JP2002219531A - Method and apparatus for hemming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for hemming capable of accurately hemming a workpiece whose hemming work surface is substantially perpendicular to the workpiece-mounting surface. SOLUTION: A hem-punch 25 blended integrally with a pre-hem blade 27 and a main hem blade 29 can be slidably movable to the horizontal direction together with a hem-punch holding frame 33 against the base frame 35. By raising a hem-die 17 on which a workpiece is set, a flange of outer panel of a back door in an automobile is pre-hem processed between the pre-hem blade 27 and the hem-die 17. The main hemming work is executed between the main hem blade 29 and the hem-die 17 by backing up the hem-punch 25 in the condition in which the hem-die 17 is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming method and a hemming apparatus for performing edge bending on a plate-like work.

[0002]

2. Description of the Related Art A back door 1 of an automobile shown in FIG. 37 has an inner panel 3 and an outer panel 5 as shown in FIG. 38 which is an enlarged sectional view taken along the line AA of FIG. When assembling the panels 3 and 5, the outer flange 5a of the outer panel 5 is bent, that is, hemmed. The hemming process is performed by bringing the upper hem blade 9 and the hem die 7 closer to each other with the inner panel 3 and the outer panel 5 set on the lower hem die 7.

On the other hand, the back door 11 of the automobile shown in FIG. 39 is bent so that the roof-side upper window frame portion 11a and the vehicle width direction window frame portion 11b wrap around the vehicle front side indicated by an arrow F. Is formed. In such a back door 11, the hemming process for the outer panel 5 is performed in the same manner as that shown in FIG. 38, as shown in FIG. The hem blade 9 and the hem die 7 are moved closer to each other with the inner panel 3 and the outer panel 5 set thereon.

[0004]

However, the outer panel 5 constituting the back door 11 shown in FIG.
On the other hand, when hemming is performed by moving the hem die 7 and the hem blade 9 close to each other in the vertical direction in the figure, as shown in FIG. 40, the flange 5a (shown by a two-dot chain line) after the hem processing faces the vertical plane. The angle α is smaller than the same angle α in the back door 1 in FIG. 37, in other words, the hemmed surface is almost perpendicular to the horizontal plane, so that the hem blade 9 rubs against the hemmed surface. However, there is a problem that high-precision hemming cannot be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to accurately perform hemming even on a work having a hemmed surface that is nearly perpendicular to a work mounting surface on a heme die.

[0006]

According to a first aspect of the present invention, a prehem blade is moved relative to a work mounting surface on which a work of a heme die is mounted, in a direction orthogonal to the work mounting surface. A pre-hemming process is performed between the hemming die and the hemming blade, and the main hemming blade is relatively moved in a direction substantially parallel to the work mounting surface to perform the main hemming process with the hemming die.

According to a second aspect of the present invention, there is provided a pre-hem blade for relatively moving in a direction orthogonal to a work mounting surface on which a work of a heme die is mounted and performing pre-hem processing with the hem die, and the work mounting surface. And a main hem blade for performing a main hem processing between the hem die and a relative movement in a direction substantially parallel to the hem die.

According to a third aspect of the present invention, in the configuration of the second aspect of the present invention, a first driving means for moving the hemmed die in a direction perpendicular to the work mounting surface and a base frame are provided. On the other hand, the pre-hem blade and the main hem blade integrated with each other are configured to have a second driving unit that slides and moves in a direction parallel to the work mounting surface.

According to a fourth aspect of the present invention, in the configuration of the third aspect, the hem punch holding frame for integrally holding the pre-hem blade and the main hem blade presses the hem die toward the main hem blade during the main hem processing. It is configured to include pressure means.

According to a fifth aspect of the present invention, in the configuration of the third or fourth aspect of the present invention, the base frame includes a first hem die.
It is configured to be able to move on the base portion installed via the driving means in the direction approaching and separating from the hemmed die.

According to a sixth aspect of the present invention, in the configuration of the second aspect, the prehem blade and the main hem blade integrated with each other are connected to a part of a link mechanism, and the other part of the link mechanism has A mounting surface parallel driving means for driving in a direction parallel to the work mounting surface, and a mounting surface orthogonal driving means for driving in a direction orthogonal to the work mounting surface, respectively; Means and mounting surface orthogonal drive means,
The pre-hem blade is moved together with the main hem blade via the link mechanism to be a standby position for pre-hem processing, and from this standby position, the hem die is moved in a direction orthogonal to the work mounting surface by driving the first driving unit. While performing prehem processing between the prehem blade and the prehem processing, the main hem blade moves in a direction substantially parallel to the work mounting surface integrally with the prehem blade through the link mechanism by the mounting surface parallel driving means. The present hemming process is performed between the hemming die.

According to a seventh aspect of the present invention, in the configuration of the sixth aspect, the pre-hem blade and the main hem blade integrated with each other are mounted on the base frame in parallel with the mounting surface provided on the base frame. The moving means and the mounting surface orthogonal driving means move via a link mechanism supported by the base frame.

[0013]

According to the first or second aspect of the present invention, the prehem processing is performed after the prehem blade is relatively moved in a direction orthogonal to the work mounting surface on the heme die. The hem blade and hem die move relative to each other in a direction substantially parallel to the work mounting surface to perform the hem processing, so that the hem processing surface is almost perpendicular to the work mounting surface. The hemming process can be performed with high accuracy.

According to the third aspect of the present invention, after the hem die is moved by the first driving means in a direction orthogonal to the work mounting surface and prehemed between the hem die and the prehem blade, the hem blade becomes the hem blade. Since the second driving means moves in a direction substantially parallel to the work mounting surface and performs the main hemming between the hemming die and the hemming surface, the hemming surface is almost perpendicular to the work mounting surface. On the other hand, hemming can be performed with high accuracy.

According to the fourth aspect of the present invention, since the pressing means for pressing the hem die toward the hem blade during the hem processing is provided, the hem processing can be performed reliably.

According to the fifth aspect of the present invention, since the base frame can move in the direction approaching and separating from the hem die, the base frame provided with the pre-hem blade and the main hem blade is separated from the hem die. Work set work for hemmedi becomes easy.

According to the sixth aspect of the present invention, the pre-hem blade is moved from the standby position of the pre-hem processing where the pre-hem blade is moved together with the main hem blade via the link mechanism by the mounting surface parallel driving means and the mounting surface orthogonal driving means. By driving the first driving means, the hem die moves in a direction perpendicular to the work mounting surface to perform prehem processing with the prehem blade, and the hem blade is driven by the mounting surface parallel driving means via a link mechanism. Since the main hemming process is performed integrally with the pre-hem blade in a direction parallel to the work mounting surface and between the hemming die and the hemming die, the hemming surface is formed into a work having a shape almost perpendicular to the work mounting surface. On the other hand, hemming can be performed with high accuracy.

According to the seventh aspect of the present invention, the pre-hem blade and the main hem blade integrated with each other are mounted on the base frame in parallel with the mounting surface parallel driving means and the mounting surface orthogonal driving means provided on the base frame. By means, the pre-hem blade and the main hem blade can be easily switched to the positions where the pre-hem processing and the main hem processing can be performed, since the pre-hem blade and the main hem blade are moved via the link mechanism supported by the base frame.

[0019]

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

FIG. 1 is a perspective view of a hemming apparatus showing a first embodiment of the present invention, and FIGS. 2 to 4 are side views of the same.
In this hemming device, the hemmed surface is perpendicular to the work mounting surface, as in the roof-side upper window frame 11a and the vehicle width direction window frame 11b of the back door 11 as shown in FIG. The part which is in a state close to is hemmed. Here, the work mounting surface is a surface parallel to the horizontal plane in FIGS. 2 to 4 and parallel to the base portion on which the work of the hemming device is mounted.

A lower hem die 17 on which a work W (see FIG. 9) in which these panels 13 and 15 are overlapped with each other is placed on a lifter base 19 with an upper panel as an inner panel 13 and a lower panel as an outer panel 15. Fixed. The lifter base 19 is a lifter cylinder 2 serving as a first driving means on the base portion 21 side shown in FIGS.
3 can move up and down. Actually, the lifter cylinder 23 is a device body frame of a hemming device L (see FIG. 8) installed on the base portion 21 and used for hemming another portion of the back door 11. It is installed above. In FIG. 8, the hemming device H is the hemming device in the present embodiment.

In FIG. 1, a hem punch 25 located above the hem die 17 has a prehem blade 27 on the left side in FIG.
Are integrally provided on the right side of the hem blade 29, and a holder 31 and a pair of hem punch holding frames 3 are provided.
3 and is held by the base frame 35.

The base frame 35 includes a pair of side frames 3 located near both ends of the hem punch 25 in the longitudinal direction.
7. A lower frame 39 and an upper frame 41 are provided to connect the lower end and the upper end of the side frame 37 to each other, and the lower frame 39 moves along the guide rail 43 installed on the base portion 21.
It is slidable in a direction approaching and separating from the hemmed die 17. In addition, the pair of side frames 37 mutually
It is connected and fixed by a connecting plate 42.

The above-described sliding movement of the base frame 35 is performed by a slide cylinder 45 as a third driving means provided on the base portion 21. That is, the piston rod 47 of the slide cylinder 45 is connected to the lower frame 39 via the bracket 49.

FIG. 5 is a perspective view from the rear side of the internal structure of the upper part of the hemming device from which one base frame 37 is omitted, and FIG. 6 omits the side frame 37 and the upper frame 41 (the hem die 17 is also omitted). FIG. 2 is a perspective view from above of a hemming device. A pair of hem punch holding frames 33 that hold the hem punch 25 via the holding tool 31 is supported on the lower surface of the upper frame 41 so as to be slidable in the same direction as the above-described sliding direction of the base frame 35 with respect to the base 21. I have.

This sliding movement is performed by the upper frame 41
This is performed by a blade switching cylinder 51 as a second driving means mounted on the lower surface of the blade. That is, the tip of the piston rod 53 of the switching cylinder 51 is connected to the connecting member 55 that connects the hem punch holding frames 33 to each other. The connecting member 55 and the side frame 3
A guide shaft 59 is connected to a support piece 57 provided on the rear side of the third frame 3 facing each other. The guide shaft 59 is connected to a pair of guide brackets fixed to the lower surface of the upper frame 41. It is slidable with respect to 61.

FIG. 7 shows the blade switching cylinder 5 from the state of FIG.
FIG. 2 is a perspective view of a state in which a guide bracket 1 and a guide bracket 61 are omitted. The hem punch holding frame 33 is a hem punch 2
A side opposite to the side on which 5 is held is provided with a downwardly bent portion 33a which is bent downward, and a hem pressing cylinder 63 as a pressing means is mounted on the hem punch 25 side of each bent portion 33a. The hem pressurizing cylinder 63 has a piston rod 65 capable of pressing the rear surface of the hem die 17 as shown in FIG. The lower bent portions 33a are connected to each other by a connecting plate 67.

FIG. 8 is a perspective view of the entire hemming apparatus system that includes the above-described book hemming apparatus H and performs the entire circumference of the back door 11. Detailed description of the structure of the hemming device L other than the book hemming device H is omitted, but these hemming devices L are provided with a pre-hem blade and a main hemm blade similarly to the book hemming device H. The hem die Ld used when performing the pre-hem processing and the main hem processing between the blade and the main hem blade, respectively, is installed on the lifter base 19 like the hem die 17 in the above-described book hemming apparatus H. Like the book hemming apparatus H, the entire hemming apparatus L is movable in a direction in which the pre-hem blade and the main hemm blade approach and separate from the hem die Ld.

Next, the operation of the hemming device H having the above-described configuration, together with the operation of the hemming device L, will be described with reference to FIGS.
7 will also be described. First, as shown in FIG. 2, the base frame 35 is retracted from the state shown in FIG. 1 by the slide cylinder 45, and the hem punch 25 is moved to a position displaced from above the hem die 17. At this time, the entire hemming device L is also retracted, and the pre-hem blade and the main hemm blade are moved to positions displaced from above the hem die.

In this state, as shown in FIG.
Is set on the hem dies 17 and Ld with the inner panel 13 on the upper side and the outer panel 15 on the lower side.
At this time, the outer panel 15 of the hemming device H
The peripheral flange F to be hemmed is bent in the horizontal direction in advance. The work for setting the work W described above can be easily performed because the hem punch 25 is located at a position displaced from above the hem die 17 and the pre-hem blade and the main hem blade on the hemming device L are also located at positions away from the hem die Ld.

Next, by moving the base frame 35 forward by the slide cylinder 45, the pre-hem blade 27 is moved to a position above the hem die 17 where pre-hem processing can be performed, as shown in FIG. At this time, the hemming device L is also advanced to a position where prehem processing can be performed.

The pre-hem blade in the hemming device L is movable with respect to the frame of the device main body, and when pre-hemming is performed, the pre-hem blade is located above the hem die Ld and between the main hem blade fixed to the frame of the device main body. It is possible to enter and leave. Therefore, in the state where the pre-hem blade 27 of the present hemming device H has moved above the hem die 17,
The prehem blade in the hemming device L is also advanced above the hemmed die Ld.

Here, FIG.
As shown in FIG. 11, the hemmed die 17 is raised, so that the flange F is prehemed by the hemmed die 17 and the prehem blade 27. Thus, the flange F is bent at about 45 degrees. At this time, the pre-hem processing is similarly performed on the hemming device L.

When the hemming device H and the hemming device L complete the pre-hem processing for the entire circumference of the workpiece W, the lifter base 23 is lowered by the lifter cylinder 23, and then the hem punch holding frame 33 is The hem punch 25 is moved forward so that the hem blade 29 is located in front of the flange F as shown in FIG.

Next, the lifter cylinder 23 shown in FIG.
As shown in (2), the hem die 17 is raised to the pre-hem complete position with the lifter base 19 raised, so that the flange F is located at the rear position of the main hem blade 29. From this state, as shown in FIG. 4 and FIG.
The hem die 17 is pressed forward by the hem pressurizing cylinder 63 while the hem punch 25 is retracted, thereby performing the hemming on the flange F.

When the hemming process by the present hemming device H is completed, the hemmer die 17 is lowered together with the lifter base 19 by the lifter cylinder 23 as shown in FIG. 5
1 moves the hem punch 25 backward. At this time, the prehem blade in the hemming device L is also retracted with respect to the device body frame.

Further, the base frame 35 is retracted to the position shown in FIG. 2 by the slide cylinder 45, so that the hem punch 25 comes to a position shown in FIG.

Thereafter, by raising the hemming die Ld together with the lifter base 19, the main hemming on the side of the hemming device L is completed, whereby all the hemming of the work W is completed. Then, the hemming device L
The work W is taken out while the whole is retracted from the hemmed die Ld.

As described above, according to the present hemming apparatus H, the hemmed die 17 is moved upward perpendicular to the work mounting surface (here, a horizontal plane) on the hemmed die 17 and is moved to the work W on the hemmed die 17. On the other hand, after performing the pre-hemming between the pre-hem blade 27 and the pre-hem blade 27, the main hemm blade 29 is moved in a horizontal direction parallel to the work mounting surface to perform the main hemm processing. Hemming can be performed with high accuracy even on a workpiece W having a shape close to vertical.

FIG. 18 is a perspective view of a hemming device showing a second embodiment of the present invention, and FIGS. 19 to 22 are side views of the same. The hemming die 17 of this hemming device is mounted on a lifter base 19, similarly to the hemming device of the first embodiment shown in FIG. That is, the hem die 17 is provided on the lifter cylinder 2 installed on the apparatus body frame of the hemming apparatus L shown in FIG.
3 moves up and down together with the lifter base 19.

The base portion 21 shown in FIGS.
Above, a base frame 69 is installed. The base frame 69 includes a bottom plate 71 fixed to the base portion 21.
And four side plates 73 erected on the bottom plate 71;
And a connection plate 74 for connecting the three. FIG. 23 is a perspective view in which the base frame 69 is omitted from the state of FIG.

At the substantially vertical center of the rear end of the side plate 73 opposite to the hem die 17, a cylinder mounting bracket 75 is provided.
Is mounted, and two adjacent cylinder mounting brackets 7
5 is provided with a hem pressurizing cylinder 77 as a mounting surface parallel driving means. A piston rod 79 of the hem pressurizing cylinder 77 is rotatably connected to one end of a first link 81 constituting a link mechanism via a rotation support shaft 83, and the other end of the first link 81 is connected to a hem punch. It is rotatably connected to the outer holding frame 85 via a rotation support shaft 87. The center of the first link 81 is rotatably supported by four side plates 73 by a center rotation support shaft 89.

The hem punch outer holding frame 85 is provided with a hem punch 93 via a holder 91 at a lower portion on the distal end side, and the hem punch 93 is integrally formed with a pre-hem blade 95 and a main hem blade 97, respectively. . Holder 91
Is extended between the pair of hem punch outer holding frames 85, and an intermediate portion thereof is held by the pair of hem punch inner holding frames 99. The pair of hem punch inner holding frames 99 are connected to each other by three connecting plates 101, and the hem punch outer holding frame 85 and the hem punch inner holding frame 99 are connected by two connecting plates 1.
03.

One end of a second link 105 constituting the above-mentioned link mechanism is rotatably connected to a lower portion on the rear end side of the hem punch inner holding frame 99 via a rotation support shaft 107. The other end of the link 105 is connected to the connecting link 109 constituting the link mechanism by a rotation support shaft 111.
Is rotatably connected via a.

The connecting link 109 has a projecting piece 10
9a, the protruding piece 109a has a piston rod 115 of a swing cylinder 113 serving as a mounting surface orthogonal driving means.
Is rotatably connected via a rotation support shaft 117, and the other end 109b is rotatably connected to a center rotation support shaft 89. The swing cylinder 113 is fixed in a state of being sandwiched between two center side plates 73.

Next, the operation of the above-structured hemming device will be described. First, the state shown in FIGS. 18, 19 and 23, that is, the state in which the hem pressurizing cylinder 77 has the piston rod 79 as the forward limit and the swing cylinder 11
3 is a state in which the piston rod 115 is set to the retreat limit,
The work W is set on the hemmed die 17, Ld (FIG. 2)
4). At this time, the entire hemming device L is retracted from the hemmed die Ld. As shown in FIG. 24, since the hem punch 93 is located at a position separated from the upper rear of the hem die 17, the work W can be set easily.

After the work W is set, the hem pressurizing cylinder 77 is set to the retreat limit as shown in FIGS. 20, 30 and 31, and the first link 81 is set upright. At this time, the second link 105 is also in the upright state. As a result, the hem punch 25 moves forward and the hem die 1
7 is the preheme standby position corresponding to the position above (FIG. 25). At this time, the entire hemming device L is also advanced to a position where prehem processing can be performed.

Thereafter, the piston rod 115 of the swing cylinder 113 is moved as shown in FIGS.
The third link 1
09 is superimposed on the second link 105, and the hem punch inner holding frame 99 connected to the second link 105 is pushed upward, so that the hem punch inner holding frame 99 and the hem punch outer holding frame 85 are moved upward. Then, the hem punch 93 is rotated around the rotation support shaft 87, and the hem punch 93 is brought into the pre-hem standby state in which the hem punch 93 approaches the hem die 17 (FIG. 26). At this time, the pre-hem blade in the hemming device L is also advanced with respect to the device main body frame above the hem die Ld.

In this state, as shown in FIGS. 21 and 34, the lifter base 19 is lifted by the lifter cylinder 23, and the flange F is prehemed (FIG. 27). Thus, the flange F is bent at about 45 degrees. At this time, as the lifter base 19 is raised, the hemming device L is also subjected to prehem processing similarly.

When the prehem processing is completed for the entire circumference of the work W by the hemming device and the hemming device L, the lifter base 19 is lowered by the lifter cylinder 23. At this time, the pre-hem blade in the hemming device L is retracted with respect to the device main body frame to a position deviated from above the hem die Ld.

Here, since the first link 81 and the second link 105 are parallel links, FIGS.
As shown in FIG. 36, by setting the hem pressurizing cylinder 77 to the forward limit, the links 81 and 105 rotate around the rotation support shaft 89, and accordingly, the hem punch outer holding frame 85 and the hem punch The hem punch 93 held by the inner holding frame 99 performs approximate horizontal linear movement, and the hem blade 97 moves horizontally with respect to the pre-hemmed flange F to perform the hem processing (FIG. 28). ).

Thereafter, by returning the swing cylinder 113 to the retreat limit, the hem punch inner holding frame 99 and the hem punch outer holding frame 85 are rotated by pulling the hem punch inner holding frame 99 downward through the second link 105. Rotate around the support shaft 87,
18 and 1 in which the hem punch 93 is separated from the hem die 17
9 and FIG. 23 (FIG. 29).

Thereafter, by raising the hemming die Ld together with the lifter base 19, the main hemming process on the hemming device L side is completed, thereby completing all the hemming processes on the work W on the entire circumference. Then, the hemming device L
The work W is taken out with the whole being retracted.

Also in the above-mentioned hemming device, the hemmed die 17 is moved upward perpendicularly to the work mounting surface (here, a horizontal plane) on the hemmed die 17 so that the pre-hem blade 95 After the pre-hem processing, the main hem blade 95 is moved in a horizontal direction substantially parallel to the work mounting surface to perform the main hem processing, so that the hem processing surface is perpendicular to the work mounting surface. Work W of similar shape
, The hemming process can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hemming device showing a first embodiment of the present invention.

FIG. 2 is a side view of the hemming device of FIG. 1 when a work is set and when a work is taken out.

FIG. 3 is a side view at the time of prehem processing in the hemming device of FIG. 1;

FIG. 4 is a side view of the hemming device shown in FIG. 1 at the time of actual hemming.

5 is a rear perspective view of an upper internal structure of the hemming device of FIG. 1 from which one base frame is omitted.

6 is a perspective view from above of an upper internal structure of the hemming device of FIG. 1 from which side frames and upper frames are omitted.

FIG. 7 is a perspective view of a state in which a blade switching cylinder and a guide bracket are omitted from the state of FIG. 6;

8 is a perspective view of the entire hemming device system including the hemming device of FIG. 1 for hemming the entire periphery of the back door.

FIG. 9 is an operation explanatory diagram showing a state in which a work is set on a hemmed die in the hemming device of FIG. 1;

FIG. 10 is an operation explanatory view showing a state where the base frame is advanced from the state of FIG. 9;

11 is an operation explanatory view showing a state in which the hemming die is raised from the state of FIG. 10 to perform preheming processing.

FIG. 12 is an operation explanatory view showing a state where the hem punch is advanced after the hem die is lowered from the state of FIG. 11;

FIG. 13 is an operation explanatory view showing a state where the hemmed die is raised from the state shown in FIG. 12;

14 is an operation explanatory view showing a state in which the hem punch is retracted from the state of FIG. 13 to perform the main hem processing.

FIG. 15 is an operation explanatory view showing a state where the hemmed die is lowered from the state shown in FIG. 14;

16 is an operation explanatory view showing a state where the hem punch is retracted from the state of FIG. 15;

FIG. 17 is an operation explanatory view showing a state where the base frame is retracted together with the hem punch from the state of FIG. 16;

FIG. 18 is a perspective view of a hemming device showing a second embodiment of the present invention.

19 is a side view of the hemming device of FIG. 18 at the time of setting a work and at the time of taking out the work.

20 is a side view of the hemming device of FIG. 18 before a prehem standby.

21 is a side view of the hemming device of FIG. 18 at the time of prehem processing.

FIG. 22 is a side view of the hemming device of FIG. 18 at the time of main hemming.

FIG. 23 is a perspective view of a state where a base frame is omitted from FIG. 18;

FIG. 24 is an operation explanatory view corresponding to FIG. 19;

FIG. 25 is an operation explanatory view corresponding to FIG. 20;

FIG. 26 is an operation explanatory view showing a state where the hem punch is leveled from the state of FIG. 25;

FIG. 27 is an operation explanatory diagram corresponding to FIG. 21;

FIG. 28 is an operation explanatory diagram corresponding to FIG. 22;

FIG. 29 is an operation explanatory view showing a state where the hem punch is swung backward from the state of FIG. 28;

FIG. 30 is a perspective view of a hemming device corresponding to FIG. 20;

FIG. 31 is a perspective view of a state where a base frame is omitted from FIG. 30;

FIG. 32 is a perspective view of a state where the hem punch is swung forward from the state of FIG. 30;

FIG. 33 is a perspective view of a state where a base frame is omitted from FIG. 32;

FIG. 34 is a perspective view of a hemming device corresponding to FIG. 21;

FIG. 35 is a perspective view of a hemming device corresponding to FIG. 22;

FIG. 36 is a perspective view of a state where a base frame is omitted from FIG. 35;

FIG. 37 is a front view showing a part of the back door of the automobile.

FIG. 38 is an enlarged sectional view taken on line AA of FIG. 37;

FIG. 39 is a front view showing a part of another back door in the automobile.

40 is an enlarged sectional view taken along line BB of FIG. 39.

[Explanation of symbols]

 W Work 11 Hem die 13 Inner panel 15 Outer panel 21 Base part 23 Lifter cylinder (first drive means) 27,95 Prehem blade 29,97 Hem blade 33 Hem punch holding frame 35,69 Base frame 45 Slide cylinder (third drive Means) 51 Blade switching cylinder (second drive means) 63 Hem pressurizing cylinder (pressurizing means) 77 Heme pressurizing cylinder (mounting surface parallel driving means) 81 First link (link mechanism) 105 Second link (Link mechanism) 109 Connecting link (Link mechanism) 113 Swing cylinder (Mounting surface orthogonal drive means)

Claims (7)

[Claims] A pre-hem blade relatively moves in a direction perpendicular to a work mounting surface on which a work of a heme die is mounted, and performs pre-hem processing with the hem die. A hemming method comprising: performing a main hemming process between the hemming die and the hemming die while relatively moving in a direction substantially parallel to a surface. 2. A pre-hem blade which relatively moves in a direction perpendicular to a work mounting surface on which a work of a hem die is mounted and pre-hemms with the hem die, and is substantially parallel to the work mounting surface. A hemming blade for performing a real hemming process between the hemming die and the hemming die while relatively moving in a desired direction. 3. A first driving means for moving a hem die in a direction orthogonal to a work mounting surface, and a pre-hem blade and a main hemm blade provided on a base frame and integrated with the base frame. 3. The hemming device according to claim 2, further comprising: a second driving unit configured to slide the workpiece in a direction parallel to the workpiece mounting surface. 4. A hem punch holding frame for integrally holding a pre-hem blade and a main hem blade includes a pressing means for pressing a hem die toward the main hem blade during main hem processing. The hemming device as described. 5. The base frame according to claim 3, wherein the hemmed die is movable on a base portion provided via the first driving means in a direction approaching and separating from the hemmed die. 5. The hemming device according to 4. 6. The pre-hem blade and the main hem blade integrated with each other are connected to a part of a link mechanism, and the other part of the link mechanism is mounted on the other side of the link mechanism to be driven in a direction parallel to the work mounting surface. A plane parallel driving unit and a mounting surface orthogonal driving unit that is driven in a direction orthogonal to the work mounting surface are connected to each other,
The pre-hem blade is moved together with the main heme blade via the link mechanism by the mounting surface parallel driving means and the mounting surface orthogonal driving means to a standby position for prehem processing, and the first driving means is driven from the standby position. The hem die moves in a direction perpendicular to the work mounting surface to perform prehem processing between the prehem blade and the prehem blade, and the hem blade is integrated with the prehem blade via the link mechanism by the mounting surface parallel driving means described above. 3. The hemming apparatus according to claim 2, wherein the hemming process is performed in a direction substantially parallel to the work mounting surface to perform the main hemming between the hemming die. 7. The pre-hem blade and the main hem blade integrated with each other are attached to the base frame by a mounting surface parallel driving means and a mounting surface orthogonal driving means provided on the base frame. 7. The hemming device according to claim 6, wherein the hemming device moves via a supported link mechanism.