Workpiece joining method and workpiece joined body

Abstract

To reduce cost of a jig and shorten setting time of the jig by enabling positioning even without using the jig.SOLUTION: This workpiece joining method allocates the position P of an outer shape of a first workpiece W1 cut out from a plate-like material W to the surface of the material W, forms a cut-up protrusion S inside the allocated position P of the outer shape of the first workpiece W1, cuts the position P of the outer shape of the first workpiece W1 to cut out the first workpiece W1, abuts the surface of a plate-like second workpiece W2 against the cut-up protrusion S of the cut-out first workpiece W1 to butt the end surface of the second workpiece W2 to the surface of the first workpiece W1, and welds and joins the butted part of the second workpiece W2 to the first workpiece W1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a workpiece joining method and a joined workpiece.

Background Art

[0002] Conventionally, metal plates have been butt-joined by laser welding. Patent Document 1 describes a laser welding method for joining workpieces by laser welding. In the laser welding method described in Patent Document 1, the end face of one workpiece is abutted against the surface of the other workpiece and positioned using a jig so as to be orthogonal, and the abutted portion is irradiated with a laser beam for welding.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described conventional laser welding method, since a jig is used for positioning, it is necessary to prepare a jig according to the shape of the workpiece, and there are problems that the cost of the jig and the setup time of the jig are required.

Means for Solving the Problems

[0005] In a first aspect of one or more embodiments, on the surface of a plate-shaped material, the position of the outer shape of a first workpiece cut out from the material is assigned, a raised cutting protrusion is formed inside the assigned position of the outer shape of the first workpiece, the position of the outer shape of the first workpiece is cut to cut out the first workpiece, and the surface of a plate-shaped second workpiece is brought into contact with the raised cutting protrusion of the cut-out first workpiece to abut the end face of the second workpiece against the surface of the first workpiece, and the portion where the second workpiece is abutted against the first workpiece is welded and joined. This is a workpiece joining method.

[0006] A second aspect of one or more embodiments is formed from a plate-shaped first workpiece having a raised cutting protrusion formed on its surface and a plate-shaped second workpiece welded and joined to the first workpiece. The surface of the second workpiece abuts against the raised cutting protrusion, the end face of the second workpiece abuts against the surface of the first workpiece, and the abutted portion is welded and joined. This is a workpiece joined body.

Advantages of the Invention

[0007] According to the workpiece joining method and the workpiece joined body according to one or more embodiments, positioning can be performed without using a jig, so the cost of the jig and the setup time of the jig can be reduced.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0009] [Workpiece Joining Method] Hereinafter, with reference to the drawings, the workpiece joining method according to the present embodiment will be described. FIG. 1 is a flowchart showing the steps of the workpiece joining method according to the present embodiment. As shown in FIG. 1, in step S1, the position of the outer shape of the first workpiece cut out from the material is assigned to the surface of the plate-shaped material. In a laser processing machine, a bending processing machine, or a punch laser composite machine having both functions of laser processing and bending processing, a control device such as an NC (Numerical Control) device is provided. Based on the processing program, this control device assigns the position P of the outer shape of the first workpiece W1 cut out from the material W to the surface of the plate-shaped material W as shown in FIG. 2.

[0010] In step S2, a cut-up projection S is formed inside the assigned position P of the outer shape of the first workpiece W1. The cut-up projection S is a projection formed by providing a cut-up blade at the tip of a punch and cutting up the surface of the material W. Therefore, as shown in FIG. 3, the cut-up projection S includes a recessed portion 31 recessed from the surface of the material W and a protruding portion 32 protruding from the surface of the material W.

[0011] The size of the cut-up projection S can be set according to the plate thickness of the material W. When the plate thickness is thick, the surface of the material W can be cut up deeply, so the size can be increased. On the other hand, when the plate thickness of the material W is thin, if it is cut up deeply, it will penetrate to the back surface, so it can only be cut up shallowly, and the size of the cut-up projection S needs to be reduced.

[0012] For example, in the case of FIG. 3 where the thickness of the material W is 1.0 mm, the width of the raised projection S is set to approximately 1.5 mm, and the height of the projection portion 32 is set to approximately 0.5 mm. However, in order to use the raised projection S for positioning, the height of the projection portion 32 needs to be 0.3 mm or more. Such a change in the size of the raised projection S can be realized by changing the raised blade or the lower end.

[0013] When the material W is set in the bending machine or the punch laser composite machine, as shown in FIG. 2, the control device forms the raised projection S inside the position P of the outer shape of the first workpiece W1. At this time, the raised projection S is formed at a position separated from the position P of the outer shape of the first workpiece W1 by a predetermined distance L. This predetermined distance L is the distance from the position P of the outer shape to the projection portion 32, that is, the distance between the boundary line 33 of the concave portion 31 and the projection portion 32 and the position P of the outer shape. The predetermined distance L is a value set according to the thickness of the second workpiece joined to the first workpiece W1, and the details will be described later.

[0014] Also, as shown in FIG. 2, the raised projection S is formed with a concave portion 31 facing the position P of the outer shape, and the boundary line 33 is formed parallel to the line segment indicating the position P of the outer shape. That is, the raised projection S is raised perpendicular to the line segment indicating the position P of the outer shape.

[0015] It is preferable to form at least two raised projections S with respect to one side forming the outer shape of the first workpiece W1. Since the raised projection S is used for positioning the plate-shaped workpiece as described later, by forming two with respect to one side, the plate-shaped workpiece can be accurately butted against one side.

[0016] Further, the raised projections S formed in two on one side are preferably arranged at positions close to both ends of the side, but it is necessary to arrange them so as not to get too close to the raised projections S formed on the adjacent sides. Also, when the side is long, raised projections S may be additionally formed at the center of the side. Conversely, when the side is short, only one raised projection S may be formed for one side.

[0017] In step S3, the position P of the outer shape of the first workpiece W1 is cut to cut out the first workpiece W1. When the material W is set in a laser processing machine or a punch laser composite machine, the control device irradiates the laser beam at the position P of the outer shape shown in FIG. 2 to cut, and cuts out the first workpiece W1 from the material W. However, the cutting out of the first workpiece W1 does not have to be laser cutting, and may be punching or churring.

[0018] In step S4, the surface of the plate-shaped second workpiece is brought into contact with the raised projection S of the cut-out first workpiece W1, and the end face of the second workpiece is abutted against the surface of the first workpiece W1. As shown in FIG. 4, the end face of the second workpiece W2 is abutted against the surface of the first workpiece W1 so that the surface of the previously prepared plate-shaped second workpiece W2 contacts the raised projection S formed on the first workpiece W1, and is positioned so as to be orthogonal. This positioning may be performed by the control device operating the robot arm, or may be performed manually. Also, after abutting, spot welding may be performed for temporary fixing.

[0019] Here, the predetermined distance L of the first workpiece W1 is set according to the plate thickness h of the second workpiece W2. For example, as shown in FIG. 4, when the predetermined distance L is half of the plate thickness h of the second workpiece W2, it can be welded by half drawing in the joining step described later. However, in the case of half drawing, it does not have to be half of the plate thickness h, and the predetermined distance L may be in the range of 30 to 50% of the plate thickness h. Also, as shown in FIG. 5, when the predetermined distance L is the plate thickness h of the second workpiece W2, it can be welded by single drawing in the joining step described later.

[0020] In step S5, the portion where the second workpiece W2 is abutted against the first workpiece W1 is welded and joined. The control device performs laser welding to join the portion where the second workpiece W2 is abutted against the first workpiece W1. This laser welding may be performed by the control device operating a robot arm or manually. As a result, as shown in FIG. 6, the first workpiece W1 and the second workpiece W2 are melted and joined to form a workpiece assembly 100 of an angle joint. Although the concave portion 31 of the raised projection S was formed in the first workpiece W1, it is filled with the base material during welding and disappears, leaving only the projection portion 32.

[0021] The workpiece assembly 100 shown in FIG. 6 is formed from a plate-shaped first workpiece W1 having a raised projection S formed on its surface and a plate-shaped second workpiece W2 welded and joined to the first workpiece W1. The surface of the second workpiece W2 abuts against the raised projection S, the end face of the second workpiece W2 is abutted against the surface of the first workpiece W1, and the abutted portion is welded and joined. Note that FIG. 6 shows the workpiece assembly in the case of half drawing, but the workpiece assembly can be formed in the same manner for the case of single drawing shown in FIG. 5. When the workpiece assembly 100 is thus formed, the workpiece joining method according to the present embodiment ends.

[0022] [Effects of the Embodiment] As described in detail above, in the workpiece joining method according to this embodiment, on the surface of the plate-shaped material W, the position P of the outer shape of the first workpiece W1 cut out from the material W is assigned, and the cut-up projection S is formed inside the assigned position P of the outer shape of the first workpiece W1. The first workpiece W1 is cut out by cutting the position P of the outer shape of the first workpiece W1. The surface of the plate-shaped second workpiece W2 is brought into contact with the cut-up projection S of the cut-out first workpiece W1, and the end face of the second workpiece W2 is butted against the surface of the first workpiece W1. The portion where the second workpiece W2 is butted against the first workpiece W1 is welded and joined. Thereby, when the second workpiece W2 is brought into contact with the cut-up projection S of the first workpiece W1, positioning can be performed without using a jig. Therefore, it is not necessary to prepare a jig according to the shape of the workpiece, and the time for setting the jig is also unnecessary. Thus, the cost of the jig and the time for setting the jig can be reduced.

[0023] Further, in the workpiece joining method according to this embodiment, the cut-up projection S is formed at a position separated from the position P of the outer shape of the first workpiece W1 by a predetermined distance L. Thereby, the second workpiece W2 can be accurately positioned at a position separated from the position P of the outer shape of the first workpiece W1 by a predetermined distance L. In particular, in the case of semi-autogenous welding, by adjusting the predetermined distance L, the drawing amount of the semi-autogenous welding can be easily adjusted.

[0024] Furthermore, in the workpiece joining method according to this embodiment, the predetermined distance L is the plate thickness h of the second workpiece W2. Thereby, positioning can be performed without using a jig even in the case of one-sided welding, so that the cost of the jig and the time for setting the jig can be reduced.

[0025] Also, in the workpiece joining method according to this embodiment, the predetermined distance L is half of the plate thickness h of the second workpiece W2. Thereby, positioning can be performed without using a jig even in the case of semi-autogenous welding, so that the cost of the jig and the time for setting the jig can be reduced.

[0026] Furthermore, the work assembly 100 according to the present embodiment is formed from a plate-shaped first work W1 having the raised projection S formed on its surface and a plate-shaped second work W2 welded and joined to the first work W1. The surface of the second work W2 abuts against the raised projection S, the end face of the second work W2 is butted against the surface of the first work W1, and the butted portion is welded and joined. As a result, the work assembly 100 can be manufactured without using a jig, so that the cost of the jig and the setup time of the jig can be reduced when manufacturing the work assembly 100.

[0027] As described above, embodiments of the present invention have been described, but it should not be understood that the descriptions and drawings forming a part of this disclosure limit the present invention. Various alternative embodiments, examples, and operation techniques will be apparent to those skilled in the art from this disclosure.

Explanation of Reference Numerals

[0028] 31 Recess 32 Projection 33 Boundary line 100 Work assembly h Plate thickness L Predetermined distance P Position of outer shape S Raised projection W Material W1 First work W2 Second work

Claims

1. Assign the position of the outer shape of the first workpiece cut out from the material on the surface of the plate-shaped material, Form a cut-up projection inside the assigned position of the outer shape of the first workpiece, Cut along the position of the outer shape of the first workpiece to cut out the first workpiece, Bring the surface of the plate-shaped second workpiece into contact with the cut-up projection of the cut-out first workpiece, and butt the end face of the second workpiece against the surface of the first workpiece, Weld and join the portion where the second workpiece is butted against the first workpiece Workpiece joining method.

2. The cut-up projection is formed at a position separated by a predetermined distance from the position of the outer shape of the first workpiece The workpiece joining method according to Claim 1.

3. The predetermined distance is the plate thickness of the second workpiece The workpiece joining method according to Claim 2.

4. The predetermined distance is half of the plate thickness of the second workpiece The workpiece joining method according to Claim 2.

5. A plate-shaped first workpiece with a cut-up projection formed on its surface, Formed from the plate-shaped first workpiece and the plate-shaped second workpiece welded and joined to the first workpiece, The surface of the second workpiece is in contact with the cut-up projection, the end face of the second workpiece is butted against the surface of the first workpiece, and the butted portion is welded and joined Workpiece joined body.

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