KR20090105480A - Index shaft and multi component injection mold utilizing the same - Google Patents

Abstract

PURPOSE: An index shaft and a multi injection mold using the same are provided to increase a degree of freedom according to a mould drawing by cooling a rotating index plate or core. CONSTITUTION: An index shaft of a multi injection mold comprises an axis body, a refrigerant inlet and a refrigerant outlet. The axis body is installed in one side of lower and upper molds to be rotated and elevated. The axis body supports cores(12,13) dividing a forming space. The axis body is connected by the core and a connector. The axis body is driven by an actuator. An actuator is established at the injection mold. The refrigerate inlet and the refrigerate outlet are formed in the longitudinal direction in the axis body. The refrigerate inlet and outlets supply and eject refrigerate to the core formed in a water jacket.

Description

Index shaft and multi component injection mold utilizing the same

The present invention relates to an injection mold, and more particularly, to an index axis for rotating a core installed in an upper mold or a lower mold and a multi injection mold using the same.

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 hassle that needs to be divided into 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 a single injection machine, and after the injection of the primary product, the movable side template is rotated for the second time. Rotary methods for injecting products and a turntable method for injecting secondary and tertiary products by rotating the movable side template after injecting the primary products are used.

Meanwhile, Korean Patent No. 1997-014980 discloses an injection mold used for plastic injection molding, and Korean Utility Model No. 1996-20684 discloses an injection molding mold. In addition, the Republic of Korea Patent Publication No. 2000-0049735 discloses a multi-injection mold structure, and Patent No. 10-0091724 discloses a rotary injection machine of a multi-injection mold.

In addition, Patent Publication No. 2002-0064859 discloses a multi-injection mold by a rotating method, and Utility Model No. 0317955 discloses a rotational operation structure of a rotary multi-injection mold, and Patent Publication No. 2002-0064859 The multi-injection mold apparatus by the rotation method is posted.

In addition, Korean Patent Laid-Open Publication No. 2004-0084340 discloses a rotary operating structure of a rotary multiple injection mold, and Patent Publication No. 2000-0053009 discloses an injection mold apparatus and a method thereof.

Since the injection molds described above have a structure supported by a rotating shaft in which a core, an ejector plate, and the like are rotatably installed in the lower mold or the lower plate, it is impossible to supply cooling water to the core or the lower plate. Therefore, the degree of freedom of mold design falls, and there is a problem that can not improve the quality of the molded product.

The present invention is to solve the problems as described above, it is possible to supply and discharge the cooling water for cooling the core or the rotating plate, and to provide an index shaft with a relatively simple structure and a multi-injection mold using the same.

Another object of the present invention is to cool the rotating core or index plate to increase the degree of freedom according to the mold design, multi-injection index shaft and multi-injection mold using the same that can improve the quality of the injection product The purpose is to provide.

In order to achieve the above object, the index axis of the multi-injection mold is

It is installed on at least one side of the upper and lower molds to be combined with each other to form a molding space, and is supported by a core which partitions the molding space, and is connected by a core and a connector and driven by an actuator installed in an injection molding machine. With the shaft body becoming

It is characterized in that it is provided with a cooling water supply and discharge means for supplying and discharging the cooling water in the water jacket formed in the core in the longitudinal direction in the shaft body.

In the present invention, the cooling water supply and discharge means includes a cooling water supply pipe portion and a cooling water discharge pipe portion formed in the longitudinal direction in the shaft body, the cooling water supply pipe portion and the cooling water discharge pipe portion are arranged at equal intervals in the circumferential direction.

Multi-injection mold according to the present invention for achieving the above object

An injection molding of a product in which resins that are not fused with each other are combined, and a lower mold having first and second molding spaces formed to mold different release materials; An upper mold to open and close the first and second molding spaces by being combined with the lower mold and separated from the mold; An index shaft rotatably installed in the lower mold, first and second cores installed in the index shaft and selectively positioned in the first and second molding spaces, and an actuator coupled to the index shaft and installed in the injection molding machine. An indexing means having a connecting portion which is lifted and rotated,

The index shaft includes a shaft body connected to the first and second cores, and a cooling water supply and discharge means formed in the lengthwise direction of the body to supply and discharge the cooling water to the water jacket formed on the first and second cores. It is characterized by that.

In the present invention, the cooling water supply and discharge means has a cooling water supply pipe portion formed in the longitudinal direction in the shaft body, and the cooling water discharge pipe portion formed in the longitudinal direction in the shaft body, the cooling water supply pipe portion and the cooling water discharge pipe portion It is arranged to maintain a uniform interval in the circumferential direction with respect to the longitudinal center of the body. And at the end side of the shaft body is formed a coupling hole connected to the cooling water discharge pipe portion and the cooling water discharge pipe portion.

 Index shaft of the present invention and the multi-injection mold using the same can be combined with the upper and lower molds to elevate the core forming part of the molding space and indexed to the correct position. In addition, the cooling water can be supplied to and discharged from the water jacket formed in the core, thereby increasing the design freedom of the core and improving the quality of the injected product.

The multi-injection mold according to the present invention is for injection molding a product using two different materials, that is, two chemically unbonded resins, when molding a product. 3 is shown.

Referring to the drawings, the multi-injection mold according to the present invention is directly connected to the lower mold 10, the index shaft 30, which is installed to lift and rotate the lower mold 10, and the index shaft 30 First and second cores 12 and 13 installed on the support member 11 connected to the index shaft, indexing means 50 for restraining the lifting and rotating of the index shaft 30 with respect to the lower mold; The lower mold 10 is provided with an upper mold 30 which is joined to the first and second cores 12 and 13 to form first and second molding spaces 111 and 112 for forming an injection molded product.

The index shaft 30 is connected to the driving device of the injection molding machine as shown in FIGS. 2 and 3 to raise and lower the core, and supports the first and second cores 12 and 13. It is formed in the longitudinal direction on the shaft main body 32 and the shaft main body 32 connected by the member 11 and the connector 31, the support member 11 and the first and second cores 12, 13 Cooling water supply and discharge means 40 for supplying and discharging cooling water to the cooling line (12a, 13a) for cooling the first and second cores (12, 13) during molding, that is, the water jacket formed in It is provided.

The shaft main body 32 is slidably installed in the lower mold, the first shaft member 32a for indexing, the second shaft member 32b and the second shaft connected to the first shaft member 32a. And a connecting member 32c connected to the member 32b, which 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 to lift the index shaft. And rotate at a predetermined angle.

Cooling water supply and discharge means 40 is the cooling water supply pipe portion 41 formed in the longitudinal direction on the shaft body formed in the longitudinal direction on the first and second shaft members (32a, 32b) of the shaft body (32), Cooling water discharge pipe portion 42 is formed in the longitudinal direction in the shaft body (32). The cooling water supply pipe part 41 and the cooling water discharge pipe part 42 may be formed with a through hole formed in the longitudinal direction in the shaft main body 32, or a hollow part may be formed in the longitudinal direction in the shaft main body 32, and the cooling water discharge pipe may be formed in the hollow part. And cooling water supply lines can be arranged. On the other hand, the lower end of the shaft body 32, the coupling holes 43, 44 are formed to supply the cooling water to the cooling water supply pipe 41 and the cooling water discharge pipe 42, respectively. The couplers 43 and 44 are connected to the cooling water supply although not shown in the drawing.

In addition, the indexing means 50 rotates the first core in the lower mold 10 by 180 degrees like the first injection product 110 after injection of one material as the first injection molding product (having two molding spaces). In this case, it has a configuration in which injection is possible by using a second resin differently by placing in the second molding space. The indexing means 50 is provided in the grooves 51a and 51b and the lower mold 10, which are installed at a predetermined angle on the outer circumferential surface of the first member 32a of the index shaft 30, and is provided with a spring (not shown). It can be provided with a stopper 51c elastically biased to the groove side by the.

Referring to the action of the multi-injection mold according to the present invention configured as described above and the action of the index axis through it in more detail as follows.

In order to mold a product using the multi-injection mold according to the present invention, first, the lower mold 10, which is a fixed side mold, and the upper mold 30, which is a movable side mold, are mounted on an injection machine. At this time, the connecting member 32c connected to the index shaft 30 installed on the lower mold 10 is connected to a cylinder installed in the injection molding machine and a motor for forward and reverse rotation. The cooling water supply pipe part 41 and the cooling water supply device formed at the lower portion of the index shaft 30 are connected to each other through a coupling hole 43, and the cooling water discharge pipe part 42 and the cooling water discharge pipe are connected to each other through the coupling hole 44. Be connected

 In this state, the index shaft 30 is lowered by the cylinder so that the first and second cores 12 and 13 supported by the support member 11 are located in the first and second molding spaces 111 and 112. In addition, the upper mold, which is the movable side mold, descends to partition the first and second molding spaces 111 and 112.

Then, the resin is injected into the first molding space 111, which is the molding space, through the sprue bush and the runner using a nozzle.

As described above, the injection of the resin into the first molding space 111 is completed, and the cooling water is supplied to the cooling water line 12a of the first core through the cooling water supply pipe part 41 installed on the index shaft 30 through the cooling water supply device. Is supplied to cool the first core 12 and the molded product, and is discharged through the cooling water discharge pipe part 42 and the discharge pipe. Therefore, since the core can be cooled, the molding time of the product can be shortened.

The upper mold 30 is opened and the index shaft 30 is raised to separate the first and second cores 12 and 13 supported by the support member 11 from the lower mold.

The elevated index shaft 30 is rotated in a state where the first injection product is supported by the first core 12 and then lowered and positioned at the side of the second molding space 112. 1 is located in the molding space (111).

 In this state, the lower mold 10 and the upper mold 14 are combined, and the first resin is injected into the first molding space through the nozzles to mold the first injection product, and the second resin is the second molding space. To the second injection molded product for the first injection molded product to complete the molding of the product.

When the supply of the resin for molding the second injection product is completed as described above, the coolant is injected through the coolant supply pipe part 41 of the coolant supply and discharge means 40 installed on the index shaft 30 as described above. Then, the first and second cores are cooled and then discharged through the coolant discharge pipe part 42. Therefore, since the cooling water is injected at the time when the injection of the resin is completed, the cooling efficiency of the first and second cores can be improved, and the molding time of the product can be shortened. In particular, since the first and second cores 12 and 13 partitioning the molding space can be cooled, the incidence of defective products due to deformation and distortion of the molded product can be reduced.

As described above, the index axis and the multi-injection mold using the same according to the present invention can cool the first and core partitioning the molding space, thereby improving reliability according to the molding of the product.

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.

The present invention can be widely applied to various molds for injection molding injection molded products made of a release material.

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

2 is a perspective view showing an extract of an index axis provided with the first and second cores of a multi-injection mold according to the present invention;

3 is a sectional view of an index axis according to the present invention;

4 is a sectional view of an index axis according to the present invention;

Claims (3)

It is installed on at least one side of the upper and lower molds to be combined with each other to form a molding space, and is supported by a core which partitions the molding space, and is connected by a core and a connector and driven by an actuator installed in an injection molding machine. With the shaft body becoming And a cooling water supplying and discharging means for supplying and discharging cooling water to the water jacket formed in the core in the longitudinal direction on the shaft body. An injection molding of a product in which resins that are not fused with each other are combined, and a lower mold having first and second molding spaces formed to mold different release materials; An upper mold that opens and closes the first and second molding spaces by being combined with the lower mold and separated from the mold; An index shaft rotatably installed in the lower mold, first and second cores installed in the index shaft and selectively positioned in the first and second molding spaces, and an actuator coupled to the index shaft and installed in the injection molding machine. An indexing means having a connecting portion which is lifted and rotated, The index shaft includes a shaft body connected to the first and second cores, and a cooling water supply and discharge means formed in the lengthwise direction of the body to supply and discharge the cooling water to the water jacket formed on the first and second cores. Multi injection mold, characterized in that. The method of claim 2, The cooling water supply and discharge means includes a cooling water supply pipe portion formed in the longitudinal direction in the shaft body, and the cooling water discharge pipe portion formed in the longitudinal direction in the shaft body, wherein the cooling water supply pipe portion and the cooling water discharge pipe portion are centered in the longitudinal direction of the shaft body. Multi-injection mold, characterized in that arranged in the circumferentially uniform interval with respect to the engaging holes formed in the end of the shaft body, respectively.

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