KR20090115105A - Injection molding die and injection molding method using bmc - Google Patents

Abstract

PURPOSE: An injection molding die and an injection molding method using a BMC(Bulk Molding Compound) is provided to eject easily a finished product and a sprue from a manifold by preventing the temperature of a mold from be dissipated to the outside or a sprue unit using a heat insulating panel unit and a cooling block. CONSTITUTION: An injection molding die(1000) comprises a sprue bush and a manifold(1300). The sprue bush is installed in the upper center. The manifold guides BMC material ejected through the sprue bush to a runner unit, and a gate unit or a sprue unit. The manifold supplies BMC material to upper and lower cavities(1121,1211). The manifold maintains keeps BMC material supplied to a cavity at the temperature of 50~60°C in not solid or melted state but fluid state.

Description

Injection molding mold using BMC and its method {INJECTION MOLDING DIE AND INJECTION MOLDING METHOD USING BMC}

The present invention relates to an injection molding mold using a BMC (Bulk Molding Compound) and a method thereof, and in particular, because it is manufactured by injection molding, the molding cycle is faster and productivity is improved, as well as the orientation of the fibers of the BMC (BMC). The present invention relates to an injection molding mold and a method using BMC (BMC), which can improve the strength and, of course, prevent the occurrence of unnecessary runners by seating a manifold on the injection molding mold.

In general, BMC (Bulk Molding Compound) is a thermosetting molding material using fiber (glass fiber) as a reinforcing agent in a matrix mixed uniformly with unsaturated polyester resins, hardeners, fillers and mold release agents. This material is excellent in electrical performance, heat resistance and water resistance.

The molding of the product using the BMC synthetic resin loads the lower mold of the lower mold of the compression mold with the heating heater and presses the upper mold of the upper mold with the heating heater to heat the molded product. Compression molding dominated.

However, this compression molding takes a lot of time due to the measurement of BMC (BMC), the productivity is lowered, and a high gloss product cannot be obtained, while the added glass fiber does not produce an orientation, there is a problem that the strength is lowered.

The present invention has been made to solve the conventional problems as described above, the material of the BMC (BMC) injected from the injection molding machine supplied to the upper cavity and the lower cavity through the sprue bush to accommodate the sprue bush. At the same time, it acts as a runner to the upper mold and at the same time, the material of the BMC supplied to the upper cavity and the lower cavity is maintained in a state where only the flow is not solid and not the state of melting cured. It is a first object to provide an injection molding mold using BMC, which makes it possible to prevent the manifold from making the runner unnecessary in the injection molding mold.

The present invention, the sealing O-ring is installed on any one side of the part of the upper mold and the lower mold to surround the at least one cavity consisting of the upper cavity and the lower cavity, and the gas vent formed in the cavity and connected to the gas vent formed The second purpose is to provide an injection molding mold using a BMC (BMC) that is capable of vacuum molding by a vacuum hole connected to the vacuum pump.

A third object of the present invention is to provide an injection molding mold using a BMC (BMC) which is formed at a predetermined interval around at least one of the upper cavity and the lower cavity so that an overflow receiving portion is formed to prevent unmolding. There is this.

The present invention provides an injection molding mold using BMC (BMC), which prevents the temperature of the mold from being transferred to the outside or transferred to the gate by the heat insulating plate and the cooling block so that the product and the gate are easily separated from the manifold. There is a fourth purpose.

The present invention is to pressurize the upper mold and the lower mold of the mold in which the cavity of the product is formed, to heat the mold, the vacuum pump is operated by a vacuum line to vacuum, the BMC resin (BMC) sprue bush installed in the upper mold The BMC resin introduced into the sprue bush is supplied through the manifold to the cavity formed by the upper cavity and the lower cavity of the upper mold and the lower mold, and the product is cured and cured in the mold. The fifth object is to provide an injection molding method using a BMC to be taken out.

Injection molding mold using the BMC (BMC) of the present invention for achieving the above object, the upper core constituting the upper cavity forming the upper shape of the product with the sprue bushing is a BMC (BMC) material It is installed to be maintained at the melting temperature of, the upper mold is fixed to the template of the side of the injection molding machine is injected into the injection molding machine of the BMC (BMC) and fixed to the rear mold to be transported to be detached from the upper mold of the injection molding machine Including a lower mold seated on the lower core constituting the lower cavity to form a lower cavity of the product while maintaining the melting temperature of the BMC (BMC) material, the sprue bush is installed in the upper center, the sprue The material of the BMC injected through the bush is guided to the gate part or the sprue part communicating with the runner part and the upper cavity so that the upper cavity and the lower cavity It includes a manifold to be supplied, wherein the manifold is not a solid state of the material injected from the injection molding machine supplied to the upper cavity and the lower cavity (BMC) is neither a solid state nor a state of melt hardening by reacting Characterized in that it is installed to maintain the temperature of the state.

Injection molding mold using the BMC (BMC) of the present invention, the sealing O-ring is installed on any one side of the parting line of the upper mold and the lower mold so as to surround the at least one cavity consisting of the upper cavity and the lower cavity, and the cavity Gas vents formed extending from the, characterized in that it has a vacuum hole connected to the gas vent and connected to the gas vent.

The injection molding mold using the BMC of the present invention is characterized in that an overflow receiving portion is formed at a predetermined interval around at least one of the upper cavity and the lower cavity.

The injection molding mold using the BMC of the present invention comprises a first heat insulating plate configured to insulate an upper mold and installed between the upper fixing plate accommodating the manifold and the upper base to which the upper core is fixed, and the rear side. A second heat insulating plate installed in the lower mold to prevent heat transfer to the mold plate, a third heat insulating plate which blocks heat transfer by the temperature of the mold to the gate portion of the product formed by the cavity, and flows in from the manifold The BMC resin is characterized in that it has a cooling block is installed so that the cooling water is supplied from the chiller, which is an external rapid cooler to be rapidly cooled in the sprue of the product.

Injection molding method using the BMC of the present invention, the step of pressing the upper mold and the lower mold of the injection molding mold using the BMC (BMC) formed of the cavity of the product formed by the upper cavity and the lower cavity, Heating the upper core, the lower core and the manifold of the injection molding mold using the BMC, and a lower cavity provided in the upper cavity or the lower mold provided in the upper mold of the injection molding mold using the BMC. Forming a vacuum by operating a vacuum pump connected to a vacuum line formed of a formed gas vent and a vacuum hole, injecting a BMC resin into the cavity through a sprue bush installed in the upper mold, and The BMC resin introduced into the Lubush is guided to the gate portion or sprue portion formed in communication with the runner portion and the upper cavity so that the upper cavity It is flowed using the manifold to be supplied to the lower cavity, so that the material of the BMC injected from the injection molding machine is maintained at a temperature at which only the flow is not a solid state and not a state of melting and curing that reacts and hardens. BMC filling step supplied by the manifold, and curing the product in the cavity after the BMC filling step, and cured in the injection molding mold using the BMC (BMC) And taking out the product in a state in which the gate part or the sprue part is connected.

As described above, according to the injection molding mold using the BMC of the present invention, the material of the BMC injected through the sprue bush is guided to the runner part and the sprue part or the gate part so that the upper cavity and the lower cavity Including a manifold to be supplied to the manifold, the manifold is only a flow that is not a solid state, but not a state of melting hardened by reacting the material of the BMC injected from the injection molding machine supplied to the upper cavity and the lower cavity Since it is installed to be maintained at the temperature of the state, the material of the BMC (BMC) supplied to the mold from the gate portion or the secondary sprue has an effect that the runner may not be made in the injection molding mold unnecessarily.

According to the injection molding mold using the BMC (BMC) of the present invention, the sealing O-ring installed on any one side of the parting line of the upper mold and the lower mold so as to surround the at least one cavity consisting of the upper cavity and the lower cavity, and in the cavity There is an effect that the vacuum forming is possible by the gas vent is formed to extend and the vacuum hole is connected to the gas vent and connected to the vacuum pump.

According to the injection molding mold using the BMC of the present invention, an overflow receiving portion is formed at a predetermined interval around at least one of the upper cavity and the lower cavity, thereby preventing the unmolding.

According to the injection molding mold using the BMC of the present invention, the product and the sprue are easily separated from the manifold by preventing the temperature of the mold from being transferred to the outside or transferred to the sprue by the heat insulating plate and the cooling block. There is one effect.

According to the injection molding method using the BMC of the present invention, the upper mold and the lower mold of the mold in which the cavity of the product is formed, the mold is heated, the vacuum pump is operated by the vacuum line to operate the vacuum, BMC resin is injected into the sprue bush installed in the upper mold, and the cavity formed by the upper cavity and the lower cavity of the upper mold and the lower mold through the manifold of the BMC resin introduced into the sprue bush. It is supplied to the, and the product is cured and there is an effect that can take out the cured product in the mold.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is an assembled state widthwise longitudinal cross-sectional view showing an embodiment of the injection molding mold using the BMC (BMC) of the present invention, Figure 2 is an injection molding mold of an embodiment using the BMC (BMC) of the present invention Figure 3 is a longitudinal longitudinal cross-sectional view of the state, Figure 3 is a cross-sectional view showing a part taken out of the product of the embodiment using the BMC (BMC) of the present invention, Figure 4 is a state view of the upper mold in the parting line of Figure 2 5 is a state diagram of a lower mold viewed from the parting line PL of FIG. 2.

In describing the present invention, descriptions of well-known general configurations and operations of the injection molding mold will be omitted.

Injection molding mold (1000) using the BMC (BMC) of the present invention, as shown in Figures 1 to 4, the sprue bush 1110 and the top cavity (top side) forming the upper (one side) shape of the product ( The upper core 1120 constituting the 1121 is installed, the upper mold 1100 is fixed to the template on the side of the nozzle of the injection molding machine (not shown) and the rear mold to be transported to be detached from the upper mold of the injection molding machine The lower mold 1200 which is fixed but has a lower core 1210 constituting the lower cavity 1211 forming a lower (other side) shape of the product, and the sprue bush 1110 are installed in the upper center, The material of the BMC injected from the injection molding machine supplied to the upper cavity 1021 and the lower cavity 1211 through the sprue bush 1110 is in communication with the runner part 1320 and the upper cavity 1121. Guided to gate portion 1330 or sprue portion 1340 And a manifold 1300 (MANIFOLD) configured to supply the upper cavity 1121 and the lower cavity 1211.

Therefore, when the BMC (Bulk Molding Compound) is injected from the nozzle of the injection molding machine into the sprue bush 1110, the upper cavity 1021 of the upper mold 1100 and the lower mold 1200 through the manifold 1300. The resin is supplied to the lower cavity 1211 and the product is molded.

At this time, the manifold 1300 is installed in the upper mold 1100 so that hot water of 50 ~ 60 ℃ is circulated along the circulation passage 1310, the manifold 1300 is maintained at a constant temperature of 50 ~ 60 ℃, As the BMC material is installed at a temperature that is not a solid state or a state of flowing only, not a melted state that is cured by reaction, the resin is prevented from hardening inside the manifold 1300, which is unnecessary. It is possible to prevent the creation of runners.

That is, when the manifold 1300 is maintained at 50 ° C. or less, unmolding occurs due to poor fluidity, and when the manifold 1300 is maintained at 60 ° C. or more, curing is started and appearance defects occur, thereby preventing production.

Here, the upper core fixing block 1150 is fixed to the upper mold 1100 to fix the upper core 1120 to the upper mold 1100, and to fix the lower core 1210 to the lower mold 1200. The lower core fixing block 1220 is fastened to the lower mold 1200.

As shown in FIGS. 1 to 5, the parting line of the upper mold 1100 and the lower mold 1200 to completely surround the at least one cavity C including the upper cavity 1121 and the lower cavity 1211. Sealing O-ring 1400 installed on any one of the side, the gas vent 1500 formed to extend from the cavity consisting of the upper cavity and the lower cavity, and the vacuum hole 1510 is connected to the gas vent is formed is connected to the vacuum pump Is formed.

In addition, the sealing O-ring 1400 is installed on any one of the parting lines of the upper mold 1100 and the lower mold 1200 in order to be installed on any one of the parting lines of the upper mold 1100 and the lower mold 1200. An o-ring seating groove 1410 for seating the o-ring 1400 is formed.

That is, the O-ring seating groove 1410 is preferably formed in any one of the upper core 1120 or the lower core 1210, in this embodiment is shown in the lower core 1210.

Accordingly, when the upper mold 1100 and the lower mold 1200 are pressurized, air is prevented from being introduced into the cavity C from the outside by the sealing O-ring 1400 and the O-ring seating groove 1410.

In addition, in the present embodiment, as shown in FIG. 5, the gas vent 1500 is connected to a plurality of places of the lower cavity 1211 constituting the cavity C, and the lower cavity constituting the cavity C ( 1211) is formed around a certain width and depth around the wrap.

On the other hand, when the vacuum pump is operated by a vacuum hole 1510 connected to the vacuum pump and connected to the gas vent, air is sucked in and the air is not introduced from the outside by the sealing O-ring 1400. This results in improving the flow of BMC resin during injection.

In the present embodiment, the vacuum hole 1510 has an example in which two cavities C are formed in two places.

And the heater rod 1600 is the upper mold 1100 and the lower mold (1) to manage the mold temperature to 140 ~ 160 ℃ around the cavity (C) consisting of the upper cavity 1121 and the lower cavity 1211 ( 1200 is provided in plurality at regular intervals.

Managing the mold temperature at 140 ~ 160 ℃ as described above is to obtain a result of improving the productivity by bringing the cycle of the BMC (BMC) resin to shorten the cycle time. Of course, the mold temperature can be adjusted according to the additives and molding time of the product.

In addition, the overflow receiving portion 1700 is formed at a predetermined interval around at least one of the upper cavity and the lower cavity.

When the overflow receiving portion 1700 is not tightly adhered in the parting line when the upper cavity 1121 and the lower cavity 1211 are joined, that is, the protrusion height of the sealing O-ring 1400 is high, In case of overfilling, it is installed to make up for this, which prevents the molding and speeds up the resin flow.

Meanwhile, the first insulating plate 1810 installed for insulation between the upper fixing plate accommodating the manifold and the upper base on which the upper core is fixed, and the lower mold to prevent heat transfer to the rear template. A heat insulating plate portion 1800 including a second heat insulating plate 1820 installed in the mold and a third heat insulating plate 1830 for blocking heat transfer by the temperature of the mold is installed on the gate portion of the product formed by the cavity.

Therefore, the temperature of the mold managed at 140 to 160 ° C. by the first and second insulating plates 1810 and 1820 of the heat insulating plate part 1800 is transferred to the mold of the injection machine, thereby preventing the temperature of the mold from being lowered. The heat transfer to the cooling block 1900 is prevented by the three heat insulating plates 1830.

And a cooling block (1900) is installed so that the cooling water supplied from the chiller (not shown) of the external cooler so that the BMC (BMC) resin flowing from the manifold (1300) is rapidly cooled at the sprue or gate portion of the product is installed It is desirable to be.

Therefore, when the eject plate 1130 and the eject pin 1140 installed on the upper mold 1100 are operated by hydraulic pressure to push down the product, the sprue portion of the product is quickly hardened by the cooling block 1900. To ensure good cutting at the sprue of the product.

Hereinafter, an injection molding method using the BMC of the present invention will be described.

As shown in FIG. 6, the upper mold 1100 and the lower part of the injection molding mold 1000 using the BMC BMC in which the cavity C of the product is formed by the upper cavity 1121 and the lower cavity 1211. Pressing the mold 1200 (S1), and heating the upper core (1120) and lower core (1210) and the manifold (1300) of the injection molding mold using the BMC (S2) and The gas vent 1500 and the vacuum hole formed in the upper cavity 1121 or the lower cavity 1211 provided in the lower mold 1200 are provided in the upper mold 1100 of the injection molding mold using the BMC (BMC). A vacuum pump connected to the vacuum line consisting of 1510 is operated to form a vacuum (S3), and the BMC resin (BMC) resin is injected into the cavity through the sprue bush 1110 installed in the upper mold SMC and the BMC resin introduced into the sprue bush 1110 are connected to the runner part 1320 and the upper cavity 1121. It is flowed by using the manifold (1300) to be guided to the gate portion 1330 or the sprue portion 1340 formed to be supplied to the upper cavity 1121 and the lower cavity 1211, the BMC (injected from the injection molding machine ( BMC filling supplied by COLD MANIFOLD to keep the material of BMC) at a temperature of 50 ~ 60 ℃ in a state of only flow, not of solid state, not of reaction molten to harden by reaction. Step (S5), the step of curing the product in the cavity after the BMC (BMC) filling step (S6), and the cured product in the injection molding mold using the BMC (BMC) gate portion 1330 Or taking out the sprue portion 1340 in a connected state (S7).

Therefore, the upper mold 1100 of the injection molding mold 1000 using the BMC (BMC) is formed through the step (S2) of heating the injection molding mold using the BMC (BMC). Pressing the lower mold 1200 (S1), and the lower cavity provided in the upper cavity 1121 or lower mold 1200 provided in the upper mold 1100 of the injection molding mold using the BMC (BMC). The sprue bush 1110 installed in the upper mold in a state in which the vacuum pump connected to the vacuum line including the gas vent 1500 and the vacuum hole 1510 formed at 1211 is operated to form a vacuum (S3). The BMC resin is filled in the cavity C through the step S4 in which the BMC resin is injected through the manifold 1300 maintained at 50 to 60 ° C. (S5).

At this time, the BMC resin introduced into the sprue bush is supplied to the cavity formed by the upper cavity and the lower cavity of the upper mold and the lower mold through a manifold 1300 of 50 to 60 ° C. installed in the upper mold. The product is molded.

After the step of curing the BMC (BMC) filling the product after a certain period of time (S6), the product hardened in the injection molding mold using the BMC (BMC) and the upper mold (1100) and the lower With the separation of the mold 1200, the product seated on the upper mold or the lower immersion by the eject plate 1130 and the eject pin 1140 operated by the hydraulic operation is taken out (S7).

In this case, the third insulation plate 1830 and the cooling block 1900 are cut out together with the product at the gate portion 1330 or the sprue portion 1340. Since the BMC resin remaining in the gate part 1330 or the sprue part 1340 is maintained in a flowable state, the upper mold (B) through the gate part 1330 or the sprue part 1340 during injection. The upper cavity 1121 and the lower cavity 1211 of the 1100 and the lower mold 1200 are supplied again to form a product repeatedly.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Figure 1 is an assembled longitudinal cross-sectional view showing an injection molding mold of an embodiment using the BC of the present invention,

Figure 2 is an assembly longitudinal longitudinal cross-sectional view showing an injection molding mold of an embodiment using the BC of the present invention;

3 is a cross-sectional view showing a portion of the product taken out of the embodiment using the BC of the present invention,

4 is a state view of the upper mold in the parting line of FIG.

5 is a view illustrating a lower mold in the parting line PL of FIG. 2;

Figure 6 is a block diagram showing an injection molding method using the BC of the present invention.

<Brief Description of Drawings>

1000: injection molding mold using BMC 1100: upper mold

1110: sprue bush 1120: upper core

1121: upper cavity 1130: eject plate

1140: eject pin 1200: lower mold

1210: lower core 1211: lower cavity

1300: room temperature manifold 1400: sealing O-ring

1410: O-ring seating groove 1500: gas vent

1510: vacuum hole 1600: heater rod

1700: overflow receiving portion 1800: insulating plate portion

1900: Cooling block C: Cavity

Claims (5)

The sprue bush 1110 is installed and the upper core 1120 constituting the upper cavity 1121 constituting the upper shape of the product is installed to be maintained at the melting temperature of the BMC (BMC), The upper mold 1100 fixed to the template on the side of the injection molding machine nozzle is injected into the injection molding material, and fixed to the rear template to be transported to be detached from the upper mold 1100 of the injection molding machine, while forming the lower shape of the product In the injection molding mold using a BMC comprising a lower mold (1200) on which a lower core (1210) constituting a lower cavity (1211) maintained at a melting temperature of a seed material (BMC), The sprue bush 1110 is installed at the upper center, and a material of the BMC injected through the sprue bush 1110 communicates with the runner 1320 and the upper cavity 1121. 1330 or the sprue portion 1340 further includes a manifold 1300 to be supplied to the upper cavity 1121 and the lower cavity 1211, The manifold 1300 is not a solid state, but a state of melting that hardens by reacting the material of the BMC injected from the injection molding machine supplied to the upper cavity 1121 and the lower cavity 1211. Injection molding mold using BMC, characterized in that installed so as to be maintained at a temperature of 50 ~ 60 ℃ of the state. The method of claim 1, Sealing O-ring 1400 installed on any one side of the parting line of the upper mold 1100 and the lower mold 1200 so as to completely wrap the at least one cavity consisting of the upper cavity 1121 and the lower cavity 1211, A gas vent 1500 extending from the cavity; Injection molding mold using a BC, characterized in that the vacuum vent is connected to the gas vent and connected to the vacuum pump (1510). The method of claim 2, Injection molding mold using the BC, characterized in that the overflow receiving portion (1700) is formed at a predetermined interval around at least one of the upper cavity (1121) and the lower cavity (1211). The method according to any one of claims 1 to 3, The first insulating plate 1810 constituting the upper mold 1100 and installed for insulation between the upper fixing plate 1101 accommodating the manifold 1300 and the upper base 1102 to which the upper core 1120 is fixed. and, A second heat insulating plate 1820 installed in the lower mold 1200 to prevent heat from being transferred to the rear template; A third insulating plate 1830 for blocking heat transfer from the mold temperature to the gate portion 1330 of the product formed by the cavity formed by the upper cavity 1121 and the lower cavity 1211, and The cooling block 1900 installed so that the BMC resin flowing from the manifold 1300 is supplied with coolant from the chiller, which is an external rapid cooler, to be rapidly cooled at the gate portion 1330 of the manifold 1300. Injection molding mold using BC, characterized in that equipped with. Pressing the upper mold 1100 and the lower mold 1200 of the injection molding mold using the BMC (BMC) formed with the cavity of the product formed by the upper cavity 1121 and the lower cavity 1211, Heating the upper core 1120, the lower core 1210, and the manifold 1300 of the injection molding mold using the BC; The gas vent 1500 and the vacuum hole formed in the upper cavity 1121 or the lower cavity 1211 provided in the lower mold 1200 of the upper mold 1100 of the injection molding mold using the BMC (BMC) ( Operating a vacuum pump connected to the vacuum line consisting of 1510 to form a vacuum,  BMC resin is injected into the cavity through the sprue bush 1110 installed in the upper mold 1100,  The BMC resin introduced into the sprue bush 1110 is guided to the gate portion 1330 or the sprue portion 1340 formed in communication with the runner portion 1320 and the upper cavity 1121, and thus the upper cavity 1121. ) And the manifold 1300 to be supplied to the lower cavity 1211, but the material of the BMC injected from the injection molding machine is neither a solid state nor a state of melting that reacts and hardens. BMC filling step to be supplied by the manifold (COLD MANIFOLD) of 50 ~ 60 ℃ to maintain the temperature of the full state,  Curing the product in the cavity that has passed the BMC filling step; And ejecting the cured product in the injection molding mold using the BMC with the gate portion 1330 or the sprue portion 1340 connected thereto.

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