JP3700260B2 - Manufacturing method and equipment row of welded H-section steel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a welded H-section steel and an equipment row.
[0002]
[Prior art]
Welded H-section steel is widely used as an architectural or structural member. A general production line for welded H-section steel is shown in a schematic side view in FIG. As shown in FIG. 3, the welded H-shaped steel has two flange members 2, 2 </ b> A and one web member 3, and the width center of the flange member 2 and the width end of the web member 3 form a V seam. In this manner, the tip of the V seam (welding point 4) is welded and joined by the H welder 5 while passing through the material.
[0003]
The flange members 2, 2 </ b> A are paid out by the payoff reel 7 from the state of the coil 6, flattened by the leveler 8, and then passed through while being connected by the joint welding machine 9. In this respect, the web material 3 is the same, but in the web material 3, both ends of the web material are formed into a dogbone shape by the web upsetter 10 in front of the H welding machine 5 in order to increase the joining area and increase the welding strength. Process is added.
[0004]
The welded H-section steel 1 exiting the H-welding machine 5 is removed by the bead cutting device 11 and cooled by the cooling device 12, and the H-shaped steel straightening machine 13 corrects the flange inclination and lateral bending caused by welding. After that, it is cut into a product length by the shear 14 and sent to a refining process. Reference numeral 21 denotes a straightening roll for correcting lateral bending.
[0005]
[Problems to be solved by the invention]
In the production line of FIG. 3, the two flange members 2, 2 </ b> A are centered so that the center of the width faces the thickness center of the width end surface of the web member 3 after reaching the welding point 4 after leaving the leveler 8. However, since the width varies due to the shearing when it is slit before being mounted on the payoff reel 7, the difference in width between the two sheets is about twice the individual variation. Can occur.
[0006]
In that case, the welded H-section steel 1 is shown in the explanatory diagram of FIG. 4, even if the perpendicularity is good on the entry side of the H-section steel straightening machine 13 (θ = 90 ° in (a)). There is a difference (= 2Δ) in the width of the two flanges 20 and 20A that are connected to both ends of the 30 and face each other. At the time of straight bending correction, the flanges 20 and 20A are simultaneously pressed by the same straightening roll 21 on the same side. Therefore, on the exit side of the H-shaped steel straightening machine 13, there is a problem that the web 30 is inclined and the perpendicularity is deteriorated (θ ≠ 90 ° in (b)).
[0007]
Therefore, the present invention provides a method for manufacturing a welded H-section steel and an array of equipment that can advantageously solve the problem of shape defects that occur during straight-bending correction due to the difference in the width of the two opposing flanges of the welded H-section steel after H-welding. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In the present invention, two flange members and one web member, each of which is discharged from a pay-off reel and leveled and welded together, are welded together in an H shape, and the weld deformation of the welded welded H-shaped steel is corrected. In the manufacturing method of the welded H-section steel, the width adjustment is made so that the difference between these widths becomes zero by upsetting the two flange members, preferably the end of each flange, before welding to the H-shape. It is the manufacturing method of the welded H-section steel characterized by doing.
[0009]
Further, the present invention provides a welded deformation of the welded H-shaped steel obtained by welding and joining two flange members and one web member, each of which is discharged from a payoff reel and leveled and welded together, into an H shape. In the manufacturing line of welded H-section steels that corrects the width, the width adjustment is made so that the difference between the widths of the two flange members is zero on the upstream side of the welder that is welded to the H-shape (hereinafter referred to as H-welder). It is the manufacturing equipment row | line of the welded H-section steel characterized by the flange upsetter to perform being arrange | positioned.
[0010]
The flange upsetter is preferably composed of at least a pair of edging rolls for reducing the width of the flange material and at least one pair of restraining rolls for restraining both surfaces of the flange material.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, the two flanges material before being welded to the H-shaped, so that the delta = 0 in FIG. 4, for width adjustment, poor lateral bending shape of the welded H-shaped steel after correction Never become. This width adjustment may be performed anywhere on the upstream side of the H welder. However, if it is performed immediately after leveling, it is most convenient because the abutting position alignment with the preceding material in the subsequent joint welding can be performed simultaneously.
[0012]
This width adjustment can be performed by cutting the flange end portion, but it is more preferable to perform the width adjustment by upsetting the flange end portion.
FIG. 1 is a schematic side view showing an example of an equipment row of the present invention. In FIG. 1, reference numerals 40 and 40A denote flange upsetters, and the same members as those in FIG.
[0013]
This equipment row is composed of three sets of payoff reels 7 in which each set is discharged from the upstream side in parallel to each one of the two flange members 2, 2A, one web member 3, leveling and joint welding in sequence. , Leveler 8, joint welder 9, two welded flange members 2, 2 A and one web member 3 are welded and joined in H form, and welded welded H form In the production line of welded H-section steel, in which an H-shaped steel straightening machine 13 that corrects the welding deformation of steel 1 and a shear 14 that cuts the welded H-section steel 1 after straightening into a product length are arranged in this order. Furthermore, flange upsetters 40 and 40A that adjust the width of flange materials 2 and 2A are arranged on the exit side of levelers 8 of flange materials 2 and 2A. With this configuration, flange upsetters 40 and 40A are used to Position of the flange material 2 and 2A with the preceding material in the joint welding machine 9 While also serving as a Align it can very easily implemented to align the same width.
[0014]
FIG. 2 is a perspective view of an essential part showing a preferred example of the flange upsetter. 2, 41 is an edging roll and 42 is a restraining roll. The same members as those in FIG. Here, the flange upsetter 40 (40A) is composed of a pair of edging rolls 41 for reducing the width of the flange material 2 (2A) and two pairs of restraining rolls 42 for restraining both sides. The number of pairs may be appropriately selected according to the situation. The edging roll 41 and the restraining roll 42 are stored in a roll box (not shown), and the roll box is attached to a frame exit side end (not shown) of the leveler 8. Since the flange material 2 (2A) is pushed out from the leveler 8, the edging roll 41 and the restraining roll 42 need only be able to rotate freely and need not be driven.
[0015]
【Example】
The flange upsetter shown in Fig. 2 is mounted on the exit side of the leveler, and the edging roll diameter is 90mmφ and edging for the flange material with thickness of 4.5 and 6.0mm and width of 106.6mm +0.7 to 0.8mm (increment by shearing) When the present invention was carried out with a roll interval of 106.6 mm, a constraining roll diameter of 40 mm, and a constraining roll interval of the same value as the plate thickness, the shape defect was reduced by 2.0% due to the center deviation, and the perpendicularity was inferior. It was improved by 0.9%, 1.2% for poor bending, and 0.2% for torsion.
[0016]
【The invention's effect】
According to the present invention, there is a remarkable effect that it is possible to almost completely prevent a shape defect that tends to occur at the time of correcting the horizontal bending of the welded H-section steel.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an example of an equipment row of the present invention.
FIG. 2 is a main part perspective view showing a preferred example of a flange upsetter.
FIG. 3 is a schematic side view of a general production line for welded H-section steel.
FIG. 4 is an explanatory view of the deterioration of the cross-sectional shape of a welded H-section steel due to lateral bending correction.
[Explanation of symbols]
1 Welded H-section steel 2, 2A Flange material 3 Web material 4 Welding point 5 H welder 6 Coil 7 Payoff reel 8 Leveler 9 Joint welder
10 Web upsetter
11 Bead cutting machine
12 Cooling device
13 H section straightener
14 Shear
20, 20A flange
21 Straightening roll
30 web
40, 40A flange upsetter
41 Edging roll
42 Restraint roll

Claims (4)

A welded H-shape that welds and joins two flange materials and a web material, each of which is discharged from the payoff reel and level-welded, and welded to a H-shape, and further corrects the welding deformation of the welded welded H-section steel. A method for manufacturing a welded H-section steel, characterized in that the width of the two flange members is adjusted so that the difference between the widths of the two flange members becomes zero before being welded to the H-shape. A welded H-shape that welds and joins two flange materials and a web material, each of which is discharged from the payoff reel and level-welded, and welded to a H-shape, and further corrects the welding deformation of the welded welded H-section steel. In the steel manufacturing method, welding is characterized in that the width of the two flange members is adjusted so that the difference between the widths of the two flange members is set to 0 by upsetting the flange end portions before welding to the H shape. Manufacturing method of H-section steel. A welded H-shape that welds and joins two flange materials and a web material, each of which is discharged from the payoff reel and level-welded, and welded to a H-shape, and further corrects the welding deformation of the welded welded H-section steel. In the steel manufacturing equipment line, a flange upsetter that adjusts the width so that the difference between the widths of the two flange members is zero is arranged on the upstream side of the welding machine welded to the H-shaped weld H A section of manufacturing equipment for shape steel. The equipment row according to claim 3 , wherein the flange upsetter is composed of at least a pair of edging rolls for reducing the width of the flange material and at least one pair of restraining rolls for restraining both surfaces of the flange material.

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