JP2801097B2 - Welded joint and welding method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welded joint in which a metal plate is interposed between two metal members and the two metal members are coaxially and integrally welded to each other via the metal plate. Related to welding method.

[0002]

2. Description of the Related Art For example, in an automobile part, a metal plate is interposed between two metal members such as a nut member and a collar member, and the two metal members are coaxially and integrally formed through the metal plate material. There are various types that are formed by welding. When welding this kind of parts, projection welding is generally performed, for example, a ring-shaped projection is provided on a welding joint surface of a work, and welding work is performed via this ring-shaped projection. (Japanese Patent Laid-Open No. 60-143218, Japanese Utility Model Application Laid-Open No. 55-1229).
No. 83 publication). In addition, for each side of the base material,
A method has been proposed in which welding projections of a reinforcing base material and an auxiliary base material are brought into contact with each other with their positions shifted from each other, and a three-ply welding operation is performed via each welding projection (Japanese Patent Publication No. 3-2).
No. 4311).

[0003]

However, in the above-mentioned prior art, a problem has been pointed out that a ring-shaped or a plurality of projections must be provided in advance on the work, and the production cost of this kind of work increases. . In addition, if the heights of the projections are not uniform, the two metal members cannot be maintained coaxially after welding. For this reason, it is necessary to manage the projections with high precision, and there is a problem that the operation becomes complicated.

The present invention solves this kind of problem, and it is not necessary to previously provide projections for projection welding on two metal members and a metal plate interposed therebetween, thereby facilitating the welding operation. While being able to
It is an object of the present invention to provide a welded joint capable of effectively preventing an increase in cost and a welding method thereof.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a first metal member, a second metal member, and a metal member interposed between the first and second metal members. With a metal plate material for coaxial and integral welding connection,
The first metal member has a tapered portion inclined in a direction away from the metal plate inside a portion in contact with one surface of the metal plate, and the second metal member is the other of the metal plate. An outer corner portion is provided outside a portion in contact with a surface, and a position of the outer corner portion is set so as to correspond to a range of the tapered portion.

Further, according to the present invention, there is provided a step of interposing a metal plate between a first metal member and a second metal member, and pressing the first and second metal members in directions approaching each other, (1) A tapered portion formed inside a portion of the metal member contacting the metal plate and inclined in a direction away from the metal plate, and an outside formed outside a portion of the second metal member contacting the metal plate. A step of clamping the metal plate between the corners, and supplying a welding current between the tapered portion and the outer corner to coaxially and integrally form the first and second metal members via the metal plate. And a step of selectively welding and joining.

[0007]

In the above-described welded joint and the method for welding the same according to the present invention, the first metal member has a tapered portion inclined in a direction away from the metal plate inside the portion in contact with one surface of the metal plate. On the other hand, the second metal member is provided with an outer corner outside the portion in contact with the other surface of the metal plate. For this reason, after the metal plate is interposed between the first and second metal members, when the first and second metal members are pressed in directions approaching each other, the metal plate is deformed and the tapered portion is formed. While engaging with one surface of this metal plate material, an outer corner part bites into the other surface side of this metal plate material. Therefore, the outer corner portion has a function as a projection welding projection, and when a welding current is supplied between the outer corner portion and the tapered portion, the first and second metal members intervene via the metal plate. Therefore, they are coaxially and integrally welded.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a welded joint and a welding method according to the present invention.

In FIG. 1 and FIG.
Shows a welded joint according to the present embodiment. The welded joint 10 is provided with a metal nut member (first metal member) 12, a metal collar member (second metal member) 14, and interposed between the nut member 12 and the collar member 14. A metal plate material 16 for coaxially and integrally welding and joining.

A large-diameter flange portion 18 is provided at an end of the nut member 12, and a flat portion 20 of the flange portion 18 which is in contact with one surface of the metal plate member 16 has a frusto-conical shape inside thereof. And a tapered portion 22 is formed which is notched in the direction away from the metal plate 16. An outer corner 26 is provided on the collar member 14 outside the flat portion 24 in contact with the other surface of the metal plate 16.
The position 6 corresponds to the range H of the tapered portion 22.

A through hole 28 is formed in the center of the collar member 14 and the through hole 28 is formed in the metal plate 16.
A hole 29 is formed corresponding to.

FIG. 2 shows a welding apparatus 30 for performing a welding process on the welded joint 10. This welding device 30
Is a lower electrode 32 on which the end of the collar member 14 is disposed.
And an upper electrode 34 for pressing the nut member 12 downward. An opening 36 formed in the lower electrode 32 includes
The positioning member 38 is provided so as to be able to advance and retreat.

Next, the welded joint 1 constructed as described above will be described.
The method of welding 0 will be described with reference to FIGS.

First, as shown in FIG. 2, the collar member 14 is arranged on the lower electrode 32, and the lower electrode 32
The positioning member 38 is inserted into the opening 36 and the through hole 28 of the collar member 14. The metal plate 16 is disposed on the flat portion 24 of the collar member 14 with the holes 29 corresponding to the through holes 28, and the nut member 12 is disposed on the metal plate 16. The nut member 12 includes a positioning member 38
, And is positioned coaxially with the collar member 14, and then the positioning member 38 retreats.

Next, the upper electrode 34 is connected to the nut member 12.
The upper electrode 34 and the lower electrode 32 are pre-pressed with a predetermined pressing force P1 in a direction approaching each other (see (a) in FIGS. 3A and 4).
Further, when the upper electrode 34 and the lower electrode 32 are fully pressed at a predetermined pressing force P2, the tapered portion 22 and the metal plate 1
6, a gap is formed between the metal plate 1
6 is deformed so that the tapered portion 22 is engaged with one surface of the metal plate 16, and the outer corner 26 is
(FIG. 3b and FIG. 4, (b)
reference). Accordingly, when the supply of the welding current required for welding to the lower electrode 32 and the upper electrode 34 is started (FIG. 3C).
And (c) in FIG. 4), the outer corner 26 has a function as a projection welding projection,
The tapered portion 22, the outer corner portion 26 and the metal plate material 16
Are melted and welded to each other (in FIG. 3 d and FIG. 4,
(D)).

As specific examples, the outer diameter φE of the flange portion 18 of the nut member 12 is 28 mm, the outer diameter φB of the collar member 14 is 23 mm, and the thickness t of the metal plate 16 is
1.6 mm, pressing force P1 for preliminary pressurization = 200 kgf, pressing force P2 for main pressurization = 800 k
gf, a welding current of 27000 A is supplied for only 0.2 seconds.

In this case, in this embodiment, the nut member 12
When a pressing force is applied in a state where the metal plate 16 is held between the metal member 16 and the collar member 14, the metal plate 16 is deformed, and the tapered portion 22 of the nut member 12 engages with one surface of the metal plate 16. At the same time, the outer corner 26 of the collar member 14 cuts into the other surface of the metal plate 16,
Substantially has a function as a projection for projection welding. For this reason, as compared with the conventional method in which a ring-shaped projection or a plurality of projections for projection welding are provided in advance, the manufacturing operation of the nut member 12 and the collar member 14 as the welding members is simplified at a stroke, and the welded joint The effect that the manufacturing cost of the whole 10 can be effectively reduced can be obtained.

In addition, in the present embodiment, it is necessary to control the protrusions with high precision because the accuracy of the protrusions has conventionally affected the accuracy of the product after welding. It is only necessary to set the position within the range H of the tapered portion 22. This is because when the pressing force is applied to the nut member 12 and the collar member 14, the tapered portion 22 functions as a receiver for the outer corner portion 26, and the metal plate 16
This is because the breakage of the can be effectively prevented. Therefore, the advantage that the accuracy control of the welded joint 10 is facilitated is obtained.

Next, a welded joint 10a according to another embodiment is described.
10 to 10c are shown in FIG. 5 to FIG. In addition, the same components as those of the above-described welded joint 10 are denoted by the same reference numerals, and the detailed description thereof is omitted.

As shown in FIG. 5, in the welded joint 10a, a tapered portion 22a is directly formed without providing a flat portion at the end of the flange portion 18a of the nut member 12a.

In the welded joint 10b shown in FIG. 6, similarly to the welded joint 10a, the flange portion 18 of the nut member 12b is provided.
The tapered portion 22b is directly provided from the end of the collar member 14b, and the inclined portion 50 is formed from the outer corner 26b without providing a flat portion at the end of the collar member 14b in contact with the metal plate 16b.

Further, in the welded joint 10c shown in FIG. 7, unlike the above welded joints 10, 10a and 10b, the outer diameter of the nut member 12c is set smaller than the outer diameter of the collar member 14c. For this reason, the outer corner portion 52 in contact with the metal plate member 16c is provided on the outer peripheral portion of the nut member 12c.
Is provided, and the metal plate material 16 of the collar member 14c is provided.
A tapered portion 54 that inclines inward is formed at an end portion that is in contact with c.

The method of welding the welded joints 10a to 10c thus configured is the same as that of the welded joint 10 described above, and the respective effects are also the same.

[0024]

According to the welded joint and the method for welding the same according to the present invention, the following effects can be obtained.

When a pressing force is applied after the metal plate is interposed between the first and second metal members, the tapered portion of the first metal member engages with one surface of the metal plate and The outer corners of the second metal member bite into the other surface of the metal plate, and function as projection welding projections. Therefore, as before,
There is no need to provide projections for projection welding on the metal member in advance, and accuracy control is facilitated, and the manufacturing operation of the entire welded body is simplified at a stroke, so that manufacturing costs can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal sectional view illustrating a welded joint according to the present invention.

FIG. 2 is a longitudinal sectional view of the welding assembly and the welding device.

FIG. 3 is a schematic explanatory view of a welding method of the welded joint.

FIG. 4 is an explanatory diagram of pressurization and energization timing of the welding method.

FIG. 5 is a partial longitudinal sectional view illustrating a welded joint according to another embodiment.

FIG. 6 is a partial longitudinal sectional view of a welded joint according to another embodiment.

FIG. 7 is a partial longitudinal sectional view of a welded joint according to still another embodiment.

[Explanation of symbols]

 10, 10a to 10c: welded joint 12, 12a to 12c: nut member 14, 14a to 14c: collar member 16, 16a to 16c: metal plate 18, 18a to 18c: flange portion 22, 22a, 22b: tapered portion 26 , 26a, 26b ... outer corner portion 30 ... welding device 52 ... outer corner portion 54 ... taper portion

Claims (2)

(57) [Claims] A first metal member, a second metal member, and a metal plate interposed between the first and second metal members and coaxially and integrally welded to each other; The first metal member has a tapered portion inclined in a direction away from the metal plate inside a portion in contact with one surface of the metal plate, and the second metal member is the other of the metal plate. A welded joint having an outer corner portion outside a portion in contact with a surface, wherein a position of the outer corner portion is set corresponding to a range of the tapered portion. 2. A process of interposing a metal plate between a first metal member and a second metal member, and pressing the first and second metal members in a direction approaching each other to form a first metal member. A tapered portion formed inside a portion contacting the metal plate material and inclined in a direction away from the metal plate material, and an outer corner formed outside a portion of the second metal member contacting the metal plate material. , A step of clamping the metal plate material, supplying a welding current between the tapered portion and an outer corner,
Welding the first and second metal members coaxially and integrally via the metal plate material.