JPH065858Y2 - Injection mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an injection molding die, and more particularly to improvement of a sealing technique at a joint portion between a manifold and a joint manifold.

[Prior Art] An injection-molding die for molding a plurality of products at a time is composed of a fixed die and a movable die that can be opened and closed so as to form a plurality of cavities when closed. here,
The fixed mold includes a plurality of manifolds arranged on the back surface of the fixed mold plate and a joint manifold connected to the side portions of these manifolds by bolts. It is designed to be fed to the manifold and injected into each cavity.

[Problems to be Solved by the Invention] In the injection molding die described above, when the resin is injected, a force is generated to separate the manifold and the joint manifold due to the pressure of the resin in the manifold. However, in the above injection molding die, since the joint manifold and the manifold are connected only by the fastening force of the bolt, the bolt is extended by the pressure of the resin, which causes the gap between the abutting surfaces of the manifold and the joint manifold. There is a drawback that a gap is created in the resin and resin leakage occurs. So, in the past,
Although we try to prevent resin leakage by using large bolts and increasing the number of bolts, there was a problem that a large space for the bolts was required and the mold was unnecessarily enlarged. .

The present invention has been made in order to solve such problems, and an object thereof is to provide an injection molding die capable of reliably preventing resin leakage without enlarging the die. To do.

[Means for Solving Problems] In the injection molding die of the present invention, a fixed die and a movable die are provided so as to be opened and closed so as to form a plurality of cavities when closed, and the fixed die is fixed. A mounting plate, and a fixed template attached to the fixed mounting plate by abutting in the mold opening direction,
A manifold that is provided independently of each of the cavities on the back side of the fixed template and injects resin into the cavity, and is connected to the manifold,
In an injection molding die composed of a joint manifold for feeding resin to the manifold, the joint manifold and the manifold are butted against each other in the mold opening direction, and the joint manifold and the fixed mounting plate are connected to each other. At least the joint portion between the joint manifold and the manifold,
It is constructed by butting each other.

[Operation] In the injection-molding die having the above structure, the joint manifold and the manifold are butted against each other in the die opening direction, and the joint manifold and the fixed mounting plate are butted against each other. The joint manifold is strongly pressed against the manifold by the mold clamping force when closing the fixed mold and the movable mold, and there is no gap between the abutting surfaces of the two.

Moreover, since the joint manifold and the fixed mounting plate are butted against each other at least at the butted portion between the joint manifold and the manifold, the mold clamping force effectively acts on the joint portion between the joint manifold and the manifold, and the above-mentioned gap The effect of suppressing the occurrence is enhanced.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the outline of an injection molding die of an embodiment, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. It is a figure. The injection mold shown in these figures is composed of a fixed mold 1 and a movable mold 2 that can be moved toward and away from the fixed mold 1. When both are closed, the resin A A plurality of injected cavities 3 ... Are formed. Then, the fixed mold 1 is configured to branch the resin A injected from a predetermined location and inject it into each of the cavities 3, ..., And is configured as follows.

That is, reference numeral 4 in the drawing is a fixed mounting plate. A locate ring 5 and a nozzle touch 6 are attached to the central portion of the fixed attachment plate 4. The locate ring 5 guides a nozzle of an injection molding device (not shown). Also,
The nozzle touch 6 is for fitting the above nozzle,
Inside thereof, a hole 6a through which the resin A flows is formed. A joint manifold 7 is connected to the lower end of the nozzle touch 6. Joint manifold 7
A horizontal hole 8 that communicates with the hole 6a of the nozzle touch 6 is formed in the inside of, and a vertical hole 9 that communicates with the horizontal hole 8 is formed so as to intersect at right angles. Further, inside the joint manifold 7, heaters 10 ... For heating the resin are arranged. The joint manifold 7 as described above is provided with bolts (not shown) for the spacer 1
It is clamped and fixed to the fixed mounting plate 4 via 1.

Further, the fixed mold plate 12 is fixed to the fixed mounting plate 4 by the fixed receiving plate 13.
It is attached through (see FIG. 2). A plurality of fixed inserts 14 ... Are fixed to the lower portion of the fixed mold plate 12. As shown in FIG. 3, a plurality of gate bushes 15 ... Are attached to each fixed insert 14. A circular hole 16 through which the resin A flows is formed in the gate bush 15. The circular hole 16 is formed so that its diameter gradually decreases toward the lower end side, and a gate 17 communicating with the cavity 3 is formed at the lower end portion thereof. On the upper side of the fixed inserts 14 ..., A manifold 18 having a back surface abutted against the surface of the joint manifold 7 is arranged. The manifold 18 is also fastened and fixed to the joint manifold 7 by bolts (not shown). A lateral hole 20 communicating with the vertical hole 9 of the joint manifold 7 is formed inside the manifold 18, and a plurality of vertical holes 21 ... Communicating with the lateral hole 20 correspond to the position of the gate bush 15. Is formed. And in the vertical hole 21,
A holder 22 whose tip is located in the circular hole 16 of the gate bush 15 is screwed together.

An outer peripheral portion of the holder 22 is enlarged in a flange shape, and an end surface of the holder 22 abuts on an end surface of the gate bush 15. In addition, inside the holder 22,
The topede 23 is fitted. A plurality of holes 23a ... Are formed in the topede 23 so that the resin A can flow therethrough. Further, heaters 24 for heating the resin A are arranged inside the manifold 7.

Next, the operation in the case of injection molding with the injection molding die configured as described above will be described. First, when the resin A is supplied from the injection molding device (not shown) into the lateral holes 8 of the joint manifold 7, the resin A is passed through the lateral holes 8 into the lateral holes 20, 20 in each of the manifolds 18, 18.
Will be sent. Then, the resin A is injected from the lateral holes 20 of the manifold 18 through the holes 23a of the topede 23 into the respective cavities 3 from the gates 17 ... At this time, the pressure of the resin A in the joint manifold 7 and the manifold 18 causes a force to separate the two. However, since the joint manifold 7 abuts the fixed mounting plate 4 via the spacer 11,
The joint manifold 7 is strongly pressed against the manifold 18 by the mold clamping force when the fixed mold 1 and the movable mold 2 are closed, and a gap is not formed between the abutting surfaces of the two.
After filling the cavity 3 with the resin A, the movable mold 2 is separated from the fixed mold 1 and the molded product is taken out.

In such an injection molding die, there is no gap between the abutting surfaces of the manifold 18 and the joint manifold 7 due to the injection pressure when injecting the resin A, and the die is enlarged. It is possible to reliably prevent resin leakage without causing In the above embodiment,
Although the joint manifold 7 and the fixed mounting plate 4 are butted against each other via the spacer 11, the back surface of the joint manifold 7 may be directly butted to the surface of the fixed mounting plate 4, and the joint manifold 7 has a substantially total length in the length direction. It is also possible to abut over each other.

[Effect of the Invention] As described above, in the injection molding die of the present invention, the fixed mold and the movable mold are openably and closably provided so as to form a plurality of cavities when closed, and the fixed mold is A fixed mounting plate, a fixed template mounted on the fixed mounting plate by abutting in the mold opening direction, and arranged on the back side of the fixed template independently corresponding to each of the cavities,
In a mold for injection molding comprising a manifold for injecting resin into the cavity and a joint manifold connected to the manifold for feeding resin to the manifold, the joint manifold and the manifold are arranged in a mold opening direction. Butt and connect each other,
In addition, since the joint manifold and the fixed fixing mounting plate are configured to abut against each other at least at the abutting portion of the joint manifold and the manifold, the joint manifold forms the manifold by the tightening force when closing the fixed die and the movable die. Is strongly pressed by. Therefore, the injection pressure at the time of injecting the resin does not cause a gap between the abutting surfaces of the manifold and the joint manifold, and the resin leakage can be surely prevented without increasing the size of the mold. Is obtained.

Moreover, since the joint manifold and the fixed mounting plate are butted against each other at least at the butted portion between the joint manifold and the manifold, the mold clamping force effectively acts on the joint portion between the joint manifold and the manifold, and the above-mentioned gap The effect of suppressing the occurrence is enhanced.

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention, FIG. 1 is a perspective view showing the outline of an injection molding die, and FIG. 2 is a view taken along line II-II in FIG. Sectional view, Fig. 3 is II of Fig. 1.
It is a sectional view taken along the line I-III. 1 ... Fixed type, 2 ... Movable type 3 ... Cavity, 4 ... Fixed mounting plate, 7 ... Joint manifold 12 ... Fixed type plate, 18 ... Manifold, A ... Resin.

Claims (1)

[Scope of utility model registration request] 1. A fixed mold and a movable mold are provided to be openable and closable so as to form a plurality of cavities when closed, and the fixed mold is fixed to the fixed mounting plate in the mold opening direction. A fixed mold plate mounted by butting, and a manifold which is arranged on the back side of the fixed mold plate so as to correspond to each of the cavities independently, and which injects resin into the cavity, and is connected to this manifold. In a mold for injection molding composed of a joint manifold for feeding resin to, the joint manifold and the manifold are abutted and connected to each other in the mold opening direction, and the joint manifold and the fixed mounting plate are at least The joint manifold and the manifold are butted against each other at the butted portion. Injection mold for.