JP2020062810A - Resin panel manufacturing method - Google Patents

Abstract

To provide a method for manufacturing a resin panel that can increase a degree of freedom in resin selection.SOLUTION: A manufacturing method for a resin panel 1 includes an arranging step in which, by driving means 10 which displaces a position of a plate 3 in a molten resin filled in a cavity 7, the plate 3 is released from a mold 6 and moved from an initial position where the plate 3 is brought into contact with the mold 6, along the thickness direction of the plate 3, to a final position on a center side of the cavity 7, and the plate 3 is arranged at the final position. Then, a permanent magnet 20 is arranged in the mold 6, and in the arranging step, the plate 3 comes into contact with the driving means 10 by an attraction force generated between the plate 3 and the permanent magnet 20, and moves to the final position. A contact between the plate 3 and the driving means 10 is released due to a decrease in the attraction force as a distance between the permanent magnet 20 and the plate 3 increases. Accordingly, in the manufacturing method for the resin panel, the permanent magnet 20 having a high usage limit temperature value can be used instead of the electromagnet having a low usage limit temperature value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for manufacturing a resin panel.

  Conventionally, in a cavity defined by a mold, a plate having a plurality of holes penetrating in the thickness direction is arranged, and as a method for producing a resin panel formed by filling molten resin into the cavity, The plate is moved in the molten resin filled in the cavity from the initial position where it comes into contact with the mold by the driving means, and is moved away from the mold to the final position on the center side of the cavity along the thickness direction of the plate. There is known a method of manufacturing a resin panel, which has an arranging step of arranging a plate at a final position (for example, refer to Patent Document 1).

  In such a resin panel manufacturing method, by moving the plate in the molten resin, the molten resin passes through the holes, and even if the gap between the mold and the plate is set narrow, the gap is efficiently Can deliver molten resin to.

  However, in Patent Document 1, since the driving means itself has an electromagnet and the electromagnet having a low usable limit temperature value is exposed to the molten resin, it is necessary to select a resin having a low melting point, and the selection range of the resin is There was a limited problem. There is also a problem that the number of wirings for controlling energization / de-energization of the electromagnet is increased, which complicates the manufacturing apparatus.

Japanese Patent No. 6330116

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of manufacturing a resin panel that can increase the degree of freedom in resin selection.

According to the present invention, the resin panel is formed by arranging a plate having a plurality of holes penetrating in the thickness direction in a cavity defined by a mold and filling the cavity with a molten resin. There is.
Then, in the method of manufacturing the resin panel, the cavity is separated along the thickness direction of the plate from the initial position where the plate is contacted with the mold by the driving means for displacing the position of the plate in the molten resin filled in the cavity. There is an arranging step of moving the plate to the final position on the center side and arranging the plate at the final position.

  Then, the permanent magnet is arranged in the mold, and in the arrangement step, the plate moves to the final position in contact with the driving means by the attractive force generated between the plate and the permanent magnet, and at the final position, the permanent magnet and the plate move. The contact between the plate and the driving means is released due to the decrease in the suction force with the increase in the separation distance therebetween.

As a result, in the resin panel manufacturing method of the present invention, a permanent magnet having a high usage limit temperature value can be used instead of an electromagnet having a low usage limit temperature value.
Therefore, a resin having a high melting point can be used, and the degree of freedom in resin selection can be increased.

It is a perspective view of a resin panel and a plate (example). It is sectional drawing of the manufacturing apparatus of a resin panel (example). It is an explanatory view of an arrangement process (example). It is an explanatory view of an arrangement process (example). It is an explanatory view of a molding process (example). It is explanatory drawing of the movable mechanism of a permanent magnet (modification).

  Hereinafter, modes for carrying out the invention will be described based on examples.

A resin panel 1 according to an embodiment of the present invention is shown in FIG.
The resin panel 1 is a so-called insert molded body in which a plate 3 having a plurality of holes 2 penetrating in the thickness direction is embedded.
The entire surface of the plate 3 is embedded in the resin material.

Here, the plate 3 is, for example, a magnetic steel plate in which the hexagonally formed holes 2 are arranged in a honeycomb shape.
The shape and arrangement of the holes 2 are not limited to this configuration, and the material of the plate 3 is not limited.
Further, the thickness of the plate 3 (0.05 to 3.0 mm) and the thickness of the resin panel 1 (3 to 20 mm) are not limited to this thickness.

Here, the resin panel 1 is manufactured by the manufacturing apparatus 5 shown in FIG.
The manufacturing apparatus 5 is basically the same as the manufacturing apparatus of Patent Document 1.
The manufacturing apparatus 5 includes, for example, an upper die 6a and a lower die 6b as the die 6. The mold 7 divides the cavity 7, and the outer shape of the resin panel 1 is determined based on the shape of the inner surface of the mold 6.
A molten resin injection gate 8 is provided on the left side of the lower mold 6b in the figure, and an extrusion pin 9 for taking out the resin panel 1 after the molding is completed is provided on the lower side of the figure.

Here, a pair of insertion holes 11 through which the support rod 10 having a predetermined outer diameter is inserted are provided in the ceiling portion of the upper mold 6a. The support rod 10 is slidable in the insertion hole 11 in the axial direction.
A piston 16 that reciprocates in the cylinder 15 is integrally connected to the upper end of the support rod 10 in the figure.

The piston 16 and the support rod 10 constitute a driving means for displacing the position of the plate 3. The piston 16 is constantly urged upward in the drawing by a compression coil spring 17 in the cylinder 15.
Then, when the hydraulic pressure from the hydraulic pressure supply device (not shown) is applied to the lower side of the drawing with respect to the piston 16, the piston 16 moves to the lower side of the drawing against the biasing force of the compression coil spring 17, and the application of the hydraulic pressure is released. When it is moved, it moves upward in the drawing by the biasing force of the compression coil 17.

That is, the piston 16 reciprocates in the cylinder 17 depending on the magnitude of the applied hydraulic pressure, and accordingly, the support rod 10 also reciprocates in the insertion hole 11.
The hydraulic pressure applied to the piston 16 is controlled by a control device (not shown).

Further, an annular permanent magnet 20 arranged so as to surround the support rod 10 is embedded in the ceiling portion of the upper mold 6a.
The upper die 6a and the support rod 10 are both nonmagnetic materials.

Here, the placement process will be described with reference to FIGS.
First, as shown in FIG. 3, before the cavity 7 is filled with the molten resin, the plate 3 is sucked by the permanent stone 20 and placed at the initial position in contact with the upper mold 6a.
Then, in this state, the cavity 7 is filled with the molten resin.

Next, as shown in FIG. 4, when the cavity 7 is filled with the molten resin, the hydraulic pressure is applied to the piston 16 of the driving means, and the piston 16 moves downward in the drawing, so that the support rod 10 also Move down in the figure. At this time, the plate 3 moves to the lower side in the drawing together with the support rod 10 while being in contact with the support rod 10 of the driving means by the attractive force of the permanent magnet 20.
That is, the plate 3 is moved away from the upper mold 6a toward the center of the cavity 7 along the thickness direction.

At this time, a flow of the molten resin passing through the hole 2 occurs as the plate 3 moves downward in the drawing.
Thereby, the molten resin can be efficiently delivered to the upper side of the plate 3 in the drawing.
Then, the plate 3 moves to the final position and stops.

At this time, contact between the plate 3 and the supporting rod 10 of the driving means is released due to the decrease in the attractive force as the distance between the permanent magnet 20 and the plate 3 increases.
In addition, the white arrow in the figure represents the moving direction of the piston 16 and the like, and the arrow in the figure represents the flow of the molten resin.

Thereafter, as shown in FIG. 5, the application of the hydraulic pressure to the piston 16 is released, so that the piston 16 and the support rod 10 move to the upper side in the drawing.
At this time, since the contact between the plate 3 and the supporting rod 10 of the driving means is released, the plate 3 remains in the final position.
The support rod 10 stops at a position where the lower end surface in the drawing is flush with the inner peripheral surface of the ceiling of the upper mold 6a.
Then, after a lapse of a predetermined time, the mold 6 is opened, and the resin panel 1 is removed from the mold 6 by the push pin 9 (see FIG. 2).
In addition, the white arrow in the drawing represents the moving direction of the piston 16 and the like.

[Effect of Example]
In the method for manufacturing the resin panel 1 of the embodiment, the plate 3 is separated from the upper mold 6a from the initial position in which the plate 3 is in contact with the upper mold 6a by the driving means that displaces the position of the plate 3 in the molten resin filled in the cavity 7. There is an arrangement step of moving the plate 3 to the final position on the center side of the cavity 7 along the thickness direction and arranging the plate 3 at the final position.

  Then, the permanent magnet 20 is arranged on the upper die 6a, and in the arrangement step, the plate 3 comes into contact with the support rod 10 by the attraction force generated between the plate 3 and the permanent magnet 20 to move to the final position. Then, the contact between the plate 3 and the support rod 10 is released due to the decrease in the attractive force as the distance between the permanent magnet 20 and the plate 3 increases.

Thus, in the method for manufacturing the resin panel 1, the permanent magnet 20 having a high usage limit temperature value can be used instead of the electromagnet having a low usage limit temperature value.
Therefore, a resin having a high melting point can be used, and the degree of freedom in resin selection can be increased.
Further, since it is only necessary to embed the permanent magnet 20 in the upper die 6a, there is no need to arrange the wiring unlike the electromagnet, and the upper die 6a has a simple structure.
The permanent magnet 20 has an installation position determined according to the type, strength, and final position of the permanent magnet 20.

[Modification]
Various modifications of the present invention can be considered without departing from the scope of the invention.
In the embodiment, the permanent magnet 20 is embedded and fixed in the upper mold 6a, but it may be movable in the vertical direction in the drawing as shown in FIG.

More specifically, an insertion hole 22 through which the magnet support rod 21 having a predetermined outer diameter is inserted is provided in the ceiling portion of the upper mold 6a. The magnet support rod 21 is slidable in the insertion hole 22 in the axial direction.
The permanent magnet 20 held in the hollow space formed in the ceiling is integrally connected to the lower end of the magnet supporting rod 21 in the figure, and the upper end of the magnet supporting rod 21 in the figure reciprocates in the cylinder 25. The pistons 26 are integrally connected.

The cylinder 25, the piston 26, and the magnet supporting rod 21 constitute a driving unit that displaces the position of the permanent magnet 20. The piston 26 is constantly urged upward in the drawing by a compression coil spring 27 in the cylinder 25.
Then, when the hydraulic pressure from the hydraulic pressure supply device (not shown) is applied to the lower side of the drawing with respect to the piston 26, the piston 26 moves to the lower side of the drawing against the biasing force of the compression coil spring 27, and the application of the hydraulic pressure is released. When it is broken, it is moved upward in the drawing by the urging force of the compression coil spring 27.

That is, the piston 26 reciprocates in the cylinder 27 depending on the magnitude of the applied hydraulic pressure, and accordingly, the magnet support rod 21 also reciprocates in the insertion hole 22 and the permanent magnet 20 reciprocates in the hollow space. There is.
As a result, the contact between the plate 3 and the support rod 10 can be released more reliably by moving the permanent magnet 20 upward in the drawing at the final position.
Further, the position of the permanent magnet 20 in the hollow space can be finely adjusted with respect to the change in the strength of the magnetic force of the permanent magnet 20 over time.

In the embodiment, the plate 3 is not arranged on the lower side of the drawing, but the plate may be arranged on the lower side of the drawing.
In addition, when a plurality of plates are arranged, the strength of the resin panel 1 can be further increased.

Further, in the embodiment, the manufacturing apparatus 5 does not have the driving means in the lower die 6b, but the lower die 6b may have the driving means like the upper die 6a.
Further, in the embodiment, the plate 3 is moved from the initial position to the final position once in the arranging step, but it may be moved plural times, and the plate 3 may be reciprocated.

1 Resin Panel 2 Hole 3 Plate 6 Type 7 Cavity
10 Driving means (support rod) 20 Permanent magnet

Claims (1)

By arranging a plate (3) in which a plurality of holes (2) penetrating in the thickness direction are formed in a cavity (7) defined by a mold (6) and filling the cavity with a molten resin. A method of manufacturing a resin panel (1) to be formed, comprising:
From an initial position where the plate is brought into contact with the mold by a driving means (10) for displacing the position of the plate in the molten resin filled in the cavity, the cavity is separated from the mold along the thickness direction. In a method of manufacturing a resin panel having an arranging step of moving the plate to the final position on the center side and arranging the plate at the final position,
A permanent magnet (20) is arranged in the mold,
In the arranging step, the plate moves to the final position in contact with the driving means by an attractive force generated between the plate and the permanent magnet, and at the final position, the separation distance between the permanent magnet and the plate is increased. A method of manufacturing a resin panel, characterized in that the contact between the plate and the driving means is released due to a decrease in the suction force with an increase.

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