JPH10309734A - Injection mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection mold with the capability of molding molded items having undercut portions by an easy and inexpensive method without any limitation in configurations of molded items. SOLUTION: The injection mold is to mold an item 18 molded having an undercut portion within a cavity 27, and it includes a stripper plate 6 adapted to allow the molded item 18 to be released from a stationary mold plate 5 for forming the cavity 27, and a rotation core 12 that is rotatably secured on the stripper plate 6, forms the undercut portion of the molded item 18, and rotates on the stripper plate 6 along with the molded item 18 after mold release.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold for forming a molded article having an undercut.

[0002]

2. Description of the Related Art Conventionally, as an injection mold for molding a molded product having a concave undercut portion on the surface,
There is one disclosed in Japanese Patent Application Laid-Open No. 5-124045. The molded product 49 having the undercut portion has, for example, a shape as shown in a perspective view in FIG. It has an L surface (parting line surface) and has an undercut portion 50 on its upper surface side.

As shown in FIG. 9, the injection molding die for molding the molded product 49 has a movable mold 51 and a fixed mold 52 opposed to each other. Part 5
1 and the fixed mold part 52 are clamped to form the cavity 5.
Form 3 The cavity 53 contains The runner 53a and the gate 53b communicate along the L plane. A rotating shaft 56 rotatably supported by a rotating shaft fixing base 55 fixed to the movable mold portion 51 with a fixing screw 54 is provided on the movable mold portion 51 side near the cavity 53. The base end of the embedded pin 57 is attached to 56. Since the rotation shaft 56 extends in a direction orthogonal to the plane of the drawing, the movement of the embedding pin 57 is performed in the direction of the drawing. On the other hand, the tip of the embedding pin 57 extends toward the undercut-equivalent portion 58 of the cavity 53. When the molded product 49 is released from the movable mold portion 51 after the movable mold portion 51 and the fixed mold portion 52 are opened, the embedded pin 57 formed with the undercut portion 50 of the molded product 49 is formed. An ejector pin 59 for protruding the molded product 49 while rotating is provided slidably in the movable mold part 51.

[0004] Next, the operation for releasing the molded product from the mold will be described. First, the resin is poured into the cavity 53 after the embedding pin 57 is positioned at a predetermined position in the mold clamping state,
The resin is solidified to obtain a molded product 49 having a concave undercut portion 50. Thereafter, the movable mold 51 to which the molded article 49 is attached is moved in the mold opening direction a, and is separated from the fixed mold 52. Movable mold part 5
The ejector pins 59 in 1 are protruded toward the molded product, and the molded product 49 is released from the movable mold 51. In accordance with the movement of the molded product 49 at the time of releasing the mold, the tip of the embedding pin 57 rotates about the rotary shaft 54, and the molded product 4
9 escapes from the undercut portion 50.

[0005]

However, as described above, the operation of releasing the molded product 49 from the movable mold portion 51 and the operation of releasing the embedded pin 57 from the undercut portion 50 of the molded product 49 are described. Is performed at the same time, the molded product 49 is limited to a shape that allows the embedding pin 57 to rotate around the rotation shaft 56 provided on the movable-side mold portion 51 and escape from the undercut portion 50 of the molded product 49. Had the problem of being done. Therefore, for example, when molding the molded product 49 in which the undercut portion 50 is long (or deep), the embedding pin 57 cannot come out of the undercut portion 50, and the undercut portion 50 having a good shape can be removed. Molded product 49 was not obtained.

The present invention has been made in view of the above-mentioned problems of the prior art, and a first object is to provide an undercut portion by an easy and inexpensive method without being limited to the shape of a molded product. An object of the present invention is to provide an injection mold capable of molding a molded product. The second and third objectives are:
An object of the present invention is to provide an injection mold capable of molding a molded article having an undercut portion by an easy and inexpensive method without being limited to the shape and weight of the molded article.

[0007]

In order to achieve the above object, an injection molding die according to a first aspect of the present invention is an injection molding die for molding a molded product having an undercut portion in a cavity. A stripper plate for releasing the mold from the mold plate forming the cavity, and rotatably mounted on the stripper plate, forming an undercut portion of the molded product, and forming the undercut portion on the stripper plate together with the molded product after the release. It has a rotating insert that rotates.

[0008] The injection mold according to the second invention comprises:
In the injection molding die according to the first invention, in order to rotate the rotary insert, the rotary insert or the molded product is in a state where the rotary insert and the molded product are in close contact with each other. And a pusher pin for pressing a part of the stripper plate is provided in the stripper plate.

Further, according to a third aspect of the present invention, there is provided the injection molding die according to the first or second aspect of the invention, wherein the rotary insert is rotated to rotate the rotary insert. A rotary nesting link for connecting the mold plates forming the cavity is provided.

That is, in the injection molding die according to the first invention, after the rotary insert is released from the core portion of the mold plate forming the cavity together with the molded product by the stripper plate,
The rotating insert is rotated together with the molded product on the stripper plate.

Further, the injection mold according to the second invention is
By pushing a part of the molded product with the pusher pin in the direction in which the molded product is released, the rotary insert closely contacting the molded product can be easily moved.

Further, in the injection molding die according to the third aspect of the present invention, the rotating insert link generates an action of moving the rotary insert together with the molded product by the force of the movement of the stripper plate. The child is easily turned.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 2 show an injection mold according to the present embodiment. FIG. 1 is a sectional view showing a state immediately after the mold is opened, and FIG. 2 is a sectional view showing a state when the mold is closed. 3 and 4 show a part of the injection mold according to the present embodiment. FIG. 3 is a perspective view showing a rotary insert.
FIG. 4 is a cross-sectional view showing when the molded product is taken out.

As shown in FIG. 1, the injection mold according to the present embodiment is mounted between a fixed platen and a movable platen of a horizontal injection molding machine (not shown). The mold opening direction a of the movable mold 21 and the mold clamping direction b of the movable mold 21
Is horizontal.

In FIGS. 1 and 2, a support pin 3 extending toward a movable mold 21 is mounted and supported on a fixed mold mounting plate 2 of a fixed mold 1 attached to a fixed platen of an injection molding machine. The support pin 3 has guide holes 4 a, 5 a, 5 a, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 5 b, 6 b, 5 b, 5 b, 5 b, 5 b. It is slidably supported via 6a. Each guide hole 4a, 5a, 6a may be provided with a bearing bush interposed.

The fixed mold plate 5 is provided with a core portion 5b which forms a part of a molded product at a central portion of the mold plate 5 so as to protrude toward the stripper plate 6. On the other hand, the stripper plate 6 is provided with an engagement hole portion 6b for fitting with the core portion 5b at a central portion of the stripper plate 6, so that when the injection mold is closed, the engagement hole portion 6b is formed. The base portion 5c of the core portion 5b is fitted so as to form a part of the cavity. Base end portion 5 of core portion 5b
c and the engagement hole portion 6b of the stripper plate 6 fit into the gap between the base end portion 5c of the core portion 5b and the engagement hole portion 6b of the stripper plate 6 when fitting, that is, when closing the mold of the injection molding die. And the stripper plate 6 is separated from the core portion 5b by the mold opening operation of the molding machine.

The runner stripper 4 includes a movable mold 2.
A plastic bolt 7 extending to one side is fixed by a stop bolt 8. The plastic bolt 7 is slidably inserted into the fixed mold plate 5 through a hole 5 d provided in the fixed mold plate 5, and the plastic bolt 7 located on the stripper plate 6 side.
Is fixed to the fixed template 5 so that the amount of mold opening between the fixed template 5 and the runner stripper 4 is limited. The stop bolt 8 is provided with a head 8a movably housed in a counterbore-shaped hole 2a drilled in the fixed mold mounting plate 2 from a fixed platen (not shown) side of the injection molding machine, and a counterbore-shaped hole 2a. It is formed in the shape of a shoulder bolt comprising a shaft portion 8b that can be inserted into a hole provided at the bottom of the stop bolt, and a screw portion projecting from the shaft portion 8b is provided at the center of the stop bolt 8. This screw portion can be screwed into the screw portion of the plastic bolt 7 by passing through the runner stripper 4, and the screwing clamps the runner stripper 4 between the shoulder portion of the shaft portion 8 b and the end face of the plastic bolt 7. 7 and the runner stripper 4 are fastened. Head 8 of stop bolt 8
a can be locked to the bottom of the counterbore-shaped hole 2a, and the opening amount of the runner stripper 4 is limited by the length of the shaft portion 8b of the stop bolt. The length of the shaft portion 8b of the stop bolt 8 is set so that the head 8a of the stop bolt 8 does not protrude from the fixed mounting plate 3 when the runner stripper 4 and the fixed mounting plate 2 come into contact with each other at the time of mold clamping. (In FIG. 2, the head 8a and the fixed type mounting plate 3 are located on the same plane.) That is, the distance between the bottom of the counterbore-shaped hole 2a drilled in the fixed type mounting plate 2 and the head 8a of the stop bolt 8 is defined as the mold opening amount between the runner stripper 4 and the fixed type mounting plate 2 as a runner stripper. 4 can move in the mold opening direction a.

The stripper plate 6 has a hole 6c through which the plastic bolt 7 can be inserted. A link 9 extending toward the movable mold 21 is fixed to a side wall of the stripper plate 6 with a bolt 10. This link 9
A groove 9a is formed in the movable die 21 so as to regulate the amount of opening between the stripper plate 6 and the movable die plate 21 while being guided by bolts 23 implanted in the movable die plate 22 of the movable die 21. A permanent magnet 11 and a permanent magnet 11a are embedded on each side of the fixed mold plate 5 and the stripper plate 6 in contact with each other.
It can be maintained in the attracted state by the magnetic force of a. Therefore, the movable mold 21 moves in the mold opening direction a by the mold opening operation of the molding machine, and the bolt 2 implanted in the movable mold plate 22 is moved.
Until the link 3 and the link 9 are locked and the link 9 is pulled by the movable template 22 and the head of the plastic bolt 7 is locked to the fixed template 5, the link 9 is fixed to the fixed template 5 and the stripper. The fixed mold plate 5 and the stripper plate 6 are moved together in the mold opening direction a by the magnetic force between the magnets 11 and 11a embedded in the plate 6. The mold opening amount of the molding machine is adjusted in advance to a distance at which the stripper plate 6 can be supported by the long support pins 3.

In order to form a molded product 18 having a substantially truncated pyramid-shaped bottom and an opening serving as an undercut 18a in the side wall, an undercut portion 12a for forming an opening in the side wall serving as a forming surface is provided. The rotating insert 12 is connected to the stripper plate 6 via a rotating shaft 13 shown in FIG.
It is rotatable around a rotation shaft 13. The turning shaft 13 is provided below the turning insert 12 so that the turning insert 12 can turn in the direction of action of gravity. The position of the rotation shaft 13 is determined so that the rotation insert 12 or the molded product 18 does not contact the stripper plate 6 when the rotation insert 12 rotates. As shown in FIG. 3, both ends of a rotating shaft 13 that rotatably supports the rotating insert 12 are supported by a substantially four-part cylindrical bearing member 14 fixed on a pair on the stripper plate 6. Each of the bearing members 14 is provided with a corresponding one of the concave portions 12 b
Is housed inside. Further, permanent magnets 15 and 16 are buried in a part of each joint surface between the rotating insert 12 and the stripper plate 6. This permanent magnet 1
5 and 16 are the rotating inserts 1 with respect to the stripper plate 6.
2 has a magnetic force to attract and hold the rotating insert 12, but when a molded product 18 adheres to the rotating insert 12, the rotating shaft 13 rotates around the rotating shaft 13 against the attracting and holding force. The rotation insert 12 rotates. The operation of returning the rotary insert 12 to the suction holding state with respect to the stripper plate 6 is performed by operating a robot hand (not shown). Then, with the injection mold closed, the core 5
b, upper surface of stripper plate 6, rotating insert 1
2, the forming surface of the undercut portion 12a, the movable mold plate 22
The cavity 27 (see FIG. 2) is formed by the concave surface 22b formed in the above.

The fixed type mounting plate 2, the support pins 3, the runner stripper 4, the fixed type plate 5, the stripper plate 6,
The fixed mold 1 is constituted by the plastic bolt 7, the stop bolt 8, the rotating insert 12, the rotating shaft 13, and the like. Note that a locate ring 19 is mounted on the fixed mounting plate 2.

A resin flow path 20 (shown by a dotted line in the figure) formed of a sprue runner gate communicating with the cavity 27 is formed inside the fixed mold mounting plate 2, the runner stripper 4, and the fixed mold plate 5. The resin from the nozzle of the molding machine (not shown) is supplied to the cavity 27 by the resin flow path 20.
It can be filled inside.

The fixed mold plate 5 and the movable mold plate 22 are provided with a temperature control hole (not shown) through which a medium such as water or oil can pass for temperature adjustment, so that the mold temperature can be adjusted. it can.

The movable mold plate 22, the movable mold mounting plate 24, the spacer block 25, and the movable receiving plate 26 are respectively fastened by bolts or the like to form the movable mold 21. The movable die 21 has holes 22a for accommodating or passing the support pin 3 or the plastic bolt 7 at the position corresponding to the support pin 3 and the position corresponding to the plastic bolt 7 in parallel with the mold opening direction a at the time of mold clamping. ,
24a and 25a are formed, and the movable mold plate 22 is formed.
Is formed with a storage portion 22c for the rotary insert 12.

Here, for convenience, the space in the injection molding die when the mold is opened is represented by A, the movable mold plate 22 and the stripper plate 6 are designated by A, and the stripper plate 6 and the fixed mold plate are designated by A in FIG. 5 is B, the fixed template 5 and the runner stripper 4 are C, and the runner stripper 4 and the fixed template 2 are D
And The direction of rotation of the rotating insert 12 and the molded product 18 is represented by an arc-shaped arrow E.

Next, a method of molding an injection-molded article with the above-described injection mold will be described together with its operation. As shown in FIG. 2, in a state where the fixed mold 1 and the movable mold 21 are in contact with each other, in a so-called closed state of an injection mold, a molten resin is fitted to the locate ring 19 by a nozzle of a molding machine (not shown). Is supplied into the cavity 27 through the resin flow path 20 and the resin is solidified in the cavity 27 to form the molded product 18.
Get.

Next, as shown in FIG. 1, the movable mold 21 is moved in the mold opening direction a to separate the movable mold 21 from the fixed mold 1 so-called mold opening. The movable mold 21 moves in the mold opening direction a by the mold opening operation of the molding machine. At this time, the bolt 23 implanted in the movable mold plate 22 moves in the groove 9 a of the link 9 to form a space A where the molded product 18 can be taken out between the movable mold plate 22 and the stripper plate 6. The bolt 23 is locked in the groove 9a and pulls the link 9, so that the stripper plate 6 and the fixed mold plate 5 are separated by the permanent magnets 11a and 11 while the space A is separated from the movable mold plate 22. It is moved integrally in the mold opening direction a while being sucked. Then, between the fixed mold plate 5 and the run stripper 4, the sprue solidified in the resin flow path 20 composed of a sprue runner gate is formed.
This creates a space C from which the runner gate 20a can be taken out by a method such as dropping. At this point,
The runner / gate 20a is held by the runner stripper 4 and the fixed mounting plate 2, and the molded product 18 and the sprue / runner / gate 20a are separated. Thereafter, the fixed mold plate 5 is engaged with the head of the plastic bolt 7 to limit the amount of movement of the mold opening. The runner stripper 4 uses the force generated when the fixed mold plate 5 hits the head of the plastic bolt 7 to move the head 8 of the stop bolt 8.
The sprue part is integrated with the resin at the tip of the nozzle of the molding machine (not shown) by moving a distance until the a strikes the bottom of the counterbore-shaped hole 2a formed in the fixed die mounting plate 2 to form a space D. And separate the stop bolt 8
Of the sprue / runner / gate 20 from the runner stripper 4 by the impact force of which the head 8a is locked by the fixed type mounting plate 2.
a, and the sprue / runner / gate 20a is dropped by the space C.

After the fixed mold plate 5 is restricted in the amount of movement of the mold opening by the head of the plastic bolt 7, the mold opening is continued, and the stripper plate 6 is pulled through the link 9 in the mold opening direction a. As a result, a force greater than the magnetic attraction of the permanent magnets 11a and 11 provided on the stripper plate 6 and the fixed mold plate 5 acts between the stripper plate 6 and the fixed mold plate 5, thereby separating the stripper plate 6 and the fixed mold plate 5. A space B is created between the plate 6 and the fixed template 5. By this operation, the molded product 18 is separated from the stripper plate 6 supporting a part of the molded product 18 from a state in which the molded product 18 is in close contact with the core portion 5b (see FIG. 1).

Thereafter, the mold opening operation of the molding machine is completed at a position adjusted in advance so that the stripper plate 6 can be supported by the support pins 3. By overcoming the attraction force of the permanent magnets 15 and 16 that have held the moving insert 12 and the stripper plate 6 in contact with each other, the rotary insert 12 rotates about the rotary shaft 13, and thus a circle together with the molded product 18. The rotation is performed in the direction of the arc-shaped arrow E. Then, when the rotating insert 12 has completely rotated, the take-out robot (not shown)
The molded product 18 having the undercut 18a is inserted into the rotating insert 1
2 (see FIG. 4).

Thereafter, the rotary insert 12 is reversed (in the reverse E direction) by a robot, and the permanent magnet 15 of the rotary insert 12 and the permanent magnet 16 of the stripper plate 6 attract and hold both, and then the mold is clamped. The operation is performed by the molding machine, and the movable mold 21 moves in the mold closing direction b, returning to the state where the fixed mold 1 and the movable mold 21 are in contact with each other as shown in FIG.

According to the present embodiment, the molded article 18 having the undercut 18a can be formed with a simple structure in which the rotary insert 12 is connected to the stripper plate 6.

In this embodiment, the permanent magnets 11a and 11a are respectively provided on the stripper plate 6 and the fixed mold plate 5.
Although it has been described that the magnetic force source 11 is embedded and is integrally attracted and held by magnetic force when the two are in contact with each other, the present invention is not limited to this. Function and effect can be achieved.

Also, the permanent magnets 15 and 16 are disposed on the rotating insert 12 and the stripper plate 6, respectively, so that the permanent magnets 15 and 16 are held at a predetermined time and released at a predetermined time. For example, a tension coil spring is disposed between the positions 15 and 16, and the two members are brought into contact with each other by the tension coil spring, and the rotating insert 12 having increased weight is pulled against the tension force of the spring. The same operation and effect can be obtained by extending the rotation of the rotary insert 12, and in this case, after removing the molded product 18 from the rotary insert 12, the return force of the spring The rotation insert 12 can be linked to be restored to the original position. Further, instead of the tension coil spring, a mustache spring or the like can be used as the contact state maintaining means.

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIGS. 5 and 6 are cross-sectional views showing a part of the injection mold at the fixed mold side.
6 shows a mold clamping state, and FIG. 6 shows a mold opening state.

In the injection molding die of the present embodiment, the pusher pin 30 provided in the stepped hole 6e machined in the thickness direction of the stripper plate 6 is provided on the side of the stripper plate 6 where the cavity 27 is formed. The head 30a of the pusher pin 30 is slidably supported so that the end face of the shaft 30b can protrude to a predetermined height.
Are urged by a spring 31 in the mold opening direction a. The other end of the spring 31 is fixed to a threaded portion threaded at the end of the stepped hole 6e by a screw screw plug 32 with a seat fixed by a screw. The rear end of the seated screw plug 32 is flush with the rear surface of the stripper plate 6.

The pusher pin 30 is provided above the rotatable insert 12 which is approximately symmetrical with respect to the rotatable insert 12 with the core portion 5b interposed therebetween.
As shown in FIG. 5, the pusher pin 3 is
The end surface of the shaft portion 30b that pushes out the molded product 18 of 0 is disposed at the same position as the surface of the molded product portion of the stripper plate 6.

The other structure is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and description thereof is omitted.

Hereinafter, a method of molding an injection-molded article with the injection mold having the above-described structure will be described with reference to FIGS. 2, 5 and 6. As shown in FIGS. 2 and 5, the process of supplying a resin from a molding machine (not shown) in a so-called mold-clamped state and solidifying the resin to obtain a molded product 18 is the same as in the first embodiment. At this time, the surface of the pusher pin 30 from which the molded product 18 is pushed out is pushed back by the movable mold plate 22 so as to be the same as the surface of the molded product portion of the stripper plate 6 as shown in FIG.

Thereafter, the mold opening operation is performed by the molding machine, and the steps until the molded product 18 is separated from the core portion 5b of the fixed mold plate 5 by the stripper plate 6 until it is separated are the same as those in the first embodiment. .

When the molded product 18 is separated from the core 5b, the pusher pin 30 moves in the mold opening direction a by the spring 31 biased as shown in FIG. 5, and the head 30a of the pusher pin 30 is moved by the stepped hole 6e. Move to the position where it can be stopped.

As a result, as shown in FIG. 6, the upper side of the molded product 18 is pushed by the pusher pin 30, and the rotary insert 12 provided at an approximately symmetrical position with respect to the core portion 5b is provided.
Starts rotating in the direction of arrow E shown in FIG. Subsequent steps are the same as in the first embodiment.

According to the present embodiment, the pusher pin 30 is provided inside the stripper plate 6, and the molded product 18 is pushed and rotated by the pusher pin 30. Even in the case of a molded product that cannot be moved, the rotating insert 12 can be easily rotated, and as shown in FIG.
The molded article 18 having a can be molded and taken out.

[Third Embodiment] A third embodiment of the present invention will be described with reference to FIGS. 7 and 8 are sectional views showing a part of the injection mold at the fixed mold side.
8 shows a mold clamping state, and FIG. 8 shows a mold opening state.

As shown in FIG. 7, in the injection molding die of the present embodiment, the rotary insert 12 connected to the stripper plate 6 via the rotary shaft 13 is a rotary shaft of the rotary insert 12. 13
At a further lower position than the pivoting nesting link 4
0 is also connected to the fixed mold plate 5. Rotating insert 1
2 and the rotatable nesting link 40 are rotatably connected at one end of the rotatable nesting link 40 by a rotatable rotatable shaft 40a. In addition, one end of the rotating nesting link 40 has an elongated hole 40 along the longitudinal direction of the rotating nesting link 40.
b, and is formed by inserting a shaft 40c planted on the fixed mold plate 5 into a long hole 40b located on the fixed mold plate 5 side through a hole 6d provided in the stripper plate 6. It is movably supported in the mold opening and closing directions a and b. A hole 5e is formed in the fixed mold plate 5 in the mold opening direction a so that one end of the rotary insertion link 40 can enter, and the shaft 40c is implanted in the hole 5e. When the mold shown in FIG. 7 is closed, the long hole 40b of the rotary nesting link 40 is housed. When the rotary insert 12 rotates downward (in the direction of the arrow E shown in FIG. 1) together with the molded product 18 after the mold is opened, the rotary shaft 13 is moved so as not to hinder the rotation of the rotary insert 12. A chamfered portion 12c is formed below the rotatable insert 12 and the rotatable insert 12 is formed.
Alternatively, the positions of the rotating shaft 13, the rotating shaft 40a, the elongated hole 40b, and the shaft 40c are determined so that the molded product 18 does not contact the stripper plate 6 and the rotating nesting link 40.

Other structures are the same as those of the first embodiment, and the same portions are denoted by the same reference numerals and description thereof is omitted.

Hereinafter, a method of forming an injection-molded article with the above-configured molding die will be described with reference to FIGS. FIG.
As shown in the figure, the step of supplying a resin from a molding machine (not shown) in a state where the so-called fixed mold 1 and movable mold 21 are clamped to solidify the resin to obtain a molded product 18 is the same as in the first embodiment. At this time, the shaft 40c is located near the stripper plate 6 in the elongated hole 40b.

Thereafter, the mold opening operation is performed by the molding machine, and the steps until the molded product 18 is separated from the core portion 5b of the fixed mold plate 5 by the stripper plate 6 until it is separated are the same as those in the first embodiment. .

When the molded product 18 is separated from the core portion 5b, as shown in FIG. 8, the stripper plate 6 and the fixed mold plate 5 are separated from each other, and the shaft 40c moves toward the fixed mold plate 5 in the elongated hole 40b. Then, it comes into contact with the end face of the elongated hole 40b.
Furthermore, when the stripper plate 6 moves in the mold opening direction a, the pivoting link 40 is pulled by the fixed mold plate 5 and the pivoting link 40 connected to the pivoting link 40 is thereby pulled. The child 12 rotates around a rotation shaft 13 (see FIG. 8). Subsequent steps are the same as in the first embodiment.

According to the present embodiment, there is provided a rotating nesting link 40 for connecting the rotating nesting member 12 and the fixed mold plate 5, whereby a force for moving the stripper plate 6 in the mold opening direction is provided. By using the rotary insert 12 and the molded product 18,
By rotating the rotating insert 12, it is possible to easily rotate the rotating insert 12 even in the shape of a molded product in which the rotating insert 12 cannot be rotated by the weight of the molded product 18, and the undercut 18 a The molded article 18 having the same can be molded and taken out.

The technical idea having the following configuration is derived from the above specific embodiment. (Supplementary note) (1) In an injection molding die for molding a molded article having an undercut portion in a cavity, a stripper plate for releasing the molded article from a mold plate forming the cavity, and a rotatable pivot on the stripper plate. Attached to
A rotating insert that forms an undercut portion of the molded article and rotates on the stripper plate together with the molded article after the mold release; and a stripper plate that is pivotally inserted into at least one of the stripper plate and the rotating insert. An injection mold comprising a magnet for contacting a child.

According to the injection molding die of the above (1), it is possible to mold a molded product having an undercut portion without being limited to the shape of the molded product, and to rotate when the mold is closed. The insertion can be performed in a state where the insert is adsorbed to the stripper plate.

[0051]

As described above, according to the injection molding die of the present invention according to the first aspect, the undercut portion is formed by rotating the rotating insert without being limited to the shape of the molded product. The effect which can shape | mold the molded article which has this is produced.

Further, according to the injection molding die of the present invention according to the second aspect, in addition to the effect of the first aspect, the effect that the rotary insert and the molded product can be rotated by the pusher pin without depending on the own weight. To play.

Further, according to the injection molding die of the present invention according to claim 3, in addition to the effect of claim 1, the rotary insert and the molded article are rotated by the rotary insert link without relying on their own weight. The effect that can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an injection mold according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an injection mold according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a part of the injection mold according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a part of the injection mold according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing a part of an injection mold according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a part of an injection mold according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a part of an injection mold according to a third embodiment of the present invention.

FIG. 8 is a sectional view showing a part of an injection mold according to Embodiment 3 of the present invention.

FIG. 9 is a sectional view showing a conventional injection mold.

FIG. 10 is a perspective view showing a molded product formed by a conventional injection molding die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed type 2 Fixed type mounting plate 4 Runner stripper 5 Fixed type plate 5b Core part 6 Stripper plate 7 Plastic bolt 8 Stopper bolt 11, 11a, 15, 16 Permanent magnet 12 Rotating insert 13 Rotating shaft 18 Molded product 18a Under Cut 21 Movable mold 22 Movable mold plate 27 Cavity 30 Pusher pin 31 Spring 40 Rotating nesting link

Claims (3)

[Claims] 1. An injection molding die for molding a molded product having an undercut portion in a cavity, wherein the molded product is released from a mold plate forming the cavity and a stripper plate is rotatably mounted on the stripper plate. An injection molding die, comprising: a rotating insert that is attached, forms an undercut portion of the molded product, and rotates on the stripper plate together with the molded product after the mold release. 2. A pusher pin for pushing said rotary insert or a part of said molded product in a state where said rotary insert and said molded product are in close contact with each other to rotate said rotary insert. The injection molding die according to claim 1, wherein the mold is provided in the stripper plate. 3. The device according to claim 1, further comprising: a rotatable link for connecting the rotatable insert with a template forming the cavity to rotate the rotatable insert. Alternatively, the injection mold according to claim 2.