JP2824729B2 - Positioning method in projection welding etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for positioning a steel plate part on a fixed electrode by projecting welding a part held by a movable electrode to a steel plate part. It is used when a component is held by hand and placed on a fixed electrode. And
This method can be used not only in projection welding but also in the fields of stud welding and arc welding.

[0002]

2. Description of the Related Art For example, in the case of projection welding, there is Japanese Utility Model Laid-Open No. 62-86979 as a prior art. What is disclosed here is a type in which a projection nut is placed on a fixed electrode, a steel plate component is placed on the upper side, and then the movable electrode advances, and the relative position between the projection nut and the steel plate component is set. In order to set the position, a thin rod-shaped pointing member contacts the steel plate part from diagonally above to find the hitting position, retreats the pointing member, the operator advances the movable electrode while maintaining this state, and performs projection. Complete the welding. Also, JP-A-63-183
No. 783 discloses placing a large steel plate part on a fixed electrode.
When the fixed electrode is
Illuminate the area with an irradiating means.
ing. Further, Japanese Utility Model Application No. 1-42952 (Japanese Utility Model Application No.
No. 138079) has a positioning pin
The steel plate part whose position is determined by the
Welding with light emitted from a light emitting device installed at a predetermined position
To detect the hitting position, hitting deviation, hitting defect, etc.
is there.

[0003]

THE INVENTION It is a problem to be solved point] of the above-mentioned Japanese Utility Model 62-
In the prior art as disclosed in Japanese Patent No. 86979 , the pointing member itself advances and retreats between the two electrodes. Therefore, depending on the operation mistake, the movable electrode advances to the place where the indicating member advances, and the indicating member May be damaged. In addition, it is necessary to provide a driving means such as an air cylinder for moving the pointing member forward and backward, which is not preferable because it is mechanically complicated. Further, the technique disclosed in Japanese Patent Application Laid-Open No. 63-183783 is disclosed.
Then, the position of the fixed electrode is displayed on the steel plate part,
The relative position between the constant electrode and the steel plate part is unknown. Accordingly
To determine where to hit the spot on the steel plate part
Indicates that the worker has some reference, for example, the edge of a steel plate part.
It is necessary to set the hitting position by the amount of the eye. like this
Finding the right RBI is tiring for the worker,
Also, if the watch is a little careless, the position of the spot
Cause. Similarly, the project
When welding section nuts,
Place the nuts exactly where they are
Problem. Further disclosed in the above microfilm
Is the relative position between the positioning pin and the light emitting device.
Location must be accurately determined,
It is necessary to prepare highly accurate jigs
This is disadvantageous in equipment production. If this
If the relative position is wrong, the hitting position will be wrong and welding failure will occur.
Will imitate.

[0004]

[Means for Solving the Problems and Their Functions] The present invention has been proposed to solve the above-mentioned problems.
In the case of welding a part held by a movable electrode to a steel plate part on a fixed electrode, irradiating means for irradiating a central part of the fixed electrode is installed, and a welding position display mark previously attached to the steel plate part is irradiated by the irradiating means. By irradiating, the relative position between the fixed electrode and the steel plate part is set, and the movable electrode is advanced in a state where the mark is irradiated, thereby completing the projection welding or the like.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a description will be given with reference to FIGS. 1 to 5. The welding method here is a case of projection welding, in which a fixed electrode 1 and a movable electrode 2 are arranged on a coaxial line, and the fixed electrode 1 is a stationary member. The movable electrode 2 is connected to a driving means (not shown) such as an air cylinder. The component in this embodiment is the case of the projection bolt 4, and the bolt is composed of a shaft portion 5, a flange portion 6, and a welded portion 7 formed by protruding the flange portion. An accommodating hole 8 is formed in the movable electrode 2, and a magnet 9 is provided at the back of the accommodating hole 8. The bolt 4 has the shaft 5 inserted into the housing hole 8 and is held by the movable electrode 2 by the attraction of the magnet 9. Instead of the magnet 9, an elongated plate spring may be provided in the inner surface of the housing hole 8 in the axial direction to elastically hold the shaft portion 5. The insertion of the shaft portion 5 into the accommodation hole 8 may be manually performed by an operator, but the supply rod 10 as shown by a two-dot chain line is illustrated.
Are operated as indicated by arrows 11 and 12. Mounted on the fixed electrode 1 is a steel plate part 13 that is manually held by an operator.

Irradiation means 1 for irradiating the center of fixed electrode 1
4, the irradiating means may be a combination of a light source and a lens for irradiating the center of the end face of the movable electrode 1 as shown in FIG. 4, and reference numeral 15 in the figure indicates a partially brightly illuminated irradiation mark. It is closing. Reference numeral 16 denotes an optical axis. The irradiating means may use a projector of a photoelectric sensor, or may use a laser beam. It is appropriate to select the color of the lens so that the irradiation mark 15 becomes red or blue so that the operator can easily determine the color.

In FIG. 2, three welding position display marks 17 are provided on the steel plate part 13. The display mark 17 may be a small depression 18 formed by a punch as shown in FIG. 3 or a method of drawing a small dot with a coloring agent.

The work method will be described. When an operator holds the steel plate part 13 by hand and puts it on the fixed electrode 1, the irradiation mark 15 is illuminated on the surface of the steel plate part 13 and the steel plate part 13 is illuminated.
Is moved so that the display mark 17 matches the mark 15, the relative position between the fixed electrode 1 and the steel plate part 13 is set. That is, the result is as shown in FIG. Thereafter, the movable electrode 2 is advanced, and the welded portion 7 is welded to the position of the display mark 17.

The projection bolt 4 shown in FIG. 6 has three or four welding projections 19 instead of the above-mentioned welding portion 7.
It is a case where is adopted. FIG. 7 shows a case where a projection nut 21 having a projection 20 for welding is held on the movable electrode 2. The nut 21 is held in a recess formed in the end face of the electrode 2. A cover plate 22 is provided, and a magnet 23 is buried in the cover plate 22. In the case of this nut, similarly to the case of the above-described bolt 4, projection welding is performed in a state as shown in FIG.

The above embodiment is directed to the case of projection welding. However, the problem of accurately determining the relative position between a fixed electrode and a steel plate part and correctly welding the part to a predetermined portion of the steel plate part is stud welding. And arc welding as well. Embodiments of stud welding and arc welding are the same as in the case of projection welding, and are not shown.

[0011]

According to the method of the present invention, the movable electrode is held by the movable electrode.
It is assumed that the part is welded to the steel part on the fixed electrode.
Illuminate the center of the fixed electrode
Welding means are installed, and the welding position is
By irradiating the position indication mark with the irradiation means,
The relative position between the constant electrode and the steel plate part has been set.
Therefore, the pointing member, which is a movable member as in the prior art, is not required, and the above-described problem is reliably solved. In addition, since the operator only needs to perform simple alignment as shown in FIG. 5, the work is simple and the work fatigue is minimized.
The relative position between the steel plate part and the fixed electrode can be set reliably,
A high level of uniform welding quality is achieved. In the prior art, the fixed electrode and the steel plate
Since the relative position is not known,
Is very burdensome for the operator, and moreover,
Although the problem of inconvenience occurs, in the present invention,
As described above, `` stroke while holding the part on the movable electrode
The center of the fixed electrode is irradiated and marked.
A steel plate part on a fixed electrode "
Thus, all of the above problems are eliminated. In addition, the book
The present invention is based on the assumption that
Locating pins as in the prior art
Troubles of accurately pursuing the relative position between the device and the light emitting device
You will be free from it.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an overall state.

FIG. 2 is a plan view of a steel plate part.

FIG. 3 is a sectional view taken along line (3)-(3) of FIG. 2;

FIG. 4 is a three-dimensional view in which an irradiation mark is irradiated on an end face of a fixed electrode.

FIG. 5 is a three-dimensional view showing a state where a welding position display mark and an irradiation mark of a steel plate part are matched on a fixed electrode.

FIG. 6 is a front view of another projection bolt.

FIG. 7 is a side view when the projection nut is held by the movable electrode.

[Explanation of symbols]

 Reference Signs List 1 fixed electrode 13 steel plate part 2 movable electrode 4, 21 part 14 irradiation means 17 welding position display mark

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 11/14 B23K 9/20 B23K 11/00 B23K 37/04

Claims (1)

(57) [Claims] 1. A welding method for welding a part held by a movable electrode to a steel plate part on a fixed electrode, wherein an irradiating means for irradiating a central part of the fixed electrode is installed, and a welding position display mark previously attached to the steel part. A positioning method in projection welding or the like, wherein the relative position between the fixed electrode and the steel plate part is set by irradiating the steel sheet with the irradiation means.