JP2811560B2 - Metal plate joining method - Google Patents

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 a plurality of metal plates integrally.

[0002]

2. Description of the Related Art Conventionally, in order to join a plurality of metal plates, a joining method of a metal plate in which a burring portion is formed on a metal plate and then the burring portion is caulked is used. In this method of joining metal plates, first, as shown in FIG.
Between a punch guide 21 configured to be reciprocally movable and a die 23 facing the punch guide 21, a bonded plate 30 formed by stacking a plurality of metal plates is sandwiched. The burring portion 31 is formed by penetrating the guided and reciprocally movable punch 25. Next, as shown in FIG. 2B, an anvil 27 having a tapered projection 27a is arranged in place of the die 23, and the plate material to be joined is fitted with the burring portion 31 fitted into the projection 27a of the anvil 27. 30 is pressed and the burring portion 31 is crimped back along the protrusion 27a, and
0 are joined together.

[0003]

However, in the conventional burring method, the burring portion of the lower metal plate becomes longer than the burring portion of the upper metal plate when forming the burring portion. When caulking is performed, the hooked portion of the upper burring portion becomes very small, and there is a problem that the plate materials to be joined are easily separated by a weak force.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object to be joined in which a highly ductile metal plate and a low ductile metal plate are superimposed on a reciprocating punch moving path. A plate material is arranged so that a highly ductile metal plate is located on the punch side, first, a punch is penetrated through the joined plate material to form a burring portion, and then an anvil is fitted to the burring portion, and the anvil is fitted to the anvil. The burring portion is deformed and caulked along.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a punch, which is guided by a punch guide 3 and is reciprocally movable. The punch 1 has a tapered distal end and is configured to move up and down in response to the operation of a reciprocating drive source (not shown) such as a cylinder. The punch guide 3 is also connected to a reciprocating drive source (not shown) so that the punch guide 3 can reciprocate separately from the punch 1.

Reference numeral 5 denotes a die, which is provided with a hole 5a into which the tip of the punch 1 can enter. The die 5 is disposed at a position facing the punch 1 when forming a burring portion 11 on a plate 9 to be joined, which will be described in detail later. Is established. Reference numeral 7 denotes an anvil, and a tapered projection 7a is integrally formed on the upper surface.
It is arranged at a position facing the punch 1 when the burring portion 9 a of the plate material 9 to be joined is swaged.

[0007] In the embodiment of the present invention, the plate material 9 to be joined is obtained by superimposing two metal plates having different ductility. In the joining operation, the punch 1 comes into contact with the metal plate 9a having high ductility first. Thus, the metal plate 9a having high ductility is arranged on the upper side. In order to join the plate materials 9 to be joined, first, FIG.
As shown in FIG. 1A, after the plate material 9 to be joined is sandwiched between the die 5 and the punch guide 3, the punch 1 is pressed as shown in FIG.
Is lowered and the plate material 9 to be joined is punched, and burring is performed on the plate material 9 to be joined. Thus, a cylindrical burring portion 11 is formed along the punch 1 on the plate material 9 to be joined.

In the burring process described above, the punch 1
The upper metal plate 9a in contact with the metal plate 9a has a high ductility and thus extends smoothly along the tip of the punch 1. However, the lower metal plate 9b has a low ductility and breaks early. The metal plate 9b is cut off by the narrowing of the tapered portion of the punch 1 and the peripheral edge of the hole 5a of the die 5. However, by using the metal plate 9b having low ductility, the breaking by this cutting force can be further accelerated. Therefore, it is possible to obtain the burring portion 11 having an appropriate thickness without unnecessarily stretching the metal plate 9a.

In the subsequent caulking, as shown in FIG. 1C, an anvil 7 is selectively arranged in place of the die 5, and a plate material 9 which has been subjected to burring is arranged between the punch guide 3 and the anvil 7. I do. At this time, the burring portion 11 of the plate material 9 to be joined is fitted into the projection 7a of the anvil 7, and
As shown in (d), the punch guide 3 is deformed and caulked along the projection 7a by the downward movement of the punch guide 3. As aforementioned,
Since the metal plate 9b is broken at an early stage, a sufficient amount of hooking of the burring portion 11 of the metal plate 9a can be secured and caulked, and the plate material 9 to be bonded can be firmly bonded. Further, by using the metal plate 9a having high ductility and forming the burring portion 11 having an appropriate thickness as described above, it is possible to prevent the occurrence of cracks when the burring portion 11 is swaged.

In the embodiment of the present invention, the plate material to be joined is formed by superimposing two metal plates having different ductility. However, the number of metal plates is increased and these are superposed in descending order of ductility. The same effect can be obtained by using the joined plate material.

[0011]

As described above, according to the burring caulking method of the present invention, a metal plate having high ductility and a metal plate having low ductility are superimposed to form a plate material to be joined, and the plate material to be joined is formed into a ductile material. Burring and caulking are performed by placing a tall metal plate in contact with the punch first, so that the plate materials to be joined can be firmly joined and a crack occurs in the burring part with the caulking There are advantages such as that it can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method for joining metal plates of the present invention.

FIG. 2 is an explanatory view of a conventional method for joining metal plates.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punch 3 Punch guide 5 Die 7 Anvil 9 Plate material to be joined 11 Burring portion

Claims (1)

(57) [Claims] A metal plate having a high ductility and a metal plate having a low ductility superimposed on a moving path of a reciprocally movable punch, and a metal plate having a high ductility is arranged on the punch side; A burring portion is formed by passing a punch through the plate material to be joined, and then an anvil is fitted into the burring portion, and the burring portion is deformed along the anvil and caulked. Method.