KR100824439B1 - Vertical die casting machine of amorphous alloys - Google Patents

Abstract

A vertical die casting machine for amorphous alloys is provided to prevent the amorphous alloys from being oxidized by using a chamber having a vacuum pump therein. A vertical die casting machine comprises a die casting section including a lower mold(132), an upper mold(134), a melting pot(154), and a plunger(127), and a chamber(140) receiving the die casting section therein. A perforation hole(124) is formed in the mold in the vertical direction. The melting pot provides an amorphous molten alloy through the perforation hole. The plunger is inserted into the perforation hole to transfer the amorphous molten alloy. A vacuum pump(149) is installed in the chamber to prevent an amorphous alloy from being oxidized.

Description

Vertical die casting machine of amorphous alloys

1 is a die casting flowchart using a conventional horizontal die casting apparatus for amorphous alloy.

2 is a side view of a vertical die casting apparatus for an amorphous alloy according to a preferred embodiment of the present invention.

3 is a die casting flowchart using a vertical die casting apparatus for an amorphous alloy according to another embodiment of the present invention.

** Description of symbols for the main parts of the drawing **

124: through hole 125: plunger actuator

126, 136, 126a: forming surface 127, 127a: plunger

130: joint

132: lower mold 134: upper mold

135: Pictograph actuator 137: Eject actuator

138: eject pin 140: chamber

149: vacuum pump 154: crucible

155: crucible actuator 156: ingot storage

190: product collection unit 191: collection actuator

The present invention relates to a vertical die casting apparatus for an amorphous alloy, and more particularly, includes a chamber in which a die casting part is built and a vacuum pump is installed to prevent the amorphous alloy from being oxidized. It is directed to a vertical die casting apparatus for amorphous alloys in which the temperature of the molten metal becomes uniform due to a shorter feeding length of the alloy, thereby minimizing defects of the molded article.

Bulk amorphous alloys have recently been found in amorphous systems and generally maintain their atomic structure at low cooling rates (= 500K per second or less).

For example, while commercial amorphous alloys maintain cooling at a rate of 10 ^ 5 K / sec and maintain a thickness of 0.02 mm, mass production is possible within a diameter of 1.0 mm.

US invention patents 5288344, 5368659, 5618359, 5735975 are shown for such amorphous alloys.

Bulk amorphous alloys have been produced by means of mold casting or other metal molds.

Conventional horizontal die casting devices for amorphous alloys are those disclosed in US Pat. Nos. US6021840 and US5711363.

1 is a die casting flowchart using a conventional horizontal die casting apparatus for an amorphous alloy. Figure 1 schematically shows a horizontal die casting apparatus.

The conventional horizontal die casting apparatus for amorphous alloy includes a fixed die 32 having a sleeve 24 formed in a horizontal direction, a movable die 34 moving horizontally with respect to the fixed die 32, and a sleeve 24. A plunger 27 fitted to move the molten metal and a crucible 54 for providing molten metal to the inlet opening 58 connected to the sleeve 24.

Although not shown in FIG. 1, a vacuum chamber is provided which surrounds the crucible 54 and the plunger 27 and is maintained in a vacuum state.

The vacuum chamber as described above is provided to reduce the oxidation of the amorphous alloy is well oxidized.

The horizontal die casting device for amorphous alloy is poured into the sleeve through the inlet opening into the sleeve and the melt is transferred to the cavity 30 through the plunger to form a shape, and then the movable die is moved to move the product from the movable die. Pull out.

However, such a conventional horizontal die casting apparatus for amorphous alloy has a problem that the amorphous alloy is partially oxidized because the vacuum state is not maintained in all processes.

In addition, since the sleeve 24 is disposed in a horizontal state, flow occurs at the moment of pouring the molten metal into the sleeve 24, and thus the temperature of the molten metal is different, resulting in a defect in the product.

In addition, there is a problem in that the moving distance of the molten metal is not long uniform temperature distribution.

 The present invention has been made in order to solve the above problems, including a chamber having a die-casting portion, a vacuum pump is installed to prevent the oxidation of the amorphous alloy, to minimize the oxidation of the amorphous alloy, the transfer length of the molten metal The purpose of the present invention is to provide a vertical die casting apparatus for an amorphous alloy in which the temperature of the molten metal is uniformed to minimize the defect of the molded article.

Vertical die casting device for amorphous alloy of the present invention for achieving the above object, the upper die formed in the vertical through-hole, the upper die disposed on the lower die relative to move, and to provide an amorphous alloy molten metal in the through hole And a die casting part including a crucible, a plunger inserted into the through hole to move the amorphous alloy molten metal placed thereon, and a chamber including the die casting part and having a vacuum pump installed to prevent the amorphous alloy from being oxidized. Characterized in that made.

According to this configuration, there is an advantage of minimizing the oxidization of the amorphous alloy, shortening the transport length of the molten metal to uniform the temperature of the molten metal to minimize the defect of the molded article.

According to another embodiment of the present invention, a vertical die casting apparatus for an amorphous alloy includes a lower mold having a through hole formed in a vertical direction, an upper mold disposed on the lower mold to move relatively, and a crucible for providing an amorphous alloy molten metal to the through hole. And a die casting part including a plunger inserted into the through hole to move the amorphous alloy molten metal placed thereon, and a chamber having the die casting part embedded therein and preventing inert gas from being oxidized. It is characterized by.

In the above-described configuration, at least two crucibles may be provided, thereby eliminating the time required for dissolution, thereby increasing productivity by reducing the total cycle time.

Forming surface is formed on the upper surface of the plunger, there is an advantage that can minimize the defect of the product by minimizing the surface that the molten metal can come into contact with other foreign matter.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

For reference, among the configurations of the present invention to be described below, the same configuration as the prior art will be referred to the above-described prior art, and a detailed description thereof will be omitted.

3 is a side view of a vertical die casting apparatus for an amorphous alloy according to a preferred embodiment of the present invention, and FIG. 3 is a flowchart of a die casting using a vertical die casting apparatus for an amorphous alloy according to another embodiment of the present invention.

As shown in Figures 2 and 3, the vertical die casting apparatus for the amorphous alloy of the present embodiment, the lower die 132, the through-hole 124 is formed in the vertical direction, and the lower die 132 is disposed above the relative movement The upper mold 134, a crucible 154 for providing an amorphous alloy molten metal to the through hole 124, and a plunger 127 for moving the amorphous alloy molten metal inserted into the through hole 124 and placed thereon. It includes a die-casting portion, including the die casting portion, the vacuum pump 149 is installed to include a chamber 140 to prevent the amorphous alloy is oxidized.

The die casting part die casts an amorphous alloy melt to form a product.

The lower mold 132 has a molding surface 126 formed on a lower surface thereof, and a through hole 124 is formed in a vertical direction at a central portion thereof.

After the sleeve is inserted into the through hole 124 and the molding process is performed several times, the sleeve may be replaced to reduce the defect of the product.

The upper mold 134 is disposed above the lower mold 132, and the upper mold actuator 135 is disposed on the upper mold 132 to move relative to the lower mold 132 in a vertical direction.

Unlike the above, the lower mold 132 may be provided with an actuator to be moved.

Forming surface 136 is formed on the lower surface of the upper die 132, the cavity connecting the plurality of forming surface 136 is formed in the center so that the molten metal is transferred to each forming surface 136 in one die casting operation Multiple products can be produced.

The upper die 132 is formed so that the insertion hole into which the eject pin 138 may be inserted to communicate with the molding surface 136.

An eject actuator 137 is provided at the end of the eject pin 138, and when the molding is completed, the eject pin 138 is moved downward in the vertical direction to easily detach the product from the upper mold 132.

The crucible 154 receives the amorphous alloy from the ingot storage unit 156 and melts it to provide an amorphous alloy molten metal to the through hole 124.

The amorphous alloy is formed of a bulk amorphous alloy, the composition of which (Zr, Ti) = a is 30% to 75%, (Ni, Cu, Fe) = b is 5% to 60%, (Be, Al, Si, B) = c can be 0%-50%.

Up to 20% or more of categories such as Nb (niobium), Cr (chromium), V (vanadium), and Co (cobalt) can be supplied.

Unlike the foregoing, the composition of the bulk amorphous alloy is 45% to 64% for (Zr, Ti) = a, 10% to 40% for (Ni, Cu) = b, and 5% to 35 for (Be) = c. You can do it in%. Here, the ratio of Ti / Zr is between 0 and 0.25.

In another embodiment, the bulk amorphous alloy has a composition of (Zr) = a of 40% to 70%, (Ti, Nb) = b of 0% to 10%, and (Ni, Cu) = c of 10% to 45%. % And (Al) = d can be 5%-25%.

The crucible 154 is provided with a crucible actuator 155 to transfer the crucible 154 horizontally therebetween when the upper mold 134 is separated from the lower mold 132 to provide molten metal to the through hole 124. It is recovered.

Preferably, two or more crucibles 154 are provided to provide molten metal to the through hole 124 through one crucible 154 and the other crucible 154 to melt the amorphous alloy in a recovered state. Providing molten metal is quick.

The plunger 127 is inserted into the through hole 124 or the sleeve and provided with the plunger actuator 125 to move the amorphous alloy molten metal placed thereon so that the molten metal can be quickly moved to the cavity 130.

The tip is installed on the top of the plunger 127 so that only the tip is replaced after a plurality of moldings to prevent defects in the product even after repeated molding processes.

It is important to block oxygen during molding because oxygen is critical to contact with Ti (titanium) and Zr (zirconium), which have oxygen affinity, which are components of the amorphous alloy.

The chamber 140 includes the die casting part, and a vacuum pump 149 is installed to prevent the amorphous alloy from being oxidized during the die casting process.

Unlike the above, the chamber 140 may be filled with an inert gas such as argon gas to prevent the amorphous alloy from being oxidized.

The product collecting unit 190 is disposed in the chamber 140, and when the molding is completed, the product collecting unit 190 is transported horizontally between the upper mold 134 and the lower mold 132 to collect and recover a product falling free from the upper mold.

The product collection unit 190 is provided with a collection actuator 191 for this transfer process.

As a result, when the molten metal is poured into the through hole 124 so as to be placed on the plunger 127 through the crucible 154, the molten metal remains in the through hole 124 unlike the horizontal die casting apparatus. By minimizing the area the molten metal touches before this is completed, the contamination of the molten metal can be minimized to effectively reduce defects.

By minimizing the area in contact with the molten metal in this way, it is possible to prevent the rapid rotation of the molten metal during the rapid movement of the plunger 127 in the horizontal, it is possible to prevent the temperature of the molten metal from falling sharply.

In addition, the symmetry tolerances of the products are improved, which is effective for die casting of bulk amorphous alloys that are harder than conventional materials.

In addition, the molten metal is poured into the through hole 124 and is also inserted between the through hole 124 and the plunger 127 to be cooled to serve to prevent a gap between the through hole 124 and the plunger 127 to prevent sealing. There is no need.

Furthermore, since the amorphous molten metal has a higher hardness than the material of the sleeve or the plunger 127 fitted into the through hole 124, it serves to improve wear resistance.

As shown in FIG. 2, in the vertical die casting apparatus for the amorphous alloy according to another embodiment of the present invention, unlike the forming surfaces 126 and 136 formed on the upper mold 134 and the lower mold 132, the plunger 127a is provided. A molding surface 126a is formed on the upper surface thereof, and a molding surface 136 is formed on the upper mold 134 so as to correspond thereto.

2 is a simplified diagram in which the chamber and the like are omitted.

In this embodiment, when the molten metal is placed on the plunger 172a, the upper die 134 is lowered and the molten metal is filled in the molding surfaces 136 and 126a by moving the plunger 127a upward. When the molding of the product is completed, the upper mold 134 is raised and the plunger 127a is pushed upward to collect the product. Eject pins may be installed in the plunger 127a to facilitate product collection.

The operation of this embodiment having the above-described configuration will be described below.

The crucible 154 is melted in the crucible 154 to transfer the crucible 154 between the upper mold 134 and the lower mold 132.

The molten metal in the crucible 154 is poured into the through hole 124 so that the molten metal is placed on the plunger 137.

When the molten metal is poured, the upper mold actuator 135 is operated to move the upper mold 134 downward to contact the lower mold 132.

When the lower mold 132 and the upper mold 134 abut, the plunger 127 is moved upward by operating the plunger actuator 125 so that the molten metal is filled in the molding surfaces 136 and 126.

When the cooling of the product is completed, the upper mold 134 is moved upward and the eject pin 138 is moved downward to release the product from the upper mold.

At the same time, the product collecting unit 190 is transferred between the upper mold 134 and the lower mold 132 by using the collection actuator 191 to collect and recover the free-falling product.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications or variations of the present invention without departing from the spirit and scope of the invention described in the claims below Can be carried out.

According to the vertical die casting apparatus for amorphous alloy of the present invention as described above, there are the following effects.

Including the die-casting unit, including a chamber to prevent the oxidation of the amorphous alloy by installing a vacuum pump or inert gas is filled, to minimize the oxidation of the amorphous alloy, the length of the molten metal is shortened by the transfer length of the melt The uniformity has the advantage of minimizing defects in the molded article.

The temperature change is small until the product is molded.

The incidence of defects such as pores is low due to the short length between the molten metal and the cavity.

Since the solubility is also in a vacuum atmosphere, the molten metal is stable.

By minimizing the reaction between oxygen and molten metal has a great effect on the regeneration of the material.

By evacuating the entire chamber, the incidence of defects in the product can be significantly reduced.

Since mold installation and removal are easy, it can be standardized and contribute to increase of operation rate.

By using the free fall principle when ejecting the product from the upper mold, it is possible with little force.

Furthermore, at least two crucibles may be provided, thereby eliminating the time required for dissolution, thereby increasing productivity by reducing the total cycle time.

In addition, the dissolution time of the molten metal can be sufficiently formed to form a stable molten metal.

Forming surface is formed on the upper surface of the plunger, there is an advantage that can minimize the defect of the product by minimizing the surface that the molten metal can come into contact with other foreign matter.

Claims (4)

A lower mold having a through hole formed in a vertical direction, an upper mold disposed on the lower mold to move relatively, a crucible for providing an amorphous alloy molten metal to the through hole, and an amorphous alloy melt inserted into the through hole and placed on the upper part; A die casting unit including a plunger; Built-in die casting unit, vertical die casting device for an amorphous alloy, characterized in that it comprises a vacuum pump is installed to prevent the amorphous alloy is oxidized. A lower mold having a through hole formed in a vertical direction, an upper mold disposed on the lower mold to move relatively, a crucible for providing an amorphous alloy molten metal to the through hole, and an amorphous alloy melt inserted into the through hole and placed on the upper part; A die casting unit including a plunger; Built-in die casting unit, vertical die casting device for an amorphous alloy, characterized in that it comprises a chamber which is filled with an inert gas to prevent the amorphous alloy is oxidized. The method according to claim 1 or 2, At least two crucibles are provided, vertical die casting apparatus for an amorphous alloy. The method according to claim 1 or 2, Vertical die casting apparatus for an amorphous alloy, characterized in that the forming surface is formed on the upper surface of the plunger.

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