JP2000225424A - Joining method and joining device for metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute joining excellent in strength and appearance without developing cracks by clamping and fixing a planar part by the movement of a press plate, crushing a projected cylindrical part with a press plate and a punch, spreading the crushed part in a clearance formed between the punch and a punch plate and calking it till the clearance is filled up. SOLUTION: A joining member 11 and member 12 to be joined are superposed, the hollow cylindrical part 13 penetrates a through hole and, in a state where the cylindrical part 13 is downward projected, it is placed on a punch plate 17. The press plate 19 is lowered, the joining member 11 and member 12 to be joined are clamped and fixed between itself and the punch plate 17 and they are pushed down together the punch plate 17 against the elastic force of a spring 16. By crushing the projected end part of the hollow cylindrical part 13 between the press plate 19 and the shoulder part 15b, spreading in the outside clearance 18 and calking it, it is pressurized till the clearance 18 is filled up with the crushed part. In this way, the calking is executed by a simple process, the cracks are not developed and sufficient catching and bonding strength are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method and a joining apparatus for joining a plate member by caulking a plate-like joining member and a member to be joined.

[0002]

2. Description of the Related Art Conventionally, as a means for joining a metal flat plate by caulking, for example, as shown in FIG. 5, a hollow cylindrical portion 2 is formed on one joining member 1 by burring.
The joining member 3 has a through hole 4 through which the hollow cylindrical portion 2 is inserted and projected, and a joining means for pressing and deforming the projected cylindrical portion is often employed. That is, FIG.
In the first step shown in FIG.
Then, the pressing plate 5 is lowered and pressurized between the punch 6 in the second step of FIG. 7B, and protruded from the concave portion 7 having a semicircular cross section formed on the upper surface of the punch 5. Pressing the tube part, bending it outward into a curl shape, and caulking,
Thus, the two joining members 1 and 3 are joined as shown in FIG.

[0003]

However, in the case of the above-mentioned joining means, the hollow cylindrical portion 2 needs to protrude sufficiently larger than the through hole 4 of the member 3 to be joined. 5 so as to be sufficiently caught on the back side of the member 3 to be joined.
The projecting height h is required to be three times or more the thickness t of the joining member 1 itself. Therefore, when the cylindrical portion 2 is formed by burring, a necessary projection height h is provided by ironing, but the plate thickness of the cylindrical portion 2 is extended thinly by about 10 to 20%. Are apt to cause V-shaped cracks 8. For this reason, there are restrictions and problems such as a material having high ductility and an unnecessarily large thickness t. In addition, since the side wall of the cylindrical portion 2 is stretched so as to be pulled even during the caulking, cracks 9 as shown in FIG. Therefore,
When such a crack 9 occurs, not only is the strength unfavorable, but also the end is sharp, which may injure a finger and inevitably deteriorate the appearance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and therefore has as its object to provide a method of joining plate materials which can obtain a uniform caulking structure without fear of cracks, is excellent in strength and appearance, and is easy to process. To provide a joining device.

[0005]

In order to achieve the above object, a method of joining plate materials according to the present invention comprises a pressing plate provided so as to be reciprocally movable, a punch provided facing the pressing plate, and an outer periphery of the punch. Equipped with a punch plate slidably mounted on the
A joining member having a hollow tubular portion to be joined and a member to be joined having a through hole are superimposed and set on the punch plate in a state where the tubular portion is inserted and projected through the through hole. While holding and fixing by moving the holding plate,
The protruding cylindrical portion is crushed by pressing with a holding plate and the punch, and the crushed portion is extended into a gap formed between the punch and the punch plate on the back surface side of the member to be joined, and is pressed until the gap is filled. The invention is characterized in that it is crimped (the invention of claim 1).

According to such a joining method, the portion to be caught on the member to be joined by caulking is formed by crushing the hollow cylindrical portion, and the crushed portion is filled and spread within the gap by pressurizing. By this caulking, cracks are not generated, sufficient joint strength can be obtained with uniform quality, productivity is excellent, and the protruding height of the hollow cylindrical part can be relatively small, and material restrictions are eased. Therefore, design and production can be made easier.

According to another aspect of the present invention, there is provided an apparatus for joining plate materials, comprising forming a hollow cylindrical portion in a flat joining member, and having a through hole through which the hollow cylindrical portion is inserted and projected. And a punch having a head fitted into the hollow cylindrical portion, and a slidable and elastic outside of the punch. A supported punch plate, and a presser plate provided so as to be able to reciprocate, holding and fixing both joining members overlapped by the punch plate, and pressing and crushing a cylindrical portion protruding with the punch, A continuous gap is formed between the back surface of the member to be joined and the punch and the punch plate so as to extend the crushed portion of the portion outwardly (the invention of claim 2).

[0008] According to such a configuration, the caulking process can be performed by driving the presser plate to reciprocate, so that the apparatus can be dealt with without complicating or increasing the size. A gap for extension can be formed at a required position in a desired shape, a uniform and reliable joining state can be obtained by simple caulking, and the appearance can be beautifully finished.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of the present invention; FIG. First, FIG. 2 shows a shape of a flat joining member 11 to be joined and a joined member 12 before joining.
The plate thicknesses t1, t2 of these two joining members 11, 12 are metal plates having substantially the same thickness. The joining member 11 has a cylindrical hollow cylindrical portion 13 protruding from a desired joint portion by burring. The height h1 is formed larger than the two plate thicknesses (t1 + t2). On the other hand, a circular through hole 14 into which the tubular portion 13 is inserted is formed in the member 12 to be joined.

FIG. 1 shows the two connecting members 11 and 12.
15 shows a process procedure for caulking and a part of a joining apparatus. A cylindrical punch 15 is fixed on a base (not shown). Part 15a and a flat shoulder 15b with a step
Are formed in an annular shape. A punch plate 17 is provided on the peripheral side of the punch 15 so as to be slidable in the vertical direction, and is elastically supported at the bottom through a spring 16 as an elastic body. At the upper inner surface and the shoulder 15 which is the outer surface of the punch 15.
b, a concave gap 18 is formed in an annular shape.

Such a punch 15 and punch plate 1
A presser plate 19 which can move up and down is provided facing the upper part of the punch 7 and reciprocates in conjunction with a cylinder mechanism or the like (not shown). An escape hole 19a is formed so as not to come into contact with. FIGS. 3 and 4 are an external perspective view and a cross-sectional view, respectively, showing the bonding state of the two bonding members 11 and 12 after swaging, as viewed from the rear surface side.

The joining means of the present embodiment having the above-described structure will be described with reference to the steps shown in FIG. First, in the first step of FIG. 1A, the holding plate 19 is in a standby state of the ascending position, the joining member 11 to be joined is set on the upper side, and the holding member 19 is overlapped with the member to be joined 12, so that the hollow cylindrical portion 13 Through hole 1
4 and is placed on the punch plate 17 with the cylindrical portion 13 projecting downward. In this case, the head 15a of the punch 15 is positioned by being fitted to the hollow portion of the cylindrical portion 13 and set at a predetermined position.

Next, in a second step shown in FIG. 2B, the pressing plate 19 is moved down linearly by driving a not-shown cylinder mechanism or the like. It is pinched and fixed between. Then, the holding plate 19 continues to descend, and is pressed down together with the punch plate 17 against the elastic force of the spring 16. Substantially in parallel with this, the protruding end of the hollow cylindrical portion 13 is stopped by the shoulder 15b of the punch 15 and cannot be moved downward, so that it is crushed so as to be stowed between the holding plate 19 and the shoulder 15b. Then, it is spread in the outer gap 18 and so-called caulking is performed. The pressurizing plate 19 is further pressurized until the inside of the gap 18 that is reduced by the lowering of the presser plate 19 is filled with the crushed portion. I do. However, the sheet thickness t3 extended by the caulking process is equal to the sheet thickness t3 of the joining member 11.
The volume of the gap 18 is set so as to be about 1/2 of 1, and the thickness t3 of the plate is extended outward so as to sufficiently secure the portion to be caught on the back side of the member 12 to be joined. It is required in terms of design and production. Thus, the joined members 11 and 12 that have completed the caulking process are in a tightly joined state as shown in FIGS. 3 and 4, and the outer shape of the portion of the hollow cylindrical portion 13 crushed by the caulking process is It is formed in the shape of an annular protrusion without cracks or irregular irregularities.

As described above, according to the present embodiment, the so-called linear reciprocating movement of the presser plate 19 which is driven to ascend and descend causes a simple process of caulking the joining member 11 and the member to be joined 12. In addition to the fact that the crushed and expanded portion is filled in the gap 18 as well as the squeezed portion, the crimped portion can be beautifully finished without generation of cracks, and thus may be injured by finger touch. There is no loss of appearance. Moreover, the hollow cylindrical portion 1
The protrusion height h1 of No. 3 is about twice as large as the thickness t1 of the bonding member 11, so that sufficient hooking and bonding strength can be obtained, and the range of material selection can be expanded as compared with the prior art. To In addition, the size of the gap 18 can be easily formed with a simple configuration of the punch 15 and the punch plate 17.
It has various practical effects.

In the above embodiment, the hollow cylindrical portion 13 is cylindrical, but may be oval or non-circular. In such a case, two joint members are provided at one joint. The present invention is not limited to the embodiments described above and shown in the drawings, for example, can surely prevent the sliding in the rotation direction of the present invention, and can be carried out by appropriately changing it without departing from the gist of the present invention. It is.

[0016]

As described above, the present invention can suppress the occurrence of cracks during the formation of the hollow cylindrical portion in the joining member or during the joining process, so that the appearance of the joined state is beautiful and the safety against injuries and the like is high. In addition to the increase, sufficient joint strength can be obtained with uniform quality, and the gap structure that can be filled by crushing and expanding the hollow cylindrical part of the joint member is suppressed, making design and production easy and simple. It is possible to provide a bonding method and a bonding apparatus for a plate material excellent in productivity by a simple bonding means.

[Brief description of the drawings]

FIG. 1 is a process chart showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of two plate members before joining.

FIG. 3 is an external perspective view showing a joined state.

FIG. 4 is a cross-sectional view showing a joined state.

FIG. 5 is a cross-sectional view of two sheets before joining showing a conventional example.

FIG. 6 is a diagram corresponding to FIG. 1;

FIG. 7 is a perspective view showing a different mode of the plate material before joining.

FIG. 8 is a diagram corresponding to FIG. 3;

[Explanation of symbols]

11 is a joining member, 12 is a member to be joined, 13 is a hollow cylindrical portion,
14 is a through hole, 15 is a punch, 15a is a head, 15b is a shoulder, 16 is a spring (elastic body), 17 is a punch plate, 18 is a gap, and 19 is a pressing plate.

Claims (2)

[Claims] 1. A joining member comprising: a holding plate provided so as to be able to reciprocate; a punch provided facing the holding plate; and a punch plate slidably provided on the outer periphery of the punch, and having a hollow cylindrical portion to be joined. And the member to be joined having a through hole are superimposed, and the cylindrical portion is set on the punch plate in a state where the through hole penetrates and projects through the through hole. Then, the protruding cylindrical portion is crushed under pressure by the pressing plate and the punch, and the crushed portion is extended into a gap formed between the punch and the punch plate on the back surface side of the member to be joined, and is pressed until the gap is filled. A method of joining plate materials, characterized in that they are pressed and caulked. 2. A hollow cylindrical portion is formed on a flat joining member,
A member to be joined having a through-hole through which the hollow cylindrical portion is inserted and projected is overlapped, and the projected cylindrical portion is pressed and crushed to caulk the two joined members. A punch having a portion, a punch plate slidably and elastically supported outside the punch, and a cylinder protruding with the punch, which holds and fixes the two joining members overlapped with the punch plate and is provided so as to be able to reciprocate. A press plate for pressing and crushing the portion, wherein a continuous gap is formed between the back surface of the member to be joined and the punch and the punch plate to extend the crushed portion of the cylindrical portion outward. Plate joining equipment.