JP2516096Y2 - Seam welder - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention relates to a seam welding machine using an electrode wheel with a current-carrying pressure method.

B. Outline of the Invention This invention is a seam welding machine using an electrode pressurization method that uses an electrode wheel, which is a type of resistance welding, and in the contact surface of the electrode wheel with the material to be welded, there are columnar protrusions and streaky protrusions. By forming it so that it continuously contacts with the material to be welded as the electrode wheel rolls, it is possible to effectively perform seam welding even for materials with low electrical resistivity (μΩ · cm). It was done like this.

C. Conventional Technology FIGS. 5A and 5B are a front view and a cross-sectional view taken along the line XX of the conventional seam welding machine, which is one type of resistance welding by the current-pressurizing method using an electrode wheel. .

In FIGS. 5A and 5B, reference numeral 1 is an insulator, and a rectangular concave portion is formed in a part of the insulator 1, and a rectangular electrode body 2 is fitted in the concave portion. On the upper surface of the electrode body 2, a part of the materials to be welded 3 and 4 are arranged so as to overlap each other.

Reference numeral 5 denotes an electrode wheel which is rotatably formed, and the electrode wheel 5 is configured to roll on the upper surface of the material to be welded 4 at the overlapping portion of the materials to be welded 3 and 4. A welding power source 6 is connected to the power source 2 and the electrode wheel 5. 7 is a welding site.

In the conventional seam welding machine configured as described above, in order to weld the materials to be welded 3 and 4 at the welding site 7, a predetermined welding current is applied from the power source 6 between the electrode body 2 and the electrode wheel 5. To do. At this time, the electrode wheel 5 rolls on the upper surface of the material 4 to be welded and welds the material 3 and 4 to be welded. This welding principle is the contact resistance between the electrode body 2 and the material 3 to be welded, the contact resistance between the material 4 to be welded and the electrode wheel 5, the resistance of the materials 3 and 4 to be welded, and the contact resistance to the materials 3 and 4 to be welded. Therefore, when a welding current I is passed between the electrode body 2 and the electrode wheel 5, heat is generated by I ² R (R is the sum of the above resistances).
In addition, in order to generate heat, the pressure and energization time are taken into consideration in addition to the above current and resistance.

D. Problems to be Solved by the Invention When a welding current is applied between the electrode body 2 and the electric wheel 5 as described above, the resistance of the work pieces 3 and 4 themselves and the contact between the work pieces 3 and 4 When the resistance is high, the amount of heat generation increases in proportion to the resistance according to the formula of I ² R, so that the welding can be satisfactorily performed.

However, the electrical resistivity of the materials to be welded 3 and 4 (μΩ, cm)
If the material is small, such as Cu, the material to be welded 3,
There is a problem that it becomes difficult to obtain a sufficient amount of heat generation between 4 and welding becomes difficult.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a seam welding machine capable of reliably welding even a material having a low electric resistivity.

E. Means for Solving the Problems This invention is a seam welding method in which superposed materials to be welded are sandwiched between a pair of electrodes, at least one of which is a rolling electrode wheel, and continuously electrically welded under pressure and energized. In the machine
Columnar projections are scattered on the contact surface of at least one of the electrode wheels with the material to be welded, and the tip surface of any one of the projections continuously contacts the material to be welded as the electrode wheel rolls. The columnar protrusions are arranged in such a manner as described above.

F. Action Since the electrode wheel is provided with the protrusions as described above,
Since the contact area between the protrusion and the material to be welded is only the protrusion surface, current diffusion does not occur, and the current concentrates only on the surface in contact with the protrusion. In addition, since the projection presses the material to be welded, the pressing force per unit area increases and the contact resistance between the projection surface and the material to be welded also decreases. Due to these phenomena, the contact resistance between the electrode wheel (and the electrode body) and the material to be welded is reduced, and the heat loss at this site is reduced. Therefore, the proportion of the amount of heat generated by the contact resistance in the material to be welded and between the materials to be welded increases accordingly, and the current necessary for welding is concentrated and effectively flowed to the material to be welded.
Even materials to be welded having a low electric resistivity can be welded.

G. Example Hereinafter, an example of the present invention will be described with reference to the drawings.
The same parts as those in FIGS. 5A and 5B are designated by the same reference numerals.

In FIGS. 1A, B and C, columnar protrusions 12 and 13 arranged in a staggered manner are provided on the outer peripheral surface 11 of the electrode wheel 5. This columnar projection 12,13
As shown in FIG. 1C, the columnar protrusions 12 and 13 are arranged between the protrusions so that they are not juxtaposed. That is, the projections 12 and 13 are arranged so that the energization is not interrupted when the electrode wheel 5 comes into contact with the workpiece 4 and rolls. Also,
As shown in FIG. 1B, the electrode body 2 is provided with holes 14 and 15 arranged in a staggered pattern.

Since the electrode body 2 and the electrode wheel 5 are configured as described above, when the electrode wheel 5 rolls on the upper surface of the material 4 to be welded, the columnar protrusion 1
2, 13 are brought into contact with the material 4 to be welded alternately and without electrical interruption. The columnar projections 12 and 13 alternately contact the material to be welded 4, and the current flows only from the tip portions of the projections 12 and 13, so that the current does not spread over a wide range. At the same time, since the columnar protrusions 12 and 13 are used, the pressing force per unit area of the electrode is increased, and moreover, the electrode wheel 5 and the work piece 4 are welded.
Since the absolute amount of contact resistance with the electric field decreases, a large welding current flows intensively in a narrow range in a member with a low electrical resistivity, and even a welded member with a low electrical resistivity effectively generates heat between the materials to be welded. Welding can be performed reliably and satisfactorily.

2A, 2B and 2C show another embodiment of the present invention, which is shown in FIG.
In A, B and C, 16 is a streak-like projection formed on the outer peripheral surface 11 of the electrode wheel 5, and this projection 16 is formed obliquely as shown in the development view of FIG. 2C. It should be noted that the electrode body 2 is provided with several streak-like protrusions 17 parallel to the longitudinal direction as shown in FIG. 2B. As shown in FIGS. 2A, 2B and 2C, the electrode body 2 and the electrode wheel 5
By using, it is possible to reliably weld the materials 3 and 4 to be welded having a low electric resistivity.

3A and 3B and 4A and 4B are a developed view and a plan view of the streak-like projections 16 and 17 formed on the electrode wheel 5 and the electrode body 2, respectively. FIG. One streak-like protrusion 16a is provided at the center of the outer peripheral surface, and FIG. 3B shows the electrode body 2
It is an oblique streak 17a formed on the. FIG. 4A is provided with a protrusion 16 similar to that of FIG. 2A, and FIG. 4B is a protrusion 18a whose direction is different from that of the protrusion of FIG. 2A.

In the above embodiment, the protrusion formed on the outer peripheral surface 11 of the electrode wheel 5
12,13,16,16a, 17a may be three or more rows, and the shape of the protrusion may be other than circular.

In addition, instead of the electrode body 2 in each of the above-described embodiments, an electrode wheel having columnar or streak-shaped protrusions on the outer peripheral surface is used, and welding target materials 3 and 4 are sandwiched between a pair of rotating electrode wheels for welding. May be performed.

H. Effect of the Invention As described above, according to the invention, even for a material having a low electric resistivity, the welding current is intensively applied to effectively generate heat between the materials to be welded, thereby effectively performing the seam welding. There is an advantage that can be.

[Brief description of drawings]

1A, 1B, 1C show an embodiment of the present invention.
A, B are enlarged perspective views of the main part, FIG. 1C is a development view of the outer peripheral surface of the electrode wheel, and FIGS. 2A, B, C show another embodiment of the present invention. , B are enlarged perspective views of the main part, FIG. 2C is a development view of the outer peripheral surface of the electrode wheel, FIGS. 3A and 3B and 4A, B are development views and plan views of the electrode wheel and the electrode body, 5A and 5B are a front view and a cross-sectional view taken along the line XX of the conventional seam welding machine. 2 ... Electrode body, 3,4 ... Welded material, 5 ... Electrode wheel, 12,13
…… Column-shaped projections, 16,17 …… Striated projections.

Claims (1)

(57) [Scope of utility model registration request] 1. A seam welding machine, wherein at least one of the electrodes to be welded is sandwiched between a pair of electrodes, at least one of which is a rolling electrode wheel, and electric welding is continuously performed while applying current under pressure. Column-shaped projections are scattered on the contact surface of the wheel with the material to be welded. A seam welding machine characterized in that the protrusions are arranged.