JP3769799B2 - Weather strip processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a weather strip for an automobile having a trim portion and a hollow seal portion, and particularly relates to a method for processing a corner portion and a terminal portion of the weather strip.
[0002]
[Prior art]
As shown in FIG. 10, the weather strip 50 attached to the periphery of the door opening 21 of the automobile 20 is provided with a trim portion 51 having a substantially U-shaped cross section and the trim portion 51, as shown in FIGS. 11 to 16. After the extrusion molding 53 having the loop-shaped hollow seal portion 52 to which the loop ends 52a and 52b are fixed is extruded, the corner portion and the terminal portion of the extrusion molding 53 are processed and completed.
[0003]
In the corner part C of the extrusion-molded body 53 to be bent along the corner part at the periphery of the door opening 21, as shown in FIG. 11, a radius connecting the virtual bending center (not shown) and the corner part C when bent. The outer peripheral portion 52d of the hollow seal portion 52 on the outer peripheral side is cut away, leaving the inner peripheral portion 52c of the hollow seal portion 52 on the inner peripheral side in the direction. The corner portion C of the extruded molded body 53 is bent and set in a mold molding apparatus (not shown). As shown in FIGS. 12, 13, and 14, a mold molding portion 54 that replaces the cut outer peripheral portion 52d is molded. Simultaneously with the molding, the mold is connected to the inner peripheral portion 52c where the mold molding portion 54 is left.
[0004]
In the terminal portion T of the extruded molded body 53, as shown in FIG. 15A, the adhesive 55 is injected from the most terminal opening of the hollow seal portion 52 to the facing surface between the hollow seal portion 52 and the trim portion 51. After the application, as shown in FIGS. 15 (b) and 16, the hollow seal portion 52 is crushed toward the trim portion 51 and bonded by the adhesive 55. Since the crushed hollow seal portion 52 spreads symmetrically and protrudes from both edges of the trim portion 51 to both sides, the protruding portions 52e and 52f on both sides are cut off.
[0005]
[Problems to be solved by the invention]
However, the conventional weather strip 50 has the following problems.
When the corner portion C of the extruded body 53 is bent and set in the mold forming apparatus, the inner peripheral portion 52c of the hollow seal portion 52 that remains is shrunk by bending, and therefore, as shown in FIG.皺 56 was likely to occur. This ridge 56 has a problem that it deteriorates the appearance and reduces the sealing performance.
If the hollow seal portion 52 of the corner portion C is completely cut out without leaving the inner peripheral portion 52c and all of the hollow seal portion 52 is replaced by molding, the problem of the flange 56 does not occur. Becomes complicated and impractical.
[0006]
Further, when the hollow seal portion 52 is crushed to the trim portion 51 side at the end portion T of the extruded molded body 53, the loop ends 52a and 52b fall in opposite directions as shown in FIGS. 15 (b) and 16. The upper portion of the hollow seal portion 52 is folded over at the collapsed portion. For this reason, even if the protruding portions 52e and 52f are cut off after that, the crushed hollow seal portion 52 has a single portion and a double portion due to the folding, and a step 57 is generated at the boundary between the two portions. . And especially the level | step difference 57 which generate | occur | produced in the inner peripheral side of the weatherstrip 50 has a malfunction which worsens appearance because it is conspicuous. In addition, since the protruding portions 52e and 52f always occur at two places, the labor for excision also takes two places.
[0007]
Therefore, an object of the present invention is to prevent the occurrence of wrinkles in the inner peripheral portion of the hollow seal portion when bending the corner portion of the extruded molded body, or to trim the hollow seal portion at the end portion of the extruded molded body. An object of the present invention is to provide a method for processing a weather strip that can reduce the trouble of cutting off the protruding portion of the hollow seal portion when crushing to the side.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention of claim 1 , a cross-sectional loop shape in which a loop portion having a substantially U-shaped cross section composed of a pair of side walls and a connecting wall, and both ends of the loop are fixed to one side wall of the trim portion. In the method for processing the end portion of the weather strip, the side wall of the trim portion is extruded at an end portion of the extrusion-molded body, and the hollow seal portion is crushed toward the trim portion side. In the natural state before crushing the hollow seal part to the trim part side, the direction from the opening edge to the connecting wall is the A direction, and the direction from the connecting wall to the opening edge of the side wall is the B direction. The one side part of the hollow seal part protrudes in the direction A from the outer surface of the connecting wall, and before the hollow seal part is crushed to the trim part side, the part near the other loop end of the hollow seal part were excised, After applying an adhesive to the facing surfaces of the hollow seal portion and the trim portion, the hollow seal portion is pressed in the B direction and brought close to the trim portion side. By bonding with an adhesive, the hollow seal portion after being crushed is prevented from protruding in the direction A from the outer surface of the connecting wall.
[0011]
According to a second aspect of the present invention, there is provided a substantially U-shaped trim portion having a pair of side walls and a connecting wall, and a loop-shaped hollow seal portion having loop ends fixed to one side wall of the trim portion. In a weather strip end portion processing method in which an extruded molded body provided is extruded and a hollow seal portion is crushed toward the trim portion at the end portion of the extruded molded body, a connecting wall extends from an opening edge of the side wall of the trim portion. In the natural state before the hollow seal portion is crushed to the trim portion side, the direction toward the direction A is the direction A, and conversely the direction from the connecting wall toward the opening edge of the side wall is the direction B. One side portion protrudes from the outer surface of the connecting wall in the A direction, and after applying an adhesive to the facing surface of the hollow seal portion and the trim portion, the hollow seal portion is pressed in the B direction State the hollow By adhering by the adhesive crushed Lumpur unit to the trim side, as hollow seal portion after crushing does not protrude from the outer surface of the connecting wall to the A direction, trim hollow seal portion unit after crushing the side, it is characterized by excising only the protruding portion of the hollow seal portion that protrudes from the opening edge of the side wall of the trim part.
[0012]
In each of the above inventions, examples of the “weather strip” include various weather strips that are attached to the opening and closing portions of the automobile such as a door opening, a door panel, an engine hood, and a trunk.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a weather strip embodying the present invention will be described with reference to the drawings. As shown in FIGS. 10 and 4, the weather strip 1 of the present embodiment is attached to the upper half of the periphery of the door opening 21 of the automobile 20 and seals between the door sash 23. It is.
[0014]
In order to manufacture the weather strip 1, first, as shown in FIG. 1, a trim section 2 having a substantially U-shaped section and a loop-shaped hollow seal having loop ends 3 a and 3 b fixed to the trim section 2. An extruded body 4 having a portion 3 is extruded (although it is already bent in FIG. 1, it is of course extruded straight). As shown in FIG. 4, the trim portion 2 is extruded from an EPDM solid rubber material, and a reinforcing insert 5 is embedded at that time. The reinforcing insert 5 is formed by pressing a sheet metal into a substantially fence shape and then bending it into a substantially U-shaped cross section. A plurality of protruding holding lips 6 are formed on the inner surface of one side wall 2a of the trim portion 2 and a tongue-shaped holding lip 7 is formed on the inner surface of the other side wall 2b. The hollow seal portion 3 is coextruded simultaneously with the trim portion 2 using an EPDM sponge rubber material.
[0015]
As shown in FIG. 4, the trim portion 2 is attached to the body flange 22 such that the body flange 22 of the door opening 21 is sandwiched between the holding lips 6 and 7. The hollow seal portion 3 receives the contact of the door sash 23 when the door is closed, and seals between the door and the body.
[0016]
Next, as shown in FIGS. 1 and 10, at the corner portion C of the extruded body 4 to be bent along the periphery of the door opening 21, the inner peripheral portion of the hollow seal portion 3 that becomes the inner peripheral side when bent. 3c is left and the outer peripheral part 3d of the hollow seal part 3 used as an outer peripheral side is excised from 50-100 mm in length, for example. In the natural state after this excision, the remaining inner peripheral portion 3 c protrudes from the connecting wall 2 c of the trim portion 2 toward the inner peripheral side.
[0017]
The corner part C of the extrusion-molded body 4 is bent and set in a mold molding apparatus (not shown) including a split mold, a core, and the like. At this time, the remaining inner peripheral portion 3c of the hollow seal portion 3 is moved to the vicinity of the neutral surface N in terms of material mechanics which does not expand or contract by bending or to the outer peripheral side from the neutral surface N, and is held in that state. . Here, even if the connecting wall 2c of the trim part 2 is bent, the rigidity of the reinforcing insert 5 is effective and hardly expands or contracts. However, the side walls 2a, 2b of the trim part 2 are substantially in the shape of a fence of the reinforcing insert 5 when bent. Elongation occurs because each element is divided and rigidity does not work. Therefore, the neutral surface N exists on substantially the same plane as the connecting wall 2c, and the inner peripheral portion 3c is brought close to the connecting wall 2c as a guide.
[0018]
EPDM sponge rubber material is injected into the mold forming device, and as shown in FIGS. 2, 3 and 4, the mold forming portion 8 is replaced with the outer peripheral portion 3d of the excised hollow seal portion 3, and at the same time, The mold forming part 8 is connected to the inner peripheral part 3c of the hollow seal part 3 where the mold forming part 8 is left. The cross-sectional shape of the molded part 8 is substantially the same as the outer peripheral part 3d of the hollow seal part 3 cut off at the end, but the outer peripheral side is squared so as to match the corner shape of the door sash at the center part. The angular part is opened away from the trim part 2 on the back side.
[0019]
As described above, in the state where the inner peripheral portion 3c of the hollow seal portion 3 is brought close to the neutral surface N or toward the outer peripheral side from the neutral surface N, the mold forming portion 8 is molded and the inner peripheral portion 3c is mold-molded. By connecting, wrinkles can be prevented from occurring in the inner peripheral portion 3c, and appearance deterioration or sealing performance deterioration due to wrinkles does not occur.
[0020]
Next, at the terminal portion T of the extruded molded body 4, as shown in FIGS. 5 (a) and 5 (b), a portion 3e in the vicinity of the loop end 3b of the hollow seal portion 3 is excised and confronted with the excised portion. For example, a cyanoacrylate adhesive 9 is applied to at least one of the inner surface of the hollow seal portion 3 and the outer surface of the side wall 2 a of the trim portion 2.
[0021]
As shown in FIGS. 6 and 7, the lower die 11 and the upper die 12 are pivotally attached by a hinge 13, and the collapsing die 15 consisting of the separable lower die 16 and the upper die 17 is divided into the latter. Are provided adjacent to each other so that they are located at the most end side of the extruded molded body 4, and the trim portion 2 is fitted to the thin plate portions 14 and 18 of the lower molds 11 and 16. The terminal part T is set. Then, by lowering the upper mold 12 of the closing mold 10, the hollow seal portion 3 is moved in the same direction so that one loop end 3a is tilted toward the other loop end 3b. Note that the outermost end of the hollow seal portion 3 from which the neighboring portion 3e has been cut off is applied only to the crushing die 15, and the inner portion of the hollow seal portion 3 that has not been cut off is applied to the gathering die 10. In this state, by lowering the upper mold 17 of the crushing mold 15, as shown in FIG. 5C and FIG. 8, the outermost end of the hollow seal part 3 is crushed toward the trim part 2, and the adhesive 9 Glue. At this time, the cutting edge of the hollow seal portion 3 is exactly coincident with the opening edge of the side wall 2a of the trim portion 2 by cutting the vicinity portion 3e.
[0022]
As described above, push the outermost end of the hollow seal portion 3 toward the trim portion 2 while the hollow seal portion 3 is moved in the same direction so that one loop end 3a is tilted toward the other loop end 3b. Since it is crushed, the hollow seal portion 3 in the vicinity of the loop end 3a becomes a beautiful single layer, and a step difference as in the conventional case does not occur. The vicinity of the loop end 3a is on the inner peripheral side of the weather strip 50 and is easily noticeable. However, since the step can be eliminated, deterioration of appearance can be prevented. Further, by cutting away the vicinity 3e, the hollow seal portion 3 near the other loop end 3b is also unified, and no step is generated.
[0023]
Further, since the hollow seal portion 3 does not protrude from both edges of the trim portion 51 when the hollow seal portion 3 is crushed due to the close-up of the hollow seal portion 3 and the removal of the neighboring portion 3e, the subsequent protrusion portion is not necessary to be cut off. become. Therefore, the labor of excision at the terminal portion T is only required to be excised once in the vicinity 3e.
[0024]
Next, FIG. 9 shows a modified example of a method for processing the terminal portion T of the extruded molded body 4. In this modified example, as shown in FIG. 9A, the hollow seal portion 3 and the trim portion 2 are separated from the most terminal opening of the hollow seal portion 3 in a state where no part of the hollow seal portion 3 of the terminal portion T is excised. Adhesive 9 is injected and applied to the opposite surface. Then, as in the above-described embodiment, the hollow seal portion 3 is brought into a close state, and the end of the hollow seal portion 3 is crushed toward the trim portion 2 as shown in FIG. Adhere by.
[0025]
When the hollow seal portion 3 is crushed, it does not protrude from the connecting wall 2c of the trim portion 2, but protrudes from the opening edge of the side wall 2a of the trim portion 2, so that the protruding portion 3f is cut off. Therefore, the labor for excision at the terminal portion T is only required to be excised once for the protruding portion 3f.
[0026]
Even in this modified example, the hollow seal portion 3 in the vicinity of the loop end 3a becomes a beautiful single layer, and a step difference as in the conventional case does not occur. The hollow seal portion 3 in the vicinity of the other loop end 3b is doubled and a step 19 is generated. However, since the step at this position is not easily noticeable, there is no problem.
[0027]
In addition, this invention is not limited to the said embodiment, It is also possible to implement suitably changing as follows.
(1) The above-mentioned processing is performed on a corner portion different from the above-described embodiment of the weather strip.
(2) The present invention is applied to weather strips mounted on automobile door panels, engine hoods, trunks, and the like. And the specific shape of a trim part and a hollow seal part is changed according to the said mounting location.
[0029]
【The invention's effect】
As described in detail above , according to the weather strip terminal part processing method according to the first and second aspects of the invention, when the hollow seal part is crushed to the trim part side at the terminal part of the extruded molded body, the terminal is processed. It is possible to reduce the trouble of excising the protruding portion of the hollow seal portion at the site.
[Brief description of the drawings]
FIG. 1 is a plan view of a weather strip according to an embodiment of the present invention when an outer peripheral portion of a hollow seal portion is cut off and an extruded product is bent at a corner portion.
FIG. 2 is a plan view when a molded part is molded and connected to the extruded molded body.
FIG. 3 is a perspective view of the extruded product and the molded part as viewed from the inner peripheral side.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a cross-sectional view showing a method for processing a terminal portion of the extruded product.
FIG. 6 is a perspective view showing a method for processing a terminal portion of the extruded product.
FIG. 7 is a cross-sectional view showing how to move the hollow seal part in the processing method.
FIG. 8 is a perspective view showing a terminal portion of the extruded product after the processing.
FIG. 9 is a cross-sectional view showing a modified example of a method for processing the terminal portion.
FIG. 10 is a side view of an automobile showing a place where a weather strip is attached.
FIG. 11 is a plan view of the conventional weather strip when the outer peripheral portion of the hollow seal portion is cut and the extruded product is bent at a corner portion.
FIG. 12 is a plan view when a molding part is molded and connected to the extruded molded body.
FIG. 13 is a perspective view of the extruded product and the molded part as seen from the inner peripheral side.
14 is a cross-sectional view taken along line XIV-XIV in FIG.
FIG. 15 is a cross-sectional view showing a method for processing the end portion of the extruded product.
FIG. 16 is a perspective view showing a terminal portion of the extruded product after the processing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Weather strip 2 Trim part 3 Hollow seal part 3a One loop end 3b The other loop end 3c Inner peripheral part 3d Outer peripheral part 3e The vicinity part of the other loop end 4 Extrusion body 8 Molding part 20 Automobile 21 Door opening part C Corner part T Terminal part N Neutral surface

Claims (2)

A trim part (2) having a substantially U-shaped cross section composed of a pair of side walls (2a, 2b) and a connecting wall (2c), and one end (3a, 3b) on one side wall (2a) of the trim part (2) The extruded molded body (4) having a loop-shaped hollow seal portion (3) to which is fixed is extruded, and the hollow seal portion (3) is formed at the end portion (T) of the extruded molded body (4). ) In the weather strip end portion processing method of crushing to the trim part (2) side,
The direction from the opening edge of the side wall (2a) of the trim part (2) toward the connecting wall (2c) is defined as A direction, and conversely, the direction from the connecting wall (2c) toward the opening edge of the side wall (2a) is defined as B. Direction,
In a natural state before the hollow seal portion (3) is crushed toward the trim portion (2), one side portion of the hollow seal portion (3) protrudes in the direction A from the outer surface of the connecting wall (2c). And
Before crushing the hollow seal portion (3) to the trim portion (2) side, a portion (3e) in the vicinity of the other loop end (3b) of the hollow seal portion (3) is cut off,
After applying an adhesive (9) to the facing surfaces of the hollow seal portion (3) and the trim portion (2),
By pressing the hollow seal portion (3) in the B direction and pressing the hollow seal portion (3) toward the trim portion (2) and bonding with the adhesive (9), A weather strip terminal portion machining method, wherein the hollow seal portion (3) after being crushed is prevented from protruding in the direction A from the outer surface of the connecting wall (2c). A trim part (2) having a substantially U-shaped cross section composed of a pair of side walls (2a, 2b) and a connecting wall (2c), and one end (3a, 3b) on one side wall (2a) of the trim part (2) The extruded molded body (4) having a loop-shaped hollow seal portion (3) to which is fixed is extruded, and the hollow seal portion (3) is formed at the end portion (T) of the extruded molded body (4). ) In the weather strip end portion processing method of crushing to the trim part (2) side,
The direction from the opening edge of the side wall (2a) of the trim part (2) toward the connecting wall (2c) is defined as A direction, and conversely, the direction from the connecting wall (2c) toward the opening edge of the side wall (2a) is defined as B. Direction,
In a natural state before the hollow seal portion (3) is crushed toward the trim portion (2), one side portion of the hollow seal portion (3) protrudes in the direction A from the outer surface of the connecting wall (2c). And
After applying an adhesive (9) to the facing surfaces of the hollow seal portion (3) and the trim portion (2),
By pressing the hollow seal portion (3) in the B direction and pressing the hollow seal portion (3) toward the trim portion (2) and bonding with the adhesive (9), The hollow seal portion (3) after being crushed should not protrude from the outer surface of the connecting wall (2c) in the direction A ,
After crushing the hollow seal portion (3) toward the trim portion (2), only the protruding portion of the hollow seal portion (3) protruding from the opening edge of the side wall (2a) of the trim portion (2) A method for processing an end portion of a weather strip, comprising cutting out.

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