KR20090050597A - Injection molding die and injection molding method using bmc - Google Patents

Abstract

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

Injection molding mold using the BMC of the present invention, the sprue bush is mounted and the upper core constituting the upper cavity constituting the upper shape of the product is installed, the template of the side of the nozzle of the injection molding machine for injection molding the BMC material is installed A lower mold fixed to the upper mold and a rear mold for transporting the upper mold of the injection molding machine to be detachably attached to the upper mold, and having a lower core constituting the lower cavity forming the lower shape of the product, and through the sprue bush. The material of the BMC (BMC) injected from the injection molding machine supplied to the upper cavity and the lower cavity includes a cold manifold (COLD MANIFOLD) installed to serve as a runner in the upper mold to accommodate the sprue bush. It is done.

BMC, room temperature manifold, cooling block

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 BMC (Bulk Molding Compound) and a method thereof, and in particular, because it is manufactured by injection molding, the molding cycle is fast, and productivity is improved, and the orientation of the fibers of BMC is generated, resulting in high strength. Of course, the present invention relates to an injection molding mold and a method using a BMC that can prevent the occurrence of unnecessary runners by seating the 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 (Bulk Molding Compound) resin is loaded into the lower molding part of the lower mold of the compression mold in which the heating heater is embedded, and is heated by pressing the upper molding part of the upper mold in which the heating heater is embedded to form the molding. Compression molding dominated.

However, this compression molding takes a lot of time due to the measurement of the BMC, the productivity is lowered, and a high gloss product is not obtained, while the added glass fibers do not have an orientation, resulting in 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 injected from the injection molding machine supplied to the upper cavity and the lower cavity through the sprue bush to the upper mold to accommodate the sprue bush. A first object is to provide an injection molding mold using BMC, which makes it unnecessary to make the runner unnecessary in the injection molding mold by a room temperature manifold installed to perform the role of a runner.

The present invention, the sealing O-ring installed on any one side of the upper mold and the lower mold parting line so as to surround the at least one cavity consisting of the upper cavity and the lower cavity, the gas vent formed extending from the cavity, and connected to the gas vent It is a second object to provide an injection molding mold using a BMC which is formed to enable vacuum molding by a vacuum hole connected to a vacuum pump.

It is a third object of the present invention to provide an injection molding mold using BMC, in which an overflow receiving portion is formed at a predetermined interval around at least one of the upper cavity and the lower cavity to prevent unmolding. .

The present invention provides an injection molding mold using a BMC that prevents 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 so that the product and the sprue are easily separated from the room temperature manifold. There are four purposes.

According to the present invention, the upper mold and the lower mold of the mold in which the cavity of the product is formed are pressurized, the mold is heated, and the vacuum pump is operated by the vacuum line to vacuum, and the BMC resin is injected into the sprue bush installed in the upper mold. 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 the room temperature manifold, and the product is cured to take out the cured product in the mold. A fifth object is to provide an injection molding method using seeds.

Injection molding mold using the BMC of the present invention for achieving the above object, the sprue bush is mounted and the upper core constituting the upper cavity forming the upper shape of the product is installed, the nozzle of the injection molding machine is installed A lower mold fixed to the upper mold fixed to the template of the lower mold, and a lower mold fixed to the rear mold to be detachably attached to the upper mold of the injection molding machine and having a lower core constituting the lower cavity forming the lower shape of the product; BMC material injected from the injection molding machine supplied to the upper cavity and the lower cavity through the room temperature manifold (COLD MANIFOLD) is installed to perform the role of a runner to the upper mold to accommodate the sprue bushing do.

Injection molding mold using the BC of the present invention, the sealing O-ring installed on any one side of the upper mold and the lower mold parting part to surround the at least one cavity consisting of the upper cavity and the lower cavity, and extends from the cavity The formed gas vent and a vacuum hole connected to the gas vent are connected to the vacuum pump.

The injection molding mold using the BC 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 insulation plate constituting an upper mold and installed between the upper fixing plate accommodating a room temperature manifold and the upper base to which the upper core is fixed, and heat transfer to the rear template. The second heat insulating plate installed in the lower mold to prevent this, the third heat insulating plate to block the heat transfer by the temperature of the mold to the gate portion of the product formed by the cavity and the BMC resin flowing from the manifold It 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 at the sprue of the product.

The injection molding method using the BMC of the present invention, pressurizing the upper mold and the lower mold of the injection molding mold using the BMC (BMC) formed product cavity, and heating the injection molding mold using the BMC and The vacuum pump is operated by the vacuum line consisting of a gas vent and a vacuum hole formed in the upper cavity or lower cavity provided in the lower mold of the injection molding mold using the BCMC, and installed in the upper mold BMC resin is injected into the sprue bush, and 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 room temperature manifold installed in the upper mold. BMC filling step, the step of curing the product after the BMC filling step, using the BMC (BMC) It is characterized in that it comprises a step for taking out the cured product in the injection molding die.

As described above, according to the injection molding mold using the BMC of the present invention, the material of the BMC injected from the injection molding machine supplied to the upper cavity and the lower cavity through the sprue bush is placed in the upper mold to accommodate the sprue bush. The room temperature manifold installed to perform a role has an effect that the runner may not be made in an injection molding mold unnecessarily.

According to the injection molding mold using the BMC of the present invention, the sealing O-ring installed on either side of the upper mold and the lower mold parting line to completely cover at least one cavity consisting of the upper cavity and the lower cavity, and formed extending from the cavity There is an effect that the vacuum molding is enabled by the gas vent and the vacuum hole connected to the gas vent and connected to the gas vent.

According to the injection molding mold using the BMC of the present invention, the 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 BMC of the present invention, the effect of making the product and the sprue easily fall from the room temperature manifold by not losing the temperature of the mold to the outside or transferring to the sprue by the heat insulating plate and the cooling block. have.

According to the injection molding method using the BMC of the present invention, the upper mold and the lower mold of the mold is formed, the cavity of the product is formed, the mold is heated, the vacuum pump is operated by the vacuum line, the vacuum is installed on the upper mold BMC resin is injected into the sprue bush, and 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 the room temperature manifold, and the product is cured. There is an effect that can take out the cured product.

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

1 is an assembly state widthwise longitudinal cross-sectional view showing an injection molding mold of one embodiment using a BMC of the present invention, Figure 2 is an assembly state longitudinal longitudinal cross-sectional view showing an injection molding mold of an embodiment using a BMC of the present invention, Figure 3 is a cross-sectional view showing a portion of the product taken out of the embodiment using the BMC of the present invention, Figure 4 is a view of the upper mold in the parting line of Figure 2, Figure 5 parting line PL of FIG. This is a state view of the lower mold in.

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 BC of the present invention, as shown in Figures 1 to 4, is equipped with a sprue bush 1110 and constitutes an upper cavity 1121 forming an upper (one side) shape of the product. The upper core 1120 is installed, the upper mold 1100 is fixed to the mold of the side 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 product A lower mold 1200 in which the lower core 1210 constituting the lower cavity 1211 forming the lower (other side) of the upper mold is installed, and the upper cavity 1021 and the lower cavity 1211 through the sprue bush 1010. BMC material injected from the injection molding machine supplied to the) includes a room temperature manifold (1300; COLD MANIFOLD) installed to perform the role of a runner in the upper mold 1100 to accommodate the sprue bush 1010.

Therefore, when the BMC (Bulk Molding Compound) is injected from the nozzle of the injection molding machine into the sprue bush 1010, the upper cavity 1021 of the upper mold 1100 and the lower mold 1200 through the room temperature manifold 1300. ) And the lower cavity 1211 to supply the resin is molded.

At this time, the room temperature manifold (1300) is installed in the upper mold (1100) so that hot water of 50 ~ 60 ℃ is circulated along the circulation passage 1310, and prevents the resin from hardening as it is installed at a constant temperature, It is possible to prevent the generation of unnecessary runners.

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 flow of the BMC resin faster and bring the cycle time shorter.

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 securely adhered to the parting line when the upper cavity 1121 and the lower cavity 1211 are joined, that is, the protruding height by the sealing o-ring 1400 is high. If the resin is overflowing, it is installed to compensate for this, which prevents the unmolding and speeds up the flow of the resin.

Meanwhile, the first insulation plate 1810 installed to insulate the upper mold and the upper fixing plate accommodating a room temperature manifold and the upper base to which the upper core is fixed, and the heat transfer to the rear template are prevented. A heat insulation plate portion 1800 including a second insulation plate 1820 installed in the lower mold and a third insulation plate 1830 for blocking heat transfer by the temperature of the mold is installed at 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 it is preferable that the cooling block (1900) is installed so that the cooling water is supplied from the chiller, which is not shown in the external cooler so that the BMC resin flowing from the room temperature manifold (1300) is rapidly cooled at the sprue of the product.

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 BC of the present invention will be described.

As shown in FIG. 6, the step S1 of pressing the upper mold 1100 and the lower mold 1200 of the injection molding mold 1000 using the BMC BMC in which the product cavity C is formed, and Heating the injection molding mold using the BC (S2), and the lower cavity 1211 provided in the upper cavity 1121 or lower mold 1200 provided in the upper mold 1100 of the injection mold using the BC. Vacuum pump is operated by a vacuum line consisting of a gas vent 1500 and a vacuum hole 1510 formed in the step (S3) and the step of injecting the BMC resin into the sprue bush 1110 installed in the upper mold BMC filling step (S4) and 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 the room temperature manifold 1300 installed in the upper mold ( S5) and the product after the BMC filling step Step (S6) and taking out the cured product in the injection molding mold using the BMC (BMC) (S7).

Therefore, the upper mold 1100 and the lower mold 1200 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 is formed. Pressing step (S1), and the gas vent formed in the upper cavity (1121) or lower cavity (1211) provided in the lower mold (1200) provided in the upper mold (1100) of the injection molding mold using the BC ( 1500 and the vacuum line 1510, the vacuum pump is operated to vacuum the step (S3) in the state in which the BMC resin is injected into the sprue bush 1110 installed in the upper mold (S4) BMC resin is filled in the cavity (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 the room temperature manifold 1300 installed in the upper mold, thereby forming a product.

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

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 upper mold which is mounted to the sprue bush and the upper core constituting the upper cavity constituting the upper shape of the product, is fixed to the template on the side of the nozzle of the injection molding machine for ejecting the BMC material, A lower mold fixed to a rear template to be detachably attached to the upper mold of the injection molding machine and having a lower core constituting a lower cavity forming a lower shape of a product; Cold manifold (COLD MANIFOLD) installed to act as a runner in the upper mold 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 bushing Injection molding mold using BC, characterized in that it comprises a). The method of claim 1, An o-ring for sealing installed on any one side of a parting line of an upper mold and a lower mold so as to surround the at least one cavity consisting of the upper cavity and the lower cavity as a whole; A gas vent formed extending from the cavity, Injection molding mold using a BC, characterized in that the vacuum vent is connected to the gas vent is connected to the vacuum pump. The method of claim 2, Injection molding mold using the BC, characterized in that the overflow receiving portion is formed at a predetermined interval around at least one of the upper cavity and the lower cavity. The method according to any one of claims 1 to 3, A first heat insulating plate constituting the upper mold and installed for insulation between an upper fixing plate accommodating a room temperature manifold and an upper base on which the upper core is fixed; A second heat insulating plate installed on the lower mold to prevent heat from being transferred to the rear template; A third heat insulating plate for blocking heat transfer from the temperature of the mold to the gate portion of the product formed by the cavity; Injection molding mold using a BMC, characterized in that the BMC resin flowing from the manifold has a cooling block is installed so that the cooling water is supplied from the chiller which is an external rapid cooler so as to rapidly cool in the sprue of the product. Pressing the upper mold and the lower mold of the injection molding mold using the BMC (CMC) formed product cavity, Heating the injection molding mold using the BC; Operating and vacuuming the vacuum pump by a vacuum line including a gas vent and a vacuum hole formed in the upper cavity of the injection molding mold using the BC, or the lower cavity of the lower mold;  Injecting the BMC resin into the sprue bush installed in the upper mold,  BMC filling step into which 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 room temperature manifold installed in the upper mold,  Curing the product that has undergone the BMC filling step;  Injection molding method using a BMC comprising the step of taking out the cured product in the injection molding mold using the BMC (BMC).

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