KR20120005656A - Melting furnace and diecasting mold using the same - Google Patents

Abstract

PURPOSE: A melting furnace and a pressing casting device comprising the same are provided to rapidly inject molten metal with a relatively high melting point at sufficient pressure and enable forming using molten metal with great specific gravity. CONSTITUTION: A pressing casting device comprises a mold(10) and a molten-metal supply chamber(20). The mold comprises a space(12), to which molten metal is supplied and where forming is made. The molten-metal supply chamber is formed so that the volume of an inner space holding molten metal supplied to the space of the mold can change. An extruding hole(20B) is formed on the molten-metal supply chamber. The extruding hole connects the inner space to the space of the mold in a closed state so that the molten metal in the inner space can be extruded to the space of the mold by the change in the volume of the inner space.

Description

Melting furnace and die casting apparatus including the same {Melting furnace and diecasting mold using the same}

The present invention relates to a pressure casting apparatus, and more particularly, to a melting furnace for supplying a molten metal for molding a product by pressure casting and a pressure casting apparatus including the same.

In general, the pressure casting method is a method of injecting and solidifying molten metal into a molding space of a mold in which a cast product is formed, and has advantages such as high productivity, high dimensional accuracy, beautiful cast surface, and thin cast product. Therefore, it is widely used in many kinds of automobile parts, electric parts and daily necessities.

The injection of the molten metal in the pressure casting process is performed as follows.

When the connection part of the melting furnace which supplies a molten metal and the molding space of a mold is sealed, when gas of predetermined pressure is filled in the inside of a melting furnace, the melted gas in a melting furnace is injected into the molding space of a mold by this filled gas pressure, Fill the molding space.

The pressure casting method is characterized in that the molten metal is injected in a state in which the connection portion between the melting furnace and the molding space of the mold is closed, so that the molten metal is not exposed to the air during the injection of the molten metal. In addition, since the molten metal in the melting furnace is injected by the gas pressure filled in the melting furnace, the molten metal is injected at a relatively low pressure.

However, in the conventional pressure casting method, as described above, the injection pressure of the molten metal is injected by the gas pressure filled in the melting furnace, so that the injection pressure of the molten metal is low, and there is a limit in increasing the gas pressure filled in the melting furnace. Therefore, molten metal having a relatively small specific gravity, such as aluminum, can be sufficiently injected even by the gas pressure filled in the furnace, but injection of a molten metal having a relatively high specific gravity, such as copper, within an appropriate time due to the gas pressure filled in the melting furnace is required. unrealistic.

Therefore, the conventional pressure casting method has a problem that the material of the cast product is limited due to the specific gravity of the molten metal.

The present invention has been made in order to solve the above problems, it is an object of the present invention to provide a melting furnace and a pressure casting device including the same that can be injected quickly with sufficient pressure even a relatively high specific gravity.

It is also an object of the present invention to provide a melting furnace capable of rapidly injecting a molten metal having a relatively high melting point with sufficient pressure, and a pressure casting device including the same.

In order to solve the above problems, the present invention provides a mold having a molding space is formed by supplying the molten metal; The internal space containing the molten metal supplied to the molding space of the mold is formed to be changeable in volume, and the molten metal contained in the internal space may be extruded into the molding space into the mold by the volume change of the internal space. It proposes a pressurized casting apparatus comprising a; molten metal supply chamber formed on one side and an extrusion hole connected in a sealed state with the molding space of the mold.

The molten metal supply chamber may be formed as a movable part which is movable toward the inner space of the molten metal supply chamber so that a portion of the molten metal may reduce the volume of the inner space of the molten metal supply chamber for extrusion of the molten metal.

The fixing portion of the molten metal supply chamber constituting the molten metal supply chamber together with the moving portion, the main body portion having an opening formed in a position corresponding to the moving portion; It may include a guide portion formed through the opening of the main body portion spaced apart from the extrusion opening of the molten metal supply chamber, a passage formed therein corresponding to the moving portion, the passage is installed so that the moving portion can move relative.

An extrusion hole of the molten metal supply chamber may be formed in the main body.

The guide portion may be formed longer than the thickness of the body portion.

The moving part of the molten metal supply chamber may be connected to the hydraulic generating part to be movable by hydraulic pressure.

The moving part of the molten metal supply chamber may be located on the upper surface or the side of the molten metal supply chamber.

The extrusion port of the molten metal supply chamber is formed on the upper surface or the side of the molten metal supply chamber, the mold may be installed to be connected to the surface formed with the extrusion port of the molten metal supply chamber.

The lower surface of the molten metal supply chamber may be formed with a tap opening that is opened and closed by a valve.

The apparatus may further include a heating unit configured to apply heat to the molten metal supply chamber so that the thermal insulation of the molten metal in the inner space of the molten metal supply chamber and the material of the molten metal are dissolved in the inner space of the molten metal supply chamber to form the molten metal.

The heating unit may include an outer chamber having an inner space in which the molten metal supply chamber is embedded, and a heat source unit installed in the inner space of the outer chamber and supplying a heat source to heat the molten metal supply chamber.

The heating unit may further include a filling material to fill the inner space of the outer chamber.

The filler may be formed of a ceramic material.

The apparatus may further include a molten metal material supply unit connected to the internal space of the molten metal supply chamber to press the molten metal material into the internal space of the molten metal supply chamber.

The molten material is supplied in the form of a wire or a bar, and the molten material supply unit is connected to an internal space of the molten metal supply chamber to guide the molten material in the form of a wire or a bar into the internal space of the molten metal supply chamber. Or a molten material guide part having a passage corresponding to a size of a bar-shaped molten material, and the molten material moving the molten material so that the molten material can be pressed into the inner space of the molten metal supply chamber through the molten metal material guide part. It may include a moving unit.

The molten material may be in the form of a wire or bar having a smaller cross-sectional size than the extrusion port of the molten metal supply chamber.

When the molten metal contained in the inner space of the molten metal supply chamber is extruded by the molten metal supply chamber, the molten material is supplied and heated so that the molten metal is filled by the amount extruded by the molten metal of the molten metal supply chamber. It may include a central control unit for controlling the movement of the molten metal supply chamber and the heating unit, the molten metal material supply unit.

In addition, in order to solve the above problems, the present invention is formed so that the internal space containing the molten metal can be changed in volume, the molten metal supply chamber is formed on one side of the extrusion hole is extruded by the volume of the internal space is extruded It presents a furnace characterized in that it comprises a.

The molten metal supply chamber may be formed as a movable part movable toward the inner space of the molten metal supply chamber so that a portion of the molten metal may reduce the volume of the inner space of the molten metal supply chamber for extruding the molten metal.

The apparatus may further include an outer chamber having an inner space in which the molten metal supply chamber is embedded, and a heat source unit installed in the inner space of the outer chamber and supplying a heat source to heat the molten metal supply chamber.

It may further include a filling material for filling the inner space of the outer chamber.

The apparatus may further include a molten metal material supply unit connected to the internal space of the molten metal supply chamber to press the molten metal material into the internal space of the molten metal supply chamber.

The molten material is supplied in the form of a wire or a bar, and the molten material supply unit is connected to an internal space of the molten metal supply chamber to guide the molten material in the form of a wire or a bar into the internal space of the molten metal supply chamber. Or a molten material guide part having a passage corresponding to a size of a bar-shaped molten material, and the molten material moving the molten material so that the molten material can be pressed into the inner space of the molten metal supply chamber through the molten metal material guide part. It may include a moving unit.

Melting furnace according to the present invention and the pressure casting apparatus including the same can be extruded by the volume change of the internal space of the molten metal supply chamber, the extrusion pressure of the molten metal can be formed sufficiently and rapid pressure rise is possible, the specific gravity Not only molding by a large molten metal can be carried out but also it can have an effect of obtaining a molded article of excellent quality.

In addition, the melting furnace according to the present invention and the pressure casting device including the molded article because the molten metal is directly extruded from the molten metal supply chamber into the mold can prevent the air exposure of the molten metal to prevent the generation of oxides, incorporation of release agent, etc. Not only can the defect rate be significantly reduced, but it can have the effect of obtaining a molded article of excellent quality.

In addition, the melting furnace and the pressure casting apparatus including the same according to the present invention has the effect that the temperature reduction and temperature deviation of the molten metal is not large as the molten metal is directly extruded into the mold from the molten metal supply chamber, thereby obtaining a molded product of excellent quality. Can be.

In addition, the melting furnace and the pressure casting apparatus including the same according to the present invention, since the portion of the molten metal supply chamber is composed of a moving part such as a plunger to change the volume of the molten metal supply chamber, the structure and design of the molten metal supply chamber is simple, easy Instead, the volume change of the molten metal supply chamber can be easily made.

In addition, the melting furnace and the pressure casting apparatus including the same according to the present invention is a structure in which the moving part of the molten metal supply chamber is the same as the plunger, but it is not configured to directly extrude the molten metal through the extrusion port of the molten metal supply chamber but to vary the volume of the molten metal supply chamber. Because it is a configuration for precise design is not required and do not have to pay much attention to heat deformation, it can have the effect of easy manufacturing, maintenance, and repair of the molten metal supply chamber.

In addition, the melting furnace and the pressure casting apparatus including the same according to the present invention is not a configuration in which the moving part of the molten metal supply chamber is immersed in the high temperature molten metal, but only a part of the molten metal is secured to the durability of the moving part of the molten metal supply chamber. Therefore, the high temperature of the molten metal may have an effect of ensuring that durability of the moving part of the molten metal supply chamber is maintained, maintenance problems, and breakage of the moving part of the molten metal supply chamber.

In addition, the melting furnace and the pressure casting apparatus including the same according to the present invention may be configured with a guide for guiding the movement of the moving portion of the molten metal supply chamber, in particular the guide portion of the molten metal supply chamber is not structurally connected to the extrusion port of the molten metal supply chamber Since the guide part is not immersed in the high temperature molten metal like the moving part because it is installed on the opening side of the main body part more preferably, the guide part is also secured to the durability of the moving part of the molten metal supply chamber, maintenance problems, and It may have the effect of not having to pay much attention to the problem of damage to the moving part.

In addition, the melting furnace and the pressure casting apparatus including the same according to the present invention can be more reliably prevented from exposing the molten metal to the molten metal in the molten metal supply chamber as well as the warming of the molten metal by the heating unit. And, it may have an effect that the oxidation of the melt, the temperature loss of the melt and the like can be prevented.

In addition, the melting furnace and the pressure casting apparatus including the same according to the present invention is directly connected to the molten material supply for supplying the molten material to the molten metal supply chamber, it is possible to supply the molten material without opening or closing the molten metal supply chamber. Therefore, the exposure of the molten metal to the air can be prevented more reliably, the temperature loss of the molten metal can be prevented, and the supply of the molten metal material can be made quickly.

1 is a cross-sectional view showing a state before the melt extrusion of the pressure casting apparatus according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing the melt extrusion state of the pressure casting apparatus according to an embodiment of the present invention.

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

As shown in Figure 1, the pressure casting apparatus according to an embodiment of the present invention comprises a mold 10 is formed with a molding space 12 is formed by supplying the molten metal (2); The internal space 20A with the molten metal 2 supplied to the molding space 12 of the mold 10 is formed to be capable of volume change, and the molten metal contained in the internal space 20A by the volume change of the internal space 20A. An extrusion hole 20B connected to the molding space 12 of the mold 10 in a sealed state is formed at one side of the internal space 20A so that (2) can be extruded into the molding space 12 of the mold 10. It may include a molten metal supply chamber 20.

The mold 10 can be variously configured according to the type of the molten metal 2, the shape of the molded article, and the like.

For example, the mold 10 may be configured to be separated up and down as shown, and may be configured to be separated in left, right, front and back directions, although not shown. In addition, the mold 10 may be installed on the upper side of the molten metal supply chamber 20 as shown, and may be configured to be installed on the left / right, front and rear sides of the molten metal supply chamber 20, although not shown.

However, the mold 10 may be more advantageously installed to be in contact with the outer surface on which the extrusion port 20B of the molten metal supply chamber 20 is formed. In this case, since the molten metal 2 extruded from the molten metal supply chamber 20 may be directly injected into the molding space 12 of the mold 10, the molten metal injected into the molding space 12 of the mold 10 ( Temperature control of 2) can be easy. In addition, since the pipe for guiding the melt extrusion between the molten metal supply chamber 20 and the mold 10 is not necessary, the overall structure can be simplified.

The molten metal supply chamber 20 is a configuration capable of changing the volume of the internal space 20A, the whole may be configured to be movable for the volume change, as shown, only a part of the molten metal supply for the extrusion of the molten metal 2 In order to reduce the volume of the internal space 20A of the chamber 20, it is more efficient to constitute a moving part 22 that is movable toward the internal space 20A of the molten metal supply chamber 20.

That is, the molten metal supply chamber 20 constitutes the majority of the molten metal supply chamber 20, and the molten metal supply chamber 20 together with the fixing portion 24 and the fixing portion 24 that are installed as a fixed body and the molten metal 2 The moving part coupled with the fixing part 24 to move toward the inner space 20A of the molten metal supply chamber 20 to reduce the volume of the inner space 20A of the molten metal supply chamber 20 for extrusion of 22).

When only a part of the molten metal supply chamber 20 is configured as the moving part 22, the structural design of the molten metal supply chamber 20 can be simplified and facilitated, and the volume of the molten metal supply chamber 20 is sufficiently sufficient even with a small power. When the volume of the molten metal supply chamber 20 is variable, only the portion of the moving part 22 side of the molten metal supply chamber 20 to maintain the airtight maintenance of the molten metal supply chamber 20 can be easy In addition, maintenance and repair of the molten metal supply chamber 20 may be easily performed because only the moving part 22 of the molten metal supply chamber 20 may be repaired and replaced by frictional wear due to a variable volume of the molten metal supply chamber 20. have.

In particular, the fixing part 24 may be formed of only one member, but may be configured as follows.

That is, the fixing part 24 constitutes most of the fixing part 24, and the main body part formed of the opening 25A having the above-described extrusion hole 20B formed at one side and a portion corresponding to the moving part 22 is opened. 25 and a guide portion 26 fixedly installed in the opening portion 25A of the main body portion 25 and guiding the movement of the moving portion 22.

When the fixing part 24 is composed of the main body portion 25 and the guide portion 26 as described above, the movement of the moving portion 22 is guided by the guide portion 26, thereby operating and sealing the moving portion 22. It is excellent and can be more advantageous in terms of maintenance and repair because only the guide portion 26 need to be repaired and replaced by wear, etc., and the main body portion 25 and the guide portion 26 are formed of different materials according to their respective characteristics. can do.

Here, the main body 25 may be formed of a material such as ceramic so as to be strong against internal pressure, impact resistance, and the like. Furthermore, the body portion 25 may be reinforced by strength of a reinforcing member such as a steel plate installed on the outer surface of the body portion 25.

Guide portion 26 is formed and installed so that airtightness can be maintained between the main body portion 25, as well as the passage (26A) where the moving portion 22 is installed to be relatively movable, the moving portion 22 is guided It may be formed to correspond to the shape and size of the moving unit 22 to be moved while maintaining the airtight portion 26 and. In particular, the guide part 26 fully supports the moving part 22 while maintaining the airtightness with the moving part 22. In other words, the guide part 26 may move in and out of the inner space 20A of the molten metal supply chamber 20, that is, of the moving part 22. It is formed to be longer than the thickness 25T of the body portion 25 along the moving direction (26L) can be installed through the body portion 25. In addition, since the guide part 26 only needs to guide the moving part 22 to protrude toward the inner space 20A of the molten metal supply chamber 20, the guide part 26 does not need to be connected to the extrusion port 20B of the molten metal supply chamber 20. And it is good that not much exposed in the high temperature molten metal 2, it may be more preferable to be installed in a state spaced apart from the extrusion port (20B) of the molten metal supply chamber (20).

Such a guide part 26 may be formed of a ceramic material or a structure coated with a ceramic material so that there is little thermal deformation for airtightness and excellent wear resistance due to friction with the moving part 22.

The moving part 22 may constitute the entire wall surface of the molten metal supply chamber 20, but as described above, the structure is simplified and easy to design, the operability of the moving part 22, airtightness management, ease of maintenance, and the like. Can be configured as a plunger.

In particular, the moving part 22 does not press the molten metal 2 contained in the inner space 20A of the molten metal supply chamber 20 toward the extrusion port 20B of the molten metal supply chamber 20 directly along the sleeve or the like. The sleeve & plunger combination only needs to protrude toward the inner space 20A of the molten metal supply chamber 20 so that the volume of the molten metal supply chamber 20 can be changed, that is, reduced for the extrusion of the molten metal 2. No design as precise as the structure is required. Therefore, manufacturing, maintenance, and repair of the molten metal supply chamber 20 including the moving part 22 may be easy.

The moving part 22 may be located anywhere of the molten metal supply chamber 20, but more preferably, may be located on the upper surface or the side of the molten metal supply chamber 20. That is, when the moving part 22 is located on the upper surface or the side of the molten metal supply chamber 20, the pressure, weight, etc. of the molten metal 2 contained in the internal space 20A of the molten metal supply chamber 20 It can be smoothly moved by a small power without being affected by, the gap between the moving portion 22 and the guide portion 26 by gravity is melted in the inner space 20A of the molten metal supply chamber 20 There is no fear of leakage.

In addition, the moving part 22 is moved toward the extrusion port 20B of the molten metal supply chamber 20 to directly melt the molten metal 2 contained in the internal space 20A of the molten metal supply chamber 20. It is not intended to extrude through the extrusion port (20B) of the molten metal supply chamber 20, because it is a configuration for varying the volume of the internal space, so that the position of the extrusion port (20B) of the molten metal supply chamber 20, regardless Can be located. Therefore, the design of the molten metal supply chamber 20 can be made easier because there are no positional constraints such as the extrusion port 20B and the moving part 22 of the molten metal supply chamber 20.

The moving part 22 may be operated by power, and the moving speed of the moving part 22 may be easily adjusted, and the moving part 22 may be moved into the internal space 20A of the molten metal supply chamber 20 due to the moving of the moving part 22. It is connected to the hydraulic generating unit 30 so that the impact of all the molten metal 2 can be moved by the hydraulic pressure. Moving the structure by the hydraulic generator 30 and the hydraulic pressure is known a lot, including a hydraulic piston, so that the detailed description thereof will be omitted so as not to obscure the subject matter of the present invention.

On the other hand, although the extrusion port 20B of the molten metal supply chamber 20 can be formed anywhere, the molten metal 2 is formed by gravity by being formed on the lower surface or the lower side of the molten metal supply chamber 20 for controlling the extrusion pressure of the molten metal. It is more preferably located at the upper side of the molten metal supply chamber 20 so that the molten metal 2 can be extruded only by changing the volume of the molten metal supply chamber 20 except that it is supplied to the molding space 12 of the mold 10. It may be desirable. In addition, after the molten metal 2 is supplied to the molding space 12 of the mold 10, the molten metal 2 remaining in the inlet portion of the mold 10 may be easily recovered to the molten metal supply chamber 20 by gravity. Extruded opening 20B of the molten metal supply chamber 20 may be located above the molten metal supply chamber 20. That is, the extrusion opening 20B of the molten metal supply chamber 20 may be formed at an upper side of the upper surface or the side surface of the molten metal supply chamber 20 (that is, the circumferential surface between the upper surface and the lower surface of the molten metal supply chamber 20). have. More preferably, the molten metal 2 may be extruded by the volume change of the molten metal supply chamber 20 in a state in which the inner space 20A of the molten metal supply chamber 20 is filled with the molten metal 2 without an empty space. The extrusion hole 20B of the molten metal supply chamber 20 may be formed on an upper surface of the molten metal supply chamber 20.

The extrusion opening 20B of the molten metal supply chamber 20 may have various shapes. For example, as shown in the drawing, the cross section gradually decreases toward the mold 10 in the internal space 20A of the molten metal supply chamber 20. It can take shape.

The lower surface of the molten metal supply chamber 20 has a hot water outlet which is opened and closed by the valve 100 so that the molten metal 2 contained in the internal space 20A of the molten metal supply chamber 20 can be discharged to the outside instead of the mold 10. 20C may be formed. Here, the hot water outlet 20C of the molten metal supply chamber 20 is formed on the lower surface of the molten metal supply chamber 20 so that the molten metal 2 in the molten metal supply chamber 20 can be easily discharged by gravity.

Furthermore, in the pressure casting device of the present invention, the thermal insulation of the molten metal 2 in the internal space 20A of the molten metal supply chamber 20 and the molten metal material 4 are dissolved in the internal space 20A of the molten metal supply chamber 20. It may further include a heating unit 40 for applying heat to the molten metal supply chamber 20 to be the molten metal (2).

Therefore, the molten metal 2 is formed in the molten metal supply chamber 20 and is supplied to the molding space 12 of the mold 10, thereby forming the molten metal 2 and forming the molding space 12 of the mold 10. ) In the process of supplying the air to the air exposure of the molten metal 2 can be prevented, and thus the effect of preventing the air exposure as described above can be maximized. In addition, since the temperature control of the molten metal 2 may be performed by the heating unit 40 until the molten metal 2 is formed and supplied to the molding space 12 of the mold 10, temperature control of the molten metal 2 is easy. And it can prevent the heat loss of the molten metal (2). In addition, a separate device for making the molten metal 2 and an apparatus for conveying the molten metal 2 may not be provided.

Such a heating unit 40 can be a variety of configurations. In particular, as shown, the heating part 40 is installed in the outer chamber 42 having an inner space 42A in which the molten metal supply chamber 20 is embedded, and in the inner space 42A of the outer chamber 42, and is supplied with molten metal. The chamber 20 may include a heat source unit 44 for supplying a heat source so that the chamber 20 may be heated. In this case, thermal insulation is performed by the outer chamber 42, so that temperature management of the molten metal 2 may be easier, and heat loss of the molten metal 2 may be minimized. Here, the hole 42B is formed in the outer chamber 42 so that the guide part 26 of the molten metal supply chamber 20 may be penetrated therethrough for the operability of the moving part 22 of the molten metal supply chamber 20. Can be.

The outer chamber 42 may be formed of a material such as ceramic so as to have sufficient internal pressure and impact resistance, and may be reinforced by a protective member 41 installed outside the outer chamber 42.

The heat source unit 44 may have any structure as long as it can supply a heat source, and for example, may provide an electric heater. Since many methods for supplying a heat source such as an electric heater are well known, a detailed description thereof will be omitted in order not to obscure the subject matter of the present invention.

Furthermore, the heating part 40 may further include a filler 46 filling the inner space 42A of the outer chamber 42. Therefore, the impact on the heating part 40 can be absorbed by the filler 46. Filler 46 may be formed of a variety of materials, such as for shock absorption, for example, may be formed of a material such as ceramic powder.

In addition, the pressure casting device of the present invention is installed so as to be connected to the internal space (20A) of the molten metal supply chamber 20, the molten material for press-molding the molten material (4) into the internal space (20A) of the molten metal supply chamber 20 The supply unit 50 may further include.

Therefore, since the molten metal material 4 can be supplied to the internal space 20A of the molten metal supply chamber 20 without opening or removing the molten metal supply chamber 20, the molten metal supply chamber 20 can be opened or separated. Since the design and structure of the molten metal supply chamber 20 need not be simple and easy, the molten metal material 4 may be easily supplied. In addition, since the molten metal material 4 can be supplied without opening or closing the molten metal supply chamber 20, the molten metal 2 discharged into the inner space 20A of the molten metal material supply chamber 20 when the molten metal material 4 is supplied. Not only do not need to, but also to prevent the air exposure of the molten metal 2 in the internal space (20A) of the molten metal supply chamber 20, the internal space of the molten metal supply chamber 20 during the supply of the molten metal material (4) Temperature control of the molten metal 2 contained in 20A is possible. In addition, since the molten metal supply chamber 20 does not have to be opened or closed for supplying the molten material 4, the molten material 4 can be directly supplied and dissolved into the molten metal 2, thereby rapidly filling the molten metal 2. As a result, the molten metal 2 can be continuously supplied to the mold 10 to proceed with molding.

Such molten metal material supply unit 50 is possible in a variety of configurations.

In particular, the molten metal material 4 may be supplied in the form of a wire or a bar. In this case, since the molten metal material 4 in the form of a wire or bar can be pressurized and continuously supplied to the molten metal supply chamber 20, the molten metal material 4 can be supplied smoothly and quickly. In addition, since the molten material 4 in the form of a wire or bar may be supplied to the molten metal supply chamber 20 in small amounts, the molten metal material 4 supplied to the molten metal supply chamber 20 may be rapidly dissolved into the molten metal 2. The temperature control of the molten metal 2 in the molten metal supply chamber 20 may be easy. Here, the molten metal material 4 may be supplied in the form of a wire or bar having a smaller cross-sectional size than at least the extrusion hole 20B of the molten metal supply chamber 20 to supply a small amount.

In addition, the molten metal material supply unit 50 is a configuration corresponding to the molten metal material 4 in the form of a wire or bar, and guides the molten metal material 4 in the form of a wire or bar to the internal space 20A of the molten metal supply chamber 20. The molten metal material guide portion 52 and the molten metal material (52A) formed with a passage 52A having a size corresponding to the molten metal material 4 in the form of a wire or a bar and connected to the inner space 20A of the molten metal supply chamber 20 so as to be provided. 4) may include a molten metal moving part 54 for moving the molten metal material 4 to be press-fitted into the internal space 20A of the molten metal supply chamber 20 through the molten metal material guide part 52.

The molten metal material guide part 52 is possible in various configurations. For example, the molten metal material guide portion 52 may be installed through a hole formed in the molten metal supply chamber 20 and a hole formed in the external chamber 42 as shown.

The molten metal material guide part 52 may be connected anywhere with respect to the molten metal supply chamber 20, but is not affected by the weight of the molten metal 2 in the internal space 20A of the molten metal supply chamber 20, and the like. It may be connected to the upper surface or the side of the molten metal supply chamber 20 to prevent the molten metal (2) leakage by.

The molten metal moving part 54 may be configured to include a feed roller 54A for transferring the molten metal material 4 while being rotated by a driving force such as a motor as shown, and various other configurations are possible. Here, since it is known to move by pressing the wire or bar (bar), more detailed description is omitted in order not to obscure the subject matter of the present invention.

On the other hand, the pressurized casting apparatus according to the present invention by the central control unit (not shown) such as a CPU by connecting and controlling the moving part 22, the heating part 40, the molten metal material supply unit 50 of the molten metal supply chamber 20 When the molten metal 2 contained in the internal space 20A of the molten metal supply chamber 20 is extruded by the moving part 22 of the molten metal supply chamber 20, the molten material 4 is supplied and heated to form a molten metal supply chamber ( The molten metal 2 can be filled by the amount extruded by the moving part 22 of 20).

Looking at the operation of the pressure casting device according to the present invention configured as described above is as follows.

As shown in FIG. 1, when the molten metal 2 is not filled in the internal space 20A of the molten metal supply chamber 20, the volume of the internal space 20A of the molten metal supply chamber 20 is maximum. The moving part 22 of the molten metal supply chamber 20 is retracted from the internal space 20A of the molten metal supply chamber 20 so that the molten metal material 4 is transferred to the molten metal supply chamber through the molten metal material guide part 52. It supplies to 20 A of internal spaces of (20).

The molten metal material 4 supplied to the molten metal supply chamber 20 may be dissolved into the molten metal 2 by the heating part 40. At this time, the temperature of the molten metal 2 may be determined according to the material of the molten metal 2, for example, and may be managed at about 600 to 1600 ° C. After all of the molten metal material 4 is supplied in an amount necessary to fill the molten metal 2, the molten material 4 supplied to the molten metal supply chamber 20 is melted into the molten metal 2 by the heating part 40, or The raw material 4 may be supplied in small amounts and dissolved in the molten metal 2 at the same time.

When the molten metal 2 is filled in the internal space 20A of the molten metal supply chamber 20 without empty space by supplying and dissolving the molten metal material 4, the molten metal supply chamber 20 as shown in FIG. As the moving part 22 moves forward toward the internal space 20A of the molten metal supply chamber 20, the volume of the molten metal supply chamber 20 may be changed, that is, reduced. At this time, the moving part 22 of the molten metal supply chamber 20 may be moved at a predetermined pressure according to the material of the molten metal 2, the extrusion speed of the molten metal 2, and the like, and may be moved at a pressure of about 1 to 5 atmospheres, for example. have.

Then, as the volume of the molten metal supply chamber 20 decreases, the molten metal 2 contained in the internal space 20A of the molten metal supply chamber 20 passes through the extrusion hole 20B of the molten metal supply chamber 20. 10) may be extruded into the forming space (12).

In this way, after the molten metal 2 is completely filled in the molding space 12 of the mold 10 and the moving part 22 of the molten metal supply chamber 20 is retracted again, the molding space 12 of the mold 10 is removed. The remaining molten metal 2 filled in may be recovered to the molten metal supply chamber 20 again.

Here, when extrusion of the molten metal 2 is performed while the internal space 20A of the molten metal supply chamber 20 is filled only with the molten metal 2 without empty space, oxides of the molten metal 2 are generated by air or the like, and a release agent is mixed. Etc., the molten metal 2 contained in the inner space 20A of the molten metal supply chamber 20 may be extruded without slack due to the volume change of the molten metal supply chamber 20, thereby preventing the occurrence of bubbles. have.

In addition, the moving part 22 of the molten metal supply chamber 20 does not directly press the molten metal 2 toward the extrusion port 20B of the molten metal supply chamber 20, but the moving part of the molten metal supply chamber 20. Since the 22 is moved into the molten metal 2 contained in the internal space 20A of the molten metal supply chamber 20, the molten metal 2 is affected by the impact caused by the movement of the moving part 22 of the molten metal supply chamber 20. ) Does not rock.

In addition, since the extrusion pressure of the molten metal 2 can be sufficiently formed by the volume change of the molten metal supply chamber 20, as a material of the molten metal 2, aluminum (Al) or magnesium (Mg) having a relatively small specific gravity, as well as In addition, copper (Cu), iron (Fe), stainless steel (SUS), etc., which have a relatively high specific gravity, are also possible.

In addition, the moving part 22 of the molten metal supply chamber 20 does not directly press the molten metal 2 toward the extrusion port 20B of the molten metal supply chamber 20 without causing a change in the volume of the molten metal supply chamber 20. Since the extrusion pressure of the molten metal 2 can be sufficiently formed and the instantaneous pressure rise is possible, the molten metal 2 can be extruded by the molding of the mold 10 quickly and quickly without being slack. Defects due to unfilled) can be prevented, and the structure of the molded article can be densely formed, thereby molding a molded article of excellent quality.

In addition, since the moving part 22 is not a structure in which the whole is submerged in the high temperature molten metal 2 like the guide part 26, only a part thereof contacts the high temperature molten metal 2, thereby ensuring sufficient durability. Can be.

In addition, by controlling the moving speed of the moving part 22 of the molten metal supply chamber 20, it is possible to easily manage the extrusion pressure of the molten metal 2.

In addition, since the molten metal 2 is directly extruded from the molten metal supply chamber 20 to the molding space 12 of the mold 10, the temperature reduction of the molten metal 2 during extrusion of the molten metal 2 is not large. The temperature deviation of the molten metal 2 in the molding space 12 of the) can be prevented, whereby a molded article of excellent quality can be obtained.

The pressure casting device according to the present invention having the above characteristics can use various molten metals 2 without being particularly concerned with the specific gravity of the molten metal 2, the temperature of the molten metal 2, and the like, and thus can form molded articles of excellent quality. It can be useful for molding various shaped articles. For example, it may be suitable for forming a rotor (or some component) of a motor made of relatively high specific gravity (Cu).

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

2; Molten metal 4; Molten material
10; Template 12; Molding space
20; Molten metal supply chamber 20A; Interior space
20B; Extrusion port 20C; Tap
22; Moving part 24; [0035]
25; Main body 26; Guide part
40; Heating section 42; Outer chamber
44; Heat source part 50; Heating
52; Molten material guide part

Claims (23)

A mold having a molding space in which a molten metal is supplied and molding is formed;
The inner space containing the molten metal supplied to the molding space of the mold is formed to be changeable in volume, and the inner space and the inner molten metal are extruded into the molding space into the mold by the volume change of the inner space. A molten metal supply chamber in which an extrusion port is formed to connect the molding space of the mold in a sealed state;
Pressurized casting apparatus comprising a. The method according to claim 1,
The molten metal casting chamber is characterized in that for extruding the molten metal, a part of the molten metal casting chamber is formed as a movable portion movable toward the inner space of the molten metal supply chamber so as to reduce the volume of the inner space of the molten metal. The method according to claim 2,
The fixing part of the molten metal supply chamber forming the molten metal supply chamber together with the moving part,
A main body portion having an opening formed at a position corresponding to the moving portion;
It is installed through the opening of the main body portion spaced apart from the extrusion port of the molten metal supply chamber, characterized in that it comprises a guide portion formed therein corresponding to the moving portion is formed so that the moving portion is installed to be relatively movable Pressurized casting device. The method according to claim 3,
Pressure casting apparatus characterized in that the extrusion port of the molten metal supply chamber is formed in the main body. The method according to claim 3,
The guide portion is pressure casting device, characterized in that formed longer than the thickness of the body portion. The method according to any one of claims 2 to 5,
The moving part of the molten metal supply chamber, the pressure casting device, characterized in that connected to the hydraulic generating unit to be movable by the hydraulic pressure. The method according to any one of claims 1 to 5,
The moving part of the molten metal supply chamber is located on the upper surface or the side of the molten metal casting chamber. The method according to any one of claims 2 to 5,
The extrusion port of the molten metal supply chamber is formed on the upper surface or the side of the molten metal supply chamber, the mold is characterized in that the mold is installed so as to be connected to the surface formed with the extrusion port of the molten metal supply chamber. The method according to any one of claims 1 to 5,
Pressure casting device, characterized in that the hot water supply opening is formed on the lower surface of the molten metal supply chamber by a valve. The method according to any one of claims 1 to 5,
And a heating unit for applying heat to the molten metal supply chamber so that the insulation of the molten metal in the inner space of the molten metal supply chamber and the material of the molten metal are dissolved in the inner space of the molten metal supply chamber to form a molten metal. Pressurized casting device. The method according to claim 10,
The heating unit includes an external chamber having an internal space in which the molten metal supply chamber is embedded, and a heat source unit installed in the internal space of the external chamber and supplying a heat source to heat the molten metal supply chamber. Device. The method of claim 11,
The heating unit further comprises a filling material for filling the inner space of the outer chamber. The method of claim 12,
The filling material is a pressure casting device, characterized in that formed of a ceramic material. The method according to claim 10,
And a molten metal material supply unit connected to the inner space of the molten metal supply chamber to press the molten metal material into the inner space of the molten metal supply chamber. The method according to claim 14,
The molten material is supplied in the form of a wire or bar,
The molten metal material supply unit is connected to the inner space of the molten metal supply chamber to guide the molten metal material in the wire or bar shape to the internal space of the molten metal supply chamber and has a passage corresponding to the molten material in the shape of the wire or bar. And a molten metal material guide part for moving the molten metal material so that the molten metal material can be pressed into the inner space of the molten metal supply chamber through the molten metal material guide part. The method according to claim 15,
The molten metal material is a pressure casting device, characterized in that the wire or bar shape having a smaller cross-sectional size than the extrusion port of the molten metal supply chamber. The method according to claim 14,
When the molten metal contained in the inner space of the molten metal supply chamber is extruded by the molten metal supply chamber, the molten material is supplied and heated so that the molten metal is filled by the amount extruded by the molten metal of the molten metal supply chamber. And a central control unit for cooperatively controlling the moving unit, the heating unit, and the molten metal material supply unit of the molten metal supply chamber. Melting furnace characterized in that the internal space containing the molten metal is formed to be able to change the volume, the molten metal supply chamber is formed on one side of the extrusion port for extruding the molten metal in the internal space by the volume change of the internal space. The method according to claim 18,
The molten metal supply chamber is characterized in that for the extrusion of the molten metal, a portion is formed as a moving portion movable toward the inner space of the molten metal supply chamber so as to reduce the volume of the inner space of the molten metal supply chamber. The method according to claim 19 or 20,
And an outer chamber having an inner space in which the molten metal supply chamber is embedded, and a heat source unit installed in the inner space of the outer chamber and supplying a heat source to heat the molten metal supply chamber. The method of claim 20,
Melting furnace further comprises a filling material for filling the inner space of the outer chamber. The method of claim 20,
And a molten metal material supply unit connected to the inner space of the molten metal supply chamber to press the molten metal material into the inner space of the molten metal supply chamber. The method according to claim 22,
The molten material is supplied in the form of a wire or bar,
The molten metal material supply unit is connected to the inner space of the molten metal supply chamber to guide the molten metal material in the wire or bar shape to the internal space of the molten metal supply chamber and has a passage corresponding to the molten material in the shape of the wire or bar. And a molten metal material moving part configured to move the molten metal material such that the molten metal material guide part is formed, and the molten metal material is pressed into the inner space of the molten metal supply chamber through the molten metal material guide part.

Images