JPH0890610A - Mold device for molding case member - Google Patents

Abstract

PURPOSE: To prevent a projected piece part and thereabouts of a case member from being broken by a resistance in releasing it from a mold. CONSTITUTION: A case member 32 has a bearing hole 59 in a projected piece part 57 on the side face part thereof. An outer surface of the side face part including the projected piece part 57 is formed by a second slide core 74 moving in a direction X relatively to a movable mold 72. A third slide core 75 forming the bearing hole 59 is supported on the second slide core 74 slidably in the direction X. The second slide core 74 is driven by an angular pin 81 provided on a stationary mold 71. The third slide core 75 is pressed in a mold release direction by a spring 91. At the time of closing a mold, the third slide core 75 is pressed against a locking block 95 provided on the stationary mold 71. In this manner, at the time of opening the mold, the third slide core 75 is extracted from the bearing hole 59 before the release of the second slide core 74. This two-step mold release operation ensures the reduction of a resistance in releasing the projected piece 57 from the mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device for molding a case member such as a resin-made compact disc storage case.

[0002]

2. Description of the Related Art In a storage case such as a compact disk (CD), a pair of case members made of an integrally molded synthetic resin are pivotally attached to each other. FIG. 8 shows the hinge portion of one case member. In the figure,
Reference numeral 1 denotes a planar main surface portion of the case member, and side surface portions 2 are vertically bent from both left and right edges of the main surface portion 1, respectively.
Further, there is a rear surface portion 3 that is bent from the rear edge of the main surface portion 1 in the same direction as the side surface portion 2, and further, a facing portion 4 that opposes the main surface portion 1 is vertically bent from the tip edge of the rear surface portion 3. There is.
Thus, the pocket portion 5 is formed between the main surface portion 1 and the facing portion 4. Further, slit portions 6 are formed between the pocket portion 5 and the both side surface portions 2, respectively, so that the rear end side of the both side surface portions 2 becomes a projecting piece portion 7. Further, these projecting piece portions 7 are formed with a projecting portion 8 projecting to the side opposite to the main surface portion 1, and a bearing hole 9 is formed therethrough. The outer surface of the tip of the projecting piece 7 has an arcuate portion 10 on the main surface 1 side, but is square on the opposite side.

In the mold device for molding the case member as described above, the mold opening direction of the fixed mold and the movable mold is determined by the main surface portion 1.
It is natural to set it in the direction (Z direction) orthogonal to.
However, with respect to the Z direction, the pocket portion 5 and the bearing hole 9
Since they have an undercut shape, the slide core and the side surface portion 2 that move in the direction (Y direction) orthogonal to the rear surface portion 3
A slide core that moves in a direction (X direction) orthogonal to is required. FIG. 7 shows an example of a conventional mold device. In the figure, 16 is a fixed type and 17 is a movable type. The fixed die 16 mainly forms the outer surface of the main surface portion 1 and the outer surface of the rear surface portion 3, and the movable die 17 mainly forms the outer surface of the facing portion 4. Further, the movable die 17 supports a first slide core 18 forming the inner surfaces of the pocket portion 5, the main surface portion 1 and the side surface portion 2 so as to be slidable in the Y direction. A pair of second slide cores 19 forming the outer surface are slidably supported in the X direction. A pin 20 forming the bearing hole 9 is fixed to the second slide core 19. The slide cores 18 and 19 are driven by the angular pins 21 fixed to the fixed mold 16 as the molds are opened and closed. This angular pin 21
Is slightly inclined with respect to the Z direction, and the slide core 1
It is removably inserted into the inclined holes 22 formed in 8 and 19 and having the same inclination. Further, a locking block 23 that presses the slide cores 18 and 19 when the mold is closed is fixed to the fixed mold 16. And Angular Pin 21
There is a gap between the and the inclined hole 22, but when the mold is closed,
The gap 24 on the fixed mold 16 side is larger in the first slide core 18 than in the second slide core 19.

At the time of molding, as shown in FIG. 7 (a), the mold is closed to form a cavity 26 in the shape of a product, that is, a case member between the fixed mold 16, the movable mold 17, and the slide cores 18 and 19, and fixed. From the gate on the mold 16 into the cavity 26,
The thermoplastic resin melted by heating is filled. After the resin filled in the cavity 26, that is, the case member is cooled and solidified, the mold is opened, and the fixed mold 16 and the movable mold 17 are moved to Z
Move away from each other in the direction. With this mold opening, first, the fixed mold 16 is separated from the molded case member. Then, Fig. 7
As shown in (b), the angular pin 21 abuts the peripheral surface of the inclined hole 22 of the second slide core 19, and the second slide core 19 moves in conjunction with the movement of the fixed die 16 to move the case member. The pin 20 comes out of the bearing hole 9 while being separated from the outer surface of the side surface portion 2. Thereafter, an angular pin (not shown) hits the peripheral surface of the inclined hole of the first slide core 18, and the first slide core 18 moves in association with the movement of the fixed die 16 and comes out of the pocket portion 5. After that, the case member is ejected by an ejection pin (not shown) to separate from the movable die 17. A mold release agent is used to enhance the mold release property of the case member.

[0005]

However, the conventional mold device has the following problems. That is, when the second slide core 19 moves when the mold is opened, the side surface portion 2 including the projecting piece portion 7 has to be stopped by the movable mold 17. Due to the resistance, it is easy to follow the second slide core 19. Therefore, as shown in FIG. 8, a crack 27 may occur in the base portion of the protruding piece portion 7. One of the reasons for increasing the mold release resistance between the second slide core 19 and the protruding piece portion 7 is the pin 20.
And the bearing hole 9 are fitted together. This fit becomes tight due to the shrinkage of the resin as it cools. Therefore, an attempt was made to increase the taper angle α of the bearing hole 9 from 3 ° to 10 °, but it was not so effective. Further, in order to prevent stress concentration, the inner corner portion 6a of the slit portion 6 is formed in an arc shape, but this is also insufficient.

The present invention is intended to solve such a problem, and in a mold device for molding a case member having a protruding piece portion having a bearing hole, a crack or the like near the protruding piece portion is released at the time of mold release. The purpose is to prevent damage. Furthermore, it aims at simplifying the structure for preventing this damage.

[0007]

In order to achieve the former object, the invention of claim 1 has a main surface portion, a side surface portion bent from a side edge of the main surface portion, and a shape in which the side surface portion extends. In a molding die device for a case member having a projecting piece projecting with the projecting piece and having a bearing hole in the projecting piece, the outer surface of the main surface portion is formed and moves in a first direction intersecting with the main surface portion. A first die member, a second die member that forms an outer surface of the side surface portion and moves along the main surface portion in a second direction intersecting with the side surface portion, and the second hole forming the bearing hole. Third mold member that moves in the second direction with respect to the mold member, and a second mold member drive mechanism that moves the second mold member in a direction away from the case member when the mold is opened. When the mold is opened, the third mold member is separated from the case member prior to the second mold member. It is obtained by a third mold member driving mechanism for moving the that direction.

According to a second aspect of the present invention, in the die unit for molding a case member according to the first aspect of the present invention, in order to achieve the latter object as well, the second die member drive mechanism includes the first die member drive mechanism. An angular pin integrally provided on one mold member and having a directionality different from the first direction and the second direction; and a first mold member provided on the second mold member when the mold is closed. And an angular hole into which the angular pin is inserted in parallel in a state where a gap is formed on the side, and the third mold member is supported by the second mold member so as to be slidable in the second direction. The third mold member drive mechanism causes the first mold member to have a spring for urging the third mold member in a direction away from the case member with respect to the second mold member. When the mold is closed, the third mold member is integrally provided in the direction opposite to the biasing direction of the spring. It is made of and even locking block to give.

[0009]

According to the mold apparatus for molding a case member of the invention of claim 1, resin is filled between the mold members closed, and the mold is opened after the filled resin, that is, the case member is solidified. At this time, the first mold member moves in a first direction intersecting with the main surface portion of the case member to move away from the outer surface of the main surface portion, and the second mold member driving mechanism drives the second mold member.
The mold member moves along the main surface portion in the second direction intersecting the side surface portion and moves away from the outer surface of the side surface portion including the protruding piece portion, and the third mold member drive mechanism drives the third mold member The mold member moves in the same second direction and comes out of the bearing hole of the protruding piece portion. At that time, the third mold member is removed from the bearing hole before the second mold member is separated from the side surface part, and the second mold member is removed from the bearing hole until the third mold member is removed from the bearing hole. The mold member holds down the side surface including the protruding piece. By performing the mold release in two stages in this manner, the mold release resistance of the projecting piece is reduced, and the base of the projecting piece is prevented from being damaged such as cracks.

Further, in the die unit for molding a case member according to the second aspect of the present invention, when the first die member starts to open, the third die by the locking block provided in the first die member. When the pressing of the mold member is released, the third mold member immediately starts moving due to the urging of the spring, and the third mold member comes out of the bearing hole. In the meantime, the gap on the first die member side between the angular pin provided on the first die member and the inclined hole of the second die member is closed, and when this gap disappears, the angular pin Second pushed by
The mold member starts to move and separates from the side surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, the structure of a CD storage case using a case member will be described with reference to FIG. This CD storage case is a slim type without a tray, in which a main body side case member 31 and a lid side case member 32 are pivotally attached to each other so as to be rotatable and openable. Both case members 31 and 32 are integrally molded products of transparent thermoplastic resin.

The case member 31 on the main body side is provided on the left and right edges and the front edge of the inner surface of the main surface portion 33 having a substantially square shape.
A low side surface portion 34 and a front surface portion 35 are formed so as to vertically project. Further, the arm portions 36 are formed so as to project rearward from both end portions of the rear edge of the main surface portion 33, and the projecting piece portions project further rearward from these arm portions 36.
37 are formed so as to extend the side surface portions 34, and support shaft portions 38 are formed on the outer surfaces of the side surface portions 34 so as to project therefrom. The side portions 34 are lacking in the central portion,
Therefore, notches 39 are formed on the left and right edges of the main surface portion 33. Further, recesses 41 and 42 recessed inward are formed in the side surface portions 34 located in front of and behind the cutout portion 39, respectively. In particular, a locking hole 43 is formed through the front recess 41. In addition, a concave finger hooking portion 44 is formed at the center of the outer surface of the front surface portion 35. Further, the main surface portion
The inner surface of 33 has an arcuate ridge that forms a CD storage portion inside.
45 are formed at the four corners, and a CD holding portion 46 that is detachably fitted in the central hole of the CD is formed in the central portion.

In the lid-side case member 32, side surface portions 52 are vertically bent from both left and right edges of a flat substantially rectangular main surface portion 51. Further, there is a rear surface portion 53 that is bent vertically from the rear edge of the main surface portion 51 in the same direction as the side surface portion 52, and further, a facing portion 54 that faces the main surface portion 51 is vertically bent from the tip edge of the rear surface portion 53. ing. In this way, between the main surface portion 51 and the facing portion 54, the pocket portion 55 opening to the front is formed. Further, a slit portion 56 is formed in the main surface portion 51 located between the pocket portion 55 and the both side surface portions 52, respectively.
A projecting piece portion 57 is formed by projecting rearward in a shape in which 52 is extended. Further, a convex portion 58 that protrudes to the side opposite to the main surface portion 51 is formed on these projecting piece portions 57, and a bearing hole 59 is formed therethrough. As shown in detail in FIG. 6, the outer surface of the tip portion of each of the projecting piece portions 57 is an arc-shaped portion 61 having a large curvature from the main surface portion 51 side to the opposite side. Further, the front and rear parts of the side surface parts 52 have through-grooves 6 along the main surface part 51.
2 and 63 are respectively formed, and these through grooves 62 and 63 are formed.
Label pressing parts 64 and 65 with the leading edge side bulging inward
It has become. In particular, locking protrusions 66 are formed at the center of the inner surface of the front label pressing portion 64, respectively. In addition, it is located between the front and rear label retainers 64 and 65,
A convex portion 67 is formed on each of the tip edges of the 52.

Then, both support shaft portions 38 of the main body side case member 31.
Are fitted into the bearing holes 59 of the lid side case member 32,
Both case members 31, 32 are pivotally attached to each other. The projecting piece portion 37 of the main body side case member 31 is located in the slit portion 56 of the lid side case member 32. Further, in the state where both case members 31, 32 are butted and closed, the main surface portion of the main body side case member 31 is
33, the facing portion 54 of the lid-side case member 32, and the convex portions 58 and 67 are located on the same plane. Particularly, the central convex portion 67 of the side surface portion 52 of the lid side case member 32 is a cutout portion of the main body side case member 31.
Located at 39. Further, although the label pressing portions 64 and 65 of the lid side case member 32 are housed in the concave portions 41 and 42 of the main body side case member 31, respectively, the locking holes 43 of the front side concave portion 41 lock the front label pressing portion 64. The projections 66 are engaged with each other and the case members 31 and 32 are held in a closed state.

Next, the structure of the molding die for the lid side case member 32 will be described with reference to FIGS. 1 to 4. 71 is the first
Fixed mold, which is the mold member of 72, 72 is a movable mold, these fixed molds
The 71 and the movable die 72 move in a first direction (Z direction) orthogonal to the main surface portion 51 to open and close each other. The fixed die 71 mainly forms the outer surface of the main surface portion 51 and the outer surface of the rear surface portion 53, and the movable die 72 mainly forms the outer surface of the facing portion 54. Further, the movable die 72 supports the first slide core 73 slidably in a direction (Y direction) orthogonal to the rear surface portion 53, and also includes a pair of second die members which are second die members. Second slide core 74 is orthogonal to the side surface portion 52
Is supported slidably in the direction (X direction). The first slide core 73 forms the inner surfaces of the pocket portion 55, the main surface portion 51 and the side surface portion 52 which are undercut in the Z direction and the X direction. Each of the second slide cores 74 has an outer surface of each side surface portion 52 including the protruding piece portion 57, through grooves 62 and 63 having an undercut shape in the Z direction and the Y direction, and an arcuate portion of the protruding piece portion 57. 61 and 61 are formed. Further, a pin-shaped third slide core 75, which is a third mold member, which forms the bearing holes 59 of the respective projecting piece portions 57, is slidable in the X direction on both of the second slide cores 74. Supported by.

Each of the second slide cores 74 is driven by a second slide core drive mechanism, which is a second mold member drive mechanism, in association with the movement of the fixed die 71. There is. The second slide core drive mechanism has an angular pin 81 fixed to a fixed die 71.
The angular pin 81 is located on the XZ plane and is slightly inclined with respect to the Z direction. The inclination is a direction away from the case member 32 toward the movable mold 72.
Further, the second slide core 74 is formed with an inclined hole 82 which is parallel to the angular pin 81 and which is removably inserted therein. Further, a locking block 83 that holds down the second slide core 74 when the mold is closed is fixed to the fixed mold 71. The second slide core 74 and the locking block 83 are formed with inclined surfaces 84 and 85 which are parallel to the angular pin 81 and the inclined hole 82 and abut against each other when the mold is closed. In the mold closed state, a gap 86 is formed between the angular pin 81 and the peripheral surface of the inclined hole 82.

Although not shown, the first slide core 73 is also driven by a drive mechanism composed of an angular pin and a locking block in association with the movement of the fixed die 71. There is. However, in the mold closed state, the gap 86 generated on the fixed mold 71 side between the angular pin 81 and the peripheral surface of the inclined hole 82 is the second slide core 74.
The first slide core 73 is larger than the first slide core 73.

Further, the both third slide cores 75 are
Each of them is driven by a third slide core drive mechanism, which is a third mold member drive mechanism, in conjunction with the movement of the fixed die 71. The third slide core drive mechanism has a coiled spring 91 that biases the third slide core 75 against the second slide core 74 in a direction away from the case member 32. The spring 91 is mounted between the slide core base 92 fixed to the third slide core 75 and the second slide core 74. The slide core base portion 92 is located between the stopper portions 93 and 94 provided on the second slide core 74, so that the third slide core 75 can move only within a predetermined range. Also,
The fixed mold 71 has a locking block 95 for pressing the third slide core 75 against the bias of the spring 91 when the mold is closed.
Has been fixed. The third slide core 75 and the locking block 95 include the second slide core 74.
Slopes 8 parallel to each other and abutting each other when the mold is closed 9
6 and 97 are formed respectively.

At the time of molding, as shown in FIG.
Mold closed and fixed 71, movable 72 and slide cores 73, 7
A cavity 101 in the shape of the product, that is, the lid-side case member 32 is formed between 4 and 75. Especially, the third slide core
75 is pressed by the locking block 95 of the fixed mold 71 to resist the bias of the spring 91, and the first slide core 73
Hit against. In this state, the thermoplastic resin melted by heating is filled into the cavity 101 from the gate (not shown) in the fixed mold 71. At this time, by pressing the locking blocks 83, 95 against the resin pressure,
The slide cores 73, 74, 75 are held in place. However, the resin pressure is not applied to the third slide core 75, which only forms the bearing hole 59, originally.

After the resin filled in the cavity 101, that is, the lid side case member 32 is cooled and solidified, the mold is opened, and the fixed mold 71 and the movable mold 72 are separated from each other in the Z direction. With this mold opening, as shown in FIG.
71 is separated from the lid-side case member 32 formed. At the same time, as soon as the mold opening starts, the pressing of the third slide core 95 by the locking block 95 of the fixed mold 71 begins to be released, and the third slide core 75 is moved by the spring 91. First, the bearing hole 59 of the lid side case member 32
Begins to break out. In this way, the third slide core 75 moves in the X direction in conjunction with the fixed die 71, and comes out of the bearing hole 59.

In the mold closed state, the angular pin 81 and the inclined hole
Since there is a gap 86 on the fixed die 71 side between the peripheral surface of 82 and the peripheral surface of 82, even if the fixed die 71 moves, the first slide core 73 and the second slide core 74 remain Movable type 72
Do not move against. Therefore, the third slide core
When 75 starts to come out of the bearing hole 59, the second slide core
74 presses the side surface portion 52 including the protruding piece portion 57 of the lid side case member 32. When the gap 86 disappears, as shown in FIG. 3, the second slide core 75 starts to move in the X direction by being pushed by the angular pin 81, and separates from the side surface portion 52 including the protruding piece portion 57.

Further, after the second slide core 75 moves and comes out of the through grooves 62 and 63 of the lid side case member 32, the first slide core 73 further starts moving in the Y direction, and the lid side case member. Get out of the pocket part 55 of 32. The label pressing portions 64, 65 of the lid-side case member 32 are forcibly pulled out by their own elasticity.

Thereafter, the lid side case member 32 is pushed out in the Z direction by a push pin (not shown),
It is taken out of the movable mold 72 and taken out.

After that, the mold is closed again, and the above molding cycle is repeated. With the mold closing,
The first slide core 73 and the second slide core 74 move in the opposite direction in conjunction with the fixed die 71 by the angular pin 81, but finally, the slide core 73 is pressed by the locking blocks 83, 95. , 74, 75 are restricted, and a gap 86 is formed on the fixed mold 71 side between the angular pin 81 and the peripheral surface of the inclined hole 82.

As described above, according to the configuration of the above-described embodiment, the mold release of the side surface portion 52 having the bearing hole 59 of the lid side case member 32 is performed in two stages, and the second slide core 74 is projected by the protruding piece portion 57. Since the third slide core 75 is allowed to come out of the bearing hole 59 of the projecting piece 57 before it is separated from the side surface part 52 including, the release resistance of the projecting piece 57 becomes small. Therefore, it is possible to prevent damage such as a crack from occurring in the base portion of the projecting piece portion 57.

Since the bearing hole 59 has a tapered shape, it is not necessary to completely remove the entire third slide core 75 from the bearing hole 59 by the first movement of the third slide core 75. When the third slide core 75 moves integrally with the core 74, the entire third slide core 75 may be completely removed from the bearing hole 59. However, bearing hole
If 59 is cylindrical, the first third slide core
It is better to start the movement of the second slide core 74 after the whole is completely removed from the bearing hole 59 by the movement of only 75.

Further, since the third slide core 75 is adapted to operate in conjunction with the fixed mold 71 by utilizing the spring 91 and the locking block 95, the structure for this operation can be simplified. In order to operate the third slide core 75 with a time difference from the second slide core 74, this third slide core 75 is operated.
Although the slide core 75 can be driven by a fluid pressure cylinder, if the fluid pressure cylinder is used as a drive mechanism, the space is taken up and the constraint on the arrangement of the mold members becomes large. On the other hand, according to the configuration of the above-described embodiment, the drive mechanism for the slide cores 74 and 75 can be made compact and restrictions on the arrangement of the mold members can be reduced.

Further, in the product shape, the outer surface of the tip end portion of the projecting piece portion 57 is formed into the arcuate portion 61 having a large curvature from the main surface portion 51 side to the opposite side, so that the second slide core 74 is projected. The mold release resistance when separating from the side surface part 52 including the part 57 is further reduced. Therefore, the protrusion part due to the release resistance
The damage around 57 can be prevented more reliably.

The present invention is not limited to the above embodiment, but various modifications can be made. For example,
The present invention can be applied not only to the lid side case member of the CD storage case as in the above embodiment but also to various case members.

[0030]

According to the first aspect of the present invention, there is provided a mold device for molding a case member, which has a projecting piece projecting in a manner that a side surface part extends and a bearing hole is provided in the projecting piece part. When opening, the second mold member that forms the outer surface of the side surface portion forms the bearing hole before the second mold member separates from the side surface portion.
Since the mold member is pulled out from the bearing hole, the release resistance of the projecting piece is reduced, and therefore, the base of the projecting piece can be prevented from being cracked or otherwise damaged.

Further, according to the second aspect of the present invention, the second mold member is driven by the angular pin provided on the first mold member forming the outer surface of the main surface portion, and further, this angular mold member is driven. A gap is formed between the regular pin and the peripheral surface of the inclined hole of the second mold member on the side of the first mold member when the mold is closed, while the third mold member is formed of a spring by the second mold member. The mold member is urged in a direction away from the case member, and when the mold is closed, it is pressed by the locking block provided integrally with the first mold member. The structure for actuating the mold member and the third mold member with a time difference is simple, and restrictions on the arrangement of the mold members can be reduced.

[Brief description of drawings]

1A and 1B are cross-sectional views of a mold device for molding a case member according to an embodiment of the present invention when a mold is closed, in which FIG. It is a b cross section.

2 is a cross-sectional view of the first stage when the mold is opened, FIG. 2A is a cross-sectional view taken along the line aa of FIG. 4, and FIG. 2B is a cross-sectional view taken along the line bb of FIG.

FIG. 3 is a sectional view showing a state in which the mold opening is further advanced,
4A is a cross section taken along the line aa in FIG. 4, and FIG. 4B is a cross section taken along the line bb in FIG.

FIG. 4 is a bottom view of a case member formed by the same as above.

FIG. 5 is a perspective view of a CD storage case using the case member.

FIG. 6 is an enlarged perspective view of the vicinity of the same protruding piece.

7A and 7B show an example of a conventional mold device for molding a case member, wherein FIG. 7A shows the mold closed and FIG. 7B shows the mold opened.

FIG. 8 is an enlarged perspective view around a projecting piece portion of the case member formed by the same as above.

[Explanation of symbols]

 32 Lid side case member (case member) 51 Main surface portion 52 Side surface portion 57 Projecting piece portion 59 Bearing hole 71 Fixed mold (first mold member) 74 Second slide core (second mold member) 75 Third Slide core (third mold member) 81 Angular pin 82 Inclined hole 86 Gap 91 Spring 95 Locking block X Second direction Z First direction

Claims (2)

[Claims] 1. A case having a main surface portion, a side surface portion bent from a side edge of the main surface portion, and a projecting piece portion protruding in a form in which the side surface portion extends, and having a bearing hole in the projecting piece portion. In a mold apparatus for molding a member, a first mold member that forms an outer surface of the main surface portion and moves in a first direction intersecting with the main surface portion, and an outer surface of the side surface portion is formed along the main surface portion. A second mold member that moves in a second direction intersecting with the side surface portion, and a third mold member that forms the bearing hole and moves in the second direction with respect to the second mold member. A third mold member drive mechanism for moving the second mold member in a direction away from the case member when the mold is opened, and the third mold member is used as the second mold member when the mold is opened. A third mold member driving mechanism for moving the mold member in a direction away from the case member in advance. Mold device for molding case members. 2. The second mold member driving mechanism is integrally provided on the first mold member, and has an angular pin having a directionality different from the first direction and the second direction, and A second mold member and an inclined hole into which the angular pin is inserted in parallel in a state where a gap is formed on the side of the first mold member when the mold is closed; and the third mold member, The second mold member is slidably supported in the second direction, and the third mold member drive mechanism causes the third mold member to be a case member with respect to the second mold member. From a spring for urging the third mold member in a direction opposite to the urging direction of the spring when the mold is closed and provided integrally with the first mold member. The mold device for molding a case member according to claim 1, wherein: