JP2667995B2 - 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 molding die device of a type in which a molded product is ejected from a cavity by using an ejector pin.

[0002]

2. Description of the Related Art In a conventional injection molding die apparatus, as a method of discharging a molded product from a die at the end of molding, a method of ejecting a molded product from a cavity using an ejector pin is employed. For small molded products that are difficult to drop just by pushing it down, use the air blowing means installed above the mold when ejecting the ejector pin.
It was blowing down with more air.

[0003]

According to the conventional configuration,
On the relationship between disposed d A spray can with means outside of the mold apparatus, bulky injection mold apparatus, including the air blowing means, also, because the air injected diffuses extensively , The blown-off molded product has scattered, and some fall into the molded product collection space as intended,
Some things fly away from the ejector pin but fly out of the molded product collection space, or, in the worst case, the parting line surface of the mold (hereinafter, P
However, there is a problem in that it adheres to the (L surface) and the molding is continued without being able to detect the adhesion of the molded product, which leads to damage to the mold.

[0004] It is therefore an object of the present invention to reduce the size of an injection mold apparatus having a device for blowing off a molded product with air when the mold is opened, and to improve the reliability of molded product recovery.

[0005]

In order to achieve the above object, the present invention comprises a stationary mold and a movable mold,
The movable mold has an ejector plate that is driven by an ejector rod of the molding machine when the mold is opened, and an ejector pin that sticks through the movable mold to project the molded product when the mold is opened is fixed to the ejector plate. In the injection molding mold apparatus described above, the movable mold is fixed to the movable mounting plate, and a fixed through shaft extends through the through hole provided in the ejector plate and the ejector pin to the cavity. When the ejector pin penetrates and protrudes from the movable mold in the mold open state, it comes out of the fixed penetrating shaft in the fixed state, forms an air passage inside, and Has an air injection port for injecting air to the molded product that is in communication with the air passage and is ejected by the ejector pin.The ejector pin has an ejector pin. An air intake is provided in the middle side surface of the through hole of the air inlet, and the air intake is provided in the movable mold only when the ejector pins protrude from the movable mold when the mold is opened. The ejector pin is located at a position communicating with the supply path, and the inside of the ejector pin communicates with the air intake port to the air injection port.

[0006]

DETAILED 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.

As shown in FIG. 1, the injection mold apparatus according to the present invention is roughly divided into a fixed mold P and a movable mold Q.
It is constituted by and.

The fixed mold P will be described. The fixed side mounting plate 1 which is fixed by the mounting holes 1a in the injection molding machine body, not shown, sprue Bed <br/> Mesh 2 sprue 2a is formed is attached via a locating ring 3.
A nozzle (not shown) of an injection molding machine is fitted to the sprue bush 2. In addition, the fixed side mounting plate 1 has 4
Two support pins 4 are fixed (only one is shown). The distal end of the sprue bush 2 is
It is supported by runner stripper plate 5 which is in contact with the front surface of. The front of the runner stripper plate 5, the fixed-side mold plate 6 abuts. Runner
The stripper plate 5 and the fixed-side mold plate 6 are guided by the support pins 4 by guide bushes 7a and 7b provided respectively, and the fixed-side mold plate 6 is fixed by a limiting bolt 8 connected to the movable mold Q. , runner stripper
The plate 5 is also limited by a similar limiting bolt (not shown) to follow the movement of the movable-side die Q and to limit the separation distance between each of them when the die is opened.

A guide pin 9 is fixed to the front surface of the fixed mold plate 6 for aligning with the movable mold plate 13 when the mold is clamped. A cavity (not shown) is formed on the front surface of the fixed mold plate 6, and is combined with a cavity 13a (FIG. 2) of the movable mold plate 13 to be described later by mold clamping to form a cavity of the molded product W. To form a section. A runner portion (not shown) is provided on the back surface of the fixed-side template 6, and the runner portion extends from the back surface toward the front surface of the fixed-side template 6. squeezed to form a gate (not shown). The runner portion that is provided on the back surface of the fixed mold plate 6 is fixed to the stationary side mounting plate 1, runner scan
The tip of a runner lock pin (not shown) provided through the tripper plate 5 protrudes.

The movable die Q will be described. As shown in FIG. 1, the movable-side mold Q includes a movable-side mold mounting plate 10 fixed to a cylinder rod of a molding machine ( not shown) by a mounting hole 10a, and a spacer on the front surface (the left side in FIG. 1). The block 11 has a receiving plate 12 on its front surface, and a movable mold plate 13 on its front surface. The blocks 14 are fixed to each other by bolts 14. Movable mold Q
The guide bush 1 provided on the movable mold plate 13
The guide pin 9 guides the guide pin 9 of the fixed mold P so that it can move forward and backward with respect to the fixed mold P. The movable die Q is provided with an ejection mechanism. In the protruding mechanism, an ejector pin 17 fixed to an ejector plate 16 composed of two plates 16a and 16b is accommodated in a space formed inside the spacer block 11. A return pin 19 is fixed to the ejector plate 16, and a compression coil spring 20 is provided between the ejector plate 16 and the movable mold plate 13 around the return pin 19.
It is biased toward the movable side mounting plate 10 side . Further, the fixed through shaft 18 is fixed to the movable side fixed plate 10 by the fixed through shaft mounting plate 18.
It is attached by a and is in a fixed state. Fixed through shaft 1
8 is an ejector plate 16 and an ejector pin 1
7 to the above-mentioned cavity 13a.

2 and 3, the ejector plate 1 is shown.
6 shows details of an ejector pin 17 fixed to 6 and a cavity 13a of a fixed through shaft 18. FIG. 2 shows a state before the protrusion, and FIG. 3 shows a state after the protrusion.

From the ejector plate 16 to the receiving plate 12,
The ejector pins 17 provided through the movable mold plate 13 extend to the cavity 13 a of the movable mold plate 13. The ejector pin 17 has a through hole 17a penetrating from the mounting portion of the ejector plate 16, but is a stepped hole, and the diameter of the hole (air injection port) 17b on the side of the cavity 13a is small. Further, an air inlet 17c is provided in an intermediate side surface of the through hole 17a. On the other hand, in the movable mold plate 13, an air supply passage 13b is provided.
Is guided from the outside of the movable mold plate 13 and the ejector pin 1
An air supply branch 13c exists at the position 7.

[0013] movable side mounting plate 10 from the ejector plate 16 and ejector pin 17 fixed through shaft 18 provided through the is fixed to the movable Mounting side plate 10 regardless of the operation of the ejector plate 16. The fixed penetrating shaft 18 is a stepped shaft, and the small-diameter shaft portion 18a at the tip and the other shaft portions have holes (17a, 17b) of the ejector pin 17.
The fitting is made with high precision. The ejector plate 16 is retracted, that is, the ejector pin 1
If 7 is retracted, ejector pin 1
7 and the tip portion 18b of the fixed through shaft 18
, The cavity 13a is completely sealed,
In this state, the resin material is injection molded. And, when the ejector plate 16 is advanced, that is, when the ejector pin 17 is protruded, only the ejector pin 17 is protruded and the fixed through shaft 18 remains as it is. An air passage 17 e is formed inside the ejector pin 17.

Here, the operation of the mold apparatus having the above-described configuration will be described. The movable mold Q is moved forward by a cylinder rod of a molding machine ( not shown) to perform mold clamping. Then, the fixed side mold plate 6 and the movable side mold plate 13
Is closed and the respective cavities are united to form a cavity for a molded product on the PL surface of the mold apparatus. Next, the resin material heated and melted by the injection molding machine is jetted from the nozzle and filled in the cavity through the sprue 2a, the runner portion and the gate. After a lapse of a predetermined time, the molding material in the cavity is cooled. After completion of cooling, the mold opening is started, runner stripper pre
First opening between the fixed die plate 6 and over bets 5 with a force of such a spring (not shown), runner weakest since attracted La <br/> runner over the stripper plate 5 by a runner lock pin It is cut at the gate. When the mold opening further proceeds, the PL surface is opened by the limit bolt, and the molded product W can be taken out. Here, the molded product W needs to remain in the cavity 13a of the movable mold plate 13. Further mold opening runner drop unit and the product falling portion mold opening of becomes restricted fill progresses, Runner stripper plate 5 is pulled forcibly release the coupling portion of the runner lock pin and runner. At this time, the runner is dropped using the power of a runner protruding device (not shown). After mold opening completion, the ejector rod forming machine enters from hole 21, this Eji
Ejector plate 16 is advanced to retain the ejector pins 17 by the pressing of Ekuta rod, moldings W adhering to the eject a molded product W at the same time the ejector pin head portions 17d from the air injection port 17b of the ejector pin 17 to drop by kicking with a blow in the air.

When the molded product W is dropped from the mold, only the ejector pins 17 are provided on the ejector plate 16 and
There is no problem if the molded product W falls just by pushing the molded product W with the ejector pins 17 when the mold is opened. However, in general, a small molded product W is protruded from the ejector pin tip 1
It does not fall while it is attached to 7d. Therefore, as shown in FIG. 3, an ejector pin 17 is provided on the ejector plate 16, a fixed through shaft 18 is further provided inside the ejector pin 17, and an air passage formed inside the ejector pin 17 when the ejector pin 17 protrudes. 17e, the air inlet 17c is connected to the air supply passage 13b of the movable mold plate 13.
The problem is solved by allowing the air to flow in communication with the air supply branch 13c and to be ejected from the air ejection port 17b of the ejector pin tip portion 17d.
Since the injection of the air is not a method of vaguely blowing the molded product W protruded by the ejector pins 17 from above the mold as in the related art, it is difficult for the molded product W to scatter and cause the above-described problem. Absent. Further, the ejector pin 17 moves backward with the retreat of the ejector plate 16, and the air inlet 17 c of the through hole 17 a of the ejector pin 17 communicating with the air supply branch 13 c is displaced from the air supply branch 13 c and the air is released. Supply is cut off.

Then, the mold clamping is started again, the PL surfaces of the fixed mold plate 6 and the movable mold plate 13 are closed, and the above operation is repeated.

As described above, since the air is surely jetted to each of the molded products W, the blown molded products W fall into the molded product collection space without being scattered.

[0018]

[Other Embodiments] In the above embodiment, the air inlet 17 provided in the through hole 17a of the ejector pin 17 is provided.
c communicates with the air supply passage 13c only when the ejector plate 16 advances. However, when the ejector plate 16 is retracted, the ejector pin 17 is completely retracted into the movable mold plate 13, and the small-diameter portion 18 a of the fixed penetrating shaft 18 is fitted into the air injection port 17 b of the ejector pin 17. Therefore, the air inlet 17c is provided over a wide range of the through hole 17a without allowing the air inlet 17c to communicate with the air supply branch 13c only when the ejector pin 17 projects when the mold is opened. Therefore, there is no problem even if air is always supplied to the air passage 17e.

[0019]

According to the effects of the present invention, since the present invention can be implemented in a general-purpose mold mechanism by a built-in method, there is no need to provide a robot or the like for blowing down a molded product, thereby reducing production equipment costs. , it is possible to reduce the installation space of the whole injection molding system including an air blowing with means. Also,
The possibility of mold breakage is greatly reduced due to the reliable dropping of the molded product, resulting in a reduction in molding stoppage and shortening of molding time. As a result, the reliability of falling of the molded product is further improved.

[Brief description of the drawings]

FIG. 1 is a main sectional view of an injection molding die apparatus of the present invention.

FIG. 2 is a cross-sectional view showing details of an ejector pin and a fixed through shaft when the mold is clamped.

FIG. 3 is a cross-sectional view showing details of an ejector pin and a fixed through shaft when the mold is opened.

BRIEF DESCRIPTION OF THE REFERENCE NUMERALS 10 Movable mounting plate 13a Cavity part 13b Air supply path 16 Ejector plate 17 Ejector pin 17a Through hole 17b Air injection port 17c Air intake 17d Protruding end of ejector pin (ejector pin tip) > End ) 17e Air passage 18 Fixed through shaft P Fixed side mold Q Movable side mold W Molded product

 ──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-57-43848 (JP, A) JP-A 63-3420 (JP, U) JP-A 62-109919 (JP, U) JP-A 61- 127855 (JP, U) Japanese Utility Model Showa 60-138724 (JP, U) Japanese Utility Model Showa 52-27968 (JP, U)

Claims (1)

(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 fixed to eject the molded article protrude through the movable mold in an open state, the above-mentioned movable side mold is fixed to the Mounting movable plate, the ejector plate And a fixed through shaft extends through the through hole provided in the ejector pin up to the cavity, and the ejector pin is fixed in the fixed state when the ejector pin projects through the movable mold in the mold open state. When the ejector pin comes out of the through shaft, an air passage is formed inside, and the protruding end of the ejector pin communicates with the air passage and is projected by the ejector pin. An air injection port for injecting air into the molded product in the ejected state is provided. The ejector pin is provided with an air intake at an intermediate side surface of a through hole of the ejector pin. The inlet is located at a position communicating with the air supply path provided in the movable mold only when the ejector pins protrude from the movable mold in the mold open state, and the inside of the ejector pins is An injection mold apparatus, wherein the apparatus is in communication with the air inlet from the inlet.