JPH09314229A - Method for forming hole for detecting position of weld zone of metallic strip and device for forming recessed part therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a hole for detecting the position of the weld zone of a metallic strip in proximity to the weld zone. SOLUTION: This method is a forming method of the hole for detecting the position of the weld zone where is welded for continuously rolling plural metallic strips in the cold rolling line for metallic strips and, after the recessed part is formed in the vicinity of the weld zone of the metallic strip 23 with a recessed part forming device 1 before the cold rolling, the recessed part is broken by the cold rolling and a through hole is formed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to continuously rolling a metal strip in a cold rolling line,
The present invention relates to a method for forming a weld position detecting hole which is formed in the vicinity of a weld in order to detect the position of the weld when connecting front and rear strips by welding with an online welder, and a recess forming device therefor.

[0002]

2. Description of the Related Art In a metal strip processing line, front and rear strips are welded and connected by an online welding machine in order to continuously process the metal strips. Since such a welded portion is generally cut and removed later for scraping, it is necessary to be able to detect the position of the metal strip to which the welded portion is connected by a position detecting device or the like. is there.

As a method for detecting a welded portion of such a metal strip, generally, a position detection is performed in which a welded portion detecting hole is formed in the vicinity of the welded portion and the position of the metal strip moving on the transport line is detected. The device detects the welded portion detection hole so as to recognize that the welded portion has passed.

Further, it is desirable that the hole for detecting the welded portion is formed at a position as close to the welded portion as possible so as not to reduce the product yield.

FIG. 4 is a side view showing an arrangement position of a conventional punching puncher for making a hole for detecting a welded portion. The punching puncher 21 welds a metal strip 23 welded by a welding machine 22. It is arranged in the vicinity of the downstream side of the bead trimmer 24, which is provided for cutting the weld bead of the portion.

[0006]

However, the above-described conventional punching puncher is of a type in which a through hole is formed in a metal strip, and a punching force corresponding to the thickness of the metal strip, and a corresponding punch force. Since a frame or the like having mechanical strength is required, there is a problem that it becomes a large facility.

Further, such a large-sized punch puncher is often installed outside the bead trimmer for welding bead cutting, and the distance L between the bead trimmer and the punch puncher shown in FIG. It becomes longer and it is difficult to make a weld detection hole near the weld.
Even if it is possible to make a hole for detecting a weld near the weld, there is a problem in that if the hole becomes larger due to rolling due to the large punch hole, the metal strip may be broken or drawn. .

Further, in order to solve the above-mentioned problems and to move the welded portion of the metal strip to the center position of the punching puncher with high precision, equipment such as transfer and pinch roll is required and ,
There was a problem that the time required for the movement was long.

The present invention has been made in order to solve the above-mentioned problems of the prior art. Since the through hole such as the weld position detecting hole is not opened by the puncher, the punching force is small. Therefore, since the equipment can be made compact, it is possible to provide a method for forming a weld slip position detecting hole of a metal slip capable of forming a weld position detecting hole close to the weld portion, and a recess forming device therefor. It is an object.

[0010]

A method of forming a weld slip position detecting hole of a metal slip according to the present invention is a method for welding a plurality of metal strips in a cold rolling line for metal strips so as to continuously roll the metal strips. A method of forming a weld position detecting hole for detecting the position of a weld, which comprises forming a recess in the vicinity of a weld of a metal strip prior to cold rolling, and then forming the recess by cold rolling. It is to break to form a through hole.

The recess has a diameter of 0.5 to 5.0.
mm, and the depth is 0.5 to 3.0 mm.

Before the cold rolling, when a recess having a shape (diameter and depth) corresponding to the thickness of the metal strip is formed in the vicinity of the welded portion and then the cold rolling of the metal strip is performed, the center of the recess is started. To break. Then, this fractured portion becomes a through hole having a certain area by further rolling.

Since the thickness of the metal strip of the material used for cold rolling is usually 1.0 to 3.2 mm, in order to form the through holes as described above by cold rolling, it is necessary to form the hollows. If the diameter is in the range of 0.5 to 5.0 mm and the depth of the depression is 0.5 to 3.0 mm, it is possible to form a through hole having a diameter of 2 to 3 mm necessary for detecting the welded portion position.

Further, since only the depression is formed, less horsepower is required for processing than when punching the through hole, so that the apparatus for forming the depression can be made compact.

Therefore, the position where the recess is formed and the position where the hole for detecting the position of the weld is formed can be brought closer to the weld, and the product yield can be improved.

Further, the depression forming device according to the present invention is
A recess forming device for forming the recess on a metal strip, which is attached to an elevating frame for pressing a metal strip of a bead trimmer attached to an online welding device for the metal strip, and a recess forming punch and the punch. A punch holder for holding, a weight provided at the upper end of the punch holder, a guide post for vertically moving the punch holder, a fluid pressure cylinder with the cylinder rod operating in a vertical direction, and a fluid pressure It is composed of a rotating arm which is connected to the tip end portion of the cylinder rod of the cylinder and the punch holder intermediate portion in a link shape, and which pivotally supports the intermediate portion.

By raising the cylinder rod of the fluid pressure cylinder, the punch holder is lowered through the rotating arm and the punch is applied to the metal strip.

The hitting of the punch creates a depression in the metal strip. Since the depression forming device is attached to the lifting frame for pressing the metal strip of the bead trimmer, it is possible to form the depression near the welded portion of the metal strip.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in the front view of FIG. 1, a recess forming apparatus 1 for forming a welded portion position detecting hole of a metal strip according to an embodiment of the present invention has a welded portion of a metal strip 23. Is provided on the elevating frame 25 of the bead trimmer 24 for cutting the welding bead, and the depression forming punch 2, the punch holder 3 holding the punch 2, and the elevating frame for raising and lowering the punch holder 3 substantially vertically. 25, a guide post 4 fixed to the fluid pressure cylinder 5, a fluid pressure cylinder 5 in which the operating direction of the cylinder rod 5a is vertical, and one end of which is rotatable with a pin 6 provided at the tip of the cylinder rod 5a of the fluid pressure cylinder 5. The other end of the punch holder 2 is rotatably connected to the pin 7 provided in the middle portion of the punch holder 2 through a long hole 8. Support members 9 provided on the over arm 25
A pivot arm 1 rotatably connected to the pin via a pin 10.
1 and a weight 12 provided on the upper end of the punch holder 3
It is composed of

Since the elevating frame 25 is connected to the fixed upper frame 26 through the clamp cylinder 27 and is moved up and down by the clamp cylinder 27, the recess forming device 1 also moves up and down together with the clamp cylinder 27. .

Metal strip 23 with bead trimmer 24
When cutting the weld bead, the clamp cylinder 27 operates and the elevating frame 25 descends, and the upper clamp liner 28 provided on the lower end of the elevating frame 25 and the lower clamp liner 30 provided on the upper part of the lower frame 29.
With, the both sides of the welding line of the metal strip 23 are sandwiched, and the welding bead is cut. Therefore, when the weld bead of the metal strip 23 is being cut by the bead trimmer 24, the recess forming device 1 is also lowered and is in a state of approaching the metal strip 23.

FIG. 2 is a sectional view taken along the line A--A of FIG. 1, but this pit forming device 1 is capable of forming two pits at the front and the back with the welding line of the metal strip 23 sandwiched between them. Two punch holders 3, two guide posts 4 and two weights 12 are provided.

Rails 31 and 32 are provided on the elevating frame 25 and the lower frame 29 of the bead trimmer 24, and the upper tool rest 33 and the lower tool rest 3 respectively.
4 moves on these rails 31 and 32 along the welding line of the metal strip 23, and the welding beads are cut by the cutting tools provided on the upper tool rest 33 and the lower tool rest 34. Then, after the welding bead is cut and the upper tool rest 33 and the lower tool rest 34 move to the widthwise ends of the metal strip 23, the depression forming device 1 forms depressions on both sides of the welding line.

Next, a method of forming the welded portion position detecting hole of the metal slip according to the embodiment of the present invention using the recess forming device 1 will be described.

As described above, the bead trimmer 24
After the welding bead has been cut by, the fluid pressure cylinder 5 shown in FIG. 1 is operated to raise the cylinder rod 5a. When the cylinder rod 5a rises, the rotating arm 11 rotates clockwise around the pin 10 of the support member 9. Therefore, a downward force acts on the pin 7 provided on the punch holder 3. This downward force is applied to the rotating arm 1
1 has a long hole 8 and a pin 7 of the punch holder 3
Are maintained by moving in the slot 8. Therefore, the punch holder 3 smoothly descends while being guided by the guide post 4.

When the punch 2 attached to the tip of the punch holder 3 hits the surface of the metal strip 23, the kinetic energy of the weight 12 provided at the upper end of the punch holder 3 causes both sides of the welding line of the metal strip 23. A dimple is formed.

Then, the metal strip 23 in which the recess is formed is rolled to break the recess and form a through hole.

FIG. 3 is a cross-sectional view of the recess 13 formed in the metal strip 23 by the punch 2 as described above. The diameter D of the recess 2 is 0.5 to 5.0 mm,
The depth H may be 0.5 to 3.0 mm.
This is because the thickness of the raw strip that is usually rolled by cold rolling is 1.0 to 3.2 mm, and the raw strip in this thickness range is rolled into a strip with a thickness of 1/3 to 1/10. This is because, when such rolling is performed, a through hole having a diameter of 2 to 3 mm, which is necessary as a hole for detecting a welded portion, can be formed from the recess having the size described above.

[0029]

According to the method for forming the welded portion position detecting hole of the metal strip of the present invention, since it is not necessary to form the through hole as in the conventional case, the detecting hole can be formed with a small punching force.

Therefore, the recess forming device for forming the welding position detecting hole of the metal slip can be constructed compactly, and is incorporated in the bead trimmer to detect the welding position at a position close to the welding part. Holes can be formed.

Further, since the detection hole can be made small, troubles such as breakage and drawing of the metal strip do not occur.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of a recess.

FIG. 4 is an arrangement view showing an arrangement state of a puncher for forming a welding portion position detection hole of a conventional metal slip.

[Explanation of symbols]

 1 Cavity Forming Device 2 Cavity Forming Punch 3 Punch Holder 4 Guide Post 5 Fluid Pressure Cylinder 5a Cylinder Rod 6 Pin 7 Pin 8 Pin 8 Long Hole 9 Support Member 10 Pin 11 Rotating Arm 12 Weight

Claims (3)

[Claims] 1. A method for forming a welded portion position detecting hole for detecting the position of a welded portion for continuously rolling a plurality of metal strips in a metal strip cold rolling line, comprising: Prior to cold rolling, a recess is formed in the vicinity of a welded portion of a metal strip, and then the recessed portion is broken by cold rolling to form a through hole, and a welded hole position detection hole for a metal slip is formed. Forming method. 2. The recess has a diameter of 0.5 to 5.0 mm.
The depth is 0.5 to 3.0 mm, and the method for forming a welded portion position detecting hole of a metal slip according to claim 1, wherein the depth is 0.5 to 3.0 mm. 3. An indentation forming device for forming the indentation according to claim 1 or 2 in a metal strip, the elevating frame for pressing a metal strip of a bead trimmer attached to an on-line welding device for a metal strip. A punch for forming a recess, a punch holder for holding the punch, a weight provided on the upper end of the punch holder, a guide post for vertically moving the punch holder, and an operation of a cylinder rod. From a fluid pressure cylinder whose direction is vertical, and a pivot arm that is connected to the tip portion of the cylinder rod of the fluid pressure cylinder and the intermediate portion of the punch holder in a link shape and pivotally supports the intermediate portion. An indentation forming device characterized by being configured.