KR20080010222A - Multi Injection Mold - Google Patents

Abstract

According to the present invention, the multi-injection mold is for injection molding a product formed by combining resins which are not fused to each other, and a lower mold having first and second cavities formed to mold different release materials, respectively; An upper mold which opens and closes the first and second cavities by being molded and separated from the lower mold; Index shafts rotatably mounted to the lower mold, first and second cores installed on the index shafts and selectively positioned on the first and second cavities, and lifted by actuators coupled to the index shafts and installed in the injection molding machine. And indexing means having a rotatable connection.

Description

Multi component injection mold

1 is an exploded perspective view showing an injection molded product according to the present invention;

2 is an exploded perspective view of a multi injection mold according to the present invention;

3 and 4 are cross-sectional views of the multi-injection mold according to the present invention,

5 is a perspective view showing a core for forming a lifting plate and an eject pin and a coupling part of a multi-injection mold according to the present invention;

6 is a cross-sectional view showing a state of forming a through-hole of the coupling portion;

7 is a cross-sectional view showing a state in which the first and second injection products are combined;

8 is a perspective view illustrating a stopper for defining an index axis and a rotation angle thereof;

The present invention relates to an injection mold, and more particularly to a multi injection mold capable of multiple injection by rotating the core using the index axis.

In general, multi-colored products having two or more colors or multi-products having two or more structures in one product are adopting a multi-injection method to reduce the trouble of manufacturing them in several sets.

This multi-injection method is an insert method for mounting and injecting a different product into a mold, and two different molds are manufactured and mounted at the same time in one injection machine, and after the first product injection, the movable side template is rotated to perform the second injection. A rotary method for injecting a product and a tentable method for injecting secondary and tertiary products by rotating the movable template after injection of the primary product are used.

The insert method has a problem in that workability for manufacturing an injection product is inferior, a production cost is relatively high, and the turntable method has a problem in that an injection machine and a mold are relatively large.

Republic of Korea Patent Publication No. 2000-0049735 discloses a multi-injection mold structure, and Patent No. 10-0091724 discloses a multi-injection mold rotary injection machine.

And Patent Publication No. 2002-0064859 discloses a multi-injection mold by the rotation method, registered Utility Model No. 0317955 discloses a rotary operation structure of the rotary multi-injection mold. The disclosed injection mold is capable of performing injection molding operations of different materials by rotating and rotating the rotating plate in a cylinder and rack pinion manner. However, this injection molding method is relatively complicated in structure because the rotation and elevating means is installed in the mold, and the productivity cannot be improved.

The present invention is to solve the problems described above, the structure is relatively simple, it is easy to apply a mechanical bonding structure when molding a synthetic resin product that is not chemically bonded, it is possible to reduce the production cost of the manufacturing The purpose of the present invention is to provide a multi-injection method and an injection mold thereof.

Another object of the present invention is to provide a multi-injection method capable of double-molding a product having a complicated shape and structure of an injected product, and an injection mold thereof.

In order to achieve the above object, the present invention is a multi-injection method

Injection molding a product made of a resin that is not fused with each other,

Rotating the index shaft rotatably installed in the lower molds having the first and second cavities so as to form different release materials, respectively, and the core rotation to position the first and second cores installed on the index shaft to the first and second cavities. Steps,

Sealing the first and second cavities by coupling the fixed mold and the upper mold, to which the core is mounted, and a first injection step of forming a first member for injecting the first resin into the first cavity;

An indexing step of separating the upper mold from the fixed mold and raising the index axis to support the first member in the second cavity while being supported by the first core;

The upper mold is coupled to the fixed mold, and the first injection product and the second injection product are injected into the first and second cavities, respectively, to mold the first injection product coupled to the first injection product mounted on the first cavity. Characterized in that it comprises a second injection step.

The multi-injection mold according to the present invention for achieving the above object is to injection molding a product made by combining a resin that is not fused with each other,

A lower mold having first and second cavities formed therein to mold different release materials; An upper mold which opens and closes the first and second cavities by being molded and separated from the lower mold;

An index shaft rotatably mounted to the lower mold, first and second cores mounted on the index shaft and selectively positioned on the first and second cavities, and lifted by an actuator coupled to the index shaft and installed in the injection molding machine. And an indexing means having a connecting portion which is rotated.

Hereinafter, a multi-injection method and an embodiment of the injection mold according to the present invention will be described in detail with reference to the accompanying drawings.

The injection method according to the present invention is for injection molding one product by using two different materials, that is, chemically unbonded resins (uncompatible resins), which are different from each other when injection molding a product. Multi-stage injection molding is performed by using a resin injected in each cavity while transferring the first injection-molded product firstly formed using the cavities corresponding to the number of release resins not transferred to each cavity using a core installed on the index shaft.

The injection method according to the present invention is a release mold forming a product to be injection molded, that is, between the fixed mold formed with the first and second cavities corresponding to the number of materials not fused with each other, and between the first and second cavities Preparing an indexing unit having a 1.2 core installed in the index axis that is rotatably installed and positioned in the first and second cavities, and an upper mold for opening and closing the first and second cavities, which are combined with the fixed mold and separated from the fixed mold. Steps,

A core mounting step of rotating the index shaft rotatably installed in the lower mold having the first and second cavities so as to mold different release materials, respectively, and placing the first and second cores in the first and second cavities; A combining step of sealing the first and second cavities by combining the fixed mold and the upper mold, on which the core is mounted, and a first injection molding part which is a part of a product injecting the first resin into the first cavity. And an injection step, and an indexing step of separating the upper mold from the fixed mold and supporting the first core in the second cavity while the first injection product is supported on the first core using the index axis.

In the first injection step, it may further include a coupling part forming step of forming a coupling portion of the combination of the second injection article described later in the first injection article. The coupling portion formed by the coupling portion forming step may be formed by forming through holes or protrusions. In the indexing step, since the first member is transferred to the second cavity while being mounted on the core, it is unnecessary to separately eject the product.

In addition, the upper mold is coupled to the fixed mold, and the first and second resins are injected into the first and second cavities, respectively, to inject a second injection product coupled to the first member mounted on the first cavity. The second injection step is performed to mold a second injection article for the first injection article. In this process, the first injection article is filled with the resin forming the second injection article in the coupling portion formed in the first injection article, and the first injection article made of the release material is firmly fixed to each other.

On the other hand, one embodiment of an injection mold for injection molding a product made of a resin that is not chemically bonded is shown in Figures 1 to 5.

Referring to the drawings, the injection mold according to the present invention is provided on the lower mold 10, the index shaft 21 which is installed on the lower mold 10 to be rotatable and rotatable, and the index tm shaft 21 Indexing means 20 having first and second cores 23 and 24 installed on the support member 22 and a connection part 27 coupled to the index shaft 21 and lifted and rotated by an actuator installed in the injection molding machine. ) And the lower mold 10 and the first and second cores 23 and 24 or the first and second cores 23 and 24 are combined to form the first and second injection products 110 and 120, respectively. The upper mold 30 is formed to form the first and second cavities 25 and 26.

Referring to the injection mold configured in this way in more detail as follows.

The lower mold 10 is supported by the support members 12 installed on the fixed plate 11. And the lifting plate 13 is installed on the lower side of the lower mold 10, that is, the space between the lower mold 10 and the fixing plate (11). The lifting plate 13 may be provided with an eject pin 14, a core 15 for forming the coupling portion 130, and the like. And one side of the lower mold 10 is provided with a cylinder 16 for elevating the elevating plate 13, the rods 17 of the cylinders 16 are respectively installed on the edge of the elevating plate 13 do. Here, as shown in FIGS. 5 to 7, the cores forming the through-holes 131 of the coupling part 130 of the first and second injection-out products 110 and 120, which are each formed of the release material to form a product, respectively. Is preferably formed along the edge where the first injection article 110 and the second injection article 120 is coupled.

The eject pins 14a formed in the first cavity of the eject pins 14 and for ejecting the first injection product 110 from the lower mold during indexing after forming the first injection product 110 are lower molds 10 It is preferable to install on the side. Although not shown in the drawing, the lower mold 10 may have cooling lines for cooling during injection of the first and second injection molding products 110 and 120.

The indexing means 20 is a first injection product 110 injecting a core material of the inside of the lower mold 10 to the first resin after injection of one material as the first injection molding of a product using two different materials ) And at the same time by rotating the position 180 ° (when having two cavities) to enable the injection using the secondary resin, the first and second formed on the lower mold 10 as described above Index shafts 21 are provided between the cavities 25 and 26 so as to be lifted and rotated, and the first and second cores 23 are provided on the support members 22 installed on the index shafts 21. (24). As shown in FIG. 8, the index shaft 21 is provided with a means for indexing, that is, a groove installed at a predetermined angle on the outer circumferential surface of the index shaft 21 so as to enable accurate rotation angle setting with respect to the lower mold 10. It may be provided with a stopper (21c) is installed in the 21a) (21b) and the lower mold 10 and elastically biased to the groove side by a spring (not shown).

The first and second cores 23 and 24 are for forming the first and second injection products 110 and 120, and the inside of the cavity formed by the lower mold 10 and the upper mold 30. The first cores 23 and 24 may be formed to form a cavity for forming a product, or may be formed in a part of the cavity or partitioned into the upper mold 30. The first and second cores 23 and 24 may be formed of a product to be molded. The first core should be able to partition the first cavity so as to form a product formed in one kind of resin, that is, a first injection product, and the second core may have a first shape. It has a structure which can partition the 2nd cavity which can shape | mold a 2nd injection product in addition to a 1st injection product in the state which injection molding is completed. Here, it supports with the said 1st, 2nd core 23 (24). The member 22 may be formed of a single plate member, and the first and second cores 23 and 24 may be male. For example, if the molding resin is made of PVC, the gas may be generated and rust may occur, so that the molding resin may be made of stainless steel that is not rusted. When the size of the relatively large for ease of processing, the first and second core or the fixed mold 10 and the upper mold 30 can be divided and processed.

The indexing means 20 further includes a connecting portion 27 coupled with the index shaft 21 and lifted and rotated by an actuator installed in the injection molding machine. The connecting portion 27 has a housing 27a installed in the injection molding machine and a connecting shaft 27b extending from the housing. Here, the connection part 27 is not shown in the figure, but is lifted by a cylinder installed in the injection molding machine and the stepping motor is rotated at an angle set by a separate actuator.

Referring to the action of the multi-injection mold according to the present invention configured as described above and the multi-injection method through the same in detail as follows.

In order to mold the product using the multi-injection mold according to the present invention, first, the fixed mold 10, which is the fixed side mold, and the upper mold 30, which is the movable side mold, are mounted on the injection machine. At this time, the connection portion 27 connected to the index shaft 21 installed in the fixed mold 10 is connected to the cylinder and the motor for forward and reverse rotation, although not shown in the figure.

 In this state, the index shaft 21 is lowered by the cylinder, and the first and second cores 23 and 24 supported by the support member 22 are positioned in the first and second cavities 25 and 26. The upper mold, which is the movable side mold, descends to partition the first and second cavities 25 and 26. In this state, the resin is injected into the first cavity, which is the molding space, through the sprue bush and the runner using a nozzle. At this time, the through hole 131 forming the coupling part 130 is formed by the core installed on the lifting plate installed in the injection mold.

As described above, when the first injection molding is completed, the upper mold 30 is opened and the index shaft 21 is raised to support the first and second cores 23 and 24 supported by the support member 22. Separated from. At this time, the eject pin 14a installed on the fixed mold 10 side separates the first injection product from the fixed mold.

The elevated index shaft 21 is lowered after being rotated while being supported on the first core by the first injection article, and is positioned on the second cavity 26 side. In this state, the lower mold 10 and the upper mold 30 are combined, and the second resin is injected into the second molding space through the nozzle to mold the second injection article for the first injection article to complete the product.

In this case, the second injection article for the first injection article may be injected with a resin constituting the second injection article at a coupling portion formed during molding of the first injection article to increase the bonding force between the release resins.

By alternately providing a plurality of first and second cores of the multi-injection mold, continuous production is possible by allowing the first and second injection products to be molded simultaneously on both sides.

As described above, the multi-injection mold according to the present invention can continuously produce products having different materials that are chemically bonded, that is, unfused, by using a single mold, thereby improving productivity, and forming a product. The bonding force between the first and second injection products can be increased.

 Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (4)

Injection molding a product made of a resin that is not fused with each other, A core rotation step of rotating the index shaft rotatably installed in the lower mold having the first and second cavities so as to mold different release materials, respectively, and placing the first and second cores in the first and second cavities; , Sealing the first and second cavities by coupling the fixed mold and the upper mold, to which the core is mounted, and a first injection step of forming a first member for injecting the first resin into the first cavity; An indexing step of separating the upper mold from the fixed mold and raising the index axis to support the first member in the second cavity while being supported by the first core; The upper mold is coupled to the fixed mold, and the first injection and second resin are injected into the first and second cavities, respectively, to form a second injection article coupled to the first injection article mounted on the first cavity. Multi injection method characterized in that it comprises a second injection step. The method of claim 1, In the first injection step, the multi-injection method further comprises a coupling part forming step of forming a coupling part for coupling the first injection product and the second injection product formed in the second injection step. . Injection molding a product made of a resin that is not fused with each other, A lower mold having first and second cavities formed therein to mold different release materials; An upper mold which opens and closes the first and second cavities by being molded and separated from the lower mold; Index shafts rotatably mounted to the lower mold, first and second cores installed on the index shafts and selectively positioned on the first and second cavities, and lifted by actuators coupled to the index shafts and installed in the injection molding machine. And an indexing means having a connecting portion rotated. The method of claim 1, And a coupling part forming core for forming a through hole in the coupling part where the first injection product and the second injection product are coupled to the lower mold or the first core.

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