JPH0479285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a mold opening device that reliably opens a mold such as an injection mold in a predetermined order.

"Prior Art" FIG. 12 shows a three-plate mold as an injection mold. This three-plate mold has three plates: a runner stripper plate 1 forming a fixed side mold, a fixed side mold plate 2, and a movable side mold plate forming a movable side mold 3. . According to this three-plate mold, injection molding can be performed using a pinpoint gate.

By the way, in the case of such a three-plate mold, the first dividing surface 4 between the runner stripper plate 1 and the fixed side mold plate 2 and the movable side mold 3,
It is necessary to open the second dividing surface 5 between the stationary templates 2 in a predetermined order. That is, in general, in this type of three-plate mold, first, the first dividing surface 4 is opened, the runner is taken out with it attached to the runner stripper plate 1, and then the second
The dividing surface 5 must be opened and the molded product attached to the movable mold 3 must be taken out.

Normally, this kind of three-plate mold is suitable for
Utilizing the state in which the fixed side mold plate 2 is strongly attached to the movable side mold 3 via the molded product or the slide mechanism, the fixed side mold plate 2 is integrated with the movable side mold 3 when the mold is opened. First, the first dividing surface 4 between the runner stripper plate 1 and the stationary template 2 is opened. Thereafter, the fixed mold plate 2 is stopped at a predetermined position using a connecting rod or the like, and the second dividing surface 5 between the movable mold 3 and the fixed mold plate 2 is opened.

However, the bite (adhesive force) of the molded product to the fixed mold plate 2 or the movable mold plate 3 is weak, and if there is no sliding mechanism, the engagement between the movable mold plate 3 and the fixed mold plate 2 is weak. Therefore, if you just pull the fixed side mold plate 2 with the movable side mold 3
Therefore, the first dividing surface 4 between the runner stripper plate 1 and the stationary template 2 cannot be opened.

When such a problem is expected, in the conventional three-plate mold, a coil spring or the like is installed between the runner stripper plate 1 and the fixed side template plate 2, and the elastic force of this coil spring is used to Fixed side template 2
Conventionally, the movable mold 3 side is biased to compensate for the above-mentioned locking force and open the first dividing surface 4.

However, in the case of a three-plate mold equipped with coil springs, it is difficult to predict the elastic force necessary and sufficient to compensate for the above-mentioned locking force at the time of mold manufacturing, so it is difficult to predict the elastic force necessary and sufficient to compensate for the above-mentioned locking force. There was an inconvenience that it took time and effort to manufacture the mold. Further, with such a mold, there was a problem that as production continued, the elastic force of the coil spring gradually decreased, making it impossible to open the mold correctly.

"Means for solving the problem" Next, we will discuss the first method for solving the above problem.
Description will be given along with the embodiment shown in the figure.

The mold opening device of the present invention includes an actuating member 11 that is movable in a direction crossing the mold opening direction and has a hook portion formed on one side in the displacement direction, and an actuating member 11 that is engaged with the hook portion of the actuating member. An engaged member 12 having a locking portion that slides into contact with the side opposite to the side on which the hook portion of the actuating member is formed to prevent displacement of the hook portion when the mold is closed. It is characterized by comprising a locking member 13 that fixes the engaged state between the hook part and the locking part and releases the engaged state by allowing displacement of the hook part when the mold is opened. be.

"Example" Hereinafter, the mold opening device of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the mold opening device of the present invention, which is attached to a three-plate injection mold. Each member of the mold opening device of the present invention is attached to a different plate.
In this example, the actuating member 11 is the movable mold 3
The engaged member 12 is fixed to the stationary template 2, and the locking member 13 is fixed to the runner stripper plate 1.

The actuating member 11 is made of an elastic plate, and includes a fixed part 11a fixed to the plate, and two actuating pieces 11b, 11b provided on both sides of the fixed part 11a so as to extend in the length direction of the actuating member 11. It consists of. This actuating piece 11b can be displaced by deforming in a direction intersecting the mold opening direction A (in this example, coincident with the length direction of the actuating member 11). A hook portion 11c is formed at the tip of the outer side of the operating piece 11b in the operating direction. The hook portion 11c has a triangular shape with a rounded top and is formed to face the outside of the actuating member 11. The inner surface of the distal end portion of the operating piece 11b opposite to the side where the hook portion 11c is formed is a sliding surface 11d. The two actuating pieces 11b, 11b are spaced apart from each other so that they can be elastically deformed, and a slotted portion 11e is formed between the actuating pieces 11b, 11b. This slotted part 1
1e is widened on the proximal end side of the actuating piece 11b, and the distal end is formed into a smooth circular shape. The length of this actuating member 11 is set to reach the engaged members 12, 12 fixed to the adjacent stationary mold plate 2 when the second dividing surface 5 of the mold is closed. .

The engaged member 12 is provided with a locking portion 12a into which the hook portion 11c of the actuating member 11 is fitted. This locking portion 12a is connected to the engaged member 1.
One side of the locking portion 12a is bulged, and the corners of this locking portion 12a are chamfered. The top of the hook portion 11c of the actuating member 11 is locked to this locking portion 12a. In the mold opening device of this example, two engaged members 12, 12
are fixed at the center of the stationary mold plate 2 at symmetrical positions across the mold opening direction A. The locking portions 12a, 12a are opposed to each other at a position on the movable mold 3 side.

The locking member 13 consists of a fixed part 13a fixed to the plate and a sliding part 13b extending from the fixed part 13a. This sliding contact part 13
b is the sliding contact surface 11d, 11d of the operating member 11;
The actuating piece 11 fits into the slotted part 11e between the
b, 11b, and prevents the displacement of the actuating member 1.
The width is approximately equal to the width between the sliding contact surfaces 11d and 11d of Nos. 1 and 11. The tip of this sliding contact portion 13b is smoothly rounded. This lock member 1
3 is formed to such a length that the sliding contact portion 13b is in sliding contact with the sliding surfaces 11d, 11d of the actuating member 11 until the first dividing surface 4 of the mold is opened a predetermined distance. ing.

"Operation" Next, the operation of the mold opening device of the present invention will be explained with reference to FIGS. 1 to 4.

First, when the mold is closed, as shown in FIG. Hook portion 11 of fixed actuating member 11
c and 11c are locked. In addition, the operating member 11
The sliding portion 1 of the locking member 13 fixed to the runner stripper plate 1 is provided in the slotted portion 11e.
3b is fitted without loosening.

Next, in order to open the mold, the movable plate of the injection molding machine is moved back, and the movable mold 3 is moved back.

Then, in the initial stage, the sliding portion 13 of the locking member 13 is in contact with the slotted portion 11e of the actuating member 11.
b is fitted, the actuating piece 11b of the actuating member 11 cannot be displaced, and the hook portions 11c, 11c of the actuating member 11 cannot be removed from the locking portions 12a, 12a of the engaged members 12, 12. Therefore, the fixed side mold plate 2 moves integrally with the movable side mold 3 and retreats, and as shown in FIG. will be released first. The distance over which the first dividing surface 4 is opened is between the sliding contact surface 11d of the actuating member 11 and the locking member 1.
The distance is longer than the sliding distance of the sliding contact portion 13b of No. 3.

When the movable mold 3 and the fixed mold plate 2 are further moved back, the sliding portion 13b of the locking member 13 is removed from the slotted portion 11e of the actuating member 11. Then, since the actuating piece 11b of the actuating member 11 becomes deformable, the actuating member 11 is displaced and its hook portions 11c are separated from the locking portion 12a of the engaged member 12, as shown in FIG. It comes off. Therefore, the fixed mold plate 2 and the movable mold 3 are separated, and as shown in FIG.
The dividing surface 5 is opened.

In this way, in the mold of this example, when the mold is opened, the dividing surfaces 4 and 5 are opened in the order of the first dividing surface 4 and the second dividing surface 5.

"Other Embodiments" FIGS. 5 to 7 show a second embodiment of the mold opening device of the present invention, and the same components as those in the first embodiment are given the same reference numerals and explained. Simplify.

The engaged member 12 of the mold opening device in this example has a cylindrical shape. The peripheral surface of this engaged member 12 is a locking portion 12a.

Further, the actuating member 11 is U-shaped, and the portions extending on both sides thereof serve as actuating pieces 11b, 11b. In this operating member 11, the operating piece 1
Arc-shaped notches are formed inside 1b and 11b, and these portions serve as hook portions 11c and 11c. The outer surface of this actuating member 11 is a sliding surface 11d.

The locking members 13, which come into sliding contact with the sliding surfaces 11d and 11d of the actuating member 11, are thin plate-like members, and two locking members 13 are provided so as to sandwich the actuating member 11 therebetween.

5 to 7 show each member 11, 12, 13 of this mold opening device being attached to a different plate.

First, in the mold shown in FIG. 5, the operating member 11 is attached to the movable mold 3, the engaged member 12 is attached to the stationary mold plate 2, and the locking member 13 is attached to the runner stripper plate 1. It is being

Further, in the case of the mold shown in FIG. 6, the operating member 11 is attached to the stationary mold plate 2, the engaged member 12 is attached to the movable mold 3, and the locking member 13 is attached to the runner stripper plate 1. It is being

The molds shown in FIGS. 5 and 6 first have a runner stripper plate 1 and a fixed side mold plate 2.
The first dividing surface 4 between them is opened, and then the second dividing surface 5 between the fixed mold plate 2 and the movable mold 3 is opened.

On the other hand, FIG. 7 shows an example in which this mold opening device is used for a mold in which it is necessary to open the special second dividing surface 5 first, and the actuating member 11 is attached to the stationary mold plate 2. The engaged member 12 is attached to the runner stripper plate 1, and the locking members 13, 13 are attached to the movable mold 3.

8 and 9 show a third embodiment of the mold opening device of the present invention, and the same components as in the first embodiment are given the same reference numerals to simplify the explanation thereof. .

The actuating member 11 of the mold opening device in this example consists of one actuating piece 11b that does not undergo elastic deformation. Sliding surface 11d at the tip of this actuating piece 11b
The side is cut out diagonally, and the guide part 11f
It is said that Fixed part 11 at the end of the actuating member 11
A is rotatably attached to the movable mold 3 via a pin 14, thereby making the actuating member 11 movable in a direction intersecting the mold intervening direction A. A stopper pin 15 is provided on the movable mold 3 to regulate the rotation angle of the rotating actuating member 11.

In this mold opening device, the rotation of the actuating member 11 is prevented by the locking member 13, so that the hook portion 11c of the actuating member 11 and the locking portion 12a of the engaged member 12 are engaged with each other. is maintained. When the movable mold 3 is moved back, the fixed mold plate 2 moves together with the movable mold 3, and the first dividing surface 4 is first opened. Then, when the movable mold 2 is further retreated and the lock member 13 is disengaged from the actuating member 11, the actuating member 11 is rotated and displaced.
The hook portion 11c is removed from the engaged member 12. With this, the movable side mold 3 and the fixed side mold plate 2
are separated and the second dividing surface 5 is opened.

When closing this mold, the tip of the lock member 13 comes into contact with the guide portion 11f of the actuating member 11 and returns the actuating member 11 to its original position, so that the hook portion 11c of the actuating member 11 is engaged It is locked to member 12.

FIG. 10 shows a mold attached to a fourth embodiment of the mold opening device of the present invention, and the same components as those in the first embodiment are given the same reference numerals to simplify the explanation.

The locking member 13 of the mold opening device in this example consists of a thin plate-shaped fixing part 13a and a disk-shaped sliding contact part 13b provided at the tip thereof. Also,
Since the actuating member 11 consists of two actuating pieces 11b, 11b, the width of the slotted portion 11e between the actuating pieces 11b, 11b is widened on the base end side of the actuating piece 11b. The sliding surfaces 11d, 11d of the actuating member 11 are formed on the inner surface of the proximal end portion of the actuating pieces 11d, 11d facing the widened portion of the slotted portion 11e. The sliding contact portion 13b of the locking member 13 is connected to the operating member 1.
It is provided in the widened portion of the slotted portion 11e of No. 1 so as to be movable while slidingly contacting the sliding surfaces 11d, 11d.

In the mold shown in FIG. 10, the actuating member 11 is attached to the stationary mold plate 2, the engaged member 12 is attached to the runner stripper plate 1, and the locking member 13 is attached to the movable mold plate 3. attached.

In the mold opening device of this example, the lock member 1
When the sliding contact portion 13b of No. 3 is on the tip side of the actuating member 11, the actuating piece 11b of the actuating member 11 is difficult to deform and cannot be displaced.
c, 11c and the engaged members 12, 12 are not unlocked. Then, the sliding contact portion 1 of the lock member 13
3b moves toward the proximal end of the actuating member 11, the actuating piece 11b is easily displaced, and the hook members 11c, 11c of the actuating member 11 and the engaged members 12, 12
It becomes possible to release the lock.

When the movable mold 3 of this mold is moved back, the movable mold 3 is first separated from the fixed mold plate 2, and the second dividing surface 5 between the movable mold 3 and the fixed mold plate 2 is opened. be done. At this time, even if the movable mold 3 and the fixed mold plate 2 are strongly engaged, the sliding contact portion 1 of the locking member 13
3b is located on the distal end side of the actuating member 11, so that the hook portions 11c, 11c of the actuating member 11 and the engaged member 1
2 and 12 are not released, and the stationary mold plate 2 is not moved back together with the movable mold 3.

Then, as the movable mold 3 retreats, the sliding portion 13b of the lock member 13 retreats within the slotted portion 11e of the actuating member 11, and the actuating pieces 11b, 11b of the actuating member 11 gradually become easier to deform. When the sliding portion 13b of the locking member 13 abuts against the base end of the slotted portion 11e, the actuating piece 1 of the actuating member 11 is pulled by the locking member 13.
1b, 11b are displaced inward, and the hook portions 11c,
11c is removed from the engaged members 12, 12. Then, the stationary template 2 to which the operating member 11 is attached begins to move backward as it is pulled by the roller member 13.
The dividing surface 4 is opened.

FIG. 11 shows a mold to which a fifth embodiment of the mold opening device of the present invention is attached, and the same components as in the fourth embodiment are given the same reference numerals to simplify the explanation.

The mold opening device of this example consists of an operating member 11, an engaged member 12, and a locking member 13.

The actuating member 11 has two actuating pieces 11b, 11b.
The slotted portion 11e between the actuating pieces 11b is widened on the base end side of the actuating piece 11b. The sliding surfaces 11d, 11d of the actuating member 11 are formed on the inner surface of the proximal end portion of the actuating pieces 11d, 11d facing the widened portion of the slotted portion 11e.

The lock member 13 has a fixed part 13a and a sliding part 13.
It consists of b. The sliding portion 13b of the locking member 13 is connected to the slotted portion 11 of the actuating member 11.
Sliding surfaces 11d, 11 are attached to the widened portion of e.
d, and in this example, it is formed into a disk shape. The fixing portion 13a of the locking member 13 is in the shape of a long plate. The sliding contact portion 1 is provided on the distal end side of the fixed portion 13a.
3b, and a long hole 13c extending in the length direction is provided on the proximal end side. This locking member 13 is secured to a fixed portion 11a of the actuating member 11 by a pair of bolts 16, 16 inserted through a long hole 13c.
is fixed. The position of the sliding portion 13b of the locking member 13 in the slotted portion 11e of the operating member 11 can be determined by loosening the bolts 16, 16 and moving the locking member 13 back and forth along the elongated hole 13c. It can be adjusted.

In the mold opening device of this example, the lock member 1
When the sliding contact portion 13b of No. 3 is located on the proximal end side of the actuating member 11, the actuating piece 11b of the actuating member 11 is easily deformed. On the other hand, when the sliding contact portion 13b of the locking member 13 is on the distal end side of the actuating member 11, the actuating piece 11
b becomes difficult to deform. In this way, the lock member 13
By moving the sliding contact portion 13b, the hook portions 11c, 11c of the actuating member 11 and the engaged member 1
2 and 12 can be adjusted.

In the mold shown in FIG. 11, the engaged member 12 is attached to the stationary mold plate 2, and the actuating member 11 and the locking member 13 are attached to the movable mold 3. When the movable mold 3 is moved back when opening the mold, the movable mold 3 and the fixed mold plate 2 are strongly engaged by the mold opening device, so that the fixed mold plate 2 The first dividing surface 4 is first opened by moving together with the movable mold 3. Then, the movable mold 2 is further moved back, and the actuating member 11
Since a strong force is applied to deform the actuating pieces 11b, 11b, the actuating member 11 is deformed and displaced, and its hook portion 11c is detached from the engaged member 12.
As a result, the movable mold 3 and the fixed mold plate 2 are separated, and the second dividing surface 5 is opened.

In the mold opening device of this example, the lock member 1
By changing the position of the sliding contact portion 13b of No. 3,
The force with which the actuating member 11 and the engaged member 12 engage can be adjusted. Therefore, it is possible to appropriately adjust the force of engagement between the movable mold 3 and the fixed mold plate 2 to a value that does not impose stress on the mold or the molding device.

"Effects of the Invention" As explained above, the mold opening device of the present invention has the following features:
An actuating member that is displaceable in a direction crossing the mold opening direction and has a hook portion formed on one side in the displacement direction, and an engaged member that has a locking portion that engages with the hook portion of the actuating member. When the part and the mold are closed,
The actuating member slides into contact with the side opposite to the side on which the hook is formed to prevent displacement of the hook and fix the state of engagement between the hook and the locking part, and and a lock member that releases the engaged state by allowing displacement of the hook part when opened, and the hook part of the actuating member and the engaged state remain until the lock member releases the locking state of the actuating member. The state of engagement with the member is not released.

Therefore, in a mold equipped with this mold opening device, the dividing surface formed by the plate provided with the locking member is always opened first, and then the plate provided with the operating member and the engaged member are provided. The dividing plane formed by the plate is now open.

In this way, according to this mold opening device, the molds can be opened reliably in a predetermined order, eliminating molding troubles associated with mold opening, eliminating time loss due to molding troubles, and improving production efficiency. It is possible to improve performance and reduce production costs.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a first embodiment of the mold opening device of the present invention, FIGS. 2 to 4 are plan views for explaining the operation of the same embodiment, and FIG.
FIG. 6 and FIG. 7 are plan views showing different attachment states of the same mold opening device to the mold, and FIG. 8 shows a third embodiment of the mold opening device. A plan view, FIG. 9 is a plan view for explaining the operation of the third embodiment, FIG. 10 is a plan view showing the fourth embodiment of the mold opening device, and FIG. 11 is a plan view of the fifth embodiment of the mold opening device. FIG. 12 is a plan view showing an example of a three-plate mold for injection molding. 4...First dividing surface, 5...Second dividing surface, 11...
...Operating member, 11c...Hook portion, 12...Engaged member, 12a...Locking portion, 13...Lock member, A...Mold opening direction.

Claims (1)

[Scope of Claims] 1. A mold opening device that regulates the opening order of dividing surfaces of a mold having a plurality of dividing surfaces, wherein a hook portion that can be displaced in a direction intersecting a mold opening direction is arranged on one side of the displacement direction. an actuating member formed on a side portion of the actuating member; an engaged member having a locking portion that engages with a hook portion of the actuating member; and an engaged member having a locking portion that engages with a hook portion of the actuating member; The engagement state between the hook part and the locking part is fixed by slidingly contacting the opposite side part to prevent displacement of the hook part, and when the mold is opened, the displacement of the hook part is allowed and the above-mentioned locking part is fixed. A mold opening device comprising a locking member that releases an engaged state.