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introduction
In the bar production of the metallurgical industry, rebar is a special-shaped steel with a large production quantity and a large number of users. In order to reduce the cost, increase the yield, reduce the waste caused by the dimensional error, and make the rolling stock size in the negative deviation area. This requires continuous non-contact on-line measurement of the rolled stock. An image detection system based on an area array CCD can simultaneously give multiple parameters of the rebar.
1, test data
Rebar is a three-dimensional object with complex shapes and many detection parameters. The rebar caliper mainly detects three dimensions of the rebar section: base circle diameter D0, transverse rib or rebar spiral maximum diameter D1, rebar longitudinal rib or anchor The width dimension B of the non-helical portion.
2, detection method
This paper mainly introduces two detection methods, one is image method and the other is photoelectric method. Both of these measurement methods are online non-destructive testing equipment, which can accurately detect the tested rebar.
2.1, photoelectric method
In order to accurately obtain the size of the wire diameter rebar, the photoelectric method uses eight sets of probes to realize the detection of the rebar. The distance between the eight sets of probes is 22.5°. The built-in probe of the rebar caliper is related to the diameter of the rolled material. Raw data, and upload data to the host computer through the communication device. The rebar caliper is mainly composed of the probe part, the main disc part, the over-steel part, the outer casing part and the circuit system.
Photoelectric rebar diameter measurement can be used not only for the detection of rebar inner diameter, transverse ribs, longitudinal ribs, cross-sectional area, etc., but also with a software system to measure the diameter and ovality of the round steel.
Photoelectric method Rebar diameter measurement frequency is 500Hz, high-speed detection, and can be applied to the size inspection of hot-rolled rebar, equipped with cooling and dustproof system to ensure the normal operation of the rebar caliper.
2.2, image method
Image method Rebar diameter measurement is mainly to take a clear picture with an industrial camera, and to process the picture through the caliper to obtain the specific size information of the rebar.
When working with the image rebar caliper, the industrial camera will take a section of the rebar image as shown below. Through the digitization of the image, we can analyze and calculate the following dimensions indicated in the figure: the base circle diameter D0, the spiral outer circle diameter D1, the one-sided tooth height h1, h2, the spiral pitch P and the tooth width a . In addition, the width dimension B of the longitudinal rib portion can be measured by a camera perpendicular to the photographing angle.
The image method rebar diameter measurement uses multiple industrial cameras to continuously take pictures, and the pictures taken can be clearly seen on the software system, so that the steel process can be detected. The following figure is a software system diagram using a bolt as an example. Compared with the traditional photoelectric caliper and laser caliper measured by linear CCD imaging, the advantage is that it can accurately analyze the continuous section of the rolled material, especially suitable for measuring the complex shape of the rolled material.
Conclusion
The rebar diameter measurement adopts the on-line measurement method, which can obtain the wire diameter size more accurately and timely, so as to remind the staff in time to adjust the rolling state in time to obtain better quality rebar.
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