Development of an outer diameter measuring system that meets the accuracy of steel pipes for pipelines
For the requirements of the outer diameter accuracy of hot-rolled steel pipes, the current national standard GB 3087-82, GB 5310-95, GB 8163-87 and American standard ASTM A 53-93a are greater than or equal to ±1.0% of the nominal outer diameter of the steel pipe.
The ellipticity of the hot rolled steel pipe (ellipticity = (Dmax - Dmin) / Dm, Dmax, Dmin - the maximum and minimum outer diameter of the same section of the steel pipe, Dm - the nominal outer diameter of the steel pipe) is generally 0.5%. For hot-rolled tubes produced in large quantities, it is obvious that the average outer diameter is controlled within the acceptable range and the ellipticity is controlled within 0.5%.
The steel pipe for pipelines requires both the outer diameter and the elliptical dimension of the steel pipe. To achieve high-precision control, high-precision measurement is indispensable, and on-line inspection will become the basis of high-precision control.
For the measurement of steel pipes for pipelines, this paper introduces the equipment for measuring the outer diameter of large-diameter steel pipes. It can measure the outer diameter automatically by non-contact measurement method. It has high measurement accuracy, large measurement range but adjustable, and strong anti-interference ability on site. It has no defects in steel pipe and can measure high temperature steel pipe. It can be applied to the inspection of outer diameter of pipes of various materials and specifications.
The full inspection of the large diameter caliper, rather than the sampling method, has a decisive influence on the control of the steel pipe. These parameters are directly measured by the large diameter caliper and transmitted to the display on the real-time display and real-time sound and light alarms, which play a key role in the production of high precision for changing production status.
There are two ways to measure the ellipticity:
1. The steel pipe in production is in a rotating state, and the elliptic dimension can be measured by a set of probes.
Second, the steel pipe in production is not rotated, and the same section is measured by two sets of probes, and the ellipticity dimension is calculated.
The large diameter caliper can perform high-precision on-line inspection, and display the most basic outer diameter value and ellipticity value on the display. The display of the measured values ​​is the same:
First, the industrial computer displays.
Second, the display on the external display.
The large-diameter caliper achieves real-time on-line inspection of the outer diameter. It can continuously measure the outer diameter of the hot-rolled and cold-rolled steel tubes. The caliper can achieve high-precision measurement, alarm, display and storage. Such functions; for different specifications of steel pipe, it is convenient to adjust the measurement range, and achieve high-precision measurement of 0.05mm by calibration gauge calibration (the measurement accuracy of large diameter caliper can be better than 0.05mm).
Conclusion
The large diameter caliper effectively solves the problems of high temperature, high speed, material, range, electromagnetic interference, etc. The large diameter caliper has a variable range and can be tested for all steel pipes in production. The large diameter caliper is economical and practical in general, easy to use, and can display the test data in real time and analyze the measurement data. Conducive to the control of steel pipe production, has an important impact on the real-time control of the staff.
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