JPH037495B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a mold for forming a glass run installed in windows of automobiles and the like.

(Prior Art) Conventionally, there is a method for producing glass run that includes the following steps.

(b) Once a long article having the same cross-sectional shape as the glass run is manufactured from a rubber composition, the long article is cut into a predetermined length so that the tips of the seal lips 81 approach each other as shown in FIG. A process of manufacturing a non-corner member 60 for manufacturing a glass run.

(b) As shown in FIG. 7, the two non-corner members 60 are inserted into both ends of the tunnel-shaped cavity 53 formed in the mold 55, and the two non-corner members 60 are inserted between the two ends within the cavity 53. A connection molding process in which a rubber composition is injected to connect the two ends of the non-corner member 60 and at the same time form a corner part of a predetermined shape.

By the above method, a glass run 80 is obtained in which the corner portions 70 are connected to both ends of the non-corner member 60, as shown by the solid line in FIG.

(Problems to be Solved by the Invention) However, when trying to attach the glass run 80 manufactured by the above method to the window of a vehicle, in order to maintain good sealing performance of the seal lip 81 against the glass, the eighth As shown by the two-dot chain line in the figure, the sides of the glass run 80 must be brought inward so that the ends of the seal lips 81 approach each other, and the cross-sectional shape of the long object (see Figure 6) must be restored. . Then, a triangular bulge 7 bulges outward at the side of the corner portion 70 of the glass run 80.
1, resulting in problems such as poor appearance of the glass run 80 and poor sealing performance of the seal lip 81 against the glass (not shown).

Therefore, the present inventors investigated the cause of the above problem and found that this problem was caused by the structure of the glass run mold and the corner portion 7 formed due to the structure.
It turned out that the cause was the shape of 0.

Specifically, as shown in FIG. 7, the mold 55 includes a roof-shaped lower mold 51 having a curvature R that is almost the same as that of the corner portion 70, an upper mold 52 stacked on top of the roof-shaped lower mold 51, and the two aforementioned molds. The core 54 is inserted into a cavity 53 formed between the molds 51 and 52 and has a substantially T-shaped cross section.

As shown in FIG. 9, the core 54 is formed of a main body part 54a that maintains the inner shape of the glass run 80, and a spigot part 54b having an I-shaped cross section that supports the main body part 54a at the lower center of the main body part 54a. The portion 54b is a holding groove 56 formed in the lower die 51.
is inserted into.

In order to maintain the strength of the core 54,
The thickness D of the pilot part 54b is, for example, 5 to 10 mm.
It is greatly formed.

Therefore, the cavity 5 in the mold 55
3, the distance L between the tips of the portion 53a where the seal lip 81 is molded (hereinafter referred to as the seal lip molded portion) must be increased.

When a glass run 80 is obtained using the mold 55 in which the distance L is increased, the distance C between the two seal lips 81 in the glass run 80 becomes larger as shown in FIG.

When the glass run 80 with the large gap C is assembled into a window as is, the shapes of both sides are restored so that the tips of the seal lips 81 in the non-corner portions 60 approach each other as shown by the two-dot chain line in FIG. At this time, the corner portion 70 of the glass run 80
A triangular bulge 71 is formed.

The object of the present invention is to provide a mold for molding a glass run in which this bulge 71 does not occur.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a mold for molding a glass run having a tunnel-like cavity, in which both ends of the cavity are connected to non-contact parts of the glass run. The end portions of the two non-corner members serving as the corner portions are inserted into insertion portions, and the space between the two insertion portions is a connection molding portion for forming the corner portion of the glass run, and further, The interval between the two seal lip molding parts where the seal lip is molded among the connection molding parts is
Among the insertion parts, a mold is adopted in which the seal lip of the non-corner member is smaller than the distance between the two seal lip insertion parts.

(Function) Since the distance between the two seal lip molded portions in which the seal lip is formed in the connection molded portion is smaller than the distance between the two seal lip insertion portions in which the seal lip of the non-corner member is inserted into the insertion portion, the glass run The distance between the two sealing lips in the corner portion obtained using the molding die is smaller than the distance between the two sealing lips in the non-corner member.

Therefore, when assembling the glass run to the window, it is not necessary to bring the two sealing lips at the corner portion close to each other, but only the two sealing lips at the non-corner member need to come close to each other. Even if only the seal lips of the non-corner members are brought close to each other, no bulging occurs on the outer side of the corner portion.

(Example) Next, an example embodying the present invention is shown in Figs.
This will be explained based on FIG.

As shown in FIG. 1, the mold 5 of this embodiment includes a lower mold 1 having a roof-shaped upper surface, an upper mold 2 having a lower surface that can be overlapped with the upper surface of the lower mold 1, and the lower mold 1. 1 and an upper mold 2, and a core 4 set within the cavity 3.

Vertical guide pins 7 are implanted in at least two corners of the upper surface of the lower mold 1, and these guide pins 7 are used as guide members to pass through guide holes 8 transparently provided in the upper mold 2. It is now possible to stack the upper mold 2 on the lower mold 1.

The cavity 3 is located in the center of the upper mold 2.
A cylindrical injection pot 2a for injecting a glass run forming raw material such as an EPDM rubber composition is formed above, and a gate communicating with the cavity 3 is provided at the center of the bottom surface of the injection pot 2a. 2b is formed.

A plunger 9 is set in the injection pot 2a so as to be movable up and down, so that the glass run forming raw material injected into the injection pot 2a can be injected into the cavity 3.

The cavity 3 has an insertion part A for inserting the end of the non-corner member 10 from the front and rear of the mold 5;
It consists of a connection molding part B for molding the corner part of the glass run between the two insertion parts A. Note that the non-corner member 10 is an extruded member used for parts other than the corner parts of an endless glass run, and has a cross-sectional shape of a glass run, and is straight or gently curved. It means a member that has a shape.

As shown in FIG. 3, the cross section of the insertion portion A has approximately the same size and shape as the conventional cavity 53, and there are two seal lip insertion portions 3a into which the seal lips 31 of the non-corner member 10 are inserted. The distance N is the same as the distance L between the seal lip insertion portions 53a in the prior art.

However, in the connecting molded part B, the interval M between the two seal lip molded parts 3b where the seal lip 3 is formed is smaller than the interval N between the two seal lip insertion parts 3a (first to third
figure). Therefore, the cavity 3 gradually becomes thinner from the insertion part A to the connection molding part B.

Further, the cavity 3 has a cross-sectional shape of approximately T.
A character-shaped center core 4 is set, and both ends thereof slightly protrude from the front and rear sides of the mold 5 to facilitate insertion of the non-corner member 10 into the insertion portion A.

This core 4 includes a main body portion 4a having the same shape as the inner cross-sectional shape of the glass run 30, and a main body portion 4a having the same shape as the inner cross-sectional shape of the glass run 30.
The spigot part 4b has an I-shaped cross section and supports the central part of the lower mold 1. There is.

The center core 4, especially the spigot part 4b in the connection molding part B of the spigot part 4b is connected to the insertion part A.
It is thinner than the spigot part 4b in . Therefore, in the cavity 3, the distance M between the two seal lip molded portions 3b is smaller than the distance N between the two seal lip insertion portions 3a, and is usually 3 mm or less.

Next, the functions and effects of this embodiment will be described.

First, a long product (not shown) is manufactured by extruding and vulcanizing the raw material for forming a glass run using a known method, and the length of the long product is adjusted to match the length of the non-corner member 10 of the intended glass run 30. disconnect.

Next, the upper mold 2 is stacked on the lower mold 1 on which the core 4 is set while being guided by the guide pin 7, and the mold is clamped. Heat.

The ends of the non-corner member 10 are inserted into each of the both ends of the cavity 3 in the mold 1, and the mold 5 is connected to form a space surrounded by both ends of the non-corner member 10 and the cavity 3. Part B
form.

Next, an EPDM rubber composition is injected into the injection pot 2a of the upper mold 2, the plunger 9 is lowered, and the EPDM rubber composition is injected into the connection molding part B through the gate 2b.

The EPDM rubber composition injected into the connection molding part B reaches both ends of the non-corner member 10 and vulcanizes and bonds the ends, and at the same time a corner part is molded between both ends.

When the molded product is taken out from the mold 5, a molded product is obtained in which one corner portion 20 is molded at both ends of the non-corner member 10, as shown by the solid line in FIG. In this molded product, the distance E between the two seal lips 31 in the non-corner member 10 is large, similar to the conventional glass run 80, but the corner portion 2
The distance between the two seal lips 31 at 0 is equal to or less than the thickness of the glass of the window to which the glass run 30 is attached.

Therefore, it is not necessary to deform both ends of the corner part 10 inward, and only the both sides of the non-corner member 10 need only be brought inward and restored as shown by the two-dot chain line in FIG. Even if the latter is restored inwardly, unlike the conventional glass run 80, no bulging occurs on the sides of the corner portion 20. Therefore, the appearance of the corner portion 20 of the glass run 30 obtained in this example is not impaired, and the seal lip 31 is
The sealability against the glass is maintained well.

Moreover, the spigot part 4 of the center core 4 in the insertion part A
Since the thickness of b is as large as the spigot part 54b of the conventional core 54, there is almost no decrease in the strength of the core 4.

Above, we have described the case of connecting and molding one corner part between two non-corner parts. Alternatively, the same functions and effects as described above can be obtained even when the endless glass run 30 is completed by connecting and molding different corner parts 20 to both ends of two non-corner members 10.

This invention is not limited to the above embodiments, but
As long as the technical idea of the present invention is followed, the present invention can be implemented, for example, in the following manner.

(1) As shown in FIG. 5, the center core 4 of the connection molding part B in the cavity 3 can be formed only from the main body part 4a, and the spigot part 4b can be omitted.
Even if the spigot part 4b of only the connection molding part B is omitted, the spigot part 4 is not included in the core 4 of the insertion part A.
b is provided, the strength of the core 4 and the set position of the main body portion 4a are sufficiently maintained. In this case, the connection molding part B of the lower mold 1
It is possible to omit the holding groove 6 in the portion where it is formed.

(2) The distance M between the two seal lip molded parts 3b in the connection molded part B is 3 mm or less, preferably 1 to 3 mm.
It is 2.5mm or less. If the distance M exceeds 3 mm, bulges tend to occur on the sides of the corner portions 20.

Furthermore, in some cases, the distance M can be reduced to almost zero as long as the tips of the seal lips 31 do not come into contact with each other. In this case as well, the spigot part 4b can be omitted.

(3) As a molding raw material for molding the glass run 30, in addition to a rubber composition, a flexible synthetic resin such as polyvinyl chloride resin is used.

Effects of the Invention As detailed above, the present invention exhibits the excellent effect of being able to connect and mold the corner portions without forming lateral bulges between both ends of the non-corner members of the glass run. As a result, the present invention makes it possible to maintain good appearance of the glass run and good sealing performance against the glass.

[Brief explanation of the drawing]

1 to 5 are drawings according to the present invention, where FIG. 1 is a partially cutaway perspective view of an embodiment, FIG. 2 is a cross-sectional view of the connection molding part, FIG. 3 is a cross-sectional view of the insertion part, and FIG. The figure is a partial perspective view of a grass run obtained in an example.
FIG. 5 is a cross-sectional view showing another aspect of the connection molding part;
6 to 10 are drawings according to the prior art, where FIG. 6 is a partial perspective view of a non-corner member, FIG. 7 is a partially cutaway perspective view of a mold according to the prior art, and FIG. FIG. 9 is a cross-sectional view of an insertion portion in the prior art, and FIG. 10 is a partial perspective view of a non-corner portion of the glass run obtained in the prior art. Cavity...3, Seal lip insertion part...3
a, Seal lip molding part...3b, Glass run molding mold...5, Non-corner member...10, Corner part...20, Seal lip...31, Insertion part...
A. Connection molding part... B. Spacing... M. Spacing...
N.

Claims (1)

[Scope of Claims] 1. In a glass run molding mold 5 having a tunnel-shaped cavity 3, both ends of the cavity 3 are provided with two non-corner members 1 which become non-corner parts of the glass run 30.
The end of the glass run 30 is the insertion part A, and the corner part 2 of the glass run 30 is inserted between the two insertion parts A.
0, and furthermore, two seal lip forming parts 3b in which seal lips 31 are formed in the connecting forming part B.
The distance M between the non-corner members 1 of the insertion portion A is
A mold for molding a glass run, characterized in that the gap is smaller than the distance N between two seal lip insertion portions 3a into which a seal lip 31 of No. 0 is inserted.