JPH06170459A - Hemming press die and hemming method using the same - Google Patents

Abstract

PURPOSE:To enable a hemming work in a single process of a press. CONSTITUTION:A material 17 combined with an outer side material 17A and an inner side material 17B is clamped with a material receiver 18 and a material holder 12 by lowering a lower die. Further, when an upper die is lowered, a top end part 17A' of the outer side material is bent by 45 deg. by pressing a bending punch 15 which serves also as a driven cam to a left direction with a driving cam 14. Further, when the upper die is lowered, the material receiver 18 is lowered until the receiver 18 is abutted on a lower die base 20, and a bending die 21 serving also as the driven cam is retreated to a left direction by being driven with a bending punch 23 which serves also as a driving cam. Then, the top end part 17A' of the inner side material is further bent and folded with an upper end of the bending punch 23, and the hemming is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming press die and a hemming method using the same.

[0002]

2. Description of the Related Art In order to perform a hemming process (helix removing process), in the conventional technique, the first end of the work is bent 90 °.
This is performed in the process and the second process in which it is further bent at 90 ° and folded back, and different press dies are required for the first process and the second process.

FIG. 6 shows the first process of the prior art. The figure shows the upper die lowered to the bottom dead center position. 1 is a material pressing pad attached to an upper mold base (not shown),
It is urged downward by the spring 2. Reference numeral 3 denotes a drive cam attached to the upper mold base, which has an oblique cam surface 3a.

Reference numeral 4 denotes a material receiver mounted on a lower die base (not shown), 5 a bending die attached to the lower die base, and 6 a passive cam provided on the bending die 5 so as to be slidable in the left and right directions. The bending punch has a diagonal cam surface 6a.

Reference numeral 17 is a material, which is a combination of two sheets 17A and 17B. When the upper mold is lowered, the material 17 is pressed by the material receiver 4 and the material pressing pad 1, and the bending die 5 is pressed.
The inner side of the tip (lower end) of the inner material 17B abuts on the abutting portion 5a. When the upper die is further lowered, the drive cam 3 is moved by the cam surface 3a to the cam surface 6 of the bending punch 6 which also serves as a passive cam.
Bending punch 6 which drives a and also serves as a passive cam as shown in the figure.
To the left.

FIG. 1 shows a state in which the tip (lower end) portion 17A 'of the outer material 17A is bent 90 ° clockwise as indicated by the arrow. Thus, as shown in FIG. 7, the outer side 17A of the material 17 in which the tip of the outer material is bent by 90 ° in the first step is further bent by 90 ° in the second step and folded back to complete the hemming process.

In FIG. 7, reference numeral 1A denotes a material pressing pad mounted on an upper mold base (not shown), which is urged downward by a spring 2A. 4A is a material receiver mounted on a lower mold base (not shown), and is biased upward by a spring 7. Reference numeral 8 is a bending punch attached to the lower die base.

When the upper mold is lowered, the material 17 is filled with the material receiver 4
A is pressed by A and the material pressing pad 1A, and further, the bending punch 8 bends the tip portion 17A 'of the outer material 17A by 90 ° in the direction of the arrow and folds it back, and inserts the tip portion of the inner material 17B into the hemming. Finish processing.

[0009]

SUMMARY OF THE INVENTION In the above conventional technique,
There is a problem that not only separate press dies are required for the first step and the second step and die cost is required, but also because two steps are required, the processing time is long and the processing cost is high.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a hemming press die capable of solving such problems and a hemming method using the same.

[0011]

To achieve the above object, in the hemming press die of the present invention, the upper die has the following constitutional requirements (a) to (c), and the lower die has the following constitutional requirements. (D)
A press die for hemming that has the configuration requirements of (f).

(A) Mounted on the upper mold base (11),
Material pressure pad (12) biased downward by a spring (13). (B) Drive cam (1) fixed to the upper die base (11)
4).

(C) The material pressing pad (12) is mounted so as to be movable in the left-right direction, is biased to the right by a spring (16), and is also the material pressing pad (12).
On the other hand, when the drive cam (14) is relatively lowered, the bending punch (15) is also driven by the drive cam (14) and moves forward to the left, which also serves as a passive cam.

(D) A material receiver (18) supported by a cushion pin (19). (E) A bending die (21) that is mounted on the material receiver (18) so as to be movable in the left-right direction, is biased to the right by a spring (22), and also functions as a passive cam.

(F) Fixed to the lower mold base (20),
When it moves vertically relative to the material receiver (18), it also serves as a drive cam that moves the bending die (21) that also serves as a passive cam backwards and forwards to the left and right, and the outer material (17A) when the upper die descends. Bending punch (23) for folding back.

In the hemming method of the present invention, the hemming press die of the present invention is used to fold back the outer layer of the multi-layered laminated material and perform the hemming process. ) Tip (17)
The material (17) is sandwiched between the material receiver (18) and the material pressing pad (12) so that A ′) is located in front of the bending punch (15) attached to the material pressing pad (12), The bending punch (15) is advanced to move the tip (17)
A ') is bent toward the inner material (17B) side at an angle of less than 90 °, and then the tip part (17A') is further bent back by a bending punch (23) fixed to the lower mold base (20), and folded back.
The tip of the inner material (17B) is replaced with the outer material (17A)
I tried to wrap it in.

[0017]

When the material is placed on the material receiver (18) and the upper die is lowered, the material is first pressed by the material pressing pad (12). When the upper die is further lowered, the drive cam (14) drives the bending punch (15) also serving as a passive cam to move it forward to bend the tip of the material to less than 90 °.

At this time, the bending die (2
1) supports the base of the tip of the material to ensure bending. When the upper die further descends, the material receiver (18) descends together with the bending die (21) that also serves as a passive cam, and is driven by the bending punch (23) that also serves as a drive cam. Therefore, the bending die (21) that also serves as the passive cam retracts to the left and separates from the material. At the same time, a bending punch (23) that also serves as a drive cam
Further bends the tip of the material and folds it back to complete the hemming process.

In the hemming method of the present invention, the multi-layered laminated material (17) is sandwiched between the material receiver (18) and the material pressing pad (12), and the outer material (17A) is used as a bending die also as a passive cam. Bending is performed at less than 90 ° at (21), and the hemming process is completed by folding back the tip portion (17A ′) of the outer material so as to wrap the inner material (17B) with a bending punch that also serves as a drive cam.

[0020]

1 to 3, the upper die is slightly lowered from the top dead center position, FIG. 2 is further lowered, and FIG. 3 is down to the bottom dead center position. Indicates.

11 is an upper mold base, 12 is an upper mold base 11
The material pressing pad attached to the above is urged downward by the spring 13. Reference numeral 14 is a drive cam fixed to the upper mold base 11.

Reference numeral 15 is attached to the material pressing pad 12 so as to be movable in the left-right direction, is biased to the right by a spring 16, and when the drive cam 14 is lowered relative to the material pressing pad 12. Bending punch 15A, which is driven by the drive cam 14 and moves forward to the left, also as a passive cam
Is a stopper that limits the amount of retraction of the bending punch 15 that also serves as a passive cam to the right.

Reference numeral 17 denotes an outer material 17A and an inner material 1
7B is a multi-layered material, and in this case, the expression of outside / inside refers to the layer that becomes the outside at the hemmed portion as the outside, and the layer that is wrapped inside the inside as the inside.

A material receiver 18 is supported by a well-known cushion pin 19, and the lower end of the cushion pin 19 is connected to a well-known cushion (not shown) of the press machine. Reference numeral 20 is a lower die base, and 21 is a bending die which is mounted on the material receiver 18 so as to be slidable in the left-right direction and also serves as a passive cam, and is biased rightward by a spring 22. This bending die 2
1 has a pointed tip 21a. 21b is a cam surface.

A bending punch 23 fixed to the lower die base 20 also serves as a driving cam and has a cam surface 23a. The bending punch 23 also serving as the driving cam also functions as a driving cam for moving the bending die 21 serving also as the passive cam backward and forward when the vertically moving relative to the material receiver 18.

In the state shown in FIG. 1, the material receiver 18 puts the material 17 thereon, and the upper mold is slightly lowered. When the upper die further descends, the material pressing pad 12 holds the material 17 between the material receiving pad 18 and the tip 17A 'of the outer material 17A just before the front end (left end) of the bending punch 15 that also serves as the passive cam. It will be in a protruding state. And the bending die 21 that also serves as a passive cam
21a is located inside the base of the outer material tip 17A '.

When the upper die is further lowered, the drive cam 14 pushes the cam surface 15a of the bending punch 15 which also serves as a passive cam with its cam surface 14a to move the bending punch 15 forward to the left,
As shown in FIG. 2, bend the outer material tip 17A ′ by 45 °.

After this 45 ° bending, when the upper die further descends, the material receiver 18 descends, and the cam surface 23a of the bending punch 23 which also serves as a drive cam makes the bending die 2 which also serves as a passive cam.
In cooperation with the cam surface 21a of No. 1, the bending die 21 is retracted to the left against the spring 22, and the bending punch 23 further folds the tip portion 17A 'of the material and folds the material 17B inside so as to wrap it. Complete the hemming process.

In this way, the state where the upper die is lowered to the bottom dead center position and the tip portion 17A 'of the outer material 17A is hemmed to wrap the inner material 17B is shown in FIG.
An enlarged view is shown in (b).

From the state shown in FIG. 2 to the state shown in FIG. 3, the tip 21a of the bending die 21 has the outer material 17
Since the base of the tip 17A 'of A is not supported, when the material is a single layer that is not a mating material, when the tip 17A' is folded back by the bending punch 23, the vicinity of the base of the tip 17A 'may buckle. Although the shape is likely to collapse, if the material is a laminated material having two or more layers, the tip of the inner material 17B prevents the shape of the tip of the outer material 17A from collapsing as shown in FIGS. Can be finished neatly.

FIG. 4 (a) shows a hemming process using a press die of the present invention at several points on the edge of the heat insulating plate 24 of the exhaust manifold of an automobile. Reference numeral 25 indicates a hemming part. FIG. 6B is a cross section of the hemming portion, in which a heat insulating material 17C is sandwiched between the outer material 17A and the inner material 17B, and the outer material 17A is bent, folded back and hemmed. ing.

4 (a) and 4 (b) similarly show a heat insulating plate 26 of an exhaust manifold of an automobile, which is hemmed as shown by reference numeral 27, and the material is a two-layer material 17. .

[0033]

Since the press die for hemming of the present invention is configured as described above, hemming can be performed by a one-step pressing operation, which is useful for reducing die cost and machining cost.

Further, the hemming method of the present invention has the effect of neatly finishing the hemming process in a short time by one-step pressing work, and without fear that the vicinity of the tip of the material to be folded back is broken.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an embodiment of the present invention.

FIG. 3 is a vertical sectional view of an embodiment of the present invention.

FIG. 4 is a perspective view of an exhaust manifold heat insulating material for an automobile, (a) and its AA cross section (b).

FIG. 5 is a perspective view of an automobile exhaust manifold heat insulating material, (a), and its BB cross section (b).

FIG. 6 is a vertical sectional view of a conventional technique.

FIG. 7 is a vertical sectional view of a conventional technique.

[Explanation of symbols]

 11 Upper Die Base 12 Material Holding Pad 13 Spring 14 Drive Cam 15 Bending Punch Used as Passive Cam 16 Spring 17 Material 17A Outer Material 17A 'Tip 17B Inner Material 18 Cushion Pin 20 Lower Die Base 21 Bending die 22 Spring 23 Bending punch that doubles as a driving cam

Claims (2)

[Claims] 1. A press die for hemming, wherein the upper die has the following constituent features (a) to (c) and the lower die has the following constituent features (d) to (f). (A) The material pressing pad (1) attached to the upper die base (11) and urged downward by the spring (13)
2). (B) Drive cam (1) fixed to the upper die base (11)
4). (C) It is mounted on the material pressing pad (12) so as to be movable in the left-right direction, is urged to the right by the spring (16), and the drive cam (14) is relative to the material pressing pad (12). Drive cam (1
A bending punch (15) which is driven by 4) and moves forward to the left, which also serves as a passive cam. (D) The material receiver (18) supported by the cushion pin (19). (E) A bending die (21) that is mounted on the material receiver (18) so as to be movable in the left-right direction, is biased to the right by a spring (22), and that also functions as a passive cam. . (F) It is fixed to the lower die base (20) and the material receiver (1
8) is also used as a drive cam that moves the bending die (21) that also serves as a passive cam backwards and forwards to the left and right when it moves in the vertical direction relatively to the outer material (1) by lowering the upper mold.
Bending punch (23) for folding back 7A). 2. The material (17) is placed so that the tip (17A ′) of the material (17A) on the outside of the laminated plate is located in front of the bending punch (15) mounted on the material pressing pad (12). Material receiver (18) and material press pad (1
2) and the bending punch (15) is advanced to bend the tip (17A ′) toward the inner material (17B) at an angle of less than 90 °, and then to the lower mold base (20). The tip portion (17A ′) is further bent and folded back by the fixed bending punch (23), and the tip portion of the inner material (17B) is folded to the outer material (1
The hemming method using the press die according to claim 1, wherein the hemming method is configured to be wrapped with 7A).