JPS63159718A - Method for monitoring internal surface of electric resistance welded tube in manufacture - Google Patents

Abstract

PURPOSE:To directly monitor the internal surface of a steel tube and to improve the quality of a product by running a remotely-controlled monitoring device main body which is controlled to run in the opposite direction from the pipe production in an electric resistance welded tube in the pipe production and stopping it corresponding to an external necessary position, and then collecting information on the shape of an internal bead part, heat treatment temperature, etc., there. CONSTITUTION:The remotely-controlled monitoring device main body 11 is inserted into the electric resistance welded tube P1 which is being manufactured between a sizing stand 9 and a cutting machine 10 from the tip of the electric resistance welded tube in the opposite direction from the pipe production at a faster speed than the tube production. At the same time, an external controller 25, etc., equalize the speed of the main body 11 to the pipe producing speed so that the main body stops at the position of, for example, an external postannealer 7. An information collecting means 19 provided to the main body 11 collects information on the shape of the internal bead part of the steel tube P1, heat treatment temperature, etc., and this information is transmitted to the outside by a transmitter receiver 22 to control, for example, an internal bead cutting device and the annealer 7 according to the information.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for monitoring the inner surface of an electric resistance welded steel pipe during pipe making.

``Prior art'' As shown in Fig. 1, MIA steel pipes are manufactured by continuously forming a steel strip into a base pipe P having a substantially circular cross section using a pipe-making machine stand 1, and forming a joint edge portion on both sides of the formed base pipe P. Pa is heated by the contact tip 2 and the impeder 3, and the joint edge portion Pe of the heated raw pipe P is crimped by the squeeze roll 4. After cutting the inner and outer beads of this crimped welded part with an inner and outer cutting tool 5°6, the crimped welded part was heat treated with a boss annealer 7, cooled with a cooling device 8, and then made into a perfect circle in cross section with a sizing stand 9. The material is formed into a shape, cut into predetermined lengths using a cutting machine 10, and subjected to a finishing process.

In order to produce high-quality ERW steel pipes, all processes in the manufacturing process must be perfect. For example, if the inner bead is improperly cut, the product will have a defective inner bead. An internal bead removal device has been proposed.

For example, as disclosed in Japanese Unexamined Patent Publication No. 52-95389, means for controlling the position of a mandrel bar having an inner bead cutter by providing a position detector in contact with the outer bead and linking with this position detector; Or JP-A-5
As disclosed in Japanese Patent No. 8-122121, there is a means for crushing the inner bead with a pressing roller.

Furthermore, various heat treatment techniques using a boss annealer have been proposed in the past, such as Japanese Patent Application Laid-Open No. 59-1182.
There are a seam tracking method as disclosed in Japanese Patent Publication No. 7518275, and a heat control method as disclosed in Japanese Patent Application Laid-Open No. 51-38439.

"Problems to be Solved by the Invention" By the way, the techniques disclosed in the above-mentioned publications are all for controlling the ERW steel pipe from the outside, and are not capable of controlling the ERW steel pipe directly by grasping the inner surface properties of the ERW steel pipe. It's not something to control.

For example, when cutting an inner bead, the shape of the bead on the inner surface of an ERW steel pipe can be directly observed after the pipe is cut, and even if a defective cutting of the inner bead is discovered at that point, cutting it from the squeeze roll ERW steel pipes with a length of several tens of meters up to the machine end up with defective cutting of the inner bead, and when the seam is heat treated with a boss annealer, the heat input is controlled by measuring the outer surface temperature of the seam. However, the temperature difference between the outer surface and the inner surface changes depending on the thickness of the steel pipe, and there is therefore a risk that the heat treatment of the seam portion may be defective.

The present invention was made in view of the above-mentioned conventional problems, and an object of the present invention is to significantly improve product quality by directly monitoring the inner surface of an electric tube.

"Means for Solving the Problems" The present invention has been made to solve the above-mentioned conventional problems, and its gist is to provide an electric resistance welded steel pipe in an electric resistance welded steel pipe during pipe manufacturing. The main body of the remote control monitoring device, which is controlled to run in the opposite direction to the pipe-making direction, is moved and stopped at a required external position, and the electricity at this stationary position is
During pipe manufacturing, the information such as the shape of the inner bead of the steel pipe and the heat treatment temperature of the inner bead portion is collected by an information collecting means provided in the main body of the monitoring device, and the collected information is transmitted to the outside. This method is for monitoring the inner surface of ERW steel pipes.

``Operation'' The remote control monitoring device is placed at an intermediate position between the sizing stand and the cutting machine, and is moved at the required speed from the tip of the ERW steel pipe to the inside thereof, in the opposite direction to the pipe forming direction. At the same time, the speed of the monitoring device is set to match the pipe forming speed so that it is stationary at an external, for example, a boss annealer position, and at this stationary position, the electric current is Information such as the shape of the inner bead of the AM tube and the heat treatment temperature of the inner bead portion is collected by an information collecting means provided in the main body of the monitoring device, the collected information is transmitted to the outside, and based on the transmitted information, for example, Controls the inner bead cutting device 11 and the boss annealer.

[Example] Next, an example of the present invention will be described below based on FIGS. 2 to 4.

In FIGS. 2 to 4, reference numeral 11 denotes a cylindrical remote control monitoring device that is inserted into the ERW steel pipe P+ during pipe making and is controlled to travel in the opposite direction to the pipe forming direction of the ERW steel pipe P1. This is the main body, and on both sides of the lower center of this monitoring device main body iI,
Wheels 13 that are rotationally driven by a motor 12 are provided.

Furthermore, guide rollers 15 are provided on both sides of the lower front and rear of the monitoring device main body 11, and are resiliently brought into contact with the inner surface of the electric resistance welded steel pipe PL by a spring 14.

Further, on both sides of the upper center of the monitoring device body 11, guide rollers 17 are provided which are brought into contact with the inner surface of the electric tube P+ by means of a fluid pressure cylinder 16.

On the longitudinal center line of the upper part of the monitoring device main body 11
- An industrial television camera, a temperature detector, etc., which are positioned by the fluid pressure cylinder 18 and collect information such as the shape of the inner bead of the ERW steel pipe P+ and the heat treatment temperature of the inner bead portion, are installed in the front position of -. Information gathering means 19 is provided.

The information signals collected by the information collecting means 19, such as the shape of the inner bead and the heat treatment temperature of the inner bead portion, are processed by an information processing calculator 20 provided in the monitoring device main body 11, and sent to a transmitting/receiving converter 21. is transmitted from the transceiver 22 to the outside via the transceiver 22, received by the external transceiver 23, inputted to the control 1525 via the transceiver converter 824, and via the controller 25, the inner bead is cut based on the t# information. ~1 Controls equipment and boss annealer.

A distance measurement sensor 26 is provided on the rear end surface (downstream (Ill)) of the monitoring device main body 11, and an external position facing the distance measurement sensor 26, for example, a position downstream of the cutting machine 10 in FIG. is provided with a position control reference plate 27, the distance measurement sensor 26 measures the distance between the distance measurement sensor 26 and the position control reference plate 27, and the information processing calculation is performed via the distance signal converter 28. input to the device 20.

On the other hand, a position instruction signal for the monitoring device main body 11 from the external controller 25 is transmitted from the external transmitter/receiver 23 to the transmitter/receiver 22 on the monitoring device main body 11 side, and is also input to the information processing calculator 20 to indicate the position. The instruction signal and the distance measurement signal are compared and calculated, and the motor 12 is driven via the motor drive controller 29 until the position indication fd and the distance measurement signal match, and the monitoring device main body 11 is powered on. ERW steel pipe PI at a speed faster than the pipe manufacturing speed of ERW steel pipe P+
The tube is then caused to travel in the upward direction, and when it travels to a predetermined designated position, it is controlled to a speed equal to the pipe-forming speed and comes to rest at the predetermined designated position.

Although the above embodiments involve wireless remote control and monitoring, wired remote control and monitoring may also be used.

"Effects of the Invention" As described above, according to the present invention, information such as the shape of the inner bead and the heat treatment temperature of the inner bead portion of the ERW steel pipe being manufactured is directly and continuously collected and transmitted to the outside. Since the information can be transmitted, the internal bead cutting device, the boss annealer, etc. can be properly controlled based on the transmitted information, and this can significantly contribute to improving the quality of ERW steel pipes.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram showing the production line for ERW steel pipes, Figure 2
The figure is a side view showing an embodiment of the present invention, FIG. 3 is a rear end view of the same, and FIG. 4 is a block diagram. l...Pipe making machine stand, 2...Contact tip,
3... Impeder, 4... Squeeze roll, 5,
6... Internal and external part-time job, 7... Boss annealer-58
...Cooling device, 9...Sizing stand, 10.
... Cutting machine, 11 ... Monitoring device main body, 12 ... Motor, 13 ... Wheels, 14 ... Spring, 15 ...
...Guide roller, 16...Fluid pressure cylinder, 1
7... Guide roller, 19... Information gathering means, 2
1... Information processing calculator, 21... Transmission/reception converter, 2
2... Transmitter/receiver, 23... External transceiver, 24.
・・External transmitting/receiving converter, 25 ・・External controller, 2
6...Distance measurement sensor, 27...External position control reference plate, 2nd...Distance signal liquid meter, 29...Motor drive controller, Pl...Erw welded steel pipe Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] The main body of the remote control monitoring device, which is controlled to travel in the direction opposite to the direction of pipe forming of the ERW steel pipe, is moved inside the ERW steel pipe during pipe making, and is stopped at a desired position outside. Information such as the shape of the inner bead of the electric resistance welded steel pipe and the heat treatment temperature of the inner bead portion is collected by an information collecting means provided in the main body of the monitoring device, and the collected information is transmitted to the outside. A method for monitoring the inner surface of an ERW steel pipe inside a pipe.