JPH0999790A - Method and device for reinforcing bumper fascia - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drastically enhance the rigidity of a bumper fascia by superposing a tip of bent-piece situated to ward the free-end side from an integral hinge on an outer peripheral edge part or a rib, which is not bent, of a product to form a hollow section, thereby connecting a bumper fascia to a main body of an automobile via a superposed part. SOLUTION: After a bumper fascia 1 is taken out of an injection molding die, an integral hinge 3 is bent into nearly an L-shape to obtain a bent piece 4. The bent piece 4 is brought closer to a web 7, while an outer peripheral surface of a rib 6, which is provided around an installation hole 5, is fitted into a hole 8 drilled in the web 7. Then, two surfaces, or the tip end side of the bent piece 4 and the tip end side of the web 7, come near to each other, and a section having a hollow sectional form like a square, in which a hollow part 9 is formed along the longitudinal direction is formed, is formed. With this contrivance, the reinforcing effect in the bumper fascia 1 is remarkably enhanced, while the rigidity of the upper part of the bumper fascia 1 is drastically enhanced. In addition, with regard to a center-upper edge part 2 and the bent piece 4, wall thickness as desired can be obtained in a stable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing the bumper fascia of a thermoplastic resin bumper for an automobile and an apparatus therefor, which improves the rigidity of the bumper fascia in secondary processing after molding. is there.

[0002]

2. Description of the Related Art Conventionally, in order to reinforce a plastic bumper, Japanese Patent Application No. 59-98364 and Japanese Patent Application No. 5-18983.
No. 6 is known. In the former case, at least one end of the upper edge bending portion and the central rib portion is provided with an extension portion that is bent by an undercut portion, and the extension portion is provided on the side of the central rib portion or the upper edge bending portion side where the extension portion is not provided. Is refracted and is engaged with this. The latter is integrally formed with a thick bead portion whose inner peripheral surface is flush with the general portion and protrudes toward the outer peripheral surface along the longitudinal direction on the upper surface of the bumper fascia. The hollow portion is formed along the longitudinal direction of the bead portion by using a gas injection method together with the bead portion.

[0003]

However, the above-mentioned conventional techniques have the following drawbacks. The former is intended to prevent the upper edge bent portion from hanging down, so that the tip of the bent extension portion is only in contact with a portion facing the tip portion. Therefore, when the upper edge bending portion is lifted up, the abutting relationship between the tip of the extension and the tip of the extension is easily canceled and the hollow closed cross section is lost. Therefore, although it has an effect of preventing the upper edge bent portion from hanging down, it cannot prevent deformation in the rising direction. In addition, since it is a property peculiar to polypropylene resin that cracks or damages do not occur in this portion even if the portion where the wall thickness is locally thinned is refracted, this configuration limits the bumper material to polypropylene resin. . Furthermore, even in the case of polypropylene resin, if the wall thickness is made to be 0.5 mm or more and refracted, cracks are likely to occur at this portion, so the thickness must be made 0.5 mm or less. This is an obstacle to trying to increase the strength of this site.

Further, in the latter, although the mold structure can be simplified and the rigidity of the bumper fascia upper surface can be enhanced, a special device for supplying an inert gas into the injection molding mold is required. However, since this device is expensive, the manufacturing cost of the molded product is high. Further, it is difficult to inject the inert gas while the resin material is being filled in the injection molding die, and a thick portion where the hollow portion is formed often has a defect such as a lack of a wall, a sink mark, or a weld line. It is easy to get defective products. Furthermore, the plate thickness of the thick wall portion in which the hollow portion is formed is larger than the wall thickness of the general portion, and since the thickness cannot be controlled, the weight becomes heavy.

The present invention has been made to solve the above-mentioned conventional problems, and the secondary processing after injection molding firmly reinforces the edge portion of the bumper fascia, and the cost of the reinforcing processing is low. It is an object of the present invention to provide a reinforcing method and its device.

[0006]

According to a first aspect of the present invention, there is provided a bumper fascia reinforcing method, wherein the bumper fascia is integrally formed with an outer peripheral edge portion of a product or a rib standing adjacent to the outer edge portion. The integral hinge that is formed as a result of bending, and the tip of the bent piece on the free tip side of the integral hinge is polymerized with the outer peripheral edge of the product that does not bend or the rib to form a hollow cross-section and the polymerized portion is formed. It is characterized in that it is connected to the main body of the vehicle through.

According to a second aspect of the present invention, the bumper fascia reinforcement method is characterized in that the outer peripheral edge portion of the product or the tip side of the rib standing upright adjacent to the edge portion is melted and softened to bend, and the tip portion of the bent piece. Is polymerized with the outer peripheral edge of the product which does not bend or with the rib to form a hollow cross-section, and the hollow cross-section is connected to the automobile body through the overlap.

According to a third aspect of the bumper facia reinforcement method, an L-shaped piece integrally formed on the outer peripheral edge of the product is melted.
It is characterized in that it is softened and bent to form a U-shaped cross section.

According to a fourth aspect of the present invention, there is provided a device used to reinforce a bumper fascia, which has a product outer peripheral edge portion and a rib standing upright adjacent to the edge portion. A jig capable of supporting a thermoplastics product having an extension extending to the edge side through a bending line formed in the predetermined position, and a proximity to the thermoplastics product supported by the jig. A bending means is provided which is releasable and abuts on the extension portion to pivot the extension portion to bend to the outer peripheral edge of the product where the bending line is not formed or to the rib side which is erected adjacent to the outer peripheral edge. And a bending device.

The apparatus used to reinforce the bumper fascia of claim 5 is a jig capable of supporting a thermoplastics product at a predetermined position, and the thermoplastics product supported by the jig. A softening means that can be moved toward and away from each other and can soften a required portion of the thermoplastic plastic product linearly, a means for moving the softening means closer to and away from a required portion of the thermoplastic plastic product, and a portion softened by the softening means. And a bending device having a bending member having a bending member capable of bending the softened portion by pressing a plastic product closer to the edge.

[0011]

In the present invention described above, the end portion of the L-shaped section or the U-shaped section formed without forming the undercut portion on the inner surface of the bumper made of thermoplastic resin is softened by heating. When the bending member is brought into contact with the end portion to linearly melt and soften the longitudinal direction of the bumper, the bending member is brought into contact with the end portion and the bending member is moved in a direction intersecting with the end portion. The side is bent. At this time, the initial cross section was "L" shaped, and the cross section was deformed into a "U" shape. The initial cross section was "U" shaped. It is transformed into a hollow closed section.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

[0013]

Example 1 (A) and (B) of FIG. 1 are views showing an example of a bumper fascia 1 manufactured by the method of the present invention.
A bent piece having a substantially L-shaped cross section through an integral hinge 3 integrally formed at a tip of a central upper surface edge portion 2 of the outer peripheral edge portion of the bumper fascia 1 excluding the bumper-side portion. 4 are connected. An appropriate number of mounting holes 5 are formed through the bent piece 4, and ribs 6 surrounding the mounting hole 5 are projected on the surface of the bent piece 4 that faces the central upper surface edge portion 2.
Then, the integral hinge 3 is bent to form the rib 6
The outer peripheral surface of the web 7 adjacent to the inside of the central upper edge 2
A hollow portion 9 is formed along the longitudinal direction by being fitted in a hole 8 penetratingly provided to the front end side of the bent piece 4 and the facing surface of the front end side of the web 7 abutting each other.

In order to manufacture the bumper fascia 1 having such a structure, the injection molding die 10 shown in FIG. 2 is used to perform injection molding by a conventional method. That is, the molding cavity R formed by closing the fixed mold 11 and the movable mold 12 is filled with molten resin from a runner and a gate (not shown) and integrally molded at the tip of the central upper edge 2. A bent piece 4 having a substantially L-shaped cross section is integrally connected via an integral hinge 3 and a web 7 is integrally provided adjacent to the inside of the central upper surface edge portion 2. Mold Bumper Facia 1.

After completion of molding, the injection mold 10 shown in FIG.
When the movable die 12 is separated from the fixed die 11 by a conventional method, the inclined pin 16 projecting on the fixed die 11 and the movable die 12 are attached to the movable die 12 so that the undercut on the outside of the bumper fascia 1 can be performed. The slide core 13 is slidably contacted with the hole 13a formed through the slide core 13 to be processed.
Moves backward to completely open the molding gap R. Then, when the pushing plate 15 is brought close to the movable die 12 by a conventional method, the pushing pin 14 separates the bumper fascia 1 from the movable die 12, so that the bumper fascia 1 is taken out by an appropriate means.

After the bumper fascia 1 is taken out from the injection molding die 10, the integral hinge 3 is bent from the state shown in FIG. 3 (A) by an appropriate means to make a cross section "L" as shown in FIG. 3 (B). The bent piece 4 in the shape of a letter “web 7”
When the outer peripheral surface of the rib 6 provided around the mounting hole 5 is fitted into the hole 8 penetrating the web 7, the front end side of the bent piece 4 and the facing surface on the front end side of the web 7 come close to each other. As a result, a hollow cross-section having a hollow square shape is formed in which the hollow portion 9 is formed along the longitudinal direction.

The bumper fascia 1 thus constructed is
The reinforcing effect is significantly improved, and the rigidity of the upper surface of the bumper fascia 1 is significantly improved. Further, since the central upper surface edge portion 2 and the bent piece 4 are formed by a fixed gap formed by the fixed die 11, the movable die 12, the slide core 13 and the like, which is a constant gap, the thickness thereof is a desired thickness. Can be obtained stably. As a result, there is no delay in cooling due to instability of the wall thickness, and the bumper fascia 1 with extremely small molding strain can be obtained. Of course, since the wall thickness is constant, the bumper fascia 1 without defects such as sink marks and flow marks can be obtained.

The same actions and effects can be obtained by the arrangements shown in FIGS. 6 (A) to 6 (D). That is, FIG. 6 (A)-
As shown in (C), the central upper edge 2 of the bumper fascia 1
Integral hinges 3 formed integrally with 2, 23, and 24 are bent, and bent pieces 42, 43, and 44 extending from the integral hinges 3 toward the tip side are formed on the outer peripheral edge of the product or inside the outer peripheral edge. It is also possible to form a hollow cross-section by superposing it with the rib 71 adjacent to it, and connect it to the automobile body via the superposed section.

Further, as shown in FIG. 6D, the integral hinge 3 integrally formed with the central upper surface edge portion 25 of the bumper fascia 1 is bent, and the bent piece 45 extending from the integral hinge 3 to the tip side. It is also possible to form a “U” -shaped cross-section portion with the central upper surface edge portion 25 and connect it to the automobile body through the bent piece 45. This way,
The rigidity cannot be improved as much as that of the hollow section, but it is
Since the cut portion can be eliminated, there is an effect that the slide core becomes unnecessary and the injection molding die can be made inexpensive.

[0020]

[Embodiment 2] FIG. 4 shows a second embodiment of a method for reinforcing a bumper fascia according to the present invention. The same parts as those shown in FIG. 1 used in the description of the first embodiment are designated by the same reference numerals, and redundant description will be omitted in the second and subsequent embodiments.

The feature of the second embodiment is that the method of reinforcing the bumper fascia 1 is the same as in the first embodiment, and the web 7 of the central upper surface edge portion 21 having an L-shaped cross section is formed as a product outer peripheral edge portion. The tip side parallel to is melted and softened by, for example, the device shown in FIGS. 8 and 9 and bent, and the tip of the bent piece 41 is polymerized with the web 7 to form a hollow cross-section. The point is that the bumper fascia 1 is connected to the automobile body via the.

For example, the injection molding die 1 shown in FIG.
0, injection molding is carried out in the same manner as in Example 1, and the fixed mold 11
A molten resin is filled in a molding space R formed by closing the movable die 12 and the slide core 13, and a bent piece 41 extending upward in a direction intersecting with the web 7 is formed at the tip of the central upper surface edge portion 21. The bumper fascia 1 integrally molded with is molded.

After the bumper fascia 1 was taken out of the injection molding die 10 in the same manner as in Example 1, the bent piece 41 was changed to the one shown in FIG.
4B, the heating means is brought into contact with the tip side of the central upper surface edge portion 21 in the state of the two-dot chain line to soften it, and then this portion is bent to form the state shown in FIG. As shown in (B), when the bent piece 41 is brought close to the web 7 and the mounting hole 5 and the hole 8 penetrating the web 7 are aligned so that the bent piece 41 and the facing surface on the front end side of the web 7 come close, A hollow cross-section having a hollow square shape is formed in which a hollow portion 9 is formed along the direction.

The operation of the second embodiment is similar to that of the first embodiment, and the reinforcing effect is remarkably improved and the rigidity of the upper surface portion of the bumper fascia 1 is remarkably improved. Further, since the central upper surface edge portion 21 and the bent piece 41 are formed by a fixed gap formed by the fixed die 11, the movable die 12, the slide core 13, etc., the wall thickness thereof is a desired thickness. Can be obtained stably. As a result, there is no delay in cooling due to instability of the wall thickness, and the bumper fascia 1 with extremely small molding strain can be obtained. Of course, since the wall thickness is constant, the bumper fascia 1 without defects such as sink marks and flow marks can be obtained.

Note that the same operation and effect can be obtained even with the arrangements shown in FIGS. That is, FIG. 6 (A)-
As shown in (B), a mounting hole 5 is horizontally penetrating the edge of the central upper surface of the bumper fascia 1, and the bumper fascia 1 is mounted to the vehicle body through the mounting hole 5 in the central upper surface. Ribs 72 adjacent to the inside of the edge,
After the heating means is brought into contact with the central portion of 73 to soften it, this portion is bent from the position of the two-dot chain line in the direction of the arrow to bend the bent piece 72.
a, 73a close to the central upper surface edge, and mounting holes 5 and ribs 7
2 or the holes 8 penetrating the ribs 73 are aligned so that the bent pieces 72a, 73a and the facing surface on the front end side of the central upper surface edge portion are brought close to each other, a cross section having a hollow portion 9 formed along the longitudinal direction A'-shaped hollow cross-sectional shape is formed. In addition, 6 is a rib provided around the mounting hole 5, and 19 is a reinforcing rib protruding in parallel with the rib 73.

As shown in FIG. 6C, heating means is brought into contact with the central portion of the central upper surface edge portion 22 of the bumper fascia 1 to soften it, and then this portion is bent in the direction of the arrow from the position of the two-dot chain line. When the central upper surface edge portion 22 is brought close to the web 7 and the mounting hole 5 and the hole 8 penetrating the web 7 are aligned so that the central upper surface edge portion 22 and the facing surface on the front end side of the web 7 are brought close to each other, A hollow cross-section having a square-shaped cross section is formed along with the hollow portion 9.

[0027]

[Third Embodiment] FIG. 5 shows a third embodiment of a method for reinforcing a bumper fascia according to the present invention. The same parts as those shown in FIG. 1 used in the description of the first embodiment are designated by the same reference numerals, and a duplicate description will be omitted.

The third embodiment is characterized in that the bumper fascia 1 is reinforced in the same manner as in the second embodiment by using the horizontal portion of the central upper surface edge portion 21 having an L-shaped cross section as a product outer peripheral edge portion. The tip end side of the bent piece is melted and softened in the same manner as in the second embodiment and bent to form a "U" -shaped cross section, and the bent piece 4 is formed.
The bumper fascia 1 is connected to the automobile body via the tip of the automobile 1.

The operation of the third embodiment is the same as the first embodiment,
Similar to the second embodiment, the reinforcing effect is improved, and the rigidity of the upper surface portion of the bumper fascia 1 is considerably improved, though not so much as in the first and second embodiments. In addition, the central upper edge 2
As in the first and second embodiments, the bending piece 41 and the bending piece 41 are molded into a constant void portion formed by an injection molding die, so that a desired wall thickness can be stably obtained. As a result, there is no delay in cooling due to instability of the wall thickness, and the bumper fascia 1 with extremely small molding strain can be obtained. Of course, since the wall thickness is constant, the bumper fascia 1 without defects such as sink marks and flow marks can be obtained.

[0030]

[Fourth Embodiment] The fourth embodiment is a bending device for bending the central upper surface edge portion 21 of the second and third embodiments. In FIGS. 8 to 9, the bending device 30 includes a base portion 32, a robot and the like. A connecting portion 31 is formed to be connected to another driving device, and the first air cylinder 3 is attached to a base portion 32 separated from the connecting portion 31.
4 is rotatably mounted via a pivot 33, the tip of the output shaft 34a of the air cylinder 34 is connected to the bending substrate 35 via the pivot 36, and the output shaft 34a expands and contracts by the operation of the first air cylinder 34. Base 32 and bending substrate 35
The bending base plate 35 is configured to pivot about a pivot shaft 37 that pivotally attaches and.

On the right end surface of the bending board 35, the central upper edge 2 is formed.
A bending member 38 having substantially the same length as the longitudinal length of the central upper surface edge portion 21 along the longitudinal direction of 1 is integrally attached, and an extension portion 38a extending upward above the bending member 38 has a length of the bending member 38. Direction, they are appropriately spaced and project in appropriate numbers,
A flange 39 is attached to the extension portion 38a so that its position can be adjusted in the axial direction of the extension portion 38a.

The second air cylinder 40 is attached to the base 32 above the bending board 35, and the tip of the output shaft 40a is the base 3.
2 is connected to the left end of an arm 52 which is inserted into a guide hole 51 penetrating a guide member 50 attached to the movable member 50 and is movable back and forth.
When 0a expands and contracts, the arm 52 moves to the left and right.

A third air cylinder 53 is provided at the right end of the arm 52.
The tip end of the output shaft 53a attached to and extending downward is connected to the upper end of the softening member 54. When the output shaft 53a expands and contracts by the operation of the third air cylinder 53, the softening member 54 moves up and down. The tip 5 of this softening member 54
Reference numeral 5 is a pointed tip having a vertical angle of 90 degrees, a nichrome wire is embedded in the tip portion, and the surface is non-adhesive treated by Teflon coating or the like so that molten plastic does not adhere.

The operation of the structure of the fourth embodiment will be described. In FIG. 8, the bumper fascia 1 is the web 7
All other points are the same as those in the second embodiment except that a U-shaped cutout hole 8a is formed on the end face of the member when viewed from the direction of the arrow P. The same parts as those shown in FIG. 4 are designated by the same reference numerals, and the duplicated description will be omitted. If the cutout hole 8a is formed in the end face of the web 7, not only the slide core 13 becomes unnecessary in the injection molding die shown in FIG. 4 (A), but also the mounting hole 5 has a "R" -shaped cross section. The bumper fascia 1 can be firmly attached to the vehicle because it can be brought as close as possible to the reinforcing portion.

After the central upper edge 21 of the bumper fascia 1 is opened to hold the bumper fascia 1 at a predetermined position of a jig (not shown), for example, via a connecting portion 31 to the arm tip of a robot (not shown). When the bending substrate 35 of the bending device 30 which is detachably connected is pivoted 90 degrees toward the web 7 side, as shown in FIG. 9, the central portion of the central upper surface edge portion 21 is bent at a substantially right angle to form the cutout hole 8a. The bending device 30 attached to the tip of the robot arm is brought close to the bumper fascia 1 according to a program taught to the robot in advance so that the attachment hole 5 is exposed to the bumper fascia 1. Then, the second air cylinder 40 is operated to contract the output shaft 40a to move the arm 52 to the left and the softening member 54 to the left, and the tip 55 of the softening member 54 is moved to the left.
When it is moved to a predetermined position in the space between the second air cylinder 53 and the third air cylinder 53, the output shaft 53a is contracted, the softening member 54 is raised, and the tip 55 is moved to the central upper surface edge portion 21.
Is brought into contact with a predetermined position on the inner surface of the.

At this time, the central upper surface edge portion 21 with which the tip 55 abuts by the heat conducted from the tip 55 which is embedded in the tip of the softening member 54 and is energized to generate heat to heat the nichrome wire. 8 is melted, and finally, as shown by the chain double-dashed line in FIG.
The softening member 54 stops rising at a position where the softening member 54 reaches a predetermined amount (the stopper is stopped by a not-shown conventional method).

Subsequently, when the timer provided on the control panel (not shown) counts up, the third air cylinder 5 is restarted.
3, the output shaft 53a is extended, the softening member 54 is lowered, and the tip 55 is separated from the inner surface of the central upper surface edge portion 21. Then, the second air cylinder 40 is activated and the output shaft 40a is extended. The arm 52 is moved to the right and the softening member 5 is moved.
4 is moved rightward and its tip 55 is separated from the gap between the central upper surface edge portion 21 and the web 7, the first air cylinder 34 is subsequently actuated and the output shaft 34a is extended so that the bending substrate 35 is pivoted. Bending substrate 3 pivoted around 37 as a fulcrum
5 or the surface of the bending member 38 facing the central upper surface edge portion 21 presses the central upper surface edge portion 21, whereby the softening member 5
The central upper surface edge portion 21 is bent around the V groove formed by melting by the tip 55 of the No. 4 fulcrum, and finally, as shown in FIG. 9, when the bending substrate 35 is pivoted 90 degrees, it is bent into a desired shape.

At this time, when the bending base plate 35 is pivoted by a predetermined amount, the flange 39 presses the end face of the central upper surface edge portion 21 to align the end face with the end face of the web 7. This allows
The center of the mounting hole 5 and the center of the arc portion of the U-shaped cutout hole 8a are aligned. With such a structure, there is an effect that the center of the mounting hole 5 can be aligned with the center of the arc portion of the U-shaped cutout hole 8a by a simple operation of pivoting the flange 39 via the bending board 35.

Even if the flange 39 is formed in a rod shape so that the tip of the rod enters the mounting hole while the bending substrate 35 pivots by a predetermined amount, the same action and effect as described above can be achieved.

Since it takes only a few seconds from when the tip 55 of the softening member 54 begins to separate from the inner surface of the central upper surface edge portion 21 until the bending substrate 35 completes pivoting, the tip 5
The surface of the V groove formed by being melted in No. 5 is still in a molten state, and the bent surface is welded to the opposing surface of the V groove.

Then, the first air cylinder 34 is operated again to contract the output shaft 34a to restore the bent substrate 35, and then the robot arm is moved based on the program taught in advance.
The bending device 30 is moved to a predetermined standby position to stand by for the next work. Then, the bumper fascia 1 is taken out from the jig by an appropriate means to obtain the bumper fascia 1 with the central upper surface edge portion 21 reinforced.

[0043]

[Fifth Embodiment] In the fifth embodiment, an integral hinge integrally formed at an edge of a central upper surface of a bumper fascia is bent, and a bending piece connected to the integral hinge is applied to the central upper surface of the bumper fascia. A device for contacting to form a hollow closed cross section on the central upper surface of the bumper fascia,
It is used when forming a hollow closed cross section on the upper central surface of the bumper fascia of FIG. 6 (A). That is, FIGS.
In FIG. 11, a bending device 60 has a base portion 62 formed with a connecting portion 61 connected to another driving device such as a robot, and a first air cylinder 64 is provided on a base portion 62 separated from the connecting portion 61 via a pivot 63. When the output shaft 64a of the air cylinder 64 is connected to the bending substrate 65 via the pivot shaft 66 and the output shaft 64a expands and contracts by the operation of the first air cylinder 64, the base 62 and the bending substrate 65 are connected. The bending base plate 65 is configured to pivot about a pivot shaft 67 that pivotally attaches and.

On the upper left end surface of the bending board 65, a bending member 68 having an L-shaped cross section and having a length substantially equal to the longitudinal length of the bending piece 42 is integrally attached along the longitudinal direction of the bending piece 42. An extending portion 68a extending upward is provided at an upper portion of 68 at a suitable distance in the longitudinal direction of the bending member 68 so as to project.
A flange 69 is attached to the extension portion 68a such that the position thereof can be adjusted in the axial direction of the extension portion 68a.

On the lower left end surface of the bending base plate 65, a receiving portion 70, which has substantially the same length as the length of the bending piece 42 in the longitudinal direction and extends substantially parallel to the central upper surface of the bumper fascia, is provided so as to cooperate with the bending member 68. The integral hinge 3 is bent.

The operation of the structure of the fifth embodiment will be described. The bumper fascia 1 is shown in a sectional view separated from the mounting hole 5 in FIG. 6A in the longitudinal direction of the central upper surface edge portion 22 (the direction perpendicular to the paper surface), and the claw 71 is provided inside the tip portion of the bent piece 42. On the other hand, a rib 72 is projected on the central upper surface and a jaw portion 73 is formed at the tip of the rib 72 so that the claw 71 and the jaw portion 73 can be engaged with each other. After opening the central upper edge 22 of the fascia 1 and holding the bumper fascia 1 at a predetermined position of a jig (not shown), for example, it is detachably connected to the arm tip of a robot (not shown) via a connecting portion 61. Bending device 6
When the bending base plate 65 of 0 is pivoted 90 degrees toward the central upper surface side, as shown in FIG.
The bending device 60 attached to the tip of the robot arm is brought close to the bumper fascia 1 as shown in FIG. The facia is brought into contact with the lower surface of the central upper surface.

Next, when the first air cylinder 64 is operated, the output shaft 64a is extended and the bending substrate 65 is moved to the pivot shaft 67.
When it is pivoted about the fulcrum, the integral hinge 3 having the smallest thickness and the weakest strength is bent to bend the bent piece 42.
Is pivoted with the integral hinge 3 as a fulcrum, and when the bending board 65 is pivoted 90 degrees, the claw 71 and the jaw 73 are pivoted.
And are engaged with each other to form a hollow closed cross-section portion having a square cross-section on the central upper surface of the bumper fascia 1.

Next, the first air cylinder 64 is operated again to contract the output shaft 64a to restore the bent substrate 65, and then the robot arm is moved based on the program taught in advance.
The bending device 60 is moved to a predetermined standby position to stand by for the next work, and the bumper fascia 1 is taken out as in the above-described embodiment.

[0049]

As described above, according to the bumper fascia reinforcement method and apparatus according to the present invention, the "U" -shaped cross section or the "B" -shaped cross section of the edge exerts the reinforcing effect. Therefore, the rigidity of the upper surface of the bumper fascia having the "U" -shaped cross section or the "B" -shaped cross section is significantly improved. In addition, when the secondary core after injection molding is used to form and reinforce a "U" -shaped or "B" -shaped cross section at the edge of the bumper fascia, it is possible to eliminate the undercut portion and eliminate the slide core. Even if the undercut portion cannot be removed, the structure of the slide core becomes simple. Especially, it is not necessary to force the undercut portion with the slide core. For this reason, not only the mold structure can be simplified and the mold manufacturing cost can be reduced, but also it is not necessary to forcibly remove the bumper fascia from the mold, so the shape accuracy of the bumper fascia is improved. Furthermore, since the bending line can be automatically bent by the device, human work can be eliminated from the bending work of the bending line. In particular, since the device for bending the bending line after melting and softening the bending line can bend any plastic as long as it is a thermoplastic, it is easy to use a thermoplastic bumper fascia for the edge portion. Can be reinforced by forming a "U" shaped cross section or a "B" shaped cross section.

[Brief description of drawings]

1 shows a first embodiment of the present invention, (A) is a perspective view of a bumper fascia manufactured by the method according to the present invention, (B) is a sectional view taken along line D-D of FIG. .

FIG. 2 is a sectional view of a main part of an injection mold for molding the bumper fascia shown in FIG.

FIG. 3 is an explanatory view showing a step of reinforcing bumper fascia by the method of the first embodiment of the present invention.

4A and 4B show a second embodiment of the present invention, FIG. 4A is an enlarged cross-sectional view of a main part of an injection molding die showing a reinforcement portion of a bumper fascia by the method according to the present invention, and FIG. Explanatory drawing which shows the reinforcement process of bumper fascia.

FIG. 5 is an explanatory view showing a step of reinforcing bumper fascia by the method of the third embodiment of the present invention.

FIG. 6 is a sectional view of a principal part showing four kinds of other embodiment examples of the reinforcing method by the method of the first embodiment of the present invention.

FIG. 7 is a cross-sectional view of essential parts showing three types of other embodiment examples of the reinforcing method by the method of the second embodiment of the present invention.

FIG. 8 is a cross-sectional view of the essential parts showing the first embodiment of the bending device according to the present invention.

FIG. 9 is a cross-sectional view of an essential part for explaining the operation of the bending device according to the first embodiment.

FIG. 10 is a cross-sectional view of a main part showing a second embodiment of the bending device according to the present invention.

FIG. 11 is a cross-sectional view of an essential part illustrating the operation of the bending device according to the second embodiment.

[Explanation of reference numerals] 1 bumper fascia 2 central upper edge 3 integral hinge 4 bent piece 5 mounting hole 6 rib 7 web 8 hole 8a cutout hole 9 hollow portion 10 injection molding die 11 fixed die 12 movable die 13 slide core 13a Hole 14 Extrusion pin 15 Extrusion plate 16 Inclined pin 19 Reinforcing rib 21,22,25 Central upper edge 41,42,43,44,45,72a, 73a Bending piece 71,72,73 Rib 30,60 Bending device 31 , 61 Connection part 32, 62 Base part 33, 63 Axis 34, 64 1st
Air cylinder 35,65 Bending substrate 36,66 Pivot 37,67 Pivot 38,68 Bending member 38a, 68a Extension 39,69 Flange 40 Second air cylinder 50 Guide member 51 Guide hole 52 Arm 53 Third air cylinder 54 Softening member 55 Tip of softening member 70 Receiving part

Claims (5)

[Claims] 1. A method for reinforcing a bumper fascia of a thermoplastic resin bumper for an automobile, comprising an integral hinge integrally formed on a peripheral edge portion of a product or a rib standing upright adjacent to the edge portion. When bending, the tip of the bent piece on the free tip side of the integral hinge is polymerized with the outer peripheral edge of the product that does not bend or with the rib to form a hollow cross-section, so that it is connected to the automobile body via the polymerized portion. Reinforcement method for bumper fascia characterized by 2. A method for reinforcing a bumper fascia of a thermoplastic resin bumper for an automobile, wherein a tip end side of a rib provided upright on an outer peripheral edge portion of the product or adjacent to the edge portion is melted.
The invention is characterized in that it is softened and bent, and a tip end of the bent piece is polymerized with an outer peripheral edge of the product which is not bent or the rib to form a hollow cross-section, and the hollow cross-section is connected to the automobile body through the polymerized portion. How to reinforce bumper fascia 3. A method for reinforcing a bumper fascia of a thermoplastic resin bumper for an automobile, wherein an L-shaped piece integrally formed on an outer peripheral edge of a product is melted and softened and bent.
Reinforcing method for bumper fascia, characterized by forming U-shaped cross section 4. An extension having a product outer peripheral edge portion and a rib standing adjacent to the edge portion and extending toward the end edge side through a bending line formed on the outer peripheral edge portion or the rib. A jig capable of supporting a thermoplastics product having a portion at a predetermined position, and a thermoplastic resin product supported by the jig, which is movable toward and away from the thermoplastics product and abuts on the extension portion to pivot the extension portion. And a bending device having bending means for bending to the outer peripheral edge of the product in which the bending line is not formed by moving or a rib standing upright adjacent to the outer peripheral edge. 5. A jig capable of supporting a thermoplastics product at a predetermined position, and a required portion of the thermoplastics product which is movable toward and away from the thermoplastics product supported by the jig. -Shaped softening means, means for moving the softening means close to and away from the required portion of the thermoplastics product, and the plastic product on the edge side of the portion softened by the softening means can be bent to bend the softened portion. A bending device having a bending means having a bending member.