JPH0910955A - Welding projection structure - Google Patents

Abstract

PURPOSE: To surely realize prescribed projection welding even when curvatures between both members do not always coincide at the time of the projection welding of a member with a curved recessed surface and a member with a curved projecting surface. CONSTITUTION: The welding projection structure is constituted of two-stage projections consisting of support projecting parts 11 on which plural weld projections 10 arranging at proper intervals along the curve direction of a curved recessed surface 1b are formed on the curved recessed surface 1b in trapezoid shapes having top parts with proper areas and welding projecting parts 12 formed in tenon shapes, which project to proper heights and are provided successively on the top parts of the support projecting parts 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding projection structure, and more particularly to an improvement in a welding projection structure suitable for use in projection welding a member having a curved concave surface to a member having a curved convex surface.

[0002]

2. Description of the Related Art In the case of projection welding a member having a curved concave surface to a member having a curved convex surface, for example, as shown in FIG. 4, a hydraulic shock absorber SA for vehicle body mounting is used.
When the projection welding of the hose bracket 1 is performed in the vicinity of the lower end of the hose bracket 1, the projection welding forms the curved main body portion 1a of the hose bracket 1 and the hydraulic shock absorber SA, as indicated by symbol P in the drawing. It is executed with the outer cylinder 2.

In this case, as shown in FIG. 5, the welding projection 1c formed on the curved concave surface 1b of the main body 1a is accurately brought into contact with the outer peripheral surface 2a of the outer cylinder 2, that is, the curved concave surface. 1
It is necessary that the curvature at b and the curvature at the outer peripheral surface 2a match.

However, when the curvature of the curved concave surface 1b and the curvature of the outer peripheral surface 2a do not match due to various reasons such as diverting another hose bracket 1 prepared for another hydraulic shock absorber, etc. , The predetermined projection welding cannot be realized.

That is, for example, as shown in FIG. 6, when the curvature of the outer peripheral surface 2a is larger than that of the curved concave surface 1b,
Alternatively, as shown in FIG. 7, when the curvature of the curved concave surface 1b is larger than that of the outer peripheral surface 2a, before the welding projection 1c is melted by projection welding and becomes a completely welded state, The surface 2a and the curved concave surface 1b come into contact with each other, and a so-called contact point X other than the portion of the welding projection 1c appears separately there.

Therefore, the welding current for projection welding in the original welding projection 1c portion also flows through the contact point X. Therefore, the welding current in the welding projection 1c portion is insufficient, and the welding projection 1c is insufficient. Cannot be completely melted, and as a result, predetermined projection welding cannot be realized.

In order to solve the above-mentioned inconvenience, it is sufficient to prepare the hose brackets 1 each having a curvature that matches the curvature on the hydraulic shock absorber side for each product. In that case, Of course, the hose bracket 1 for each minutely different curvature must be prepared as a component, and as a result, component management is essential.
Along with the fact that the so-called diversion is not required to be positively performed, it becomes difficult to reduce the product cost of the hydraulic shock absorber for vehicle bodywork, and there is a fear that improvement in versatility cannot be expected.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to perform projection welding between a member having a curved concave surface and a member having a curved convex surface between the members. It is an object of the present invention to provide a welding projection structure that is optimal for surely realizing a predetermined projection welding even if the curvatures do not necessarily match.

[0009]

In order to achieve the above-mentioned object, the structure of the present invention has a plurality of welding projections which are arranged on a curved concave surface at appropriate intervals along the curved direction of the curved concave surface. In a welding protrusion structure having, a welding protrusion has a support protrusion formed in a trapezoidal shape having an appropriately wide top portion, and a tenon shape continuously connected to the top portion of the support protrusion portion and protruding to an appropriate height. It is assumed that it is a two-step projection consisting of the formed welding projection.

It is preferable that the top of the supporting projection, which is the remaining portion of the welding projection by providing the welding projection, be set to a flat surface or an inclined surface having an angle with the slope of the welding projection.

[0011]

Therefore, in the welding projection structure, since the welding projection is a two-step projection including the support projection and the welding projection, the reference surface which is the curved concave surface on which the welding projection is formed. The dimension between the welding projection and the top of the welding projection can be set larger by the height of the support projection.

On the other hand, at the time of projection welding, the welding protrusion is melted, but the top of the supporting protrusion, which is the remaining portion by providing the welding protrusion, forms an angle with the slope of the welding protrusion. With the surface having the above, the apparent area of the welding protrusion is rapidly increased after the welding protrusion is melted.

As a result, the melting of the supporting protrusion requires a melting current larger than that for melting the welding protrusion, and therefore, the melting of the welding protrusion does not reach the supporting protrusion as it is and the supporting protrusion is melted. The melting of the weld protrusion is stopped at.

Therefore, at the time when the desired projection welding is completed by melting the welding projection, even if there is a difference in curvature between the curved concave surface and the curved convex surface opposite to this, contact between both surfaces is prevented. It is possible and does not allow another contact to appear between both sides.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on the illustrated embodiments, but the welding projection structure according to the present invention also bends the hose bracket 1 which is a member having a curved concave surface, like the above-mentioned conventional example. It is most suitable for use in projection welding to the lower end of the hydraulic shock absorber SA that is a member having a convex surface (see FIG. 4).

That is, in this embodiment, the projection welding is performed between the curved main body portion 1a of the hose bracket 1 and the outer cylinder 2 constituting the hydraulic shock absorber SA, as shown in FIG. Therefore, the plurality of welding projections 10 are arranged on the curved concave surface 1b of the main body portion 1a of the hose bracket 1 at appropriate intervals along the curved direction of the curved concave surface 1b.

In the present invention, the welding projection 10 is a two-step projection consisting of a support projection 11 and a welding projection 12, as shown in FIG. ing.

The support protrusion 11 has a top 11a having an appropriate width.
And is formed to have a so-called base portion for supporting the welding projections 12.

The welding projection 12 is formed on the top 11a of the support projection 11 integrally with the support projection 11 and is formed in a tenon shape projecting at an appropriate height. Is provided to form a so-called fused portion of

The above-mentioned two-step projection, that is, the support projection 11
Regarding the formation of the welding protrusion 12 and the welding projection 12 on the curved concave surface 1b, any measure may be selected, but it is preferably formed by press working from the curved convex surface 1d side opposite to the curved concave surface 1b, Further, the shape at that time may also be set so that the plane shape is circular as shown in FIG. 3 (A), and further, the plane shape may be long as shown in FIG. 3 (B). It may be set to have a circular shape.

The top portion 11a has such an area that, when the welding projection 12 is melted by the melting current at the time of projection welding, it cannot be melted without a considerably large melting current. Is set.

Further, since the welding projection 12 forms a so-called contact point during projection welding, it is preferable to set the tip, which is the upper end in FIG. 2, to be a point. Further, the welding projection 12
It is preferable to set an appropriate angle between the slope and the top 11a.

If the above setting is made,
After the welding protrusion 12 is melted with a predetermined melting current, the area of the welding protrusion 12 is suddenly increased apparently because the support protrusion 11 has the apex of an appropriate width, and therefore, As long as there is no melting current equal to or higher than the above melting current, melting of the welding projection 12 is stopped there.

Therefore, in the illustrated example, the welding projection 12
The top 11 of the support protrusion 11 that is left by providing
As shown on the left side of FIG. 2, a is set to be a flat surface between the slope of the welding projection 12 and the flat surface.
As shown by the broken line diagram on the right side of the inside, it may be set to an inclined surface having an appropriate angle with the inclined surface of the welding projection portion 12.
That is, the so-called continuous melting is set.

In the welding projection structure according to this embodiment formed as described above, since the welding projection 10 is a two-step projection including the support projection 11 and the welding projection 12, the support projection is formed. The dimension between the reference surface, which is the curved concave surface 1a where the portion 11 is formed, and the top of the welding projection 12, that is, the height dimension of the welding projection 10 is defined as the welding projection in the conventional welding projection structure of this kind. As compared with 1c (see FIG. 5), the height can be set larger by the height of the support protrusion 11.

On the other hand, at the time of projection welding, the welding projection 12 is melted, but the top 11a of the support projection 11 which is left by providing the welding projection 12 is the welding projection. By forming a surface having an angle with the inclined surface of 12, after the welding protrusion 12 is melted,
Apparently, the area of the welding projection 12 rapidly increases.

As a result, the melting of the supporting protrusions 11 requires a melting current larger than that for melting the welding protrusions 12, so that the melting of the welding protrusions 12 cannot reach the supporting protrusions 11 as they are, and therefore The melting of the welding protrusion 12 is stopped at the support protrusion 11.

Therefore, when the desired projection welding is completed after the welding projection 12 is melted, it is assumed that between the curved concave surface 1b of the hose bracket 1 and the outer peripheral surface 2a of the outer cylinder 2 which is the curved convex surface facing the curved concave surface 1b. Even if there is a difference in curvature, contact between both surfaces can be prevented, and another contact point X (see FIGS. 6 and 7) will not appear between both surfaces.

The above description has been made by taking the case where the hose bracket 1 is projection-welded to the outer cylinder 2 which constitutes the hydraulic shock absorber as an example, but from the point of the present invention, a curved concave surface is formed. As long as projection welding is performed on the member having the member and the member having the curved convex surface facing the member having the member, it is possible to perform the operation even between other members, and in that case, the same action as that described above is obtained. Of course, the effect can be expected.

[0030]

As described above, according to the present invention, since the welding projection is a two-step projection composed of the support projection and the welding projection, the entire height of the welding projection is Compared with the case where it consists of only the protrusions, it can be set larger by the height of the supporting protrusions, and the welding protrusions are melted during projection welding using the welding protrusions. However, the melting of the welding protrusions is stopped before reaching the supporting protrusions, and therefore, at the time when the welding protrusions are melted and the desired projection welding is completed,
Even if there is a difference in curvature between the curved concave surface and the curved convex surface facing the curved concave surface, it is possible to always realize the predetermined projection welding without blocking the contact of both surfaces and causing another contact to appear between both surfaces. Become.

Further, according to the present invention, it becomes possible to form the welding projections, which are the two-step projections, by press working from the curved convex surface side opposite to the curved concave surface where the welding projections are arranged, and In this case, there is an advantage that the forming work can be performed together with forming the curved concave surface.

As a result, according to the present invention, a member having a curved concave surface, for example, a hose bracket and a member having a curved convex surface, for example, an outer cylinder constituting a hydraulic shock absorber, is subjected to projection welding between the two members. Even if the curvatures at the positions do not necessarily match, it is optimal for surely realizing the predetermined projection welding.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a partially welded projection structure according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing linearly a welding projection according to an embodiment of the present invention.

FIG. 3 (A) is a perspective view showing the welding projection of FIG. 2.

FIG. 3 (B) is a perspective view showing a welding projection of another embodiment.

FIG. 4 is a partial perspective view showing the hydraulic shock absorber with a hose bracket held by projection welding.

FIG. 5 is a view showing a conventional welding protrusion structure as in FIG.

FIG. 6 is a view showing an embodiment of a conventional welded protrusion structure as in FIG.

FIG. 7 is a view showing another embodiment of the conventional welded projection structure, similarly to FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hose bracket which is a member having a curved concave surface 1a A curved main body portion 1b A curved concave surface 2 An outer cylinder which constitutes a hydraulic shock absorber which is a member having a curved convex surface 2a Outer peripheral surface 10 Welding projection 11 Supporting projection 11a Top 11b Inclined surface 12 Welding projection Department SA hydraulic shock absorber

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[Procedure amendment]

[Submission date] November 10, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Title of invention Welding protrusion structure

Claims (2)

[Claims] 1. A welding projection structure comprising a curved concave surface and a plurality of welding projections arranged at appropriate intervals along a curved direction of the curved concave surface, wherein the welding projection has an appropriately wide top portion. Welding projection structure comprising a two-step projection having a support projection formed in a trapezoidal shape and a welding projection formed in a tenon shape that is connected to the top of the support projection and projects to an appropriate height 2. A support projection, which is the remaining portion of the welding projection by providing the welding projection, has a flat surface or an inclined surface having an angle with the slope of the welding projection. Item 1 weld projection structure