JPH10296831A - Mold for weatherstrip and molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for adhering by forming a partition wall corre sponding part continued to a partition wall of an extrusion molded part even at a molding part, and reducing a core cavity. SOLUTION: This mold 50 comprises, in addition to an upper mold 52, a lower mold 54, an intermediate mold 56 and a slide mold 58, a first core box 62 and a second core box 64 constituted separately. Core supports 68, 62 of the first and second core boxes 62, 64 are separated and placed on support surfaces 54a, 54b of the mold 54 so that core cavities of the core boxes 62, 64 are formed at different positions of weatherstrips. At the time of mold clamping, a gap for forming partition wall corresponding part continued to partition wall of both extrusion molding parts is formed between opposed mold surfaces of the first and second core boxes 62, 64.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die and a molding method for a weatherstrip such as a door weatherstrip or a trunk weatherstrip of an automobile.
In particular, the present invention relates to a molding die for molding a hollow molded portion so as to connect terminals of an extruded portion having a plurality of hollow portions partitioned by partition walls.

[0002]

2. Description of the Related Art As shown in FIG. 7, a weather strip 10 mounted on a side door opening of an automobile generally has two extruded portions 12 and 14 formed by molding a terminal corresponding to a corner portion. The portions 16 are connected by molding. Here, the interior of the hollow seal portion 12a of the extruded portion 12 is divided into two hollow portions 12b by a columnar partition wall 12b for increasing a reaction force against an external force.
Similarly, the inside of the hollow seal portion 14a of the extruded portion 14 is divided into two hollow portions 14c and 14d by a partition wall 14b. Note that reference numerals L1 and L2 indicate the joining surfaces of the extruded portions 12, 14 and the molded portion 16, respectively.

[0003] In molding the molded part 16, a molding die 18 as shown in FIG. 8 is used, for example. The molding die 18 is provided with a core die 20 in order to obtain a hollow cross-sectional shape also in the molding part 16. Core type 20 is
A rod-shaped core portion 22 bent substantially in an L-shape is mainly used, and a substantially L-shaped flat plate-shaped core support portion 24 is formed on the outer peripheral side of the core portion 22. . Two projections 26b and 26c are formed on one end 26 of the core 22 by forming a slit 26a. Similarly, two projections 28b and 26c are formed on the other end 28 of the core 22 by forming a slit 28a. 28c are formed separately.

The protrusions 26b and 26c formed at one end 26 of the core 22 are fitted into the hollow portions 12c and 12d of the one extruded portion 12, respectively, and the protrusions formed at the other end 28 are formed. With the cores 28b and 28c fitted in the hollow parts 14c and 14d of the other extruded part 14, the core support part 24 of the core mold 20 is placed on the support surface 30a of the lower mold 30. After the support portion 24 is sandwiched between the support surface 30a and the upper mold (not shown), the core mold 20 is disposed in the cavity, and after the unvulcanized rubber is injected into the cavity,
By the vulcanization, a molded part 16 connecting the two extruded parts 12, 14 is formed.

As shown in FIG. 9, one hollow corresponding portion 32 is formed by the core portion 22 and the hollow corresponding portion 3 is formed by the core support portion 24 in the molded portion 16 after the molding.
A core punching hole 34 communicating with the inside 2 is formed in a substantially L-shape, and the core portion 22 is drawn out of the molded product using the core punching hole 34.

[0006]

In the weather strip 10 formed as described above, since no partition wall exists inside the molded portion 16, a reaction force against an external force in the molded portion 16 is reduced. Extruded part 1 with partition wall
There is a problem that it becomes weaker as compared with 2,14.

Therefore, conventionally, after molding, the core hole 3
4 is used to insert a spacer (not shown) for retaining the shape into the hollow corresponding portion 32 in the molded portion 16 and then the core hole 34 is adhered. There is a problem that the number of man-hours increases. Further, the molded part 16 in which the spacer is inserted and the partition walls 12b, 14b
Since the shape of the deformation differs between the extruded portions 12 and 14 in which the extruded portions exist, problems such as breakage are likely to occur near the joining surfaces L1 and L2 between the extruded portions 12 and 14 and the molded portion 16, for example.

[0008]

SUMMARY OF THE INVENTION Accordingly, the invention of claim 1 is to provide a hollow section so that terminals of two extruded sections having a first hollow section and a second hollow section defined by a partition are connected to each other. In a molding die of a weather strip for molding a molded portion having a first core portion, both ends of which are respectively fitted into first hollow portions of both extruded portions, A first core mold having a second core mold separately fitted into the hollow portion and being clamped so as to form a partition corresponding portion continuous with the partition walls of both extrusion molding portions in the molding portion. A gap is formed between the mold faces of the first and second core molds facing each other.

According to a second aspect of the present invention, each of the first and second core molds includes a rod-shaped core portion and a plate-shaped core support portion formed on a side of the core portion. It is characterized in that both core support portions are arranged apart from each other at the time of mold clamping, so that core punch holes formed in the mold forming portion by each core support portion are formed at different positions. And

According to a third aspect of the present invention, the molded portion is formed in a substantially L shape having a first side along one extruded portion and a second side along the other extruded portion. , The first,
One of the core punch holes of the second core type is formed along the first side, and the other is formed along the second side.

According to a fourth aspect of the present invention, a projection protruding toward the opposed mold surface is formed on one of the mold surfaces of the first and second core molds and the mold surface opposed thereto. It is characterized by.

According to a fifth aspect of the present invention, a molded portion having a hollow portion is formed so as to connect terminals of two extruded portions having a first hollow portion and a second hollow portion defined by a partition. In the method for forming a weather strip, both ends of a first core of a molding die are respectively fitted into first hollow portions of both extruded portions, and a second core configured separately from the first core. When the mold is clamped in a state where both ends of the mold are respectively fitted in the second hollow portions of both the extruded portions, the two extruded portions are provided between the opposing mold surfaces of the first core mold and the second core mold. A gap for forming a partition-corresponding portion which is continuous with the partition is formed.

[0013]

According to the first or fifth aspect of the present invention, since the partition wall corresponding portion that is continuous with the partition wall of the extrusion molding portion is formed in the molding portion, the molding portion also has the same structure as the extrusion molding portion. An appropriate reaction force against external force can be obtained. As a result, when compared with a conventional product in which a spacer is inserted after molding, the production becomes easier, and the deformation mode of the both is uniformized in the molded part and the extruded part, and the vicinity of the joint surface between the two is obtained. No troubles such as breakage and piercing occur.

According to the second aspect of the present invention, a plurality of core holes are formed corresponding to the plurality of core types, and each core hole is formed at a different position of the weather strip. In addition, each core hole can be made small to the extent that it is not necessary to bond it after molding, and its manufacture becomes easy. Also,
According to the present invention, since there is no need to insert a spacer, the core punching hole can be set to the minimum size required for removing the core die.

According to the third aspect of the present invention, since each core hole is formed along each side of the substantially L-shaped die forming portion, the bonding process is performed after the core hole is formed. The core type can be extracted relatively easily while keeping the core size small enough to eliminate the necessity.

According to the fourth aspect of the present invention, the gap between the opposing mold faces is maintained at a predetermined width by the projections abutting against the opposing mold faces during mold clamping, and the mold formed in this gap is provided. The thickness of the molded portion can be made substantially constant. In addition, the projection can prevent the core from being excessively deformed. The protrusions have such a size and number that they do not make it difficult to remove the core.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a weather strip molding die to be mounted on a side door opening of an automobile will be described in detail with reference to the drawings.

FIG. 5 shows a weather strip 40 formed by using a molding die according to the present embodiment. The weatherstrip 40 connects the terminals of a horizontal extruded portion 42 attached to a substantially horizontal portion of the door opening and a vertical extruded portion 44 attached to a substantially vertical portion of the door opening to the door. A substantially L-shaped molded part 46 to be attached to the corner of the opening is integrally connected by molding.

Reference numerals L3 and L4 in the figure denote joining surfaces of the extruded portions 42 and 44 and the molded portion 46, respectively, and reference numeral (H) denotes a horizontal side where the horizontal extruded portion 42 is located, and reference numeral (V) shows the vertical side where the vertical extrusion part 44 is located.

The extruded portion 42 has a structure in which a hollow seal portion 42b pressed against the door is integrally formed on the inner peripheral side of the mounting base portion 42a. The inside of the hollow seal portion 42b
A columnar partition wall 42c is formed to increase a reaction force against an external force, and is partitioned into a first hollow portion 42d and a second hollow portion 42e by the partition wall 42c. Similarly, in the vertical extruded portion 44, a hollow seal portion 44b is formed on the inner peripheral side of the mounting base portion 44a, and the inside of the hollow seal portion 44b is
The first hollow portion 44d and the second hollow portion 44 are formed by the partition wall 44c.
e. The first and second extruded parts 4
2, 44 have slightly different cross-sectional shapes,
Each is extruded separately.

The molded part 46 is formed in a substantially L-shape having a horizontal side part 46A extending along the horizontal extrusion part 42 and a vertical side part 46B extending along the vertical extrusion part 44. More specifically, a base corresponding portion 46a continuous with the mounting bases 42a, 44a of the extruded portions 42, 44 and a hollow seal corresponding portion 46b continuous with the hollow seal portions 42b, 44b are substantially L-shaped over the entire length in the longitudinal direction. It is formed in an extended shape.

FIG. 1 is an exploded perspective view showing a molding die 50 for the weather strip 40. The left side of the figure is a horizontal side (H), and the right side is a vertical side (V). The molding die 50 includes an upper die 52, a lower die 54, a middle die 56 located therebetween, a slide die 58 slidable in an inner circumferential direction (downward in the figure), and a hollow The first and second core molds 62 and 64, each of which forms a portion, are roughly composed of a first core mold 62 and a second core mold 64.
A letter-shaped cavity is formed.

The first core mold 62 has a rod-shaped core portion 66 bent substantially in an L-shape, and a plate-shaped core support portion 68 formed on the outer peripheral side of the core portion 66. The end of the core portion 66 on the horizontal side (H) is the first hollow portion 42 of the horizontal extrusion molding portion 42.
d, and the end on the vertical side (V) is fitted into the first hollow portion 44d of the vertical extrusion portion 44. On the other hand, the second core mold 64 has a rod-shaped core portion 70 bent substantially in an L shape, and a flat plate-shaped core support portion 72 formed on the outer peripheral side of the core portion. The end on the horizontal side (H) of the core 70 is the second hollow portion 42 e of the horizontal extrusion molding portion 42.
And the end of the vertical side (V) is
4 is fitted in the second hollow portion 44e. In addition, each core part 66, 70 is required
Is formed to be longer than the length, and the portions extending from the joining surfaces L3, L4 are fitted into the hollow portions of the extruded portions 42, 44.

The core support portion 68 of the first core mold 62 is formed as shown in FIG.
As shown in FIG. 5, the core support portion 72 is sandwiched between the support surface 54a of the lower die 54 and the upper die 52, while the core support portion 72 of the second core die 64 is provided.
Is held between the support surface 54b of the lower mold 54 and the middle mold 56 as shown in FIG. Thinned necks 68a, 72a are formed on the root side of the core support portions 68, 72. The necks 68a, 72a allow the cores as shown in FIG. Holes 48A, 48
B is formed.

Here, the core support portion 68 of the first core mold 62 is provided.
Is formed along the horizontal (H) side of the core portion 66, while the core support portion 72 of the second core mold 64 is
0 is formed along the side of the vertical side (V). Therefore, when the core support portions 68, 72 are placed on the support surfaces 54a, 54b of the lower mold 54, respectively,
Are separated from each other in the horizontal direction and are also offset in the vertical direction.

The upper surface of the lower mold 54 is provided with two support surfaces 54.
A partition piece 54c is formed so as to partition between a and 54b.

FIGS. 2, 3 and 4 are cross-sectional views showing a state in which the molding die 50 is clamped.
It corresponds to the portion along the line BB and the line CC. At the time of mold clamping, the outer surfaces of the molded part 46 are formed by the mold surfaces of the upper mold 52, the lower mold 54, the middle mold 56, and the slide mold 58. The slide die 58 has its die surface mainly forming the outer surface of the hollow seal corresponding portion 46b. When the upper die 52 and the middle die 56 are removed, the slide die 58 retreats in the inner circumferential direction along the upper surface of the lower die 54. It is possible.

As shown in FIGS. 1 to 4, the mold face of the first core mold 62 facing the mold face of the second core mold 64 has a total of 3
Similarly, a total of three protrusions 76 are formed at intervals on the mold surface of the lower mold 54 facing the mold surface of the first core mold 62. I have.
The projections 74 and 76 support the cores 66 and 70 so as to prevent the core molds 62 and 64 from being deformed by the material injection pressure, and secure a constant width gap between the opposing mold surfaces. It has become. In addition, each protrusion 74, 76
The size and number of the cores 62 and 64 are such that the core dies 62 and 64 are not forced when being pulled out from the molded product.

In the present embodiment, a middle mold 56 is used separately from the upper mold 52. However, as shown in FIGS.
In order to prevent the upper mold 52 from being disturbed.

Next, the molding die 5 configured as described above
The operation when molding the molded part 46 using 0 will be described. First, the first hollow portions 42d and 44d of the extruded portions 42 and 44 are fitted to both ends of the core portion 66 of the first core mold 62, and both ends of the core portion 66 of the second core mold 64. In the state where the second hollow portions 42e, 44e of the extruded portions 42, 44 are fitted to the core portions, the respective core supporting portions 68, 72 are connected to the lower mold 5 respectively.
4 on the support surfaces 54a and 54b.

Next, the middle die 56 is placed on the core support portion 72 of the second core die 64, and the upper die 52 is set from above.
The whole is clamped together with the slide mold 58. In this state, as shown in FIGS. 2 to 4, a gap is formed between the opposing mold surfaces of the first core mold 62 and the second core mold 64 to form the partition wall corresponding portion 46 c in the molded portion 46. The gap is maintained at a predetermined constant width in the plane direction by a projection 74 formed on the first core mold 62. Similarly, the gap between the lower mold 54 and the first core mold 62 is maintained at a predetermined width by the protrusion 76 formed on the lower mold 54.

Next, after the softened rubber material is injected into the cavities remaining around the core portions 66 and 70, the molded portion 46 is formed by vulcanization, and both ends of the molded portion 46 are extruded. It is joined to the end surfaces of the moldings 42 and 44.

At this time, the molded part 46 molded is
A hollow portion communicating with the first hollow portions 42d, 44d of the first and second extruded portions 42, 44 is formed by the core portion 66 of the first core mold 62, and the hollow portion of the second core mold 64 is formed. The core 70 forms a hollow portion communicating with the second hollow portions 42e, 44e of the first and second extruded portions 42, 44. The gap formed between the opposing mold surfaces of the core portions 66, 70 allows the partition walls 4 of both the extruded portions 42, 44 to be formed.
A columnar partition wall corresponding portion 46c continuous to 2c and 44c is formed.

Further, the core support portion 68 of the first core mold 62 is provided.
As shown in FIG. 6, the neck 68a formed at
A slit-shaped core hole 48A is formed on the outer peripheral side of the molded portion 46 along the horizontal side portion 46A, and a neck formed on the core support portion 72 of the second core mold 64. The slit-shaped core hole 48B is formed along the vertical side portion 46B on the outer peripheral side of the molded portion 46 by the 72a. That is, these core punch holes 48A, 48
B is formed at a position offset from each other in the horizontal direction and the vertical direction, and a connecting portion 48C without core holes 48A and 48B is present at a corner on the outer peripheral side of the molded portion 46.

Next, the mold is opened, and the molded product is taken out. In this case, first, the upper mold 52, the middle mold 5
After removing 6 and moving the slide die 58 to the inner peripheral side, the first core die 62 is pulled out from the core punch hole 48A, and the second core die 64 is pulled out from the core punch hole 48B. At this time, since the core removal holes 48A and 48B are formed over substantially the entire lengths of the horizontal side portions 46A and the vertical side portions 46B in the molded portion 46, the core removal holes 48A and 48B can be removed relatively easily. There is no possibility that the holes 48A and 48B will be forced to crack.

In the weather strip 40 formed as described above, the molded part 46 is formed by the extruded parts 42 and 4.
4 and is smoothly connected, resulting in excellent appearance quality.
The molding part 46 is connected to the extrusion part 42,
44, that is, a partition wall corresponding portion 46c corresponding to the partition walls 42c, 44c of both the extruded portions 42, 44 is formed in the molded portion 46, so that an appropriate reaction force against external force is extruded. It is provided uniformly from the forming parts 42 and 44 to the forming part 46. As a result, the manufacturing process is simplified as compared with the conventional example in which a spacer is inserted into the molded part 46 after molding, and the deformation from the extruded parts 42, 44 to the molded part 46 is achieved. Since the mode is made uniform, problems such as breakage and piercing do not occur near the joining surfaces L3 and L4.

Since there is no need to insert a spacer after molding, the core holes 48A and 48B can be set smaller than in the prior art.
2 and 64 are formed at different positions from each other.
6 are formed along the horizontal side portion 46A and the vertical side portion 46B, respectively, so that the core holes 48A and 48B can be made sufficiently small so that it is not necessary to perform an adhesive treatment later. As a result, the bonding process becomes unnecessary and the production becomes easy, and the quality is improved.

The present invention is not limited to one having two hollow portions as in the above embodiment, but can be similarly applied to a weather strip partitioned into a larger number of hollow portions.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a molding die according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line A- in FIG.
Sectional drawing corresponding to line A.

FIG. 3 shows the molding die of FIG. 1 in a clamped state, and FIG.
Sectional drawing corresponding to line B.

4 shows the molding die of FIG. 1 in a clamped state, FIG.
Sectional view corresponding to line C.

FIG. 5 is a perspective view of a weather strip formed by using the forming die of FIG. 1 as viewed from an inner peripheral side.

FIG. 6 is a perspective view of a molding portion of a weather strip molded using the molding die of FIG. 1 as viewed from an outer peripheral side.

FIG. 7 is a perspective view of a weather strip formed using the conventional forming die shown in FIG. 8 as viewed from an inner peripheral side.

FIG. 8 is an exploded perspective view showing a conventional molding die.

9 is a perspective view of a molded portion of a weather strip molded using the molding die of FIG. 8 as viewed from an outer peripheral side.

[Explanation of symbols]

 40 ... weather strips 42, 44 ... extrusion parts 42c, 44c ... partition walls 42d, 44d ... first hollow parts 42e, 44e ... second hollow parts 46 ... molded parts 46A ... horizontal side parts 46B ... vertical side parts 46c ... Partition-corresponding portions 48A, 48B Core punching hole 50 Molding die 62 First core die 64 Second core die 66, 70 Core portions 68, 72 Core support portions 74, 76 Projection Department

Claims (5)

[Claims] 1. A weather strip for forming a molded portion having a hollow portion so as to connect terminals of two extruded portions having a first hollow portion and a second hollow portion defined by a partition wall. In the molding die, a first core mold whose both ends are respectively fitted into the first hollow portions of both extrusion molding portions, and a second core mold whose both ends are respectively fitted into the second hollow portions of both extrusion molding portions. Mold surfaces facing each other of the first core mold and the second core mold clamped so as to form a partition corresponding portion continuous with the partition walls of both the extruded portions in the molded portion. A molding die for a weather strip, wherein a gap is formed between the molding strips. 2. Each of the first and second core molds has a rod-shaped core portion and a flat plate-shaped core support portion formed on a side portion of the core portion. The two core support portions are arranged apart from each other at the time of mold clamping, such that core punch holes formed in the molded portion by the portions are formed at different positions from each other. Mold for weatherstrip. 3. The molded part is formed in a substantially L-shape having a first side part along one extruded part and a second side part along the other extruded part. One of the core punch holes of the second core type is formed along the first side, and the other is the second core punch hole.
The mold for forming a weatherstrip according to claim 2, wherein the mold is formed along the side. 4. A projection protruding toward the opposed mold surface is formed on one of the mold surfaces of the first and second core molds and the mold surface facing the mold surface. Item 1
A molding die for a weather strip according to any one of claims 1 to 3. 5. A weather strip forming method for forming a molded portion having a hollow portion so as to connect terminals of two extruded portions having a first hollow portion and a second hollow portion defined by a partition wall. In the above, both ends of the first core mold of the molding die are respectively fitted into the first hollow portions of both the extruded portions, and both ends of the second core mold formed separately from the first core mold are connected to both ends. When the mold is clamped while being fitted into the second hollow portions of the extruded portion, the first
Forming a gap corresponding to a partition wall corresponding to the partition wall of both extruded portions, between the mold surfaces of the core mold and the second core mold facing each other; Method.