JP2550083Y2 - Hemming device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a process of assembling a work comprising an outer plate and an inner plate such as a door or a hood of an automobile, and bending the outer edge of the outer plate by winding the inner plate around the inner plate. The present invention relates to a hemming device used for integration.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Publication No. 57-22653, a fixed bracket having a lower die for setting a work and a ram that moves up and down above the lower die is provided on a side of the lower die. At the upper end of the work, a hemming arm that extends inward and that can contact the bent part of the work is pivotally attached to the upper and lower sides so as to be able to swing vertically, and the hemming arm is pressed down by lowering the ram to perform hemming of the work. Are known.

Further, as described in the above-mentioned publication as a prior art, the bracket can be swung outwardly away from the lower mold with the pivot below the fulcrum as a fulcrum, and the hemming arm is moved from the fulcrum to the bracket. It is formed in the shape of a bell crank having an extending portion extending upward, and the bracket is swung inward through a cam suspended from the ram when the ram is lowered, and the upper end of the extending portion of the hemming arm is moved by the cam. There is also known an apparatus that pushes inward to swing a hemming arm downward to perform hemming of a workpiece.

[0004]

When the work is automatically transferred by the transfer arm inserted between the lower mold and the ram, the hemming arm is projected onto the work so that the work can be picked up straight from the lower mold. Although it is necessary to retreat to the outside of the surface, if the hemming arm is pivotally mounted on the fixed bracket as in the former prior art, the hemming arm must be swung upward largely, and as a result, the transport arm It is necessary to move the transfer arm at a relatively high position so as not to interfere with the hemming arm when swinging, and it is necessary to raise the ram ascending position when opening the mold, which takes time to open the mold. The lifting / lowering stroke of the transfer arm when attaching / detaching the work to / from the lower mold becomes longer, and it takes time to attach / detach the work, and the productivity is reduced.
Further, in the latter conventional technique, the swinging of the bracket to the outside allows the arm to retreat outside the projection surface of the work without opening the hemming arm largely upward. This causes a problem of interference of the transfer arm with the projecting portion, and in particular, it is necessary to increase the length of the extending portion in order to increase the hemming force. In the same manner as described above, it takes time to open the mold and attach / detach the work, thereby lowering productivity. In view of the above points, the present invention is directed to a hemming device in which the height of the uppermost portion of the hemming arm at the time of opening the mold is kept low, and the workpiece can be automatically transferred without raising the ram to a high position. Its purpose is to provide.

[0005]

In order to achieve the above object,
The present invention includes a lower die for setting a work and a ram that moves up and down above the lower die, and a bracket is erected on a side of the lower die,
The bracket is swingable outwardly away from the lower mold with the lower pivot as a fulcrum, and at the upper end of the bracket,
An inwardly extending hemming arm that can contact the bent part of the work is pivotally attached to the vertical direction so as to be swingable in the vertical direction, and when the ram is lowered, the bracket is swung inward via a cam that is suspended from the ram. In an apparatus for hemming a workpiece by swinging a hemming arm downward, an extension portion extending substantially horizontally outward from a fulcrum with respect to a bracket is formed in the hemming arm, and the extension portion and the lower portion of the bracket below the bracket are formed. A first link having an upper end pivotally connected to the extension portion and a second link having a lower end pivotally connected to the base end portion are provided between the lower end of the first link and the upper end of the second link. A toggle link which is pivotally attached is provided, and the hemming arm is pivoted downward by the cam via the toggle link.

[0006]

When the ram descends, the bracket swings inward via the cam, and the cam swings the hemming arm downward via the toggle link, thereby hemming the bent portion of the work set on the lower die. The arm abuts from above and hemming is performed with a large force provided by the toggle link. When the mold is opened by raising the ram after the hemming process, the hemming arm swings upward and returns, and the bracket swings back to the outer escape position. The arm retreats outside the projection plane of the work. Further, since the arm is connected to the toggle link at the horizontal extending portion, the position of the extending portion does not increase as in the conventional bell crank-shaped hemming arm, and the hemming arm when the mold is opened. The height of the top of the can be reduced. Thus, when the work is automatically transferred by the transfer arm, even if the transfer arm is moved at a relatively low position, interference with the hemming arm does not occur, and the height of the ram can be set lower by that amount. The time required for opening the work is reduced, and the lifting stroke of the transfer arm when the work is attached to and detached from the lower die is shortened, so that the time required for the work for attaching and detaching the work can also be shortened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a lower die, and 2 denotes a ram provided above and below the lower die 1 so as to be movable up and down. The lower die 1 is formed by combining an outer plate Wa and an inner plate Wb. After setting work W,
The ram 2 is lowered, the bent portion Wc of the outer edge of the outer plate Wa is bent halfway toward the edge of the inner plate Wb as shown in FIG. 2, and preliminary hemming is performed. After opening, the transfer arm 4 attached to the transfer bar 3 that moves back and forth and up and down is caused to enter between the lower mold 1 and the ram 2 by the movement of the transfer bar 3 from a direction perpendicular to the plane of the drawing, and then the transfer arm 4 Lower the arm 4
The work W is sucked by the sucker 4a suspended from the lower mold 1, and then the work arm W is lifted from the lower mold 1 by raising the transfer arm 4.
In this state, the transfer arm 4 is moved to transfer the work W to the next stage where the main hemming is performed, and the work W is hemmed by the transfer method.

A fixing plate 5 is provided below the side of the lower mold 1, and an inverted T-shaped bracket 6 having a horizontally long base end 6a is provided below the lower end 1 of the base 6a. At the end, it is pivotally attached to the stay 5a on the fixed plate 5 via a pivot 6b so as to be able to swing outward, and the upper end of the bracket 6 is provided with a processing claw 7a at the inner end which comes into contact with the bent portion Wc.
The hemming arm 7 having a vertical axis is pivotally connected via a pivot 7b. The hemming arm 7 has an extension 7c extending substantially horizontally outward from a support for the pivot 7b.
Are formed integrally, and a toggle link 8 is provided between the extension 7c and the base end 6a of the bracket 6,
The hemming arm 7 is swung by the toggle link 8. The toggle link 8, the first link 8 ₁ which is pivotally mounted via a pivot 8a of the upper end in the extending portion 7c, the proximal portion 6a
The through pivot 8b of the lower end and a ₂ second link 8 pivotally mounted, a first link 8 ₁ of the lower end in a state of sandwiching between bifurcated portions of the second link 8 ₂ of the upper end as shown in FIG. 3 Axis 8c
And pivotally connected to each other.

[0009] toggle link 8 is biased so as to bend the shape rather substantially laterally outward by a spring 9 which is stretched between the stay 5b extending to the outer end of the second link 8 ₂ and the fixed plate 5 As a result, the hemming arm 7 is biased and held at the open position where the hemming arm 7 is swung upward with respect to the bracket 6, and the bracket 6 is biased by the spring 9 acting via the toggle link 8. Upper stopper 10
Is biased and held at the outer escape position regulated by On the other hand, as shown in FIG.
a roller 11 is provided at the extended end of b.
As shown in FIG. 3, the first link 8 ₁ is connected to the toggle link 8.
A roller 12 supported by a pivot 8c is provided between the two forked portions of the lower end of the ram 2, and each of the rollers 11,
A first and a second pair of cams 13 and 14 cooperating with the cam 12 are vertically provided.

Thus, according to the lowering of the ram 2, as shown in FIG. 2, the first cam 13 contacts the roller 11, the bracket 6 swings inward from the escape position, and the second cam 14 The toggle link 8 is pressed inward by contact with the roller 12, and the hemming arm 7 is swung downward through the link 8 so that the processing claw 7a comes into contact with the bent portion Wc to perform hemming processing. At this time, the swing angle of the hemming arm 7 with respect to the bracket 6 is restricted by a stopper 15 that regulates the operation amount of the toggle link 8 provided on the bracket 6,
And the final position of the hemming arm 7 is the stay 5a.
Restricted by the upper stopper 16, the bent portion Wc is accurately bent at a predetermined angle.

After performing the hemming process as described above,
Raise the ram 2 and open the mold.
Is swung to the outward relief position, so that the processing claw 7a can be moved to the workpiece W without swinging the hemming arm 7 upward largely.
The toggle link 8 for swinging the hemming arm 7 is located below the arm 7 so that the arm 7 can be retracted to the outside of the projection plane of FIG. The upper position can be lowered, so that even if the transfer arm 4 is moved at a relatively low position, interference with the hemming arm 7 does not occur. Since the moving height of the transfer arm 4 can be reduced in this manner, the height of the ram 2 can be set relatively low, so that the time required for opening the mold can be shortened. By shortening the vertical stroke of the transfer arm 4, the time required for attaching and detaching the work W can be shortened.

Although the embodiment in which the present invention is applied to an apparatus for performing a preliminary hemming process on a work has been described above, the present invention can be similarly applied to an apparatus for performing a main hemming process. The present invention can also be applied to an apparatus that performs the above steps simultaneously.

[0013]

As is apparent from the above description, according to the present invention, the hemming force can be increased by swinging the hemming arm by using the toggle link, and the top of the hemming arm when the mold is opened. The position of the transfer arm can be kept low.When the work is automatically transferred by the transfer arm, the height of the transfer arm can be set low. In addition to shortening the time required for the work of attaching and detaching the mold, the height required for opening the ram at the time of opening the mold can be set to be low, so that the time required for opening the mold can be shortened, and the productivity is greatly improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of an example of the present invention device in a mold open state.

FIG. 2 is a cross-sectional view corresponding to FIG. 1 during hemming processing;

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV of FIG. 2;

[Explanation of symbols]

1 Lower mold 2 Ram 6
Bracket 6a Base end 6b Axis
7 Hemming arm 7c Extension 8 Toggle link
8 ₁ First link 8 ₂ Second link 13, 14 Cam

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Michio Nakamura 1-10-1, Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (56) References JP-A-1-249257 (JP, A) JP-A 1-1107925 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A lower die for setting a work and a ram that moves up and down above the lower die. A bracket is erected on the side of the lower die, and the bracket is separated from the lower die with a pivot below the fulcrum. A hemming arm that extends inward and that can contact the bent part of the work is pivotally attached to the upper end of the bracket so that it can freely swing up and down. In a device for hemming a workpiece by swinging a bracket inward through a vertically provided cam and swinging a hemming arm downward, an extension extending substantially horizontally outward from a fulcrum for the bracket by the hemming arm. A first link having an extension formed between the extension and a base end below the bracket, and a second link having an upper end pivotally attached to the extension and a lower end pivotally attached to the base end; And the lower end of the first link and the second A hemming device, wherein a toggle link pivotally connected to an upper end of the link is interposed, and the cam causes the hemming arm to swing downward through the toggle link.