JPH01245979A - Member joining method and member working device - Google Patents

Abstract

PURPOSE:To perform joining with high accuracy without strain by superposing two members having annular projections around holes and having annular grooves on peripheries of the projections on each other in opposition and melting only the annular projections to deposit and join both members. CONSTITUTION:A plate 1A made of a conductive metal plate is provided with a hole 2A and an annular projection 3A which is molten when being electrified by a resistance welding machine is provided around the hole 2A. An annular groove 4A where molten material flows is provided on the periphery of the annular projection 3A. In the same way, a plate 1B is provided with a hole 2B with the same size as the hole 2A. A pin 5 is fitted into the holes 2A and 2B and a pin groove 6 is located at the position to correspond to the mating face of the annular projections 3A and 3B and set to so that the molten material flows therein. In this state, when a current is carried from electrodes 7A and 7B, the annular projections 3A and 3B are molten and deposited on the annular groove 4A and 4B and the groove 6 to join these. By this method, the low current can do and the plates 1A and 1B are not deformed by heat.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joining method for joining members such as plate materials by welding, and a processing apparatus for said members, and particularly relates to a joining method for joining members such as plate materials by welding, and particularly to a joining method for joining members such as plate materials with high precision and high strength. The present invention relates to a joining method and a member processing apparatus for achieving the above.

[Conventional technology]

As a method for joining members using a resistance welding machine, there is a projection welding method as described in "Resistance Welding Phenomena and Its Applications" (published by the Welding Society of Japan, December 1980), pages 13 to 17. The projection welding method efficiently generates resistance heat with one energization, and enables high-precision joining with lower energy and less distortion than the general spot welding method. The strength of the joint is determined by the area of the nugget welded by resistance heat. However, increasing the diameter of the projection for the purpose of increasing strength results in the need for a large current to increase the generation of resistance heat. It will come off the joint.

Therefore, increasing the number of junctions can be considered, but in order to eliminate current shunts and efficiently generate resistance heat, the distance between junctions must be maintained at a predetermined value or more. , it is impossible to hit many points in a small area. Furthermore, a method of forming a protrusion into an annular shape and joining the protrusion has also been used. Even with this method, the strength can be increased by increasing the bonding area, but the distortion increases and a correction process is required, causing problems in terms of work efficiency, bonding accuracy, etc.

Other methods for joining parts include rivet caulking,
There are spot welding methods, heat caulking methods, etc. this house,
The rivet caulking method cannot be used when a completely flat joint is desired because the head protrudes from the joining member, and the spot welding method is difficult to form a nugget, as already evaluated in the above-mentioned "Resistance Welding Phenomenon and Its Applications". There is a problem with the position being uneven.

Additionally, thermal staking methods require distortion correction.

On the other hand, in precision punching related to the processing of parts to be joined, an annular blade with an inverted V-shaped protrusion is provided at a position away from the female hole, and this annular blade is bitten into the plate material to increase hydrostatic pressure. "Press processing know-how 1" where the method of punching holes is known
"Title 00" (January 1975, published by Nikkan Kogyo Shimbun), but this is for obtaining contour parts, and is not for actively forming annular protrusions around holes.

[Problem to be solved by the invention]

The above-mentioned conventional technology has a problem in that when joining by projection welding, if the number of joints is reduced, the distortion is reduced, but the strength is reduced. On the other hand, if the joint is made larger, the strength increases, but the distortion due to thermal deformation increases, requiring a great deal of effort to correct it.

Additionally, machining a member that has an annular protrusion around the hole and an annular groove on the outer periphery of the annular protrusion requires two processes, a hole punching process and a press forming process, which poses the problem of not increasing productivity. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to provide a member joining method that can join members with high precision and high strength without strain using a small joint, and a member processing apparatus that can precisely process members to be joined in one step.

[Means to solve the problem]

In order to achieve the above object, the present invention stacks two members facing each other and having an annular protrusion around a hole of at least one member protruding in the axial direction of the hole, so as to correspond to the mating surface of the members. The present invention proposes a member joining method in which a pin having a groove on the circumference at a position is fitted into a hole, the annular protrusion is melted, and both members are welded and joined.

A member having an annular projection may include an annular groove on the outer periphery of the annular projection.

The present invention also provides a female die in which a punched hole is formed for processing a member having an annular projection protruding in the axial direction of the hole around the hole, a male die that moves in a direction to oppose and press the female die, and a female die. In a member processing device equipped with a member presser for holding down a workpiece on a die.

The present invention proposes a member processing device in which the female mold has a protrusion on the outer periphery of the female blade at the end of the punched hole that protrudes beyond the female blade.

It is desirable that the member presser include a mechanism that moves relative to the cone so as to press the member before the cone starts pushing the workpiece.

[Effect]

In the present invention, two members having an annular protrusion around a hole and an annular groove on the outer periphery of the annular protrusion are stacked facing each other, and a groove is formed on the circumference at a position corresponding to the mating surface of the members. The pin is fitted into the hole, melting only the annular protrusion, and welding and joining both parts, so only a small current needs to be passed, and the parts do not deform due to heat, so it is possible to join with high precision without distortion. Become.

In addition, regarding the female mold of the component processing device, since a protrusion that protrudes beyond the female blade is provided on the outer periphery of the female blade at the end of the punching hole, punching of the hole and formation of the annular protrusion can be completed in one process, and one component can be made with high quality. It can be manufactured accurately and efficiently.

Furthermore, the workpiece retainer is equipped with a mechanism that moves relative to the male die to press the workpiece before the male die starts pushing the workpiece, so that the protrusions on the workpiece are formed into the correct shape as designed. be done.

Therefore, according to the member joining method and member processing apparatus of the present invention, structures such as buildings, bridges, steel houses, ships, etc. can be made accurately and quickly.

〔Example〕

An embodiment of the member joining method according to the present invention will be described with reference to FIGS. 1 and 2. FIG.

FIG. 1 shows a state in which welding is performed using a resistance welding machine. A plate material 1A made of a conductive metal plate has a hole 2A.
Around A is provided an annular projection 3A that melts when energized by a resistance welding machine. An annular groove 4A through which the melt flows is provided on the outer periphery of the annular projection 3A. Similarly, the plate material IB has a hole 2B having the same size as the hole 2A. Similarly, there is an annular projection 3B and an annular groove 4B. Bottle 5 is placed in holes 2A and 2B.
are fitted together, and the pin groove 6 is located at a position corresponding to the mating surface of the annular protrusions 3A and 3B, and is set so that the molten material can flow therein. When current is applied from the electrode 7A to the electrode 7B in this state, the annular protrusion 3A.

3B is melted and welded and joined to the annular grooves 4A, 4B and the pin groove 6. Figure 2 shows the joined state.

According to the joining method of this embodiment, the annular protrusions 3A and 3B are simply melted to form the molten material 3AB, so a small current is required.
The plate materials IA and IB are not deformed by heat. Therefore, strain-free and highly accurate joining is possible. Also, the bottle 5 is in the hole 2A.
, 2B, and the annular projections 3A and 3B are welded and joined to the pin groove 6, thereby obtaining a strong joint having a cross section of the bottle 5 and a cross section of the melt 3AB.

Note that the annular projection and the annular groove may be provided on at least one of the plate members, and the annular groove is not necessarily required if all the melted material is allowed to enter the groove on the bottle side.

Next, the holes 2A, 2B, the annular projections 3A, 3B, and the annular groove 4A.
, 4B, an embodiment of a member processing apparatus equipped with a punching die for manufacturing plate materials LA and IB having the following shapes will be described with reference to FIG. The male mold 8 is supported by a holder 9. In this holder 9, a temporary presser 11 arranged concentrically around the male mold 8 is attached to an elastic body 1.
0 and forms an upper mold together with the male mold 8. - On the other hand, the lower mold has a punching hole 13 facing the male mold 8, a flat part 14 is provided around the corner female blade 12A at the upper end of the punching hole 13, and a protruding part 15 is further provided on the outer periphery of the flat part 14. This is a female mold 12 provided in an annular shape. The shape of the protrusion 15 is defined by a small plane part 16 serving as the top, a plane part 14, and a slope 17.

FIG. 4 shows a state in the middle of the process of processing the plate material 1 using the punching die shown in FIG. When the upper mold is lowered, the pressing force of the elastic body 10 is first transmitted to the temporary presser foot 11, and the pressing force P2
Press the plate material 1 against the female mold 12 side. At this time, the protrusion 15 of the female mold 12 bites into the plate material 1. Therefore, the meat that should form the annular protrusion 3 of the plate material 1 is prevented from escaping, and the annular protrusion
When a pulling force P1 is applied to the male mold 8 in this state, a hole 2. as shown in FIG. 5 is formed in the plate material 1. Annular process 3. An annular groove 4 is formed.

In other words, the protrusion 15 bites into the plate material 1, thereby preventing the plate material 1 from plastically flowing in the direction of arrow A due to the pulling force of the male die 8. As a result, a highly accurate plate material 1 without distortion is obtained.

By the way, various shapes can be considered as the cross-sectional shape of the protrusion 17. Typical shapes are shown in FIGS. 6(a) to 6(c).
and a perpendicular surface 21. The shape shown in FIG. 6(b) has a small diameter portion 22, and the shape shown in FIG. 6(c) has a small plane portion 16 defined on both sides by slopes 17.17A.

The above explanation was about joining conductive metal plates, but 1
For example, it can be applied to joining plastics mixed with conductive fibers or conductive powder. In this case, the annular projection may be formed during molding of the plastic material, or may be formed using a heated mold.

〔Effect of the invention〕

According to the present invention, there is provided a joining method in which two plates having an annular projection protruding around a hole of at least one member in the axial direction of the hole are stacked facing each other, and only the annular projection is energized and melted. A bond without deformation can be obtained.

Moreover, since a grooved pin is fitted into the hole and simultaneously welded and bonded, a high-strength member can be realized.

Furthermore, in the processing stage, a protrusion was formed around the punching hole of the female die, and the protrusion was punched into the plate material by the male die. can be completed in one step.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the member joining method according to the present invention, and is a diagram showing a state in which welding is performed with a resistance welding machine, FIG. 2 is a diagram showing a cross section after welding is completed by the method in FIG. 1, and FIG. The figure is a cross-sectional view of a punching die used in an embodiment of the member processing apparatus according to the present invention, FIG. 6(a) to 6(c) are sectional views showing other shapes of the protrusions. LA, IB... plate material (member), 2A, 2B... hole,
3A, 3B... Annular projection, 3AB... Melt, 4
A, 4 B... Annular groove, 5... Pin, 6... Pin groove, 7A, 7B... Electrode, 8... Male mold, 9... Holder, 10... Elastic body , 11...Temporary press, 12...
・Female type. 12A...female blade, 13...pull hole, 14...flat portion. 15...Protrusion, 16...Small plane part, 17...Slope, 21...Vertical surface, 22...Small diameter part.

Claims (1)

[Claims] 1. Two members having a protrusion protruding in the axial direction of the hole around the hole are stacked facing each other, and a groove is formed on the circumference at a position corresponding to the mating surface of the two members. A method for joining members, comprising fitting a pin having a shape into the hole, melting the annular protrusion, welding and joining the two members, and causing the two members to flow into the groove. 2. The member joining method according to claim 1, wherein the member having the annular projection is provided with an annular groove on the outer periphery of the annular projection. 3. A female die in which a hole is formed in order to process a member having an annular projection projecting in the axial direction of the hole around the hole, a male die facing the female die and moving in the direction of the hole, and the female die. In a component processing device equipped with a member presser for pressing a workpiece on a die, the female die has a protrusion on the outer periphery of the female blade at the end of the punch hole that protrudes further in the member presser direction than the female blade. A component processing device characterized by: 4. The member processing apparatus according to claim 2, wherein the member holder is provided with a mechanism for moving relative to the male die so as to press the member before the male die starts pushing the workpiece. Characteristic parts processing equipment.