For many years, on-line inspection of the diameter of round products has been standard practice in production processes such as extrusion, galvanizing, and wire drawing. In most cases, a caliper or a camera with a computer-controlled display is used with a typical measurement tolerance of a few microns. These instruments are increasingly being used in finishing operations such as center less polishing of bars, trimming, and the like.
However, in the production of hot rolled pipes, these instruments are used relatively rarely because of the harsh environment and large diameter. The purpose of this paper is to illustrate the detection of the outer diameter of the steel pipe under the above-mentioned environment and through the online communication function with the host computer, to input the measurement data in real time for the control system to achieve control, and the caliper is used in the seamless steel pipe manufacturer and supplier. And used very successfully.
A steel pipe made of a single piece of metal with no seams on its surface is called a seamless steel pipe. According to the production method, the seamless pipe is divided into a hot rolled pipe, a cold rolled pipe, a cold drawn pipe, an extruded pipe, a top pipe, and the like. The maximum diameter is 650mm and the minimum diameter is 0.3mm.
Obviously, if a system can measure the outer diameter and wall thickness simultaneously, this would be an ideal system. However, from the working principle of the current generation of instruments, it is not feasible to measure products with tight tolerances. Therefore, this paper mainly introduces the on-line measurement of the outer diameter and the off-line detection of wall thickness, outer diameter and inner diameter.
Problems encountered in seamless steel pipes
Accurate measurement of the outer diameter of the seamless steel pipes under actual production conditions is not an easy task. Production conditions are:
High temperature, typical temperature is 700 ° C ~ 1100 ° C or higher
High speed
Have radial displacement and vibration
The pipe end is deformed
Have iron oxide skin
Steam and smoke
There are splashes
The measuring instrument is subjected to shock and vibration
Therefore, the problem faced by the in-line measurement system is that the measurement is performed reliably, accurately, and stably within a tolerance of a few hundredths of a millimeter (0.01 mm). The most important thing is to maintain this performance in continuous production month after month, year after year.
Therefore, the problem faced by the in-line measurement system is that the measurement is performed reliably, accurately, and stably within a tolerance of a few hundredths of a millimeter (0.01 mm). The most important thing is to maintain this performance in continuous production month after month, year after year.
Therefore, the problem faced by the in-line measurement system is that the measurement is performed reliably, accurately, and stably within a tolerance of a few hundredths of a millimeter (0.01 mm). The most important thing is to maintain this performance in continuous production month after month, year after year.
