JP2013188770A - Apparatus and method for roller hemming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for roller hemming which can reduce the number of times of folding while folding a flange into a predetermined shape by reliably setting a predetermined folding part as a bending point.SOLUTION: A roller hemming apparatus includes a processing roller 10 for folding a flange WF of an outer panel W1 at a predetermined folding part FO by a predetermined folding angle θ1. In the processing roller 10, a round-shape part 12 for sliding a flange end FS in an inside direction of a workpiece W on a processing surface of the processing roller 10 is provided at the processing surface at which the processing roller 10 provides folding processing.

Description

  The present invention relates to a roller hemming device and a roller hemming method. More specifically, the present invention relates to a roller hemming device and a roller hemming method for hemming a flange at a peripheral portion of a workpiece.

  2. Description of the Related Art Conventionally, there is known a roller hemming device that uses a vehicle door panel, side panel, bonnet, or the like as a work and hemmes a flange at a work peripheral edge.

  In the roller hemming device, a processing roller is provided on a robot arm, and the arm is moved in a three-dimensional direction to move the processing roller along the flange of the workpiece placed on the molding surface, thereby performing hemming processing. I do.

  When hemming a workpiece flange with a roller hemming device, it is first necessary to obtain a trajectory along which the processing roller moves by teaching (copying operation). Then, the obtained trajectory information is stored in the control unit of the robot, and hemming is actually performed in the obtained trajectory.

Here, the teaching roller has an outer diameter that is slightly larger than the outer diameter of the processing roller that is actually used, and an enlarged inclined surface in which the one-side inclined surface is enlarged and inclined at a predetermined angle corresponding to a bending angle with respect to the horizontal plane. A roller hemming method is known in which teaching is carried out by attaching the enlarged inclined surface to the molding surface by attaching the head to the tip of a robot arm (see, for example, Patent Document 1).
In the technique of Patent Literature 1, when teaching is actually performed after teaching, a processing roller is attached to the tip of a robot arm, and hemming is performed by moving the processing roller in a track based on teaching. Do.

JP 2002-2367576 A

In the roller hemming apparatus as described above, the workpiece flange is pressed by the processing surface on which the processing roller is bent, and the processing roller is moved along the set bending portion in this state to perform bending.
However, if the bending is not successful, portions other than the bent portion where the flange is set are also bent, and eventually the phenomenon that the flange is bent in the direction opposite to the bending direction (the broken line portion shown in FIG. 10) is often experienced.

In order to avoid this phenomenon and bend the flange into a set shape, it is necessary to reduce the bending angle of the flange once by the processing roller and gradually bend the flange.
However, in that case, the number of bendings increases, leading to an increase in processing time and processing cost.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a roller hemming device and a roller hemming method that reduce the number of times of folding while reliably folding the set bent portion into a shape with a flange set as a bending point. There is to do.

  (1) Rollers (for example, processing rollers 10, 14, and 22 described later) that bend a flange (for example, a flange WF described later) of a work (for example, an outer panel W1 described later) at a set bending portion and a bending angle. The roller has an R-shaped portion (for example, described later) for sliding the front end of the flange (for example, a flange front end FS, which will be described later) on the processing surface of the roller in the inner direction of the workpiece on the processed surface. A roller hemming device (for example, a roller hemming device 1 to be described later).

Here, the front end of the flange that contacts the processing surface of the roller includes not only the end surface at the front end portion of the flange but also the portion of the surface near the front end portion of the flange that contacts the processing surface of the roller.
Moreover, the inner side direction of a workpiece | work means the direction which faces the inner side (center part side) of the peripheral part from the peripheral part of a workpiece | work in which the flange was formed.
Further, the R-shaped portion has a curve that protrudes outward on a roller cut surface that passes through the rotation axis of the roller.
According to the invention of (1), the R-shaped portion for sliding the tip of the flange toward the inside of the workpiece on the processing surface is provided on the processing surface of the roller, and the friction between the tip of the flange and the processing surface is reduced. . For this reason, when the front-end | tip of a flange and a process surface contact | abut, the front-end | tip of a flange can be slid to the inner side direction of a workpiece | work on a process surface. Therefore, since the flange tip does not hit the machining surface, the flange does not bend between the flange tip and the set bending part, and the flange is surely shaped with the set bending part as the bending point. Can be folded.
Further, since the flange does not bend between the front end of the flange and the set bent portion, the bending angle of the flange for each bending process can be increased, and the number of times of bending the flange can be reduced.
Therefore, it is possible to reduce the number of bendings while reliably bending the flanges to the shape in which the flange is set with the set bent part as a bending point. Thereby, reduction of a processing man-hour, shortening of processing time, and reduction of processing cost can be aimed at.

  (2) Rollers (for example, processing rollers 10, 14, and 22 described later) for bending a workpiece (for example, an outer panel W1 described later) of a flange (for example, a flange WF described later) at a set bending portion and a bending angle. However, an R-shaped part (for example, an R-shaped part 12 described later) for sliding the tip of the flange (for example, a flange front-end FS described later) on the processed surface inward of the workpiece on the processed surface of the roller , 19, 29) to reduce friction between the front end of the flange and the processing surface, and when the front end of the flange contacts the processing surface, the front end of the flange is placed on the processing surface on the workpiece. A roller hemming method characterized by sliding inwardly.

  According to the invention of (2), the same operation and effect as the invention of (1) can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the roller hemming apparatus and roller hemming method which reduce the frequency | count of bending can be provided, bend | folding reliably in the shape which set the flange by setting the bending part as a bending point.

It is a figure which shows schematic structure of the roller hemming apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the mode of the processing roller at the time of the pre-bending based on the said 1st Embodiment. It is a figure which shows the mode of the processing roller at the time of the main bending which concerns on the said 1st Embodiment. It is a figure which shows the mode of the processing roller at the time of the preliminary bending which concerns on the comparative example 1. FIG. It is a figure which shows the mode of the processing roller at the time of the preliminary bending which concerns on 2nd Embodiment of this invention. It is a figure which shows the mode of the processing roller at the time of the main bending which concerns on the said 2nd Embodiment. It is a figure which shows the mode of the processing roller at the time of the preliminary bending which concerns on the comparative example 2. FIG. It is a figure which shows the mode of the processing roller at the time of the preliminary bending which concerns on 3rd Embodiment of this invention. It is a figure which shows the mode of the processing roller at the time of the preliminary bending which concerns on the comparative example 3. FIG. It is a figure which shows a mode that the phenomenon in which the flange of a prior art bent in the direction opposite to a bending direction produced.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram illustrating a schematic configuration of a roller hemming device 1 to which a roller hemming device and a roller hemming method according to the present embodiment are applied.
The roller hemming device 1 includes a processing table 30, a processing roller 10, and a robot 40.

The processing table 30 includes a support base 31 installed on the floor surface and a table unit 32 supported by the support base 31.
A work W is placed on the table portion 32.
The workpiece W is, for example, an automobile door panel or the like, and includes an outer panel W1 and an inner panel W2. In the outer panel W1, the flange WF is bent at approximately 90 ° at the remaining peripheral edge with respect to the portion (main body) where the inner panel W2 is arranged at the center.
The outer panel W <b> 1 is placed on the table portion 32 in a state where the flange WF stands upright perpendicular to the surface of the table portion 32. On the outer panel W1, the inner panel W2 is disposed so that the flange WF of the outer panel W1 wraps the end portion of the inner panel W2.
An adhesive is applied between the outer panel W1 main body and the end of the inner panel W2 and on the folded surface of the flange WF. The adhesive contains a solid material such as glass beads.

The processing roller 10 performs bending processing (roller hemming processing) on the flange WF of the outer panel W <b> 1 placed on the table portion 32.
The processing roller 10 is supported by an arm 42 of the robot 40 so as to be movable in a three-dimensional direction, and is rotatable with respect to the arm 42.
The roller hemming process is usually performed by using the processing roller 10 to perform at least one preliminary bending in which the flange WF is bent halfway in the final bent shape and the main bending in which the flange WF is bent to the final bent shape. Done.

The robot 40 includes a base 41 fixed to the floor surface and an arm 42 that supports the processing roller 10 so as to be movable in a three-dimensional direction, and moves the processing roller 10 based on pre-stored teaching. Is.
The robot 40 is configured such that the processing roller 10 moves to a predetermined trajectory set in advance by teaching in preliminary bending and main bending.

FIG. 2 is a diagram illustrating a state of the processing roller 10 during preliminary bending according to the present embodiment. FIG. 3 is a diagram illustrating a state of the processing roller 10 during the main bending according to the present embodiment.
As shown in FIGS. 2 and 3, the processing roller 10 has a substantially cylindrical shape that can rotate around the rotation axis C <b> 1, and the processing surface includes a circumferential shape portion 11 and an R shape portion 12. A boundary portion 13 is formed between the circumferential shape portion 11 and the R shape portion 12.
The circumferential shape portion 11 is provided on the support side of the arm 42 of the robot 40 in the processing roller 10, and the R shape portion 12 is a tip that is opposite to the support side of the arm 42 of the robot 40 in the processing roller 10. Provided on the side.
The R-shaped portion 12 is formed to have a curved surface in which the front end side of the processing roller 10 is convex outward on a cut surface passing through the rotation axis C1.

The processing roller 10 and the robot 40 that moves the processing roller 10 are configured to perform the following preliminary bending.
In the pre-bending, first, as shown in FIG. 2, for example, from the state where the workpiece W is placed on the roller hemming device 1, that is, the state WF0 where the flange WF is bent at approximately 90 °, the rotation shaft of the processing roller 10 is rotated. C1 is inclined to an angle at which the bending angle θ1 can be bent with respect to the flange WF ((90 ° −θ1) with respect to the surface of the table portion 32). Then, the processing roller 10 maintaining the angle of the inclined rotation axis C1 is brought into contact with the flange WF in the state WF0, and the flange WF is further pressed.
At this time, the flange WF is bent at a bending angle θ1 immediately below the processing roller 10, but is in the state WF0 in the unprocessed portion of the processing roller 10, and the processing roller 10 from the unprocessed portion to the processing roller 10 is between them. It is continuously deformed from the state WF0 to the bent state at the bending angle θ1 toward the bottom.
Next, the processing roller 10 is moved along the bent portion FO while maintaining the angle of the rotation axis C1 of the processing roller 10, and the flange WF is bent into a set shape.
Note that θ1 may be 45 °, for example.
Here, the preliminary bending is not limited to one time, and may be performed a plurality of times according to the bending angle at which the flange WF is bent.

The processing roller 10 and the robot 40 for moving the processing roller 10 are configured to perform the following main bending after the preliminary bending is completed.
In the main bending, as shown in FIG. 3, first, the rotation axis C1 is tilted to an angle at which the bending angle θ2 can be bent in the main bending (for example, a state parallel to the surface of the table portion 32). Then, the flange WF is similarly pressed by the processing roller 10 maintaining the angle of the inclined rotation axis C1, and the processing roller 10 is similarly moved along the bent portion FO, so that the flange WF is completely formed as a final shape. Wrap around.
In this bending, the flange WF is bent until it contacts the end of the inner panel W2, and the end of the inner panel W2 is sandwiched between the flange WF and the outer panel W1 main body. At this time, the solid material contained in the adhesive bites between the outer panel W1 and the inner panel W2, and strongly bonds the outer panel W1 and the inner panel W2.

Next, a roller hemming method using the roller hemming device 1 according to this embodiment will be described.
First, the outer panel W <b> 1 is placed on the surface of the table portion 32. At this time, the outer panel W1 is in a state where the flange WF is bent upward by approximately 90 °.

  Next, the inner panel W2 is overlaid on the central portion (main body) of the outer panel W1. The end of the inner panel W2 is housed inside the flange WF of the outer panel W1 body. At this time, an adhesive is applied between the outer panel W1 main body and the end of the inner panel W2 or on the folded surface of the flange WF.

Next, the robot 40 performs preliminary bending according to the teaching trajectory stored in advance.
That is, as shown in FIG. 2, the rotation axis C1 is inclined at a predetermined angle (90 ° −θ1) with respect to the surface of the table portion 32.
Then, the flange WF is pressed by the processing roller 10 while maintaining the tilted rotation axis C1. The processing roller 10 is pressed against the flange WF by moving the processing roller 10 with respect to the flange WF in parallel with the surface of the table portion 32 or by moving the processing roller 10 perpendicularly to the surface of the table portion 32. Alternatively, the movement may be performed in a direction perpendicular to the rotation axis C1.
Next, the processing roller 10 is moved along the bending portion FO while maintaining the angle of the rotation axis C1 of the processing roller 10, and the flange WF is bent from the state WF0. At this time, the processing roller 10 rotates on the flange WF along with the movement along the bent portion FO.
By this preliminary bending, the flange WF is bent at the set bending portion FO and the bending angle θ1.

The preliminary bending may be performed a plurality of times until the bending angle of the flange WF becomes a state where the main bending can be performed next time. For example, the bending angle in each pre-bending is set to 30 °, and the bending is performed until the bending angle of the flange WF can be fully bent (the bending angle is 60 °). May be performed twice.
That is, when the preliminary bending is performed a plurality of times, the rotation axis C1 is tilted to an angle that makes it closer to parallel with the surface of the table portion 32 from the previous preliminary bending state. Then, the flange WF is pressed by the processing roller 10 while maintaining the tilted rotation axis C1.
Next, the processing roller 10 is moved along the bent portion FO while maintaining the angle of the rotation axis C1 of the processing roller 10, and the flange WF is bent. At this time, the processing roller 10 rotates on the flange WF along with the movement along the bent portion FO.
As a result, the flange WF is bent at the set bent portion and bending angle.

Next, the robot 40 performs the main bending according to the teaching trajectory stored in advance.
That is, as shown in FIG. 3, the rotation axis C1 is tilted from a state where the preliminary bending is completed to an angle at which the bending angle θ2 can be bent (that is, a state parallel to the surface of the table portion 32). Then, the flange WF is pressed by the processing roller 10 while maintaining the tilted rotation axis C1.
Next, the flange WF is pressed in a state in which the angle of the rotation axis C1 of the processing roller 10 is maintained, and the processing roller 10 is moved along the bent portion FO in this state to bend the flange WF. At this time, the processing roller 10 rotates on the flange WF along with the movement along the bent portion FO.
As a result, the flange WF is bent at the set bending portion FO and the bending angle θ2.

By this bending, the end of the inner panel W2 is sandwiched between the flange WF and the outer panel W1 body by bending until the flange WF contacts the end of the inner panel W2.
At this time, the outer panel W1 and the inner panel W2 are strongly coupled by the solid material contained in the adhesive biting between the outer panel W1 and the inner panel W2.

Next, specific features of the bending process such as preliminary bending will be described.
As shown in FIG. 2, in the pre-bending, the processing roller 10 acts to push and bend the flange WF with the processing roller 10 in order to change the flange WF from the state WF0 to the bent state θ1. At this time, the flange WF is continuously deformed from the state WF0 to the bent state at the bending angle θ1 by being dragged by the portion where the unprocessed portion of the processing roller 10 is bent first. At this time, in order to bend the flange WF, as shown in FIG. 2, the flange tip FS in the state WF0 is projected onto the rotation axis C1 of the processing roller 10 (that is, rotated on the processing surface of the processing roller 10). It is necessary to move the movement amount L1 (in the direction of the axis C1).
Part of the movement L1 of the flange tip FS needs to be performed while the flange tip FS is in contact with the processing surface of the processing roller 10.
Here, as described above, the flange front end FS that contacts the processing surface of the processing roller 10 is not only the end surface at the front end of the flange WF, but also the vicinity of the front end of the flange WF that contacts the processing surface of the processing roller 10. The part of the surface is also included.
In order for the flange tip FS to perform a part of the movement of the movement amount L1 while the flange tip FS is in contact with the processing surface of the processing roller 10, the flange tip FS of the outer panel W1 is placed on the processing roller 10. It is necessary to slide in the inner direction of the workpiece W on the processing surface.
In addition, the inner side direction of the workpiece | work W means the direction which faces the inner side (center part side) of the peripheral part from the peripheral part of the workpiece | work in which the flange WF was formed.
Here, since the flange WF is bent by approximately 90 ° with respect to the outer panel W1 main body, especially in the first time of the pre-bending, the flange tip FS is positioned on the processing roller 10 when the bending angle is large. In some cases, it is difficult to slide inward of the workpiece W on the processing surface.
When the flange tip FS is difficult to slide inward of the workpiece W on the processing surface of the processing roller 10, the portion other than the bent portion FO of the flange WF is also bent, and finally the flange WF is in the direction opposite to the bending direction. There is a possibility that a phenomenon of bending (see FIG. 4) occurs.

In order to avoid this phenomenon and bend the flange WF into a set shape, as described above, it is necessary to reduce the bending angle of the flange WF once by the processing roller 10 and gradually bend the flange WF. there were.
However, in that case, the number of bendings increases, leading to an increase in processing time and processing cost.

On the other hand, in the roller hemming device 1 according to the present embodiment, the R-shaped portion 12 is provided on the processing surface front end side of the processing roller 10.
When the R-shaped portion 12 is provided on the processing surface front end side of the processing roller 10, the friction between the flange front end FS and the processing surface is reduced. For this reason, when the flange front end FS and the processing surface come into contact with each other, the flange front end FS can slide on the processing surface of the processing roller 10 toward the inside of the workpiece W.
That is, the R-shaped portion 12 provided on the processing surface of the processing roller 10 is formed in a region (the processing surface front end side of the processing roller 10) where the flange front end FS contacts the processing surface during bending. . Therefore, when the flange tip FS and the processing surface of the processing roller 10 come into contact with each other and the flange tip FS moves in a region where the processing surface of the processing roller 10 contacts (that is, the movement amount L1 of the flange tip FS). ), The flange tip FS can be slid toward the inside of the workpiece W on the processing surface of the processing roller 10.

Therefore, the flange tip FS does not hit the processing surface of the processing roller 10, and the flange WF is not bent between the flange tip FS and the set bent portion FO. Thereby, the flange front end FS is drawn toward the base side of the flange WF, and the phenomenon that the flange WF is bent in the direction opposite to the bending direction does not occur.
As described above, a part of the movement of the movement amount L1 of the flange tip FS required while the flange tip FS is in contact with the processing surface of the processing roller 10 by prebending can be secured and set. The bent portion FO can be used as a bending point, and the flange WF can be maintained in a flat state and can be reliably bent at a set bending angle.

FIG. 4 is a view showing a state of the processing roller 110 at the time of preliminary bending according to the first comparative example. The processing roller 110 shown in FIG. 4 does not have an R-shaped portion on the processing surface.
In the case of this comparative example 1, there often occurs a phenomenon that the bent portion FO with the flange WF set cannot be bent into a state WFC bent at a bending angle set with a bending point.
That is, if the processing roller 110 does not have an R-shaped portion on the processing surface, the flange tip FS does not slide on the processing surface of the processing roller 110, so the flange tip FS hits the processing surface of the processing roller 110. The portions other than the bent portion FO may be bent due to friction between the flange tip FS and the processing surface of the processing roller 110.
Finally, as shown in FIG. 4, the flange tip FS is drawn toward the base side of the flange WF, and the flange WF passes from the state WF0 to the state WF1 and the state WF2, and the flange WF of the state WF3 is in the direction opposite to the bending direction. A bending phenomenon occurs.
On the other hand, the above phenomenon does not occur in the roller hemming device 1 according to the present embodiment.

The roller hemming device 1 according to the present embodiment described above has the following effects.
(1) An R-shaped portion 12 for sliding the flange tip FS in the inner direction of the workpiece W on the processing surface of the processing roller 10 is provided on the processing surface tip side of the processing roller 10. Friction with the machined surface of the roller 10 is reduced. For this reason, when the flange front end FS and the processing surface of the processing roller 10 come into contact, the flange front end FS can be slid on the processing surface of the processing roller 10 toward the inside of the workpiece W. Accordingly, since the flange tip FS does not hit the processing surface of the processing roller 10, the flange WF is not bent between the flange tip FS and the bent portion FO, and the flange WF is set with the bent portion FO as a bending point. Can be reliably bent into shape. For this reason, the phenomenon that the flange WF bends in the direction opposite to the bending direction does not occur.
In addition, since the flange WF is not bent between the flange tip FS and the bent portion FO, the bending angle of the flange WF for each bending process can be increased, and the number of bendings for gradually bending the flange WF can be reduced. .
Therefore, it is possible to reduce the number of bendings while reliably bending the flange WF into a shape in which the set bending portion FO is the bending point. Thereby, reduction of a processing man-hour, shortening of processing time, and reduction of processing cost can be aimed at.

Second Embodiment
In the present embodiment, the shape of the processing roller 14 is different from that of the first embodiment, but the other parts are the same. Therefore, the characteristic part will be described, and the description of the same configuration will be omitted.

FIG. 5 is a view showing a state of the processing roller 14 during preliminary bending according to the present embodiment. FIG. 6 is a diagram illustrating a state of the processing roller 14 during the main bending according to the present embodiment.
As shown in FIGS. 5 and 6, the processing roller 14 has a substantially cylindrical shape having a conical portion 17 at the tip of the cylindrical portion 15 that can rotate around the rotation axis C <b> 2.
The processed surface of the cylindrical portion 15 is formed in the circumferential shape portion 16. The processing surface of the conical part 17 includes a tapered part 18 connected to the circumferential part 16, an R-shaped part 19 provided on the tip side opposite to the cylindrical part 15 side with respect to the tapered part 18, and Have A boundary portion 20 is formed between the circumferential shape portion 16 and the taper shape portion 18, and a boundary portion 21 is formed between the taper shape portion 18 and the R shape portion 19.
The R-shaped portion 19 is formed by rounding the corner at the tip end from the boundary portion 21 of the processing surface of the conical portion 17 of the processing roller 14. The R-shaped portion 19 is formed to have a curved surface in which the processing surface tip side of the conical portion 17 of the processing roller 14 is convex outward on a cut surface passing through the rotation axis C2.

The processing roller 14 and the robot 40 that moves the processing roller 14 are configured to perform preliminary bending as described below.
In the pre-bending, first, as shown in FIG. 5, for example, from the state where the workpiece W is placed on the roller hemming device 1, that is, the state WF0 where the flange WF is bent at approximately 90 °, the rotation shaft of the processing roller 14 is rotated. C2 moves the processing roller 14 close to the flange WF while maintaining the horizontal direction, and presses the flange WF by bringing only the conical portion 17 into contact with the flange WF. Next, in this state, the processing roller 14 is moved along the bent portion FO, and the flange WF is bent at a bending angle θ3 (for example, 45 ° in the direction of folding back).

The processing roller 14 and the robot 40 that moves the processing roller 14 are configured to perform the following main bending after the preliminary bending is completed.
In the main bending, from the state in which the flange WF is bent at the bending angle θ3 by the preliminary bending, first, as shown in FIG. 6, the processing roller 14 is brought close to the flange WF while maintaining the rotation axis C2 in the horizontal direction. Only the cylindrical portion 15 is brought into contact with the flange WF to press the flange WF. Next, in this state, the processing roller 14 is moved along the bending portion FO, and the flange WF is bent at a bending angle θ4, that is, completely folded back as a final shape.

Next, specific features of the pre-bending bending process will be described.
In the roller hemming device 1 according to this embodiment, an R-shaped portion 19 is provided on the processing surface front end side of the conical portion 17 of the processing roller 14.
When the R-shaped portion 19 is provided on the processing surface front end side of the conical portion 17 of the processing roller 14, the friction between the flange front end FS and the processing surface of the conical portion 17 is reduced. For this reason, when the flange tip FS and the machining surface of the conical portion 17 abut, the flange tip FS can be slid on the machining surface of the conical portion 17 toward the inside of the workpiece W.
That is, the R-shaped portion 19 provided on the processing surface of the conical portion 17 is formed in a region where the flange tip FS abuts on the processing surface during bending (the processing surface front end side of the conical portion 17 of the processing roller 14). Has been. Therefore, when the flange tip FS and the machining surface of the conical portion 17 come into contact with each other and the flange tip FS moves in a region where the machining surface of the conical portion 17 comes into contact (that is, the movement amount L2 of the flange tip FS moves). The flange tip FS can be slid on the processing surface of the conical portion 17.

Therefore, the flange front end FS does not hit the processing surface of the conical portion 17 of the processing roller 14, and the flange WF is not bent between the flange front end FS and the set bent portion FO. Thereby, the flange front end FS is drawn toward the base side of the flange WF, and the phenomenon that the flange WF is bent in the direction opposite to the bending direction does not occur.
In this way, it is possible to ensure a part of the movement of the movement amount L2 of the flange tip FS required while the flange tip FS is in contact with the processing surface of the conical portion 17 of the processing roller 14 by preliminary bending. The flange WF can be maintained in a flat state with the set bent portion FO as a bending point, and can be reliably bent at a set bending angle.

FIG. 7 is a diagram illustrating a state of the processing roller 114 during preliminary bending according to the second comparative example. The processing roller 114 shown in FIG. 7 does not have an R-shaped portion on the processing surface tip side of the conical portion.
In the case of this comparative example 2, there is often a phenomenon in which the bent portion FO with the flange WF set cannot be bent into a state WFC bent at a bending angle set with a bending point.
That is, if the processing roller 114 does not have an R-shaped portion on the processing surface, the flange tip FS does not slide on the processing surface of the processing roller 114, so the flange tip FS hits the processing surface of the processing roller 114. The portions other than the bent portion FO may be bent due to friction between the flange tip FS and the processed surface.
Finally, as shown in FIG. 7, the flange tip FS is drawn toward the base side of the flange WF, and the flange WF passes from the state WF0 to the state WF1, the state WF2, and the flange WF of the state WF3 is in the direction opposite to the bending direction. A bending phenomenon occurs.
On the other hand, the above phenomenon does not occur in the roller hemming device 1 according to the present embodiment.

  According to the roller hemming device 1 according to the present embodiment described above, the effect (1) similar to that of the first embodiment is achieved.

<Third Embodiment>
In this embodiment, the shape of the processing roller 22 is different from that of the second embodiment, but the other parts are the same. Therefore, the characteristic part will be described, and the description of the same configuration will be omitted.

FIG. 8 is a diagram illustrating a state of the processing roller 22 during preliminary bending according to the present embodiment.
As shown in FIG. 8, the processing roller 22 is rotatable about the rotation axis C <b> 3. It has a substantially cylindrical shape having a conical portion 27.
The processed surface of the cylindrical portion 23 is formed in the circumferential shape portion 24. The processed surface of the first conical portion 25 is formed in the tapered portion 26. The processed surface of the second conical part 27 is formed in a tapered part 28. A processed surface between the first conical portion 25 and the second conical portion 27 is formed in the R-shaped portion 29. A boundary portion is formed between the circumferential shape portion 24 and the tapered shape portion 26, and an R shape portion 29 is formed between the tapered shape portion 26 and the tapered shape portion 28.
The R-shaped portion 29 is formed by rounding the corner of the processing surface at the boundary between the first conical portion 25 and the second conical portion 27 of the processing roller 22. That is, the R-shaped portion 29 is formed to have a curved surface in which the boundary portion between the first conical portion 25 and the second conical portion 27 of the processing roller 22 is convex outward on the cut surface passing through the rotation axis C3. Is done.

The processing roller 22 and the robot 40 that moves the processing roller 22 are configured to perform the first preliminary bending as described below.
In the first preliminary bending, for example, as shown in FIG. 8, for example, from the state in which the workpiece W is placed on the roller hemming device 1, that is, the state WF0 in which the flange WF is bent at approximately 90 °, the processing roller 22 is processed. While the rotating shaft C3 is maintained in the horizontal direction, the processing roller 22 is brought close to the flange WF, and only the second conical portion 27 including the R-shaped portion 29 is brought into contact with the flange WF to press the flange WF. Next, in this state, the processing roller 22 is moved along the bent portion FO, and the flange WF is bent at a bending angle θ5 (for example, 60 ° in the direction of folding back).

The processing roller 22 and the robot 40 that moves the processing roller 22 are configured to perform the second preliminary bending as described below.
In the second pre-bending, first, from the state where the flange WF is bent at the bending angle θ5 in the first pre-bending, the rotating shaft C3 is kept in the horizontal direction, the processing roller 22 is brought close to the flange WF, and the flange WF On the other hand, only the first conical portion 25 including the R-shaped portion 29 is brought into contact with the flange WF. Next, in this state, the processing roller 22 is moved along the bent portion FO, and the flange WF is bent at a set bending angle (for example, 30 ° in the direction of folding back).

The processing roller 22 and the robot 40 that moves the processing roller 22 are configured to perform the following main bending after the second preliminary bending is completed.
In the main bending, from the state in which the flange WF is bent at the bending angle set in the second preliminary bending, first, the processing roller 22 is brought close to the flange WF while maintaining the horizontal direction of the rotary shaft C3, and the flange WF is moved to the flange WF. On the other hand, the flange portion WF is pressed by bringing the cylindrical portion 23 into contact therewith. Next, in this state, the processing roller 22 is moved along the bent portion FO, and the flange WF is bent at a set bending angle, that is, completely folded back as a final shape.

Next, specific features of the first preliminary bending process will be described.
In the roller hemming device 1 according to this embodiment, an R-shaped portion 29 is provided on the processing surface between the first conical portion 25 and the second conical portion 27 of the processing roller 22.
When the R-shaped portion 29 is provided on the processing surface between the first conical portion 25 and the second conical portion 27 of the processing roller 22, the friction between the flange tip FS and the processing surface is reduced. For this reason, when the flange front end FS and the processing surface come into contact with each other, the flange front end FS can slide on the processing surface of the processing roller 22 toward the inner side of the workpiece W.
That is, the R-shaped portion 29 provided on the processing surface of the processing roller 22 has a region (between the first conical portion 25 and the second conical portion 27) where the flange tip FS abuts the processing surface during bending. Processed surface). Therefore, when the flange tip FS and the machining surface come into contact with each other and the flange tip FS moves in the region where the machining surface comes into contact (that is, when a part of the movement amount L3 of the flange tip FS is moved). The flange tip FS can be slid on the processing surface.

Therefore, the flange front end FS hits the processing surface, and the flange WF is not bent between the flange front end FS and the set bent portion FO. Thereby, the flange front end FS is drawn toward the base side of the flange WF, and the phenomenon that the flange WF is bent in the direction opposite to the bending direction does not occur.
In this way, it is possible to ensure a part of the movement of the movement amount L3 of the flange tip FS required while the flange tip FS is in contact with the processing surface of the processing roller 22 in the first preliminary bending, The flange WF can be maintained in a flat state with the set bent portion FO as a bending point, and can be reliably bent at a set bending angle θ5.

Next, specific features of the second preliminary bending process will be described.
When the R-shaped portion 29 is provided on the processing surface between the first conical portion 25 and the second conical portion 27 of the processing roller 22, the friction between the flange tip FS and the processing surface is reduced. For this reason, when the flange front end FS and the processing surface come into contact with each other, the flange front end FS can slide on the processing surface of the processing roller 22 toward the inner side of the workpiece W.
That is, the R-shaped portion 29 provided on the processing surface of the processing roller 22 has a region (between the first conical portion 25 and the second conical portion 27) where the flange tip FS abuts the processing surface during bending. Processed surface). Therefore, when the flange tip FS and the machining surface come into contact with each other and the flange tip FS moves in a region where the machining surface comes into contact (that is, when a part of the movement amount of the flange tip FS is performed). The flange tip FS can be slid on the processing surface.

Therefore, the flange front end FS hits the processing surface, and the flange WF is not bent between the flange front end FS and the set bent portion FO. Thereby, the flange front end FS is drawn toward the base side of the flange WF, and the phenomenon that the flange WF is bent in the direction opposite to the bending direction does not occur.
In this way, part of the movement of the flange tip FS that is required during the second pre-bending is performed while the flange tip FS is in contact with the machining surface of the first conical portion 25 of the processing roller 22. Implementation can be ensured, and the flange WF can be maintained in a flat state with the set bent portion FO as a bending point, and can be reliably bent at a set bending angle.

FIG. 9 is a diagram illustrating a state of the processing roller 122 at the time of preliminary bending according to the third comparative example. The processing roller 122 shown in FIG. 9 does not have an R-shaped portion on the processing surface between the first conical portion 125 and the second conical portion 127.
In the case of this comparative example 3, a phenomenon often occurs in which it is not possible to bend into a state WFC that is bent at a bending angle set with the bent portion FO having the flange WF set as a bending point.
That is, if the processing roller 122 does not have an R-shaped portion on the processing surface, the flange tip FS does not slide on the processing surface of the processing roller 122, so the flange tip FS hits the processing surface of the processing roller 122. The flange WF is bent from the state WF0 to the state WF1 and the state WF2 by the friction between the flange tip FS and the processed surface, and the flange WF in the state WF3 is bent in the direction opposite to the bending direction.
On the other hand, the above phenomenon does not occur in the roller hemming device 1 according to the present embodiment.

  According to the roller hemming device 1 according to the present embodiment described above, the effect (1) similar to that of the first embodiment is achieved.

  In addition, this invention is not limited to the said embodiment, The deformation | transformation in the range which can achieve the objective of this invention, improvement, etc. are included by this invention.

DESCRIPTION OF SYMBOLS 1 ... Roller hemming device 10, 14, 22 ... Processing roller (roller)
12, 19, 29 ... R-shaped part W1 ... Outer panel (workpiece)
WF ... Flange FS ... Flange tip

Claims (2)

It is equipped with a roller that bends the workpiece flange at a set folding part and folding angle,
The roller hemming device, wherein the roller is provided with an R-shaped portion for sliding the tip of the flange toward the inside of the workpiece on the processing surface on a processing surface on which the roller is bent. A roller that bends the flange of the workpiece at a set folding portion and a folding angle, and causes the tip of the flange to slide on the machining surface toward the inner side of the workpiece on the machining surface on which the bending of the roller is performed. An R-shaped portion is provided to reduce friction between the front end of the flange and the processing surface, and when the front end of the flange contacts the processing surface, the front end of the flange is placed on the processing surface inside the workpiece. A roller hemming method characterized by sliding in a direction.

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