JPH0761691B2 - Method for continuously forming extrudate having interrupted grooves along the longitudinal direction - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for continuously extruding an extrudate having grooves that are interrupted in the longitudinal direction from a basic forming die to form the extrudate.

[Conventional technology]

As one of the extrudates, there is a door seal material that is attached to the periphery of the door opening of an automobile.

In the conventional door seal member 52, as shown in FIGS. 14 to 16, an upper half mounting portion 52b is arranged between two lower half mounting portions 52a, and these joint portions 54 are joined together. They are integrally joined via. The door seal member 52 includes an anchor portion 56 attached to a flange (not shown) provided on the inside of the door frame, and the anchor portion 56.
And an elastically deformable tubular seal portion 58 that is integrally formed with the door and elastically contacts the door to perform a sealing function.

A lower half mounting portion 52a and an upper half mounting portion 52b of the door seal material 52 are mounted on the lower and upper rims of the door opening on the vehicle body side, respectively.

The lower half mounting portion 52a of the door seal member 52 is mounted in combination with a decorative member (not shown) for lining and decorating the passenger compartment, and a connecting portion between the anchor portion 56 and the tubular seal portion 58. Is formed of the same material as the anchor portion 56, and is provided with an insertion groove 60 into which the end portion of the decorative member is inserted.The above-mentioned portion of the upper half mounting portion 52b thereof,
Such an insertion groove 60 is not provided.

And two lower half mounting parts 52a and one upper half mounting part 5
It was joined to 2b through the joining portion 54 by die joining.

As described above, the door seal material 52 is partially combined with the decorative member and is attached to the peripheral edge of the door opening on the vehicle body side. Therefore, the two types of lower half and upper half having different cross-sectional shapes are provided. The mounting portions 52a and 52b are integrally joined together.

In the conventional molding of the door seal member 52, the lower half mounting portion 52a in which the insertion groove 60 is provided in the connecting portion between the anchor portion 56 and the tubular seal portion 58, and the insertion groove 60 is not provided in the portion. The upper half mounting portion 52b was separately molded using two different molding dies, and the mounting portions 52a and 52b were bonded via the bonding portion 54 by die bonding.

Therefore, from the aspect of the molding method, it is necessary to bond the two types of mounting parts 52a, 52b that are molded separately by mold bonding, which increases the processing man-hours, which is a cause of increasing the cost of the product. .

[Problems to be Solved by the Invention]

An object of the present invention is to enable continuous molding of an extruded product having an integral structure having an interrupted groove along the longitudinal direction.

[Means for Solving the Problems]

The present invention for solving this problem is a method of continuously extruding an extrudate having an interrupted groove along the longitudinal direction from a basic forming die to form a groove forming planned portion having a hollow inside. A portion provided in the extrudate, in which a hollow portion inside is exposed by removing the inlet wall portion of the groove forming planned portion by a removing means, and an inlet of the groove forming planned portion. It is characterized by alternately and continuously extruding a portion where the wall portion is left as it is, so that an intermittent groove is exposed along the longitudinal direction of the extrudate.

[Operation of the invention]

The present invention is provided with a groove forming scheduled portion having a hollow inside in the extrudate, and partially removing the inlet wall portion that constitutes the groove forming scheduled portion by the removing means to remove the internal hollow portion. Since the groove is formed so as to be exposed along the longitudinal direction by exposing it, the shape of the groove to be formed is different from the shape and the portion into which the chipping means penetrates into the groove forming planned portion of the extrudate. It is possible to form a groove that is irrelevant and is larger than that portion. Therefore, it is not necessary to mold the entire groove during molding.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to an example in which the present invention is applied to molding of a door seal material.

1 to 4 show a door seal material 2 molded by the method of the present invention, and FIGS. 5 to 7 show this door seal material 2 on the periphery of a door opening of an automobile. The mounted state is shown.

The door seal member 2 includes a U-shaped anchor portion 8 attached to a flange 6 (see FIGS. 6 and 7) projecting from the inside of the door frame 4, and the anchor portion 8
It is integrally formed with the door 21 and comprises an elastically deformable tubular seal portion 10 which elastically contacts the door 21 and performs a sealing function.
The anchor portion 8 is embedded with a core metal 12 for retaining its shape, and is provided with several pieces of mounting lips 14. The anchor portion 8 is made of semi-hard rubber, and the tubular seal portion 10 is made of soft rubber.

In this door seal material 2, a lower half mounting portion 2a and an upper half mounting portion 2b having different cross-sectional shapes are integrally formed without a joint portion.

At the connecting portion between the anchor portion 8 and the tubular seal portion 10 of the lower half mounting portion 2a, there is a decorative member 15 for lining the vehicle interior for decoration.
While an insertion groove 20 for inserting the end portion 16 (see FIG. 6) of each is provided along the longitudinal direction, such an insertion groove is provided in the above-mentioned portion of the upper half mounting portion 2b. The groove 20 is not provided.

That is, of the parts that divide the door seal material 2 into three along the longitudinal direction, the lower half mounting portions 2a of both ends are provided with the inlet wall portion 18 that constitutes the insertion groove forming planned portion 17 missing. The inner hollow portion 19 is exposed so that the insertion groove 20 is provided, but in the upper half mounting portion 2b of the central portion, the inlet wall portion 18 of the insertion groove molding scheduled portion 17 remains. Has become.

The lower half of the door opening of the automobile (the portion indicated by the alternate long and short dash line in FIG. 5) is fitted with the lower half mounting portion 2a of the door seal material 2 in combination with the decorative member 15, and Since the upper half mounting portion 2b of the door seal material 2 is mounted on the upper half portion (a portion indicated by a chain double-dashed line in FIG. 5), the door seal material 2 mounted on the front door opening is The shape before mounting is as shown in FIG.

As shown in FIGS. 5 to 7, the attachment lips 14 of the anchor portions 8 of the lower half mounting portion 2a and the upper half mounting portion 2b of the door seal material 2 are all attached to the flange 6 of the door frame 4. The end portion 16 of the decorative member 15 is inserted into the insertion groove 20 provided in the tubular seal portion 10 of the lower half mounting portion 2a by being elastically contacted with.

In this way, when the door sealing material 2 according to the present invention is mounted on the peripheral edge of the door opening, two types of lower half mounting portions 2a and upper half mounting portions 2b having different cross-sectional shapes are integrally molded. Therefore, the entire product has the same color tone, and like the door seal material that has a conventional joint, the joint and the other part may be subtly different in color and the joint may be recognized, and the appearance may be damaged. It never happens.

Further, FIGS. 8 to 12 show a molding apparatus for extruding and molding the door seal material 2 having the above-mentioned integrally molded structure. The cross-sectional shape of the door seal material 2 immediately after extrusion molding is different from the cross-sectional shape of the door seal material 2 when it is mounted on the peripheral edge of the door opening of an automobile, but the same reference numerals are used for the description.

A basic molding die 24 is attached to the tip of the extrusion head 22,
A movable die 26 is mounted on the front end surface of the basic forming die 24.

The basic molding die 24 has an anchor portion 8 of the door seal material 2.
Extrusion opening for extruding both the tube and the tubular seal portion 10.
28 (see FIG. 12) is provided. A pair of guide blocks 30 are fixed to the front end surface of the basic molding die 24 via bolts 32, and the movable die 26 is guided by the pair of guide blocks 30 in a direction orthogonal to the pushing direction of the door seal material 2. It is possible to move along.

At the tip of the movable die 26, there is provided an intrusion portion 26a having a width corresponding to the width of the inlet wall portion 18 forming the insertion groove forming scheduled portion 17 of the door seal material 2. A drive rod 34 is attached to the upper end of the movable die 26.
The movable die 26 is guided by the pair of guide blocks 30 by the 34 and moves along a direction orthogonal to the extrusion direction of the door seal material 2 to the insertion groove forming planned portion 17 of the door seal material 2 immediately after extrusion. It is designed to enter and leave.

As shown by the solid line in FIG. 9 and the chain double-dashed line in FIG.
In the state of entering into the insertion groove forming scheduled portion 17, a part of the extrusion opening 28 provided in the basic forming die 24 is closed, whereby the inlet wall portion 18 of the insertion groove forming scheduled portion 17 is missing. By exposing the inner hollow portion 19, the insertion groove 20
Is molded. This insertion groove 20 is formed in the intrusion part 26 of the movable die 26.
It has a shape unrelated to a, and is much larger than this.

Further, as shown by the solid line in FIG. 10 and FIG. 12, in the state where the intrusion portion 26a of the movable die 26 is separated from the insertion groove forming planned portion 17, the closed portion of the extrusion opening 28 disappears,
The portion 17 of the door seal material 2 where the insertion groove is to be formed is left as it is, and the insertion groove 20 is not formed.

Therefore, the movable die is moved with respect to the insertion groove forming planned portion 17 of the door seal material 2 which is continuously extruded from the basic forming die 24.
When the entry part 26a of 26 is entered or removed,
As shown in FIG. 13, the anchor portion 8 and the tubular seal portion
The insertion groove 20 is intermittently formed at the connecting portion with the 10, and the lower half mounting portion 2a and the upper half mounting portion 2b are alternately molded.

The ratio of the time for allowing the intruding portion 26a of the movable die 26 to invade the insertion groove forming portion 17 and the time for separating the intruding portion 26a from the insertion groove forming portion 17 is determined by the lower half mounting portion 2a and the upper half. By setting the length ratio to the part mounting portion 2b, the target door seal material 2 is continuously extruded.

When molded in this way, the lower half mounting portion 2a is provided with the insertion groove 20 in the connection portion between the anchor portion 8 and the tubular seal portion 10, and the upper half without the insertion groove 20 in the connection portion. The door seal material 2 integrally formed with the portion mounting portion 2b without a joint is obtained. The anchor portion 8
Is extruded and then bent into a mounting shape having a U-shaped cross section.

Further, in the above-mentioned embodiment, the movable die that enters and leaves through the extrusion opening of the basic forming die is used as a means for removing the inlet wall portion that constitutes the groove forming scheduled portion of the extrudate. The missing means in the present invention is not limited to this. For example, after the extrudate is completely extruded from the basic forming die, the inlet wall portion that constitutes the groove forming planned portion of the extrudate is cut off with a cutter-like wall cutting tool to expose the internal hollow portion. By doing so, it is possible to form an interrupted groove in the extrudate.

In addition, although the above-mentioned embodiment is one in which the present invention is applied to the molding of the door seal material, the present invention is applied to other extrudates, so that it has nothing to do with the shape of the intrusion part of the lacking means. Moreover, a groove much larger than the intruding portion can be formed intermittently in the extrudate along its longitudinal direction.

〔The invention's effect〕

According to the present invention, a groove forming scheduled portion having a hollow inside is provided in the extrudate, and the hollow portion inside is exposed by removing the inlet wall portion of the groove forming scheduled portion by the removing means. And a portion where the inlet wall of the groove forming planned portion is left as it is, are continuously and continuously extruded to expose the intermittent groove along the longitudinal direction of the extrudate. Therefore, the shape of the groove to be formed is irrelevant to the shape of the portion where the chipping means penetrates into the groove forming planned portion of the extruded product, and it is possible to form a groove larger than the portion. Therefore, it is not necessary to mold the entire groove during molding.

In addition, if the hollow portion that constitutes the groove forming planned portion provided in the extrudate is made large, the exposed groove becomes large in proportion to the hollow portion.

In particular, when the present invention is applied to the molding of the door seal material, two types of portions, that is, the portion provided with the insertion groove of the decorative member and the portion not provided with the insertion groove can be integrally formed, and Unlike the door seal material, there is no need to mold-bond two types of parts having different cross-sectional shapes, and the number of processing steps after extrusion molding is greatly reduced, which leads to a reduction in product cost.

[Brief description of drawings]

1 to 13 are views for explaining the present invention. FIG. 1 is a perspective view of an automobile door seal member 2 molded by the method of the present invention, and FIG. The front view, FIG. 3 and FIG. 4 in a state in which the door seal material 2 is bent in the shape of the peripheral edge of the door opening are II in FIG. 2 respectively.
I-III line and IV-IV line sectional view, FIG. 5 is a side view of the automobile, FIG. 6 and FIG. 7 are VI-VI line and VII-VII line sectional view of FIG. 5, respectively. FIG. 1 is a perspective view of a molding apparatus for a door seal material according to the present invention, and FIGS. 9 and 10 show a molding apparatus in a state of molding a lower half mounting portion 2a and an upper half mounting portion 2b, respectively. A front view, FIG. 11 is a sectional view taken along line XI-XI of FIG. 9, FIG. 12 is a front view of a portion of the extrusion opening 28 in the basic molding die 24, and FIG. 13 is a continuously extruded door. FIG. 3 is a plan view of a sealing material 2. 14 to 16 are views for explaining a conventional door seal member 52, and FIG. 14 shows a lower half mounting portion 52a.
A front view of a state in which the conventional door seal material 52, in which the upper half mounting portion 52b and the upper half mounting portion 52b are joined via the joining portion 54, is bent to the shape of the peripheral edge of the door opening, FIG. 15 and FIG. FIG. 14 is a sectional view taken along line XV-XV and line XVI-XVI in FIG. 14, respectively. The explanation of the reference numerals of the main parts constituting the present invention is as follows. 2: Door seal material (extrudate) 4: Door frame (automobile frame) 8: Anchor part 10: Tubular seal part (seal part) 15: Decorative member, 16: End of decorative member 17: Insert groove forming part ( 18: Inlet wall of planned insertion groove forming part 19: Hollow part of planned insertion groove forming part 20: Insertion groove (groove) 21: Door 24: Basic forming die, 26: Movable die (missing means) 28: Extrusion opening

Claims (9)

[Claims] 1. A method of continuously extruding an extrudate having an interrupted groove along a longitudinal direction from a basic forming die, wherein a groove forming part having a hollow inside is provided in the extrudate. In addition, by removing the inlet wall portion of the groove forming planned portion by the removing means, the internal hollow portion is exposed and the groove is formed, and the inlet wall portion of the groove forming planned portion is left as it is. The continuous molding method of an extrudate having an interrupted groove along the longitudinal direction, characterized in that a groove interrupted along the longitudinal direction of the extrudate is exposed by alternately and continuously extruding the above-mentioned portion. 2. The removing means is a movable die that enters and leaves the extrusion opening of the basic molding die, and the shape of the extrusion opening is partially changed by the movable die, Grooves that are continuously extruded from the basic molding die are provided in the groove to be formed in the groove. The continuous molding method of an extrudate having an interrupted groove along the longitudinal direction according to claim 1, wherein 3. The wall-cutting tool, wherein the lacking means is a wall-cutting tool that is inserted into and removed from a groove-forming planned portion of an extrudate continuously extruded from an extrusion opening of a basic molding die. 2. The intermittent wall of the groove forming part is intermittently cut by the above to expose the inner hollow part, thereby exposing the intermittent groove along the longitudinal direction of the extrudate. A method for continuously molding an extrudate having an interrupted groove along the longitudinal direction according to. 4. The extruded product having an interrupted groove along the longitudinal direction according to claim 1, wherein the interrupted groove is a groove for inserting and attaching another member. Continuous molding method. 5. The extrudate is provided with an anchor portion for attaching to another member over the entire length thereof, along the longitudinal direction according to any one of claims 1 to 3. And continuous forming method of extrudate having intermittent grooves. 6. A method of continuously extruding an extrudate having an interrupted groove along a longitudinal direction from a basic forming die, the extrudate being in contact with an anchor portion attached to an automobile frame and a door. The extrudate is provided with a groove forming planned part having a hollow inside, which is composed of a seal part, and the hollow part inside is exposed by removing the inlet wall part of the groove forming planned part by the notifying means. To insert the end of the member for decorating the interior of the vehicle by alternately and continuously extruding the part where the groove is formed and the part where the inlet wall of the planned groove forming part is left as it is. The method for continuously forming an extrudate having an interrupted groove along the longitudinal direction, characterized in that the groove is exposed intermittently along the longitudinal direction of the extruded product. 7. The method for continuously molding an extrudate having an interrupted groove along the longitudinal direction according to claim 6, wherein the seal portion is tubular. 8. The continuous extrudate having an interrupted groove along the longitudinal direction according to claim 6, wherein the groove forming planned portion is provided at a connecting portion between the anchor portion and the seal portion. Molding method. 9. The interrupting means along the longitudinal direction according to any one of claims 6 to 8, wherein the lacking means is a movable die that enters and leaves the extrusion opening of the basic forming die. A continuous molding method of an extrudate having grooves.