JPH07106578B2 - Plastic spoiler and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic spoiler in which the abutting portions of both halves, which are pre-injection-molded by being divided into upper and lower halves, are joined by secondary injection, and a method for manufacturing the same. .

[0002]

2. Description of the Related Art Conventionally, as a plastic spoiler for automobiles, abutment portions around both half halves which are pre-injection-molded by being divided into upper and lower parts are formed by joining by a secondary injection. What is done is considered. In this way, by performing the molding of the preform and the joining process of the two by injection molding that can obtain a molded product with high productivity and good appearance, a spoiler with a hollow shape and light weight and good appearance can be efficiently manufactured. It can be produced well.

[0003]

However, when the spoiler is manufactured by the above method, when the two halves are abutted in the molding die and the secondary injection is performed, the outer surface of each half and the die are Since it is difficult to maintain close contact with the molding surface, the resin for bonding protrudes from the gap between the two and adheres to the outer surface side of the half body, which remains as burrs in the product. Conventionally, in the post-process after molding, the burr is removed by a mechanical method such as a grinder work, but it takes a lot of time and labor and the finishing work after the removal is difficult and the appearance is impaired. There was a problem that

The present invention has been made in view of the above problems, and when two half-split bodies, which are divided into two and preliminarily injection-molded, are joined by secondary injection, the half-split bodies are connected to the outer surface side. An object of the present invention is to provide a plastic spoiler capable of preventing the bonding resin from protruding and a method for manufacturing the same.

[0005]

Therefore, in the plastic spoiler according to the first invention of the present application, the abutment portions around the two halves, which are pre-injection-molded by dividing the upper and lower parts into two, are secondary. In a plastic spoiler joined by injection, the inner peripheral surface of the peripheral portion of one half of the two half bodies, and the outer peripheral surface of the peripheral portion of the other half body, butts, An inclined portion is formed on at least one of the outer peripheral surface and the inner peripheral surface.

Further, in the method for manufacturing a plastic spoiler according to the second invention of the present application, the abutting portions around the two halves, which are pre-injection-molded by dividing the upper and lower halves, are joined together by secondary injection. In a manufacturing method for manufacturing a plastic spoiler by using at least one of the inner peripheral surface of the peripheral portion of one of the two half bodies and the outer peripheral surface of the peripheral portion of the other half body. It is formed by the inner peripheral surface, the outer peripheral surface and the molding die surface in a state where an inclined portion is provided and the inner peripheral surface and the outer peripheral surface are abutted against each other through the inclined portion in the molding die. The halves are joined together by injecting and filling a joining resin into the space.

[0007]

According to the first invention of the present application, when the peripheral portions of both halves are abutted in the mold, the peripheral portions press each other through the inclined portions. By the action of this inclined portion, the outer surface of each half body is strongly pressed against the molding surface of the mold. Therefore, in this state, even if the joining resin material is injected and injected into the abutting portion and the secondary injection is performed, the joining resin does not stick out to the outer surface of each of the half halves.
That is, it is possible to prevent the occurrence of burrs, reduce the number of steps in the post-process, and improve the appearance of the spoiler.

Further, according to the second invention of the present application, when the peripheral portions of the two half-divided bodies are abutted with each other in the molding die, the peripheral portions are pressed against each other through the inclined portions. By the action of this inclined portion, the outer surface of each half body is strongly pressed against the molding surface of the mold. Then, in this state, by injecting and injecting the joining resin material into the space portion and performing the secondary injection, it is possible to prevent the joining resin from protruding to the outer surface of each half body. That is, it is possible to prevent the occurrence of burrs, reduce the number of steps in the post-process, and improve the appearance of the spoiler. Further, since the injection molding method can be applied without any trouble, it is possible to efficiently produce a spoiler having a hollow shape, light weight, and good appearance.

[0009]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. As shown in FIG. 7, a plastic spoiler 1 for an automobile according to this embodiment has an upper half body 2 and a lower half body 3 which are vertically divided into two and overlap each other, and a peripheral portion 2a thereof. , 3a are abutted against each other and joined to each other to form a hollow shape, which is attached to the vehicle body 9 by the leg portions 3c of the lower half-split body 3.

Next, a method of manufacturing the plastic spoiler 1 will be described. FIG. 1 shows the spoiler 1 described above.
FIG. 6 is a cross-sectional explanatory view of the molding die 11 and the half divisions 2 and 3 showing the preforming step of each of the half divisions 2 and 3, and as shown in the figure, the molding die 11 includes a fixed die 21 and Movable die 31 slidable vertically with respect to the fixed die 21
The movable mold 31 includes an upper molding surface 32 forming the inner surface side of the upper half body 2 of the spoiler 1, and
A lower molding surface 33 that forms the outer surface side of the lower half-split body 3 is formed, while the fixed mold 21 has an upper molding surface 22 that forms the outer surface side of the upper half-split body 2 of the spoiler 1 and a lower half-split surface. A lower molding surface 23 which forms the inner surface side of the body 3 is formed. Further, the movable mold 31 is provided with an upper gate portion 34 opening to the upper molding surface 32 and a tunnel-shaped lower gate portion 35 opening to the lower molding surface 33, and these gate portions 34, 35 are both The movable die 31 communicates with a runner portion 36 that is provided in the center of the die-matching surface. Incidentally, below the mold matching surface of the movable mold 31, as will be described later in detail, a joining resin injection portion 37 that acts as a runner portion and a gate portion at the time of secondary injection is provided. On the other hand, a substantially hole-shaped sprue portion 24 to which an injection nozzle 15 for injecting a material resin into the mold is connected is formed in a substantially central portion of the fixed mold 21.

Then, the movable die 31 is set to the vertical position shown in FIG.
The upper molding space 12 for molding the upper half body 2 and the lower molding space 13 for molding the lower half body 3 by clamping 1
Are formed at the same time, and the sprue portion 2 of the fixed mold 21 is formed.
4 and the runner portion 36 of the movable die 31 communicate with each other. In this mold clamped state, the melted material resin is injected from the injection nozzle 15 to generate the sprue portion 2
4 and the runner portion 36, and the respective gate portions 34 and 35, the material resin is filled into the upper and lower molding spaces 12 and 13, respectively, and the upper half body 2 and the lower half body 3 as preforms are filled.
And can be injection molded at the same time. After the completion of the preliminary injection molding, a predetermined time has elapsed and the material resin has cooled and solidified, and then the mold is opened to separate the movable mold 31 from the fixed mold 21. At this time, as shown in FIG.
Is ejected so as to be held on the fixed mold 21 side, and the lower half-divided body 3 is held on the movable mold 31 side, and the flesh portion 4 at the time of injection injection is removed.

Next, as shown in FIG. 3, the movable die 31 is slid upward with respect to the fixed die 21 so that the preformed half halves 2 and 3 face each other. After setting the vertical position of 31, both molds 21,
31 is clamped again. As a result, as shown in FIG.
The upper half-divided body 2 and the lower half-divided body 3 are abutted against each other at their peripheral portions 2a and 3a. At this time, the sprue portion 24 of the fixed die 21 and the joining resin injection portion 3 for the secondary injection of the movable die 31 are also provided.
The position and size of the resin injecting portion 37 are set in advance so that the resin injecting portion 37 communicates with the resin injecting portion 37. The joining resin injection part 37
When the lower molding surface 33 of the movable mold 31 is combined with the upper molding surface 22 of the fixed mold 21, it opens to the lower molding surface 33 of the movable mold 31 (see FIG. 4). ,
At the time of preforming in which the lower molding surfaces 23 and 33 of 31 are combined, they are closed by the projections 25 formed along the peripheral edge of the lower molding surface 23 of the fixed mold 21 (see FIG. 1). .

In this embodiment, as a result of the protrusion 25 being provided on the lower molding surface 22 side of the fixed mold 21, the peripheral portion 3a of the lower half-split body 3 is the peripheral portion 2a of the upper half-split body 2. It is located on the inner side and is formed so as to project toward the upper half-divided body 2 side. Therefore, when the two halves 2 and 3 are abutted, as shown in detail in FIG. 6, the inner peripheral surface of the peripheral portion 2a of the upper half body 2 and the peripheral portion 3a of the lower half body 3 are Abut on the outer peripheral surface. Further, in this embodiment, the peripheral portion 2 of the upper half-split body 2 is
At least one of the inner peripheral surface of a and the outer peripheral surface of the peripheral portion 3a of the lower half-divided body 3, more preferably both, the inclined portions 2b, 3
b are formed respectively, and the inclined portions 2b and 3b are formed at the same inclination angle so that they can be combined with each other. Therefore, the peripheral parts 2a, 3a of the two halves 2, 3
When they are abutted against each other in the molding die, both peripheral portions 2a, 3
a presses each other via the inclined portions 2b and 3b, and the outer surfaces of the half-split bodies 2 and 3 are strongly pressed against the molding surfaces 22 and 33 by the action of the inclined portions 2b and 3b. .

Then, in this state, the injection nozzle 1
Secondary injection is performed in which the molten joining resin material 5 is injected and injected from 5 to the abutting portion between the two halves 2, 3. That is, the inner peripheral surface of the peripheral portion 2a of the upper half-split body 2, the outer peripheral surface of the peripheral portion 3a of the lower half-split body 3, the lower molding surface 33 of the movable mold 31, and the upper molding surface 22 of the fixed mold 21. The resin 5 for bonding is filled in the space 14 formed by and, and the upper half 2
And the lower half-split body 3 are joined together at their peripheral portions 2a, 3a. At this time, since the outer surfaces of the half-divided bodies 2 and 3 are strongly pressed against the molding surfaces 22 and 33, the bonding resin 5 does not protrude to the outer surfaces of the half-divided bodies 2 and 3.

After the joining resin 5 is cooled and solidified, the mold 1 is opened again to take out the product 1 (spoiler) as shown in FIG. 5, and the fillet portion 6 at the time of the secondary injection is removed. . In this case, since there is no protrusion of the joining resin 5 to the outer surface side of the spoiler 1 and burrs are hardly generated,
Finishing work after molding is simple.

As described above, according to this embodiment, when the peripheral portions 2a, 3a of the two halves 2, 3 are abutted with each other in the molding die, both peripheral portions 2a, 3a are 3a press each other through the inclined portions 2b, 3b, and the inclined portions 2b, 3b
By the action of, the outer surface of each half body 2, 3 is formed on the molding surface 22,
It is strongly pressed against 33. Therefore, in this state, even if the joining resin material 5 is injected and injected into the abutting portion and the secondary injection is performed, the joining resin 5 does not protrude to the outer surface of each of the halves 22, 33. That is, it is possible to prevent the occurrence of burrs and reduce the number of steps in the post-process, and it is possible to improve the appearance of the spoiler 1. Also,
Since the injection molding method can be applied without any trouble, it is possible to efficiently produce the spoiler 1 which is hollow and lightweight and has a good appearance.

In the above embodiment, the inclined portions 2b and 3b are formed on both the inner peripheral surface of the peripheral portion 2a of the upper half-split body 2 and the outer peripheral surface of the peripheral portion 3a of the lower half-split body 3, respectively. However, the same effect can be obtained by forming it on only one side.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of each half body and a molding die showing a preliminary injection molding process of a plastic spoiler according to an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view of each half body and a molding die showing a mold opening state after the preliminary injection molding.

FIG. 3 is an explanatory cross-sectional view of each half body and a molding die showing a sliding state of the movable die after the die is opened.

FIG. 4 is a cross-sectional explanatory view of each half body and a molding die showing a secondary injection process of the spoiler.

FIG. 5 is a cross-sectional explanatory view of a spoiler and a molding die showing a mold open state after the secondary injection.

FIG. 6 is an enlarged cross-sectional view of an abutting portion of the spoiler.

FIG. 7 is a cross-sectional explanatory view showing a mounting state of the spoiler on a vehicle body.

[Explanation of symbols]

 1 ... Spoiler 2 ... Upper half body 3 ... Lower half body 2a, 3a ... Peripheral part of half body 2b, 3b ... Inclined part 5 ... Bonding resin 22, 33 ... Molding surface

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Claims (2)

[Claims] 1. A plastic spoiler in which the abutment portions around the two half-split bodies, which have been vertically preliminarily injection-molded in two, are joined by secondary injection. The inner peripheral surface of the peripheral portion of one of the half-divided bodies and the outer peripheral surface of the peripheral portion of the other half-divided body are abutted, and an inclined portion is provided on at least one of the outer peripheral surface and the inner peripheral surface. A plastic spoiler characterized by being formed. 2. A manufacturing method for manufacturing a plastic spoiler by joining the abutting portions of both halves, which have been pre-injection-molded by dividing the upper and lower parts into two, by secondary injection. An inclined part is provided on at least one of the inner peripheral surface of the peripheral part of one half of the split parts and the outer peripheral surface of the peripheral part of the other half, and in the molding die, By injecting and filling a bonding resin into the space formed by the inner peripheral surface, the outer peripheral surface and the molding die surface in a state where the peripheral surface and the outer peripheral surface are abutted against each other via the inclined portion, A method for manufacturing a plastic spoiler, which is characterized by joining halves.