JPH06126785A - Ejecting device of resin forming mold - Google Patents

Abstract

PURPOSE:To realize the sure ejecting of resin formed article out of a retainer plate under the condition that the strength of the retainer plate is sully ensured. CONSTITUTION:By forward moving ejector pins 23, which are arranged on an ejector plate 22, a resin formed article is ejected out of one retainer plate 11 in the ejecting device of the resin forming mold concerned. In addition, an ejector hook 25 having a projected part 25a is provided to the ejector plate 22 and, at the same time, a projecting 12b is formed on one side of the other retainer plate 12 so as to hold the projected part 25a of the ejector hook 25 and the projection 12b under the state being engaged with each other when the retainer plate 11 and the other retainer plate are opened each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for ejecting a molded product from a resin molding die used in injection molding or the like, and more specifically, it is arranged on the ejector plate by the operation of the ejector plate. The present invention relates to the improvement of an ejecting device for a resin molding die in which an ejector pin is moved forward with respect to one of the mold plates and a resin molded product is projected from the one mold plate.

[0002]

2. Description of the Related Art Conventionally, in a resin molding die for injection molding or the like, as shown in FIG. 9, the ejector plate 3 is operated while the mold plates 1 and 2 are expanded.
By moving the ejector pins 4 and 4 arranged on the ejector plate 3 respectively toward the movable side mold plate 2, the movable side mold plate 2 and the resin molded product 5 are moved through these ejector pins 4 and 4. Is designed to project.

The ejector plate 3 is normally movably arranged at a portion located between the movable side mold plate 2 and the mounting plate 6 holding the movable side mold plate 2, and is not shown in the drawing. When the ejector rod 7 of the molding machine advances and moves through the mounting plate 6, it comes into contact with the ejector rod 7 and advances and moves with respect to the movable mold plate 2.

[0004]

By the way, in a normal resin molding die, a plurality of support pins 8 are disposed between the movable side mold plate 2 and its mounting plate 6.

Since these support pins 8 and 8 ensure the strength of the movable side mold plate 2, they are arranged at positions corresponding to the distribution of the pressure applied to the movable side mold plate 2 during molding, for example. Is preferred.

However, as described above, in the resin molding die, the moving range of the ejector rod 7 must be secured between the movable side mold plate 2 and the mounting plate 6 thereof, in other words, As shown in FIG. 10, when the support pin 8 ′ is arranged in the moving area of the ejector rod 7, it becomes impossible to operate the ejector plate 3 to cause the resin molded product 5 to project. There were significant restrictions on the position of the pin 8.

In view of the above situation, an object of the present invention is to provide a resin molding die ejecting device capable of reliably ejecting a resin molded product from the mold plate while sufficiently securing the strength of the mold plate. To provide.

[0008]

In an ejector for a resin molding die according to the present invention, an ejector pin disposed on the ejector plate is moved forward with respect to one of the mold plates by the operation of the ejector plate, In an ejecting device of a resin molding die in which a resin molded product is projected from the one mold plate, the ejector plate is operated between the ejector plate and the one mold plate or the other mold plate. It constitutes an operating means.

[0009]

According to the above construction, the ejector plate is operated by the operating means arranged between the ejector plate and the one mold plate or the other mold plate.

[0010]

The present invention will be described in detail below with reference to the drawings showing the embodiments. 1 to 7 conceptually show a resin molding die 10 to which an ejecting device according to the present invention is applied. As shown in FIG. 3, one mold plate 11 on which a core 11a is formed and , The other mold plate 12 in which the cavity 12a is formed is closed with each other.
a and the product cavity 13 defined between the core 11a
Injection mold 1 for molding an injection molded product, for example, a bumper W for a four-wheeled vehicle, by injecting a molten resin into
0 is illustrated.

As shown in FIG. 1, one template 11 has a protrusion 11b on one side surface thereof, and is attached to a mounting plate 15 through a plurality of support pins 14, and this mounting plate 15 is further mounted. It is attached to the movable side die plate 16 of the injection molding machine (not shown) through. Protrusion 11
b is integrally molded with the one template 11 and the template 1
1 extends outward from the side surface of the No. 1 and has a through hole 11c at the base end thereof, and an adjust pin 17 at the end of the surface facing the mounting plate 15. The through hole 11c is formed along the opening / closing direction of the template 11 or 12 (indicated by the arrow X in the drawing, and hereinafter simply referred to as the mold opening / closing direction), and is opened at both end surfaces of the protrusion 11b. There is. The amount of protrusion of the adjustment pin 17 from the protrusion 11b is appropriately changed by operating the adjustment nut 17a, and is extended along the mold opening / closing direction X.

The support pins 14 have a columnar shape having the same height, and are located at appropriate positions according to the distribution of the pressure applied to the one template 11 during molding, for example, the one template 11. Of the mold plate 11 corresponding to the four corners and the ejector rod 18 of the injection molding machine (not shown).

The other template 12 has a protrusion (actuating means) 12b on one side surface thereof, and a pressing body 19 at a portion covering the protrusion 12b. The protrusion 12b and the pressing body 19 are arranged. The other side is the template 11 on one side.
It is attached to a fixed-side die plate of an injection molding machine (not shown) via a mounting plate 20 in a manner corresponding to one side surface provided with the protruding portion 11b. Protrusion 12
As shown in FIG. 8, b is a surface 12b on the side of the mounting plate 20.
1 has a triangular prism shape that is inclined more than the surface 12b2 on the side of one of the mold plates 11, and is integrally formed with the other mold plate 12. The pressing body 19 is, as shown in FIG.
The leaf spring is formed by appropriately deforming the leaf spring, and the bolt 21 is attached to one side surface of the other die plate 12 through the base end portion.
Attached to the mounting plate 20 with respect to the protrusion 12b, and extends outward from a portion located on the mounting plate 20 side, and then bends from there to the portion corresponding to the arrangement portion of the protrusion 12b. The template 12 is extended in such a manner as to gradually approach one side surface of the template 12, and is bent from the side surface of the template 12 so that the other template 12 is bent.
And has a shape extending in a manner to be gradually separated from one side surface. As is clear from the figure, this pressing body 19
The tip portion is arranged at a position projecting from the contact surface 12c of the other mold plate 12 with the one mold plate 11.

Further, the injection molding die 10 is provided with an ejector plate 22 at a portion located between the one die plate 11 and the mounting plate 15. The ejector plate 22 has the insertion holes 22 at positions corresponding to each other.
It is configured by joining a pair of plate constituent elements in which a is formed. By inserting the support pin 14 at the central portion into these insertion holes 22a, the support holes 14 are arranged so as to be movable in the mold opening / closing direction X. Ejector pins 23 are provided at appropriate locations in the area corresponding to the defined area of the product cavity 13, and the product cavity 1
A return pin 24 is provided at an appropriate position outside the area defined by No. 3, and an ejector hook (actuating means) is provided on a side surface corresponding to one side surface on which the protrusion 11b of one template 11 is provided.
25 are provided.

Ejector pin 23 and return pin 2
4 are respectively extended along the mold opening / closing direction X,
The respective tip portions are fitted in the sliding holes formed in the one template 11 in such a manner that they are projected and retracted from the contact surface 11d of the one template 11 with the other template 12 and the surface of the core 11a. Has been inserted.

As shown in FIG. 3, the ejector hook 25 has a structure in which the mold plates 11 and 12 are closed from each other, and when the ejector plate 22 is farthest from the one mold plate 11, the ejector plate 22 is separated from the other mold plate 11. A working portion 25b having a length longer than the distance to the protrusion 12b formed on the template 12 and having a protruding portion 25a formed on one side surface of the tip portion thereof, and a base end portion of the acting portion 25b. A bearing portion 25c and an abutting portion 25d extending in directions away from each other
Has a substantially T-shape, and the tip portion of the acting portion 25b is a penetrating portion formed on the one template 11 with the projecting portion 25a of the acting portion 25b facing inward. Insertion hole 11c
The support portion 25c in such a manner that the acting portion 25b is swung in the direction of approaching and separating from the one template 11.
It is supported by the ejector plate 22 through. As shown in FIG. 8, the projecting portion 25a of the ejector hook 25 has a triangular prism shape in which the surface 25a1 on the base end side is inclined more than the surface 25a2 on the tip end side, and It is configured to be higher than the protrusion 12b formed on the template 12. Contact part 2 of ejector hook 25
As shown in FIG. 1, 5d has a length corresponding to the projecting portion 11b provided on the one template 11, and is located on the extension area of the adjusting pin 17 arranged on the projecting portion 11b. It is located in.

Reference numeral 26 in FIG. 1 is interposed between the ejector plate 22 and the mounting plate 15 of the one mold plate 11, and the ejector plate 22 and the mounting plate 15 are provided.
It is a stopper pin that secures a predetermined gap between and.

In the injection mold 10 constructed as described above, when the movable die plate 16 of the injection molding machine (not shown) is operated from the expanded state shown in FIG. 1, the mounting plate 15 and the support pin 15 One template 11 is moved via 14 in a direction approaching the other template 12, and
Along with the movement of the support pins 14 and one of the mold plates 11, the ejector plate 22 is moved in a direction of approaching the other mold plate 12.

When the operation of the movable die plate 16 proceeds, first, as shown in FIG.
The leading end of the acting portion 25b of the ejector hook 25 is guided between the pressing body 19 and one side surface of the other mold plate 12 while expanding the pressing body 19, and thereafter the protruding portion 25 of the ejector hook 25 is formed.
a and the projection 12b of the other template 12 have a gentle slope 25 with respect to each other.
It is in a state of abutting engagement through a2 and 12b2. When the movable die plate 16 is further actuated from this state, the action portion 25b of the ejector hook 25 resists the pressing force of the pressing body 19 by the action of the gentle slopes 25a2 and 12b2 contacting each other, as shown in FIG. After being swung in the direction of arrow A, as shown in FIG. 8, the projection 25a of the ejector hook 25 rides over the projection 12b of the other template 12. In addition, the protruding portion 2 of the ejector hook 25
After 5a has passed over the protrusion 12b of the other template 12, the elastic restoring force of the pressing body 19 causes the acting portion 25b of the ejector hook 25 to swing in the opposite direction to the above, and the protruding portion 25a. Is held in contact with the other template 12.

When the operation of the movable die plate 16 is further continued, the tip surface of the return pin 24 is then in contact with the one mold plate 11 of the other mold plate 12c.
And the other template 1 via the return pin 24.
The proximity movement of the ejector plate 22 with respect to 2 is prevented.

When the movable die plate 16 operates with the movement of the ejector plate 22 being blocked, only one of the mold plates 11 is moved in the direction in which the mold plate 11 approaches the other mold plate 12, and eventually, as shown in FIG. As shown in FIG. 1, one mold plate 11 is completely closed with respect to the other mold plate 12, and injection of the molten resin into the product cavity 13 is started via a sprue and a gate (not shown). It At this time, the stopper pin 26 of the ejector plate 22 is in contact with the mounting plate 15, and the ejector plate 2
2 is arranged at the most distant position from one mold plate 11, and the tip surfaces of the ejector pin 23 and the return pin 24 are respectively on the surface of the core 11a and the other mold plate 12 of the one mold plate 11. Abutment surface 11 with
It is occupying a position that matches d.

When the molten resin injected into the product cavity 13 is solidified by appropriately maintaining the pressure and cooling, the movable die plate 16 is operated in the opposite direction to the above,
As shown in FIG. 4, the mounting plate 15 and the support pin 14
One template 11 is attached to the core 11a via the bumper W.
Is moved in a direction in which it is separated from the other mold plate 12 in a state of holding, and the ejector plate 22 is moved relative to the other mold plate 12 with the movement of the support pins 14 and the one mold plate 11. Are moved away from each other.

As the operation of the movable die plate 16 progresses, first, the projecting portion 25a of the ejector hook 25 and the projection 12b of the other mold plate 12 are steeply inclined to each other 25a1.
The ejector hook 2 is abutted and engaged via 12b1.
The separation movement of the ejector plate 22 with respect to the other template 12 is prevented through the step 5. That is, the gentle slopes 25a2 and 12b2 at the time of mold closing as described above abut each other, and the action portion 25b of the ejector hook 25.
Unlike the state in which the
When the mold is opened, the steep slopes 25a1 and 12b1 are in contact with each other, and the action portion 25b of the ejector hook 25 is pressed by the pressing body 19, so that the projecting portion 25a of the ejector hook 25 is formed on the other mold plate 12. The protrusion 12b cannot be passed over, and the protrusions 25a and the protrusion 12b are held in a state of abuttingly engaging each other, and the movement of the ejector plate 22 with respect to the other template 12 is prevented.

When the movable die plate 16 is operated in a state where the movement of the ejector plate 22 is blocked, only one mold plate 11 is moved in the direction away from the other mold plate 12 this time. The ejector plate 22 is moved relatively close to the mold plate 11 on one side, and as shown in FIG.
The core 11a is moved by advancing from the surface of 1a.
The bumpers W held by are sequentially ejected.

When the movable die plate 16 continues to operate from the above state, as shown in FIG.
The adjusting pin 17 arranged on one of the template 11 is brought into contact with the contact portion 25d of the ejector hook 25, and the acting portion 25b of the ejector hook 25 resists the pressing force of the pressing body 19 and is shown in FIG. By swinging in the direction of arrow A, the abutting engagement state between the protrusion 25a and the protrusion 12b is released.

Therefore, when the movable die plate 16 is operated from this state, the ejector plate 22 is moved together with the one mold plate 11 again in the direction away from the other mold plate 12, as shown in FIG. The bumper W
Is completely projected from the core 11a, the template 11,
12 will be fully expanded from each other.

The amount of protrusion of the bumper W from the core 11a can be changed by appropriately adjusting the adjustment pin 17. Further, during the above-described injection molding, the ejector rod 18 of the injection molding machine (not shown) is set so as to be constantly kept in a retracted state when the mold plates 11 and 12 are attached to the die plate 16, respectively. .

The injection molding of the bumper W is continued by sequentially repeating the above-described operation.

In the above embodiment, the ejecting device for the injection mold applied when the bumper for a four-wheeled vehicle is injection-molded is illustrated, but the present invention is not limited thereto. Further, the mold plate is opened and closed by moving one mold plate, but the present invention can be similarly applied to a mold in which the other mold plate is moved to open and close the mold plate. Further, in the embodiment, the support pin is provided at the portion corresponding to the ejector rod of the injection molding machine, but the support pin does not necessarily have to be provided at the portion corresponding to the ejector rod.

Further, in the above embodiment, when the mold plates are opened with each other, the projecting portions of the ejector hooks arranged on the ejector plate and the projections formed on the other mold plate are held in a state of being engaged with each other. However, the activating means for activating the ejector plate by utilizing the opening / closing movement of the template is illustrated, but the present invention is not limited thereto. For example, if an actuating means using an actuator is adopted, it is possible to construct the actuating means between one of the mold plates.
When an ejector hook similar to that of the embodiment is used, it is of course possible to dispose this hook on the other mold plate side and form a projection on the ejector plate. Further, in the embodiment, only one actuating means is provided, but a plurality of actuating means may be provided if necessary.

[0031]

As described above, according to the ejecting apparatus for the resin molding die according to the present invention, the operating means disposed between the ejector plate and one of the mold plates or the other mold plate. Since the ejector plate is actuated by the above, it is possible to dispose the support pin at a required position to sufficiently secure the strength of the template and to surely project the resin molded product from the template.

[Brief description of drawings]

FIG. 1 is a sectional view conceptually showing a resin molding die to which an ejecting device according to the present invention is applied.

FIG. 2 is a sectional view conceptually showing a resin molding die to which the ejecting device according to the present invention is applied.

FIG. 3 is a sectional view conceptually showing a resin molding die to which the ejecting device according to the present invention is applied.

FIG. 4 is a sectional view conceptually showing a resin molding die to which the ejecting device according to the present invention is applied.

FIG. 5 is a sectional view conceptually showing a resin molding die to which the ejecting device according to the present invention is applied.

FIG. 6 is a sectional view conceptually showing a resin molding die to which the ejecting apparatus according to the present invention is applied.

FIG. 7 is a sectional view conceptually showing a resin-molding die to which the ejecting device according to the present invention is applied.

FIG. 8 is an enlarged view of a portion VIII in FIG.

FIG. 9 is a cross-sectional view conceptually showing a resin molding die to which a conventional ejecting device is applied.

FIG. 10 is a sectional view conceptually showing a resin molding die to which a conventional ejecting device is applied.

[Explanation of symbols]

 11 ... One mold plate 12 ... The other mold plate 12b, 25 ... Actuating means 22 ... Ejector plate 23 ... Ejector pin W ... Resin molded product

Claims (1)

[Claims] 1. A resin molding for ejecting a resin molded product from one of the mold plates by advancing and moving an ejector pin arranged on the ejector plate with respect to one of the mold plates by the operation of the ejector plate. In the ejecting device of the mold, the ejector plate and the one mold plate,
Alternatively, an ejecting device for a resin molding die, comprising an actuating means for actuating the ejector plate between the other die plate and the other die plate.