Non-contact measurement method for thermal state sizes of forgings

Abstract

The invention relates to a non-contact measurement method for thermal state sizes of forgings, in particular to a method for measuring the sizes of the forgings by using strip structured light, and belongs to the field of high-temperature forging size measurement,. The method comprises the following steps of: dividing the forgings into a square class and a cylindrical class, then calibrating internal and external parameters of a first CCD camera and a second CCD camera, and building a coordinate relation of the cameras and an external viewing field; projecting the strip structured light to the high-temperature forgings; acquiring images of the high-temperature forgings projected by the strip structured light by an image acquisition system; processing the acquired images; quickly extracting feature points of the associated forging size by analyzing shape characteristics of the edge of the structured light on the cylindrical and the square forgings; combining calibration results of the first CCD camera and the second CCD camera to carry out three-dimensional modeling on the feature points of the forgings; and calculating the forging size and partial form and position errors of the forgings. The method adopts the binocular vision technology to shoot the images of the high-temperature forgings in real time, is quick and accurate in measurement, and can meet the requirements of industrial forging and stamping production.

Description

technical field [0001] The invention belongs to the field of dimension measurement of high-temperature forgings, in particular to a method for measuring dimensions of forgings using strip structured light. Background technique [0002] In the forging production, it is necessary to measure the size of the forging, and it is extremely difficult to measure the size due to the influence of the temperature of the forging. The existing measurement methods are mainly direct contact measurements such as manual calipers and measuring rods. Due to high temperature, harsh working conditions, and large errors in direct contact measurement, in the actual production process, the method of increasing the machining allowance of forgings is usually used to ensure the final forging size, which leads to waste of blank materials. In addition, in the case of partial measurement, the forging must be off-line and unloaded from some auxiliary tools, which increases the measurement time and has a c...

AI Technical Summary

Problems solved by technology

[0006] The main problem to be solved by the present invention is to overcome the defects of large amount of information collection and slow data processing speed of non-linear measurement of forgings in the past, which cannot meet the real-time measurement of industrial forging production. The spatial model of the high-temperature forging is established based on the feature points of the high-temperature forging, and then the size of the high-temperature forging is calculated to provide a size reference for the next step of forging

Images