtained through integration, so that the corresponding compensation can be carried out according to the comprehensive error, and thus the machining precision of workpieces is improved.

Description

technical field [0001] The invention relates to data monitoring of machine tool processing, in particular to a modeling method for comprehensive processing errors. Background technique [0002] At present, high-speed cutting can improve the machining efficiency, the surface quality of the workpiece, and controlling the relative orientation of the tool and the workpiece can further improve the cutting efficiency. The following errors are caused in the process of machining parts by high-speed CNC machine tools: 1. Establish a three-dimensional model to obtain the processing path of the part, that is, the relative movement path between the workpiece and the tool. In this process, a complex surface is interpolated and discretized, resulting in The difference between the tool path and the three-dimensional model of the workpiece; 2. The machine tool control system needs to convert the relative movement path of the tool and the workpiece into the control command of the CNC machine...

AI Technical Summary

Problems solved by technology

The following errors are caused in the process of machining parts by high-speed CNC machine tools: 1. Establish a three-dimensional model to obtain the processing path of the part, that is, the relative movement path between the workpiece and the tool. In this process, a complex surface is interpolated and discretized, resulting in The difference between the tool path and the three-dimensional model of the workpiece; 2. The machine tool control system needs to convert the relative movement path of the tool and the workpiece into the control command of the CNC machine tool. This step will cause an approximate error between the tool path and the control command; 3 . Under the control of the machine tool system, in the process of moving and processing the workpiece under the joint coordinate system, the kinematic chain transfer is caused by the transfer of motion between the adjacent axes of the machine tool, resulting in the position and orientation error of the tool; 4. The structure of the machine tool Under the interference of motion and motion transmission error, the quasi-static error of the machine tool in the quasi-static process is caused, and the change and unevenness of the machine tool temperature also cause the thermal error of the machine tool; 5. In the process of high-speed cutting, due to the machine tool table And the relatively fast movement of the workpiece, its acceleration is also very large, resulting in a large vibration of the machine tool structure, which further causes the position and direction error of the tool, and the cutting force in the process causes the deformation of the tool, resulting in the deformation of the workpiece error

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