KR100391574B1 - Mold Device for Projection Forming and the Process Utilizing Thereof - Google Patents

Abstract

The present invention relates to a molding apparatus for injection molding and an injection molding method using the same, so that the injection portion of the molten resin can be disposed in the center of the mold apparatus to achieve smooth operation and extended life by eliminating one-sided load and one-sided operation. By forming the product by the compression process with the gate pin blocking the runner, the structure of the product is compact, so there is little deformation. Especially, the gate is completely separated from the inside when the product is finished. This provides the effect that no cumbersome work has to be done to separate the part formed by the gate.

Description

Mold device for injection molding and injection molding method using the same {Mold Device for Projection Forming and the Process Utilizing Thereof}

The present invention relates to a mold apparatus and a method for molding an article using the mold apparatus. In particular, an injection molding mold apparatus and an injection mold using the same may be used to obtain necessary products such as a block connector used to connect blocks by injecting molten resin. It relates to a molding method.

In general, there are many methods for molding an article of a required shape, but injection molding is often used to make an article with a required shape using a resin. The most important thing in this injection molding is a mold apparatus in which an inner space of a forming to be made is formed. This will be described with reference to FIGS. 1 to 4.

1 is a cross-sectional view showing an example of a conventional injection mold apparatus, Figure 2 is a plan view showing an example of a conventional injection mold apparatus, Figure 3 is a side assembly of the block connector made using the injection mold apparatus shown in Figs. 4 is a view for explaining the deformation of the block connector made using the injection mold apparatus shown in FIGS.

1 to 2, the injection molding die apparatus 100 includes a first support plate 110. As shown in FIG. The first support plate 110 is formed with a hole 112 at a position eccentric to one side, and a sprue bush 120 having a molten resin moving path 122 is coupled thereto, and onto the surface thereof. An injection assisting tool 130 having an injection hole 132 for easily injecting molten resin through a nozzle or the like is fastened with a bolt 140.

As shown, the first support plate 110 includes a first upper core 150, a second phase core 160, and an upper plate that accommodates and supports the first phase core 150 and the second phase core 160. 170) are combined. A through hole 152 is formed in the first upper core 150 to allow the lower side of the sprue bush 120 to pass therethrough, and the runner 182 of the first lower core 180 is disposed at one lower surface of the first upper core 150. . As shown, the first phase core 150 is provided with a second phase core 160. The second phase core 160 is supported by the first phase core 150 and determines a surface shape of one side of the product to be molded.

As shown in the drawing, the second support plate 190 faces the first support plate 110. The second support plate 190 is provided with a lower plate 200 through a space block 192, and the lower plate 200 is provided with a first lower core 180 and a second lower core 210, respectively. It is. The first lower core 180 supported by the second lower core 210 is a part for determining the surface shape of the other side of the product formed together with the second phase core 160 and the lower plate 200 through the bolt 142. It is fixed to). A runner 182 is formed on one surface of the first lower core 180 to guide the molten resin injected through the sprue bush 120 to the gate 184.

As shown, the first and second ejection plates 196 and 198 for vertically operating the movable member 194 and the movable member 194 in the space between the second support plate 190 and the lower plate 200. Is installed, and the moving member 194 is coupled to the product to be molded and the mill pin (199) for leaving the gate molded product molded in the gate integrally connected to the product.

As can be seen in Figure 1, in the conventional injection molding mold apparatus 100, the injection aid tool 130 and the sprue bush 120 for injecting the resin is provided at a position biased to one side. In addition, the space in which the gate 184 and the product are molded are communicated with each other for supplying molten resin.

That is, when the molten resin is injected through the injection assisting tool 130 through the nozzle of the injection molding machine in the state as shown in FIG. 1, the runner 182 passes through the molten resin moving path 122 formed on the sprue bush 120. ) Is injected into the inner space formed by the second phase core 160 and the first lower core 180 through the gate 184. After a certain curing time, the mold is opened, the molded product is separated from the mill pin 199, and the product is completed by manually removing a part formed by the gate 184 and the runner 182 from the molded product.

In the case of using the conventional injection molding apparatus as described above, the injection aid tool 130, the sprue bush 120, the gate 184, and the like are disposed at one side of the first and second ejection plates ( 196, 198 has a disadvantage in that the productivity is not smoothly performed. In addition, since the molded part of the gate 184 is not automatically cut from the product, it is inconvenient to separate it manually, and since the trace remains on the product even when the molded part is removed by the gate 184. There is also a problem of poor commerciality. In addition, in order to use the block connector 10 as shown in FIG. 3, deformation should not occur. If not, the deformation occurs as shown in FIG. 4.

In other words, when a molded article is taken out by a conventional injection molding apparatus and an injection molding method, since a large amount of deformation occurs in the molded article, a serious problem arises that it cannot be used unless the shape is corrected with a jig.

An object of the present invention is to facilitate the operation and to automatically remove the unnecessary part formed by the gate from the molded product to improve the product productivity, as well as less deformation of the molded product does not need to correct the shape with a separate jig The present invention provides a mold apparatus for injection molding.

Another object of the present invention to provide an injection molded article manufacturing method for producing a molded article that does not cause deformation by using the injection molding die apparatus of the present invention.

1 is a cross-sectional view showing an example of a conventional injection mold apparatus,

2 is a plan view showing an example of a conventional injection mold apparatus,

3 is a side assembly view of a block connector made using the injection mold apparatus shown in FIGS.

Figure 4 is a view for explaining the deformation of the block connector made using the injection mold apparatus shown in Figs.

5 is a side cross-sectional view of an injection molding mold according to the present invention;

6 is a front sectional view of an injection molding mold according to the present invention;

7 is a plan view thereof;

8 is a partial perspective view of the first phase core,

9 is a bottom perspective view of the first phase core of FIG. 8,

10 is a cross-sectional view according to FIG. 8 I-I;

11 is a view schematically showing a relationship between a mold apparatus and an injection nozzle;

12 is a detailed view near the gate during the injection process;

13 is a detailed view near the gate during the compression process.

Explanation of symbols on the main parts of the drawings

300: mold apparatus 310: upper mold portion

320: injection aid 330: first support plate

340: sprue bush 342: molten resin moving furnace

350: first phase core 352: gate

354: Runner 360: 2nd phase core

370: Senate 390: lower die

400: second support plate 402: first mill pin

404: second mil pin 405: gate pin

410: Space Block 420: House of Representatives

430: the first hardcore 440: the second hardcore

450: spacing adjusting mechanism 452: hydraulic cylinder

454: touch rod 456: touch block

An object of the present invention is to install a predetermined injection molding machine, in the injection molding die apparatus for injecting molten resin to obtain a product of the required shape, the injection having a resin injection hole in which the injection nozzle of the injection molding machine is inserted A sprue bush providing a moving path of the molten resin injected through the assisting tool and the injection assisting tool is provided with a first support plate provided at the center and a runner for guiding the injected molten resin from the center to the gate formed at the opposite edge through one side edge. An upper mold portion, a first support plate, and a first support plate coupled to the first phase core and the first phase core and having a second phase core for determining one side surface shape of the molded article, and a top plate for receiving and supporting the first and second phase cores; The first milpin for facing away from the molded article and the second milpin for leaving the gate molded article Distance between the first lower core and the first phase core, which is installed on the second supporting plate and the second supporting plate, and is installed on the lower plate and the core mounting groove having the core mounting groove formed at the center thereof to determine the surface shape of the other side of the molten resin. The gap adjusting mechanism for adjusting the gap between the upper plate and the lower plate, if necessary, is installed between the lower die and the upper plate and the lower plate formed with a gate pin for opening and closing the movement path of the molten resin supplied to the gate according to It can be achieved by an injection molding die apparatus comprising a.

The upper gate is recessed in the first phase core so that the gate is blocked from the inside due to the first phase core being in contact with the first lower core, and the lower gate supports the first lower core below the first lower core. Two lower cores are installed, and the upper gap adjusting mechanism is installed on the touch rod and the upper plate which are adjusted by the hydraulic cylinder and the hydraulic cylinder installed on the lower plate and transmits the power of the hydraulic cylinder to the upper plate by the touch rod. It is preferable that the configuration consisting of a touch block to allow the interval between the lower plate and the lower plate.

Another object of the present invention is an injection molding method, comprising: preparing an injection molding mold apparatus according to the present invention, a first separation step of spaced apart a predetermined distance from an upper mold portion and a lower mold portion by using a gap adjusting mechanism, an injection molding mold; A resin injection step of injecting molten resin into the device, a first approach step of driving the gap adjusting mechanism to reduce the gap between the upper mold part and the lower mold part so that the gate pin blocks the runner, and the upper mold part and the lower mold part with the moving path closed. The second approach step to continue the compression process by reducing the interval of the gap and finally the gate is blocked from the inside, the second separation step of opening the mold by separating the upper and lower molds and the first mil pin and the second installed in the lower mold Dal by injection molding mold apparatus characterized in that it comprises a product leaving step of leaving each of the product and the gate molded molded with a pin It is possible.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 5 is a side cross-sectional view of the injection molding mold according to the invention, Figure 6 is a front sectional view of the injection molding mold according to the invention, Figure 7 is a plan view thereof.

5 to 7, the injection molding die apparatus 300 according to the present invention includes an upper mold part 310. The upper mold portion 310 is provided with an injection aid (320) having a resin injection hole 322 into which the injection nozzle of the injection molding machine is inserted. This injection aid 320 is to facilitate the injection of molten resin, unlike the conventional one is provided in the center portion of the first support plate 330. The sprue bush 340 is coupled to the lower side of the injection aid 320 through a hole 332 formed in the first support plate 330. The sprue bush 340 provides a moving path 342 of the molten resin injected through the injection aid 320.

As illustrated, the upper die 310 has a first phase core 350. The first phase core 350 has a runner 354 for guiding the injected molten resin from the center portion through one side edge to the opposite edge gate 352 and a gate 352 for allowing molten resin to be injected into the molding space. Is formed. The first phase core 350 is a part of one aspect of the present invention, which will be described in more detail later.

The second phase core 360 is coupled to the first phase core 350 through the bolt 365. The second phase core 360 is a part for determining the surface shape of one side of the molded article and is a part made according to the surface shape of the molded article to be molded. The first phase core 350 and the second phase core 360 are accommodated in the upper plate 370.

Injection molding mold apparatus 300 according to the present invention is provided with a lower mold 390. The lower die portion 390 is a portion corresponding to the upper die portion 310 and includes a second support plate 400 disposed to face the first support plate 310 at a predetermined interval. The second support plate 400 is provided with a first mill pin 402 for detaching the molded product and a second mill pin 404 for detaching the molded article formed at the gate 352.

As shown, the lower support plate 420 is coupled to the second support plate 400 at a predetermined interval with the space block 410 interposed therebetween. The lower plate 420 is provided with a core installation groove 422 in the center portion thereof, the first lower core 430 and the second lower core 440 in the core mounting groove 422 of the lower plate 420. ) Is installed. The first lower core 430 is a portion for determining the surface shape of the other side of the molten resin and forms a space in which the second phase core 360 and the product shape to be molded are formed. The second lower core 440 is coupled to the lower side of the first lower core 430.

As can be seen in Figure 6, the gate pin 405 is provided at one end of the first lower core 430. The Kate pin 405 is also a part that makes a big feature of the present invention to open and close the runner 354 of the first phase core 350 at an appropriate time. That is, the gate pin 405 opens and closes the movement path of the molten resin supplied to the gate 352 according to the distance from the first phase core 350.

As shown in the figure, a space between the second support plate 400 and the lower plate 420 moves the member 406 and the first eject plate 408 and the second eject plate 409 for vertically operating the movable member 406. ) Is installed, the first mil pin 402 and the second mil pin 404 is coupled to the product to be molded in the moving member 406 and the gate molded product formed from the gate and the molded product separated from the molding process have.

Injection molding mold apparatus 300 according to the present invention is provided with a gap adjusting mechanism (450). The gap adjusting mechanism 450 is for allowing the gap between the upper mold portion 310 and the lower mold portion 390 to be properly maintained according to the injection molding process sequence. The gap adjusting mechanism 450 is installed on the hydraulic cylinder 452 installed on the lower plate 420, the touch rod 454 and the upper plate 370 length-adjusted by the hydraulic cylinder 452, and the touch rod 454. By the force of the hydraulic cylinder 452 to the upper plate 370 consists of a touch block 456 to adjust the gap between the upper plate 370 and the lower plate 420. Here, the hydraulic cylinder 452 may use a single-acting cylinder.

That is, by preparing the injection molding mold apparatus according to the present invention (mould preparation step), it is installed in a predetermined injection molding machine, in that state by pushing the upper mold portion 310 by using the above-described interval adjusting mechanism 450, the lower mold portion The 390 is spaced apart from the upper mold portion 310 by a predetermined distance (first separation step). At this time, the pressure of the hydraulic cylinder 452 does not open between the upper plate 370 and the first support plate 330 and the runner take-off plate 336 provided therebetween. In this state, molten resin is injected through the resin injection hole 322 of the injection aid tool 320. Then, the molten resin is injected into the internal space for forming the product through the runner 354 and the gate 352 formed in the first phase core 350 through the molten resin moving path 342 formed in the sprue bush 340. (Resin injection step).

When the resin is sufficiently injected, the gap adjusting mechanism 450 is driven to reduce the distance between the upper die 310 and the lower die 390 so that the gate pin 405 blocks the runner 354 (first approach step).

While the runner 354 is closed, the compression process is continued by further reducing the gap between the upper mold portion 310 and the lower mold portion 390. By this compression process, the cross-sectional structure of the product is dense and deformation is prevented after completion of the product. The upper mold portion 310 and the lower mold portion 390 are sufficiently approached so that the front edge of the gate 352 formed on the first upper core 350 is in contact with the surface of the first lower core 430 so that the product is molded. Blocked from being inside (second approach step).

When the product is molded in this way, the mold is opened while spaced apart from the upper mold part 310 and the lower mold part 390 through an injection machine. At this time, while the runner take-off plate 336 is spaced apart from the upper plate 370, the portion formed in the runner 354 is removed.

The upper mold part 310 and the lower mold part 390 are formed in the first and second ejection plate 408, 409 through the first and second ejection plate 408, the molded article and the gate formed by the second mill pin 404 Each of the moldings is separated (release step).

That is, the molding formed by the gate is released in a completely separated state from the product. Therefore, the molded article formed by the gate does not need to be separated from the product by a separate manual operation, and since the product is made by the compression process with the gate closed, no deformation occurs. In addition, since the injection aid tool 320 and the sprue bush 340, etc., into which the molten resin is injected, are installed in the center of the mold apparatus 300, the piece load or the piece operation disappears, so that the operation is smooth and the life is long.

8 is a partial perspective view of the first phase core, FIG. 9 is a bottom perspective view of the first phase core of FIG. 8, and FIG. 10 is a cross-sectional view taken along the line I-I of FIG. 8.

As shown in FIGS. 8 to 10, the first phase core 350 is formed with a runner 354 formed from the center toward one edge and bent downward, and a gate 352 is formed at the lower end of the runner 354. It is installed. As can be seen in FIG. 9, the gate 352 is formed in the shape of a concave groove surrounded by a protruding portion around the periphery.

FIG. 11 is a view schematically showing the arrangement relationship between a mold apparatus and an injection machine nozzle, FIG. 12 is a detailed view near the gate during the injection process, and FIG. 13 is a detailed view near the gate during the compression process.

When the molten resin is injected through the nozzle 10 in the state as shown in FIG. 11, the upper plate 370 and the lower plate 420 maintain a gap between the c and the first phase core 350 and the second phase. Since the runner 354 and the gate 352 are opened in the state in which the core 360 and the first lower core 430 are arranged as shown in FIG. 12, the molten resin is formed in the runner formed in the first phase core 350. It is injected into the product forming space formed by the second phase core 360 and the first lower core 430 via the 354 and the gate 352.

After the molten resin is injected, if the distance between the upper plate 370 and the lower plate 420 is reduced to d as shown in FIG. 13, the gate pin 405 blocks the runner 354. In this state, if the compression is further proceeded to the portion indicated by the dotted line, the resin filled therein continues to be compressed, and finally, when the mold is completely closed, the edge of the gate 352 of the first upper core 350 is formed at the edge of the first lower core 430. In contact with the surface, the interior and the gate 352 are completely blocked. That is, due to the compaction process in the closed state of the runner 354, the structure is not dense and deformation does not occur, and the portion formed by the gate 352 does not need to be separated from the product by manual labor.

As can be seen from the above description, in the case of using the injection molding die apparatus according to the present invention and the injection molding method using the same, the injection portion of the molten resin is located at the center portion, so there is no one-sided load and one-sided operation, so that the operation of the mold apparatus is smooth and lifespan. This long and compact structure due to the compacting process reduces the product deformation, so it is not necessary to fix it with a separate jig, and in particular, unnecessary parts formed by the gate, etc., because the molding is completed with the gate separated from the internal space. You do not need to remove it from the product. Due to these various advantages, the productivity of the mold apparatus and the injection molding method of the present invention can be increased, as well as the removal of other parts of the product can be maintained, and thus good quality can be maintained.

Claims (3)

In the injection molding die apparatus, which can be installed in a predetermined injection molding machine and injects molten resin to obtain a product having a desired shape, The first support plate and the injected molten resin in the central portion of the first support plate provided in the center and the spruce bush for providing a flow path for the molten resin injected through the injection aid and the injection aid having a resin injection hole is inserted into the injection nozzle of the injection molding machine A first phase core formed with a runner for guiding the gate formed at the opposite edge through the edge and the second phase core coupled to the first phase core to determine one side surface shape of the molded article and accommodating the first and second phase cores. An upper mold portion having a upper plate supported by the upper mold; A second support plate and a second support plate, which are disposed to face the first support plate at a predetermined interval and are provided with a first milling pin for detaching a molded product and a second milling pin for leaving a molded article, and a core in a central portion. Opening and closing the moving path of the molten resin supplied to the gate in accordance with the distance between the first lower core and the first phase core which is installed in the lower plate and the core mounting groove formed with an installation groove to determine the surface shape of the other side of the molten resin A lower die portion having a gate pin formed therein; And a gap adjusting mechanism installed between the upper plate and the lower plate to adjust a gap between the upper plate and the lower plate. The method of claim 1, wherein the gate is formed concave on the surface of the first phase core so that the gate is blocked from the inside due to the first phase core is in contact with the first lower core, A second lower core supporting the first lower core is further installed downward, and the spacing adjusting mechanism is installed on the upper rod and the touch rod lengthwise adjusted by the hydraulic cylinder and the hydraulic cylinder. Injection mold apparatus, characterized in that consisting of a touch block for transmitting the force of the hydraulic cylinder to the upper plate by adjusting the distance between the upper plate and the lower plate. In the injection molding method, Preparing a mold apparatus for injection molding according to claim 1; A first separation step of spaced apart from the upper and lower molds by a predetermined distance by using the gap adjusting mechanism; A resin injection step of injecting molten resin into the injection molding die apparatus; A first approach step of driving the gap adjusting mechanism to reduce a distance between the upper mold part and the lower mold part so that the gate pin blocks the runner; A second approach step of continuing the compression process by finally reducing the gap between the upper mold part and the lower mold part while the moving path is closed, and finally blocking the gate from the inside; A second separation step of opening the mold by separating the upper mold part and the lower mold part; And And a product detachment step of detaching the molded product and the gate molding, respectively, by the first and second mil pins installed in the lower mold part.