JPH10263842A - Method for removing seam welding slag and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To catch the welding line steadily and to get rid of welding slag by reciprocating a pair of upper and lower flat grinding brushes interposing a metallic band in the direction of travelling of the metallic band pressing the joining part of the metallic band. SOLUTION: A box body 12 is in the shape of rectangular parallelepiped, and equipped with a flat grinding brush 11 on the bottom surface. The inside surface of the box body 12 touches an eccentric cam 14 which has a rotary shaft vertical to the processing line and has the center of rotation at an eccentric position of the circular section. The height of inside surface of the box body 12 is a little larger than the width, and the upper part of the body 12 is engaged with a horizontal guide 13 which is restricted in the direction lateral to the line and allowed to freely reciprocate in the direction of the processing line. So, by driving an air motor 15, the box body 12 reciprocates in the direction of the processing line corresponding to the rotation of the eccentric cam 14. Consequently, the grinding brush 11 on the flat surface reciprocates in the direction of processing line being pressed against the surface of steel band 1, and resultantly welding slag S is effectively stripped off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing seam welding slag in a continuous metal strip processing facility for continuously processing a metal strip such as a steel strip (hereinafter described as an example of a steel strip).

[0002]

2. Description of the Related Art In continuous steel strip processing equipment for heat treatment and surface treatment of cold rolled steel strip and the like, a seam welding machine is often used as a welding equipment for joining a preceding steel strip and a succeeding steel strip. FIG. 4 is a front view of a state where the preceding steel strip 1a and the succeeding steel strip 1b are seam-welded when viewed from the side of the steel strip, and FIG. 5 is a side view of the same viewed from the traveling direction of the steel strip, as shown in FIG. The two steel plates 2a, 2b arranged above and below the pass line sandwich the connecting portion where the preceding steel strip 1a and the succeeding steel strip 1b are overlapped, and the upper and lower electrodes 2a, 2b are kept pressed. A welding method in which resistance welding is continuously performed by rotating and moving in the width direction of the steel strip, 3 is a transformer, and 4 is a power source.

[0003] Resistance welding is a welding method in which a steel strip is locally heated by using resistance heating called Joule heat when an electric current is passed through a metal, and pressure is applied to join two steel strips. An oxide film (hereinafter referred to as welding slag) is formed on the surface of the joint by heating. The welding slag is easily separated from the joint surface, and the separated welding slag is shown in FIG.
As shown in (1), there is a quality problem in that it adheres to, for example, the deflector roll 7 downstream of the welding machine and causes a press flaw on the surface of the steel strip 1. In order to prevent this, a grinding means is usually provided for the purpose of removing welding slag in advance before feeding the welded steel strip into the line.

FIG. 7 shows an example of the grinding means. In this method, two upper and lower disc-shaped brushes 5a and 5b are arranged immediately after the upper and lower electrodes 2a and 2b, and the disc-shaped brushes 5a and 5b that rotate and follow the movement of the electrodes are welded to the welding lines. To remove the welding slag. A seam welder equipped with a similar scale grinding device was actually
It is also described in JP-A-8384.

In FIG. 8, two upper and lower cylindrical brush rolls 6a and 6b are arranged between the upper and lower electrodes 2a and 2b of the welding machine and the downstream deflector roll 7, and the welding is completed. The rear joint is moved to the position of the brush rolls 6a and 6b and stopped, and the brush rolls 6a and 6b are rotated to remove welding slag.

[0006]

However, the method using a disk-shaped brush as shown in FIG. 7 does not have a sufficient function of removing welding slag. The reason is that, as shown in FIG. 9, since the welding slag S grows normally in the direction perpendicular to the joint, even if brushing is performed in parallel with the joint, the brush peels only by stroking the surface of the welding slag. It is thought that it is because it is not possible. On the other hand, in the method of FIG. 8 as well, the effective range of the brush viewed in the traveling direction of the steel strip 1 is narrow, as shown in FIG. 10, so that the joining point is stopped exactly between the two brush rolls 6a and 6b. If the axial direction of the brush rolls 6a and 6b does not coincide with the welding line, the tip of the brush does not contact the welding slag S and cannot be removed. The present inventors also tried to reciprocate this brush roll in the line advancing direction, but the effect was hardly increased due to a small contact area.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the conventional grinding means and to realize a seam welding slag removing method and apparatus which can reliably capture a welding line and remove welding slag. .

[0008]

A method for removing seam welding slag according to the present invention is a method for removing seam welding slag in a continuous metal strip processing equipment for joining metal strips by seam welding. A pair of planar grinding brushes are reciprocated in the moving direction of the metal band while pressing against a connecting portion of the metal band.

Further, the seam welding slag removing apparatus of the present invention is a seam welding slag removing apparatus in a continuous treatment facility for metal strips for joining metal strips by seam welding,
A pair of planar grinding brushes arranged vertically above and below a metal band, pressing means for pressing the grinding brush against the metal band, and a reciprocating motion in a moving direction of the metal band while the grinding brush is kept pressed. And a moving means for moving. In the seam welding slag removing device, a planar grinding brush is attached to the bottom surface of a rectangular parallelepiped box body, and this box body engages with a horizontal guide that guides reciprocating motion in the line advancing direction. Preferably, the box body is reciprocated in the moving direction of the metal strip by means. Further, it is preferable that the moving means has a rotation axis in a direction perpendicular to the line, has a rotation center at an eccentric position of a circular cross section, and is configured such that an eccentric cam driven by an air motor is inscribed in the box body. .

[0010]

According to the present invention, a flat grinding brush is repeatedly slid in the line advancing direction, that is, in the direction perpendicular to the joint while pressing the joint between the steel strips. And the tip of the brush are securely engaged,
In addition, since the bending is applied to the left and right, the welding slag which has been firmly attached can be effectively peeled off and removed.

Further, since the frame on which the brush is mounted is formed in a rectangular parallelepiped shape, and the brush is formed in a rectangular flat shape, the joining portion may be moved and stopped so as to be within the width of the rectangular parallelepiped. There is also an advantage that it may be. Next, an embodiment of the welding slag removing apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an upper part of a pair of welding slag removing devices arranged vertically symmetrically with respect to a steel strip 1 (a preceding steel strip 1a and a succeeding steel strip 1b), and 11 is a planar grinding brush. , 12 is a rectangular parallelepiped box body to which it is attached on the bottom surface, 13 is a horizontal guide for guiding the reciprocating motion of the box body 12 in the line traveling direction, 14 is an eccentric cam, 15 is an air motor, and 16 is an air cylinder. FIG. 2 is a perspective view of a main part.

In FIG. 1 and FIG. 2, the box body 12 has a rectangular parallelepiped shape, and has a flat surface on the bottom surface (the side facing the steel strip, and the one below the steel strip is actually the top surface). A grinding brush 11 is attached, and is inscribed on the inner surface of the box body 12 with an eccentric cam 14 having a rotation axis in a direction perpendicular to the line and having a rotation center at an eccentric position of a circular cross section. The height of the inner surface of the box body 12 is slightly larger than the width (the length in the line traveling direction), and the upper part of the box body 12 is constrained in the line width direction, and the horizontal guide 13 is capable of reciprocating in the traveling direction. The box body 12 reciprocates in the line advancing direction in accordance with the rotation of the eccentric cam 14 by driving the air motor 15 since the box body 12 is engaged. Horizontal guide 13
An air cylinder 16 is provided above the box, and presses the box body 12 against the steel strip 1. Note that the length of the cylindrical body constituting the eccentric cam 14 does not need to be equal to the entire length of the box body 12, and may be shortened. The shape is not limited to a cylindrical body, and may be a disk shape.

With the above configuration, the planar grinding brush 11
Reciprocates in the line advancing direction while being pressed against the surface of the steel strip 1, thereby effectively exfoliating and removing the welding slag S grown in the direction perpendicular to the welding line. When the device is not used, the air cylinder 16 can be raised and opened. Also, if the reciprocating motion of the grinding brush 11 is too fast, a load is applied to the reciprocating mechanism, and if the reciprocating motion is too slow, the efficiency is reduced. Set.

As the grinding brush 11, it is desirable to use a commercially available one made of stainless steel wire or the like. Since the grinding brush 11 does not move in the width direction of the steel strip, the length in the width direction needs to be equal to or more than the maximum width of the steel strip. The width in the line traveling direction can perform stable brushing, and
In order not to increase the size unnecessarily, it is practical to set the thickness to about 20 to 30 mm.

Although various mechanisms are conceivable as means for pressing the steel strip, an air cylinder is the most affordable in terms of economy, operability, operation stability, and the like. In addition, it is desirable that the operating positions of the upper and lower pressing means are in principle the same. Also, the example of the eccentric cam has been described as the mechanism of the reciprocating motion, but an air cylinder is arranged in the line traveling direction, and the like.
Any other mechanism may be used.

FIG. 3 shows an example of the rate of occurrence of surface quality defects caused by welding slag before and after installation of the present apparatus. That is, in this line, the quality defect occurrence rate of about 2% was 0.04%.
%.

[0017]

According to the present invention, a seam welding slag removing device capable of reliably capturing a welding line and removing welding slag is realized, and the surface quality defect caused by the seam welding machine is reduced, thereby reducing the quality of the steel strip. This has an excellent effect of improving the yield.

[Brief description of the drawings]

FIG. 1 is a front view of a slag removing device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the slag removing device in FIG.

FIG. 3 is a graph showing the effect of the present invention.

FIG. 4 is a front view showing a steel strip seam welding machine according to the present invention.

FIG. 5 is a side view showing a steel strip seam welder according to the present invention.

FIG. 6 is a conceptual diagram illustrating a problem in a conventional steel strip seam welding machine.

FIG. 7 is a perspective view of a slag removing device showing a conventional technique.

FIG. 8 is a perspective view of a slag removing device showing another conventional technique.

FIG. 9 is a conceptual diagram showing a problem in the conventional technique shown in FIG.

FIG. 10 is a conceptual diagram showing a problem in the conventional technique shown in FIG. 7.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel strip 1a Leading steel strip 1b Subsequent steel strip 2a, 2b Electrode 3 Transformer 4 Power supply 5a, 5b Brush 6a, 6b Brush roll 7 Deflector roll 11 Grinding brush 12 Box body 13 Horizontal guide 14 Eccentric cam (moving means) 15 Air motor (Moving means) 16 Air cylinder (pressing means)

Claims (4)

[Claims] 1. A method for removing seam welding slag in a continuous metal strip processing facility for joining metal strips by seam welding, wherein a pair of upper and lower planar grinding brushes sandwiching the metal strips is connected to the metal strips. A seam welding slag removing method characterized by reciprocating in a moving direction of a metal band while pressing against a metal part. 2. A device for removing seam welding slag in a continuous metal band processing facility for joining metal bands by seam welding, comprising a pair of planar grinding brushes (11) arranged vertically above and below the metal band. ), Pressing means (16) for pressing the grinding brush (11) against the metal band, and moving means (14, 15) for reciprocating the grinding brush in the moving direction of the metal band while being pressed. A seam welding slag removing device, characterized in that: 3. The flat grinding brush (11) is attached to the bottom surface of a rectangular parallelepiped box (12), and the box (12) is a horizontal guide (7) for guiding reciprocating movement in the line traveling direction. The seam welding slag removing device according to claim 2, wherein the box body (12) is reciprocated in the moving direction of the metal strip by the moving means. 4. The eccentric cam (14) driven by an air motor (15) having an axis of rotation in the direction perpendicular to the line, having a center of rotation at an eccentric position of a circular cross section, and being driven by an air motor (15). The seam welding slag removing device according to claim 3, wherein the device is inscribed in (12).