HK1224250B - Mold apparatus for molding metal in high vacuum environment - Google Patents

Abstract

The present invention relates to a mold apparatus for molding a metal in a high vacuum environment, the apparatus comprising: a fixed mold (110); a movable mold (120) which is in contact with the upper section of the fixed mold (110) so as to form a cavity (130); and an ejector pin (140) which is formed so as to pass through the movable mold (120) and reach the cavity (130). In a state that a vacuum environment is created by pulling out air from the cavity (130) by using an exhaust apparatus (190), a molten metal is filled and molded, and thereafter a molded product is pushed and demolded using the ejector pin (140). A sealing plate (150) is tightly laid on the upper section of the movable mold (120) so that the ejector pin (140) passes through the sealing plate (150) and the movable mold (120) in order, and a packing (P1) is installed in a hole on the sealing plate (150) through which the ejector pin (140) passes so that external air is prevented from flowing into the cavity (130). A blocking space (180) is formed between the movable mold (120) and the packing (P1), thereby blocking heat from being conducted to the packing (P1). That is, the present invention relates to a mold apparatus for molding a metal in a high vacuum environment, which: enables the metal to be molded in a state of forming, in a high vacuum, a space where the metal is molded, so that the physical properties of a molten metal can be prevented from being changed when the molten metal is in contact with air; can minimize damage by heat due to a packing, which is installed in order to block external air from flowing into the space where the metal is formed; and is economical due to the use of the packing, which is less costly.

Description

Mould device for forming metal in high vacuum environment

Technical Field

The present invention relates to a metal forming die apparatus, and more particularly, to a metal forming die apparatus for forming metal.

Background

Metals can be formed by various methods, typical of which are die-based casting and forging. Casting or forging is suitable for mass production because it allows metal to be quickly and accurately formed.

In a casting or forging mold apparatus, a cavity is generally formed by combining a movable mold and a fixed mold to form a cavity for molding a product, and a molten metal melted by heating the metal is poured into the cavity to be filled (casting) or solidified (forging) under pressure, and then the movable mold and the fixed mold are separated from each other to release the molded product.

Here, the molded product is released from the movable mold by an ejector pin (ejector pin). And after the movable mould is separated from the fixed mould, the formed product is in a state of being stuck on the movable mould, and the length of the ejection pin is enough to penetrate through the movable mould and reach the female mould core, and the formed product is pushed to move forwards towards the female mould core by virtue of the cylinder so as to be separated from the movable mould.

On the other hand, when the metal melt is formed, the metal melt is rapidly oxidized after contacting the atmosphere, and foreign substances are introduced into the metal melt to generate Dross (Dross). Although the dross has a slight effect of preventing contact with the atmosphere, it interferes with the continuous stirring operation during the metal melting process, and it is difficult to continuously supply a molten metal having a good quality. In order to solve this problem, a mold apparatus for molding a metal in a vacuum environment is disclosed in the prior art. For example, patent publication No. 10-2004-0103251 (2004.12.8) discloses "a die casting device providing an improved degree of vacuum in a molding operation".

However, in the mold apparatus for molding metal in a vacuum environment, it is difficult to form the cavity in a high vacuum state by using the apparatus for releasing the molded product through the ejector pin. This is because, in order to allow the ejector pin to be mounted to pass through the movable mold and reciprocate, a minute gap is inevitably formed between the ejector pin and the hole through which the ejector pin passes, and external air flows into the cavity through the gap.

Disclosure of Invention

The technical problem solved

The present invention is directed to solving the above-mentioned problems, and an object of the present invention is to provide a mold apparatus that effectively prevents external air from flowing into a cavity through a gap between an ejector pin and a hole through which the ejector pin passes, so that metal can be molded while maintaining a high vacuum in the cavity.

Technical scheme for solving technical problem

The invention installs the sealing element in the gap between the ejector pin and the hole through which the ejector pin passes so as to prevent the external air from flowing into the cavity when the vacuum is formed in the cavity.

The invention relates to a die device for forming metal in a high vacuum environment, which comprises: fixing the mold; the movable mould is connected with the upper part of the fixed mould to form a female mould core; the ejection pin penetrates through the movable mould and reaches the cavity insert; filling metal melt in a vacuum environment formed by exhausting air from the cavity insert by using an exhaust device, molding, pushing the molded product by using the ejector pin to realize demolding, wherein a sealing plate is closely arranged on the upper part of the movable mold, the ejector pin sequentially penetrates through the sealing plate and the movable mold, a sealing element is arranged on a hole in the sealing plate, through which the ejector pin penetrates, so that external air is prevented from flowing into the cavity insert, and an isolation space is formed between the movable mold and the sealing element to prevent heat transfer to the sealing element.

Effects of the invention

According to the present invention, the metal is formed in a state where the space for forming the metal is in a high vacuum state, thereby preventing the metal melt from being changed in physical properties due to contact with air. Further, the seal installed to prevent the inflow of the outside air into the metal molding space can be prevented from being thermally broken as much as possible, and an economical mold apparatus can be realized using an inexpensive seal.

Drawings

Fig. 1 is an exemplary view showing a schematic configuration of a mold apparatus according to the present invention.

Fig. 2 is an exploded view of portion a of fig. 1.

Fig. 3 is a sectional view of a portion a of fig. 1.

Fig. 4 is a sectional view of a portion B of fig. 1.

Fig. 5 is a sectional view of the portion C of fig. 1.

Fig. 6 is an explanatory view showing a schematic configuration of a mold apparatus according to another embodiment of the present invention.

Fig. 7 to 10 are explanatory views showing a process of molding a metal product using the mold apparatus of the present invention.

Detailed Description

The present invention provides a mold device capable of effectively preventing external air from flowing into a cavity through a gap between an ejector pin and a hole through which the ejector pin passes so as to form a metal while maintaining a high vacuum state in the cavity,

the die device for forming metal in high vacuum environment forms a female die core at the joint of a fixed die and a movable die, is provided with an ejector pin penetrating through the movable die and reaching the female die core, fills metal melt in the female die core in a vacuum environment through an exhaust device for forming, and then uses the ejector pin to push a formed product to realize demoulding,

a sealing member is installed between the ejector pins and the holes through which the ejector pins pass so as to prevent external air from flowing into the cavity core when a vacuum environment is formed, and an insulation space is formed in front of the sealing member so as to insulate heat transmitted from the sealing member.

The present invention is described in detail below with reference to the drawings, fig. 1 to 10.

Fig. 1 is an exemplary view showing a schematic structure of a mold apparatus according to the present invention, fig. 2 is an exploded view of a portion a of fig. 1, fig. 3 is a sectional view of the portion a of fig. 1, fig. 4 is a sectional view of a portion B of fig. 1, and fig. 5 is a sectional view of a portion C of fig. 1.

As shown in the drawings, the mold apparatus of the present invention includes a fixed mold 110 and a movable mold 120, and a cavity 130 is formed at a junction between the fixed mold 110 and the movable mold 120, wherein the cavity 130 is a space into which a molten metal is filled and molded. A riser 132 for heating metal is formed at the lower side of the cavity insert 130, and a pressurizing plunger 170 is provided at the riser 132 for pushing the molten metal generated in the riser 132 into the cavity insert 130.

The fixed mold 110 is a fixed mold, and the movable mold 120 may be moved back in a direction away from the fixed mold 110 or moved forward in a direction toward the fixed mold 110, and the cavity insert 130 is opened when the movable mold is moved back.

The movable mold 120 is provided with ejector pins 140, and the ejector pins 140 are used for removing the product molded in the cavity 130. The ejector pins 140 are in the form of a rod, preferably, one or more in the form of a circle in section, which penetrates the movable mold 120 and reaches the cavity core 130 at the end. The end is formed to advance in a direction in which the cavity 130 protrudes or retreat in an opposite direction, and the end protrudes in the cavity 130 to separate the molded product from the movable mold 120.

The cavity insert 130 creates a vacuum environment. Air is evacuated from the cavity 130 through an additional exhaust 190 to create a vacuum environment. The exhaust 190 exhausts air through at least one exhaust pipe to create a vacuum environment for the cavity 130.

Here, a seal P3 is installed along the contour of the cavity insert 130 at the point where the movable mold 120 meets the fixed mold 110. Referring to fig. 5, the cavity 130 is isolated from the external air flowing into the cavity 130 during or after the vacuum environment.

Furthermore, the present invention installs the sealing member P1 between the ejector pin 140 and the hole through which the ejector pin 140 passes, thereby isolating air that may flow through the hole through which the ejector pin 140 passes, and thus creating a high vacuum environment for the cavity insert 130.

The seal P1 can be formed at the entrance of the hole through which the ejector pin 140 passes. At this time, referring to fig. 2 and 3, the sealing groove 122 for installing the sealing member P1 is formed at the entrance of the hole, so that the sealing member P1 is received and installed by the sealing groove 122 in a state of not being exposed to the outside. At the same time, the separation preventing ring 124 is inserted into the inlet of the seal groove 122 in order to prevent the seal P1 from falling from the seal groove 122.

The inlet of the sealing groove 122 is wider and the diameter decreases in a funnel shape as it goes inward and starts to form the same diameter at a point where the sealing member P1 is located. In the case where the separation preventing ring 124 is provided, the separation preventing ring 124 can be formed so as to be placed together. With this structure, the seal P1 can be more easily inserted into the seal groove 122.

On the other hand, the mold apparatus of the present invention, which fills the cavity 130 with the molten metal to form the product, generates a considerable amount of heat during the product forming process. In particular, in order to prevent rapid thermal deformation of the metal, the product is molded in a state where the movable mold 120 is heated to a high temperature of 200 to 300 ℃, and the heat affects the seal P1 attached to the hole through which the eject pin 140 penetrates, thereby damaging the seal P1.

To prevent this, the present invention forms the insulation space 180 blocking heat transfer to the seal P1. An insulating space 180 is formed between the seal P1 and the movable mold 120 so that the heat of the movable mold 120 cannot be transferred to the seal P1.

The insulation space 180 may be implemented through the closing plate 150. The closing plate 150 is formed in a plate state and is disposed at an upper portion of the movable mold 120, and the insulation space 180 is formed between the movable mold 120 and the closing plate 150. For example, when the closing plate 150 forms a concave space where it meets the movable mold 120, the insulating space 180 is naturally formed.

Referring to fig. 4, preferably, a sealing member P2 is installed between the closing plate 150 and the movable mold 120 along the contour of the insulation space 180 to close the insulation space 180 formed as described above.

In the structure in which the closing plate 150 is formed, the ejector pins 140 sequentially pass through the closing plate 150, the insulation space 180, and the movable mold 120 to reach the cavity core 130. Further, a seal P1 is attached to the upper surface of the closing plate 150 at the entrance of the hole through which the ejector pin 140 passes. At this time, a sealing groove 122 is formed in the closing plate 150 where the sealing member P1 is installed, and the separation preventing ring 124 is sandwiched by the sealing groove 122.

The exhaust 190 exhausts air from the cavity insert 130 and the isolation space 180 simultaneously.

The insulation space 180 is a hollow space inside and prevents heat occurring on the movable mold 120 from being transferred to the seal P1. It is possible to prevent the heat damage of the seal P1 without degrading the closing performance even if an inexpensive product with low heat resistance is used, thereby saving costs and achieving economic benefits.

The support plate 160 may be disposed on the upper portion of the closing plate 150 formed as described above. The support plate 160 is in a plate form and is disposed adjacent to the closure plate 150, and can be formed separately from the closure plate 150. In the drawings, the support plate 160 is disengaged from the closing plate 150 and rises as it is lifted upward. In this state, the seal P1 can be installed or replaced.

As described above, the seal P1 is firmly supported by being pressed by the support plate 160 while being attached between the closing plate 150 and the support plate 160, and as a result, the attached state of the seal P1 can be stably maintained.

Fig. 6 is an explanatory view showing a schematic configuration of a mold apparatus according to another embodiment of the present invention.

As shown in the drawings, the mold apparatus according to the other embodiment of the present invention has a closing plate 150 disposed closely to the upper portion of the movable mold 120, and the insulation space 180 is formed between the movable mold 120 and the closing plate 150. The ejector pin 140 sequentially penetrates the closing plate 150 and the movable mold 120. Referring to fig. 1, a supporting plate 160 excluding the foregoing embodiment is shown.

In this embodiment, the seal P1 may be installed at the bottom surface of the closeout plate 150, ejecting the entrance to the hole through which the pin 140 passes. At this time, the pellet 126 is attached to prevent the seal P1 from being detached. The pellet rod 126 stands up in the insulating space 180 by being supported by the seal member P1 at the upper end and being pressed while the lower end is supported by the movable die 120. The ejector pins 140 thus extend through the pellet bar 126 and through the movable die 120, and the pellet bar 126 not only prevents the seal P1 from being disengaged, but also isolates the isolation space 180 from the ejector pins 140.

The pellet rod 126 is preferably made of a material having heat insulation properties, but is not limited thereto.

The symbols not illustrated in the drawings are the same as those in the foregoing embodiment, and therefore, the description thereof will be omitted below.

The process of forming a product using the metal melt by the die apparatus of the present invention will be described in detail. Fig. 7 to 10 are explanatory views showing a process of molding a metal product using the mold apparatus of the present invention.

First, referring to fig. 7, the movable mold 120 is raised and cleans the cavity 130 and the flash 132 formed at the lower portion of the cavity 130. High-pressure air is injected to perform cleaning, and a release agent and a lubricating oil are injected after the cleaning.

After the cleaning is completed, the metal is poured into the inside of the riser 132 and heated, and the movable mold 120 is lowered. Referring to fig. 8, after the movable mold 120 and the fixed mold 110 are combined, the exhaust unit 190 is actuated to simultaneously exhaust air from the cavity core 130 and the isolation space 180, and the valve is closed to create a high vacuum environment after the air is completely exhausted.

After the metal is sufficiently heated and melted, referring to fig. 9, the pressurizing plunger 170 is raised to fill the melted metal, i.e., the metal melt, into the cavity insert 130. Then, it is left to cool for a certain time so that the metal is shaped in accordance with the shape of the cavity insert 130. In this process, the movable mold 120 is heated to a certain temperature, and the heat generated on the movable mold 120 is prevented from being transferred by the insulating space 180.

Referring to fig. 10, the movable mold 120 is raised again after cooling. At this time, the molded product is attached to the movable mold 120 and ascends together with the movable mold 120, the ejector pins 140 advance toward the molded product side, and the molded product is separated from the movable mold 120 to be released from the mold.

Finally, the product is finished after post-treatment such as grinding, painting and the like is carried out on the demoulded product, and the processes are repeatedly carried out, so that the metal can be continuously formed in a high-vacuum environment.

Claims (2)

1. A mold apparatus for forming a metal in a high vacuum environment, comprising:

a stationary mold (110);

a movable mold (120) connected to an upper portion of the fixed mold (110) to form a cavity (130); and

an ejector pin (140) penetrating the movable mold (120) and reaching the cavity core (130);

filling metal melt in the cavity insert (130) and forming the cavity insert under the condition that the air is pumped out from the cavity insert (130) by an air exhaust device (190) to form a vacuum environment, then pushing the formed product by the ejector pin (140) to realize demoulding,

a closing plate (150) is closely installed on an upper portion of the movable mold (120) and the ejector pins (140) sequentially penetrate the closing plate (150) and the movable mold (120), a sealing member (P1) is installed on holes of the closing plate (150) through which the ejector pins (140) penetrate to prevent external air from flowing into the cavity core (130),

forming an insulating space (180) between the movable mold (120) and the sealing member (P1) to prevent heat transfer to the sealing member (P1),

wherein the sealing member (P1) is installed on the bottom surface of the closing plate (150) at the entrance of the hole through which the ejector pin (140) passes, having a pellet stick (126) which supports the sealing member (P1) at the upper end and gives pressure in the insulation space (180) while the lower end is supported by a movable mold (120), so that the ejector pin (140) passes through the pellet stick (126),

in the through direction of the ejector pins (140), the height of the insulation space (180) is greater than the height of the seal (P1) and the height of the pellet stick (126) is greater than the height of the seal (P1).

2. The mold apparatus for molding metal under high vacuum environment of claim 1, wherein the air exhausting means (190) exhausts air from the cavity insert (130) and the insulating space (180) simultaneously.