KR20220021649A - Double injection mold and method for vehicle interior materials - Google Patents

Abstract

The present invention relates to a double injection molding mold and molding method for vehicle interior materials. The double injection molding mold for vehicle interior materials comprises: an upper mold moving up and down and having a first upper mold and a second upper mold; a lower mold combined or opened with the upper mold; a rotating core stored in a storage groove of the lower mold to move up and down, having a first lower mold and a second lower mold to form a first cavity and a second cavity with the upper mold and the lower mold, and rotates about a rotation shaft formed long in the vertical direction to change the positions of the first lower mold and the second lower mold; and a plurality of push pins having one end installed on an ejection plate that moves up and down and inserted into the lower mold to expose the other end toward the second cavity. Undercut molding is possible at the same time as double injection molding, so various vehicle interior materials with undercut can be molded. In addition, the structure is simple, and equipment investment costs can be reduced.

Description

DOUBLE INJECTION MOLD AND METHOD FOR VEHICLE INTERIOR MATERIALS}

The present invention relates to a double injection molding mold and a molding method for a vehicle interior material, and in particular, as ejection is possible simultaneously with double injection molding, a vehicle interior material having a complex structure requiring ejection can be molded, the structure is simple, and the equipment investment cost It relates to a double injection molding mold and a molding method for vehicle interior materials that can reduce

In general, in the interior of a car, the crash pad located in front of the driver's seat and the passenger seat, and the interior materials such as the instrument panel surrounding panel, center fascia panel, head lining, door trim, garnish, etc. installed.

Two methods have been mainly used for the realization of different colors.

Taking a door trim provided with a speaker grill as an example, as shown in FIG. 1 , one method is to injection mold the speaker grill 10a and the door trim 20a having different colors, respectively, and then the speaker grill 10a. There is a method to complete by assembling the to the door trim 20a, and another method is to first injection mold the speaker grill 10b in the primary mold set 40b as shown in FIG. By turning the turntable, the primary mold set (40b) and the secondary mold set (40a) set are rotated at once based on the center of the primary mold set (40b) and the secondary mold set (40a), that is, the actuator 30, There is a method of secondary injection molding of the door trim 20b to be integrated with the speaker grill 20a in the secondary mold set 40a.

As an example of the method described later among the two methods, a vehicle interior material and a manufacturing method thereof disclosed in Korean Patent Application Laid-Open No. 10-2011-0063205 (Patent Document 1), and Korean Patent Application Laid-Open No. 10-2006-0032352 (Patent Document 1) There is a method for manufacturing heterogeneous molded products using the dual molding device listed in 2).

In Patent Document 1, after the center fascia is molded with a resin solution on the side of the core molded in a single lower mold, the core is moved in the transverse direction so that the core is molded in the single lower mold, then rotated and then moved laterally again to mold the single upper mold side. do. Thereafter, a heterogeneous molded article is manufactured by forming a coating layer on the outside of the center fascia formed on the core.

On the other hand, in Patent Document 2, after injection molding a primary molded product in injection molding machine No. 1 in a state where two molds are attached to one mold plate, the mold plate is rotated 180 degrees, and thereafter, the first mold is used in injection device No. 2 A heterogeneous molded product is manufactured by injection molding silicone into a molded product.

However, in the case of the above-mentioned prior art and patent documents, since two sets of molds of the same shape must be used, product cost is increased and investment cost is increased. In particular, there was a problem in that the larger the product, the higher the investment cost.

In particular, investment cost and product cost were increased, and as two sets of molds were rotated at once with a turntable, the weight became heavy and the durability of the molding mold was deteriorated.

In addition, since most interior materials for vehicles are provided in complex shapes that require ejection, in order to be applied to the mass production of various interior materials for vehicles, ejection is possible during double injection for the realization of a different color, and a molding mold and molding that can mold the undercut together method is required.

Korean Patent Publication No. 10-2011-0063205 (2011.06.10) Korean Patent Publication No. 10-2006-0032352 (2006.04.17)

The present invention has been devised in the above-mentioned background, and it is possible to eject during double injection for the realization of a different color, and it is possible to mold the undercut together, so that various vehicle interior materials having an undercut can be molded, and the ejection of the vehicle interior material having a complex structure As this is possible, an object of the present invention is to provide a double injection molding mold and a molding method for a vehicle interior material having a wide range of use.

In addition, an object of the present invention is to provide a double injection molding mold for a vehicle interior material and a molding method, which can improve durability of a molding device, have a simple structure, and reduce equipment investment cost because only a rotating core is rotated.

In addition, an object of the present invention is to provide a double injection molding mold for vehicle interior materials and a molding method that can reduce investment cost by applying a general injection molding machine, which is an existing equipment.

The object of the present invention is not limited thereto, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

According to the present invention, an upper mold having a first upper mold and a second upper mold, a lower mold that is closed or mold-opened with an upper mold, and a lower mold are accommodated in the receiving groove of the lower mold for lifting and lowering operation, and having a first lower mold and a second lower mold A rotating core provided to form an upper mold and a lower mold, and a first cavity and a second cavity, and to change the positions of the first lower mold and the second lower mold by rotating about a rotating shaft formed long in the vertical direction, one end of which is lifted and lowered A double injection molding mold for a vehicle interior material including a plurality of push pins installed on the eject plate and inserted into the lower mold and having the other end exposed toward the second cavity may be provided.

In addition, it may further include an inclined core having an undercut core inserted into the lower mold and protruding upward to form an undercut of the vehicle interior material.

The lower mold is formed to protrude from two places of the receiving groove, is inserted into an insertion hole formed in the rotating core, and may include protrusions facing the first upper mold and the second upper mold, respectively.

In particular, the protrusion facing the second upper die may include an undercut forming portion which is recessed from the upper surface and provided with an undercut core to form an undercut cavity.

In addition, the undercut core may take out the finished vehicle interior material from the lower mold and the rotating core according to the lifting operation of the eject plate when the vehicle interior material is completed.

In addition, the outer surface of the rotating core may be formed as an inclined surface that protrudes outward toward the upper side, and the inner surface of the receiving groove may be formed as an inclined surface corresponding thereto.

In addition, according to the present invention, the step of receiving the rotating core having the first lower mold and the second lower mold in the receiving groove of the lower mold, the upper mold having the first upper mold and the second upper mold is mold-closed with the lower mold in which a plurality of push pins are installed A first cavity is formed between the protrusions of the first upper mold, the first lower mold, and the lower mold, and a second cavity is formed between the second upper mold, the second lower mold, and the lower mold. A primary resin is injected into the first cavity The first injection-molded product is molded, the upper mold is molded with the lower mold, and the rotating core to which the primary injection-molded product is attached is separated from the receiving groove and rotated 180° about the rotation axis, and the lower part where the undercut core is installed Forming an undercut cavity between the undercut forming part of the mold and the primary injection molded product, the upper mold is re-mold closed with the lower mold, and the primary injection molded product is placed in the second cavity, secondary to the undercut cavity and the second cavity A double injection molding method for a vehicle interior material can be provided, including a step in which a resin is injected to form a secondary injection molded product integrated with the primary injection molding product and an undercut, and the vehicle interior material is completed.

In addition, in the double injection molding method for vehicle interior materials, the upper mold is molded with the lower mold, the eject plate is moved upward, and the undercut core to which the finished vehicle interior material is attached is moved upward, and the completed vehicle interior material is taken out. may include

And, in the step of completing the vehicle interior material, the primary resin may be injected into the first cavity when the secondary injection-molded product is molded, so that a new primary injection-molded product may be molded.

According to the present invention as described above, ejection is possible during double injection for realization of a different color, and the undercut can be molded together, so that various vehicle interior materials with undercut can be molded. It has a wide range of use.

In addition, since only the rotating core is rotated during double injection molding, the durability of the molding apparatus is improved, the structure is simple, and the equipment investment cost is reduced.

That is, as a plurality of push pins for ejecting the finished vehicle interior material from the mold, an inclined core and an undercut core for forming the undercut are installed in the lower mold rather than the rotating core, the primary injection molded product is placed in the second cavity. When disposing, only the rotating core rotates, so the weight is reduced and the durability of the molding device is improved.

In addition, the eject plate on which the push pin and the inclined core are installed is not disposed inside the rotating core, but is disposed below the lower mold, and as it lifts and lowers, the thickness of the rotating core becomes thinner and the structure is simplified.

In addition, there is an effect of reducing the investment cost because a general injection molding machine, which is the existing equipment, can be applied.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the molding example of a prior art.
2 is a view showing another conventional molding example.
3 is a configuration diagram of a double injection molding die for vehicle interior materials according to an embodiment of the present invention.
4 is a perspective view exemplarily showing a rotating core and a lower mold of a double injection molding mold for a vehicle interior material according to an embodiment of the present invention.
5A to 5F are flowcharts of a vehicle interior molding method according to an embodiment of the present invention.
6 is a flow chart according to the double injection molding method for a vehicle interior material according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

3 is a configuration diagram of a double injection molding mold for vehicle interior material according to an embodiment of the present invention, and FIG. 4 is an exemplary view showing a rotating core and a lower mold of the double injection molding mold for vehicle interior material according to an embodiment of the present invention It is a perspective view, and FIGS. 5A to 5F are flowcharts of a vehicle interior molding method according to an embodiment of the present invention, and FIG. 6 is a flowchart according to the double injection molding method for a vehicle interior material according to an embodiment of the present invention.

As shown in these drawings, the double injection molding mold for vehicle interior material according to an embodiment of the present invention operates to lift and has an upper mold 100 and an upper mold 100 having a first upper mold 110 and a second upper mold 120 . ) and the lower mold 200 to be closed and mold-opened, the upper mold 100 is accommodated in the receiving groove 210 of the lower mold 200 and moves up and down, and includes a first lower mold 310 and a second lower mold 320. And the lower mold 200, the first cavity (C1), and the second cavity (C2) are formed, and rotated about the rotation shaft 330 elongated in the vertical direction to form the first lower mold 310 and the second lower mold 320 ) provided to change the position of the rotating core 300, one end of which is installed on the eject plate 400 for lifting and lowering and is inserted into the lower mold 200 so that the other end is exposed toward the second cavity (C2). It includes a plurality of push pins 420 .

The double injection molding mold for vehicle interior material according to the present invention is an injection mold for injecting the vehicle interior material 10 having an undercut 13 and easy ejection of the vehicle interior material 10 having a complex structure, and is an upper mold 100, It includes a lower mold 200 , a rotating core 300 , an inclined core 410 , and a push pin 420 .

The upper mold 100 has a first upper mold 110 and a second upper mold 120, is lifted and operated, and the lower mold 200 and the lower mold 200 are mold-closed or mold-opened to inject the resin into a first cavity (C1) and a second cavity ( C2) is formed.

The lower mold 200 is mold-closed or mold-opened with the upper mold 100 , and may be fixed to a molding device, for example.

The lower mold 200 is provided with a receiving groove 210 in which the rotating core 300 is accommodated, and the rotating shaft 330 of the rotating core 300, the inclined core 410, and a plurality of push pins 420 pass therethrough. is installed

The rotating core 300 is accommodated in the receiving groove 210 to be lifted and operated, and has a first lower mold 310 and a second lower mold 320 , so that when the upper mold 100 is molded into the lower mold 200 , the first A first cavity C1 is formed between the lower mold 310 , the first upper mold 110 , and the lower mold 200 , and the second lower mold 320 , the second upper mold 120 , and the lower mold 200 . A second cavity C2 is formed therebetween.

The rotating core 300 is provided with a rotating shaft 330 connected to an actuator (not shown) to rotate 180 degrees around the rotating shaft 330 to change the positions of the first lower mold 310 and the second lower mold 320 . The primary injection-molded product 11 molded in the first cavity C1 is disposed in the second cavity C2.

The rotating shaft 330 is formed to protrude vertically from the lower surface of the rotating core 300 , passes through the lower mold 200 , is connected to the actuator, and is installed to be movable in the vertical direction.

In addition, the rotation core 300 is formed as an inclined surface whose outer surface 301 gradually protrudes outward toward the upper side, and the inner surface 211 of the receiving groove 210 is formed as a corresponding inclined surface.

Accordingly, the rotating core 300 and the receiving groove 210 are guided to the respective inclined surfaces so that the rotating core 300 is easily inserted into the receiving groove 210 without interference, and between the rotating core 300 and the receiving groove 210 . It is possible to easily manage the fit tolerance of the rotation core 300 and the lower mold 200 to reduce the gap.

The inclined core 410 is inserted into the sliding hole 230 formed inside the lower mold 200 to be slidably installed, and an undercut core 411 is provided at an end protruding upward to undercut the vehicle interior material 10 . (13) is molded.

The inclined core 410 is installed on the ejection plate 400 installed to lift and lower from the lower side of the lower mold 200 , and is vertically inclined so that the ejection plate 400 slides in the sliding hole 230 during the lifting operation. and provides an ejecting function for taking out the completed vehicle interior material 10 .

The push pin 420 is attached to the lower side of the finished vehicle interior material 10 to provide an ejecting function for taking out the finished vehicle interior material 10 from the mold, and one end is installed on the eject plate 400 that lifts and lowers. It is inserted into the inner side of the lower mold 200 and the other end is exposed toward the second cavity C2.

A plurality of such push pins 420 are installed on the eject plate 400 , and a push pin 420 having the other end exposed toward the undercut cavity C3 may be additionally provided.

The push pin 420 passes through the lower mold 200 so that the other end is attached to the lower surface of the vehicle interior material 10, which is completed by injecting resin into the second cavity C2 and the undercut cavity C3. The second cavity C2 and the undercut cavity C3 are exposed.

In addition, a plurality of push pins 420 are provided to prevent damage to the vehicle interior material 10 when the completed vehicle interior material 10 is spaced apart from the mold, and are uniformly disposed.

That is, for example, any one of the plurality of push pins 420 is inserted into the lower mold 200 on the side of the rotation shaft 330 of the sliding hole 230 to support the primary injection-molded product 11 , and the plurality of push pins 420 . ), any one or a plurality of is inserted into the lower mold 200 on the opposite side of the rotating shaft 330 side of the sliding hole 230 to support the secondary injection molded product (12).

In addition, the inclined core 410 together with the plurality of push pins 420 supports the vehicle interior material 10 and supports the undercut 13 .

The plurality of push pins 420 and the inclined core 410 are simultaneously lifted and lowered when the ejection plate 400 is lifted.

In addition, the lower mold 200 is formed to protrude from two places of the receiving groove 210 and is inserted into the insertion hole 340 formed in the rotating core 300 , and the upper surface of the upper mold 100 is the first upper mold 110 of the upper mold 100 . ), and a protrusion 220 exposed to face the second upper mold 120, respectively.

At this time, the protrusion 220 is formed to protrude from two places of the receiving groove 210 , and the insertion hole 340 is also formed to protrude from two places of the rotating core 300 , but the protrusion 220 and the insertion hole 340 are It is formed in a shape corresponding to each other and the protrusion 220 is inserted into the insertion hole 340 .

In addition, when the rotating core 300 is rotated by 180 degrees about the rotating shaft 330 and then accommodated in the receiving groove 210 , the protrusions 220 are each formed to be inserted into the insertion hole 340 .

In addition, the protrusion 220 is formed as an inclined surface whose outer surface gradually protrudes outward toward the lower side, and the inner surface of the insertion hole 340 is formed as a corresponding inclined surface.

Accordingly, the protrusion 220 and the insertion hole 340 are guided to the respective inclined surfaces so that the protrusion 220 is easily inserted into the insertion hole 340 without interference, and the fitting between the protrusion 220 and the insertion hole 340 is fitted. Tolerance can be easily managed, thereby reducing the gap between the protrusion 220 and the insertion hole 340 .

Among the protrusions 220 , the protrusion 220 facing the second upper die 120 is provided with an undercut forming portion 221 recessed from the upper surface.

In addition, the undercut forming part 221 is not provided in the protrusion 220 facing the first upper die 110 among the protrusions 220 , and the inclined core 410 and the undercut core 411 are not installed. (110), to form a first cavity (C1) together with the rotating core (300), the primary injection molded product (11) is processed.

Then, the undercut core 411 is installed to protrude inward of the undercut forming part 221 , and the undercut core 411 is installed to be spaced apart from the bottom surface of the undercut forming part 221 to form an undercut cavity C3, and the undercut Resin is injected into the cavity C3 to form the undercut 13 in the vehicle interior material 10 .

The undercut core 411 may be bent at the end of the inclined core 410 to face the bottom surface of the undercut molding part 221 with a space therebetween, and a resin is injected between the bottom surface of the undercut molding part 221 and the vehicle. An undercut 13 is formed on the interior material 10 .

In addition, the ejection plate 400 may be provided with a plurality of nozzles for injecting the secondary resin into the second cavity (C2) and disposed through the lower mold 200, the secondary resin in the undercut cavity (C3) A separate nozzle for injection may be further provided and disposed through the lower mold 200 . In this case, when a nozzle for injecting the resin into the undercut cavity C3 is separately provided, the primary resin or the secondary resin may be selectively injected.

As such, the rotating core 300 has the insertion hole 340 formed at the position where the undercut 13 is to be formed in the vehicle interior 10 , and thus the protrusion 220 provided with the undercut forming part 221 of the lower mold 200 . ) may be exposed through the insertion hole 340 , and the undercut core 411 is installed in the lower mold 200 so that the undercut 13 is injection molded into the vehicle interior material 10 .

In addition, as the undercut core 411 is installed in the lower mold 200 to form the undercut 13 in the vehicle interior material 10 , the rotating core 300 separately from the undercut core 411 and the plurality of push pins 420 . ) can be lifted and lowered, so the durability of the molding device is improved.

That is, when the inclined core 410 is installed in the rotating core 300 because the insertion hole 340 is not formed in the rotating core 300 , the nozzle and the push pin are also installed in the rotating core 300 , so that the rotating core 300 is installed in the rotating core 300 . ) is complicated and the weight is increased to reduce the durability of the molding device, so that the rotation core 300 has the insertion hole 340 formed at the position where the undercut 13 is to be molded in the vehicle interior material 10 . desirable.

In addition, the inclined core 410 and the push pin 420 are installed on the eject plate 400 to lift and lower separately from the operation of the rotating core 300 , and when the vehicle interior material 10 is completed, the eject plate 400 moves upward. As the undercut core 411 moves upward, the finished vehicle interior material 10 is separated from the lower mold 200 and the rotating core 300 to be taken out.

In addition, as the ejection plate 400 is installed on the lower side of the lower mold 200 , the thickness of the rotating core 300 is reduced.

That is, when the ejection plate 400 is installed inside the rotating core 300 , it is necessary to provide a space in the rotating core 300 for the ejection plate 400 to move up and down, so the thickness of the rotating core 300 . is inevitably thickened, and as the ejection plate 400, the inclined core 410, and the push pin 420 are installed inside the rotating core 300, the weight increases and the durability of the molding device decreases, so the ejection plate 400 is preferably installed on the lower side of the lower mold 200 .

Hereinafter, a double injection molding method for a vehicle interior material as shown in FIGS. 5A to 5F and FIG. 6 will be described.

In the double injection molding method for vehicle interior materials according to an embodiment of the present invention, the rotating core 300 having a first lower mold 310 and a second lower mold 320 is a lower mold 200 in which a plurality of push pins 420 are installed. The step of being accommodated in the receiving groove 210, the upper mold 100 having the first upper mold 110 and the second upper mold 120 is mold-closed with the lower mold 200, the first upper mold 110, the first lower mold ( 310 ), a first cavity C1 is formed between the protrusions 220 of the lower mold 200 , and a second cavity C2 is formed between the second upper mold 120 , the second lower mold 320 , and the lower mold 200 . ) is formed, the primary resin is injected into the first cavity C1 to form the primary injection-molded product 11, the upper mold 100 is molded with the lower mold 200, the first injection The rotating core 300 to which the molded product 11 is attached is separated from the receiving groove 210 and rotated 180° around the rotating shaft 330, and then received and undercut molding of the lower mold 200 in which the undercut core 411 is installed. The step of forming the undercut cavity C3 between the part 221 and the first injection-molded product 11, the upper mold 100 is re-mold closed with the lower mold 200, and the primary injection-molded product 11 is the second cavity In the step of (C2), the secondary resin is injected into the undercut cavity (C3) and the second cavity (C2), and the secondary injection molded product 12 and the undercut 13 are integrated with the primary injection molded product 11 It is molded and includes the step of completing the vehicle interior material (10).

In the double injection molding method for vehicle interior materials of the present invention, the upper mold 100 , the lower mold 200 , the rotating core 300 , and the inclined core 410 are first prepared.

The upper mold 100 has a first upper mold 110 and a second upper mold 120 on a lower side facing the lower mold 200, and moves up and down in the vertical direction.

The lower mold 200 is mold-closed or mold-opened with the upper mold 100 , and forms a first cavity C1 and a second cavity C2 together with the rotating core 300 , and a receiving groove in which the rotating core 300 is accommodated. 210 is formed, and the protrusion 220 inserted into the insertion hole 340 of the rotating core 300 is formed.

In addition, the protrusion 220 at a position facing the second upper die 120 includes an undercut forming portion 221 in which the undercut core 411 is installed.

The rotating core 300 has a first lower mold 310 and a second lower mold 320 on the upper side facing the upper mold 100, and is elevating and elongated in the vertical direction, and the rotating shaft rotates according to the driving of the actuator. (330).

One side of the inclined core 410 is installed on the ejection plate 400, and it lifts and lowers together with the ejection plate 400, is slidably inserted into the sliding hole 230 formed in the lower mold 200, and the ejection plate 400 is In the downwardly moving state, the undercut core 411 formed at the other end is installed inside the undercut forming part 221 .

The eject plate 400 is installed to lift and lower from the lower side of the lower mold 200 , and a plurality of push pins 420 for ejecting the completed vehicle interior material 10 from the mold are installed to penetrate the lower mold 200 . do. At this time, the plurality of push pins 420 also slide inside the lower mold 200 when the ejection plate 400 is lifted and operate together.

And, although not shown in the drawing, one or more nozzles for injecting resin into the first cavity (C1), the second cavity (C2), and the undercut cavity (C3) through the lower mold 200 in the ejection plate 400 are provided. Alternatively, a support plate is installed on the lower side of the eject plate 400 and penetrates the eject plate 400 and the lower mold 200 on the support plate to penetrate the first cavity (C1), the second cavity (C2), undercut One or more nozzles for injecting resin into the cavity C3 may be installed.

First, in step S10, the eject plate 400 is moved downward and the upper mold 100 is moved upward so that the upper mold 100 and the lower mold 200 are mold-opened, and the rotating core 300 is moved to the lower mold. It is accommodated in the receiving groove 210 of the 200 . Then, the protrusion 220 is inserted into the insertion hole 340 .

Next, the upper mold 100 is moved to the lower side in step S20 to be mold-closed with the lower mold 200 .

When the upper mold 100 is molded with the lower mold 200, the first cavity C1 is formed between the first upper mold 110, the first lower mold 310, and the protrusions 220 of the lower mold 200, and the first cavity C1 is formed. A second cavity C2 is formed between the two upper molds 120 , the second lower mold 320 , and the lower mold 200 .

Next, as shown in FIG. 5A in step S30, the primary resin is injected into the first cavity C1 through the nozzle to form the primary injection-molded article 11.

The primary resin injected into the first cavity C1 is cured to become a primary injection molded product 11, and the primary injection molded product 11 is a rotating core ( 300) is maintained.

Next, in step S40, the upper mold 100 is moved upward to be mold-opened with the lower mold 200.

Next, in step S50, the rotating core 300 is separated from the lower mold 200 and rotated about the rotating shaft 330 according to the driving of the actuator, and then accommodated in the lower mold 200.

At this time, the opening of the upper mold 100 with the lower mold 200 and the separation of the rotating core 300 from the lower mold 200 may occur simultaneously.

The rotating core 300 is moved upward with the primary injection-molded product 11 attached thereto as shown in FIG. 5B to space the primary injection-molded product 11 from the lower mold 200 .

And as shown in FIG. 5c, the rotating core 300 rotates 180° around the rotating shaft 330 according to the driving of the actuator, so that the first lower mold 310 and the second lower mold 320 of the rotating core 300 are rotated. The position of is changed, and the primary injection-molded product 11 is disposed between the first upper mold 110 and the first lower mold 310 with the changed position.

In addition, the rotating core 300 is moved downward to be accommodated in the receiving groove 210 and covers the undercut forming part 221 of the lower mold 200 in which the undercut core 411 is installed to form the undercut cavity C3.

That is, the undercut cavity C3 is formed between the undercut molding part 221 of the lower mold 200 in which the undercut core 411 is installed and the primary injection-molded product 11 .

Next, in step S60, as shown in FIG. 5D, the upper mold 100 is moved downward and re-mold closed with the lower mold 200, and the primary injection-molded product 11 is disposed in the second cavity C2.

Next, as shown in Fig. 5e in step S70, the secondary resin is injected into the undercut cavity (C3) and the second cavity (C2) through the nozzle to be integrated with the primary injection molded product 11 ( 12) and the undercut 13 are molded, and the vehicle interior material 10 is completed.

However, the primary resin may be injected into the undercut cavity C3.

The resin injected into the undercut cavity (C3) and the second cavity (C2) is cured to become a secondary injection-molded product (12), and the secondary injection-molded product (12) and undercut (13) integrated with the primary injection-molded product (11) ), that is, the completed vehicle interior material 10 has an undercut core 411, a plurality of push pins 420, a rotating core 300, and a lower mold 200 even when the upper mold 100 is molded in the lower mold 200. remains attached to the

And if you want to continuously produce a plurality of vehicle interior materials 10, when molding the secondary injection molded product 12 and the undercut 13 in step S70 to produce the next vehicle interior material 10, the first cavity (C1) The primary resin is injected into the , and a new primary injection molded article 11 is molded by curing.

Next, as shown in FIG. 5f in step S80, the upper mold 100 is molded with the lower mold 200, the eject plate 400 is moved upward, and the completed vehicle interior material 10 is attached to the inclined slope. The core 410 is moved upward.

At this time, when the eject plate 400 moves upward and the undercut core 411 together with the plurality of push pins 420 and the inclined core 410 moves upward, it is attached to the undercut core 411 and the plurality of push pins 420 . The completed vehicle interior material 10 moves upward and is spaced apart from the lower mold 200 and the rotating core 300 .

Accordingly, the finished vehicle interior material 10 can be taken out from the undercut core 411, and the undercut core 411 separates the completed vehicle interior material 10 from the lower mold 200 and the rotating core 300. It provides the function to extract.

Thereafter, in the case of continuously producing a plurality of vehicle interior materials 10 , after taking out the finished vehicle interior material 10 from the undercut core 411 , the eject plate 400 is moved downward and the undercut core 411 is undercutted. It is located on the inside of the molding part (221).

Then, by repeating steps S50 to S80, and repeating the above-described operations, a plurality of vehicle interior materials 10 may be continuously produced.

According to the embodiments of the present invention having such a shape and structure, ejection is possible during double injection for this unique implementation, and the undercut can be molded together, so that various vehicle interior materials having an undercut can be molded, and a vehicle having a complex structure. As the interior material can be ejected, the range of use is wide.

In addition, since only the rotating core is rotated during double injection molding, the durability of the molding apparatus is improved, the structure is simple, and the equipment investment cost is reduced.

That is, as the plurality of push pins for ejecting the finished vehicle interior material from the mold, the inclined core and the undercut core for forming the undercut are installed in the lower mold rather than the rotating core, the primary injection molded product is placed in the second cavity. Since only the rotating core rotates when disposing, the weight is reduced and the durability of the molding device is improved.

In addition, the eject plate on which the inclined core and the push pin are installed is not disposed inside the rotating core, but is disposed below the lower mold, and as it lifts and lowers, the thickness of the rotating core becomes thinner and the structure is simplified.

In addition, there is an effect of reducing the investment cost because the conventional injection molding machine can be applied.

In the above, even though all the components constituting the embodiment of the present invention are described as being combined or operated in combination, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: Vehicle interior material 11: Primary injection molded product
12: secondary injection molded product 13: undercut
100: upper mold 110: first upper mold
120: second upper mold 200: lower mold
210: receiving groove 220: protrusion
221: undercut forming part 230: sliding hole
300: rotating core 310: first lower mold
320: second lower mold 330: rotation shaft
340: insertion hole 400: eject plate
410: inclined core 411: undercut core
420: push pin C1: first cavity
C2: second cavity C3: undercut cavity

Claims (9)

an upper mold having a first upper mold and a second upper mold for lifting and lowering;
a lower mold which is mold closed or mold-opened with the upper mold;
It is accommodated in the receiving groove of the lower mold and moves up and down, and includes a first lower mold and a second lower mold to form the upper mold and the lower mold, and the first cavity and the second cavity, and rotates around a rotating shaft formed long in the vertical direction a rotating core provided to change the positions of the first lower mold and the second lower mold; and
a plurality of push pins having one end installed on the ejection plate for lifting and lowering, the other end being inserted into the lower mold and exposing the other end toward the second cavity;
A double injection molding mold for vehicle interior materials comprising a.
The method of claim 1,
an inclined core having an undercut core inserted into the lower mold and protruding upward to form an undercut of a vehicle interior material;
A double injection molding mold for vehicle interior materials further comprising a.
3. The method of claim 2,
The lower mold is
a protrusion formed to protrude from two places of the receiving groove, inserted into an insertion hole formed in the rotating core, and facing the first upper mold and the second upper mold, respectively;
A double injection molding mold for vehicle interior materials, characterized in that it comprises a.
4. The method of claim 3,
The double injection molding mold for a vehicle interior material, characterized in that the protrusion portion facing the second upper die is recessed from an upper surface and includes an undercut molding portion in which the undercut core is installed to form an undercut cavity.
The method of claim 1,
The double injection molding mold for vehicle interior material, characterized in that when the vehicle interior material is completed, the push pin takes out the finished vehicle interior material from the lower mold and the rotating core according to the lifting operation of the ejection plate.
The method of claim 1,
The rotary core is formed as an inclined surface whose outer surface protrudes outward toward the upper side, and the inner surface of the receiving groove is formed as a corresponding inclined surface.
Receiving the rotating core having the first lower mold and the second lower mold in the receiving groove of the lower mold;
An upper mold having a first upper mold and a second upper mold is closed with the lower mold in which a plurality of push pins are installed to form a first cavity between the protrusions of the first upper mold, the first lower mold, and the lower mold, and the second upper mold and the second upper mold 2 forming a second cavity between the lower mold and the lower mold;
a step of injecting a primary resin into the first cavity to mold a primary injection-molded article;
forming the upper mold with the lower mold;
The rotational core to which the primary injection molded product is attached is separated from the receiving groove and rotated 180° about the rotation axis, and then is accommodated. being formed;
disposing the first injection-molded product in the second cavity by re-mold closing the upper mold with the lower mold;
a step of injecting a secondary resin into the undercut cavity and the second cavity to form a secondary injection-molded product integrated with the primary injection-molded product and the undercut, thereby completing a vehicle interior;
A double injection molding method for vehicle interior materials comprising a.
8. The method of claim 7,
The upper mold is mold-opened with the lower mold, the eject plate is moved upward, and the push pin to which the finished vehicle interior material is attached is moved upward to take out the completed vehicle interior material;
Double injection molding method for vehicle interior material further comprising.
8. The method of claim 7,
The step of completing the vehicle interior material,
When the secondary injection-molded product is molded, a primary resin is injected into the first cavity to form a new primary injection-molded product.

Images