JP2874991B2 - Method for electric resistance welding of a metal tube to a curved part made of a thin metal plate - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric resistance welding method, and more particularly to a method for electric resistance welding of a metal tube to a curved portion of an article made of a thin metal plate. .

2. Description of the Related Art In the field of various technologies, in various thin metal sheet articles, the article has a curved surface portion such as a cylindrical surface or a curved surface, and a metal tube is penetrated through the curved surface portion. It is necessary to weld this metal tube to this curved part,
Often occurs.

Conventionally, in such a case, for example, the seventh
Curved surface portion of the thin metal plate made of an article 10 as shown in FIG., For example, a cylindrical surface 10 _0, when attaching the metal tube 11, curved portion, i.e., the portion of the cylindrical surface 10 _0, in advance,
Place the flat portion 10 ₁ is formed by an appropriate means, after a hole 12 having an inner diameter corresponding to the outer diameter of the metal tube 11 to the planar portion 10 _1, insert the metal pipe 10 through the hole 12 , the outer surface of the metal tube 11, between the periphery of the flat portion 10 ₁ of ₀ curved surface portion 10 which is a hole 12, is possible to perform appropriate welding, are common practice. Also, in this case, generally,
The welded part of the metal tube 11 must be
11 _0, by appropriate means, placed and formed so as to protrude from the outer peripheral surface, a flat portion 10 ₁ of the curved surface portion 10 _0, between the projecting portion 11 ₀ of the annular surface of the annular, the welding The implementation makes the welding easy and robust.

Problems to be Solved by the Invention However, when a metal pipe is attached to a curved surface portion of such a thin metal plate article by welding, it is necessary to form and place a flat portion on the curved surface portion in advance, The task is tedious.

Therefore, the present invention, when welding a metal pipe to the curved surface portion of such a thin metal plate article, without having to form a flat portion in advance in this curved surface portion,
It is an object of the present invention to obtain a novel welding method capable of firmly performing electric resistance welding on a curved portion of a metal tube.

In the means present invention for solving the Problems In order to solve this problem, as shown in Figure 1 of the accompanying drawings, the curved portion 1 ₀ of the article 1 made of a thin metal plate, for example, a metal cylindrical surface when electric resistance welding pipe 2, a hole 3 having an inner diameter corresponding to the outer diameter of the metal pipe 2 to be an electrical resistance welding to the curved portion 1 _0, also the metal tube 2 is its welded to the outer peripheral surface near the open end, previously placed to form a protruding portion 2 ₁ of the annular shape so as to protrude to the outside, the metal tube 2, projecting portions 2 ₁ open tube end which is formed with the annular from the portion of the part 2 ₀ in a curved part 1 _0, through the holes 3 bored with it, after inserting to the annular surface of the projecting portion 2 ₀ of the annular metal pipe 2 is in contact with the curved surface 1 _0, metal a curved portion 1 ₀ of the plugged tube 2 side, overhanging an annular formed in the metal pipe 2 And 2 ₀ annular surface that is remote from the opening tube end 2 _0, by each electrode (A) 5 and electrode (B) 6 of the electric resistance welding machine, the curved portion is deformed projecting portion of the annular metal tube This problem is solved by an electric resistance welding method characterized in that electric resistance welding is performed under a strong pressure so as to be familiar.

In this case, the opposing surfaces of the electrodes (A) 5 and (B) 6, it is desirable to place to form a curved surface corresponding to the curved portion 1 ₀ of the article 1.

In this way, the overhang of the metal tube and the curved surface of the article are strongly pressed by the respective electrodes so that the curved surface deforms and fits into the annular overhang of the metal tube, and is electrically resistance-welded. is it the annular surface of the projecting portion 2 ₀ of the annular preformed, curved portion 1 ₀ of the article 1
The electric resistance welding can be performed firmly. In this case, as in the prior art, the curved surface portion 1 ₀ of the article 1 advance, there is no need to place to form a flat portion, the welding operation can be very easily implemented.

Embodiments The present invention will be described below in detail with reference to FIGS.

First, in the first and 2 diagram, reference numeral 1 is illustrates a thin metal plate made of an article, the article 1, for example, it is assumed to have a cylindrical curved surface portion 1 _0, this a curved portion 1 _0, through a part of the metal pipe 2, the central axis Z-Z is, insertion so as to be perpendicular to the center line X-X of the curved portion 1 _0, opening tube end 2 ₀ Part of the curved part
Projecting within one _0, the metal tube 2 into a curved portion 1 ₀ shall be welded at its outer surface.

For this purpose, the curved portion 1 ₀ of the article 1, the attachment point of the metal pipe 2, in advance, put a hole 3 having an inner diameter corresponding to the outer diameter of the metal tube 2.

Moreover, the metal tube 2, as shown in FIG. 3, as in the case of conventional welding, to the outer surface near its opening tube end 2 _0, has an outer diameter suitable radial annular, substantially flat overhanging portion 2 _1, by appropriate means, shall be appointed to form to protrude outwardly. In this case, the annular protruding portion 2 _1, its cross section, is substantially flat if arcuate and is so formed enough, the inner surface portion of the metal tube 2 facing forming the overhang 2 _1, Adhering to each other is not always necessary.

Thus, in advance, the article 1, Place a hole 3 in the curved portion 1 ₀ of the cylindrical, also the metal tube 2,
Near the outer surface of the opening tube end 2 ₀ to be the welding, by forming a protruding portion 2 ₁ of the annular article 1 and the metal tube 2 are ready for welding.

Separately, an electrode of the electric resistance welding machine is prepared.
That is, the first, second and third figure to indicate the principle of electrodes used in the present invention, in advance, so as to have an inner diameter corresponding to the outer diameter of the metal pipe 2, a certain depth depressions 5 ₁
Spaced, the peripheral surface of the recess 5 ₁ of the opening 5 _2, the curved surface 5 ₃ corresponding to the inner peripheral surface of the cylindrical curved surface portion 1 ₀ of the article 1, the metal tube 2
Than the outer diameter of the annular protruding portion 2 ₁ of the annular surface of, has an electrode (A) 5, which is dimensioned such as larger, similarly, the inner diameter corresponding to the outer diameter of the metal pipe 2 the peripheral surface of the electrode (a) of the opposed to 5 are through holes 6 ₁ opening 6 ₂ together are forming a through-hole _61, the outer of the projecting portion 2 ₁ of the annular surface of the annular metal pipe 2 than the diameter, so as to have dimensions such that larger, to prepare the curved surface 6 ₃ are formed with which the electrode (B) 6 corresponding to the outer peripheral surface of the cylindrical curved surface 1 ₀ of the article 1.

The electric resistance welding machine, one of its example, the vertical electrode holder 7, than the inner diameter of the cylindrical curved surface portion 1 ₀ of the article 1, more than the smaller outer diameter and its length, greater than the somewhat length have. For example, place the horizontal arm ₇₁ is formed to project integrally on the lower surface near its distal end, placing the electrode (A) 5 and fixed vertically. In addition, another electrode (B) 6 is attached to the other electrode holder (not shown).
The electrode (A) 5 is arranged so as to be vertically fixed so as to be vertically aligned.

Thus, after preparing each electrode holder of the electric resistance welding machine (one vertical electrode holder is indicated by reference numeral 7) and each electrode (A) 5 and electrode (B) 6, the article 1 horizontal arms of the cylindrical curved surface 1 ₀ electrode holder 7
7 is inserted into _1, the recess 5 ₁ formed by an electrode (A) 5 fixed to the lower surface of the vertical center line Z-Z is a hole 3 bored in the cylindrical curved surface portion 1 ₀ of the metal pipe 2 It is made to face the vertical center line Z-Z. In addition, the other electrode (B) 6, the metal tube 2 into the through hole 6 in _one, the annular protruding portion 2 ₁ of the annular surface of which is formed on it, the electrode (B) 6 through holes 6 ₁ in Aperture
6 to be in contact with the curved surface 6 ₃ formed around the _2, put inserted. Then, as shown in 1 and 2 FIG., The metal tube 2 are accommodated in the electrode (B) 6 of the through hole 6 in _one, hole 3 bored in the cylindrical curved surface portion 1 ₀ of the article 1 to , from the outside of the cylindrical curved surface 1 _0, insert a top opening tube end 2 ₀ of the metal tube 2, projecting portions 2 ₀ annular formed in the metal pipe 2
Annular surface of causes to be in contact with the outer surface of the cylindrical curved surface 1 ₀ of the article 1.

In this state, inside the metal pipe 2, the other electrode (A) 5, via a horizontal arm ₇₁ of the electrode holder 7,
Electrode (B) 6 is lowered toward the curved formed around the electrode (A) recess 5 formed in 5 ₁ of the opening 5 ₂ 5
_3, causes the contact with the inner peripheral surface of the cylindrical curved surface 1 ₀ of the article 1. In this case, the opening tube end 2 ₀ of the metal pipe 2
Is in a state approaching 5 ₁ of the bottom surface recess formed in the electrode (A) 5.

In this state, by the operation of both the electrode holder, one electrode (A) 5, the recess 5 ₁ curved 5 ₃ formed around the opening 5 _2, the cylindrical curved surface portion 1 ₀ of the article 1
And the other electrode (B) 6 is
The through hole ₆₁ of the opening 6 _second curved 6 ₃ formed around the can,
The other annular surface of the projecting portion 2 ₁ one at the same time the annular when in intimate contact the annular surface of the annular protruding portion 2 ₁ formed in the metal tube 2, the outer peripheral surface of the cylindrical curved surface portion 1 ₀ of the article 1 Have close contact.

After arranging each electrode (A) 5 and electrode (B) 6 on the article 1 in such a state, the electrodes (A) 5 and (B) 6 are energized through the electrode holder of the electric resistance welding machine. each electrode (a) and (B) by 6, the cylindrical curved surface portion of the extending portion 2 ₁ and the article 1 of annular formed in the metal pipe 2 as well as
1 _0, pressed by powerful force.

Thus, the annular surface of the projecting portion 2 ₀ of the circular cylindrical curved surface 1 ₀ and the metal tube 2 of the article 1 is strongly pressed in between the electrodes both electrodes of the resistance welding machine (A) 5 and (B) 6 It will be. This great power, as shown in FIG. 4, the cylindrical curved surface 1 ₀ of the article 1, it faces the metal pipe 2 to the annular protruding portion 2 ₀ to adapt deformed by the metal pipe 2 at the same time as the annular surface of the projecting portion 2 ₀ of the annular, and be firmly welded to the outer peripheral surface of the cylindrical curved surface 1 ₀ of the article 1.

Note that the above has been described the principles of the present invention method, in fact, the electrode (B) to 6 through holes 6 ₁ in order to facilitate insertion of the metal pipe 2, the electrode (B) 6, as shown in FIG. 5, 2 divided by the plane passing through the center line Z-Z of the through hole _61, and composed of a pair of split electrodes (a) 6-1 and 6-2, these It is desirable that the electrodes are configured to be able to approach and separate from each other so as to surround or separate from the metal tube 2. In the figure, the reference numerals 6 ₁ -1,6 ₁ -2; 6 ₂ -1,6 ₂ -2; 6 ₃ -1,6 ₃ -2 are the integrated type shown in the previous figure, respectively. electrodes (a) 6 through holes 6 ₁ formed in the openings 6 ₂ and curved 6 _3, each split electrode (B) 6-1 and 6-2, respectively, are formed in the half of them state It shows the situation where it is.

Next, based on FIG. 6, these paired split electrodes (B) 6-1 and 6-2 are used, and these electrodes (B) are used.
6-1 and 6-2, in cooperation with other electrode (A) 5 illustrating a process of welding the metal pipe 2 into the cylindrical curved surface portion 1 ₀ of the article 1.

Step I (the same figure) In a state where the split electrodes (B) 6-1 and 6-2 are separated from each other, a center line ZZ between them is provided.
Over, so that the center line Z-Z of the depression 5 ₁ formed on the other electrode (A) 5, a setup.

Step II (same figure) Right electrode (A) 6-2 in the same figure
And the divided surface, the electrode (A) 5 of the depression 5 ₁ of the center line Z
-Move horizontally so that it is within Z.

Step III (same figure) Metal tube 2 is connected to both electrodes (B) 6-1.
And passed through a gap between the 6-2, the metal tube 2 is placed on the electrode (B) 6-2 through holes 6 ₁ in 2. in this case,
Overhang 2 _first annular surface of the annular formed in the metal tube 2,
To be placed on the electrode (B) 6-2 curved surface 6 _3-2.

The step IV (FIG) another electrode (B) 6-1, is moved horizontally to the right as viewed in the figure, this electrode (B) 6-1, the inner peripheral surface of the through hole 6 ₁ -1 but the projecting portion 2 ₀ of the annular well as contact with the outer peripheral surface of the metal pipe 2, to be placed on the electrode (B) 6-1 curved surface 6 ₃ -1.

And step V (drawing) opening tube end 2 ₀ of the metal tube 2, through the gap between the electrodes (A) 5, the article 1 is inserted into the horizontal arm ₇₁ of the electrode holder 7.

Step VI (FIG) so the article 1 is lowered vertically, pierce a hole 3 bored in the cylindrical curved surface portion 1 _0, so that the opening tube end 2 ₀ of the metal pipe 2 is inserted.

Step VII (same figure) Electrode (A) 5 is replaced with electrode (B) 6-1
And towards the 6-2 is lowered, the protruding portion 2 ₀ of the annular formed in the cylindrical curved surface portion 1 ₀ and the metal tube 2 of the article 1,
It is held between both electrodes (A) 5 and electrodes (B) 6-1 and 6-2.

Step VIII (same figure) Both electrodes (A) 5 and electrode (B)
6-1 and 6-2 and, by energizing while applying strong pressure to be directed towards each other, to the cylindrical curved surface portion 1 ₀ of the article 1, the metal tube 2 an annular protruding portion 2 ₁ of Complete the electrical resistance welding on the part.

As described above, according to the method of the present invention, when welding a metal pipe to a curved surface portion such as a cylindrical surface of an article made of a thin metal plate, only a hole having an inner diameter corresponding to the outer diameter of the metal tube is formed in the curved surface portion. Therefore, the welding operation by the electric resistance of the metal tube to the curved surface portion can be greatly simplified as compared with the conventional case.

In the above description, an article made of a thin metal plate has a cylindrical surface as a curved surface portion, and a metal tube is welded to the outer surface thereof. It is clear that the metal pipe can be easily welded even when the metal pipe has

Similarly, it is also possible to weld a metal pipe inside a curved surface portion such as a curved surface or a cylindrical surface,
It is clear.

Effect of the Invention According to the present invention, electric resistance welding is performed by strongly pressing the protruding portion of the metal tube and the curved surface portion of the article by each electrode so that the curved surface portion deforms and fits into the annular protruding portion of the metal tube. Therefore, there is no need to perform a step of forming a flat portion on the curved surface portion. The process makes it possible to weld very easily and with high productivity.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view showing the arrangement of electrodes of an electrode resistance welding machine for carrying out the method of the present invention, together with an article having a cylindrical surface to be welded to each other and a metal tube; Similarly, a longitudinal front view, FIG. 3 is a cylindrical curved surface portion of the article,
FIG. 4 is an enlarged vertical sectional front view showing the metal tube and the electrode in the state of a welding agent, FIG. 4 is an enlarged vertical sectional front view showing the same after the welding, and FIG. 5 is a schematic view showing deformation of the electrode. FIG. 5 is a process diagram in the case of performing welding with the electrode shown in FIG. 5, and FIG. It is explanatory sectional drawing which shows an example. 1 ...... thin metal plate made article, 1 ₀ ...... cylindrical curved surface portion, 2 ......
Metal tube, overhang of 2 ₀ ...... annular, 5,6 ...... electrode (A)
And (B), 6-1 and 6-2 ... split electrode (B), 7 ... electrode holder.

Claims (3)

(57) [Claims] 1. A curved portion of an article made of a thin metal plate is provided with a hole having an inner diameter corresponding to the outer diameter of a metal pipe to be welded, and a radial direction is formed on an outer surface near an open pipe end of the metal pipe. The metal tube is inserted into the hole until the annular surface of the protrusion contacts the curved surface portion of the article, and the metal tube is resistance-welded to the article made of a thin metal plate. In one embodiment, one electrode is
The opening of the annular overhang of the metal tube is arranged so as to contact the annular surface remote from the end of the tube, and the other electrode is arranged so as to contact the inside of the curved surface portion of the article. An electric resistance welding method, wherein the electric resistance welding is performed by strongly pressing each of the electrodes and the curved surface portion of the article so that the curved surface portion deforms and fits into the annular overhang of the metal tube. 2. The electric resistance welding method according to claim 1, wherein the surfaces of the electrodes facing each other are formed into a curved surface corresponding to the curvature of the curved surface portion of the article. 3. The electric resistance welding method according to claim 1, wherein at least one of the electrodes comprises a split electrode.