Method for measuring diameter and straightness accuracy parameters of seamless round steel pipe

Abstract

The invention relates to a method for measuring the diameter and the straightness accuracy parameters of a seamless round steel pipe. The method includes the steps as follows: accomplishing the calibration of parameters of a multi-linear structured light vision sensor formed by one video camera and multi-line laser projectors; distributing the multi-linear structured light vision sensors on the periphery of the seamless round steel pipe to be tested; respectively controlling the laser projectors to project structured light plane onto the measured section of the seamless round steel pipe by a computer, collecting the images of laser stripes on the surface of the seamless round steel pipe and processing the images of the laser strip by a video camera, and calculating the three-dimensional coordinates of different sections according to a measurement model; determining the elliptical center of each section of the space, realizing the measurement of the straightness accuracy of the seamlessround steel pipe and establishing the dynamic and virtual central axis of the seamless round steel pipe; establishing the reference plane of the dynamic and virtual projection of ellipse of the section of the space; and front projecting the ellipse of the section of the space onto the reference plane of the dynamic and virtual projection, and carrying out the operation of circle fitting on the reference plane, thereby obtaining the section circle of the steel pipe. The method can realize the on-line, real-time, automatic and noncontact measurement of the diameter and the straightness accuracyparameters of the seamless round steel pipe.

Description

technical field [0001] The invention relates to a method for measuring the diameter and straightness parameters of a seamless circular steel pipe. In particular, it relates to a method for measuring the diameter and straightness parameters of a seamless circular steel pipe based on a multi-line structured light vision sensor. Background technique [0002] Seamless circular steel pipe is a widely used steel, such as precision internal for structures, fluid transportation, low, medium and high pressure boilers, ships, high pressure fertilizer equipment, petroleum cracking, gas cylinders, hydraulic props, diesel engines, hydraulic and pneumatic cylinders Cylinders, automobile half shaft casings, etc. For different seamless circular steel pipe products and applications, there are different index parameter requirements. Among them, the conformity of processing parameters such as diameter and straightness of seamless circular steel pipe products with design indicators is a direc...

AI Technical Summary

Problems solved by technology

However, in the application of measuring the geometric parameters of seamless circular steel pipes based on single-line structured light vision sensors, it is necessary to ensure that the structured light plane projected by the laser is perpendicular to the central axis of the seamless circular steel pipe when realizing diameter measurement, which greatly increases system installation, difficulty of debugging

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