Device for real-time non-contact measurement and compensation of skin topography error in mirror milling and precise control method for skin thickness

Abstract

The invention discloses a real-time noncontact measurement and compensation device for a mirror image milling processing error of skin shape, and a skin thickness precise control method. The device comprises a noncontact measurement module and a data processing compensation module. The noncontact measurement module comprises two laser displacement sensor heads and a laser displacement sensor controller which collects the measurement data of the two laser displacement sensor heads. The data processing compensation module comprises a built-in coordinate bias module of a machine tool numerical control system, and a data analysis module which carries out the processing of the measurement data and calls the built-in coordinate bias module of the machine tool numerical control system to achievethe automatic compensation of the skin deformation in processing according to a processing result. The device just needs to store the dynamic measurement data between a measurement point and a processing point at one moment, reads data, generates a compensation value, then carries out the processing of the compensation value, releases the store space of the data, is small in stored data size, avoids the processing and fitting of the point cloud data of the whole skin, and greatly reduces the data processing and feedback control time.

Description

technical field [0001] The present invention relates to a device and method for precisely controlling the thickness of mechanical processing, in particular to a device and method for precisely controlling the thickness of mirror image milling, in particular to a device for real-time non-contact measurement and compensation of skin shape errors during mirror image milling And the precise control method of skin thickness. Background technique [0002] Mirror milling technology is a new technology for CNC milling of aircraft skins. The mirror milling system consists of two five-coordinate horizontal machine tools that move synchronously. The main shaft of one of the horizontal machine tools is the processing head, and the milling cutter is installed to process the skin. The main shaft of the other five-axis machine tool is the supporting head, and the supporting column is installed to support the skin. The milling cutter and the supporting column move synchronously on the same ...

AI Technical Summary

Problems solved by technology

[0005] The existing technology has the following disadvantages: due to the large size of the skin and the large amount of measured data, during laser scanning, only limited points are measured to obtain the actual surface point cloud data of the skin, and the data is processed and analyzed. Fitting, forming the actual profile, low precision

In addition, the existing process flow has no actual thickness information before skin milling. Although mirror milling can guarantee equal thickness processing, the support surface is often quite different from the theoretical model.

When ultrasonic thickness measurement is performed online, there will be separation between the support column and the workpiece, resulting in loss of thickness data and inability to perform online compensation

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