JPH04347611A - Mold connection of extruded molding - Google Patents

Abstract

PURPOSE:To manufacture extruded moldings such as a door glass column for an automobile, composed of a plurality of mold-connected pieces of extruded bodies, by a process small in the number of man-hours and the number of molds at low cost and to improve the design properties of a connection part. CONSTITUTION:Both the end part of a first extruded body 11 with an embossed pattern stuck thereto and the end part of a second extruded body 12 free from a pattern are set in a mold 20 while keeping the prescribed interval. Material is filled in the cavity of the mold 20. A connected part 7 is formed between the first extruded body 11 and the second extruded body 12. The molding face of a top force 21 is provided with a first pattern 26 having the nearly same depth as the embossed pattern of the first extruded body 11, a second pattern 27 deeper than the first pattern 26 and a third pattern 28 whose depth is gradually changed. At the same time as mold forming of the connected part 7, the first pattern 26 is transferred on the surface of the connected part 7. The second pattern 27 is transferred on the surface of the design piece 8 of the second extruded body 12. The third pattern 28 is transferred to the boundary part of the connected part 7 and the design piece 8.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a method for connecting extrusion molded products made of a plurality of extruded bodies, such as a door glass run for an automobile, and in particular to a technique for forming a pattern on the connecting portion of the extruded bodies. It is.

0002

2. Description of the Related Art A door glass run for slidingly guiding an automobile window glass, for example, is known as an extrusion molded product formed by mold-connecting a plurality of extruded bodies. FIG. 5 is a front view of the front door of an automobile equipped with a conventional door glass run, viewed from the passenger compartment side. In the figure, 1 is the window frame of the front door, 2 is the window glass, 3 is the door mirror bracket attached to the front of the window frame 1, and 4 is attached to the sliding part between the window frame 1 and the window glass 2. This is the door glass run, and 5 indicates the door belt line.

The conventional door glass run 4 includes a first extruded body 31 extending obliquely downward from the roof of the vehicle body toward the door mirror bracket 3, and a first extruded body 31 extending diagonally downward from the front lower end of the first extruded body 31 beyond the door belt line 5. A second extrusion body 32 extending downward, a third extrusion body 33 extending further downward from the lower end of the second extrusion body 32, and a fourth extrusion body 33 extending beyond the door belt line 5 from the rear end of the first extrusion body 31. The fifth extruded body 35 extends further downward from the lower end of the fourth extruded body 34. Each extrusion body 31 to 35 is made of EPDM
It is formed by cutting an extruded product made of solid rubber material such as (ethylene propylene diene copolymer) into a predetermined length, and the ends are set in a mold (not shown) and inserted into the cavity. By filling the rubber material and providing a connecting portion 7, they are mutually connected by type. This type connection method is disclosed in JP-A-2-48227 and JP-A-2-48.
It is shown in the No. 228 publication.

[0004] Since the first extruded body 31, the second extruded body 32, and the fourth extruded body 34 are each exposed above the door belt line 5 toward the passenger compartment, their surfaces are usually coated with a material to improve their appearance. The grain pattern was formed by the following method. First, for each extruded body 31, 32, 34, a roller (not shown) provided with a grain pattern is used, and when the surface of each extruded body 31, 32, 34 is soft during extrusion molding, The grain pattern was transferred to the surface by applying pressure to the roller. In this case, reinforcing sheet metal inserts (not shown) are embedded in each of the first extrusion body 31, the second extrusion body 32, and the fourth extrusion body 34 in order to provide rigidity capable of resisting the pressing force of the rollers. be done. Note that the third extruded body 33 and the fifth extruded body located below the door belt line 5
Since the extruded body 35 is not exposed to the outside, there is no need to form a grain pattern, and naturally, no sheet metal insert is provided. Next, the connecting portion 7 is formed by applying a grain pattern to the molding surface of the mold, and transferring the grain pattern to the material injected during molding.

[0005]

[Problems to be Solved by the Invention] However, according to the conventional mold connection method, in order to form a grain pattern in a portion corresponding to the door mirror bracket 3, the first extruded body 31 and the third extruded body
It is necessary to provide the second extruded body 32 with an insert between the extruded body 33, and as a result, a total of five extruded bodies are required, increasing the number of components of the door glass run 4. Therefore, there was a problem that the number of man-hours and the number of molds for forming the connecting portion 7 increased, resulting in high costs. Moreover, sheet metal inserts usually have a number of slits formed in them so that the extruded body can be curved in the longitudinal direction during assembly, so if a roller is strongly pressed from above, a bellows-like insert mark will be left on the surface. It may appear. In this case, especially if it appears on the second extruded body 32 near the door mirror bracket 3, which is easily visible to the occupants, it spoils the appearance, so there is also a need to improve its design.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for connecting extrusion molded products that can be manufactured at low cost with a small number of man-hours and molds, and that can improve the design.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the method for connecting extrusion molded products according to the present invention is to provide an end portion of a first extruded body with a pattern and an end portion without a pattern. 2. Set the ends of the extruded body in the mold at a predetermined distance,
A material is filled into the cavity of the mold to form a connecting part between the ends of the first extruded body and the second extruded body, and when the connecting part is molded, the pattern provided on the molding surface of the mold is and is characterized in that it is transferred onto the surface of the second extruded body. Preferably,
A first pattern having approximately the same depth as the first extruded body is provided on the molding surface of a portion where the connection portion is to be molded, and a second pattern deeper than the first pattern is provided on the molding surface of the portion to be joined to the second extrusion body. 1st
A mold is used in which a third pattern whose depth gradually changes is provided on the molding surface at the boundary between the pattern and the second pattern.

[0008] Here, the above-mentioned "extrusion molded product" is composed of a plurality of extruded bodies, and for example, this product is applied to rubber or synthetic resin products installed in various parts of automobiles, such as glass runs, window moldings, and interior garnishes. The invention is applied. Examples of the above-mentioned "pattern" include grain patterns, wavy patterns, spotted patterns, etc., and grain patterns are usually frequently used in extrusion molded products mounted on the passenger compartment side of automobiles. As before, a pattern is formed on the surface of the "first extruded body" by a roller during extrusion molding, and a sheet metal insert is embedded inside the first extruded body so that it can withstand the pressing force of the roller. Ru. The surface of the "second extruded body" is not patterned and is not provided with a sheet metal insert. The "mold" consists of an upper mold, a lower mold, and a middle plate, and the molding surface of the upper mold has a "first pattern" and a "second pattern" each having a different depth.
"Pattern" and "Third Pattern" are continuously engraved. When the first extrusion body and the second extrusion body are connected by mold, the first pattern of the mold is placed on the surface of the connection part, the second pattern is placed on the surface of the second extrusion body, and the third pattern is placed on the surface of the connection part. It is transferred to the surface of the boundary region with the second extruded body.

[0009]

According to the mold connecting method of the present invention, the connecting portion is molded using a mold having a pattern on the molding surface, and at the same time, the pattern is formed on the surface of the connecting portion and the second extruded body. Therefore, there is no need to interpose another extruded body with a sheet metal insert embedded between the first extruded body and the second extruded body, which was necessary in the past, and the number of component parts, molding man-hours, and metal cost are reduced. It can be manufactured at low cost by reducing the number of molds. In addition, unlike the case of transfer using a roller, molding is performed by filling the cavity with plasticized material, so the pattern on the molding surface can be faithfully transferred to the connection part and the surface of the second extruded body, making it sharp. It is possible to form a pattern with a beautiful appearance. This improves the design of this part. In particular, the first pattern, second pattern, and third pattern on the molding surface.
If a mold with a pattern is used, the first extruded body, the connection part,
Since the pattern of the second extruded body is formed with a substantially uniform depth,
These boundaries can be resolved and the design quality can be further improved.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a mold connection method for a door glass run for an automobile will be described below with reference to FIGS. 1 to 4. Figure 1 is an exploded perspective view of a mold used to connect the molds of an automobile door glass run. Figure 2 is a perspective view of the main parts of the door glass run connected using the mold shown in Figure 1. Figure 1 schematically showing the pattern provided on the molding surface of the mold
4 is a rear view of the upper mold, and FIG. 4 is a front view of the entire door glass run as seen from the passenger compartment side.

As shown in FIG. 4, the door glass run 4 of this embodiment includes a first extruded body 11 extending from the roof to the upper end of the door mirror bracket 3, and a door belt extending from the front lower end of the first extruded body 11. A second extruded body 12 extends downward beyond the line 5, a third extruded body 13 hangs down beyond the door belt line 5 from the rear end of the first extruded body 11, and further extends downward from the lower end of the third extruded body 13. The fourth extruded body 14 extends to the fourth extruded body 14. The first extruded body 11 and the third extruded body 13 slide and guide the window glass 2 (see FIG. 5) above the door belt line 5, and the second extruded body 12 and the fourth extruded body 14 slide and guide the window glass 2 (see FIG. 5) above the door belt line 5. The window glass 2 is slidably guided below the window 5. In addition, each extruded body 11 to 14
is molded from a solid rubber material such as EPDM as in the past.

The first extruded body 11 and the third extruded body 13 are each formed by cutting an extruded article having the same cross-sectional shape into a required length, and as shown in FIGS. 5), and a guide portion 9 that slides and guides the window glass 2. A reinforcing sheet metal insert 6 is buried inside the trim portion 10, and a grain pattern 16 is formed on the surface exposed to the vehicle interior by a roller at the same time as extrusion molding. The second extruded body 12 and the fourth extruded body 14 are each formed by cutting an extruded product having the same cross-sectional shape into a required length, and each includes a guide portion 9 and a design piece 8, and a trim portion and a sheet metal insert are not provided. It has not been done. The design piece 8 below the door belt line 5 is unnecessary and is removed, leaving only the part corresponding to the door mirror bracket 3.
A grain pattern 18 is formed on the surface. A connecting portion 7 is formed between the first extruded body 11 and the second extruded body 12, and a grain pattern 17 is formed on the surface thereof. In addition, each grain pattern 16-18 is shown by hatching in FIG.

[0013] The mold 20 for molding the connection part 7 has a first
An upper mold 21 and a lower mold 22 in which the ends of the extruded body 11 and the second extruded body 12 are set at a required interval, and the first extruded body 1
1 and a middle plate (core) 23 inserted into the design piece 8 of the second extruded body 12. Upper mold 2
1 is provided with an injection port 24, and the middle plate 23 is provided with a gate 25. As shown in FIGS. 1 and 3, on the molding surface of the upper die 21, a first extruded body 1
A first pattern 26 having approximately the same depth (approximately 60 μm) as the first grain pattern 16 is engraved. A second pattern 27 deeper than the first pattern 26 (approximately 120 μm) is engraved on the molding surface of the second extruded body 12 at a portion to be joined to the design piece 8 . On the molding surface at the boundary between the first pattern 26 and the second pattern 27,
A third pattern 28 whose depth gradually changes (approximately 60 to 120 μm) is engraved. Further, the inner surface of the upper die 21 at the portion to be joined to the end of the first extruded body 11 has a pattern relief portion (no pattern) 29 . The middle plate 23 has the second extruded body 12
A built-up portion 30 is formed for press-bonding the design piece 8 to the second pattern 27 of the upper die 21. In addition, the first to third
Patterns 26-28 are indicated by hatching in FIG.

Next, a method of mold-connecting the first extruded body 11 and the second extruded body 12 of the door glass run 4 using the mold 20 constructed as described above will be explained. The first extruded body 11 and the second extruded body 12 are each cut into required lengths after extrusion molding. A grain pattern 16 is previously formed on the surface of the trim portion 10 of the first extruded body 11 by a roller. The second extruded body 12 is provided with a design piece 8 only in a portion corresponding to the door mirror bracket 3 by cutting out an unnecessary portion. The first extruded body 11 with the grain pattern 16
and the end of the second extruded body 12 without any pattern are set between the upper mold 21 and the lower mold 22 of the mold 20 at a predetermined distance. Further, the trim part 10 of the first extruded body 11 and the design piece 8 of the second extruded body 12 have an intermediate plate 23.
is inserted.

In this state, a plasticized material such as EPDM is filled into the cavity of the mold 20 from the injection port 24 of the upper mold 21 through the gate 25 of the middle plate 23. As a result, a connecting portion 7 is formed between the ends of the first extruded body 11 and the second extruded body 12, and the first pattern 26 provided on the molding surface of the upper die 21 forms a connecting portion 7 on the surface of the first extruded body 11 and the second extruded body 12. A grain pattern 17 having approximately the same depth as the grain pattern 16 of No. 11 is formed. The second pattern 27 of the upper mold 21 is transferred to the surface of the design piece 8 of the second extruded body 12, and a grain pattern 18 is formed thereon. The third pattern 28 is transferred. At this time, the rigidity of the design piece 8 is relatively small, but since the second pattern 27 is deeper than the first pattern 26 and the depth of the third pattern 28 is gradually changing, the texture of the design piece 8 is Pattern 18 is grain pattern 1 of connection part 7
It is formed at approximately the same depth as 7. After the material has solidified and is released from the mold, the first extruded body 11 and the second extruded body 1
Type 2 connection is completed. Note that the first extruded body 11 and the third extruded body 11
Extruded body 13, third extruded body 13 and fourth extruded body 1
4 is connected in the conventional manner.

As described above, according to the mold connection method of this embodiment, the grain patterns 17 and 18 are formed on the connection portion 7 and the design piece 8 of the second extruded body 12 at the same time as the connection portion 7 is molded. Ru. Therefore, between the first extrusion body 11 and the second extrusion body 12,
It is no longer necessary to use a separate extruded body in which a sheet metal insert is embedded, which was necessary in the past, and the number of extruded bodies, the number of man-hours for molding, and the number of molds can be reduced, and the door glass run 4 can be manufactured at a low cost. . In addition, the first to
Since the third patterns 26 to 28 are faithfully transferred to the surfaces of the connecting portion 7 and the design piece 8, it is possible to form the grain patterns 17 and 18 with a sharper appearance than when using a conventional roller. The design of the part protruding from the door mirror bracket 3 and exposed to the vehicle interior side can be improved. In particular, since the design piece 8 is pressed onto the second pattern 27 of the upper die 21 by the built-up part 30 of the middle plate 23, the grain pattern 18 can be clearly formed. Since it is not buried, there is no fear that insert marks will appear on the surface of the design piece 8. Moreover, the first part of the upper mold 21
~Since the depths of the third patterns 26 to 28 are different,
Grain pattern 16 of first extrusion body 11, grain pattern 1 of connection part 7
7. The grain pattern 18 of the design piece 8 can be formed with a substantially uniform depth, so that the boundary line between them can be eliminated.

Note that the present invention is not applied only to the door glass run 4 of the above embodiment, but also to rubber products attached to various parts of an automobile, such as window moldings and interior garnishes, or to rubber products other than automobiles. It may be applied to various extrusion molded products. In addition, the shape of the pattern and the cross-sectional shape of the extruded bodies 11 to 14 may be modified,
It is also possible to change the shape, material, and configuration of each part as appropriate without departing from the spirit of the present invention, such as by using a soft synthetic resin material such as PVC instead of a rubber material.

[0018]

As described in detail above, according to the mold connecting method according to claim 1, a pattern is formed on the surface of the connecting portion and the second extruded body at the same time as the molding of the connecting portion. There is no need to interpose a separate extruded body with a sheet metal insert embedded between the extruded body and the second extruded body, which was necessary in the past.
The number of component parts, the number of man-hours for molding, and the number of molds can be reduced to reduce the manufacturing cost, and a sharp-looking pattern can be formed to improve the design.

Further, according to the mold connection method according to claim 2, since the first pattern, the second pattern, and the third pattern are provided at different depths on the molding surface of the mold, the first extruded body, the connection The pattern on the second extruded body can be formed with a substantially uniform depth, and the boundary lines between them can be eliminated to further improve the design.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a mold for implementing a mold connection method for an automobile door glass run according to an embodiment of the present invention.

FIG. 2 is a perspective view showing essential parts of the door glass run connected by the mold shown in FIG. 1;

FIG. 3 is a back view of the upper mold of FIG. 1 schematically showing a pattern provided on the molding surface of the mold.

FIG. 4 is a front view showing the entire door glass run according to an embodiment of the present invention.

FIG. 5 is a front view showing a front door equipped with a conventional door glass run.

[Explanation of symbols]

4 Door glass run
7 Connection part 11 First extrusion body
12 Second extrusion bodies 16 to 18
Grain pattern 20 Mold 2
6 1st pattern
27 2nd pattern 28 3rd pattern

Claims (2)

[Claims] Claim 1: An end of a first extruded body with a pattern and an end of a second extruded body without a pattern are set in a mold with a predetermined interval, and the end of the first extruded body with a pattern is placed in a mold, and A material is filled into the cavity to form a connecting portion between the ends of the first extruded body and the second extruded body, and when the connecting portion is molded, a pattern provided on the molding surface of the mold is formed on the connecting portion and the second extruded body. A mold connection method for extrusion molded products characterized by transferring onto the surface of a body. 2. A first pattern having substantially the same depth as the pattern of the first extruded body is provided on the molding surface of the portion where the connection portion is to be molded,
A second pattern that is deeper than the first pattern is provided on the molding surface at a portion to be joined to the second extrusion, and a third pattern whose depth gradually changes on the molding surface at the boundary between the first pattern and the second pattern. 2. The method for connecting extrusion molded products according to claim 1, wherein a mold is used.