JPH0671702A - Ejecting device of metal mold for molding resin - Google Patents

Abstract

PURPOSE:To effectively prevent damage of an ejector pin due to interference without complicating an ejecting device of a metal mold for molding resin. CONSTITUTION:An ejecting device of a mold for molding resin drives an ejector rod 16 of a molding machine in a state that mold plates 10, 11 are opened, and advances an ejector plate 23 arranged on an extension region of the rot 16 to the plate 11 thereby to allow a resin molded form to protrude through ejector pins 25, 26 arranged on the plate 23. A plug 16d is formed on the rod 16, and a socket 30 to be attached to or detached from the plug 16d is arranged on the plate 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for ejecting a molded product from a resin molding die used in injection molding or the like, and more specifically, to a molding machine in which mold plates are expanded. The ejector rod is driven to move the ejector plate disposed in the extension area of the ejector rod forward with respect to one of the template plates, so that the resin molded product is ejected through the ejector pin disposed on the ejector plate. The present invention relates to the improvement of an ejecting device for ejecting the protrusion.

[0002]

2. Description of the Related Art Conventionally, in resin molding such as injection molding, as shown in FIG. 5 (a), an ejector rod of an injection molding machine (not shown) in which mold plates 1 and 2 are spread apart from each other. The ejector plate 4 disposed in the extension area of the ejector rod 3 is moved forward with respect to one of the template plates 2 by driving the ejector plate 3.
The resin molded product 6 is projected through the ejector pin 5 arranged in the.

In this type of ejecting device, a return pin 7 is usually arranged on the ejector plate 4, and when the template plates 1 and 2 are closed to each other, the return is performed with the ejector rod 3 retracted. By bringing the pin 7 into contact with the other mold plate 1, the ejector plate 4 and the ejector pin 5 are retracted with respect to the one mold plate 2 via the return pin 7.

[0004]

By the way, in order to subject the resin molded product 6 to undercut processing and the like, the above ejecting device is applied to the mold in which the slide block 8 is disposed on one mold plate 2. In this case, when the template plates 1 and 2 are closed to each other, the slide block 8 and the ejector pin 5 interfere with each other before the return pin 7 fully operates as shown in FIG. There is a possibility that the slide block 8 and the ejector pin 5 may be damaged.

Therefore, in the prior art, a spring is interposed between one of the mold plates and the ejector plate, and when the ejector rod retracts due to the elastic pressing force of the spring, the ejector plate and the ejector pin are respectively provided on the one mold plate. With respect to the one that is made to move back and forth, or a cylinder actuator is interposed between one of the template and the ejector plate, and by the operation of the cylinder actuator,
There is provided an ejecting device in which an ejector plate and an ejector pin are moved in a retracted manner with respect to one of the mold plates when the ejector rod retracts.

However, in the ejecting device using the spring, when the actuating resistance of the ejector pin increases due to the occurrence of scoring, the retracting action of the ejector pin due to the pressing force of the spring becomes uncertain. There is fear,
On the other hand, in the eject device using the cylinder actuator, a circuit for controlling the operation of the cylinder actuator is required, and the device becomes extremely complicated.

In view of the above situation, an object of the present invention is to provide an ejecting device for a resin molding die capable of reliably preventing damage to an ejector pin due to interference without causing the device to be complicated. Especially.

[0008]

In the ejecting apparatus for a resin molding die according to the present invention, the ejector rods of the molding machine are driven in a state where the mold plates are spread apart from each other, and the ejector rods are arranged in the extension region of the ejector rods. An ejecting device for a resin molding die, in which a provided ejector plate is moved forward with respect to one of the mold plates to eject the resin molded product through an ejector pin arranged on the ejector plate. In the above, between the ejector rod and the ejector plate, a linking means for detachably linking the ejector rod and the ejector plate is arranged.

[0009]

According to the above construction, since the ejector rod and the ejector plate are linked to each other by the linking means, the ejector plate and the ejector pin are linked with each other when the ejector rod is retracted with respect to one template. It can be moved.

[0010]

The present invention will be described in detail below with reference to the drawings showing the embodiments. FIG. 1 shows a resin molding facility to which an ejector device according to the present invention is applied. The resin molding equipment illustrated here includes an angular pin 12 projecting from a fixed mold plate 10 toward a movable mold plate 11, and a slide core 1 slidably arranged on the movable mold plate 11.
In cooperation with 3, the injection-molded product 14 having a recess 14a which is recessed in the lateral direction with respect to the mold opening / closing direction (the arrow X direction in the drawing).
The movable die plate 15 is equipped with an ejector rod 16. As shown in FIG. 4A, the ejector rod 16 has a fitting portion 16a formed at its tip end portion and having a diameter smaller than that of the base end portion, and an outer diameter gradually increasing from the base end of the fitting portion 16a. An annular engagement protrusion 16b that is bulged in an increasing manner and is formed to have the same outer diameter as the base end, and is provided adjacent to the engagement protrusion 16b, and is the same as the fitting portion 16a. Has a plug (linking means) 16d formed of an annular engaging recess 16c formed in the outer diameter of the above, and is provided in the guide hole 15a formed in the movable die plate 15 in the mold opening / closing direction X. It is arranged so that it can move forward and backward. Although not shown in the drawing, an actuator for moving the ejector rod 16 forward and backward along the axial center of the guide hole 15a is connected to the base end portion of the ejector rod 16.

On the other hand, as shown in FIG. 1, in the injection molding die applied to the injection molding equipment, the fixed mold plate 1 is used.
0 is attached to the fixed side mounting plate 18 via the intermediate plate 17, while the movable side mold plate 11 is attached to the movable side mounting plate 21 via the receiving plate 19 and the spacer block 20. When the mold plates 10 and 11 are closed with each other via the molds 21 and 21, the cavity 10a provided in the fixed mold plate 10 and the core 11a provided in the movable mold plate 11 and the slide core 1 are provided.
A product cavity 22 is defined between the two. In the state where the template plates 10 and 11 are closed to each other as described above, the angular pin 12 is fitted into the guide inclined hole 13a formed in the slide core 13, and the slide core 13 is at the maximum position in the figure. By occupying the right side, the protrusion 13b is arranged at a position corresponding to the recess 14a of the injection molded product 14 in the product cavity 22.

The injection molding die has an ejector plate 23 between the movable side mounting plate 21 and the receiving plate 19. The ejector plate 23 is a pair of plate constituent elements 2 divided in the mold opening / closing direction X.
3a, 23b, which are arranged so as to be movable along the mold opening / closing direction X, and which are provided with sprue lock pins 24 outside the area defined by the product cavity 22 on the surface facing the receiving plate 19, and Ejector pins 25 and 26 are provided at appropriate portions of a portion corresponding to the defined area of the product cavity 22, for example, at a portion facing the slide core 13 and a portion corresponding to a flat portion of the injection molded product 14 in the embodiment. In addition, a socket (linkage means) 30 is provided on the surface facing the movable side mounting plate 21.

The sprue lock pin 24 and the ejector pins 25 and 26 are respectively extended along the mold opening / closing direction X, and the respective tip portions of the sprue lock pin 24 and the ejector pins 25 and 26 are projected and retracted from the movable side mold plate 11 via the receiving plate 19. In a mode, the movable side template 1
It is movably supported within 1.

As shown in FIG. 4A, the socket 30 is fixed to the ejector plate 23 and has a fitting hole 31a for accommodating the tip of the ejector rod 16 in the center thereof. The socket body 31 is movably supported at a plurality of locations corresponding to the engaging recesses 16c of the ejector rod 16 in such a manner that the socket body 31 alternately appears and disappears from the outer peripheral surface and the inner peripheral surface. Rock balls 32, 32
, And has a cylindrical shape with an annular rib 33a formed on the inner peripheral surface thereof, and is movably arranged along the axial direction of the socket while the rib 33a is in sliding contact with the outer peripheral surface of the socket body 31. The slider 33 is provided between the slider 33 and the socket body 31, and the slider 33 is always mounted on the ejector plate 23 with respect to the socket body 31.
And a spring 34 that presses in a direction away from the ejector plate 23, and is arranged on the ejector plate 23 in such a manner that the axis of the fitting hole 31a matches the mold opening / closing direction X. The reference numeral 35 in the drawing regulates the movement of the slider 33 with respect to the socket main body 31 in the falling direction, so that the rib 33a of the slider 33 is locked to the lock balls 32, 32.
A stopper ring that holds the lock balls 32, 32 ... In a state of protruding from the inner peripheral surface of the fitting hole 31a by matching with the arrangement area of.

Further, as shown in FIG. 1, the injection molding die has a through hole 40 in a portion of the movable side mounting plate 21 facing the socket 30 of the ejector plate 23. As shown in FIG. 4A, the through hole 40 is formed from the ejector plate 23 side and has a large diameter portion 40a formed to have a larger diameter than the slider 33 of the socket 30, and the large diameter portion 40a. A small diameter arranged concentrically with respect to each other, having a smaller diameter than the slider 33 of the socket 30 and larger than the socket body 31 of the socket 30 and the guide hole 15a of the movable side die plate 15, respectively. Part 40b, and is arranged in such a manner that its axis matches the mold opening / closing direction X.

Reference numeral 41 in FIG. 1 is a stopper interposed between the ejector plate 23 and the movable side mounting plate 21 to secure a predetermined gap between the ejector plate 23 and the movable side mounting plate 21. It's a pin.

In the injection molding facility constructed as described above, first, the state shown in FIG. 1, that is, the movable side mounting plate 2 is used.
In the state where the movable side mold plate 11 is closed with respect to the fixed side mold plate 10 and the ejector plate 23 is most retracted with respect to the movable side mold plate 11, the product cavity for injection molding is formed. Molten resin is injected into 22. At this time, the socket 3 arranged on the ejector plate 23
At 0, as shown in FIG.
The front end surface of the stepped portion 4 formed at the meeting portion of the large diameter portion 40a and the small diameter portion 40b of the through hole 40 in the movable side mounting plate 21.
0c, the slider 33 is reciprocally moved against the pressing force of the spring 34, and the rib 33a thereof is occupied outside the area where the lock balls 32, 32 ... Are arranged.

When the molten resin is solidified in the product cavity 22 by appropriately holding and cooling it after injecting the molten resin, as shown in FIG. When the ejector rod 16 moves forward with respect to the ejector plate 23 from the fixed side template 10 by expanding and moving, the plug 16d of the ejector rod 16 fits into the socket body 31 of the socket 30. The fitting hole 31a is fitted.

When the ejector rod 16 further moves forward with the plug 16d fitted in the socket 30, the ejector pin 2 is moved through the ejector plate 23.
5 and 26 are respectively advanced and moved with respect to the movable side mold plate 11, and as shown in FIG.
The ejection operation of the injection-molded article 14 is performed by 5, 26.

At this time, the slide core 13 is moved to the left in the figure by the action of the angular pin 12 and the guide inclined hole 13a, and the projection 13b thereof is pulled out from the recess 14a of the injection-molded article 14, so that the movable mold The injection-molded article 14 can be easily taken out from the plate 11.

In the meantime, as shown in FIG. 4B, the ejector plate 23 is moved forward with respect to the movable side mold plate 11, and the tip end surface of the slider 33 in the socket 30 is a through hole in the movable side mounting plate 21. 40 steps 40c
When the slider 33 is separated from the slider 33, the slider 33 is moved forward by the pressing force of the spring 34, and the tip end of the slider 33 is held in a state of being pressed against the stopper ring 35.

In this state, as shown in FIG. 4C, the rib 33a of the slider 33 is engaged with the lock ball 3 by the rib 33a.
2, the lock balls 32,
32 are projected from the inner peripheral surface of the fitting hole 31a and are held at positions facing the engaging recess 16c of the ejector rod 16, so that the ejector rod 16 moves in a direction away from the socket 30. Has been blocked. Therefore, if the ejector rod 16 is retracted with respect to the movable mold plate 11 in order to perform the next injection molding from this state, as shown in FIG. 3A, the ejector plate 23 and the ejector plate are inserted through the socket 30. Pin 2
Since 5 and 26 are respectively retracted in conjunction with the ejector rod 16, the ejector plate 23 and the ejector pins 25 and 26 are moved most with respect to the movable side mold plate 11 in a state where the mold plates 10 and 11 are expanded. It can be placed in a degenerate position.

The ejector plate 23 is a movable mold plate 11
4A, the tip end surface of the slider 33 in the socket 30 again has the stepped portion 40 of the through hole 40 in the movable side mounting plate 21, as shown in FIG. 4A.
By being pressed against c, the slider 33 is retracted and moved against the pressing force of the spring 34, and the rib 33a thereof is occupied outside the area where the lock balls 32, 32 ... Are arranged.

Therefore, when the ejector rod 16 is further retracted from the above state, the lock balls 32, 32 ... Depart from the engaging recess 16c of the ejector rod 16 as shown in FIG. 3 (b). As a result, the linked state between the ejector rod 16 and the socket 30 is released.

During this time, the movable side mold plate 11 is moved through the movable side mounting plate 21 in the direction in which it is closed with respect to the fixed side mold plate 10, and the angular pin 12 is guided by the guide inclined hole 13.
When the slide core 13 is fitted into the product a, the slide core 13 faces the product cavity 22 at a predetermined position, that is, the protrusion 13 thereof.
b is returned to the position corresponding to the recess 14a of the injection molded product 14 in the product cavity 22.

When the template plates 10 and 11 are moved in the direction of closing each other, the ejector pins 25 and 2 are moved as described above.
6 is arranged at the most retracted position with respect to the movable side mold plate 11, so that the ejector pin 25 is attached to the slide core 1
The situation that interferes with 3 does not occur.

After that, the above-described operation is sequentially repeated to perform the next injection molding.

As described above, according to the ejecting apparatus for the injection molding die, the ejector rod 16 and the ejector plate 23 are inserted through the plug 16d and the socket 30.
Are linked to each other, and when the ejector rod 16 is retracted relative to the movable side mold plate 11, the ejector plate 2
3 and the ejector pins 25 and 26 can be interlocked with each other to be retracted and moved, so that the ejector pin 25 can be reliably prevented from being damaged due to interference with the slide core 13 without complicating the device. Becomes

In the above embodiment, the stationary mold plate is provided with the angular pins, the movable mold plate is provided with the slide cores, and the angular pins and the slide cores cooperate with each other in the lateral direction with respect to the mold opening / closing direction. The ejecting device for an injection molding die applied when molding an injection-molded article having a recessed portion is illustrated. However, the present invention is not limited to this, and for example, a fixed-side mold plate has a slide block. Of course, the present invention can be applied to a resin-molding die provided with and a die for molding a resin-molded article having another shape.

Further, in the above embodiment, since the socket and the plug which are attached to and detached from each other by the advancing and retreating movement of the ejector rod are exemplified as the connecting means, the ejector rod and the ejector plate can be easily linked. The present invention includes, for example, pins and holes,
Of course, linking means having other configurations may be adopted. In the case of adopting the linking means composed of the socket and the plug, in the embodiment, the socket is arranged on the ejector plate and the plug is formed on the ejector rod, but the reverse mode may be adopted. Further, the linking means between the ejector rod and the ejector plate is attached and detached each time the ejector rod is moved back and forth. However, in the present invention, the template is die-plated via the mounting plate when the setup is changed. The linking means between the ejector rod and the ejector plate may be attached / detached only when they are attached / detached, and the linking means may always be linked to each other during molding.

[0031]

As described above, according to the ejecting apparatus for the resin molding die of the present invention, the ejector rod and the ejector plate are linked to each other by the linking means, so that one type of the ejector rod is joined. Since the ejector plate and ejector pin can be interlocked and retracted during the retracted movement with respect to the plate, it is possible to reliably prevent damage to the ejector pin due to interference without complicating the device. Become.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a resin molding die to which an ejecting device for molded articles according to the present invention is applied.

2 (a) and 2 (b) are enlarged sectional views conceptually showing an ejecting device according to the present invention.

FIG. 3A and FIG. 3B are enlarged cross-sectional views conceptually showing an eject device according to the present invention.

FIG. 4 (a) to FIG. 4 (c) are sectional views conceptually showing the action of the linking means applied to the ejecting apparatus for molded products according to the present invention.

FIG. 5 (a) and FIG. 5 (b) are sectional views conceptually showing a conventional ejecting apparatus for a resin molding die.

[Explanation of symbols]

 10, 11 ... Template 14 ... Resin molded product 16 ... Ejector rod 16d, 30 ... Linking means 23 ... Ejector plate 24, 25 ... Ejector pin

Claims (1)

[Claims] 1. By driving an ejector rod of a molding machine in a state where the template plates are spread apart from each other and advancing an ejector plate disposed in an extension region of the ejector rod with respect to one template plate. In the ejecting device of the resin molding die for ejecting the resin molded product through the ejector pin disposed on the ejector plate, the ejector rod and the ejector plate are provided between the ejector rod and the ejector plate. An ejecting device for a resin molding die, comprising a connecting means for detachably connecting the ejector plates to each other.