JPH0732012Y2 - Molding tool for weather strip connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is to connect a molding portion such as an end portion or a corner portion of a weather strip to be assembled as a sealing member to a window portion or a door portion of an automobile to an extrusion portion. The present invention relates to a molding die used for forming.

Here, the case where the end of the hollow type door sponge weather strip mounted in the front door opening of the automobile is molded will be described as an example, but the invention is not limited to this. The same applies to solid type weather strips.

<Prior Art> Molding of the above type of weather strip has been performed as shown in FIG.

The structure of the molding die is composed of an upper mold 1, a lower mold 3, and a core 5 for partially inserting the hollow part 13a of the mold molding member 13 by partially inserting it into the connection side hollow part 11a of the weather strip extruding member 11. Become.

Then, after the core 5 is partially inserted into the extruding member 11 and set in the lower mold 3, the mold is closed and an elastomer material such as a rubber material is passed through the material injection path 4 to the mold molding portion cavity 2 formed. It was injected and molded.

At this time, the extrusion pressure of the molding material causes the extruding member 11 to escape to the outside or to be compressed, and variations in molding and a defective appearance are likely to occur due to the difference between the escape amount and the compression amount.

For this reason, in the past, the escape prevention ridge 6 as shown in FIG.
This was dealt with by forming the end part of the insertion part of the core.

Although it does not affect the present invention and the invention,
Related publicly known technical documents include Japanese Patent Publication No. 55-42999.

<Problems to be Solved by the Invention> However, in the case of the mold structure described above, when the height of the protrusion 6 is increased, that is, the radial compression amount of the extruded member 11 is increased in order to increase the escape preventing effect. After molding, as shown in FIG. 5, a compression mark 15 was generated on the peripheral surface including the design surface of the extruded member 11, and a connection step 16 was generated due to compression return (leading to a poor appearance).

An object of the present invention is to provide a molding die for weatherstrip connection which can solve the above problems.

<Means for Solving the Problems> The present invention solves the above problems by a weatherstrip connecting molding die having the following configuration.

A mold used for simultaneous molding and connection of a molding member to the end of an extrusion member of a weather strip, wherein the end of the extrusion member is partially inserted into the mold in a compressed state in the thickness direction. A structure capable of forming a cavity, in a direction intersecting the connection boundary surface with a connection boundary surface sandwiched on a mold surface on the non-design surface side that compresses the design surface portion of the extruded member in the thickness direction. Is formed, and a second concavo-convex portion that extends in a direction parallel to the connection boundary surface is formed continuously on the tip side of the concavo-convex portion.

<Example> Hereinafter, the present invention will be described in detail based on an example. The same parts as those in the above-described example are designated by the same reference numerals, and the description thereof will be omitted in whole or in part.

The molding die used in this example has the same basic structure as that shown in FIG.

That is, the upper mold 1, the lower mold 3, and the weather strip extruding member 11 are partially inserted into the connection-side hollow portions 11a to form the mold forming member 1
3 and a core 5 for shaping the hollow portion 13a.

FIG. 1 is a sectional view of an essential part of the mold of this embodiment when the mold is closed, and FIG. 2 is a partially cutaway perspective view of the core 5.

In the above-mentioned mold, in this embodiment, the connection boundary surface s is sandwiched between the mold surface 8 on the non-design surface side that compresses at least the design surface portion of the extruded member 11 in the thickness direction. While the first uneven portion 8 extending in the intersecting direction is formed,
The connection boundary surface s is continuously formed on the tip side of the first uneven portion 8.
A second concave-convex portion 9 extending in a direction parallel to is formed.

Specifically, on the peripheral surface of the push-out member 5a of the core 5, a first uneven portion 8 having a cross-sectional saw blade shape that extends in a direction intersecting the connection boundary surface s with a connection boundary surface s forming portion sandwiched therebetween is formed. In addition, on the tip side of the first concavo-convex portion 8, the second concavo-convex portion 9 also having a sawtooth-shaped cross section that extends in a direction parallel to the connection boundary surface s.
Are formed. The first uneven portion 8 is mainly the extruded member.
11 exerts a compressive stress relaxation effect, and the second uneven portion 9
It mainly acts as a relief.

Further, the lengths 1 and 12 of the first concavo-convex portion 8 and the second concavo-convex portion 9 in the extending direction are usually 8 to 10 mm, and the mountain pitch p is usually 2 to 3 mm.

The free wall thickness of the extruded member material is adapted to come to a substantially intermediate height position between the peaks and the valley bottoms of the first and second uneven portions 8 and 9. The height of the peak from the valley bottom of the uneven portion is usually 1.2 to 1.6 mm.

With the above configuration, the compression cost of the conventional extruded member is 50%.
%, Even after the molding, as in the conventional example, after molding, a compression mark is generated on the peripheral surface including the design surface of the extruded member 11, or
There will be no connection step due to compression return.

The reason is that the compression action of the mold surface on the extruding member 11 is changed from a planar shape to a linear shape, and the deformation surplus at the time of compressing the extruding member enters the bottoms of the recesses 8a and 9a, so that the entire extruding Although the pulling resistance of the member 11 increases, it is considered that the local stress received by the compression is diffused due to the presence of the recess.

(2) The cross-sectional shape of the uneven portions 8 and 9 is a saw-tooth shape, but it may be a wavy shape or the like. Further, the uneven portions 8 and 9 do not necessarily have to be provided on the entire circumference, and may be only on the back surface of the portion corresponding to the design surface. In other parts, it does not matter if a compression mark is generated in a part that is not the design surface. In the example shown, the first uneven part 8 and the second uneven part 9 are formed in different parts from the viewpoint of moldability. I am doing it. If the moldability is not taken into consideration, it is also possible to form a twilled loret, a diamond cut shape, etc., in which the first unevenness portion and the second unevenness portion coexist in the same portion.

<Operation and effect of the invention> The molding die for connecting the weather strip of the present invention is a mold used for simultaneously molding and connecting the molding member to the end portion of the extruding member of the weather strip, and the end portion of the extruding member. In a mold capable of forming the cavity of the mold forming portion by partially inserting the mold in the thickness direction in a compressed state, wherein the metal of the non-design surface that compresses the design surface portion of the extruded member in the thickness direction. A first concavo-convex portion extending in a direction intersecting the connection boundary surface is formed on the mold surface, and a direction parallel to the connection boundary surface is continuous to the tip side of the concavo-convex portion. The following operation / effect is achieved by the configuration characterized in that the second concave-convex portion extending in the direction is formed.

When the extruded member is set in a mold to form a die-molded member, the first uneven portion 8 mainly exerts a compressive stress relaxing action which the extruded member 11 receives, and the second uneven portion 9 mainly has a relief preventing action. Play.

Therefore, unlike the prior art, after the molding, there is no generation of a compression mark on the peripheral surface including the design surface of the extruded member 11 and no connection step due to the compression return.

[Brief description of drawings]

1 and 2 show an example of the present invention, FIG. 1 is a partial sectional view of a mold after the extrusion member is set, and FIG. 2 is a core insertion portion (the non-design surface-shaped shaping surface) used in the present invention. ) Is a partial perspective view, FIG. 3 is a schematic cross-sectional view showing an example of a die for weatherstrip connection, and FIG. 4 is a cross-sectional view of a main part of FIG. 3 in which a retaining rib is formed on the core, and FIG. FIG. 6 is a partial cross-sectional view that remarkably illustrates the problem of a weather strip connected with a mold having the specifications shown. DESCRIPTION OF SYMBOLS 1 ... Upper mold, 2 ... Mold forming part cavity, 3 ... Lower mold, 5 ... Core, 5a ... Core extrusion member insertion part, 8 ... First uneven part, 9 ...
Second uneven portion, 11 ... Extruded member, 13 ... Molded member, s ... Connection boundary surface.

Claims (1)

[Scope of utility model registration request] 1. A mold used for simultaneous molding and connection of a molding member to an end of an extrusion member of a weather strip, wherein the end of the extruding member is partially inserted into the mold in a compressed state in a wall thickness direction. And a structure capable of forming a mold forming portion cavity, in which a connection boundary surface is sandwiched on a mold surface on the non-design surface side that compresses the design surface portion of the extruded member in the thickness direction. A first uneven portion extending in a direction intersecting with the surface is formed, and a second uneven portion extending continuously in a direction parallel to the connection boundary surface is formed continuously on the tip side of the uneven portion. Characteristic molding die for connecting to a weather strip.