JPH01202320A - Hemming machine - Google Patents

Abstract

PURPOSE:To prevent a damage from occurring in a product by combining a driving cam piece and a cam holding member to a preliminary bending driver and withdrawing the driving cam piece from the most projection position when an upper die rises after a preliminary bending. CONSTITUTION:The driving can piece 4 which is nearly octagonal when it is viewed from the side is arranged in a cam storage chamber 2 for the cam holding member 1, supported freely rotatively by an axis pin 3 and energized upward by a tensile coil spring 13. The cam holding member 1 belonging to an upper die is lowered and a cam-follower 15 is moved to carry out preliminary bending. Successively, the cam follower 15 is returned by the lowering of the holding member 1 to the initial position to carry out a main working. Then, when the upper die is elevated, the driving cam piece 4 is rotated against the spring force of the spring 13, the amount of advance of the preliminary bending punch is educed and the preliminary bending punch is prevented from touching the product. In this way, the defects are prevented from occurring in the product.

Description

[Detailed Description of the Invention] LIL Summer Hozu 1 The present invention involves pre-bending the edge of a metal plate that has been bent in advance using a pre-bending punch located on the upper side in the bending direction. The present invention relates to an edge bending device that performs hemming using a bending punch belonging to the present invention.

An edge bending device with a structure shown in Figs. 1 and 2 is used to hem the edge of a metal plate such as the exterior plate of a car body of a Natsumi-Nira Automobile. Are known.

The illustrated edge bending device 01 consists of an upper mold 02 and a lower mold 03. The upper die 02 includes a preliminary bending drive body 05 (having a drive cam 06 at the tip) and a main bending punch 07 that protrude downward from the upper die body 04, and the lower die 03 has a die integrated with the lower die body 08. 09 and the protruding piece 0 of the lower die main body 08
A pre-bending punch base 012 (having a pre-bending punch 013 and a cam follower 014) is swingably supported by a support shaft 011 on a support shaft 011, and a tension coil spring 01. 5.

The operation mode of the edge bending processing device 01 is as follows.

(2) A metal plate 016 is placed on the die 09. The edge portion 017 of the metal plate 016 is bent in advance at a substantially right angle to take an upright position. The upper mold 02 is at the upper limit position, and the lower mold 0
The preliminary bending punch 013 belonging to 3 is a tension coil spring 0
15 and is in the retracted position (Fig. 1).

■In the process of lowering the upper mold 02, first the drive cam 06 contacts the cam follower 014, the pre-bending bunch base 012 swings about the support shaft 011, and the pre-bending punch 013 advances toward the die 09 and edges Pre-bend part 017 (FIG. 2).

■ When the upper die 02 further descends and the driving cam 06 comes off the cam follower 014, the pre-bending punch base 012 and the pre-bending punch 013 return to their initial positions due to the urging force of the tension coil spring o15 (2nd N: point (dashed line).

The upper die 02 continues to descend, and the final bending punch 07 presses the pre-bent edge 017 to perform the final bending process (dotted chain line in Figure 1).

In the edge bending device 01 that operates as described above,
After the hemming process of the metal plate 016 is completed, the upper die 02 is raised, but at this time the drive cam 06 is moved to the cam follower 014.
to re-drive the pre-bending punch base 012 and the pre-bending punch 013. Therefore, the drive punch 013 hits the rounded bent edge of the metal plate 016 after processing is completed, causing damage to the metal plate 016 and resulting in a loss of quality.

The present invention was devised under such circumstances, and the edge of the metal plate placed on the die belonging to the lower die is bent in advance. With an edge bending device that pre-bends the bent edge using a pre-bending punch located on the upper side in the bending direction, the hemming process is performed using a main bending punch belonging to the upper mold. The purpose is to configure the pre-bending punch so that it will not be driven again and hit the product metal plate when rising.

・ This purpose is that the pre-bending drive body belonging to the upper mold is composed of a drive cam piece and a cam holding member that holds it as main members, and the drive cam piece moves forward and backward through a support shaft. It is displaceably supported by a cam holding member and urged upward by a resilient member, and when the upper die is lowered, the driving cam piece drives the preliminary bending punch to perform preliminary bending,
This is achieved by providing an edge bending device in which the drive cam piece is moved back from the most protruding position in contact with the pre-bending punch when the upper die is raised, against the biasing force of the resilient member. Ru.

Moxibustion-1=1 Hereinafter, one embodiment of the present invention shown in FIGS. 3 to 6 will be described.

Most of the structure of the edge bending device according to this embodiment is the same as the edge bending device 01 shown in FIGS. 1 and 2, and different structural parts are shown in FIGS. 3 to 6. Ta. Reference numeral 1 denotes a cam holding member of a pre-bending drive body belonging to the upper die. A cam storage chamber 2 is formed at the lower end of the cam holding member 1, and a driving cam piece 4 rotatably supported by a shaft pin 3 is attached to the cam holding member 1. It is stored in storage chamber 2. The drive cam piece 4 has a rectangular shape when viewed from the side, and has a first surface 51 and a stepped second surface 6.
．． Third side 7. Fourth side 8. Fifth side 9. Sixth side 10° Seventh side 11. It has an eighth surface 12, the first surface 5 of which is the cam storage chamber 2.
The sixth surface 10 is in contact with the earthen wall of the cam storage chamber 2 and is biased upward by a tension coil spring 13. The biasing force by the tension coil spring 13 acts as a moment that rotates the drive cam piece 4 around the shaft pin 3 (rotation in the counterclockwise direction in FIG. 3), and the sixth surface 10 is in the cam storage chamber during normal operation. It is pressed against the earthen wall of No.2.

On the other hand, a cam follower 15 (cam roller) that contacts the drive cam piece 4 is attached to a pre-bending punch base 14 that is integrally provided with a pre-bending punch, similar to the edge bending device 01.

The operation mode of the edge bending device according to this embodiment is as follows.

■Operating state■...The cam holding member 1 that bends to the upper mold is the first
When the pre-bending drive body 05 shown in the figure descends from the upper limit state, the inclined fourth surface 8 of the drive cam piece 4 hits the cam follower 15 attached to the pre-bending punch base 14 belonging to the lower die. contact (Figure 3).

■Operating status■...When the cam holding member 1 further descends,
The cam follower 15 is pushed by the inclined fourth surface 8 of the drive cam piece 4, the pre-bending punch base 14 supporting the cam follower 15 swings toward the die, and the fifth surface 9 of the drive cam piece 4 is pushed against the cam follower 15. (Figure 4). In this state, preliminary bending is performed using a preliminary bending punch (same as in Figure 2).
. During this time, the reaction force acting on the drive cam piece 4 from the cam follower 15 is transmitted from the fifth and seventh surfaces 11 to the inner wall of the cam storage chamber 2, and the drive cam piece 4 does not rotate around the shaft pin 3. do not have.

■Operating state■... As the cam holding member 1 continues to descend, the cam follower 15 detaches from the fifth surface 9 and escapes along the inclined sixth surface 10, and the pre-bending punch base 14. The cam follower 15 returns to its initial position (FIG. 5). After this, the cam holding member 1 further descends, and the driving cam piece 4 separates from the cam follower 15, resulting in a state similar to that shown in FIG.

■Operating state IV: When the cam holding member 1 rises after reaching the lower limit position, the driving cam piece 4 is in the same state as shown in FIG.
The sixth surface 10 of the cam follower 15 is in contact with the cam follower 15, and the driving cam piece 4 is pushed downward due to the contact relationship, and rotates clockwise against the spring force of the tension coil spring 13 as shown in FIG. The drive cam piece 4 moves upward while pushing the cam follower 15 with the second surface 6 in contact with the side wall of the cam storage chamber 2. During this time, the cam follower 15 is pushed and the cam holding member 1 and the pre-bending punch are driven again, but the cam follower 15. The amount of advance of the cam holding member 1 and the pre-bending punch is determined at the time of initial drive (Fig. 4), considering the shape of the drive cam piece 4, which has the maximum outer diameter between the first surface 5 and the fifth surface 9.
(In FIG. 6, the two-dot chain line indicates the position of the drive cam piece 4 during initial drive.) When the cam holding member 1 and the drive cam piece 4 continue to rise, the drive cam piece 4 is separated from the cam follower 15, and the drive cam piece 4 is pulled back by the elastic restoring force of the tension coil spring 13 to take the position shown by the two-dot chain line.

The features of this embodiment are as follows.

■When the cam holding member 1 descends, the drive cam piece 4 does not rotate due to the contact relationship with the cam follower 15, and when the cam holding member 1 rises, the drive cam piece 4 does not rotate due to the contact relationship with the cam follower 15. rotates, and the amount of protrusion of the drive cam piece 4 becomes smaller. Therefore, the variable position of the pre-bending punch during re-driving is smaller than the variable position during driving, and the product metal plate after the hemming process is pre-bent. Since the product is not hit by a punch, damage to the product is prevented, and quality can be improved.

■There is no need for special adjustment of the edge bending device to reduce the displacement position of the pre-bending punch when it is re-driven compared to the displacement stone when it is driven, reducing the number of adjustment man-hours compared to conventional similar equipment. obtain.

FIGS. 7 and 8 show modified examples.

The drive cam piece 4A housed in the cam storage chamber 2A of the cam holding member 1A is supported so as to be vertically displaceable by a shaft pin 3Δ, and is biased upward by a tension coil spring 13A. The drive cam piece 4A is supported by the shaft pin 3A in the inclined oblong shaft hole 4d, and the spring force of the tension coil spring 13A positions the shaft pin 3A at the lower end of the shaft hole 4d during normal times. It is pressed against the clay wall of the cam storage chamber 2A, and a gap A is created between the side wall and the lower wall of the cam storage chamber 2A. Additionally, the tip of the drive cam piece 4A has three drive surfaces (
An inclined first surface 4a and a vertically oriented second surface 4b.

An inclined third surface 4c) is formed.

FIG. 7 shows a state in which the first surface 4a of the drive cam piece 4A is in contact with the cam follower 15A during the process of the cam holding member 1A descending, and as the cam holding member 1A continues to descend, the second surface 4b and third surface 4C are brought into contact with the cam follower 15A. However, the drive cam piece 4A
is pressed against the earthen wall of the cam storage chamber 2A and is immovable.

Note that the time when the second surface 4b comes into contact with the cam follower 15Δ is the maximum stroke of the preliminary bending punch.

FIG. 8 shows that in the process of the cam holding member 1Δ rising, the fifth surface 4C of the drive cam piece 4A comes into contact with the cam follower 15A, and the reaction force causes the drive cam piece 4 to come into contact with the side wall and lower wall of the cam storage chamber 2A.
A is shown in a pressed state. The shaft pin 3A is located at the upper end of the shaft hole 4d, and a gap B is created between the drive cam piece 4A and the upper wall of the cam storage chamber 2A, and the fifth surface 4b
The amount of retraction corresponds to the gap length (ρ) in FIG. Therefore, when the cam holding member 1A continues to rise and the second surface 4b contacts the cam follower 15A, the re-driving stroke of the preliminary bending punch is a distance (
1) is smaller, and as in the previous embodiment, the product metal plate is prevented from being hit after processing is completed.

As is clear from the above description, the pre-bending drive body belonging to the upper die is composed of a drive cam piece and a cam holding member that holds the drive cam piece as its main members, and the drive cam piece is It is supported by a cam holding member so as to be movable back and forth via a shaft, and is urged upward by a resilient member, and when the upper mold is lowered, the drive cam piece drives the pre-bending punch to perform the pre-bending process. An edge bending device has been proposed in which the drive cam piece is moved back from the most protruding position against the biasing force of a resilient member in contact with the preliminary bending punch when the upper die is raised. Ta.

According to the edge bending device, the re-driving stroke of the pre-bending punch in the process of the pre-bending drive body being raised is smaller than the stroke of the pre-bending punch in the process of the pre-bending drive body being lowered, and the machining process is improved. Product quality is improved because the finished product metal plate is not hammered by the pre-bending punch.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a known edge bending device in a non-processing state, FIG. 2 is a diagram showing a state of the edge bending device in processing, and FIGS. FIGS. 7 and 8 are diagrams showing main parts and operating modes of an edge bending apparatus according to an embodiment of the invention, and FIGS. 7 and 8 are diagrams showing main parts and operating modes of an edge bending apparatus according to a modification example. . 1... Cam holding member, 2... Cam storage chamber, 3...
Axis pin, 4... Drive cam piece, 5... First surface, 6...
・Step-shaped second surface, 7...Third surface, 8...Fourth surface, 9
...Fifth side, 10...Sixth side, 11...Seventh side,
12... Eighth surface, 13... Tension coil spring, 14
...Preliminary bending punch base, 15...Cam follower,
16...Tension coil spring.

Claims (1)

[Claims] The edge of the metal plate placed on the die belonging to the lower die is bent in advance, and the bent edge is pre-bent with a pre-bending punch positioned upward in the bending direction. In an edge bending device that performs hemming using a main bending punch belonging to the upper die after bending, the preliminary bending drive body belonging to the upper die holds the drive cam piece and the cam holding member that holds it as the main members. The drive cam piece is supported by a cam holding member via a support shaft so as to be movable back and forth, and is biased upward by a resilient member, so that when the upper die is lowered, the drive cam piece moves forward and backward. Preliminary bending is performed by driving a pre-bending punch, and when the upper die is raised, the driving cam piece is moved back from the most protruding position in contact with the pre-bending punch against the biasing force of the resilient member. Edge bending processing equipment.