JP2003112341A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine capable of being designed and altered in design with the high degree of freedom and suitable for molding a molded article having a complicated shape. SOLUTION: The injection molding machine has a second mold 6 on a fixed side and a block mold 7, which molds at least an undercut part having a predetermined undercut angle and is fitted in the second mold 6 in a freely detachable manner to relatively move in the direction opposite to the moving direction of the second mold 6, and a guide groove 9a is provided to a second mold 9 so as to guide the block mold 7 separated from the second mold 9 in the direction corresponding to the undercut angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus, and more particularly, to an injection molding apparatus that facilitates taking out a molded product including an undercut portion.

[0002]

2. Description of the Related Art There are various shapes of injection-molded resin products, and a mold, a mold clamping mechanism, and a mold opening mechanism are designed according to their shapes. In particular, the shape in which the tip end is thicker than the base end as viewed from the mold opening surface and / or the shape having the shape undercut part of the part makes it difficult to take out the molded product after opening the mold, and injection molding The structure of the device tends to be complicated. Explaining it concretely, in the case of a molded product in which the tip part is thicker than the base end part when viewed from the mold opening surface, the mold is moved from the thick base end part toward the thin tip part. It cannot be moved. Further, in the case of a molded product having an undercut portion having an angle along the mold opening direction at a predetermined angle, the mold cannot be moved along the mold opening direction. Here, two examples of conventional injection molding apparatuses designed for resin products having such shapes will be outlined with reference to FIGS. 15 and 16. First, FIG. 1 shown as a first conventional example.
The injection molding apparatus of No. 5 employs a mechanism for obliquely extruding the extrusion block 1001 forming a molded product. FIG. 15A shown here is a side cross-sectional explanatory view showing an example of a conventional undercut processing structure, and FIG.
(B) is the plane explanatory view. In this injection molding device, a piece mold designed according to the undercut shape is provided to perform molding and release.

Next, FIG. 16 shown as a second conventional example.
The injection molding apparatus of the movable block 1002 shown in FIG.
Uses a mechanism to move in the direction of the arrow. FIG. 16A shown here is a side cross-sectional explanatory view showing another example of the conventional undercut processing structure, and FIG. 16B is FIG.
6A is a front cross-sectional explanatory view at the position bb shown in FIG. 6A, and FIG. 16C is a plan explanatory view thereof.
In this injection molding apparatus, the movable block 1002 having a plate-like shape including the inverse portion (undercut portion) of the component p as a molded product is provided with the cam block 1003 and the T block.
The hydraulic cylinder 1 is connected by a character-shaped guide 1004.
A cam block 1003 by an actuator such as 005
The movable block 1002 moves in the direction of the arrow by moving. By the way, in the molding operation, the cam block 3 is returned before the push-out operation of the component, and the push-out operation is performed with the movable block 2 removed from the component.

[0004]

However, in the injection molding apparatus in the first conventional example, when the inverse amount of the part p of the molded product is i (see FIG. 15 (a)), the extrusion block during the extrusion operation. 1001
And the part p do not interfere with each other, the extrusion block 100
It is necessary to provide a gap of i + α between 1 and the component p. For this reason, when the width w of the component p is narrow in the shape of the component p, the portion of the extrusion block 1001 indicated by b becomes thin, resulting in insufficient strength and damage to the die. Further, when the width w of the component p is smaller, there is a problem that the mechanism of this injection molding device cannot be adopted in the first place.

Further, in the injection molding apparatus of the second conventional example, the cam block 1003 is prevented from being pushed back by the load due to the resin pressure acting on the movable block 1002.
It is necessary to select the hydraulic cylinder 1005, and particularly when the resin pressure is large, a large hydraulic cylinder corresponding to this is required. Therefore, in this injection molding apparatus, there is a problem that the mold structure is complicated and large, and that it takes time to adjust the sliding portion of the cam and the mold cost is increased. In addition, since the unit becomes large, there is a design inconvenience that the hydraulic cylinder and the like exceed the allowable external dimensions of the mold. In addition, there are many restrictions on the layout of the water holes for temperature control due to the fact that the core 1006 is provided with an operation groove for the movable block 1002, and this causes a problem that mold temperature control is likely to occur.

The present invention has been made in view of the above-mentioned problems of the prior art, and has the advantages that it has a small number of die constituting units, the apparatus itself is compact, and there are few design restrictions, but it also offers a high degree of freedom. It is an object of the present invention to provide an injection molding apparatus that can design and change the design of a molding die at any time and is suitable for molding a molded product having a complicated shape.

[0007]

(1) In order to achieve the above object, according to the invention of claim 1, a first mold,
Of the second mold that moves closer to and away from the first mold and the molded product molded by the first mold and the second mold, with respect to the moving direction of the second mold. At least an undercut portion having a predetermined undercut angle is formed, and the block die is detachably fitted into the second die and moves in a direction opposite to the moving direction of the second die. Then, the block mold is provided with an injection molding apparatus including guide means for guiding the block mold separated from the second mold in a direction according to the undercut angle. In this invention, the guide means moves along the predetermined undercut angle direction in a direction relatively opposite to the cam block guide groove provided in the block mold and the moving direction of the block mold. A cam block inserted into the cam block guide groove,
It is preferable to include a slide block guide groove provided in the block mold and a slide block sliding in the slide block guide groove along a direction substantially perpendicular to the moving direction of the mold (claim 2). Further, it is preferable that the slide block is a substantially columnar member having an axial direction that is substantially orthogonal to a direction in which the slide block guide groove is provided (claim 3). In this invention,
An undercut portion is formed, a detachable block die is provided on the second die, and a guide means for guiding the block die in a direction according to the undercut angle is provided on the block die. This block mold moves in a direction relatively opposite to the moving direction of the second mold.

The operation of the present invention will be described. First, the block mold is moved in a direction relatively opposite to the moving direction of the second mold, and is separated from the second mold. At this time, the molded product is placed in the block mold. Since the guide means guides the block mold in the direction corresponding to the undercut angle, the block mold is relatively separated from the molded product in the direction corresponding to the undercut angle, and thus the mold is released. You can get the goods.

Further, in the present invention, the guide means is specifically a block-shaped cam block guide groove, a cam block inserted in the cam block guide groove, and a slide block similarly provided in the block type. It is preferable to provide a guide groove and a slide block that slides in the slide block guide groove. In the present invention, the cam block guide groove is provided along the undercut angle direction, and the slide block guide groove is provided along a direction substantially perpendicular to the moving direction of the second die. In the present invention, the positions of the cam block guide groove and the slide guide groove are not particularly limited, and can be appropriately determined in relation to other members. Therefore, it may be provided on the side surface of the block type or inside the block side, and its position is not limited. Also,
The shape of the cam block is not particularly limited, and may be a substantially rod shape, a substantially plate shape, a substantially square shape, a substantially columnar shape, or any other shape. Further, the form of the slide block is not limited to this.
Particularly, when the slide block is formed into a substantially cylindrical member and its axial direction is set to a direction substantially orthogonal to the slide block guide groove, the workability can be improved, and especially the slide block guide groove is provided inside the block mold. Is particularly advantageous in the case of providing.

Explaining the structure of the present invention, first, similarly to the above-mentioned invention, the block mold is moved in a direction relatively opposite to the moving direction of the second mold, and is separated from the second mold. . At this time, the molded product is placed in the block mold. The cam block that moves relatively in the opposite direction to the moving direction of the block die is inserted into the cam block guide groove provided in the block die. At this time, since the cam block guide groove is provided along the undercut angle, the cam block is inserted along the cam block guide groove while moving in the direction opposite to the block type. With this insertion operation, the slide block slides along a slide block guide groove provided in a direction substantially perpendicular to the moving direction of the second die. In this way, the operation of inserting the cam block at an angle along the undercut angle direction with respect to the moving direction of the second die and the slide block in the direction substantially perpendicular to the moving direction of the second die are performed. By the sliding operation, the guide means guides the block mold in the direction corresponding to the undercut angle, so that the block mold is relatively separated from the molded product in the direction corresponding to the undercut angle, thereby releasing the mold. A molded product can be obtained. As a result, the mold itself is small and the device itself is compact, and there are few design restrictions, while the mold design and design can be changed with a high degree of freedom, and molding of molded products with complex shapes is possible. It is possible to provide an injection molding apparatus suitable for

(2) In order to achieve the above object, according to the invention described in claim 4, the guide means is provided with the block die and the molding die during a period from the die opening position to the first releasing position. The article and the second mold are moved in the opposite directions relative to each other, and while the first mold release position and the second mold release position are reached,
An injection molding apparatus is provided which moves the cam block and the molded product in opposite directions relative to the block mold. In the present invention, from the first viewpoint, the guide means includes a first ejector plate that relatively moves toward and away from the moving direction of the second die, and an elastic body, and one end portion thereof. Is a second ejector plate elastically pressed to the first ejector plate by a guide pin fixed to the first ejector plate, and one end is fixed to the first ejector plate and the other end is fixed to the other ejector plate. An end has a knockout pin that abuts the molded product, one end is fixed to the first ejector plate, the other end is a first rod fixed to the cam block, and one end is A second rod fixed to the second ejector plate and the other end fixed to the slide block, and one end fixed to the second mold and the other end fixed to the second mold. At the first mold release position, the abutment pin arranged so as to penetrate the first ejector plate and come into contact with the second ejector plate, and the first mold release position from the mold release position. While reaching the position, the first ejector plate and the second ejector plate relatively move closer to the second mold, and move from the first mold releasing position to the second mold releasing position. 5. The first ejector plate relatively moves toward the second mold during the period up to, and the second ejector plate maintains the first releasing position by the abutment pin. An injection molding device is provided (Claim 5).

Further, from a second viewpoint, the guide means is relatively close to a mounting plate provided in a fixed position with respect to the second mold and a moving direction of the second mold. A first ejector plate that moves apart, a second ejector plate whose one end is elastically pressed against the first ejector plate by a spring fixed to the mounting plate, and one end is the first ejector plate. Of the ejector plate, the other end of which is a knockout pin that abuts the molded product, and one end of which is fixed to the first ejector plate and the other end of which is fixed to the cam block. Rod and one end is the second
Fixed to the ejector plate, and the other end is fixed to the second rod fixed to the slide block and either the mounting plate or the second ejector plate,
A link having a link groove and a link pin fixed to the other one of the mounting plate and the second ejector plate and sliding in the link groove are further included, and the mold opening position extends to the first mold releasing position. In the interval, while the first ejector plate and the second ejector plate relatively move closer to the second mold and reach from the first mold release position to the second mold release position. The first ejector plate moves relatively closer to the second mold, the link pin abuts an end of the link groove, and the second ejector plate maintains the first release position. An injection molding apparatus is provided (Claim 6). In the present invention, the operation of the guide means in the first stage from the mold opening position to the first mold releasing position and the operation from the first mold releasing position to the second mold releasing position are performed.
The invention will be specified from the viewpoint of the operation of the guide means in the second stage of reaching the release position. That is, during the period from the mold opening position to the first mold releasing position, the block mold and the molded product are moved in the opposite directions relative to the second mold to first move the block mold to the second mold. Remove from the mold. First
At the mold release position, the molded product is placed in the block mold.

Subsequently, the guide means moves the cam block and the molded product in opposite directions relative to the block mold during the period from the first mold releasing position to the second mold releasing position. Here, the cam block and the molded product move in opposite directions with respect to the block mold. By moving the cam block in the opposite direction with respect to the block type, the cam block is inserted into the cam block guide groove, and the slide block slides into the slide block guide groove. in this way,
By these two-stage operations, the guide means guides the block mold in the direction corresponding to the undercut angle, so that the block mold moves in the direction corresponding to the undercut angle relative to the molded product. It is possible to obtain a molded product which is separated from the mold and is released from the mold.

Subsequently, this operation is specifically driven 2
One aspect is demonstrated. First, in the injection molding apparatus of the first aspect, the first ejector plate that relatively moves toward and away from the moving direction of the second mold, and the second ejector plate that is elastically pressed against the ejector plate by the guide pin. And an ejector plate. The knockout pin and one end of the first rod are fixed to the first ejector plate. The other end of the knockout pin is in contact with the molded product, and the other end of the first rod is fixed to the cam block. On the other hand, the end of the second rod is fixed to the second ejector plate, and the other end of the second rod is fixed to the slide block. Further, an abutting pin whose one end is fixed to the second die abuts on the second ejector plate at the first releasing position.

Explaining the operation of this injection molding apparatus, the first ejector plate and the second ejector plate move relatively toward the second mold from the mold open position to the first separated position. To do. At this time, since the second ejector plate is elastically pressed against the first ejector plate by the guide pin, the two ejector plates move while maintaining the positional relationship at the mold opening position. In this movement, the knockout pin fixed to the first ejector plate and the molded product abutting the other end,
And also a first fixed to the first ejector plate
The rod and the cam block fixed to the other end similarly move toward the second mold. Further, the second rod fixed to the second ejector plate and the slide block fixed to the other end also move toward the second mold. By this movement, the block mold is separated from the second mold.

Then, when the first separated position is reached, the abutment pin penetrates the first ejector plate and abuts against the second ejector plate. Since one end of the butting pin is fixed to the second mold, the second ejector plate stops the approaching movement and maintains the first releasing position. The first ejector plate, through which the butting pin penetrates, continues to move closer together with the cam block and the molded product, so that the cam block is inserted into the cam block guide groove and the molded product is released from the block mold. . In the operation of inserting the cam block, the slide block stops together with the second ejector plate and moves to the second
Since the slide block guide groove provided along the direction substantially perpendicular to the moving direction of the die slides, the block die also maintains the first release position. In this way, the operation of inserting the cam block at an angle along the undercut angle direction with respect to the moving direction of the second die and the slide block in the direction substantially perpendicular to the moving direction of the second die are performed. By the sliding operation, the guide means guides the block mold in the direction corresponding to the undercut angle, so that the block mold is relatively separated from the molded product in the direction corresponding to the undercut angle,
As a result, a molded product that has been released can be obtained.

Thus, the molding machine can be designed and its design can be changed with a high degree of freedom, and the molding of a complicated shape can be achieved with the advantages that the apparatus itself is compact and the molding apparatus itself is compact and there are few restrictions in design. An injection molding device suitable for molding a product can be provided.

Next, the injection molding apparatus of the second aspect will be described. This injection molding apparatus is the first described above.
The basic operation is the same as that of the injection molding apparatus of the above aspect. The different point is the stop mechanism of the second ejector plate in the first release position. Therefore, here, the description will focus on the stop mechanism of the second ejector plate.

This injection molding apparatus is provided with a mounting plate fixedly positioned with respect to the second mold, a first ejector plate relatively moving toward and away from the second mold, and a first spring with a spring. And a second ejector plate that is pressed against the first ejector plate. Further, it has a knockout pin having the same configuration as the injection molding device described above, a first rod, a second rod, a slide block, and a cam block. In addition to this, the link fixed to either the mounting plate or the second ejector plate and the link groove provided in this link are slid to be fixed to the other of the mounting plate or the second ejector plate. And a linked pin. The link pin slides in the link groove of the link, and when it abuts on the end of the link groove, the sliding is stopped.
This link is fixed to either the mounting plate or the second ejector plate, and the link pin is fixed to the other. That is, the link pin is fixed to the second ejector plate when the link is fixed to the mounting plate, and the link pin is fixed to the mounting plate when the link is fixed to the second ejector plate. With such a link and link pin, the positional relationship between the mounting plate or the second mold and the second ejector plate that are fixed in position to the mounting plate can be defined.

Explaining the operation of this injection molding apparatus, the first ejector plate and the second ejector plate move relatively closer to the second mold from the mold open position to the first separated position. To do. At this time, since the second ejector plate is elastically pressed against the first ejector plate by the spring, the two ejector plates move while maintaining the positional relationship at the mold opening position. In this movement, the knockout pin fixed to the first ejector plate and the molded product abutting the other end,
And also a first fixed to the first ejector plate
The rod and the cam block fixed to the other end similarly move toward the second mold. Further, the second rod fixed to the second ejector plate and the slide block fixed to the other end also move toward the second mold. By this movement, the block mold is separated from the second mold.

Then, when the first separated position is reached, the link pin contacts the end of the link groove. The link having the link groove and the link pin are fixed to either the mounting plate or the second ejector plate,
The second ejector plate maintains the first release position by the contact of the link pin with the end of the link groove. On the other hand, the first link and link pin is not fixed
Since the ejector plate of (1) continues to move closer together with the cam block and the molded product, the cam block is inserted into the cam block guide groove and the molded product is released from the block mold.

In this way, the same operation and the same effect as the injection device described above are obtained, and in addition, the same effect is obtained without including the structure corresponding to the guide pin of the injection molding device described above. Therefore, the number of parts can be reduced.

[0023]

According to the invention described in claims 1 to 6, the molding die can be designed with a high degree of freedom while having the advantages that the apparatus itself is compact with few die constituent units and there are few design restrictions. Further, it is possible to provide an injection molding device which can be modified in design and is suitable for molding a molded product having a complicated shape.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, a molded product molded by the injection molding apparatus 1 according to this embodiment will be described with reference to FIG. This molded product has a tip portion thicker than the base end portion as viewed from the mold opening surface, and a part of the molded product includes an undercut portion having a predetermined undercut angle with respect to the mold opening direction. Specifically, as shown in FIG. 1A, in this molded product, the tip portion W2 is thicker than the base end portion W1, and the mold is moved along the direction toward the tip portion indicated by the arrow p in the drawing. I can't release it. Further, as shown in FIG. 1B, which is a sectional view taken along the line aa of the molded product shown in FIG. 1A, a part of the molded product has a mold opening direction indicated by an arrow y in the drawing. On the other hand, it is impossible to move the mold along the direction indicated by the mold opening direction y and release the mold, including the undercut portion having the predetermined undercut angle α. In this way, the injection molding apparatus 1 according to this embodiment will be described by taking as an example the case of molding a molded product having a complicated shape and difficult to release. Next, the configuration of the injection molding device 1 according to the present embodiment will be described with reference to FIGS. 2 is a front cross-sectional explanatory view of the injection molding device according to the present embodiment in a state from completion of mold opening to before extrusion, FIG. 3 is a side cross-sectional explanatory view at the position c of the injection molding device of FIG. 2, and FIG. Side cross-sectional explanatory view of the injection molding apparatus at position d,
FIG. 5 is a plan view of the injection molding apparatus of FIG. In addition,
In this embodiment, the rigid injection molding apparatus 1 will be described as an example, but it goes without saying that the invention can also be applied to a horizontal injection molding apparatus.

Since FIG. 2 shows the state where the mold opening is completed, the first mold 5 forming the cavity 3 together with the second mold 6 is not shown. As shown in FIG. 2, the injection molding apparatus 1 is detachably fitted into a second mold 6 that moves relatively closer to and away from a first mold 5 (not shown) and the second mold 6. , And a block mold 7 that moves in a direction relatively opposite to the moving direction of the second mold 6. The molded product 2 is placed on the block mold 7, and
At least an undercut portion having a predetermined undercut angle with respect to the moving direction y of the mold is molded.

The block die 7 is guided by the guide means in the direction corresponding to the undercut angle. This guide means includes a cam block guide groove 9a provided inside the block die 7 and the cam block guide groove 9a.
Cam block 9 to be inserted into the slide block, a slide block guide groove 8a provided along a direction substantially perpendicular to the moving direction of the block die 7, and the slide block guide groove 8
and a slide block 8 that slides on a. Figure 2
The state shown by is a state in which the mold opening is completed and the mold release is not yet progressed, so the cam block 9 is not inserted into the cam block guide groove 9.

Next, the structure positioned as a drive mechanism for driving the guide means will be described. The guide means of this injection molding apparatus 1 has a first ejector plate 12 and a second ejector plate 13, and this second ejector plate 13 is made of an elastic body 15.
It is pressed against the first ejector plate 12 by a guide pin 14 provided with. The first ejector plate 12 includes a knockout pin 17 and a first rod 1
One end of 0 is fixed. The other end of the knockout pin 17 is in contact with the molded product 2, and the other end of the first rod 10 is fixed to the cam block 9. On the other hand, the second ejector plate 13 has a second
The end of the rod 11 of the
The other end of is fixed to the slide block 8.
Further, one end of the abutment pin 16 is fixed to the second die 6 so as to abut the second ejector plate 13 at the first releasing position. By the way,
This butting pin 16 is used for the first ejector plate 12
A through hole is provided in the first ejector plate so that the first ejector plate can be penetrated therethrough.

In order to explain in more detail the construction of the slide block 8 and the cam block 9 which are the center of the guide means, FIG. 3 shows a sectional view taken along the line cc of the injection molding apparatus 1 shown in FIG. Shows a d-d cross section of the injection molding apparatus 1 shown in FIG. In FIG. 3, the cross section of the slide cam block 8 is shown, and in FIG. 4, the cross section of the cam block is shown. As shown in FIG. 3, the slide block guide groove 8
The a is provided on the block mold 7 along a direction substantially perpendicular to the moving direction of the second mold 6. In this state, after the mold opening is completed and before the mold release is started, the slide block 8a does not move, and is close to the end portion of the slide block guide groove 8a. The slide block 8 shown here is a rectangular member, but the shape is not particularly limited. As shown in FIG. 4, the cam block guide groove 9a
Are formed inside the block mold 7 along the undercut angle. The cam block 9 which is rotatably locked to the end of the first rod 10 is inserted into the cam block guide groove 9a. The shape of the cam block 9 is also not particularly limited, and a rod-shaped member or a cylindrical member can be applied.

FIG. 5 is a diagram showing the state of completion of mold opening as seen from the plane direction of the block mold 9 (direction in which the first mold 5 is present). A cam block guide groove 9 is provided inside the block mold 9.
a, the cam block 9, the slide block guide groove 8, and the slide block 8 are arranged adjacent to each other.
Since both the slide block 8 and the cam block 9 are small members, their arrangement can be determined according to the injection molding apparatus to which they are applied. It can be freely determined in consideration of various conditions such as layout restrictions and layout restrictions of the temperature control water holes of the second mold 6.

Next, the operation of the injection molding apparatus 1 according to this embodiment will be described with reference to FIGS.
FIG. 6 shows the first part of the injection molding apparatus according to the present embodiment during mold release.
7 is a front cross-sectional explanatory view of the injection molding apparatus according to the present embodiment at the second release position, showing the completion of the mold release of the injection molding apparatus according to the present embodiment. FIG. 9 is a side sectional explanatory view at a position c, FIG. 9 is a side sectional explanatory view at a position d of the injection molding apparatus of FIG. 7, and FIG. 10 is a plan explanatory view of the injection molding apparatus of FIG. 7.

Mold release is started from the state where the mold opening shown in FIG. 2 is completed, and the state shown in FIG. 6 is a diagram showing the state at the first mold releasing position. After the mold opening is completed, the first ejector plate 12 moves closer to the second mold 6. At this time, since the second ejector plate 13 is elastically pressed against the first ejector plate 12 by the guide pin 14, the first ejector plate 12 and the second ejector plate 13 are in contact with each other to the second mold 6. approach. By the way, the first and second ejector plates 12 and 13 may move closer to each other, the second die 6 may move closer to each other, and it is only necessary that these relatively approach each other. Due to this approaching movement, the first rod 10 and the knockout pin 17 fixed to the first ejector plate 12 and the second rod 11 fixed to the second ejector plate 13 are both moved to the second It moves along the approaching direction (upward direction in FIG. 6) to the mold 6. As a result, the cam block 9 fixed to the other end of the first rod, the slide block 8 fixed to the other end of the second rod, the block mold 7 that engages with the slide block 8, and the knockout pin 17 are provided. The molded product 2 fixed to the other end is relatively separated from the second mold 6. In FIG. 6, these are block molds 7 and second molds 6.
It shows the state of having separated from. At this time, the second mold 6
The abutment pin 16 having one end fixed to the first end penetrates the first ejector plate 12 and is in contact with the second ejector plate 13. This butting pin 16
As a result, the second ejector plate 13 is
Cannot approach type 6 of In this embodiment, this state is defined as the first release position.

FIG. 7 shows the state at the second mold releasing position where the mold releasing is further advanced from the first mold releasing position. In the process from the first releasing position to the second releasing position,
The block die 7 will be guided in the direction corresponding to the undercut angle. As shown in FIGS. 6 and 7, the second ejector plate 13 abuts on the abutment pin 16 and maintains a predetermined distance from the second die 6 and stops in a state where the first release position is maintained. is doing. On the other hand, the first ejector plate 12 continues to move relatively closer to the second die 6 from the first releasing position (FIG. 6). At this time, the second
Since the ejector plate 13 maintains the first release position, the second rod 11 fixed to the ejector plate 13 also maintains the first release position. The slide block 8 fixed to the other end of the second rod 11 also has the first
Of the block mold 7 including the slide block guide groove 8a in which the slide block guide groove 8a slides is also maintained at the first mold release position. On the other hand, the first ejector plate 12 continues to move closer to the second mold 6, and the arc ejector plate 1
First rod 10, fixed to 2 and knockout pin 1
7 also moves to the cam blocks 9 at these other ends,
The molded product 2 also moves in the same direction.

As described above, the cam block 9 and the molded product 2 move in the opposite directions with respect to the block mold 7 which maintains the first mold release position. In order to explain this state in detail, FIG. 8 shows a sectional view at the position cc shown in FIG. 7, and FIG. 9 shows a sectional view at the position dd shown in FIG.

As shown in FIG. 9, the cam block 9 which moves together with the first ejector 12 is inserted into the cam block guide groove 9a. The cam block guide groove 9a is provided at an angle along the undercut angle, and the cam block 9 that moves in the direction opposite to the block die 7 is inserted therein. At this time, since the cam block guide groove 9a has an angle, the cam block 9
Block type 7 by the insertion of
9 is moved in the lateral direction in FIG. In this way, the block mold 7 is moved in the lateral direction by the operation shown in FIG.
It is a slide mechanism of the slide block die 8 and the slide block guide groove 8a with which this slides. That is, by inserting the cam block 9 into the cam block guide groove 9a, the block die 7 is pushed up in a direction relatively opposite to the moving direction of the block die 7 (upward in the drawing), but the block die 7 is substantially moved. The upper fixed slide block 8 counters this and maintains the position of the block mold 7. The slide block 8 slides in the slide block guide groove and slides in a direction substantially perpendicular to the moving direction of the second die 6. In this way, the block mold 7 moves laterally as shown in FIGS. FIG. 10 is a plan view showing the moving state of the block die 7. Figure 1
As indicated by 0, the position of the block mold 7 at the first mold release position indicated by the two-dot chain line becomes the position shown by the solid line at the second mold release position, and the block mold 7 is shown in the horizontal direction in the drawing. Is sliding to.

Here, the action of the knockout pin 17 is further added. The knockout pin 17 moves together with the first ejector pin 12 in a direction opposite to the block mold 7 and pushes up the molded product 2 in this direction.

As described above, the block die 7 slides in the horizontal direction in the figure, and the molding die 2 moves upward in the figure, so that the molded article 2 and the block die 7 are positioned at a predetermined angle. It will shift in the diagonal direction that it has. As a result, the block die 7 is guided in the direction corresponding to the undercut angle, and the molded product 2 is released from the block die 7 without any resistance. By the way, the mold clamping can be performed by the reverse step of the mold release described above.

As described above, since the guide direction of the block die 7 which is the point of mold release can be set by the shape of the cam block guide groove 9a, the constraint on the design of the die is small and the degree of freedom of product design is small. large. Further, the product change such as the change of the releasing direction can be easily dealt with by changing the shape of the cam block guide groove 9a. Further, since the structure centering on the second mold 6 and the block mold 7 is adopted, the mold constituent unit can be made compact, and restrictions on the outer dimensions of the mold and restrictions on the establishment of the layout with other constituent units. Can be made smaller, adjustment with the temperature control water hole layout inside the second mold 6 is easy, and there is no inconvenience that mold temperature control will occur due to the new mechanism. In addition, since the number of parts of the unit having the mold configuration is reduced and the number of parts requiring assembly adjustment is also reduced, the manufacturing cost and running cost of the entire injection molding apparatus can be reduced.

<First Embodiment> This first embodiment relates to the shapes of the slide block 8 and the slide block guide groove 8a of the guide means described above. This is shown in FIG. FIG. 11 is a diagram showing the cam block guide groove 9a, the cam block 9, the slide guide groove 8a, and the slide guide groove 8 with the block die 7 as the center. The slide guide groove 8a and the slide guide 8 shown in FIG. 2 are rectangular, but in this embodiment, they are substantially cylindrical members. Thereby, the workability of the slide guide groove 8a can be improved.

<Second Embodiment> This second embodiment can be positioned as another example of the drive mechanism of the guide means described above. Also in this embodiment, the block mold 7 has an undercut angle during the transition from the mold opening to the first mold releasing position and the second mold releasing position, and from the first mold releasing position to the second mold releasing position. According to the above-mentioned embodiment, the operation is similar to that of the above-described embodiment. Here, redundant description will be omitted, and the configuration and operation relating to drive control at the first release position will be described with reference to FIGS. 12 to 14. FIG. 12 is a front cross-sectional explanatory view of the injection molding device according to the second embodiment in a state from mold opening to release.
FIG. 14 is a front cross-sectional explanatory view of the injection molding apparatus according to the second embodiment in the middle of mold release, and FIG. 14 is a side view explanatory view of the injection molding apparatus of FIG. In these drawings as well, the duplicated description is avoided and the configuration described here is mainly shown.
FIG. 12 is a diagram showing a state after mold opening. Each configuration will be described with reference to this figure. In this figure, the first ejector plate 12 and the second ejector plate 13 are shown.
And a mounting plate 22 arranged in parallel therewith. The second ejector plate 13 is a mounting plate 22.
It is elastically pressed against the first ejector plate 12 by a spring 21 fixed to. The support pin 18 includes a mounting plate 22 and a first ejector plate 12
And the second ejector plate 13 are supported. The mechanism for controlling the drive of the first ejector plate 12 and the second ejector plate 13 is the link 19
And the link pin 20. In this embodiment, the link 19 is fixed to the mounting plate 22 and has a link groove 19a, and the link pin 20 is the second ejector plate 1
It is fixed to 3 and slides in the link groove 19a. Note that the link 19 can be fixed to either the mounting plate 22 or the second ejector plate 13 without being limited to this, while the link pin 20 that slides in the link groove 19a can be fixed to the mounting plate 22 or It can be fixed to either the other of the second ejector plates 13. That is, since it suffices to relatively determine the positional relationship between the mounting plate 22 fixed in position on the second die 6 and the second ejector plate, the link 19 and the link pin are respectively attached to the mounting plate 22 or the ejector plate 13. It should be fixed to the crab.

Next, the operation from the mold opening position to the first releasing position will be described. FIG. 13 shows the state at the first release position. The second ejector plate 13, which is pressed against the first ejector plate 12 by the spring 21, makes a relative approaching movement to the second die 6 together with the first ejector plate 12. At this time, the second
The link pin 20 that moves together with the ejector plate 13 slides in the link groove 19 a provided in the link 19. The link groove 19a is provided along the link 19 as shown in FIG. Since the link pin 20 slides in the link groove 19a, its movement is stopped when it abuts on the end of the link groove 19a. Then, the second
The ejector plate 13 stops at a predetermined position with respect to the mounting plate 22. In this embodiment, this state is the first release position. The operation from here is similar to that of the above-described embodiment, the slide cam block 8 and the block die 7 maintain the first release position together with the stopped second ejector plate 13, and the first ejector plate 12 together, The cam block 9 and the molded product 2 move relatively in the opposite direction to the block die 7, the cam block 9 is inserted into the cam block guide groove 9a, and the slide block 8 slides in the slide block guide groove 8a. 7 is guided in the direction corresponding to the undercut angle with respect to the molded product 2 and is released from the mold, and the same effect as that of the above embodiment can be obtained.

With this configuration, even if there is no configuration corresponding to the guide pin 14 shown in FIG. 6 that supports the first ejector plate 12 and the second ejector plate 13, the same effect is obtained by the same operation. Therefore, the number of parts can be reduced. Note that the embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above-described embodiment is intended to include all design changes and equivalents within the technical scope of the present invention.

[Brief description of drawings]

FIG. 1A is a diagram showing the shape of a molded part obtained by an injection molding apparatus according to this embodiment. Figure 1
(B) is a figure which shows the aa cross section of the molded component shown in FIG. 1 (a).

[Fig. 2] Completion of mold opening of the injection molding apparatus according to the present embodiment.
It is front cross-sectional explanatory drawing in the state before extrusion.

FIG. 3 is a side cross-sectional explanatory view at the position c of the injection molding apparatus of FIG.

FIG. 4 is a side cross-sectional explanatory view of the injection molding device of FIG. 2 at a d position.

5 is a plan view of the injection molding apparatus shown in FIG.

FIG. 6 is a front cross-sectional explanatory view of the injection molding apparatus according to the present embodiment at a first mold releasing position during mold releasing.

FIG. 7 is a front cross-sectional explanatory view of the injection molding apparatus according to the present embodiment at a second mold release position after completion of mold release.

8 is an explanatory side cross-sectional view of the injection molding apparatus of FIG. 7 at position c.

9 is a side sectional view of the injection molding apparatus of FIG. 7 at a position d.

10 is an explanatory plan view of the injection molding apparatus of FIG.

FIG. 11 is a diagram for explaining the first embodiment.

FIG. 12: Mold opening of an injection molding device according to a second embodiment
It is a front cross-sectional explanatory view in a state before release.

FIG. 13 is a front cross-sectional explanatory view of the injection molding device according to the second embodiment in the state of being released from the mold.

14 is a side view of the injection molding apparatus of FIG.

FIG. 15A is a side cross-sectional explanatory view showing an example of a conventional undercut processing structure, and FIG. 15B is a plan explanatory view thereof.

16 (a) is a side cross-sectional explanatory view showing another example of the conventional undercut processing structure, and FIG.
16B is a front cross-sectional explanatory view at the position bb shown in FIG. 16A, and FIG. 16C is a plan explanatory view thereof.

[Explanation of symbols]

1 ... Injection molding equipment 10 ... Injection Molding Apparatus According to First Embodiment 20 ... Injection molding apparatus according to second embodiment 2. Molded product 2a ... Undercut part 3 ... Cavity 5 ... first mold 6 ... second mold 7 ... Block type 8 ... Slide block 8a ... Slide block guide groove 9 ... Cam block 9a ... Cam block guide groove 10 ... the first rod 11 ... second rod 12 ... First ejector plate 13 ... Second ejector plate 14 ... Guide pin 15 ... Elastic body 16… Abutting pin 17 ... Knockout pin 18 ... Support pin 19 ... Link 19a ... Link groove 20 ... Link pin 21 ... Spring 22 ... Mounting plate

Claims (6)

[Claims] 1. A first die, a second die that moves closer to and away from the first die, and a molded article formed by the first die and the second die. , At least an undercut portion having a predetermined undercut angle with respect to the moving direction of the second mold is formed, and the undercut portion is removably fitted into the second mold and is relative to the moving direction of the second mold. And a block mold that moves in the opposite direction, and the block mold has an injection molding device including guide means for guiding the block mold separated from the second mold in a direction according to the undercut angle. . 2. The guide means moves in a direction relatively opposite to a moving direction of the block mold and a cam block guide groove provided in the block mold along the predetermined undercut angle direction. A cam block inserted into the cam block guide groove, a slide block guide groove provided in the block mold along a direction substantially perpendicular to the moving direction of the second mold, and the slide block guide groove The injection molding apparatus according to claim 1, further comprising: 3. The injection molding apparatus according to claim 2, wherein the slide block is a substantially columnar member having an axial direction that is substantially orthogonal to a direction in which the slide block guide groove is provided. 4. The guide means moves the block mold and the molded product in opposite directions relative to the second mold during the period from the mold opening position to the first mold releasing position. 4. The cam block and the molded product are moved in opposite directions relative to the block mold during the period from the first mold release position to the second mold release position. Injection molding equipment. 5. The guide means includes a first ejector plate that moves toward and away from each other with respect to the moving direction of the second die, and an elastic body, and one end of the first ejector plate is the first ejector. A second ejector plate elastically pressed against the first ejector plate by a guide pin fixed to the plate; one end is fixed to the first ejector plate, and the other end is the molded product. A knockout pin that abuts against the first ejector plate, one end of which is fixed to the first ejector plate and the other end of which is fixed to the cam block, and one end of which is the second ejector plate. Fixed to the slide block and the other end is fixed to the second slide block.
And one end is fixed to the second mold and the other end penetrates the first ejector plate to come into contact with the second ejector plate in the first releasing position. And an abutting pin disposed in the second mold, wherein the first ejector plate and the second ejector plate have the second mold between the mold open position and the first mold release position. The first ejector plate relatively moves toward the second mold while the first ejector plate relatively moves toward the second mold position from the first mold release position to the second mold release position. The second ejector plate maintains the first release position by the butting pin.
The injection molding apparatus described. 6. The guide means includes a mounting plate that is fixedly positioned with respect to the second mold, and a first ejector that relatively moves toward and away from the moving direction of the second mold. A plate, a second ejector plate, one end of which is elastically pressed against the first ejector plate by a spring fixed to the mounting plate, and one end of which is fixed to the first ejector plate, The other end is a knockout pin that abuts the molded product, one end is fixed to the first ejector plate, the other end is a first rod fixed to the cam block, and one end is Part is fixed to the second ejector plate and the other end is a second part fixed to the slide block.
And a link having a link groove fixed to either the mounting plate or the second ejector plate, and a link fixed to the other of the mounting plate or the second ejector plate and sliding in the link groove. A pin, wherein the first ejector plate and the second ejector plate relatively move toward the second mold during the period from the mold open position to the first mold release position. However, while the first ejector plate relatively moves toward the second mold while the first mold release position reaches the second mold release position, the link pin moves in the link groove. 5. The injection molding apparatus according to claim 4, wherein the second ejector plate maintains the first release position while abutting the end of the second ejector plate.