JPH0938980A - Molding equipment for molding - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To facilitate cleaning around a gas vent formed between core inserts. SOLUTION: The protruding mechanism of the movable die 2 is a two-stage protruding mechanism 26. A first ejector plate 27 with product ejector pins 29 pushes against a second ejector plate 28 with core ejector pins 30. The core ejecting pin 30 ejects one of the adjacent core inserts 17a, ..., 17d forming a gas vent. At the time of molding, the second protruding plate 28 is
Keep it stationary. [Effect] It is not necessary to disassemble the entire movable mold 2 for cleaning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die device, and more particularly, to a structure for cleaning a mold body.

[0002]

For example, in injection molding of a thermoplastic resin, a fixed mold and a movable mold of a mold are closed to form a cavity having a product shape between the fixed mold and the movable mold. After filling the inside with a thermoplastic resin which is heated and melted, the resin is cooled and solidified to form a product. By the way, when the cavity is filled with the resin, the air and the gas of the resin must be discharged from the cavity, and for that reason, a gas vent is formed in the mold. As this gas vent, a concave groove formed on the abutting surface of the fixed die and the movable die, for example, a cavity in which a cavity is formed by a plurality of nests in the movable die and a gap between these nests is used, or a die For example, there is one that uses an ejection pin for ejecting a molded product when opened.

As described above, resin gas is generated during molding, but this gas pollutes the mold. This dirt is highly viscous and adheres to the mold. Further, when the contamination with gas progresses, the gas vent is clogged, and it becomes difficult for the gas to escape from the cavity, which may result in poor resin filling balance or defective molding such as burning or warping. Therefore, it is necessary to clean the mold from time to time to remove the contamination of the resin with the gas.

The split surface between the fixed die and the movable die can be cleaned simply by opening the die. However, the gas vent formed between the nests cannot be cleaned without disassembling the mold itself. In the conventional mold device, the movable mold cannot be removed without disassembling the movable mold as a whole, and cleaning is very troublesome.

As described above, in the conventional die apparatus, when a gas vent is formed between die body members such as a nest with one die body such as a movable die, the die itself is used to clean the gas vent. Had to be disassembled significantly, and there was a problem that cleaning was troublesome.

The present invention is intended to solve such a problem, and even when a gas vent is formed between a plurality of mold body members in one mold body, molding around the gas vent can be easily cleaned. An object is to provide a mold device for use.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 is provided with a plurality of molds which are opened and closed to form a product-shaped cavity between them when the molds are closed. An ejecting mechanism for ejecting the formed and formed product when the die is opened and releasing the die. The die body provided with the ejecting mechanism has a plurality of die body members forming cavities. In the molding die device in which a gas vent that communicates the cavity to the outside of the mold body is formed by the gap of, the plurality of mold body members are slidably movable with respect to each other in the projecting direction by the projecting mechanism, and the projecting mechanism is As a two-stage ejecting mechanism, one of the adjacent mold body members forming a gas vent is ejected by ejecting the product by the first ejecting. That.

According to a second aspect of the present invention, in the molding die apparatus according to the first aspect of the present invention, the ejection mechanism includes a first ejection plate having a product ejection pin for ejecting a product, and a die for ejecting the mold member. A second ejecting plate having a body member ejecting pin, both of these ejecting plates being independently movable in the same direction with respect to the base body of the mold body provided with the ejecting mechanism, and the first ejecting plate. Is configured to push a second protrusion plate located closer to the cavity than the first protrusion plate, and a stopper for releasably locking the second protrusion plate to the base is provided on the base. It is provided.

In the molding die apparatus of the first aspect of the present invention, during molding, a plurality of mold bodies are closed and the cavity formed between these mold bodies is filled with the molding material. At this time,
The gas in the cavity is discharged to the outside of the mold through the gas vent formed by the gap between the plurality of mold members. After the molding material filled in the cavity is solidified, the mold is opened and the molding material solidified in the cavity, that is, the product is taken out. At this time, the two-stage ejection mechanism ejects the product by the first ejection and separates it. Shape. Further, when cleaning around the gas vent between the mold body members, the second-stage protrusion mechanism is caused to further perform the second-stage protrusion. As a result, one of the adjacent mold body members forming the gas vent is projected, and the surrounding area can be cleaned. In addition, the mold member itself may be removed and cleaned, but this is
This is possible because a step is formed between adjacent mold body members. It should be noted that, at the time of molding, the second stage ejecting mechanism is not allowed to perform the second stage protrusion so that the mold member is not protruded.

Further, in the molding die device according to the second aspect of the present invention, at the time of molding, the product ejecting pin of the first ejecting plate ejects the molded product. At this time, the first protruding plate can move until it hits the second protruding plate, but the second protruding plate is locked to the base of the mold body by the stopper and does not move. On the other hand, when cleaning around the gas vent between the mold body members, the locking by the stopper is released. As a result, the first protruding plate becomes the second protruding plate.
Of the second die plate and the die body member ejector pins of the second die plate eject one of the adjacent die body members forming the gas vent.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the molding die apparatus of the present invention will be described below with reference to the drawings. In the drawing, 1 is a fixed die, 2 is a movable die, and these fixed die 1 and movable die 2 forming a pair of mold bodies move in the left-right direction in the drawing to open and close each other, and when the mold is closed, the product shape The cavity 3 is formed. The fixed mold 1 shows only a part of the fixed-side mold plate 4, but it is attached to the fixed-side platen of the molding machine, and the sprue to which the nozzle of the molding machine is connected and the sprue are connected to the cavity 3 It has a runner that communicates with.

The movable die 2 includes a movable side attachment plate 11 attached to a movable side platen of a molding machine, and a movable side spacer block 12 fixed to a peripheral portion of a surface of the movable side attachment plate 11 on the fixed die 1 side. , A base by a movable side receiving plate 13 fixed to a surface of the movable side spacer block 12 on the fixed mold 1 side, and a movable side mold plate 14 fixed to a surface of the movable side receiving plate 13 on the fixed mold 1 side. Are configured. The movable side mold plate 14 also serves as a mold member that forms the cavity 3.

The movable side mold plate 14 is formed with a fitting hole 16 which opens toward the fixed mold 1, and inside the fitting hole 16, a plurality of mold body members for forming the cavities 3 are formed. The core inserts 17a, 17b, 17c, 17d are closely aligned and fitted. Fitting hole 16 and core inserts 17a, 17b, 17c, 17
The side surface of d is the opening / closing direction of the fixed die 1 and the movable die 2 (hereinafter,
The mold side is parallel to the mold opening and closing direction), and the movable side mold plate 14 and the core inserts 17a, ..., 17d and the core insert 17a,
…, 17d are not fixed to each other. This allows
The core inserts 17a, ..., 17d are slidably movable with respect to the movable side mold plate 14 and in the mold opening / closing direction, and also removable. Then, due to the partial minute gaps between the plurality of core inserts 17a, ..., 17d,
A gas vent 18 is formed that connects the cavity 3 to the outside of the fixed mold 1 and the movable mold 2. A gas reservoir 19 for reducing the flow resistance of gas is formed between the core inserts 17a, ..., 17d in communication with the gas vents 18. Furthermore, in the movable side template 14 and the movable side receiving plate 13,
A gas passage 20 that connects the gas vent 18 between the core inserts 17a, ..., 17d to the outside air is formed.

Although not shown, the core insert 17
In addition to the gas vent 18 between a, ..., 17d, the cavity 3 is fixed between the fixed mold 1 and the movable mold 2 which are closed by a minute gap between them. 2 A gas vent that communicates with the outside is formed.

Further, the movable die 2 has a two-stage protruding mechanism.
26 are provided. The two-stage protruding mechanism 26 is a first block supported inside the spacer block 12 by the movable side mounting plate 11 and the movable side receiving plate 13 so as to be movable in the mold opening / closing direction.
It has a protruding plate 27 and a second protruding plate 28. Both of the protruding plates 27 and 28 are movable independently of each other, but the first protruding plate 27 pushes the second protruding plate 28 located closer to the cavity 3 than the first protruding plate 27. The product ejection pin 29 is fixed to the first ejection plate 27. This product eject pin 29
Is a movable side receiving plate 13, a movable side template 14, and a core insert 17b.
Is slidably pierced, and the tip is positioned so as to face the cavity 3. Further, a core ejecting pin 30 as a mold member ejecting pin is fixed to the second ejecting plate 28. The core ejecting pin 30 slidably penetrates through the movable-side receiving plate 13 and the movable-side mold plate 14, and its tip abuts the surface of the core inserts 17a, 17c opposite to the fixed mold 1. . Of the two adjacent core inserts 17a, ..., 17d forming the gas vent 18 between each other, only one of the core ejecting pins 30 abuts.

The position of the first protruding plate 27, which abuts on the movable side mounting plate 11, is the limit position of movement in the direction (returning direction) opposite to the fixed mold 1. Further, a step surface 31 facing the fixed mold 1 side is formed on the inner side surface of the movable side spacer block 12, but the second protruding plate 28 has a position where it abuts on the step surface 31 in the returning direction. It is at the limit of movement. Along with this, the second protruding plate 28 is sandwiched by the step surface 31 in the stopper mounting portion 32 formed on the movable side spacer block 12, the movable side receiving plate 13, etc., and the second protruding plate 28 is A stopper 33 that engages with the movable side spacer block 12 and the movable side receiving plate 13 is detachably attached. Further, between the first protruding plate 27 and the movable side receiving plate 13, the movable side receiving plate 13
On the other hand, a first return spring 34 that pushes the first protruding plate 27 in the returning direction is attached. A return pin 35 fixed to the first protruding plate 27 slidably penetrates through the second protruding plate 28, the movable side receiving plate 13, and the movable side mold plate 14. Further, between the second protruding plate 28 and the movable side receiving plate 13, the second side with respect to the movable side receiving plate 13 is provided.
A second return spring 36 that pushes the protruding plate 28 of FIG.

Reference numeral 41 denotes an ejecting rod provided on the molding machine side. The ejecting rod 41 is driven by a hydraulic cylinder or the like to push the first ejecting plate 27 toward the fixed mold 1.

At the time of normal molding, as shown in FIGS. 1 and 2, in the movable die 2, the stopper 33 is attached to the stopper mounting portion 32, and the second protruding plate 28 is the base of the movable die 2, that is, the movable side receiving plate. Keep it immobile with respect to 13.

Then, as shown in FIG. 1, the fixed mold 1 and the movable mold 2 are closed, and a cavity 3 formed between the fixed mold 1 and the movable mold 2 is injected from a nozzle of a molding machine. Fill the material with a molten thermoplastic resin. At the time of this filling, the air and the resin gas in the cavity 3 are
, 17d through the gas vents 18 and the gas vents formed between the fixed mold 1 and the movable mold 2,
It is discharged outside the fixed mold 1 and the movable mold 2.

Further, after the resin filled in the cavity 3 is sufficiently cooled and solidified, as shown in FIG. 2, the fixed mold 1 and the movable mold 2 are opened to solidify the resin in the cavity 3. That is, the molded product P is taken out. As the mold is opened, the product P is fixed to the fixed mold 1 due to the difference in the mold release resistance.
Move away from Then, the ejecting rod 41 pushes the first ejecting plate 27, so that the first ejecting plate 27 moves against the first return spring 34 toward the fixed mold 1 with respect to the base of the fixed mold 2. . Along with this, the product ejecting pin 29 ejects the product P and releases it from the movable mold 2.

The first protruding plate 27 is the second protruding plate 28.
You can move it until you hit it, but this second ejection plate
Since the stopper 28 is locked to the base of the movable mold 2 by the stopper 33, the first protruding plate 27 cannot move any further. Therefore, the core inserts 17a and 17c do not move with respect to the movable side mold plate 14. The operation of the first ejecting plate 27 until it hits the second ejecting plate 28 is the first ejecting operation of the two-stage ejecting mechanism 26.

Thereafter, the mold is closed again, and the above molding process is repeated. When the mold is closed, the protruding rod 41
As is returned, the first return spring 34 pushes and the first protruding plate 27 also returns. Further, when the mold closing is completed, the position of the first protruding plate 27 is reliably regulated by the return pin 35 hitting the fixed mold 1.

By the way, the gaps between the core inserts 17a, ..., 17d forming the gas vent 18 are contaminated by condensation and adhesion of resin gas. Therefore, if the dirt has progressed to some extent, the molding is stopped and the area around the gas vent 18 is cleaned. At the time of this cleaning, in the movable die 2, the stopper 33 is removed from the stopper mounting portion 32 and the engagement with the second protruding plate 28 is released. In this state, the die is opened, and the first rod is pushed out by the rod 41.
When 27 is pushed, first of all, only the first ejecting plate 27 and the product ejecting pin 29 are fixed mold 1 as in the molding.
Move to. However, as shown in FIG. 3, when the first protruding plate 27 hits the second protruding plate 28, the second protruding plate 28 is not locked this time, so When pushed, the second ejection plate 28 also moves toward the fixed mold 1. Along with this, the core protrusion pin 30 fixed to the second protrusion plate 28 is inserted into the core insert 17a,
Stick out 17c. The operation of the second ejecting plate 28 is the second ejecting operation of the two-stage ejecting mechanism 26.

Projected by the core ejector pin 30 is any adjacent two that form a gas vent 18 between them.
One of the core inserts 17a, ..., 17d. Therefore, a step is formed between the protruding core inserts 17a and 17c and the adjacent core inserts 17b and 17d and the movable side mold plate 14, and the gas vents 18 of the protruding core inserts 17a and 17c. Since the side surfaces that had been formed are exposed, it is possible to clean these side surfaces as they are. Further, since the step is formed as described above, the core inserts 17a, ..., 17d can be removed from the fitting hole 16 of the movable side mold plate 14. At this time, first remove the protruding core inserts 17a and 17c, and then insert the other core inserts 1a and 17c.
7b and 17d can also be removed. In this way, core inserts 17a, ..., 17d
By removing this, the entire core inserts 17a, ..., 17d can be cleanly cleaned and the inside of the fitting hole 16 can be cleaned.

After the cleaning, the ejecting rod 41 is returned, but with this, the second ejecting plate 28 is pushed by the second return spring 36, and the second ejecting plate 28 is moved.
Until it hits the step surface 31 of the core protruding pin 30, and the core protruding pin 30 also returns to a position where it does not interfere with the core inserts 17a and 17c at the predetermined position during molding. Then, using a suitable tool such as a hammer, the core inserts 17a, ..., 17d are fitted into the fitting holes of the movable side mold plate 14.
It fits in the inside of the fitting hole 16 and the core insert 17a, ...,
Drive 17d back into place and return.

As described above, according to the configuration of the above-described embodiment, the two-stage ejecting mechanism 26 is used to eject one of the adjacent core members 17a, ..., 17d forming the gas vent 18 therebetween. Therefore, the periphery of the gas vent 18 can be easily cleaned without disassembling the entire movable die 2, and the efficiency is improved. Further, since the core members 17a and 17c are projected by the second step protrusion which can be restrained by the stopper 33, the core members 17a and 17c are molded at the time of molding.
It is possible to surely prevent an extra operation of sticking out, and the precision of the molded product P is not impaired. Moreover,
In the two-stage ejecting mechanism 26, the first ejecting plate 27 pushes the second ejecting plate 28, and the second ejecting plate 28 is moved to the step surface 31.
Also, the structure for braking by the stopper 33 is simple.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example,
A plurality of mold members that form gas vents between each other, in terms of both number and shape, are core inserts as in the previous embodiment.
It is not limited to 17a, ..., 17d, but may be cylindrical ones arranged in the radial direction. Also, 2
The step protrusion mechanism is not limited to that of the above embodiment, of course. For example, even if two sets of protrusion plates are used, the protrusion rod on the fixed mold side is pushed by the protrusion rod, and another protrusion plate is interlocked with the protrusion plate by an interlocking pin. Good. Furthermore, in the above-mentioned embodiment, the injection molding of the thermoplastic resin has been described as an example, but the present invention can be applied to a molding die device of another molding material or another molding method.

[0028]

According to the invention of claim 1, in a molding die apparatus in which a gas vent is formed by a gap between a plurality of mold body members forming a cavity in a mold body provided with a protrusion mechanism, The mold body members are slidably movable relative to each other in the protrusion direction by the protrusion mechanism, and the protrusion mechanism is a two-stage protrusion mechanism that ejects the product by the first-stage protrusion and forms the gas vent by the second-stage protrusion. Since one of the adjacent adjacent mold body members is projected, the area around the gas vent can be easily cleaned.

Further, according to the second aspect of the invention, a two-stage ejecting mechanism is provided by the first ejecting plate, the second ejecting plate pushed by the first ejecting plate, and the stopper for locking the second ejecting plate. Since it is configured, the operation of the two-step protruding mechanism according to the invention of claim 1 can be realized with a simple structure without performing an unnecessary operation during molding.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a molding die device of the present invention when a mold is closed.

FIG. 2 is a cross-sectional view of the same mold when the mold is opened during molding.

FIG. 3 is a sectional view of the same when cleaning.

[Explanation of symbols]

 1 Fixed mold (mold body) 2 Movable mold (mold body) 3 Cavity 11 Movable side mounting plate (base body) 12 Movable side spacer block (base body) 13 Movable side receiving plate (base body) 14 Movable side mold plate (base body, mold body) 17a, 17b, 17c, 17d Core insert (mold body member) 18 Gas vent 26 Two-stage ejection mechanism 27 First ejection plate 28 Second ejection plate 29 Product ejection pin 30 Core ejection pin (mold member ejection pin) ) 33 Stopper P products

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B29C 45/40 7639-4F B29C 45/40

Claims (2)

[Claims] 1. A plurality of mold bodies which are opened and closed to form a product-shaped cavity between them when the molds are closed, and a ejecting mechanism which is provided on the mold bodies and ejects a molded product when the molds are opened to release the molds. The mold body provided with this ejecting mechanism has a plurality of mold body members forming a cavity, and a molding die in which a gas vent for communicating the cavity to the outside of the mold body is formed by a gap between the mold body members. In the apparatus, the plurality of mold body members are slidably movable with respect to each other in a projecting direction by a projecting mechanism, and the projecting mechanism is a two-step projecting mechanism that projects a product by the first projecting and the second projecting. A molding die device, characterized in that one of the adjacent mold body members forming a gas vent is projected by the above-mentioned projection. 2. The ejecting mechanism includes a first ejecting plate having a product ejecting pin for ejecting a product, and a second ejecting plate having a mold member ejecting pin for ejecting the mold member. The plate is independently movable in the same direction with respect to the base body of the mold body provided with the ejecting mechanism, and the first ejecting plate is located on the cavity side of the first ejecting plate. 2. The molding die device according to claim 1, wherein the plate is configured to be pushed, and the base is provided with a stopper for releasably locking the second protruding plate with respect to the base.