JPH03221214A - Pressing die for hemming - Google Patents

Abstract

PURPOSE:To precisely execute the hemming work by providing the upper bending blade which press the top of this flange part to the inner panel after pre- bending a flange part of outer panel with a pre-bending blade means and the moving means to move the side plate of the lower die back and forth against the flange part. CONSTITUTION:The 1st pre-bending for the flange part 21a of the outer panel 21 is executed with the pre-bending blade means 51. On the 1st pre-bending, because the core metal 37 is positioned inside the flange part, so the flange part is bent along this core metal, and the vertical wall of the flange part is prevented from falling down. After the 1st pre-bending is finished, the pre- bending blade means executes the 2nd pre-bending of the flange part. On the 2nd pre-bending, because the vertical wall of the flange part is bent to the inner panel side of the flange part so as to press to the side plate 90 of the lower die, so the shape of the vertical wall of the flange part is brought to follow the side plate of lower die, the virtual wall is formed to the required shape. After two pre-bendings is finished, the top part of the pre-bent flange part is pressed to the inner panel with the upper bending blade 81, and then the hemming work is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a press die for hemming, and more particularly to a hemming press die used for forming a corner edge having a negative angle.

[Conventional technology]

BACKGROUND ART Hemming is a process in which two pressed products are fixed by bending the flange of one of the pressed products and sandwiching the other, for example, when manufacturing automobile bodies.

Generally, the hemming process involves pre-bending the flange part and then bending the flange part to 180". An example of a device that performs this type of hemming process is:
For example, Japanese Unexamined Patent Publication No. 55-68133, Utility Model Application No. 59-
No. 39019 is known.

By the way, the ξ-anging process is not limited to the above-mentioned shape, but also includes a shape in which a corner edge is formed on the outer panel side.

FIG. 8 shows a hemming process for forming a corner edge. First, as shown in (A) of the figure, the outer panel 1 and the inner panel 2 are pressed together by a press-type core metal 15 in a state where they are overlapped. At the same time, the preliminary curved blade 16
moves toward the flange portion 1a of the outer panel 1, and the flange 1a is bent inward by the preliminary curved blade 16, as shown in (b) of the figure. When the preliminary bending of the flange portion 1a is completed, the core metal 15 follows, and then the upper bending blade 17 descends as shown in FIG. In this state, the vertical wall 1b of the flange 1a of the outer panel 1 is in close contact with the outer peripheral portion 11a of the lower die ti. When the upper curved blade 17 descends, the flange portion 1a is bent downward and the corner edge 18 is formed, as shown in (d) of the figure. However, in this state, the upper part of the vertical wall 1b of the flange portion 1a is attached to the lower mold 11 as shown in (E) of the figure.
Away from the outer periphery 11a of the 11 and falling inward 11 Yatare i!
Therefore, the shape of the corner edge 18 is not formed as designed, and the desired function cannot be achieved.

In order to solve this problem, it is required that the resultant bending force during preliminary bending be directed toward the base of the vertical wall of the flange portion.

[Problem to be solved by the invention] By the way, the corner edge formed by hemming process has
As shown in FIG. 9, there is one having a negative angle θ1 in the hemming direction. Corner edge 18' shaped as shown in FIG.
The pressed product formed with this is used, for example, in a vehicle podium 3 as shown in FIG. That is, in FIG. 10, the bending angle θ2 at the bending point Z0 is quite obtuse, so the curvature of the bending point Z appears large, resulting in poor appearance. Therefore, in the vehicle body 3, it is not aesthetically preferable to make the bending angle of the outer panel l a large obtuse angle.

In order to form the corner edge 18' shown in FIG. 9, the flange portion 1a is hemmed using a lower mold 11' as shown in FIG. A problem arises. That is, in order to set the outer panel 1, the side wall portion 11a' of the lower mold 11' has a vertical wall surface 11a'.
b', and when the outer panel 1 is set on the lower mold 11', a gap S0 is created between the flange portion 1a and the side wall portion 11a'. Therefore, it becomes impossible to accurately perform the ξ-ring process on the flange portion 1a. Therefore, as shown in FIG.
Z. As shown in FIG.
Problems arise such as the curvature of bending point Z0 and bending point Z0 becoming too large.

In addition, in order to carry the outer panel into and out of the lower mold while increasing the precision of the ξ-ring process, the first
As shown in Figure 4, it is necessary to lift one side of the outer panel 1 to a point where the corner edge hemming shape does not become a negative angle.However, if this method is used, the press mold may become larger and the structure may become complicated. There is. Furthermore, in this method, if corner edges 1B' are formed on both sides of the outer panel 1, it is impossible to hem both sides at the same time. Therefore, the method shown in FIG. 14 requires a two-step hemming process, resulting in a decrease in productivity.

Furthermore, even when the negative angle θ is −0 (not a negative angle), the outer panel is set with almost no play in relation to the lower mold, so when the lower mold hair outer panel is inserted,
After molding, it is difficult to remove the outer panel from the lower mold. Therefore, the workpiece transportability during press working is poor, and improvements have been desired.

The present invention has focused on the above-mentioned problems, and can prevent the vertical wall portion of the pre-bent flange portion from collapsing, and can form a highly accurate corner edge with a negative angle in one process. It is an object of the present invention to provide a hemming press die that can improve the loading and unloading of outer panels.

[Means to solve the problem]

A press die for hemming according to the present invention that meets this purpose includes: a lower die set with an outer panel and an inner panel stacked together, an upper die that can be raised and lowered relative to the lower die, and the upper die and the lower die. A core bar is swingably supported by a pad located between the mold and the core bar, and when the outer panel is pressed by the core bar, the flange part of the outer panel is pressed from the outside, and the flange part is pressed against the second part.
If you pre-bend it towards the inner panel along the metal line,
Preliminary bending blade means for performing a second preliminary bending of the flange portion bent after the core metal retreats toward the inner panel while pressing the vertical wall of the flange portion against the side plate of the lower die; and the preliminary bending blade means. an upwardly curved blade that presses the tip of the flange portion against the inner panel after preliminary bending of the flange portion of the outer panel; and a moving means that moves the side plate of the lower mold forward and backward relative to the flange portion. to be intimidating.

[Effect]

In the hemming press mold configured in this way,
A first preliminary bending of the flange portion of the outer panel is performed by the preliminary bending means B. In the first preliminary bending, since the core metal is located inside the flange part, the flange part is bent along the core metal, and the vertical wall of the flange part does not fall.

When the first preliminary bending is completed, a second preliminary bending of the flange portion is performed by the preliminary bending blade means.

In the second preliminary bending, the flange is bent toward the inner panel side so as to press the vertical wall of the flange against the side plate of the lower mold, so the shape of the vertical wall of the flange is different from that of the lower mold. The bottom of the vertical wall is shaped to the desired shape, following the shape of the side plate.

When the two preliminary bending processes are completed, the tip of the pre-bent flange portion is pressed against the inner panel by the upper bending blade, and the hemming process is completed.

Here, since the side plate of the lower mold can be moved forward and backward with respect to the flange portion by the moving means, when the side plate is retracted from the flange portion, the outer panel can be easily carried in and out of the lower mold. Even if the corner edge has a negative angle, when the side plate advances toward the flange portion, the side plate and the flange portion come into close contact with each other, making it possible to perform hemming with high precision.

[Example] Hereinafter, a preferred example of the hemming press die according to the present invention will be described with reference to the drawings.

1 to 7 show one embodiment of the present invention. Figure 1↓In the figure, 31 indicates the lower mold,
An outer panel 21 and an inner panel 22 are set on the lower mold 31. Inner panel 221;! , is placed on the upper surface of the outer panel 21. Outer panel 21
A flange portion 2 bent at a certain angle is provided on the outer periphery of the
1a is formed. Press section 21 in this state
Let Z l be the bending point at the base of a.

An upper mold 32 is located above the lower mold 31.
2 is attached to a ram of a press machine (not shown). A plate-shaped pad 34 that can be raised and lowered is disposed between the upper mold 32 and the lower mold 31. On the bottom of the pad 34,
A pre-shabad 35 is attached, and the pre-shabad 35 can come into contact with the lower mold 31 side via the outer panel 21. A rod 33 extending upward is attached to the pad 34, and the rod 33 is movably inserted through the upper mold 32.

As shown in FIG. 1, the pad 34 is suspended from the upper mold 32 via the rod 33 when the upper mold 32 is at the top dead center.

A core metal 37 is located between the pad 34 and the upper mold 32. The core metal 37 is swingably supported by the pad 34 via a core metal locus variable mechanism 36, which will be described later.

The lower end portion of one side of the core metal 37 is a core metal portion 37 that presses the flange portion 21a of the outer panel 21 and the inner panel 22.
It is formed in a.

The variable core trajectory mechanism 36 includes link arms 38, 38' operating arms 40. It has a first cam 45, a second cam 46, and rollers 47.50. two link arms 38
．． 38' are parallel, and each link arm 38.3
The connecting portion 8' is a bottle connection. That is, in this embodiment, a parallelogram link mechanism is constructed by the pad 34, the core metal 37, and the two link arms 38, 38'. One link arm 38 of the two arms 38, 38' is connected to the support column 34a of the pad 34 via a tension coil spring 39, thereby drawing the core bar 37 toward the pad 34. . The link arm 38' includes an actuation arm 40 having a fulcrum portion 48.
is swingably mounted.

A rotatable roller 47 is attached to the tip of the operating arm 40. The link arm 38' is provided with a stopper 49 that can come into contact with the operating arm 40. The actuating arm 40 can freely swing upward in the figure, and is prevented from swinging downward by coming into contact with a stopper 49.

On the upper surface of the pad 34, an absorber 41 is attached as an S shock-warming means. Noyo.

The tip of the rondo of the Kuab Soha 41 is the link arm 38.
It can come into contact with a stopper 42 fixed to. The shock absorber 41 moves the core metal 37 when the core metal 37 retreats.
It has a function of alleviating the impact acting on the variable core trajectory mechanism 36 that supports the core metal trajectory, and, for example, prevents the actuating arm 40 from jumping up due to the impact. A stopper 43 is attached to the upper surface of the band 34, which contacts the link arm 38 and positions the core bar 37 during the first preliminary bending.

A cam driver 44 for driving the core metal 37 is attached to the upper mold 32 . On the side of the cam driver 44 on the link arm 38' side, there is an operating arm 40! A first cam 45 is formed that can come into contact with the roller 47 attached thereto. When the roller 47 and the first cam 45 come into contact with each other, the core metal 37 contacts the flange portion 21a of the outer panel 21.
The core metal portion 37a presses the inner wall surface of the flannel portion 21a of the outer panel 21 and the inner panel 22.

In this embodiment, when the hemming process is completed and the upper mold 32 rises, the roller 47 and the first cam 45 come into contact again. Since the metal core 37 escapes, the core bar 37 does not interfere with the pressed product, and there is no problem in use. Further, a core metal 37 is provided on the side surface of the cam driver 44 on the link arm 38 side.
A second cam 46 is formed to perform forced return. This second cam 46 can come into contact with a roller 50 attached to the link arm 38 side. This second cam 46 and roller 50 constitute core metal return means. When the second cam 46 and the roller 50 come into contact, the two link arms 38 and 38' swing, and the core bar 37, which has been pushed diagonally downward, is pulled back diagonally upward. . In this embodiment, since the pressed product is large, the core metal 37 is supported via two sets of core metal trajectory variable machines 136.

In this way, since the movement of the core metal 37 is controlled by the variable core metal locus l5NII36 having a parallelogram link mechanism, the movement of the core metal 37 can be made smooth. Furthermore, although the core return means is constructed from the second cam 46 and the roller 50, it is also possible to construct it from only the tension coil spring 39.

Unlike the general hemming process, in the press mold in which the corner edge is shaped as a bottom, as in this embodiment, the first preliminary curved blade 51 and the second preliminary curved blade 71 as preliminary curved blade means, the upper curved blade (hem blade) 81 is used.

This is to ensure that the direction of the resultant bending force is directed toward the bending point Z1 when bending the flange portion 21a. Each of these preliminary curved blades 51.71 and the upper curved blade 8I are connected to the upper die 32.
It is designed to move as the body moves.

The first preliminary curved blade 51 is attached to a holder (child cam) 52, and the holder 52 is swingably supported by a block 55 via two arms 53 and 54.

The two arms 53, 54 are parallel, and the connecting portion between the holder 52 of each arm 53, 54 and the block 55 is a bottle connection. In other words, the holder 52, the block 55, and the two arms 53 and 54 constitute a parallelogram link mechanism. A guide roller 56 is attached to the arm 53. A driven body 58 in which a cam groove 57 is formed is attached to the block 55 . A tension coil spring 59 is connected to the arm 53, and the first preliminary curved blade 51 is urged in a direction away from the outer panel 21 by the tension coil spring 59. A bar 55a that can come into contact with the arm 54 is fixed to the block 55.

A side plate 90 of the lower die 31 is independently provided on the block 55. The side plate 90 is fixed to the end of the block 55, and the surface of the side plate 90 facing the lower mold 31 is connected to the lower mold 3.
It can come into contact with the forward positioning stopper 92 attached to 1. The upper tip of the side plate 9o protrudes toward the C gold 37, and forms a regulating surface 9 that regulates the flange portion 21a.
The angle 0a is approximately the same as the bending angle of the flange portion 21a. The side plate 9o can be moved forward and backward relative to the flange portion 21a by a moving means 95.

The moving means 95 includes a slide head 96, a rail 97, a holding bin 98, a tension coil spring 99, and a roller lOO.
, cam 101 , block 102 and fJI Fi
! 9 has been done. A slide hese 96 is attached to the lower surface of the flock 55, and the slide hese 96 is
It is slidably attached to a rail 97 fixed to the other end of the lower die 31. As a result, the side plate 9o
It is possible to move parallel to 7. A holding bin 98 is attached to the lower surface of the block 55. Lower mold 31
A retainer 102 that holds a trailing positioning stopper 103 is fixed to the other end. The backward positioning bar 103 can come into contact with the movable block 55. A tension coil spring 99 is interposed between the block 55 and the holding bottle 98. Professional,
The lever 55 is always urged in a direction away from the forward positioning stopper 92 by a tension coil spring 99. A rotatable roller 100 is provided on the opposite surface of the block 55 to which the side plate 90 is attached. The roller 100 can come into contact with a cam 101 fixed to the lower end of the cam driver 60. roller 1
00 and the cam 101 are in contact with each other, the side plate 90
is adapted to move forward toward the flange portion 21a, and on the other hand, when the roller 100 and the cam lot are not in contact with each other, the side plate 90 is separated from the flange portion 21a.

On the other hand, a cam dry harrow 0 for driving the first preliminary curved blade 51 is attached to the upper die 32.

The cam dry harrow 0 includes a cam 6 that can come into contact with the roller 56.
1 is fixed. A cam 62 for forced return is fixed directly above the cam 61 of the cam driver 60.

When the roller 56 and the cam 61 come into contact, the holder 52
swings toward the outer panel 21 side, and the first preliminary bending is performed.

FIG. 3 shows the first preliminary bending of the outer panel 2 by the core bar 37, as shown in FIG.
1 and the inner panel 22, the first preliminary curved blade 51
This is a bending process in which the flange portion 21a of the outer panel 21 is pressed from the outside and the flange portion 21a is bent toward the inner panel 22 along the core metal portion 37a.

A yoke body 65 is movably attached to the upper die 32 via a parallel non-knock mechanism having two arms 63 and 64. The yoke body 65 has two arms 66.
A holder 68 is swingably supported via a parallel link mechanism 67. The holder 68 is provided with a second pre-curved blade 71 for performing a second pre-bending process.

The second preliminary curved blade 71 is capable of vertically sliding contact with an upper curved blade 81, which will be described later. The arm 6 is attached to the Yoku body 65.
A stop and a pawl 69 that can come into contact with the holder 6 are fixed. Rotatable rollers 72 and 73 are attached to the holder 68 side of the two arms 66 and 67. The upper die 32 includes a compression coil spring 74 that urges the yoke body 65 downward.
is provided.

A roller 75 is rotatably attached to the lower end of the yoke body 65.

The roller 75 attached to the yoke body 65 is the driven body 5
8, the yoke body 65 is in contact with the guide skin 58.
a, the lower surface of the second pre-curved blade 71 comes into contact with the end surface of the flange portion 21a, and the second pre-bending process is performed. Bending surface 71 of second pre-curved blade 71
As shown in FIG. 7, a is inclined by an angle α with respect to the horizontal plane. This is to direct the resultant bending force during the second preliminary bending to the bending point Z1.

FIG. 4 shows the second preliminary bending. As shown in FIG. The bending surface 71a of the second preliminary curved blade 71 causes the vertical wall 21b of the flange portion 21a to become the regulating surface 90 of the side plate 90 of the lower die 31.
so that it is pressed against a (that is, the resultant bending force is the bending point)
This is a process of bending it toward the inner panel 22 (in a shape facing Zl).

The upper curved blade 8I is provided at the other end of the yoke body 65. As described above, one side surface of the upper curved blade 81 is capable of slidingly contacting the second preliminary curved blade 7I in the vertical direction. Second
When the preliminary bending process is completed and the upper die 32 is further lowered, the second preliminary curved blade 71 stops descending due to contact between the stopper 82 and the roller 73.

FIG. 5 shows a state in which the upper mold 32 has reached the bottom dead center,
In this state, the other ends of the two arms 66 and 67 constituting the parallelogram link mechanism further descend, and the upper curved blade 81 descends diagonally toward the flange portion 21a of the outer panel 21. There is. As a result, the upper curved blade 81
The pre-bent flange portion 21a is attached to the inner panel 2.
2.

Next, the operation of the above hemming press die will be explained.

In FIG. 1, first, the outer panel 21 and the inner panel 22 are set on the lower mold 31. In this state, the upper die 32 is located at the top dead center. When the outer panel 21 and the inner panel 22 are set on the lower mold 31, as shown in FIG.
Since the outer panel 21 is located away from the lower mold 31, it is easy to set the outer panel 21 on the lower mold 31. When the outer panel 21 and the inner panel 22 are completely set, the ram (not shown) of the press machine is lowered, and the upper die 32 is lowered accordingly. When the upper mold 32 starts lowering, the roller 100 provided on the block 55 and the cam 101 fixed to the lower end of the cam dry harrow 0 come into contact, and the side plate 90 moves toward the flange portion 21a, and the second As shown in the figure, the regulating surface 90a of the side plate 90 is in close contact with the flange portion 21a.

When the upper die 32 is lowered, the brake pad 35 attached to the lower surface of the pad 34 comes into contact with the upper surface of the outer panel 21, and the lowering of the pad 34 is stopped. Furthermore, upper mold 3
2 descends, the first cam 45 formed on the cam driver 44 comes into contact with the roller 47, and the core metal 37 swings diagonally downward toward the flange portion 21a of the outer panel 21.

Furthermore, when the upper mold 32 descends, the amount of swing of the core bar 37 becomes maximum, and the core bar 37a of the core bar 37 presses the inner wall surface of the flange part 21a of the outer panel 21 with sufficient force. Also, in this case, the cam 61 of the cam dry harrow 0
and the roller 56 attached to the arm 53 come into contact with each other, the first preliminary curved blade 51 moves based on each cam temporary, and the flange portion 21a of the outer panel 21 contacts the first preliminary curved blade 51.
A first pre-bending is performed by. As described above, the first preliminary bending is a bending process in which the flange portion 21a of the outer panel 21 is pressed from the outside by the first preliminary bending blade 51, whereby the flange portion 21a is folded along the core metal portion 37a. Can be bent.

When the first preliminary bending A of the flange portion 21a is completed and the upper mold 32 is further lowered, the first cam 45 and the roller 47
When the contact with the core bar 37 is completed, the core bar 37 is returned to its original position by the tension coil spring 39. At this time, the shock absorber 41 reduces the impact when returning. In this case, the core metal part 37a is bent at the bent flange part 21.
is returned without interfering with i.

Moreover, in this case, the roller 5 attached to the arm 53
6 and the cam 61 formed on the cam try harrow 0 for driving the first preliminary curved blade 51 are completed, and the first
The preliminary curved blade 51 retreats in the direction away from the flange portion 21a.

When the tracking of the core bar 37 is completed, the upper die 32 further descends, the roller 75 comes into contact with the guide 1158a of the driven body 58 attached to the lower die 31, and the yoke body 65 swings outward. do. When the yoke main body 65 swings, the second preliminary bending blade 71 moves toward the end face of the flange portion 21a, and the second preliminary bending blade 71 performs a second preliminary bending B on the flange portion 21a. As described above, in the second preliminary bending B, the flange portion 21a bent by the first preliminary bending is bent by the second preliminary bending surface 71a so that the vertical wall 21b of the flange portion 21a is bent by the side plate 90 of the lower mold 31. This is a bending process in which the flange portion 21a is bent toward the inner panel 22 side so as to be pressed against the regulating surface 90a of the flange portion 21a.As a result, the bent flange portion 21a becomes almost horizontal.

In this way, during the second preliminary bending, the locus of the second preliminary bending edge can be set in a specific downward diagonal direction so that the direction of the bending resultant force is the bending point Z, so that the bending surface 71
The contact angle β between the end face of the flange portion 21a and the end face of the flange portion 21a can be maintained at an optimal angle, and the vertical wall 21b of the flange portion 21a can be sufficiently pressed against the side plate 90 of the lower die 31. Therefore, the shape of the vertical wall 21b of the flange portion 21a follows the restricting surface 90a of the side plate 90 of the lower die 31, thereby preventing it from falling inward.

When the second preliminary bending is completed, the second preliminary curved blade 71 is
roller 73 and stopper 82. ! : The descent ends when it comes into contact with . The second preliminary curved blade 71 has a roller 75
enters the guide groove 58a of the driven body 58, thereby moving laterally. At the same time, the upper curved blade 81 descends toward the flange portion 21a from diagonally above, and the pre-bent flange portion 21a is pressed by the upper curved blade 81.
A corner edge 21C having a negative angle θ is formed. Upper curved blade 81
is lowered in a substantially oblique direction, so in this case as well, the vertical wall 21b of the flange portion 21a is aligned with the regulating surface 90a of the side plate of the lower mold 31.
This solves the problem of the flange portion 21a being bent inward from the lower end.

As described above, in this embodiment, since the preliminary bending of the flange portion 21a is performed by the first preliminary bending and the second preliminary bending, the flange portion 21a during the first preliminary bending is
There is no need to secure a large bending angle, and there is no need to secure a large space for moving the core bar 37 forward and backward.

Therefore, it is also possible to shorten the distance l from the end of the outer panel 21 to the protruding reinforcing portion 22a of the inner panel 22, increasing the degree of freedom in product design.

Furthermore, by making the second preliminary bending independent, it becomes more reliable to set the direction of the resultant bending force when bending the flange portion 21a toward the bending point Z.

When the hemming process is completed, the upper die 32 is raised, the contact between the roller 100 of the moving means 95 and the cam 101 is completed, and the block 55 is returned by the biasing force of the tension coil spring 99. Therefore, the side plate 90 is separated from the flange portion 21a, and the hemmed outer panel 21
And the inner panel 22 is easily taken out from the lower mold 31.

[Effects of the Invention] As explained above, when using the bending press die according to the present invention, the first preliminary bending and the second preliminary bending are performed by the preliminary bending blade means. It is possible to perform the cutting process without causing the vertical wall of the outer panel to collapse, and the aesthetic appearance of the pressed product can be improved. In other words, when bending the flange part, reduce the bending force as much as possible.
It becomes possible to direct the bending point toward the base of the vertical wall (bending point Z), and it is possible to reliably prevent the vertical wall from collapsing.

In addition, since the preliminary bending process can be performed in two steps, the bending angle during the first preliminary bending using the core metal can be reduced, and the space required for advancing and following the core metal can be reduced. can do.

Therefore, the distance from the end of the outer panel to the rising portion (protruding reinforcing portion) of the inner panel can be shortened, and the degree of freedom in product design can be increased.

Furthermore, since the side plate of the lower mold is moved forward and backward by the flange part ↓ by the moving means, even when molding a corner edge with negative angles on both sides, one process (one stroke) is required.
It is possible to perform press molding with high precision and increase the productivity of hemming processing. Further, when carrying in and out the outer panel and the inner panel, the side plate moves away from the flange part, so the outer panel and the inner panel can be easily carried in and out of the lower mold, and the workpiece transportability in press working can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view of essential parts of a hemming press mold according to a first embodiment of the present invention, and FIGS. 2 to 6 are cross-sectional views showing each step of hemming using the press mold of FIG. 1. Figure 7 is a cross-sectional view showing the movement of the second preliminary curved blade and the upper curved blade in the press mold of Figure 1, and Figures 8 (a) to (e) show each step of the hemming process for forming the corner edge. 9 is a sectional view of an outer panel with a corner edge having a negative angle. FIG. 10 is a sectional view of a vehicle body with a corner edge having a large obtuse angle. FIG. 12 is a perspective view of the corner edge of the outer panel bottom-shaped by the hemming press mold shown in FIG. 11; FIG.
FIG. 14 is a cross-sectional view of the outer panel and inner panel whose bottoms have been shaped by the hemming press mold shown in FIG. 21... Outer panel 21a... Flange portion 21b... Vertical wall 22... Inner panel 31... Lower mold 32... Upper mold 34... Pad 36... Core metal locus variable mechanism 37... Core metal 51... First pre-curved blade (pre-curved blade means) 71
...Second pre-curved blade (pre-curved blade means) 81...
...Upper bending blade 95...Moving means A...First preliminary bending B...Second preliminary bending Zl...Bending point allowance Applicant Toyota Motor Corporation Figure 9 11 Figure 11 Figure 13 Figure 10 Figure 12 Figure 14

Claims (1)

[Claims] 1. A lower mold set with an outer panel and an inner panel stacked together, an upper mold that can be raised and lowered with respect to the lower mold, and a position between the upper mold and the lower mold. a core bar swingably supported by a pad that presses the outer panel by the core bar, pressing a flange portion of the outer panel from the outside to pre-bend the flange portion along the core bar toward the inner panel side; , a preliminary bending blade means for performing a second preliminary bending of the flange portion bent after the core metal retreats toward the inner panel while pressing the vertical wall of the flange portion against the side plate of the lower mold; After the flange portion of the outer panel is preliminarily bent by the means, an upwardly curved blade presses the tip of the flange portion against the inner panel; and a moving means for moving the side plate of the lower mold forward and backward with respect to the flange portion. A press die for hemming that is characterized by: