Method for producing metal component

Abstract

To enable the reliable welding of a metal tubular material with a considerably thin wall thickness to a target metal plate for welding, while avoiding the perforation of the metal tubular material.SOLUTION: A method for producing a metal component includes: a first step where a welding-side end 11p of a metal tubular material 10p with a wall thickness of 1.5 mm or less is provided with a bent protrusion 12q, which is bent outward at nearly a right angle to the axial direction of the metal tubular material 10p and protrudes outward from the outer peripheral surface 13q of the metal tubular material 10q by 1.5 mm or less; a second step where a welding-side end 11q and the bent protrusion 12q of the metal tubular material 10q are brought into contact with a target metal plate for welding 30; and a third step where the bent protrusion 12q is melted to circumferentially weld the welding-side end 11q of the metal tubular material 10q to the target metal plate for welding 30.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a metal part produced by welding metal materials. [Background technology]

[0002] Conventionally, the method of Patent Document 1 is known as a method for manufacturing a metal part by welding metal materials. In this method, a bent welded part is formed at the end of a metal sheet on the weld side by folding back the end on the weld side to increase the apparent thickness of the sheet, and the bent welded part of the metal sheet is fillet welded to a workpiece to form a metal part. It is said that by using this method, the metal sheet can be reliably welded to the workpiece without causing a meltdown phenomenon in which holes are created in the metal sheet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 2782813 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the metal sheet is relatively thick, it is possible to weld the metal sheet to the workpiece without causing a melting phenomenon by using the method of Patent Document 1, but when the metal material to be welded is quite thin, holes often form in the metal material due to the heat input during welding even when using the method of Patent Document 1. Therefore, there is a demand for a method that can reliably weld a metal material to a workpiece while preventing holes from being formed in a metal material with a very thin plate thickness.

[0005] The present invention has been proposed in consideration of the above-mentioned problems, and aims to provide a method for manufacturing metal parts that can reliably weld a metal tubular material to a metal plate to be welded while preventing holes from being created in the metal tubular material, which has a fairly thin plate thickness. [Means for solving the problem]

[0006] The manufacturing method of the metal part of the present invention is characterized by comprising a first step of forming a bent protrusion around the welding side end of a metal tube material having a plate thickness of 1.5 mm or less, the bent protrusion being bent outward at approximately a right angle to the axial direction of the metal tube material and protruding outward by a protrusion amount of 1.5 mm or less from the outer peripheral surface of the metal tube material; a second step of abutting the welding side end of the metal tube material and the bent protrusion against a metal plate to be welded; and a third step of melting the bent protrusion and circumferentially welding the welding side end of the metal tube material to the metal plate to be welded. According to this, the metal tube can be reliably welded to the metal plate to be welded while preventing holes from being formed in the metal tube, which has a relatively thin plate thickness. In addition, by melting and welding the bent protruding portion, undercuts at the welded portion can be prevented, and problems such as appearance anxiety that the weld may come off, strength reduction due to stress concentration, and accumulation of dirt due to undercuts can be eliminated. In addition, by protruding the bent protruding portion outward by an amount of protrusion of 1.5 mm or less, the welded portion can be finished neatly. In addition, since the bent protruding portion is obtained by bending the metal tube, non-filler welding is possible, and the use of welding filler is eliminated, thereby reducing manufacturing costs.

[0007] Furthermore, the method for producing a metal part of the present invention is characterized in that the metal cylindrical material has a plate thickness of 0.3 mm to 1.0 mm. This allows the metal tube material to be reliably welded to the metal plate to be welded while preventing holes from being created in the thin metal tube material, and also more reliably prevents the occurrence of undercuts at the weld points.

[0008] In addition, the manufacturing method for metal parts of the present invention is characterized in that it includes a first step of extrapolating a metal ring plate, which is made of the same material as the metal tube and has a thickness of 1.5 mm or less, into the welding side end of a metal tube material having a thickness of 1.5 mm or less, so as to protrude outward from the outer peripheral surface of the metal tube material at approximately right angles to the axial direction of the metal tube material by a protrusion of 1.5 mm or less; a second step of abutting the welding side end of the metal tube material and the metal ring plate against a metal plate to be welded; and a third step of melting the metal ring plate and circumferentially welding the welding side end of the metal tube material to the metal plate to be welded. This allows the metal tube to be reliably welded to the metal plate to be welded while preventing holes from being created in the metal tube, which has a relatively thin plate thickness. Also, by melting and welding the metal ring plate, undercuts at the welded portion can be prevented, and problems such as appearance anxiety that the tube may come off, strength reduction due to stress concentration, and accumulation of dirt due to undercuts can be eliminated. Also, by protruding the metal ring plate outward by an amount of 1.5 mm or less, the welded portion can be finished neatly.

[0009] Furthermore, the method for producing a metal part of the present invention is characterized in that the metal tube material has a plate thickness of 0.3 mm to 1.0 mm, and the metal ring plate has a plate thickness of 0.3 mm to 1.0 mm. This allows the metal tube material to be reliably welded to the metal plate to be welded while preventing holes from being created in the thin metal tube material, and also more reliably prevents the occurrence of undercuts at the weld points.

[0010] The manufacturing method of the metal part of the present invention is characterized in that in the third step, the welding side end of the metal tube is circumferentially welded to the welded metal plate by laser welding. This makes it possible to more reliably prevent holes from being formed in the thin metal tube material. Effect of the Invention

[0011] According to the method for manufacturing a metal part of the present invention, it is possible to reliably weld a metal tubular material to a metal plate material to be welded while preventing holes from being created in the metal tubular material, which has a fairly thin plate thickness. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2A is a longitudinal sectional view of a metal tube material used in the manufacturing method of the metal part according to the first embodiment. [Diagram 2] FIG. 2A is a vertical cross-sectional view of a metal tubular member having a bent protruding portion provided around its periphery in the first embodiment, and FIG. [Diagram 3] 4A is a vertical cross-sectional view of the first embodiment in which the weld-side end and the bent protrusion of the metal tube are in contact with the metal plate to be welded, and FIG. 4B is an enlarged vertical cross-sectional view of the periphery of the weld-side end. [Figure 4] 1A is a longitudinal sectional view of a metal part manufactured by the manufacturing method of a metal part according to a first embodiment, and FIG. 1B is an enlarged longitudinal sectional view of the periphery of a welded end portion of the metal part. [Diagram 5] 10A is a longitudinal sectional view of a metal tube material used in a manufacturing method for a metal part according to a second embodiment. FIG. [Figure 6] 10A is a vertical cross-sectional view of a state in which a metal ring plate is inserted around a metal tubular member in the second embodiment, and FIG. [Figure 7] 10A is a longitudinal sectional view of the second embodiment in which the weld-side end of the metal tube and the metal ring plate are in contact with the metal plate to be welded, and FIG. 10B is an enlarged longitudinal sectional view of the periphery of the weld-side end. [Figure 8] 5A is a longitudinal sectional view of a metal part manufactured by a method for manufacturing a metal part according to a second embodiment, and FIG. 5B is an enlarged longitudinal sectional view of the periphery of a welded end portion of the metal part. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] [Method for manufacturing metal part according to first embodiment] In the manufacturing method of the metal part 50 according to the first embodiment of the present invention, as shown in FIG. 1, a metal tube material 10p is used that is integrally formed of the same material and has a thickness of 1.5 mm or less. The metal tube body 10p in FIG. 1 is a cylindrical metal tube body 10p with a thickness of 0.3 mm to 1.5 mm, and the thickness of the metal tube body 10p is preferably 0.3 to 1.0 mm, more preferably 0.6 to 0.8 mm. The material of the metal tube body 10p is appropriate within an applicable range, and is preferably, for example, a magnesium alloy, aluminum, an aluminum alloy, stainless steel, titanium, or a titanium alloy. The lower end of the metal tube body 10p is a weld side end portion 11p that is welded to the welded metal plate material 30.

[0014] Then, the welded end 11p of the metal tube 10p is bent by pressing or the like to form a bent protruding portion 12q at the welded end 11q, which is bent outward at a substantially right angle to the axial direction of the metal tube 10p (see FIG. 2). The bent protruding portion 12q is formed to extend and protrude in a substantially right angle direction to the outer peripheral surface 13q of the metal tube 10q, and to protrude outward from the outer peripheral surface 13q of the metal tube 10q by a protruding amount T1 of 1.5 mm or less. The outward protruding amount T1 of the bent protruding portion 12q is preferably 0.3 to 1.0 mm, more preferably 0.6 to 0.8 mm. The thickness of the bent protruding portion 12q is approximately the same as or slightly smaller than the thickness of the metal tube 10p due to the bending deformation process.

[0015] 3, the weld side end 11q and the bent protruding portion 12q of the metal tube 10q are placed on the welded metal plate 30 formed integrally from the same material and abutted against it, and the bent protruding portion 12q is melted by welding to weld the weld side end 11q of the metal tube 10q to the welded metal plate 30 in a circumferential manner. The plate thickness of the welded metal plate 30 is appropriate, but even if the plate thickness of the welded metal plate 30 is a thin dimension corresponding to the metal tubes 10p and 10q, for example, 0.3 to 1.0 mm or 0.6 to 0.8 mm, which is 1.5 mm or less, this welding process prevents the melting phenomenon in which a hole is made in the welded metal plate 30. In addition, the welded metal plate 30 in the illustrated example is flat, but it can also be curved.

[0016] The welding method used is preferably laser welding, which allows for localized heating and allows for quick welding while also making it easy to perform localized welding. When using laser welding, for example, as shown in Figure 3, laser light L is irradiated toward the bent protrusion 12q, and the workpiece composed of the metal tube 10q and the metal plate material 30 to be welded is rotated around the axis of the metal tube 10q to perform the welding process.

[0017] The metal cylindrical body 10 and the welded metal plate material 30, which have been subjected to welding processing such as laser welding, are welded at a circumferential weld 40 formed along the circumferential weld side end portion 11, to obtain the metal part 50 shown in Fig. 4. The outer peripheral surface 41 of the weld 40 of the metal part 50, which is formed so as to melt the bent protrusion 12q, is formed in a fillet shape.

[0018] According to the first embodiment, the metal tube material 10q can be reliably welded to the metal plate material 30 to be welded while preventing holes from being formed in the metal tube material 10q, which has a fairly thin plate thickness. In addition, by melting and welding the bent protruding portion 12q, the occurrence of undercuts at the welded portion can be prevented, and the problems of appearance anxiety that appears to come off due to undercuts, strength reduction due to stress concentration, and accumulation of dust can be eliminated. In addition, by protruding the bent protruding portion 12q outward by a protruding amount of 1.5 mm or less, the finish of the welded portion 40 can be made neat. In addition, since the bent protruding portion 12q is obtained by bending the metal tube material 10p, non-filler welding is possible, and the use of welding filler is eliminated, thereby reducing manufacturing costs.

[0019] Moreover, by setting the plate thickness of the metal tubular material 10p to 0.3 mm to 1.0 mm, the metal tubular material 10q can be reliably welded to the welded metal plate material 30 while preventing holes from being formed in the thin metal tubular material 10q, and the occurrence of undercuts at the welded portion can be more reliably prevented. Furthermore, when the welding side end portion 11q of the metal tubular material 10q is circumferentially welded to the welded metal plate material 30 by laser welding, the thin metal tubular material 10q can be more reliably prevented from being holed.

[0020] [Method for manufacturing metal part according to second embodiment] In the manufacturing method of the metal part 50a according to the first embodiment of the present invention, as shown in FIG. 5, a metal tube 20p having a thickness of 1.5 mm or less is used, which is integrally formed from the same material. The metal tube 20p in FIG. 5 is a cylindrical metal tube 20p having a thickness of 0.3 mm to 1.5 mm, and the thickness of the metal tube 20p is preferably 0.3 to 1.0 mm, more preferably 0.6 to 0.8 mm. The material of the metal tube 20p is appropriate within an applicable range, and is preferably, for example, a magnesium alloy, aluminum, an aluminum alloy, stainless steel, titanium, or a titanium alloy. The lower end of the metal tube 20p is a welded side end 21p to be welded to the welded metal plate 30.

[0021] A metal ring plate 60p made of the same material as the metal tube 20p and having a thickness of 1.5 mm or less is fitted close to or in contact with the welded end 21p of the metal tube 20p so as to protrude outward from the outer circumferential surface 23p of the metal tube 20p at a substantially right angle to the axial direction of the metal tube 20p by a protruding amount of 1.5 mm or less (see FIG. 6). The metal ring plate 60p is arranged to extend and protrude in a substantially right angle direction to the outer circumferential surface 23p of the metal tube 20p, and protrude outward from the outer circumferential surface 23p of the metal tube 20p by a protruding amount T2 of 1.5 mm or less, and is disposed at the tip of the welded end 21p. The outward protruding amount T2 of the metal ring plate 60p is preferably 0.3 to 1.0 mm, more preferably 0.6 to 0.8 mm. The thickness of the metal ring plate 60p is preferably approximately the same as or slightly smaller than the thickness of the metal cylindrical member 20p, for example, preferably 0.3 to 1.0 mm, less than 1.5 mm, and more preferably 0.6 to 0.8 mm.

[0022] 7, the weld side end 21p of the metal tube 20p and the metal ring plate 60p are placed on the welded metal plate 30 integrally formed of the same material and abutted against it, and the metal ring plate 60p is melted by welding to weld the weld side end 21p of the metal tube 20p to the welded metal plate 30 in a circumferential manner. The plate thickness of the welded metal plate 30 in the second embodiment is also appropriate, but even if the plate thickness of the welded metal plate 30 is a thin dimension corresponding to the metal tube 20p, for example, 0.3 to 1.0 mm or 0.6 to 0.8 mm, which is 1.5 mm or less, the melting phenomenon in which a hole is made in the welded metal plate 30 by this welding process is prevented. The welded metal plate 30 in the illustrated example is also flat, but it can also be curved.

[0023] In the second embodiment, too, it is preferable to use laser welding as the welding method, which allows welding in a short time by localized heating and is easy to perform localized welding.When using laser welding, for example, as shown in Figure 7, laser light L is irradiated toward the metal ring plate 60p, and the workpiece consisting of the metal tube material 20p, the metal ring plate 60p, and the welded metal plate material 30 is rotated around the axis of the metal tube material 20p to perform welding.

[0024] The metal cylindrical body 20a and the welded metal plate material 30, which have been subjected to welding processing such as laser welding, are welded at a circumferential welded portion 40a formed along the circumferential weld side end portion 21a, to obtain a metal part 50a shown in Fig. 8. The outer peripheral surface 41a of the welded portion 40a of the metal part 50a, which is formed by melting the metal ring plate 60p, is formed in a fillet shape.

[0025] According to the second embodiment, the metal tube material 20p can be reliably welded to the metal plate material 30 while preventing holes from being made in the metal tube material 20p, which has a relatively thin plate thickness. In addition, by melting and welding the metal ring plate 60p, undercuts at the welded portion can be prevented, and problems such as appearance anxiety that the metal may come off, strength reduction due to stress concentration, and dirt accumulation due to undercuts can be eliminated. In addition, by protruding the metal ring plate 60p outward by an amount of protrusion of 1.5 mm or less, the welded portion 40a can be finished neatly.

[0026] Moreover, by setting the plate thickness of the metal tubular material 20p to 0.3 mm to 1.0 mm and the plate thickness of the metal ring plate 60p to 0.3 mm to 1.0 mm, the metal tubular material 20p can be reliably welded to the welded metal plate 30 while preventing holes from being made in the thin metal tubular material 20p, and the occurrence of undercuts at the welded portions can be more reliably prevented. Furthermore, when the welding side end portion 21p of the metal tubular material 20p is circumferentially welded to the welded metal plate 30 by laser welding, the thin metal tubular material 20p can be more reliably prevented from being perforated.

[0027] [Scope of the invention disclosed herein] The inventions disclosed in this specification include, in addition to the inventions and embodiments listed as inventions, those specified by changing partial contents of these to other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial effects can be obtained, and specifying them as a higher-level concept. The inventions disclosed in this specification also include the following modified examples and added contents.

[0028] For example, the welding method used in the manufacturing method of the metal part of the present invention is preferably laser welding, but a welding method other than laser welding can be used within an applicable range. Also, the metal ring plate 60p in the second embodiment is preferably made of the same material as the metal tube 20p, but can be made of a different material within an applicable range. Also, the metal tube material of the present invention can be made into a tube shape other than a cylindrical shape, and the axial length and the diameter or the dimensions of the cross section perpendicular to the axial direction of the metal tube material of the present invention are appropriate within an applicable range. [Industrial Applicability]

[0029] The present invention can be used when manufacturing metal parts by welding metal tubular members. [Explanation of symbols]

[0030] 10, 10p, 10q... Metal tube material 11... 11p, 11q... Welding side end 12q... Bend protrusion 13q... Outer peripheral surface 20a, 20p... Metal tube material 21a, 21p... Welding side end 23p... Outer peripheral surface 30... Metal plate material to be welded 40, 40a... Welding portion 41, 41a... Outer peripheral surface 50, 50a... Metal part 60p... Metal ring plate T1... Outer protrusion amount of bent protrusion T2... Outer protrusion amount of metal ring plate L... Laser light

Claims

1. A first step of providing a bent protruding portion at a welded end of a metal tubular material having a plate thickness of 1.5 mm or less, the bent protruding portion being bent outward at a substantially right angle to an axial direction of the metal tubular material and protruding outward by a protruding amount of 1.5 mm or less from an outer peripheral surface of the metal tubular material; a second step of contacting the weld side end portion and the bent protrusion portion of the metal tube material with a metal plate material to be welded; and a third step of melting the bent protrusion and circumferentially welding the welding side end of the metal tube to the welded metal plate.

2. 2. The method for manufacturing a metal part according to claim 1, wherein the metal tube material has a plate thickness of 0.3 mm to 1.0 mm.

3. A first step of extrapolating a metal ring plate having a thickness of 1.5 mm or less and made of the same material as the metal tube body and having a thickness of 1.5 mm or less onto a welded end portion of a metal tube material having a thickness of 1.5 mm or less, in close proximity to or in contact with the metal ring plate so as to protrude outward from an outer peripheral surface of the metal tube material at a right angle to an axial direction of the metal tube material by a protrusion amount of 1.5 mm or less; a second step of contacting the weld side end of the metal tube material and the metal ring plate against a metal plate material to be welded; and a third step of melting the metal ring plate and circumferentially welding the welding side end of the metal tube material to the welded metal plate material.

4. 4. The method for manufacturing a metal part according to claim 3, wherein the thickness of the metal tube material is 0.3 mm to 1.0 mm, and the thickness of the metal ring plate is 0.3 mm to 1.0 mm.

5. 5. The method for manufacturing a metal part according to claim 1, wherein in the third step, the weld side end of the metal tube is circumferentially welded to the welded metal plate by laser welding.

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