JPH0441216A - Mold for injection-molding parabolic antenna - Google Patents

Abstract

PURPOSE:To dispose a metallic mesh to the paraboloid of a parabolic antenna body by holding the metallic mesh by both templates, pushing the metallic mesh against the cavity surface of the movable side template by horizontal movement and forming a movable section forming a specified cavity by horizontal movement to the fixed side template side. CONSTITUTION:A brass mesh 5 is arranged droopingly between a fixed side template 3 and a movable side template 4. Both templates 3, 4 are fitted and mold-clamped, and the mesh 5 is cut by a cutter. A cavity 9 is formed by mold- clamped both templates 3, 4. The movable section 3a of the fixed side template 3 is moved horizontally to the movable side template 4 side, and the mesh 5 is pushed against the cavity surface section 4b of the movable side template 4. The movable section 3a of the fixed side template 3 is shifted horizontally to the fixed side template 3 side, and the specified cavity 9 is shaped to a mold 1. A molten glass fiber-reinforced polypropylene resin is injected and filled into the cavity 9 from a nozzle 2, a mold is opened after dwell and cooling, and the mesh 5 is arranged on the paraboloid of a parabolic antenna body.

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention relates to a mold for injection molding parabolic antennas, and more specifically, a mold for manufacturing parabolic antennas used for receiving satellite broadcasting etc. by plastic injection molding. This invention relates to a parabolic antenna injection mold.

(b) Conventional technology Conventionally, parabolic antennas used for receiving satellite broadcasting, etc., have been made by coating the surface of a plastic plate with a predetermined paraboloid surface coated with conductive paint or laminating metal foil. A plastic plate having a predetermined parabolic surface with a metal mesh embedded therein is used. Among these parabolic antennas, one in which a metal mesh is embedded in a plastic plate having a predetermined parabolic surface is preferable in consideration of durability, radio wave reflection performance, cost, and the like.

For these reasons, parabolic antennas are usually made by plastic injection molding, in which a metal mesh is embedded in a plastic plate having a predetermined paraboloid.

In that case, the mold for injection molding is as shown in Figure 9 and Figure 1.
A horizontal mold 51 as shown in FIG. 0 is known. That is, the fixed mold plate 5 is placed on the nozzle 52 side of the horizontal injection molding machine.
3, a movable template 54 is disposed next to the stationary template 53, and the movable template 54 is horizontally reciprocated.

This type of mold 51 is used in the following manner.

That is, as shown in FIG. 9, a predetermined length of metal mesh L55 is pulled out from a metal mesh supply roller 56 that is rotatably supported above the mold 51 and around which a metal mesh 55 for embedding is wound.

Then, this metal mesh 55 is disposed in a hanging manner between the stationary template 53 and the movable template 54.

Then, as shown in FIG. 10, the mold plates 53 and 54 are fitted together and clamped. At this time, the metal mesh 55 is cut by a cutter (not shown).

After the mold is clamped, a plastic molding material heated and melted by an injection molding machine is injected and filled into the cavity 57 from the nozzle 52. After that, holding pressure, cooling, opening the mold, and removing the product are performed.

(c) Problems to be Solved by the Invention When a parabolic antenna is molded using the mold 51 as described above, as shown in FIG. Cavity 5 is stuck in each corner of the surface part.
It is placed within 7. Therefore, even if the cavity surface of the movable template 54 is designed to have a predetermined paraboloid, the metal mesh 55 is embedded with a larger curvature than the predetermined paraboloid.

As a result, the shaped parabolic antenna has poor radio wave focusing properties because it does not have a predetermined radio wave reflecting surface.
There was a problem with insufficient reception performance.

(d) Means for Solving the Problems and Their Effects This invention provides a fixed side mold plate placed on the nozzle side of a horizontal injection molding machine, and a fixed side mold plate placed opposite to and beside the fixed side mold plate. A mold for parabolic antenna injection molding comprising a movable side mold plate, wherein a part of the opposing surface side of the fixed side mold plate forms a cavity surface of the fixed side mold plate and is movable horizontally. , In the mold clamping state, the metal mesh for embedding is sandwiched between both mold plates, then moved horizontally to the movable mold plate side, presses the metal mesh against the cavity surface of the movable mold plate, and then horizontally moved to the fixed mold plate side. This is a parabolic antenna injection molding mold that is provided with a movable part that can move to form a predetermined cavity.

Here, as the metal mesh, for example, brass mesh, aluminum mesh, copper mesh, etc. are used. In addition, the movement width of the movable part provided on a part of the opposing surface of the stationary template is determined as appropriate, taking into consideration the thickness of the parabolic antenna to be the product, the type of molding material, the thickness of the metal mesh, etc. It will be done.

Thus, according to this parabolic antenna injection mold, the movable part is moved to first bring the metal mesh into close contact with the cavity surface of the movable side template, and then injection molding is performed after forming a predetermined cavity. . therefore,
It becomes possible to arrange the metal mesh along a predetermined paraboloid of the parabolic anti-six body.

In addition, in the parabolic antenna injection molding mold of the present invention, the cavity formed by the fixed side mold plate and the movable side mold plate is provided with these holes on either the upper, lower, left or right sides, or both the upper and lower sides. It is preferable to provide a gap that allows the metal mesh to move when the template is in the clamped state. This makes it possible to prevent the metal mesh from being damaged or unevenly spread when the movable part is moved to bring the metal mesh into close contact with the cavity surface of the movable template.

(E) Example Hereinafter, the present invention will be described in detail based on an example shown in the drawings. Note that this invention is not limited to this.

In FIG. 1, a horizontally placed parabolic antenna injection mold l has a fixed side mold plate 3 placed on the nozzle 2 side of a horizontal injection molding machine, and a fixed side mold plate 3 opposite to this fixed side mold plate 3 on the left side. It is provided with a movable side mold plate 4 arranged laterally. This mold
Above is a brass mesh 5 which is rotatably supported and serves as a metal mesh for embedding a parabolic antenna.
A metal mesh supply roller 6 having a mesh wound thereon is provided.

As shown in FIG. 2, the brass mesh 5 wound around the metal mesh supply roller 6 has a thickness of 0.3 mm, a mesh spacing of 0.9 mm both vertically and horizontally, and a width of 60 cm. .

As shown in FIG. 3, the fixed side template 3 has a vertically long rectangular shape from the front. A movable part 3+L whose front shape is a vertically elongated rectangle is provided in the center thereof. This movable f1
3a is provided on the opposite surface side of the fixed side mold plate 3, forms the cavity surface of the fixed side mold plate 3, and is moved horizontally reciprocally along four guide rods 8 by four hydraulic pistons 7. It is considered possible. Its reciprocating width is set to 10 mm.

The movable part 3i has a vertically elliptical front shape and a major diameter of 60 mm.
．． A concave paraboloid part with a diameter of 0 cm and a short diameter of 50.0 cm is provided, and the paraboloid part is the cavity surface part 3b of the fixed side mold plate 3.
It is said that The curvature of this cavity surface portion 3b is the fourth
It is determined in consideration of the curvature of the parabolic antenna P as the final product shown in the figure.

On the other hand, a convex cavity surface portion 4b forming a paraboloid corresponding to the cavity surface portion 3b of the stationary mold plate 3 is provided on the opposing surface side of the movable mold plate 4.

Hereinafter, how to use this mold 1 will be explained.

As shown in FIG. 1, first, the fixed template 3 and the movable template 4 are separated by a predetermined distance, and the brass mesh 5 pulled out from the metal mesh supply roller 6 is suspended between the templates 3 and 4. Arrange in a shape. Then, as shown in FIG. 5, the mold plates 3 and 4 are fitted together and clamped. At this time, the brass mesh 5 is cut to a length of 100 mm by a cutter (not shown).
Cut in cm.

In the mold-clamped state, a cavity 9 is formed by both mold plates 3 and 4. Furthermore, the mold I is provided with gaps lO and lO both above and below the cavity 9 so that the brass menyu 5 can move up and down. The brass mesh S5 is placed in the cavity 9 in a state where it is caught on a part of each corner of the cavity surface portions 3b and 4b of both templates 3 and 4.

After the mold clamping operation, the movable part 3a of the fixed mold plate 3 is horizontally moved toward the movable mold plate 4 side, and the brass menyu 5 is pressed against the cavity surface part 4b of the movable mold plate 4 (see Fig. 6). . Then, the brass mesh 5 has a gap of 10.1
Due to the presence of 0, it is plastically deformed to the set curvature without being damaged.

Next, as shown in FIG. 7, the movable part 3a of the stationary template 3 is
is horizontally moved toward the fixed side template 3 side. As a result, a predetermined cavity 9 is formed in the mold l. The relationship between the mold 1 and the brass mesh 5 in this case is shown in detail in FIG.

Thereafter, glass fiber-reinforced polypropylene resin heated and melted by an injection molding machine is injected and filled into the cavity 9 from the nozzle 2. After holding pressure for 15 seconds and cooling for 30 seconds, the mold is opened and the product is taken out.

Thus, according to this parabolic antenna injection mold l, after the movable part 3a of the fixed side template 3 brings the brass mesh 5 into close contact with the cavity surface part 4b of the movable side template 4 to form a predetermined cavity. Injection molding is performed. Therefore, it becomes possible to arrange the brass mesh 5 along a predetermined paraboloid of the parabolic antenna body.

As a result, the final product parabolic antenna P made using this mold l has a predetermined radio wave reflecting surface, so it has better radio wave focusing properties and higher reception performance than conventional parabolic antennas. ing.

(f) Effects of the invention According to the parabolic antenna injection molding mold of this invention,
It becomes possible to create a parabolic antenna with good radio wave focusing and high receiving performance.

[Brief explanation of the drawing]

Figures 1 to 8 are of this invention! An example is shown. That is, Fig. 1 is an explanatory diagram of the structure of the mold before mold clamping, Fig. 2 is a perspective view of the metal mesh supply roller around which the metal mesh is wound, and Fig. 3 is a front view of the stationary template forming the mold. Figure 4 is a perspective view of a parabolic antenna made by a mold, Figure 5 is an explanatory diagram of the configuration of the mold at the initial stage of mold clamping, and Figure 6 is an explanatory diagram of the configuration of the mold at the middle stage of mold clamping. , FIG. 7 is an explanatory diagram of the configuration of the mold at the final stage of mold clamping, and FIG. 8 is an explanatory diagram of the configuration in which a part of FIG. 7 is enlarged. 9 to 11 show conventional examples. That is, FIG. 9 is an explanatory diagram of the configuration of the mold before mold clamping, FIG. 1O is an explanatory diagram of the configuration of the mold during clamping, and FIG. . l... Mold, 2... Nozzle, 3... Fixed side template, 3a... Movable part, 3b... Cavity surface part. , 4... Movable side template, 4b... Cavity surface part, 5... Brass mesh (metal mesh),
6...Metal mesh supply roller, 7...
・Hydraulic piston, 8... Guide hole, 9... Cavity, lO... Gap. Figure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 6 Figure 7 Figure 9 Figure 18 Figure 10

Claims (1)

[Claims] 1. A parabola comprising a fixed side mold plate placed on the nozzle side of a horizontal injection molding machine and a movable side mold plate placed opposite to and next to the fixed side mold plate. A mold for antenna injection molding, in which a part of the opposite surface of the fixed side mold plate forms the cavity surface of the fixed side mold plate and can be moved back and forth in the horizontal direction. After the metal mesh is sandwiched between both templates, it is moved horizontally to the movable template to press the metal mesh against the cavity surface of the movable template, and then horizontally moved to the fixed template to form a predetermined cavity. A mold for parabolic antenna injection molding that is equipped with a flexible movable part. 2. When the mold plates are in a clamped state, the metal mesh can be moved either vertically, horizontally, vertically, or both vertically or horizontally of the cavity formed by the fixed mold plate and the movable mold plate. The parabolic antenna injection mold according to claim 1, wherein a gap is provided.