JPH01165418A - Mold for molding - Google Patents

Abstract

PURPOSE:To simplify a mechanism and a control and to improve the molding efficiency, by setting a nozzle touch part with which an injection nozzle of an injection apparatus is brought into contact on a side face of a fixed mold and communicating this nozzle touch part and a runner groove part set on a parting face through a sprue hole part. CONSTITUTION:A mold is closed and when an injection is carried out under the condition that an injection nozzle 11 is brought into contact with a nozzle touch part 5, a molding material (a molten resin) is filled from an injection apparatus 18 through a path of an injection nozzle 11, a nozzle touch part 5, a sprue hole part 7, a runner groove part 6, a gate part 6 and a cavity 15. When this injection process is completed, through a defined dwell process, the mold is opened after cooling and solidifying, a molded item is adhered on a movable mold 3 and released from a fixed mold 2. After mold opening is completed, the molded item can be released from a movable mold 3 by actuating a projecting device 20 and forwarding projecting pins 21 and 22. The mold is closed again and the next molding cycle is carried out in the same way. In this case, as the injection nozzle 11 brought into contact with the nozzle touch part 5 remains as it is and the injection apparatus 18 are not required to be moved forward and backward, a control part for driving thereby becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention particularly relates to a molding die used for parting injection in which injection is performed in a direction perpendicular to the direction of opening and closing of the mold.

[Conventional technology]

In molding using an injection molding machine, the length of the runner part (runner branch) of the molding die can be further shortened to save molding material, increase the molding cycle by shortening the mold opening distance, and save space for installing the injection molding machine. So-called parting injection is known, which aims to reduce the

Conventional parting injection involves arranging the mold clamping device and injection device in an injection molding machine in an L shape, and injecting from a direction perpendicular to the mold opening/closing direction. It was composed. The molding die 50 shown in the figure is a fixed mold 5.
1 and a movable mold 52, both parting surfaces 51p
Runner grooves 51r and 52r are carved in the runner grooves 51r and 52p, and a nozzle touch portion 56 is provided in which the injection nozzle 55 contacts both the fixed mold 51 and the movable mold 52 and communicates with the runner grooves 51r and 52r.

Further, during molding, the injection nozzle 55 is sandwiched between the fixed mold 51 and the movable mold 52 and comes into contact with the nozzle touch part 56, so from the viewpoint of preventing damage to the injection nozzle 55 and the molding die 50, at least the mold During clamping, the injection nozzle 55 was moved backward, and when mold clamping was completely completed, the injection nozzle 55 was sheared so as to come into contact with the nozzle touch part 56.

[Problems that the invention attempts to solve]

However, in such a conventional molding die 50, the injection nozzle 5
In addition to causing a delay in the molding cycle due to the advancing and retreating time of the injection nozzle 55, there is a problem in that the molding material adheres to the injection nozzle 55 and tends to cause a so-called stringing phenomenon, especially in the type of injection from an injection device placed above. There were problems such as resin being caught between the parting surfaces, resulting in deformation of the mold, occurrence of flashing, and interruption of molding.

[Means for solving problems]

The present invention aims to provide a molding die that solves the problems existing in the conventional technology described above, and is achieved by a molding die 1 shown below.

That is, the molding die 1 according to the present invention consists of a fixed mold 2 and a movable mold 3, and the molding material W is applied from a direction perpendicular to the mold opening/closing direction.
Applied to parting injection molds where filling is performed,
In particular, the injection nozzle 11 of the injection device is mounted on the side surface 2a of the fixed mold 2.
The present invention is characterized in that a nozzle touch portion 5 is provided in contact with the nozzle touch portion 5, and this nozzle touch portion 5 is communicated with a runner groove portion 6 provided on the parting surfaces 2p and 3p through a sprue hole portion 7.

[For production]

Next, the operation of the molding die 1 according to the present invention will be explained.

The molding material W injected from the injection nozzle 11 is injected into the mold l.
From the nozzle touch part 5 provided on the fixed mold 2 to the sprue hole part 7
is sent to the runner groove 6 via the runner groove 6.

Therefore, opening and closing of the mold does not affect the nozzle touch part 5, and the injection nozzle 11 can repeat the molding cycle while remaining in constant contact with the nozzle touch part 5.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

First, the configuration of a molding die 1 according to the present invention will be explained with reference to FIG. 1. FIG. 1 is a longitudinal sectional view of the same molding die.

The mold l consists of a fixed mold 2 and a movable mold 3. The fixed mold 2 is attached to the mold mounting surface 12a of the fixed fixed platen 12,
Furthermore, the movable mold 3 is attached to the mold mounting surface 13a of the movable platen 13. The movable platen 3 is moved horizontally forward and backward by a mold clamping device (not shown) to open and close the movable mold 3 relative to the fixed mold 2.

On the other hand, a cavity 15 is provided on the parting surfaces 2p and 3p of each mold 2 and 3, and a gate portion 16 and a runner groove portion 6 communicating with the cavity 15 are gradually provided. Note that the point to be noted here is that the runner groove portion 6 should not be opened to the outside.

Furthermore, the runner groove 6 is located on the side surface 2a of the fixed mold 2.
According to the present invention, a nozzle touch portion 5 is provided near the nozzle.

The nozzle touch part 5 has a hemispherical shape into which the tip of the injection nozzle 11 fits. Furthermore, a sprue hole 7 is provided inside the fixed mold 2 to allow the nozzle touch portion 5 and the first runner groove portion 6 to communicate with each other. The sprue hole 7 is diagonal to the mold opening/closing direction! It is formed in a tapered shape in which the inner diameter gradually increases as it goes toward the slope 1-1 and the runner groove portion 6 side. The reason why the sprue hole portion 7 is formed in this manner is to enable the molded product Wo to be easily removed from the fixed mold 2 when the mold is opened. Therefore, the angle of inclination of the sprue hole 7 with respect to the mold opening/closing direction varies depending on the type of molding material, but is usually set to about 25 to 45 degrees.

On the other hand, 18 is an injection device, which has the injection nozzle 1 at its tip.
1, and this injection direction is perpendicular to the mold opening/closing direction. Reference numeral 20 denotes an ejecting device disposed in the internal hollow part of the movable mold 3, and includes ejecting pins 22 and 21 facing the cavity 15 and the runner groove 6. Protruding bottle 21
and 22 are attached to a protruding plate 24 which is urged rearward by a spring 23. Therefore, when the protruding plate 24 is pushed by the push rod 25, the protruding bottles 21 and 22 are moved forward, and the molded product Wo attached to the movable mold 3 can be separated from the movable mold 3. In addition, in order for the runner part of the molded product WO to adhere to the movable mold 3 when the mold is opened, the protruding pin 21 facing the runner groove 6 may be an undercut pin, a Z pin, etc. that catches the molded product WO, or The runner groove portion 6 is made into a tapered shape or a ring groove is formed.

Next, regarding the operation during molding using mold l, the second
This will be explained with reference to the figures and FIG. Figure 2 shows the injection process.
FIG. 3 is a longitudinal sectional view of the molding die showing the mold opening process.

First, as shown in FIG. 2, when the mold is closed and injection is performed with the injection nozzle 11 in contact with the nozzle touch part 5, the molding material (molten resin) W is transferred from the injection device 18 to the injection nozzle l11 and the nozzle touch part 5. , the sprue hole 7, the runner groove 6, the gate 16, and the cavity 15. When this injection step is completed and the mold is opened after cooling and solidifying through a predetermined pressure holding step, the molded product Wo adheres to the movable mold 3 and separates from the fixed mold 2.

After the mold opening is completed as shown in FIG. 3, the ejecting device 20 is operated to move the ejecting pins 21 and 22 forward, thereby allowing the molded product WO to be separated from the movable mold 3.

Thereafter, the mold is closed again and the next molding cycle is performed in the same manner. By the way, what should be noted is that the injection nozzle 11 in contact with the nozzle touch part 5 can remain as it is as shown in FIG. 3, and there is no need to move the injection device 18 back and forth during the molding cycle. A control unit becomes unnecessary.

Although the embodiments have been described in detail above, the present invention is not limited to such embodiments. For example, although a vertical injection device is illustrated for a horizontal mold clamping device, both are L-shaped. The vertical and horizontal relationships do not matter as long as they have a device relationship.

Other changes may be made in the configuration, shape, arrangement, quantity, etc., without departing from the gist of the present invention. .

〔Effect of the invention〕

As described above, the molding die according to the present invention is provided with a nozzle touch part that contacts the injection nozzle of the injection device on the side surface of the fixed mold, and communicates this nozzle touch part with the runner groove part provided on the parting surface through the sprue hole part. As a result, the following effects can be obtained.

- The injection nozzle can repeat the molding cycle while remaining in contact with the nozzle touch part of the molding die, simplifying the mechanism and control, and further improving molding efficiency.

■ There is no stringing phenomenon caused by molding material adhering to the injection nozzle, and it is possible to prevent the occurrence of flakes and damage to the mold.

■ Basically, it can be implemented by changing the position of the nozzle touch part, so it can contribute to easier implementation and lower costs.

[Brief explanation of the drawing]

Fig. 1.2 A longitudinal cross-sectional view of the molding die according to the present invention. Fig. 2: A longitudinal cross-sectional view of the molding die showing the injection process. Fig. 3: A longitudinal cross-sectional view of the molding die showing the mold opening process. , FIG. 4: A vertical cross-sectional view of a molding die according to a conventional example. In the drawings, l: Molding mold 2: Fixed mold 2a: Side surfaces 2p, 3p: Parting surface 3: Movable mold 5: Nozzle touch part 6: Runner groove part 7: Sprue hole W: Molding material patent applicant Nissei Plastics Kogyo Co., Ltd. Agent Patent Attorney 2 1) Shigeru Figure 1 Figure 2

Claims (1)

[Claims] In a mold consisting of a fixed mold and a movable mold, in which molding material is filled from a direction perpendicular to the mold opening/closing direction, a nozzle touch part is provided on the side surface of the fixed mold to which an injection nozzle of an injection device comes into contact, and this A molding die characterized in that a nozzle touch part and a runner groove part provided on a parting surface are communicated through a sprue hole part.