JP3008790B2 - Hemming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming apparatus for integrating a work panel made of an inner and an outer plate by bending one edge flange to the other, and particularly to performing a preliminary hemming process prior to the main hemming process. The present invention relates to an improvement in the structure of a hemming processing device suitable for a machine.

[0002]

2. Description of the Related Art An example of such a hemming apparatus is shown in FIG. In the figure, a base body 1 of a hemming apparatus is fixed on a lower platen (not shown), a base end of which is connected to a support shaft 11 provided on the base body 1, and is rotatable in a vertical plane. Is provided with an arm body 2. A bending blade 4 is attached to the arm body 2. The bending blade 4 is a head 41 whose tip is bent, and the front sieve of the head 41 is a pressing surface 4a.

[0003] The upper end of the above-mentioned arm body 2 (right side in the figure)
The spring member 5 is stretched between the arm member 2 and the locking piece 13 of the base body 1. Usually, the stopper 27 on the rear surface of the base end of the arm body 2 comes into contact with the stopper piece 14 of the base body 1. The bending blade 4 is turned obliquely forward and upward (the chain line in the figure).

A work panel W composed of an inner plate P2 and an outer plate P1 is placed on the curved and inclined mold surface of the lower die body 102, and the inner plate P2 is superimposed on the outer peripheral edge of the outer plate P1. The edge flange P11 formed on the outer plate P1 is substantially upright along the outer periphery of the inner plate P2 (a chain line in the figure) . The inclination angle of the outer peripheral portion of the outer plate P1 from the horizontal is α.

When the upper die (not shown) is operated and the striker provided thereon comes into contact with the roller 28 at the upper end of the arm body 2, the arm body 2 moves counterclockwise against the spring force of the spring member 5. Rotate, the bending blade 4 is swung down as shown in the figure,
The pressing surface 4a causes the edge flange P11 to be bent toward the outer peripheral portion of the inner plate P2 ( solid line in the figure). At this time, the approach angle of the bending blade 4 forms an angle of θ from the horizontal.

[0006]

If the approach angle θ is close to the inclination angle α of the outer plate P1, as shown in FIG. 9, the load F when bending the edge flange P11 is parallel to the outer plate P1. Since the component force F1 becomes excessive, the outer plate P1 is liable to be distorted such as a chip. To prevent this, it is preferable to increase the approach angle θ, but for this purpose, in the above-described conventional apparatus, it is necessary to move the fulcrum 11 of the arm body 2 upward.
However, in this case, there is a problem in that the clearance between the upper mold and the upper mold becomes small due to an increase in the height of the apparatus, and it becomes difficult to carry out the work panel after processing.

An object of the present invention is to provide a hemming apparatus capable of effectively preventing the distortion of a work panel during processing while maintaining the apparatus height low.

[0008]

According to a first configuration of the present invention, a base 1 provided on a lower mold 10 is provided.
The first arm member 2 is pivotally supported at one end 21, a second arm member 3 having a base end to the arm body 2 of the first is pivotally supported, the
The contact piece 81 protruding from the second arm body 3 and the second
A bending blade 4 provided at the tip 32 of the arm body 3 for bending the edge flange P11 of the work panel W, and a relatively spring force provided between the first arm body 2 and the base body 3 . The small first spring member 5 and the contact piece 81
The second spring member 6 having a relatively large spring force disposed between the first arm body 2 and the upper die 9, and abuts on the contact piece 81 during the movement thereof, The first arc
The body 2 against the spring force of the first spring member 5.
And a single striker 7 for rotating the second arm 3 against the spring force of the second spring member 6.
Is provided.

[0009]

[0010] In the second configuration of the present invention, the second arm member 3 at the base end 31 of the parallel link 8A, the 8B pivoted to the first arm member 2 of the tip 23, the parallel link 8
A contact piece 8 where the striker 7 contacts one of A and 8B.
1 is protruded.

[0011]

In the first structure, when the striker 7 comes into contact with the hitting piece 81 during the movement, the first arm is first opposed to the spring force of the first spring member 5 having a relatively small spring force. The body 2 rotates, and the bending blade 4 moves accordingly. Further, when the striker 7 moves and the first spring member 5 reaches the deformation limit, the rotation of the first arm body 2 stops, and then the second spring member 6 having a relatively large spring force is released. The second arm body 3 starts rotating against the spring force, and the bending blade 4 moves accordingly. Thus, since the bending blade 4 is sequentially moved by the two arms 2 and 3 having different pivot points, the movement trajectory of the bending blade 4 can be largely bent, and the bending blade 4 can be bent without increasing the apparatus height. The approach angle can be set large.

[0012]

In the second configuration, the parallel links 8A, 8A
B allows the posture of the second arm body 3 to be kept constant during its rotation.

[0014]

In FIG. 1, a guide post 104 is erected at the center (right side in the figure) of a surface plate 101 of a lower die 10 so as to stand up.
The lifter 103 is supported and fixed to this. Lifter 10
A lower die main body 102 is erected at an outer position of 3, and a work panel W is mounted on a curved die surface at an upper end thereof.
The work panel W is composed of an outer plate P1 curved along the mold surface and an inner plate P2 superimposed on the outer plate P2 to form a closed sectional space, and the upper edge of the outer plate P1 bends and extends obliquely upward. It is an edge flange P11. The work panel W is lifted by the lifter 103 to a feed level for the lower die body 102. The lower mold body 102
A stopper member 105 protrudes from the outer side surface of the hemming apparatus H toward the first arm body 2 of the hemming apparatus H.

Outside the lower die body 102, a hemming device H, which will be described in detail later, is provided at a plurality of positions in the circumferential direction (one of which is shown in the figure).
Faces the edge flange P11 of the work panel W.

An upper die body 92 is provided at the center of the lower surface of the surface plate 91 of the upper die 9, and a pressure pad 93 is fixed to the tip of a guide post 94 movably supported by the upper die body 92. The pressure pad 93 presses the inner plate P2 of the work panel W from above to position the upper panel when the upper mold is lowered (or when the lower mold is upper bound). Upper die body 9
A bending blade (main bending blade) 95 is fixedly attached to the outer peripheral portion of the work panel 2 with its wedge-shaped tip directed downward.
Is located directly above the edge flange P11.

A support leg 71 projects downward from the outer peripheral portion of the lower surface of the surface plate 91, and a triangular striker 7 is provided on the inner surface of the tip. The slope 7 a of the striker 7 is located immediately above the hitting piece 81 of the hemming device H.

The hemming apparatus H is installed on a spacer 106 provided on the surface plate 101, and its details are shown in FIG. In the figure, a plate-like base body 1 positioned horizontally is fixed to the spacer 106, and a support shaft 11 is provided on one upper surface and a stopper piece 12 is provided on the other upper surface. The base end 2 of the first arm body 2 is attached to the support shaft 11.
1, the first arm 2 is entirely rotatable in a vertical plane. The first arm body 2 has a substantially L-shape when viewed from the side in the figure, and the whole is inclined backward (to the left in the figure) so that the lower surface of the bent portion 22 contacts the inclined end surface of the stopper piece 12. ing.

A stopper piece 25 is provided on the upper surface of the base end 21 of the first arm body 2, and two upper and lower portions are provided on the side surface of the distal end 23 of the first arm body 2 extending upward. And one end of each of the parallel links 8A, 8B. A projecting portion 24 is further formed at the tip end 23 of the arm body to the rear. A spring member 5 is stretched between the projecting portion 24 and the locking piece 13 projecting from the other end of the base body 1. The spring member 5 biases the first arm body 2 to rotate counterclockwise about the support shaft 11. The base side surface 21a of the arm body 2 is provided with a stopper provided on the lower mold body 102 (FIG. 1).
It faces the member 105.

[0020] The parallel link 8A, the other ends of the 8B is the
The base end 31 of the second arm body 3 is connected, and the bending blade 4 is attached to the distal end 32 of the second arm body 3 which faces obliquely upward. The bending blade 4 becomes a head 41 whose tip is bent,
The distal end surface of the head 41 is a pressing surface 4a. The upper link 8A of the parallel links 8A, 8B projects upward in a substantially triangular shape to form a contact piece 81, and a spring member 6 is provided between the tip of the contact piece 81 and the projecting portion 24 of the first arm body 2.
Is stretched out. The spring force of the spring member 6 causes the
The second arm body 3 is provided at one end fulcrum 8 of the parallel links 8A and 8B.
The upper surface of the base end 31 abuts against the stopper piece 26 provided on the front surface of the arm body distal end 23, and the lower surface of the second arm body 3 is
The arm member 2 is spaced apart from the stopper piece 25 provided at a predetermined interval. The contact piece 81 of the upper link 8A
Is provided with a roller 82, which faces the lower slope 7a of the striker 7 located immediately above the roller 82. The spring force of the spring member 6 is set sufficiently higher than that of the spring member 5.

In the hemming apparatus having the above structure, when the upper die 9 is lowered, the striker 7 moves downward integrally therewith, and its slope 7a comes into contact with the roller 82 provided on the contact piece 81 of the upper link 8A. As a result, the parallel links 8A and 8B have one-end fulcrums 83 and 84, respectively.
A clockwise turning operation force acts on the first arm body 2 around the support shaft 11. Here, since the spring force of the spring member 5 is relatively small, the first arm body 2 resists the spring force of the spring member 5 before the parallel links 8A and 8B rotate. Rotate in the direction. First arm 2
Reaches the horizontal position, the base side surface 21a abuts against the stopper piece 105 (FIG. 1) and stops rotating. During this time,
The bending blade 4 moves from the X position to the Y position in FIG.

When the striker 7 moves further downward,
Instead of the first arm body 2 whose rotation is restricted, the parallel links 8A and 8B rotate clockwise around the fulcrums 83 and 84 against the spring force of the spring member 6 to rotate the parallel links 8A and 8B.
The second arm body 3 connected to 8B rotates clockwise around the fulcrums 83 and 84 while maintaining its posture.
This rotation stops when the lower surface of the second arm body 3 comes into contact with the stopper piece 25 provided on the first arm body 2. During this time,
The bending blade 4 moves from the Y position to the Z position in FIG. Thus, the movement trajectory of the bending blade 4 is indicated by circles 1 and 2 in the figure,
First, it moves gently forward and downward, then changes direction largely and moves slightly backward.

FIG. 4 shows the relative positions of the upper die 9 and the lower die 10 in this state, and the work panel W placed on the lower die main body 102 by the movement of the bending blade 4 (shown by a dashed line). The edge flange P11 of the outer plate P1 is pressed by the pressing surface 4a of the bending blade 4, and is largely bent toward the outer peripheral edge of the inner plate P2 as shown by the solid line in the drawing. Note that the inner plate P2 is pressed by the pressure pad 93 in order to prevent the work panel W from being displaced at this time.

In this embodiment, the angle of entry θ of the bending blade 4 when bending the edge flange is sufficiently large with respect to the inclination angle α of the outer peripheral portion of the outer plate as shown in FIG. The component force parallel to the outer plate is sufficiently small.
Therefore, the outer plate does not have a distortion such as a mark. Further, even if a large approach angle of the bending blade 4 is secured, the apparatus height during standby can be reduced by h as shown in FIG.

When the upper die 9 further moves down and the striker 7 moves downward, the rollers 82 move the slope 7 a of the striker 7.
The first and second arm members 2 and 3 are returned to their original positions by the respective spring members 5 and 6. This is shown in FIG. 7, and instead of the bent blade 4 retreated, the tip of the bent blade 95 provided on the upper die body 92 abuts on the edge flange P11. It is folded until it presses on the periphery, and the hemming process is completed.

After the hemming process is completed, the upper die 9 is raised to the original position shown in FIG. 1, and the work panel W is carried out of the die. It is preferable in terms of production efficiency that the unloading direction (white arrow B in the figure) coincides with the work loading direction (white arrow A in the figure). As described above, since the height of the tip of the bending blade during standby is kept low in the hemming device H according to the present invention, a sufficient clearance can be secured between the hemming device H and the upper die 9 and the workpiece can be unloaded. Becomes easier.

Although the above embodiment has been described with reference to the case where the upper die moves up and down with respect to the stationary lower die, the present invention is naturally applicable to the case where the lower die moves up and down with respect to the stationary upper die. is there.

[0028]

As described above, according to the hemming apparatus of the present invention, the height of the apparatus can be kept low and the opening of the work panel can be sufficiently secured, and the distortion of the work panel during processing can be effectively prevented. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a mold provided with a hemming apparatus according to the present invention.

FIG. 2 is an overall side view of a hemming apparatus showing one embodiment of the present invention.

FIG. 3 is an overall side view showing the operation of the hemming apparatus.

FIG. 4 is a partial sectional side view showing the operation of the mold.

FIG. 5 is an enlarged sectional view of an outer peripheral edge of a work panel placed on a lower die main body.

FIG. 6 is a schematic side view comparing the height of the device of the present invention and the height of a conventional device.

FIG. 7 is a partial sectional side view showing the operation of the mold.

FIG. 8 is an overall side view of a conventional hemming apparatus.

FIG. 9 is a diagram comparing the approach angle of the bending blade and the inclination angle of the work.

[Explanation of symbols]

 Reference Signs List 1 base body 2 first arm body 3 second arm body 4 bending blade 5 first spring member 6 second spring member 7 striker 8A, 8B parallel link 81 piece per piece 9 upper mold 10 lower mold 105 stopper piece ( Stopper member)

Claims (2)

(57) [Claims] 1. A base provided on a lower die, a first arm having one end pivotally supported by the base, and a second arm having a base end pivotally supported by the first arm. The body and the second
A contact piece protruding from the arm body; a bending blade provided at a tip of the second arm body for bending an edge flange of the work panel; and a bending blade disposed between the first arm body and the base body.
A first spring member having a relatively small spring force is, the
A second spring member having a relatively large spring force disposed between the contact piece and the first arm body , provided on the upper die,
The movement middle in contact with the per piece, the first earth
The body against the spring force of the first spring member.
And a single striker for rotating the second arm body against the spring force of the second spring member. 2. A base end of the second arm body is pivotally supported on a distal end of the first arm body by a parallel link, and a contact piece protruding from one of the parallel links to contact the striker is provided.
The hemming apparatus according to claim 1 .