JP2006341499A - Manufacturing method of molding and molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding 10 manufacturing method capable of forming the end part 40 of the molding finely in appearance. <P>SOLUTION: The manufacturing method is constituted by the steps of forming the projection part 44 on the rear side of the design part 12 by removing the lower half part of the body 14 over a predetermined length from the tip of the molding end part 40; forming the thin-wall part 42a having a thickness capable of elastic deformation by removing, in the tip of the molding end part 40, the rear side of the design part 12 while leaving its front face intact; arranging the molding 10 in a molding die and bending the thin-wall part 42a to the rear side to form the end wall 42; and in the molding die injection-molding the bridging part 50 that links the projection part 44 and the end wall 42. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a molding manufacturing method and a molding.

  As shown in FIG. 8, a roof molding 10 is attached to a vehicle 1 such as an automobile. The roof molding 10 covers the groove 4 formed at the joint between the roof panel 2 and the body side panel 3. As shown in FIG. 2A, the roof molding 10 includes a design part 12 that covers the groove part 4, a body part 14 that extends from the back side of the design part 12 toward the bottom surface of the groove part 4, and the groove part 4 from the body part 14. And a foot portion 20 extending toward the side surface. The roof molding 10 is formed long by an extrusion method using a thermoplastic resin material.

  In order to improve the appearance, an end cap formed by an injection molding method in a separate process from the roof molding is often attached to the terminal portion of the roof molding. However, the color difference between the roof molding and the end cap is greatly different, and when the end cap is attached to the roof molding, a joining line appears between the two, and there is a limit to improving the appearance.

Therefore, Patent Document 1 discloses a step of forming a recess at the end of an extruded strip (molding) while removing the extruded material from the back side of the strip and leaving the outer appearance-presenting surface. The step of encapsulating the one end in a mold having an inner surface shape corresponding to the shape of the end of the decorative strip, and filling the strip recess with the material by injecting a thermoplastic material into the mold. There has been proposed a method of manufacturing a decorative strip having a step of joining to the strip and adapting the shape of the end portion of the strip to the shape of the inner surface of the mold.
JP-A-6-170880 JP 2004-174842 A

  However, in the method of Patent Document 1, since the appearance presenting surface is brought into close contact with the inner surface of the molding die by the injection pressure when the thermoplastic material is injected, color unevenness may occur on the appearance presenting surface. In addition, sink marks are likely to occur on the appearance-presenting surface, and there is a possibility that a step may be formed on the appearance-presenting surface at the boundary portion between the portion where the extrusion molding material is removed and the portion where it is not removed.

  In Patent Document 2, after setting the molding body to the fixed mold, the molding body is irradiated with infrared rays to heat and soften, and the movable mold is closed and the terminal portion of the molding material is pressed. Techniques for manufacturing a molding provided with a cover portion have been proposed. However, in the method of Patent Document 2, the molding apparatus becomes complicated, and the design surface may be discolored or deformed by heat softening of the molding body.

This invention is made | formed in view of the said situation, Comprising: It aims at providing the manufacturing method of the molding which can form a terminal part beautifully.
It is another object of the present invention to provide a molding provided with a good-looking terminal unit.

  In order to solve the above problems, a manufacturing method of a roof molding according to the present invention is a manufacturing method of a molding that is attached to a vehicle and includes a design part and a body part on the back side of the design part, and the molding terminal part Removing the lower half of the body part over a predetermined length from the tip of the body, and forming a convex part on the back side of the design part with the remaining upper half part of the body part; and At the tip, by removing the back side of the design part while leaving the surface of the design part, forming the thin part with a thickness that can be elastically deformed, and arranging the molding in a mold, the thin part And a step of forming a terminal wall, and a step of injection-molding a bridging portion for connecting the convex portion and the terminal wall in the mold.

  According to this structure, since a terminal wall is continuously formed from the design part, no joint line appears between them. Further, since the thin portion is bent by elastic deformation, the bent portion is not damaged or whitened. In addition, since the convex portion is formed on the back side of the design portion and the cross-linked portion that connects the convex portion and the terminal wall is formed by injection molding, the constituent material of the cross-linked portion does not directly contact the back side of the design portion. No uneven color or sink marks occur on the surface of the design part. Therefore, the terminal portion can be formed with good appearance.

Further, it is desirable that the thin portion be bent at room temperature.
According to this configuration, it is possible to prevent the surface of the terminal wall from being discolored or deformed. Therefore, the terminal portion can be formed with good appearance.

Moreover, it is desirable that the constituent material of the cross-linking portion is compatible with the constituent material of the molding.
According to this structure, a terminal wall and a convex part can be connected by injection-molding a bridge | crosslinking part.

Moreover, it is desirable to have the process of shaping the said terminal wall into a desired shape after the formation process of the said bridge | crosslinking part.
According to this configuration, the terminal portion can be formed with better appearance.

In addition, it is desirable that the corner portion of the mold that bends the thin-walled portion abuts on the thin-walled portion is rounded.
According to this structure, it becomes possible to prevent the damage of the surface of a terminal wall, and it can form a terminal part with good appearance.

Moreover, it is desirable that the surface of the mold that bends the thin-walled portion is in contact with the thin-walled portion, and is subjected to plating treatment.
According to this structure, it becomes possible to prevent the damage of the surface of a terminal wall, and it can form a terminal part with good appearance.

On the other hand, the molding according to the present invention is characterized by being manufactured using the above-described molding manufacturing method.
According to this structure, the molding provided with the terminal part with a good appearance can be provided.

  According to the method for manufacturing a molding according to the present invention, the terminal wall is continuously formed from the design portion, so that no joining line appears between them. Further, since the thin portion is bent by elastic deformation, the bent portion is not damaged or whitened. In addition, since the convex portion is formed on the back side of the design portion and the cross-linked portion that connects the convex portion and the terminal wall is formed by injection molding, the constituent material of the cross-linked portion does not directly contact the back side of the design portion. No uneven color or sink marks occur on the surface of the design part. Therefore, the terminal portion can be formed with good appearance.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, roof molding is described as an example, but the present invention can be applied to other moldings such as window molding and side molding.

(Roof molding)
FIG. 1 is a roof molding according to the present embodiment, FIG. 1 (a) is a front side perspective view, and FIG. 1 (b) is a back side perspective view. The roof molding 10 according to the present embodiment includes a molding material 11 and a terminal portion 40 thereof. The terminal portion 40 includes a terminal wall 42 formed by bending the design portion 12 at the front end in the longitudinal direction to the back side, a convex portion 44 formed on the back side of the design portion 12 inside the terminal wall 42, and the terminal A bridging portion 50 that connects the wall 42 and the convex portion 44 is formed.

  FIG. 2A is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 2A, the molding material 11 is attached to a groove portion 4 formed at a joint portion between the roof panel 2 and the body side panel 3 of the vehicle. Therefore, the molding material 11 includes a design portion 12 that covers the opening of the groove portion 4, a body portion 14 that extends downward from the back side of the design portion 12, and foot portions 20 and 30 that project from the lower end of the body portion 14 to both sides. Lips 22 and 32 that extend laterally from the tips of the foot portions 20 and 30 are provided. A core material 16 made of a metal material is embedded in the body portion 14.

  The design part 12, the body part 14, and the foot parts 20 and 30 are made of hard resin, and the lips 22 and 32 are made of soft resin. As these hard resin part and soft resin part, thermoplastic resins such as vinyl chloride and TPO (Thermo Plastic Olefin) are employed. A long molding material 11 is formed by heating and extruding the thermoplastic resin.

(Terminal part)
FIG. 2B is a cross-sectional view taken along line BB in FIGS. 1A and 2A. As shown in FIG.2 (b), in the terminal part 40 of the molding molding material 11, the back side of the design part 12 is removed, and the thin part 42a is formed. The thin wall portion 42 a is bent substantially perpendicularly to the back side of the design portion 12 to form a terminal wall 42.

  In addition, on the inner side of the terminal wall 42, the lower half of the trunk portion 14 is removed over a predetermined length in the longitudinal direction, and the convex portion 44 is formed by the remaining upper half portion of the trunk portion 14. The convex portion 44 extends from the back side of the terminal wall 42 in the longitudinal direction over a predetermined length. A notched portion 46 from which the entire body portion 14 is removed is formed between the convex portion 44 and the molding material 11.

  And the bridge | crosslinking part 50 which connects the terminal wall 42 and the convex part 44 is formed. The bridging portion 50 is formed by injection molding a resin material. As the resin material, a material having compatibility with the resin material constituting the molding material 11 is employed. For example, the same resin material as that of the molding material 11 is employed. The terminal wall 42 and the convex portion 44 are connected by injection molding the bridging portion 50 from the lower end surface of the convex portion 44 to the back surface of the terminal wall 42. As shown in FIG. 1B, the bridging portion 50 has a length equivalent to that of the convex portion 44 and is wider than the convex portion 44.

(Manufacturing method of roof molding)
Next, the manufacturing method of the roof molding which concerns on this embodiment is demonstrated.
FIG. 3 is a back side perspective view showing a state of the terminal portion after machining. First, the molding material 11 provided with the design part 12, the body part 14, the foot part 20 and the like as described above is extruded.

  Next, the end portion 40 of the molding material 11 is machined. First, the lower half part of the trunk | drum 14 is excised from the front-end | tip of the terminal part 40 over predetermined length, and the convex part 44 is formed. Further, the entire body portion 14 is cut out inside the convex portion 44 to form a cutout portion 46. These excision processes are desirably performed collectively by placing a molding material in a cutting die.

  Next, the thin part 42a is formed by removing the back side of the design part 12 while leaving the surface of the design part 12 at the tip of the terminal part 40. For this removal process, it is desirable to employ a milling process using an end mill. The thickness t of the thin portion 42a is formed to a thickness that can be bent by elastic deformation. In addition, in order to prevent the resin material injection-molded on the back side of the terminal wall from turning around to the front side in the forming step of the bridge portion to be described later, the thin-walled portion 42a is recessed with the unprocessed portion 42b around the thin-walled portion 42a. It is desirable to form. The unprocessed portion 42b can dam up the entrainment of the resin material.

Next, the thin-walled portion is bent and the cross-linked portion is injection-molded. These steps are performed in the mold for the cross-linked portion.
FIG. 4 is a perspective view of a lower mold and a slide mold constituting the mold for forming the bridging portion. On the upper surface of the lower mold 60, a cavity 64 for injection molding the bridge portion is formed. A pair of slide dies 70 are disposed on both sides of the cavity 64 in the width direction. Each slide mold 70 can be slid in the horizontal direction by a cylinder 71.

Set the roof molding on the lower mold and slide mold.
FIG. 5 shows a state in which the roof molding is set in the lower mold and the slide mold, FIG. 5 (a) is a cross-sectional view taken along the line DD in FIG. 4, and FIG. 5 (b) shows G in FIG. FIG. 5C is a cross-sectional view taken along the line EE of FIG. 4, and FIG. 5D is an enlarged view of the H portion of FIG. 5C.
As shown in FIGS. 5A and 5B, the roof molding 10 is set in a state where the lower end surface of the convex portion 44 is exposed to the cavity 64. Each slide mold 70 is provided with an overhanging portion 74 that covers the upper side of the cavity 64. By sandwiching the side surface of the convex portion 44 by the overhanging portion 74, the roof molding 10 can be fixed in the mold, and the resin material injected into the cavity 64 can be prevented from flowing out to the back side of the design portion. It can be done.

  Further, as shown in FIGS. 5C and 5D, the notch 46 of the roof molding 10 is engaged with the side wall 66 of the cavity 64. Thereby, the roof molding 10 is positioned in the longitudinal direction. Further, a protruding portion 76 that protrudes from the slide-type protruding portion is inserted into a gap between the design portion 12 of the roof molding 10 and the side wall 66 of the lower mold 60. The resin material injected into the cavity 64 can be prevented from flowing over the side wall 66 by abutting the front end face of each slide-type protrusion 76.

Next, the upper mold is set and the mold is closed.
FIG. 6 is a cross-sectional view of the upper die and the lower die at a portion corresponding to the line EE in FIG. FIG. 6A shows a state before closing the mold, and FIG. 6B shows a state after closing the mold. As shown in FIG. 6A, a fitting recess 62 is formed in the lower mold 60 so as to face the thin portion 42 a of the roof molding 10 set in the lower mold 60. Corresponding to the fitting recess 62 of the lower mold 60, a fitting protrusion 82 is formed on the upper mold 80. A round chamfer 83 is provided on the inner corner of the lower end of the fitting convex portion 82. In addition, the surface of the fitting convex portion 82 is plated to ensure surface accuracy.

  Then, as shown in FIG. 6B, the upper mold 80 is lowered and the mold is closed. At this time, the thin wall portion 42 a of the roof molding 10 is bent substantially perpendicularly to the back side of the design portion 12 by the fitting convex portion 82 of the upper mold 80, thereby forming the terminal wall 42. Since the thin portion 42a is formed to a thickness that can be bent by elastic deformation, it can be bent at room temperature. Therefore, the surface of the terminal wall 42 can be prevented from being discolored or deformed. The normal temperature here refers to a temperature at which the resin material is not discolored or deformed, and can be regarded as normal temperature even if the temperature in the mold rises due to injection of the resin material described later. Further, a round chamfer 83 is applied to the corner portion of the fitting convex portion 82 that comes into contact with the thin portion 42a, and the surface of the fitting convex portion 82 that comes into contact with the thin portion 42a is plated, so that the fitting is performed. The thin portion 42a can be prevented from being damaged due to contact with the convex portion 82.

Next, a resin material is injected to form a crosslinked part.
FIG. 7 shows a state in which a resin material is injected, FIG. 7A is a cross-sectional view of a portion corresponding to the line EE in FIG. 4, and FIG. 7B is a cross-sectional view along line J- in FIG. It is an enlarged view of the section in line J. As shown in FIG. 7A, a runner 68 made of a resin material is formed from the side surfaces of the upper mold 80 and the lower mold 60 toward the inside, and a gate 69 made of a resin material is formed on the bottom surface of the cavity 64. The heat-softened resin material is injected into the cavity 64 through the runner 68 and the gate 69. Since the fitting recess 64 side of the cavity 64 is open, the resin material is also filled into the recessed portion formed by the thin portion 42a and the unprocessed portion 42b (see FIG. 3) of the roof molding 10. When the entire cavity 64 is filled with the resin material, the resin material is cooled and cured.

  As shown in FIG. 7A, the back surface of the end wall 42 of the roof molding 10 is exposed in the cavity 64, so that the resin material filled in the cavity 64 is bonded to the end wall 42. Further, as shown in FIG. 7B, since the lower end surface of the convex portion 44 of the roof molding 10 is also exposed to the cavity 64, the resin material filled in the cavity 64 is also bonded to the convex portion 44. Thereby, the bridge | crosslinking part 50 which connects the convex part 44 and a terminal wall is formed, and the terminal wall is hold | maintained in the elastically deformed state.

Next, the periphery of the terminal wall is cut into a desired shape.
As shown to Fig.1 (a), when the peripheral part 43 of the terminal wall 42 is formed larger than a desired shape, the peripheral part 43 is cut | disconnected to a desired shape and an appearance is improved. Thus, the roof molding 10 including the terminal wall 42 is completed. Note that the bridging portion 50 shown in FIG. 1B can also be used as an attachment base when the roof molding 10 is attached to the vehicle.

  As described in detail above, in the method for manufacturing a roof molding according to the present embodiment, a step of forming a convex portion on the back side of the design portion by removing the lower half of the trunk portion at the end portion of the roof molding. And at the tip of the roof molding, removing the back side while leaving the surface of the design part, forming a thin part with a thickness that can be elastically deformed, and placing the molding in the mold and placing the thin part on the back side And a step of forming a terminal wall, and a step of injection-molding a bridging portion that connects the convex portion and the terminal wall in a molding die.

  According to this structure, since a terminal wall is continuously formed from the design part, no joint line appears between them. Further, since the thin portion is bent by elastic deformation, the bent portion is not damaged or whitened. In addition, by bending at normal temperature, it can prevent that the surface of a terminal wall discolors or deform | transforms. Moreover, since the convex portion is formed on the back side of the design portion and the bridge portion that connects the convex portion and the terminal wall is formed by injection molding, the injected resin material may directly contact the back side of the design portion. And no uneven color or sink marks occur on the surface of the design portion. Therefore, the terminal portion can be formed with good appearance. In addition, since the thin-walled portion is bent and the cross-linked portion is injection-molded in the same mold, the manufacturing cost can be reduced.

  The technical scope of the present invention is not limited to the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention. That is, the specific materials and configurations described in the embodiments are merely examples, and can be changed as appropriate. For example, in this embodiment, a material having compatibility with the constituent material of the molding material is adopted as the constituent material of the cross-linking portion, but if an adhesive is applied to the lower end surface of the convex portion and the back surface of the terminal wall in the terminal portion, It is also possible to employ materials that are not compatible.

It is a perspective view of the roof molding concerning this embodiment. It is sectional drawing in the AA line and BB line of Fig.1 (a). It is a back side perspective view which shows the state after the machining of a molding terminal part. It is a perspective view of the lower mold | type and slide mold | type which comprise the shaping | molding die of a bridge | crosslinking part. The roof molding is set on the lower mold and the slide mold. It is sectional drawing of the upper mold | type before and after mold closing, and a lower mold | type. The resin material has been injected. 1 is a perspective view of a vehicle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Molding 12 ... Design part 14 ... Body 40 ... Molding terminal part 42 ... Terminal wall 42a ... Thin part 44 ... Convex part 50 ... Bridge part

Claims (7)

A manufacturing method of a molding that is attached to a vehicle and includes a design part and a body part on the back side of the design part,
Removing the lower half of the body part over a predetermined length from the tip of the molding terminal part, and forming a convex part on the back side of the design part with the remaining upper half part of the body part; and
At the tip of the molding terminal part, by removing the back side of the design part while leaving the surface of the design part, forming a thin part having a thickness that can be elastically deformed;
Placing the molding in a mold, folding the thin portion back to form a terminal wall;
In the mold, a step of injection-molding a bridging portion that connects the convex portion and the terminal wall;
The manufacturing method of the molding characterized by having.   The method for manufacturing a molding according to claim 1, wherein the thin portion is bent at room temperature.   The method for manufacturing a molding according to claim 1, wherein the constituent material of the cross-linking portion is compatible with the constituent material of the molding.   The method for manufacturing a molding according to any one of claims 1 to 3, further comprising a step of shaping the end wall into a desired shape after the step of forming the bridging portion.   The method for manufacturing a molding according to any one of claims 1 to 4, wherein a corner portion of the mold that bends the thin-walled portion and abuts on the thin-walled portion is rounded.   The method for manufacturing a molding according to any one of claims 1 to 5, wherein a plating treatment is applied to a surface of the mold that bends the thin-walled portion and abuts against the thin-walled portion.   A molding produced by using the molding production method according to claim 1.

Images