JPH09183171A - Weather strip processing method - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To prevent wrinkles from being generated in the inner peripheral portion of a hollow seal portion when bending a corner portion of an extruded product,
When the hollow seal portion is crushed toward the trim portion at the end portion of the extruded body, it is possible to prevent a step from being generated in the hollow seal portion and improve the appearance of the weather strip. SOLUTION: An extruded body 4 having a trim portion 2 and a hollow seal portion 3 is extruded, and at a corner portion C, an outer peripheral portion 3d of the hollow seal portion 3 is cut off while leaving an inner peripheral portion 3c. When the corner portion C of the extruded body 4 is bent and set in the mold forming device, the remaining inner peripheral portion 3c is moved to the vicinity of the neutral surface N on the material mechanics that does not expand or contract by bending, or the neutral surface. Move closer to the outer circumference. In this state, at the same time as the die forming portion that replaces the cut outer peripheral portion 3d is die formed, the die forming portion is connected to the inner peripheral portion 3c where the die forming portion remains.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip for a vehicle having a trim portion and a hollow seal portion,
In particular, it relates to a method for processing a corner portion and a terminal portion of a weather strip.

[0002]

2. Description of the Related Art As shown in FIG. 10, a weather strip 50 mounted on the periphery of a door opening 21 of an automobile 20 is
As shown in FIGS. 11 to 16, an extruded body 53 including a trim portion 51 having a substantially U-shaped cross section and a hollow seal portion 52 having a loop-shaped cross section in which both loop ends 52a and 52b are fixed to the trim portion 51. After extrusion molding, the corner portion and the end portion of the extrusion molded body 53 are processed to complete the process.

In a corner portion C of the extruded body 53 which is to be bent along the corner portion of the peripheral edge of the door opening 21, the corner portion C shown in FIG.
As shown in 1, when bent, a virtual bending center (not shown)
The outer peripheral portion 52d of the hollow seal portion 52 on the outer peripheral side is cut off, leaving the inner peripheral portion 52c of the hollow seal portion 52 on the inner peripheral side in the radial direction connecting the corner portion C and the corner portion C. The corner portion C of the extruded body 53 is bent and set in a die forming device (not shown), and as shown in FIGS. 12, 13 and 14, a die forming portion 54 that replaces the cut outer peripheral portion 52d is formed. Simultaneously with the molding, a mold is connected to the inner peripheral portion 52c where the mold forming portion 54 is left.

At the end portion T of the extruded body 53, as shown in FIG.
As shown in FIG. 15 (a), the adhesive 55 is injected and applied from the outermost end opening of the hollow seal part 52 to the facing surface of the hollow seal part 52 and the trim part 51, and then FIG. 1
As shown in FIG. 6, the hollow seal portion 52 is crushed toward the trim portion 51 side and adhered by the adhesive 55. The crushed hollow seal portion 52 spreads symmetrically and protrudes from both edges of the trim portion 51 to both sides.
2e and 52f are cut off.

[0005]

However, the conventional weather strip 50 has the following problems. The inner peripheral portion 5 of the hollow seal portion 52 left when the corner portion C of the extruded body 53 is bent and set in the molding apparatus.
Since 2c contracts by bending, as shown in FIG. 13, wrinkles 56 are likely to occur on the inner peripheral portion 52c. This wrinkle 56
Had a problem that the appearance was deteriorated and the sealing property was deteriorated. If the hollow seal portion 52 of the corner portion C is entirely cut off without leaving the inner peripheral portion 52c and replaced by molding, the wrinkles 56 can be formed.
However, the mold structure becomes complicated and it is not practical.

Further, when the hollow seal portion 52 is crushed toward the trim portion 51 at the end portion T of the extruded body 53, as shown in FIG.
As shown in (b) and FIG. 16, both loop ends 52a, 5
2b are inclined and spread in opposite directions, and the upper portion of the hollow seal portion 52 is folded and overlapped with the inclined portion. Therefore, even if the protruding portions 52e and 52f are cut off thereafter,
The crushed hollow seal portion 52 has a single portion and a double portion due to the folding, and a step 5 is formed at the boundary between the two portions.
7 occurs. In particular, the step 57 generated on the inner peripheral side of the weather strip 50 is easily noticeable, so that there is a problem that the appearance is deteriorated. Also, the protruding portion 52
Since e and 52f are always generated in two places, the time and labor for excision also took two places.

Therefore, an object of the present invention is to prevent wrinkles from being generated in the inner peripheral portion of the hollow seal portion when the corner portion of the extrusion molded body is bent, and to prevent the hollow seal portion at the end portion of the extrusion molded body. It is an object of the present invention to provide a weather strip processing method capable of preventing a step from being generated in the hollow seal portion when squeezing the sheet to the trim portion side and improving the appearance.

[0008]

In order to solve the above-mentioned problems, in the invention of claim 1, extrusion molding is provided with a trim portion and a hollow seal portion having a loop-shaped cross section in which both ends of the loop are fixed to the trim portion. The body is extruded, and at the corner portion of the extruded body that should be bent along the corner portion of the mounting location such as the periphery of the door opening of the automobile, the inner peripheral portion of the hollow seal portion that becomes the inner peripheral side when bent is Remaining, the outer peripheral part of the hollow seal part that is the outer peripheral side is cut off, the corner part of the extrusion molded body is bent and set in the mold forming device, and the mold forming part that replaces the outer peripheral part of the cut hollow seal part is molded. At the same time
In a method for processing a corner portion of a weather strip for connecting a mold to an inner peripheral portion of a hollow seal portion where the mold forming portion is left, when the corner portion of the extruded body is bent and set in a mold forming apparatus, it is left. It is characterized in that the inner circumferential portion of the hollow seal portion set aside is brought close to the neutral surface of the material mechanics that does not expand or contract due to bending or toward the outer circumferential side from the neutral surface.

According to the second aspect of the present invention, an extruded body having a trim portion and a hollow seal portion having a loop-shaped cross section in which both ends of the loop are fixed to the trim portion is extruded, and the extruded body end is extruded. In the part, in the method of processing the end part of the weather strip where the hollow seal part is crushed toward the trim part side, one loop end of the loop ends is crushed toward the other loop end direction before the hollow seal part is crushed toward the trim part side. The feature is that the hollow seal part is moved in the same direction by tilting it down.

Further, in the invention of claim 2, before the hollow seal portion is crushed toward the trim portion side, a portion in the vicinity of the other loop end of the hollow seal portion is cut off, and the hollow seal portion and the trim are cut from the cut portion. An adhesive can be applied to the surface facing the part (claim 3).

Further, after the hollow seal portion is crushed toward the trim portion side, the protruding portion of the hollow seal portion protruding from one edge of the trim portion can be cut off (claim 4).

In each of the above inventions, examples of the "weather strip" include various weather strips that are mounted at opening and closing portions of an automobile such as a door opening, a door panel, an engine hood and a trunk.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a weather strip embodying the present invention will be described below 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 peripheral edge of the door opening 21 of the automobile 20 to seal the space between the weather strip 1 and the door sash 23. Is.

To manufacture this weather strip 1,
First, as shown in FIG. 1, an extruded body 4 including a trim portion 2 having a substantially U-shaped cross-section and a hollow seal portion 3 having a loop-shaped cross section in which loop ends 3a and 3b are fixed to the trim portion 2 is formed. Extrusion molding (already bent in FIG. 1, but of course extruded straight). As shown in FIG. 4, the trim portion 2 has an EPD.
Extrusion molding is performed using an M solid rubber material, and the 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 the sheet metal into a substantially U-shaped cross section. A plurality of convex holding lips 6 are simultaneously formed on the inner surface of one side wall 2a of the trim portion 2, and a tongue-shaped holding lip 7 is simultaneously formed on the inner surface of the other side wall 2b. Also,
The hollow seal part 3 is coextruded simultaneously with the trim part 2 using an EPDM sponge rubber material.

As shown in FIG. 4, the trim portion 2 is
The body flange 22 of the door opening 21 is sandwiched between the holding lips 6, 7 and is attached to the body flange 22. The hollow seal portion 3 receives the door sash 23 when the door is closed and seals between the door and the body.

Next, as shown in FIGS. 1 and 10, at the corner portion C of the extruded body 4 to be bent along the peripheral edge of the door opening 21, the hollow seal portion 3 which becomes the inner peripheral side when bent is formed. The outer peripheral portion 3d of the hollow seal portion 3 on the outer peripheral side is cut off over a length of, for example, 50 to 100 mm, leaving the inner peripheral portion 3c. In addition, in the natural state after this excision, the remaining inner peripheral portion 3c protrudes from the connecting wall 2c of the trim portion 2 toward the inner peripheral side.

Bending the corner portion C of the extruded body 4,
The mold is set in a mold forming device (not shown) including a split mold and a core. At this time, the remaining inner peripheral portion 3c of the hollow seal portion 3 is brought close to or closer to the neutral surface N on the material mechanics that does not expand and contract by bending, and is held in that state. . Here, the connecting wall 2c of the trim portion 2
Has a rigidity of the reinforcing insert 5 even when bent, and hardly expands or contracts, but the side walls 2a and 2b of the trim portion 2
When bent, each of the substantially fence-shaped elements of the reinforcing insert 5 is divided and the rigidity is not effective, so that elongation occurs. Therefore, the neutral plane N exists substantially on the same plane as the connecting wall 2c,
Using c as a guide, the inner peripheral portion 3c is brought closer as described above.

An EPDM sponge rubber material is injected into the molding apparatus to mold a molding section 8 which replaces the outer peripheral portion 3d of the cut hollow seal section 3 as shown in FIGS. 2, 3 and 4. At the same time, it is connected to the inner peripheral portion 3c of the hollow seal portion 3 where the mold forming portion 8 is left. The cross-sectional shape of the mold forming portion 8 is substantially the same as the outer peripheral portion 3d of the hollow seal portion 3 that is cut off at the end portion, but the outer peripheral side is angular at the central portion so as to match the corner shape of the door sash. The angular portion is open on the back side apart from the trim portion 2.

As described above, the inner peripheral portion 3c of the hollow seal portion 3 is molded near the neutral surface N or closer to the outer peripheral side of the neutral surface N, and the inner peripheral portion is formed by molding. By making a mold connection with 3c, it is possible to prevent wrinkles from being generated in the inner peripheral portion 3c, and the wrinkles do not deteriorate the appearance or the sealing performance.

Next, at the end portion T of the extruded 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 cut off, and from the cut portion, The inner surface of the hollow seal portion 3 and the side wall 2a of the trim portion 2 facing each other
A cyanoacrylate-based adhesive 9 is applied to at least one of the outer surfaces of the.

As shown in FIGS. 6 and 7, a lower mold 11 and an upper mold 12 are hinged to each other by a hinge 13, and a collapsing mold 15 is composed of a separable lower mold 16 and an upper mold 17. Are provided next to each other so that the latter is the endmost side of the extrusion molded body 4, and by fitting the trim portion 2 to the thin plate portions 14 and 18 of the lower molds 11 and 16, extrusion molding is performed on both open molds 10 and 15. The terminal part T of the body 4 is set. Then, by lowering the upper mold 12 of the gathering mold 10, one loop end 3
The hollow seal portion 3 is moved in the same direction by tilting a toward the other loop end 3b. The outermost end of the hollow seal portion 3 in which the neighboring portion 3e is cut off is applied only to the crushing die 15, and the shifting die 10 is applied to the inner portion of the hollow seal portion 3 which is not cut out. In this state, the upper mold 1 of the crushing mold 15
As shown in FIGS. 5 (c) and 8, the lowermost end of the hollow seal portion 3 is crushed toward the trim portion 2 side and is bonded by the adhesive agent 9, as shown in FIGS. At this time, the cutting edge of the hollow seal portion 3 exactly coincides with the opening edge of the side wall 2a of the trim portion 2 by cutting the neighboring portion 3e.

As described above, the hollow seal portion 3 is formed by tilting one loop end 3a toward the other loop end 3b.
Since the outermost end of the hollow seal portion 3 is crushed toward the trim portion 2 in the state in which the hollow seal portion 3 is moved in the same direction, the hollow seal portion 3 near the loop end 3a becomes a neat single layer, and a step like the conventional one does not occur. . The weather strip 5 is formed near the loop end 3a.
It is on the inner peripheral side of 0 and is easily noticeable, but since the step can be eliminated, deterioration of appearance can be prevented. Further, the hollow seal portion 3 in the vicinity of the other loop end 3b becomes a single layer by cutting off the neighboring portion 3e, and no step is generated.

Further, since the hollow seal portion 3 is pushed out and the neighboring portion 3e is cut off, the hollow seal portion 3 does not stick out from both edges of the trim portion 51 when it is crushed. Excision is unnecessary. Therefore, it is only necessary to cut the terminal portion T once to cut the neighboring portion 3e.

Next, FIG. 9 shows a modified example of the method of processing the end portion T of the extruded body 4. In this modified example,
As shown in FIG. 9A, the hollow seal portion 3 of the terminal portion T
The adhesive 9 is injected and applied from the most distal opening of the hollow seal portion 3 to the facing surface of the hollow seal portion 3 and the trim portion 2 in a state where no part of the hollow seal portion is cut off. Then, as in the above-described embodiment, the hollow seal portion 3 is brought to a closed state, and as shown in FIG. 9B, the outermost end of the hollow seal portion 3 is crushed to the trim portion 2 side and the adhesive 9 To adhere.

When the hollow seal portion 3 is crushed, it does not protrude from the connecting wall 2c of the trim portion 2, but the trim portion 2
Since it protrudes from the opening edge of the side wall 2a, the protruding portion 3f is cut off. Therefore, the time and effort for cutting at the terminal portion T need only be once for cutting the protruding portion 3f.

Also in this modified example, the hollow seal portion 3 near the loop end 3a becomes a neat single layer, and the conventional level difference does not occur. The hollow seal portion 3 near the other loop end 3b is doubled, and a step 19 is generated, but the step at this position is not noticeable and does not pose a problem.

The present invention is not limited to the above-mentioned embodiment, but can be implemented by appropriately changing as follows. (1) The above-mentioned processing is performed on a corner portion of the weather strip different from that of the above-mentioned embodiment. (2) The present invention is applied to an automobile door panel, an engine hood,
Applies to weather strips that are attached to trunks. Then, the specific shapes of the trim portion and the hollow seal portion should be changed according to the mounting location.

[0028]

As described in detail above, according to the method for processing a corner portion of a weather strip according to the invention of claim 1, when the corner portion of the extruded product is bent, the inner peripheral portion of the hollow seal portion is covered. Wrinkles can be prevented from occurring, and the appearance and sealing properties can be improved.

Further, according to the method for processing the end portion of the weather strip according to the inventions of claims 2 to 4, when the hollow seal portion is crushed toward the trim portion side at the end portion of the extrusion molded body, It is possible to prevent the occurrence of a step, improve the appearance, and reduce the labor of cutting the hollow seal portion at the end portion.

[Brief description of the drawings]

FIG. 1 is a plan view of a weather strip according to an embodiment of the present invention in which 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 molding portion is molded and connected to the extrusion molded body.

FIG. 3 is a perspective view of the extrusion-molded body and the mold-molded portion as viewed from the inner peripheral side.

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

FIG. 5 is a cross-sectional view showing a method for processing an end portion of the extrusion molded body.

FIG. 6 is a perspective view showing a method of processing an end portion of the extrusion molded body.

FIG. 7 is a cross-sectional view showing how to move a hollow seal portion in the same processing method.

FIG. 8 is a perspective view showing a terminal portion of the extruded body after the processing.

FIG. 9 is a cross-sectional view showing a modified example of the processing method of the terminal portion.

FIG. 10 is a side view of the automobile showing a mounting location of the weather strip.

FIG. 11 is a plan view of a weather strip of a conventional example in which an outer peripheral portion of a hollow seal portion is cut off and an extruded body is bent at a corner portion.

FIG. 12 is a plan view of the extrusion molded body when a molding portion is molded and connected.

FIG. 13 is a perspective view of the extruded body and the die-molded portion as viewed from the inner peripheral side.

14 is a sectional view taken along line XIV-XIV of FIG.

FIG. 15 is a cross-sectional view showing a method of processing an end portion of the extrusion molded body.

FIG. 16 is a perspective view showing a terminal portion of the extruded body after the processing.

[Explanation of symbols]

 1 Weather Strip 2 Trim Part 3 Hollow Seal Part 3a One Loop End 3b Other Loop End 3c Inner Part 3d Outer Part 3e Near End of Other Loop End 4 Extruded Body 8 Molded Part 20 Automobile 21 Door Opening C Corner part T Terminal part N Neutral surface

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29L 31:30

Claims (4)

[Claims] 1. An extruded body having a trim portion and a hollow seal portion having a loop-shaped cross section in which both ends of the loop are fixed to the trim portion is extruded, and a corner portion of a mounting portion such as a peripheral edge of a door opening of an automobile is extruded. At the corner portion of the extruded body to be bent along, the outer peripheral portion of the hollow seal portion which is the outer peripheral side is cut off while leaving the inner peripheral portion of the hollow seal portion which is the inner peripheral side when bent, The corner portion of the molded body is bent and set in a mold molding device, and at the same time, a mold molding portion that replaces the outer peripheral portion of the cut hollow seal portion is molded, and at the same time, the mold molding portion is left in the hollow seal portion. In a method for processing a corner portion of a weather strip to be die-connected to the inner peripheral portion, when bending the corner portion of the extruded body and setting it in a die molding apparatus, the inner peripheral portion of the hollow seal portion left is, Song Weatherstrip corner portion machining method, wherein a gather toward the outer periphery than near to or the neutral plane of the neutral plane of the strength of materials that do not expand or contract by. 2. An extrusion molded body comprising a trim part and a hollow seal part having a loop-shaped cross section in which both ends of the loop are fixed to the trim part is extruded, and the hollow seal part is formed at an end portion of the extrusion molded product. In the method of processing the end portion of the weather strip for crushing to the trim portion side, before crushing the hollow seal portion to the trim portion side, one loop end of each of the loop ends is tilted toward the other loop end. Then, the method for processing the end portion of the weather strip is characterized in that the hollow seal portion is moved in the same direction. 3. Before crushing the hollow seal part toward the trim part side, a part near the other loop end of the hollow seal part is cut off, and the cut part faces the hollow seal part and the trim part. The method for processing a terminal portion of a weather strip according to claim 2, wherein an adhesive is applied to the surface. 4. The end portion of the weather strip according to claim 2, wherein after the hollow seal portion is crushed toward the trim portion side, a protruding portion of the hollow seal portion protruding from one edge of the trim portion is cut off. Processing method.