KR101418246B1 - Overflow Suctioning Mold for Casting - Google Patents

Abstract

The present invention relates to a vacuum forming mold having a multiple coupling mold unit for vacuum suction and, more specifically, to a vacuum forming mold having a multiple coupling mold unit for vacuum suction. The mold includes mold cores (20, 20′) forming a cavity (10) for molding a product, and mold disks (30, 30′) on which the mold cores (20, 20′) are mounted. The mold includes a multiple coupling suction mold unit (110) which is inserted into one or more suction mold unit insertion portions (40) formed in the mold cores (20, 20′) to be mounted to the suction mold unit insertion portions such that the suction mold unit insertion portions communicate with a suction passage (50) formed in the mold disks (30, 30′). The multiple coupling suction mold unit (110) includes: two or more coupling suction mold plates (111) coupled to each other, having one side surface with a mold surface (112) forming a part of the shape of the cavity (10), and a suction slit groove (113) sucking gas from the mold surface (112); and a suction spacer (117) with a suction spacer through hole (117a) delivering the gas sucked through the suction slit groove (113) to the suction passage (50) formed in the mold disks (30, 30′). Therefore, the gas in the cavity (10) can be sucked by a vacuum suction means (not shown) connected to the suction passage (50) at a predetermined time earlier than time to input melting solution.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold for vacuum molding,

The present invention relates to a molded vacuum mold having a multiple-engagement mold for vacuum suction, comprising a mold core (20, 20 ') for forming a cavity (10) for molding a product, , The mold core (20, 20 ') communicating with the intake passage (50) formed in the mold disc (30, 30') is provided with a mold disc A plurality of coupled intake mold portions 110 inserted into and inserted into at least one intake mold portion inserting portion 40; Wherein the cavity is formed by joining two or more of the multiple combined intake metal mold parts 110, and a molding surface (not shown) which forms a part of the shape of the cavity 10 (111) formed with an intake slit groove (113) for sucking gas from the molding surface (112), and a gas suction member An intake spacer 117 formed with an intake spacer through hole 117a for transmitting the intake air to the intake passage 50 formed in the mold base plate 30 or 30 '; Wherein the gas in the cavity (10) is sucked by the vacuum intake means (not shown) connected to the intake passage (50) a predetermined time before the injection of the molten liquid And a multiple vacuum mold for vacuum suction.

In the case where a resin such as plastic or vinyl is conventionally molded by using a mold, the resin melt flows into the cavity formed in the shape of the product inside the mold, Burrs are formed on the surface of the product due to the infiltration of the resin melt on the joint surface, which results in a problem that the quality of the product is lowered and post-processing of products for removing burrs is required.

In addition, when a product is molded using a resin melt having a high-viscosity or high-viscosity characteristics, the rate of curing of the resin is faster than the rate of injection of the resin melt, resulting in unformed portions or inability to form elaborate portions There was a problem.

On the other hand, when the resin melt is injected into the mold, the gas generated in the resin melt is caught in the cavity of the mold. The generation of such gas is caused not only by the above- There is a problem that the embossing shape is formed on the surface to deteriorate the quality of the product. In the case of a resin melt such as PPS which is widely used due to its excellent anti-property properties, since the generated gas contains a sulfur component, the metal mold is corroded to remarkably reduce the life of the mold .

In order to solve such a problem, in a "mold having a vacuum molding structure" (Korean Utility Model No. 20-0219668) disclosed in Patent Document 1, a heat insulating plate, a top plate, a runner stripper plate, a top plate, a bottom plate, An operating means which is assembled in the order of a leg, a top plate, an insulating plate, etc., and a mold structure including an outer periphery of a mold with a base plate, a core mounted on the upper plate and the lower plate, and a plate coupled to the plate base A rubber ring for sealing the inner space of the mold is attached to the assembly connection portion of the heat insulating plate, the upper fixing plate, the runner stripper plate, the upper plate, the lower plate, the pedestal, the leg, the upper plate, , A gas for forming a mold inside of the mold including the inner space of the core forming the shape of the injection mold when the molten resin is injected into one side of the bed, The configuration, characterized in that the grant of the vacuum suction means, the device group have been disclosed.

However, although the conventional design provides a structure for sucking gas generated during molding, since the gas suction in the cavity portion in which the product is molded in the closed mold is performed entirely along the joint surface between the cores, The problem of burrs on the surface of the substrate remains.

On the other hand, in order to solve the above-mentioned problem, in the "apparatus for degassing a mold for injection molding" (Korean Utility Model Publication No. 2000-0003608), a cavity for filling a molten resin And a core having the same shape as that of the molded article is coupled to the movable mold, wherein the mold is passed through a through hole formed in the movable mold and is inserted into a fixing groove formed in the core A lock which is inserted in a lock portion formed at the center of the actuating pin and is blocked by the bottom surface of the movable mold so as to actuate the actuating pin only for a predetermined distance, and a spring inserted in the fixing hole, And the like. However, in this case as well, since the suction of the gas is made in the cavity portion of the core constituting the shape of the product, there is a problem that the burr generated in the portion for sucking gas remains on the surface of the product as it is.

Patent Document 1: Korean Utility Model Registration No. 20-0219668 Patent Document 2: Korean Utility Model No. 20-2000-0003608

The present invention solves the above problems of the prior art and forms a product by injecting a melt after making the inside of the mold close to a vacuum, so that even if the melt is highly viscous, the melt can be efficiently and rapidly The injection speed is much faster than the hardening speed because it is drawn into the inside of the metal mold. Thus, it is possible to efficiently form a shape having a fine structure, and to achieve higher quality product molding.

It is another object of the present invention to prevent generation of burrs on the surface of a product when a gas is sucked in a mold part constituting the surface of the product.

In addition, in the case of molding using a resin containing a corrosive gas component such as a sulfur component such as PPS resin, it is possible to prevent the corrosion of the mold by rapidly sucking and removing the corrosive gas, thereby prolonging the life of the mold We do thing as problem.

According to an aspect of the present invention, there is provided a mold comprising: a mold core for forming a cavity for molding a product; a mold base plate on which the mold core is mounted; Wherein at least one intake mold insert part (30) is formed in the mold core (20, 20 ') so as to communicate with an intake passage (50) formed in the mold base plate (30, 30' A plurality of coupled intake metal mold parts 110 inserted into and inserted into the plurality of intake camshafts 40; Wherein the cavity is formed by joining two or more of the multiple combined intake metal mold parts 110, and a molding surface (not shown) which forms a part of the shape of the cavity 10 (111) formed with an intake slit groove (113) for sucking gas from the molding surface (112), and a gas suction member An intake spacer 117 formed with an intake spacer through hole 117a for transmitting the intake air to the intake passage 50 formed in the mold base plate 30 or 30 '; (Not shown) connected to the intake passage 50 to suck the gas in the cavity 10 before a predetermined time before the molten liquid is injected into the cavity 10 .

An engaging hole 114 formed in the engaging intake mold plate 111 so that the fixing means 119 can pass through the engaging intake mold plate 111 while being fixed to each other;

A lower connection slit groove 111 formed on the other side surface of the combined intake mold plate 111 and processed to allow the intake slit grooves 113 to communicate with each other when the respective combined intake mold plates 111 are coupled to each other, (116); And further comprising:

The apparatus further includes an intake mold mounting housing 118 formed with a mounting housing through hole 118a to which the combined intake mold plate 111 is inserted and fixed while being coupled with two or more and,

The intake spacer 117 is inserted into the mounting hole 118a.

In addition, in the multiple coupled intake metal mold part 110,

And a breathable intake metal mold 120 constituting a part of the shape of the cavity 10 and made of a breathable material is further coupled.

The ventilation intake mold 120 further includes a mounting groove 120a formed on the coupling side of the air intake mold 120 to the multiple combined intake mold 110 and a through hole 120b further formed in the air intake mold 120 And a ventilation inlet core (122) formed of a material having greater air permeability than the ventilation intake mold (120) and having a breathable intake hole (122) communicating with the intake slit groove (113) 121), a breathable intake mold mounting portion (118b) further formed to be detachably mounted on the mounting groove portion (120a) in the intake mold mounting housing (118); And further comprising:

According to the present invention, since the inside of a mold is made to be in a state close to a vacuum, and a product is molded by injection of a melt, even if the melt has a high viscosity, the melt is efficiently drawn into the mold by the vacuum suction force The injection speed is much faster than the curing speed, so that it is possible to efficiently form a shape having a fine structure, thereby enabling molding of a higher quality product.

Further, there is an advantage that it is possible to prevent a burr from being generated on the surface of a product when a gas is sucked from a mold part constituting the surface of the product.

In addition, in the case of molding using a resin containing a corrosive gas component such as a sulfur component such as PPS resin, it is possible to prevent the corrosion of the mold by rapidly sucking and removing the corrosive gas, thereby prolonging the life of the mold .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the entire configuration of a molded vacuum mold having a multiple-engagement metal mold for vacuum suction according to an embodiment of the present invention; Fig.
2 is a view showing a configuration of a main part of a molded vacuum mold having a multiple-engagement metal mold for vacuum suction according to an embodiment of the present invention;
3 is a view showing a configuration of a multiple-coupled mold part of a molded vacuum mold having a multiple-coupled mold part for vacuum suction according to an embodiment of the present invention.
Fig. 4 is a view showing the entire configuration of a molding vacuum mold having a multiple-engagement mold part for vacuum suction according to an embodiment of the present invention; Fig.
Fig. 5 is a view showing the entire configuration of a molding vacuum mold having a multiple-engagement metal mold for vacuum suction; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the accompanying drawings, a molding vacuum mold having a multiple engagement metal mold for vacuum suction according to an embodiment of the present invention will be described in detail. First, it should be noted that, in the drawings, the same components or parts are denoted by the same reference numerals whenever possible. In describing the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as not to obscure the subject matter of the present invention

As shown in FIG. 1, a molding vacuum mold having a multiple-coupling mold part for vacuum suction according to the present invention includes a mold core 20, 20 'for forming a cavity 10 for molding a product, (30, 30 ', 30', 30 ', 30', 30 ', 30', 30 ' And a plurality of coupled intake mold portions 110 inserted into and inserted into one or more intake mold portion insertion portions 40 formed in the cores 20 and 20 '.

Here, the contents of the mold cores 20, 20 'and the mold discs 30, 30', 30 "are well known and used in the technical field of the present invention, Is omitted.

As shown in FIG. 3, the multiple coupled intake mold portions 110 are formed by joining two or more of them, and a molding surface 112 constituting a part of the shape of the cavity 10 is formed on one side thereof . As shown in FIG. 4, the multiple coupled intake mold portion 110 includes a coupled intake mold plate 111 having an intake slit groove 113 for sucking gas from the molding surface 112, As shown in FIG. 3, an intake spacer (not shown) having an intake spacer through-hole 117a for transmitting the gas sucked from the intake slit groove 113 to the intake passage 50 formed in the mold disc 30, 30 ' 117).

Here, the depth of the intake slit groove 113 is determined by considering the physical properties such as the viscosity and the surface tension of the resin or metal used for injection molding, and the shape of the cavity 10, It is preferable to determine the depth of the slit groove 113 to such an extent that no resin or metal used for injection molding is introduced.

In this case, as shown in FIG. 3 and FIG. 4, the combined intake and exhaust metal mold plates 111 are provided with fixing means 119 so that the combined intake and exhaust metal molds 111 can be fixed in a state of being coupled to each other It is preferable that one or more coupling holes 114 are formed. As shown in FIGS. 3 and 4, the coupled intake mold plate 111 is formed on the other side surface of the combined intake mold plate 111, and the respective combined intake mold plates 111 are coupled to each other It is preferable that the lower connection slit grooves 116 are further processed so that the inlet slit grooves 113 can communicate with each other.

3, in order to make it possible to firmly mount two or more combined intake and exhaust metal molds 111, the multiple intake and exhaust intake molds 110 are connected to the combined intake and exhaust molds And an intake mold mounting housing 118 having a mounting hole 118a formed therein to be inserted and fixed in a state where two or more of the mounting hole holes 111 are coupled with each other. In this case, the intake spacer 117 is preferably inserted into the mounting hole 118a.

As shown in FIG. 4, in the multiple combined intake mold section 110 constituted by the combined intake and exhaust mold plates 111 formed by joining two or more together, a large number The intake slit grooves 113 formed on the outer circumferential surface of the intake manifold 113 can achieve extremely efficient intake.

As shown in FIGS. 2 and 5, the multiple combined intake metal mold part 110 further includes a breathable intake metal mold 120 constituting a part of the shape of the cavity 10 and made of a breathable material . In this case, it is possible to implement various embodiments in which the breathable intake metal mold 120 is further coupled to the multiple combined intake metal mold part 110. In one embodiment, as shown in FIG. 5, A mounting groove portion 120a further formed on the coupling side of the breathable intake metal mold 120 with respect to the multiple combined intake metal mold portion 110 and a mounting groove portion 120b which is detachably mountable to the mounting cavity portion 120a in the intake mold mounting housing 118 A ventilation intake mold mounting portion 118b which is further formed to be mounted; And further comprising:

In this case, the breathable intake metal mold 120 can efficiently intake air in consideration of physical characteristics such as the viscosity of the resin or metal used for injection molding, surface tension, and the shape of the cavity 10, 120 are made of a material having a through hole of a size such that a resin used for injection molding or a metal is not introduced. As such a material, it is preferable to use a material capable of sufficiently ensuring the durability against the temperature and mechanical pressure of the injection molding process while having holes such as porous ceramics and metal powder composites.

Since the breathable intake metal mold 120 is made of a material having a through hole of a size that does not allow injection of resin or metal used for injection molding, the size of the through hole is extremely small. Therefore, There is a limit. 5, the breathable intake metal mold 120 is inserted into the through hole 120b, which is further formed in the breathable intake metal mold 120, and is mounted in the ventilation intake metal mold 120, And a breathable air intake core 121 formed of a material having a larger air permeability than the air inlet slit groove 120 and having a breathable intake air hole 122 communicating with the intake slit groove 113 .

Meanwhile, as shown in FIG. 1, the multiple combined intake metal mold part 110 and the breathable intake metal mold 120 may be selectively installed at various positions in the cavity 10. In this case, the multiple combined intake mold part 110 is installed at a position where a relatively high shape precision is required in consideration of a feature that the molding surface 112 can be processed into a precise shape, It is preferable to install it at a position where a shape accuracy is not required to a great extent or at a position where a large amount of gas should be sucked in consideration of a characteristic that suction is possible through the entire surface thereof.

In the operation of the molding vacuum mold having the multiple engagement metal mold part for vacuum suction according to an embodiment of the present invention, vacuum intake means (not shown) connected to the intake passage 50 before the injection of the molten metal, It is possible to lower the molding pressure and efficiently suck and discharge the gas generated in the molding process. In this case, the predetermined time for starting the suction operation prior to the injection of the molten liquid is determined by the physical properties such as the viscosity and surface tension of the resin or metal used in the injection molding, the shape of the cavity 10, It is preferable to determine it in consideration of the conditions.

In the foregoing, optimal embodiments have been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Cavity
20, 20 ': mold core
30,30 ': mold disc
40: intake mold part inserting part
50: intake passage 60: vacuum connector
100: a molding vacuum mold having a multiple engagement mold part for vacuum suction
110: multiple coupled intake metal mold part
111: combined intake mold plate 112: molding surface
113: intake slit groove 114: engaging hole
115: step portion 116: lower connection slit groove
117: Intake spacer 117a: Intake spacer opening
118: intake mold mounting housing 118a: mounting housing through hole
118b: breathable intake mold mounting portion 119: fixing means
120: breathable intake mold
120a: mounting groove portion 120b: through hole
121: breathable intake core 122: breathable intake air vent
123: Breathable intake mold mounting housing

Claims (5)

A mold comprising a mold core (20, 20 ') for forming a cavity (10) for molding a product and a mold disc (30, 30') on which the mold core (20, 20 ' ,
A plurality of combined intake and exhaust gas inlet and outlet openings are formed by inserting into and inserting into at least one intake mold insert part 40 formed in the mold cores 20 and 20 'so as to communicate with the intake passages 50 formed in the mold base plates 30 and 30'(110); And a control unit,
The multiple coupled intake mold part 110 includes:
And a molding surface 112 constituting a part of the shape of the cavity 10 is formed on one side of the molding surface 112. An inlet slit groove 112 for sucking gas from the molding surface 112 113) are formed on the inner surface of the mold (111);
An intake spacer 117 formed with an intake spacer through hole 117a for transmitting the gas sucked from the intake slit groove 113 to the intake passage 50 formed in the mold base plate 30, 30 '; And a control unit,
Wherein the gas is sucked in the cavity (10) by a vacuum suction means connected to the intake passage (50) a predetermined time before the injection of the molten liquid. The molding vacuum mold 100).
The method according to claim 1,
A coupling hole 114 formed in the coupled intake mold plate 111 so that the fixing means 119 can pass through the coupled intake mold plates 111 while being fixed to each other;
A lower connection slit groove 111 formed on the other side surface of the combined intake mold plate 111 and processed to allow the intake slit grooves 113 to communicate with each other when the respective combined intake mold plates 111 are coupled to each other, (116); (100) having a multiple-engaging metal part for vacuum suction.
The method according to claim 2,
And an intake mold mounting housing 118 formed with a mounting housing through hole 118a to which the combined intake mold plate 111 is inserted and fixed while being coupled with two or more of the intake mold mounting plates 111,
Wherein the intake spacer (117) is inserted into the mounting hole (118a) of the mounting housing (118).
The method according to claim 1,
In the multiple coupled intake mold portion 110,
Wherein the ventilating inlet mold (120) is part of the cavity (10), and the ventilating inlet mold (120) is made of a breathable material.
The method according to claim 4,
A mounting groove portion 120a further formed on a coupling side of the breathable intake metal mold 120 to the multiple combined intake metal mold portion 110;
The ventilation inlet 120 includes a ventilation inlet 120a and a ventilation inlet 120. The ventilation inlet 120 is formed with a ventilation inlet 120b and a ventilation inlet 120b. A breathable air intake core (121) further formed with a breathable air intake hole (122);
A ventilation intake mold mounting portion 118b further formed to be detachably mounted to the mounting groove portion 120a in the intake mold mounting housing 118; The vacuum mold (100) according to any one of claims 1 to 3, further comprising a plurality of coupling mold parts for vacuum suction.

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