JPH02280964A - Method for joining sheet metal materials - Google Patents

Abstract

PURPOSE:To obtain a satisfactory welded result and to improve the weldability by forming rugged part to fit each other, fitting these rugged part and then, performing welding along edges thereof. CONSTITUTION:Since there is a tendency that as a gap generated on a butt part separates from the central part, it becomes larger, plural couples of recessed parts 15 and projecting parts 16 to fit each other are formed on the edges 12a and 12b in opposition of side plates 11a and 11b and besides, the positions thereof are formed on the places deviated downward from the central part of a weld zone Z. Prior to welding, the recessed parts 15 and projecting parts 16 are fitted each other and the side plates 11a and 11b are tack-welded, by which warp of the sheet metal materials is restored. As a result, a satisfactory welded state with few gaps extending over the entire area of the weld zone Z along the edges 12a and 12b is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for joining sheet metal materials, and particularly to a joining method used when forming sheet metal chains such as electrical installation panels by welding.

(Conventional technology) FIG. 15 shows two sets of side plates 1a made by bending sheet metal materials.

A conventional example is shown in which a picture body is created by forming an ib and combining these side plates 1a and 1b. That is, conventionally, the edges 2a, 2b of the side plates 1a, lb are butted against each other, and the tip of the torch 3 of a welding machine (not shown) is placed along the corner C of the butted portion, as shown in FIG. At the same time, edge 2a
, 2b were welded along the vertical direction to form a picture body 4 as shown in FIG. 17.

(Problem to be Solved by the Invention) However, according to the conventional joining means described above, for example, as shown by the two-dot chain line in FIG. The sheet metal material tends to warp due to its flatness, etc., and when the edges 2a and 2b are butted against each other, a gap δ1 is created at this butted part, and if welding is performed in this state, the gap δ1 is In large parts, there was a problem of welding defects due to "open holes" etc.

In addition, when forming the sides 1i1a and lb from sheet metal material, bending is performed after blanking, so the 18th
As shown in the figure, the perpendicularity θ between the edges (2a, 2b) that will be the welding joint surfaces formed by blanking and the bending line
There was a risk that an error would occur. For this reason, when the edges 2a and 2b are butted against each other, a gap δ is generated, especially at the bottom of the welded joint area, and when this angular error Δθ is negative, the gap δ8 is formed at the top of the welded joint area. However, there is a problem in that such a gap δ1 causes welding defects in the same way as described above.

In such cases, for example, the upper part of the welding joint area can be brought into close contact with the welding machine's clamp (not shown), but a particularly large gap tends to occur from the center to the lower part of the welding area. . This phenomenon was more pronounced as the height H of the image body was larger, that is, as the welded joint area was longer.

This invention was made to solve this problem.
The purpose is to provide a method for joining sheet metal materials that can obtain good welding results by repairing warpage in the sheet metal materials before welding, and can improve weldability.

(Means for Solving the Problems) In order to achieve the above object, in the method of the present invention, in a method for joining sheet metal materials in which opposing edges of sheet metal materials are brought together and welded, the edges include: It is characterized by forming concave and convex portions that fit into each other at positions offset from at least the center of the welded joint area, and after fitting these concave and convex portions, welding is performed along the edge. In addition, after bending the vicinity of at least one edge of the edge, the edges are butted together and welded along the abutting surface, and further, the edge After half-blanking the vicinity of one edge by shearing, the edges are abutted against each other at the half-blanked surfaces, and welded along the abutted surfaces.

(Function) With the above configuration, according to the method of the present invention, when the edges of sheet metal materials are abutted against each other and welded together along the abutting surfaces, the edges are located at a position deviated from the center of the edge (for example, By forming a plurality of sets of concave and convex portions that can fit into each other in the upper direction W), fitting these together and temporarily fixing them prior to welding, and performing welding and joining after repairing the warp of the sheet metal material by this temporary fixing. , the gap created on the butt surfaces is reduced, and a good welding result without welding defects can be obtained.

In addition, by bending the vicinity of the edge along the edge, butting these edges together, and then performing welding, the bending process increases the rigidity of the sheet metal material in the thickness direction. This has the advantage that warping is less likely to occur at the edges.

Further, by half-blanking the vicinity of the edge by shearing and processing using the bending line processed surface after bending as a reference, it is possible to reduce the perpendicularity error of the edge with respect to the bending line processed surface. At the same time, this half-blanked part increases the rigidity of the edge, so by welding the half-blanked surfaces against each other, welding defects are reduced and workability is greatly improved. .

(Example) Hereinafter, preferred examples of the present invention will be described based on the drawings.

1 and 2 show an embodiment of the method for joining sheet metal materials according to the present invention. In FIG. 1, the sheet metal material is bent to form side plates 11a and flb, and these side plates 11
The opposing edges 12a and 12b of a and llb are brought into contact and welded together to obtain the picture body 14.

Here, the characteristic feature of the method of the present invention is that uneven portions that fit into each other are formed on the edge at positions offset from at least the center of the welding joint area, and these uneven portions are fitted together. After that, welding is performed along the edge.

In this embodiment, a plurality of concave portions 15 and convex portions 16 (2 m in the figure) are formed on the opposing edges 12a and 12b of the side plates 11a and 11b to fit each other, and their positions are in the welding area 2. It is formed at a location offset downward from the center. This is because the gap created at the abutting portion tends to increase as the distance from the center increases. The uneven portions (15, 16) are fitted together prior to welding to temporarily fasten the side plates 11a and llb,
This repairs the warp in the sheet metal material. For this reason, the edge 12a.

A good butt state with a small gap can be obtained throughout the welding region Z along the line 12b.

Here, in the embodiment, the shape of the uneven portions (15, 16) is a dovetail groove shape, and the dimensional relationship is as shown in FIG. 2, as shown in FIG. 1 and the opening side length of the recess 15. It is preferable that the height of the protruding portion 16 and the groove depth h8 of the recessed portion 15 are both equal to or less than the thickness of the sheet metal material.

This is to ensure a good bonding condition at the fitting portion so as not to impair the appearance of the joint after welding.

Another embodiment of the invention is shown in FIG.

In this embodiment, the uneven portions (15-1, 16-1) on the side closer to the center of the edges 12a and 12b and the uneven portions (1
5-2, 16-2) is different from the previous embodiment in that the concave portions 15 and convex portions 16 are respectively reversely combined.

In addition, in this embodiment, the lower convex portion 16-2 is half-opened (
The state in which the sheet is extruded in the thickness direction by shearing is shown.

FIG. 4 shows an embodiment of the processing steps of the method of the invention.

That is, as shown in FIG. 4(a), first the sheet metal material 11-1 is
After blanking into the desired shape and bending as shown in Fig.
The formation of 6) is performed by press working with respect to the surface S, which serves as a reference for attaching the sheet metal material during welding, as shown in FIG. 4(C). This is to prevent misalignment between the concave portion 15 and the convex portion 16 in the height direction of the image body 14. FIG. 4(d) is a diagram showing a state in which a side plate (11a or 1lb) is formed by applying L color painting to the sheet metal material.

FIG. 5 shows another embodiment of the processing steps of the method of the invention.

According to this embodiment, as shown in FIG. 5(a), the sheet metal material 11
-2 blanking, then bending as shown in Fig. 5 (bl), and then as shown in Fig. 5 (C), the image 1
The feature is that the corner portions C5, which are the top and bottom surfaces of 4, are punched.

That is, according to an embodiment of the present invention, the edge 12a12b
By fitting the concave and convex portions (15, 16) formed in the plate, warpage of the sheet metal material can be repaired without requiring new rework.

Next, in the method of the present invention, in the method of joining sheet metal materials in which opposing edges of the sheet metal materials are brought together and welded, after bending the vicinity of at least one of the edges, the edge It is characterized in that they are butted together and welded along the abutting surfaces.

FIG. 6 shows an embodiment of the present invention, in which the vicinity of opposing edges 22a and 22b of side plates 21a and 21b to be welded and joined are respectively bent, and the end surfaces are butted against each other. Thereafter, the image body 24 is formed by welding and joining along the abutting surfaces. At this time, the bending process increases the rigidity of the side plates 21a21b in the thickness direction, making it possible to reduce warpage occurring at the edges 22a and 22b.

Therefore, the gap at the abutting portion can be reduced over the entire welding area.

Other embodiments of the invention are shown in FIGS. 7-9.

In the embodiment shown in FIG. 7, the vicinity of the opposing edges 22a-1, 22b-1 of the side plates 21a-1, 21b-1 is set at an angle of 180
An example is shown in which after bending to a point close to a, the pieces are butted against each other and welding is performed along the butted surfaces.

Further, in the embodiment shown in FIG. 8, the side plates 21a-2, 21b-
An example is shown in which the vicinity of two opposing edges 22a-2 and 22b-2 are bent to an angle of nearly 135 degrees, and then abutted against each other and welded along the abutted surfaces.

Furthermore, in the embodiment of FIG. 9, one side plate 21a-3
An example is shown in which the vicinity of the edge 22a-3 of the side plate 21b-3 is bent to an angle of nearly 135°, and then the side plate 21b-3 is butted against the edge 22b-3 of the other side plate 21b-3, and welded along the abutting surface. There is.

Note that the processing method of the present invention is shown in FIGS. 4 and 5 described above.
This is substantially the same as the figure, and can be achieved by replacing the fitting part processing step in the figure with bending of the edge.

That is, according to the embodiment of the method of the present invention, by bending the vicinity of the edge of the sheet metal material, the rigidity of the vicinity of the edge is increased, and there is no need for rework to repair warpage as in the conventional method. The gap between the butting surfaces can be reduced. Therefore, it is possible to significantly reduce welding defects caused by warpage of the sheet metal material.

Next, in the method of the present invention, in the method of joining sheet metal materials in which opposing edges of the sheet metal materials are brought into contact with each other and welded, the vicinity of at least one of the edges is half-blanked by shearing. Afterwards, the edges are butted against each other at their half-cut surfaces, and welding is performed along the abutting surfaces.

An embodiment of the present invention is shown in Fig. 1θ, in which the vicinity of the opposing edges 32a and 32b of the sides ll131a and 3tb to be welded are sheared and half-blanked to a depth of el+6 snow, respectively. The half-opened parts 35a, 35
b is formed. Then, after the surfaces P'+ and Pg, which have been subjected to the half-blanking process, are abutted against each other, they are welded and joined along the abutting surfaces to form an integral body 34, as shown in FIG.

In this case, it is preferable that the half-blanking depth el is equal to or less than the plate thickness, and the half-blanking depth el is set to el −e in consideration of the surface angle error Δθ in FIG.
By setting ++Htanθ, it becomes possible to match the half-cut surfaces.

Another embodiment of the invention is shown in FIG.

In this embodiment, the half-opened portions 35a-2, 35b-
2 is formed in the opposite direction to the above, and one half-opening part 35b-
The feature is that 2 is placed inside the integral 34. Incidentally, the dimensions e++ ei of the half-blanked portion are set in the same manner as in the embodiment shown in FIG. 1O described above.

According to this embodiment, when the opposing edges are butted against each other, the half-opened portion does not protrude to the outside, so there is an advantage that the appearance after welding and joining is beautiful.

FIG. 13 shows an embodiment of the processing steps of the method of the present invention.

That is, the sheet metal material 31-1 is blanked out in FIG. 13(a), then bent in FIG.
Figure 3 (C1 performs shearing half-blanking on the abutting surface. At this time, by performing half-blanking with the bending line processed surface Q as a reference, the squareness error in Fig. 18 described above can be reduced. Furthermore, the half-opened portions 35a and 35b formed in the edges 32a and 32b increase the cross-sectional shape in the plate thickness direction, thereby reinforcing the edges 32a and 32b and increasing the rigidity of the welding area.

FIG. 14 shows another embodiment of the processing steps of the method of the present invention. In this embodiment, the sheet metal material 31-2 is blanked as shown in FIG. 14(a), and then the sheet metal material 31-2 is blanked as shown in FIG.
After performing the bending process as shown in 1), as shown in FIG. 14(C), the corner portions C, which will become the top and bottom surfaces of the box! It is characterized by being punched out.

That is, according to the embodiment of the present invention, the half-blanked parts 35a, 35b are formed in the vicinity of the edges 32a, 32b based on the bend line processed surface Q after the bending process, so that the above-mentioned portions of the edges 32a, 32b are The perpendicularity error with respect to the bending line processing surface Q is reduced, and therefore, the gap when opposing edges are butted can be reduced.

(Effects of the Invention) As described above, the present invention provides a method for joining sheet metal materials in which opposing edges of sheet metal materials are butted against each other and welded, and in which uneven portions that fit into each other are formed on the edges, After fitting these uneven parts, welding is performed along the edges, or after bending the vicinity of the edges, the edges are butted together and welded along the butted surfaces. By processing, further, after half-cutting the vicinity of the edge by shearing,
By abutting the edges on their half-cut surfaces and performing welding along this abutting surface, we can repair the warpage of the edge of the sheet metal material before welding, or shape the edge into a shape that is less prone to warping. Alternatively, the gap between the abutting surfaces due to the bending angle error can be reduced, and a good welding result with a beautiful appearance can be obtained.

Further, since there is no need for any rework to correct warpage of sheet metal materials as in the past, weldability can be significantly improved.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the method of the present invention, showing a state in which uneven portions are formed on the edges of opposing sheet metal materials, and FIG. 2 is a diagram showing the dimensional relationship of the uneven portions. FIG. 3 is a diagram showing another embodiment of FIG. 1, and FIG. 4 (al~
(d) is a diagram showing an example of the processing process, and Figures 5 (a) to (
d) is a diagram showing another example of the processing process, FIG. 6 is a diagram showing a state in which the vicinity of the opposing edges are bent and butted together, and FIGS. 7 to 9 are diagrams showing the bending process and other Fig. 1θ is a cross-sectional view showing a state in which the vicinity of the opposing mu is half-blanked, Fig. 11 is an external view thereof,
FIG. 12 is a sectional view showing another embodiment of the 1θ diagram,
3 (a) to (a) are diagrams showing examples of processing steps in the joining method shown in FIG. 10, and FIG. 14 (a) to (d)
15 is a diagram showing another example of the processing process, and FIGS. 15 to 18 are examples of a conventional joining method for sheet metal materials, and FIG. 15 shows a case in which two sets of side plates are combined. Figure 16 is a plan view showing the state when the abutting parts are welded together, and Figures 17 and 18 are diagrams showing the state where a gap has been created in the abutting part. It is. 11-1.11-2.31-1.31-2...Sheet metal material 1a, 1b, lla, llb, 21a,
21b, 31a, 31b...Side plate 2a, 2b, 12a, 12b, 22a,
22b, 32a, 32b...Edge 4, 14.24.34--Body 15...Concavity 16...Protrusion 35a, 35b...Half Cutout part Fig. 1 Fig. 2 Fig. 3 Fig. 12 Fig. 12

Claims (3)

[Claims] (1) In a joining method for sheet metal materials in which opposing edges of the sheet metal materials are butted against each other and welded, the edges have uneven portions that fit into each other at least offset from the center of the welded joint area. 1. A method for joining sheet metal materials, characterized in that, after forming the uneven portions in positions and fitting these uneven portions, welding is performed along the edges. (2) In a method for joining sheet metal materials in which opposing edges of sheet metal materials are butted against each other and welded, the vicinity of at least one of the edges is bent, and then the edges are butted against each other, and the A method of joining sheet metal materials characterized by welding along the butting surfaces. (3) In a method for joining sheet metal materials in which opposing edges of sheet metal materials are brought together and welded, the vicinity of at least one of the edges is sheared and then the edges are welded together. 1. A method for joining sheet metal materials, characterized in that the parts are butted at half-cut surfaces and welded along the butted surfaces.