JP3079863B2 - How to remove the mold runner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary mold plate and a movable mold plate. The fixed mold plate is divided into a runner-arranged side and a fixed mold plate body and a runner plate. After molding the molded product, the mold runner is removed from the side of the mold by using a three-plate type mold having a mechanism capable of separating the mold runner from the molded product portion when the mold is opened. The present invention relates to a method and an injection mold used for the method. In particular,
As shown in FIG. 1, a method for taking out a molding runner portion suitable for a case where the molding runner portion R is large and vertically long in the mold opening direction (the ratio of length a / width b is large) and injection molding used therefor Regarding the mold.

[0002]

2. Description of the Related Art In the above-mentioned three-plate type mold, a molded product part and a molding runner part (a sprue part / runner part) can be separated when the mold is opened, and the trouble of cutting the gate is unnecessary.
It is heavily used.

[0003]

However, in the above-mentioned three-plate type mold, it is necessary to form a connection position so that the gate is parallel to the product opening direction with respect to the product cavity. In order to take out the molding runner part (sprue part / runner part),
It is necessary to make a large opening between the fixed mold plate and the runner plate, and as a result, it is necessary to increase the mold opening of the whole mold. This is undesirable because it means a class upgrade of the molding machine.

For this reason, in Japanese Patent Application Laid-Open No. 49-7367, a sprue portion / runner portion, which is a molding runner portion, is broken to shorten the entire length of the molding runner portion in the mold opening direction. Techniques for reducing the amount of mold opening have been proposed.

However, in the case of this technique, the shaving runner portion is broken, so that cutting chips tend to be generated. Further, since the shaping runner portion is divided into several parts, the removal of the shaping runner portion becomes troublesome.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a molding runner that does not require breaking of the molding runner without breaking the molding runner, thereby reducing the space for removing the molding runner. An object of the present invention is to provide a removal method and an injection mold used for the method.

[0007]

Extraction method of forming Katachiyu path unit and an injection mold for use therewith of the present invention, in order to solve the problem] is to be solved by the following constitution of the above-mentioned problems.

[0008] extraction method forming Katachiyu path unit according to claim 1 is composed of a fixed mold plate and the movable side mold plate, the fixed-side mold plate body and runner runner disposed side of the fixed-side mold plate is divided consists of a plate, after forming the injection-molded article, using a three-plate type mold having a mechanism for the molding runner section can fixed die plate body or we release the opening of the mold, the molding runner When the mold is opened from the side of the mold, the molding runner
Is rotated about an axis perpendicular to the side of the mold in the removal direction.
And remove it from between the fixed-side template body and the runner plate.
It is characterized in that the molding runner is taken out of the mold after it has been made into a possible flat shape .

The injection molding die according to claim 2 is a die used in the method for removing a molding runner portion according to claim 1, wherein the molding is carried out in a fixed-side mold plate main body or a runner plate. A molding that has a slide core capable of forming a space rotatable about an axis perpendicular to a side surface of a mold in a direction in which the runner is taken out, and has a function of rotating the forming runner. A runner removal machine is provided between the stationary mold plate and the runner plate so as to be able to enter and exit.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments.

(1) A mold used in this embodiment will be described (see FIGS. 2 to 6).

Basically, similarly to the conventional example, the fixed-side template 2 and the movable-side template 4 are provided, and the fixed-side template 2 on the side where the runner 6 is provided is divided into the fixed-side template 2 and the runner 6. Board 1
0, after the injection molded product is formed, a mechanism is provided that enables the mold runner (sprue / runner / gate) R to be released from the fixed-side mold plate body 8 when the mold is opened.

Specifically, a mechanism for separating the molding runner portion R from the fixed-side mold plate body 8 is formed on the fixed-side mounting plate 12.
The operation is performed by a runner lock pin 14 which protrudes into the runner 6 through a through hole 10a formed in the runner plate 10 and has an undercut hook at the tip. The movable mold plate 4 is mounted on a movable mounting plate 18 via a spacer 16. The protruding mechanism of the molded product part relatively moves in a space formed between the movable side mold plate 4 and the movable side mounting plate 18 and reciprocates with a protruding rod 20 attached to the molding machine. 22
And is supported by a protruding pin 24 held by the arm.

The present embodiment having the above structure, the slide core 26 to form available-rotatable space plane perpendicular to the opening direction mold molding runner portion on the fixed side mold plate body 8 is formed In addition, a molding runner removing machine having a function of rotating the molding runner R is provided between the fixed mold plate 2 and the runner plate 10 so as to be able to enter and exit.

More specifically, the slide core 26 is located at the front dead center position when the mold is closed and at the rear dead center position when the mold opening is completed by the angular pins 27 held on the movable mold plate 4. I have.

As a molding runner removing machine, for example, as shown in FIG. 6, a pair of air-driven sandwiching plates are attached to the tip of a removing shaft 28 which can be moved forward / backward and rotatable by an air cylinder (not shown). The one provided with the unit 30 is used.

Here, the slide core 26 is provided in the fixed-side mold plate main body 8, but may be provided in the runner plate 10. In addition, other general-purpose driving means such as a hydraulic cylinder, a coil spring, and a cam can be used for driving the slide core 26 without using the angular pins 27.

(2) Next, a description will be given of a method of removing the molding runner using the above-described mold apparatus.

The product cavity 3 of the mold in the closed state
2, runner (sprue 34 / runner 6 / gate 36)
, A molten molding material (generally, a thermoplastic resin material) is ejected from an ejection nozzle of an injection molding machine to fill the material.
(See FIG. 2) After the molding material in the product cavity 32 has solidified, the mold opening is started. First, the runner plate 10
Opening of the mold between the fixed-side mold body 8 and the fixed-side mold body 8 starts. At this time, the runner R is formed by the runner
-It remains on the plate 10 side, is separated from the molded product part M, and is released from the fixed-side mold plate main body 8.

Next, mold opening starts between the fixed-side mold body 8 and the movable-side mold plate 4, and when the mold opening is completed, the protruding plate 22 relatively advances, and the molded product portion M moves. Side template 4
And the release of the molded product part M is completed.

At the same time, the runner plate 10 and the fixed side mounting plate 1
2, the molding runner R is fixed to the fixed side mounting plate 1.
The second runner lock pin 14 also comes off. (See FIG. 4) At this time, the slide core 26 is guided by the angular pin 27 and is at the rear dead center position, one direction surface of the molding runner R is opened, and the molding runner R is moved in the mold opening direction. A rotatable space is formed on a plane orthogonal to the plane. At this time, the sandwiching plate portion 30 of the forming runner take-out machine T is advanced between the fixed mold plate 2 and the runner plate 10, and the rotation center of the forming runner portion R (the gate portion in the example in the figure). 38 is gripped.

Then, the molding runner R is rotated by 90 ° in a flat direction by a molding runner removing machine T, and in this state, the sandwiching plate portion 30 is further retracted to outside the mold. When it is positioned, the grip is released and the molding runner R is dropped and taken out. Here, the rotation angle is set to 90 °. However, if the rotation angle becomes relatively flat, the rotation angle can be arbitrarily set to 45 ° or more.

(3) In addition to the above, a take-out machine T1 as shown in FIGS.

A first air cylinder 42 fixed to one side of the runner plate 10 for moving forward and backward, and a first air cylinder 42
And a second air cylinder 48 for rotating the first air cylinder 48 by a rack 44 / pinion 46 mechanism. An end of an actuator 50 which is a piston rod of the first air cylinder 48 has an undercut hook portion 52 which projects into the runner 6 when the mold is closed. . The hook portion 52 may be provided with a bubble mechanism capable of ejecting compressed air to blow off the molding runner portion R.

The use of the molding runner removal machine T1 is basically the same as that of the molding runner removal machine T except that the actuator 50 is projected into the mold runner 6 when the mold is closed. It is.

[0026]

The operation and effects of the present invention are as follows, since the method for removing a molding runner and the injection mold used therefor have the above-mentioned structure.

Since the molding runner is rotated and taken out of the mold, the space for removing the molding runner can be reduced.
There is no need to increase the amount of mold opening between the fixed-side mold plate main body and the runner plate, and thus the entire mold.
Therefore, the amount of mold opening (daylight amount) of the molding machine can be reduced, and the molding machine can be relatively small.

Also, unlike the technique disclosed in Japanese Patent Application Laid-Open No. 49-7367, the molded runner is not broken, so that no cutting waste is produced and the molded runner is not divided into several parts. It is easy to take out.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molding runner portion suitable for application with the present invention.

FIG. 2 is a cross-sectional plan view of a molding die used in the method of removing a molding runner according to the present invention when the mold is closed.

FIG. 3 is a side sectional view of FIG. 2;

FIG. 4 is a side cross-sectional view of a molding runner take-out machine when the forming die used in the method for removing a molding runner according to the present invention is opened.

FIG. 5 is a side cross-sectional view after the molding runner is rotated.

FIG. 6 is a perspective view showing an example of a molding runner removing machine used in a method of removing a molding runner used in the method of the present invention.

FIG. 7 is a side sectional view showing a part of a mold to which another molding runner removing machine is attached.

FIG. 8 is a view of the molding runner removing machine of FIG. 7 taken along line VIII-VIII.

[Explanation of symbols]

 2 Fixed mold plate 4 Movable mold plate 8 Fixed mold plate main body 10 Runner plate 14 Runner lock pin 26 Slide core M Molded product part R Mold runner T, T1 Mold runner removal machine

Claims (2)

(57) [Claims] 1. A fixed-side mold plate and a movable-side mold plate, and a runner disposition side of the fixed-side mold plate is divided into a fixed-side mold plate body and a runner plate. When removing the molding runner from the side of the mold using a three-plate type mold having a mechanism that enables the molding runner to be released from the fixed-side mold plate body when the mold is opened. When the mold is opened, the molding runner portion is moved in the direction of removal.
Rotate with the axis perpendicular to the mold side, and
After having a flat shape that can be taken out from between the inner plate
A method for removing a molding runner, comprising removing the molding runner from the mold. 2. A mold used in the method for removing a molded runner according to claim 1, wherein the molded runner is disposed in the fixed-side mold plate body or the runner plate in a direction in which the molded runner is removed. A molded core runner take-out machine having a function of rotatable the molded runner portion, wherein a slide core capable of forming a rotatable space with an axis perpendicular to the mold side surface is formed by the fixed side mold plate. And a runner plate. The mold for injection molding is provided so as to be able to enter and exit.