JPH07232211A - Method for tracking weld point in continuous manufacturing equipment for electric resistance welded tube and manufacturing equipment for electric resistance welded tube - Google Patents

Abstract

PURPOSE:To improve the accuracy of the cutting length of a weld zone not-using tube by executing tracking by detecting the position of the weld point of a band steel with a non- contacting type weld point detecting sensor and calculating the position by the number of revolution of the roller which contacts with the band steel. CONSTITUTION:The tip of the coil 1 of band steel which is un-coiled from an un-coiler and the tail end of the preceding coil 1 of band steel are welded with a welder 2. The position of the weld point of the welded band steel 4 is detected with a weld point detecting sensor 13. The feed rate of the band steel 4 is measured with a pulse generator connected with pinch rolls 3. The band steel 4 is formed into an electric resistance welded tube manufacturing parts 7, 8, 9, and made into a standard length catting tube by cutting off with a standard- length cutting machine 11. The not-using tube is made by cutting off the weld zone including the weld point with the standard-length cutting machine 11. When the weld point is detected with the weld point detecting sensor 13, the feed rate of the band steel 4 is transmitted to a controller, calculated and the cutting machine 11 is operated when the cutting machine 11 reaches a prescribed position. In this way, the artificial misoperation by an operator is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tracking of welding points of steel strips and electric resistance welded pipes continuously welded in continuous electric resistance welded pipe manufacturing equipment (tracking of welding points), and more particularly to non-contact type The present invention relates to a welding point tracking method and a continuous electric resistance welding pipe manufacturing facility for continuous electric resistance welding pipe manufacturing equipment capable of detecting a welding point with a welding point detection sensor and performing welding point tracking of a strip steel and an electric resistance welding pipe.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing the overall construction of a conventional continuous electric resistance welded pipe manufacturing facility. It is a welding machine 2 for welding the steel strip coil 1 starting from the unwinding of the steel strip coil 1. Forming machine 7 for continuously pipe forming 4, ERW machine 8 for welding seams of strip steel 4 formed by pipe, Sizing machine 9 for forming ERW pipe sewn by ERW machine 8, and 1 is an example of a series of equipment including a constant length cutting machine 11 for cutting an electric resistance welded pipe into a predetermined length.

The strip steel coil 1 unwound from the unwinder is welded by the welding machine 2 to the tail end of the preceding strip steel coil and the tip of the succeeding strip steel coil. Conventionally, in the equipment other than the continuous electric resistance welded pipe manufacturing equipment, the welding point (weld part) of the strip steel 4 welded is detected by the light transmission method in which the position where the strip steel plate is drilled is installed on the exit side of the welding machine 2. It was attempted to detect with the sensor of.

[0004]

In the welding point detection by the light transmission method shown in the prior art, it is possible to detect the welding point before the strip steel is formed into a round pipe or a square pipe. There was a problem that the welding point could not be detected because the light passage hole was closed after the pipe. Therefore, in the continuous electric resistance welded pipe manufacturing equipment, it was necessary to manually cut the standard length pipe and the pipe not using the weld and set the position of each operating device. For the above reasons, in the fixed length pipe cutting, the cutting of the pipe not used for welding, the position setting of each operating device, etc., the welding point which is the seam of the strip steel 4 is the forming machine 7, the electric sewing machine 8, the sizing machine 9, the fixed length cutting. It has been attempted to arrange personnel manually before passing through each device such as the machine 11.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a welding point tracking method for continuous ERW pipe manufacturing equipment and a continuous ERW pipe manufacturing apparatus in which a preceding steel strip and a subsequent steel strip are used. It is an object of the present invention to provide a welding point tracking method for a continuous electric resistance welded pipe manufacturing equipment and a continuous electric resistance welded pipe manufacturing equipment capable of accurately tracking a welding point of steel.

[0006]

In order to achieve the above object, in the present invention, a welding machine for welding a trailing end portion of a leading strip steel and a leading end portion of a trailing strip steel, and a continuous welding of the strip steel. Forming machine for pipe forming, ERW machine for welding seams of pipe made from steel, Sizing machine for forming ERW pipe,
A continuous electric resistance welded pipe manufacturing facility composed of a constant length cutting machine for cutting the electric resistance welded pipe into a predetermined length, the continuous electric resistance welded pipe tracking a welding point of the strip steel welded by the welding machine. In a welding point tracking method for manufacturing equipment, the welding point of the strip steel is tracked by detecting the position of the welding point by a non-contact type welding point detection sensor, and the welding point by the rotation speed of a roller in contact with the strip steel. The tracking is performed based on the combination with the position calculation of.

Further, in order to achieve the above object, in the present invention, a welding machine for welding the trailing end portion of the preceding strip steel and the leading end portion of the following strip steel, and the strip steel are continuously pipe-formed. Forming machine, ERW machine for welding seams of pipe steel, Sizing machine for forming ERW pipe, and fixed length cutting machine for cutting the ERW pipe to a predetermined length In a continuous electric resistance welded pipe manufacturing facility comprising a non-contact type welding point detection sensor and a roller that is in contact with the strip steel are arranged in the continuous electric resistance welded pipe manufacturing facility, and the welding point by the non-contact welding point detection sensor is arranged. The tracking is performed based on a combination of the detection of the position of No. 1 and the calculation of the position of the welding point based on the rotation speed of the roller contacting the strip steel.

[0008]

In the past, personnel (operator) marked the band steel welding point with paint or the like and visually tracked the welding point. Therefore, an artificial operation error occurs and accurate welding point tracking cannot be performed.

In the present invention, the tracking of the welding point of the strip steel is performed by combining the detection of the position of the welding point by the non-contact type welding point detection sensor and the calculation of the position of the welding point by the rotation speed of the roller contacting the strip steel. Welding point tracking method for continuous electric resistance welded pipe manufacturing equipment that can eliminate human error by performing tracking based on the following, and can accurately track the welding point of the preceding steel strip and the following steel strip. And continuous ERW pipe manufacturing equipment.

In addition, since it is possible to accurately track the welding point of the preceding strip steel and the following strip steel, it is possible to improve the accuracy of the fixed-length pipe cutting length of products, the pipe-cutting length not using the welded portion, the forming machine, and the electric resistance welding. It is possible to automate the operation of machines such as machines, sizing machines, and standard length cutting machines.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall view of a continuous electric resistance welded pipe manufacturing facility which is an embodiment of the present invention.

The strip steel coil 1 unwound from the unwinder is welded by the welding machine 2 to the tail end of the preceding strip steel coil 1 and the tip of the succeeding strip steel coil 1. The position of the welding point (welded portion) of the welded strip steel 4 is detected by the welding point detection sensor 13 installed on the exit side of the welding machine 2. The feed amount of the strip steel 4 is measured by a pulse generator (not shown) connected to the pinch roller 3, and the position of the welding point of the strip steel 4 is tracked (tracked). The steel strip 4 passes through the pinch roller 3, the steel strip storage wheel 5, and the roller 6 to form an electric resistance welded pipe by a forming machine 7, an electric resistance welder 8, and a sizing machine 9 which are the electric resistance welded pipe manufacturing section. The formed electric resistance welded pipe becomes the pre-cutting pipe 10 and is cut by the fixed length cutting machine 11 to become the fixed length cutting pipe 12. Also, the welded portion including the welding point is cut by the constant length cutting machine 11 as an unused pipe.

FIG. 2 illustrates tracking of the position of the welding point by the welding point detection sensor 13 and the pinch roller 3 installed on the exit side of the welding machine 2 described in FIG. In FIG. 1, the position of the welding point of the strip steel 4 is tracked by using the pinch roller 3, but the position is not limited to the pinch roller 3 and other pin steel rollers 4 can be contacted and rotated. Any roller will do.

In FIG. 2, the welding point detecting sensor 1 is shown.
Welding point 14 of strip steel 4 by combination of 3 and measuring roller 18
The position of is tracked.

The method for detecting the welding point 14 of the steel strip 4 is as follows.
The saturation (brightness) of the base material and the surface of the welding point 14 is detected by the welding point detection sensor 13. When the signal from the welding point detection sensor 13 is equal to or higher than the saturation (brightness) level preset in the controller 15, the controller 15 transmits the welding point detection output to the controller 17.

On the other hand, the pulse generator 19 connected to the length-measuring roller 18 transmits the number of rotations of the roller to the controller 17 via the wiring 20.

In this way, the feed amount of the strip steel 4 or the electric resistance welded pipe is calculated by the controller 17 from the roller rotation speed of the length measuring roller 18 and the roller diameter. That is, the welding point detection sensor 13
When the signal from is transmitted to the control device 17 via the controller 15, counting of the feed amount of the steel strip 4 and the electric resistance welded pipe is started to perform welding point tracking.

Here, a method of calculating the feed amount of the strip steel or the electric resistance welded pipe from the roller rotation speed and the roller diameter of the length measuring roller 18 will be briefly described with reference to FIG.

Assuming that the roller diameter of the length measuring roller 18 is d ₁ and the number of rotations of the length measuring roller 18 is n, the feed amount of the strip steel = roller diameter (d ₁ ) × π × rotation number (n) (1) Is calculated by.

For example, in FIG. 3, the distance from the detection sensor 13 to the electric sewing machine 8 is l ₂ + l ₃ + l ₄ , and the above (1)
Is 1 ₂ + l ₃ + l ₄ , the welding point 14 is at the position of the electric sewing machine 8.

When the steel strip 4 is moving in the electric resistance welded pipe manufacturing facility, if the equipment for measuring the feed amount, for example, the length measuring roller 18 has a large friction when rotating, the steel strip 4 and the length measuring roller 18 There may be a case where an error occurs in the accuracy of welding point tracking due to the occurrence of slip between the contact surfaces with and. The length measuring roller 18 is light and has little friction, and the accuracy of welding point tracking can be improved. The length measuring roller 18 is a small diameter steel roller having a weight of about 30 kg and a roller diameter of about 100 mm or a synthetic resin roller. When the existing pinch roller is used instead of the length measuring roller 18, the weight of the pinch roller is about 500.
There is a large diameter steel roller with a weight of 100 kg and a roller diameter of about 100 mm.

Further, by arranging a length measuring roller or a pinch roller on the exit side of the welding machine 2 to reduce slip with the strip steel 4, the accuracy of welding point tracking can be improved.

Further, as shown in FIG. 1, by installing the welding point detecting sensor 13 separately from the welding point detecting sensor 13 just before the forming machine 7 or the fixed length cutting machine 11, for example, an error in welding point tracking can be obtained. It is possible to improve the accuracy by improving the cut length of the standard length pipe and the pipe not using the welded portion, and the accuracy of the position setting timing of each device when passing through the electric resistance welded pipe.

Furthermore, since the detection accuracy of the welding point 14 has a great influence on the accuracy of the welding point tracking, it is possible to improve the detection accuracy by marking the welding point 14 and increasing the saturation. For example, as the marking means, there is a marking spray 22 driven by an air cylinder 21 into which compressed air is injected as shown in FIG.
The injection of compressed air is controlled by the solenoid valve 23.

By performing the tracking of the welding point in this manner, the cutting length accuracy of the fixed length pipe and the pipe not using the welded portion can be improved in the continuous electric resistance welded pipe manufacturing facility, and the product yield can be improved. In addition, it is possible to eliminate human erroneous operation, and it is possible to reduce the work amount of personnel (operator).

FIG. 5 is a flow chart of the welding point tracking method of the continuous electric resistance welded pipe manufacturing equipment according to the embodiment of the present invention shown in FIG.

After the welding of the trailing end portion of the preceding strip steel and the leading end portion of the following strip steel is completed, when the strip steel 4 passes through the welding point detection sensor 13, the welding point detection sensor 13 detects the welding point 14. And transmits the signal to the controller 15. Controller 1
5 is a signal (saturation) transmitted from the welding point detection sensor 13
When the signal is equal to or higher than the saturation (brightness) level preset in the controller 15, the welding point detection output is transmitted to the control device 17. On the other hand, the controller 17 receives the roller rotation speed measured by the length measuring roller 18 or the pulse generator 19 connected to the pinch roller 3. When the welding point detection output is transmitted from the controller 15, the control device 17 starts counting the feed amount of the strip steel 4 calculated from the rotation number of the roller to perform the welding point tracking. By tracking the position of the welding point 14, it is possible to output an operation command to each device of the continuous electric resistance welded pipe manufacturing equipment.

[0028]

As described above, according to the present invention, the welding point tracking method and continuous method for the continuous electric resistance welded pipe manufacturing equipment capable of accurately tracking the welding points of the preceding strip steel and the following strip steel. It is possible to provide ERW pipe manufacturing equipment.

As a result, the accuracy of the cut length of the fixed length pipe and the pipe not using the welded portion of the continuous electric resistance welded pipe manufacturing equipment is improved, the product yield is improved, and the human error (operator) is prevented from being erroneously operated. This will lead to a reduction, an increase in production volume, and a reduction in the basic unit of ERW pipe manufacturing, which will be extremely effective in industry.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall view of a continuous electric resistance welded pipe manufacturing facility that is an embodiment of the present invention.

FIG. 2 is a diagram illustrating tracking of a welding point position by a welding point detection sensor and a pinch roller shown in FIG.

FIG. 3 is a diagram for explaining a method of calculating a feed amount of a steel strip or an electric resistance welded pipe.

FIG. 4 is a view showing marking means for marking a welding point.

5 is a diagram showing a flowchart of a welding point tracking method for continuous electric resistance welded pipe manufacturing equipment according to the embodiment of the present invention shown in FIG.

FIG. 6 is a diagram showing an overall schematic view of a conventional continuous electric resistance welded pipe manufacturing facility.

[Explanation of symbols]

1 ... Strip steel coil, 2 ... Welding machine, 3 ... Pinch roller, 4 ...
Strip steel, 5 ... Strip steel storage vehicle, 6 ... Roller, 7 ... Forming machine, 8 ... ERW machine, 9 ... Sizing machine, 10 ... Pre-cutting tube,
11 ... Standard length cutting machine, 12 ... Standard length cutting pipe, 13 ... Welding point detection sensor, 14 ... Welding point, 15 ... Controller, 16,
20 ... Wiring, 17 ... Control device, 18 ... Length measuring roller, 19
… A pulse generator.

Front page continuation (72) Inventor Masazumi Ebine 3-1-1 Sachimachi, Hitachi City, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Hitoshi Chiba 3-1-1, Sachimachi, Hitachi City, Ibaraki Prefecture Hitachi Ltd., Hitachi Works (72) Inventor, Kazuya Sukegawa 3-1-1, Saiwaicho, Hitachi, Ibaraki Prefecture Hitachi Ltd., Hitachi, Ltd. (72) Inventor, Hiroshi Saeki, 3-chome, Saitama, Hitachi, Ibaraki Prefecture No. 1 No. 1 Stock Company Hitachi Ltd. Hitachi factory

Claims (16)

[Claims] 1. A welding machine for welding a trailing end of a preceding steel strip and a leading end of a following steel strip, a forming machine for continuously producing the steel strip, and a forming machine for producing the steel strip. A continuous electric resistance welded pipe manufacturing facility composed of an electric resistance welder for welding seams, a sizing machine for forming an electric resistance welded electric resistance welded pipe, and a standard length cutting machine for cutting the electric resistance welded pipe into a predetermined length. There, in the welding point tracking method of the continuous electric resistance welded pipe manufacturing equipment that tracks the welding point of the strip steel welded by the welding machine, the tracking of the welding point of the strip steel is performed by a non-contact welding point detection sensor. Tracking is performed based on a combination of detection of the position of the welding point and position calculation of the welding point based on the rotation speed of a roller that comes into contact with the strip steel. Method. 2. The welding point tracking method for continuous electric resistance welded pipe manufacturing equipment according to claim 1, wherein the welding point of the strip steel is marked, and the position of the welding point is detected by a non-contact welding point detection sensor. A welding point tracking method for continuous electric resistance welded pipe manufacturing equipment, characterized in that 3. The welding point tracking method for continuous electric resistance welded pipe manufacturing equipment according to claim 1, wherein the roller that comes into contact with the strip steel is a pinch roller that conveys the strip steel downstream. Welding point tracking method for continuous ERW pipe manufacturing equipment. 4. The welding point tracking method for continuous electric resistance welded pipe manufacturing equipment according to claim 1, wherein the roller contacting with the strip steel is a length measuring roller used for calculating the position of the welding point of the strip steel. A welding point tracking method for continuous electric resistance welded pipe manufacturing equipment, which is characterized in that 5. The welding point tracking method for continuous electric resistance welded pipe manufacturing equipment according to claim 1, wherein the non-contact welding point detection sensor is arranged downstream of the welding machine. Welding point tracking method for continuous electric resistance welded pipe manufacturing equipment, characterized in that 6. The welding point tracking method for continuous electric resistance welded pipe manufacturing equipment according to claim 1, wherein a roller that comes into contact with the strip steel is arranged downstream of the welding machine to detect a welding point of the strip steel. A welding point tracking method for continuous electric resistance welded pipe manufacturing equipment characterized by performing tracking. 7. The welding point tracking method for continuous electric resistance welded pipe manufacturing equipment according to claim 1, wherein the non-contact welding point detection sensor and the roller that comes into contact with the strip steel are respectively arranged on the downstream side of the welding machine. Then, the welding point tracking method of the continuous electric resistance welded pipe manufacturing equipment is characterized in that the welding point of the strip steel is tracked. 8. The welding point tracking method for continuous electric resistance welded pipe manufacturing equipment according to claim 1, wherein the non-contact welding point detection sensors are arranged at a plurality of locations in the continuous electric resistance welded pipe manufacturing equipment. Welding point tracking method for continuous electric resistance welded pipe manufacturing equipment, characterized in that the welding point tracking is performed. 9. A welding machine for welding a trailing end of a preceding strip and a leading end of a following strip, a forming machine for continuously producing the strip, and a welding machine for producing the strip. A continuous electric resistance welded pipe manufacturing facility including an electric resistance welding machine for welding seams, a sizing machine for forming an electric resistance welded electric resistance welded pipe, and a constant length cutting machine for cutting the electric resistance welded pipe into a predetermined length. , A non-contact welding point detection sensor and a roller that comes into contact with the strip steel are arranged in the continuous electric resistance welded pipe manufacturing facility, the position of the welding point is detected by the non-contact welding point detection sensor, and the roller comes into contact with the strip steel. A continuous electric resistance welded pipe manufacturing facility, wherein tracking is performed based on a combination with the position calculation of the welding point based on the rotation speed of the roller. 10. The continuous electric resistance welded pipe manufacturing equipment according to claim 9, further comprising marking means for marking a welding point of the strip steel. 11. The continuous electric resistance welded pipe manufacturing equipment according to claim 9, wherein the roller that comes into contact with the steel strip is a pinch roller that conveys the steel strip downstream. production equipment. 12. The continuous electric resistance welded pipe manufacturing equipment according to claim 9, wherein the roller that comes into contact with the strip steel is a length measuring roller used for calculating a position of a welding point of the strip steel. Welding point tracking method for continuous ERW pipe manufacturing equipment. 13. The continuous electric resistance welded pipe manufacturing equipment according to claim 9, wherein the non-contact welding point detection sensor is arranged on the downstream side of the welding machine. 14. The continuous electric resistance welded pipe manufacturing equipment according to claim 9, wherein the roller that comes into contact with the strip steel is arranged on the downstream side of the welding machine. 15. The continuous electric resistance welded pipe manufacturing equipment according to claim 9, wherein the non-contact welding point detection sensor and the roller that comes into contact with the strip steel are arranged downstream of the welding machine, respectively. Continuous ERW pipe manufacturing equipment. 16. The continuous electric resistance welded pipe manufacturing equipment according to claim 9, wherein the non-contact welding point detection sensors are arranged at a plurality of locations in the continuous electric resistance welded pipe manufacturing equipment. production equipment.