JPH05212760A - Mold device - Google Patents

Abstract

PURPOSE:To eliminate the troublesomeness of the work at the time of the replacement of a mold without generating interference between a gas suction pipe and the piping for a mold temp. controller. CONSTITUTION:A vent 35 is formed to a fixed mold 13 so as to communicate with a cavity 22 in order to discharge the air and gas in the cavity when the cavity is filled with a resin and the passage 51 in the fixed mold and the passage 52 in a fixed mold attaching plate 12 communicate with the vent 35 and the passage 53 in a fixed platen 11 is formed so as to communicate with the passage 52 in the fixed mold attaching plate and the passage 53 in the fixed platen 11 is opened to the surface of the fixed platen 11 to be allowed to communicate with a vacuum device. Therefore, by operating the vacuum device, the air and gas discharged to the vent 35 are sucked through the passages 51, 52, 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device.

[0002]

2. Description of the Related Art Conventionally, a resin melted by heating in a heating cylinder is filled under high pressure into a cavity of a mold, cooled and solidified in the cavity, and then the mold is opened to take out a molded product. In such an injection molding machine, when the resin is filled, the air in the cavity is compressed by the filling of the resin, which causes "burn" and "sink" in the molded product. Further, when the resin is filled into the cavity, the monomer component of the resin generates gas in the bent portion of the resin flow path up to the cavity, and the gas also runs along the tip of the resin along with the filling, and It causes "burn" and "sink".

Therefore, the air in the cavity and the gas generated by the resin at the time of filling are usually discharged to smooth the flow of the resin. That is, a vent is formed by a minute gap that communicates with the cavity by the land part, and air or gas is released into the atmosphere through the vent, or the vent is connected to a vacuum device, and the cavity is operated by operating the vacuum device. I try to suck the air and gas inside.

FIG. 2 is a schematic view of a conventional mold device. FIG. 1A is a cross-sectional view of the mold device, and FIG. 1B is a side view of the mold device. In the figure, 11 is a fixed platen, and a fixed mold 13 is attached to the fixed platen 11 via a fixed mold attachment plate 12. The nozzle of the injection device (not shown) advances through the hole 15 of the fixed platen 11 in the injection process, and the tip of the nozzle moves toward the sprue 1 of the fixed mold 13.
6 is contacted. The fixed die mounting plate 12 is provided with a locate ring 17 for positioning with respect to the fixed platen 11.

On the other hand, 18 is a movable platen, which is moved in the left-right direction in the drawing by a mold clamping mechanism (not shown) to bring the movable mold 19 into contact with and separate from the fixed mold 13. Therefore, the movable mold 19 is the movable mold mounting plate 2
0 and the spacer block 21 to move the movable platen 18
It is fixed to. Then, the resin injected from the nozzle passes through the runner (not shown) from the sprue 16 and is filled in the cavity 22 formed between the fixed mold 13 and the movable mold 19.

When the injection process is completed, the pressure-holding process is subsequently started, and the cooling of the resin is started. After a certain period of time, the molds 13 and 19 are opened with the molded product left on the movable mold 19 side. A molded product is ejected by the ejector pin 25. The ejector pin 25 has a head portion 27 at one end, and the head portion 27 is attached to the ejector plate 2
8 and 29 are supported by being clamped. The ejector pin 25 passes through the movable mold 19 and the other end faces the cavity 22.

Then, the ejector plates 28, 2 are
9 is disposed adjacent to the movable mold mounting plate 20 and by the ejector rod 33 on the injection molding machine side,
The structure is such that it moves in the direction of the movable mold 19. When the ejector pin 25 moves to the right in the figure, the ejector pin 25 moves to the right and the tip projects into the cavity 22 and the molded product can be dropped.

Further, 35 is a PL between the molds 13 and 19.
It is a vent formed on the (parting line) surface,
The vent 35 is open to the peripheral edge of the cavity 22 via a vent passage 36 extending through the movable mold 19. A pipe 37 is attached to the periphery of the movable mold 19 and connects the vent passage 36 to a vacuum device (not shown). Therefore, the air or gas in the cavity 22 can be sucked by the operation of the vacuum device (not shown).

In this case, the vent passage 36 is formed so as to penetrate through the movable mold 19, but it may be formed within the fixed mold 13. The ejector box 31 may be formed in both the movable mold 19 and the fixed mold 13. Further, the ejector box 31 has a closed structure, and one end of the vent passage 36 is communicated with the ejector box 31. Air and gas can be sucked from the entire molds 13 and 19 via.

[0010]

However, in the above-mentioned conventional mold apparatus, the vent passage 36 is fixed to the fixed mold 1.
3 and the movable mold 19 are formed so as to pass through the vent passage 36.
Is connected to a vacuum device (not shown) via a pipe 37 attached to the peripheral edge of the fixed mold 13 or the movable mold 19, so that the piping becomes complicated, and the piping for the mold temperature controller separately arranged. , And the injection device and the molded product take-out machine cause interference.

Further, in order to mold different kinds of molded products, it is necessary to detach the piping system such as the pipe 37 each time the molds 13 and 19 are exchanged, which makes the work complicated. The present invention solves the problems of the above-described conventional mold device, a pipe for sucking air or gas in the cavity, a pipe for a mold temperature controller, a mold clamping device, a molded product unloading machine, An object of the present invention is to provide a mold apparatus that does not cause interference with the covers and does not complicate the work of replacing the mold.

[0012]

Therefore, in the mold apparatus of the present invention, a fixed platen, a movable platen arranged to face the fixed platen, and a movable platen are arranged so as to come in contact with and separate from each other. It has a fixed mold and a movable mold that form a cavity between them, and a fixed mold mounting plate and a movable mold mounting plate for mounting the fixed mold and the movable mold on the fixed platen and the movable platen, respectively. ..

A vent is formed in at least one of the molds so as to communicate with the cavity, and air and gas in the cavity are discharged. The mold communication passage communicates with the vent and extends through at least one mold, and the mold attachment plate inner passage extends through at least one mold attachment plate, and the mold attachment plate inner passage faces the platen. Open on the surface to be used. Then, a platen internal passage is formed in the platen in communication with the mold mounting plate internal passage, and extends through the platen,
Open at the surface of the platen. The passage inside the platen is connected to a vacuum device.

Further, in the mold device having the ejector pin for ejecting the molded product, the ejector pin extends through the movable mold so that one end faces the cavity and the other end is fixed to the ejector plate. .. Also,
A sealed ejector box is formed between the movable mold and the mold mounting plate, and the ejector plate is housed in the ejector box.

An in-die passage and an in-die passage of the die passing through both dies and at least one of the die attachment plates are formed, one end of which opens into the ejector box and the other end of which faces the platen. Open on the surface to be used. An in-platen passage is formed in the platen so as to communicate with the in-die mounting plate passage, and is opened on the surface of the platen.

[0016]

According to the present invention, as described above, the fixed platen, the movable platen arranged so as to face the fixed platen, and the fixed metal arranged so as to come into contact with and separate from each other and form a cavity therebetween. It has a mold and a movable mold, and a fixed mold mounting plate and a movable mold mounting plate for mounting the fixed mold and the movable mold on the fixed platen and the movable platen, respectively. By moving the movable platen in the direction of the fixed platen, bringing the fixed mold and the movable mold into contact with each other, and filling the resin in the cavity, a molded product can be molded.

When the resin is filled, vents are formed in at least one of the molds communicating with the cavity so as to discharge air and gas in the cavity. A mold internal passage and a mold mounting plate internal passage are formed in communication with the vent, and a platen internal passage is formed in communication with the mold mounting plate internal passage, and the platen internal passage is formed on the surface of the platen. Open. Then, the passage inside the platen is communicated with the vacuum device.

Therefore, by operating the vacuum device, the air and gas discharged to the vent are sucked through the mold internal passage, the mold mounting plate internal passage and the platen internal passage. In a mold apparatus having an ejector pin for ejecting a molded product, the ejector pin extends through the movable mold, one end faces the cavity, and the other ejector plate is fixed to the ejector plate.

A sealed ejector box is formed between the movable mold and the mold mounting plate, and the ejector plate is housed in the ejector box. An in-die passage and an in-die attachment plate passage are formed, one end of which opens into the ejector box and the other end of which is connected to the in-platen passage.

Therefore, the air and gas in the cavity enter the ejector box through the through passage between the ejector pin and the die, and pass from the ejector box to the die passage, the die mounting plate passage and the platen passage. It is sucked by the operation of the vacuum device.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic view of a mold device showing an embodiment of the present invention. FIG. 1A is a cross-sectional view of the mold device, and FIG. 1B is a side view of the mold device. In the figure, 1
Reference numeral 1 denotes a fixed platen, and a fixed mold 13 is attached to the fixed platen 11 via a fixed mold attachment plate 12. The nozzle of the injection device (not shown) advances through the hole 15 of the fixed platen 11 in the injection process, and the tip of the nozzle is brought into contact with the sprue 16 of the fixed mold 13. The fixed die mounting plate 12 is provided with a locate ring 17 for positioning with respect to the fixed platen 11. In addition to the locate ring 17, a positioning block,
Positioning can be performed with a guide roller, a positioning pin, or the like.

On the other hand, 18 is a movable platen, which is moved in the left-right direction in the drawing by a mold clamping mechanism (not shown) to bring the movable mold 19 into contact with and separate from the fixed mold 13. Therefore, the movable mold 19 is the movable mold mounting plate 2
0 and the spacer block 21 to move the movable platen 18
It is fixed to. Then, the resin injected from the nozzle passes through the runner (not shown) from the sprue 16 and is filled in the cavity 22 formed between the fixed mold 13 and the movable mold 19.

When the injection step is completed, the pressure-holding step is subsequently started, and the cooling of the resin is started. After a certain period of time, both molds 13 and 19 are opened with the molded product left on the movable mold 19 side. A molded product is ejected by the ejector pin 25. The ejector pin 25 has a head portion 27 at one end, and the head portion 27 is attached to the ejector plate 2
8 and 29 are supported by being clamped. The ejector pin 25 extends through the ejector box 31 formed by the spacer block 21 and further through the movable mold 19, and has the other end at the cavity 22.
Face in.

Then, the ejector plates 28, 2
9 is disposed adjacent to the movable mold mounting plate 20 and by the ejector rod 33 on the injection molding machine side,
The structure is such that it moves in the direction of the movable mold 19. When the ejector pin 25 moves to the right in the figure, the ejector pin 25 moves to the right and the tip projects into the cavity 22 and the molded product can be dropped.

By the way, in the mold apparatus of the present invention,
The air and gas in the cavity 22 can be sucked by the operation of a vacuum device (not shown).
Therefore, the vent 35 is formed on the PL (parting line) surface between the molds 13 and 19. Then, a fixed mold internal passage 51 is formed in the fixed mold 13 so as to communicate with the vent 35. Further, a fixed mold mounting plate inner passage 52 is provided at a position of the fixed mold mounting plate 12 corresponding to the fixed mold inner passage 51, and is communicated with the fixed mold inner passage 51. On the other hand, a fixed platen internal passage 53 is formed at a position of the fixed platen 11 corresponding to the fixed mold mounting plate internal passage 52, and is communicated with the fixed mold mounting plate internal passage 52.

The fixed mold mounting plate 12 has two molds 13,
Fixed platen 1 together with fixed mold 13 when replacing 19
Since it is detached from No. 1, the space between the fixed mold mounting plate internal passage 52 and the fixed platen internal passage 53 is sealed by packing 55 or the like. Reference numeral 57 denotes a valve unit which is connected to the fixed platen internal passage 53 and is attached to the peripheral edge of the fixed platen 11 to switch and connect the fixed platen internal passage 53 to either a vacuum device or the atmosphere (not shown). An electromagnetic valve or an air operated valve is used for the valve unit 57. When an air-operated valve is used, it is operated by supplying control air from electromagnetic valves arranged at separate locations.
Therefore, the switching operation of the valve unit 57 can be stabilized even when a magnetic material such as a plastic magnet is used.

Reference numeral 58 is a hose that connects the valve unit 57 and a vacuum device (not shown). FIG. 3 is a schematic view of a mold apparatus showing a second embodiment of the present invention. Figure (a)
[Fig. 3] is a cross-sectional view of the mold device, and (b) is a side view of the mold device. In this case, the inside of the ejector box 31 formed by the spacer block 21 has a closed structure.
A vent 35 is formed on the PL surface between the molds 13 and 19, and a fixed mold passage 60 is provided in the fixed mold 13 so as to communicate with the vent 35, and a movable mold is provided in the movable mold 19. An in-mold passage 61 is formed. Therefore, the air or gas in the cavity 22 is simply sucked by the operation of the vacuum device (not shown) through the vent 35, the fixed mold internal passage 60, the fixed mold mounting plate internal passage 52, and the fixed platen internal passage 53. Instead, through the passage 62 of the ejector pin 25, the ejector box 31, the movable mold internal passage 61, the fixed mold internal passage 60, the fixed mold attachment plate internal passage 52, and the fixed platen internal passage 53, the mold 13 , 19 can be sucked from the whole.

As described above, since the valve unit 57, the hose 58 and the vacuum device (not shown) can be always connected to the fixed platen 11, both the molds 13 and 19 can be connected.
When replacing the two molds 1 for the fixed platen 11
At the same time as the positioning of 3, 19 is completed, the positioning between the mold inner passages 60, 61 and the fixed platen inner passage 53 can be completed, and the work can be simplified.

The valve unit 57 and the hose 58 can be attached to both the fixed platen 11 and the movable platen 18, but when attached to the fixed platen 11, the hose 58 does not slide on the floor or the like. Further, the passage 53 in the fixed platen is connected to the fixed platen 11
A plurality of molds can be accommodated by providing a plurality of them inside and opening at various places on the surface facing the fixed mold mounting plate 12.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention.

[0031]

As described in detail above, according to the present invention, a vent is formed in at least one of the molds so as to communicate with the cavities between the molds, and communicate with the vent to provide a mold internal passage and The mold mounting plate internal passage communicates with the mold mounting plate internal passage to form a platen internal passage. Then, the passage in the platen is opened on the surface of the platen and communicated with the vacuum device.

Therefore, by operating the vacuum device, the air and gas in the cavity are vented,
Suction is performed through the in-die passage, the die mounting plate passage, and the platen passage. In the case of a mold device having an ejector pin for ejecting a molded product, air and gas in the cavity can utilize a path that enters the ejector box through a gap between the ejector pin and the mold,
It is sucked from the ejector box through the passage in the die, the passage in the die mounting plate and the passage in the platen by the operation of the vacuum device.

Therefore, it is not necessary to attach a piping system for sucking the air or gas in the cavity to the mold, so that the pipe for the mold temperature controller, the mold clamping device, the molded product unloading machine, the covers, etc. There is no interference between them. Further, even when exchanging the mold, it is not necessary to detach the hoses connecting the platen and the vacuum device, and at the same time when the mold mounting plate is attached to the platen, the connection between the cavity and the vacuum device is completed. Work cost is reduced.

[Brief description of drawings]

FIG. 1 is a schematic view of a mold device showing an embodiment of the present invention.

FIG. 2 is a schematic view of a conventional mold device.

FIG. 3 is a schematic view of a mold device showing a second embodiment of the present invention.

[Explanation of symbols]

 11 Fixed Platen 12 Fixed Mold Mounting Plate 13 Fixed Mold 18 Movable Platen 19 Movable Mold 20 Movable Mold Mounting Plate 22 Cavity 25 Ejector Pins 28, 29 Ejector Plate 31 Ejector Box 35 Vent 51, 60 Fixed Mold Passage 52 Fixed die mounting plate inner passage 53 Fixed platen inner passage 61 Movable inner die passage

Claims (2)

[Claims] 1. A fixed platen, (b) a movable platen arranged so as to face the fixed platen, and (c) a fixed platen which is arranged so as to come into contact with and separate from each other and forms a cavity therebetween. A mold and a movable mold; and (d) a fixed mold mounting plate and a movable mold mounting plate for mounting the fixed mold and the movable mold on the fixed platen and the movable platen, respectively.
(E) A vent that communicates with the cavity and is formed in at least one of the molds to discharge air and gas in the cavity, and (f) communicate with the vent, and at least one mold and mold attachment. A mold internal passage and a mold mounting plate internal passage which are formed through the plate and open on the surface facing the platen; and (g) are formed in the platen so as to communicate with the mold mounting plate internal passage, A passage in the platen that extends through the platen and opens at the surface of the platen;
A mold apparatus having a vacuum device communicating with the passage in the platen. 2. A fixed platen (a), a movable platen (b) arranged so as to face the fixed platen, and (c) a fixed platen so as to come into contact with and separate from each other and form a cavity therebetween. A mold and a movable mold; and (d) a fixed mold mounting plate and a movable mold mounting plate for mounting the fixed mold and the movable mold on the fixed platen and the movable platen, respectively.
(E) An ejector pin that extends through the movable mold and one end of which faces the inside of the cavity; (f) an ejector plate that fixes the other end of the ejector pin; (g) the movable mold and mold attachment. A sealed ejector box formed between the plates and containing the ejector plate,
(H) a mold internal passage and a mold mounting plate internal passage which are formed in the ejector box and are formed so as to penetrate through both molds and at least one mold mounting plate and open on the surface facing the platen. (I) a platen internal passage that is formed in the platen in communication with the mold mounting plate internal passage, extends through the platen, and opens at the surface of the platen;
(J) A mold apparatus having a vacuum device communicating with the passage inside the platen.