JP2795397B2 - Hemming integral molding method and apparatus - 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 integral molding method and apparatus for fixing a stiffener to an edge of an outer skin, and more particularly to a hemming integral molding capable of forming a large bending angle by a simple mechanism. The present invention relates to a molding method and an apparatus therefor.

[0002]

2. Description of the Related Art There is known a hemming press technique in which an edge of an outer skin is folded back so as to hold the edge of a stiffener therebetween so as to integrate an outer plate and a reinforcing material.
As shown in the conventional hemming press procedure diagram in FIG. 5, this technology combines a stiffener 53 with an outer skin 52 having a rising portion 51 formed at a predetermined edge and a hemming press device. When it is set (a), the preliminary bending portion of the hemming press device lowers the rising portion 51 by a lateral X operation to an angle B at which a vertical Y operation within a certain bending angle A becomes possible (b), and then The main bending portion fixes the rising portion 51 to the stiffener by the vertical Y motion (c).

When the bending angle A exceeds a right angle, the bending moment due to the lateral X operation also acts on the main body 52 of the outer skin via the rising portion 51. It is difficult to ensure accuracy, and it is necessary to incorporate a new pre-bending part in the hemming press device to cope with such recent design trends. Since each of the pre-bending portion and the main bending portion is integrally provided, the configuration is complicated, and the production cost of the device is increased, and a large amount of maintenance is required to secure a predetermined processing accuracy. Therefore, a proposal to separate the pre-bending and the main bending, and to make each machine a dedicated machine to cope with the simplification of the configuration and the advancement of the processing is being studied.

[0004]

However, in the preliminary bending, it is necessary to combine the stiffener with the outer skin in advance in anticipation of the fall of the rising portion of the outer skin. However, even if each of them is made into a dedicated machine, a transporting section for bridging between them is required, and when all the processes are integrated, the configuration becomes more complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hemming process in which an edge of an outer skin is folded to fix the edge of a stiffener with the edge of the stiffener therebetween. Another object of the present invention is to improve processing accuracy and reduce manufacturing costs.

[0006]

In order to solve the above-mentioned problems, a rising portion rising to the rear side of the edge of the outer skin is pressed and bent, and the edge of the stiffener is bent by the bent rising portion. In the hemming integral molding method to be fixed to the back surface, the rising portion of the outer skin is the same as the rising portion that rises from the main body portion of the outer skin in the mounting direction of the stiffener, as long as the stiffener can be mounted from the rising portion. The outer skin has a rectangular cross-sectional shape consisting of a sloped part that slopes toward the main body, and a stiffener is attached to the back of the outer skin that has this raised part, and the sloped part of the raised part is tilted.
The portion is pressed from a substantially vertical direction and bent together with the upright portion to obtain a hemming integrated molding method according to claim 1.

Further, as an apparatus for performing the above method, there is provided a pressing means for pressing and bending a rising portion rising on the back side of the edge of the outer skin, and the bent rising portion causes the edge of the stiffener to be bent on the rear surface of the outer skin. In the hemming integrated molding device, the pressing means comprises: an upright portion that rises from the main body portion of the outer skin in the mounting direction of the stiffener; and a main body side of the outer skin within a range where the stiffener can be mounted from the upright portion. For the rising portion having a cross-sectional shape of a letter consisting of an inclined portion inclined to
The hemming integrated molding device according to claim 2 is provided with a movable portion that presses from a substantially vertical direction .

[0008]

[Function] The rising portion of the outer skin is inclined from the main body portion of the outer skin in the mounting direction of the stiffener to the main body portion of the outer skin within a range where the stiffener can be mounted from the rising portion. If the stiffener is attached to the back of the outer skin on which the rising portion is formed and set on the hemming integrated molding device, the movable portion of the integrated molding device is the same. the inclined portion of the rising portion with respect to the inclined portion
Performing bending in one step together with the standing portion is pressed from a direction substantially perpendicular Te.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

The present invention comprises two steps: a pre-processing apparatus for performing pre-processing on the outer skin, and an integrated forming apparatus for mounting the stiffener and integrally forming.

FIG. 1 is a partial cross-sectional view showing a die structure of the pre-processing apparatus.

The pre-machining device 1 comprises a lower die for setting a workpiece, and an upper die which moves downward with respect to the lower die. The lower die includes a bending die 4 and a horizontal punch 5 slidable with respect to the mounting plates 3a and 3b provided on the lower frame 2.

The bending die 4 is provided with bending surfaces 4b and 4c which are bent into a cross-section in the shape of a cross section at the side end side on the mounting surface 4a for setting a workpiece, and the bending surfaces 4b and 4c are The cylinder 4d for retreat is connected.

The bent surfaces 4b and 4c are erected from the main body of the outer skin in the mounting direction of the stiffener in order to press the edge of the stiffener, and are inclined to the main body side following the erected portion to reduce the pressing force. Corresponds to the slope to receive.

The horizontal punch 5 is opposed to the bending surface 4c of the bending die 4, and has a guide portion 5a having a spring for guiding the punching operation and biasing the bending die 4 away from the bending die 4, and a cam for the punching operation. It has an inclined surface 5b on the back side to be acted on.

The upper die of the pre-processing apparatus 1 is provided with a vertical punch 7 slidable along a vertical guide 6a of an upper frame 6 so as to face a bending surface 4b of a bending die 4 via a retracting cylinder 7a. ,
A holding pad 8 elastically supported in the vertical direction corresponding to the workpiece is provided, and a cam driver 9 facing the inclined surface 5b of the horizontal punch 5 is provided.

The vertical punch 7 is stroked by the cylinder 7a after the end of the punching operation. At this time, the cam driver 9 operates the horizontal punch 5. The holding pad 8 holds the workpiece 10 on the mounting surface 4a of the bending die 4 throughout the entire process.

The operation of the pre-processing apparatus configured as described above will be described.

FIG. 2 is a partial sectional view showing the operation of the pre-processing apparatus. When the outer skin is set as the workpiece 10 on the lower bending die 4 and the upper die descends, the vertical punch 7 presses the workpiece 10 while the vertical punch 7 presses the first surface with respect to the bending surface 4 b of the bending die 4. Make a bend.

The upper die is further lowered, and the cam driver 9 acts on the inclined surface 5b of the horizontal punch 5, and the horizontal punch 5 performs the second bending on the bending surface 4c of the bending die 4. At this time, the vertical punch 7 is stroked by the cylinder 7a.

By the first and second bending operations, an upright portion erecting from the main body of the outer skin in the mounting direction of the stiffener corresponding to the bending surface 4b of the bending die 4, and corresponding to the bending surface 4c. An inclined portion for receiving a pressing force is formed to be inclined toward the main body.

Next, when the upper die is returned upward, the horizontal punch 5 is returned along the guide portion 5a, and
When the bending die 4 is retracted by d, the workpiece 10 can be taken out. In this way, a rising portion for integrally forming the stiffener is formed. In addition, if the molding die for the main body of the outer skin is incorporated into the pre-processing device, the single processing of the outer skin including the molding of the main body is collectively performed.

FIG. 3 is a front view showing the entire structure of the integrated molding apparatus.

The integrated forming apparatus comprises a fixed die 12 for setting a workpiece and pressing means 13 for applying a pressing force to the workpiece on the fixed die 12.

The upper surface of the fixed mold 12 is
And a setting surface 12a on which the stiffener 11 is set, and has the same shape as the surface shape of the workpiece including the case where the outer skin 10 as the workpiece is protruded.

The pressing means 13 comprises an elevating body 15 guided up and down by vertical axes 14 and 14, and movable parts 16 and 16 acting on the workpiece in response to the descending operation of the elevating body 15.

The elevating body 15 has a lower working projection 15a,
It comes into contact with the movable parts 16 and 16 via rollers 15b and 15b provided in 15a, respectively. The movable portion 16 includes shaft support portions 12b and 12 provided on both sides of the fixed mold 12, respectively.
b so as to be rotatable with respect to the shaft support 12.
The end portion bent in an L-shape from b has a cam surface 16a facing the roller 15b and a cylindrical pressing portion 16c facing the upper surface of the fixed die 12.

The integrated molding apparatus having the above-mentioned structure is constituted by bonding a stiffener 11 to an outer skin 10 which has been processed as a single unit by a pre-processing apparatus.
When the elevating body 15 moves down along the longitudinal axes 14 and 14 after the setting, the movable portion 16 is rotated by receiving the lowering operation of the roller 15b on the cam surface 16a. 16c descends obliquely with respect to the fixed mold 12, and bends the rising portion 10a of the workpiece on the fixed mold 12.

FIG. 4 is a diagram for explaining the operation of the integral molding method according to the present invention.

As shown in FIG. 3A, the edge of the outer skin 10 is provided on the edge of the outer skin 10 for holding the edge 11a of the stiffener 11 from the main body of the outer skin in the mounting direction of the stiffener 11. Standing part 10b
And an inclined portion 10c inclined toward the main body portion 10 to receive the pressing force by the pressing portion 16c of the pressing means within a range where the stiffener 11 can be mounted following the upright portion 10b.
After forming a rising portion C having a V-shaped cross section by a pre-processing device, and attaching a stiffener 11 to the back surface of the outer skin 10 on which the rising portion 10a is formed,
The end of the inclined portion 10c of the rising portion is set with respect to the inclined portion.
It is pressed from a substantially vertical direction by a pressing portion 16c having a cylindrical surface, and is bent together with the upright portion 10b.

When the outer skin 10 has a projecting shape, the bending angle A between the main body of the outer skin 10 and the upright portion exceeds 90 degrees, and also in this case, the pressing portion 16c is inclined obliquely downward B. Since the pressing operation is performed, the main body of the outer skin 10 is set on the set surface 1 of the fixed mold 12 via the upright portion 10b.
2a, the rising portion 10a is the outer skin 10
Is subjected to a reliable bending action on the main body portion.

The pressing portion 16c is, as described above, the inclined portion 1
When the upright portion 10b is inclined in a direction substantially perpendicular to 0c, that is, in a diagonally downward direction B indicated by an arrow, and the upright portion 10b is inclined, as shown in the middle of bending in FIG. The upright part 10b is further inclined while the contact point is shifted to the upright part 10b side of the inclined part 10c.

When the inclined portion 10c reaches the edge 11a of the stiffener, the rising portion 10b of the rising portion 10a is bent together with the inclined portion 10c so as to surround the edge 11a of the stiffener as shown in the integrally molded state of FIG. Even when the bending angle A of the rising portion 10a exceeds 90 degrees, the stiffener 11 is formed by the hemming integral molding.
Is securely fixed to the back surface of the outer skin 10.

[0034]

As described above, the pressing means of the hemming integrated molding apparatus is provided for the rising portion of the outer skin having a rectangular cross-sectional shape consisting of the rising portion and the inclined portion. Of the outer skin where the stiffener is mounted after the rising portion is separately formed by providing a movable portion for pressing the rising portion from a substantially vertical direction with respect to the inclined portion. Even when the portion forms a large bending angle , the inclined portion of the rising portion is pressed by the movable portion from a direction substantially perpendicular to the inclined portion, and the bent portion is bent together with the rising portion in one step. The stiffener is securely fixed by the rising portion of the outer skin.

Therefore, by forming the rising portion of the outer skin into the above-mentioned shape, the stiffener can be mounted on the outer skin after the single processing, and the integral molding can be bent in one step. In addition, it is possible to cope with the case where the bending angle of the rising portion is large, and the pressing means can be constituted by the movable portion having a simple configuration.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a mold configuration of a pre-processing apparatus.

FIG. 2 is a partial cross-sectional view showing the operation of the pre-processing apparatus.

FIG. 3 is a front view showing the overall configuration of the integrated molding apparatus.

FIG. 4 is an explanatory view of an operation by the integral molding method according to the present invention.

FIG. 5 is a diagram showing a conventional hemming press procedure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pre-processing apparatus, 2 ... Lower frame, 4 ... Bending die, 4b, 4c
... bending surface, 5 ... horizontal punch, 5a ... guide part, 5b ... inclined surface, 6 ... upper frame, 6a ... vertical guide, 7 ... vertical punch, 10 ...
Outer skin, 10b: standing part, 10c: inclined part, 1
DESCRIPTION OF SYMBOLS 1 ... Stiffener, 11a ... Edge, 12 ... Fixed type, 12a
... set surface, 12b ... shaft support, 13 ... pressing means, 14 ...
Vertical axis, 15: elevating body, 15a: working projection, 15b: roller, 16: movable part, 16a: cam surface, 16c: pressing part,
A: bending angle, B: pressing direction.

Claims (2)

(57) [Claims] 1. A folding presses the rising portion which rises at the back edge of the outer skin, the hemming integral molding method of fixing the edge of the stiffener by rising portion that is the bent to the back of the outer skin, the outer The rising portion of the skin includes a rising portion that rises from the main body portion of the outer skin in the mounting direction of the stiffener, and an inclined portion that inclines toward the main body portion side of the outer skin within a range where the stiffener can be mounted from the rising portion. A stiffener is attached to the back of the outer skin where the rising portion is formed, and the inclined portion of the rising portion is pressed from the direction substantially perpendicular to the inclined portion to raise the rising portion. A hemming integral molding method, wherein the hemming is performed together with the part. 2. A hemming integral molding apparatus comprising a pressing means for pressing and bending a rising portion rising on the back side of the edge of the outer skin, and fixing the edge of the stiffener to the back surface of the outer skin by the bent rising portion. in the previous SL pressing means includes an inclined portion inclined to the main body portion side of the outer skin from the standing portion and the standing portion erecting from the body portion of the outer skin in the mounting direction of the stiffener in a range that allows the attachment of the stiffener for rising portion forming a f-shaped cross section consisting of an inclined portion of the rising portion, the
An integrated hemming device, comprising a movable portion that presses the inclined portion from a substantially vertical direction .