JPH04173318A - Manufacture of weatherstrip and its device - Google Patents

Abstract

PURPOSE:To set hollow or solid freely and set molding or not molding a hollow seal section freely by moving a shutter properly to a molding mouth of an extrusion molding die and varying the molded shape of the hollow seal section of a weatherstrip. CONSTITUTION:In the case a shutter 200 is lifted up to the upper side and the whole of an anchor section molding mouth 101 and a hollow seal section molding mouth 102 of an extrusion molding die 100 is opened, an anchor section 31 and a hollow seal section 32 are extrusion-molded integrally. When the shutter 200 is slightly lowered, the upper side section of the hollow seal section 32 is molded in a manner of being crushed in the flat shape with the height corresponding to the lowered degree of the shutter 200. When the shutter 200 is further lowered, the hollow seal section 32 is turned into a solid small projection formed on the anchor section 31 and fed out to the outside. When the shutter 200 is further lowered to the lowest end position, the hollow seal section 32 is not molded, but the anchor section 31 is molded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a weather strip in which a weather strip consisting of an anchor part and a hollow seal part is integrally and continuously extruded from an extrusion die. - Concerning a method and apparatus for manufacturing a strip.

(Prior Art) Weather strips are often used as sealing members in various parts of vehicles that require sealing.

For example, in the automobile shown in FIG. 10, a door weather strip is installed along an automobile door opening 2 to which a front door 1 is attached. The installed state of this weather strip is shown in Figures 11 and 12.
As shown in the figure.

First, as shown in FIG. 11, the weather strip 3 includes an anchor portion 31 having a substantially U-shaped cross section and attached to the door opening flange 20 on the vehicle body side, and a side surface of the anchor portion 31 that projects from the side surface of the anchor portion 31. A hollow seal portion 32 is provided. The anchor part 31 is generally made of solid rubber such as EPDM, and a core material 30 is embedded therein along a U-shape.

Furthermore, retaining lips 33 are formed protrudingly on both inner facing wall surfaces of the U-shape, and these retaining lips 33 provide a retaining force for the door opening flange 2o. The hollow seal portion 32 is generally made of sponge rubber such as ethylene propylene, which has excellent weather resistance.
The anchor portion 31 is provided in a protruding manner.

Here, if the hollow seal portion 32 is provided over the entire length of the weather strip, the closing force of the door will increase, and wind noise will be particularly likely to occur, for example, at the front pillar 21 and roof side 22 in FIG. 10. For this reason, the hollow seal portion 32 is often formed only at the portion where it is attached to the front pillar 21 and the roof side 22.

In the portion where the hollow seal portion 32 is not formed, the twelfth
As shown in the figure, the weather strip 3 consists only of anchor portions 31 and is not provided with the hollow seal portion 32 shown in FIG. 11.

Conventionally, the anchor portion 31 and the hollow seal portion 32 in the weather strip 3 having such a structure are integrally and continuously extruded. The extrusion molding die used for this integral and continuous extrusion molding includes the anchor portion 31 of the weather strip described above.
Anchor part molding port and hollow seal part 32 for extruding
An extrusion molding port is provided for extruding the anchor portion 31 and the hollow seal portion. The entire shape consisting of 32 is extruded integrally and continuously.

At this time, as described above, for parts where the hollow seal part 32 is unnecessary, the step of crushing the hollow seal part 32 before vulcanization is performed using a roller, as described in, for example, Japanese Unexamined Patent Publication No. 61-215145. It is applied using means etc.

(Problem to be Solved by the Invention) However, in the conventional weatherstrip manufacturing method in which the unnecessary hollow seal portion is crushed after the weatherstrip is molded over the entire length, the hollow seal portion is formed in the longitudinal direction. It is necessary to add a separate process of crushing the parts at predetermined intervals, which poses a problem of low productivity, as well as poor dimensional accuracy of the crushed parts, which also poses problems in wearability.

Therefore, when integrally extruding the anchor part and the hollow seal part in a weatherstrip, the present invention provides a method for determining the shape of the hollow seal part, particularly setting the hollow or solid shape, and forming/unforming the hollow seal part. It is an object of the present invention to provide a method for manufacturing a weather strip that allows the weather strip to be freely set.

(Means for Solving the Problems) In order to achieve the above object, the inventions according to claims 1 and 2 include an anchor part attached to a vehicle body side flange part, and a hollow seal part protruding from the anchor part. In the method for producing a weatherstrip, the weatherstrip is integrally and continuously extruded from an extrusion molding port of an extrusion molding die to form a weatherstrip. The process of integrally molding the entire shape of the anchor part and the hollow seal part by extruding from the entire extrusion molding port of the molding die, and the shutter attached to the extrusion molding die, the hollow seal of the extrusion molding port is A part of the molded part is closed, and the entire cross-sectional shape of the anchor part and a part of the cross-sectional shape of the hollow seal part are crushed into a hollow shape on the anchor side and integrally extruded. and closing the molded part of the hollow seal part of the extrusion molding opening with the shutter except for the protruding part with the anchor part, and the entire shape of the cross section of the anchor part and the whole shape of the hollow seal part in cross section. A step of integrally extruding the molded portion of the hollow seal portion on the anchor side, and closing the entire molded portion of the hollow seal portion of the extrusion molding port with the shutter, and forming the entire shape of the cross section of the hollow seal portion. The structure includes a step of crushing the anchor portion into an unformed state and extruding only the entire shape of the cross section of the anchor portion.

In addition, the invention according to claim 3 provides an anchor part attached to a vehicle body side flange part and a hollow seal part protruding from the anchor part integrally and continuously from an extrusion molding port of an extrusion molding die. In the weatherstrip manufacturing apparatus, the extrusion die has a shutter for adjusting the opening area of the hollow seal portion of the extrusion die. The shutter is attached so as to be movable back and forth, and the shutter has an inclined guide surface that guides the material in a direction that crushes the hollow seal portion extruded from the extrusion molding port toward the anchor side, and a slope guide surface that guides the material in a direction that crushes the hollow seal portion that is extruded from the extrusion molding port toward the anchor side. The structure includes a surplus material discharge path for discharging surplus material to the outside.

(Function) With the means having such a configuration, the entire shape of the anchor part and the hollow seal part of the weatherstrip can be integrated into one piece by simply moving the shutter appropriately with respect to the extrusion molding port of the extrusion molding die. The molding state can now be arbitrarily selected, such as by molding the hollow seal part into a solid shape, by crushing the hollow seal part to make it solid, or by extruding only the anchor part while leaving the hollow seal part in an unformed state. There is.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, an example of a weather strip for an automobile door manufactured according to the present invention will be explained with reference to FIGS. 10 to 12.

In the automobile shown in FIG. 10, a door weather strip is installed along an automobile door opening 2 to which a front door 1 is attached. The installed state of this weather strip is shown in FIGS. 11 and 12.

As shown in FIG.
The anchor part 31 has a substantially U-shaped cross section and is attached to the door opening flange 20 on the vehicle body side, and a hollow seal part 32 is provided protruding from the side surface of the anchor part 31. The anchor portion 31 is generally made of solid rubber such as EPDM, and a core material 30 is embedded therein along a U-shape. Further, retaining lips 33 are formed protrudingly on both inner facing wall surfaces of the U-shape, and the retaining lips 33 provide a retaining force for the door opening flange 20. Further, the hollow seal portion 32 is generally made of sponge rubber such as ethylene propylene which has excellent weather resistance, and is provided so as to protrude integrally with the anchor portion 31 .

If the hollow seal portion 32 is formed over the entire length of the weather strip, the closing force of the door will increase, and wind noise will be likely to occur particularly at the front pillar 21 and roof side 22 as shown in FIG. For this reason, the hollow seal portion 32 is formed only at the portion where it is attached to the front pillar 21 and the roof side 22.

In the portion where the hollow seal portion 32 is not formed, the twelfth
As shown in the figure, the weather strip 3 consists only of an anchor portion 31, and is not provided with the hollow seal portion 32 shown in FIG.

Next, an embodiment of an apparatus for integrally and continuously extruding the weather strip 3 having such a structure using the present invention will be described.

As shown in FIGS. 1(a) and 1(b), the extrusion molding die 100 includes the above-mentioned weather strip 3.
Anchor part molding port 1 for extruding the anchor part 31 of
01 and a hollow seal part forming opening 102 for extruding the hollow seal part 32. Further, a core 103 of a pothole forming a hollow portion is disposed in the hollow seal portion molding mouth 102 . The anchor part molding port 101
is formed by forming a plurality of protruding openings for lip formation in a part of an elongated main opening, and the hollow seal part forming opening 102 is formed in the shape of a front opening forming a part of a circular shape. There is. A die-side inclined guide surface 104 is provided at the circular opening edge portion of the hollow seal portion molding port 102. This die-side inclined guide surface 104 is formed in the extrusion direction (FIG. 1(b)
) to the left).

Further, on the front side of the extrusion die 100, that is, on the left end side in FIG. 1(b), the hollow seal opening 1 is provided.
A shutter 200 for adjusting the opening area of 02 is attached in a close contact state.

This shutter 200 is moved in a direction perpendicular to the extrusion direction (
The shutter 200 is installed so as to be able to reciprocate in the vertical direction (in the figure), and a shutter-side flat guiding surface 201 formed in a flat surface shape is provided at the front end in the extrusion direction at the lower end of the shutter 200 . This shutter-side flat guiding surface 201 is.

When the shutter 200 descends to the lowest position (fourth
In the state shown in the figure), it is formed so as to coincide with the upper end of the elongated main opening in the anchor part molding port 101 of the extrusion molding die 100.

Further, in a portion from the shutter-side flat guide surface 201 toward the extrusion molding die 100 side on the back side, there is a shutter that guides the material in the direction of crushing the hollow seal part extruded from the hollow seal part molding port 102 toward the anchor side. A side inclined guide surface 202 is formed. This shutter-side inclined guide surface 202 is similar to the shutter-side flat guide surface 20
The shutter 200 has a predetermined slope that rises toward the weighing molding die 100 side, and the rear edge facing the extrusion molding die 100 side is formed in a substantially semicircular shape, and the shutter 200 reaches the lowest position. When lowered (the state shown in FIG. 4), the hollow seal portion of the extrusion molding die 100 is formed so as to be removed from the molding opening 102.

Furthermore, the shutter 200 is formed with an excess rubber discharge channel 203 that penetrates obliquely with respect to the extrusion direction. This surplus rubber discharge channel 203 discharges surplus material to the outside by crushing the hollow seal portion toward the anchor,
The opening 203a on one end side, which is provided so as to face 0, communicates with the die-side inclined guiding surface 104 as the shutter 200 moves up and down (FIGS. 3 and 4), or the die-side inclined guiding surface 104. (Fig. 1, Fig. 2)
located at the location. The surplus rubber discharge flow path 203 extends obliquely upward in the extrusion direction from the opening 203a, and has an opening 203 to the external space at the tip of the extension.
It has b.

An embodiment of the present invention using such an extrusion molding apparatus for weather stripping 3 will be described next.

First, as shown in FIGS. 1(a) and 1(b), the shutter 200 is pulled upward, and the entire anchor portion molding port 101 and hollow seal portion molding port 102 of the extrusion molding die 100 are opened. When the weather strip 3 is in an open state, the entire cross-sectional shape of the weather strip 3 is extruded from the entire molding opening of the extrusion molding die, and the entire shape of the anchor portion 31 and the hollow seal portion 32 are integrally formed. Extruded.

The final processed shape of the weatherstrip formed in this state is shown in FIGS. 5 and 6. In the weatherstrip 3 in this case, both the anchor portion 31 and the hollow seal portion 32 are molded into perfect shapes.

As shown in FIGS. 2(a) and 2(b), the shutter 200 has been lowered slightly from the state shown in FIG.
2 comes to cover the front part of the hollow seal part molding port 102 of the extrusion molding die 100, the upper part of the hollow seal part 32 that is extruded from the hollow seal part molding port 102 of the extrusion molding die 100 is , comes into contact with an intermediate portion of the shutter-side inclined guide surface 202 of the shutter 200. As a result, the upper half of the hollow seal portion 32 is pushed downward in the figure by the guiding action of the shutter-side inclined guiding surface 202, and is crushed toward the anchor portion while maintaining its hollow state. Then, it passes through the shutter-side flat guide surface 201 at the lowest end and is sent out to the outside.

The final processed shape of the weatherstrip formed in this state is shown in FIGS. 5 and 7. The upper part of the hollow seal part 32 extruded into a circular shape from the hollow seal part molding port 102 of the extrusion molding die 100 is molded into a flat shape with a height corresponding to the degree of descent of the shutter 200. On the other hand, the anchor portion 31 is molded into a perfect shape.

As the shutter 200 is further lowered, the image shown in FIG. 3 (
As shown in a) and (b), most of the hollow seal molding opening 102 except for the protruding part with the anchor part is closed by the shutter 200, and the shutter 200 is closed by the shutter 200. The inclined guide surface 104 on the die side
Through the hollow seal part molding port 102, the shutter 20
It communicates with a part of the surplus rubber discharge channel 203 on the 0 side.

As a result, a part of the hollow seal part 32 extruded from the hollow seal part molding port 102 of the extrusion die 100 comes into contact with the upper edge part of the shutter side inclined guiding surface 202, and Due to the guiding action, most of the hollow seal portion 32 is pushed downward in the figure and crushed toward the anchor portion.
A small solid protrusion is formed on the anchor portion. Further, at this time, the surplus material for forming the solid small protrusions is discharged to the outside through the surplus rubber discharge channel 203 by the dividing action of the shutter 200.

The final processed shape of the weatherstrip formed in this state is shown in FIGS. 5 and 8. The hollow seal part 32 extruded in a circular shape from the hollow seal part molding port 102 of the extrusion molding die 100 becomes a small solid projection formed on the anchor part 31 and is sent out to the outside. Also, the material that is no longer needed to form the solid small protrusions is discharged from the surplus rubber discharge channel 203.
The amount of material used to form the solid protrusions and the amount of discharge are adjusted so as to be appropriately balanced by vertical movement of the shutter 200.

Furthermore, as shown in FIG.
When the shunter-side flat guiding surface 201 descends to the lowest position, the shunter-side flat guiding surface 201 is moved to the anchor portion molding port 1 of the extrusion molding die 100.
01 corresponds to the upper edge of the elongated main opening. At this time, the shutter side inclined guide surface 202 of the shutter 200
The upper edge of

The hollow seal portion of the extrusion molding die 100 is separated from the molding port 102 of the extrusion molding die 100 and comes into contact with the end face portion of the core 103, and the entire hollow seal portion molding port 102 of the extrusion molding die 1o○ is formed on the die side inclined guiding surface. 104 and communicates with the surplus rubber discharge channel 203 on the shutter 200 side. As a result, the entire amount of the hollow seal part 32 extruded from the hollow seal part molding port 102 of the extrusion molding die 1oO is discharged to the outside through the surplus rubber discharge channel 203 on the shutter 200 side.

The final processed shape of the weatherstrip formed in this state is shown in FIGS. 5 and 9. The formation of the hollow seal portion 32 is no longer completed, while the anchor portion 31 is molded into a perfect shape.

As described above, in this embodiment, the extrusion molding die 100
By simply moving the shutter 200 appropriately relative to the extrusion molding port, the entire shape of the anchor portion 31 and the hollow seal portion 32 of the weather strip 3 can be integrally extruded, or the hollow seal portion 32 can be crushed to form a hollow seal. It is possible to select any desired molding method, such as making the anchor part 31 in an actual state or extruding only the anchor part 31 while leaving the hollow seal part 32 in an unmolded state. As shown in FIG. 5, the weatherstrip 3 in which the cross-sectional shapes of the hollow seal portions 32 are varied in the longitudinal direction is integrally and continuously extruded.

The present invention can be similarly applied to all kinds of weather strips attached to door sashes, door frames, trunks, etc.

(Effects of the Invention) As described above, the present invention changes the molded shape of the hollow seal portion of the weather strip by appropriately moving the shutter with respect to the molding opening of the extrusion molding die. While integrally extruding the anchor part and the hollow seal part of the weatherstrip, the shape of the hollow seal part, particularly setting the hollow or solid shape, and forming/non-forming of the hollow seal part can be freely set. This makes it possible to improve the productivity of the weather strip, and also to improve the dimensional accuracy, especially in the unformed portion of the hollow seal.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams sequentially showing a weather strip manufacturing apparatus and extrusion process in an embodiment of the present invention, and each (a) in FIGS. 1 to 4 is a front view. , each (b) in FIGS. 1 to 4 is a vertical sectional view, FIG. 5 is a side explanatory view showing an example of a weather strip manufactured by implementing the present invention, and FIG. The cross-sectional view along the VI-VI line in the middle, Figure 7 is the ■- in Figure 5.
Figure 8 is a cross-sectional view along line ■--■ in Figure 5, Figure 9 is a cross-sectional view along line IX-IX in Figure 5, and Figure 10 is a cross-sectional view along line IX-IX in Figure 5. FIGS. 11 and 12 are perspective views showing an example of an automobile equipped with a weather strip, and cross-sectional views showing the state in which the weather strip is mounted. 3... Weather strip, 31... Anchor part,
32...Hollow seal part, 100...Extrusion molding die,
101...Anchor part molding port, 102...Hollow seal part molding port, 104...Die side inclined guide surface, 200...
Shutter, 201... flat guide surface on the shutter side. 202. Shutter side inclined guide surface, 203... Surplus rubber discharge channel. Author: Takashi Goto 9 Graves, (and 1 other person) "Yugo・4 3 [North - Figure 3 (0) (b) 1 Item Figure 4 Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] 1. An anchor part attached to a vehicle body side flange part and a hollow seal part protruding from the anchor part are continuously extruded integrally from an extrusion molding port of an extrusion molding die. In the method for manufacturing a weatherstrip, the entire cross-sectional shape of the weatherstrip is extruded from the entire extrusion port of the extrusion molding die to form the entire shape of the anchor portion and the hollow seal portion. A step of integrally molding, and a shutter attached to the extrusion molding die closes a part of the hollow seal part forming part of the extrusion molding port, and the entire shape of the cross section of the anchor part and the hollow seal part are closed. A step of integrally extruding a part of the entire cross-sectional shape of the anchor portion with a hollow shape pressed onto the anchor portion side;
The shutter closes off the molded part of the hollow seal part of the extrusion molding port except for the protruding part with the anchor part, and the entire shape of the cross section of the anchor part and the whole shape of the cross section of the hollow seal part are closed on the anchor part side. and a step of integrally extruding the molded part of the hollow seal part of the extrusion molding port with the shutter, so that the entire shape of the cross section of the hollow seal part is removed from the anchor part side. A method for manufacturing a weatherstrip, comprising the steps of crushing the anchor portion into an unformed state and extruding only the entire shape of the cross section of the anchor portion. 2. In the method for manufacturing a weatherstrip according to claim 1, the step of covering the molded part of the hollow seal part of the extrusion molding port in the extrusion molding die with a shutter removes the surplus material due to the crushing of the hollow seal part. A method for manufacturing a weather strip, comprising a step of discharging it to the outside. 3. Molding a weather strip by integrally and continuously extruding the anchor part attached to the vehicle body side flange part and the hollow seal part protruding from the anchor part from the extrusion molding port of the extrusion molding die. In the weatherstrip manufacturing apparatus, the extrusion molding port of the extrusion molding die is provided with a shutter that is movable back and forth for adjusting the opening area of the hollow seal portion forming part of the extrusion molding port, and The shutter has an inclined guiding surface that guides the material in the direction of crushing the hollow seal part extruded from the extrusion molding port towards the anchor side, and discharges the excess material by crushing the hollow seal part towards the anchor side to the outside. 1. A weatherstrip manufacturing device, comprising: a surplus material discharge path;