JP2969612B2 - Mold equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus for molding a molded product such as a cover of a compact disk storage case.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a compact disk storage case. This compact disc storage case is a thin type for storing two discs. In the figure,
1 is a compact disc, and this compact disc 1
Has an opening 2 in the center. The compact disk storage case includes a base 6 and a pair of covers 7 rotatably supported on both sides (upper and lower surfaces in the figure) of the base 6. The compact discs 1 are removably housed between the cover 7 and the cover 7. The base 6
Is a molded article of resin, which comprises a substantially rectangular substrate portion 11 positioned parallel to the compact disk 1 stored therein, and side walls 12 formed on both right and left edges of the substrate portion 11, respectively. These side walls 12 are formed in both directions (upward and downward in the drawing) orthogonal to the substrate portion 11 and have a substantially T-shaped cross section with the substrate portion 11. At the center of the substrate portion 11, there are formed disk holding portions 13 projecting from both sides of the substrate portion 11 to hold the compact disk 1 detachably. These disk holding portions 13 are composed of a plurality of claws radially positioned and capable of being elastically displaced in the radial direction thereof, and are engaged with the opening holes 2 of the compact disk 1 in a freely detachable manner. Further, finger insertion holes 14 are formed at four corners of the substrate portion 11 so that the compact disk 1 can be gripped when the disk 1 is attached or detached. Further, the front and rear side edges of the substrate portion 11 are formed as projecting edges 15 projecting in opposite directions to each other, and the outer surface of the projecting edge 15 is provided with a cover 7.
A concave portion 16 is formed to allow a finger to be hooked on the substrate. At the same time, bearing holes 17 are respectively formed in the both side walls 12 so as to correspond to the two protruding edge portions 15 and sandwich the substrate portion 11, respectively, and concave engagement receiving portions 18 are respectively formed on the inner surfaces. Is formed.

The two covers 7 are molded products of a transparent resin, and have the same shape. As shown in FIGS. 4 to 6, each cover 7 has a substantially rectangular first surface portion 21 positioned parallel to the compact disk 1 stored therein, and parallel left and right ends of the first surface portion 21. A second surface portion 22 bent perpendicularly from the edge, and a third surface portion 23 bent perpendicularly from the rear edge of the first surface portion 21 to the same side as the second surface portion 22.
And a fourth bend perpendicularly from an end edge of the third surface portion 23 opposite to the first surface portion 21 and facing in parallel with the first surface portion 21.
It consists of a surface part 24. The second surface portion 22 and the third
The surface portion 23 and the fourth surface portion 24 are integrally continuous. On the outer surface of both the second surface portions 22, a support shaft 25 is provided at an end on the third surface portion 23 side.
Are respectively formed to protrude. And these spindles 25
Are rotatably fitted in opposed bearing holes 17 of the base 6, and a cover 7 is pivotally mounted on the base 6. Further, a pair of long holes 26 are respectively formed in the second surface portions 22 along the first surface portion 21. As a result, the edge of each of the second surface portions 22 along each of the long holes 26 is the second edge.
The elastic piece 27 is elastically displaceable in a direction intersecting with the surface portion 22. Further, a bulging portion bulging in an arc shape to a position facing the first surface portion 21 is provided at a central portion in a longitudinal direction of each elastic piece 27.
28 are formed respectively. These bulging portions 28 are for holding a label on the inner surface side of the first surface portion 21 together with the fourth surface portion 24. In addition, locking projections 29 are formed on the outer surfaces of the two elastic pieces 27 located apart from the fourth surface portion 24, respectively. The locking projections 29 are engaged with the engagement receiving portions 18 of the both side walls 12 of the base 6 to hold the cover 7 closed with respect to the base 6. A cutout portion 30 is formed at the edge of both second surface portions 22 between the elastic pieces 27.

Next, a mold apparatus for forming the cover 7 will be described with reference to FIGS. This mold device includes a fixed mold member 31 as a first mold member, a movable mold member 32 as a second mold member, and a first slide member as a third mold member. Core 33
And a plurality of second slide cores as fourth mold members
34, and these fixed-side mold members
A cavity 35 having the shape of the cover 7 is formed between the movable mold member 32, the first slide core 33 and the second slide core 34. In addition, the fixed mold member
The gate 31 is formed in the opening 31 to the cavity 35. The fixed mold member 31 is provided on the first surface 21 of the cover 7.
To form the outer surface. The movable mold member 32 is parallel to the second surface portion 22 and the third surface portion 23 and perpendicular to the fourth surface portion 24 with respect to the fixed mold member 31 (FIG. 5).
And the vertical direction in FIG.
23 and an outer surface of the fourth surface portion 24. The first slide core 33 is attached to the movable mold member 32 so as to be movable in a direction parallel to the first surface portion 21, the second surface portion 22, and the third surface portion 24 and perpendicular to the third surface portion 23. The inner surface of each of the surface portions 21, 22, 23, and 24 and the inner surface of the elastic piece 27 are formed. The second slide core 34
Is parallel to the first surface portion 21 with respect to the movable mold member 32 and the second
It is assembled so that it can move in the direction perpendicular to the surface part 22,
At least the outer surfaces of the long hole 26 and the elastic piece 27 are formed. That is, the second slide core 34 has a long hole.
The elastic member 27 has a convex portion 41 that forms the outer surface of the elastic piece 27 and a convex portion 41 that forms the outer surface of the elastic piece 27. On the other hand, the first slide core 33 is a second slide core.
34 has a concave portion 43 which is fitted with the convex portion 42 and forms a surface other than the outer surface of the bulging portion 28. Then, the fixed-side mold member 31
Angular pins 46 and 47 fixed to the slide core 3
3 and 34 are slidably inserted into the movable core member 32 and the movable core member 32 in conjunction with opening and closing of the fixed mold member 31 and the movable mold member 32. 34 move. The second slide core 34
The diameter of the through hole 48 is larger than the diameter of the angular pin 46 inserted into the through hole 48. This allows
At the start of mold opening between the fixed mold member 31 and the movable mold member 32, the movement start of the second slide core 34 is delayed more than the movement start of the first slide core 33. Locking blocks 50 and 51 for holding the slide cores 33 and 34 are fixed to the fixed mold member 31. FIG.
2 shows the moving direction of the slide cores 33 and 34 when the mold is opened. In the figure, arrow a indicates the first slide core.
33, the arrow b1 is the direction of movement of the second slide core 34 for one second surface 22, and the arrow b2 is the direction of movement of the second slide core 34 for the other second surface 22. It is. The second slide core 34 may be provided one for the whole second surface portion 22. May be provided.

Next, the operation of the above configuration will be described. When the cover 7 is formed, as shown in FIGS. 5 and 6, the fixed mold member 31 and the movable mold member 31 are used.
The fixed side mold member 31, the movable side mold member 32, the first slide core 33 and the second slide core
A cavity 35 is formed between 34. After that, the molten resin is poured into the cavity 35 from the gate 36. And
After the resin filled in the cavity 35 is solidified, the fixed mold member 31 and the movable mold member 32 are opened. With the opening of the mold, first, the fixed-side mold member 31 separates from the molded cover 7. At the same time, as shown by a chain line in FIG. 6, the angular pin 47 fixed to the fixed mold member 31 is used.
, The second slide core 34 moves in the directions b1 and b2 away from the second surface portion 22 of the cover 7 and the first slide core 33. Then, the second slide core 34
After the convex portion 42 of the first slide core 33 comes out of the concave portion 43 of the first slide core 33, that is, after the second slide core 34 moves to a position where the movement of the first slide core 33 is not hindered, An angular pin 46 fixed to 31 abuts on the right side of the peripheral surface of the through hole 48 of the first slide core 33 in the drawing,
Driven by the angular pins 46, the first slide core 33 moves in the direction a away from the third surface portion 23.
Then, as shown by a chain line in FIG.
33 comes out from between the first surface portion 21 and the fourth surface portion 24, and is protruded by a protruding member (not shown) to cover the cover 7.
Moves away from the movable mold member 32 and the first slide core 33. By the way, the bulging portion 28 on the second surface portion 22 of the cover 7 is
Is bulged to a position opposed to the first surface portion 21, and therefore bites into the recess 43 before the movement of the first slide core 33 when the mold is opened, and the first slide core when the mold is opened. An undercut occurs in the moving direction of the core 33. Therefore, as the first slide core 33 moves at the time of opening the mold, as shown by a chain line in FIG.
Is elastically displaced outward, so that the bulging portion 28
From the recess 43 of the slide core 33. That is, the first
When the first slide core 33 moves,
The swelling portion 28 is forcibly pulled out of the opening.

[0006]

However, in the above-mentioned conventional mold apparatus, the bulging portion 28 is sandwiched by the first slide core 33 from both sides in the direction perpendicular to the moving direction (vertical direction in the drawing). Therefore, when the bulging portion 28 comes out of the concave portion 43 while being elastically displaced with the movement of the first slide core 33, the elastic piece 27 having the bulging portion 28 can be freely displaced in the vertical direction in the drawing. Instead, the upper and lower surfaces of the elastic piece 27 rub against the first slide core 33. As a result, a force is applied to the elastic piece 27 in the vertical direction in the figure, and the elastic piece 27 is distorted. As a result, there is a problem that the elastic piece 27 is easily damaged such as a crack. In particular, cracks are likely to occur at the bases at both ends of the elastic piece 27, and in some cases, the bases may be broken.

SUMMARY OF THE INVENTION The present invention is directed to solving such a problem, in which the second surface portion and the third surface portion are separated from the edge of the first surface portion.
While the surface portion is bent to the same side, the fourth surface portion facing the first surface portion is bent from the edge of the third surface portion, and an elastic piece is formed on the second surface portion by a long hole along the first surface portion,
In a mold apparatus for molding a molded product in which a bulging portion bulging to a position opposed to a first surface portion is formed on the elastic piece, a mold member forming an inner surface of each surface portion includes a first surface portion and a second surface portion. When the bulging portion is forcibly removed from the mold member by moving along the mold member, the elastic piece is prevented from being damaged such as a crack.

[0008]

In order to achieve the above object, the present invention provides a first surface portion, a second surface portion bent from a pair of parallel edges of the first surface portion, and a first surface portion. A third surface portion bent from the other edge to the same side as the second surface portion, and a fourth surface portion bent from the edge of the third surface portion and opposed to the first surface portion.
And a long hole is formed in the second surface along the first surface, and an edge of the second surface along the long hole is formed as an elastic piece. In a mold apparatus for molding a molded product having a bulging portion bulging to a position facing the first surface portion, a first mold member forming an outer surface of the first surface portion, and the first metal member The fourth member is parallel to the second surface portion and the third surface portion with respect to the mold member and the fourth member.
A second mold member movable in a direction intersecting with the surface portion and forming outer surfaces of the third surface portion and the fourth surface portion; and a first surface portion, a second surface portion, and a second surface member with respect to the second mold member. A third mold member movable parallel to the four surface portions and in a direction intersecting the third surface portion and forming the inner surface of each of the surface portions and the inner surface of the elastic piece; A fourth mold member movable in a direction intersecting the two surface portions and forming an outer surface of the elongated hole and the elastic piece; and a bulging portion of the elastic piece and the bulging portion of the fourth mold member. A projection is formed between the first surface and the inner surface of the first surface facing the portion.

[0009]

In the mold apparatus of the present invention, at the time of molding, the first mold member, the second mold member, the third mold member, and the fourth mold member are clamped to form these mold members. A resin is filled in a cavity formed between the mold members. Then, after the resin filled in the cavity is solidified, the first mold member and the second mold member are opened, and the molded product is first released from the first mold member, The fourth mold member is moved away from the third mold member and the second surface. And the fourth
To the position where the third mold member does not hinder the movement of the third mold member, and between the bulging portion in the fourth mold member and the inner surface of the first surface portion facing the bulging portion. After the convex portion located at the position is moved until it comes off between the bulging portion and the inner surface of the first surface portion, the third mold member is moved along the first surface portion, the second surface portion, and the fourth surface portion along the first surface portion. Move in the direction away from the three surfaces. After the third mold member comes off between the first surface portion and the fourth surface portion, the molded product is released from the second mold member and the third mold member. During the movement of the third mold member, the second
The bulging portion bulging from the surface portion to a position facing the first surface portion,
When the elastic piece having the bulging portion is elastically displaced in the direction along the first surface portion, the elastic piece is forcibly removed from the second mold member forming the inner surface of the elastic piece. At this time, as described above, since the convex portion of the fourth mold member is removed from between the bulging portion and the inner surface of the first surface portion, the elastic piece escapes in a direction approaching the first surface portion. Together with this, the resistance applied from the mold member to the surface of the elastic piece opposite to the first surface portion is reduced, and the elastic piece is smoothly displaced in the direction along the first surface portion. This prevents the elastic piece from being distorted and from being damaged.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the mold apparatus according to the present invention will be described below with reference to FIG. The mold apparatus of the present embodiment is for forming the cover 7 of the compact disk storage case as described above and shown in FIG. And
Since the mold apparatus of this embodiment has substantially the same configuration as the mold apparatus shown in FIGS. 4 to 6 described above, the corresponding parts are denoted by the same reference numerals and the description thereof will be omitted. Omitted. In the following description, FIG. 4 and FIG. 5 are also cited. In the mold apparatus of the present embodiment, in the second slide core 34, the convex portion forming the long hole 26 of the second surface portion 22 of the cover 7
When the mold is clamped, the convex portion 56 becomes at least the entire surface (the upper surface in the drawing) of the bulging portion 28 of the elastic piece 27 on the first surface portion 21 side and the inner surface of the first surface portion 21 facing this surface. It is assumed to be located between. On the other hand, the first slide core 33
A concave portion 57 into which the convex portion 56 is fitted at the time of mold clamping.

Next, the operation of the above configuration will be described. When the cover 7 is molded, the fixed mold member 31, which is the first mold member, and the movable mold member 32, which is the second mold member, are clamped, and these fixed mold members 31, Movable mold member 32, first slide core 33 as a third mold member, and second slide core as a fourth mold member
A cavity 35 is formed between 34. In such a mold clamping state, the projection 56 of the second slide core 34 is
In the recess 57 of the slide core 33. Then, the molten resin is poured into the cavity 35. After the resin filled in the cavity 35 is solidified, the fixed mold member 31 and the movable mold member 32 are opened. With the opening of the mold, first, the fixed-side mold member 31 separates from the molded cover 7. At the same time, the second slide core 34 moves in the directions b1 and b2 away from the second surface portion 22 of the cover 7 and the first slide core 33. Next, as shown by a chain line in FIG. 1, the protrusions 42, 56 of the second slide core 34 are formed.
Is removed from the recesses 43 and 57 of the first slide core 33, that is, the second slide core 34 is
To the position where the movement of the elastic piece 27 is not hindered.
And the bulging portion 28 moves from the space between the bulging portion 28 and the inner surface of the opposing first surface portion 21 until the convex portion 56 comes off.
Moves along the first surface portion 21, the second surface portion 22, and the fourth surface portion 24 in the direction a away from the third surface portion 23. Then, after the first slide core 33 comes off from between the first surface portion 21 and the fourth surface portion 24, it is protruded by a protruding member (not shown), and the cover 7 is moved to the movable mold member 32 and the first side. Move away from slide core 33.

As described above, when the first slide core 33 moves when the mold is opened, the swelling portion 28 swelling from the second surface portion 22 to a position facing the first surface portion 21 is formed. When the elastic piece 27 having the elastic piece 27 is elastically displaced outward in the direction along the first surface portion 21, the elastic piece 27 is forcibly removed from the concave portion 43 of the first slide core 33 forming the inner surface of the elastic piece 27. At this time, as described above, since the protrusion 56 of the second slide core 33 is removed from between the bulging portion 28 and the inner surface of the first surface portion 21 facing the bulging portion 28, the elastic piece 27 can be freely displaced in a direction approaching the first surface portion 21 (upward in the figure). In conjunction with this, the friction between the first slide core 33 and the surface (the lower surface in the figure) of the elastic piece 27 opposite to the first surface portion 21 is reduced, that is, the lower surface of the elastic piece 27 with respect to the illustrated lower surface is reduced. Since the resistance applied from the first slide core 33 is reduced, the force applied to the elastic piece 27 in the vertical direction in the drawing is also reduced, and the elastic piece 27 is smoothly displaced in the direction along the first surface portion 21. This prevents the elastic piece 27 from being distorted and the elastic piece 27 from being damaged such as a crack.

FIG. 2 shows another embodiment of the present invention. In FIG. 2, reference numeral 61 denotes a long hole, 62 denotes an elastic piece, and 63 denotes a bulging portion. It is almost the same as that of the cover 7. However, the first surface portion 21 of the elastic piece 62
The edge on the side (upper side in the figure) is a concave edge 64 curved in a smooth arc shape and concavely. Thereby, the elastic piece
Reference numeral 62 indicates that the width in the vertical direction in the drawing gradually increases as it approaches the roots at both ends. According to such a configuration, the strength of the root portion of the elastic piece 62, which tends to cause a crack, is originally improved. Further, the bulging portion 63 having a larger amount of undercut in the moving direction of the first slide core 33.
Since the width of the central portion is small, the central portion of the bulging portion 63 is easily deformed. From these facts, when the bulging portion 63 is forcibly pulled out of the concave portion 43 along with the movement of the first slide core 33 when the mold is opened, it is possible to more reliably prevent the elastic piece 62 from being damaged.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
The present invention is not limited to the cover 7 of the compact disc storage case as described above, and the second surface portion and the third surface portion are bent to the same side from the edge of the first surface portion, and the second surface portion and the third surface portion are bent from the edge of the third surface portion. A fourth surface portion facing the first surface portion is bent, and an elastic piece is formed in the second surface portion by a long hole along the first surface portion, and a bulging portion bulging to a position facing the first surface portion is formed on the elastic piece. It can be applied to formed molded articles in general.

[0015]

According to the present invention, the second surface portion and the third surface portion are bent to the same side from the edge of the first surface portion, and the fourth surface portion facing the first surface portion from the edge of the third surface portion. Is bent to form an elastic piece in the second surface portion by a long hole along the first surface portion, and to form a molded product having a bulging portion bulging to a position facing the first surface portion in the elastic piece. To
A first mold member forming the outer surface of the first surface portion, a second mold member forming the outer surface of the third surface portion and the fourth surface portion, and a second mold member forming the inner surface of each of the surface portions and the inner surface of the elastic piece. In a mold apparatus provided with a third mold member and a fourth mold member forming an outer surface of the elongated hole and the elastic piece, the fourth mold member has a bulge portion and a bulge portion facing the bulge portion. Since the convex portion located between the inner surface of the first surface portion was formed, the fourth mold member was moved, and after the convex portion was pulled out from between the bulging portion and the inner surface of the first surface portion, If the third mold member is moved along the first surface portion and the second surface portion and the bulging portion is forcibly removed from the third mold member, the elastic piece can escape in a direction approaching the first surface portion. In combination with this, the resistance applied from the mold member to the surface of the elastic piece opposite to the first surface portion is reduced, and the elastic piece follows the first surface portion. By smoothly displaced toward, distortion occurs in the elastic piece, it is possible to prevent damage such as cracks in the elastic piece.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a mold apparatus of the present invention.

FIG. 2, showing another embodiment of the present invention, is a side view of the vicinity of an elastic piece of a cover which is a molded product.

FIG. 3 is a perspective view of a compact disk storage case.

FIG. 4 is a bottom view of the cover.

FIG. 5 is a cross-sectional view showing an example of a conventional mold apparatus, and corresponds to a cross section taken along line AA of FIG.

6 is a sectional view of the same, corresponding to a section taken along line BB of FIG. 4;

[Explanation of symbols]

 7 Cover (molded product) 21 First surface portion 22 Second surface portion 23 Third surface portion 24 Fourth surface portion 26 Long hole 27 Elastic piece 28 Swelling portion 31 Fixed mold member (first mold member) 32 Movable mold Mold member (second mold member) 33 First slide core (third mold member) 34 Second slide core (fourth mold member) 56 Convex part 61 Long hole 62 Elastic piece 63 Swelling Department

Claims (1)

(57) [Claims] 1. A first surface portion, a second surface portion bent from a pair of parallel edges of the first surface portion, and a second surface portion bent from another edge of the first surface portion to the same side as the second surface portion. A third surface portion and a fourth surface portion bent from an edge of the third surface portion and opposed to the first surface portion.
And a long hole is formed in the second surface along the first surface, and an edge of the second surface along the long hole is formed as an elastic piece. In a mold apparatus for molding a molded product having a bulging portion bulging to a position facing the first surface portion, a first mold member forming an outer surface of the first surface portion, and the first metal member The fourth member is parallel to the second surface portion and the third surface portion with respect to the mold member and the fourth member.
A second mold member movable in a direction intersecting with the surface portion and forming outer surfaces of the third surface portion and the fourth surface portion; and a first surface portion, a second surface portion, and a second surface member with respect to the second mold member. A third mold member movable parallel to the four surface portions and in a direction intersecting the third surface portion and forming the inner surface of each of the surface portions and the inner surface of the elastic piece; A fourth mold member movable in a direction intersecting the two surface portions and forming an outer surface of the elongated hole and the elastic piece; and a bulging portion of the elastic piece and the bulging portion of the fourth mold member. A mold device, wherein a convex portion located between the inner surface of the first surface portion facing the portion is formed.