JPH0550251A - Method for joining planer material - Google Patents

Abstract

PURPOSE:To provide a method for joining a first and a second planer materials without increasing thickness by means of a resistance welding method. CONSTITUTION:In a space S between coil materials 1, 2 which are the first and the second materials to be worked with a press, a welding flux 3 as a third material is arranged; these materials 1, 2, 3 are heated by an electrical resistance by energizing between a pair of electrodes 4, 5; simultaneously, the coil materials 1, 2 and the welding flux 3 are pressurized by both electrodes 4, 5; while the coil materials 1, 2 and the welding flux 3 are made to have the thickness of the coil materials 1, 2 or less, the coil materials 1, 2 are joined via the welding flux 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting two plate-shaped materials by welding, and can be used, for example, for connecting coil materials fed to a press machine and processed. Is.

[0002]

BACKGROUND ART A coil material processed by a press machine is fed from an uncoiler, passed through required devices such as a loop controller and a leveler feeder, and then sent to the press machine.
After the full length of coil material has been fed from the uncoiler, if you want to continue working with the press machine, set a new coil material in the uncoiler and weld the tip of this coil material to the rear end of the previous coil material. Connection is done with.

When the coil materials are connected by welding as described above, if the end portions of both coil materials are overlapped and spot-welded, the plate thickness of the connection portion becomes large, so that, for example, drawing processing by a press machine cannot be performed. The problem arises. On the other hand, when the ends of both coil materials are abutted and spot welding is performed at this abutting point, the electrical resistance at this point is small because the plate thickness of the abutting point to be welded is small, so the amount of heat generated is small and the coil materials are However, there is a problem that the connection strength of is reduced.

Therefore, conventionally, the coil materials are connected to each other by TIG welding or plasma welding the abutted ends of these coil materials.

[0005]

However, since TIG welding is a kind of arc welding that generates a large amount of heat, the problem is that the welding work cannot be performed as prescribed when the coil material is a thin plate of 1 mm or less, for example. In addition, there is a problem that both ends of the coil material in the width direction of the butted portion melt down. Also, when the coil material is a steel sheet that has been rust-proofed with a zinc coating, zinc burns at a high temperature, which causes a problem that the coil material melts.
If oil or other deposits adhere to one coil material, an arc will occur only between the coil material on one side and the electrode, making it difficult to melt both coil materials and connect them in a prescribed manner. There is also. In addition, TIG welding has a problem that the entire welding apparatus becomes large and expensive. In addition to the above problems, plasma welding has a problem that the plasma portion cannot be made compact due to the welding principle, and it is difficult to weld coil materials in a narrow width range.

An object of the present invention is to connect plate-shaped materials such as coil materials without increasing the plate thickness by the resistance welding method, which has a simple principle and can achieve downsizing of the entire welding apparatus and cost reduction. Another object of the present invention is to provide a method for connecting plate-shaped materials, which enables the connection of thin plate materials and allows the connection work by welding to be performed in a predetermined manner.

[0007]

A method for connecting plate-like materials according to the present invention is a plate-like first, which is to be connected to each other by welding.
A third material having the same or almost the same melting temperature as the second material is prepared, and this third material, which is a welding material, is arranged at the connection point of the first material and the second material. Is heated by electric resistance due to energization of a pair of electrodes, the first to third materials are melted by this heating, and the first to third materials are pressed by the pair of electrodes, and the first to third materials are pressed by this pressing. Is crushed to below the thickness of the first and second materials, whereby the first material and the second material are connected via the third material.

In the above, the first material and the second material may be arranged so as to face each other with a gap therebetween, and the third material arranged in the gap may be pressed together with the first and second materials by a pair of electrodes, or Alternatively, the first material and the second material may be arranged in abutment with each other, and the third material disposed on the upper surface of the abutting portion may be pressed together with the first and second materials by the pair of electrodes.

Further, the third material arranged on the upper surface of the abutting portion of the first material and the second material may be a round bar-shaped or plate-shaped short-sized material or a long-sized material. In the case of a long material, the third material is stretched when pressed by the pair of electrodes, and thereby cut into the required length.

[0010]

When the pair of electrodes are energized, the first to third materials are heated by electric resistance and melted, these materials are in a mixed state, and the first material and the second material pass through the third material. Since the pair of electrodes presses the first to third materials, the plate thickness of the connecting portion of the first material and the second material is equal to or larger than the original plate thickness of these materials. Therefore, it is possible to perform the connection work by welding while preventing the plate thickness from increasing.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 show the first embodiment. The plate-shaped first material and the second material to be connected to each other by welding are a first coil material 1 and a second coil material 2 which are processed by a press machine, and end portions 1A of these coil materials 1 and 2, 2A is arranged to face each other with a gap S at the place where the upper electrode 4 and the lower electrode 5 of the resistance welding device are arranged. A welding material 3 which is a third material is placed on the lower electrode 5 in the gap S, and the welding material 3 having a round bar shape has the same or substantially the same melting temperature as the first and second coil materials 1 and 2. Made of material.

The length L of the welding material 3 is equal to or shorter than the diameter D of the upper and lower surfaces of the upper and lower electrodes 4, 5, and the welding material 3
Has a diameter d larger than the thickness t of the first and second coil members 1 and 2. The lower electrode 5 is a fixed electrode, while the upper electrode 4 is a movable electrode that can move up and down.

Before the connection work is started, the upper electrode 4 is at the upper position, and the welding material 3 is placed in the gap S at this time.
When the upper electrode 4 descends and its lower surface comes into contact with the welding material 3 (see FIG. 2), the electrodes 4 and 5 are energized. By this energization, the contact portion between the first coil material 1 and the welding material 3 and the second
The contact portion between the coil material 2 and the welding material 3 generates heat due to contact resistance, and these portions and their surroundings are heated to a high temperature. As a result, the electric resistances of the first and second coil materials 1 and 2 and the welding material 3 are further increased, and the ends 1A and 2A of the first and second coil materials 1 and 2 and the welding material 3 are further heated and melted. It becomes a state.

The upper electrode 4 continues to descend even after the lower surface of the upper electrode 4 contacts the welding material 3, whereby the upper electrode 4 presses the welding material 3 together with the lower electrode 5. Therefore, the welding material 3 that is heated and melted is crushed. The lowering of the upper electrode 4 is performed until the distance between the upper electrode 4 and the lower electrode 5 becomes slightly smaller than t, whereby the ends 1A and 2A of the first and second coil members 1 and 2 together with the welding material 3 are applied to both electrodes 4. , 5 are pressed, and the end portion 1A and the welding material 3 and the end portion 2A and the welding material 3 which are in a high-temperature molten state are mixed with each other, and therefore, the first coil material 1 and the second coil material 2 The coil material 2 is connected through the welding material 3 arranged at these connection points. After the connection, the upper electrode 4 rises and returns to the old position.

In the above, the coil materials 1 and 2 and the welding material 3
When oil adheres to the surface of the coil or when the surfaces of the coil materials 1 and 2 are coated with zinc for rust prevention, oxides are generated from these due to the high temperature. Is instantaneously blown away by the pressing force from both electrodes 4 and 5, so that the coil materials 1 and 2 and the welding material 3 are connected by fusion-bonding the true materials 1, 2, and 3 together. Done, and thus a high connection strength is obtained.

As shown in FIG. 3, recesses 7 and 8 are formed on the upper and lower surfaces of the connecting portion 6 of the first and second coil members 1 and 2 by the pressing action of both electrodes 4 and 5. Therefore, the coil materials 1 and 2 and the welding material 3 are crushed to a size equal to or smaller than the thickness t of the coil materials 1 and 2, and the thickness of the connection portion 6 does not exceed t. For this reason, when the above welding work is repeated in the width direction of the coil materials 1 and the connecting coil material obtained by this is supplied to the press machine, a predetermined work operation such as drawing is performed with the die of the press machine. You will be able to do it.

In addition to the above, the method of connecting the plate-shaped materials of this embodiment is performed by resistance welding, and the principle of resistance welding is relatively simple as compared with TIG welding and plasma welding. It is possible to obtain the advantage that it can be constructed at low cost and can be manufactured at low cost. Further, since the materials to be connected to each other are not heated to such a high temperature that they melt down, the work of connecting thin coil materials can be performed, and the work of connecting a wide range of materials having different plate thicknesses can be performed.

If the pressing of the first and second coil members 1 and 2 and the welding member 3 by the electrodes 4 and 5 is released while these members 1, 2 and 3 are in a molten state, the molten material is It can also flow into the depressions 7, 8 so that, as shown in FIG. 5, the connecting portion 6 can be returned flat.

FIG. 6 shows a second embodiment. In this embodiment, the ends 1A and 2A of the first and second coil members 1 and 2 are butted against each other, and the welding material 10 as the third material is placed on the upper surface of the butted portion 9. The welding material 10 has a short flat plate shape.

After the upper electrode 4 is lowered and brought into contact with the welding material 10, when the electrodes 4 and 5 are energized, the coil material 1
The contact portion between 2 and the welding material 10 generates heat due to contact conflict,
The ends 1A and 2A of the coil materials 1 and 2 and the welding material 10 are heated and melted. Also in this embodiment, the upper electrode 4 is further lowered after contacting the welding material 10, and both electrodes 4 and 5 are the coil material 1 and
2. Press the welding material 10.

Therefore, the welding material 10 that is heated and melted
Is crushed by the pressing action of both electrodes 4, 5,
Similarly, the end portions 1A of the coil materials 1 and 2, which are heated and melted,
The welding material 10 is pushed into the 2A and enters. As a result, the coil materials 1 and 2 and the welding material 10 are mixed and fused, the first coil material 1 and the second coil material 2 are connected via the welding material 10, and the coil materials 1 and 2 and the welding material 10 are coiled. Material 1,2
Is crushed to a thickness t or less.

FIG. 7 shows a connecting portion 11 of the first coil material 1 and the second coil material 2 which are connected by the above work, and the upper and lower surfaces of the connecting portion 11 are dented by the pressing action of both electrodes 4, 5. Portions 12 and 13 are formed. It is also possible to return these depressions 12 and 13 to be flat as in the case described with reference to FIG.

In the above, the first and second coil materials 1 and 2
The end portions 1A and 2A of the end portions 1A and 2A may be abutted with each other without a gap, but these end portions 1A and 2A are
Even if there is a slight gap between A and 2A, the welding material 10
Thus, the work of connecting the first and second coil members 1 and 2 can be performed in a predetermined manner.

FIG. 8 shows a third embodiment, and FIGS.
Reference numeral 1 indicates a fourth embodiment. These embodiments are similar to the embodiment of FIG. 6 in that the end portions 1A and 2A of the first and second coil members 1 and 2 are
However, the kind of the welding material which is the third material arranged on the upper surface of the butted portion 9 is different from that of the embodiment of FIG.

The welding material 14 in the embodiment shown in FIG. 8 has a round bar shape and a short length. The welding material placed on the upper surface of the abutting portion 9 in this manner may be in the shape of a round bar as in FIG.

Welding material 15 in the embodiment of FIGS. 9 to 11
Is a round bar and is long. In this embodiment, FIG.
As shown in FIG. 11, when the upper electrode 4 comes into contact with the welding material 15 and further descends, and the welding material 15 is crushed to a predetermined amount by both electrodes 4 and 5 as shown in FIG. And the welding material 15 is cut with a tensile force F, leaving the tip portion 15A that is heated and melted under the upper electrode 4.
The remaining tip portion 15A intrudes into the end portions 1A and 2A of the coil members 1 and 2 while being crushed by the lowering of the upper electrode 4, and the first and second portions are the same as those in FIGS. 6 and 8. The coil materials 1 and 2 are connected.

According to this embodiment, since a long welding material 15 can be used, the welding material 15 is fed out by a constant amount from the automatic feeding means of the welding device, so that the coil materials 1 and 2 can be extended in the width direction. When performing welding work at a plurality of locations with the welding material 15, this work can be performed as an automatic work.

The first material and the second material in each of the above-described embodiments are the first coil material fed to the press machine and processed,
Although it was the second coil material, the method for connecting plate-shaped materials according to the present invention can be applied to coil materials processed by devices other than press machines, and can also be applied to plate-shaped materials other than coil materials. ..

[0029]

According to the present invention, the first and second materials and the third material
Since the first material and the second material are connected while pressing the materials with a pair of electrodes that heat these materials with electric resistance, the plate thickness of the material after connection is larger than the plate thickness of the material before connection. Therefore, the first and second materials can be connected without increasing the plate thickness, so that the materials can be processed as desired by a press machine or the like. Further, since the plate-shaped material connecting method of the present invention is based on the resistance welding method, the welding apparatus as a whole can be configured in a small size, the manufacturing cost can be reduced, and the thin plate material can be connected. Be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing a method of connecting plate-shaped materials according to a first embodiment.

FIG. 2 is a front view of FIG.

FIG. 3 is a perspective view showing a connecting portion of connected materials.

FIG. 4 is a front view of FIG.

5 is a view similar to FIG. 4, showing that the depression shown in FIG. 3 may return to a flat state in some cases.

FIG. 6 is a view similar to FIG. 1 showing a method for connecting plate-shaped materials according to a second embodiment.

FIG. 7 is a view similar to FIG. 3, showing connection parts connected by the method of FIG. 6;

FIG. 8 is a view similar to FIG. 1 showing a method of connecting plate-shaped materials according to a third embodiment.

FIG. 9 is a view similar to FIG. 1 showing a method of connecting plate-shaped materials according to a fourth embodiment.

FIG. 10 is a front view of FIG.

FIG. 11 is a front view showing the middle of the work that has proceeded from FIG.

[Explanation of symbols]

 1 1st coil material which is 1st material 2 2nd coil material which is 2nd material 3,10,14,15 Welding material which is 3rd material 4 Upper electrode 5 Lower electrode 9 Butt portion S Gap

Claims (5)

[Claims] 1. A plate-shaped first member to be connected to each other by welding.
A third material having the same or almost the same melting temperature as those of the first and second materials is arranged at the connection point of the material and the second material, and these first to third materials are electrically resistance by the energization of a pair of electrodes. The first to third materials are pressed by these electrodes while being heated and melted by the above, and by this pressing, the first to third materials are crushed to a thickness equal to or less than the thickness of the first and second materials to form the first material. Second
A method for connecting plate-shaped materials, which comprises connecting the materials. 2. The method for connecting plate-like materials according to claim 1, wherein the first material and the second material are arranged facing each other with a gap, and the third material arranged in the gap is the pair of electrodes. The method for connecting plate-shaped materials is characterized in that they are pressed together with the first and second materials. 3. The method for connecting plate-like materials according to claim 1, wherein the first material and the second material are arranged in abutment with each other, and the third material disposed on the upper surface of the abutting portion is the pair of electrodes. The method for connecting plate-shaped materials is characterized in that they are pressed together with the first and second materials. 4. The method for connecting plate-like materials according to claim 3, wherein the third material is a short material. 5. The method for connecting plate-like materials according to claim 3, wherein the third material is a long material, and the third material is applied with a tensile force when pressed by the pair of electrodes. A method for connecting plate-shaped materials, which is characterized by being cut.