JP3205974B2 - Mold for molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding die, and more particularly, to a slide core which also serves as a protrusion mechanism.

[0002]

2. Description of the Related Art FIG. 8 shows a mini disc 1 which is a kind of recording disc and a storage case 2 for the mini disc. The storage case 2 is a flat rectangular container having an elongated one-sided opening, and the mini-disc 1 is removably stored through the opening 3. The storage case 2 has a base 6 made of an opaque resin and a cover 7 made of a transparent resin. This cover 7
As shown in detail in FIG. 9, the side plates 6b, 6c, and 6d rise substantially vertically from three sides of the main plate 6a.
On the inner surfaces of the side plates 6b, 6c, 6d, cover insertion grooves 11, 12, 13 for fixing the cover 7 are formed along the main plate 6a. In particular, locking recesses 14 are formed in the recessed grooves 12, 13 of the left and right side plate portions 6c, 6d to prevent the cover 7 from coming off at the opening 3 side. The base 6 and the cover 7 face the opening 3 and are formed with concave portions 15 and 16 for picking up the stored mini disc 1. Reference numeral 17 denotes a reinforcing rib, and reference numeral 18 denotes a mounting portion of a component for fixing and holding the mini disc 1 in the storage case 2.

[0003] The base 6 is an integrally molded product of synthetic resin. In molding, the opening and closing directions of the fixed mold and the movable mold are set in a direction orthogonal to the main plate 6 a of the base 6. Therefore, the concave grooves 11, 12, 13 are undercut in the opening / closing direction. As shown in FIGS. 10 and 11, the undercut amount “a” of the deep groove 11 is 0.75 mm, and the undercut amount “b” of the left and right grooves 12, 13 is 1.15 mm.
a <b. Therefore, the base 6 is formed using a mold having a slide core.

Here, an example of a conventional mold for molding the base 6 will be described with reference to FIGS. In the following description, the vertical direction shown in FIG. In FIG. 12, 21 is a fixed type,
Reference numeral 22 denotes a movable die, and the fixed die 21 and the movable die 22 move vertically and open and close.
A plurality of cavities 23 having the following shape are formed inside. The fixed mold 21 has a fixed mold plate 27 fixed to the lower surface of a fixed mount plate 26 attached to a fixed platen of an injection molding machine (not shown).
A cavity insert 28 embedded in 27 is fixed. These cavity inserts 28 form the outer surface side of the base 6. On the other hand, in the movable die 22, a receiving plate 33 is fixed via a spacer block 32 to an upper surface of a movable mounting plate 31 mounted on a movable platen of an injection molding machine. On the upper surface of the receiving plate 33, a movable mold plate 34 is fixed, and a core insert 35 embedded in the movable mold plate 34 is provided.
Has been fixed. These core inserts 35 form the inner surface side of the base 6, and include a center core 35a and a plurality of side cores 35b. A guide pin 36 is fixed to the fixed die 21 so as to protrude toward the movable die 22. On the other hand, a guide pin bush 37 into which the guide pin 36 is slidably inserted is fixed to the movable mold 22. Further, a sprue bush 38 to which a nozzle of an injection molding machine is connected is fixed to the fixed die 21 in a penetrating state. A locate ring 39 is fixed to the upper surface of the fixed side mounting plate 26 so as to surround the sprue bush 38. The inside of the sprue bush 38 forms a sprue 40, and the sprue 40 is open to a parting line plane PL between the fixed mold 21 and the movable mold 22. A runner 41 branched from the sprue 40 is formed on the movable mold plate 34 and the core insert 35 so as to face the parting line plane PL. And these runners 41
Are connected to the cavities 23 via the tunnel gates 42 formed in the cavity inserts 28, respectively.

Further, between the movable mounting plate 31 and the receiving plate 33 in the spacer block 32, protruding plates 46 and 47 are vertically movably supported. These protruding plates 46, 47
Is raised by the pushing rod receiver 48 fixed to the lower surface thereof being pushed by the ejecting rod of the injection molding machine. A return pin 49 fixed to the protruding plates 46 and 47 slidably penetrates the receiving plate 33 and the movable mold plate 34. Further, the protruding plates 46 and 47 are urged downward by a return spring 50 wound around a return pin 49 located between the receiving plate 33 and the protruding plate 46. On the other hand, a return pin receiver 51 that abuts on the return pin 49 is fixed to the fixed mold 21. A projecting pin 52 fixed to the projecting plates 46 and 47 slidably penetrates the receiving plate 33 and the movable mold plate 34. The protruding pin 52 has a distal end facing the sprue 40.

Further, as shown in FIG. 16, four slide cores are provided for one cavity 23 in the movable mold 22.
56, 57, 58, 59 are provided. First slide core
Reference numeral 56 denotes an undercut near the opening 3 of the base 6. The second slide core 57, the third slide core 58, and the fourth slide core 59 form undercut shapes of the concave grooves 11, 12, and 13 of the base 6, respectively. Then, the first slide core 56 is attached to the side plate portion of the base 6 with respect to the movable mold plate 34 and the core insert 35.
It moves in a direction perpendicular to 6a, and is urged against the core insert 35 by a spring 60 in a direction away from the cavity 23. Further, a stopper 61 for stopping the first slide core 56 against the bias of the spring 60 is fixed to the movable side mold plate 34. An inclined surface 62 is formed on the back surface of the first slide core 56 at an obtuse angle on the cavity 23 side with respect to the opening and closing direction of the fixed mold 21 and the movable mold 22. On the other hand, the first slide core is
A locking block 64 having an inclined surface 63 in contact with the 56 inclined surfaces 62 is fixed. Also, the second slide core
57, third slide core 58 and fourth slide core 59
Are through holes 66 formed through the core insert 35, respectively.
It is slidably fitted to 67 and 68. These through holes 66,
67 and 68 are cavities in the opening / closing direction, respectively.
Although it is inclined by 6 ° in a direction forming an obtuse angle at the center side of 23, it is located on a plane orthogonal to both the corresponding side plate portions 6b, 6c, 6d and the main plate portion 6a of the base 6. On the other hand, joint rods 69, 70, 71 corresponding to the slide cores 57, 58, 59 are fixed to the protruding plates 46, 47, respectively. At the tip of these joint rods 69, 70, 71,
Through the holders 72, 73, 74, the slide cores 57, 5
8,59 are connected. The holders 72, 73, 74 have a length in which connecting pins 75, 76, 77 fixed to the joint rods 69, 70, 71 are formed on the holders 72, 73, 74. By being inserted through the holes 78, 79, 80, the slide cores 57,
It is possible to move in the same direction as the horizontal movement direction of 58 and 59. Also, each of the holders 72, 73, 74 has a pin 81,
It is fixed to the slide cores 57, 58, 59 by 82, 83. Note that slide bearings 84, 85, 86 are provided between the joint rods 69, 70, 71 and the receiving plate 33.

Next, the operation of the above configuration will be described. 12 and 13 show the mold closed state. When the mold is closed, the fixed side mold plate 27 and cavity insert
28, the movable mold plate 34 and the core insert 35 abut, and the fixed cavity insert 28 and the locking block 64 abut the first slide core 56. The protruding plates 46 and 47 are closest to the movable-side mounting plate 31, and the second slide core 57, the third slide core 58, and the fourth slide core 59 are positioned with respect to the center of the cavity 23. It is located on the outermost side. Then, the cavity insert 28, the core insert 35, and the slide cores 56, 57, 5
A cavity 23 having the shape of the base 6 is formed between the cavity 23 and the grooves 8 and 59. In such a mold closed state, the molten resin injected from the nozzle of the injection molding machine flows into the cavity 23 from the gate 42 through the sprue 40 and the runner 41 and is filled.

After the resin filled in the cavity 23 is sufficiently cooled and solidified, the mold is opened. When the mold is opened, as the fixed mold 21 and the movable mold 22 separate from each other, the base 6, which is a resin solidified in the cavity 23, first separates from the fixed mold 21 and stops on the movable mold 22 for a while. The same applies to the resin solidified in the sprue 40 and the runner 41. With this,
As the fixed mold 21 and the movable mold 22 separate, the spring 60
Is regulated by the inclined surfaces 62 and 63,
The first slide core 56 moves. The first slide core 56 moves until it comes into contact with the stopper 61, and comes out of the opening 3 of the base 6. Thereafter, the locking block 64 of the fixed mold 21 is separated from the first slide core 56. Also, after the mold has been opened to some extent, the ejection rod of the injection molding machine pushes the ejection plates 46 and 47. As a result, as shown in FIGS. 14 and 15, the joint rods 69, 70, 71 are raised in the figure, and the second slide core 5 connected to the joint rods 69, 70, 71 is moved.
7. Third slide core 58 and fourth slide core 59
Also rises. As a result, the base 6 protrudes and separates from the core insert 35. At the same time, slide core 57,
58 and 59 slide in the inclined through holes 66, 67 and 68,
With the rise, the core insert 35 moves toward the center of the main plate 6a of the base 6 with respect to the core insert 35, and the grooves 11, 12,
Exit from 13 respectively. The slide cores 57, 58, 59
Is 2 mm in the horizontal direction. In this state, the base 6 is taken out without being hindered by the slide cores 56, 57, 58, 59. In FIG. 9, the positions of the slide cores 56, 57, 58, and 59 with respect to the base 6 are indicated by dashed lines, and the direction of movement with respect to the base 6 when the mold is opened is indicated by dashed arrows. The resin solidified in the sprue 40 and the runner 41 is protruded from the movable mold 22 by the protruding pins 52.

Thereafter, the mold is closed again and molding is repeated, but with the closing of the mold, the locking block 64 of the fixed mold 21 is closed.
Is the first slide core of the movable mold 22 via the inclined surfaces 62 and 63
By pressing 56, the first slide core 56 moves against the bias of the spring 60. Also, when the return pin receiver 51 of the fixed mold 21 presses the return pin 49,
With the bias of the return spring 50, the protruding plate
46 and 47 move toward the movable side mounting plate 31.

However, in the above-mentioned conventional mold, the molded base 6 starts to be protruded from the movable mold 22 side by the slide cores 57, 58, 59, and at the same time, the slide cores 57, 58, 59.
Is disengaged from the concave grooves 11, 12, and 13 of the base 6, so that the position of the base 6 is likely to shift while being protruded. For example, as shown in FIG. 15, if for some reason the release resistance of the right slide core 59 is greater than that of the left slide core 58, the slide core 59 moves out of the groove 13 of the base 6 with the protrusion. The base 6 does not come off and shifts to the left. Anyway, if the position of the base 6 is shifted during the protrusion, the removal of the molded product is also hindered, and the base 6 may be damaged.

As a general technique for preventing such a displacement of the molded product during the protrusion, there is a conventional technique in which a dummy protrusion pin is provided, for example. An example in which this is applied to the molding of the base 6 is shown in FIG. Protruding pin 87
Is directly fixed to the protruding plate, moves up and down straight, and has a tip part biting into the formed base 6. Then, when the mold is opened, the slide cores 58 and 59 and the ejecting pin 87 are elevated with the rise of the ejecting plate, and the molded base 6 is ejected from the movable mold 22. At this time, the slide cores 58 and 59 begin to come out of the concave grooves 12 and 13 of the base 6 at the same time as the protrusion starts, but the protrusion pins 87
Is left in the base 6. This prevents the position of the base 6 from shifting due to the horizontal movement of the slide cores 58, 59.

However, the provision of the dummy push-out pins 87, which are essentially unnecessary for the simple push-out, increases the number of parts and is disadvantageous in the production of the mold. At the same time, depending on conditions such as the shape of the molded product, it may not be possible to provide the dummy protrusion pins 87, and the protrusion pin traces may impair the appearance of the molded product.

[0013]

As described above, in a conventional mold having a slide core also serving as an ejection mechanism,
Since the molded products began to protrude from the movable mold side by the slide cores, all the slide cores came off the undercut part of the molded products. There was a problem that the removal of the molded article was hindered and the molded article was easily damaged. Further, in the conventional mold provided with a dummy ejection pin in order to prevent a displacement of a molded product during ejection, there is a problem that the number of parts increases in manufacturing the mold. In addition, depending on the shape of the molded product, it is impossible or not preferable to provide the dummy protrusion pins.

An object of the present invention is to solve such a problem. In a mold having a slide core also serving as an ejection mechanism, the slide core itself prevents the molded article from being ejected from being displaced during ejection. Aim.

[0015]

Means for Solving the Problems The present invention is intended to achieve the above object, a molding die of the first aspect of the invention, a pair of forming a cavity therein to open and close mold closing to each other physician And a plurality of slide cores movably provided on one of the molds and having an undercut surface located on the other mold side with respect to the cavity in the opening and closing direction of the two molds. A slide core drive mechanism for simultaneously moving the one mold body toward the other mold body and moving the undercut surface in a direction in which the molded article is removed from the molded product in the opening and closing direction; Of these slide cores, when the mold is opened, the slide core is moved in parallel with the opening and closing direction when the mold is opened, and the slide core with a larger release resistance is removed. It is provided with a two-stage slide core drive mechanism which causes starts to move in the direction punching at a time after starting to move to the direction.

Further, the molding die of the invention according to claim 2 is:
The two-stage slide core drive mechanism is provided on the one mold, moves in the opening and closing direction of both molds with respect to the one mold, and is movably connected to the slide core in a direction orthogonal to the opening and closing direction. And a guide provided between the one mold and the slide core, the guide including a parallel portion parallel to the opening and closing direction and an inclined portion inclined with respect to the opening and closing direction.

[0017]

In the molding die according to the first aspect of the present invention, the resin is filled into the cavity formed between the pair of molds including the slide core in the mold closed state. The slide core provided on one mold has an undercut surface located on the other mold side with respect to the cavity in the opening and closing direction of both molds, and forms an undercut portion of the molded product. After the resin filled in the cavity is solidified, the mold is opened and the molded product is taken out . When the mold is opened, the drive of the slide core drive mechanism causes all the slide cores to move simultaneously toward the other mold with respect to one of the molds, to protrude the molded article from one of the mold bodies, Direction in which each comes out of the undercut part of the molded product (drawing direction)
To move out of the undercut portion. At this time, of the plurality of slide cores, the slide core having a greater release resistance first starts to move in the pulling direction. Then, begins to move from place this release large slide core unplug movement start some time after the direction of the resistance, the direction unplug the smaller slide cores release resistance. Until then,
The slide core having a smaller release resistance moves in parallel with the opening and closing direction of the two molds, and moves in the pulling-out direction of the slide core having a higher release resistance while being fitted in the undercut portion of the molded product. This prevents the molded product from being displaced.

Furthermore, in the molding die according to the third aspect of the present invention, the two-stage slide core driving mechanism has a driving body provided on the one mold, and the driving body is the one mold. As the body moves in the opening and closing direction with respect to the body, the slide core moves with respect to the one mold body. The movement of the slide core is controlled by a guide provided between the slide core and the one mold. When the slide core is guided by a parallel portion of the guide, the slide core is integrally formed with the driving body in parallel with the opening and closing direction. Moving. Next, the slide core is guided by the inclined portion of the guide. At this time, the undercut surface also moves in the opening / closing direction in the direction perpendicular to the opening / closing direction with respect to the driving body. I do.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a molding die according to the present invention will be described with reference to FIGS. The molded product molded by the mold of the present embodiment is the base 6 of the mini-disc storage case 2 described above and shown in FIGS. Since the mold of this embodiment has the same configuration as that of the conventional mold shown in FIGS. 12 to 16 described above, the corresponding parts are denoted by the same reference numerals, and Description is omitted. Further, in the following description, reference numerals given to FIG. 12 are also cited.

The groove 1 as an undercut portion of the base 6
Three slide cores 58, 5 forming 1, 12, 13 respectively
There are 9,96. That is, these slide cores 58, 59, 9
6 each have an undercut surface 97 located on the fixed mold 21 side of the cavity 93 in the vertical direction.
Each slide core 58, 59, 96 has a core nest.
It is slidably penetrated through through holes 67, 68, 98 formed in 35, and is driven by slide core driving mechanisms 100, 101 in conjunction with the protruding plates 46, 47. As these slide core driving mechanisms 100 and 101, joint rods 69, 70 and 71 as driving bodies are fixed to protruding plates 46 and 47, just like the conventional molds. , 73, 74 through the slide cores 58, 5
9, 96 are linked. The holders 72, 73, 74 are horizontally movable with respect to the joint rods 69, 70, 71 by connecting pins 75, 76, 77 and slots 78, 79, 80. The third and fourth slide cores 5 forming the left and right concave grooves 12, 13 of the base 6 among the through holes 67, 68, 98.
The through holes 67, 68 through which the through holes 7, 58 are inclined at an angle of 6 ° with respect to the opening and closing directions of the fixed mold 21 and the movable mold 22, similarly to the conventional mold. Therefore, the third and fourth slide cores 58, 59 are simultaneously lifted,
It starts to move horizontally. On the other hand, the second slide core 96 forming the concave groove 11 at the back of the base 6 is
When the mold is opened, the two-stage slide core drive mechanism 101 moves up straight and then moves to the left in the figure while rising. The second slide core 96 moves as described above in conjunction with the vertical movement of the joint rod 69 by the guide 103 provided between the second slide core 96 and the core insert 35. As the guide 103, the right surface of the through hole 98 has an upper surface that is a parallel surface 98a as a parallel portion, and an inclined surface that is lower than the parallel surface 98a and that is inclined rightward downward. 98b. The inclination angle is 6 ° with respect to the opening and closing directions of the fixed mold 21 and the movable mold 22. The left surface of the through hole 97 has a parallel surface 9 as a parallel portion except that the upper edge is a chamfered portion 98d.
8c. The parallel surface 98c is parallel to the parallel surface 98a, and the normal direction is the left-right direction. On the other hand, the second
The upper left and right surfaces of the slide core 96 are parallel surfaces 96a and 96c as parallel portions, respectively, and the lower sides thereof are inclined surfaces 96b and 96d as inclined portions. These inclined surfaces 96b and 96d are both inclined surfaces of the through hole 98.
Parallel to 98b. Further, the parallel surfaces 96a and 96c are
Are parallel to the parallel surfaces 98a, 98c, and the parallel surfaces 96a, 96c, 98
The intervals between a and 98c are equal. Further, the vertical length of the parallel surface 96c is about 20 mm, and is equal to the length from the lower end of the parallel surface 98a to the lower end of the parallel surface 96a in the mold closed state.
At the same time, the cam groove 104 is
Are formed. The lower portion of the cam groove 104 is a parallel portion 104a extending vertically, and the upper portion is an inclined portion 104b. The inclined portion 104b is
It is parallel to b, 96d, 98b. On the other hand, on both corresponding side surfaces of the second slide core 96, driven pins 105 that slide along the cam grooves 104 are provided. When the driven pin 105 is located between the parallel portion 104a and the inclined portion 104b, the lower ends of the parallel surface 96a and the parallel surface 98a coincide with each other.

Next, the operation of the above configuration will be described. In the mold closed state, a cavity 23 is formed between the fixed mold 21 and the movable mold 22 including the slide cores 58, 59, 96 as shown in FIG. Then, the cavity 23 is filled with a molten resin. Thus, the base 6 is formed, and the slide cores 58, 59, and 96 form the concave grooves 11, 12, and 13, respectively, which are undercut portions. Then, after the resin filled in the cavity 23 is cooled and solidified, the mold is opened. With the opening of the mold, first, the base 6 as a molded product separates from the fixed mold 21. After the mold opening has progressed to some extent, the ejection rod of the injection molding machine starts pushing the ejection plate,
The joint rods 69, 70, 71 rise, and together with the joint rods 69, 70, 71, three slide cores 58, 59,
96 rises at the same time. Thereby, the formed base 6
Is protruded and separates from the movable mold 22. Slide core 5
8, 59 and 96 rise by 30 mm, during which all the third and fourth slide cores 58 and 59 move diagonally upward. Therefore, these slide cores 58, 59 start to come out of the left and right concave grooves 12, 13 of the base 6 at the same time as the protrusion starts.
On the other hand, the second slide core 96 forming the concave groove 11 having an undercut amount smaller than the two concave grooves 12 and 13 first rises straight 20 mm integrally with the joint rod 69, and then, while rising 10 mm, obliquely Move up. That is,
Initially, the parallel surfaces 96a and 96c of the second slide core 96 are sandwiched between the parallel surfaces 98a and 98c of the through hole 98, and the driven pin 105 is located at the parallel portion 104a of the cam groove 104. ,
By these guides, the second slide core 96 rises straight. Then, as shown in FIG. 3 and as shown by the broken line in FIG. 1, from the time when the lower ends of the parallel surface 96a and the parallel surface 98a coincide, one inclined surface 96b of the second slide core 96 penetrates. While hitting the inclined surface 98b of the hole 98,
The parallel surface 96c of the second slide core 96 is the parallel surface 9 of the through hole 98.
8c, and the driven pin 105 is located at the inclined portion 104b of the cam groove 104, so that the second slide core 96 is guided by the guide pin 105 as shown in FIG. As shown by, it moves to the left in the figure while ascending. Thus, each slide core 58, 59, 96 has an undercut surface
97 moves in the direction in which the fixed mold 21 and the movable mold 22 open and close, and separates from the base 6. At this time, slide core
The 58, 59, 96 move horizontally with respect to the joint rods 69, 70, 71 while rising together with the joint rods 69, 70, 71. Thus, each slide core 58, 59, 96
Are disengaged from the concave grooves 11, 12, and 13 of the base 6, respectively, so that the removal of the base 6 is not hindered.

After the base 6 is taken out, the mold is closed again and the molding is repeated. When the mold is closed, the slide cores 57, 58,
96 returns to the position at the time of closing the mold through the reverse process. At this time, in particular, the second slide core 96 is surely guided by the guide 103 including the cam groove 104.

As described above, according to the configuration of the above embodiment, when the mold is opened, the third and fourth grooves 12 and 13 having the left and right grooves 12 and 13 having a larger amount of undercut than the base 6 which is a molded product. The slide cores 58 and 59 are first removed from the grooves 12 and 13 to form a deeper groove 11 having a smaller undercut amount.
The slide core 96 is first moved straight up and withdrawn from the groove 11 with a delay, so that the displacement of the base 6 during the protrusion can be reliably prevented. That is, when the third and fourth slide cores 58, 59 having a greater release resistance are coming out of the left and right grooves 12, 13 of the base 6, that is, when the base 6 is more likely to be displaced, The position of the base 6 is fixed by the second slide core 96 having a small release resistance being fitted in the concave groove 11 at the back, and
The displacement of the base 6 from left to right is reliably prevented. Thereafter, when the second slide core 96 comes out of the concave groove 11, the base 6 is less likely to be displaced due to its smaller release resistance. In this way, the displacement of the base 6 during projection can be prevented,
The removal of the molded base 6 does not interfere, and the base 6 can be prevented from being damaged. It is also advantageous in mold production.

By the way, the deep groove 11 in the base 6
That is, if there is no undercut portion, as in the second embodiment shown in FIG.
The slide cores 58a, 58b, 59a, 59b forming the 13 are divided into two, large and small, respectively, and when the mold is opened, as shown by the arrow, the large slide cores 58a, 59a are first pulled out from the concave grooves 12, 13, and thereafter, The small slide cores 58b, 59b may be removed from the grooves 12, 13. Note that the larger slide cores 58a, 59a form most of the concave grooves 12, 13, and the other slide cores 58b, 59b may be very small. In this way, the slide cores 58a, 58b, 59a, 59b are divided, and a time difference is provided between the slide cores 58a, 58b, 59a, 59b. The slide cores 58b and 59b having a small mold resistance prevent the base 6 from being displaced.

The slide cores 58a, 59a on the rear side of the base 6 may be made larger as shown in FIG. 5, but as in the third embodiment shown in FIG. , 59c
May be made smaller and the opposite slide cores 58d, 59d may be made larger. In any case, the larger slide cores 58a, 59a, 58d, 59d are pulled out first.

FIG. 7 shows a fourth embodiment of the present invention. The base 6 which is the molded product of the previous embodiment has the concave grooves 11, 12 and 13 which are the undercut portions on the inside, but the molded product 111 of the present embodiment has the undercut portion on the outside. It has a certain concave groove 112. Therefore,
When the mold is opened, the slide core 96 with respect to the center of the cavity 113
Is opposite to that of the previous embodiment. The structure of the two-stage slide core drive mechanism 101 is the same as that of the above embodiment.
In FIG. 7, a solid line indicates a state in which the mold is closed, a broken line indicates a state in which the slide core 96 has completely risen straight with respect to the movable mold 92, and a chain line indicates a state in which the slide core 96 has further risen and moved laterally. I have.

The present invention is not limited to the above embodiments, and various modifications can be made. For example, the slide core may be driven by a dedicated hydraulic cylinder or the like in addition to being linked with the protruding plate as in the above embodiment.

[0028]

Effects of the Invention According to the present invention, among a plurality of slide cores protruding formed molded product simultaneously moving a large slide core more release resistance to drawing direction to exit the undercut portion of the previously molded article Starting to move, after a certain time thereafter, the slide core with a lower release resistance starts to move in the pulling direction, so when the slide core with a higher release resistance is coming off from the undercut portion of the molded product, that is, When the positional deviation of the molded product is more likely to occur, the positional deviation of the molded product can be reliably prevented by the slide core having a smaller release resistance. Therefore,
The removal of the molded product does not hinder the removal of the molded product.
Don't fumble.

The above-described two-stage slide core driving mechanism is provided, for example, in the second aspect of the present invention, and is provided on one of the molds so as to move in the opening / closing direction of the two molds and slide the same. A driving body movably connected to the core in a direction orthogonal to the opening / closing direction, a parallel portion provided between the one mold body and the slide core and parallel to the opening / closing direction, and an inclined portion inclined with respect to the opening / closing direction And a guide having a simple and reliable structure.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a molding die of the present invention.
(A) is a sectional view, and (b) is an explanatory plan view showing a sectional position thereof.

FIG. 2 is a cross-sectional view of the vicinity of a second slide core in the same mold closed state.

FIG. 3 is a cross-sectional view of the vicinity of a second slide core in the protruding state.

FIG. 4 is a cross-sectional view showing a state where the second slide core has come off;

FIG. 5 is an explanatory plan view showing a second embodiment of the molding die of the present invention.

FIG. 6 is an explanatory plan view showing a third embodiment of the molding die of the present invention.

FIG. 7 is a sectional view showing a fourth embodiment of the molding die according to the present invention.

FIG. 8 is a perspective view of a mini disk and its storage case.

FIG. 9 is a perspective view of a base of the storage case.

FIG. 10 is a sectional view of a portion A in FIG.

FIG. 11 is a sectional view of a portion B in FIG. 9;

FIG. 12 is an overall sectional view showing an example of a conventional molding die.

FIG. 13 is a cross-sectional view of the vicinity of the cavity in the same mold closed state.

FIG. 14 is a cross-sectional view of the same protruding state.

FIG. 15 is a cross-sectional view of the same protruding state, the cross section being orthogonal to the cross section of FIG. 14;

FIG. 16 is a plan view showing the vicinity of a movable core insert of the movable type.

FIG. 17 is a cross-sectional view showing another example of a conventional molding die.

[Explanation of symbols]

 6 Base (molded product) 21 Fixed type 22 Movable type 23 Cavity 58 Slide core 58a Slide core 58b Slide core 58c Slide core 58d Slide core 59 Slide core 59a Slide core 59b Slide core 59c Slide core 59d Slide core 96 Slide core 96a, 96c Parallel surface (parallel portion) 96b, 96d Inclined surface (inclined portion) 97 Undercut surface 98a, 98c Parallel surface (parallel portion) 98b Inclined surface (inclined portion) 100 Slide core drive mechanism 101 Two-stage slide core drive mechanism 103 Guide 104a Parallel part 104b Inclined part 111 Molded product 113 Cavity

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 33/44-33/54 B29C 45/26-45/37 B29C 45/44

Claims (2)

(57) [Claims] 1. A pair of molds which are mutually opened and closed to form a cavity therein when the mold is closed, and which are movably provided in one mold and are located on the other mold side with respect to the cavity in the opening and closing direction of both molds. A plurality of slide cores having an undercut surface, and when the molds are opened, these slide cores are simultaneously moved toward the other mold relative to the one mold, and the undercut surface is moved from the molded product in the opening and closing direction. A slide core drive mechanism for moving in the pulling-out direction to be disengaged, and among these slide cores, for the slide core having a smaller release resistance, the mold is opened and the slide core is moved in parallel with the opening and closing direction, A two-stage slide core drive mechanism is provided to start moving in the pulling direction after a while after the slide core having a greater release resistance starts moving in the pulling direction. A molding die, characterized in that: 2. The two-stage slide core drive mechanism is provided on the one mold and moves in the opening / closing direction of both molds with respect to the one mold, and moves the slide core in a direction perpendicular to the opening / closing direction. And a guide provided between the one mold and the slide core, the guide including a parallel portion parallel to the opening and closing direction and an inclined portion inclined with respect to the opening and closing direction. claim 1 Symbol placement mold of the.