JP3836015B2 - Trim insert - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a trim insert embedded in a rubber or synthetic resin trim used as a sealing material or a decoration material for an automobile or the like.
[0002]
[Prior art]
The trim insert is used as a core material for maintaining the shape of a long trim used as a cushioning material, a decorative material, and a sealing material, such as a so-called weather strip attached to a door opening of a body of an automobile. It is done. As shown in FIG. 4, this kind of trim insert 40 made of sheet metal is embedded integrally in the trim main body 51 of a long molded product of rubber or synthetic resin. The trim (weather strip) 50 is bent in the width direction so as to be attached to a flange formed in, for example, a door opening (not shown). In the figure, B1 and B2 are bending portions of the bone fragment 41 of the insert 40, 52 is a fitting portion of the trim to the flange, 53 and 54 are lip portions thereof, and 55 is elastically abutting the door panel. It is a seal part for buffering and sealing between the door panel and the door opening.
[0003]
A sheet metal insert 40 embedded in the trim 50 includes, for example, as shown in FIG. 5, bone pieces 41, 41 that are arranged in parallel at a predetermined interval in the width direction and the bone pieces 41 connected in the length direction 1. Or it has two bond parts 42 and 43. The insert 40 is stamped and formed into a flat plate shape as shown in FIG. 6, and is usually supplied in a flat plate shape when the trim body 51 is extruded and embedded by integral molding, and then trimmed by a bending machine or the like. 4 is formed into a predetermined cross-sectional shape as shown in FIG.
[0004]
Further, the bond portion 43 is formed with a planned break portion T in order to bend the trim 50 three-dimensionally in the longitudinal direction thereof, and it is separated and broken by a separator or the like as necessary during the bending process. Or break when bent when attached to the car body. As described in Japanese Patent No. 3015025, the planned fracture portion T in this example makes the portion fragile by forming a through hole 45. The through hole 45 is provided by punching at a predetermined position of the bond portion 43, and the breaking strength of the planned fracture portion T can be easily adjusted by changing the shape and size (diameter) of the through hole 45. There are advantages you can do.
[0005]
However, since the bond portions 42 and 43 in the insert 40 for this kind of trim are a small space with a length of usually over 1 mm and a width of about 1 to 2 mm, the through hole 45 is highly processed at a predetermined position of the portion. It is not easy to form with accuracy, and there is a dislike that the processing work becomes very complicated. If the position of the through-hole 45 is shifted, the bond portion 43 of the planned fracture portion T may not break, or the bond portion 43 portion at a short distance from the through-hole 45 is likely to be broken, for example, extrusion integration At the time of molding, the extruded material may not withstand the shear resistance and may be partially cut. For this reason, there exists a problem that the yield of a product is bad.
[0006]
[Problems to be solved by the invention]
In view of such problems, the present invention can easily and easily process the planned fracture portion of the bond portion, enable reliable fracture, and the planned portion is inadvertently cut due to the shearing resistance of the extruded material during molding. The present invention proposes a new trim insert structure that does not cause a risk of misuse.
[0007]
[Means for Solving the Problems]
That is, the invention of claim 1 is made of sheet metal having a bone portion embedded in a rubber or a synthetic resin material and arranged in parallel in the width direction at a predetermined interval and a bond portion that connects the bone piece portions in the length direction. in trim insert, thereby forming the bond portion (12) breakable portion (T) in bending in by Ri linear work hardening portion obtained by plastic deformation (20), the work hardening portion is formed Further, the present invention relates to a trim insert characterized in that the width (Ws) of the bond portion is narrower than the width (W) of other general bond portions .
[0008]
According to a second aspect of the present invention, there is provided the trim insert according to the first aspect , wherein the work hardened portions are formed every predetermined number of the bond portions.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
1 is a plan view showing a part of a trim insert according to one embodiment of the present invention, FIG. 2 is an enlarged front view of a part of the trim insert of FIG. 1, and FIG. 3 is a trim insert of FIG. FIG.
[0010]
The trim insert 10 shown in FIGS. 1 to 3 is made of sheet metal, and a plurality of bone fragments 11, 11, 11 arranged in parallel at a predetermined interval in the width direction have two bond portions 12, 12, 13, 13. The linear work-hardening part 20 by the bending process is formed in the fracture | rupture planned part T where the bond part 12 of one side is fractured | ruptured. Note that the bond portion may be only on one side (for example, the reference numeral 12 side).
[0011]
The trim insert 10 shown in the embodiment of FIG. 1 is continuous in its length direction (left and right in the figure), is made of a sheet metal having a thickness of 0.4 mm, and the length of the bone fragment 11 (that is, the trim insert 10). Width) is 31.5 mm, the width of the bone fragment portion 11 is 2 mm, and the distance between the bone fragment portions 11, that is, the length of the bond portions 12 and 13 is 1.2 mm.
[0012]
The sheet metal constituting the trim insert 10 is made of various alloy plates such as an iron plate, an aluminum plate, a copper plate, and stainless steel, and the bone piece portion 11 and the bond portions 12 and 13 are formed by press-cutting the flat plate. The work hardening portion 20 of the bond portion 12A can be formed simultaneously or sequentially in the same press machine.
[0013]
The work hardening portion 20 of the planned fracture portion T of the bond portion 12A is formed in a linear shape by bending. In this example, as shown in FIG. 2, the bond portion 12 </ b> A having a length of 1.2 mm is bent at a radius of 1 mm, and the bent portion 21 forms a work hardening portion 20. A broken line T in FIG.
[0014]
Here, the work hardening portion 20 will be described. Work hardening is also called strain hardening, and is a phenomenon in which a metal is hardened by plastic deformation. It has been found that the plastically deformed metal has a higher yield strength or yield stress than the original metal and is less prone to plastic deformation, but has a smaller elongation to break. In other words, the work-hardened metal has the property of becoming strong but fragile. In the present invention, this is used for the shape retention of the insert and the ease of breakage.
[0015]
In the insert 10 shown in the figure, the width Ws of the bond portion 12A on which the work hardening portion 20 is formed is narrower than the width W of the other general bond portion 12 (13) as defined in the invention of claim 1. It is. In this embodiment, the width W of the general bond portion 12 in the bond portion 12 is 2 mm, and the width Ws of the bond portion 12A in which the work hardening portion 20 that is the planned fracture portion T is formed is 1 mm. As a result, the bond portion 12 </ b> A in which the work-hardening portion 20 that is the planned fracture portion T is formed is more easily broken. That is, the breaking strength of the planned fracture portion T can be adjusted by changing the width Ws of the bond portion 12 where the work hardening portion 20 is formed.
[0016]
Further, in the insert 10 of this embodiment, as defined in the invention of claim 2 , work hardening portions 20 which are the expected fracture portions T of the bond portions 12 </ b > A are formed every other bond portion 12. In this way, by forming the work-hardened portions 20 that are the planned fracture portions T at every predetermined number of the bond portions 12, the fracture locations can be appropriately selected, and the rigidity as an insert and the function of bendability can be achieved. It can be adjusted and changed.
[0017]
The insert 10 of the present invention is embedded by integral molding with the trim 50 in the same manner as the trim 50 of FIG. 4 described in the section of the prior art. The trim body 51 is made of an extruded product of rubber or synthetic resin such as EPDM (ethylene / propylene / diene terpolymer). As described above, the trim body 51 is flat when the trim body 51 is extruded. The insert 10 is supplied and molded integrally, and after the integral molding, it is bent into a predetermined shape as shown in FIG. 4 by a bending machine or the like.
[0018]
【The invention's effect】
As illustrated and described above, according to the trim insert of the present invention, a linear work-hardened portion is formed by bending in the planned fracture portion of the bond portion, so that processing of the planned fracture portion of the bond portion is performed. Can be easily and easily performed, and reliable breakage is possible. Moreover, the work-hardened part has a higher yield strength or yield stress than the original metal due to plastic deformation, making it difficult for plastic deformation to occur. There is no risk of being lost.
[0019]
Moreover , since the width of the bond part in which the said work hardening part was formed was formed narrower than the width | variety of another general bond part, it can fracture | rupture still more easily. Note that the ease of breakage can be easily adjusted and changed by changing the width of the bond portion where the work-hardened portion is formed.
[0020]
Furthermore, according to the invention of claim 2 , since the work hardening portions are formed at every predetermined number of bond portions, the break position can be selected as appropriate, and rigidity as an insert and ease of bending can be selected. Functions can be adjusted and changed.
[Brief description of the drawings]
FIG. 1 is a plan view showing a part of a trim insert according to an embodiment of the present invention.
2 is an enlarged front view of a part of the trim insert of FIG. 1; FIG.
FIG. 3 is a partial perspective view of the trim insert of FIG. 1;
FIG. 4 is a cross-sectional view showing an example of a trim in which trim inserts are embedded integrally.
FIG. 5 is a plan view showing an example of a conventional trim insert.
6 is an enlarged front view of a part of the trim insert of FIG. 5. FIG.
[Explanation of symbols]
10 Trim Insert 11 Bone Fragment 12, 13 Bond Part 20 Work Hardening Part T Expected Break

Claims (2)

In the insert for trim made of sheet metal having a bone piece portion embedded in rubber or a synthetic resin material and having a plurality of bone pieces arranged in parallel at a predetermined interval in the width direction and a bond portion connecting the bone piece portions in the length direction,
The bond portion (12) breakable portion (T) in the bent linear work hardening portions by Ri is plastically deformed in the processing of so as to form a (20), the work hardening portion formed bondline width ( An insert for trim characterized in that Ws) is formed narrower than the width (W) of other general bond portions . 2. The trim insert according to claim 1 , wherein the work hardened portion is formed every predetermined number of the bond portions.

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