JP2801099B2 - 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 this type of component is welded, 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 the ring-shaped projection. Japanese Patent Application Laid-Open No. Sho 60-143218, Japanese Utility Model Application Laid-Open No. 55-12
No. 2983). Furthermore, a method of performing welding work in a three-layered state through each welding protrusion, with the positions of the welding protrusions of the reinforcing base material and the auxiliary base material being abutted on each surface of the basic base material while being shifted from each other. Has been proposed (Tokuhei 3
-24311).

[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 an inner corner inside a portion in contact with one surface of the metal plate, and the second metal member has an outside corner outside a portion in contact with the other surface of the metal plate. It has a corner, and the outside diameter of the above-mentioned outside corner is set equal to or smaller than the inside diameter of the above-mentioned inside corner.

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) an inner corner formed inside a portion of the metal member that contacts the metal plate, and an inner corner that is formed outside the portion of the second metal member that contacts the metal plate and is equal to or less than the inner diameter of the inner corner; A step of clamping the metal plate material with an outer corner set to an outer diameter, and supplying a welding current using the inner corner and the outer corner as projection welding protrusions, and Welding the members coaxially and integrally via the metal plate material.

[0007]

According to the above-described welded joint and the method for welding the same according to the present invention, the first metal member is provided with an inner corner inside a portion in contact with one surface of the metal plate, while the second metal member is provided with An outer corner is provided outside a 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 a direction approaching each other, the outer diameter of the outer corner is changed to the inner corner. Since the dimensions are set to be equal to or less than the inner diameter of the portion, the outer corners and the inner corners bite into the metal plate from both sides of the metal plate. Therefore, the outer corner and the inner corner have a function as a projection welding projection. When a welding current is supplied between the outer corner and the inner corner, the first and second metal parts are formed. The members are coaxially and integrally welded together via the metal plate material.

[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 in the flange portion 18 which is in contact with one surface of the metal plate 16 has a circular inward portion. An inner corner portion 22 is formed by being cut out in a plate shape. An outer corner 26 is provided on the collar member 14 outside the flat portion 24 that is in contact with the other surface of the metal plate 16.
The outer diameter φB of the outer corner 26 is the inner diameter φ of the inner corner 22.
The size is set to be equal to or smaller than A. Specifically, as shown in FIG. 1, a gap D between the inner corner 22 and the outer corner 26 is formed.
Is 0 ≦ D ≦ 1.1t with respect to the thickness t of the metal plate 16.
Have a relationship.

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 disposed on the lower electrode 32 and the lower electrode 3
The positioning member 38 is inserted into the second 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 placed on the metal plate 16.
Is arranged. This nut member 12 is used for positioning member 3.
The positioning member 38 is moved coaxially with the collar member 14 through the position 8, and then the positioning member 38 is retracted.

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 with a predetermined pressing force P2, the inner corner 22 and the outer corner 26
The inner corner 22 and the outer corner 26 bite into the metal plate 16 from both sides of the metal plate 16 (see FIG. 3B and FIG. 4B). Accordingly, when the supply of the welding current required for welding to the lower electrode 32 and the upper electrode 34 is started (see (c) in FIGS. 3C and 4), the inner corner portion 22 and the outer corner portion 2 are provided.
6 has a function as a projection welding projection, and the inner corner portion 22, the outer corner portion 26, and the metal plate 16 are melted and welded to each other (see (d) in FIGS. 3D and 4). ).

As a specific embodiment, the outer diameter φE of the flange portion 18 of the nut member 12 is 28 mm, the inner diameter φA of the inner corner portion 22 of the nut member 12 is 24 mm, and the outer diameter φB of the collar member 14 is 23 mm. The thickness t of the metal plate 16 is set to 1.6 mm, the pressing force P1 for preliminary pressurization is 200 kgf, and the pressing force P2 for main pressurization is 80.
At 0 kgf, a welding current of 35000 A is supplied for only 0.2 seconds.

In this case, in this embodiment, the nut member 12
When the pressing force is applied in a state where the metal plate 16 is sandwiched between the nut member 12 and the collar member 14, the inner corner 22 formed on the nut member 12 and the outer corner 26 formed on the collar member 14 It penetrates both sides of the metal plate member 16 to substantially function as a projection for projection.
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, which are the welding members, is simplified at a stroke, and the welded joint is formed. The effect that the manufacturing cost of the whole 10 can be effectively reduced can be obtained.

In addition, since the accuracy of the projection itself has conventionally affected the accuracy of the product after welding, it is necessary to control the projection with high accuracy. The gap D between the metal plate 16
It is only necessary to form the inner corner portion 22 and the outer corner portion 26 so as to have a relation of 0 ≦ D ≦ 1.1t with respect to the plate thickness t. Therefore, the advantage that the accuracy control of the welded joint 10 is facilitated is obtained. If the interval D is larger than 1.1 t, the inner corner 22 may be pressed when the pressing force is applied.
The outer plate 26 and the outer corners 26 easily cause damage to the metal plate 16.

In this embodiment, the inner corner portion 22 is provided on the horizontal flat portion 20 formed on the flange portion 18 of the nut member 12, while the horizontal flat portion 2 of the collar member 14 is provided.
4, the outer corner 26 is provided. As shown in FIG. 5, the inner corner 22a is formed on the inclined portion 50 of the flange portion 18a.
Is provided on the inclined portion 52 of the collar member 14a.
6a can be provided. The inclined portion 50 is inclined by an angle θ1 with respect to one side surface of the metal plate 16, while the inclined portion 52 is inclined by an angle θ2 with respect to the other side of the metal plate 16. The angles θ1 and θ2 are preferably set in the range of 0 ° to 5 °, respectively.

[0020]

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 outer corner provided on the second metal member and the first metal member are provided. The inner corner portion cuts into the metal plate from both sides of the metal plate and has a function as a projection welding projection. For this reason, unlike the conventional case, it is not necessary to provide projections for projection welding on the metal member in advance, which facilitates precision control and simplifies the manufacturing operation of the entire welded joint at once, thereby effectively reducing manufacturing costs. Can be.

[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 partially longitudinal explanatory view of a modified example of the welded joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Welded joint 12 ... Nut member 14, 14a ... Collar member 16 ... Metal plate material 18, 18a ... Flange part 20 ... Flat part 22, 22a ... Inner corner part 24 ... Flat part 26, 26a ... Outer corner part 30 ... Welding Apparatus 50, 52 ... inclined part

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 an inner corner inward of a portion contacting one surface of the metal plate, and the second metal member has an outer edge outward of a portion contacting the other surface of the metal plate. A welded joint having a corner, wherein an outer diameter of the outer corner is set to be equal to or smaller than an inner diameter of the inner corner. 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. An inner corner formed inside a portion contacting the metal plate, and an outer diameter dimension equal to or less than the inner diameter of the inner corner formed outside a portion of the second metal member contacting the metal plate. With the set outer corner,
A step of clamping the metal plate material, supplying a welding current using the inner corner portion and the outer corner portion as projection welding projections, and coaxially and integrally forming the first and second metal members via the metal plate material. Welding the welded joint to the welded joint.