JPH01295807A - Mold opening sequence mechanism for resin forming mold - Google Patents

Abstract

PURPOSE:To make it possible to mold-open a cavity line from its rear side, by providing an air lock part in a sealed part prepared at the top of the slide hole for a sliding pin between a fixed template and a movable template, wherein said air lock part evacuates the inside of said slide hole when said sliding pin advances when closing the mold and at the same time locks said fixed and movable templates, the inside of said slide hole being in the state of negative pressure when starting the mold opening. CONSTITUTION:As a movable template 3 is closed against a fixed template 2, a guide pin 20 advances in a slide hole 21 to increase the air pressure in the slide hole and exhaust air from a gap of locked face portion 29. Since the gap between the fixed template 2 and the movable template 3 tends to open and the guide pin 20 tends to return from the slide hole 21, and the slide hole 21 sealed with the O-ring 36 of the guide pin 20 becomes to be in the state of negative pressure, the locked face portion 29 is wedged with a lock receiving face 27 and the air lock is operated. Therefore, a runner plate 1 and the fixed template 2 are firstly mold-opened. Further, as mold-opening force is applied to an air lock portion 23, the fixed template 2 and the movable template 3 are mold-opened, resisting the air lock force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism for later opening a cavity line in a resin molding mold for a three-plate tube.

[Prior Art] For example, a three-plate type machine equipped with a binocular gate includes a movable mold plate, a fixed mold plate, and a runner seat. When starting the mold opening of this type of three-plate type, the fixed mold plate and +ji movable mold plate are kept in a locked state, and the fixed mold plate and the runner plate are opened first. For example, as disclosed in "Easy Plastic Mold" (published by Sanko Publishing Co., Ltd., July 30, 1980, E5th edition, p. 71), fI (A catch is provided on the outside of the movable mold plate, and a mechanism is adopted in which the catch is inserted into the fixed mold plate, and the lock sleeve is inserted into the car and row 2 car.

When locking, the rocker enters the pawl inside the catch, the end of the low 7 cam pushes the wind force l of the catch and closes the pawl, and then the lock sleeve enters the pawl cam and locks the pawl. This is a mechanism that fixes the

When releasing the lock, the shoulder at the lower end of the release bottle serves as a mechanism to pull up the lock sleeve and separate it from the claw cam of the catch.

[Problem to be Solved by the Invention] Since the cam lock R-stage as described above is provided on the outside side of the fixed mold plate and the W (moving mold plate), it is difficult to take out the cam lock from the parting line on one side or the other side. When the robot is run to take out the molded product and the runner is to be dropped in the opposite direction, at least two or three sides of the mold must be used. Considering this, there were significant positional constraints for molds with small projection surface dimensions.

Furthermore, since a cam lock mechanism is used, each member must be added to each mold plate after the mold opening/closing stroke is determined, making installation and stroke adjustment work cumbersome. Moreover, the force l and the locking mechanism are complicated, and the number of items is large, resulting in high costs.

Therefore, the present invention was developed in order to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide the simplest mold opening sequence mechanism that can be attached to various molds using existing sliding bottles. Its purpose is to

L step part for solving problem C The present invention for solving problem J includes a movable mold plate, a fixed mold plate, and a separable plate, and when opening the mold, one of the mold plates and the plate can be separated. This relates to a resin molding die that is opened first.

The feature is that a sealing part is recessed into the tip of the sliding hole of the sliding pin between the fixed mold plate and the movable mold plate, and the sealing part is sealed. In the l'1 part, when the mold is closed, the sliding pin is 1) 1j and l? ] An air lock part is provided which evacuates the inside of the dynamic chamber and locks the fixed mold plate and the movable mold plate by creating a negative pressure inside the sliding hole at the time of starting mold opening.

[Operation] When the mold is closed, the air pressure inside the sliding hole increases as the sliding pin moves forward, so the air lock part is released and the air is discharged from inside the sliding hole to the outside.The sliding pin reaches its forward limit. It has penetrated deeply into the sliding hole, and in this state it is hardened.
The iE' mold plate and the movable mold plate are in the mold closed position.

At the start of mold opening after resin molding, a mold opening force of molecule 1i=T is applied to each mating surface of the plate, fixed mold plate, and movable mold plate. The birch line between the fixed mold plate and the movable mold plate tries to open, but when the sliding pin tries to retreat inside the sliding hole, an air lock part comes out. , the mating surface of either template with the other plate is first opened. By receiving the full mold opening force at this mold opening limit, the fixed mold plate and the +11 to 12 plate are opened against the air lock portion.

[Embodiment of the Invention] Figures 1 to 4 show an embodiment of the present invention, and illustrate a bottle point gate type injection mold.

In the figure, 1 is a runner plate as a plate for other molecules, 2 is a fixed template, 3 is a movable template,
4 is a fixed side mounting plate, 5 is a super block, 6 is a movable side mounting plate, 7 is an ejector plate, 8 is an ejector pinot, 9 is a support bin, and these are typical three plate type resin molding metals. A mold is formed. Also, 10 is a sprue, 11 is a runner part, 12 is a bin point gate,
13 is a cavity, 14 is a mating surface of the runner plate 1, 15 is a mating surface of the fixed template 2 on the runner plate side, 1
6 is a parting line of the fixed template 2, and such a configuration is known.

One feature of this embodiment is that a guide pin 20 is provided as a sliding pin between the fixed mold plate 2 and the pivoting mold plate 3, and a sealing part 22 is provided at the tip 21a of the sliding hole 21. The air lock portion 23 is provided in the sealed portion 22. The sliding hole 21 can be formed in the guide/f push 24, and a stepped part 25 provided at the tip thereof has four parts 2 as a sealing part.
It can be put to practical use with a sealed structure in which the two are fitted together.

The air lock 23 has a through hole 26 penetrating into the sliding hole, and a lock receiving surface 27 having a tapered conical shape is formed on the large sliding side of the through hole 26. It is constructed by urging the lock piece 28 toward the larger sliding side. The lock piece 28 consists of a lock surface portion 29 that protrudes in a tapered conical shape and comes into close contact with the lock receiving surface portion 27, an air receiving surface portion 30 at the tip of the lock surface portion, and a reduced diameter portion 31 in the latter half. A spring 32 is wound around it. The spring 32 can be prevented from popping out by caulking the outside of the through hole 26, but it is also possible to tighten the first retaining plate 33 with a screw 34 as shown in FIG.

In addition, the mating surface 1 of the guide bush 24 marked with m+ and the fixed mold plate 2
5 can be communicated with an air relief groove 35. Furthermore, an O-ring 36 can be wound around the guide bin 20.

The effect based on the above configuration will be explained.

TI relative to the fixed mold plate 2 (As the movable mold plate 3 is closed, the guide pin 20 moves forward through the sliding hole 21, increasing the air pressure inside the sliding hole.This air pressure 30, the lock piece 28 is moved backward against the spring 32, and air is discharged from the gap between the lock surface portion 29 and the lock receiving surface portion 27.

At the end of the air discharge, the mating surfaces 14 and 15 of the runner plate l and the fixed mold plate 2 become mold-closed shape f9, so
Air is discharged from the air relief groove 35. The guide pin 20 penetrates deeply into the sliding hole at its forward limit,
As shown in FIGS. 1 and 2, the fixed mold plate 2 and the movable mold plate 3 are at the mold closing (ft).

At the start of mold opening after resin molding, mold opening force is applied to each mating surface of the runner plate 1, fixed mold plate 2, and ifl movable mold plate 3. The space between the fixed template 2 and the movable template 3 is about to open, but
Along with this, the guide pin 20 tends to retreat from the sliding hole 21. Guide pin 20 against the trigger of backward movement.
Since the collapse hole 21 which is knolled by the O-ring 36 is in a negative pressure state, the locking surface portion 29
The air lock is activated by the wedge engagement. Therefore, the mating surfaces 14 and 15 of the runner plate l and the fixed mold plate 2, which have a perfect mating adhesion force, are first opened as shown in FIG. 3, and the runner R is projected.

In the above case and when the eye is opened, the entire mold opening force is applied to the air lock portion 23 because the support bin 9 prevents further opening of the mold. As a result, fixed template 2 and I
The I-clinging mold plate 3 is opened against the air fluff of the air lock portion 23. In this case, since the sliding gap between the guide pin 20 and the sliding hole 21 is about 20 to 30 microns, the air lock is naturally released by suction of air from the sliding gap. The molded product is projected from the cavity 13 when the mold is opened.

1-l-According to the embodiment, the body 2 attached to the guide bushing 24
2 can be fitted together to form a sealed portion, so there is an advantage that it can be easily put into practical use by adding it to a conventional guide bin structure as is.

As shown in FIG. 5, if the guide bushing 24 is provided with a valve 40 as an air lock, the lock will come into close contact with the large side, and when the lock is released, the valve 40 will open in the direction shown by the imaginary line and air will be discharged. It will be done. As the valve 40, a check valve that swings in the direction of the opening force can be used, and can be provided in a housing groove 41 formed in the guide bushing 24 with a check valve housing structure. Note that 42 is a caulking or screw I tightening portion for attaching the valve 40.

Further, as shown in FIG. 6, the guide pin 50
The guide bushing 5 is arranged from the movable mold plate 3
1 is arranged correspondingly. [- The guide bushing 51 is formed with an integral sealing portion 52, and the airlock portion 23 may be provided in the sealing portion 52.
It is. In this case, it is desirable to form the air escape groove 53 in a large size along the spacer block 5, and it can be used simply by attaching the guide bushing 37 having the above structure. Furthermore, although the 11th plate of the spring 32 of the air lock portion 23 is shown at 174, it can be omitted since the movable mold plate 3 and the spacer block 5 are not separated.

The Ll6 embodiments may be implemented in combination with each other. Furthermore, although the movable pin 20.50 is shown as an example, it is not intended to be limited thereto, and other sliding pins that slide between the fixed mold plate 2 and the movable mold plate 3 can also be used. In a mold that has a receiving plate that can be separated from the mold plate 3, an air lock part using a sliding pin is provided as described in (h).
The first step is to design the moving mold plate 3 and the receiving plate separately.

[Effects of ffi brightness] As explained above, the following effects can be achieved according to the tree light 1.

``) A sealed part is provided at the tip of the sliding chamber of the sliding pin provided between the fixed mold plate and the movable mold plate, and in the sealed part, when the mold is closed, the sliding pin advances and exhausts the mold. By providing an air lock section that locks the fixed mold plate and the movable mold sand by creating a negative pressure inside the PM flow hole at the start of opening, one of the mold plates and the other plate can be opened first, and parting can be performed later. I was able to semi-open the line.

(2) A simple mold opening sequence structure using sliding pins can be put to practical use, and the assembly structure can be provided to an existing structure or as a Chinese-German structure.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the mold opening sequence mechanism in a resin molding mold according to the present invention, and Figure 1 is a cross-sectional view of the mold closed state taken from the support pin, cavity, and guide pin portions. The overall view, Figure 2 is an enlarged sectional view of the main part of the air lock, and Figure 3 is! ! FIG. 4 is an enlarged sectional view of the main part in the air discharge state, and FIGS. 5 and 6 are enlarged sectional views IA of the main part showing other examples. ■・・・Plate, 2...Fixed template, 3...
Eq moving template, 5...-spacer block. 9...Support pin, 11...Runner part, 1
2...Pinpoint gate, 13...Cavity, 20.50...Sliding pin. 21...Sliding hole, 22.52...Sealing part, 23
．． 40...Air lock part, 24.51...Guide bushing. 28... Lock piece, 35... Air up to L
l+W. Patent applicant: Shinko Selvic Co., Ltd. Agent: Attorney General tl 口j Yoshiharu 0
/ Figure 4 Figure 5

Claims (2)

[Claims] (1) Resin molding that is equipped with a movable template, a fixed template, and a plate that is separated from these templates, and in which the cavity line is opened after one of the templates and the plate are first opened. In the mold, a sealing part is provided at the tip of the sliding hole of the sliding pin between the fixed mold plate and the movable mold plate. 1. A mold opening sequence mechanism for a resin molding mold, characterized in that an air lock portion is provided for locking a fixed mold plate and a movable mold plate by creating a negative pressure state in a sliding hole at the time of opening. (2) The mold opening sequence mechanism in a resin molding mold according to claim 1, wherein the sliding pin is a guide pin.