JPH09201679A - Method, device and structure for joining different kinds of metallic materials, locking piece supporting body and electrode structure used to joining method and production of locking piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly execute a joining work in any positions of both electrodes by supplying a locking piece to interval between one pair of electrodes with feeding members. SOLUTION: The locking piece 3 is supplied to the interval between one pair of electrodes 4, 5 by connecting the conical shaped locking piece 3 composed of the same kind of metallic material as a second metallic material 2 and shifting the feeding members 8 shifted to the direction crossing almost at the right angle to the electrode 4. Successively, a first and second metallic materials 1, 2 to be joined are positioned between the electrodes 4, 5. Then, pressure-energizing is executed to the locking piece 3 and the first and second metallic materials 1, 2 in the condition of piling the metallic materials so that the tip part 3a of this locking piece 3 abuts on the first metallic material 1. Further, the feeding members 8 are arranged in one pair so as to interpose the electrodes 4, 5 with the feeding members, and since the locking piece 3 is connected with each member between one pair of feeding member, the locking piece 3 can be supplied between the electrodes in the desired stable position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining dissimilar metal materials, an apparatus for joining dissimilar metal materials, a joint structure for dissimilar metal materials, a retaining piece for holding dissimilar metal materials, and a dissimilar material for joining dissimilar metals. The present invention relates to an electrode structure used in a method for joining metal materials and a method for manufacturing a locking piece.

[0002]

The present inventor has developed a method for joining conductive dissimilar metal materials (for example, iron plates and aluminum plates). If this joining method is explained based on FIGS. 1 to 3, first,
As a conductive dissimilar metal material to be joined, a first metal material 1 such as an aluminum plate (preferably having a melting point lower than that of the second metal material) and a second metal material 2 such as an iron plate are prepared. A cone-shaped (for example, conical) locking piece 3 made of the same metal material as the second metal material 2 is prepared. Next, as shown in FIG. 1, the first metal material 1 and the second metal material 2 to be joined are placed between the pair of electrodes 4 and 5 in a superposed state. The electrode 5 is brought into contact with the first metal material 1, and the electrode 4 is brought into contact with the first metal material 1 via the locking piece 3. Then, after that, a current is passed between the electrodes 4 and 5, and the pair of electrodes 4 and 5 pressurize the first and second metal materials 1 and 2 and the locking piece 3.

As a result, the tip portion 3a of the locking piece 3 generates resistance heat, and the heat causes the tip portion 3a of the locking piece 3 to heat.
The first metal material 1 that is in contact with
Enters into the first metal material 1 based on the pressing force received from the electrodes 4 and 5, and the tip portion 3a of the locking piece 3 reaches the second metal material 2. When the tip portion 3a of the locking piece 3 reaches the second metal material 2, as shown in FIG.
The tip portion 3a of the strip 3 and the second metal material 2 are melted by resistance heating, and the contact portions of the two and 3 are resistance-welded. As this welding progresses, the tip 3a of the locking piece 3 melts into the second metal material 2 and becomes shorter, and the electrode 4 becomes shorter than the first metal material 1.
And the joining is completed (see FIG. 3). As a result,
The base end portion (expanded diameter portion) 3b of the locking piece 3 and the locking piece
The first metal material 1 is sandwiched between the first metal material 1 and the second metal material welded to the tip portion 3a of the space, and the first and second metal materials 1 and 2 utilize the locking pieces 3 Will be joined together.

[0004]

By the way, in the above joining method, since the locking piece 3 is used, it is necessary to supply the locking piece 3 every time the bonding is performed. Therefore, in the above joining method, in order to prevent the locking piece 3 from falling off, the front end surface of the one electrode 4 is directed right above, and the base end surface of the locking piece 3 is placed on the front end surface. After that, the electrode 4 is raised in this state so that the tip of the locking piece 3 is brought into contact with the first metal material 1. However, when such a supply method of the locking piece 3 is adopted, it is necessary that the tip end surface of one electrode 4 is always directed right above, so that both electrodes 4 and 5 are arranged only in the vertical direction. The first and second parts to be joined are configured to be held so as to be displaced and moved.
The metal materials 1 and 2 must be carried between the electrodes 4 and 5, and the postures of the first and second metal materials 1 and 2 must be suitable for the pressurization and energization work by the electrodes 4 and 5. For this reason, it is difficult to attach both electrodes to a robot arm or the like and perform the joining work in various postures.

Further, when the above joining method is used, the locking piece 3 enters the first metal material 1 while melting the first metal material 1, and thereafter, the locking piece 3 The base end portion (expanded diameter portion) of 3 and the second metal material are resistance-welded, and the base end portion of the locking piece 3 and the second metal material sandwich the first metal material 1. As a result, the first metal material and the second metal material are joined together. However, in the above joining method,
Since the locking piece 3 enters the first metal material 1 while melting the first metal material 1, when the above joining method is simply performed, the first metal material 1 and the second metal material 1 After joining with the material 2, dust (burrs) is generated around the base end portion of the locking piece 3. Therefore, not only the appearance may be deteriorated, but also electrolytic corrosion may occur at the joint portion of the first and second metal materials 1 and 2.

Further, in the above joining method, the locking piece 3 is used at each joining point so as to sandwich the first metal material 1 in cooperation with the second metal material 2. Therefore, it is desired that the locking piece 3 can be manufactured as quickly and easily (inexpensively) as possible. However, the locking piece 3 has a complicated cone shape and cannot be manufactured quickly and easily if it is manufactured by mechanical cutting or the like.

The present invention has been made in consideration of the above circumstances. A first object of the present invention is to provide a method for joining dissimilar metal materials, which allows a pair of electrodes to be joined quickly in any posture. To provide. A second object is to provide a method for joining dissimilar metal materials that improves appearance at the joint portion of the first and second metal materials and prevents occurrence of electrolytic corrosion. A third object is to provide a dissimilar metal material bonding apparatus used for carrying out the method for bonding dissimilar metal materials, which achieves the first object. A fourth object of the present invention is to provide a joining structure of different kinds of metallic materials used for carrying out the method for joining different kinds of metallic materials to achieve the second object. A fifth object is to provide a retaining piece holder used for carrying out the method for joining dissimilar metal materials. A sixth object is to provide a method for manufacturing a locking piece that can be provided quickly and easily. A seventh object is to provide an electrode structure used for carrying out the method for joining dissimilar metal materials, which achieves the first object.

[0008]

In order to achieve the first object, in the invention of claim 1, the first,
After the second metal material and the cone-shaped locking piece made of the same kind of metal material as the second metal material are positioned between the pair of electrodes, the pair of electrodes are used to lock the locking piece. And the first,
The first and second metal materials and the locking piece were superposed on the second metal material such that the tip of the locking piece was in contact with the first metal material. In this state, a method of joining dissimilar metal materials for applying pressure and energization is provided, wherein the pair of the pair of metal members is moved by moving the feed member that is moved in a direction substantially orthogonal to the electrode by connecting the locking pieces. The locking pieces are supplied between the electrodes sequentially.

Further, preferred embodiments of the invention of claim 1 are as described in claims 2 and 3.

In order to achieve the second object, claim 4
In the invention of claim 1, first and second metal materials to be joined,
The second metal material and a cone-shaped locking piece made of the same kind of metal material are overlapped with each other so that the tip end of the locking piece comes into contact with the first metal material, A method for joining dissimilar metal materials, wherein pressurization energization is applied to a stop piece and the first and second metal materials, wherein the locking piece and the first metal material are energized during the pressurization energization. The air is blown to the vicinity of the contact portion.

In order to achieve the second object, claim 5
In the invention of claim 1, first and second metal materials to be joined,
The second metal material and a cone-shaped locking piece made of the same kind of metal material are overlapped with each other so that the tip end of the locking piece comes into contact with the first metal material, A method of joining dissimilar metal materials for applying pressure and current to a stop piece and the first and second metal materials, wherein a flange portion is provided around the base end portion as the locking piece. A locking piece is prepared, and at the time of pressurizing and energizing, the flange portion is separated from the first metal material, and after the pressurizing and energizing,
Inclining the flange portion toward the first metal material so as to cooperate with the first metal material to form an annular closed space;
It is as a configuration.

In order to achieve the second object, claim 6
In the invention of claim 1, first and second metal materials to be joined,
The second metal material and a cone-shaped locking piece made of the same kind of metal material are overlapped with each other so that the tip end of the locking piece comes into contact with the first metal material, A method for joining dissimilar metal materials, in which pressurization energization is performed on the stop piece and the first and second metal materials, wherein the entire base end portion of the locking piece is It is configured to cover with a cap including the vicinity of the outside of the base end portion.

In order to achieve the third object, claim 7
In the invention described above, a pair of pressurizing energizing electrodes, which are arranged so as to be movable toward and away from each other and which can have a standby position and an operating position, and a plurality of cone-shaped locking pieces are connected to each other. , The electrodes are always disposed so as to cross the electrodes, and when the pair of pressurizing and energizing electrodes are in the standby position, one of the plurality of locking pieces is engaged between the pair of electrodes. A feed member for moving the stop piece so that the tip of the locking piece faces the tip surface of one of the pair of pressure-carrying electrodes. It is configured as a joining device for dissimilar metal materials.

As a preferred embodiment of the invention of claim 7,
It is as described in claim 8.

In order to achieve the fourth object, claim 9
In the invention, the tip of the cone-shaped locking piece made of the same kind of metal material as the second metal material is joined to the second metal material which is superposed on the first metal material. A joining structure of dissimilar metal materials in which the locking piece and the second metal material sandwich the first metal material, and the locking piece has a flange on the entire circumference of the base end portion. And a flange portion that is bent so as to cooperate with the first metal material to form an annular closed space.

[0016] To achieve the fourth object, claim 1
In the invention of No. 0, the tip of the cone-shaped locking piece made of the same kind of metal material as the second metal material is joined to the second metal material laminated with the first metal material. A joining structure of dissimilar metal materials in which the first metal material is sandwiched between the locking piece and the second metal material, and the locking piece is attached to the first metal material. The cap is fixed so as to cover the entire base end portion including the vicinity of the outside of the base end portion.

A preferred embodiment of the invention of claim 10 is as described in claim 11, claim 12, and claim 13.

In order to achieve the fifth object, claim 1
According to the invention of claim 3, a locking member comprising: a feed member extending in one direction; and a cone-shaped metal locking piece connected to the feeding portion at predetermined intervals. It is configured as a piece holder.

The preferred embodiments of the invention of claim 13 are as described in claims 14-17.

In order to achieve the sixth object, claim 1
According to the eighth aspect of the invention, a plate-shaped material is formed into a conical shape by press working, which is a method for manufacturing a locking piece.

[0021] A preferred embodiment of the invention of claim 18 is as described in claims 19 and 20.

In order to achieve the seventh object, claim 2
According to the first aspect of the invention, there is provided an electrode structure of an electrode for applying a current under pressure, which is provided with a slider slidably fitted to the electrode.

A preferred embodiment of the invention of claim 21 is as described in claim 22.

[0024]

According to the invention of claim 1, since the locking piece is supplied between the pair of electrodes by the feed member, not only can the locking piece be automated, but Regardless of the posture of the electrode, the locking piece can be stably supplied. Therefore, the joining work can be performed quickly regardless of the posture of the pair of electrodes.

According to the second aspect of the present invention, the current is prevented from leaking to the feeding member during pressurization, and the first and second metal materials and the locking piece are concentrated. It will be possible to perform piezoelectric energization.

According to the third aspect of the invention, the locking piece can be supplied between the pair of electrodes in a desired stable posture.

According to the fourth aspect of the present invention, dust is blown off by blowing air to prevent dust from being generated around the base end portion of the locking piece. Therefore, it is possible to improve the appearance of the joint portion of the first and second metal materials and prevent the occurrence of electrolytic corrosion.

According to the fifth aspect of the present invention, during pressurization and energization, current leakage to the flange portion can be prevented and current can be concentratedly flown to the tip portion of the locking piece. on the other hand,
After the first and second metal materials are joined together, even if dust is generated around the base end portion of the locking piece, the flange portion can cover the dust and prevent the dust from being exposed to the outside. Therefore, it is possible to improve the appearance of the joint portion of the first and second metal materials and prevent the occurrence of electrolytic corrosion. Moreover, due to the presence of the flange portion, the clamping force between the first metal material and the locking piece with respect to the second metal material is increased, and the bonding strength between the first and second metal materials can be increased. .

According to the invention of claim 6, even if dust is generated around the base end portion of the locking piece after joining the first and second metal materials, the dust is covered by the cap and the dust is removed from the outside. You can prevent it from being exposed to. For this reason, the first and second
It is possible to improve the appearance of the joint portion of the metal material and prevent the occurrence of electrolytic corrosion.

According to the invention of claim 7, the locking piece is automatically and stably supplied between the pair of electrodes by the feeding member, and is used for carrying out the invention of claim 1 described above. It is possible to provide a joining device that does.

According to the eighth aspect of the invention, since the movement restricting member restricts the movement of the feeding member, when the electrode moves the locking piece during the energization of the pressure, the movement of the engaging piece is based on the movement.
The locking piece can be reliably separated from the feed member, and the first and second metal materials and the locking piece can be centrally pressurized and energized.

According to the invention of claim 9, the flange portion can improve the appearance at the joint portion of the first and second metal materials, can prevent the occurrence of electrolytic corrosion, and can prevent the first and second metal materials from being generated. Since the joint strength of can be increased,
It is possible to provide a joining structure used for carrying out the invention of claim 5 described above.

According to the tenth aspect of the invention, the cap can improve the appearance at the joint portion of the first and second metal materials and can prevent the occurrence of electrolytic corrosion. Therefore, the invention of the sixth aspect is carried out. It will be possible to provide a joining structure used for.

According to the eleventh aspect of the invention, not only can the cap be firmly fixed to the first metal material by the adhesive agent filled in the cap, but it can also cover the dust, thereby preventing the occurrence of electrolytic corrosion. It can be prevented more reliably.

According to the twelfth aspect of the present invention, the fitting relationship between the hole in the base end face of the locking piece and the projection on the inner face of the cap can be utilized for positioning and fixing the cap.

According to the thirteenth aspect of the present invention, it is possible to provide a retaining piece holder which can be used for implementing the above-mentioned first aspect of the present invention.

According to the fourteenth aspect of the present invention, the locking piece can be supplied between the pair of electrodes in a desired stable posture, and the locking piece can be used for carrying out the invention of the third aspect. It will be possible to provide a holder for the support.

According to the fifteenth aspect of the present invention, it is possible to easily separate the feed member and the locking piece from each other by the weakening line, and the invention of the first and second aspects can be carried out. A suitable locking piece holder can be provided.

According to the sixteenth aspect of the present invention, it is possible to obtain the same operational effect as that of the fifteenth aspect based on the cut or the thin portion.

According to the seventeenth aspect of the invention, since the feed member and the locking piece are wound, the convenience of transportation, storage management and the like can be improved.

According to the eighteenth aspect of the present invention, since the locking piece is formed from the plate-shaped material by pressing, the locking piece can be manufactured quickly and easily.

According to the nineteenth aspect of the present invention, a plurality of locking pieces are continuously formed by press working on a long material. It can be manufactured more quickly.

According to the twentieth aspect of the invention, the area required for the manufacturing process can be reduced and the device can be compactly assembled.

According to the twenty-first aspect of the invention, the slider is
Electrode protection function when not in operation, locking piece, first,
It becomes possible to have various functions such as a function of protecting the electrode against the second metal material (buffer function), a function of directing the blowing direction of the dust blowing air to a desired direction, and the invention of claim 1 described above. It will be possible to provide an electrode structure suitable for implementation.

According to the twenty-second aspect of the present invention, the pair of locking legs and the locking claws of each locking leg guide the feed member and the like, so that the locking piece is properly positioned between the pair of electrodes. And then
Each of the locking claws restricts the movement of the feeding member based on the relative displacement with the electrode during pressurization and energization, and contributes to the separation of the locking piece and the feeding member. For this reason,
It is possible to provide an electrode structure most suitable for carrying out the inventions of claims 1, 2, and 3 described above.

[0046]

Embodiments of the present invention will be described below with reference to the drawings. The joining device 6 (see FIGS. 4 and 9) according to the present embodiment using the above-described joining method is attached to a robot arm (not shown), and the joining device 6 has a locking piece. 3 is automatically supplied, and by using the joining device 6, the first metallic material 1 and the second metallic material 2 can be quickly joined.

First, the locking piece 3 will be described. In the present embodiment, for supplying the locking piece 3, as shown in FIG. 5, a locking piece sheet 7 is used as a locking piece holding body in a wound state. The locking piece sheet 7 is formed by connecting a plurality of locking pieces 3 to a pair of feed bands 8 as feed members extending at regular intervals via a connecting portion 9. The locking pieces 3 are provided at predetermined intervals in the extending direction of the feed band portion 8. Moreover, a cut 10 as a weakening line portion is formed in each connecting portion 9 of the locking piece sheet 7 (see FIG. 8), and the locking piece 3 is attached to the feed band portion 8. In addition to making it easy to separate, the feed band portion 8 is formed with feed holes 11 at regular intervals in the extending direction so that feed can be performed by a feeder pin (not shown) in the feed mechanism. Such a locking piece 7 is set (held) on the robot arm in a wound state, and the locking piece is moved from the wound state.
The sheet 7 is pulled out by the feeding mechanism and used, and the locking piece sheet 7 after the use is again used by the robot arm.
It is supposed to be wound around a recovery reel or the like provided in the frame.

Therefore, by using the locking piece sheet 7 as described above, the locking piece 3 can be removed regardless of the posture of the robot arm (joining device 6). Therefore, the supply to the joining device 6 can be accurately and sequentially performed, and the supply of the locking piece 3 can be automated.

The locking piece sheet 7 is manufactured by pressing as follows. That is, a long plate-shaped material (for example, width L1 = about 30 mm) 12 is intermittently conveyed, and the plate-shaped material 12 is machined by the machining stations sequentially provided in FIG.
As shown in FIG. 7, it is to be done.

More specifically, in the first processing station S1, the feed holes 11 are provided on both sides in the width direction of the material 12 at a predetermined pitch (for example, L2 = 20 mm) corresponding to the intermittent conveyance of the material 12. Is formed. Both feed holes 11
The distance L3 is set to, for example, about 23 mm at this point.

Next, the holes 13 are formed in the third machining station S3 after the second machining station S2 as an idle (non-machining) station. This hole 1
The peripheral edges of 3 are curved on both sides in the extending direction of the material 12 so as to approach each other, so that the hole 13 at this time and the hole formed by the processing at the previous time in this third processing station S3. A substantially circular workpiece 14 is formed between the workpiece 13 and the workpiece 14.
A pair of feed strips 8 are formed so as to be sandwiched between the feed strips 8 and the processed portion 14 and the connecting portion 9 is formed.
Will be connected via.

In the next fourth processing station S4, the first drawing processing is performed. In this drawing, as shown in FIG. 7, the bulging portion 15 is formed in a substantially hemispherical shape, and the width L1 of the material 12 and the interval L3 between the feed holes 11 are shortened based on this drawing. (For example, the width L1-2 of the material 12 is about 24 mm, and the distance L3-2 between both feed holes 11 is 17 mm).

Next, after the fifth machining station S5 as the idle (non-machining) station, the second drawing process is performed in the sixth machining station S6. By this drawing process, the bulged portion 15 is formed into the substantially hemispherical shape described above.
However, the diameter of the base end face is reduced (for example, to about L4 = 12 mm) to form a conical body, whereby the locking piece 3 is formed. At this time, the connecting portion 9 extends slightly in the width direction of the material 12, and the rising angle θ of the conical side surface with respect to the surface of the material 12 is, for example, 45 degrees.

Next, after the seventh machining station S7 as an idle (non-machining) station, the list machining is performed in the eighth machining station S8. In this wrist processing, the material thickness L5 is pressed to about 0.2 mm in order to facilitate winding. At this time, the width L1 of the material 12 is about the initial width (for example, 30 m
The distance between the two feed holes 11 is the same as that of the fourth machining station S4 and thereafter (for example, L3-2 =).
17 mm).

Next, after the ninth machining station S9 as an idle (non-machining) station, in the tenth machining station S10, the connecting portion 9 is formed so that the locking piece 3 can be easily separated. A cut 10 is made in. The cut 10 is formed along the peripheral edge of the base end portion of the locking piece 3, and the depth L6 of the cut 10 is, for example, 0.
It is about 1 mm. After this, the locking piece 3
The locking piece sheet 7 provided with is wound around a reel or the like in sequence, and the manufacturing of the wound locking piece sheet 7 is completed.
Reference numeral 16 is a hole formed in the base end surface of the locking piece 3 due to press working, and the hole 16 is located at the radial center of the locking piece 3.

Therefore, in such a manufacturing method, the locking piece 3 is pressed from the plate-shaped material 12 by pressing.
As a result, the locking piece 3 can be manufactured quickly and easily (inexpensively). Moreover, the locking piece 3
Is manufactured as the locking piece sheet 7 in the above-mentioned wound state, the locking piece 3 can be manufactured more quickly under the flow work, and the convenience of transportation, storage, etc. is enhanced. It will be possible.

Next, the joining device 6 will be described.
The joining device 6, as shown in FIG. 9, has a pair of arms 17,
The pair of arms 17 and 18 are supported by a swing shaft 19 so that their intermediate portions can swing. The rear ends of these arms 17 and 18 (in FIG. 9,
An air cylinder 20 as a pressurizing means is installed between the right end portions), while the electrodes 4 (5) are fixed to the tips of the arms 17 (18), respectively. The pair of electrodes 4 and 5 can be moved toward and away from each other by the expansion and contraction movement of.

A power source 23 is connected to the electrodes 4 and 5 via a transformer 21 and a control device 22, and the control device 22 controls the magnitude of the current and the energization time for the electrodes 4 and 5. It is supposed to be. Control device 22
Is an energization control means, and a current is passed between the electrodes 4 and 5 via the first and second metal materials 1 and 2 and the locking piece 3 to melt the first metal material 1. The first
The locking piece 3 is made to enter into the metal material 1 up to the second metal material 2 (drilling step), and thereafter, the locking piece 3 and the second metal material 2 are resistance-welded (welding). Process).

Specifically, as shown by the solid line in FIG.
The current value between the electrodes 4 and 5 can be switched in two steps for each process by setting the drilling process and the welding process as predetermined times (for example, the current value in the drilling process can be changed to the current value in the welding process). As shown by the alternate long and short dash line in FIG. 18, control such as maintaining a constant current value is performed through the hole forming step and the welding step.

As shown in FIGS. 4 and 10, one of the pair of electrodes 4 and 5 (lower electrode in FIG. 10) is provided with a locking piece sheet 7 for guiding. A holding tool 24 as a slider for holding is provided. The holder 24 has a thick disc portion 25 and a pair of locking leg portions 26 standing upright from the tip of the disc portion 25.

The disk portion 25 has a through hole 27 at the center in the radial direction, and one electrode 4 is fitted in the through hole 27 so as to be displaceable. In this case, the through hole 2
It is preferable that the section 7 and the electrode 4 have a non-circular cross section so that they cannot rotate relative to each other. A plurality of air blowing holes 28 are opened around the through hole 27 at the tip end surface of the disc portion 25. A compressed air source (not shown) is connected to each air blowing hole 28, and compressed air 32 (shown by an arrow) is blown from each air blowing hole 28 by the supply of compressed air from the compressed air source. It is supposed to be.

The pair of locking leg portions 26 are arranged so as to face each other with the electrode 4 sandwiched therebetween, and the locking claws 29 of the disk portion 25 are provided at the tips of the respective locking leg portions 26. It is provided so as to project inward in the radial direction. The distance between the locking claws 29 in the pair of locking legs 26 is slightly larger than the diameter of the electrode 4 and the locking piece 3, and the distance between the locking claws 29 is set between the electrode 4 and the locking piece. 3 is supposed to be able to pass through.
Further, between the pair of locking leg portions 26, on the side of the disk portion 25 with respect to the locking claw 29, the above-described locking piece sheet 7 is provided.
(The pulled-out locking piece sheet 7) is the locking piece 3
The leading end portion 3a is passed through so as to face the other electrode 5 side. The locking piece sheet 7 includes a pair of locking legs 2.
The lateral shift is restricted by 6, and the locking claw 29 restricts the movement to the other electrode 5 side due to the relationship with the feed band portion 8. Therefore, the locking piece sheet 7 is intermittently conveyed only in the winding direction (the direction of the arrow in FIG. 4), and the locking piece 3 is attached to the tip surface of the electrode 4 at every feed pitch of the intermittent conveyance. It is supposed to be located above. In this case, the width of the locking leg portion 26 and the locking claw 29 (see FIG.
In particular, it is preferable to increase the guide function by widening the length (in the direction substantially vertical to the paper surface) as much as possible. The inner surface of the holder 24 is insulated from the electrode 4.

As shown in FIG. 10, a step portion 30 is formed on the one electrode 4 on the side closer to the base end than the holder 24, and the step portion 30 and the holder 24 form a spring 3.
1. This spring 31 is
When an external force does not act on the locking piece 4, a space larger than the thickness of the feed band portion 8 in the locking piece sheet 7 is formed between the locking claw 29 and the tip surface of the electrode 4, and the locking piece 7 It is supposed to secure a space where intermittent transport can be smoothly performed.

Next, a joining method using the above joining device 6 will be described. When the locking piece sheet 7 is fed by one pitch and the new locking piece 3 comes above the electrode 4, the robot arm causes the joining device 6 to move to the first metal material 1 and the first metal material 1. 2 The metal material 2 is moved to a position to be overlapped and to be joined, and the joining device 6 is used to hold the joining place.
(Latching leg portion 26) The tip end and the tip end of the other electrode 5 are clamped, and the clamping force is gradually increased.

As a result, the movement of the holder 24 is restricted based on the abutting relationship with the first metal material 1. As a result, one electrode 4 is opposed to the holder 24 against the urging force of the spring 31. It will be displaced. As a result, first, the locking leg 2
The locking claw 29 of 6 and the electrode 4 on one side are locked by the locking seat 7
The electrodes 4 and 5 are shown in FIG. 10 after the locking pieces 3 to be used are fixed to the electrode 4 and the holder 24 by securing the state by sandwiching them in a displaced state. So that the locking piece
The pressing tip 3a is started to be pressed against the joining point of the first and second metal materials 1 and 2 (first metal material 1 surface). In this case, the front end surface of the electrode 4 is brought into contact with the base end surface of the locking piece 3 without tilting, and the locking piece 3 is moved straight in the axial direction of the electrode 4 (locking point). The third metal material 1,
From the perspective of entering perpendicular to the two surfaces), the locking claw 29
It is preferable that the width (the length in the direction substantially vertical to the paper surface in FIG. 10) of the is wide.

In parallel with this, a current is also passed between the electrodes 4 and 5. As a result, the locking piece tip 3
a generates resistance heat, and the heat causes the first metal material 1 in contact with the tip portion 3a of the locking piece to melt, so that the locking piece 3 has electrodes 4, Based on the pressing force received from 5, the first metal material 1 gradually starts to enter. Along with this, while the locking piece 3 moves, the movement of the feeding band portion 8 is restricted by the locking claw 29, and the locking piece 3 is cut from the feeding band portion 8 by a cut 10. Will be separated in.

When the locking piece 3 moves further and the locking piece tip portion 3a reaches the second metal material 2, FIG.
As shown in FIG. 2, the locking piece tip 3 a and the second metal material 2
And are melted by resistance heat generation, and the contact portions of the two and 3a are resistance-welded. Then, when the welding further progresses, the tip portion 3a of the locking piece melts into the second metal material 2 and becomes shorter, and the electrode 4 comes into contact with the first metal material 1 to complete the joining (see FIG. 12). ). As a result, the first metal material 1 is formed between the base end portion (diameter expansion portion) 3b of the locking piece 3 and the second metal material 2 welded to the locking piece tip portion 3a. In the sandwiched state, the first and second metal materials 1 and 2 are joined by using the locking piece 3.

On the other hand, along with the above-mentioned joining work, compressed air 32 (shown by an arrow) is blown out from the air blowing hole 28. As a result, dust generated by the above-mentioned joining is blown off by the compressed air 32, and when the joining is completed (the state of FIG. 12), dust may stick to the vicinity of the peripheral portion of the locking piece base end portion 3b. It can be prevented.

When the joining of the first and second metal materials 1 and 2 is completed, the pair of electrodes 4 and 5 are moved away from each other, and the electrodes 4 and 5 are separated from the joining point. Thereby, the holder 24
Is relatively displaced with respect to one electrode 4 based on the urging force of the spring 31, and between the locking claw 29 and the tip surface of the one electrode 4,
A space is formed in which the locking piece sheet 7 can move smoothly. By catching this timing, the locking piece sheet 7 is newly fed by one pitch, the new locking piece 3 is positioned above the tip surface of one of the electrodes 4, and the joining device 6 is used for the next joining operation. After completing the preparations, it goes into a standby state.

Therefore, according to the joining method using the joining device 6 as described above, the robot arm can move to any joining point and the joining work can be performed quickly in any posture. Become.

In the above embodiment, air is blown to remove dust, but dust may be sucked and collected instead of blowing air. According to this, it is possible to prevent dust from being scattered in the work space,
It is possible to prevent the deterioration of the environment in the work space.

In the above embodiment, the locking pin is
As the base 3, a base end face 3b having a circular shape was used, but the base end face 3b of the locking piece 3 has a non-circular shape such as an ellipse, a star, a triangle, or a quadrangle (triangular pyramid, four Pyramid, etc.)
May be used. According to this, after the first and second metal materials 1 and 2 are joined together, the relative rotation of the first metal material 1 and the second metal material 2 about the locking piece 3 causes the locking. Based on the shape of the piece 3, even one locking piece 3 can effectively prevent it.

Further, the tip portion 3a of the locking piece 3 may be slightly rounded.

Furthermore, in the above embodiment, the flange portion 37 is extended along the side surface of the locking piece 3 (see FIG. 16), but the flange portion 37 is locked by the locking piece.
You may make it overhang so that it may expand from the base end part of the space 3 to the radial direction outer side (right side). According to this, the bending step of the flange portion 37 as in the above embodiment (see FIG.
7) is unnecessary.

13 and 14 show the second embodiment, FIG. 15 shows the third embodiment, and FIGS. 16 and 17 show the fourth embodiment. In each of the embodiments, the same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the second embodiment shown in FIGS. 13 and 14, when the first and second metal materials 1 and 2 are joined using the locking piece 3, the locking piece 3 is joined when the joining is completed. Base end 3b of
The present invention relates to measures to be taken when dust 33 is generated in the surroundings. That is, in this second embodiment,
The cap 34 entirely covers the base end surface 3c of the locking piece 3, and the dust 33 is also housed in the cap 34. Moreover, the cap 34 is filled with the adhesive 35, and the above-mentioned locking pin is provided at the center of the inner surface of the cap 34.
In order to use the hole 16 in the base end face 3c for positioning and fitting and holding, a protrusion 36 is provided, and the protrusion 36 is fitted in the hole 16. As a result, not only can the dust 33 be hidden to improve the appearance, but also electrolytic corrosion can be prevented.

In the third embodiment shown in FIG. 15, when joining the first and second metal materials 1 and 2 using a plurality of locking pieces 3, when the joining is completed, the respective locking pieces are joined. The present invention relates to measures to be taken when dust (not shown in FIG. 15) is generated around the base end portion 3b of No. 3. In the third embodiment, the base end surfaces 3c of the respective locking pieces 3 are not individually covered, but a plurality of locking pieces are provided under the same structure (using an adhesive, etc.) as the second embodiment. The base end face 3c is covered with one large cap 34 to prevent the dust from being exposed to the outside. This allows
It is possible to reduce the number of caps 34 to be used and the number of working steps.

In the fourth embodiment shown in FIGS. 16 and 17, in the joining of the first and second metal materials 1 and 2 using the fastening piece 3, when the joining is completed, the fastening piece is joined. What to do when dust 33 occurs around the base end portion 3b of 3 and
This is intended to improve the bonding strength between the first and second metal materials 1 and 2. All around the base end portion 3b of the locking piece 3,
As shown in FIG. 16, a flange portion 37 is provided, and after joining the first metal material 1 and the second metal material 2, the flange portion 37 hides the dust 33 as shown in FIG. Can be folded into As a result, the dust 33 can be prevented from being exposed to the outside, and the clamping force of the first metal material 1 by the second metal material 2 and the base end portion 3b of the locking piece 3 can be increased, and The bonding strength of the second metal materials 1 and 2 can be improved.

Although the embodiments have been described above, the object of the present invention is not limited to what is specified, and it is an object of the invention to provide what is described as an effect or what is described as preferable. It is also implicitly included that

[Brief description of drawings]

FIG. 1 is an explanatory view illustrating a joining method for joining a first metal material and a second metal material using a locking piece.

FIG. 2 is an operation state diagram from FIG.

FIG. 3 is an operation state diagram from FIG.

FIG. 4 is a perspective view showing the relationship between one electrode, a holder, and a locking piece sheet.

FIG. 5 is an explanatory view for explaining a locking piece sheet in a wound state.

FIG. 6 is a plan view of the locking piece sheet showing the state of each manufacturing process step.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

8 is an enlarged cross-sectional view taken along line BB of FIG.

FIG. 9 is a schematic view showing a joining device.

FIG. 10 is an explanatory diagram illustrating a joining method using a joining device.

11 is an operation state diagram from FIG.

FIG. 12 is an operation state diagram from FIG. 11.

FIG. 13 is a diagram showing a second embodiment.

FIG. 14 is a bottom view of FIG. 13;

FIG. 15 is a diagram showing a third embodiment.

FIG. 16 is a diagram showing a fourth embodiment.

FIG. 17 is an operation state diagram from FIG. 16;

FIG. 18 is an explanatory diagram showing an example of energization control for electrodes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st metal material 2 2nd metal material 3 Locking piece 4 Electrode 5 Electrode 6 Joining device 7 Locking piece sheet 8 Feed band part 9 Connecting part 10 Cut 12 Material 14 Worked part 16 Hole 24 Holding Tool 26 Locking leg 27 Through hole 28 Air blowout hole 29 Locking claw 32 Compressed air 34 Cap 35 Adhesive 36 Protrusion 37 Flange part

Claims (22)

[Claims] 1. A first metal material and a second metal material to be joined, and a cone-shaped locking piece made of the same kind of metal material as the second metal material are positioned between a pair of electrodes. With the pair of electrodes, the first and second metal materials and the locking piece are connected to the locking piece and the first and second metal materials. A method of joining dissimilar metal materials, wherein a pressure is applied to the dissimilar metal materials in a state where the tip portions are in contact with the first metal material and are overlapped with each other, wherein the locking pieces are connected to each other to be substantially orthogonal to the electrode. A method for joining dissimilar metal materials, characterized in that the locking pieces are sequentially supplied between the pair of electrodes by moving a feed member that is moved in a direction. 2. The method for joining dissimilar metal materials according to claim 1, wherein the feeding member and the locking piece are disconnected from each other by moving the electrode when the pressure is applied. 3. The feed member according to claim 1 or 2, wherein a pair of the feed members are provided so as to sandwich the electrode, and the pair of feed members are provided with the locking piece between the feed members. A method for joining dissimilar metal materials, characterized in that they are respectively connected. 4. A first and second metal material to be joined, and a cone-shaped locking piece made of the same kind of metal material as the second metallic material, and a tip portion of the locking piece. Is a method for joining dissimilar metal materials in which the first metal material and the second metal material are overlapped with each other so as to be in contact with each other, and pressure is applied to the locking piece and the first and second metal materials. A method for joining dissimilar metal materials, characterized in that air is blown in the vicinity of the contact portion between the locking piece and the first metal material during energization with pressure. 5. The first and second metal materials to be joined, and a cone-shaped locking piece made of the same kind of metal material as the second metallic material, and a tip portion of the locking piece. Is a method for joining dissimilar metal materials, wherein the disposing metal pieces are superposed so as to contact the first metal material, and pressure is applied to the locking piece and the first and second metal materials. As the stop piece, a locking piece provided with a flange portion on the entire circumference of the base end portion is prepared, and the flange portion is provided with the first portion when the pressurizing current is applied.
On the other hand, the flange portion is tilted toward the first metal material side after the pressurization and energization are completed while being separated from the metal material so that an annular closed space is formed in cooperation with the first metal material. A method for joining dissimilar metal materials, which is characterized by the above. 6. The first and second metal materials to be joined, and a cone-shaped locking piece made of the same kind of metal material as the second metallic material, and a tip portion of the locking piece. Is a method for joining dissimilar metal materials in which the first metal material and the second metal material are overlapped with each other so as to be in contact with each other, and pressure is applied to the locking piece and the first and second metal materials. A method for joining dissimilar metal materials, characterized in that, after the completion of pressurization, the entire base end portion of the locking piece is covered with a cap including the vicinity of the outside of the base end portion. 7. A pair of pressurizing current-carrying electrodes, which are arranged so as to be movable toward and away from each other and which can be in a standby position and an operating position, and a plurality of conical pyramid-shaped locking pieces are connected to each other, When the pair of pressurizing and energizing electrodes are always arranged so as to intersect with the electrodes and take a standby position, one of the plurality of locking pieces has a locking pin between the pair of electrodes. A feed member for moving the lance so that the leading end portion of the locking piece faces the leading end surface of one of the pair of pressurized energizing electrodes. Characteristic welding equipment for dissimilar metal materials. 8. The movement restricting member according to claim 7, wherein a movement restricting member is arranged in a region facing the feed member, on a side of a direction toward a tip portion of the locking piece.
An apparatus for joining dissimilar metal materials, which is characterized in that 9. A tip portion of a cone-shaped locking piece made of the same kind of metal material as the second metal material is joined to the second metal material laminated with the first metal material, In the joining structure of dissimilar metal materials, wherein the locking piece and the second metal material sandwich the first metal material, the locking piece has a flange portion on the entire circumference of the base end portion. A joint structure of dissimilar metal materials, wherein the flange portion is bent so as to form an annular closed space in cooperation with the first metal material. 10. A second overlaid with a first metallic material.
A tip portion of a cone-shaped locking piece made of the same kind of metal material as the second metallic material is coupled to the metallic material so that the locking piece and the second metallic material form the first metallic material. A joining structure of dissimilar metal materials sandwiching a metal material, wherein a cap is fixed to the first metal material to cover the entire base end portion of the locking piece including the outside of the base end portion. The structure for joining dissimilar metal materials is characterized in that 11. The joint structure according to claim 10, wherein the cap is filled with an adhesive. 12. The method according to claim 10 or 11, wherein a hole is formed in the base end surface of the locking piece, and a projection that fits into the hole is provided on the inner surface of the cap. Bonding structure of dissimilar metal materials. 13. A locking piece comprising a feeding member extending in one direction and a conical pyramidal locking piece connected to the feeding portion at predetermined intervals. Holding body. 14. The locking piece according to claim 13, wherein a pair of the feeding members are provided with a space therebetween, and the locking pieces are connected to the respective feeding members. Holding body. 15. The retaining piece holder according to claim 13 or 14, wherein a weakening line is provided between the feed member and the retaining piece. 16. The locking piece holder according to claim 15, wherein the weakening line is a cut or a thin portion. 17. The locking piece holder according to claim 13, wherein the feed member and the locking piece are wound. 18. A method of manufacturing a locking piece, characterized in that a plate-shaped material is formed into a cone shape by press working. 19. The material according to claim 18, wherein the material is intermittently conveyed as a continuously extending long member, and the material to be intermittently conveyed is first punched to be continuously formed in the extending direction of the material. Forming a feed portion element as a constituent element of a continuous feed portion and a processed portion connected to the feed portion element, and forming the processed portion into a cone shape by drawing in the next step, And a method for manufacturing a locking piece. 20. The method for manufacturing a locking piece according to claim 19, wherein a final step includes a step of winding the processed material. 21. An electrode structure for an electrode that carries out pressurization and energization, comprising a slider slidably fitted to the electrode. 22. The pair of locking leg portions are projectingly provided on the tip end surface of the slider so as to sandwich the electrode, and the electrode side is provided at the tip end portion of each of the locking leg portions. The electrode structure is characterized in that locking claws are provided so as to project toward each other.