JPH059142Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a molding device for molding a cover that can be opened and closed on a case body to house a floppy disk, audio cassette, etc. .

[Conventional technology]

For example, a case that houses a 3.5-inch floppy disk is known to have a cover attached to the case body so that it can be opened and closed. As shown in FIG. 3, this cover 1 includes a substantially square top plate 2, a pair of side plates 3 formed at three edges of the top plate 2 in a direction perpendicular to the top plate 2, and It has a box shape and is composed of a back plate 4 and a strip-shaped lower plate 5 formed on the side plates 3 and the back plate 4 and arranged parallel to the upper plate 2. In addition, attachment holes 6 are formed in each side plate 3 of this cover 1, and by engaging these attachment holes 6 with protrusions formed on the case body, the cover 1 is centered around the protrusions on the case body. It is designed to open and close (rotate).

By the way, when molding the cover 1 configured as described above, each inner surface of the top plate 2, side plates 3, back plate 4, and bottom plate 5 of the cover 1 and the mounting hole 6 of the side plate 3 are formed into undercut portions. Therefore, the third
As shown in the figures to FIG. 5, the mold for forming the cover 1 includes a fixed mold 7 forming the outer surface of the upper plate 2 of the cover 1, a first block 8a forming the outer surface of the back plate 4, and a lower mold. A second block 8 forming the outer surface of the plate 5
b and a third block 8c forming the outer surface of the side plate 3; A first slide core 9 to be formed, a slide pin 10a which is provided movably in a direction perpendicular to the respective moving directions of the movable die 8 and the first slide core 9, and which passes through the third block 8c; It is mainly composed of a core body 10b that supports a slide pin 10a, and a second slide core 10 that forms the mounting hole 6 of the cover 1.
When the mold is opened, the slide cores 9 and 10 are connected to the inclined pins 11a and 1 attached to the fixed mold 7, respectively.
1b, it is adapted to move in a direction perpendicular to the direction of movement of the movable mold 8. The reference numeral 12 in FIG. 3 is a hole for inserting an inclined pin formed in the first slide core 9, and the reference numeral 13 in FIG.
This is a fixed block that is provided on the fixed mold 7 and prevents the slide core 10 from moving during molding.

[Problem that the invention attempts to solve]

However, in the conventional cover molding die described above, as shown in FIG. 4, the end surface 3a of the side plate 3 of the cover 1 is formed by the first slide core 9. When the slide core 9 moves downward in FIG.
The inner surface of is pulled together with the slide core 9,
A force acts on the side plate 3 of the cover 1 in the direction of movement of the slide core 9, and as a result, the second slide core 1
A problem has arisen in that the shape of the mounting hole 6 of the side plate 3 in which the slide pin 10a of No. 0 is fitted is deformed.

This invention was made in view of the above circumstances,
The object is to provide a cover molding device that can prevent the mounting hole formed in the side plate from being deformed and can mold a product of good quality.

[Means for solving problems]

In order to achieve the above object, the present invention provides a first slide core that forms the inner surface of the cover and a second slide core that forms the mounting hole of the side plate of the cover in a direction perpendicular to the mold opening/closing direction. A mold block is provided on the mold body so as to be freely drivable in directions orthogonal to each other, and is fixed to the mold body to form the outer surface of the side plate of the cover, and is configured to also serve as the end surface of the side plate, The slide cores are provided with an interlocking mechanism that sequentially moves the first and second slide cores when the mold is opened.

[Effect]

Regarding the mold device for molding the cover of the present invention,
When the mold is opened, the interlocking mechanism allows the mold block to hold the end surface of the side plate of the cover when the first slide core comes out of the inner surface of the cover, allowing the first slide core to move smoothly and remove the cover. No excessive force is applied to the mounting hole of the side plate of the cover, and the mounting hole of the side plate of the cover is not deformed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2. In this embodiment, each of the slide cores 9 and 9 of the conventional example shown in FIGS.
In this embodiment, new first and second slide cores 20, 21 and a third block 8d are provided in place of the first and third blocks 8c, and the other configurations are the same as those of the conventional example described above, so a description thereof will be omitted.

1 and 2 show an embodiment of the present invention, with FIG. 1 being a sectional view and FIG. 2 being a perspective view of the first slide core 20. FIG. In these figures, the first slide core 20 forms the inner surface of the cover 1 and is provided movably in a direction perpendicular to the direction of movement of the movable mold 8 (mold opening/closing direction). . In addition, the second slide core 21
are a slide pin 21a forming the mounting hole 6 of the side plate 3 of the cover 1, and this slide pin 21a.
and a core body 21b that supports the movable die 8 and the first slide core 20, and is provided movably in a direction perpendicular to the movement directions of the movable mold 8 and the first slide core 20.
Furthermore, the third block 3d is similar to that shown in FIGS.
As shown in the figure, it forms the outer surface and end surface 3a of the side plate 3 of the cover 1, and the back plate 4 of the cover 1.
The movable mold 8 is configured together with the first and second blocks 8a and 8b, which form the outer surface of the lower plate 5 and the outer surface of the lower plate 5, respectively. and,
When opening the mold, the first and second slide cores 20 and 21 are first moved in a direction perpendicular to the moving direction (mold opening direction) of the movable mold 8 by an inclined pin attached to the fixed mold side. 1 slide core 20 moves,
Then, the inclined pin 11 is inserted into the hole of the first slide core 20 so that the second slide core 21 moves.
b is inserted, and the second slide core 21
An inclined pin 11a is loosely fitted into the hole as shown in FIG. 5, and these inclined pins 11a, 11b and the fixed block 13 constitute an interlocking mechanism.

When molding the cover 1 using the molding device configured as described above, the fixed mold, the movable mold 8, the first slide cores 20, and the second slide cores 21 are used after the mold is closed, as in the conventional method. A molded article (cover 1) is formed by supplying molten resin into the cavity thus formed. When the mold is opened, the first slide core 20 is first moved in a direction perpendicular to the moving direction of the movable mold 8 in synchronization with the opening between the fixed mold 7 and the movable mold 8 as shown in FIG. and the first slide core 20
Pull it out from the inside of cover 1. In this case, the slide core 20 exerts a force on the side plate 3 of the cover 1 to move it in the moving direction of the slide core 20, but the end surface 3a of the side plate 3 of the cover 1 Since it is supported by the third block 8d, no excessive force is applied to the mounting hole 6 portion of the side plate 3 of the cover 1, and the mounting hole 6 portion is not deformed. Next, the second slide core 21 is attached to the movable mold 8 and the first slide core 20.
the second slide core 2 from the mounting hole 6 of the side plate 3 of the cover 1.
The slide pin 21a of No. 1 comes out smoothly, and the mold release of the cover 1 is completed.

[Effect of idea]

As explained above, the present invention provides a first slide core that forms the inner surface of the cover and a second slide core that forms the mounting hole of the side plate of the cover in a direction perpendicular to the mold opening/closing direction. A mold block is provided on the mold body so as to be movable in directions perpendicular to each other, and is fixed to the mold body to form the outer surface of the side plate of the cover. Sometimes, since these slide cores are provided with an interlocking mechanism that sequentially moves the first and second slide cores, when the mold is opened, the first slide core is moved from the inner surface of the cover by the interlocking mechanism. When coming out, the mold block holds the end face of the side plate of the cover, so that the first slide core moves smoothly, and no excessive force is applied to the mounting hole of the side plate of the cover, and the mold block holds the end face of the side plate of the cover. This has the excellent effect of preventing the mounting hole from being deformed and making it possible to mold a product of good quality.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a sectional view, Figure 2 being a perspective view of the first slide core, and Figures 3 to 5 showing a conventional cover. The molding die is shown, and FIG. 3 is a perspective view of the first slide core, and FIG. 4 is a cross-sectional view of the movable mold side.
FIG. 5 is a longitudinal sectional view of the mold. 1...Cover, 2...Top plate, 3...Side plate, 3a
... End face, 4 ... Back plate, 5 ... Lower plate, 6 ... Mounting hole, 8 ... Movable mold (mold body), 8d ... Third block (mold block), 11a, 11b ... Inclined pin (interlocking mechanism), 13... fixed block (interlocking mechanism), 20... first slide core, 21... second slide core.

Claims (1)

[Scope of utility model registration request] A back plate and a pair of side plates are integrally provided between an upper plate and a lower plate arranged in parallel to form a box shape, and mounting holes are formed in each of the side plates to form a cover. In the molding device, the first slide core forms the inner surfaces of the upper plate, the lower plate, the back plate, and both side plates of the cover, and the second slide core forms the mounting holes of the side plates of the cover. A mold block is provided on the mold body so as to be movable in a direction perpendicular to the mold opening/closing direction and perpendicular to each other, and is fixed to the mold body to form the outer surface of the side plate of the cover. While the structure is configured to also form the mold, when the mold is opened,
A mold device for molding a cover, characterized in that these slide cores are provided with an interlocking mechanism that moves the first slide core and then moves the second slide core.