JP2000024794A - Continuous welding method and continuous welding equipment for strip steel plate in longitudinal direction - Google Patents

Abstract

(57) [Problem] To provide a belt-shaped steel plate which is butt-butted in the width direction, and when the butt portions are continuously welded in the longitudinal direction, two strip-shaped steel plates whose side ends are butt-joined are surely formed. Provided is a method for continuous welding in the longitudinal direction of a strip-shaped steel sheet capable of manufacturing a wide-width welded strip steel sheet having good shape characteristics at a low cost and with high productivity by securing a stable welding accuracy by performing path constraint. . SOLUTION: A pair of pressing rollers disposed on the left and right opposite to each other so as to form a welding space with the abutting portion interposed therebetween, at a lower part of a welding head which can be lowered and arranged above a conveying line, and the pressing roller and the conveying line. And the path is constrained by being sandwiched between large-diameter support rollers disposed vertically opposite to each other, and the butt portion is continuously welded in the longitudinal direction on an extension of the path constraint line.

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, for example by laser beam welding, abutting side edges of strip-shaped steel sheets adjacent in the width direction. For example, when steel sheets of different types (thickness or material) are used for adjacent parts, such as an automobile body, 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. And a continuous welding method.

[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 gazette, by fixing the welding machine, and by conveying the strip-shaped steel sheet to the welding position by the welding machine in a state where the side ends of the strip-shaped steel sheet are abutted with each other, the butt portion of the strip-shaped steel sheet is continuously irradiated by a laser beam. There has been proposed a method of conveying and guiding a strip-shaped steel sheet on the assumption that it is welded in a specific manner.

That is, as shown in FIGS. 6 and 7, the welded side ends of the strip-shaped steel plates a and b are adjacent to each other, and one of the side ends is located on the same vertical plane. d
A method of conveying and guiding a strip-shaped steel sheet to be sent to a welding machine e by contacting with no gap in the same plane on separate conveying surfaces which are arranged next to each other and inclined at an acute angle α and are disposed adjacent to each other. I have.

In this method, the strip-shaped steel plates a and b, which are conveyed vertically apart from each other, are pushed in by a conveying roller r and a vertical roller g, which are arranged obliquely, so that the welding side edges are in the same vertical plane. Guide surfaces c and da of guide members c and d
The belt-shaped steel plates a and b are converged on the same plane by the grip roller f so that the side ends of the strip-shaped steel plates a and b are abutted against each other, and are converged and abutted by the grip roller f. .

In this configuration, the side end may not be a perfect straight line, and when converging by the grip roller f, the gap may be rather widened, or the side ends may be staggered, thereby stably restraining the path. When the butt portion is welded by the welding machine e, stable welding accuracy cannot be ensured, which may cause a problem that the properties of the welded portion obtained by welding are reduced. This phenomenon is particularly remarkable when a thin steel plate is to be welded, and when a strip-shaped steel plate having a different thickness is to be welded.

[0008]

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-mentioned problem is advantageously solved and the strip steel plate is welded. Longitudinal direction of strip-shaped steel sheet with good shape characteristics and wide-width welded strip steel sheet can be manufactured at low cost and high productivity by welding the side ends of the welding side with each other and welding with more reliable path constraint The present invention provides a continuous welding method and a continuous welding equipment.

[0009]

Means for Solving the Problems The first invention of the present invention is:
The length of the strip-shaped steel sheet to which the conveying surfaces of two strip-shaped steel strips adjacent in the width direction are converged and butted in the same plane on the conveyance line, are converged and butted in the same plane, and the butted part is continuously welded in the longitudinal direction. Direction continuous welding method,
A pair of pressing rollers arranged on the left and right opposite to each other so as to form a welding space with the abutting portion sandwiched between the lower part of the welding head that can be lowered and arranged above the conveying line, and the pressing roller and the conveying line sandwiched vertically. A method for continuously welding a strip-shaped steel plate in the longitudinal direction, comprising sandwiching between opposed large-diameter support rollers to restrain the path, and continuously welding the butted portion in the longitudinal direction on an extension of the path restraining line. .

[0010] The second invention is directed to a longitudinal direction of the strip-shaped steel sheet in which the conveying surfaces of two strip-shaped steel strips adjacent in the width direction are converged and butted in the same plane on a transfer line, and the butted portion is continuously welded in the longitudinal direction. A continuous welding equipment in the direction, disposed above the transport line, a welding head equipped with a pressing-down mechanism, and a pair of pressing rollers disposed to face left and right so as to form a welding space below the welding head, A belt-like steel plate comprising: a large-diameter support roll that is vertically opposed to the pressure roller with the conveyance line interposed therebetween, and between the pressure roller, restrains a path of the two strip-shaped steel plates butted against each other. , Which is positioned as an example of a continuous welding facility for carrying out the first invention.

According to a third aspect, in the second aspect, the pair of pressing rollers are mounted on the welding head via an independently driven vertical position adjusting mechanism, so that the vertical position can be adjusted independently. A continuous welding facility in the longitudinal direction of a strip steel plate. A fourth invention is the continuous welding equipment in the longitudinal direction of a strip-shaped steel sheet according to the second invention or the third invention, wherein the support is a large-diameter roll. A fifth invention is the continuous welding equipment in the longitudinal direction of a strip-shaped steel sheet according to the second invention or the third invention, wherein the support is a shoe having a curved support surface.

[0012]

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 introduced into the continuous welding equipment, and the butted portion of the welding side of one strip steel plate and the other strip steel plate is continuously welded in the longitudinal direction by, for example, a laser beam. A continuous welding method and a continuous welding method to be applied in a line for continuously manufacturing a wide-width welded strip of the same type and different thickness or a different width of the same or different thickness. It is a welding facility.

According to the present invention, two strip-shaped steel sheets whose side ends are butted in the same plane are supported on a transfer line by a support such as a roller or a shoe disposed on a lower surface and a welding head disposed on an upper surface. The path is constrained by a pair of pressing rollers disposed to face each other so as to form a welding space at the lower part of the lower part, and the butt portion is continuously welded on an extension of this path restriction line, and the path is near the butt portion. Welding can be performed in a state where the constraint has been securely performed,
During welding, vertical displacement and deformation of the butted portion can be suppressed.

In addition, the path restraining force can be arbitrarily adjusted according to the thickness difference of the strip-shaped steel sheet, the deformation state, and the like. When a thin strip-shaped steel sheet is to be welded, the strip-shaped steel sheets having different thicknesses are to be welded. Also in this case, the displacement and deformation of the butted portion in the vertical direction during welding can be reliably suppressed.

Thus, the welding accuracy is stably improved, and the quality of the welded portion and the shape characteristics of the obtained welded strip-shaped steel plate are improved. In addition, the continuous welding equipment is one in which the path restraining mechanism and the welding function are integrated, has a simple structure, can be made compact, and can be easily installed on a line.

In the present invention, the lower surface of the two strip steel plates is supported by a support, and the upper surface is opposed to the lower part of the welding head when the two strip steel plates whose side ends are butted against each other are supported by a path. The path is constrained by being pressed by a pair of disposed pressing rollers, and the path constraining force can be easily adjusted by raising and lowering the welding head by the pressing down mechanism.

In this case, when the pair of pressing rollers can be vertically adjusted independently by a vertical position adjusting mechanism, and a belt-shaped steel sheet having a different thickness is to be welded,
It is more effective that the position of the pressing surface can be easily provided with a thickness difference step or a difference in pressing force. The pressing roller may be freely rotatable.

As the support, a roll or a shoe having a curved support surface can be used. In order to prevent surface flaws due to friction when supporting a strip-shaped steel plate, a roll is used. It is more advantageous to use
This roller may be freely rotatable in the case of a lightweight structure.However, in the case of a heavy structure, if there is a concern that slippage may occur between the belt and the supporting steel strip, use a drive roll to synchronize with the transport line speed. You may rotate it.

Since the pressing surface of the pressing roller and the supporting surface of the support hold the strip-shaped steel plate in a pressed state, the pressing surface has sufficient rigidity and the supporting surface does not scratch the surface of the strip. A material formed of a material, for example, a material obtained by plating a steel material with Cr or a material lining rubber or resin is preferable.

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 dissimilar 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.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. This embodiment, the steel strip 1 ₁ 2 Article welded, 1 _2, and different thicknesses is shown in the case of using a laser beam welding machine as welding machine. FIG. 1 shows that two strip steel plates 1 ₁ , 1 ₂ are continuously welded in a longitudinal direction by a laser beam 5 r from a welding head 5 h of a laser beam welding machine by a continuous welding equipment in a longitudinal direction of a strip steel plate of the present invention. Te and shows the equipment arrangement example of the line to produce a wide welding steel strip 1a continuously, wherein the butting steel strip 1 _1, 1 ₂ of Article 2, the butt portion in the longitudinal direction by the laser beam 5r An example in which continuous welding is performed is shown.

In this example of equipment arrangement, the uncoiler 2 ₁ ,
2 ₂ strips of steel strip 1 ₁ , 1 mounted in coil form
Rewind _2, while concurrently conveyed at different angles, the lower surface of the side edge between the steel strip 1 ₁ and the steel strip 1 _2, in the process of converging on the same plane, against no gap by the guide device 3,4 from lead to continuous welding equipment 5 of the present invention, wherein the steel strip 1 ₁ and the steel strip 1 ₂ while path constraint,
Match the butt to welding head 5 of laser beam welding machine.
h to form a welded strip steel plate 1a consisting of strip steel plates 1 ₁ and 1 ₂ , which is cut into a predetermined size by an output shear 6 to produce a wide welded steel plate 1b. It is configured to be stored on the pallet 7.

The continuous welding equipment 5 of the present invention used here is:
As more specifically shown in FIGS. 2 to 4, the steel strip 1 ₁ 2 Article abutted side edges and 1 _2, supports the lower surface of the steel strip 1 ₁ and 1 ₂ at the lower side of the conveying line Welding head 5h that can be lowered and adjusted by a supporting roll 8 as a support and a pressing mechanism 10 arranged on a gantry 9 above the transfer line.
And a pair of pressing rollers 14 a and 14 b having a position adjusting mechanism 12, which are disposed to face left and right so as to form a welding space 11 below the welding head, and are supported by a support roll 8. ₁ is a pressing roller 14a
Accordingly, also the steel strip 1 ₂ is the pressing roll 14b,
A pass restrained by pressing respectively, the butted portion of the steel strip 1 ₁ and 1 _2, and configured to continuously longitudinally welded by the laser beam 5r from welding head 5h.

The support roll 8 and the pressing rollers 14a, 14
The axis of b is on the same vertical plane as shown in FIG.
As shown in FIG. 4, the support roll 8 and the pressing roller 14a
Constraint line pa, and the path constraint line pb by the support roll 8 and the pressing roller 14b are on the same line p, the butt portion is between the pressing rollers 14a and 14b, and the welding point wp is the path constraint line pa, pb. Is on the extension line po. Therefore, the steel strip 1 ₁ and 1 _2, support rolls 8
And the pressing rollers 14a and 14b can surely restrict the path to the vicinity of the butted portion.

The pressing force for restraining the path by the pressing rolls 14a and 14b can be applied by raising and lowering the welding head 5h by the pressing down mechanism 10. In this example, the pressing rolls 14a and 14b are the position adjusting mechanism 12, along the guide 13, each independently can position adjustment, or with a difference in the pressing force against the pressing force and the steel strip 1 ₂ for the steel strip 1 _1, the different steel strip thicknesses path constraining When the pressing roll 14
This is convenient when a thickness difference step is provided between the pressing surfaces a and 14b. However, it is not indispensable to provide the above-described pressing mechanism 10 and the vertical position adjusting mechanism 12 together. For example, when only a strip-shaped steel plate having the same thickness is to be welded, the vertical position adjusting mechanism 12 may be omitted.

[0026] In the above example, the case where the steel strip 1 ₁ and 1 ₂ pass restraint, as a support for supporting the lower surface, is used the support roll 8, for example, as shown in FIG. 5, the support surface 8c
Can be used as a kamaboko-shaped support shoe 8k having a curved surface. The support roll 8 and the supporting shoe 8k is obtained by forming a groove 8a in the lower part of the steel strip 1 ₁ and 1 ₂ of the butt portion. This groove is for forming a degassing space.

According to the present invention, in the continuous welding equipment configured as described above, the conveying surfaces of the _two strip-shaped steel plates ₁₁ and 12 being conveyed in parallel are converged in the same plane and their side ends are butted together. A pair of pressing rollers 14a and 14b, which are disposed on the upper surface and left and right to face each other so as to form a welding space 11 with the butting portion therebetween, while the lower surface is supported by the supporting roll 8 and the supporting shoe 8k, and the pair of pressing rollers And between the support rolls 8 that are vertically opposed to each other, and on the extension of the path constraint lines pa and pb, the laser beam 5 from the welding head 5h to the welding point wp of the butt portion.
r can be irradiated to continuously weld the butt portion in the longitudinal direction.

According to the present invention, the path can be reliably restrained to the vicinity of the butt portion to be continuously welded, and the pressing force of the pressing surfaces of the pressing rollers 14a and 14b is reduced by the welding head 5.
h reduction mechanism 10, the pressing roller 14a, the vertical position adjustment mechanism 12 of the 14b, the steel strip 1 ₁ and 1 ₂ of the thickness difference can be arbitrarily adjusted according to the deformation conditions and the like, welded to the steel strip of thin thickness When targeted, even when strip-shaped steel plates having different thicknesses are to be welded, it is possible to suppress displacement and deformation of the butted portion in the vertical direction during welding,
It is possible to stably improve the welding accuracy and improve the quality and shape characteristics of the welded portion of the obtained welded strip-shaped steel sheet. Further, the continuous welding equipment used in the present invention integrates a path restraining mechanism capable of arbitrarily adjusting a path restraining force and a welding function, has a simple structure, can be made compact, and can be easily installed on a line. .

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 of the same steel type, and the present invention is applicable to both cases of the same thickness and 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.

Regarding the structure, arrangement, and the number of the supports, the pressing rolls, the pressing mechanism, the vertical position adjusting mechanism, the transfer device, the guide device, and the welding machine, which constitute the present invention, Depending on the size, the number of strips, the welding conditions, the arrangement of the equipment, and the like, there may be changes within the scope satisfying the claims.

[0031]

According to the present invention, the strip-shaped steel sheet which is being conveyed in parallel by abutting the side ends on the welding side is path-constrained on the conveyance line by the support and the pressing roll, and the butt portion is formed on the extension of the path-constraint line. In the case where a thin plate is to be welded, welding is performed in a state where the path constraint is more reliably performed, and deformation of the resulting welded strip-shaped steel plate due to welding is more reliably suppressed, and its shape characteristics are improved. Thus, it is possible to obtain a wide band-shaped welded steel sheet having good weld properties and good quality with high productivity. Further, the continuous welding equipment used in the present invention has a path restraining mechanism and a welding function integrated with each other, has a simple structure, can be made compact, and can be easily installed on a line.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view showing an example of equipment arrangement of a continuous welding line in the longitudinal direction of a strip-shaped steel sheet according to the present invention.

FIG. 2 is an explanatory front view of the continuous welding equipment of the present invention in FIG.

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

FIG. 4 is an explanatory cross-sectional plan view taken along the line Aa-Ab in FIG. 2;

FIG. 5 is a three-dimensional explanatory view showing another example of a support in the continuous welding equipment of the present invention.

FIG. 6 is an explanatory side view showing an example of a conventional continuous welding equipment arrangement in the longitudinal direction of a strip-shaped steel sheet.

FIG. 7 is an explanatory plan view of FIG. 5;

[Explanation of symbols]

1 ₁ , 1 ₂ strip steel plate 2 ₁ , 2 ₂ uncoiler 3, 4 guide device 5 continuous welding equipment 5 h welding head 5 r laser beam 6 shear 7 pallet 8 support roll 8 a groove 8 k support shoe 8 c support surface 9 gantry 10 pressing mechanism 11 welding Space 12 Vertical position adjustment mechanism 13 Guides 14a, 14b A pair of pressing rolls wp Welding point p Same line pa, pb Path restriction line by pressing roll po Extension line of path restriction line

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E068 BE00 BE01 CA14 CE11 DA14 DB01 4E081 AA12 BA02 CA19 DA05 EA45 EA49 FA08

Claims (5)

[Claims] 1. The conveying surfaces of two strip-shaped steel strips adjacent in the width direction are converged and abutted on the same plane on a conveying line,
A pair of pressing rollers arranged on the left and right opposite to each other so as to form a welding space with the abutting portion sandwiched between the lower part of the welding head that can be lowered and arranged above the conveying line, and the pressing roller and the conveying line sandwiched vertically. A method for continuous welding in the longitudinal direction of a strip-shaped steel sheet, comprising sandwiching a path between support members disposed opposite to each other to restrict a path, and continuously welding the butted portion in the longitudinal direction on an extension of the path restriction line. 2. The conveying surfaces of two strip-shaped steel strips adjacent in the width direction are converged and abutted on the same plane on a conveying line,
This is a continuous welding equipment in the longitudinal direction of a strip-shaped steel plate for continuously welding the butt portion in the longitudinal direction, and a welding head provided with a pressing-down mechanism, which is arranged above a transport line, and a welding space is formed below the welding head. A pair of pressing rollers disposed to face each other so as to face each other, and a support member which is disposed to face the pressing rollers vertically above and below the conveying line, and restrains the two strip-shaped steel plates butted against each other with the pressing rollers. And a continuous welding equipment in the longitudinal direction of the strip-shaped steel plate. 3. The apparatus according to claim 2, wherein the pair of pressing rollers are mounted on the welding head via an independently driven vertical position adjusting mechanism, and are capable of adjusting the vertical position independently. Continuous welding equipment for the longitudinal direction of strip steel plates. 4. The continuous welding equipment according to claim 2, wherein the support is a roll having a large diameter. 5. The continuous welding equipment according to claim 2, wherein the support is a shoe having a support surface formed into a curved surface.