KR20230066295A - Container injection mold without runner - Google Patents

Abstract

The present invention relates to an injection mold on a container inlet side, which comprises: a movable core that is installed on an upper part of a lower mold to be raised and lowered together with the lower mold, has a movable surface formed at the top, and forms an inner space of an injection container; a fixed core that is installed at a lower part of the upper mold and forms a container inlet of the injection container; and an auxiliary core that is provided through the center of the fixed core and has a fixed surface coming in close contact with the movable surface and an injection hole for injecting molten resin. A coupling step is formed protruding at the top of the auxiliary core, and a step part corresponding to the coupling step is formed on an inner upper side of the fixed core. The container inlet injection mold without runner of the present invention reduces costs by shortening the work process by not requiring separate separation and removal of the injection container and runner.

Description

Container injection mold without runner}

The present invention relates to a container inlet side injection mold, and more particularly, to a container inlet injection mold without a runner, which does not require separate separation and removal of an injection container and a runner, thereby reducing costs by shortening a work process.

A general injection mold consists of a stationary mold and a movable mold, and when the movable mold is coupled to the stationary mold, a cavity is formed in which the injection container is formed by injecting molten resin between them.

In order to mold an injection container, molten resin is injected into the cavity in the mold through a sprue, runner, and gate, etc., and when the injected molten resin is cooled and solidified, the movable side mold It is separated from the mold to extract the molded product.

In this way, the molten resin supplied from the injection mold is filled into the cavity through the sprue, runner, and gate of the mold and then solidified. When the solidified injection container is separated from the mold, the sprue, runner, and gate, which are unnecessary parts, also Since they are taken out together, a post-process is required to remove unnecessary burrs from the injection container.

In order to solve the above problem, Patent Document 1 is mutually coupled to the lower side of the fixed side attachment plate and the fixed side attachment plate on which the sprue bush is provided to form a cavity of a predetermined shape, and the upper and lower mold plates The first ejector pin installed at the lower center of the injection container molded into a certain shape to punch out the gate, the upper and lower ejector plates connected to the first ejector pin and moving up and down, and the upper and lower ejector plates installed inside the upper and lower ejector plates for injection molding. Disclosed is a configuration in which the upper and lower mold plates are mold-opened through a mold including a second ejector pin that separates the container and a movable side attachment plate that opens the upper and lower mold plates, and then the upper and lower ejector plates are raised to punch out the gate.

In the case of conventional gate cutting devices driven by hydraulic or pneumatic cylinders, spring elastic mechanisms, etc., the conventional patent document 1 has a complicated configuration and difficult installation problems.

On the other hand, Patent Document 2 is a movable mold consisting of concave-convex projections protruding on both sides of the movable surface, runner forming grooves formed on the movable surface and the concave-convex projections, and resin supply holes formed on the concave-convex projections and communicating with the runner forming grooves; a fixed mold comprising a fixed surface in close contact with the movable surface, a concave-convex groove coupled to correspond to the concave-convex protrusion, and a main injection hole communicating with the runner forming groove; A configuration was proposed with a side mold installed between the fixed mold and the movable mold to form the cavity of the injection container.

Therefore, a separation operation is not required, but there is a problem in that the remaining cavity portion of the injection container must be removed by post-processing.

KR 20-1998-0021974 U KR 10-2197381 B1

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to improve the core shape of the mold so that separate separation and removal of the injection container and runner is not required, reducing the cost by shortening the work process It is to provide a container inlet injection mold without a runner to do.

In order to achieve the above object, a movable core installed on top of the lower mold so as to be able to move up and down together with the lower mold, having a movable surface formed on the upper end, and forming an inner space of the injection container; a fixed core installed under the upper mold and forming an inlet of the injection container; It is provided through the center of the fixed core and includes a secondary core having a fixed surface in close contact with the movable surface and an injection hole for injecting molten resin. It provides a container inlet injection mold without a runner, characterized in that a stepped portion corresponding to the coupling jaw is formed on the inside of the upper end.

Here, the fixed core is formed through the center of the fixed core in the through hole through which the auxiliary core passes, and at one side of the fixed core, two injection holes through which molten resin is injected along the longitudinal direction are formed through a part of the fixed core. to be

And, it is characterized in that a stepped groove portion for forming a protruding ring portion is further formed on the upper surface of the container inlet side passage on the fixed surface positioned between the fixed core and the auxiliary core.

By providing the present invention configured as described above, there is an effect of reducing costs by shortening the work process because separate separation and removal of the injection container and the runner are not required.

1 is an assembly configuration diagram showing an installation state of a container inlet injection mold without a runner according to the present invention.
2 is an exploded view showing the configuration of a container inlet injection mold without a runner according to the present invention.
3 and 4 are cross-sectional configurations showing the operating state of the runner-free container inlet injection mold according to the present invention.
5 is an exemplary view showing an injection container manufactured by a container inlet injection mold without a runner according to the present invention.

In describing the embodiments of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification. Terms used in the detailed description are only for describing the embodiments of the present invention, and should not be construed as limiting in any way. Unless expressly used otherwise, singular forms of expression include plural forms. In this description, expressions such as "comprising" or "comprising" are intended to indicate any characteristic, number, step, operation, element, portion or combination thereof, one or more other than those described. It should not be construed to exclude the existence or possibility of any other feature, number, step, operation, element, part or combination thereof.

In each system shown in the figures, elements in some cases may each have the same or different reference numbers to indicate that the elements represented may be different or similar. However, elements may have different implementations and work with some or all of the systems shown or described herein. Various elements shown in the drawings may be the same or different. Which one is called the first element and which one is called the second element is arbitrary.

In this specification, when one component 'transmits', 'transmits', or 'provides' data or signals to another component, it means that one component directly transmits data or signals to another component, It involves transmitting data or signals to another component through at least one other component.

Prior to describing the embodiments of the present invention, a container inlet injection mold without a runner applied to the present invention will be described.

1 is an assembly configuration diagram showing the installation state of a container inlet injection mold without a runner according to the present invention, Figure 2 is an exploded view showing the configuration of a container inlet injection mold without a runner according to the present invention, Figures 3 and 4 are the present It is a cross-sectional view showing the operating state of the runner-free container inlet injection mold according to the present invention, and FIG. 5 shows an exemplary view showing an injection container manufactured by the runner-free container inlet injection mold according to the present invention.

As shown in FIGS. 1 to 5 , the runnerless container inlet injection mold of the present invention may basically include a movable core 100 , a stationary core 200 and an auxiliary core 300 .

The movable core 100 is installed on the top of the lower mold 20 so as to be able to move up and down together with the lower mold 20, the movable surface 110 is formed on the top, and the inner space 11 of the injection container 10 is formed. can be formed

The lower mold 20 is provided at the lower part of the upper mold 30 to be able to move up and down, so that the movable core 100 can correspond to the fixed core 200 of the upper mold 30 .

The fixed core 200 is installed below the upper mold 30 and may form the container inlet 12 of the injection container 10 .

At this time, the auxiliary core 300 may be provided through the center of the fixed core 200, and the fixed surface 210 in close contact with the movable surface 110 and the injection hole 310 for injecting molten resin are located in the center. It can be formed vertically.

Therefore, while the lower mold mold 20 is brought into contact with the upper mold mold 30, a space for forming the injection container 10 is formed inside the core mold 40 provided therebetween, and is installed in the upper mold mold 30. The movable core 100 of the lower mold 20 may be in contact with the fixed core 200 to be in contact with each other.

At this time, the molten resin injected through the injection hole 310 of the auxiliary core 300 is supplied to the movable surface 110 and the fixed surface 210 while being distributed to the outside of the movable core 100 and the fixed core 200. An injection container 10 may be formed.

On the other hand, the coupling jaw 330 protrudes from the upper end of the auxiliary core 300, and the stepped portion 220 corresponding to the coupling jaw 330 is formed inside the upper end of the fixed core 200, so that the fixed core 200 The auxiliary core 300 is provided through the through hole 240 of the but may be provided with more protrusion than the fixing surface 210 of the auxiliary core 300.

2 to 4, the movable surface 110 temporarily accommodates the molten resin injected through the injection hole 310 and distributes it in the radial direction. On one side of the stationary core 200, Two injection holes 310 through which molten resin is injected may be formed through a part along the length direction.

Moreover, since the outlet of the injection hole 310 is located at the upper end of the injection vessel 10, a core in which molten resin is solidified is not generated in the passage 13 of the vessel inlet 12.

Therefore, it is preferable that the movable surface 110 and the fixed surface 210 are in surface contact with each other.

There is no groove for guiding molten resin at the location where the movable surface 110 and the fixed surface 210 correspond.

As shown in FIG. 5, the fixed surface 210 located between the fixed core 200 and the auxiliary core 300 has a protruding ring portion 14 on the upper surface of the passage 13 formed at the container inlet 12. ) A stepped groove portion 230 forming a may be further formed.

That is, when the movable core 100 and the fixed core 200 are closed, the stepped groove 230 is formed by fixing the position of the stepped groove 230 by abutting the stepped core 220 of the fixed core 200 with the coupling jaw 330 of the auxiliary core 300. can maintain its shape precisely.

The stationary core 200 may be formed through the through hole 240 through which the auxiliary core 300 passes through the center of the stationary core 200 .

Subsequently, molding of the injection container 10 is completed by the injection molding machine, and when the movable core 100 is retracted, the previously hardened molten resin of the runner can be removed without an ejector, and the passage 13 of the container inlet 12 There is no burr caused by molding.

By providing the present invention configured as described above, there is an effect of reducing costs by shortening the work process because separate separation and removal of the injection container and the runner are not required.

Optimal embodiments have been disclosed in the drawings and specifications, and specific terms have been used, but they are only used for the purpose of describing the embodiments of the present invention, and are used to limit the meaning or scope of the present invention described in the claims. it didn't happen Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: injection container 11: inner space
12: container inlet 20: lower mold
30: Upper mold 40: Core mold
100: movable core 110: movable surface
200: fixed core 210: fixed surface
220: step 300: auxiliary core
310: injection hole 330: coupling jaw

Claims (1)

The movable core 100 is installed on top of the lower mold 20 so as to be able to move up and down together with the lower mold 20, has a movable surface 110 formed on the top, and forms the inner space 11 of the injection container 10. )and;
a fixed core 200 installed under the upper mold 30 and forming the container inlet 12 of the injection container 10;
It is provided through the center of the stationary core 200 and includes a secondary core 300 having a stationary surface 210 in close contact with the movable surface 110 and an injection hole 310 for injecting molten resin. becomes,
A coupling protrusion 330 is protruded from the top of the auxiliary core 300, and a stepped portion 220 corresponding to the coupling protrusion 330 is formed inside the top of the fixed core 200, and the movable The surface 110 and the fixing surface 210 are in surface contact in correspondence with each other,
A stepped groove portion 230 forming a protruding ring portion 14 on the upper surface of the passage 13 formed in the container inlet 12 on the fixing surface 210 located between the fixed core 200 and the auxiliary core 300. ) is further formed,
The stationary core 200 is formed through the through hole 240 through which the auxiliary core 300 passes through the center of the stationary core 200,
On one side of the fixed core 200, two injection holes 310 through which molten resin is injected along the longitudinal direction are formed through a portion of the fixed core 200.

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