JPH11319911A - Continuous welding method of band steel plate welded in longitudinal direction and welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the welded band steel plate of good shape property and wide width by holding a band steel plate butted on the same plate with a cantilever work roll having a back up roll and continuously welding the butted part while transferring. SOLUTION: A rear face of a thin band steel plate 11 and a rear face of a thick band steel plate 12 are supported and transferred respectively with a cantilever work roll 9a and a cantilever work roll 10a. Rear faces of the work rolls 9a, 10a are supported with a pair of skewer shaped back up rolls 12. In the same way, the band steels 11 , 12 are transferred while pressed down with the cantilever work rolls 9a, 10a and the back up roll 14. The butted parts of the band steels 11 , 12 are welded with welding machines 5a, 5b. The work rolls 9a, 10a desirably have different diameters equivalent to the difference in thicknesses of the band steels 11 , 12 . The welding machines 5a, 5b are desirably a laser welding machine using CO2 , YAG laser beam.

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 continuously welding longitudinally abutting side edges of strip-shaped steel plates in the width direction by, for example, laser beam welding. For example, different types (thickness or material, etc.) of adjacent parts, such as the body of an automobile
When using a steel sheet of the above, a joining blank material capable of integrally forming these parts is required. The present invention is to continuously weld the side edges of the strip-shaped steel sheet in the longitudinal direction, and to produce the high-quality joining blank material or the wide-width welded strip-shaped steel sheet at low cost and with high productivity, the longitudinal direction of the strip-shaped steel sheet. The present invention relates to a continuous welding method and a continuous welding facility.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a joining blank material as described above, there has been known a method in which strip-shaped sheets are butted together without a gap, and welding is performed while moving a welding machine along the butted portion. I have. in this way,
There is a problem that handling for welding is complicated, cost is increased, and sufficient productivity cannot be secured.

[0003] A method is also known in which both the strip-shaped steel sheet and the welding machine are moved to perform welding, but since the strip-shaped steel sheet cannot be continuously conveyed in the welding equipment, the welding length is limited to that of the welding machine. There is a problem in that the welding is limited by the moving process of the strip-shaped steel sheet, continuous welding cannot be performed over the entire length of the coil, and sufficient productivity cannot be secured.

[0004] Recently, various improvements have been made to solve the above-mentioned problems of the conventional method.
As disclosed in the official gazette, by fixing a welding machine and conveying the strip-shaped steel sheet to the welding position by the welding machine with the side ends of the steel sheet abutting each other, the butt portion of the steel sheet is continuously welded. Transport of strip-shaped steel sheets on the premise that
Guidance methods have been proposed. That is, as shown in FIGS. 7 and 8, the welding ends of the strip-shaped steel plates a and b are adjacent to each other, and one of the side ends is guided by the guiding members c and b in the same vertical plane. There is disclosed a method of conveying and guiding a strip-shaped steel sheet to be brought into contact with a surface, and to be fed to a welding machine e by being brought into contact with each other without any gap in the same horizontal plane on separate conveying planes arranged side by side and inclined at an acute angle α.

In this method, the paper is conveyed vertically apart.
Each of the strip-shaped steel plates a and b is pushed in by a conveying roller r and a vertical roller g which are arranged obliquely, and the guide surfaces c and b of the guide members c and b whose welding side edges are in the same vertical plane.
a, and is converged on the same plane by the grip roller f so that the side edges of the strip-shaped steel plates a and b are abutted against each other. There is a step between the conveying surfaces of the steel plates a and b.

In this configuration, the side end may not be a perfect straight line, and the gap may be widened when converging with the grip roller f, or the side ends may flap with each other. When welding is performed, it is difficult to stably secure a good welded portion, and it is hardly sufficient from the viewpoint of ensuring stable welding accuracy.

When the welding by the welding machine e is converged by the grip roller f and the path is constrained, for example, laser beam welding is performed only on one side, a sudden amount of heat is supplied to the butted portion of the strip-shaped steel sheet by the laser beam. Therefore, welding may cause a problem that the welded portion is thermally deformed by welding, making it difficult to secure stable welding accuracy and deteriorating the properties of the welded portion obtained by welding.

Further, since the welding heat input is only on one side, the welding speed must be kept low. Further, in the case where the strip-shaped steel sheets having different thicknesses are butt-welded, when the path is constrained by the conventional grip roll, for example, only one of the thicker strip-shaped steel sheets a is path-constrained,
As shown in FIG. 9, the welded strip steel plates a and b obtained by performing welding with a laser beam from the upper surface side while performing accurate welding due to thermal deformation of the butted portion of the thin strip steel plate b due to welding heat and welding from the upper surface side. In addition, there is a problem that the thinner strip-shaped steel sheet b is warped upward (cb), and the shape characteristics are easily degraded.

[0009]

SUMMARY OF THE INVENTION According to the present invention, when the strip steel plates are butted in the width direction and the butted portions are continuously welded in the longitudinal direction, the above-described problems are advantageously solved and the welding side of the strip steel plates is solved. Butts with no gaps
In particular, to provide a welding method and a welding equipment in the longitudinal direction of a strip steel plate capable of manufacturing a wide-width welded strip steel sheet having good shape characteristics inexpensively and with high productivity by reliably welding without deforming a welded portion. With the goal.

[0010]

Means for Solving the Problems In order to achieve the above object, the present invention has the following features. (1) A method of continuous welding in the longitudinal direction of a strip-shaped steel sheet in which two strip-shaped steel sheets are butted against each other while being conveyed in parallel, and the butted portions are continuously welded. Each of the two strip-shaped steel plates having their ends butted with no gap is led to a pair of upper and lower cantilevered work rolls each having a pair of backup rolls, and the pair of cantilevered work rolls sandwiches and constrains the path on a transport line. On the path constraint line of the welding space formed between the end surfaces of the cantilever work rolls facing each other in the width direction with the butting portion interposed therebetween,
A method for continuously welding a strip-shaped steel plate in a longitudinal direction, wherein the butted portions are continuously welded from both sides in a longitudinal direction.

(2) In the above (1), the two strip-shaped steel plates have different thicknesses, and pass in a state where a step of thickness difference is formed between the roll surfaces of the cantilevered work rolls facing each other in the width direction. A method for continuously welding a strip-shaped steel plate in a longitudinal direction, wherein the welding is performed.

(3) A pair of upper and lower cantilevered work rolls, each of which is a pair of upper and lower cantilevered work rolls for holding a path by sandwiching two strip-shaped steel plates whose side ends are butted together without any gap, on a transfer line. A strip-shaped steel sheet comprising: a pair of backup rolls to be pressed; and a welding device for welding the butted portion on an extension of a path constraint line of a welding space formed between end faces of the cantilevered work rolls facing each other in the width direction. Longitudinal continuous welding equipment.

(4) In the above (3), a pair of backup rolls for pressing the cantilever work rolls arranged in the width direction to face each other are formed in a skewer shape having two roll surfaces. A cantilevered work roll arranged in a widthwise opposition in a width direction and arranged so as to be simultaneously pressurizable, and a continuous welding equipment in a longitudinal direction of a strip-shaped steel sheet. (5) In the above (3) or (4), the cantilevered work rolls arranged opposite to each other in the width direction have different outer diameters. (6) In any one of the above (3) to (5), a pair of backup rolls for pressing cantilevered work rolls arranged in the width direction and opposed to each other have two skewed roll surfaces having different outer diameters. This is a continuous welding facility in the longitudinal direction of a strip-shaped steel sheet, characterized in that the welding equipment is formed in a longitudinal direction.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to, for example, a method of unwinding a strip steel sheet from two strip steel coils and conveying the strip steel sheet in parallel to one side of a strip steel sheet and the other strip steel sheet. Alternatively, the lower surface and the upper surface are butted in the same plane and guided into the welding equipment while guiding the butted portion to be located on an extension of the welding position, and the one strip steel plate and the other strip steel plate are welded together. A line that continuously welds the butted portions of the ends in the longitudinal direction by, for example, a laser beam, and continuously manufactures a wide-width welded strip of the same type and different thickness or a strip of the same or different thickness. And a welding facility for implementing the welding method.

According to the present invention, when continuous welding is performed in the longitudinal direction by welding the side edges on the welding side of the strip-shaped steel sheets adjacent in the width direction, the strip-shaped steel sheets being conveyed in parallel by welding the side edges on the welding side are paired. A pair of work rolls pressurizable by a backup roll are path-constrained on a transfer line, and the butted portions are continuously welded in a longitudinal direction from both sides on a path constraint line of the cantilevered work roll. The welding is performed in a state where the path is reliably restrained by the cantilever work roll and the backup roll, and deformation of the resulting welded strip-shaped steel sheet due to welding is more reliably suppressed to improve its shape characteristics.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In this embodiment, the steel strip 1 _1, 1 ₂ of the two rows of welded illustrates the case of different thicknesses. FIG. 1 is a view showing the configuration of a strip-shaped steel plate longitudinal welding apparatus according to the present invention.
This shows an example of a facility arrangement of a line for continuously manufacturing a wide welded strip steel sheet by continuously welding the strip-shaped steel sheets 1 ₁ and 1 ₂ in the longitudinal direction with a laser beam welding machine.
Butt steel strip 1 _1, 1 ₂ of the strip, which shows an example of such a continuous longitudinally welded to the abutted portion from the upper side and the lower side.

In this example of the equipment arrangement, the uncoiler 2 ₁ ,
2 ₂ strips of steel strip 1 ₁ , 1 mounted in coil form
Rewind _2, different angles conveying roller 3a, 3
b, 3c and 4a, 4b, while concurrently conveyed in 4c, the lower surface of the side edge between the steel strip 1 ₁ and the steel strip 1 _2, in the process of converging in the same plane in front of the welding equipment 5 of the present invention, guided by the guide device 7 pushing and guiding device 6 against no gap the welding equipment 5 of the present invention, wherein the steel strip 1 ₁
The steel strip 1 ₂ at each state of the path constraint, an abutting portion, the path in the restrained line, upper and lower surface side to the laser beam welding machine 5a is arranged, the steel strip 1 ₁ is welded to the longitudinal direction by 5b, 1 Welded strip steel plate 1 consisting of ₂
a, which is cut to a predetermined size by the delivery shear 8 to produce a wide-width welded steel plate 1b.

More specifically, as shown in FIGS. 2 to 5, the welding equipment 5 of the present invention comprises a thin strip-shaped steel sheet ₁₁ whose lower surface is converged and abutted in the same plane and is joined to the receiving portion A. The laser beam welding machine 5a disposed on the receiving portion A side and the laser beam welding machine 5a
The laser beam rz is applied to the strip-shaped steel plates 11 ₁ and 1 on the path constraint line by the laser beam welding machine 5b arranged on the side.
_{The two} butt portions are irradiated, and the butt portions are continuously welded in the longitudinal direction from the upper surface side and the lower surface side.

The receiving unit A includes a cantilevered work rolls 9a for supporting the lower surface of the thin thickness steel strip 1 _1, the cantilevered work rolls 10a which supports the thick thickness steel strip 1 _2, the cantilever work roll 9a And a pair of backup rolls 12 and 13 for supporting the work roll 10a at the lower side thereof. The welding space 11a is provided between the end faces of the cantilevered work roll 9a and the cantilevered work roll 10a. The welding equipment 5a is arranged so as to irradiate rz. Here, the steel strip 1 _1, the steel strip 1 ₂ and the lower surface in the same plane and so as to pass constrained cantilevered work rolls 9a and cantilevered work rolls 10a
Have roll surfaces of the same diameter.

The backup rolls 12 and 13 have the same diameter.
One of the roll surface 12a of the backup roll 12 and the backup roll 1 are located below the roll surface of the cantilevered work roll 9a.
3 is in contact with one roll surface 13a, and the backup roll 1 is located below the roll surface of the cantilevered work roll 10a.
The other roll surface 12b of the backup roll 13 and the other roll surface 12b of the backup roll 13 are in contact with each other.

On the other hand, the pressing portion B is a thin steel plate 1 having a small thickness.
A cantilevered work rolls 9b which abuts on _one of the upper surface, abutting cantilevered thick upper surface of the steel strip 1 ₂ thick work rolls 10
b, the cantilevered work roll 9b and the work roll 10b
Backup rolls 14, 1 for rolling down
5, a cantilevered work roll 9b and a cantilevered work roll 1
A welding space 11 is formed between the end faces of the welding space 1b.
Welding device 5 so that laser beam rz can be irradiated to 1
a, and the drafting device 16 installed on the gantry
It is supported so as to be able to move up and down by a and 16b.

[0022] The pressure device 16a, the path restraining force against the steel strip 1 ₁ between the receiving portion A of the cantilever work roll 9a and a reduction portion B Cantilevered work rolls 9b in the 16b (holding force)
And at the same time, the cantilever work roll 10a of the receiving portion A
The steel strip 1 ₂ between cantilever work roll 10b of the reduction unit B in the
Can be adjusted. The above-mentioned cantilever work rolls 9a and 9b, 10a and 10
b may be a drive roller or an idle roller.

Each of the backup rolls 12 and 13, and 14 and 15 are provided to further secure and stabilize the path binding force of each cantilever work roll, and have one roll surface. A small diameter portion ds is formed between the roll surface and the other roll surface, and the small diameter portion ds is formed so that the welding spaces 11a and 11b can be sufficiently formed in the longitudinal direction.

At least one of the backup rolls
When the cantilevered work rolls 9a and 9b, 10a and 10b are idle rolls, they are drive rolls. When at least one of the cantilevered work rolls 9a and 9b, 10a and 10b is a drive roll, they are idle rolls. Good.

In FIG. 3, reference numeral 17 denotes a roll chock for the cantilever work roll 10a (9a) slidably mounted on the stand 18 of the receiving portion A up and down. This is a roll chock for the cantilever work roll 10b (9b) that is slidably mounted.

Reference numeral 21 denotes a backup roll 1 mounted on the stand 18 of the receiving portion A so as to be slidable up and down.
The roll chocks 22 and 13 are roll chocks for the backup rolls 14 and 15 which are slidably mounted on the frame 20 of the pressing portion B in a vertical direction.

[0027] With the above construction, the cantilever work rolls and the steel strip 1 ₁ and the steel strip 1 ₂ of the lower surface that was passed constrained by the backup roll is positioned in the same plane, in this example steel strip 1 ₁ and the steel strip 1 ₂
Are different from each other in thickness, so that there is a step of thickness difference, not in the same plane.
The diameters of b and 10b are different, the diameters of the pair of backup rolls 12 and 13 are different, and the upper cantilever rolls 9a and 10a are formed by the pair of backup rolls 12 and 13 to form the strip-shaped steel sheet ₁₁ and the strip. the steel plate 1 ₂ is to be similarly path constraint.

When the path is constrained in this way, the path constrained line pa by the cantilevered work roll 9a and the cantilevered work roll 9b.
And cantilevered work roll 10a and cantilevered work roll 10b
, The path constraint line pa according to
The laser beam rz from the laser beam welding machines 5a and 5b passes through the cantilevered work rolls 9a and 9b and the welding spaces 11a and 11b formed between the cantilevered work rolls 10a and 10b opposed to each other. Line pa
Is irradiated on the extension line pp of the steel strip ₁₁ and the steel strip 1
_{The two} butted portions are welded on the upper surface side and the lower surface side.

As a welding machine, a laser welding machine using a CO ₂ , YAG laser, which can perform welding at a higher speed than other welding means and has a wide application range even in welding between different materials, is preferable. A welding machine capable of supplying a contact-type heat source, such as a plasma welding machine or a plasma-assisted laser welding machine, can be used.

According to the present invention, the band-shaped steel plate to be welded is reliably path-constrained by the cantilever work roll and the backup roll, and the butted portion is continuously welded in the longitudinal direction from above and below (front and back) on an extension of the path-constraint line. By,
As shown in FIG. 6, in the vicinity of the welded portion, the difference in thermal expansion between the upper and lower portions is reduced during welding, deformation is more reliably suppressed, and the shape characteristics of the welded strip steel plate obtained by welding are improved. Can be.

Further, heat input required for welding can be performed from above and below, and the welding speed can be greatly improved.

The present invention is not limited to the above embodiment. For example, the band-shaped steel plate to be welded may be of a different steel type or may be of the same steel type. Further, the present invention can be applied to the case where the band-shaped steel plates to be welded have the same thickness or different thicknesses. The conveying surface of the strip-shaped steel plate to be welded is mainly a horizontal surface in the width direction, but may be a vertical conveying surface or an inclined conveying surface.

In the longitudinal direction, in the process of reaching the convergence device, one of the one strip-shaped steel sheet and the other strip-shaped steel sheet at least partially forms an inclined conveying surface. In the width direction, the horizontal transport surface is the mainstream, but may be the vertical transport surface or the inclined transport surface.

Regarding the diameters of the cantilever work roll and the backup roll, the structure, the arrangement position, and the number of the welders, which constitute the present invention, the type, size and number of strips of the strip-shaped steel plate to be welded. It can be changed within the range satisfying the claims according to welding conditions, equipment arrangement, and the like.

[0035]

According to the present invention, when continuous welding is performed in the longitudinal direction by welding the side edges of the strip-shaped steel plates adjacent in the width direction to each other, the strip-shaped steel plates being conveyed in parallel by welding the side edges of the welding side are joined. , A pair of work rolls pressurized by a pair of backup rolls restrains the path on the transfer line by a pair of work rolls,
The butt portion is continuously welded from both sides in the longitudinal direction on the path constraint line of the cantilever work roll, and welding is performed in a state where the path constraint is securely performed by the pair of cantilever work rolls, and the obtained welding strip shape is obtained. Deformation due to welding of the steel sheet can be more reliably suppressed, and its shape characteristics can be improved, and a wide band-shaped welded steel sheet having good weld properties and good quality can be obtained with high productivity.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view showing an embodiment of a continuous welding apparatus for a strip-shaped steel plate in a longitudinal direction of the present invention.

FIG. 2 is an explanatory front view of the welding equipment of FIG. 1;

FIG. 3 is an explanatory side view of FIG. 2;

FIG. 4 is an explanatory plan view taken along the line Aa-Ab in FIG. 3;

FIG. 5 is an explanatory plan view taken on line Ba-Bb in FIG. 3;

FIG. 6 is an explanatory front view showing an example of a partial shape near a welded portion of a welded strip-shaped steel sheet obtained by the present invention.

FIG. 7 is an explanatory plan view showing a process of guiding a strip-shaped steel sheet to be welded to a welding facility in a conventional continuous welding apparatus for a strip-shaped steel sheet in the longitudinal direction.

FIG. 8 is an explanatory side view of FIG. 7;

FIG. 9 is an explanatory front view showing an example of a partial shape near a welded portion of a welded strip-shaped steel sheet obtained in a conventional example.

[Explanation of symbols]

1 _1, 1 _2: steel strip 1a: Welding the steel strip 1b: wide welding steel plate 2 _{1, 2} 2, 2 _3: uncoiler 3 a to 3 c, 4 a to 4 c: conveying device 5: Welding equipment 5a, 5b: welder rz: Laser beam 6, 7: Guide device 8: Shear 9a, 9b: Cantilever work roll 10a, 10b: Cantilever work roll pa: Path constraint line pp: Extension line of path constraint line 11a, 11b: Welding space w: Welding 12 , 13: backup roll (lower side) 12a, 12b, 13a, 13b: roll surface 14, 15: backup roll (upper side) 14a, 14b, 15a, 15b: roll surface ds: small diameter portion 16a, 16b: pressing device 17: Cantilever work roll chock (lower) 18: Stand 19: Cantilever work roll chock (upper) 20: Frame 21: Backup roll Click (lower) 22: backup roll chock (upper side)

Claims (6)

[Claims] 1. A method of continuously welding two strip-shaped steel plates in parallel in a longitudinal direction, wherein the side ends are butt-joined while the strip-shaped steel plates are conveyed in parallel, and the butt portions are continuously welded. Each of the two strip-shaped steel plates having their ends butted with no gap is led to a pair of upper and lower cantilevered work rolls each having a pair of backup rolls, and the pair of cantilevered work rolls sandwiches and constrains the path on a transport line. ,
On a path constraint line of a welding space formed between the end surfaces of the cantilever work rolls facing each other in the width direction with the butt portion interposed therebetween, the butt portion is continuously welded in a longitudinal direction from both sides thereof. Longitudinal continuous welding method. 2. The method according to claim 1, wherein the two strip-shaped steel plates have different thicknesses, and are path-constrained in a state where a step having a thickness difference is formed between the roll surfaces of the cantilevered work rolls facing each other in the width direction. The method for continuously welding a strip-shaped steel sheet according to claim 1 in the longitudinal direction. 3. A pair of upper and lower cantilevered work rolls, each of which has a pair of upper and lower cantilevered work rolls that are sandwiched and constrained on a transport line, and presses the pair of cantilevered work rolls. A pair of backup rolls, and a strip-shaped steel plate comprising a welding device for welding the butted portion on an extension of a path constraint line of a welding space formed between end surfaces of cantilevered work rolls facing each other in the width direction. Longitudinal continuous welding equipment. 4. A pair of backup rolls for pressurizing cantilever work rolls arranged in the width direction to oppose each other are formed in a skewer shape having two roll surfaces. 4. The continuous welding equipment in the longitudinal direction of a strip-shaped steel sheet according to claim 3, wherein cantilevered work rolls of the opposed arrangement are arranged so as to be simultaneously pressurized. 5. The continuous welding equipment in the longitudinal direction of a strip-shaped steel sheet according to claim 3, wherein the cantilevered work rolls arranged opposite to each other in the width direction have different outer diameters. 6. A belt-like shape wherein a pair of backup rolls for pressurizing cantilevered work rolls arranged in the width direction and opposed to each other are formed in a skewer shape having two roll surfaces having different outer diameters. Continuous welding equipment in the longitudinal direction of steel sheets.