JP4136176B2 - Joining method for vehicle molding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of joining a vehicle molding such as a window molding fitted in a window frame of an automobile.
[0002]
[Prior art]
A window-shaped vehicle mall, which is a window mall, is mounted on the window frame of an automobile. Windu Mall is responsible for decorating and protecting the window frame, as well as ensuring the sealing between the window and the window frame. When a vehicle molding is mounted on a window frame, a belt-shaped molding material produced by extrusion molding is usually used, so that at least one part is joined and assembled. In recent years, automobile bodies have become rounded, and accordingly, Windu Mall has been required to have a curved design part shape with a smooth outer periphery.
[0003]
[Problems to be solved by the invention]
However, conventionally, since the welding mold 6 as shown in FIG. 9 is used and processed in a round shape by post-processing, the portion has a rough appearance such as whitening. In the welding mold 6 of FIG. 9, the through holes 61 of the linear molding materials 2 and 3 are formed. In the conventional manufacturing method, the molding materials 2 and 3 to be joined are inserted into the through holes 61, their tips are regulated by the stopper 4 so as to be somewhat out of the mold, and then the stopper 4 is retracted. Next, a hot plate (not shown) advances in turn, softens and melts the molding material whose end is obliquely cut, removes the hot plate, and then joins and integrates them to join the vehicle molding. I went there. Since the outer peripheral portion of the joined portion of the molds 6a and 6b is the same as the cut shape of the molding materials 2 and 3, the joining portion of the molding materials 2 and 3 also has a cusp T (FIG. 10). After joining, the cusp T was shaved and rounded. As a result, defects such as whitening and the curved design part were uneven and looked bad.
In order to improve such a problem, for example, there is a technique as disclosed in Japanese Patent Laid-Open No. 10-156948 (FIG. 11). In this technique, a curved portion 72 is formed outside the joining portion of the welding mold 7, and the molding material 3 is heated and softened in an elastically deformed state to be welded. However, since the molding material 3 is elastically deformed into the mold 7 and inserted into the holding hole 71, the molding material 3 is distorted. When heated and welded in this distorted state, the compression strained portions 27 and 37 at the time of mold closing (a in FIG. 12) are restored at the time of demolding. After changing to 38, it looked bad (B in Fig. 12).
[0004]
An object of the present invention is to solve the above-described problems, and to provide a method for joining a vehicular molding that has a good appearance and has a smooth outer periphery without post-processing.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the gist of the present invention according to claim 1 is a vehicular molding joining method in which end portions of a belt-shaped molding material are welded and integrated, and the linear insertion hole of the molding material is provided. (A) using a pair of welding molds in which the mold is closed, both insertion holes are joined at a predetermined angle, and a curved design portion is provided on the outer side of the joining portion related to the insertion hole. A first step of obliquely cutting the end portions of both molding materials at a predetermined angle so as to be integrated with each other, and chamfering the outer ends of both molding materials to form a defect portion; and (b) in the insertion hole of the welding mold the base end portion of the defect is positioned at the bending point where the curved design part begins, and, with respect to Rutotomoni the defect was out collision the melting cost serving tip portion of the molding material into the insertion hole outside said curved design part set to make a clearance both mall material in the mold open state to the welding type And (c) the third step of heating, softening and melting the end of the molding material, and (d) welding and integrating the ends of the molding material by closing the mold of the welding mold, Pour a part of the molten resin, which is softened and melted at the tip of the molding material , into the void created by the insertion hole and the defect part, and cover the molding material cut surface of the defect part and place it on the cut surface. And a fourth step of integrating the vehicle moldings. Here, “position at the bending point” includes the case of positioning near the bending point. This is because similar actions and effects can be obtained.
A method for joining a vehicular molding according to a second aspect of the present invention, wherein, in the first aspect, the chipped portion formed by chamfering the outer side of the front end of the molding material is cut away leaving a thin skin including one side surface of the molding material. It is characterized by that.
[0006]
As in the first aspect of the invention, when the curved design portion is formed in the welding mold and the defect portion is formed in both molding materials, elastic deformation can be prevented from being caused by insertion of the molding material into the welding mold. Then, when the ends of the molding material are welded and integrated with each other by closing the welding mold, the portion where the molten resin in the melting allowance is scraped off by forming the defective portion is filled, and the curved design portion is provided in the welding mold. Therefore, it can be finished into a product with a rounded outer periphery in the molding stage.
Using a pair of welding molds in which a curved design portion is provided on the outer side of the joint portion related to the insertion hole, (a) the two molding materials are obliquely cut at a predetermined angle so that the ends of both molding materials to be joined can be integrated by welding. When chamfering the outer end of the tip and forming a defect portion, the base material of the defect portion is positioned at the bending point of the curved design portion in each insertion hole of the left and right molds just by striking the molding material against the stopper, In addition, both molding materials can be set by slightly projecting the tip portion of the molding material out of the insertion hole. When the molding material is pushed into the insertion hole, the molding material is set in a good condition by slightly projecting the tip portion, that is, the melting allowance out of the insertion hole before the molding material collides with the curved design portion due to the formation of the defect portion.
(B) The base end portion of the defect portion is positioned at the bending point where the curved design portion starts in the welding-type insertion hole, and the tip portion, which is a melting allowance of the molding material, is projected out of the insertion hole and the defect When the molding part is set to escape with respect to the curved design part and both moldings are set in a welded mold in a mold-open state, a chipping part is formed and the base end portion thereof is positioned at the bending point where the curved design part starts. Since it is set to the welding type, the outer side of the molding material does not hit the main forming portion of the curved design portion, and elastic molding does not occur in the molding material set. Since the molding material is not elastically deformed as in the prior art, it does not deteriorate in appearance due to restoration by elastic deformation when it becomes a product.
(D) By closing the mold of the welding mold, a part of the molten resin that is melted and softened and melted at the tip of the molding material is poured into the space created by the insertion hole and the defect part, and the molding material is cut at the defect part. When the cover is covered and integrated on the cut surface, the void is filled with molten resin in the melting allowance, so the curved surface is the same as the curved design part formed on the welding mold. You can make a product with At the stage where both molding materials are welded and integrated, the void portion of the defect portion is filled with the melting allowance portion, and the curved surface design portion is formed at the same time, so post-processing is not required. In this first step of creating a defect part, the molding material is cut, and the cut surface is once whitened. However, the molten resin later goes into the void and hides the whitened part. No problem.
When the thin skin as in the invention of claim 2 is provided, the appearance can be formed by the molding skin of the molding material itself, so that the appearance of the weld line can be avoided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a joining method of a vehicular molding concerning the present invention is described in detail.
(1) Embodiment 1
1 to 6 are one form of a joining method for a vehicle molding. FIGS. 1 and 2 are cross-sectional views around a welding-type connecting portion used for the molding, and FIG. 3 is a front view and a cross-sectional view of the molding material. 4 is a partial cross-sectional view showing a state in which the molding material is set in the welding mold, FIG. 5 is a partial cross-sectional view showing a state in which the molding material is welded and integrated by closing the mold, and FIG. The fragmentary sectional view of the joint location of the molding material obtained with a type | mold is shown. This applies to Windu Mall.
[0008]
First, prior to the description of the joining method of the vehicle molding, the welding mold 1 used for this will be described. The welding mold 1 includes a pair of molds (here, left and right molds), and linear insertion holes 11 into which the molding materials 2 and 3 can be inserted are formed in the left and right molds 1a and 1b, respectively (FIG. 1). ). The overall shape of the welding die 1 is the same as in FIG. 9, and the two insertion holes 11 are joined at a predetermined angle (about 90 °) by closing the die. However, when the mold is closed, a curved design portion 12 is provided on the outer side of the joining portion 14 related to the insertion hole 11 so as to form a round and curved curved design surface (FIG. 2). The left and right molds 1a and 1b only have to be able to insert the molding materials 2 and 3 into the insertion hole 11, and may be integrated or divided.
[0009]
The molding materials 2 and 3 are extrusion molded products having a cross-sectional shape in the longitudinal direction. Here, different types of molding materials are joined, and molding materials 2 and 3 as shown in FIGS. 3A and 3B, for example, having grooves 29 and 39 for fitting into the window are prepared. The The molding materials 2 and 3 are made of resin such as vinyl chloride resin or polypropylene. 3 (a) and 3 (b) are front views, a cross-sectional view with hatching is added through a broken line for convenience.
[0010]
In the method for joining the molding for a vehicle, first, the strip-shaped molding materials 2 and 3 are cut (first step). The two molding materials 2 and 3 to be joined are obliquely cut at predetermined angles θ ₁ and θ ₂ (about 45 ° in this case) at which the end portions 2a and 3a can be welded and integrated. In addition to the formation of the oblique cut surfaces 21 and 31, the defect portions 22 and 32 are further formed at locations corresponding to the curved surface design portion 12. Specifically, chamfers are formed on the outer ends of the two molding materials 2 and 3 to form the missing portions 22 and 32 (FIG. 3). The missing portions 22 and 32 create a relief for the curved surface design portion 12. The base end portions 23 and 33 of the missing portions 22 and 32 are positioned at the bending point 13 (including the vicinity of the bending point) of the curved design portion 12 when the molding materials 2 and 3 are inserted into the insertion hole 11. Shall be allowed to. The missing portions 22 and 32 are satisfied as long as they can make a relief with respect to the curved design portion 12, and may not be flat surfaces as shown in FIG.
[0011]
Next, it is set in a mold open state in which the stopper is sandwiched between the welding molds 1 at a predetermined distance f from the disk-shaped stopper 4. Then, as shown in FIG. 4, the molding materials 2 and 3 are pushed into the respective insertion holes 11 of the left and right molds 1a and 1b, and are stopped when the tip of the molding material hits the stopper 4 (second step). By simply abutting the molding materials 2 and 3 against the stopper 4, the base end portions 23 and 33 of the missing portions 22 and 32 are formed at the bending points 13 of the curved design portion 12 in the respective insertion holes 11 of the left and right molds 1 a and 1 b. The tip portions 25 and 35 of the molding materials 2 and 3 are slightly projected outside the insertion hole 11 so that the molding materials 2 and 3 can be set. When the molding material 2, 3 is pushed into the insertion hole 11, the molding material 2, 3 inserts the tip portions, that is, the melting margins 25, 35 before the molding material 2, 3 hits the curved surface design portion 12 due to the formation of the defect portions 22, 32. 11 is projected slightly outside and set in a good condition. In FIG. 4, only the right mold 1 b and the molding material 3 are illustrated, but the left mold 1 a and the molding material 2 have the same configuration with the stopper 4 as the axis of symmetry.
[0012]
Thereafter, the stopper 4 is retracted, and a hot plate (not shown) is introduced to the position where the stopper 4 is present. The end portions 2a and 3a of the molding materials 2 and 3 are heated by a hot plate to soften and melt the end portions (third step). A heating source may be added to the stopper 4 and a hot plate may be used together.
[0013]
Subsequently, the hot plate is retracted, and then the ends of the molding materials 2 and 3 are pressed together by the mold closing of the welding mold 1 as shown in FIG. The melted resin obtained by joining the end portions 2a and 3a of the welded and softened molding materials 2 and 3 and melting the melting margins 25 and 35 at the tip portions of the molding material seeks escape areas, and part of the molten resin is the insertion hole 11. Then, it flows into the void ε formed by the defect portions 22 and 32, covers the molding material cut surfaces 221 and 321 of the defect portions 22 and 32, and is overlaid and integrated on the cut surfaces. The molten resin that does not become the upper portions 26 and 36 on the cut surfaces 221 and 321 is removed by mold closing. The voids ε are filled with the original color of the resin of the molding materials 2 and 3 (in this case, black), and the product P having a smooth outer shape is formed without deformation at the joint portion of the molding materials 2 and 3.
[0014]
Thus, when the molding materials 2 and 3 are joined and the product is taken out by demolding, a vehicle molding P (also referred to as a vehicle molding) as a desired window molding as shown in FIG. 6 is completed.
[0015]
According to the vehicular molding joining method configured as described above, the curved design portion 12 is provided outside the joining portion 14 of the welding mold 1, and the end portions 2 a and 3 a of the molding materials 2 and 3 are welded and integrated. In the step of forming, the defect portions 22 and 32 are formed, and the base end portions 23 and 33 are positioned at the bending point 13 where the curved surface design portion 12 starts so that the molding materials 2 and 3 are set in the welding mold 1. Therefore, the outer side of the molding materials 2 and 3 does not hit the main forming portion of the curved surface design portion 12, and elastic deformation does not occur in the set of molding materials 2 and 3. Then, in the melting and joining process of the molding materials 2 and 3, the melting allowance portions 25 and 35 at the tip portion enter the void ε created by the notched portions 22 and 32 cut out in the pretreatment (first step), Since it is placed on the molding material cut surfaces 221 and 321 of the chipped portion and the void ε is filled with the molten resin of the melting allowance portions 25 and 35, the outer periphery of the same curved surface as the curved design portion 12 formed in the welding mold 1 It is possible to manufacture a product with the gently curved upper portions 26, 36. At the stage where both the molding materials 2 and 3 are welded and integrated, the melted portions 25 and 35 fill the voids ε of the defect portions 22 and 32 and simultaneously create the curved design portion, so that no post-processing is required. Finish in a uniform curved design part shape. When the curved design portion is formed by post-processing such as paper cutting or C-plane cutting, whitening traces remain, but since the post-processing is not performed, no whitening line is generated at the joining portion. In the first step of creating the defect portions 22 and 32, the molding materials 2 and 3 that are molded products are cut, so that the cutting surfaces 221 and 321 are once whitened, but the molten resins 25 and 35 are later formed into voids ε. There is no problem because it wraps around and hides the whitened portion. Since the molding materials 2 and 3 are not elastically deformed as in the prior art, the appearance does not deteriorate due to restoration by elastic deformation when the product is made.
[0016]
(2) Embodiment 2
In the present embodiment, when the defect portions 22 and 32 are formed in the first step of the first embodiment, the defect portions are notched leaving the thin skin 30 including one side surface 34 of the molding material 2 and 3. (FIG. 7).
Using the same welding mold 1 as in the first embodiment, the molding materials 2 and 3 are formed in which the defect portions 22 and 32 in which the thin skin 30 is left are formed in the first step. In the second step, the base end portions 23 and 33 of the missing portions 22 and 32 are positioned at the bending point 13 where the curved surface design portion 12 starts and the distal end portions 25 and 35 of the molding materials 2 and 3 are inserted into the insertion hole 11. The moldings 2 and 3 are set to the welding mold 1 in a mold open state by slightly projecting outside the insertion hole 11, and the thin skin 30 is further arranged along the wall surface of the curved design portion 12 of the insertion hole 11. Then, the molding materials 2 and 3 are inserted into the insertion hole 11. Thereafter, the third and fourth steps similar to those in the first embodiment are entered. However, in the fourth step, the melted resin 25 and 35 flows into the inner space ε of the thin skin 30 along the curved design portion wall surface of the insertion hole 11. The molten resin enters the inner space ε of the thin skin 30, so that even if the thin skin 30 is not well set on the wall surface of the curved design portion 12, the molten resin of the melting allowances 25 and 35 inserts the thin skin 30 from the inside. 11, the molten resin flows into the void ε while pressing against the wall surface of the curved design portion, and the thin skin 30 is set cleanly. Thus, the molding is finished, and a desired vehicle molding is obtained by demolding. Other process descriptions are the same as those in the first embodiment and will not be described in detail.
[0017]
According to the vehicular molding joining method configured as described above, the upper portions 26 and 36 that are built up on the molding material cut surfaces of the missing portions 22 and 32 and the molding material main body do not give a sense of incongruity, and the shape thereof from the beginning. The product has an appearance such as a product molded with, and is excellent in quality. In the first embodiment, a weld line WL sometimes appears at the boundary between the molding material cut surfaces 221 and 321 of the defect portions 22 and 32 and the overlaid portions 26 and 36 that are overlaid (FIGS. 6 and 8). . In the present embodiment, the exterior design surface is formed by the thin skin 30 having a uniform surface as the molding materials 2 and 3 originally, so that the weld line WL does not appear and a more attractive vehicle molding can be obtained. In the second step, the molding materials 2 and 3 are inserted into the insertion hole 11 so that the thin skin 30 is along the wall surface of the curved design portion 12 of the insertion hole 11. The elastic deformation which gives badness at the time of insertion of does not occur. There is no problem in quality. Other operations and effects are the same as those of the first embodiment, and the description thereof is omitted.
[0018]
In addition, in this invention, it is not restricted to what is shown to the said embodiment, According to the objective and a use, it can change variously in the range of this invention. The shape, size, material, and the like of the welding mold 1, the molding material 2, 3, the stopper 4, etc. can be appropriately selected according to the application.
[0019]
【The invention's effect】
As described above, the vehicular molding joining method of the present invention is excellent in appearance and can produce a stable quality with a smooth outer periphery without post-processing.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view around a connection portion in a mold-open state of a welding type used for a vehicular molding joining method according to a first embodiment.
FIG. 2 is a cross-sectional view around a connection portion in a mold closing state in the welding mold of FIG. 1;
FIG. 3 is a front view and a cross-sectional view of a molding material.
FIG. 4 is a partial cross-sectional view showing a state in which a molding material is set in a welding mold.
FIG. 5 is a partial cross-sectional view showing a state in which the molding material is welded and integrated by closing the mold, proceeding from the step of FIG. 4;
FIG. 6 is a partial cross-sectional view of a joining portion of a molding material obtained by demolding.
7 is a partially enlarged perspective view around an insertion hole and a defect portion in Embodiment 2. FIG.
FIG. 8 is a reference perspective view of another mode of building up a defect portion.
FIG. 9 is an explanatory sectional view of a conventional technique.
FIG. 10 is an explanatory perspective view of the prior art.
FIG. 11 is an explanatory sectional view of the prior art.
FIG. 12 is an explanatory diagram of a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Welding type 11 Insertion hole 12 Curved surface design part 13 Bending point 2,3 Mold material 2a, 3a End part 22, 32 Deletion part 221,321 Cut surface 23,33 Base end part 25,35 Melting allowance ( front end part)
30 Thin skin 34 One side
ε void

Claims (2)

A vehicular molding joining method in which end portions of a belt-shaped molding material are fused and integrated,
A pair of welds in which linear insertion holes for the molding material are formed, the mold is closed, both insertion holes are joined at a predetermined angle, and a curved design portion is provided on the outer side of the joining portion related to the insertion hole. Using a mold
(A) a first step of obliquely cutting the end portions of both molding materials to be joined at a predetermined angle so as to be integrated, and chamfering the outer ends of both molding materials to form a defect portion;
(B) a base end portion of the defect portion into the insertion hole of the welding-type is positioned at the bending point where the curved design part begins, and, Rutotomoni allowed out collision the melting cost serving tip portion of the molding material into the insertion hole out A second step in which the deficient portion makes a relief with respect to the curved design portion and sets both molding materials in a welded mold in an open state;
(C) a third step of heating, softening and melting the end of the molding material;
(D) By closing the mold of the welding mold, the ends of the molding material are welded and integrated, and at the tip of the molding material, a part of the molten resin that is melted and melted is inserted into the insertion hole and the defect portion. And a fourth step of pouring into the void created in step 1 and covering the molding material cut surface of the defective portion and overlaying and integrating it on the cut surface.   The joining method of the molding for vehicles of Claim 1 with which the defect | deletion part which chamfers and forms the front-end | tip part outer side of the said molding material was cut off leaving the thin skin containing one side of a molding material.

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