JPH05310086A - Door weather strip and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a weather strip capable of installing it by bending with a hollow seal part kept in a hollow state by making smaller both curvature and bent angle according to a sharp corner part at a door opening of a vehicle. CONSTITUTION:Using a pair of corner forming dies B1 and B2 for the forming surfaces 1 and 2 of which a forming projected part and forming recessed part are provided, respectively, a possible corner installation part of a non-vulcanized extruded product is clamped by the corner forming dies B1 and B2 immediately after extrusion has been completed, run together with the extruded product, and an entire hollow seal part Ws including a part between the corner forming dies B1 and B2 is vulcanized and formed. Then the corner forming dies B1 and B2 are removed from the extruded product to form a corner mounting curved part C of small curvature at the hollow seal part Ws.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door weather strip that can be bent without problems by following a severe corner of a door opening on the vehicle body side, which is a mounting site, and a method of manufacturing the same.

[0002]

2. Description of the Related Art There is a strict corner portion having a small curvature and a small intersection angle around a door on a vehicle body side where a door weather strip (hereinafter simply referred to as "weather strip") is mounted. Conventionally, in order to attach a weather strip to this portion, the corner portion is molded, and a separate weather strip is joined, and deburring that occurs in the molded portion after molding is performed. With this molding method, the number of steps such as molding and deburring is increased, and the molding portion is clearly recognized due to the molding line, color, etc., and there is a problem that the appearance is impaired. Further, Japanese Patent Application Laid-Open No. 59-171735 discloses a technique of bending a hollow seal portion which is a corner portion of a weather strip, and this molding technique uses a movable mold during extrusion molding. Since the hollow seal portion is curved by moving in a direction orthogonal to the extrusion direction of the extrusion-molded product, the curvature of the curved portion is large. Therefore, if the bending angle is reduced, the hollow seal portion is flattened, and it is impossible to bend the weather strip corresponding to a severe corner portion where both the curvature and the crossing angle are small.

[0003]

DISCLOSURE OF THE INVENTION The present invention follows the strict corners of the door opening on the vehicle body side to reduce both the curvature and the bending angle, and to fold the hollow seal while maintaining the hollow shape. The present invention has been made for the purpose of providing a weather strip that can be mounted by attaching it, and a manufacturing method thereof.

[0004]

Means for Solving the Problems The weather strip according to the present invention is formed by laterally sloping without changing the root position along the longitudinal direction of extrusion with respect to the anchor portion and maintaining a continuous hollow shape. It is characterized in that the corner mounting bent portion whose ridge line is bent with a small curvature to form a substantially V-shape is intermittently formed in the hollow seal portion. Further, the method for manufacturing a weather strip according to the present invention uses a pair of corner molding dies each having a molding convex portion and a molding concave portion formed on a molding surface, and is used for corner mounting of an unvulcanized extruded product immediately after extrusion. A predetermined part is clamped by the pair of corner molding dies, and while moving the pair of corner molding dies in the extrusion direction at the same speed as the extrusion molded product, including the portion clamped by the pair of corner molding dies. After heating and vulcanizing the entire hollow seal part, the pair of corner molding dies are released from the mold, and the clamping and demolding are repeated at regular intervals to form the corner mounting curved part in the hollow seal part. It is characterized by intermittent molding.

[0005]

Since the weather strip according to the present invention has the above-described structure, it can be bent with its curvature and bending angle both reduced while maintaining its hollow shape in the corner mounting bent portion. At the same time, when it is bent in this way, the corner mounting bent portion that is formed to be inclined outward is caused, and the standing angle with respect to the anchor portion becomes almost the same as that of the other portions. Moreover, even if it is bent with a small curvature in the corner mounting bend, the hollow shape of this part is maintained and it is the same shape as the other parts, so when it is installed in the door opening of the car body side of the car Keeps a sense of unity between the corner and the straight section. Further, according to the method for manufacturing a weather strip according to the present invention, the corner mounting planned portion of the unvulcanized extruded product immediately after extrusion is clamped by the pair of corner molding dies, and the ridge line of the clamped portion is formed in a substantially square shape. And then
In order to heat and vulcanize the entire hollow seal part including the clamped part in this state, and then to remove the pair of corner molds that clamp the hollow seal part, It is possible to simultaneously mold the small curved part for corner mounting to the hollow seal part.

[0006]

EXAMPLES The present invention will be described in more detail with reference to examples. FIG. 1 is a front view of a molding apparatus when the corner mounting curved portion C is not molded, FIG. 2 is a plan view of the same, and FIG. 3 is a molding diagram when the corner mounting curved portion C is molded. FIG. 4 is a front view of the device, and FIG. 4 is a plan view of the same. An extrusion-molded product of a weather strip W is continuously extruded from the extrusion molding die A, and the weather strip W is extruded in a state in which the hollow seal portion Ws is integrally molded to the anchor portion Wa via the neck portion Wn.
The anchor portion Wa is formed of semi-hard rubber, and the hollow seal portion Ws and the neck portion Wn are formed of expandable soft rubber.

In the present invention, the weather strip W
In the state where the hollow seal portion Ws of the extruded product is clamped, a pair of corner forming molds B _{1 and} B ₂ are used which move at the same speed as this extruded product and are released from the mold after traveling a predetermined distance. It As shown in FIG. 10, extrusion die A
The portion of the hollow seal portion Ws of the weather strip W extruded from is heated and vulcanized and foamed while passing through the high frequency heating device D and the hot air vulcanization device E arranged on the running line. It has become. The pair of corner molding dies B _{1 and} B ₂ clamp the corner mounting planned portion of the unvulcanized weather strip W immediately after exiting the extrusion molding die A, and in this clamped state, the weather strip W is clamped.
In parallel with this, the high-frequency heating device D and the hot-air vulcanization device E are sequentially inserted into the high-frequency heating device D and the hot-air vulcanization device E, and the mold is demolded at the end portion.

5 to 9 show the pair of corner molding dies B _{1 and} B ₂ described above. The pair of corner molding dies B _{1 and} B ₂ are split dies for clamping the corner mounting curved portion C by clamping the hollow seal portion Ws of the weather strip W immediately after extrusion from both sides. The corner mounting curved portion C is formed by laterally forming the hollow seal portion Ws without changing the root position along the longitudinal direction of extrusion with respect to the anchor portion Wa and maintaining a continuous hollow shape. The ridge line connecting the vertices, which is a portion, has a substantially V shape curved with a small curvature. The inner surfaces of the pair of corner molding dies B _{1 and} B ₂ facing each other are molding surfaces 1 and 2 each having a substantially semicircular cross section, and the longitudinal direction of the molding surface 1 of _one corner molding die B ₁ At the central portion of the mold, there is formed a molding convex portion 3 having a substantially V-shaped planar shape and protruding while maintaining a substantially semicircular cross section, and the other corner molding die B ₂ is formed. A molding concave portion 4 is formed in the center of the molding surface 2 in the longitudinal direction so as to correspond to the molding convex portion 3 and have a plane shape of a substantially V shape while maintaining a substantially semicircular cross section. Are formed. As shown in FIG. 3, each corner molding die B _1, B ₂
Between the molding surfaces 1 and 2 and the outer peripheral surface of the hollow seal portion Ws in a state in which the hollow seal portion Ws of the weather strip W is inserted into the molding space surrounded by the molding surfaces 1 and 2. Is designed so that a predetermined gap 11 is formed in consideration of the foaming margin of the hollow seal portion Ws. Fitting portions 5 and 6 that are fitted to each other are formed along the longitudinal direction at the upper end portions of the inner side surfaces of the corner molding dies B _{1 and} B ₂ , respectively. In addition, each corner mold B _1,
As shown in FIG. 7, which is a front view of the state where B ₂ is clamped, the lower end of the inner side surface of each corner mold B _1, B ₂ is located outside the anchor portion Wa of the weather strip W. Anchor holding surfaces 7 and 8 for lightly contacting and holding the portions are formed, respectively, and are connected to the anchor holding surfaces 7 and 8 to connect the neck portion Wn of the weather strip W.
Neck holding surfaces 9 and 10 for holding the both sides from each side are formed. In the portions where the convex portions 3 and the concave portions 4 of the molding surfaces 1 and ₂ of the respective corner molding dies B _{1 and} B ₂ are formed, the neck holding surfaces 9 and 10 are formed on the molding convex portions 3 and the concave portions 4, respectively. Correspondingly inclined.

A pair of corner molding dies B _{1, having the} above-mentioned construction _.
Using B ₂ to intermittently form the corner mounting curved portion C at a predetermined interval in the hollow seal portion Ws of the weather strip W continuously extruded from the extrusion die A, use the following procedure. To do so. 1 and 2 show a state in which the pair of corner molding dies B _{1 and} B ₂ are separated with the weather strip W before vulcanization extruded from the extrusion molding die A sandwiched therebetween. In this state, the pair of corner molding dies B _{1 and} B ₂ are brought close to each other to clamp the corner mounting planned portion of the weather strip W, and the pair of corner molding dies B _{1 and} B ₂ are extruded at a predetermined speed. The weather strip W is running at the same speed. In this way, when the weather strip W is clamped by the pair of corner molding dies B _{1 and} B ₂ , the anchor portion holding surfaces 7 and 8 of the weather strip W allow the anchor portion W of the weather strip W to be clamped.
While a is lightly held, the corner mounting planned portion of the hollow seal portion Ws is sandwiched by the molding surfaces 1 and 2 from the outside, whereby the molding convex portion 3 and the molding convex portion 3 formed in the central portion of the molding surfaces 1 and 2 are formed. The hollow portion Ws is inclined laterally by the molding recess 4. When the hollow seal portion Ws is tilted to the side, the anchor portion Wa is lightly held by the anchor portion holding surfaces 7 and 8 of the corner forming dies B _{1 and} B ₂ , and at the same time, the forming convex portion 3 and the forming portion 3 are formed. Since the neck holding surfaces 9 and 10 of the portion where the concave portion 4 is provided are formed to be inclined in the same direction as the molding convex portion 3 and the molding concave portion 4,
Hollow seal part Ws by a pair of corner molds B _1, B ₂
When is clamped, the portion clamped by the molding convex portion 3 and the molding concave portion 4 is gently inclined laterally around the neck portion Wn. The expected corner mounting portions of the weather strip W continuously extruded from the extrusion molding die A are sequentially clamped by the pair of corner molding dies B _{1 and} B ₂ at a constant pitch as described above.

Further, as shown in FIGS. 11 and 12, before the weather strip W is vulcanized, the hollow seal portion Ws is crushed to provide a portion 12 to be cut. As a matter of course, the pitch of the planned cutting portion 12 is equal to the pitch of the corner mounting portion where the weather strip W is clamped by the pair of corner molding dies B _{1 and} B ₂ .

Then, a pair of corner molding dies B _{1 and} B having the corner mounting portions of the weather strip W clamped.
_{When 2} enters the high frequency heating device D and the hot air vulcanizing device E in parallel with the weather strip W, first, a pair of corner forming dies B _1,
When B ₂ is irradiated with high frequency, this corner forming mold B _1, B
₂ is heated to high temperature. A pair of corner molds B _1, B ₂
The hollow seal portion Ws sandwiched by
The heat of the corner molding dies B _1, B ₂ heated at high temperature is radiatively transferred, and the vulcanization of the foaming raw material (rubber) forming the hollow seal portion Ws in this portion proceeds. When the vulcanization of the foaming raw material progresses, foaming decomposition gas is generated and is confined in the closed space of the hollow seal portion Ws between the scheduled cutting portions 12 and the internal pressure increases. As a result, the pair of corner molding dies B _1, B ₂ in the hollow seal portion Ws are formed.
The portion sandwiched by is pressed against the molding surfaces 1 and 2 by the internal pressure, and the molding surfaces 1 and 2 and the hollow seal portion Ws.
To gap 11 which is formed between an outer peripheral surface of the is closed, the corner mold B ₁ in the hollow seal portion _Ws, B
Due to insufficient heating of the part sandwiched by ₂ , there is no shrinkage in the part. The other portion of the hollow seal portion Ws that is not clamped by the corner molding dies B _{1 and} B ₂ is vulcanized by hot air in the hot air vulcanization device E. In addition,
The pair of corner molding dies B _1, B ₂ in the hollow seal portion Ws may be formed only by the internal pressure generated by the foaming decomposition gas.
If a "shrink" occurs in the area sandwiched between the parts, the air is hollowed from about 0.1 to 0.3 kg / cm ² through an air hole (not shown) provided in the center of the extrusion die A. It may be forcibly blown into the portion Ws.

At the end of the hot air vulcanizer E, a pair of molding dies B _1, B which clamp the weather strip W are clamped.
_{When the} mold ₂ is removed from the mold, as shown in FIGS. 13 to 15, in the hollow seal portion Ws, a substantially C-shaped corner-mounting curved portion C curved with a small curvature is inclined to the side. The corner mounting curved portion C is intermittently molded along the longitudinal direction of the hollow seal portion Ws. Since the corner mounting curved portion C is molded using the pair of corner molding dies B _{1 and} B ₂ having the above-described configuration, the root position along the longitudinal direction of extrusion with respect to the anchor portion Wa changes. Moreover, the hollow shape is almost the same as the other straight parts.

The above-mentioned weather strip W is shown in FIG.
As shown in Fig. 7, it is possible to bend by bending both the curvature and the bending angle at the portion of the corner mounting curved portion C, and even if it is bent in this way, the corner mounting curved portion C is hollow. Since the seal portion Ws is formed so as to be inclined outward as compared with the other straight portions, the corner mounting curved portion C is raised inward, and the standing angle with respect to the anchor portion Wa is different from that of the other straight portions. It is almost the same as the section. Moreover, since the corner-mounting curved portion C is curved and formed with a small curvature while maintaining the same hollow shape as the other straight portions, the entire weather strip W is the corner-mounting curved portion C. Even when bent, the hollow shape of the curved portion C is still maintained. Therefore, when the bent portion C is attached to the door opening portion of the vehicle body of the automobile, the sense of unity between the corner portion and the straight portion is maintained. ..

[0014]

According to the method for producing a weather strip of the present invention, the corner mounting portion of an unvulcanized extruded product immediately after extrusion is clamped by a pair of corner forming dies, and this forming die is extruded. The hollow seal part including the part clamped by the mold is heated and vulcanized in parallel with the product, after which the mold is demolded and the mold is clamped and demolded at regular intervals. In the extrusion molding process, it is possible to simultaneously mold the bent portion for corner mounting having a small curvature, which maintains a hollow shape similar to other portions, in the hollow seal portion in the extrusion molding process. For this reason, the weather strip according to the present invention can be bent with its curvature and bending angle both reduced by bending at the bent portion for corner mounting, so that the curvature and intersection angle of the vehicle body side door opening can be reduced. The weather strip can be bent and installed while keeping the hollow shape of the hollow seal portion of the corner portion, following both small and severe corner portions. As a result, the sense of unity between the corner portion and the straight portion of the attached weather strip is increased, and the aesthetic appearance of the weather strip that also serves as a decoration in the vehicle interior is enhanced.

[Brief description of drawings]

FIG. 1 is a front view of a molding apparatus when a corner mounting curved portion C is not molded.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of a molding apparatus at the time of molding a corner mounting curved portion C.

FIG. 4 is a plan view of the same.

FIG. 5 is a perspective view of corner molds B _{1 and} B ₂ .

FIG. 6 is a front view of the corner molding dies B _{1 and} B _{2 in} a separated state.

FIG. 7: Corner forming dies B _1, B ₂ in a clamped state
FIG.

8 is a sectional view taken along line XX of FIG.

9 is a sectional view taken along line YY of FIG.

FIG. 10 is a diagram for explaining the movement of the corner molding dies B _{1 and} B ₂ .

FIG. 11 is a hollow seal portion W provided with a planned cutting portion 12.
It is a top view of s.

FIG. 12 is a vertical sectional view of the same.

FIG. 13 is a plan view of a weather strip W according to the present invention.

FIG. 14 is a perspective view of a corner mounting bent portion C of the weather strip W according to the present invention.

FIG. 15 is a perspective view of a weather strip W according to the present invention before bending (before mounting).

FIG. 16 is a perspective view of a weather strip W according to the present invention after being bent (when mounted).

[Description of symbols] A: Extruded B _1, B _2: corner mold C: weatherstrip corner mounting curved portion W of: a weather strip Wa: anchor portion Ws: hollow seal portion Wn: the neck 2: Molding surface of corner molding die 3: Molding convex portion of corner molding die 4: Molding concave portion of corner molding die

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B29L 31:30 4F

Claims (2)

[Claims] 1. A door weather strip in which an anchor portion made of a hard material is integrally formed with a hollow seal portion made of a foam material and performing a sealing function by elastic deformation, wherein the hollow seal portion has the anchor portion. The corners are formed by sloping to the side without changing the root position along the longitudinal direction of extrusion and maintaining a continuous hollow shape, and the ridge line is bent with a small curvature to form a V shape. A door weather strip characterized in that the bending portion for mounting is formed intermittently. 2. A hollow seal portion, which is made of a foam material and has a sealing function by elastic deformation, is integrally molded with an anchor portion made of a hard material, and the hollow seal portion is laterally inclined and has a small ridge line. A method for manufacturing a door weather strip in which a bent portion for corner mounting, which is bent into a substantially V shape by curvature, is intermittently molded, wherein a molding convex portion and a molding concave portion are formed on a molding surface. Using a pair of corner forming dies, a corner mounting planned portion of an unvulcanized extruded product immediately after extrusion is clamped by the pair of corner forming dies, and the pair of corner forming dies has the same speed as the extrusion formed product. While heating and vulcanizing the entire hollow seal part including the part clamped by the pair of corner molding dies while moving in the extrusion direction, the pair of corner molding dies is removed. A method for manufacturing a door weather strip, characterized in that the corner mounting curved portion is intermittently formed in the hollow seal portion by repeating the clamping and demolding at regular intervals.