JP2964392B2 - Manufacturing method of weather strip for automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a weather strip to be mounted on an automobile door.

[0002]

2. Description of the Related Art Generally, a weather strip mounted on an automobile door differs in the circumferential direction of almost all types of vehicles due to the relationship between the shape of a door opening of a vehicle body and the path of entry of the door into the opening. It has a cross-sectional shape.

For example, a door 2 of an automobile 1 shown in FIGS.
In the weather strip 100 to be mounted on the door 2, an upper edge portion of the door 2, that is, a rail region R disposed at a portion corresponding to a roof side rail of the vehicle body, and an upper rear edge portion of the door 2, that is, a center pillar or A pillar region P arranged at a portion corresponding to the rear pillar, and other peripheral portions of the door;
That is, the panel area N mainly arranged in the area of the door panel
8 are formed in different cross-sectional shapes as shown in FIG.

[0004] This weather strip 100 is shown in FIG.
(A) As shown in FIG.
And a hollow seal portion 1 extending from the mounting base 12 and abutting on a door opening 4 of the vehicle body.
4 and a lip 16 protruding from the mounting base 12 toward the door opening 4, and is usually made of sponge rubber.

[0005] The hollow seal portion 14 is laid down toward the mounting surface side of the door 2 in the panel region N shown in Fig. 8B, compared to the rail region R shown in Fig. 8A. In the pillar region P shown in FIG. 8C, the cross section is further laid down.

The lip 16 is shown in FIG.
The lip portion 16 is not formed in the panel region N shown in (b), and the protrusion length is shorter in the pillar region P shown in FIG. 8C than in the rail region R shown in FIG. Are formed in a cross-sectional shape bent near the notch 16a provided substantially at the center.

Conventionally, when manufacturing such a weather strip 100, each of the regions P, R, and N having different cross-sectional shapes is extruded, respectively, and then connected using a connection mold. I have.

[0008]

However, when each of the regions P, R, and N having different cross-sectional shapes is formed by extrusion, an extrusion die is required for each region. Connection 1 connecting them as shown
8, there are many connecting dies. for that reason,
There is a problem that the manufacturing cost increases. In addition, since there are many connection portions 18, there is a problem that the appearance is poor due to the steps, color differences and the like.

Accordingly, an object of the present invention is to provide a method of manufacturing a weather strip for an automobile, which can reduce the manufacturing cost and improve the appearance.

[0010]

According to a first aspect of the present invention, there is provided a method for manufacturing a weather strip for a vehicle, comprising: a mounting base mounted on a peripheral portion of a door of the vehicle; and a hollow seal extending from the mounting base. In the method of manufacturing a weather strip for an automobile, the weather strip is extruded from a product opening of an extrusion die, and a hollow seal portion of the extruded weather strip is supported in a predetermined posture during vulcanization. The support rubber to be extruded from the extrusion die, and in a predetermined region in the circumferential direction of the weather strip, the shape of the support rubber is gradually changed to gradually change the shape of the hollow seal portion. .

In this manufacturing method, the hollow seal portion of the weather strip extruded from the extrusion die is supported by a supporting rubber also extruded from the extrusion die in a predetermined posture at the time of vulcanization. It is formed into the shape of the time.
Then, the shape of the supporting rubber is gradually changed, that is, gradually changed in a predetermined region in the circumferential direction, and the shape of the hollow seal portion supported by the supporting rubber is gradually changed by the gradually changing shape. Since the shape of the hollow seal portion is gradually changed by the gradual change of the shape of the support rubber in this manner, the weather strip attached to the door peripheral portion and having the hollow seal portion having various cross-sectional shapes in the circumferential direction,
It can be manufactured with one extrusion die, and the number of connection parts can be reduced. Thereby, the manufacturing cost can be reduced, and the appearance can be improved.

The gradual change of the shape of the supporting rubber is performed by disposing a sliding member on the extrusion die and moving the sliding member to close at least a part of the extrusion opening of the supporting rubber. Can be.

According to a third aspect of the present invention, there is provided a method for manufacturing a weather strip for an automobile according to the first aspect, wherein the weather strip includes a lip portion projecting from the mounting base, and the predetermined circumferential direction is provided. In the region, the shape of the hollow seal portion is gradually changed, and the shape of the lip portion is gradually changed.

As described above, by gradually changing the lip portion protruding from the mounting base together with the gradual change of the hollow seal portion, it is possible to cope with a change in the cross-sectional shape of the lip portion in the circumferential direction at low cost and with good appearance. can do.

The gradual change in the shape of the lip portion may be due to a change in its protruding length or a change in its bending angle, and it is more preferable to combine both.

Here, the projecting length of the lip is gradually changed by disposing a second sliding member on the extrusion die and moving the second sliding member to form the lip forming hole of the product opening. At least partially.

In order to gradually change the bending angle of the lip, a notch is provided in the lip, and immediately after the lip is pushed, the vicinity of the notch is pressed by a pressing means such as a roller disposed in front of the extrusion die. Can be performed.

[0018]

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

The weather strip 10 for an automobile in this embodiment is the same as the conventional weather strip 100 described above.
Similarly, as shown in FIG. 1, the mounting base 12 includes a mounting base 12 attached to the periphery of the door, a hollow seal portion 14 extending from the mounting base 12, and a lip 16 protruding from the mounting base 12. The door 2 is mounted around the entire periphery of the door 2 and has different cross-sectional shapes of the rail region R, the pillar region P, and the panel region N in the circumferential direction.

In this embodiment, as shown in FIG. 1, gradually changing regions G1, G2, and G3 whose sectional shapes gradually change are provided between the regions R, P, and N. Numeral 10 is formed in a ring shape by connecting both ends of one string-like extruded material extruded by a series of extrusion molding.

In the weather strip 10 mounted on the front door 2a, a gradually changing area G1 is provided between the rail area R and the panel area N, and a gradually changing area G2 is provided between the panel area N and the pillar area P. The connecting portions 18 are provided between the pillar region P and the rail region R, respectively.

In the weather strip 10 mounted on the rear door 2b, a gradual change area G2 is formed between the panel area N and the pillar area P, and a gradual change area G3 is formed between the pillar area P and the rail area R. , And a connecting portion 18 is arranged between the rail region R and the panel region N.

In the gradually changing region G1, as shown in FIG. 2 (a), the hollow seal portion 14 moves from the raised shape in the rail region R in the direction of the arrow, that is, toward the mounting surface side to the door 2. It is gradually laid down and gradually changes to the shape in the panel region N. Further, the lip portion 16 is provided in the rail region R.
, The length of the protrusion gradually decreases, and gradually changes to the shape of the panel region N having no lip portion 16.

In the gradual change region G2, as shown in FIG. 2B, the hollow seal portion 14 is gradually laid down in the direction of the arrow from the shape in the panel region N, and the pillar region P
The shape gradually changes to the shape at. The lip 16
Is gradually changed so that the protruding length is gradually increased, and is bent in the direction away from the hollow seal portion 14 in the vicinity of the notch 16a, so that the bending angle is gradually increased.

In the gradually changing region G3, as shown in FIG. 2 (c), the hollow seal portion 14 gradually rises from the laid shape in the pillar region P and gradually changes to the shape in the rail region R. ing. In addition, the lip portion 16 gradually decreases its bending angle to 0 ° and its projection length gradually increases, and gradually changes to a shape in the rail region R.

In manufacturing the weather strip 10, as shown in FIG. 5, an extrusion die 52 of an extruder 50 is used.
From the extruded weather strip 1
0 is guided to the vulcanizer 54, vulcanized on a belt 56 running in the vulcanizer 54, then cooled by a cooler 58, and cut into predetermined dimensions by a cutter 60.

More specifically, as shown in FIG.
In addition, the weather strip 10 is extruded from the product opening 53 of the second and the supporting rubber 62 for supporting the extruded weather strip 10 in a predetermined posture at the time of vulcanization is attached to the extrusion die 5.
Extrude through the second opening 64. This support rubber 62 is provided as shown in FIG.
(A) As shown in FIG.
The first support portion 62a for supporting the hollow seal portion 14 at a predetermined height, and the second support portion 6 for supporting the lower surface of the mounting base 12
2b. These are respectively extruded from two openings 64a and 64b provided in the extrusion die 52 as shown in FIG. 4 and joined in an L-shaped cross section before vulcanization as shown in FIG. Then, it is attached to the weather strip 10 and supports the weather strip 10 in a predetermined posture on a belt 56 in a vulcanizer 54 during vulcanization. The supporting rubber 62 is separated from the weather strip 10 after cooling.

Hereinafter, the hollow seal portion 14 and the lip portion 1
The gradual change method 6 will be described.

As shown in FIGS. 3 and 4, the hollow seal portion 14 is gradually changed by using a first sliding member 66 slidably disposed on the front surface of the extrusion die 52. This first sliding member 66
Slides on the extrusion mouthpiece 52, so that the support rubber 6
It is configured such that the opening 64a through which the second first support portion 62a is extruded is gradually closed, so that the height of the first support portion 62a can be gradually changed. The sliding member 66
Is preferably about 0 to 8 mm.

In the gradual change region G1, the first sliding member 66 is moved upward in FIG. 4 to change the state of the first support portion 62a from the state of FIG. 6A to the state of FIG. Change gradually so that the height becomes low. Thus, the hollow seal portion 14 is gradually deformed downward by its own weight and formed.

In the gradual change region G2, the first sliding member 66 is moved further upward in FIG. 4 to change the height of the first support portion 62a from the state of FIG. 6B to the state of FIG. The shape is gradually changed, and the shape is further changed downward.

In the gradual change area G3, the height of the first support portion 62a is changed from the state shown in FIG. 6C to the state shown in FIG. 6A by moving the first sliding member 66 downward in FIG. Is gradually changed so as to increase, and the shape is changed upward.

As shown in FIGS. 3 and 4, a gradual change of the lip portion 16 includes a second sliding member 68 slidably disposed on the front surface of the extrusion mouthpiece 52 and a front side of the extrusion mouthpiece 52. This is performed using the pressing roller 70 that has been used.

Here, the second sliding member 68 is formed of the extrusion die 5
2, the lip forming hole 53 a of the product opening 53 is gradually closed from its tip, and the lip 16
Is configured to be able to gradually change the protrusion length. The sliding width of the second sliding member 68 is 0 to 8 m.
m is preferable.

The pressing roller 70 is arranged so as to be movable in the direction indicated by the arrow in the drawing, and by this movement, immediately after the weather strip 10 is extruded, the vicinity of the notch 16a of the lip portion 16 is gradually reduced. When pressed, the bending angle of the lip portion 16 can be gradually changed. Note that the bending angle is preferably about 0 ° (that is, a shape that does not bend) to about 30 °.

In the gradually changing region G1, the second sliding member 68 is moved downward in FIG. 4 so as to gradually change from the state of FIG. Finally, the lip forming hole 53a is almost completely closed to reach the state shown in FIG.

In the gradual change region G2, by moving the second sliding member 68 upward in FIG. 4, the protruding length of the lip portion 16 is increased from the state shown in FIG. 6B to the state shown in FIG. Then, the lip portion 16 is gradually bent by moving the pressing roller 70 to press the vicinity of the cut 16a.

In the gradually changing region G3, the pressing roller 70 is gradually moved in the opposite direction to release the above-mentioned pressing, so that the lip portion 16 is gradually returned to a non-bending shape. By moving the moving member 68 upward in FIG. 4, the lip portion 16 is gradually changed to the state shown in FIG.

In the above description, the gradual change region G1 is changed from the rail region R to the panel region N, the gradual change region G2 is changed from the panel region N to the pillar region P, and the gradual change region G3 is changed from the pillar region P to the rail region R. Can be performed in the opposite direction. That is, for example, the gradually changing area G1 may be changed from the panel area N to the rail area R.

According to the manufacturing method of this embodiment described above, the hollow seal portion 14 and the lip portion 16 are disposed over the entire circumference of the door 2 by extrusion and gradual change, and the respective regions R, P, and N in the circumferential direction are arranged. Thus, the weather strip 10 having various cross-sectional shapes can be extruded with one extrusion die 52. That is, each area R, P,
Weatherstrip 10 that satisfies the required performance in N
Can be manufactured with one extrusion die 52. Therefore, only one connecting portion 18 is required when forming the annular shape, so that the manufacturing cost can be reduced and the obtained weather strip 10 has a good appearance.

In particular, by gradually changing the lip portion 16, it is possible to satisfy the required performance for the entire periphery of the door without impairing the performance of the rail region R (the region having the lip portion 16).

[0042]

According to the method for manufacturing a weather strip for an automobile of the present invention, a weather strip satisfying the required performance in each area in the circumferential direction of the door can be manufactured with one extrusion die. Can be. Therefore, the number of connecting portions can be reduced, and thus, the manufacturing cost can be reduced and the appearance can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state in which an automobile weather strip 10 according to an embodiment of the present invention is mounted on a door 2. FIG.

FIG. 2 is a sectional view of the weather strip 10;
(A) shows a cross section in the rail region R, (b) shows a cross section in the panel region N, and (c) shows a cross section in the pillar region P.

FIG. 3 is a perspective view of an extrusion die 52 during extrusion molding of the weather strip 10;

4 is a front view of the extrusion die 52. FIG.

FIG. 5 is a schematic view of a manufacturing process of the weather strip 10.

6A and 6B are cross-sectional views of the weather strip 10 at the time of vulcanization, where FIG. 6A is a cross-section in a rail region R, FIG. 6B is a cross-section in a panel region N, and FIG. Is shown.

FIG. 7 is a schematic side view of an automobile 1 showing a conventional weather strip 100 mounted on a vehicle.

8A is a sectional view taken along line AA of FIG. 7, FIG. 8B is a sectional view taken along line BB of FIG. 7, and FIG. 8C is a sectional view taken along line CC of FIG.

[Explanation of symbols]

 Reference Signs List 10 weather strip 12 mounting base 14 hollow seal 16 lip 16a cut 52 extrusion die 53 product opening 53a lip forming hole 62 support rubber 62a .., First support portion 64, extrusion opening of support rubber 62 66, first sliding member 68, second sliding member 70, pressing roller G <b> 1, G <b> 2, G <b> 3.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-34449 (JP, A) JP-A-2-34450 (JP, A) JP-A-7-125042 (JP, A) JP-A-8- 90625 (JP, A) JP-A-8-90631 (JP, A) JP-A-9-66551 (JP, A) JP-A-10-6379 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 47/00-47/96

Claims (7)

(57) [Claims] 1. A method for manufacturing a weather strip for an automobile, comprising: a mounting base attached to a peripheral portion of a door of an automobile; and a hollow seal portion extending from the mounting base. And a supporting rubber for supporting the hollow seal portion of the extruded weather strip in a predetermined posture during vulcanization is extruded from the extrusion die, and in a predetermined region in a circumferential direction of the weather strip. A method of manufacturing a weather strip for an automobile, wherein the shape of the hollow rubber seal is gradually changed by gradually changing the shape of the support rubber. 2. The manufacturing method according to claim 1, wherein a sliding member is arranged on the extrusion die, and the sliding member is moved to close at least a part of the extrusion opening of the support rubber. A method for manufacturing a weather strip for an automobile, wherein the shape of the supporting rubber is gradually changed. 3. The weather strip includes a lip protruding from the mounting base, and in the predetermined region in the circumferential direction, the shape of the hollow seal portion is gradually changed, and the shape of the lip portion is gradually changed. 2. The method for manufacturing a weather strip for an automobile according to claim 1, wherein 4. The manufacturing method according to claim 3, wherein the change in the shape of the lip portion is a change in a protruding length of the lip portion. 5. The manufacturing method according to claim 4, wherein a second sliding member is disposed on the extrusion die, and the second sliding member is moved to move at least the lip forming hole of the product opening. A method for manufacturing a weather strip for an automobile, wherein a protruding length of the lip portion is gradually changed by partially closing the lip portion. 6. The method according to claim 3, wherein the change in shape of the lip portion is a change in a bending angle thereof. 7. The manufacturing method according to claim 6, wherein a notch is provided in the lip portion, and immediately after the extrusion, the vicinity of the notch is pressed by a pressing means such as a roller disposed in front of the extrusion die. A method for manufacturing a weather strip for an automobile, wherein the bending angle of the lip portion is gradually changed.