JPH049645B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for molding door weather strips, particularly corner portions thereof.

[Prior Art] The door sash of an automobile is equipped with a door weather strip that seals between the door sash and the door opening of the vehicle body.

As a door weather strip, a mounting base 3 is held on the outer periphery of the door sash 1 as shown in FIG.
1, a hollow seal portion 32 that protrudes from the base 31 and contacts the side edge 21 of the door opening of the vehicle body, and the base 3.
A weather strip 3 is used which includes a lip portion 33 extending upward from the weather strip 1 and coming into contact with the drip 22. This weather strip 3 is generally made of sponge rubber and extruded.

By the way, since sponge rubber has a rough surface and lacks luster, a solid rubber layer 330 is formed on the outer surface of the lip portion 33 that appears on the outside as a decorative surface to improve the appearance.

On the other hand, attach the weather strip 3 to the door sash 1.
If the weather strip is to be installed at a corner of the door sash 1, for example, from the rear end of the upper side to the vertical section, the cross-sectional shape will be greatly distorted if the weather strip is bent at a right angle. Formed by molding.

[Problems to be Solved by the Invention] Conventionally, as shown in FIGS. 4 and 5, the above-mentioned molding process involves forming a weather strip 3 having a lip portion 33 having a solid rubber coating layer 330 on its outer surface.
Then, each end of another weather strip 4 connected to this through a corner part is set in a mold 6 in a direction that intersects at almost a right angle, and sponge rubber is injected between the two to mold the corner part A. Ta.

However, in the corner portion A formed by this method, a clear difference in color tone appears at the boundary 5 with the lip portion 33 having the solid rubber coating layer 330, and the appearance is not good.

Therefore, as shown in FIGS. 6 and 7, the end of the weather strip 3 is cut off except for the lip portion 33 having the solid rubber coating layer 330, and the corner portion A is molded. ing. As a result, the entire design surface of the corner portion becomes a solid rubber surface, which improves the appearance.

When setting the end with the lip portion 33 remaining in the mold 6, the remaining lip portion protrudes elongately and is unstable, making positioning difficult. It is divided into 62 parts. However, even if the lip portion 33 is positioned accurately, twisting or protrusion may occur before the mold 61 is closed, and the mold 61 will be closed as it is, and the positional deviation will not be visible after the mold 61 is closed. , it often happens that molding is performed with the position shifted.

Therefore, when molding the corner portion of a weather strip in which the outer surface of the lip portion 33 is the designed surface of the solid rubber layer, the lip portion can be set in the mold easily and without misalignment, and the desired shape can be obtained. The object of the present invention is to provide a method for molding a corner portion into an accurate shape, thereby solving the problems of the conventional method.

[Means for Solving the Problems] As shown in FIGS. 1 and 2, the terminal of the weather strip 3 has a solid rubber layer 33.
0 and the band-shaped portion 34 of the lip portion 33 on the side of the base portion 31 with respect to the parting line a are left, and the other portions are removed.

Then, when setting it to mold 6, first
After positioning and fixing the strip portion 34 in step 2, mold 6
1 is closed and the corner part is molded.

[Operation and Effect] During molding, the uncut lip portion 33 is positioned and fixed by the band-like portion 34 along its root. Therefore, even if the uncut elongated lip part is twisted, it is firmly held at the base, so no deformation or displacement occurs, and the reliability of molding is greatly improved. As a result, a corner portion having a predetermined shape can be formed without variation for each product.

[Example] FIG. 1 and FIG. 2 show an example of the present invention.

The weather strip 3 is a weather strip that is attached to the door sill facing the part from the front pillar to the roof side of the automobile, and
It includes a mounting base 31, a hollow seal portion 32, and a lip portion 33.

As shown in FIG. 1, the rear end of the weather strip 3 is connected by a molded corner A to a weather strip 4 which is attached to a door frame facing the center pillar of an automobile. The weather strips 3 and 4 are extruded products of sponge rubber. A solid rubber layer 330 is formed on the outer surface of the lip portion 33 of the weather strip 3. layer 3
30 is integrally extruded with the sponge rubber main body.

When molding the corner part A, the end of the weather strip 3 is cut off except for the lip part 33 and the band-shaped part 34 on the base side along the parting line a.

Then, the cut end of the weather strip 3 and the end of the weather strip 4 are placed in a mold 6 with a cavity for forming a corner section interposed therebetween.
When setting the lip portion 33 of the weather strip 3, the strip portion 34 is fixed in an accurate position using molds 62 and 63. As a result, the lip portion 33
The whole thing is positioned. In this state, the mold 61 is installed and the mold is closed. Then, by injecting sponge rubber into the cavity, the corner portion A is molded.

Since the set state of the band-shaped portion 34 can be visually observed, accurate positioning is possible. Then, if the strip portion 34 is fixed and the mold 61 is closed,
The lip portion 33 will be set without any deviation.

Therefore, the correct position and shape of the lip portion 33 forming the design surface at the corner portion is ensured, and no defective products are produced.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a corner part of a weather strip molded according to the present invention, Fig. 2 is a sectional view of the corner part during molding, Fig. 3 is a sectional view of the weather strip in an installed state, and Figs. 4 and 5 are 4 is a perspective view of a corner portion, FIG. 5 is a cross-sectional view during corner mold molding, and FIGS. 6 and 7 are other conventional examples. 7 is a perspective view of the corner portion, and FIG. 7 is a sectional view of the corner portion during molding. 3, 4...Weather strip, 31...Seal portion, 33...Rip portion, 330...Solid rubber layer, 34...Band shaped portion, a...Parting line, A...Mold forming corner portion.

Claims (1)

[Claims] 1 Made of sponge rubber, it has a lip that extends upward from the mounting base that attaches along the door sash.
In a door weather strip in which a solid rubber layer is formed on the outer surface of the lip part to form a design surface, when molding a corner part at the end of the weather strip, the end of the weather strip is attached to the lip part and the parting line of the lip part. The removed weather strip is removed leaving a band-shaped part on the mounting base side that follows the above-mentioned band-shaped part, and the end of the removed weather strip is positioned in the above-mentioned band-shaped part and set in a mold. Sponge rubber is injected into the mold to cover the removed part and A method for forming a corner of a door weather strip, characterized by molding a corner portion connected to the door weather strip.