The wire caliper has been applied to high-speed wire for many years. Its method of use is mainly used for dimension inspection during rolling. The wire caliper is used to detect the outer diameter of the high-speed wire. The adjustment is adjusted according to the display data. Achieve the purpose of controlling dimensional accuracy. The wire caliper can be used for high-precision inspection of the outer diameter of hot rolling and cold rolling. In addition to the basic outer diameter detection function, the wire caliper also has an analysis function to display head and tail defects.
1, the working principle of the caliper
An optical image is formed by the optical system to form an electronic image on the line CCD of the receiving lens, and the outer shape of the object corresponding to the parallel beam is obtained by image processing.
The advantage of this measurement method is that there are no mechanical moving parts and there is no error caused by wear. It uses an electronic camera to capture the shadow of the beam at the same time. The measuring vehicle of the wire caliper photographed the projection of the same cross section synchronously at a speed of 500 times/second by eight equally spaced photoelectric imaging devices. The projection size data taken in 8 directions is sent to a special industrial computer at a very high sampling rate, and the measured data is analyzed and processed. The outer diameter data of 8 directions is composed of 16 spatial points of equal spacing on the circumference. .
The outer diameter measurement is performed on 16 measuring points arranged at equal intervals in the circumference, and the arc formed between the measuring points becomes an "insensitive area" of the measurement because the image formed by the projection is not obtained. Since the measuring point spacing is only 22.5° arc, the most "insensitive" position of the measuring instrument projection is at 11.25°. It can be known from simple geometric operations that as long as there is a protrusion with a diameter of 1% or more, the projection is to be obscured by the projection of the adjacent two directions, and the difference between the projection data and the direct outer diameter projection is smaller than 1%, time, same section measurement and slight twisting of the measured object, the instrument can quickly find product defects and dimensional fluctuations, and find the process problems in production in real time.
2, the use of wire caliper
The wire caliper is used in the main control room for the industrial computer and data acquisition. It is convenient for the operator to set the parameters and observe the real-time circle size in time. When the size is out of tolerance or the ellipticity is out of tolerance, the wire caliper starts to alarm. The first road? The eighth road data turns red, and the road turns red to indicate which road size is out of tolerance.
The external display uses the display to display data, which is hopped 2 or 3 times per second to display the measured size in time. The wire caliper processes the size data collected every second, and finds the average value displayed on the industrial computer screen and the external display. The external display shows the maximum and minimum values, ellipticity and operating status. The industrial computer display shows the measured value, maximum value, minimum value, average value and ellipticity of each channel.
In addition to detecting local over-difference points, the wire caliper also has an analysis system. The cross-sectional view can reflect the overall appearance of the cross-sectional dimension. The trend picture can reflect the overall appearance of the entire wire rod and the condition of the tolerance. In addition, the displayed product model, nominal value, allowable positive tolerance, allowable negative tolerance, etc. are all convenient to compare with the measured actual value. At the same time, the history query function can view the above status, which can be accurate to the second, and can also export historical data (in Excel form). The setting of the thermal expansion coefficient also allows the worker to obtain the cold temperature of the high speed wire.
3. Analysis of head and tail defects
The wire caliper displays an analysis system diagram of the wave pattern and the defect map.
The fluctuation diagram is mainly used to check the dimensional fluctuation of the rolled material to be tested. From the figure, the change trend of the outer diameter of the whole rolled material can be seen, and the fluctuation of the moment can also be checked.
The defect map can observe the type of out-of-tolerance of the eight-way measurement value, such as the above-mentioned tolerance, the lower tolerance, and the ellipticity. Through the defect analysis function, we can obtain the rolling defect distribution of the wire and bar in the rolling scene very vividly and timely, especially the head and tail defect characteristics of the rolled material, and the length of the continuation, so as to adjust the rolling moderately. Process configuration.
Through the above, the defects of the head and tail can be analyzed, so that the overall information of the high speed wire can be obtained more accurately.
Conclusion
Wire caliper is an outer diameter testing equipment specially developed for high-speed wire and other rolled steel products. It has an analysis function, systematically analyzes the measured steel size, and thus obtains the overall state of steel production, and can also perform good head and tail defects. The analysis makes it easier for the staff to grasp the high-speed wire and adjust it to the best production state.
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