JP2000107864A - Flash butt welding method and flash butt welding equipment having spatter removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of times for rewelding of a material to be welded by clamping the material to be welded with upper/lower electrodes, shearing it with a running shear machine, bringing down the shear machine at an advanced limit position, welding the material to be welded, scraping spatters on the lower electrode end face with a disk scraper of the shearing machine while advancing the shear machine in a return process, bringing up the shear machine at the last of the return process and waiting it. SOLUTION: A band like steel sheet A is clamped by lower electrodes (inlet side) 1a, 2a on a fixed table side and is cut by advancing a fixed table side running shear machine (inlet side) 10a to the light side. At an advanced limit, a shear frame 12 of the shear machine 10a is rotated at 90 deg. to be brought down. The fixed table side upper/lower electrodes 1a, 2a are moved together with fixed table side upper/lower die sets 4a, 5a, the band like steel sheets A are butted each other and flash-welded. By releasing the fixed table side upper/lower electrodes 1a, 2a, the band like steel sheet A is sent out. By advancing the shear machine 10a to left, spatters stuck to the fixed table side lower electrode 2a are scraped by a fixed table side spatter removal device (inlet side) 20a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a flash butt welding method and a flash butt welding apparatus having a spatter removing apparatus.

[0002]

2. Description of the Related Art In flash butt welding, spatter generated during welding adheres to the pressurized surface and end surface of the electrode and enters the gaps of various devices, thereby affecting weldability and damaging the electrode pressurized surface. Often occurred. A first conventional example of an apparatus for solving this problem is disclosed in JP-A-56-50790.
As described in the publication, in a flash butt welding machine provided with electrodes on a die set disposed on a fixed table and a movable table, a traveling vehicle traveling between the fixed table and the movable table in a direction perpendicular to the movable table. Is provided, and the traveling carriage is provided with a spatter removing device that comes into contact with the electrode end surface.
And a knife-edge-shaped or brush-shaped scraping device provided with a constant clearance between the electrode end face and the traveling shearing machine, when shearing the front and rear ends of the steel sheet, comes to scrape off spatter on the electrode end face. I have.

In the second example, as described in Japanese Patent Publication No. 7-90390, an upper electrode and a lower electrode for clamping a material to be welded, a blade and a pair of scrapers for removing spatter are attached. A rotary shear frame; and a spring for pressing the scraper against end surfaces of the upper electrode and the lower electrode.

[0004]

However, in these prior arts, the cutting device (such as a rotary shear) is operated to cut the steel strip in a state where welding of the steel strip has been completed and spatter has adhered to the electrode. At the same time as this cutting step, spatter is removed. After that, the next welding operation is performed.

[0005] As described above, since the cutting process is performed in a state where the sputter adheres to the electrode, the sputter bites into the cutting blade, causing malfunction of the blade and deteriorating the cutting state of the steel strip. For this reason, in order to prevent the strip from breaking in the rolling mill, the feeding of the strip was temporarily stopped, the welded portion was cut off, and re-welding was performed. Such work suspension was often necessary.

The present invention has solved the above-mentioned problems, and has a flash butt welding method and a flash having a spatter removing device, which can reduce the number of re-weldings, reduce the breakage in a rolling mill, and prevent a short stop due to maintenance of a rotary shear blade. It is an object to provide a butt welding device.

[0007]

Means for Solving the Problems To solve the above problems, the configuration of the present invention is as follows. That is, in the method of the first configuration, the feeding is temporarily stopped in the middle of feeding the strip-shaped long workpiece in the length direction, and the preceding workpiece and the following workpiece are welded by abutting their end faces. In the flash butt welding method, an upper electrode and a lower electrode for clamping a material to be welded, a guide rail extending in the width direction of the strip immediately below these electrodes, and a traveling shear mounted on the guide rail And a spatter removal device having a disk scraper provided in the traveling shearing machine, wherein the traveling shearing machine is provided with a shear having a disk blade on a carriage slidably mounted on the guide rail. A frame is provided so as to be rotatable in a range of about 90 degrees through a rotating shaft and a stopper. The preceding welded material is clamped by upper and lower electrodes on the output side, and the subsequent welded material is clamped. Material on the incoming side Clamping, advancing the shearing process to the traveling shears to shear the material to be welded, positioning the shear frame at the forward limit position in a state of being tilted 90 degrees, welding the material to be welded in this state, Moving the return stroke to the traveling shearer, at this time, bringing the end face of the disk scraper into contact with or close to the lower electrode end face to scrape off spatter, raise the shear frame at the end of the return stroke, To have the shears wait for the next shear stroke.

The device of the second configuration comprises an upper electrode and a lower electrode for clamping a material to be welded, a guide rail provided immediately below these electrodes and extending parallel to the electrode length direction, and a device mounted on the guide rail. A traveling shear, and a spatter removing device provided in the traveling shear, wherein the traveling shear has a disk cutter with respect to a carriage slidably mounted on the guide rail. A frame is rotatably provided in a range of about 90 degrees via a rotating shaft and a stopper. The spatter removing device is provided on an upper surface in a state where the shear frame is tilted in a return stroke, and the lower electrode The disk scraper is mounted on a rotating shaft having a posture perpendicular to the end face of the disk scraper so as to be freely rotatable.

[0009]

Embodiments of the present invention will be described below based on one embodiment shown in the drawings. In FIGS. 1 and 2, a strip steel plate A as a material to be welded is welded in a state sandwiched between an upper electrode 1a, 1b and a lower electrode 2a, 2b of a flash butt welding machine, and then, in the direction of an arrow (right in FIG. 2). Sent to Then, the upper electrode 1a on the moving table side (the input side of the material to be welded)
And the lower electrode 2a are respectively the upper die set 4 on the moving table side.
a and the lower die set 5a, and the upper electrode 1b and the lower electrode 2b on the fixed base side (outgoing side of the material to be welded) are the upper die set 4b and the lower die set 5b on the fixed base side, respectively.
Attached to.

In FIGS. 1, 2 and 4, a guide rail 3 is provided immediately below these electrodes so as to extend in parallel with the electrode length direction (width direction of the strip), and a traveling rail mounted on the guide rails. Shearing machine 10 (10a is a moving table side traveling shearing machine, 10b
Denotes a fixed-table-side traveling shearing machine) and a sputter removing device 20 (20a is a movable-table-side spatter removing device and 20b is a fixed-table-side spatter removing device) provided in the traveling shearing machine 10.

The traveling shear 10 is called a rotary shear, and a shear frame 12 having a disk blade 15 is mounted on a carriage 11 slidably mounted on the guide rail 3.
Is rotatably provided in a range of about 90 degrees via a rotating shaft 13 and a stopper 14.

In FIGS. 5 and 6, the sputter removing device 20 is provided on a top surface of the rotating shaft 28 which is provided on the upper surface when the shear frame 12 is tilted in the return stroke and is perpendicular to the end surface of the lower electrode 2. A disk scraper 24 is attached so as to be freely rotatable.

The operation state will be described above. Figure 1
In the flowcharts of FIGS. 4 and 7, when started, the workpiece A is clamped by the outlet electrodes 1 b and 2 b, the shearing process (the right stroke in FIG. 1) is advanced to the outlet rotor shear 10 b and cut. 90 with frame forward
Turn around and beat. Further, when the trailing coil is sent out and the leading end of the trailing coil exceeds the entrance electrodes 1a and 2a, it is clamped by these, the entrance rotor shear 10a is advanced to the right in FIG. Turn 90 degrees to defeat it. Next, the entrance-side electrodes 1a and 2a are moved to the right in FIG. 2 together with the die set to abut the workpiece A on the entrance-side exit side to start flash welding. When the welding is completed, a flash trimming process is started. When this is completed, the electrode is opened and the workpiece A is fed to the right in FIG.

Next, in FIGS. 1, 2, and 7, the traveling shears 10 (10a, 10b) move leftward in FIG. 1 and enter a return stroke. At this time, the disc scraper 24 projects to the upper surface of the shear frame 12, and the end face of the disc scraper 24 faces the end face of the lower electrode 2,
In this return process, spatter is removed. Thereafter, at the end of the return stroke, the shear frame is raised and the traveling shear is parked for the next shear stroke.

Now, in FIG. 3, if the traveling shear 10 is moved to the left while the end surface of the scraper 24 is in contact with the end surface of the lower electrode 2, frictional force is applied to the scraper 24 in an anti-running manner. When the rotation center O of the scraper 24 is shifted upward with respect to the horizontal center line L of the lower electrode, the frictional force is larger on the lower side than on the upper side of the rotating shaft. Therefore, the scraper 24 is rotated by a counterclockwise rotating force, and the sputter adhered to the lower electrode 2 is scraped down. When the rotation center O is shifted downward, it rotates clockwise, and when it is not shifted, it rotates in any direction due to a slight difference in frictional force.

As described above, since the cutting step is performed in a state where the electrode spatter has been removed, the sputter does not bite into the cutting blade, the blade does not malfunction, and the cutting state of the strip steel plate does not deteriorate. Therefore, in order to prevent the strip from being broken in the rolling mill, the suspension of operations such as temporarily stopping the feeding of the strip, cutting off the welded portion, and performing re-welding has been significantly reduced ( For example, 250 times / month → 100 times / month).

The present invention is not limited to the examples and embodiments described above, but includes various modifications without departing from the spirit and scope of the claims.

[0018]

EFFECTS OF THE INVENTION According to the configuration of the present invention, it is possible to prevent the blade rotation failure by removing the electrode debris, to reduce the blade care time, and to extend the life of the blade. In addition, the number of rewelds was reduced due to the stability of the cut shape of the steel plate. Furthermore, welding accuracy was improved due to the stable cutting shape, and the number of breakage accidents in the rolling mill was reduced. In addition, since the scraper is a disk, it is rotated by shifting the center, and the disk is used as a whole,
The durability of the scraper is increased, and the disk can be rotated without power.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 2;

FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG. 1;

FIG. 5 is an enlarged front view of the sputter removing apparatus.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a flowchart illustrating an operation state.

[Explanation of symbols]

 A strip steel plate 1 Upper electrode 1a Upper electrode on fixed base side (entrance side) 1b Upper electrode on movable base side (exit side) 2 Lower electrode 2a Lower electrode on fixed base side (entry side) 2b Lower electrode on movable base side (exit side) 3 Guide rail 4 Upper die set 4a Upper base die set on fixed base side (entrance side) 4b Upper die set on mobile base side (outside) 5 Lower die set 5a Lower die set on fixed base side (entry side) 5b Lower die set on mobile base side (Exiting side) 10 Traveling shearing machine 10a Fixed platform traveling shearing machine (entry side) 10b Moving platform traveling shearing machine (exiting side) 11 Truck 12 Shear frame 13 Rotating shaft 14 Stopper 15 Disk blade 20 Sputter removal device 20a Fixed base side spatter remover (entrance side) 20b Moving base side spatter remover (outside) 21 Bracket 22 Base rotating disk 23 Rotating shaft 24 Disk scraper

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) B23K 37/04 B23K 37/04 D 37/08 37/08 A

Claims (2)

[Claims] 1. A flash butt welding method in which a belt-like long material to be welded is suspended in a longitudinal direction, the feeding is temporarily stopped, and a preceding material to be welded and a following material to be welded are abutted and welded to each other. An upper electrode and a lower electrode for clamping a material to be welded, a guide rail provided to extend in the width direction of the strip immediately below these electrodes, a traveling shear mounted on the guide rail, A sputter removal device provided with a traveling shear and having a disk scraper is provided,
In the traveling shearing machine, a shear frame having a disk blade is rotatably provided in a range of about 90 degrees via a rotating shaft and a stopper with respect to a carriage slidably mounted on the guide rail. The preceding welded material is clamped by the upper and lower electrodes on the outgoing side, and the subsequent welded material is clamped by the upper and lower electrodes on the incoming side, and the shearing process is advanced to the traveling shearing machine. The material to be welded is sheared, the shear frame is positioned at the forward limit position in a state where the shear frame is tilted by 90 degrees, the material to be welded is welded in this state, and then the process returns to the traveling shearing machine and the stroke is advanced. The end face of the disk scraper is brought into contact with or close to the end face of the lower electrode to scrape off the spatter, raise the shear frame at the end of the return stroke, and wait the traveling shear for the next shear stroke. Flash Butt welding method. 2. An upper electrode and a lower electrode for clamping a material to be welded, a guide rail provided immediately below these electrodes and extending in parallel with the electrode length direction, and a traveling shear mounted on the guide rail. Machine, and a spatter removing device provided in the traveling shearing machine, the traveling shearing machine, a bogie slidably mounted on the guide rail, a shear frame having a disk blade and a rotating shaft. The stopper is provided rotatably in a range of about 90 degrees through a stopper. The spatter removing device is provided on an upper surface in a state where the shear frame is tilted in a return stroke, and is perpendicular to an end surface of the lower electrode. A flash butt welding apparatus having a spatter removing device, wherein a disk scraper is rotatably mounted on a rotating shaft having a posture as follows.