JP2788969B2 - Weather strip and molding method and apparatus therefor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a weather strip in which a plurality of weather strip portions having different circumferential lengths are continuous, and a method and an apparatus for molding the same.

In this specification, the “perimeter” refers to a length along a circumferential direction in a cross section of a hollow molded article such as a weather strip.

[Conventional technology]

For example, a weatherstrip having a hollow structure is repelled by deformation in a case where a distance between a door frame and a body frame forming a door opening is partially different, or in an upper half and a lower half of a door. It is also used to increase the closing and sealing properties of doors with different forces.

In the conventional hollow article extrusion molding method, there was a molding technique that partially changed the thickness of the hollow article or partially changed the length of a protruding portion such as a lip provided on the hollow article. However, regarding the formation of weather strips having partially different circumferential lengths, two weather strip portions having different circumferential lengths are separately extruded, and the respective weather strip portions are joined using a mold.

For this reason, on the product side, the color of the extruded weather strip portion and the color of the molded portion are slightly different, and the appearance of the weather strip is impaired, or the strength of the joined portion is reduced in other portions. In some cases, the joint was damaged because of its weakness. In addition, in terms of the molding method, it is necessary to hold various types of molding dies, and it is necessary to set up the molding apparatus each time a molded product is different, so that the setup time increases,
Further, a special mold for joining the molds and a molding man-hour are required, so that molding efficiency is poor.

[Problems to be solved by the invention]

An object of the present invention is to reduce the number of molding steps and improve the quality of a molded product by continuously and integrally molding a weatherstrip in which a plurality of portions having different circumferential lengths are continuous.

[Means for solving the problem]

Means adopted by the present invention to achieve this object are:
When forming a weatherstrip having a structure in which a plurality of weatherstrips having different circumferential lengths are continuously integrated, a weatherstrip having an opening along the longitudinal direction, a part of which is broken along the circumferential direction. In the state where the active substance is continuously extruded, by the removing means,
The portion of the weatherstrip body facing the opening is removed, the width of the opening is changed at each weatherstrip section, and the width of the opening of the weatherstrip body is adjusted by the width adjustment means to adjust the width of the opening. Is to fuse the parts that are separated through the part.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to examples.

First, with reference to Figure 1 through Figure 5, describes the structure of the weather strip S ₁ according to the present invention, will be described that molding method.

As shown in FIG. 1, this weather strip S ₁
Are mounted on the inner periphery of the door frame 1 in an annular shape. As shown in FIGS. 2 to 5, the circumference of the _first weatherstrip portion S1a mounted on the upper half portion A of the door frame 1 is the second peripheral portion mounted on the lower half portion B thereof.
Is longer than the circumferential length of the weather strip portion S ₁ b, and both weather strip portions S ₁ a and S ₁ b are continuously formed integrally and connected to each other at a portion of the connection portion S ₁ c. .

The position of the vehicle body frame 2 at the cross-section indicated by lines II to IV-IV in FIG. 2 is shown in FIG. 4 with corresponding Roman numerals, and as can be understood from this, the door opening 3 Is partially different depending on the position. Correspondingly, the first and second weather strip portions S ₁ a, S ₁
b has a changed perimeter so that the position of the seal portion 22 with respect to the attachment portion 21 to the door frame 1 changes.

Incidentally, the weather strip S ₁ is for circumferential and long first weather strip portion S ₁ a of length, and a short circumferential length second weather strip portion S ₁ b is integrally formed by molding to be described later But continuously formed weather strip S ₁
Is cut into an annular shape, so that a joint 4 is provided at one location.

Next, with reference to FIG. 6 through FIG. 14 will be described a method of forming the weather strip S ₁ described above.

On the front end face of the forming die 5, a weatherstrip body S ₁ ′ having a part cut along the circumferential direction and having an opening 6 (see FIGS. 11 and 12) along the longitudinal direction is formed. (See FIG. 9).

As shown in FIG. 9, the peripheral length of the core 8 is reduced stepwise (three steps in the embodiment) along the extrusion direction. It is inserted into the provided extrusion opening 7 and protrudes from the front end face of the forming die 5 by a predetermined length. Core 8 in this example, corresponds to the shape of the weather strip S ₁ of molding, by which the width is gradually narrowed, the circumferential length becomes stepwise shorter. Reference numerals 8a and 8b denote portions of the core 8 where the perimeter changes, and the perimeter change portion 8a is located on the upstream side in the extrusion direction with respect to the perimeter 8b.

As shown in FIG. 7, FIG. 8 and FIG.
A fixed forming roller 9 and a movable forming roller 11 are provided at predetermined intervals on the sides of each of the circumferential length changing portions 8a and 8b. Movable forming roller 11 is movable along a direction perpendicular to the extrusion direction of the weather strip S _1. As shown in Figure 13 and Figure 14, the fixed forming roller 9, and the movable forming roller 11 corresponds to the shape of the forming portion in the weather strip S _1.

A cylinder 12 is attached to the front end surface of the forming die 5, and a cutter 13 is attached to a tip of a rod 12 a of the cylinder 12. Rod of cylinder 12
The out of 12a, the cutter 13 is moved in the width direction of the weather strip conformal S ₁ 'to be extruded. As shown in FIG. 9, a hole 14 is provided in the core 8 in order to avoid interference between the cutter 13 and the core 8 due to the movement of the cutter 13.

The molding state shown in FIG. 6 is a virtual state,
The original weatherstrip body S ₁ ′ is extruded as it is from the extrusion opening 7 of the forming die 5. The weatherstrip body S ₁ ′ is broken along the circumferential direction, and has an opening 6 having a width W ₁ along the pushing direction.

State shown in FIG. 7 is a molding state of the long perimeter first weather strip portion S ₁ a, the movable forming roller 11 is retracted from the molding position. Weatherstrip body S ₁ ′ extruded from extrusion opening 7 of forming die 5
Immediately after being extruded, one side part (seal part 22)
It is deformed by passing between the fixed forming roller 9 and the circumference change portion 8a of the core 8. As a result, the portion of the weatherstrip body S ₁ ′ in which the opening 6 is formed is shifted, and the portion separated via the opening 6 is fused to form the first weatherstrip portion. S ₁ a is formed (see FIG. 11).

The state shown in FIG. 8 and FIG.
In a molding state of the weather strip portion S ₁ b, the movable molding roller 11 is disposed at a regular molding position, and as shown in FIG.
The periphery of the opening 6 of the weatherstrip original S ₁ ′ extruded from the extrusion opening 7 of the forming die 5 is cut off by a predetermined width by the cutter 13, and passes through the cutter 13. The original weather strip body immediately after
The width W ₂ 'of the opening 6 of the' S ₁ is larger than the width W _1.

One side portion (seal portion 22) of the weatherstrip body S ₁ ′ having an opening 6 ′ which has been cut wide by the cutter 13 and has a widened portion, the peripheral portion of the fixed forming roller 9 and the central core 8 having a circumferential length change portion is deformed by passing between the 8a, thereby being biassing, the portion of the opening 6 the width W ₃ of "is narrowed, further followed weatherstrip conformal S ₁ 'is movable forming roller 11 and by passing between the circumferential length variation unit 8b of the center core 8, the portion which is remote through the opening 6 'is fused, a second weather strip portion S ₁ b is molded. As a result, in the second weather strip portion S ₁ b, the length of a portion of the wall forming the hollow except for the seal portion 22 is shorter than that of the _first weather strip portion S ₁ a, and Becomes shorter.

Immediately after the portion of the weatherstrip body S ₁ ′ that is separated via the opening 6 ″ is fused, the surrounding fabric is brought to the fusion portion 15 by the inclined roller 16, and then the inclined roller 16 The fusion section 15 is shaped by a shaping roller 17 provided on the downstream side, whereby the fusion section 15 is adjusted to a proper state.In FIG. This shows a cut piece of the cloth generated by cutting the peripheral portion of the opening 6 of the original body S ₁ ′.

As described above, in the molding method of the present invention, since the opening portions of the respective weatherstrip bodies having different circumferential lengths are narrowed and fused in a hollow shape, the first and second different circumferential lengths are different. weatherstrip section S ₁ a, in S ₁ b, the thickness of the wall forming the hollow is not constant and does not change.

It should be noted that the above-described molding method is merely an example of the present invention, and modifications made as described below are also included in the technical scope of the present invention.

(1) The above embodiment uses one fixed forming roller 9 and one movable forming roller 11 as the width adjusting means and the center core 8 as the width adjusting auxiliary means, and uses the weatherstrip body S ₁ ′. Is deformed twice so that the second
Although the are molded weather strip portion S ₁ b, a movable shaping roller 11 using a plurality, it is also possible to modify more than 3 times the weather strip conformal S ₁ '. In this case, three or more portions having different peripheral lengths can be integrally molded, and when two portions having different peripheral lengths are integrally molded, there is an effect when the difference between the peripheral lengths is large.

(2) In the above embodiment, when forming the _first weather strip portion S ₁ a having a long circumference, the periphery of the opening 6 of the original weather strip value S ₁ ′ is not cut off. Even in such a case, if the periphery of the opening 6 of the weatherstrip original body S ₁ ′ is cut off, the cut pieces 18 are continuous, and the processing becomes easier thereafter.

(3) If the distance between the fixed forming roller or the movable forming roller as the width-shifting means and the core as the width-shifting assisting means is smaller than the thickness of the weatherstrip body, the cloth is pressed. The quality as an extruded product is improved.

(4) formable weatherstrip is not limited to irregular rectangular cylindrical shape as in the above embodiment, there is also a weather strip S ₂ of circular tube as shown in Figure 15. The shape of the fixed forming roller and the movable forming roller, and the position of the center core on the side may be changed according to the shape of the weather strip to be formed.

〔The invention's effect〕

In the weather strip according to the first aspect of the present invention, a plurality of weather strip portions are continuously formed integrally, and each of the weather strip portions has a wall portion forming a hollow, and the wall thickness thereof is kept constant. Have the same color to improve the appearance, and increase the strength of the connection portion of the plurality of weather strip portions having different peripheral lengths, thereby eliminating damage at this portion. In addition to these functions and effects, there is also a function and effect that the strength with respect to the compressive deformation and the like of the long circumference portion can be maintained equal to the strength of the short circumference portion.

Also, the weather strip according to the invention of claim 2 is:
Since the position of the seal portion with respect to the mounting portion is changed, and the length of the wall portion excluding the seal portion is changed, and the entire circumference is changed, the length of the seal portion is reduced to the entire length. The circumference of each of the two different weather strip portions is changed while maintaining the same constant over the entire length, so that a stable sealing function is exhibited over the entire length.

Furthermore, according to the method and the apparatus for forming a weather strip according to the invention as set forth in claims 3 to 9, a plurality of weather strip parts are integrated, and each weather strip part is a wall part forming its hollow. It is possible to continuously form a weather strip having a structure in which the thickness of the weather strip is kept constant. For this reason, in the conventional weatherstrip molding method, a step of separately forming a plurality of weatherstrip portions having different peripheral lengths and joining them using a mold was indispensable, but this step has been eliminated. The number of molding dies is reduced, and the number of types of molding dies to be held for molding is reduced by half, so equipment costs can be significantly reduced, and in addition, the number of setups and time required before molding are also reduced by half. .

[Brief description of the drawings]

Figure 1 is a partial perspective view of a vehicle equipped with door D equipped with weather strip S ₁ according to the present invention, FIG. 2 is a front view of the door D, FIG. 3 is a weather strip according to the present invention front view of the S _1, Fig. 4, the body frame 2 forming the door opening 3, shows the positional relationship between the weather strip S _1, Fig. 5, the weather strip S ₁ according to the present invention FIG. 6 is a plan cross-sectional view of a portion of the imaginary center core 8 formed in the state of the weatherstrip body S ₁ ′, and FIG. 7 is a first weatherstrip having a long circumference. part S ₁ a plan sectional view of a portion of the core 8 in a molding state of FIG. 8, like cross-sectional plan view of a portion of the core 8 in a molding condition of a short circumferential length second weather strip portion S ₁ b FIG. 9 is a perspective view of the molding die 5 in a non-molding state, and FIG.
FIG. 11 is a perspective view of the forming die 5 in a state where the second weather strip portion S ₁ b is being formed, and FIGS. 11 and 12 are first and second weather strip portions S ₁ a,
FIGS. 13 and 14 show the position of the cutter 13 with respect to the weatherstrip body S ₁ ′ in the molding state of S ₁ b, and FIGS. 13 and 14 show a fixed molding roller 9 and a movable molding roller, respectively.
Shows the 11 shape, FIG. 15 is a front view of another weather moldable strip S ₂ according to the present invention. The description of the reference numerals of the main parts constituting the present invention is as follows. S ₁ , S ₂ : Weather strip S ₁ ′: Weather strip body S ₁ a: First weather strip section S ₁ b: Second weather strip section 1: Door frame, 2: Body frame 3: Door opening , 5: Forming die 6, 6 ', 6 ": Opening of the weatherstrip body 7: Extrusion opening of forming die, 8: Core (width-adjustment assisting means) 8a, 8b: Circumferential length changing part of core 9: Fixed forming roller (width adjusting means) 11: Movable forming roller (width adjusting means), 13: Cutter (removing means) 15: Dough fusion part, 18: Dough cut piece (removed piece) 21: Weather strip Mounting part 22: Seal part of weather strip

Claims (9)

(57) [Claims] 1. A weather strip in which two weather strip portions having different peripheral lengths are continuous, wherein each of the weather strip portions having a different peripheral length keeps a wall thickness of a hollow wall constant. A weather strip characterized by being continuously formed integrally in the longitudinal direction while changing its perimeter as it is. 2. A weatherstrip, wherein a wall forming a hollow in a sectional view is integrally provided on a mounting portion, and two weatherstrips having different peripheral lengths are continuous. The position of the seal portion that partially forms the wall portion with respect to the mounting portion changes, and the length of the wall portion other than the portion that forms the seal portion changes, so that the entire circumference of the portion changes. A weatherstrip characterized by a variable length. 3. A method of forming a weatherstrip having a structure in which a plurality of weatherstrip portions having different circumferential lengths are continuously integrated, wherein a part is broken along a circumferential direction and a longitudinal direction is cut along a longitudinal direction. In a state where the weatherstrip body having the opening is continuously extruded, a portion facing the opening in the weatherstrip body is removed by the removing means, and the opening width is changed in each weatherstrip section. A method of forming a weatherstrip, wherein the width of the opening of the weatherstrip body is adjusted by a width adjusting means, and a portion separated through the opening is fused into a hollow shape. 4. The method according to claim 3, wherein the removing means is a cutter. 5. The method for forming a weather strip according to claim 3, wherein the width adjusting means is a roller attached to a front surface of a forming die for extruding the weather strip original. 6. The method for forming a weatherstrip according to claim 3, wherein width-adjustment assisting means that functions to assist in bringing the opening of the weatherstrip original into a width and fusing the same is used. 7. The method for forming a weather strip according to claim 6, wherein the width-shift assisting means is a core whose peripheral length gradually decreases along the extrusion direction. 8. The method for forming a weatherstrip according to claim 3, wherein the removed pieces of the weatherstrip body are always continuous. 9. A weather strip forming apparatus in which a plurality of weather strip portions having different circumferential lengths are continuously formed integrally, wherein a part is broken along a circumferential direction to form an opening along a longitudinal direction. A molding die provided with an extrusion opening at a front end face for continuously extruding a weatherstrip original having a portion, and a width of an opening portion of the weatherstrip original is adjusted to form the opening. And a removing unit for removing a portion facing the opening in the weatherstrip body and changing the width of the opening of each weatherstrip portion. And a weather strip forming apparatus, comprising: