JP3094268B2 - 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 a three-plate type injection molding apparatus capable of separating and recovering a runner and a molded product (product).

[0002]

2. Description of the Related Art Conventionally, there is a three-plate type injection molding apparatus capable of separating and recovering a molded product (product) and a runner. The three-plate mold device is a mold device including a fixed mold and a movable mold, wherein the fixed mold is composed of a fixed mounting plate, a runner stripper plate, and a fixed mold plate. The parting line surface between the movable mold and the fixed mold plate, and the gap between the fixed mold plate and the runner stripper plate can be freely separated by a predetermined stroke to separate the molded product and the runner. In general, the runner stripper plate is configured such that the runner can be removed when the mold is opened by moving the runner stripper plate toward and away from the fixed mounting plate by a predetermined stroke.

A predetermined stroke of the parting line surface between the movable mold and the fixed mold plate is limited by a link, and a predetermined stroke between the fixed mold plate and the runner stripper plate is a puller bolt. The predetermined stroke between the runner stripper plate and the fixed side mounting plate is determined by the predetermined stroke of the parting line surface between the movable mold and the fixed side mold plate from the entire mold opening amount and fixed. A predetermined stroke between the side template and the runner stripper plate is drawn. The adoption of the puller bolt, except for a special structure, by providing a spring on the puller bolt,
At the time of opening the mold, the gap between the fixed side mold plate and the runner stripper plate is first opened so that the gate between the molded product and the runner is cut first.

[0004] A general three-plate type mold apparatus performs a molding operation in the following steps. The molten resin is injected from the nozzle of the molding machine into the mold device in the mold clamped state,
It is filled into the cavity through the runner and cooled. After the cooling is completed, the mold opening starts and the movable mold comes off, and the spring between the puller bolt opens the gap between the fixed mold plate and the runner stripper plate first, and the runner locks the runner. Since it is attracted to the fixed side by the pin, it is cut at the weakest gate. When the mold opening further proceeds, the parting line surface is opened and a molded product can be taken out. here,
Except for some special structures, the molded product is left on the molding surface of the movable mold. The opening between the fixed-side mold plate where the runner falls and the runner stripper plate and the parting line surface where the molded product falls becomes full of the stroke limit, and the movable mold is fixed-side mold. When the mold is opened apart from the runner, the runner stripper plate is pulled by the link and the puller bolt, forcibly separating the joint between the runner lock pin and the runner, and the runner falls. On the other hand, the ejector plate holding the ejector pins is operated by using the operation of the ejector rod of the molding machine, and the molded article is protruded by the ejector pins and falls. After confirming that the molded product and the runner have fallen, mold clamping starts and returns to the beginning.

[0005]

In the prior art, when the mold is opened, the parting line surface has a predetermined stroke by a link between the fixed mold plate and the movable mold plate, and the fixed mold plate is a runner. The stripper plate is configured to be opened by a predetermined stroke with a puller bolt. However, when the mold is clamped, the amount of each opening is limited by an amount that is limited. There is no problem because the puller bolt is fixed to the runner stripper plate by the stop bolt, but the link that is not fixed and is in a free state slides freely with its set stroke and You will change the position. That is, the link may protrude out of the outer shape of the mold apparatus (see the state shown at 18 'in FIG. 1),
When the mold device is transported with the link protruding out of the outer shape of the mold device, it may be caught on the surroundings, especially when the mold is changed by the automatic mold changer, It becomes an obstacle when using the auto clamp of the mold,
It is necessary to push the link into the outer shape of the mold apparatus and hold it down by hand so as not to protrude, which has a problem that it is troublesome and dangerous.

Accordingly, an object of the present invention is to make it possible to easily replace a mold by making it possible to fix the link in a fixed position so that the link does not protrude outside the outer shape of the mold apparatus. Is to do.

[0007]

In order to achieve the above object, the present invention comprises a movable mold and a fixed mold comprising a fixed mounting plate, a runner stripper plate and a fixed mold plate. When the mold is opened, at least the gap between the movable mold and the fixed mold plate and the gap between the fixed mold plate and the runner stripper plate are opened, so that the molded product and the runner can be separated and collected. In the injection molding die device, a link is provided between the movable die and the fixed die plate at an outer peripheral portion of the die device to limit a mold opening amount between the movable die and the fixed die plate. A temporary fixing means for fixing the link to a position where the link does not protrude from the mold apparatus in a mold-clamped state is provided on the outer peripheral portion.

[0008] The temporary fixing means may be a magnet for the iron link, or may be an elastic member for the link having the locking recess.

[0009]

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. FIG. 1 is a cross-sectional view showing an injection mold apparatus according to the present invention in a mold-clamped state, and FIG. 2 is in a mold-open state. The fixed mold P and the movable mold Q are connected to four guide pins 8 fixed to the movable mold plate 7 of the movable mold P during clamping (only one guide pin 8 is shown in FIGS. 1 and 2). (Shown) are guided through four guide bearings 9 (only one is shown in FIGS. 1 and 2) provided on the fixed mold plate 3 on the fixed mold Q side.

First, the fixed mold P will be described. A runner stripper plate 2 is provided on the left side of the fixed side mounting plate 1, and a fixed side mold plate 3 is provided on the left side of the runner stripper plate 2. A sprue bush 10 on which a sprue 10a is formed is mounted on the fixed-side mounting plate 1 via a locate ring 11. The sprue bush 10 is fitted with a nozzle (not shown) of a molding machine. Further, four support pins 12 are fixed to the fixed side mounting plate 1 (only one is shown in FIGS. 1 and 2), and are provided on each of the runner stripper plate 2 and the fixed side mold plate 3. The runner stripper plate 2 and the fixed-side mold plate 3 are slidable with respect to the fixed-side mounting plate 1 by being inserted through the four support pin bushes 13 and 14 (only one is shown in FIGS. 1 and 2). In a state of being pivotally supported by The fixed-side mounting plate 1 has a tip 15a formed in an undercut shape, and a runner lock pin 15 that passes through the runner stripper plate 2 and reaches the runner portion 3a of the fixed-side mold plate 3 is mounted.

Several puller bolts 16 (only one puller bolt is shown in FIGS. 1 and 2) are provided between the runner stripper plate 2 and the fixed side mold plate 3, and the puller bolts 16 and the puller bolts 16 are provided. Stop bolt 17 fixed to runner stripper plate 2
(Only one is shown in FIGS. 1 and 2).
The opening stroke of the mold and the runner stripper plate 2 is limited. The puller bolt 16 is provided between the runner stripper plate 2 and the fixed side template 3.
A compression coil spring (not shown) is inserted as a biasing means around the shaft. When the mold device is opened from the mold-clamped state, the compression coil springs are used for the two plates 2 and 3.
The gap is biased so as to preferentially start opening first.

The fixed mold plate 3 of the fixed mold P and the movable mold plate 7 of the movable mold P described later are connected by a link 18. When the mold 18 is opened from the mold-clamped state, the space between the runner stripper plate 2 and the fixed-side mold plate 3 is fully opened to the extent limited by the puller bolt 16, and the link 18 is fixed to the fixed-side mold plate 3. When the space between the movable mold plate 7 and the movable mold plate 7 is completely opened to the extent limited by the link 18, the movement of the movable mold Q (in the direction away from the fixed mold P) is transmitted to the fixed mold P, and the runner The stripper plate 2 is moved last.

Next, the movable mold Q will be described. The movable mold Q is attached to a movable member (not shown) of the molding machine, and can move forward and backward with respect to the fixed mold P.
A spacer block 5 is fixed to the right side of the movable side mounting plate 4, and a movable side receiving plate 6 is fixed to the right side of the spacer block 5.
The movable mold plate 7 is fixed in that order.

The molded product W remaining on the molding surface of the movable die Q of the parting line surface R in the space provided by the spacer block 5 between the movable mounting plate 4 and the movable receiving plate 6. A projecting mechanism for projecting is provided. The ejecting mechanism includes an ejector plate 19, ejector pins 20a and 20b fixed to the ejector plate 19, and a return pin (not shown). The ejecting mechanism is arranged such that the ejector pins 20a and 20b can enter through the through holes 7a and 21a formed from the movable-side receiving plate 6 to the core 21 and the movable-side mold plate 7 so that the molded product W can be ejected. . A return spring (not shown) is provided on the return pin, and urges the ejector plate 19 in a retreating direction.

A through hole 4a is formed substantially at the center of the movable side mounting plate 4.
Is provided, and an ejector rod (not shown) of the molding machine can move forward and backward.

Here, in the present invention, the gripping means for fixing the link 18 in a fixed position at the time of mold clamping is the link 1
8 are located where they are attached. In one embodiment, the magnet 22 is fitted to the fixed side template 7 with respect to the iron link 18, and the link 18 is fixed to a fixed position of the fixed side template 7 by the magnet 22. .

Next, the operation of this embodiment will be described.
First, mold clamping is performed. The movable mold Q fixed to the movable member of the molding machine approaches the fixed mold P, and a parting line surface R between the fixed mold plate 3 and the movable mold plate 7 is formed.
Is closed to form a molding surface (the state of FIG. 1).

The molding material in which the pellets fed from the hopper of the molding machine advance and are heated and melted by the screw in the cylinder passes through the sprue 10a of the sprue bush 10, the runner portion 3a, and the gate portion 3b to form a cavity. It is injected into the part 3c. After the injection of the molding material, the molding material in the cavity 3c is cooled and solidified.

Next, mold opening is started. The movable mold Q starts to separate from the fixed mold P. Where the mold device opens
Parting line surface R (fixed mold plate 3 and movable mold plate 7
), Between the fixed mold plate 3 and the runner stripper plate 2, and between the runner stripper plate 2 and the fixed mounting plate 1 (see FIG. 2). Instead, they are opened in the order described below.

The first opening starts between the fixed mold plate 3 and the runner stripper plate 2. this is,
A compression coil spring (not shown) is compressed and inserted in a clamped state around a puller bolt 16 disposed between the fixed mold plate 3 and the runner stripper plate 2 in a mold clamped state. , 2 in the opening direction. When the space between the fixed mold plate 3 and the runner stripper plate 2 is opened, the runner 22 of the runner portion 3a is cut by the weakest gate portion 3b because it is held by the runner lock pin 15 (see FIG. 2).

When the mold is further opened, the parting line surface R is opened. This is because the runner 23 of the runner portion 3a formed on the fixed side mold plate 3 has the runner lock pin 15 formed in an undercut shape.
a, the runner stripper plate 2 is held on the fixed side mounting plate 1 side.
Is not urged in either the closing direction or the opening direction. At this time, the molded product W needs to remain on the movable mold Q, not on the fixed mold P.

The opening between the runner dropping portion (between the fixed mold plate 3 and the runner stripper plate 2) and the molded product dropping portion (parting line surface R) becomes full, and both the link 18 and the puller bolt 16 become full. Is finally hooked at both ends, the space between the runner stripper plate 2 and the fixed-side mold plate 3 is finally opened. Then, when the runner stripper plate 2 is opened, the connecting portions of the runner lock pin 15 and the runner 23 are forcibly released. At this time, the runner 23 is repelled by the separated runner and is dropped from the runner fall portion.

After the mold opening is completed, the ejector plate 19 projects using the operation of the ejector rod of the molding machine, so that the ejector pins 20a, 20b project, and the molded product W remaining in the cavity 3c is ejected. The protruded molded product W falls from the molded product falling section and is collected. When the ejector rod of the molding machine is retracted, the ejector plate 20 is retracted, and the ejector pins 20a and 20b are retracted. Then, mold clamping is performed again, and the same process is repeated to form a target production number.

When the forming operation is repeated, the magnet 22 fitted to the fixed side mold plate 7 to fix the iron link 18 fixes the link 18 in a fixed position. Therefore, even when the link 18 changes from the mold open state (FIG. 1) to the mold clamped state (FIG. 2), it does not protrude out of the outer shape of the mold apparatus.

In this embodiment shown in FIGS. 1 and 2, a magnet 22 as a gripping means for fixing the iron link 18 in a fixed position is fitted into the fixed side mold plate 3. The position is, specifically, a position where the link 18 is shifted to the link mounting pin 24 of the fixed side template 3. However, the magnet 22 does not have to be fitted to the fixed mold plate 3 and the link 22 does not have to protrude outside the outer shape of the mold device when the mold device is in the mold clamped state. The purpose is achieved even if the fixed-side mounting plate 1 is fitted. When the magnet 22 is fitted on the fixed-side mounting plate 1, the fixed position of the link 18 is where the link 18 is fixed to the magnet 22.

According to this embodiment, in the mold clamping state, the link 18 is fixed at a fixed position without protruding outside the outer shape of the mold apparatus.

[0027]

[Other Embodiments] As another embodiment, as a gripping means for fixing the link 18 in the mold clamping state when the molding operation is repeated, the material forming the link 18 is not limited.
The link 1 is provided with a locking recess 18a, and the link 1
An example in which the locking recesses 18a of FIG. FIG. 3 shows an example in which the ball plunger 25 is applied as an elastic member. When the locking concave portion 18a provided on the link 18 comes to the ball-contacting ball portion 25a of the ball plunger 25 when the mold is changed from the mold opening state (FIG. 2) to the mold clamping state (FIG. 1), the ball plunger 25 Contact ball part 25a
Can lock the link 18 in a fixed position by locking the locking recess 18a of the link 18.

Also in this embodiment, the ball plunger 25
The ball plunger 25 does not have to be fitted into the fixed side mold plate 3 and the link 18 does not protrude out of the outer shape of the mold device when the mold device is in the mold clamped state. The purpose can be achieved even if it is fitted in the side mounting plate 1.

[0029]

According to the structure of the present invention, since the link is fixed in a fixed position in a mold-clamped state so as not to protrude out of the outer shape of the mold apparatus, the surrounding parts are transported when the mold apparatus is transported. It does not become a hindrance when the tool is caught in the mold, when changing the mold with the automatic changer, or when using the automatic clamp of the mold.Therefore, be careful not to push the link into the outside of the mold device and push it out. There is no need to hold it down, and there is no trouble or danger.

The gripping means of the link is a magnet for the iron link and an elastic member for the link having the locking portion. By pulling, the link can be easily removed from the fixed position. Therefore, there is no problem in the molding operation without providing a special mechanism for opening the link.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an injection mold apparatus according to the present invention, in a mold-clamped state.

FIG. 2 is a cross-sectional view showing the injection molding die apparatus of the present invention, in a mold open state.

FIG. 3 is a partially enlarged sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed side mounting plate 2 Runner stripper plate 3 Fixed side mold plate 18 Link 18a Locking concave part 22 Temporary fixing means (magnet, elastic member) 23 Runner 25 Elastic member P Fixed side mold Q Movable side mold W Molded product

Claims (3)

(57) [Claims] 1. A movable mold, and a fixed mold composed of a fixed mounting plate, a runner stripper plate, and a fixed mold plate. When the mold is opened, at least the movable mold and the fixed mold are opened. An injection molding apparatus in which a molded product and a runner can be separated and collected by opening between a fixed mold plate and between the fixed mold plate and the runner stripper plate. A link is provided between the movable mold and the fixed mold plate at an outer peripheral portion of the mold device between the fixed mold plate and the fixed mold plate. In the injection molding die apparatus, there is provided a temporary fixing means for fixing the link at a position where the link does not protrude from the die apparatus in a clamped state. 2. The injection molding die apparatus according to claim 1, wherein the temporary fixing means is a magnet for an iron link. 3. The injection molding die apparatus according to claim 1, wherein the temporary fixing means is an elastic member with respect to a link having a locking recess.