JP3354701B2 - Injection mold equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold apparatus for ejecting a molded product from a cavity by using an ejector pin.

[0002]

2. Description of the Related Art As a conventional technique, there is, for example, a two-plate mold having a structure divided into a fixed mold S and a movable mold T as shown in FIG. A mold having this structure is often formed in a form in which a runner and a product are combined, and is often subjected to secondary processing.

In the fixed mold S, the fixed mounting plate 10
A fixed side template 102 is provided on the front surface (the right side in the figure) of 1. A sprue bush 107 on which a sprue 107a is formed is located on the fixed side mounting plate 101.
08. Sprue bush 107
Can be fitted with a nozzle (not shown) of an injection molding machine. In addition, the fixed side template S is provided with four guide pin bushes 109 (only one is shown).
Each of the four guide pins 110 (only one is shown) fixed to 03 is inserted.

In the movable mold T, the movable mounting plate 10
6, a spacer block 105 is fixed to the front surface (left side in the figure), a receiving plate 104 is provided on the front surface, and a movable mold plate 103 is further provided on the front surface. An ejector plate 111 is disposed in a space provided by the spacer block 105 between the movable-side mounting plate 106 and the receiving plate 104 of the movable-side mold T. Ejector plate 111
Is composed of an upper part 111a of the ejector plate on the parting line surface R side and a lower part 111b of the ejector plate on the side of the ejector rod 51 of the molding machine. An ejector pin 112, a return pin 113 and a sprue lock pin 114 are fixed to the ejector plate 111a. The ejector pins 112 are connected to the movable mold plate 10.
3 is supported by a core 115 fixed to the base 3 and penetrates the movable mold T to reach a cavity 116 formed in the parting line surface R. Return pin 113
Is pivotally supported by the movable mold plate 103 and reaches the parting line surface R. The sprue lock pin 114 is disposed at a position corresponding to the sprue 107a of the sprue bush 107, and the tip is formed in an undercut shape (not shown). A circular space 104a is formed in the receiving plate 104 around the return pin 113, so that the upper surface 111a of the ejector plate and the movable mold plate 1
The spring 113a is incorporated between the spring 113 and the spring 113.

[0005] At the center of the movable side mounting plate 106, a through hole 106a of the ejector rod 51 of the molding machine is provided. When the mold is opened (see FIG. 4), the ejector rods 51 protrude below the ejector plate 111 b, and the ejector pins 112 move the molded product 12
1, the sprue lock pin 114 projects the sprue resin 122, and both pins 112 and 11
4, the runner 119 is also protruded together (see FIG. 5). The molded article 121, the runner 119, and the sprue resin 122 are ejected by being chucked by a molded article removal robot (not shown) or the like in a protruded state. Then, when the ejector rod 51 is retracted, the ejector plate 111a is returned by the repulsive force of the compressed spring 113a incorporated in the return pin 113, and the ejector pin 112, the sprue lock pin 114, and the return pin 113 are retracted. Was adopted.

[0006]

In the conventional injection molding die apparatus, the ejector pins for ejecting and ejecting a molded product are moved forward and backward with respect to the parting line surface of the ejector plate. The ejector pin is ejected by the ejector rod of the molding machine protruding from the ejector plate and the ejector plate is moved forward. This is performed by retreating the ejector plate by the repulsive force of a spring incorporated between the ejector plate and the template.

As described above, conventionally, the retracting operation of the ejector pin relies on the repulsive force of the spring. Therefore, if an abnormality occurs in the mold apparatus and the ejector pin is restrained by a force larger than the repulsive force of the spring, the ejector pin is not pulled in, the molding operation is interrupted, and in the worst case, the mold is stopped. Had a risk of leading to breakage.

SUMMARY OF THE INVENTION It is an object of the present invention to ensure that the ejector pins protrude and retract.

[0009]

In order to achieve the above object, the present invention comprises a stationary mold and a movable mold,
The movable die is provided with a ejector plate which is driven by a molding machine ejector rod during mold opening, the ejector plate a space between the ejector plate
A support plate to be formed is provided.
There is a through hole through which
Between the support plate and the support plate.
To lock the ejector rod
Connected to the ejector plate and pulled out from between them.
The ejector rod and the ejector plate
The connection plate for releasing the connection of
You .

[0010] Preferably, a return pin which penetrates from the ejector plate to the parting line surface of the fixed mold and the movable mold and is fixed to the ejector plate, has a function of ejecting the ejector plate and the molded product at the time of projecting. A spring is incorporated between the ejector plate and the template in the driving direction.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 shows an injection mold apparatus according to the present invention. The injection mold apparatus includes a fixed mold P and a movable mold Q.
This mold is of a type in which a molded product is molded in a form combined with a runner or the like.

First, the fixed mold P will be described.

The fixed-side mold P is composed of a fixed-side mounting plate 1 and a fixed-side die plate 2, and the fixed-side die plate 2 is fixed to the front surface (the right side in the figure) of the fixed-side mounting plate 1. . A sprue bush 7 on which a sprue 7a is formed is mounted on the fixed-side mounting plate 1 via a locate ring 8. A nozzle (not shown) of an injection molding machine can be fitted to the sprue bush 7.

Further, four guide pin bushes 9 (only one is shown) are provided through the fixed mold plate 2, and four guide pins 10 (fixed to the movable mold plate 3). 1
(Only one shown).

Next, the movable mold Q will be described.

The movable-side mold Q includes a movable-side mounting plate 3, a receiving plate 4, a spacer block 5, and a movable-side mold plate 6, and is provided on the front surface (left side in the figure) of the movable-side mounting plate 6. Spacer block 5 is fixed, and receiving plate 4
However, the movable mold plate 3 is further fixed to the front surface thereof.

The movable-side mounting plate 6 and the receiving plate 4 of the movable-side mold Q
An ejector plate 11 is provided in a space provided by the spacer block 5 between the ejector plate 5 and the ejector plate 11. The ejector plate 11 has an ejector plate 11a on the parting line surface R side and an ejector rod 5 of a molding machine.
It is composed of two ejector plates 11b under one side. An ejector pin 12, a return pin 13, and a sprue lock pin 14 are provided on the ejector plate 11a.
Is stuck. The ejector pin 12 is mounted on the movable mold plate 3.
The movable side mold Q is supported by the core 15 fixed to the
To the cavity 16 formed in the parting line surface R. The return pin 13 is pivotally supported by the movable mold plate Q and reaches the parting line surface R. The sprue lock pin 14 is disposed at a position corresponding to the sprue 7a of the sprue bush 7, and the tip 14a is formed in an undercut shape.

At the center of the movable-side mounting plate 6, a window 6a penetrating the movable-side mounting plate 6 is provided. A support plate 17 is fixed to the center of the lower side 11b of the ejector plate on the movable mounting plate 6 side (right side in the figure). When the lower portion 11b of the ejector plate is in close contact with the movable-side mounting plate 6, the support plate 17 is accommodated in the window 6a provided on the movable-side mounting plate 6. The support plate 17 is a U-shaped plate, forms a space 17a between the support plate 17 and the lower portion 11b of the ejector plate, and has a through hole 17b at the center thereof so that the ejector rod 51 of the molding machine can pass therethrough. ing.

The ejector rod 51 of the molding machine has a groove 51a formed at its tip. When the groove 51a of the ejector rod 51 penetrates the window 6a of the movable-side mounting plate 6 and penetrates the through hole 17b of the support plate 17, the connecting plate 18 is connected to the support plate 17 and the ejector plate from above in the drawing. It is inserted in a space 17a formed between the lower plate 11b and the lower plate 11b, and is locked by a comb-shaped locking portion 18a formed in a lower portion of the connecting plate 18. Therefore, the ejector rod 51 of the molding machine and the ejector plate 11 of the movable mold Q are in a connected state. In addition,
Ejector rod 51 and ejector plate 1 of molding machine
1 and is easily coupled and released by venting difference's connection plate 18 is turned so performed.

Next, the operation of this embodiment will be described.

As shown in FIG. 1, when the fixed mold P and the movable mold Q are joined together, the fixed mold plate 2 is closed.
A cavity 16 is formed in the parting line surface R between the movable mold plate 3 and the movable mold plate 3. Then, the pellets fed from the hopper of the molding machine are advanced by the screw in the cylinder, and the heated and melted molding material forms the runner 19 from the nozzle through the sprue 7 a and flows into the cavity 16 from the gate 20. When the molding material in the cavity 16 is solidified, the parting line surface R is opened.
Then, the molding material is cut off from the nozzle of the molding machine at the sprue 7a, and the molded product 21, the runner 19 and the sprue resin 22 remain on the movable mold plate 3 side. On the other hand, after the opening operation of the parting line surface R is completed, the ejector rod 51 of the molding machine starts to protrude, and the ejector plate 11 connected by the operation of the ejector rod 51 moves forward. As the ejector plate 11 advances, the parting line surface R in which the ejector pin 12, the return pin 13, and the sprue lock pin 14 fixed to the ejector plate 11a are open.
, An ejection operation is performed. Ejector pin 12
Protrudes the molded product 21, the sprue lock pin 13 protrudes the sprue resin 22, and the two pins 12, 14
, The runner 19 is also protruded together. Molded product 21, runner 19 and sprue resin 22
In the protruded state, it is chucked and removed by a molded product removal robot (not shown) or the like. Then, when the ejector rod 51 is retracted, the ejector plate 11a is returned by the repulsive force of the compressed spring 13a incorporated in the return pin 13, and the ejector pin 12, the sprue lock pin 14, and the return pin 13 are retracted. Was adopted.

In the injection molding die apparatus of this embodiment, the upper surface 11 of the ejector plate to which the ejector pin 12 is fixed is attached.
Since a is directly connected to the ejector rod 51 of the molding machine, both the ejecting operation and the retracting operation of the ejector pin 12 can be reliably performed by the driving force of the ejector rod 51 of the molding machine.

In this embodiment, an example has been described in which the ejector plate 11 is moved forward and backward, that is, the ejector pin 12 is projected and retracted only by the driving force of the ejector rod 51 of the molding machine.
As in the conventional example, the ejector plate 11 is also used together with the repulsive force of the spring 113a (see FIG. 3) incorporated between the ejector plate 11 and the movable mold plate 3 using the return pin 13 in an auxiliary manner. May be moved forward and backward.

[0025]

According to the structure of the present invention, as in the prior art, in the ejecting operation and the retracting operation of the ejector pin, the retracting operation is performed by using the return pin inside the movable mold and the ejector plate and the movable mold. Not only by the repulsive force of the spring built into the plate, but also by the ejector pin's protruding operation as well as the retraction operation, which is performed using the driving force of the ejector rod of the molding machine. When the ejector pin is restrained by a force greater than the repulsive force of the spring due to the occurrence of an abnormality in the ejector rod, the retracting operation is reliably performed unless the ejector pin is greater than the retracting force of the ejector rod. Therefore,
The concern that the molding operation is interrupted due to abnormal ejector pin pull-in operation and that the worst case may be damage to the mold is also eliminated.

[Brief description of the drawings]

FIG. 1 is an injection mold apparatus showing one embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing details of connection between an ejector plate and an ejector rod of the molding machine of the injection mold apparatus shown in FIG. 1, wherein FIG. 2A is a view seen from above, and FIG. It is the figure seen from the machine side.

FIG. 3 is a view showing a conventional injection molding die apparatus.

FIG. 4 is a view showing a mold opening state of the injection mold apparatus shown in FIG. 3;

5 is a view showing a state in which the injection molding die apparatus shown in FIG. 3 projects a molded product in a mold open state.

[Explanation of symbols]

 P Fixed side mold Q Moving side mold R Parting line surface 11 Ejector plate 12 Ejector pin 13 Return pin 21 Molded product 51 Ejector rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/00-45/84 B29C 33/00-33/76

Claims (2)

(57) [Claims] The movable mold includes an ejector plate that is driven by an ejector rod of a molding machine when the mold is opened, and the ejector plate includes a mold. in the injection molding die device ejector pins are secured to and protrude through the movable mold in a state projecting moldings opening, a space is formed between the ejector plate in the ejector plate
A support plate is provided, and the support plate has a through hole through which the ejector rod passes.
Is provided between the ejector plate and the support plate.
Locked to the ejector rod by being inserted between
Being the above ejector rod and the above ejector plate
Are connected to each other, and the eject
Release the connection between the ejector plate and the ejector rod
Injection mold apparatus, wherein a connecting plate is provided that. 2. The injection molding die apparatus according to claim 1, wherein the projection penetrates from the ejector plate to a parting line surface between the fixed die and the movable die and is fixed to the ejector plate. An injection molding die apparatus, wherein a spring is incorporated between the ejector plate and a mold plate in a drive direction of the ejector plate when the molded product protrudes.