KR100493790B1 - molding apparatus and molding method using the same - Google Patents

Abstract

The present invention can be injection molded neatly and firmly even from the product integrally molded from the whole integrally molded product using the high-pressure injection molding machine, which is a general-purpose facility, to simplify the production process of the product while being used interchangeably for the production of various products. The present invention relates to an injection molding apparatus capable of preventing post deformation of a product and improving reliability.

According to the present invention, a plurality of cores (20, 20 ', 20 ") are formed in connection with each other and coupled to the cavity (11) of the upper mold 10 to form an integrated molding space, each core 20, A plurality of compression cylinders 30 connected to 20 ', 20 "to selectively advance the cores 20, 20', 20" to the cavity 11, and the cores 20, 20 ', 20 Eject pin 23 provided to penetrate through the " ", the eject plate 24 fixedly installed and having an insertion hole 24a formed at a predetermined position, and the eject plate 24 being moved back and forth. It is connected to the eject cylinder 25 and the cores (20, 20 ', 20 ") and coupled to the insertion hole (24a) of the eject plate 24 so as to be forward and backward and the coupling portion proximal end of the ejector The engaging jaw 26a is formed to be caught in the insertion hole 24a of the core 20, 20 ', 20 "when the press plate advances toward the cavity 11 when the eject plate 24 advances together. It is provided with an injection molding device, characterized in that configured to include a linkage pin (26).

Description

Injection molding apparatus and injection molding method using the same {molding apparatus and molding method using the same}

The present invention relates to an injection molding apparatus and an injection molding method using the same, and more specifically, it is possible to perform injection molding neatly and firmly even from a product integrally molded to a product partially covered with a skin using a high pressure injection machine, which is a general-purpose facility. The present invention relates to an injection molding apparatus capable of simplifying a production process of a product while being compatible with various products and improving reliability by preventing post deformation of a product.

In general, the covering refers to a process of attaching a skin material to the surface of the molded substrate, and a representative example of the covering material formed by the covering method is an automobile interior material such as a door trim. Among the covering methods, the existing methods using injection molding include low pressure injection method and high pressure injection method. Among the low pressure injection methods, the hydraulic material of the injection machine is injected by setting the skin material on the upper mold, closing the mold, and injecting the low pressure molten resin. The force is used to compress the molten resin by reducing the product volume in the mold. At this time, the skin material is bonded to the surface of the substrate to be molded at the same time.

However, such a low pressure injection machine has a significant cost burden on facility investment as its price is quite high, and of course, there is a problem in that it is not compatible with various products as a dedicated machine.

In addition, the conventional covering method using a high-pressure injection machine is a separate covering method of injection molding at a high pressure by a general injection mold to transfer the cooled and solidified substrate to the covering mold and adhering a skin material to the surface of the substrate. Since the high pressure injection method uses a general press and an injection molding machine, the cost of constructing the equipment is lower than that of the low pressure injection method, but since the adhesive is sprayed on the surface of the substrate one by one, the skin material is adhered by a separate process. There is a problem that this poor productivity is significantly lowered, each time the spraying the adhesive material is polluted air in the workplace has a severe environmental pollution problem.

In addition, the high-pressure injection method is to harden by injection-molding the substrate at a high pressure, there is a problem that the post-deformation due to the residual stress due to severe variation in the molding pressure of each part of the product. In addition, since the substrate is molded and then the substrate is transferred to the covering mold to perform skin material adhesion, there is also a problem in that productivity is considerably reduced due to a long working time.

On the other hand, in recent years, as the vehicle model is diversified, the vehicle interior material that is only partially covered with the skin material has been developed and used. Such a product is a covering method of attaching the skin material to the surface of the product by a separate adhesive. Produces. However, this method of production, as described above, not only causes pollution of the air each time the adhesive is sprayed, but also the skin material and the substrate are not integrated, so that when the temperature inside the vehicle rises sharply during midday or the tropics, Since the heat resistance of the adhesive material between the interposition and the skin material is lowered to cause peeling of the skin material, there is a problem that the reliability is lowered.

However, in the method of partially covering with a general injection molding machine, a method of inserting the front-covered molded product in the corresponding space in the mold and insert injection may be considered, but a very high pressure is applied to the molten resin so that the molten resin acts as a skin material surface. The product is not clean, and of course, there is a problem such as damage to the skin material, the situation is not using this method in reality.

The present invention is to solve the above problems, an object of the present invention by using a high-pressure injection machine is a general-purpose equipment from the product integrally molded to the product partially covered with a skin material can be neatly and firmly injection molded a variety of products The present invention provides an injection molding apparatus and an injection molding method using the same, which can simplify the production process of the product and prevent post-deformation of the product, thereby improving reliability.

According to the first aspect of the present invention, the cores 20, 20 ′, 20 ″ are coupled to the cavity 11 of the upper die 10 so that the cavity 11 and the cores 20, 20 ′, 20 ″ are combined. In a conventional injection molding apparatus which forms a molding space having a predetermined shape therebetween, and injects molten resin at a high pressure through the hot nozzle 21 into the molding space to form a product. A plurality of cores 20, 20 ′, 20 ″ coupled to the cavity 11 of the core to form an integrated molding space, and connected to the respective cores 20, 20 ′, 20 ″ and the core 20 And a plurality of compression cylinders 30 for selectively pressing forward 20 ', 20 "toward the cavity 11, eject pins 23 installed to penetrate the cores 20, 20', and 20", The eject plate 23 is fixed to the eject plate 24 having an insertion hole 24a formed at a predetermined position, an eject cylinder 25 for advancing the eject plate 24 back and forth, and the cores 20 and 20. ', 20 ") It is installed and coupled back and forth to the insertion hole (24a) of the eject plate 24, the engaging portion (26a) is formed on the proximal end of the engaging portion is caught by the insertion hole (24a) of the rate is formed in the core ( 20, 20 ', 20 ") is provided with an injection molding apparatus characterized in that it comprises an interlocking pin 26 for advancing the eject plate 24 together when pressed forward toward the cavity (11).

According to a second aspect of the present invention, an upper mold 10 having a cavity 11 of a predetermined shape on one surface thereof is formed, and a molding space that is connected to each other and coupled to the cavity 11 of the upper mold 10 to be integrated. A plurality of cores 20, 20 ′, 20 ″ and a plurality of cores 20, 20 ′, 20 ″ which form a plurality of cores 20, 20 ′, 20 ″ to selectively form the cores 20, 20 ′, 20 ″. By inserting a part molded product (P) covered with a skin material by an injection molding apparatus equipped with a plurality of compression cylinders (30) for pressing forward to the pressure and a hot nozzle (21) for spraying molten resin at a high pressure in the molding space In the injection molding method of forming a mold, a partial molded product in which the upper mold 10 is separated from the cores 20 and 20 'and a skin material is covered on some cores 20' of the plurality of cores 20, 20 'and 20 ". Insert step of inserting (P), and the upper mold 10 is bonded to the core (20, 20 ') and the molded part (P) is used in the molding space that is not inserted Resin injection step of injecting molten resin to mold the product without the molten resin filled to the periphery of the molding space, and the partial molded product P of the plurality of cores 20 and 20 'is not disposed Only the cores 20 and 20 "are pressed and advanced toward the cavity 11 of the upper mold 10 by the compression cylinder 30, and the resin injected in the moldable state is compressed to be pushed out to the circumference of the molding space to completely form the product. An injection molding method is provided, comprising a compression molding step for discharging and a product taking-out step of taking out the molded product by separating the upper mold 10 from the cores 20 and 20 '.

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

1 is a cross-sectional view of the resin injection step by the injection molding apparatus according to the present invention. Referring to this, the injection molding apparatus divides the cores 20, 20 ', and 20 "into a plurality, and selectively presses the cores 20, 20' by the compression cylinder 30 so as to be selectively advanced. By inserting skin-covered partial molded products (P) as well as general injection molded parts, the parts can be used interchangeably, and the molten resin is injected into the molding space at high pressure to form the product. After the core (20, 20 ') by pressing the advancing toward the cavity 11 to completely form the product, it is to prevent the back deformation of the product.

The upper mold 10 has a cavity 11 having a shape corresponding to a plurality of cores 20, 20 ′, 20 ″ on one surface thereof, and is connected to the movable side template 2 to be installed on the movable side template 2. With each other.

The cores 20, 20 'and 20 "are configured such that a plurality of cores 20 and 20' are connected to each other and coupled to the cavity 11 of the upper mold 10. The molten resin is sprayed therein at a high pressure. At least one hot nozzle 21 is installed therethrough, and a support block 22a supported by the fixed side template 22 is provided at the rear of the cores 20, 20 ', and 20 " The molding pressure by injection prevents the cores 20, 20 ', 20 "from being pushed backwards so that compression molding can be started by the compression cylinder 30 at a constant position at all times.

The compression cylinder 30 is individually connected to a plurality of cores (20, 20 ') to selectively advance each core (20, 20') toward the cavity (11) of the upper die 10, high pressure injection It is intended for the complete molding by compressing the first molded product by.

The eject plate 24 is connected to the eject cylinder 25 to be moved forward and backward, and one side is provided with an eject pin 23 is installed through the core 20, 20 ', 20 "through the core. In addition, the eject plate 24 has an insertion hole 24a formed therein, and an interlocking pin 26 connected to the cores 20, 20 ′ and 20 ″ is mounted in the insertion hole 24a. At the rear end of the), a latching jaw 26a is formed to be caught by the insertion hole 24a so that the eject plate 24 is held together when the cores 20, 20 ′ and 20 ″ are pressed forward into the cavity 11. By advancing, the tip of the eject pin 23 is coplanar with the forming surfaces of the cores 20, 20 ', and 20 ".

As such, in order to advance the eject plate 24 together with the cores 20, 20 ′ and 20 ″ toward the upper mold 10, a coupling part may be provided at a coupling portion of the eject cylinder 25 and the eject plate 24. 29 is provided, the clearance coupling means 29 has a thickness of the coupling hole (29a) formed in the eject plate 24 between the pair of engaging jaw (29b) provided at the tip of the operating rod of the eject plate 24 It is thinner than the interval of so that the coupling hole (29a) of the eject plate 24 can be flowed back and forth between the pair of engaging jaw (29b).

In some cases, one side core is made of an inclined core 20 ', and the inclined core 20' is equipped with an inclined core pin 27 inclined to be connected to the eject plate 24. A liner groove 24b in a lateral direction is formed on one surface of the eject plate 24 connected to the pin 27, and the slider 24c is provided on the liner groove 24b such that the slider 24c can be moved left and right. It is configured to connect the inclined core pin 27 to. Therefore, when the product is taken out, the inclined core pin 27 slides left and right along the liner groove 24b, and the inclined core 20 'connected to the inclined core pin 26 is advanced in an inclined direction to undercut the product. Allow the product to be withdrawn from the product.

In addition, the support block 22a is provided with a blocking block 21a close to the upper die 10 along the periphery of the cores 20 and 20 'and serving as a parting line, so that the molten resin is formed during the temporary molding or compression molding. By preventing the outside of the cavity 11 to be pushed out, it is possible to prevent the occurrence of burrs and the like on the outside of the product to be molded.

On the other hand, the injection molding apparatus according to the above configuration can be injection-molded neatly and firmly even from a product of which the whole is integrally partly covered with skin material, and inserts a part molded product (P) covered with skin material to inject the product. Here's how.

An insert step of placing a skin-coated partial molded product P on a part of the cores 20 'of the plurality of cores 20, 20', and 20 "coupled to the upper mold 10, and the partial molded product P is not inserted. The resin injection step of injecting molten resin at high pressure into the unmolded space to mold the product, and only the core (20,20 ") in which the partial molded product (P) is not disposed by the compression cylinder (30) Compression molding step of pressing the advancing toward the complete molding, and product taking-out step of taking out the molded product by separating the upper mold 10 from the core (20, 20 ', 20 ").

The insert step retracts the movable side template 2 so that the upper die 10 is separated from the cores 20, 20 ′, 20 ″, and then the plurality of cores 20, 20 ′, 20 ″ coupled with the upper die 10. ) Is a step of disposing a partial molded product (P) covered with a skin material on some core 20 '. In this case, the partial molded article P may not be inserted into the core 20 ', but may be disposed in the cavity 11 at a position corresponding to the core 20'.

In the resin injection step, the movable mold (2) is advanced toward the cores (20, 20 ', 20 "), the upper mold (10) is joined to the cores (20, 20', 20"), and the partially molded product (P) is inserted into the insert. The molten resin is injected at a high pressure into the unmolded space through the hot nozzle 21 to temporarily mold the product in a state in which the molten resin is not completely filled to the circumference of the molding space.

At this time, the cores 20, 20 'and 20 "are spaced apart from the inner wall surface of the cavity 11 by more than a thickness of a desired product so as not to be pushed backward by the support block 22a. Thus, the hot nozzle 21) The high pressure molten resin injected through 21) is formed in the cavity 11 thicker than the desired thickness of the product, and is not molded to the end shape of the product. Can be prevented from occurring.

In addition, when the product is molded, the molding area is smaller than the total surface area of the desired product, and the molding thickness is relatively thick, so that the solidification is performed on some surfaces in contact with the upper mold 10 and the cores 20, 20 ′, 20 ″. Even if it occurs, the solidified layer is not only small, but also includes a molten resin in a thick caustic molded article so that it can be compression molded smoothly in a later step.

In the compression molding step, as shown in FIG. 2, only the cores 20 and 20 ″ in which the partial molded product P is not disposed among the plurality of cores 20, 20 ′ and 20 ″ are compressed by the compression cylinder 20. 11) presses and advances the resin so that it is pushed to the periphery of the molding space so as to completely mold the product. In this step, since the melted resin needs to be pushed a little more to the circumference by compressing the molded product to some extent, the product is completely molded even though the pressure is significantly reduced compared to the conventional high pressure injection molding method, and the melted resin is partially molded ( It does not seep into the surface of the skin material of P), so the product can be neatly molded.

In addition, the molten resin, which is pushed up to the circumference of the molding space by the compression pressure, is molded into a single product which is connected to the circumference of the partially molded product P pre-arranged in the core 20 ', wherein the portion is When a plurality of grooves H into which the molten resin penetrates into the periphery of the molded product P is formed at predetermined intervals, the grooves H may be melted and solidified by filling the grooves H, thereby forming a more tightly integrated product.

As shown in FIG. 3, the ejection cylinder 25 advances the eject plate 24 when the upper die 10 is separated from the cores 20, 20 ′ and 20 ″ by the movable side template 2, as shown in FIG. 3. By pushing the product by the eject pin 23 mounted on the eject plate 24 is separated from the core (20, 20 ', 20 ").

On the other hand, Figure 4 is a cross-sectional view of the injection molding apparatus showing the appearance of molding the whole product integral, looking at this as follows.

After the upper mold 10 is combined with the cores 20, 20 ', and 20 ", a resin injection step of molding the product by injecting molten resin into the molding space at a high pressure, and each core 20, 20', 20" Pressurized to advance the cavity 11 to the cavity 11 by the compression cylinder 30 to completely mold the product, and extracting the molded product by separating the upper mold 10 from the cores 20, 20 ', and 20 ". The product taking out step is made.

Therefore, in order to mold the product of which the whole is integral, the above-described insert molding method excludes the step of inserting the partially molded article, and the entirety of the cores 20, 20 ′, 20 ″ is compressed by the compression cylinder 30. The product can be injection molded in the same manner as the above-described insert molding method just by pressing forward to the side).

According to the present invention as described above, using a high-pressure injection molding machine as a general-purpose equipment from the product integrally molded to the insert molding of the part skin-covered product that can not be produced by the general injection molding method can be compatible with a variety of products production Can be used. In addition, the injection molding apparatus and method are insert-injected to be firmly integrated even in the case of a product partially covered with skin material, and can significantly reduce the pressure applied to the molten resin during compression molding, thereby preventing post deformation of the product due to residual stress. In addition, the low pressure molding method by the compression operation of the mold itself can prevent the molten resin from seeping out of the skin material, so that the product is clean and the reliability is improved.

1 is a cross-sectional view of the resin injection step by the injection molding apparatus according to the present invention

Figure 2 is a cross-sectional view of the compression molding step by the injection molding apparatus according to the present invention

Figure 3 is a cross-sectional view of the product extraction step by the injection molding apparatus according to the present invention

Figure 4 is a cross-sectional view showing another example of use of the injection molding apparatus according to the present invention

<Description of the symbols for the main parts of the drawings>

10: Pictograph 11: Cavity

20: core 30: pressurized cylinder

Claims (2)

The cores 20, 20 ′, 20 ″ are coupled to the cavity 11 of the upper mold 10 to form a molding space having a predetermined shape between the cavity 11 and the cores 20, 20 ′, 20 ″. In the conventional injection molding apparatus for molding a product by injecting the molten resin at a high pressure through the hot nozzle 21 into the molding space, it is arranged in connection with each other and coupled to the cavity 11 of the upper mold 10 to be integrated. A plurality of cores 20, 20 ', and 20 "forming one molding space, and connected to each of the cores 20, 20', and 20" to selectively select the cores 20, 20 ', and 20 ". A plurality of compression cylinders 30 for pressing forward toward the cavity 11, an eject pin 23 installed to penetrate the cores 20, 20 ', and 20 ", and the eject pin 23 fixedly installed. And an eject plate 24 having an insertion hole 24a formed at a predetermined position, an eject cylinder 25 for advancing the eject plate 24 forward and backward, and connected to the cores 20, 20 ', and 20 ". Eject Plates (24) Is coupled to the insertion hole (24a) of the back and forward and the engaging portion (26a) is formed on the proximal end of the engaging portion engaging the insertion hole (24a) of the rate is formed the core (20, 20 ', 20 ") ) Is an injection molding apparatus, characterized in that it comprises an interlocking pin (26) for advancing together the eject plate (24) when pressing forward toward the cavity (11). A plurality of cores 20 having a predetermined shape of the cavity 11 on one surface and a plurality of cores 20 which are disposed in contact with each other and coupled to the cavity 11 of the upper mold 10 to form an integrated molding space, 20 ', 20 "and a plurality of compression cylinders connected to the respective cores 20, 20', 20" to selectively advance the cores 20, 20 ', 20 "toward the cavity 11 30. An injection molding method for molding a product by inserting a partially molded article P covered with a skin material by an injection molding apparatus having a hot nozzle 21 for spraying molten resin at a high pressure in the molding space. An insert step of separating the upper mold 10 from the cores 20 and 20 'and inserting a partial molded product P in which a skin material is covered on a part of the cores 20' among the plurality of cores 20, 20 'and 20 "; The molten water is injected into the molding space in which the upper mold 10 is joined to the cores 20 and 20 'and the partial molded product P is not inserted. Resin injection step of forming the product without the paper filled to the periphery of the molding space, and only the core (20, 20 ") of the plurality of cores (20, 20 ') that is not partly molded (P) is disposed A compression molding step of compressing the resin injected in the pseudo-molding state to be pushed out to the circumference of the molding space by pressing and advancing toward the cavity 11 of the upper mold 10 by the compression cylinder 30 so as to completely mold the product; Injection molding method comprising a product take-out step of taking out the molded product by separating the upper mold (10) from the core (20,20 ').