Detection method for identifying water drops in seamless steel tube outer surface three-dimensional detection

Abstract

The invention relates to the technical field of three-dimensional detection of the outer surface of a steel pipe, in particular to a detection method for identifying water drops in three-dimensional detection of the outer surface of a seamless steel pipe. The detection method comprises data preprocessing, model training and online detection. According to the method, the seamless steel pipe is detected through three steps of data preprocessing, model training and online detection, in actual production, the three-dimensional laser sensor splices contour lines of a pipe body and converts the contour lines into a to-be-detected steel pipe surface depth map, and a water drop detection model is used for detecting the depth map; according to the method, morphological operation and out-of-region search are carried out on the depth image to obtain the to-be-detected region suspected to be water drops, and then a convolutional neural network is used for identifying the to-be-detected region, sothat the water drops on the surface of the steel pipe can be accurately identified, the steel pipe three-dimensional detection false alarm is greatly reduced, the detection time is short, and the method is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of three-dimensional detection of the outer surface of a steel pipe, in particular to a detection method for identifying water droplets in the nondestructive detection of the outer surface of a seamless steel pipe. Background technique [0002] Hot-rolled seamless steel pipes need to be sprayed and cooled during the production process, especially when passing through ultrasonic testing equipment, water needs to be sprayed as a couplant, resulting in sometimes water droplets on the surface of the pipe body. When the three-dimensional sensor is used to collect the profile data of the pipe body, the water droplets appear as depressions, protrusions, and both depressions and protrusions on the depth map. The shape is mainly oval in the center with horizontal stripes on both sides. Different steel pipes have changeable shapes on the surface, which is easy to be confused with real defects, which seriously interfer...

AI Technical Summary

Problems solved by technology

When the three-dimensional sensor is used to collect the profile data of the pipe body, the water droplets appear as depressions, protrusions, and both depressions and protrusions on the depth map. The shape is mainly oval in the center with horizontal stripes on both sides. The surface of different steel pipes has a changeable shape, which is easy to be confused with real defects, which seriously interferes with the detection and leads to frequent false alarms of the detection equipment.

At present, there is no detection method for identifying water droplets with high accuracy. Therefore, in view of the above problems, a detection method for identifying water droplets in the three-dimensional inspection of the outer surface of seamless steel pipes is proposed.

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