JPS62161486A - Welding method for sheet metal parts - Google Patents

Abstract

PURPOSE:To perform the welding of a sheet metal parts by remarkably saving the jig cost for positioning, by engaging two metal parts each other via the projection for positioning and the engaging hole engaged with this projection or the recess part for engaging provided respectively. CONSTITUTION:A sheet metal parts 1 and sheet metal parts 2 are assembled by engaging the both by inserting the projection 3 of a sheet metal parts 1 into the engaging hole 5 of the sheet metal parts 2. The joining can be performed at the correct position each other, therefore, by performing the welding with usual welding means in this state due to both parts 1, 2 being enabled to be located automatically. Moreover, the mechanical operation in robot becomes possible because of the projection 3 being fixed with a stud welding and the engaging hole 5 at the other part being pierced with a pressing, and the improvement in the automation rate of a body welding and the like can be expected.

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to a method for welding sheet metal parts.

b. Prior Art In general, the body of an automobile is made up of many sheet metal parts, and in order to manufacture the body, each part must be placed in the correct position relative to each other, then assembled and welded.

Conventionally, mutual positioning of sheet metal parts is performed by the following method. In other words, in the method using a welding jig, a reference pin is provided on the jig and the reference pin is inserted into a through hole of the sheet metal part, or the sheet metal part is clamped by a pair of jig supports. . In addition, when spot welding small-sized sheet metal parts and when very high precision is not required, an emboss is formed on one of the sheet metal parts, and this emboss is clamped with a wire harness.

C1 Problems to be Solved by the Invention However, the above-described conventional method of welding sheet metal parts has the following problems. In other words, the method of using a welding jig naturally requires a jig holder, and recently the price of jig holders has increased significantly, and welding jigs must be newly manufactured for each model change of the applicable vehicle, which is not economically viable. This was a significant disadvantage. On the other hand, the method of forming embossing on sheet metal parts is limited to small-sized parts and cannot be used for assembling parts that require high precision.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for welding sheet metal parts that can solve the above-mentioned problems.

d. Means for Solving the Problems In order to solve the problems of the above-mentioned prior art, the present invention provides a positioning protrusion on one of the two sheet metal parts to be assembled, and a positioning protrusion on the other. An engagement hole or an engagement recess is provided, and the protrusions of the two sheet metal parts and the engagement hole or the engagement recess are engaged and positioned with each other, and in this state, the two sheet metal parts are welded.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

1 and 2 are shown to explain one embodiment of the present invention. In the figures, 1 and 2 are sheet metal parts to be assembled, and one of the sheet metal parts formed in a plate-like body is A plurality of engagement protrusions 3 are fixed to the upper surface of the component 1 by stud welding. These protrusions 3 are connected to both parts 1.2
They are arranged in such a number as to enable accurate positioning, and are formed to be slightly longer than the thickness of the other sheet metal part 2.

Further, the other sheet metal part 2 is formed into a substantially mouth-shaped shape, and the tips 4a of both side parts 4 are bent outward at right angles.

An engagement hole 5 that engages with the engagement protrusion 3 is bored in the tip 4a, and the diameter of the engagement hole 5 is slightly larger than the outer diameter of the protrusion 3 so that the protrusion 3 can be inserted easily. It is formed.

In order to weld the sheet metal parts 1 and 2 having the above configuration, first, as shown in FIG. 1 and sheet metal part 2 are assembled. Then, since both sheet metal parts 1.2 are automatically positioned, if they are welded in this state using a conventional welding means, they will be joined to each other in the correct position.

According to this embodiment, the protrusion 3 provided on one sheet metal part l is fixed by stud welding, and the engagement hole 5 of the other sheet metal part 2 is fixed.
Since the holes are punched by press processing, robotization is possible, which is expected to improve the automation rate of body welding and other processes.

FIG. 3 is shown to explain another embodiment of the present invention, and the same members as those in the embodiment shown in FIGS. 1 and 2 are given the same reference numerals.

In the welding method of this embodiment, the sheet metal part 1 and the sheet metal part 2 are first assembled from the state shown in FIG. 3(a) to the state shown in FIG. Both assembled sheet metal parts 1.2 are automatically positioned, so
In this state, a pair of electrodes 6 for resistance welding (for example, spot welding) are placed at locations corresponding to the projections 3 and the engagement holes 5,
Fig. 3 fc sandwiching both sheet metal parts 1゜2 from above and below.
), a pair of electrodes 6 are pressed in the direction of the arrow by conventional means to crush the protrusion 3, and at the same time a large current is applied to weld.

The two sheet metal parts 1.2 are then joined to each other in the correct position.

According to this embodiment, since the protrusion 3 disappears and the welding area becomes substantially flat, workability is improved and, for example,
In the case of automobiles, it can also be used on flanges around doors and windows where there should be no protrusions. Further, there is no possibility that the protrusion 3 will hit other parts and damage them during the parts assembly work. Furthermore, since the engagement hole 5 is closed by crushing the protrusion 3, stress concentration is eliminated, the strength of the component is increased, and rust, water leakage, etc. do not occur.

The protrusion 3 is formed in such a shape that it collapses after resistance welding and becomes substantially flush with the tip 48 of the sheet metal component 2.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the embodiment described above, the projection 3 was provided on the upper surface of one of the sheet metal parts l, and the engagement hole 5 was provided on the other sheet metal part 2, but these may be replaced as shown in FIG. ,
Further, similar functions and effects can be obtained even if an engaging recess is provided instead of the retaining hole 5.

e. Effects of the invention As described above, the method for welding sheet metal parts according to the present invention includes providing a positioning protrusion on one of the two sheet metal parts to be assembled,
An engagement hole or an engagement recess that engages with the protrusion is provided on the other side, and the protrusion and the engagement hole or the engagement recess are engaged with each other to determine the position, and in this state, the two sheet metal parts are welded. , has the following effects. That is, there is no need to use a welding jig for positioning, and it is sufficient to use a minimum number of welding jigs to prevent welding distortion, so the cost of the jig can be greatly reduced. Further, when the welding method of the present invention is used, for example, for the body of an automobile, the accuracy of the body can be improved and the quality can be easily maintained and managed.

[Brief explanation of drawings]

Figures 1 and 2 are for explaining one embodiment of the sheet metal parts according to the present invention. Figure 1 is a front view showing the correspondence between two sheet metal parts to be assembled, and Figure 2 is a front view showing the relationship between the two sheet metal parts to be assembled. FIG. 3 is a front view showing the above-mentioned two sheet metal parts, and FIG. 3 is for explaining another embodiment of the sheet metal part according to the present invention, and FIG. FIG. 3 (bl is a front view showing both of the above-mentioned sheet metal parts positioned;
FIG. 3 (C1 is a front view showing both of the sheet metal parts in a welded state, and FIG. 4 is a front view showing a modification of the method for welding sheet metal parts according to the present invention. 1.2... Sheet metal parts, 3... retaining protrusions,
5... Engagement hole, 6...) Capacitive electrode. ko====Ti1 Figure 3

Claims (2)

[Claims] (1) A positioning protrusion is provided on one of the two sheet metal parts to be assembled, and an engagement hole or an engagement recess that engages with the protrusion is provided on the other, and the engagement hole or engagement recess is provided on the other side of the two sheet metal parts to be assembled. A method for welding sheet metal parts, characterized in that the mating recesses are engaged with each other for positioning, and both sheet metal parts are welded in this state. (2) Arranging a pair of welding electrodes at locations corresponding to the protrusions and engagement holes of both sheet metal parts in the positioned state,
The method of welding sheet metal parts according to claim 1, wherein both sheet metal parts are welded at the same time as the protrusion is crushed by applying pressure with the electrode.