KR20130062121A - Mehtod of injection and molding in rotary type vertical injection molding machine and rotary type vertical injection molding machine thereof - Google Patents

Abstract

PURPOSE: A rotary vertical injection molding machine and a method for injecting and painting using the same are provided to prevent paint from sagging on the surface of a product and to manufacture a high quality of an injection molded product by separately performing an injecting process and a painting process in a mold by rotating a transfer plate. CONSTITUTION: A rotary vertical injection molding machine comprises a vertical injection machine, a fixing plate, a pair of mold lower plates, a rotatable transfer plate, and a paint injecting valve. The pair of mold lower plates includes a mold B1 for an injecting process and a mold B2 for a painting process. After a mold A and the mold B1 are demolished, an injection molded product in which resin is injected is formed to comprise tunnel type burr. The paint injecting valve includes a protrusion to combine with the tunnel type burr. [Reference numerals] (AA) Injector; (BB) Fixed plate; (CC) Mold upper plate(Mold A); (DD) Mold lower plate 1(Mold B); (EE) Mold lower plate 2(Mold C); (FF) Paint injecting valve; (GG) Moving plate; (HH) Control unit; (II) Temperature control unit; (JJ) Ink injector

Description

Injection and painting process using a rotary vertical injection molding machine and its vertical injection molding machine TECHNICAL FIELD

The present invention relates to an injection molding and painting process, and an injection molding machine.

Injection molding refers to a technique of manufacturing a desired shape by injecting molten plastic resin into a cavity of a closed mold as one of plastic molding processing methods.

In general, during the production process of plastic products used in the housing of electronic products, the product is moved to the production line for painting separately after injection molding in order to conceal defects in appearance during the injection process, to realize color, and to improve surface quality. For injection molded products, the product is produced by adding spray coating processes such as masking and annealing for painting. However, when the product is subjected to the above-described process, that is, packaging, moving, and producing process of the product, an increase in production cost occurs due to an increase in the defective rate. In addition, the injection molded molding is subjected to a process of painting paints as desired by the user, including paint, in which case the spray coating process uses toxic solvents when the injection process and the painting process are not integrated. There is a problem in that it has a harmful effect on the process worker.

1 and 2 illustrate an injection molding process and a coating process (ie, painting a paint).

1 is a view showing a conventional process of separately processing an injection process and a painting process. That is, as shown in Figure 1, Figure 1 is a method of injecting a resin (resin) to the mold mold and injection molding, and then moving the production line to coat the injection molding using a spray. The prior art of FIG. 1 has a disadvantage in that the injection molding process and the painting process are performed separately, thereby increasing the manufacturing time and manufacturing cost of the final finished product.

Figure 2 is a prior art, it is a view showing a method in which the injection molding process is integrated. As shown in FIG. 2, as a process without moving the production line, resin is injected through a horizontal injection hole to perform an injection molding process (ie, resin injection). And, instead of performing a coating operation to separate and coat the injection-molded injection, Figure 2 is to integrate the injection molding process and the painting process by injecting the paint through the paint inlet. The prior art of FIG. 2 has technical limitations in that it is difficult to realize a high gloss product surface because coating sagging may occur in a coating process (ie, a painting process).

SUMMARY OF THE INVENTION An object of the present invention is to overcome the technical limitations as described above, and to provide a method and an injection molding machine for injection molding and coating that can produce a product having a high gloss surface by preventing paint sagging on the product surface.

In order to achieve the above object, the rotary vertical injection molding machine according to the present invention,

A vertical injection machine for driving vertically and injecting resin into the mold;

A fixed plate on which the mold top plate is mounted;

A pair of mold lower plates are mounted, and a rotatable movable plate, wherein the pair of mold lower plates comprises a mold lower plate 1 for an injection process and a mold lower plate 2 for a painting process;

Includes; and a paint injection valve connected to the mold lower plate 2 for the painting process, and injects paint

The mold upper plate and the mold lower plate 1 are mold-closed, and then the injection molded resin is formed to form a tunnel type extremity.

The paint injection valve is characterized in that the projection is configured for coupling with the tunnel type glands.

Preferably, the paint injection valve is characterized in that the sealing pin pin further controls the amount of paint to be injected when the paint is injected into the mold lower plate 2 for the painting process, and further prevents leakage. .

Preferably, the temperature control unit for controlling the temperature of the mold upper plate and the pair of mold lower plate; And an ink injector for injecting paint into the paint injection valve.

Preferably, the mold upper plate is controlled to be closed with the mold lower plate 1, and after the injection process of injecting resin during mold closing between the mold upper plate and the lower plate 1, the coating between the upper plate and the lower plate 2 is carried out. For the process, by rotating the moving plate, the control unit for moving the mold lower plate 2 to the position that can be combined with the mold upper plate; characterized in that it further comprises.

In addition, in order to achieve the above object, the injection and painting process method in the rotary vertical injection molding machine according to the present invention,

(a) forming a mold upper plate and a mold lower plate 1 for the resin injection process;

(b) injecting a resin into a cavity between the mold closed top plate and the bottom plate 1 to form an injection molded product, wherein the injection molded material is formed with a tunnel-shaped extrudate;

(c) cooling the injected injection-molded product, and opening the mold closed upper mold plate and the lower mold lower plate 1;

(d) rotating the moving plate to move the mold lower plate 2 to a position capable of engaging with the mold upper plate;

(e) mold closing the mold upper plate and the mold lower plate 2;

(f) coating the injection molding by injecting paint by combining the projection of the injection valve with the tunnel injection of the injection molding in the state where the mold upper plate and the mold lower plate 2 are closed;

(g) after completing the coating on the injection molded product, opening the upper mold plate and the lower mold plate 2;

Preferably, in the step (f)

It is characterized in that it further comprises the step of controlling the sealing pin configured in the paint injection valve, adjusting the injection amount of the paint and preventing leakage of the paint.

Preferably, the mold lower plate 1 is for an injection process,

The mold lower plate 2 is for a painting process,

The mold lower plate 1 and the mold lower plate 2 are mounted on the moving plate,

The moving plate is characterized in that it moves to a position that can be combined with the mold upper plate as the rotary movement.

The present invention is configured separately from the mold lower plate for the injection process and the mold lower plate for the painting process, when switching from the injection process to the painting process, by rotating the moving plate to perform the injection process and the painting process in the mold separately, the paint in the painting process It can prevent agglomeration and produce high quality injection molded products (ie injection moldings).

1 illustrates a prior art in which an injection molding process and a coating process are separately performed.
Figure 2 shows the prior art performed by integrating the injection molding process and the coating process.
Figure 3 is an embodiment of the present invention, a plan view of a rotary vertical injection molding machine according to the present invention.
Figure 4 is an embodiment of the present invention, is a view of the dummy (dummy) is coupled to the paint injection valve and formed in the injection molding.
5 is a view illustrating a structure of a paint injection valve of a rotary vertical injection molding machine according to an embodiment of the present invention.
Figure 6 is an embodiment of the present invention, it is an example in which the addition of Figure 4 and the paint injection valve of Figure 5 is fastened.
7 is a flowchart illustrating a method of integrating an injection process and a painting process by a rotary vertical injection molding machine according to an embodiment of the present invention.

The present invention is applied to an injection molding machine and an injection molding and painting process. However, the present invention is not limited thereto and can be applied to all related arts to which the technical idea of the present invention can be applied.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed yields.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

The basic concept of the present invention is: 1) by integrating the injection molding process and the painting process; 2) in particular, a mold mold (aka mold) for resin injection and a mold mold for painting are separately provided; 3) closing the mold top plate (eg mold A) and mold bottom plate 1 (eg mold B1) and then injecting the resin; 4) After rotating a moving plate equipped with a pair of mold lower pieces, close the mold upper plate (for example, mold A) and the mold lower plate 2 (for example, mold B2), By performing a painting process using a paint injection valve having a taper-type sealing pin, it is possible to prevent a paint lumping phenomenon that may be caused in the painting process.

Figure 3 is an embodiment of the present invention, a plan view of a rotary vertical injection molding machine according to the present invention.

As shown in Fig. 3, an injection machine for driving vertically and injecting resin (for example, resin is a thermoplastic material such as PC, PMMA, PPA, ABS, PC / ABS, etc.) into a mold; A fixing plate on which a mold top plate (for example mold A) is mounted; A pair of mold lower plates (for example, mold B1 and mold B2) are mounted, and a rotatable movable plate, wherein the pair of mold lower plates are the mold lower plate 1 for injection process (that is, mold B1) and the mold lower plate 3 for painting process. (Ie, mold B2); It is configured to include a temperature control unit for temperature control the mold upper plate and the pair of mold lower plates.

In addition, the rotary vertical injection molding machine according to the present invention further comprises a paint injection valve for injecting the paint to the mold lower plate 2 (ie, mold B2) for the coating process, wherein the paint injection valve is the inner side of the valve and And a sealing pin of surface contact.

In addition, the rotary vertical injection molding machine according to the present invention further comprises an ink injector for injecting paint into the paint injection valve.

In addition, the rotary vertical injection molding machine according to the present invention, in the process of injecting the resin by closing the mold upper plate 1 and lower mold 1 (ie, mold B1), the resin-injected product tunnel tunneling as shown in FIG. It is a characteristic that the paint injection hole of (dummy) is formed. On the other hand, the tunnel type gush of FIG. 4 serves as a guide function to inject paint during the painting process, and is removed from the injection molding after the painting process is completed.

5 is a view illustrating a structure of a paint injection valve according to an embodiment of the present invention. As shown in Fig. 5, the paint inlet valve may have a purchase inlet (or inlet) of the paint inlet valve to form an inclined surface, and protrusions may be formed on the inclined surface, or the paint inlet valve may be formed in a straight section as shown in FIG. You may. That is, the shape of the paint injection valve of the present invention can be carried out in various ways depending on the application.

As shown in FIG. 5, the paint injection valve of the present invention has a structure for preventing the leakage of paint and sealing the injection portion, and is characterized by having a conical protrusion and a sealing pin. In Fig. 5, the conical projection is coupled to a tunnel type dummy (i.e., tunnel type extinguisher of Fig. 4) formed on one surface of the product which is the result (i.e., the injection product) by the resin injection process, so that the paint is applied to the injection molding. When the paint is injected for the process, it provides a function of bringing the paint injection valve into close contact with the tunnel type so that the paint does not leak. In particular, the tunnel type extruding enables continuous injection molding since it prevents the curable or uncured coating material from adsorbing to the mold when injecting the coating material for coating through the extruding. In other words, as shown in FIG. 6, the tunnel type gush of FIG. 4 is tightly coupled to the paint injection valve of FIG. 5. In particular, since the paint inlet of FIG. 4 is tunnel type (that is, circular), the projection of the paint injection valve of FIG. 5 can be fastened to be in close contact with the paint inlet of FIG. 4. In addition, as shown in FIG. 6, since the paint injection valve of FIG. 5 is tightly coupled to the brushing of FIG. 4, leakage of the paint may be prevented during the coating process of injecting the paint into the injection molding.

Meanwhile, as shown in FIG. 5, the sealing pin in the paint injection valve is formed inside the paint injection valve, and has a tapered pin structure that can move forward or backward under the control of a controller. . In particular, the sealing pin can be adjusted forward or backward by the control of the controller, thereby adjusting the injection amount of the paint. In addition, when the sealing pin is moved backward by the control of the control unit, the paint is injected into the injection molding, and on the contrary, when the sealing pin is moved forward (i.e., moves toward the projection inlet), the paint injection valve is closed ( close), to seal the paint in the paint injection valve so as not to leak.

7 is a flowchart illustrating a method of integrating an injection process and a painting process by a rotary vertical injection molding machine according to an embodiment of the present invention.

The controller controls the vertical injection machine equipped with the upper mold plate (ie, mold A) to move downward, and engages with the lower mold plate 1 (ie, mold B) (S71). That is, the mold upper plate mounted on the fixed plate is moved to the mold lower plate, so that the mold upper plate and the mold lower plate 1 are coupled to each other (called mold closing). At this time, the mold lower plate 1 corresponds to a mold used for resin injection purposes.

The control unit controls the vertical injection machine to allow the primary resin to be injected into the gap between the mold upper plate and the lower plate 1 that are currently closed, that is, the cavity (S72). After the S72 process is completed, a resin cooling process is performed to form an injection molding. On the other hand, in the process of S72, the resin is injected product is composed of a tunnel type gush shown in FIG. This brushing is performed in the coating process, the coating is injected into the guide function, and after the injection process and the painting process is completed is removed from the injection.

The control unit moves the vertical injection machine to open the mold upper plate and the mold lower plate 1, which are closed (called mold opening) (S73). At this time, the product in which the resin is injected (that is, the injected product) is in a state of being attached to the upper mold plate.

The control unit rotates the moving plate to move the mold lower plate 2 (ie, mold C) to a position where the mold upper plate (ie, mold A) can engage. Rotate the lower plate of the mold mounted on the moving plate (S74).

The control unit moves the mold upper plate to mold-close the mold upper plate (ie, mold A) and the mold lower plate 2 (ie, mold C) (S75). The control unit controls the projection of the paint injection valve to engage with the tunnel-shaped extremity formed in the injection molded product in S72 and injects paint into the injection through the paint injection valve in the ink injector, thereby painting the injection molded product. (S76). In the step S76, by controlling the tapered sealing pin in the paint injection valve, the injection amount of the paint is adjusted, the leakage of the paint is prevented.

When the coating process of S76 is completed, the control unit moves the mold upper plate to mold the mold upper plate and the mold lower plate 2 (S77).

As described above, when the injection process and the painting process is completed through the process S71 to S77, the control unit separates the finished product from the mold top plate.

On the other hand, the method according to the invention described so far may be implemented in software, hardware, or a combination thereof. For example, a method in accordance with the present invention may be stored in a storage medium (e.g., mobile terminal internal memory, flash memory, hard disk, etc.) ≪ / RTI > in a software program that can be executed by a computer.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (7)

A vertical injection machine for driving vertically and injecting resin into the mold;
A fixed plate on which the mold top plate is mounted;
A pair of mold lower plates are mounted, and a rotatable movable plate, wherein the pair of mold lower plates comprises a mold lower plate 1 for an injection process and a mold lower plate 2 for a painting process;
Includes; and a paint injection valve connected to the mold lower plate 2 for the painting process, and injects paint
The mold upper plate and the mold lower plate 1 are mold-closed, and then the injection molded resin is formed to form a tunnel type extremity.
The paint injection valve is a rotary vertical injection molding machine, characterized in that the projection is configured for coupling with the tunnel type tooth. According to claim 1, wherein the paint injection valve
Rotating vertical injection molding machine characterized in that when the paint is injected into the lower plate 2 for the painting process, a sealing pin pin is further configured to adjust the amount of the injected paint and prevent leakage. The method of claim 1,
A temperature controller for controlling the temperature of the mold upper plate and the pair of mold lower plates;
And an ink injector for injecting paint into the paint injection valve. The method of claim 1,
The mold upper plate is moved and controlled to be closed with the mold lower plate 1,
After the injection process of injecting resin during mold closing between the mold upper plate and the lower mold lower plate 1, the moving plate is rotated for the coating process between the upper mold plate and the lower mold plate 2, and the lower mold plate 2 is connected to the upper mold plate. And a control unit for moving to a position that can be coupled to the rotary vertical injection molding machine. (a) forming a mold upper plate and a mold lower plate 1 for the resin injection process;
(b) injecting a resin into a cavity between the mold closed top plate and the bottom plate 1 to form an injection molded product, wherein the injection molded material is formed with a tunnel-shaped extrudate;
(c) cooling the injected injection-molded product and opening the mold closed upper plate and the lower mold 1;
(d) rotating the moving plate to move the mold lower plate 2 to a position capable of engaging with the mold upper plate;
(e) mold closing the mold upper plate and the mold lower plate 2;
(f) coating the injection molding by injecting paint by combining the projection of the injection valve with the tunnel injection of the injection molding in the state where the mold upper plate and the mold lower plate 2 are closed;
(g) after completing the coating on the injection molding, the step of opening the mold upper plate and the mold lower plate 2; injection and painting process method in a vertical rotary injection molding machine comprising a. The method of claim 5, wherein in step (f)
Controlling the sealing pin configured in the paint injection valve, adjusting the injection amount of the paint and preventing the leakage of the paint injection and painting process method in the vertical injection molding machine further comprising. The method of claim 6, wherein the mold lower plate 1 is for an injection process,
The mold lower plate 2 is for a painting process,
The mold lower plate 1 and the mold lower plate 2 are mounted on the moving plate,
Injection and painting process method in a vertical rotary injection molding machine, characterized in that for moving to the position that can be combined with the mold upper plate as the movable plate is rotated.

Images