JP2835608B2 - Burring caulking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burring caulking device for integrally joining a plurality of metal plates.

[0002]

2. Description of the Related Art Conventionally, in order to join a plurality of superposed metal plates, a burring device for forming a burring portion on a metal plate and then caulking the burring portion is used. This burring caulking device is generally a stem that can reciprocate under the drive of a reciprocating drive source, a burring lower mold having a hole through which the stem can enter on the movement path of the stem, and a stem capable of guiding the stem. It is configured to include an upper retainer that is relatively movable, and an anvil disposed on a moving path of the stem in place of the lower burring die. The tip of the stem is usually tapered,
The tip surface is formed flat so as to have a desired area.

In the burring crimping apparatus, a plurality of superposed plate members are arranged on a lower burring die, and burring is performed by passing a stem through the lower die.
As a result, a cylindrical burring portion is formed on the plate material to be joined. Subsequently, an anvil is disposed in place of the lower burring die, and the above-mentioned burring portion is compressed and folded between the anvil and the upper retainer, so that the plate materials to be joined can be integrally joined. is there.

[0004]

In the above conventional burring crimping apparatus, the shape of the burring portion formed on the plate material to be joined varies depending on the area of the tip end surface of the stem. For this reason, the tip surface of the stem is configured to have an optimal area based on experimental data, etc., but when subjected to actual work, the peripheral edge of the tip surface is worn and deformed and the plate material to be joined is broken. There are problems such as the loss of characteristics and the inability to use the stem early. In order to cope with this, a means of uniformly shaving the tip surface and reconstructing the peripheral edge portion is also taken, but since the tip portion of the stem is tapered, such a grinding process causes There are problems such as an increase in the area of the surface, which makes it impossible to obtain a good burring portion. In addition, since the tip of the stem is tapered, there is a problem that an error easily occurs in the diameter of the tip surface when the tip surface is processed and formed, and it is very difficult to form the tip surface to an optimum area from the beginning. It has occurred.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a burring crimping device suitable for obtaining a good burring portion while extending the life of a stem. Things. In order to achieve this object, a burring crimping device of the present invention includes a stem that can reciprocate under the action of a reciprocating drive source, a burring lower die having a hole through which a stem can enter on a movement path of the stem, An upper press that can guide the stem and move relative to the stem, and an anvil that can be disposed on a moving path of the stem in place of the lower burring die are provided. At the tip of the stem, a protrusion having a uniform cross-sectional area is formed continuously and integrally. It is preferable that the stem has a shape such that the cross-sectional area gradually decreases toward the distal end, such as a tapered shape.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 1 denotes a burring caulking device, which has a reciprocating drive source 3 arranged on a machine base 2. The reciprocating drive source 3 includes a crank mechanism 5 that converts a rotary motion by a motor 4 attached to the machine base 2 into a linear motion, and a slider 6 is connected to a tip of the crank mechanism 5. This slider 6
Is a generally sleeve-shaped upper retainer 7 guided to the front of the machine base 2.
And is slidable, and is configured to come into contact with the upper retainer 7 at the time of descending and to push it down. Further, a stem 8 is inserted through the upper retainer 7 below the slider 6, and is configured such that the tip thereof always projects from the upper retainer 7 under the bias of a spring 9.

The stem 8 is formed such that the tip of a round bar-shaped member is formed into a tapered portion 10 and the cross-sectional area gradually decreases toward the tip. A cylindrical projection 1 having a flat tip surface
1 is integrally formed. This protruding portion 11 is a shaving margin when performing a grinding operation, and the length is determined within a range of 0.5 mm to 1 mm so as to withstand several grinding operations. This is suitable for forming the burring portion 51. The diameter of the protruding portion 11 is determined based on various experiments, and is a size suitable for forming the burring portion 51 optimal for the plate material 50 to be joined.

One end of an L-shaped operating lever 12 is rotatably connected to the slider 6 via a pin 12a. The operation lever 12 is always guided by a cam groove 13a of a cam member 13 provided on the front surface of the machine base 2. Each time the slider 6 makes one reciprocation, the position at which the stem 8 can be pressed along the cam groove 13a and the pressing position are determined. It is configured to rotate to an impossible position. The operation lever 1
The pin 12a for supporting the slider 2 is fitted in the elongated hole 7a protruding from the slider 6 and provided in the upper retainer 7, so that the slider 6 is moved relative to the upper retainer 7 by the length of the elongated hole 7a. It is movable.

On the other hand, a burring lower die 18 and an anvil 19, which will be described below, are provided below the stem 8 below the machine base 2.
And a tool changing unit 14 which can be selectively arranged alternately. This tool changing unit 14 is used for the cylinder 1
5 has a slide member 16 that can be moved forward and backward by receiving the operation of the tool support 5.
Is rotatably mounted. This tool support 17
The burring lower mold 18 is symmetrical with respect to the center of rotation.
And an anvil 19 are arranged, and a pinion gear 20 is attached to a lower portion thereof via a one-way clutch 21. The pinion gear 20 meshes with a rack gear 22 attached to the machine base 2, and is configured to rotate along the rack gear 22 as the slide member 16 moves.

The burring lower die 18 is provided with the stem 8
The anvil 19 has a substantially conical projection 19a on the upper surface of a columnar member and an annular shape surrounding the projection 19a. And a folded groove.

In the burring crimping machine 1, a plate member 50 to be joined formed by superposing two metal plates is placed on the lower burring die 18 while the lower burring die 18 is arranged below the stem 8. . When the reciprocating drive source 3 is driven in a state where the operating lever 12 is rotated to a position where the stem 8 can be pressed, the slider 6 is lowered in response thereto, and the stem 8 and the upper retainer 7 are lowered integrally. Figure 5
As shown in (a), the tip of the stem 8 penetrates the plate material to be joined and reaches the burring hole 18a of the lower burring die 18. Thus, a substantially cylindrical burring portion 51 is formed in the plate material 50 to be joined.

Thereafter, when the slider 6 starts to move upward, the stem 8 and the upper retainer 7 also move upward, and the operating lever 12 rotates along the cam groove 13a to a position where the stem 8 cannot be pressed. At this time, the tool changing unit 14
Then, after the to-be-joined plate material 50 is once withdrawn, the cylinder
5 operates to move the slide member 16 backward. As the slide member 16 retreats, the pinion gear 20
Rotates along the rack gear 22, and the tool support 17 also rotates integrally with the one-way clutch 21. As a result, the positions of the lower burring die 18 and the anvil 19 are reversed. When the cylinder 15 moves backward and the slide member 16 moves forward, the anvil 19 can be arranged on the moving path of the stem 8 because the tool support 17 does not rotate due to the action of the one-way clutch 21.

After the plate 50 to be joined is placed on the anvil 19 arranged as described above, the reciprocating drive source 3 is driven again and the slider 6 is lowered.
As shown in FIG. 5B, the burring portion 51 of the plate material 50 to be joined is pressed against the projection 19a of the anvil 19, and caulked along this. At this time, the operation lever 12
Does not press the stem 8, the upper presser 7 can move relatively to the stem 8.

The plate material 50 to be joined is joined by burring and swaging as described above. If such operations are repeated, the tip of the stem 8, especially the peripheral edge of the protruding portion 10, is worn and deformed. Would. In order to form a good burring portion, the area of the distal end surface of the stem is also important, but it is also necessary that the peripheral portion of the distal end surface is not rounded. Therefore, when the peripheral portion of the protruding portion 10 is worn and deformed, workability during burring is reduced, and a good burring portion cannot be formed. However, in the burring caulking device 1, the protruding portion 10 as a shaving margin is used. Is uniformly ground again, the roundness of the peripheral portion can be removed without changing the area of the distal end surface of the stem 8, and the workability can be easily recovered.

In the embodiment of the present invention, a reciprocating drive source 3 using a crank mechanism which operates by receiving a motor drive has been described as an example. However, the present invention is not limited to this. Separate cylinders may be provided to drive the stem 8 and the upper retainer 7, respectively.

[0016]

As described above, according to the burring caulking device of the present invention, since the projecting portion having a uniform cross-sectional area is formed at the tip of the stem, the tip surface of the projecting portion is shaved and the peripheral edge thereof is formed. Even when reconfigured, the area of the tip surface does not change. Therefore, there is an advantage that the service life of the stem can be prolonged while preventing a decrease in the breaking characteristics of the plate material to be joined, and a very economical burring crimping device can be provided. In addition, since the protruding part is cylindrical, it can be processed and formed extremely easily and precisely, and the tip end surface of the stem can be precisely configured to the optimal area to form a good burring part. There are also other advantages.

[Brief description of the drawings]

FIG. 1 is an enlarged partial cutaway cross-sectional view of a main part near the tip of a stem of a burring crimping device according to the present invention.

FIG. 2 is a partially cutaway sectional view of a burring crimping device according to the present invention.

FIG. 3 is an enlarged partial cutaway sectional view of a main part of the burring crimping device according to the present invention.

FIG. 4 is an enlarged partial cutaway sectional view of a main part of the burring crimping device according to the present invention.

FIG. 5 is an operation explanatory view of the vicinity of the tip of the stem of the burring caulking device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 burring crimping device 7 upper retainer 8 stem 10 tapered portion 11 projecting portion 18 burring lower die 19 anvil

Claims (2)

(57) [Claims] 1. A stem which can reciprocate in response to the operation of a reciprocating drive source, a burring lower mold having a hole on the movement path of the stem into which the stem can enter, and a guide which can guide the stem and is relative to the stem. A burring caulking device comprising an upper retainer that can be moved to a lower position and an anvil that can be disposed on a moving path of a stem in place of the lower burring die, wherein a protrusion having a uniform cross-sectional area is formed at a tip of the stem. A burring caulking device, characterized in that: 2. The stem according to claim 1, wherein the stem has a cross-sectional area gradually decreasing toward its tip.
A burring crimping device according to claim 1.