KR101448403B1 - Injection molding machine and molding methods using it - Google Patents

Abstract

The present invention relates to a mold clamping device of an injection molding machine and an injection molding method using the same and, more specifically, to a mold clamping device of an injection molding machine to which a mold mounting plate rotates to inject-mold two-color/dissimilar materials, and an injection molding method using the same. The mold clamping device of the injection molding machine includes: a fixated plate on which a fixated mold is disposed; at least two movable plates spaced apart from the fixated plate; a tie bar fixedly disposed on the fixated plate to pass through the movable plate; a movable mold disposed on the movable plate; and a hydraulic system to move the movable plate. The movable plate is disposed on each of both sides of the fixated plate, and the fixated plate is constituted by two parallel fixated supports. The mold mounting plate to mount the fixated mold is disposed between the two fixated supports, and the fixated mold is disposed on each of both surfaces of the mold mounting plate. The fixated supports and the mold mounting plate are shaft-coupled to each other using a shaft, and a hydraulic tube, a cooling water tube, and a wire line are disposed on the mold mounting plate. A rotary connection part through which the hydraulic tube, the cooling water tube, and the wire line are rotatably connected to a connection part is disposed on an end of the shaft. The rotary connection part of the present invention may be constituted by a rotary joint and a swivel connector to prevent the hydraulic tube, the cooling water tube, and the wire line from being twisted when the mold mounting plate rotates.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold clamping apparatus for an injection molding machine and an injection molding method using the same, and more particularly, to a mold clamping apparatus for an injection molding machine using rotation of a mold attaching plate for injection molding of a dichroic .

Injection molding is the most widely used method of manufacturing plastic products for molding plastic products, and various plastic products, including electronic products such as televisions, audios, VCRs, mobile phones, PDAs, and cases, can be manufactured by injection molding.

In general, the production of a product through injection molding is carried out in the following steps. First, a compound made by adding pigments, stabilizers, plasticizers, fillers, etc. to plastic is put into a hopper and heated by heating or high-pressure steam to melt it. Then, the resin liquid is injected into the mold for injection molding through the input portion with the piston, and when the resin liquid is filled in the mold, the resin liquid is cooled and solidified. Subsequently, after the resin liquid in the injection mold is solidified, the resin liquid is extracted from the mold for injection molding, and unnecessary portions are removed from the injection mold to complete the injection product. Injection products manufactured by such injection molding are very diverse in kind and size, and molds for injection molding are required according to the injection products to be produced. The mold for injection molding comprises a fixed metal mold having a cavity, a movable mold having a core, a movable mold coupled to the stationary mold prior to injection of the resin solution, and a cavity sealed and separated from the stationary mold when the resin solution solidifies.

In order to increase the productivity during injection molding, it is necessary to inject the resin liquid into the cavity at a high pressure, circulate the cooling water in the mold, and rapidly cool the molded article to an extractable temperature. Therefore, the mold is in a state in which the temperature is lowered after the injection product is separated. However, when the resin liquid is injected into the mold having a reduced temperature, the resin liquid abruptly cools the cool metal mold and various surface defects are generated in the injection mold. Such surface defects include weld-line, flow mark due to shrinkage of an injection product, lowered fluidity, and the like. In order to reduce the surface defects of such an injection, a method of reducing the temperature difference between the high temperature resin solution and the mold by heating the mold to a predetermined temperature (for example, 150 to 200 DEG C) before the resin solution is injected into the mold has been developed. As a method of heating the mold temperature to a predetermined temperature, a method using steam and a method using an electric heater have been proposed.

Registration No. 10-0991422 relates to an injection molding machine capable of automatic production of double molded articles and a method of manufacturing double molded articles using the same. The object of the present invention is to automatically produce a double molded article in which two or more resins that are not mutually fused are combined, So that it can be maximized. For this purpose, according to the injection molding machine capable of automatic production of the double molded product according to the present invention, A movable body arranged to be movable in a longitudinal direction through a tie bar at an upper portion of the base, the movable body reciprocally moving through the movable unit; A circular rotary plate disposed on one side wall of the movable body so as to be rotatable 360 degrees in a vertical turntable manner; Four lower cores disposed in the circumferential direction so as to be spaced 90 degrees apart from each other at the rotary plate for injection molding the primary molded product forming the exterior of the double molded product; A fixed body mounted on a base upper side and provided with a core mounting wall surface facing the rotary plate; A first cavity disposed on one side of the core mounting wall surface of the stationary mold body and cooperating with a lower core opposed to one side of a core mounting wall surface of the stationary mold body among the lower cores when advancing the movable mold body, A first phase core forming a first phase core; A secondary molded product which is formed on the other side of the core mounting wall surface of the stationary mold so as to be spaced apart from the first upper core by a predetermined distance and which is formed by a lower core opposed to the other side of the core mounting wall face of the stationary mold, A second phase core forming a second cavity for injection molding so as to be integrated with the inner surface of the primary molded product; Rotation driving means for rotating the rotary plate at intervals of 90 degrees when the primary and secondary molded articles are formed and then opened in the lower cores, respectively, wherein the first and second upper cores are opposed to each other; The first and second cores are combined with each other to form the primary molded product and the second upper and lower cores are combined to form the secondary molded product, A marking device for marking a pattern on the inner surface of the primary molded product; . However, the present invention differs from the above-described invention in that it not only makes a difference in the above-described invention and its rotation method, but also prevents a twist phenomenon caused by structural characteristics of a hydraulic pipe, a cooling water pipe and a wire line.

A conventional mold clamping apparatus for an injection molding machine for injection molding of a dichroic material is characterized in that a fixed mold is provided on one surface of a mold mounting plate and a rotating shaft is provided on the opposite surface in a direction parallel to the horizontal surface, . On the other hand, the present invention introduces a rotary method in which all the stationary molds are provided on both surfaces of the mold mounting plate and the rotary shaft is installed in a direction perpendicular to the horizontal plane. However, due to the structural characteristics of the hydraulic pipe, the cooling water pipe, and the wire line inserted into the mold mounting plate through the inside of the shaft when introducing the mold attaching plate rotating method of the present invention, There is a problem.

According to the present invention, there is provided a portable terminal comprising: a stationary plate on which a stationary mold is installed; at least two movable plates spaced apart from the stationary plate; a tie bar fixedly mounted on the stationary plate and passing through the movable plate; A mold clamping apparatus for an injection molding machine comprising a movable mold and a hydraulic system for moving the movable mold,

The movable plate is provided on both sides of the stationary plate,

The fixed plate is composed of two parallel fixed supports,

Wherein a metal mold mounting plate for mounting the stationary mold is provided between the two stationary supports,

A fixed mold is provided on both surfaces of the mold mounting plate,

The fixed support and the metal mounting plate are axially coupled by a shaft,

A hydraulic pipe, a cooling water pipe, and an electric wire line are installed on the mold mounting plate,

And a rotary connection part connected to the hydraulic pipe, the cooling water pipe, and the electric wire line so as to be rotatable at the connection part is installed at the end of the shaft.

The present invention is characterized in that the rotary connection portion is constituted by a rotary joint, a swivel connector, or the like, so as to prevent the twisting phenomenon of the hydraulic pipe, the cooling water pipe and the electric wire line when the mold mounting plate is rotated . In addition, it is easy to cool and take out the mold that has been formed by the hydraulic pipe, the cooling water pipe, and the wire line penetrating the inside of the shaft and inserted into the mold mounting plate.

1 is a sectional view of a conventional injection molding machine mold clamping apparatus.
2 is a sectional view of the injection molding machine mold clamping device of the present invention.
3 is a cross-sectional view of a main portion of an injection molding machine mold clamping apparatus of the present invention.
4 is a perspective view of a rotary joint constituting a rotary connection portion of the present invention;
5 is a perspective view of a swivel connector constituting a rotation connection part of the present invention;
6 is a flow chart of the injection molding method of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold clamping apparatus for an injection molding machine and an injection molding method using the same, and more particularly, to a mold clamping apparatus for an injection molding machine using rotation of a mold attaching plate for injection molding of a dichroic . Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1, a conventional mold clamping apparatus for an injection molding machine for injection molding of a dichroic material is provided with a fixed mold 100 on one side of a mold mounting plate 230 and a rotary shaft And the mold attaching plate 230 is rotated in a direction parallel to the horizontal plane. However, in the present invention, as shown in FIG. 2, the fixed mold 100 is installed on both sides of the mold mounting plate 230 and the rotation axis 240 is installed in a direction perpendicular to the horizontal plane.

In the present invention, the mold attaching plate 230 having the fixed mold 100 mounted on both sides thereof is rotated 180 degrees about a shaft 240 installed in a direction perpendicular to the horizontal plane, and receives a mold clamping force. The mold clamping force refers to the maximum value of the force for clamping the mold and the maximum projectible area that can be formed. Assuming that the average pressure in the mold cavity is P (kg / cm2), the projected area of the cavity is A (cm2), and the mold-clamping force is F (ton)

Equation 1) F? P? A? 10 ^-3

When the condition satisfying the expression 1 is satisfied, the mold is not opened. Therefore, the larger the projection area, the greater the required clamping force.

Therefore, the present invention reduces the projected area by half in comparison with the conventional dichroic injection molding machine shown in FIG. 1, and as a result, the mold clamping force required for molding is reduced by half. In addition, the present invention is advantageous in that uniform mold clamping force can be transmitted to a mold by a center press method. In addition, it is needless to say that the mold clamping device of the injection molding machine of the present invention is not limited to dichromatic materials but can be used as two general molding machines by attaching a universal mold.

However, when the mold mounting plate 230 of the present invention is rotated, as shown in FIG. 3, a hydraulic pipe 231 penetrating the inside of the shaft 240 and inserted into the mold mounting plate 230, Due to the structural characteristics of the tube 232 and the wire line 233, there is a problem that these twists occur during the rotation operation.

2 and 3, the present invention includes a stationary plate 200 on which a stationary mold 100 is installed, two or more movable plates 300 spaced apart from the stationary plate 200, A tie bar 400 fixed to the fixed plate 200 and passing through the movable plate 300, a movable mold 500 installed on the movable plate 300, 1. A mold clamping apparatus for an injection molding machine comprising a hydraulic system,

The movable plate 300 is installed on both sides of the fixed plate 200,

The fixed plate 200 is composed of two parallel fixed supports 210 and 220,

A mold attaching plate 230 for attaching the stationary mold 100 is installed between the two stationary supports 210 and 220,

The fixed mold 100 is installed on both sides of the mold mounting plate 230,

The fixed supports 210 and 220 and the metal mold attaching plate 230 are axially coupled by a shaft 240,

A hydraulic pipe 231, a cooling water pipe 232, and a wire line 233 are installed on the metal mold attaching plate 230,

And a rotation connection part (241) connected to the hydraulic pipe (231), the cooling water pipe (232), and the electric wire line (233) so as to be rotatable at a connection part is provided at a distal end of the shaft (240) Thereby providing a mold clamping apparatus.

The hydraulic pipe 231 is used to facilitate the taking out of a mold completed by using the pressure of the oil flowing through the oil passage. The cooling water pipe 232 is installed to efficiently cool the completed mold And the electric wire line 233 is provided to supply electric power to a part requiring power in the mold clamping apparatus of the injection molding machine of the present invention. 3, the hydraulic pipe 231, the cooling water pipe 232, and the wire line 233 pass through the inside of the shaft 240 and are inserted into the mold mounting plate 230 to be installed therein. Two selected ones of the hydraulic pipe 231, the cooling water pipe 232 and the electric wire 233 are inserted into one shaft 240 and installed symmetrically in the mold attaching plate 230.

The metal mold plate 230 having the hydraulic pipe 231, the cooling water pipe 232 and the electric wire 233 inserted therein is rotated 180 degrees about the shaft 240 supported by the bearing 250.

The rotary connector 241 may be a rotary joint, a swivel connector, or the like as shown in FIGS. 4 and 5, so that when the mold attachment plate 230 rotates, The cooling water pipe 232, and the wire line 233 of the hydraulic pipe 231, the cooling water pipe 232, and the electric wire line 233.

Further, the present invention, as shown in Fig. 6,

A stationary plate 200 on which the stationary mold 100 is installed and two or more movable plates 300 spaced apart from the stationary plate 200. The movable plate 300 fixedly mounted on the stationary plate 200, And a hydraulic system for moving the movable plate 300. The injection molding machine includes a tie bar 400 passing through the movable plate 300, a movable mold 500 installed on the movable plate 300, ,

I) molding material compression and melting step (s1000) for compressing and melting the molding material by screw rotation in the heating cylinder of the injection device;

(II) molding and extracting the molding material by injection-molding with the mold of the molding apparatus (s2000);

/ RTI >

In the step (s2000) of injecting and filling the molding material with a mold of a molding apparatus and forming and taking out the molding material,

I) a first mold closing step (s2100) for moving the movable mold plate (300) to the fixed mold plate (200);

Ii) a primary molding step (s2200) for molding the molding material injected into the mold;

Iii) a first sagging step s2300 for retracting the two moving plates 300;

Iv) rotating the mold mounting plate 230 180 degrees (s2400);

V) a second mold closing step (s2500) for moving the movable mold plate 300 to the fixed mold plate 200;

Vi) a secondary molding step (s2600) for molding the molding material re-injected into the mold;

(Iii) a secondary shedding step s2700 for retracting the movable plate 300;

Wherein:

In the step s2400 of rotating the mold attaching plate 230 by 180 degrees,

Iv-1) a 180-degree rotation step s2410 of the rotation connecting part 241 to which the hydraulic pipe 231, the cooling water pipe 232 and the electric wire line 233 are connected;

The injection molding method of the injection molding machine according to the present invention includes the steps of: It is preferable that the rotation of the mold attaching plate 230 is rotated 180 degrees about the axis 240. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it should be understood that various changes and modifications will be apparent to those skilled in the art. Obviously, the invention is not limited to the embodiments described above. Accordingly, the scope of protection of the present invention should be construed according to the following claims, and all technical ideas which fall within the scope of equivalence by alteration, substitution, substitution, Range. In addition, it should be clarified that some configurations of the drawings are intended to explain the configuration more clearly and are provided in an exaggerated or reduced size than the actual configuration.

100. Fixed mold
200. Fixed plate
210. Fixed support
220. Fixed support
230. Mold mounting plate
231. Hydraulic pipe
232. Cooling water pipe
233. Wire line
240. Axis
241. Rotary connection
250. Bearing
300. Portable version
400. Taiba
500. Moving mold

Claims (12)

A stationary plate 200 on which the stationary mold 100 is installed and two or more movable plates 300 spaced apart from the stationary plate 200. The movable plate 300 fixedly mounted on the stationary plate 200, And a hydraulic system for moving the movable plate (300), the apparatus comprising: a tie bar (400) penetrating through the movable plate (300); a movable mold (500)
The movable plate 300 is installed on both sides of the fixed plate 200,
The fixed plate 200 is composed of two parallel fixed supports 210 and 220,
A mold attaching plate 230 for attaching the stationary mold 100 is installed between the two stationary supports 210 and 220,
The fixed mold 100 is installed on both sides of the mold mounting plate 230,
The fixed supports 210 and 220 and the metal mold attaching plate 230 are axially coupled by a shaft 240,
A hydraulic pipe 231, a cooling water pipe 232, and a wire line 233 are installed on the metal mold attaching plate 230,
And a rotation connection part (241) connected to the hydraulic pipe (231), the cooling water pipe (232), and the electric wire line (233) so as to be rotatable at a connection part is provided at a distal end of the shaft (240) Shaped device.
The method according to claim 1,
Wherein the hydraulic pipe (231), the cooling water pipe (232) and the wire line (233) penetrate the shaft (240) and are inserted into the mold mounting plate (230).
3. The method of claim 2,
Wherein one of the hydraulic pipe (231), the cooling water pipe (232), and the wire line (233) is inserted into one shaft (240).
The method of claim 3,
Wherein a selected one of the hydraulic pipe (231), the cooling water pipe (232), and the electric wire (233) inserted into the one shaft (240) is symmetrically installed in the mold attaching plate (230) .
The method according to claim 1,
And a bearing (250) is installed on the shaft (240).
The method according to claim 1,
Wherein the mold attaching plate (230) is rotated 180 degrees around the shaft (240).
The method according to claim 1,
Wherein the rotary connection part (241) is a rotary joint.
The method according to claim 1,
Wherein the rotation connection part (241) is a swivel connector.
A stationary plate 200 on which the stationary mold 100 is installed and two or more movable plates 300 spaced apart from the stationary plate 200. The movable plate 300 fixedly mounted on the stationary plate 200, And a hydraulic system for moving the movable plate 300. The injection molding machine includes a tie bar 400 passing through the movable plate 300, a movable mold 500 installed on the movable plate 300,
An injection molding machine comprising the mold clamping apparatus according to any one of claims 1 to 8.
A stationary plate 200 on which the stationary mold 100 is installed and two or more movable plates 300 spaced apart from the stationary plate 200. The movable plate 300 fixedly mounted on the stationary plate 200, And a hydraulic system for moving the movable plate 300. The injection molding machine includes a tie bar 400 passing through the movable plate 300, a movable mold 500 installed on the movable plate 300, ,
I) molding material compression and melting step (s1000) for compressing and melting the molding material by screw rotation in the heating cylinder of the injection device;
(II) molding and extracting the molding material by injection-molding with the mold of the molding apparatus (s2000);
/ RTI >
In the step (s2000) of injecting and filling the molding material with a mold and forming and taking out the molding material,
I) a first mold closing step (s2100) for moving the movable mold plate (300) to the fixed mold plate (200);
Ii) a primary molding step (s2200) for molding the molding material injected into the mold;
Iii) a first sagging step s2300 for retracting the two moving plates 300;
Iv) rotating the mold mounting plate 230 180 degrees (s2400);
V) a second mold closing step (s2500) for moving the movable mold plate 300 to the fixed mold plate 200;
Vi) a secondary molding step (s2600) for molding the molding material re-injected into the mold;
(Iii) a secondary shedding step s2700 for retracting the movable plate 300;
Wherein:
In the step s2400 of rotating the mold attaching plate 230 by 180 degrees,
Iv-1) a 180-degree rotation step s2410 of the rotation connecting portion 241 to which the hydraulic pipe 231, the cooling water pipe 232 and the electric wire line 233 are connected;
Wherein the injection molding machine comprises a plurality of injection molding machines.
11. The method of claim 10,
Wherein the mold mounting plate (230) is rotated by 180 degrees about a shaft (240) in a 180 degree rotation step (2400).
A stationary plate 200 on which the stationary mold 100 is installed and two or more movable plates 300 spaced apart from the stationary plate 200. The movable plate 300 fixedly mounted on the stationary plate 200, And a hydraulic system for moving the movable plate 300. The injection molding machine includes a tie bar 400 passing through the movable plate 300, a movable mold 500 installed on the movable plate 300,
The injection molding machine according to any one of claims 10 to 11, wherein the injection molding machine is an injection molding machine.

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