JP2012200926A - Molded article for plastic housing, injection molding machine, and injection molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molded article for a plastic housing, an injection molding machine and an injection molding method, capable of securing strength advantageously in cost by setting a metal-coated glass fiber compulsorily in an ideal direction by a magnetic field.SOLUTION: The molded article 10 for the plastic housing includes the glass fiber. The glass fiber is coated with a magnetizable metal by vapor deposition.

Description

  The present invention relates to a portable communication terminal device such as a mobile phone, PHS (Personal Handy-phone System), a portable information processing device such as a PDA or a notebook personal computer, or a mobile device such as a portable music player, portable game machine, or digital camera. The present invention relates to an injection molding machine and an injection molding method for molding a plastic casing molded article by injecting a plastic casing molded article and a resin into a mold.

  As a conventional plastic casing molded product, injection molding machine, and injection molding method, a spiral groove is provided on the outer peripheral surface of a shaft-shaped mold for molding a rotating shaft through-hole portion of an impeller, and fibers around the mold By rotating the flow of the plastic material with a spiral groove, the fiber direction of the rotation shaft through hole portion of the impeller is known to be oriented along the circumferential direction with respect to the shaft center (for example, patent document) 1).

  According to the technique described in Patent Document 1, the fiber direction in the through hole is the same as the stress generated around the through hole in the center, and the fiber orientation is resistant to the stress direction. The strength is increased.

By the way, conventionally, as shown in FIG. 5, an injection molding machine 100 for injection molding a molded product for a plastic casing containing glass fibers has been proposed.
In such an injection molding machine 100, a resin R100 as a molding material is filled in a cavity 103 formed between one mold 101 and the other mold 102.
The resin R100 filled in the cavity 103 is filled in a direction away from a gate (not shown).

At this time, as shown in FIG. 6, in the resin R <b> 100, the glass fiber orientation A <b> 100 is arranged in a direction perpendicular to the convex portion 104 formed on the other mold 102.
As described above, the orientation of the glass fiber is determined along the flow of the resin R100 during molding by the injection molding machine 100 during manufacturing.
In particular, since many plastic casing molded products applied to the casing of a mobile device such as a mobile phone have complicated shapes, the flow of the resin R100 is also complicated.
Therefore, after the resin R100 is cured, the bent portion 105 portion formed by the convex portion 104 of the other mold 102 is easily broken.
Therefore, the molded product for plastic casings that has been molded in this way is subject to large strength degradation partially depending on the shape of the part, and when dropped or loaded, it can be easily damaged from that part. There is.

  On the other hand, the technique described in Patent Document 1 is proposed in order to solve the above problem, and the fiber direction of the rotation shaft through hole portion of the impeller is oriented so as to be along the circumferential direction with respect to the axis. did.

Japanese Patent Laid-Open No. 64-015497

However, the technique described in Patent Document 1 has the following two problems.
The first point is that it is necessary to provide a spiral groove on the outer peripheral surface of the shaft-shaped mold for forming the rotation shaft through hole portion of the impeller, and the spiral groove has a complicated shape, which is disadvantageous in terms of cost. It is to be.
Secondly, since the flow of the fiber plastic material around the mold must be swirled by a spiral groove, the molding machine may be complicated and large.

  The present invention has been made in order to solve the above-mentioned problems, and in terms of cost, it is advantageous to ensure the strength by forcibly setting the glass fiber coated with metal in an ideal direction by a magnetic field. An object of the present invention is to provide a plastic casing molded article, an injection molding machine, and an injection molding method.

In order to solve the above problems, the present invention proposes the following means.
That is, the molded article for a plastic casing according to the present invention is a molded article for a plastic casing containing glass fiber, and the glass fiber is coated with a metal to be magnetized by changing the orientation. It is characterized by that.

  Further, the injection molding machine according to the present invention is a magnetic field generator for locally applying a magnetic field to a mold and a resin filled in the mold containing glass fibers coated with a magnetized metal. And a machine.

  Furthermore, the injection molding method according to the present invention includes a step of locally applying a magnetic field to a resin containing glass fibers coated with a magnetized metal and filled in a mold. .

  According to the molded article for plastic casing and the injection molding machine and the injection molding method according to the present invention, advantageously, the glass fiber coated with metal is forcibly set in an ideal direction by a magnetic field, There exists an effect that intensity can be secured.

It is sectional drawing of the injection molding machine of one Embodiment which concerns on this invention. It is sectional drawing at the time of injection of the injection molding machine explaining the injection molding method of one embodiment concerning the present invention. It is a partially broken sectional view of the injection molded product of one embodiment concerning the present invention. It is sectional drawing of the conventional injection molding machine. It is sectional drawing at the time of injection of the conventional injection molding machine. It is sectional drawing at the time of injection of the conventional injection molding machine.

Hereinafter, an injection molding machine and an injection molding method according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, an injection molding machine 10 according to an embodiment of the present invention includes a mold 11 including a first mold 12 and a second mold 13, a controller 14, a magnetic field generator 15, It has.
The first mold 12 has a concave surface 16, and a gate 17 is connected to the concave surface 16.
A cavity 18 is formed between the second mold 13 and the concave surface 16 of the first mold 12. The second mold 13 has a convex surface 19 that faces the concave surface 16.
Moreover, the 2nd metal mold | die 13 has the convex part 20 for forming the bending part 2 in the molded article for plastic housings (refer FIG. 4) 1 shape | molded by the convex surface 19. FIG.

  The controller 14 controls the driving of the first mold 12 and the second mold 13 and controls the magnetic field generator 15 to be driven at a predetermined timing.

  The magnetic generator 15 is magnetically connected to the first mold 12 and the second mold 13, and is magnetically driven in a set predetermined direction at a predetermined position in the cavity 18 by driving. 2) H is generated.

  Resin R is filled into the cavity 18. The resin R contains glass fiber, and the glass M is coated by vapor deposition with a metal M that is magnetized by changing its orientation.

Next, an injection molding method executed by the injection molding machine 10 will be described.
As shown in FIG. 2, when the first mold 12 and the second mold 13 are closed by a command signal from the controller 14, the resin R stored in a storage unit (not shown) is transferred from the gate 17 to the cavity. 18 is filled.
At this time, the gate 17 is disposed at a position away from the convex portion 20 of the second mold 13 in the first mold 12.
The resin R filled in the cavity 18 advances in a direction away from the gate 17.
Therefore, the resin R is arranged along the direction in which the glass fiber coated with the metal M flows.
Therefore, since the magnetic generator 15 is driven by the controller 14, a magnetic field H is generated in the cavity 18 toward both side portions A and B of the convex portion 20 of the second mold 13.

As shown in FIG. 3, since the magnetic field H is generated by the magnetic generator 15 toward both side portions A and B of the convex portion 20 of the second mold 13 in the cavity 18, it is coated on the glass fiber of the resin R. The orientation of the metal M is changed in the direction of the magnetic force accompanying the magnetic field H.
Therefore, when the metal M coated on the glass fiber of the resin R is changed to an orientation that does not intersect the convex portion 20 of the second mold 13 at an acute angle, the glass fiber is also changed to the same orientation as the metal M. Is done.
Note that the magnetic field H generated by the magnetic generator 15 is not limited to the side portions A and B of the convex portion 20 of the second mold 13 in the cavity 18 and can be set as appropriate according to the shape of the molded product.

As shown in FIG. 4, the first mold 12 and the second mold 13 are subsequently opened in synchronization with the curing of the resin R, and the molded article 1 for the plastic housing is taken out.
The molded product 1 for a plastic housing has a first plate portion 3 and a second plate portion 4 orthogonal to the first plate portion 3, and a bent portion between the first plate portion 3 and the second plate portion 4. 2 is formed.
At this time, in the bent portion 2, the metal M coated on the glass fiber of the resin R is changed to an orientation that does not intersect an acute angle.
Therefore, the strength can be ensured by forcibly changing the glass fiber coated with the metal M to an orientation that does not intersect the convex portion 20 of the second mold 13 at an acute angle by the magnetic field H.

As described above, according to the molded article 1 for plastic casing of one embodiment, the metal M that is magnetized by changing the orientation is coated on the glass fiber by vapor deposition.
Therefore, according to the molded article 1 for a plastic housing, the glass fiber coated with the metal M is changed to an orientation that does not intersect the bent portion 2 at an acute angle around the bent portion 2 by the magnetic field H. The strength can be advantageously ensured.

Moreover, according to the injection molding machine 10 of one embodiment, the glass fiber coated with the metal M is oriented by the magnetic field H so as not to intersect the convex portion 20 at an acute angle around the convex portion 20 of the second mold 13. Be changed.
Therefore, according to the injection molding machine 10, it is possible to acquire the molded article 1 for a plastic casing having a sufficient strength, advantageously in terms of cost.

And according to the injection molding method of one embodiment, the glass fiber coated with the metal M is changed to an orientation that does not intersect the convex portion 20 at an acute angle around the convex portion 20 of the second mold 13 by the magnetic field H. Is done.
Therefore, according to the injection molding method, it is possible to mold the molded article 1 for the plastic casing having a sufficient strength, advantageously in terms of cost.

  The plastic casing molded article, injection molding machine, and injection molding method of the present invention are not limited to the above-described embodiments, and appropriate modifications and improvements can be made.

For example, as a reinforcing agent for the resin material, not a glass fiber but a fiber made of a magnetizable metal can be used.
By doing so, the strength is higher than that of the glass fiber, and processing such as vapor deposition is not required.

As described above, according to the molded article for plastic casing, the injection molding machine, and the injection molding method of the present invention, the glass fiber coated with metal is forcibly forced to be in an ideal direction by a magnetic field. By setting, strength can be ensured.
As a result of the above, it is possible to provide a molded article for a plastic casing that is hard to break, and the industrial applicability of the present invention can be said to be great.
There is an effect.

1 Molded product for plastic casing 10 Injection molding machine 11 Mold 12 First mold (mold)
13 Second mold (mold)
15 Magnetic field generator

Claims (3)

A molded product for a plastic casing containing glass fiber,
A molded article for a plastic casing, wherein the glass fiber is coated by vapor deposition with a metal whose orientation is changed and set. Mold,
A magnetic field generator capable of locally applying a magnetic field to the resin filled in the mold containing glass fibers coated with a magnetized metal;
An injection molding machine comprising:   An injection molding method comprising a step of locally applying a magnetic field to a resin containing glass fibers coated with a metal to be magnetized and filled in a mold.

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