JP2000102969A - Closure structure of opening part of hollow body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the closure structure of the opening part of a hollow body not required in high processing accuracy and excellent in appearance. SOLUTION: A part of the outer shell part 3 of a hollow part is cut out and the cut-out piece 7 is removed to form an opening part 5 and the cut-out piece 7 is used to again close the opening part 5. The cutting out angle at a time when an outer shell part 3 is cut out by a cutter is set to the angle of inclination formed when the cut surface of the outer shell part 3 is formed into an inclined surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closing structure for closing an opening of a hollow body. More specifically, the present invention relates to a method of forming an opening in a hollow body by cutting the opening and using a cut piece obtained by the opening as a closing body. A closure structure suitable for use.

[0002]

2. Description of the Related Art Conventionally, as a structure for closing an opening of a hollow body, a structure in which the opening is closed using a lid separately prepared in advance according to the shape of the opening has been generally used.

[0003]

However, for example, when an opening is formed in a blow-molded hollow body so as to cut out a portion after molding, the opening is closed and the closed surface is simulated before cutting. In order to restore the shape, there is a problem that the shape of a separately manufactured lid must exactly match the opening, and a high degree of processing accuracy is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and more specifically, it is an object of the present invention to provide a structure for closing an opening of a hollow body which does not require a high degree of processing accuracy and is excellent in appearance. The purpose is.

[0005]

The object is effectively achieved by the inventions according to claims 1 to 5 of the present invention. In the configuration of the invention according to claim 1, an opening is formed by cutting a part of the outer shell of the hollow body so as to open with an inclined surface facing outward, and the opening is formed by cutting. The opening structure of the hollow body is characterized in that cutout pieces of the outer shell are fitted together.

That is, according to the present invention, a part of the outer shell portion of the hollow portion is cut out, the cut piece is removed to form an opening, and the opening is closed again using the cut piece. The cutting angle when the outer shell is cut by the cutter is defined as an inclination angle at which the cut surface of the outer shell faces outward to form an inclined surface.

[0007] The opening of the outer shell portion thus cut out opens with an inclined surface facing outward, and conversely, the inner peripheral surface of the outer shell portion of the cut piece forms an inclined surface. Since the shape of the opening and the outer shape of the incision piece have a difference corresponding to the cutting width of the cutter, both have very similar shapes. In addition to its excellent properties, there is no problem of affinity for welding or the like. Further, since the cut piece does not fall into the hollow body from the opening due to the inclined surface, the opening can be re-closed with a small step, and the appearance is good. Further, when an adjustment layer for supplementing the cutting width of the cutter is interposed in the opening forming portion of the hollow body, a substantial step can be eliminated.

When the hollow body according to the first aspect is a resin molded article obtained by blow molding, it is difficult to form an opening in advance at the same time as the molding, but the configuration as in the first aspect is adopted. Thus, an opening can be easily formed in the hollow body after the blow molding, and processing of the inside of the hollow body and attachment of parts can be performed through the opening.

Preferably, the opening is cut by a laser cutter. Since the cutting width of the laser cutter can be reduced, the dimensional difference between the incision piece and the opening can be reduced, and the adjustment layer as described above can be eliminated or thinned.

[0010] More preferably, the angle of incidence of the laser cutter on the outer shell is 15 degrees with respect to the normal to the outer shell of the hollow body.
When the inclination angle is not less than °, not only the dimensional difference between the incision piece and the opening can be made smaller, but also the adjustment layer can be eliminated or made extremely thin.

[0011] Claims 1 to 4 mention an air spoiler for an automobile as the hollow body. Electronic devices, wire harnesses, and the like can be attached to the inside of the air spoiler through the opening, and the appearance is not impaired even after closing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows an air spoiler 3 mounted on the upper surface of a trunk lid 2 of a passenger car 1. An approximately rectangular opening 5 defined by a rib 6 is formed in the center of the upper surface 4 of the air spoiler 3. 7 is hermetically closed.

The air spoiler 3 is formed of a hollow body formed by blow molding as shown in FIG. 2, and the opening 5 has an inclined surface 12 with a peripheral edge 11 facing outward and an outer surface on the rear side thereof. The shell has mounting seats 21 and 21 and a support portion 22 which are bent and formed so as to protrude inside, and the plate-like antenna 2 disposed on the air spoiler 3.
0 is supported by the mounting seats 21 and 21 and the support portion 22 and is fixed by screws 23.

The plate antenna 20 is of a type in which, for example, a plurality of antenna elements are arranged at predetermined intervals and electrically combined to obtain desired horizontal and vertical directivities, and is suitable for satellite broadcast reception. Alternatively, there is one that includes a plurality of, for example, three antennas, and is suitable for a GPS that receives radio waves emitted from three satellites at the same time.

The lid 7 has an inclined surface 13 formed at the periphery thereof, which is complementary to the inclined surface 12, and hermetically closes the opening 5 via an adhesive layer 30.

The lid 7 according to the present embodiment is formed by cutting after forming the air spoiler 3 obtained by blow molding. FIG. 3 is a view for explaining the forming method, and the inside is cut along the rectangular rib 6 by a laser beam inclined by an angle A ° with respect to the vertical direction. The part D shows the shape before cutting, and the part E shows the shape after cutting. The width of the resin removed by the laser beam is as small as about 0.2 mm. After the installation and wiring of the wire harnesses (not shown) including the feeder are completed, they are directly welded by ultrasonic waves or high-frequency vibrations (see FIG. 4), or through an adhesive layer 30 having a laser beam width as shown in FIG. Close with lid 7.

The lid 7 is a cut piece of the air spoiler 3 cut by a laser beam. Since the laser beam is numerically controlled and the air spoiler 3 is incised at a predetermined position so as to have a predetermined shape, it is best to combine the original air spoiler 3 with another air spoiler of the same shape. It is also possible to make a lid in combination.

As described above, when the lid 7 which is an incision piece obtained by the incision is returned to the opening 5 formed by the incision and the opening 5 is closed, a gap between the opening 5 and the lid 7 is formed as shown in FIG.
As shown in (a), a step having a height H occurs. Such a step can be prevented from occurring between the periphery of the opening 5 and the lid 7 by compensating for the cutting width by a laser cutter, for example, as shown in FIGS. As shown in FIG. 4, it is important to determine the incision angle A when the adhesive layer 30 is not interposed. Assuming that the cutting width by laser cutting is 0.2 mm and the incision angle A is 45 °, the step H is 0.28 mm. FIG. 5 shows the relationship between the incision angle A and the step H. The value of the step H suddenly becomes a gentle curve from around 15 °, but the path (path) of the laser cutter.
It is preferable that the incision angle A is as small as possible (close to 0 °), and the incision angle A is 15 ° or more, preferably 3 °.
Select 0 ° to 45 °.

Of course, if the incision angle A becomes large, the step H becomes small, and the area of the inclined portion of the periphery of the opening 5 and the inclined portion of the lid 7 become large, which is preferable in terms of appearance and bonding strength. When the angle A is 90 °, the upper surface 4 of the air spoiler 3, which has a convex surface that draws a large radius, and the laser beam are substantially parallel to each other.
In the above embodiment, in the calculation using the upper surface 4 as a plane, it can be seen that when the incision angle A is 75 °, the step H is smaller than 0.21 mm and almost converges to the cut width (0.2 mm).

In the above embodiment, the rectangular rib 6 is formed, and the air spoiler 3 in which the antenna 20 is built is formed.
However, as shown in FIG. 6, the raised portion 26 is integrally formed in advance along the cutter path, and this is cut with a laser beam to accommodate the built-in components. After that, the lid 7 ′ may be returned so as to close the opening 5 ′ and welded to form a minute V-groove 27 as shown in FIG. 7. The V-groove 27 has, for example, an incision angle A
Is 30 ° and the height of the ridge Rh is 0.4 mm, the width is about 0.2 mm and the depth is about 0.15 mm. It is also possible to have a smooth surface.

In the above description, the blow-molded air spoiler has been described as an example. However, a so-called FRP air spoiler, that is, an air spoiler formed by pressing and molding upper and lower half shells of a polyester prepreg containing a glass mat and pressing the same. Can also be applied. Further, the present invention is not limited to the air spoiler, and can be used as an opening for incorporating components later in a hollow body and a closing structure thereof.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing an appearance of a trunk lid on which an air spoiler is mounted.

FIG. 2 is a cross-sectional view showing an internal structure of an air spoiler having a structure for closing an opening in a hollow body of the present invention.

FIG. 3 is an explanatory view for forming a closing structure of the present invention.

FIG. 4 is an explanatory diagram showing a limit of an incision angle at the time of incision based on the shape of a hollow body.

FIG. 5 is a diagram showing a change in a step between a lid and a periphery of an opening depending on a cutting angle when a hollow body is cut with an inclined surface.

FIG. 6 is an explanatory diagram showing a relationship between a cutting width and a size of a step when a step is provided between an opening formed by incision of a hollow body and a lid.

FIG. 7 is a partial cross-sectional view showing a closed form when the cut piece is returned to the opening of the hollow body and closed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Passenger car 2 Trunk lid 3 Air spoiler 4 Upper surface (of air spoiler) 5, 5 '(Air spoiler) opening 6 Rib 7, 7' Lid 11 Opening periphery 12 (Opening) inclined surface 13 (Lid) Inclined surface 20 Plate antenna 21 Mounting seat 22 Support portion 23 Screw 26 Raised portion 30 Adhesive layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // B29L 22:00 31:30 F term (reference) 4F208 AG07 AH17 LB01 LW02 LW23 LW25 LW40 LW43 4F211 AG07 AH17 TA03 TA08 TC04 TC10 TC13 TC14 TD01 TD20 TH19 TN43 4F213 AG07 AH17 WA07 WA15 WA54 WA63 WB01 WC01

Claims (5)

[Claims] 1. An opening is formed by incising a part of the outer shell of a hollow body so as to open with an inclined surface facing outward.
A structure for closing an opening of a hollow body, wherein a cut piece of an outer shell obtained by cutting is fitted into the opening. 2. The structure for closing an opening of a hollow body according to claim 1, wherein the hollow body is a resin molded product obtained by blow molding. 3. The closing structure for an opening of a hollow body according to claim 1, wherein the opening is formed by cutting with a laser cutter. 4. The structure for closing an opening of a hollow body according to claim 3, wherein an incident angle of the laser cutter with respect to an outer shell is 15 ° or more. 5. The closing structure for an opening of a hollow body according to claim 1, wherein the hollow body is an air spoiler for a white moving vehicle.