KR102149026B1 - Double injection mold equipped with 2 sliding core - Google Patents

Abstract

The present invention discloses a double injection mold equipped with a two-stage sliding core capable of simultaneously molding upper and lower sides. Particularly, the double injection mold equipped with the two-stage sliding core capable of simultaneously molding the upper and lower sides includes: an upper core attached to an upper mold; a lower core attached to a lower mold; a lower cam core provided on one side of the lower core so as to be lifted and lowered, and combined with the upper core and the lower core to form a primary cavity; a primary sliding core device slidably installed on one side of the lower cam core, and configured to enter the primary cavity to inject a primary injection-molded object; a secondary sliding core device slidably installed on an upper side of the primary sliding core device, and configured to enter when the primary sliding core device moves rearward to form a secondary cavity which surrounds upper and lower sides of the primary injection-molded object; and a core driving device for driving the primary sliding core device and the secondary sliding core device such that the primary sliding core device and the secondary sliding core device slide in opposite directions, wherein a secondary injection-molded object is simultaneously injection-molded on the upper and lower sides of the first injection-molded object.

Description

Double injection mold equipped with 2 sliding core capable of simultaneous molding on the upper and lower sides {Double injection mold equipped with 2 sliding core}

The present invention relates to a double injection mold, and more particularly, to a double injection mold equipped with a two-stage sliding core capable of simultaneously molding a second injection product on the upper side and the lower side of the first injection product.

In general, in injection molding, when the mold is closed tightly, a cavity having a product shape is formed in the mold, and a resin melted at an appropriate temperature is injected and filled in the cavity at an appropriate pressure and speed, and after a certain period of time When the filled resin is cooled and solidified, the mold is separated from the mold and the molded product is taken out.At this time, a double injection molding mold is often used to injection mold a composite product consisting of parts of different resin types or different colors. I'm using it.

In such a double injection molding mold, the insert method in which the first injection molded in the first mold is put into the second mold and double injection, the rotary method in which the mold plate rotates with two molds to cross the moving mold, and two molds are used. Turntable method in which the table on the moving side of the injection machine rotates to cross the mold on the moving side, and index core method in which the lower core is protruded and rotated using a motor or hydraulic pressure with one mold, and two nozzles are on the front/rear/side surfaces. There is a core, and there is a spin-form method in which the core rotates in the center of the mold to mold the injection product.

However, since the part used as the mating surface where the molds are in contact with each other during injection molding of the primary product, and the molding surface on which the product is molded in the injection molding of the second product, the second product is injected only on the front or side of the primary product. Can be molded. In other words, it is impossible to injection mold the second product on the bottom of the first product.

In order to meet the needs of consumers who want various types of double injection molding products, there is a need for an injection molding mold capable of injection molding a second product on the bottom of the first product.

Korean Patent Registration 10-1522678 (2015.5.18.)"Double injection mold equipped with sliding core" Korean Patent Laid-Open Publication No. 10-2009-0030877 (2009.3.25.) "Method of manufacturing driver and handle by double injection molding"

Accordingly, the present invention is to solve the above-described problem, and an object of the present invention is to allow the primary sliding core means and the secondary sliding core means to be driven alternately with each other, so that the primary sliding core means ejects the primary injection and the secondary It is intended to provide a double injection mold equipped with a two-stage sliding core capable of simultaneous upper and lower molding that enables the sliding core means to inject the second injection to the upper and lower sides of the first injection.

A double injection mold equipped with a two-stage sliding core capable of simultaneous upper and lower molding according to the present invention for achieving the above object comprises: an upper core attached to the upper mold; A lower core attached to the lower mold; A lower cam core that is provided to be elevating on one side of the lower core and is combined with the upper core and the lower core to form a primary cavity; A primary sliding core means slidably installed on one side of the lower cam core and entering the primary cavity to inject a primary injection product; A secondary sliding core means that is slidably installed above the primary sliding core means, and enters when the primary sliding core means moves backward to form a secondary cavity surrounding the upper and lower sides of the primary injection product; And a core driving means for driving the primary sliding core means and the secondary sliding core means to slide in opposite directions to each other, so that the secondary injection products can be simultaneously injection-molded on the upper side and the lower side of the primary injection product. .

Here, the core driving means includes a primary core rack coupled to the primary sliding core means, a secondary core rack installed above the primary core rack and coupled to the secondary sliding core means, and the 1 It may include a drive pinion positioned between the primary core rack and the secondary core rack and coupled with a gear.

And the primary sliding core means, a primary core body coupled to the primary core rack and slidingly driven, and a rod-shaped, horizontally coupled to the primary core body, the end of which enters the primary cavity or It can be made by including a core pin that moves backward.

At this time, the end of the core pin has an outer diameter smaller than the outer diameter of the core pin and has a protruding shape to inject a hollow primary injection product, and a position where the protrusion and the core pin meet is formed A slit portion having a cut shape may be formed to eject the outer diameter.

In addition, a cam is coupled to the primary core body, the cam is coupled to the primary core rack, and a cam pin that can be inserted into an inclined cam hole of the lower cam core may be formed at an end of the cam to be inclined.

On the other hand, the secondary sliding core means is accommodated in the inside while the core pin penetrates, is coupled to the secondary core rack, and the end is spaced apart from the primary injection product to form a secondary cavity, the secondary core body, the While the core pin penetrates, it is accommodated therein, and is inserted between the secondary core body and the core pin, and an end portion may include an auxiliary core that seals the secondary cavity.

In addition, an inclined hole is formed in the auxiliary core, and the auxiliary core is slid while the inclined pin is inserted into the inclined hole to seal the secondary cavity.

According to the present invention described above, it is not possible to simultaneously inject the second injection product to the upper side and the lower side of the primary injection product during the conventional double injection, but according to the present invention, a two-stage sliding core structure consisting of primary and secondary sliding core means. By using, there is an effect that simultaneous molding of the upper and lower sides is possible.

1 is a cross-sectional view showing a double injection mold equipped with a sliding core capable of simultaneous upper and lower molding according to an embodiment of the present invention
2 is an AA cross-sectional view of the first injection mold part of the present invention shown in FIG. 1
FIG. 3 is a cross-sectional view taken along BB of the first injection mold part of the present invention shown in FIG. 1
4 is a CC cross-sectional view of the second injection mold part of the present invention shown in FIG. 1
5 is a DD cross-sectional view of the second injection mold part of the present invention shown in FIG. 1
6 is a perspective view showing the structure of the primary and secondary sliding core means of the present invention
7A to 7D are state diagrams showing the operation process of the present invention

Hereinafter, an embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

For reference, the description with reference to the drawings is for easier understanding of the present invention, and the scope of the present invention is not limited thereto. Further, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, a detailed description will be omitted.

1 is a cross-sectional view showing a double injection mold equipped with a sliding core capable of simultaneous upper and lower molding according to an embodiment of the present invention.

The present invention relates to a double injection mold, and is an invention characterized in that it has a structure in which a two-stage sliding core is mounted so that a second injection product can be simultaneously injected not only on the upper side of the primary injection product but also on the lower side during double injection.

The present invention has a structure in which the first injection mold part 100 and the second injection mold part 200 are arranged side by side as shown, and the first injection mold part 100 and the second injection mold part 200 are Have the same structure.

And since the whole can be rotated, the first injection is made in the first injection mold part 100, and at the same time, the second injection is made in the second injection mold part 200, and the first injection after the entire rotation is driven. The second injection is performed in the mold part 100, and the second injection mold part 200 is repeated in such a manner that the first injection is performed.

Therefore, hereinafter, it will be described in detail with reference to the first injection mold part 100.

The first injection mold part 100 of the present invention is largely, the upper core 110 and the lower core 120, the lower cam core 140, the primary sliding core means 150, the secondary sliding core means 160 It may be configured to include a core driving means 170.

First, the upper core 110 and the lower core 120 will be described.

The upper core 110 and the lower core 120 are configured to form a cavity which is an injection molding space by being molded with each other.

In this case, the upper core 110 may be attached to and coupled to an upper mold (not shown) and the lower core 120 to a lower mold (not shown), respectively.

Accordingly, the upper core 110 and the lower core 120 are operated to be opened or closed by the lifting of the upper mold.

Since the upper mold and the upper core 110, the lower mold and the lower core 120 are known technologies, detailed descriptions thereof will be omitted.

Next, the lower cam core will be described with reference to FIGS. 2 to 5 together.

2 is an AA cross-sectional view of the first injection mold portion of the present invention shown in FIG. 1, FIG. 3 is a BB cross-sectional view of the first injection mold portion of the present invention shown in FIG. 1, and FIG. 4 is the present invention shown in FIG. CC is a cross-sectional view of the secondary injection mold portion of the, Figure 5 is a DD cross-sectional view of the secondary injection mold portion of the present invention shown in FIG.

3 and 5, the lower cam core 140 is provided on one side of the lower core 120.

The upper end of the lower cam core 140 is merged with the upper core 110 and the lower core 120 to form a primary cavity C1 for ejecting the primary injection product P1.

In this case, it is preferable that the lower cam core 140 is installed to be elevating, and the elevating driving of the lower cam core 140 is operated to elevate in connection with the primary sliding core means 150 to be described later.

That is, the lower cam core 140 is driven to rise during the first injection and to descend during the second injection. To this end, a cam hole 141 which obliquely penetrates from one side of the lower cam core 140 to the other side is formed.

The lifting drive of the lower cam core 140 will be described in detail below.

Next, the primary sliding core means 150 will be described with reference to FIG. 6. 6 is a perspective view showing the structure of the primary and secondary sliding core means of the present invention.

3, 5, 6, the primary sliding core means 150 is a configuration for injecting the primary injection product (P1), is installed to be slidable on one side of the lower cam core (140) It has a structure that can enter the primary cavity C1 or move backward.

Specifically, the primary sliding core means 150 may be configured to include a primary core body 152 and a core pin 151.

The primary core body 152 is slidingly driven in conjunction with the core driving means 170 and is provided to be spaced apart from one side of the lower cam core 140.

At this time, the cam 153 may be coupled to the primary core body 152 so that the primary core body 152 and the lower cam core 140 are interlocked.

In addition, an inclined cam pin 153a may be formed at an end of the cam 153. The cam pin 153a may be inserted into or removed from the inclined cam hole 141 of the lower cam core 140 to drive the lower cam core 140 up and down.

In addition, the core driving means 170 may be interlocked with the primary core body 152, but the primary core body 152 is slidingly driven by sliding the cam 153 by interlocking with the cam 153 At the same time, the lower cam core 140 may be lifted and driven.

Meanwhile, a rod-shaped core pin 151 may be horizontally coupled to the primary core body 152.

One end of the core pin 151 is coupled to the primary core body 152, and the other end extends long in a state spaced apart from the upper side of the cam 153 to enter the interior of the primary cavity C1. I can.

Therefore, the primary core body 152, the cam 153, and the core pin 151 are integrally interlocked and can be slid by the core driving means 170, so that the end of the core pin 151 is the primary It may enter into the interior of the cavity C1 or may escape by moving backward.

Here, a protruding portion 151a having a protruding shape is formed at an end of the core pin 151. The protrusion 151a has an outer diameter smaller than the outer diameter of the core pin 151.

Therefore, the core pin 151 and the protrusion 151a have a straight end shape at a position where they meet, and a slit portion 151b is formed at the end position.

The slit portion 151b has a shape cut around the outer periphery of the protruding portion 151a.

The protrusion 151a is inserted into the primary cavity C1 so that the primary injection product P1 is formed into a hollow shape. At this time, the slit portion 151b also becomes the primary cavity C1 to inject all or part of the outer diameter of the primary injection product P1 into a hollow tube shape.

Next, the secondary sliding core means 160 will be described.

3, 5, 6, the secondary sliding core means 160 is a configuration for injecting the secondary injection product (P2), so as to be slid on the upper side of the primary sliding core means 150 It is installed and has a structure capable of entering or moving backward so as to surround the upper and lower sides of the primary injection product P1.

At this time, the secondary sliding core means 160 is also driven by the core driving means 170, and is driven to slide opposite to the primary sliding core means 150. That is, when the primary sliding core means 150 enters, the secondary sliding core means 160 moves backward, and when the primary sliding core means 150 moves backward, the secondary sliding core means 160 enters. Is driven to

Specifically, the secondary sliding core means 160 may be configured to include a secondary core body 161 and an auxiliary core 162.

The secondary core body 161 is for forming a secondary cavity C2 and the core pin 151 passes through the center thereof. That is, the secondary core body 161 accommodates the core pins 151, but may slide with each other.

The secondary core body 161 is slidingly driven in conjunction with the core driving means 170.

In addition, the end of the secondary core body 161 faces the primary injection product P1, and enters so as to be spaced apart from the outer circumference of the primary injection product P1 to form a secondary cavity C2. That is, the inner diameter of the end of the secondary core body 161 is larger than the outer diameter of the primary injection product P1.

Meanwhile, the auxiliary core 162 is inserted and accommodated in the secondary core body 161.

In this case, the core pin 151 passes through the center of the auxiliary core 162 and is accommodated therein.

That is, the core pin 151 passes through the secondary core body 161 and the secondary core 162 at the same time, and the secondary core 162 is between the core pin 151 and the secondary core body 161 Is inserted into

Here, at the end of the auxiliary core 162, a sealing portion 162a having an inner diameter smaller than the outer diameter of the primary injection product P1 is formed, and the sealing portion 162a is caught by the primary injection product P1 The secondary cavity C2 is sealed. Accordingly, the secondary cavity C2 may be completely sealed.

In addition, the auxiliary core 162 may be slidably driven by the core driving means 170, but it is preferable that the auxiliary core 162 may be operated as a separate driving means in order to provide a time difference from the operation point of the secondary core body 161.

To this end, the auxiliary core 162 is provided with an inclined hole 162a in the auxiliary core 162 and a driving body 164 having a separate inclined pin 164a formed on the upper side of the auxiliary core 162 Can be driven.

That is, when the driving body 164 descends and the inclined pin 164a is inserted into the inclined hole 162a, the auxiliary core 162 may be slid and moved to the side.

Next, the core driving means 170 will be described.

2 and 4, the core driving means 170 generates power to drive the primary sliding core means 150 and the secondary sliding core means 160 to slide in opposite directions. to provide.

The core driving means 170 is composed of a primary core rack 171, a secondary core rack 172, and a driving pinion 173.

The primary core rack 171 is coupled to the primary core body 152 or the cam 153 of the primary sliding core means 150, as shown, the secondary core rack 172 is the second It is coupled with the secondary core body 161 of the primary sliding core means 160.

In addition, the primary core rack 171 and the secondary core rack 172 are vertically spaced apart and arranged in parallel, and the driving pinions 173 are gear-coupled between them.

Accordingly, when the driving pinion 173 rotates in one direction, the primary core rack 171 and the secondary core rack 172 move in opposite directions, respectively.

Accordingly, the primary sliding core means 150 and the secondary sliding core means 160 may slide in opposite directions to each other.

Until now, the first injection mold unit 100 of the present invention has been described, but the second injection mold unit 200 has the same configuration as the first injection mold unit 100 as described above.

Therefore, it should be noted that each configuration of the secondary injection mold part 200 shown in the drawings is different from that of the primary injection mold part 100, but corresponds to the same name.

Hereinafter, an operation process of the present invention will be described with reference to FIG. 7. 7A to 7D are state diagrams showing the operation of the present invention.

7A is a process of forming the primary cavity C1.

First, when the upper mold and the lower mold are closed, the upper core 110 and the lower core 120 are combined. Further, the lower cam core 140 also rises to form a primary cavity C1 together with the upper core 110 and the lower core 120.

In this case, the upper core 110 may have a structure in which the upper cam core 130 is further included.

In addition, when the driving pinion 173 of the core driving means 170 rotates in one direction, the primary core rack 171 moves the primary sliding core means 150 in the direction of the primary cavity C1. On the other hand, the secondary sliding core means 160 is moved backward.

Accordingly, the end of the core pin 151 enters into the primary cavity C1. That is, the protrusion portion 151a is inserted, and the slit portion () forms the primary cavity C1 together.

7B is a first injection process.

When the primary cavity C1 is formed as described above, the primary material is injected through a separate injection port to form the primary injection product P1.

7C is a process of forming the secondary cavity C2.

When the primary injection is made, when the driving pinion 173 of the core driving unit 170 rotates in the opposite direction, the secondary core rack 172 moves the secondary sliding core unit 160 in the direction of the primary injection product (P1). Move to On the other hand, the secondary sliding core means 160 is moved backward.

At this time, as the secondary core body 161 enters, the secondary cavity C2 is formed by surrounding the outer periphery of the primary injection product P1 in a spaced state.

Then, the auxiliary core 162 moves with a time difference to seal the secondary cavity C2.

Accordingly, secondary cavities C2 are formed on the upper and lower sides of the primary injection product P1.

7D is a second injection process.

When the secondary cavity C2 is formed as described above, the secondary material is injected through a separate injection port, and the secondary injection product P2 is molded on the upper and lower sides of the primary injection product P1, thereby completing double injection.

Although the exemplary embodiments of the present invention have been described above with reference to the drawings, a person of ordinary skill in the field to which the present invention belongs will be able to perform various applications and modifications within the scope of the present invention based on the above contents. Therefore, the scope of the present invention is limited to the described embodiments and should not be determined, and should not be determined by the claims to be described later, but also by those equivalents to the claims.

100: 1st injection mold part
110: upper core 120: lower core
130: upper cam core 140: lower cam core
141: camhole
150: primary sliding core means 151: core pin
151a: protrusion 151b: slit
152: primary core body 153: cam
153a: Camp pin
160: secondary sliding core means 161: secondary core body
162: auxiliary core 162a: sealing portion
162b: inclined hole 164: driving body
164a: inclined pin
170: core driving means 171: primary core rack
172: secondary core rack 173: driving pinion
200: 2nd injection mold part
210: upper core 220: lower core
240: lower cam core 241: cam hole
250: primary sliding core means 251: core pin
251a: protrusion 251b: slit
252: primary core body 253: cam
253a: Camp pin
260: secondary sliding core means 261: secondary core body
262: secondary core
270: core driving means 271: primary core rack
272: secondary core rack 273: drive pinion
C1: primary cavity C2: secondary cavity
P1: 1st injection product P2: 2nd injection product

Claims (7)

An upper core attached to the upper mold;
A lower core attached to the lower mold;
A lower cam core that is provided to be elevating on one side of the lower core and is combined with the upper core and the lower core to form a primary cavity;
A primary sliding core means slidably installed on one side of the lower cam core and entering the primary cavity to inject a primary injection product;
A secondary sliding core means installed to be slidably above the primary sliding core means and entering when the primary sliding core means moves backward to form a secondary cavity surrounding the upper and lower sides of the primary injection product;
A primary core rack coupled to the primary sliding core means; a secondary core rack installed on an upper side of the primary core rack and coupled to the secondary sliding core means; and the primary core rack and the secondary core rack Consisting of including; a core drive means comprising a drive pinion positioned between the gear-coupled, the primary sliding core means and the secondary sliding core means is driven to slide in opposite directions to each other,
A double injection mold equipped with a two-stage sliding core capable of simultaneous upper and lower sides, characterized in that the second injection product can be simultaneously injection-molded on the upper side and the lower side of the first injection product. delete The method of claim 1,
The primary sliding core means,
Comprising a primary core body coupled to the primary core rack and slidingly driven, and a core pin formed in a rod shape and horizontally coupled to the primary core body, and an end portion entering or retreating into the primary cavity A double injection mold equipped with a two-stage sliding core capable of simultaneous upper and lower molding. The method of claim 3,
The end of the core pin has an outer diameter smaller than the outer diameter of the core pin and has a protruding shape that injects a hollow-shaped primary injection product, and a position where the protrusion meets the core pin is the outer diameter of the primary injection product A double injection mold equipped with a two-stage sliding core capable of simultaneous upper and lower molding, characterized in that a slit portion in a shape cut to be injected is formed. The method of claim 3,
A cam is coupled to the primary core body, the cam is coupled to the primary core rack, and a cam pin that can be inserted into the inclined cam hole of the lower cam core is formed at an end of the cam to be inclined. A double injection mold equipped with a two-stage sliding core capable of forming at the same time on the upper and lower sides. The method of claim 3,
The secondary sliding core means,
The core pin penetrates and is accommodated inside and is coupled to the secondary core rack, and an end portion is spaced apart from the primary injection product to form a secondary cavity, and the core pin is accommodated inside while passing through the core pin. A double injection mold equipped with a two-stage sliding core capable of simultaneous upper and lower molding, characterized in that it is inserted between the secondary core body and the core pin and includes an auxiliary core sealing the secondary cavity. The method of claim 6,
The secondary core has an inclined hole formed, and the secondary core is slid while the inclined pin is inserted into the inclined hole to seal the secondary cavity. Injection mold.

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