On-line detection method for diameter size of shaft disc type part

Abstract

The invention relates to an on-line detection method for diameter size of a shaft disc type part, and belongs to the technical field of image measurement, which can detect variation in the diameter size during processing of the shaft disc type part in real time and guarantee higher detection efficiency and measurement accuracy. The method comprises the following steps of: calibrating internal parameters of a charge coupled device (CCD) video camera and correcting distortion of an image caused by lens distortion based on a CCD video camera plane calibration method; calibrating external parameters of the CCD video camera, acquiring the image of the shaft disc type part with a known diameter by using the CCD video camera, extracting two edges of the part from the image by a subpixel edge detection algorithm, and calibrating to acquire external parameters of the part relative to the CCD video camera by using coordinates of the subpixel edges and the acquired internal parameters of the camera video; and finally, measuring, acquiring the image of the detected shaft disc type part by using the CCD video camera, extracting the subpixel edges of the part and calibrating to acquire the internal parameters and the external parameters so as to solve the diameter size of the detected part.

Description

technical field [0001] The invention belongs to the technical field of image measurement. Background technique [0002] The shaft is an important part of the machine. It supports the rotation of other rotating parts and transmits torque, and is connected with the frame through bearings at the same time. All the parts on the shaft rotate around the axis line, forming a combination based on the shaft - shafting components. Shaft parts are the most widely used parts in various mechanical devices. With the advancement of technology, the precision and speed of mechanical devices are required to be higher and higher. During the machining process, shaft parts are often processed with high precision . [0003] At present, the accuracy control of shaft parts is guaranteed by the accuracy of the CNC machine tool itself, and the CNC machine tool uses the computer to control the movement of the worktable to ensure the machining dimensional accuracy. However, after the machine tool ha...

AI Technical Summary

Problems solved by technology

2. Using two (or more) cameras to measure the shaft, data fusion of multiple images, and fixed precision of the cameras will all affect the final measurement results

However, due to the information fusion of multiple images and the spatial position calibration of multiple cameras, it not only increases the difficulty of measurement work, but also brings high costs.

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