JP2001252730A - Method and apparatus for roll hemming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll hemming method and its apparatus efficiently conducting roll hemming by conducting roll hemming of a character line part without changing a large diameter roller and a small diameter roller each other by a robot. SOLUTION: A roller 12 consists of a two step roller having a large diameter part 13 and a small diameter part 14, an outer peripheral flange Pf of an outer panel Po is prelimirarily bent the large diameter part 13 of the roller 12 and then an outer peripheral flange Pf of general parts 210, 220 except a character line part 200 is substantially bent by the large diameter part 13 of the roller 12, further, the character line part 200 is substantially bent the small diameter part 14 of the roller 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for roll hemming, in which an upright flange of an outer panel is bent toward an inner panel by a roller to integrate the outer panel and the inner panel. The present invention relates to a roll hemming method and an apparatus for efficiently processing a character line portion having a small radius of curvature without changing a roller by a robot, comprising a two-stage roller having a small diameter portion and a roller.

[0002]

2. Description of the Related Art As a conventional roll hemming method and apparatus 100, as shown in FIG.
Place the outer panel Po with the upright standing on the lower mold 150,
An inner panel Pi is further placed on the outer periphery of the inner panel Pi.
Pg is placed so as to abut against the outer peripheral flange Pf of the outer panel Po, and as described in Japanese Patent No. 2693282, a three-dimensional roller support portion 120 provided at the tip of the robot arm 111 of the robot 110 is provided. A roll hemming technique has been proposed in which the outer panel Po and the inner panel Pi are integrated by bending the outer peripheral flange Pf of the outer panel Po toward the inner pannel Pi by the pressing force of the roller 130 movably mounted. .

The outer peripheral flange of the outer panel Po
In order to bend the Pf to the inner panne Pi side, first, a so-called preliminary bending is performed in which the outer peripheral flange Pf is bent at an angle, and then the final bending is performed, whereby the outer peripheral flange Pf is bent.
Is bent toward the inner panel Pi. Conventionally, in order to perform this preliminary bending, Japanese Patent Publication No. 7-90299
As described in the publication, the roller 130 is attached to the lower die 150.
A roll hemming apparatus provided with a guide surface 151 for guiding the roll has been proposed.

[0004] From the viewpoint of the quality of the roll hemming process and the processing speed, the preliminary bending and the main bending of the roll hemming process are often performed using the large-diameter roller 130. That is, as shown in FIG. 6, the outer panel is formed by rolling the large-diameter roller 130 rotatably supported by the roller supporting portion 120 attached to the tip of the robot arm 111 on the guide surface 151 of the lower die 150. The outer peripheral flange Pf of Po is pressed to the inner panel Pi side to perform the pre-bending all around, and then, as shown in FIG. 7, the large-diameter roller 130 is erected and the inclined outer peripheral flange Pf is moved outside the inner panel Pi. The roll hemming process is performed by performing the main bending on the peripheral edge Pg.

[0005] By the way, in many cases, a cover panel of an automobile subjected to roll hemming, that is, a front and rear side door panel, a back door panel, a hood panel, a trunk lid and the like are provided with a character line determined by the design of the automobile. Specifically, in the case of the door panel D shown in FIG. 9, a substantially horizontal character line Cl is provided at substantially the center of the outer panel Po in the vertical direction, and the front and rear end portions of the door panel D to be roll-hemmed are provided. The character line 200 has been reached. FIG. 10 is an enlarged sectional view of the character line section 200.

That is, the character line portion 200 before and after the door panel D is provided with a step of 5 to 6 mm from the upper general portion 210 so that the lower general portion 220 has an inclined portion 230 of about 45 °.
Connected with. Therefore, the convex corner portion 23 having a small radius of curvature is formed inside by the upper general portion 210 and the inclined portion 230.
1 is formed, and a concave corner portion 232 having a small radius of curvature is formed inside by the lower general portion 220 and the inclined portion 230,
These corners 231 and 232 are continuous with the character line Cl.

However, since the diameter of the large-diameter roller 130 is about 100.phi.
When the character line portion 200 is to be roll-hemmed, the outer peripheral surface of the large-diameter roller 130 does not reach the corner portion 232 in the final bending as shown in FIG. Is the corner 232
In the vicinity of the above, there is a problem that it is not bent sufficiently and remains in a floating state.

For this reason, in the conventional roll hemming process, the preliminary bending is performed over the entire circumference of the hemmed material W using the large-diameter roller 130, and the upper and lower general portions 210 and 220 having a long working distance during the main bending are large. In the character line section 200, the robot arm 111 temporarily places the large-diameter roller 130 in the roller standby section 180, and switches to the adjacent small-diameter roller 140, as shown in FIG. Thus, only the character line portion 200 is fully bent.

When the main bending of the character line section 200 is performed by the small-diameter roller 140, the outer diameter of the small-diameter roller 140 is about one unit of that of the large-diameter roller 130, as shown in FIG.
Therefore, the outer peripheral flange Pf is fully bent to a position closer to the corner 232 than in the case of the large-diameter roller 130, and the floating state of the outer peripheral flange Pf is reduced as much as possible.

Therefore, in the case of a door panel D in which a character line Cl passes before and after as shown in FIG. After the preliminary bending of the lower general portion 220 and the other character line portion 200, that is, the preliminary bending of the entire circumference, is switched to the small-diameter roller 140, and as shown in FIG. The main bend 200 and the other character line portion 200 must be fully bent, and the large-diameter roller 130 should be used again to carry out the main bend of the upper general portion 210 and the lower general portion 220 by the large-diameter roller at least twice. It is.

However, in this method, the large-diameter roller 130
Of the outer peripheral flange Pf in a state where the entire circumference is preliminarily bent by
The outer peripheral flange Pf near the character line portion 200 is fully bent by the small-diameter roller 140, and is then switched to the large-diameter roller 130 and is preliminarily bent to form the upper and lower general surfaces 2
In order to fully bend the outer peripheral flanges Pf of the main body 10 and 220, the outer peripheral flanges Pf in the vicinity of the character line portion 200 are extended so that the outer peripheral flanges of the upper and lower general parts 210 and 220 have a longer length.
It can be easily absorbed by Pf.

As another method for reducing the number of times of hand-holding and reducing the loss time, firstly, the entire circumference is preliminarily bent by the large-diameter roller 130, and then the characters on both sides are held while the large-diameter roller 130 is held. Line section 200
The main bending of the upper general portion 210 and the lower general portion 220 excluding the above is performed, and thereafter, the main bending of one character line portion 200 and the main bending of the other character line portion 200 are performed by switching to the small-diameter roller 140. Can also be adopted.

However, according to this method, the outer peripheral flanges Pf of the upper and lower general portions 210 and 220 are extended with respect to the outer peripheral flange Pf of the character line portion 200 that has not been fully bent. When the outer peripheral flange Pf of the character line portion 200 is fully bent, the outer peripheral flange Pf is compressed, but is not compressed to the original state, and the surplus portion becomes a fold and is generated at the corner portion 232.
Therefore, since the latter method is not a preferable processing method, the former method is generally performed, and the former method requires at least two changeovers. Each time the robot 110 is changed, the robot 110 must reciprocate between the outer peripheral flange Pf of the outer panel Po and the roller standby unit 180 to move the robot arm 111.
This round-trip time was a loss time.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a roll line hemming process for a character line portion without changing a large-diameter roller and a small-diameter roller by a robot. An object of the present invention is to provide a roll hemming method and a roll hemming method capable of performing roll hemming processing well.

[0015]

According to a roll hemming method according to the present invention, an inner panel is placed on an outer panel having a character line portion in the middle and having an outer peripheral flange raised, and the outer peripheral flange of the outer panel is attached to the outer panel. In a roll hemming method for integrating the outer panel and the inner panel by folding the inner panel side with a roller, the roller is constituted by a two-stage roller having a large-diameter portion and a small-diameter portion, and the outer peripheral flange of the outer panel is formed. After preliminary bending at the large diameter portion of the roller, the general portion having a large radius of curvature excluding the character line portion is fully bent at the large diameter portion of the roller, while the character line portion having a small radius of curvature is a small diameter portion of the roller. The main bend is performed. Therefore, the entire circumference is preliminarily bent with a large-diameter roller, and the character line portion having a small radius of curvature is continuously bent with a small-diameter roller without changing the roller,
Roll hemming can be performed by continuously bending a general portion having a large radius of curvature with a large-diameter roller without holding the roller again, so that the working efficiency can be improved.

Further, in the roll hemming device according to the present invention, the inner panel is placed on an outer panel having a character line portion in the middle and having an outer peripheral flange raised, and is guided by a guide surface provided on a lower die. By roller
In a roll hemming device in which the outer flange of the outer panel is preliminarily bent to the inner panel side and then the outer flange is fully bent by the roller to integrate the outer panel and the inner panel, the roller is preliminarily bent at the outer flange of the outer panel. And a two-stage roller having a large-diameter portion for fully bending the general portion excluding the character line portion and a small-diameter portion for fully bending the character line portion, and corresponding to the lower-type character line portion. The portion where the roller is to be bent is provided with a concave portion for avoiding interference with the large diameter portion of the roller when the character line portion is fully bent at the small diameter portion of the roller. Therefore, when the character line portion is fully bent at the small diameter portion of the roller, interference between the large diameter portion of the roller and the lower mold can be prevented, and the movement of the roller can be allowed. Therefore, switching from the large diameter portion to the small diameter portion of the roller can be performed smoothly without any obstacle, and the roll hemming process can be performed efficiently. Further, since the roller is a two-stage roller having a large-diameter portion and a small-diameter portion integrally with each other, compared with a case where the small-diameter roller and the large-diameter roller are formed separately, a roller waiting place is unnecessary, and Since the operating range of the robot arm for holding the roller to its standby position is also reduced, the equipment cost can be reduced and the installation space for the equipment can be reduced.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method and an apparatus for roll hemming according to the present invention will be described below with reference to the drawings. Here, FIG. 1 is a cross-sectional side view showing a use state of the roll hemming device of the present invention, FIG. 2 is a cross-sectional side view at the time of starting a main bending by a small diameter portion of the roller, and FIG. FIG. FIG. 4 is a partial perspective view showing the main bending operation of the character line portion by the small diameter portion of the roller, in which the large diameter portion of the roller is omitted. Note that components that have not been changed from the prior art will be described with the same reference numerals.

First, as described in the prior art with reference to FIG. 5, the roll hemming method and apparatus according to the present invention includes a roller support portion 120 fixed to a base 190 and attached to the tip of a robot arm 111. It is composed of a robot 110 and a lower mold 50 that is also fixed to the base 190 and has an outer panel Po and an inner panel Pi, which are hemming materials W, mounted thereon. The roller 12 unique to the present invention is supported by the roller supporting portion 120.

First, the support structure of the roller 12 will be described. The roller 12 has a large-diameter portion 13 and a small-diameter portion 14 integrally formed to form a two-stage roller.
The support shaft 124 rotatably supports the roller support 120. That is, as shown in FIG.
The roller 12 is supported on the head side of the roller 24 via a bush 123, a support shaft 124 is inserted through a collar 122 between the bush 123 and the roller support 120, and the support shaft 124 is It is inserted into a roller support hole 121 provided in 120, and the protruding portion is fastened and fixed by a nut. That is, the roller 12 of the present embodiment is not formed of two types of large and small separate rollers, but is formed by integrally forming rollers having different diameters as two-stage rollers. The hemming device 10 performs the same function only by switching between the application of the large-diameter portion and the application of the small-diameter portion of a single roller without switching between the large-diameter roller and the small-diameter roller. Note that the diameter of the roller 12 of the present embodiment is
As before, the large diameter portion 13 is 100φ, and the small diameter portion 14 is 3 mm.
0φ.

Next, the structure of the lower mold 50 will be described with reference to FIGS. An inclined guide surface 51 for preliminarily bending the outer peripheral flange Pf of the outer panel Po by the roller 12 is formed on the outer periphery of the lower die 50. As shown in FIG. 3, this preliminary bending is performed on the entire periphery of the outer peripheral flange Pf of the outer panel Po, that is, the hemmed material W shown in FIG.
In the example of the door panel D, the upper and lower general sections 21
The entire circumference including the 0, 220 and front and rear character line portions 200 is performed by the large diameter portion 13 of the roller 12. That is, the roller 12 is inclined such that the outer peripheral surface of the large-diameter portion 13 is in contact with the guide surface 51 of the lower die 50 and is inclined at an end of the large-diameter portion 13 while bending the flange Pf in an inclined manner.
Move along.

When the preliminary bending of the entire circumference is completed, the robot 1
The reference numeral 10 moves the roller 12 to the character line portion 200, and performs the main bending of the preliminarily bent outer peripheral flange Pf of the character line portion 200 by the small diameter portion 14. That is,
As shown in FIG. 2 and FIG.
The small-diameter portion 14 is made to contact the preliminarily bent outer peripheral flange Pf and the guide surface 51 in an inclined manner, and then the roller 12 is erected and the outer peripheral flange Pf is fully bent. As described above, when the roller 12 is inclined and the small-diameter portion 14 comes into contact with the guide surface 51, the large-diameter portion 13 enters a state below the guide surface 51.

Therefore, the lower die 50 is provided with the large diameter portion 13.
Recess 52 is provided to prevent interference with That is, the inclined surface 521 is provided at an angle slightly larger than 90 ° below and inside the guide surface 51, and the large-diameter portion 1 of the roller 12 is formed.
The concave surface 52 is formed by forming the vertical surface 522 at a depth that does not cause interference with the vertical surface 3 and continuing the horizontal surface 523. Therefore, the roll hemming device 10 of the present embodiment
Since the concave portion 52 is provided in the lower die 50, even when the character line portion 200 is fully bent by the small diameter portion 14 of the roller 12, the large diameter portion 13 and the lower die 50 do not interfere with each other. is there.

Next, a roll hemming method using the roll hemming apparatus of the present embodiment will be described. Robot 11 used in roll hemming device of the present embodiment
Although 0 may be the same as the conventional one, the teaching to the robot 110 for performing the roll hemming is different from the conventional one. That is, the teaching to the robot 110 for the conventional roll hemming process is generally performed by first performing a preliminary bending on the entire circumference with the large-diameter roller 130, and then switching from the large-diameter roller 130 to the small-diameter roller 140. Roller 130 is moved to roller standby section 18
0, hold the adjacent small-diameter roller 140, perform the main bending of the two character line portions, and switch the small-diameter roller 140 to the large-diameter roller 130 again. 180, the large-diameter roller 130 waiting next to it is gripped again, and the entire circumference excluding the character line portion is fully bent to perform roll hemming. However, in the roll hemming process according to the present invention, it is sufficient to use only the large-diameter portion and the small-diameter portion of the roller without having to wait or change the roller.

That is, the roller 12 supported by the roller support 120 attached to the tip of the robot arm 111
As shown in FIG. 3, the large-diameter portion 13 of the outer panel of the material to be hemmed W rolls on the guide surface 51 of the lower die 50.
The robot arm 111 is moved so that the entire circumference of Po is preliminarily bent. Then, the outer peripheral flange Pf of the outer panel Po
Is pressed obliquely on the extension of the guide surface 51 by the large-diameter portion 13 of the roller 12 to be preliminarily bent. In this case, the same preliminary bending is performed even in the character line portion 200.

When preliminary bending of the entire circumference is completed by the large-diameter portion 13 of the roller 12, the robot 110 causes the robot arm 111 to move the robot arm 111 from the lower general portion 220 to the character line portion 200 by pre-teaching.
The roller 12 is erected with the small-diameter portion 14 of the roller 12 abutting on the guide surface 51 and the preliminarily bent outer peripheral flange Pf at this position, and as shown by the arrow in FIG. Is moved along the character line portion 200, and the outer peripheral flange Pf of the character line portion 200 is fully bent. This one character line section 20
When the main bending of the character line 200 is completed, the robot 110 moves the robot arm 111 from the lower general surface 220 to the other continuous character line portion 200, and similarly, the small diameter portion 14 of the roller 12 causes the outer peripheral flange Pf of the character line portion 200 to move. Bend this.

When preliminary bending of the entire outer peripheral flange Pf by the large-diameter portion 13 of the roller 12 and full-bending of the outer peripheral flange Pf of the front and rear character lines 200 by the small-diameter portion 14 are completed, the robot 110 teaches in advance.
The robot 110 moves the robot arm 111 to the vicinity of one of the front and rear character line portions 200 and, from that position, causes the large-diameter portion 13 of the roller 12 to abut on the already bent outer peripheral flange Pf in an upright manner, For example, the outer peripheral flange Pf is fully bent by being pressed and moved on the upper general portion 210. The roller 12 is connected to the other character line section 200
The robot arm 111 once separates the roller 12 from the material W to be hemmed, and
At the starting point of the lower general portion 220 exceeding 00, the outer general flange Pf of the material to be hemmed W is again contacted and pressed, and the main bending is performed to the vicinity of the character line portion 200 on the opposite side. As described above, the roll hemming process on the entire circumference of the hemmed material is completed.

As described above, the roll hemming method according to the present embodiment employs the robot arm 1 of the robot 110.
The roller 12 supported by the roller supporting portion 120 attached to the tip of the roller 11 is composed of a two-stage roller composed of a large-diameter portion 13 and a small-diameter portion 14. The large diameter portion 13 is applied, and it is not necessary to switch to the small diameter roller at the time of the main bending of the character line portion 200, and the small diameter portion 14 of the roller 12 is simply applied,
Thereafter, in the final bending of the upper and lower general portions 210 and 220, the large-diameter portion 13 is applied and the outer peripheral flange Pf of the outer panel Po is bent toward the inner panel Pi, so that no loss time is required for switching rollers, and an efficient roll is obtained. Hemming processing is now possible.

Further, the roll hemming device 10 according to the present embodiment has a guide surface 51 with which the small diameter portion 14 of the roller 12 abuts at the start of the main bending of the outer peripheral flange Pf in the character line portion 200, and the guide surface 51. Since the lower die 50 is provided with a concave portion 52 for allowing the large diameter portion 13 of the roller 12 to escape at a substantially right angle, when the small diameter portion 14 of the roller 12 comes into contact with the guide surface 51 and is inclined, the large diameter portion 13 is lowered. 50 can be prevented.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. For example, in the above embodiment,
Although the roller 12 is shown by integrating the large-diameter portion 13 and the small-diameter portion 14, the present invention is not limited to this, and the large-diameter portion 13 and the small-diameter portion 1
4 can be separately supported on the same axis. Further, although the concave portion 52 provided in the lower die 50 is provided in the vicinity of the character line portion, the concave portion 52 may be provided on the entire lower periphery of the guide surface 51.

[0030]

According to the present invention, an inner panel is placed on an outer panel having a character line portion in the middle and having an outer flange raised, and the outer flange of the outer panel is bent toward the inner panel by a roller. In a roll hemming method for integrating an outer panel and an inner panel, the roller is constituted by a two-stage roller having a large-diameter portion and a small-diameter portion, and the outer flange of the outer panel is preliminarily bent at the large-diameter portion of the roller. Since the general portion having a large radius of curvature excluding the character line portion is fully bent at the large diameter portion of the roller, the character line portion having a small radius of curvature is fully bent at the small diameter portion of the roller. This eliminates the need for replacement work, and enables efficient roll hemming by eliminating lost time. It has become possible. Further, a portion corresponding to the character line portion of the lower die is provided with a concave portion for avoiding interference with the large diameter portion of the roller when the character line portion is fully bent at the small diameter portion of the roller. Therefore, when the character line portion is fully bent at the small diameter portion of the roller, interference between the large diameter portion of the roller and the lower mold is prevented,
The movement of the roller can be allowed, and the switching from the large diameter portion to the small diameter portion of the roller can be performed smoothly without any obstacle.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a use state of a roll hemming device according to one embodiment of the present invention.

FIG. 2 is a side cross-sectional view of the roller according to an embodiment of the present invention immediately before shifting to the main bending by the small diameter portion.

FIG. 3 is a side sectional view of the same roller at the time of preliminary bending by a large diameter portion.

FIG. 4 is a partial perspective view of the character line portion when the roller is fully bent by the small diameter portion of the roller according to one embodiment of the present invention.

FIG. 5 is an overall side view of a conventional roll hemming device.

FIG. 6 is a side sectional view at the time of preliminary bending by a conventional large-diameter roller.

FIG. 7 is a side sectional view of a conventional large-diameter roller at the time of main bending.

FIG. 8 is a side sectional view of a conventional small-diameter roller at the time of final bending.

FIG. 9 is a perspective view of a door panel as an example of a material to be hemmed.

FIG. 10 is a sectional view of a character line portion.

[Explanation of symbols]

 10, 100 Roll hemming device 12 Roller 13 Large diameter part 14 Small diameter part 50, 150 Lower die 51, 151 Guide surface 52 Depression 120 Roller support part 124 Support shaft 130 Large diameter roller 140 Small diameter roller 200 Character line part

Claims (2)

[Claims] An inner panel is mounted on an outer panel having a character line portion in the middle and having an outer peripheral flange raised, and the outer peripheral flange of the outer panel is bent toward the inner panel by a roller to form an outer panel and an inner panel. In the roll hemming method, the roller is composed of a two-stage roller having a large-diameter portion and a small-diameter portion, and the outer flange of the outer panel is preliminarily bent at the large-diameter portion of the roller, and then the character line is formed. A roll hemming method, wherein a general portion having a large radius of curvature excluding a portion is fully bent at a large diameter portion of the roller, while the character line portion having a small radius of curvature is fully bent at a small diameter portion of the roller. 2. An outer panel having a character line portion in the middle and having an outer peripheral flange standing upright is mounted on the outer panel, and the outer peripheral flange of the outer panel is fixed to the inner panel by a roller guided by a guide surface provided on a lower die. In a roll hemming device for preliminarily bending an outer peripheral flange of the outer panel with an outer panel and an inner panel by integrating the outer panel and the inner panel by bending the outer peripheral flange by the roller, A two-stage roller having a large-diameter portion for fully bending the general portion excluding the portion and a small-diameter portion for fully bending the character line portion, and a portion corresponding to the character line portion of the lower die, A concave portion that avoids interference with the large-diameter portion of the roller when the character line portion is fully bent at the small-diameter portion of the roller Roll hemming apparatus which is characterized by providing.