JP3020437B2 - Molding terminal processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a molding,
In particular, the present invention relates to a method for processing a terminal of a molding for protection and decoration of an automobile.

[0002]

2. Description of the Related Art For example, as shown in FIG.
Rod-shaped or plate-shaped moldings M1 and M2 made of synthetic resin are attached to the door panel on the side of the vehicle body to protect the vehicle body surface from contact with other objects due to opening and closing of the door and to also decorate the vehicle body side surface. You. For this molding, a material obtained by cutting a molding material having a constant cross-sectional shape made of a long extruded product such as a soft vinyl chloride resin into a predetermined length is used. In the figure, reference numeral M1 denotes a front molding affixed to the front door Df, and M2 denotes a rear molding affixed to the rear door Dr.

The terminal of the molding has a predetermined curved shape from the viewpoint of design. For example, as can be clearly seen from FIG. 7 which is a cross-sectional view of a portion indicated by reference numeral 7 in FIG. 6 and FIG. 8 which is a perspective view of a terminal portion of the rear molding M2, a front terminal portion M2f of the rear molding M2. Is the front door D when the rear door Dr is opened.
In order to avoid interference with f, the terminal portion M2f is formed in a so-called spine-like shape that reaches the main body side general portion 93 via the end side thin portion 91 and the gradually changing portion 92.

[0004] As one means for forming such a terminal portion of a molding material having a constant cross section into a predetermined terminal shape, hot press molding of a molding material terminal portion as shown in FIGS. 9 and 10 has been proposed. . That is, for example, (9) in FIG.
In the molding material 60 having a constant cross-sectional shape continuously formed by extrusion molding or the like as in A), first, the back surface 62 of the terminal portion 61 is partially cut away as shown in FIG. Is done. This cutting is performed to enhance the deformability of the surface of the molding material 60. Numeral 63 denotes a cut portion, 6
Reference numeral 4 denotes a cut-out molding material portion.

[0005] The molding material 6 in which the cutout 63 is formed
As shown in FIG. 10 (10A), the terminal unit 6 is heated by a heating means 70 such as a heater from the back surface 62 of the terminal unit 61.
1 is heated and softened, and is introduced into a terminal forming die portion 72 of a fixed die 71 constituting one of the press forming dies. And
The terminal portion 61 of the mall material 60 that has been softened by heating is as shown in FIG.
As shown in (10B) to (10D), after being introduced into the terminal forming die 72, the movable die 73 constituting the other of the press forming dies is closed and press-formed into the terminal 66 having a predetermined shape. Is done. The protruding portion (burr) 67 generated in the terminal portion 66 of the press-formed molding material 60 is trimmed and cut after releasing from the mold as shown in (10E) and (10F) in the same figure. FIG. 9C is a perspective view of the terminal portion of the molding that has been subjected to the terminal processing as described above. Reference numeral 65 denotes a portion formed into a predetermined shape by the press.

However, in the press forming of the terminal portion as described above, the back portion 62 of the terminal portion 61 of the molding material 60 is used.
Is partially cut away to enhance the deformability of the molding material. However, depending on the shape of the terminal forming mold portion 72 of the fixed mold 71, the terminal portion 61 of the molding material 60 is completely formed by the terminal molding. In some cases, it is difficult to follow the mold surface of the mold portion 72. Also, the molding material 60 has its back surface 62 heated, and the surface of the molding material 60 on the terminal forming mold portion 72 side of the fixed mold 71 has a lower temperature than the back surface, as shown in FIG. As described above, in rare cases, the molding material 60 may have a cutout portion 69 that does not completely follow the mold surface of the terminal molding mold portion 72,
There was also a problem that the mold surface of the terminal molding mold part 72 was not completely copied to the molding material 60 even if it could not be said to be a missing part.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such a problem. The back surface of a terminal portion of a molding material is partially cut off and heated and softened to form a predetermined shape. An object of the present invention is to provide a processing method capable of completely performing copying of a mold surface without generating a blank portion during press molding and obtaining a terminal having good appearance.

[0008]

That is, the present invention provides:
When the terminal portion is heat-softened by partially cutting off the terminal portion back surface portion of the molding material having a constant cross-sectional shape, and when the terminal portion is press-formed into a predetermined shape by a press mold, at the time of molding the terminal portion, A push-in protruding member is detachably attached to the mold surface of the press mold opposite to the terminal portion back surface portion,
The present invention relates to a terminal processing method for a molding, wherein the projecting member is pressed against the molding material back surface to form the projecting member, and the projection member is embedded in the molding material back surface.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of an essential part showing steps in a terminal processing method according to an embodiment of the present invention in order, FIG. 2 is an enlarged sectional view showing a press-formed state of the terminal part, and FIG. FIG. 4 is a perspective view of an example of the push-in protruding member, and FIG. 5 is a cross-sectional view showing a press-formed state of another embodiment.

First, as shown in FIG. 1A, a back surface 22 of a terminal portion 21 of a molding material 20 having a constant cross-sectional shape continuously formed by extrusion or the like is partially cut off. A part 23 is formed. This resection 23
Is a groove shape along the surface shape of the molding material as indicated by reference numeral 63 in FIG. 9 (9B), for example.
The shape and size to be cut are determined according to the shape of the surface of the terminal to be processed.

[0011] The molding material 2 in which the cutout portion 23 is formed
0 is the back surface 2 of the terminal unit 21 as shown in FIG.
The terminal portion 21 is heated and softened by the heating means 30 such as a heater from the two portions, and introduced into the terminal forming die portion 33 of the fixed die 31 of the press forming die as shown in FIG. In addition, the mold surface of the terminal forming die portion 33 has a shape corresponding to the terminal surface shape of the molding.

The terminal portion 21 of the molding material 20 which has been heated and softened and introduced into the terminal forming die portion 33 of the fixed die 31.
As shown in (1B) to (1D) in the same figure, the movable mold 32 of the press mold is closed and press-molded.

The cutting surface of the movable mold 32 is
A pushing projection 35 is detachably attached to a position corresponding to 3. As is apparent from the enlarged cross-sectional view of the press-formed state of FIG. 2, the projecting member 35 is used to press-mold the terminal 21 of the molding material 20 by closing the movable mold 32. And causes the surface portion 24 of the terminal portion 21 to follow the terminal forming die portion 33 of the fixed die 31. Therefore, it is effective to provide the protruding member 35 on the mold surface of the movable die 32 corresponding to a portion where the surface portion 24 of the terminal portion 21 of the molding material 20 does not easily follow the terminal forming die portion 33 of the fixed die 31. is there.

Further, the pressing projection 35 is formed by pressing the terminal 21 of the molding material 20 at the time of press forming.
This is also to prevent the hollow concave portion from being formed as a part of the terminal portion 21 by being cut into the rear surface portion 22 and integrally formed. for that reason,
As shown in (1B) of FIG. 1, it is preferable that the projecting member 35 be provided so as to be aligned with the base 23 a of the cutout portion 23 of the terminal portion 21 of the molding material 20. Further, the projecting member 35 is preferably made of a material that is compatible with the molding material 20 so as to be easily bonded and integrated with the back surface of the molding material 20 that has been heated and softened during the press molding of the terminal portion 21 of the molding material 20. For example, when the molding material 20 is a vinyl chloride resin, the pushing protruding member 35 is also a vinyl chloride resin,
When the molding material 20 is made of polypropylene, the projecting member 35 is made of polypropylene. Note that an adhesive may be applied to the surface of the push-in protruding member 35 with or without a primer in order to enhance the adhesiveness with the molding material 20.

Since the pushing protrusion 35 is embedded in the back surface 22 of the terminal portion 21 of the molding material 20 as described above, a perspective view of an example of the protrusion 35 is shown in FIG.
The width w of the terminal part 21 of the molding material 20 is
Is smaller than the width of the movable mold 32.
When the mold is closed, the lower end of the protruding member 35 does not come into contact with the mold surface of the terminal forming mold portion 33 of the fixed mold 31. Further, the cross-sectional shape of the push-in protruding member 35 is an inverted triangle as shown by a chain line in the example of FIG. 4, but is not limited thereto and may be an appropriate shape. Preferably, as shown in the enlarged cross-sectional view of FIG. 2, the surface 35C of the pushing protrusion 35 facing the die surface 34C of the terminal forming die portion 33 of the fixed die 31 has the die surface 34C of the terminal forming die portion 33. It is preferable that the inclined surface or the curved surface be similar to the following. Thereby, the terminal portion 21 of the molding material 20 is connected to the terminal forming die portion 33 of the fixed die 31.
To the mold surface 34 more completely.

The pushing projection 35 is attached to the movable mold 32 by an appropriate detachable attaching means. For example, this is performed by providing a double-sided adhesive tape on the upper surface 35A of the pushing protruding member 35 shown in FIG. This is performed by a detachable engagement with a stop projection (not shown) or the like.

At the time of press-forming the terminal portion 21 of the heat-softened molding material 20, the pushing projection member 35 is pressed against the back surface 22 of the molding material 20 terminal portion 21, as shown in FIG. The resin P of the part 21 is pushed toward the mold surface 34 of the terminal molding part 33 of the fixed mold 31, and the terminal part 21 follows the mold surface 34 of the terminal molding part 33.
Thereby, as shown in (1D) of FIG.
The molding material portion is moved and deformed into the one cut-out portion 23, and is press-formed into a terminal portion 26 having a predetermined shape. Therefore, the molding material 20 is completely deformed along the mold surface of the terminal molding die portion 33, and the molding surface is completely copied to the molding material 20, so that the molding material 20 does not follow the molding surface of the terminal molding die portion 33. There is no occurrence of underfill due to cracks. At this time, the protruding member 35 is pushed into the back surface 22 of the terminal portion 21 of the molding material 20 and is embedded and integrated in the back surface portion 22 of the terminal portion 21.

The protruding portion (burr) 27 which is the surplus portion of the molding material generated at the end portion 26 of the molding material 20 is shown in FIGS. 1 (1E) and (1F).
As shown in FIG.

The finished product 40
As shown in FIG. 3, the terminal portion 26 is composed of a thin portion 41 on the distal end side, a gradually changing portion 42, and a main body side general portion 43, and the pushing protrusion is provided on the back surface of the gradually changing portion 42. Member 3
5 are buried. Therefore, when the product 40 is attached to the vehicle body and is heated by the sun, the product 40 does not have a hollow concave portion formed on the rear surface portion which is the side to be attached to the vehicle body due to the pressing of the pushing projection member 35 at the time of the press molding. For example, even if a residual stress confined during the press molding is developed, in a portion to be a concave portion of the cavity, the pushing projection member 35 filling the concave portion opposes the stress and deforms (warp) in the portion. ) Does not occur. as a result,
The appearance of the terminal portion 26 is favorably maintained.

On the other hand, when the above-mentioned press molding is performed by fixing the pushing protruding member 35 to the mold surface of the movable mold 32 so as not to come off, as shown in FIG. A hollow concave portion 29 is formed on the back surface of the terminal portion 26a by the pushing protrusion member 35. For this reason, when residual stress at the time of press molding is generated by heating the product, the concave portion 29 of the cavity cannot face the stress, and the product is easily deformed (warped) as shown by an arrow b and the appearance is easily damaged.

Another embodiment shown in FIG. 5 is a molding material 50 in which the thin portion 41 shown in FIG.
5 shows a method of processing the terminal unit 51 of FIG. Also in this case, the terminal portion 51 of the molding material 50 is processed in the same manner as described with reference to FIGS. Reference numeral 53 denotes a fixed die, 54 denotes a terminal forming die portion, 55 denotes a movable die, and 56 denotes a pushing protruding member.

In the above-described embodiment, the terminal portion of the molding material is heated and the terminal portion is introduced into the press molding die after being heated. May be used to heat the back surface of the terminal unit. In this case, a heating means such as a heater or a high-frequency heating means is embedded in the press molding die on the side opposite to the back surface of the terminal portion of the molding material. Further, in the above-described embodiment, the pushing projection member is detachably attached to the movable mold of the press molding die. However, when the rear surface of the terminal portion of the molding material is directed to the stationary mold surface, the stationary mold surface is used. The push-in protruding member may be detachably attached to the protruding member. Further, the press mold is not limited to one having a fixed mold and the other being a movable mold, and may be a type having both movable. In this case, it goes without saying that the push-in protruding member is detachably attached to the movable mold surface on the side facing the back surface of the terminal portion of the molding material.

[0023]

As described above, according to the processing method of the present invention, when the back surface of the end portion of the molding material is partially cut off, heated and softened, and pressed into a predetermined shape, the pushing projection member is used. A terminal with good appearance that can be pressed completely against the back of the molding material and molded, and the push-in protruding member is embedded in the back of the molding material, so that the mold surface can be completely copied without any underfill. Is easily obtained.
Furthermore, on the back side of the terminal portion of the obtained product, the pushing member is embedded, and since a concave portion of the cavity is not formed by pressing of the pushing member at the time of press molding, even when heated by solar heat or the like at the time of use, Deformation (warpage) due to the concave portion of the cavity does not occur in the terminal portion, and a good terminal appearance can be maintained.

Further, according to the processing method of the present invention, since the back surface of the terminal portion of the molding material is heated, color unevenness or the like due to heating is unlikely to occur on the front side which is the design surface of the product, and the decorativeness of the molding is improved. There is no risk of being damaged. In particular, even when a resin material colored in a metallic color is used as the molding material, the influence of heating on the surface portion on the design surface side is small, and metallic unevenness due to the movement of the metallic material is unlikely to appear on the surface portion side, There is also an effect that a terminal portion having a good appearance can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part in which steps in a terminal processing method according to an embodiment of the present invention are sequentially shown.

FIG. 2 is an enlarged cross-sectional view showing a press-formed state of the terminal portion.

FIG. 3 is a cross-sectional view of a press-formed terminal processing portion.

FIG. 4 is a perspective view of an example of a pushing protrusion member.

FIG. 5 is a sectional view showing a press-formed state of another embodiment.

FIG. 6 is a side view of an automobile equipped with a molding.

FIG. 7 is an enlarged sectional view of a portion 7 in FIG. 6;

FIG. 8 is a perspective view showing a terminal portion of the molding.

FIG. 9 is a diagram showing a conventional molding terminal processing method.

FIG. 10 is a sectional view showing a conventional molding terminal processing method in the order of steps.

FIG. 11 is a cross-sectional view showing a press forming state in a conventional processing method.

FIG. 12 is a sectional view of a product terminal portion processed by a method different from the processing method of the present invention.

[Explanation of symbols]

 Reference Signs List 20 molding material 21 terminal part 22 back part 23 cutout part 31 fixed die of press molding die 32 movable die of press molding die 33 terminal molding die part 35 protrusion member for pushing

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshikazu Haga 8-1, Tocho, Fujii-cho, Anjo-shi, Aichi Pref. INOAC CORPORATION Sakurai Office (56) References JP-A-61-235114 (JP, A) JP-A-3-164233 (JP, A) JP-A-1-115611 (JP, A) JP-A-8-300474 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 43 / 18 B29C 43/32-43/42 B29D 31/00 B60R 13/04

Claims (1)

(57) [Claims] 1. A terminal section of a molding material having a constant cross-sectional shape is partially cut away to heat and soften the terminal section,
When the terminal portion is press-molded into a predetermined shape by a press molding die, at the time of molding the terminal portion, a press-in protruding member is detachably attached to a mold surface of the press molding die opposed to the terminal portion back surface portion, A terminal processing method for molding, wherein a projecting member is pressed against the molding material back surface and molded, and the projection member is embedded in the molding material back surface.