JPH0796335A - Calking device - Google Patents

Abstract

PURPOSE:To provide a strong joining by suppressing the escape of members to be joined. CONSTITUTION:In a calking device where the calking of the members to be joined is realized by pushing a part of a plurality of stacked members 4, 4 to be joined into a recessed part 20 on the surface of the die 2 by a punch 1, a work press 3 to press the periphery of the calking part in the members 4, 4 to be joined to the dies 2 side is arranged in the periphery of the punch 1. The work folder 3 prevents the floating due to the escape of the periphery of the calking part, and the biting in the peeling direction can be formed in the interface of the members to be joined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caulking device for caulking and joining materials to be joined by pushing a part of a plurality of materials to be joined which are superposed on each other into a concave portion of a die surface by a punch.

[0002]

2. Description of the Related Art A conventional caulking device is shown in FIG. A concave portion 20 is formed on the surface of the die 2, and the two bonded materials 4 and 4 arranged on the die 2 in a stacked state.
Is crimped by being pushed into the recess 20 by the punch 1.

[0003]

At this time, conventionally, only the size of the punch 1 and the diameter of the recess 20 of the die 2 are set in consideration of only the separating function of the materials to be joined after caulking. As a result, during caulking, as shown in FIG. 4, the periphery of the caulking portion of the materials 4 and 4 to be welded escapes upward from the surface of the die 2 to cause an uplift as shown by 5 in the figure. 4 The biting in the peeling direction of the 4 boundary surface is not formed, and strong bonding may not be performed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a caulking device capable of suppressing the escape of the materials to be bonded and performing a strong bonding.

[0005]

SUMMARY OF THE INVENTION The present invention, however, is directed to a caulking device for caulking and joining a material to be welded by pushing a part of a plurality of the materials to be welded, which are to be joined, into a concave portion of the die surface by a punch. It is characterized in that a work holder for pressing the periphery of the crimped portion of the material to be joined to the die side is arranged around the punch.

[0006]

According to the present invention, in order to prevent the work holder from being lifted due to escape around the caulking portion, it is possible to form a bite in the peeling direction on the boundary surface of the materials to be joined. At this time, it is preferable that the pressing force by the work pressing can be set to an optimum value depending on the thickness and material of the materials to be joined, the diameter of the caulked portion, and the like.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiment. In FIG. 2, reference numeral 1 is a punch set in a pressure press, and an annular work holder 3 is provided around the punch 1. A plurality of disc springs 35 are arranged so as to be slidable up and down with respect to the punch 1 and arranged between the punch 1 and a spring receiver 15 and are biased downward. In the figure, 36 is a guide pin for vertically sliding guides, 37 is a cylinder that surrounds the periphery of the disc spring 35, and the upper end of the cylinder 37 is brought into contact with the upper surface of the spring receiver 15 to lower the work holder 3. A stopper 38 that limits the amount of protrusion is provided.

If the punches 1 provided with the work holder 3 and the dies 2 provided with the recesses 20 corresponding to the punches 1 are to be caulked, the members 4 and 4 to be joined are caulked. As shown in FIG. 1, the peripheral upper surface of the caulked portion of the members to be joined 4 and 4 pushed into the recess 20 of the die 2 by the punch 1 is moved to the die 2 side by the pressure set by the disc spring 35 by the work retainer 3. Since this portion does not escape and float up due to being pushed, for this reason, a bite 40 in the peeling direction due to the flow in the outer peripheral direction is formed at the boundary surface of the materials 4 to be joined, It is what is joined.

The force applied to the work holder 3 is appropriately set depending on the material and thickness of the members to be welded 4, 4 and the diameter of the caulked portion. For example, the members to be welded having a thickness of 2.3 to 3.2 mm When performing the crimping of 4 and 4, and the pressing pressure for crimping is 16 to 17 tons, the pressing force applied by the disc spring 53 is 500 to 2000 kgf. FIG. 3 shows another embodiment, in which the work holder 3 is made of an elastic material such as urethane rubber.

[0010]

As described above, in the present invention, in order to prevent the work holder from being lifted due to escape around the caulking portion, it is possible to form a bite in the peeling direction at the boundary surface of the material to be joined, and to make a strong The joining can be surely obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing the operation of the present invention.

FIG. 2 is a sectional view of an example.

FIG. 3 is a sectional view of another embodiment.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Punch 2 Die 3 Workholding 4 Material to be bonded 20 Recess

Claims (1)

[Claims] 1. A caulking device for caulking and joining a material to be welded by pressing a part of a plurality of superposed materials to be welded into a concave portion of a die surface by a punch, and a caulking portion of the material to be welded around the punch. A caulking device, which is provided with a work holder for pressing the periphery of the die toward the die side.