JP6986493B2 - Roller hemming processing equipment for vehicle panels and processing methods using this - Google Patents

Description

The present invention relates to a roller hemming processing device for a vehicle panel and a processing method using the same.

Members with gently curved surfaces, such as vehicle door panels and hood panels, are usually composed of a front outer panel and a back inner panel provided to reinforce the outer panel, both of which are of the outer panel. It is joined by a hemming process that bends the flange provided on the peripheral edge.

When joining the outer panel and the inner panel by roller hemming, first, an adhesive is applied to the peripheral edges of both panels, and the work is placed on the hemming die as a temporarily assembled work. At that time, the work is accurately positioned and placed by a plurality of locators arranged around the hemming die. Then, in that state, the flange of the outer panel peripheral edge is bent inward by the roller provided at the tip of the arm of the roller hemming robot, the peripheral edge of the inner panel is wrapped, and both peripheral edges of the outer panel and the inner panel are wrapped. Joining by hemming is completed.

As described above, when the work is placed on the hemming die, the work is positioned by a plurality of locators provided on the peripheral portion of the hemming die and fixed by a clamp. Since the locator is located on the orbit of the moving roller, normally, the locator is temporarily retracted from the orbit of the roller according to the movement of the roller, and after the roller has passed, the locator is returned to the original position repeatedly. Was there.

However, the work of constructing a control program that operates in cooperation with the roller that moves according to the shape of the work and the locator so as not to interfere three-dimensionally and incorporating it into the roller hemming processing device is very complicated. .. Therefore, various proposals of other fixing means instead of fixing the clamp have been made so far.

For example, in Patent Document 1, a plurality of openings in which a plurality of suction tools that come into surface contact are arranged are provided on the lower surface of the work, and the lower surface of the work is suction-fixed by using a rubber vacuum pad as the suction tool, and roller hemming is performed. A method of processing has been proposed. Specifically, as the vacuum pad, a multi-stage bellows type rubber pad having a circular cross-sectional shape is used to suck and fix the lower surface of the work. And this eliminates the need to temporarily release the fixation by the locator.

However, in the proposal of Document 1, since the lower part of the work is fixed by using a multi-stage bellows type rubber pad as a suction tool, the rubber part of the vacuum pad is formed due to the pressing rotation of the roller during the roller hemming process. It is presumed that the work will be deformed and the work will be displaced from the predetermined arrangement position.

Further, Patent Document 2 discloses a roller hemming processing method in which a peripheral edge portion of a work (outer panel of a door panel) is positioned by a plurality of claw portions and further fixed by a clamp or a vacuum cup. However, according to such a configuration in which positioning is performed by a plurality of claws, it is necessary to avoid interference between the claws and the roller at the tip of the robot arm during roller hemming processing, and a control program for avoiding interference is incorporated. It is an essential configuration. Although the shape, size, number, etc. of the vacuum cups are not specified, it is presumed to be a conical cup from the drawings and the like. Therefore, also in the proposal of Patent Document 2, for example, during the hemming process after the claw portion is retracted from the trajectory of the roller, the rubber portion of the vacuum cup may be deformed by the pressing rotation of the roller, and the work may be displaced from the predetermined arrangement position. There is sex.

Further, Patent Document 3 has a configuration in which the inner panel and the outer panel of the work are sucked by the suction force of the suction unit due to the vacuum of the suction unit when the work is hemmed by the hemming robot after the works are aligned by the auxiliary clamping means. It is disclosed, and it is said that this will ensure regulatory power.

However, in the configuration of Patent Document 3, since the pressurizing unit and the auxiliary clamping means are in the orbit of the roller of the hemming robot, it is assumed that the movement of the roller is hindered. Therefore, the same problems as before remain in the countermeasures when the pressurizing unit and the auxiliary clamping means are avoided from the trajectory of the roller.

Further, in the suction unit used in Patent Document 3, a conical vacuum cup having the same structure as the vacuum pad used in Patent Document 1 is shown (FIG. 8), and the pad is deformed during the roller hemming process. Misalignment is expected. Further, a part of the plurality of suction units is provided along the peripheral edge of the regulation pad, whereby the inner panel of the work is vacuum sucked, and the other part is provided inside the die body. As a result, the outer panel is vacuum-adsorbed, and it is expected that the structure of the pressurizing unit will be complicated.

Japanese Unexamined Patent Publication No. 2010-240708 Japanese Patent No. 5288047 Japanese Unexamined Patent Publication No. 2013-86181

As described above, in the work fixing means in the roller hemming processing apparatus proposed so far, although the outer panel is fixed to some extent by suction of the vacuum pad such as the multi-stage bellows type, the pad shrinks under reduced pressure. There is a problem that the deformation is large and the shearing force due to the pressing rotation of the roller causes the work to deviate from a predetermined position, so that accurate roller hemming processing cannot be performed. If the work cannot be fixed in place as described above, defective products may occur, such as some parts of the inner and outer panels that are not hemmed, resulting in significant productivity and quality. There was a problem that the decrease occurred.

In addition, when only the lower surface of the outer panel is fixed by suction, the inner panel is in an incomplete state in which a viscous adhesive is applied to the peripheral edges of the outer panel and the inner panel and temporarily assembled. There was a problem that the inner panel was lifted up and the inner panel was also displaced from the predetermined position.

The present invention has been made to solve the above-mentioned problems, and in the manufacture of a vehicle panel, an accurate mounting on a predetermined position on a hemming die in a roller hemming process of a work composed of an outer panel and an inner panel. It is possible to achieve reliable fixing of both panels when placing and moving rollers during hemming, reducing the number of programming steps for automating roller hemming, improving product quality, reducing defect rate and excellent. It is an object of the present invention to provide a roller hemming processing device for a vehicle panel equipped with mass production technology and a processing method using the roller hemming processing apparatus.

The present invention is characterized by the following in order to solve the above problems.
<1> A roller hemming processing device for a vehicle panel for hemming the peripheral edge of the outer panel of a vehicle panel composed of an outer panel and an inner panel with a roller of a roller hemming robot.
A positioning mechanism that positions the outer panel on the hemming die with a locator,
A suction fixing mechanism that sucks and fixes the lower surface of the outer panel with a plurality of vacuum pads,
It is equipped with a locator retracting mechanism that retracts the locator from the trajectory of the roller of the roller hemming robot during roller hemming processing.
The vacuum pad of the suction fixing mechanism has a pad base and a vacuum pad.
A skirt portion that continuously rises from the edge portion of the pad base with a predetermined thickness and has an opening at the end edge portion, and a skirt portion.
A decompression space formed by the inner wall of the pad base and the inner wall of the skirt,
It is provided with a suction through tube that penetrates the pad base portion and communicates with the decompression space portion to suck air in the decompression space portion.
The top view shape of the opening in the skirt portion is oval, and the oblong axis direction is arranged substantially parallel to the direction in which the curvature of the vehicle panel is small. Panel roller hemming processing equipment.
<2> The roller hemming device for a vehicle panel according to <1>, wherein in the vacuum pad, the rising height of the skirt portion from the surface of the pad base is in the range of 3 to 5 mm.
<3> The roller hemming processing device includes a swing arm device having a swing arm capable of rotating, bending, and moving up and down in the upper space of the hemming die.
A pad for fixing the inner panel is provided downward at the tip of the swing arm.
The swing arm is characterized in that the inner panel fixing pad is lowered at a predetermined position and the upper surface of the inner panel is pressed by the inner panel fixing pad to prevent the inner panel from being displaced or lifted. The roller hemming device for a vehicle panel according to <1> or <2>.
<4> The lower surface of the outer panel is suction-fixed by the vacuum pad, the upper surface of the inner panel is pressed by the inner panel fixing pad of the swing arm, and the outer panel and the inner panel are designated on the hemming die. A method for processing a vehicle panel, which comprises performing roller hemming processing while maintaining a state in which the locator of the outer panel is retracted from the track of the roller while being fixed at the position of.

According to the roller hemming processing apparatus for a vehicle panel according to the present invention and the processing method using the same, in the manufacturing of a vehicle panel, a predetermined position on a hemming die in the roller hemming processing of a work composed of an outer panel and an inner panel. It is possible to achieve accurate mounting and secure fixing of both panels when moving the rollers during hemming, reducing the number of programming steps for automating roller hemming, improving product quality, and reducing the defect rate. A roller hemming processing device for a vehicle panel equipped with reduction and excellent mass production technology and a processing method using the same are provided.

It is a schematic sectional drawing which shows one Embodiment of the roller hemming processing apparatus which concerns on this invention. It is a schematic perspective view which shows one Embodiment of the hemming die which concerns on this invention. It is a schematic diagram which shows one Embodiment of the vacuum pad used in this invention, (A) is a top view, (B) is a sectional view.

Hereinafter, the roller hemming processing apparatus for the vehicle panel of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view showing an embodiment of a roller hemming processing apparatus according to the present invention, and FIG. 2 is a schematic perspective view showing an embodiment of a hemming die according to the present invention.

The roller hemming processing device 1 for a vehicle panel of the present invention (hereinafter, also simply referred to as a roller hemming processing device) is a roller hemming robot having a peripheral portion 210 of the outer panel 21 of the vehicle panel 2 composed of an outer panel 21 and an inner panel 22. This is a roller hemming processing device for performing hemming processing with the rollers of.

The roller hemming processing device 1 has a positioning mechanism for positioning the outer panel 21 on the hemming die 10 by a locator 12, a suction fixing mechanism for sucking and fixing the lower surface of the outer panel 21 with a vacuum pad 3, and roller hemming during roller hemming processing. It is provided with a locator retracting mechanism for retracting the locator 12 from the trajectory 11 of the roller of the robot.

The positioning mechanism of the roller hemming processing apparatus 1 of the present invention is a mechanism for positioning when the work 2 composed of the outer panel 21 and the inner panel 22 is placed on the hemming die 10. A plurality of locators 12 that move up and down are provided around the hemming die 10, and the work 2 is placed at an accurate position on the hemming die 10 by the locator 12 in a raised state with respect to the hemming die 10. ..

As described above, the work 2 placed on the hemming die 10 is previously mounted on the peripheral edge portion 220 of the inner panel 22 and the peripheral edge portion 210 of the outer panel 21 having the flange portion 211 having a predetermined size and a predetermined angle on the peripheral edge portion. Adhesive is applied and temporarily assembled. That is, the outer panel 21 and the inner panel 22 are temporarily assembled with the adhesive applied to the peripheral edges 210 and 220, respectively. The adhesive is preferably a highly viscous mixture consisting of either a thermoplastic resin or a thermosetting resin and containing at least one filler selected from inorganic or metal powders and spherical particles.

In the suction mechanism of the present invention, in the positioning mechanism, the lower surface of the outer panel 21 of the work 2 is supported by the vacuum pad 3 in a state where the work 2 is accurately placed at a predetermined position on the hemming die 10, and suction is performed. It is a mechanism to fix. As shown in FIGS. 3A and 3B, the vacuum pad 3 includes at least a pad base portion 30, a skirt portion 31, a decompression space portion 32, and a suction through tube 33. The pad base 30 is a member that fixes and supports the work 2 together with the skirt portion 31 and the suction through pipe 33, and the material is not particularly limited as long as it does not easily deform.

The skirt portion 31 is a member that contacts, attracts, and fixes the lower surface of the outer panel 21 of the work 2, and continuously rises from the edge portion of the pad base portion 30 with a predetermined thickness, and has an opening 34 at the upper end edge portion. is doing. The skirt portion 31 may be integrally molded with the pad base portion 30, or may be separately molded and joined. Further, a decompression space portion 32 is formed in a portion surrounded by the pad base portion 30 and the inner wall of the skirt portion 31.

The material of the skirt portion 31 is not particularly limited as long as it is a material that does not easily deform when the work 2 is adsorbed, but it is preferably a thermoplastic elastomer. Examples of the thermoplastic elastomer include styrene butadiene rubber, butyl rubber, nitrile rubber, ethylene propylene rubber, acrylic rubber, silicone rubber, and fluororubber. Among these, nitrile rubber can be particularly preferably used. The shore hardness of the skirt portion 31 is more preferably 40 to 90 HS, preferably 45 to 85 HS and 60 HS.

The height of the skirt portion 31 rising from the pad base 30 is in the range of 3 to 5 mm, preferably 3.5 to 4.5 mm. If the rising height of the skirt portion 31 is within the above range, the work 2 is not fixed by the locator 12 while the work 2 is sucked, and the work 2 is not displaced even if the roller hemming process is performed. .. The thickness of the skirt portion 31 can be appropriately set according to the hardness of the material and the like, and is not particularly limited, but is usually preferably in the range of 1.5 to 3.5 mm.

Further, the top view shape of the opening 34 is formed in an oval shape, and the oval long axis is preferably in the range of 50 to 125 mm and the short axis is preferably in the range of 15 to 70 mm.

The suction through tube 33 is a member for sucking air in the decompression space 32 to adsorb the work 2, and is provided so as to penetrate the pad base 30 and communicate with the decompression space 32. The material of the suction through tube 33 is not particularly limited as long as it can fix and support the work 2 together with the pad base portion 30 and the skirt portion 31 and is not easily deformed, and is preferably made of metal.

Further, the method of joining the pad base 30 and the suction through tube 33 is not particularly limited as long as they are joined so as not to be easily removed, but for example, as shown in FIG. 3B, the pad base 30 is inserted into the central portion of the pad base 30. A hole is provided, a metal reinforcing member 37 having a female thread formed on the inner surface is fitted in the insertion hole, a male screw is provided at one end of the suction through pipe 33, and a male screw at the tip of the suction through pipe 33 and a metal. It can be joined by screwing it with the female screw of the reinforcing member 37. Further, when the pad base 30 is made of a hard material, a female screw may be formed on the inner surface of the insertion hole provided in the pad base 30 and screwed directly.

Further, in the vacuum pad 3 used in the present invention, it is preferable to form irregularities on the surface portion of the pad base 30 on the decompression space 32 side surface excluding the opening 34 of the suction through pipe 33. By forming irregularities on the surface of the pad base 30 on the decompression space 32 side, the convex portions 35 adhere to the surface of the work 2 when the work 2 is adsorbed, so that the work 2 can be adhered and fixed more stably.

Specifically, the air in the decompression space 32 passes through the gap between the convex portion 35 and the concave portion 36 by suction, is discharged from the suction through pipe 33 provided through the pad base 30, and is discharged from the decompression space 32. The volume decreases. Along with this, the convex portion 35 comes into contact with the lower surface of the outer panel 21 of the work 2. As a result, the vacuum pad 3 is not excessively contracted and deformed, and the occurrence of misalignment of the outer panel 21 due to suction is surely prevented.

When a plurality of convex portions 35 are formed, it is preferable that the surface heights of the convex portions 35 are the same. Further, the height difference between the concave portion 36 and the convex portion 35 is not particularly limited as long as air flows during suction, and the shape and hardness of the convex portion 35 make the air flow of the concave portion 36 during suction. It is not particularly limited as long as the convex portion 35 is not deformed enough to prevent it.

Further, in the suction mechanism of the roller hemming processing apparatus 1 of the present invention, the vacuum pad 3 is arranged inside the peripheral edge of the hemming die 10, and the oval major axis direction of the skirt portion 31 is mounted on the hemming die 10. The vehicle panels 2 to be placed are arranged substantially parallel to each other in the direction in which the curvature is small.

For example, the curvature of the outer panel surface of a vehicle door is usually designed so that the curvature in the front-rear direction is smaller than the curvature in the vertical direction. Therefore, as shown in FIG. 2, by installing all the vacuum pads 3 to be arranged in substantially parallel to the front-rear direction of the door, the work 2 on the hemming die 10 is not displaced. It can be sucked, adhered, and fixed accurately and surely.

Further, the roller hemming processing apparatus 1 of the present invention may be provided with a swing arm apparatus 4 having a swing arm 43 capable of rotating, bending and moving up and down in the upper space of the hemming die 10 as shown in FIG. ..

The swing arm device 4 of the embodiment shown in FIG. 1 is provided with a support column 41 installed outside the hemming die 10 and a support provided at the upper tip portion of the swing arm 43 and the support column 41 to rotatably support the swing arm 43. The part 42 is provided. Further, a pad 44 for fixing the inner panel is provided at the tip of the swing arm 43 in the downward direction. The material of the inner panel fixing pad 44 is not particularly limited as long as it is a solid selected from any one of a metal material, a polymer material, and a rubber material, or a composite material thereof. The shape of the inner panel fixing pad 44 is not particularly limited as long as it can come into contact with the flat surface of the inner panel surface, but a disk shape or a cylindrical shape within a range of 10 to 40 mm in diameter can be used. preferable.

According to the swing arm device 4, the support portion 42 is operated and the swing arm 43 is lowered at a predetermined position on the upper portion of the inner panel 22, so that the upper surface of the inner panel 22 is pressed from above by the inner panel fixing pad 44. This makes it possible to reliably prevent the inner panel 22 from slipping and rising.

A reference pin for the inner panel is further provided at the tip of the swing arm 43 so that the inner panel 22 can be positioned accurately and reliably. Further, by forming the swing arm device 4 in the arch shape shown in FIG. 1, it is possible to avoid it without interfering with the operation of the rollers of the roller hemming robot.

Next, an embodiment of a method for processing a vehicle panel using the roller hemming processing apparatus 1 of the present invention will be described in detail. In the method for processing a vehicle panel of the present embodiment, at least a work positioning step, a work fixing step, a work top surface pressing step, and a hemming processing step are executed.

First, in the work positioning step, the work 2 of the vehicle panel in which the outer panel 21 and the inner panel 22 are temporarily assembled with an adhesive is placed on the hemming die 10 so that the surface side of the outer panel 21 faces down. At this time, the work 2 is accurately positioned by the locator 12 provided around the hemming die 10.

In the next step of fixing the work, the lower surface of the outer panel 21 of the work 2 is suction-fixed by the plurality of vacuum pads 3. Then, in this state, the locator 12 is retracted from the orbit 11 of the roller of the roller hemming robot. In this state, since the outer panel 21 of the work 2 is strongly sucked and fixed by the vacuum pad 3, the position of the work 2 does not shift even if the locator 12 is retracted.

In the next step of pressing the upper surface of the work, the arch-shaped swing arm supported by the support portion 42 by the operation of the support portion 42 provided on the support column 41 of the two swing arm devices 4 installed outside the hemming die 10. The 43 is moved, and the inner panel fixing pad 44 provided at the tip of the swing arm 43 is brought into contact with the upper surface of the inner panel 22. At this time, the inner panel 22 can be accurately and reliably positioned by the reference pin for the inner panel at the tip of the swing arm 43.

According to the upper surface pressing step, since the inner panel fixing pad 44 at the tip of the swing arm 43 is in contact with the inner panel 22 surface substantially vertically, the outer panel 21 and the inner panel 22 are temporarily assembled and incompletely joined. Even in the work 2 in the state, it is possible to reliably prevent the inner panel 22 from slipping and rising.

In the next hemming processing step, the lower surface of the outer panel 21 of the work 2 is suction-fixed by a plurality of vacuum pads 3, the locator 12 is retracted, and the inner panel fixing pad 44 of the swing arm 43 is used as the inner of the work 2. Hemming is performed by the rollers of the roller hemming robot in a state of being in contact with the upper surface of the panel 22. By making the shape of the swing arm device 4 arch-shaped, the roller of the roller hemming robot can perform hemming processing by diving under the arch-shaped swing arm 43 without interfering with each other.

As described above, according to the method for processing a vehicle panel of the present invention, the lower surface side of the outer panel 21 of the work 2 is strongly sucked and fixed by the vacuum pad 3, and the upper surface side of the inner panel 22 is the inner panel of the swing arm 43. Since the fixing pad 44 is pressed from above, the occurrence of displacement and lifting is prevented even when the locator 12 is retracted, and roller hemming processing can be performed at an accurate mounting position.

The roller hemming processing apparatus for a vehicle panel of the present invention and the processing method using the same have been described above based on the embodiments, but the present invention is not limited to the above embodiment and does not deviate from the gist thereof. Various modifications and changes are possible within the range.

For example, in the above embodiment, two swing arm devices 4 are used to press the inner panel 22 from above, but one swing arm device 4 or one is used as long as it does not interfere with the roller trajectory 11 of the roller hemming robot. Two or more may be used.

Hereinafter, the roller hemming processing apparatus for the vehicle panel of the present invention and the processing method using the roller hemming processing apparatus will be specifically described with reference to Examples. However, the present invention is not limited to the following examples.

<Example 1>
Uniform viscosity of 300 Pa · s containing 1% by mass of glass beads with an average particle size of 200 μm on the inner peripheral edge of the outer panel and the peripheral edge of the inner panel provided with a flange of 8 mm in width and 90 ° on the peripheral edge made of hot-dip galvanized steel sheet. A paste-like, solvent-free, one-component thermosetting epoxy resin adhesive was applied, and a workpiece for a vehicle panel temporarily assembled by a robot was prepared. Next, another robot automatically placed the workpiece in a predetermined position on the hemming die according to the program of the roller hemming processing apparatus, and positioned it by the locator.

Inside the hemming die, as shown in FIG. 2, 12 vacuum pads are arranged at predetermined positions so that their major axes are substantially parallel to the front-rear direction of the vehicle, that is, the direction in which the curvature of the curved surface of the outer panel is small. did. The vacuum pad used was an oval, oil-resistant nitrile rubber having a skirt thickness of 3 mm, a major axis length of 94 mm, and a minor axis length of 34 mm, and a shore hardness of 60 HS. When the work was placed on the hemming die, it was confirmed that the upper ends of the skirts of all 12 vacuum pads were in contact with the lower surface of the outer panel.

Next, with the workpiece positioned by the locator, all the vacuum pads were sucked to fix the outer panel, and then the locator used for positioning was automatically retracted from the roller trajectory. At this point, it was confirmed that the position of the peripheral edge of the outer panel coincided with the predetermined arrangement position, and the work as the vehicle panel was placed on the hemming die within the range of assembly accuracy.

Next, using four roller hemming robots whose movements are programmed in advance, prehem processing is performed in which the 90 ° bent flange formed on the peripheral edge of the inner panel of the work is further bent to 145 ° by the rollers of the roller hemming robot. gone.

After the prehem processing was completed, the same work was further subjected to roller hemming processing, which is a programmed 180 ° bending process. As a result, it can be processed without hindering the movement of the rollers, and the position of the peripheral edge of the outer panel of the work is not displaced at all and is consistent with the predetermined arrangement position. confirmed.

<Example 2>
Using the same work and hemming die as in Example 1, the work was suction-fixed on the hemming die under the same conditions.

Next, the inner panel fixing pad provided at the tip of the swing arm was brought into contact with the flat portion of the inner panel surface substantially perpendicularly, and the inner panel was pressed from above to prevent lifting and fixing. At this stage, there was no deviation between the outer panel and the peripheral edge of the inner panel.

At the same time, while the outer panel is sucked and fixed by the vacuum pad, the swing arm provided on each support of the two swing arm devices provided on the outside of the hemming die is automatically extended via the support portion. An arch was formed, and each inner reference pin was brought into contact with the inner panel surface almost vertically to position the inner panel.

That is, at this point, the outer panel side is fixed by the vacuum pad and the inner panel is fixed in a predetermined position by the swing arm in a state where the peripheral edge of the inner panel is temporarily assembled by applying the adhesive to the peripheral edge of the outer panel. rice field.

Next, as in the first embodiment, four roller hemming robots whose movements are programmed in advance are used, and the 90 ° bent flange formed on the peripheral edge of the inner panel of the work is further subjected to the rollers of the roller hemming robot. Prehem processing was performed to bend to 145 °. Further, after pre-hemming, roller hemming of 180 ° bending programmed for the work was performed.

In the roller hemming process, the tip of the roller hemming robot and the roller dive under the swing arm, and the swing arm can heme the entire peripheral edge of the panel without hindering the movement of the roller in the orbit. Further, in the above hemming, there was no problem in the reciprocating movement of the rollers.

That is, it was confirmed that in the method of Example 2, prehem processing can be performed without hindering the movement of the rollers, and the position of the peripheral edge portion of the outer panel coincides with the predetermined arrangement position. In addition, a plurality of points of the peripheral portion (hemming portion) of the vehicle panel after the completion of the hemming process were cut, and the deviation of each peripheral portion of the outer panel and the inner panel from the initial predetermined position was investigated. As a result, it was confirmed that the fixing position of the outer panel with respect to the inner panel of the present invention was not displaced at all.

From these results, it was confirmed that the swing arm device of the present invention is effective in accurate positioning and fixing of the inner panel and precise roller hemming.

<Comparative Example 1>
As a vacuum pad for fixing the outer panel of the work, except that a bellows vacuum pad made of oil-resistant nitrile rubber, with a shore hardness of 60HS, a circular bottom surface, a bottom radius of the rubber part of 50 mm, and a height of 42 mm was used. The outer panel and the inner panel were coated with an adhesive in the same manner as in Example 1, and the work of the temporarily assembled vehicle panel was placed at a predetermined position on the hemming die by a locator.

Next, the bellows vacuum pad was sucked to fix the outer panel. In this state, it was confirmed that the pad was crushed by the decompression and the height of the rubber part was almost halved.

Next, as in the first embodiment, four roller hemming robots whose movements are programmed in advance are used, and the 90 ° bent flange formed on the peripheral edge of the inner panel of the work is further subjected to the rollers of the roller hemming robot. Prehem processing was performed to bend to 145 °. Further, after pre-hemming, roller hemming of 180 ° bending programmed for the work was performed.

At this stage, when the hemming state of the work was visually observed, the work was displaced due to the displacement of the bellows vacuum pad, and the inner panel was inserted between the 180 ° bent outer panels during the final hemming. The part that is not done was confirmed.

In addition, a plurality of peripheral portions (hemming portions) of the vehicle panel after the hemming process were opened, and deviations from the initial predetermined positions of the peripheral portions of the outer panel and the inner panel were investigated. As a result, it was confirmed that a deviation of about 0.5 mm from a predetermined position on each peripheral edge of the outer panel and the inner panel was generated.

As a result, it was confirmed that when the conventional vacuum pad was used, the outer panel was displaced and the inner panel was also displaced.

1 Roller hemming processing equipment 10 Hemming die 11 Roller track 12 Locator 2 Work (vehicle panel)
21 Outer panel 210 Outer panel peripheral edge 211 Flange 22 Inner panel 220 Inner panel peripheral edge 3 Vacuum pad 30 Pad base 31 Skirt 32 Decompression space 33 Suction through tube 34 Opening 35 Convex 36 Concave 37 Metal reinforcement member 4 Swing arm device 41 Support column 42 Support part 43 Swing arm 44 Inner panel fixing pad

Claims (3)

A roller hemming processing device for a vehicle panel for hemming the peripheral edge of the outer panel of a vehicle panel composed of an outer panel and an inner panel with a roller of a roller hemming robot.
A positioning mechanism that positions the outer panel on the hemming die with a locator,
A suction fixing mechanism that sucks and fixes the lower surface of the outer panel with a plurality of vacuum pads,
It is equipped with a locator retracting mechanism that retracts the locator from the trajectory of the roller of the roller hemming robot during roller hemming processing.
The vacuum pad of the suction fixing mechanism has a pad base and a vacuum pad.
A skirt portion that continuously rises from the edge portion of the pad base with a predetermined thickness and has an opening at the end edge portion, and a skirt portion.
A decompression space formed by the inner wall of the pad base and the inner wall of the skirt,
It is provided with a suction through tube that penetrates the pad base portion and communicates with the decompression space portion to suck air in the decompression space portion.
The top view shape of the opening in the skirt portion is oval, and the elliptical long axis direction of the oval is arranged substantially parallel to the direction in which the curvature of the vehicle panel is small .
In the skirt portion, the inner peripheral surface and the outer peripheral surface rise linearly over the entire height direction, and the skirt portion rises linearly.
The rising height of the skirt portion from the surface of the pad base is in the range of 3 to 5 mm.
A roller hemming processing device for a vehicle panel, characterized in that the shore hardness of the skirt portion is 40 to 90 HS. The roller hemming processing apparatus includes a swing arm apparatus having a swing arm capable of rotating, bending and moving up and down in the upper space of the hemming die.
A pad for fixing the inner panel is provided downward at the tip of the swing arm.
The swing arm is characterized in that the inner panel fixing pad is lowered at a predetermined position and the upper surface of the inner panel is pressed by the inner panel fixing pad to prevent the inner panel from being displaced or lifted. The roller hemming device for a vehicle panel according to claim 1. A method of performing roller hemming processing using the roller hemming device of the vehicle panel according to claim 2.
The lower surface of the outer panel is sucked and fixed by the vacuum pad, and the upper surface of the inner panel is pressed by the inner panel fixing pad of the swing arm so that the outer panel and the inner panel are placed at predetermined positions on the hemming die. A method for processing a vehicle panel, which comprises performing roller hemming processing while maintaining a state in which the locator of the outer panel is retracted from the track of the roller in a fixed state.

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