KR20230130328A - Runner device for injection mold - Google Patents

Abstract

The present invention relates to a runner device for an injection mold that can control the discharge amount and discharge direction of resin discharged through a gate, including a sprue through which molten resin flows, a gate connected to the cavity of the mold to discharge resin, and the sprue. and a manifold on which a runner connecting the gate is formed, and a rotating core part that is fastened to the manifold so as to rotate around the portion where the gate is formed and controls the discharge amount and discharge direction of the resin discharged through the gate. With this configuration, the discharge amount and discharge direction of the resin discharged through the gate can be adjusted. When supplying resin through a multi-gate, the discharge amount can be adjusted to be the same or different for each gate, improving molding speed and quality of molded products. You can get the effect.

Description

Runner device for injection mold {RUNNER DEVICE FOR INJECTION MOLD}

The present invention relates to a runner device for an injection mold, and more specifically, to a runner device for an injection mold that can control the discharge amount and discharge direction of resin discharged through a gate.

In general, an injection molding machine for molding plastic products injects molten resin from a mold cylinder into a manifold, and the injected resin is distributed along a runner branched within the manifold and molds the product through a gate formed on the manifold. It is a device that injects into the cavity of a mold.

The manifold is formed with a sprue through which molten resin flows, a gate connected to the cavity of the mold to discharge the resin, and a runner through which the resin flows by connecting the sprue and the gate.

Here, when the gate is provided in plural and the resin is supplied to the cavity of the mold through a plurality of regions, the runner is branched from the sprue into a plurality to connect the sprue and the plurality of gates, respectively. It is connected to the gate and is formed to branch and supply resin.

In this way, when a plurality of gates are formed, the resin discharged from each gate is discharged in the same amount and supplied to the cavity.

However, it is necessary to supply a different amount of resin to each cavity connected to the gate or to vary the supply direction of the resin supplied to the cavity through the gate in response to the shape of the cavity, but with a conventional manifold, this There is a problem in that control of the discharge amount and discharge direction of the resin cannot be achieved.

In addition, when injection molding is completed by a conventional method, a gate-shaped injection product (G) and a runner-shaped injection product (R) are attached to the injection molded product (P), as shown in Figure 7 (a).

In this case, since a subsequent process is required to cut the gate-shaped injection product (G) from the injection molded product (P), there is a problem of increased manufacturing cost and manufacturing time.

Korean Patent No. 10-1296355 (2013.08.07)

The present invention was created to solve the above problems, and its purpose is to provide a runner device for an injection mold that can control the discharge amount and discharge direction of resin discharged through a gate.

In addition, the purpose of the present invention is to provide a runner device for an injection mold that can exclude the subsequent process for gate cutting by closing the gate when the supply of resin to the cavity of the mold is completed.

In order to achieve the above object, a runner device for an injection mold according to a preferred embodiment of the present invention includes a sprue through which molten resin flows, a gate connected to the cavity of the mold to discharge the resin, and the sprue and the A manifold with runners connecting the gates; and a rotating core part that is coupled to the manifold to rotate at the portion where the gate is formed and controls the discharge amount and discharge direction of the resin discharged through the gate.

In addition, the rotating core unit may be configured to close the gate when supply of resin to the cavity of the mold is completed.

For example, the rotating core part includes a rotating body that is installed to be rotated by being inserted into an insertion groove formed in the manifold, one side of which is in communication with the runner, and the other side of which is formed with a flow path in communication with the gate; And a driving unit that rotates the rotating body.

In addition, when the supply of resin to the cavity of the mold is completed, the rotating core unit may cause the driving unit to rotate the rotating body so that the flow path leaves the gate, so that the rotating body closes the gate.

For example, the driving unit may include a pinion gear fastened to an end of a rotating shaft protruding from the rotating body; A rack gear that rotates the pinion gear while moving in a straight line; an actuator that moves the rack gear in a straight line; and a fastening part inserted into the rotating shaft, positioned between the rotating body and the pinion gear, and fastened to the manifold to support the rotating body.

According to the runner device for an injection mold according to the present invention, the discharge amount and discharge direction of the resin discharged through the gate can be adjusted, so when resin is supplied through a multi-gate, the discharge amount can be adjusted to be the same or different for each gate, thereby improving the molding speed and molded product. The effect of improving the quality can be achieved.

And, according to the present invention, when the supply of resin to the cavity of the mold is completed, the gate can be closed to exclude the subsequent process for gate cutting, which can achieve the effect of reducing manufacturing cost and manufacturing time.

In addition, according to the present invention, when the supply of resin to the cavity of the mold is completed, the gate can be closed to recycle the resin remaining in the runner of the manifold, which can achieve the effect of reducing manufacturing costs.

1 is a perspective view schematically showing a runner device for an injection mold according to an embodiment of the present invention;
Figure 2 is an exploded perspective view schematically showing a runner device for an injection mold according to an embodiment of the present invention;
Figure 3 is a rear view schematically showing a runner device for an injection mold according to an embodiment of the present invention;
Figure 4 is a diagram schematically showing the state in which the runner device for an injection mold according to an embodiment of the present invention is installed in the mold;
Figure 5 is an enlarged view schematically showing the rotated state of the rotating core part by extracting area A of Figure 4;
Figure 6 is an enlarged view schematically showing a state in which the rotary core part is rotated and the gate is closed by extracting area A of Figure 4;
Figure 7 (a) is a diagram schematically showing an injection molded product manufactured using a conventional runner device for an injection mold.
Figure 7 (b) is a diagram schematically showing an injection molded product manufactured using a runner device for an injection mold according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be interpreted as including all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries can be interpreted as having meanings consistent with the meanings they have in the context of related technologies, and unless clearly defined in this application, are interpreted as having an ideal or excessively formal meaning. It may not work.

Hereinafter, specific embodiments of the present invention will be described with reference to the attached drawings.

Figures 1 and 2 are a perspective view and an exploded perspective view schematically showing a runner device for an injection mold according to an embodiment of the present invention, Figure 3 is a rear view schematically showing the runner device for an injection mold, and Figure 4 is a This is a drawing schematically showing the state in which the runner device for the injection mold is installed in the mold, and FIGS. 5 and 6 are enlarged views schematically showing the state in which the rotating core part is rotated by extracting area A of FIG. 4.

In addition, Figure 7 (a) is a diagram schematically showing an injection molded product manufactured using a conventional injection mold runner device, and Figure 7 (b) shows a runner device for an injection mold according to an embodiment of the present invention. This is a drawing schematically showing an injection molded product manufactured using this method.

Referring to Figures 1 to 7, the runner device 100 for an injection mold according to an embodiment of the present invention includes a manifold 200 formed to supply resin to the cavity 11 of the mold 10, and the manifold ( It includes a rotating core unit 300 that adjusts the discharge amount and discharge direction of the resin discharged through the gate 222 formed in 200).

The manifold 200 includes a sprue 211 through which molten resin flows, a gate 222 connected to the cavity 11 of the mold 10 to discharge the resin, and the sprue 211 and the It includes a runner 221 connecting the gate 222.

Here, the manifold 200 may be composed of an upper manifold 210 on which the sprue 211 is formed, and a lower manifold 210 on which the runner 221 and the gate 222 are formed.

In a state in which the gate 222 of the manifold 200 is disposed in communication with the cavity 11 of the mold 10, molten resin is supplied to the sprue 211 through a resin supply nozzle (not shown). When supplied through the resin, the supplied resin flows along the runner 221 and then is discharged through the gate 222 and supplied to the cavity 11 of the mold 10.

Here, when the gates 222 are formed in plural as shown in the drawing, the runner 221 branches off from a portion communicating with the sprue 211 and communicates with each of the gates 222. It is formed to supply resin to the gate 222.

The rotating core unit 300 is fastened to the manifold 200 to rotate at the portion where the gate 222 is formed, and is configured to control the discharge amount and discharge direction of the resin discharged through the gate 222.

For this purpose, the rotating core unit 300 includes a rotating body 310 that is rotatably installed on the manifold 200 and has a flow path 311 connecting the runner 221 and the gate 222, and It includes a driving unit 320 that rotates the rotating body 310.

The rotating body 310 is formed in a cylindrical shape and is installed to be inserted into the insertion groove 223 formed in the manifold 200 and rotated.

In addition, the flow path 311 in the form of a groove is formed on one side of the rotating body 310 on the side where the gate 222 is formed.

One side (311a) of the flow path 311 is in communication with the runner 221, and the other side (311b) is in communication with the gate 222, so that the resin flowing in through the runner 221 is connected to the gate 222. It can be discharged.

In addition, one side (311a) of the flow path 311 that communicates with the runner 221 is formed to have the same size as the flow path size of the runner 221, and the other side (311b) that communicates with the gate 222 is formed with the same size as the flow path size of the runner 221. It may be formed to have the same size as the gate 222.

With this configuration, when the rotating body 310 is not rotated, as shown in (a) of FIG. 5, the other side 311b of the passage 311 is positioned to coincide with the gate 222. The maximum discharge amount of resin can be discharged.

And, as shown in (b) of 5, when the rotating body 310 is rotated counterclockwise, the other side 311b of the passage 311 moves counterclockwise, thereby causing the gate 222 The area communicating with is reduced, allowing the discharge amount of resin to be controlled. At this time, the resin discharged through the other side 311b of the flow path 311 is supplied at an angle to the right based on the drawing, so the discharge direction of the resin can also be adjusted.

Alternatively, as shown in (c) of 5, when the rotating body 310 is rotated clockwise, the other side 311b of the passage 311 moves clockwise and communicates with the gate 222. As the area is reduced, the discharge amount of resin can be adjusted. At this time, the resin discharged through the other side 311b of the passage 311 is supplied at an angle to the left based on the drawing, so the discharge direction of the resin can also be adjusted.

Therefore, since the rotation core unit 300 can be adjusted to rotate individually after installing each of the plurality of gates 222 formed on the manifold 200, the shape and size of the cavity 11 and the gate 222 ) It is possible to perform efficient resin supply by individually adjusting the discharge amount and discharge direction of the resin discharged through each gate 222 according to various conditions such as the position of the gate 222.

The driving unit 320, as an example, includes a pinion gear 321 fastened to the end of the rotating shaft 312 protruding from the other side of the rotating body 310, and a gear that rotates the pinion gear 321 while moving in a straight line. It may include a rack gear 322 and an actuator 323 that moves the rack gear 322 in a straight line.

With this configuration, when the actuator 323 operates to move the rack gear 322 in a straight line, the pinion gear 321 rotates in response, thereby rotating the rotating body 310.

Of course, the configuration for rotating the rotating body 310 is not limited to this, and various known configurations can be applied.

And, the drive unit 320 is inserted into the rotation shaft 312 and located between the rotation body 310 and the pinion gear 321, and is fastened to the manifold 200 to support the rotation body 310. It may further include a fastening part 324.

Here, the fastening part 324 is formed larger than the diameter of the insertion groove 223 into which the rotating body 310 is inserted and is fastened to the manifold 200 while supporting the rotating body 310. It can be fully equipped.

Additionally, the rotating core unit 300 may rotate to close the gate 222 when the supply of resin to the cavity 11 of the mold 10 is completed.

In the case of injection molding using a conventional manifold not provided with the rotating core unit 300, as shown in FIG. 7 (a), a gate-shaped injection product (G) and a runner-shaped injection molded product (P) are added to the injection molded product (P). The injection product (R) is attached.

In this case, a subsequent process is required to cut the gate-shaped injection molded product (G) from the injection molded product (P).

However, the runner device 100 for an injection mold according to an embodiment of the present invention includes a rotating core portion 300 at the gate 222.

With this configuration, when the supply of resin to the cavity 11 is completed, as shown in FIG. 6, the driving unit 320 moves the rotating body 310 so that the passage 311 leaves the gate 222. When the rotating body 310 closes the gate 222 by rotating, the gate-shaped injection molded product G is not connected to the injection molded product P.

At this time, the outer peripheral surface of the rotating body 310 exposed to the gate 222 when inserted into the insertion groove 223 is on the same plane as the side of the manifold 200 where the gate 222 is formed. The rotating body 310 is installed to be positioned.

Therefore, as shown in (b) of FIG. 7, only the injection molded product P formed by the cavity 11 of the mold 10 is manufactured, so a subsequent process for cutting the gate-shaped injection product is not necessary.

Additionally, by closing the gate 222, the resin remaining in the runner 221 can be recycled without being discarded.

Although the present invention has been described in detail through specific examples, this is for detailed explanation of the present invention, and the present invention is not limited thereto, and the present invention is intended to be understood by those skilled in the art within the technical spirit of the present invention. It is clear that modification or improvement is possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

100: Runner device for injection mold 200: Manifold
210: upper manifold 220: lower manifold
211: Sprue 221: Runner
222: gate 223: insertion groove
300: Rotating core part 310: Rotating body
311: Euro 311a: One side
311b: Other side 312: Rotation axis
320: Drive unit 321: Pinion gear
322: rack gear 323: actuator
324: fastening part

Claims (5)

A manifold including a sprue into which molten resin flows, a gate connected to the cavity of the mold to discharge the resin, and a runner connecting the sprue and the gate; and
a rotating core part that is fastened to the manifold to rotate at a portion where the gate is formed and controls the discharge amount and discharge direction of the resin discharged through the gate;
Runner device for injection mold including.
According to paragraph 1,
The rotating core part,
A runner device for an injection mold, characterized in that the gate is closed when the supply of resin to the cavity of the mold is completed.
According to paragraph 1,
The rotating core part,
a rotating body that is inserted into the insertion groove formed in the manifold and installed to rotate, one side of which is in communication with the runner, and the other side of which is formed with a flow path in communication with the gate; and
A driving unit that rotates the rotating body;
A runner device for an injection mold comprising a.
According to paragraph 3,
The rotating core part,
A runner device for an injection mold, wherein when the supply of resin to the cavity of the mold is completed, the driving unit rotates the rotating body so that the flow path leaves the gate, and the rotating body closes the gate.
According to paragraph 3,
The driving unit,
a pinion gear fastened to an end of a rotating shaft protruding from the rotating body;
A rack gear that rotates the pinion gear while moving in a straight line;
an actuator that moves the rack gear in a straight line; and
A fastening part inserted into the rotating shaft, located between the rotating body and the pinion gear, and fastened to the manifold to support the rotating body;
A runner device for an injection mold comprising a.