JP2010000718A - Insert-molded component and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert-molded component which does not take much trouble in surface fabrication and enables uniform coating of the surface without cracking when the coating work is performed and enhancing of the strength. <P>SOLUTION: First, insert-molding is performed so as to enable covering of the entire surface and outer circumferential surface entirety of a metallic plate 1 with a resin sheet 2. Then a collar part 6 is formed of a resin in such a way that the resin finds its way around to the back surface of the metallic plate 1 from a plurality of holes for fixing 4 opened in the metallic plate 1. Further, each resin ejection hole 10 provided on the metallic plate 1 is tapered into such a shape so that the diameter of the face side is smaller than the diameter on the back side, and even each resin injection hole 5 of the tapered shape is filled with the resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an insert molded part formed by applying a resin mold to a metal plate.

In the case of an electronic device casing or the like, the electronic component mounted on an internal substrate or the like is protected from external static electricity, or the electromagnetic component transmitted from the electronic component is prevented from leaking to the outside. It is necessary to provide a shielding function to a housing or the like that houses a mounted substrate or the like, and it is necessary to ensure a necessary strength for the housing or the like.
Therefore, a molded part formed by applying a resin mold to a metal plate is used for the casing of such an electronic device.

9 is a front view of a conventional molded part, FIG. 10 is a sectional view taken along the line DD of FIG. 9, and FIGS. 11 and 12 are partial sectional views of FIG.
As shown in FIGS. 9 and 10, in the conventional insert molded part, the resin portion 22 is molded by molding so as to form a frame shape on the outer peripheral edge portion of the metal plate 21 made of magnesium or the like for electromagnetic wave shielding.

The frame-shaped resin portion 22 is formed with a notch portion 23 for attaching a hinge (hinge) or the like and an attachment hole (not shown) for attaching an accessory such as a switch, or for forming a casing together with other molded components. A screw hole (not shown) through which the fixing screw is passed is formed at the time of molding.
Further, as shown in FIG. 11, a plurality of recesses 24 are provided on both the front and back surfaces of the outer peripheral edge of the metal plate 21, and the resin portions 22 are filled in the recesses 24, or the metal plate as shown in FIG. The stepped portion 25 is formed on one surface of the outer peripheral edge portion 21 and is formed so that the resin portion 22 wraps around the stepped portion 25, thereby increasing the mounting strength of the metal plate 21 and the resin portion 22 (for example, Patent Document 1).
JP 2000-114742 A

However, in the above-described conventional technology, since the resin is molded so as to form a frame shape on the outer peripheral edge portion of the metal plate, for example, the surface of the metal plate is subjected to embossing to improve the appearance. When performing, since it has to process for every metal plate of each molded part after resin molding, there exists a problem that a surface processing takes time and effort.
In addition, for example, when painting the entire surface of an insert molded part, it is difficult to paint uniformly because there is a difference in the material of the metal plate and the resin, resulting in uneven coating at the boundary between the metal plate and the resin. In addition to damage, there is also a problem that cracks (cracks) occur in the uneven paint portion.

Furthermore, in order to increase the attachment strength between the metal plate and the resin, the metal plate needs to have a thickness that enables the formation of these recesses and steps, because the recesses and steps into which the resin enters the metal plate are formed. There is also a problem that the overall weight increases due to the use of a thick metal plate.
An object of the present invention is to solve these problems.

Therefore, the insert-molded part of the present invention is insert-molded so that the resin plate covers the entire surface and the entire outer peripheral surface of the metal plate, and the metal plate is provided with a plurality of fixing holes when molding the resin plate. A flange that is larger than the fixing hole is formed by a resin that wraps around from the fixing hole to the back side of the metal plate.
Further, the present invention provides the insert molded part, wherein the metal plate is provided with a plurality of resin injection holes having a taper shape whose diameter on the front surface side is smaller than the diameter on the back surface side, and the resin injection is performed when the resin plate is molded. The structure is characterized in that the resin filled in the hole is prevented from coming off.

  In the present invention as described above, the metal plate is insert-molded so that the resin plate covers the entire surface and the entire outer peripheral surface of the metal plate. In the case of performing the process, the embossing function can be provided to the mold so that the embossing process can be performed simultaneously with the insert molding, so that the effect of eliminating the trouble of the surface processing can be obtained.

Even if the entire surface of the insert-molded part is coated after insert molding instead of embossing, for example, the coating is performed only on the resin plate covering the entire surface of the metal plate and the entire outer peripheral surface. This also makes it possible to eliminate the occurrence of coating unevenness and cracks.
In addition, a flange is formed of resin so as to go around the back surface of the metal plate from a plurality of fixing holes provided in the metal plate, and the shape of each resin injection hole provided in the metal plate is the diameter on the front surface side As the taper shape is smaller than the diameter, the taper-shaped resin injection holes are filled so as to secure the fixing strength and adhesion strength between the metal plate and the resin plate. There is no need to use it, so that it is possible to improve the strength without increasing the weight.

  Embodiments of an insert molded part and a method for manufacturing the same according to the present invention will be described below with reference to the drawings.

1 is a front view (front view) showing the embodiment, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a rear view (rear view) of the embodiment, and FIG. 5 is a cross-sectional view taken along the line CC of FIG. 3, and FIG. 6 is a front view of a metal plate used in the embodiment.
As shown in FIGS. 1 and 2, the insert-molded part of the present embodiment has the entire front surface (front surface) and the entire outer peripheral surface of the resin plate 2 except for the rear surface (back surface) of the metal plate 1 made of magnesium or the like for electromagnetic wave shielding. The resin plate 2 is insert-molded so as to cover, and a notch 3 for attaching a hinge (hinge) or the like to a predetermined portion of the peripheral portion of the resin plate 2 or a mounting hole (not shown) for attaching an accessory such as a switch, or A screw hole (not shown) through which a fixing screw for forming a casing is formed together with other molded parts is formed by a molding die.

  As shown in FIG. 6, for example, a rectangular fixing hole 4 for securing the fixing strength between the metal plate 1 and the resin plate 2 and a resin for injecting resin when the resin plate 2 is insert-molded into the metal plate 1. A plurality of injection holes 5 are provided, and the resin filled in each fixing hole 4 forms a flange 6 larger than the fixing hole 4 on the back surface side of the metal plate 1 as shown in FIG. As a result, the resin plate 2 is attached so as not to be in close contact with the metal plate 1 and peeled off, and the fixing strength between the metal plate 1 and the resin plate 2 is secured.

Further, as shown in FIG. 5, each resin injection hole 5 is provided so that the diameter on the front surface side of the metal plate 1 is smaller than the diameter on the back surface side, and is filled in each resin injection hole 5. The resin is secured by taper so that the resin plate 2 is firmly attached to the metal plate 1 so as not to peel off.
Next, the manufacturing method of a present Example is demonstrated.

FIG. 7 is a side sectional view showing a method of manufacturing an insert-molded part according to the present embodiment, and FIG. 8 is an enlarged view of a part a in FIG.
In FIG. 7, 7 is a fixed mold for insert molding, 8 is a movable mold, and the fixed mold 7 is formed with at least one suction hole 9, a plurality of resin injection holes 10 and a flange 6. A recess (not shown) is provided at a position overlapping each fixing hole 4 of the metal plate 1, and a molding recess 11 is formed in the movable mold 8.

The tip of the suction hole 9 of the fixed mold 7 is opened at the surface facing the movable mold 8 and is provided at a position that does not overlap the fixing hole 4 and the resin injection hole 5 of the metal plate 1. The rear end of 9 is connected to an air suction device (not shown).
Further, the tip of each resin injection hole 10 is provided so as to overlap with each resin injection hole 5 of the metal plate 1 as shown in FIG. 8, and a tapered resin injection hole is provided around each resin injection hole 10. 5 has a convex portion 10a that fits about half the depth from the larger diameter side, and the rear end of each resin injection hole 10 is connected to a single resin injection molding machine (not shown). .

On the other hand, the recess 11 for insert molding of the movable mold 8 is formed with a notch 3 or a mounting hole (not shown) for attaching the notch 3 or an accessory to the resin plate 2 or a screw hole (not shown) through which a fixing screw is passed. The depth and shape are set as described above, and when the surface of the resin plate 2 is subjected to the embossing process, an embossing pattern is applied to the surface of the recess 11 facing the fixed mold 7.
The movable mold 8 is moved in the directions of arrows E and F by a moving mechanism (not shown), and can be pressed against and separated from the fixed mold 7.

When manufacturing an insert-molded part, first, the movable mold 8 is moved in the direction of arrow F by a moving mechanism (not shown) to be separated from the fixed mold 7, and the fixed mold 7 is moved to the movable mold 8. The metal plate 1 is adsorbed on the opposing surface through the suction hole 9 by an air suction device.
An adhesive that is melted by the heat of the resin is applied in advance to the surface of the metal plate 1, and when the metal plate 1 is adsorbed through the suction holes 9, the resin injection holes 5 of the metal plate 1 are fixed to the fixed side metal. The metal plate 1 is positioned by being fitted to the convex portion 10a of the mold 7 and is held so as to prevent the positional deviation and the wrapping of the resin to the back surface side.

Thereafter, the movable die 8 is moved in the direction of arrow E by a moving mechanism (not shown), and is brought into contact with and pressed against the fixed die 7.
In this state, when resin is injected by a resin injection device (not shown) connected to the rear end of each resin injection hole 10 of the fixed side mold 7, the resin is transferred from each resin injection hole 5 of the metal plate 1 to the movable side mold. 8, the resin plate 2 is formed so as to cover the entire front surface (surface) and the entire outer peripheral surface of the metal plate 1, and a part of the resin is fixed to each fixing hole of the metal plate 4. 4, the flange 6 is formed around the not-shown concave portion of the fixed mold 7 and the resin is filled in the taper-shaped resin injection holes 5 by about half.

As a result, the metal plate 1 and the resin plate 2 become an insert-molded part having an integral structure, and the resin plate 2 is attached to the metal plate 1 so as not to come into close contact with the adhesive, and is attached to the flange 6 and the fixing hole 4. The fixed strength of the metal plate 1 and the resin plate 2 is ensured by the filled tapered resin.
Thereafter, the movable mold 8 is moved in the direction of arrow F by a moving mechanism (not shown) to be separated from the fixed mold 7, and the molded part is separated from the fixed mold 7 by a separating mechanism (not shown).

According to the embodiment described above, insert molding is performed so that the entire surface and outer peripheral surface of the metal plate 1 are covered with the resin plate 2, and the plurality of fixing holes 4 provided in the metal plate 1 are formed on the back surface of the metal plate 1. The flange portion 6 is formed of resin so as to go around, and the shape of each resin injection hole 10 provided in the metal plate 1 is tapered so that the diameter on the front surface side is smaller than the diameter on the back surface side. 5 is filled, so that the following effects can be obtained. That is, since the resin plate 2 covers the entire surface and the entire outer peripheral surface of the metal plate 1, for example, appearance If you want to improve the surface of the metal plate for the purpose of improvement, by giving the mold the function of surface processing, you can perform the surface processing at the same time as insert molding, so that the surface processing will not take time and effort. Effect Fruit is obtained.

In addition, even when, for example, the entire surface of the insert-molded part is coated after insert molding instead of embossing, the coating is performed only on the resin plate 2 covering the entire surface of the metal plate 1 and the entire outer peripheral surface. In addition, it is easy to paint, and it is possible to eliminate the occurrence of uneven coating and cracks.
In addition, a jishiniori collar portion 6 is formed so as to wrap around the back surface of the metal plate 1 from a plurality of fixing holes 4 provided in the metal plate 1, and the shape of each resin injection hole 10 provided in the metal plate 1 is changed to the surface side. Since the taper shape is smaller than the diameter on the back surface side, the taper-shaped resin injection holes 5 are also filled to secure the fixing strength and adhesion strength between the metal plate 1 and the resin plate 2. It is not necessary to use a thick metal plate, so that it is possible to improve the strength without increasing the weight, and in applications such as notebook PC exterior covers and housings. It became possible to use it as an insert-molded part with a sufficient shield.

  In the above-described embodiment, three fixing holes 4 are provided along the left and right changes of the metal plate as shown in FIG. 6, but the position and number are not limited to this, and the resin is not limited to this. In the embodiment described above, five injection holes 5 are also provided in the center in an X-shaped arrangement as shown in FIG. 6, but the position and number are not limited to this.

Front view showing an example AA line cross section of FIG. Rear view of the example BB line cross section of FIG. CC cross section of FIG. Front view of metal plate used in examples Side sectional view which shows the manufacturing method of the molded component by Example Enlarged view of part a in FIG. Front view of conventional molded parts DD sectional view of FIG. 9 is a partial cross-sectional view of FIG. 9 is a partial cross-sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal plate 2 Resin plate 3 Notch part 4 Fixing hole 5 Resin injection hole 6 Gutter part 7 Fixed side metal mold 8 Movable side metal mold 9 Suction hole 10 Resin injection hole 11 Recessed part

Claims (4)

Insert molding so that the resin plate covers the entire surface of the metal plate and the entire outer peripheral surface,
The metal plate is provided with a plurality of fixing holes, and a flange that is larger than the fixing hole is formed by a resin that wraps around from the fixing holes to the back side of the metal plate when the resin plate is molded. Insert molded parts characterized by. The insert molded component according to claim 1, wherein the metal plate is provided with a plurality of resin injection holes having a taper shape whose diameter on the front surface side is smaller than the diameter on the back surface side, and the resin injection holes are formed at the time of molding the resin plate. An insert molded part characterized by having a structure for preventing the resin to be filled from coming off. Adsorbing a metal plate provided with a plurality of resin injection holes and a plurality of fixing holes having a taper shape whose diameter on the front surface side is smaller than that on the back surface side to the fixed mold, and the surface facing the fixed mold The movable side mold in which a recess is formed is butt against the fixed side mold,
Insert resin so that the resin plate covers the entire surface and the entire outer peripheral surface of the metal plate by injecting resin from the resin injection hole provided in the fixed mold to the resin injection hole of the metal plate and filling the recess. Forming and forming a flange larger than the fixing hole by causing the resin to wrap around the back side of the cited reference metal plate from each fixing hole and preventing the resin filled in each resin injection hole A method for manufacturing an insert-molded part, characterized in that the structure is configured to perform. In the manufacturing method of the insert molded component according to claim 2,
A method of manufacturing an insert-molded part, wherein a concave portion is formed at a position overlapping the fixing hole of the stationary mold, and the flange portion is formed by the concave portion.

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