JPH03200449A - Molding for vehicle and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent generation of warpage in the longitudinal direction of a molding which is fitted on the outside body sheet of a vehicle for the purpose of cushioning or preventing of injury by constituting the molding so that a metallic reinforcing plate having a nearly V-shaped linear projection is embedded in a hollow synthetic resin molded body. CONSTITUTION:This molding is constituted out of a reinforcing plate 1 press- formed of a strip made of a thin metal plate such as stainless steel and a resin molded body 2 of hollow wall body made of synthetic resin material such as polypropylene. The reinforcing plate 1 is formed with flat parts 11 of narrow width on the side end edges in the width direction of the strip, formed so as to have a V-shaped linear projection 13 of roundly bent top part 12A in the main part, and projecting pieces 15 are projectingly provided on the slope parts of the linear projection 13. The resin molded body 2 is provided along the face projecting the linear projection 13 of the reinforcing plate 1, and formed with a first wall body part 21 embedded with the reinforcing plate 1, a flat second wall body part 22 fitted on the outside body sheet of a vehicle, and a third wall body part 23 as a cushioning part and a decorating part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding that is attached to the outer panel of a vehicle body for purposes such as cushioning, damage prevention, or decoration, and a method for manufacturing the same.

[Prior art]

The outer body of a car is protected from damage caused by a door opened by an adjacent car while the car is parked.
A resin molding is sometimes attached to the outermost part of the side of a vehicle to serve as decoration.

In addition, a cushioning band-shaped resin molded product may be attached to the bumper or at the height of the bumper. These are collectively referred to as moldings here.

Molding jigs are usually belt-shaped products made of synthetic resin, and are often hard, but those that require cushioning properties are formed into hollow belt-shaped products by blow molding.

Clips are used to attach these moldings to the outer skin of a vehicle. There is a method (see Japanese Patent Application Laid-open No. 143159/1983) that is embedded in a part of the molding when the engaging rail is blow-molded.

[The invention seeks to solve; problem a]

The molding obtained by blow molding is a hollow molded body of synthetic resin, and it tends to deform and shrink due to the release of molding strain, and expands and contracts due to the resin's unique coefficient of thermal expansion. There have been problems such as the installation work being difficult when installing the product, and a gap being created between the product and the vehicle's outer panel after installation.

The inventor of the present invention believed that molding buried in a part of the rail when blow molding the rail described above would be effective as a measure to prevent deformation, and conducted various experiments. For moldings in which an almost flat metal forming plate is embedded in a part of the molding,
I experienced that the molding warped in the longitudinal direction due to shrinkage of the resin molded part located away from the metal plate.

An object of the present invention is to provide a molding that does not warp in the longitudinal direction after blow molding and a method for manufacturing the same.

[Means to solve the problem]

The present invention provides a hollow synthetic resin molded body formed by blow molding, in which a metal reinforcing plate having at least one protrusion that is substantially U-shaped in the longitudinal direction is embedded. However, the main point is to prevent warpage in the longitudinal direction of the molding by overlapping and interconnecting the 111 parts of the protrusions of the reinforcing plate made of the hollow wall of the resin molded body. be.

The molding for a vehicle of the present invention is made of a thin metal plate, and has at least one protruding ridge formed in a substantially U-shape on one side of the strip, which protrudes along the longitudinal direction. and a resin molded body consisting of a synthetic resin hollow wall attached along the longitudinal direction of the strip on the surface of the reinforcing plate on which the protruding strip is formed. The reinforcing plate is embedded in a wall portion of the resin molded body that is attached and formed along the surface shape of the reinforcing plate, and the wall portion of the resin molded body is located at a position facing the reinforcing plate. is connected to the wall portion attached to the reinforcing plate at the top of the protrusion, and the resin molded body is substantially connected to the embedded protrusion of the reinforcing plate and the wall portion attached thereto. At least two hollow chambers are formed parallel to each other along the longitudinal direction of the buried reinforcing plate.

Further, in the method of manufacturing the vehicle molding according to the present invention, the reinforcing plate, which is made of a hollow cylindrical preform of plasticized thermoplastic resin, is formed on the surface of the reinforcing plate on which the protrusions are provided. a wall portion that is attached to the hollow cylindrical preform and formed along a reinforcing plate made of a part of the cylindrical wall of the preform by gas pressure acting on the inner wall surface of the hollow cylindrical preform in the mold; are embedded in a cylindrical wall made of a part of the preform, and molded along the molding surface of a mold made of the remaining cylindrical wall of the preform, and a cylindrical part formed along the reinforcing plate and the protrusion. By connecting at the top of the reinforcing plate and solidifying the preform, the longitudinal length of the reinforcing plate is substantially separated by the protrusions of the reinforcing plate and the cylindrical wall portions attached thereto, and is buried. This is a method of forming a resin molded body having at least two hollow bodies parallel to each other along the direction.

〔Example〕

FIG. 1 is a cross-sectional view of an embodiment of the vehicle molding of the present invention taken along a line 1h1 perpendicular to the longitudinal direction.
Polypropylene, polyethylene, polyphenylene oxide and polyethylene polymer blend (trade name Noryl)
The resin molded body 2 is composed of a hollow wall body made of a synthetic resin material such as.

The reinforcing plate 1 is a press-formed strip made of a steel plate such as stainless steel or a thin metal plate such as a brass plate, and has a narrow flat portion 11° 11 formed on the side edge in the width direction of the strip. An inverted V-shaped protrusion 13 with a rounded top 12 is formed on the main part thereof in a plane perpendicular to the longitudinal direction of the strip. This protrusion 13 is formed over the entire length of the reinforcing plate 1. Rectangular protrusions 14 extending from the oblique sides of the protrusions 13 are protruded from both ends of the reinforcing plate 1 in the longitudinal direction.
14 are bent inward to face each other.

A large number of protrusions 15, 15, . . . are cut and raised from the strip by V-shaped punching on the oblique side portion of the protruding strip 13, and project from the upper surface of the oblique side portion. Note that the reference numeral 16 indicates an auxiliary hole.

The resin molded body 2 is a hollow cylindrical preformed body (parison) made by plasticizing a resin material, and is attached to the surface of the reinforcing plate 1 on which the ridges 13 are raised and protruding. A first wall portion 21 formed by molding and embedding the reinforcing plate 1, and extending laterally from the end of the portion 21 where the flat portion 11. The flat second wall portions 22.22 to be attached are connected to the outer edges of these flat second wall portions 22.22, and are exposed on the body skin of the vehicle and also serve as a buffer. , a third wall portion 23 which also serves as a decorative portion is molded. The inner wall of the third wall portion 23 is located at the reference numeral 24 at the first wall portion 21 and the top portion 12 of the protrusion 13 of the reinforcing plate 1.
The parts are connected. Due to the gas pressure applied to the inner wall of the hollow cylindrical wall of the preform, the first wall part 21 becomes the reinforcing plate 1, and the second and third Q body parts 22, 23 become the reinforcing member. The resin molded body 2 is formed by being pressed against the molding surface of a mold supporting the plate 1 and solidified. The protruding pieces 15 formed on the reinforcing plate 1 are locked to the wall portion 21 when the reinforcing plate 1 is buried in the first wall portion 21, thereby reinforcing the embedding integration. At both ends of the reinforcing plate 1 in the longitudinal direction, resin molded bodies 2
The third wall portion 23 is convergently superposed on the first and second wall portions 21, 22, and a flat end portion (described later) extending on an extension of the second wall portion 22 is formed. form. In forming this end portion, the protruding piece 14 of the reinforcing plate 1 is formed by the gas pressure acting on the inner wall of the first wall portion 21, so that the protruding piece 14 of the reinforcing plate 1 is
prevent it from entering inside.

In the molding of this embodiment, the reinforcing plate 1 is embedded over the entire length of the resin molded body 2 in the longitudinal direction, and the flat portions 11 on both side edges of the reinforcing plate 1 are in contact with the outer panels of the vehicle body of the resin molded body 2. 2 is buried in the wall portion 22 of the projecting strip 1.
3 is embedded in the first wall part 21, and the third wall part 23 of the resin molded body 2 forming the outer wall of the molding is the first wall attached to the top part 12 of the protrusion 13 of the reinforcing plate 1. Since the body portion 21 and the portion 24 are joined, even if deformation or shrinkage occurs due to opening of the mold, the resin molded body 2
The first wall portion 21 of the reinforcing plate 1 is embedded in the protrusion 13, and the third wall portion 23 is connected to the first wall portion 21 at the portion 24, so that the longitudinal direction of the molding is Warping is prevented by the reinforcement of strength due to the formation of the protrusions 13 on the reinforcing plate 1, and no warping occurs.

The inner space of the resin molded body 2 is substantially partitioned by the ridges 13 of the buried reinforcing plate 1 and the first wall portion 21 attached to the ridges 13, and the inner space is reinforced. Board 1
2 parallel to each other on both sides of the protrusion 13 along the longitudinal direction of the
A hollow chamber 25°25 is formed, and when a foreign object such as an etched door of a vehicle parked next to it collides with it, a moderate buffering effect is obtained, and the outer body panel of the vehicle to which the molding is attached is prevented from being damaged. Protect.

The molding of this embodiment is suitable for fixing to the outer body panel of a vehicle by applying double-sided adhesive tape to the second wall portion 22 of the resin molded body 2.

FIG. 3 is a sectional view taken along a plane perpendicular to the longitudinal direction of another embodiment of the molding for a vehicle according to the present invention, and the molding has the same reinforcing plate 3 as shown in the oblique view in FIG. The resin molded body 4 is composed of a hollow wall body made of a resin material.

The reinforcing plate 3 is also press-formed from a thin metal strip made of the same material as in the previous embodiment. In this example,
In a cross section perpendicular to the longitudinal direction, a wide flat part 31 is formed at the center of the strip, and two inverted U-shaped protrusions 32 are formed on both sides of the flat part 31 to form a wide flat part 31. The side edges form small L-shaped bent edge portions 33, 33. These flat portions 31, protrusions 32, and edge portions 33 are formed over the entire length of the strip in the longitudinal direction. Said protrusion 32°32
The top part 34 is formed into a smooth surface over its entire length, and a number of small holes 35 are bored in the side parts. Flat part 31
A number of elongated holes 36 and auxiliary holes 37 are drilled in the hole 36 for locking the clip 5 for attaching the molding to the outer panel of the vehicle. A rectangular protrusion 38 extending from the flat part 31 is provided at both ends in the longitudinal direction of the flat part 31 of the strip, and is bent so as to protrude perpendicularly in the same direction as the direction in which the protrusion 32 is raised. The reinforcing plate 3 is constructed by the following. Note that the reinforcing plate 3 of this example
, a plurality of concave portions 39 are formed at appropriate positions on the top portion 34 of each protrusion 32. The concave portion 39 has a small dimension in the longitudinal direction of the protrusion 32, and the height from the flat portion 31 to the concave portion 39 is slightly lower than the height from the flat portion 31 to the top portion 34.

The resin molded body 4 is a plasticized hollow cylindrical preformed body (
A first wall portion 41 is attached as a resin parison on the surface of the reinforcing plate 3 on which the protrusion 32 is raised and is formed along the surface of the reinforcing plate 3, in which the reinforcing plate 3 is embedded. and,
A flat second wall portion 42.42 extends laterally from the end of the portion 41 in which the cursor-shaped edge portion 33 is embedded and is attached to the outer body plate of the vehicle; A third wall portion 43 is formed by connecting the outer edges of the wall portions 42, 42 and exposed on the outer skin of the vehicle body, and serving as a buffer portion and a decorative portion.

The inner wall of this third wall portion 43 is formed at the first wall portion 41 and the top portion 34 of the protrusion 32 of the reinforcing plate 3.
They are connected at a portion indicated by reference numeral 44. The preliminary resin molded body has a hollow cylindrical shape, and gas pressure is applied to the inner wall of the wall to cause the first wall portion 41 to form the reinforcing plate 3.
Then, the second and third wall portions 42 and 43 are pressed and molded onto the molded surfaces supporting the reinforcing plate 3, respectively, and solidified to form the resin molded body 4. The preform enters the through hole 35 formed in the side part of the protrusion 32 of the reinforcing plate 3 and the auxiliary hole 37 formed in the flat part 31 by gas pressure, and the first wall part 41 and the reinforcing plate 3 to ensure adhesion. As shown in FIG. 3, if the clip 5 is previously locked in the elongated hole 36 of the reinforcing plate 3, the head 51 of the clip 5 will be embedded in the first wall portion 41. The clip 5 is a rod having a rectangular head 51 having a width narrower than the width of the elongated hole 36 formed in the flat part 31 of the reinforcing plate 3 and a length larger than the width of the elongated hole 36, and a locking part 52. The locking pawls 54, 54 are integrally formed at the tip of the elongated hole 36 with the longitudinal direction of the head 51 parallel to the longitudinal direction of the elongated hole 36.
By inserting the reinforcing plate 3 into the inner part and rotating it by 90 degrees, the flat part 31 of the reinforcing plate 3 is interposed between the head 51 and the locking part 52 and is locked. The protruding piece 38 provided at the longitudinal end of the reinforcing plate 3 forms the longitudinal end of the third wall portion 43 of the resin molded body 4 .

In the molding of this embodiment, as in the previous embodiment, the reinforcing plate 3 is buried, and the wall portion attached to the top of the protrusion 32 of the first wall portion 41 and the third wall portion 43 are buried. Since they are joined by the portion 44, the molding is prevented from warping in the longitudinal direction. In this embodiment, two protrusions 32, 32 are protruded parallel to each other on the reinforcing plate 3.
．． 32, and is joined by a third wall portion 43 and a top portion 44 of the raised portion, and the interior space of the resin molded body 4 is divided into three mutually parallel hollow chambers 45, 45. It is practically divided into 45 parts, and it is sure to prevent warping! ! The opposition effect is also good.

Next, a method for manufacturing a molding for a vehicle according to the present invention will be explained. FIG. 5 is a conceptual diagram showing an example of a method for manufacturing the molding shown in FIG. 1, and FIG. 6 is a cross-sectional view of the mold. The reference numerals attached to the moldings in the figures refer to the parts described in FIGS. 1 and 2 with the same reference numerals.

A pair of molds 61 and 62 are used in this method. 1st
In the cross section perpendicular to the longitudinal direction of the mold 61, the reinforcing plate 1 is placed between the two flat IEC-shaped surfaces 63 and 63 that form the second wall portion 22 of the resin molded body 2. Projection 13
A chain 64 having a trapezoidal cross section is formed to lock the holder from the back side. This chain 64 positions the reinforcing plate 1 at a predetermined position on the mold 61. A concave second molding surface 65 for molding the third wall portion 23 of the resin molded body 2 is formed in the second mold 62, and extension portions 66 at both ends of the second molding surface 65. 66 to fit into the first mold 61 to form a molding space. Fifth
In the cross section along the longitudinal direction shown in the figure, the second mold 6
The second oval-shaped surface 65 of No. 2 includes a third oval-shaped surface 67 extending in the longitudinal direction beyond the end of the chain 64 of the first mold 61.

The pair of molds 61 and 62 are separated, and the first mold 61
The reinforcing plate 1 is supported by the first mold 61 by attaching the protrusion 13 to the chain 64. Next, the resin materials to form the resin molded body 2 are heated to a temperature of 150 to 230°C depending on each material to plasticize it, and are extruded into a cylindrical shape from a die head 71 to form a hollow preformed body (parison) 72. . The length of this preformed body 72 is sufficiently longer than the length of the molds 61 and 62, and its tip is connected with a known parison pinch 7
3 to close and hold the preformed body 72 by pressing it flat, air is sealed inside the preformed body 72 from the die head 71, and the molds 61 and 62 are closed. The preform 72 is pressed between the molds 61 and 62 at both ends in the longitudinal direction of the molds from the third oval surface 67 of the second mold 62, and both ends are closed.
1 and 62, and in particular, the volume of the internal space is reduced by the chain 64 of the first mold 61 and the protrusion 3 of the reinforcing plate 1 supported by the chain 64. Therefore, the preform 7 is trapped in the internal space.
The pressure of the air acting on the inner wall surface of the reinforcing plate 1 increases, and the preformed body 72 in a plasticized state is pressed against the reinforcing plate 1 and the first to third forming surfaces 63, 65° 67, thereby embedding the reinforcing plate 1, While molding the whole, the wall portion of the preform 72 attached to the top 12 of the protrusion 13 of the reinforcing plate l and the second molding surface 6
5 is joined to the wall portion of the preformed body 72 at the portion 24. Since there is a slight gap between the third preformed surface 67 of the second mold 62 and the end of the chain 64 of the first mold 61, the preform is pressed against the third preformed surface 67. A space is formed between the wall portion of the body 72 and the wall portion of the preform 72 pressed against the protruding piece 14 of the reinforcing plate 1, and this space is joined by the portion 24 and the protruding piece of the reinforcing plate 1 Article 13
2 separated by the wall part of the preformed body 72 attached to the
It communicates with the rain hollow chambers 25.25 to equalize the air pressure within the rain hollow chambers 25.25.

In the pond water embodiment, a preform 72 extruded into a cylindrical shape from a die head 71 is cut into a predetermined length,
Close both ends with sufficient air trapped in the internal space,
This is applied to the second and third molding surfaces 65 and 6 of the second mold 62.
Place it along 7.

After that, both molds 61 and 62 are closed, and the preformed body 72 is
A preformed body 72 can be formed in the same manner as described above even if both ends in the longitudinal direction are closed with molds 61 and 62. Alternatively, a thermoplastic resin pipe that has been cut to a predetermined length and cooled and solidified is heated to its plasticizing temperature, both ends are closed, and the both ends are placed along the molding surfaces 65 and 67 in the same manner as described above. .62 may be closed.

After the preform 72 is molded and cooled and solidified, both molds 6
1.62 is separated, the molded resin body 2 is taken out, the excess resin is cut off, and the burrs are removed to obtain a molding having the cross section shown in FIG.

FIG. 7 is a conceptual diagram showing an embodiment of the method for manufacturing the molding shown in FIG. 3, and FIG. 8 is a cross-sectional view of the mold. The numbers attached to the moldings in the figure are number 31i.
@, the parts described in FIG. 4 are indicated by the same reference numerals.

A pair of molds 81 and 82 are also used in this method. In the cross section perpendicular to the longitudinal direction of the first mold 81, the protrusions 32, 32 of the reinforcing plate 3 are attached from the back side to both sides of a flat part 83 on which the flat part 31 of the reinforcing plate 3 is placed in the center. Two locking chains 84 having a substantially inverted U-shaped cross section are formed,
A flat first molding surface 85 for molding the second wall portion 42 42 of the resin molded body 4 is formed on the outside of these chains 84 . The chain 84 positions the reinforcing plate 1 at a predetermined position on the mold 81, and at a predetermined position on the top of the chain 84, there is a concave portion 3 formed at the top 34 of the protrusion 32 of the reinforcing plate 3.
A recessed portion 86 is formed into which the receptacle 9 is inserted. Second mold 82
A concave second molding surface 87 for molding the second wall portion 42 of the resin molded body 4 is formed, and both ends of the second oval-shaped surface 87 extend perpendicularly to the first molding surface 85. Extension part 88 of lever
This fits into the first mold 81 to form a molding space.

A protruding strip 89 protruding toward the chain 84 is formed in a portion of the second molding surface 87 corresponding to the chain 84 of the first mold 81 . These chains 84 and protrusions 89 are formed by a mold 81,
It extends parallel to the longitudinal direction of 82.

A plurality of rectangular holes 90 (see FIG. 8) are formed in the planar portion 83 of the first mold 81 in its longitudinal direction. This rectangular hole 90 is for storing the clip 5 when molding the resin molded body 4 after the clip 5 has been previously secured to the reinforcing plate 3.

The pair of molds 81 and 82 are separated, and the first mold 81
The reinforcing plate 3 is supported by the reinforcing plate 3. When the clip 5 is locked to the reinforcing plate 3, the clip 5 is inserted into the rectangular hole 90 at the appropriate position.
After that, the protrusion 32 of the reinforcing plate 3 is placed in the first mold 81.
The chain 84 is covered with a crown.

Similar to the embodiment described above, a cylindrical hollow preform 72 extruded from a die head 71 is closed and gripped with parison pinches 73, air is sealed inside the preform 72, and a mold 81 is formed.
, 82 close. The volume of the internal space of the preformed body 72 is reduced by the chains 84, 84 of the first mold 81 and the protrusions 32 of the reinforcing plate 3 supported by the chains 84, and the air pressure in the internal space increases. Therefore, the wall of the preformed body 72 in a plasticized state expands outward in the molding space due to the gas pressure acting on the inner wall surface, and the wall pressed onto the surface of the reinforcing plate 3 expands the reinforcing plate 3. The walls embedded to form the first wall portion 41 and pressed against the first and second oval surfaces 85.87 form the second and third wall portions 42.43, respectively, and Between the protrusion 89 formed on the second molding surface 87 of the second mold 82 and the top 34 of the protrusion 32 of the reinforcing plate 3, 43 and are joined at a portion 44. At this time, a plurality of recesses 39 are formed on the top 34 of the protrusion 32 of the reinforcing plate 3, and the top of the recess 39 is located at a lower position than the remaining top 34.
Between the walls of the two layers of preform 72 that are joined at section 44 there is a small unjoined section, which leads to gas passages 91
Therefore, the hollow portion located between the protrusions 32 of the reinforcing plate 3 and the hollow portions located on both sides of the protrusion 32 communicate through the gas passage 91, and the pressure distribution inside the preform 72 is equalize. Rectangular protrusions 38 formed at both longitudinal ends of the flat portion 31 of the reinforcing plate 3 are sandwiched between the two wall layers of the preform 72, and both longitudinal ends of the protrusions 32 are formed on both longitudinal ends of the preform 72. It is closed by two layers of walls.

After the preformed body 72 is molded and cooled and solidified, the two whole molds 81 and 82 are separated, the molded resin body 4 is taken out, and the excess resin is cut and deburred. A molding with the cross section shown in the figure is obtained.

In this embodiment, similarly to the previous embodiment, a preform 72 extruded into a cylindrical shape from a die head 71 is cut into a predetermined length and inserted into the molding spaces of the molds 81 and 82, and a pre-solidified material is used. It is possible to adopt a method in which a tubular thermoplastic synthetic resin pipe is heated to a plasticizing temperature and then inserted into both molds 81 and 82 for molding.

In the above embodiment and this embodiment, as a method for supplying gas pressure to act on the inner wall of the resin preform 72 while molding the resin preform 72 using the pair of molds, the first mold 61, 81 is Auxiliary hole 16 formed in reinforcing plate 1°3.
A needle-shaped body 92 disposed at a position corresponding to 37 may be made to be able to penetrate the wall of the preformed body 72, and gas pressure may be introduced into the inner cavity of the preformed body 72 from this needle-shaped body 92. .

[Operation and effects of the invention]

The vehicle molding of the present invention has at least one U-shaped ridge formed on one surface of a thin metal plate.
a reinforcing plate consisting of a strip on which a plurality of protrusions are protruded along the longitudinal direction; The reinforcing plate is attached to the wall portion of the resin molding that is attached to the surface on which the protrusions of the reinforcing plate of the resin molding protrude. is buried,
The wall portion of the resin molding at a position facing the protrusion is connected to the wall portion attached to the protrusion of the reinforcing plate at the top of the protrusion, so that the body of the vehicle, etc. When installed as a molding or after installation,
Even if the walls of the resin molding, which serve as the buffer and decoration parts of the molding, are deformed or expanded due to the release of distortion during molding or due to the coefficient of thermal expansion inherent to the resin, the bulge will essentially form an inverted U-shape. At least the reinforcing plate on which the protrusions are formed has a high strength to withstand curvature in the longitudinal direction, so that the molding does not warp or curve. The surface of the molding is substantially delimited by the wall portion attached to the molding, and forms at least two hollow chambers extending along the longitudinal direction of the embedded reinforcing plate and parallel to each other. The wall portion of the resin molded body constituting the buffer section has at least two wall portions arranged in parallel in the longitudinal direction, each of which has at least one side edge supported by the top of the protrusion of the reinforcing plate. This results in a stable buffering effect.

When the reinforcing plate is provided with a protrusion or hole formed by punching a strip, the wall of the resin molded body attached to this is covered, so that the reinforcing plate has a projection or a hole formed by punching out a strip. Fixation is further strengthened.

Further, the method for manufacturing a vehicle molding of the present invention includes a reinforcing plate made of a hollow cylindrical preform of a plasticized thermoplastic synthetic resin on the surface of the reinforcing plate on which the protrusions are provided. A wall formed along a reinforcing plate formed of a part of the wall portion of the preform by gas pressure acting on the inner wall surface of the hollow cylindrical preform in the mold. It is buried in a wall part made up of a part of the body part,
The remaining wall portion of the preform is molded by a molding surface of a mold, and the wall portion formed along the reinforcing plate is connected to the top of the protrusion, and the preform is solidified. At least two hollow spaces are substantially defined by the protrusion of the reinforcing plate and the wall portion attached thereto, and are parallel to each other along the longitudinal direction of the buried reinforcing plate. It is characterized by forming a resin molded body having a chamber. Therefore, when supporting the reinforcing plate in the mold, the protrusions formed on the reinforcing plate can be used, and gas pressure can be applied to the inner wall surface of the plasticized thermoplastic synthetic resin preform. Since the reinforcing plate is crimped to the reinforcing plate, the wall portion of the preform is crimped perpendicularly to the illumination surface on each side of the reinforcing plate supported by the mold, and no lateral force is applied.
There is no need to temporarily fix the reinforcing plate to the mold, and it is sufficient to position it in a fixed position using a protrusion such as a chain. Since the preform is molded into a plasticized hollow cylinder, even if the reinforcing plate has protrusions or holes formed by punching, there will be openings with a slightly larger area, such as the end faces of the protrusions of the reinforcing plate. Even if the resin material does not flow out from these holes or openings, it bulges out and enters the holes or openings, making a good connection with the reinforcing plate, and making the reinforcing plate a part of the wall part of the preform. to be buried. Furthermore, the wall portion of the preform other than the wall portion attached to the reinforcing plate and formed by embedding the reinforcing plate is pressed against the molding surface of the mold by the gas pressure acting on the inner wall surface and molded. At the same time, for the wall part that is attached and molded along the protrusion formed by the wall part located at a position opposite to the protrusion of the reinforcing plate.

By polymerizing and connecting at the tops of the ridges, the interior of the resin molded body formed by solidifying the preform is substantially filled with the ridges of the reinforcing plate and the wall portions attached thereto. At least two hollow chambers parallel to each other are formed along the longitudinal direction of the buried reinforcing plate, so that the manufactured molding does not shrink due to shrinkage in the wall portion of the resin molded body after being manufactured. Even if deformation is likely to occur, the wall portion in which the reinforcing plate is buried will be prevented from deforming due to shrinkage, and the wall portion made of resin, located at a position facing the protrusion of the reinforcing plate, will have the reinforcing plate buried at the top of the protrusion. Since the reinforcing plate overlaps and connects with the wall portion in which the molding is buried, deformation due to contraction thereof is also prevented by the reinforcing plate, and warping in the longitudinal direction of the molding due to substantial contraction deformation does not occur.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of a vehicle molding of the present invention, and FIG. 2 is a perspective view with a part of the longitudinal direction of a reinforcing plate used in the embodiment omitted. FIG. 3 is a sectional view of another embodiment of the molding for a vehicle according to the present invention, FIG. 4 is a perspective view with a part of the reinforcing plate omitted, and FIG. 5 is a cross-sectional view of the molding shown in FIG. 1. A schematic diagram showing an example of the manufacturing method, FIG. 6 is a cross-sectional view of a mold used in the manufacturing method, and FIG. 7 is a schematic diagram showing an example of the manufacturing method of the molding shown in FIG. 3. , FIG. 8 is a sectional view of a mold used in the manufacturing method. In the figure, the following symbols indicate the following parts, respectively. 1.3... Reinforcement plate, 2,4...
Resin molded body, 1st Figure 25.45... Hollow chamber, 35... Hole, 72... Preformed body. 15...Protrusion, 71...Die head,

Claims (3)

[Claims] (1) Consisting of a thin metal plate, substantially U on one side
a reinforcing plate made of a strip having at least one protruding ridge formed in a letter-like shape protruding along the longitudinal direction; and a resin molded body consisting of a hollow wall body of synthetic resin attached along the longitudinal direction of the strip, and the reinforcing plate is the resin molded body attached and molded along the surface shape of the reinforcing plate. The wall portion of the resin molded body is embedded in the wall portion of the body and is located opposite to the reinforcing plate.
The resin molded body is connected to the wall portion attached to the reinforcing plate at the top of the protrusion, and the resin molded body is connected to the embedded protrusion of the reinforcing plate and the wall portion attached thereto. 1. A molding for a vehicle, characterized in that at least two hollow chambers are formed which are substantially separated from each other and extend along the longitudinal direction of an embedded reinforcing plate and are parallel to each other. (2) The reinforcing plate has a protrusion or a hole formed by punching a strip, and is covered with a wall portion of a resin molded body attached to the protrusion or hole. Moldings for vehicles described in section. (3) Consisting of a thin metal plate, substantially U on one side.
A reinforcing plate consisting of a strip in which at least one protrusion formed in a letter-shaped protrusion protrudes along the longitudinal direction, and a plasticized thermoplastic synthetic resin is applied to the surface on which the protrusion protrudes. A hollow cylindrical preform is attached along the longitudinal direction of the reinforcing plate, and the wall of the preform is caused by gas pressure acting on the inner wall surface of the hollow cylindrical preform in the mold. A part of the part is molded along with the reinforcing plate, the reinforcing plate is embedded in the wall part, and the remaining wall part of the preform is molded by the molding surface of the mold. , by connecting the wall portion formed along the reinforcing plate at the top of the protrusion, and solidifying the preform, the protrusion of the reinforcing plate and the wall portion attached thereto are connected. A method for producing a molding for a vehicle, comprising forming a resin molded body having at least two hollow chambers parallel to each other along the longitudinal direction of the reinforcing plate that are substantially partitioned by and embedded in the reinforcing plate. .