JPH10272554A - Moldless casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fining of material structure while avoiding the effect of cooling from a mold, to improve the strength while orienting the solidified structure in the perpendicular direction to the thickness and further, to simplify a casting process by producing a three-dimensional casting material while laminating molten metal on a base plate without using the mold. SOLUTION: A closed chamber 2 is arranged and incombustible gas is filled up while flowing into and out from the inner part of the closed chamber 2, and a melting furnace 3 is arranged at the upper side in the inner part of the closed chamber 2 and a molten metal flowing-out hole 3 is formed at the lower end of the melting furnace 3. The base plate 4 laminating the molten metal flowed out from the melting furnace 3 is arranged at the lower side of the melting furnace 3 in the inner part of the closed chamber 2, and the melting furnace 3 and the base plate 4 are arranged so as to be freely shifted in relatively three dimensional direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moldless molding apparatus for producing a three-dimensionally shaped object while laminating a melt of a plastic material such as metal or plastic on a substrate without using a mold.

[0002]

2. Description of the Related Art In general, in the production of castings, a wooden mold is used as a base of the casting with wood or the like, and a sand mold or a mold is formed based on the wooden mold, and the molten metal is cast into a mold such as a sand mold or a mold. The casting has been manufactured by the injection.

[0003]

However, the formation of the solidified structure of the casting is affected by the cooling from the mold, and there is a problem in the miniaturization of the metal structure. There is a problem that only a material having a solidified structure can be obtained.

The present invention has been made in view of the above problems and has been made in order to solve the problems. It is an object of the present invention to provide a method of laminating a molten metal on a substrate without using a mold. By producing a three-dimensional shaped object,
Moldless molding that avoids the effect of cooling from the mold to increase the fineness of the material structure, and furthermore, orients the solidification structure in the direction perpendicular to the wall thickness to increase strength and further simplifies the molding process. It is to provide a device.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a closed chamber is provided, and the inside of the closed chamber is filled with incombustible gas while flowing in and out. A melting furnace is provided on the upper side, a molten metal outlet is formed at the lower end of the melting furnace, and a substrate on which the molten metal flowing out of the melting furnace is laminated is provided below the melting furnace inside the closed chamber, and the melting furnace and the substrate are provided. Are relatively movable in the three-dimensional direction. Here, the molten metal may be caused to flow out of the molten metal outflow port of the melting furnace using the gas pressure.

According to a third aspect of the present invention, a closed chamber is provided,
The incombustible gas is filled while flowing into and out of the closed chamber, a metal arc discharge melting furnace is provided at an upper side of the closed chamber, and a molten metal outlet is formed at a lower end of the metal arc discharge melting furnace. Means for providing a substrate on which the molten metal flowing out of the metal arc discharge melting furnace is stacked below the metal arc discharge melting furnace, and providing the metal arc discharge melting furnace and the substrate relatively movably in three-dimensional directions. Consisting of

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the invention shown in the drawings.

[Embodiment 1] Here, FIG. 1 is a perspective view of a molding apparatus without a mold, and FIG. 2 is a block diagram under computer control.

In the figure, a moldless molding apparatus 1 is an apparatus capable of manufacturing a three-dimensional molded object while laminating a melt of a plastic material a such as metal or plastic on a substrate without using a mold. A closed chamber 2 filled with incombustible gas, a melting furnace 3 provided on the upper side inside the closed chamber 2,
It is composed of a substrate 4 and the like provided below the melting furnace 3.

The closed chamber 2 is formed, for example, in a shape in which a cylindrical shape is arranged upright, and the inside is a closed chamber.
Inside this, a three-dimensional object is formed. The vertical cylindrical side peripheral surface is formed of a transparent body such as glass or plastic, so that the inside can be seen from the outside.

One end of an inflow hose (not shown) for flowing incombustible gas into the closed chamber 2 is connected to the closed chamber 2.
An inflow connection port 2a for connecting one end of an inflow hose is attached to an upper side of the side peripheral surface of the closed chamber 2. The other end of the inflow hose is connected to a non-combustible gas supply tank 5 for supplying a non-combustible gas such as argon gas.

The non-combustible gas stored in the non-combustible gas supply tank 5 is supplied to the inside of the closed chamber 2 through the inflow hose and the inflow connection port 2a under the control of a computer 9 described later. Is filled with nonflammable gas.

One end of an outflow hose (not shown) for letting out the incombustible gas inside is connected to the closed chamber 2, and one end of the outflow hose is connected to a lower side of the side peripheral surface of the closed chamber 2. Outflow connection port 2b for
Ventilation of noncombustible gas inside is achieved.

The non-combustible gas, such as argon gas, which is supplied through the inflow hose and the inflow connection port 2a and fills the inside of the closed chamber 2 is supplied to the inside of the closed chamber 2 through the outflow connection port 2b and an outflow hose (not shown). And functions to prevent the molten metal flowing out of the melting furnace 3 from igniting inside the closed chamber 2 or from being in a high temperature and high pressure state.

The melting furnace 3 is for melting a plastic material a such as a metal or a plastic which is a material of a three-dimensionally shaped object into a molten state. When the material is a metal, for example, a high frequency induction electric melting furnace is used. used. When the material is a non-metal such as plastic, for example, an electric heater type is used as the melting furnace 3. The melting furnace 3 has an upright columnar shape, and has a cylindrical central portion provided with a core inside for accommodating a plastic material a such as metal or plastic to be melted.

An opaque quartz tube 3a, which constitutes a part of the melting furnace 3, is mounted inside the furnace core.
A circular hole is vertically formed in the center of the melting furnace 3 to mount the opaque quartz tube 3a. The opaque quartz tube 3a is attached so as to penetrate vertically through the circular hole of the melting furnace 3.

When a high-frequency induction electric melting furnace is used as the melting furnace 3, a coil for passing an alternating current is wound around a circular hole inside the core of the melting furnace 3, and the coil has an alternating current. When the metal material is placed in the magnetic field, an induced current flows through the metal material by electromagnetic induction, and the metal material is heated and melted by Joule heat. When an electric heater system is used for the melting furnace 3, a coil for the electric heater is wound around a circular hole inside the core of the melting furnace 3,
When the coil is energized, the coil is heated to melt the material inside. The heating of the melting furnace 3 is controlled by a computer 9 described later.

Opaque quartz tube 3 constituting a part of melting furnace 3
The inside of a is filled with a plastic material a such as a columnar metal or plastic to be melted. Opaque quartz tube 3a attached to the circular hole at the center of melting furnace 3 in a penetrating state
Has upper and lower ends protruding from the upper and lower surfaces of the melting furnace 3, respectively.

The lower end of the opaque quartz tube 3a projecting downward from the lower surface of the melting furnace 3 has a downwardly frustoconical shape, and the lower end has a plasticity such as metal or plastic melted therein. A molten metal outlet 3b having a small hole, for example, having a diameter of 0.4 mm, for discharging the material a downward is formed.

At the upper end of an opaque quartz tube 3a projecting upward from the upper surface of the melting furnace 3, a molten metal or plastic material such as plastic is filled with a molten metal outlet 3 having a small hole at the lower end.
One end of a gas pressure injection hose 6 for injecting a gas pressure into the inside of the opaque quartz tube 3a is connected to force the gas to flow out of the opaque quartz tube 3a using the gas pressure.

The other end of the gas pressure injection hose 6 extends outside from the ceiling 2c of the upper sealed chamber 2 and is connected to a gas pressure supply tank 6a. The gas pressure supply tank 6a is controlled by a computer 9 to be described later to supply gas pressure through the gas pressure injection hose 6 to the opaque quartz tube 3a of the melting furnace 3.
And the molten metal flows out from the molten metal outlet 3b at the lower end of the opaque quartz tube 3a.

The melting furnace 3 is placed on a support base 7 installed inside the closed chamber 2. The support base 7 is a closed chamber 2
Is mounted in a fixed state or a movable state. The support base 7 is mounted in a fixed state when the substrate 4 is provided so as to be movable up and down and in a plane.

The support pedestal 7 has a thick rectangular shape, and a cylindrical disk 7a is attached downward at the center of the lower surface thereof. A downwardly frusto-conical hole is formed in the cylindrical disk 7a, through which the lower end of an opaque quartz tube 3a attached to the center of the melting furnace 3 penetrates, and a part of the hole extends downward. It protrudes.

The substrate 4 is a place where the molten metal flowing downward from the melting furnace 3 is laminated to form a three-dimensionally shaped object, and is formed of, for example, a circular copper substrate. The circular periphery of the substrate 4 composed of a circular copper substrate is formed so as to be slightly inclined upward.
A gentle wall surface is formed all around so that the molten metal flowing out does not flow out from above the substrate 4.

In the center of the lower surface of the circular substrate 4, a closed chamber 2 is provided.
The upper end of the elevating rotary shaft 8 extending through the bottom surface 2d is connected. The elevating rotary shaft 8 is configured to be able to move up and down in the vertical direction, and is also rotatable around the horizontal.
The substrate 4 is vertically movable and rotatable by the vertically rotating shaft 8.

When the melting furnace 3 above the substrate 4 is fixed and mounted inside the closed chamber 2, the elevating rotary shaft 8 is also movable in the horizontal plane direction. The lift shaft 8 is movable in the three-dimensional direction with respect to the melting furnace 3, in addition to the lift and the rotation.

The elevating rotary shaft 8 extends downward through the bottom surface 2b of the sealed chamber 2, and is connected to the lower elevating device 8a and the motor 8b. When the elevating rotary shaft 8 is also movable in the horizontal plane direction, the lower part of the elevating rotary shaft 8 extending downward is interlocked and connected to the elevating device 8a, the motor 8b, and the slide mechanism 8c that slides in the horizontal plane direction. ing. These lifting device 8a and motor 8
b and the slide mechanism 8c are controlled by a computer 9 described later.

Since the substrate 4 is connected to the elevating rotary shaft 8, the substrate 4 is also movable three-dimensionally with respect to the melting furnace 3 located above the substrate. When the substrate 4 is moved in the three-dimensional direction by the elevating rotary shaft 8, the molten metal flowing out and falling from the molten metal outlet 3 b of the melting furnace 3 is laminated on the substrate 4, and a three-dimensional shaped object having an arbitrary shape is formed. Can be manufactured.

The computer 9 includes the melting furnace 3, the non-combustible gas supply tank 5, the gas pressure supply tank 6a, and the lifting device 8
a, the motor 8b and the slide mechanism 8c are controlled to control the molding apparatus 1 without a mold. The molten metal is moved from the molten metal outlet 3b of the melting furnace 3 while moving the substrate 4 up and down, rotating and moving in a horizontal plane direction. It flows out and falls on the substrate 4 to be formed and is laminated in an arbitrary shape, thereby producing a three-dimensional shaped object having an arbitrary shape.

Next, the operation based on the configuration of the above embodiment of the present invention will be described below. The closed chamber 2 is opened, a plastic material a such as metal or plastic is put in the opaque quartz tube 3 a of the melting furnace 3, and the closed chamber 2 is closed. Also,
Information necessary for producing a desired three-dimensionally shaped object is input to the computer 9 to operate the molding apparatus 1 without a mold.

When the molding apparatus 1 without a mold is operated, the melting furnace 3, the non-combustible gas supply tank 5, the gas pressure supply tank 6a, the elevating device 8a, the motor 8b, the slide mechanism 8c, etc. are operated according to a command from the computer 9. .

That is, when a high frequency induction electric melting furnace is used for the melting furnace 3 according to a command from the computer 9, an alternating current flows through the coil of the melting furnace 3 and an alternating magnetic field is generated by the alternating current, so that the electromagnetic induction action is performed. As a result, an induced current flows through the metal material placed in the opaque quartz tube 3a, and the metal material is heated and melted by Joule heat. When an electric heater system is used for the melting furnace 3, electricity flows through the coil for the electric heater of the melting furnace 3 according to a command from the computer 9, and the coil is heated to make the internal non-metallic material such as plastic. Is dissolved.

A non-combustible gas is supplied from the non-combustible gas supply tank 5 into the closed chamber 2 in accordance with a command from the computer 9. The non-combustible gas flows through the inflow hose, flows into the closed chamber 2 from the inflow connection port 2a, and expels air inside the closed chamber 2 from the outflow connection port 2b to the outside.
Is filled with nonflammable gas.

When the melting furnace 3 is heated and the plastic material a such as metal or plastic inside the opaque quartz tube 3a is melted, it flows from the gas pressure supply tank 6a through the gas pressure injection hose 6 according to a command from the computer 9, and becomes opaque. Gas pressure is sent into the quartz tube 3a, and the plastic material a, such as metal or plastic, melted by the gas pressure is pressed toward the lower end of the opaque quartz tube 3a. The pressed melted plastic material a starts to flow downward from the melt outlet 3b at the lower end of the opaque quartz tube 3a and fall.

Plastic material a dissolved from molten metal outlet 3b
Starts flowing out and falls, the elevating device 8a, the motor 8b, and the slide mechanism 8c are operated by a command from the computer 9 to move the substrate 4 through the elevating rotary shaft 8 to the molten metal outlet 3b of the melting furnace 3. The descent, rotation, and movement in the three-dimensional direction of the horizontal plane are performed.

At the start of operation, the substrate 4 is located at the highest position, and the molten metal outlet 3b of the melting furnace 3 and the substrate 4
And the vertical distance between them is small, and the molten metal of the plastic material a flows out from the molten metal outlet 3b and is stacked on the substrate 4, so that the substrate 4 gradually descends, and the molten metal outlet 3b and the substrate 4
The substrate 4 descends so that the vertical distance from the surface of the plastic material a that is laminated and hardened on the substrate 4 does not become too large or too close to the surface, and always maintains a constant vertical space.

Then, on the moving substrate 4, the molten metal of the plastic material a which has flowed out and dropped from the molten metal outlet 3b has a desired size.
The three-dimensional shape is gradually laminated and hardened, and a desired three-dimensional shaped object is manufactured by a plastic material a such as metal or plastic.

[Embodiment 2] FIG. 3 is a perspective view of a molding apparatus without a mold, and FIG. 4 is a block diagram controlled by a computer.

In the figure, a moldless molding apparatus 11 is used to laminate a molten metal on a substrate without using a mold.
A closed chamber 12 filled with nonflammable gas, a metal arc discharge melting furnace 3 provided on an upper side inside the closed chamber 12, and a metal arc discharge melting furnace 3 which can manufacture a three-dimensional shaped object. It is composed of a substrate 14 and the like provided below.

The closed chamber 12 is formed, for example, in a shape in which a cylindrical shape is arranged upright, and the inside is a closed chamber in which a three-dimensional object is formed. The vertical cylindrical side peripheral surface is formed of a transparent body such as glass or plastic, so that the inside can be seen from the outside.

One end of an inflow hose (not shown) for flowing incombustible gas into the closed chamber 12 is connected to the upper end of the side peripheral surface of the closed chamber 12 for connecting one end of the inflow hose. Are connected. The other end of the inflow hose is connected to a non-combustible gas supply tank 15 for supplying a non-combustible gas such as argon gas.

The noncombustible gas stored in the noncombustible gas supply tank 15 is supplied to the inside of the closed chamber 12 through the inflow hose and the inflow connection port 12a under the control of a computer 19 described later. Is filled with nonflammable gas.

One end of an outflow hose (not shown) for letting out the nonflammable gas inside is connected to the closed chamber 12, and one end of the outflow hose is connected to a lower side of the side peripheral surface of the closed chamber 12. Outlet 12b is provided for ventilation of the internal noncombustible gas.

The non-combustible gas, such as argon gas, which is supplied through the inflow hose and the inflow connection port 12a and fills the inside of the sealed chamber 12, is supplied to the outflow connection port 12b.
An environment is set such that arc discharge is easily generated by being discharged from the inside of the closed chamber 12 through an outflow hose (not shown), and the molten metal flowing out of the metal arc discharge melting furnace 13 ignites inside the closed chamber 12 or has a high temperature and a high pressure. It fulfills the function of preventing a state.

The metal arc discharge melting furnace 13 uses an arc discharge to melt a metal material b, which is a material of a three-dimensional molded object, to a molten metal state, and adjusts the temperature of the molten metal to a temperature suitable for melting. For this purpose, an auxiliary heater 13e such as a high-frequency induction heating device is attached. The metal arc discharge melting furnace 13 is made of a conductive material, and discharges through the molten metal or directly with the metal material b to melt the metal material b. For example, a welding wire is used as the metal material b. The arc discharge of the metal arc melting furnace 13 is controlled by a computer 19 described later.

The metal arc discharge melting furnace 13 has a downwardly conical shape, and has an arc discharge portion 13a which is depressed in a mortar shape. This arc discharge part 13a
Then, the arc discharge is performed, and the tip of the metal material b made of, for example, a welding wire is melted to be in a molten metal state and dripped. At the lower end side of the arc discharge part 13a of the metal arc discharge melting furnace 13, there is formed a molten metal outlet 13b having a small hole having a diameter of, for example, about 0.4 mm, for flowing out the molten metal material b downward. .

The welding wire serving as the metal material b to be melted is held by a holder 16 whose upper end is supported on the upper inside of the closed chamber 2. When the tip of the welding wire melts, the holder 16 is lowered by that amount to maintain a distance at which arc discharge occurs at the tip of the welding wire. This adjustment is controlled by a computer 19. One end of a holder wire 16a is connected to the holder 16,
The other end of the holder wire 16a is the ceiling 12c of the closed chamber 12 above.
, And is connected to the welding machine 13c.

The other end of the arc wire 13d having one end connected to the metal arc discharge melting furnace 13 is connected to the welding machine 13c. The arc wire 13d extends outside from the ceiling 12c of the closed chamber 12 similarly to the holder wire 16a, and
c. The welding machine 13c is controlled by a computer 19 described later.

The metal arc discharge melting furnace 13 is supported on a support base 17 installed inside the closed chamber 12.
The support base 17 is attached to the inside of the closed chamber 12 in a fixed state or a movable state. The support base 17 is mounted in a fixed state when the substrate 14 is provided so as to be movable up and down and movable in a plane.

The support pedestal 17 has a thick rectangular shape, and has a cylindrical disk 17a facing downward at the center of its lower surface.
Is installed. The cylindrical disk 17a is provided with a downwardly frusto-conical hole, through which a lower portion of the metal arc discharge melting furnace 13 penetrates and a portion of which protrudes downward.

The substrate 14 is a place where the molten metal flowing downward from the metal arc discharge melting furnace 13 is laminated to form a three-dimensional molded object, and is formed of, for example, a circular copper substrate. The circular periphery of the substrate 14 made of a circular copper substrate is formed to be slightly inclined upward, and the molten metal flowing out of the metal arc discharge melting furnace 13 onto the lower substrate 14 flows out of the substrate 14. A gentle wall surface that does not occur is formed all around.

At the center of the lower surface of the circular substrate 14, the upper end of a vertically rotating shaft 18 extending through the bottom surface 12d of the sealed chamber 12 is connected. The elevating rotary shaft 18 is vertically movable and rotatable about a horizontal plane. The substrate 14 is vertically movable and rotatable by the elevating rotary shaft 18.

When the metal arc discharge melting furnace 13 above the substrate 14 is fixedly mounted inside the closed chamber 12, the elevating rotary shaft 18 is also movable in the horizontal plane direction. . The lift shaft 18 is movable in the three-dimensional direction with respect to the metal arc discharge melting furnace 13, in addition to the above-mentioned lift and rotation and rotation.

The elevating rotary shaft 18 is connected to the bottom surface 12 b of the closed chamber 12.
Extending downward through the lower elevating device 18
a and the motor 18b. When the lifting / lowering rotating shaft 18 is also movable in the horizontal plane direction, the lower portion of the vertically extending / lowering rotating shaft 18 is linked to the lifting / lowering device 18a and the motor 18b and the slide mechanism 18c that slides in the horizontal plane direction. ing. These lifting device 18a, motor 18b and slide mechanism 18c
Is controlled by a computer 19 described later.

Since the substrate 14 is connected to the elevating rotary shaft 18, the substrate 14 is also movable three-dimensionally with respect to the metal arc discharge melting furnace 13 located above the substrate 14. The substrate 14 is moved by the elevating rotary shaft 18.
Moves in the three-dimensional direction, the molten metal flowing out and falling from the molten metal outlet 13b of the metal arc discharge melting furnace 13 is laminated on the substrate 14, and a three-dimensional shaped object having an arbitrary shape can be manufactured. It is.

A computer 19 controls the molding apparatus 11 without a mold by controlling the metal arc discharge melting furnace 13, the auxiliary heater 13e, the nonflammable gas supply tank 15, the elevating device 18a, the motor 18b and the slide mechanism 18c. It is. Then, under the control of the computer 19, the molten metal flows out and falls from the molten metal outlet 13 b of the metal arc discharge melting furnace 13 onto the moving substrate 14 while moving the substrate 14 up and down, rotating, and moving in the horizontal plane direction, and has an arbitrary shape. To produce a three-dimensionally shaped object having an arbitrary shape.

Next, the operation based on the configuration of the embodiment of the present invention will be described below. The closed chamber 12 is opened, and the distal end side of the metal material b made of a welding wire is attached to the arc discharge portion 13a of the metal arc discharge melting furnace 13 so as to approach a state where arc discharge occurs, and the closed chamber 12 is closed. Also,
Information necessary for manufacturing a desired three-dimensionally shaped object is input to the computer 19, and the moldless modeling apparatus 11 is operated.

When the molding apparatus 11 without a mold is operated, the metal arc discharge melting furnace 13, the non-combustible gas supply tank 15, the elevating apparatus 18a,
The motor 18b, the slide mechanism 18c, etc. operate.

That is, according to a command from the computer 19, an arc is generated in the arc discharge portion 13a of the metal arc discharge melting furnace 13, and the tip of the metal material b made of the welding wire is melted and dropped. It starts flowing out and falling down from the molten metal outlet 13b on the lower end side of the portion 13a.

Further, a non-combustible gas is supplied from the non-combustible gas supply tank 15 into the closed chamber 12 by a command from the computer 19. The noncombustible gas flows through the inflow hose, flows into the closed chamber 12 from the inflow connection port 12a, expels the air inside the closed chamber 12 out of the outflow connection port 12b, and enters the noncombustible gas into the closed chamber 12. Is full.

When the melted metal starts flowing out of the molten metal outlet 3b and falls, the elevating device 18a, the motor 18b, and the slide mechanism 18c are operated by a command from the computer 19 to lower the substrate 14 via the elevating rotary shaft 18. , Rotate, and move in the horizontal plane direction.

At the start of the operation, the substrate 14 is located at the highest position, the vertical gap between the molten metal outlet 13b of the metal arc discharge melting furnace 13 and the substrate 14 is small, and the metal is discharged from the molten metal outlet 13b. Of molten metal flows out and falls and the substrate 14
Therefore, the substrate 14 descends gradually, so that the vertical gap between the molten metal outlet 13b and the surface of the metal laminated on the substrate 14 does not always become too far or too close to each other. The substrate 14 descends so as to maintain a constant vertical interval.

On the moving substrate 14, the molten metal flowing out of the molten metal outlet 13b is gradually laminated in a desired three-dimensional shape and hardened, and the desired three-dimensional shape is formed by the metal material b. Is manufactured.

The present invention is not limited to the above embodiment of the present invention, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

[0065]

As is apparent from the above description, according to the moldless molding apparatus according to the first aspect of the present invention, a three-dimensional casting is formed while laminating a molten metal on a substrate without using a mold. As a result, it is possible to avoid the influence of cooling from the mold, and it is possible to increase the fineness of the structure of a plastic material such as metal or plastic.
In addition, since the solidified structure can be oriented in a direction perpendicular to the thickness, the strength of the casting can be increased. In addition to this, the mold can be omitted, so that the mold manufacturing process can be omitted altogether, the time can be greatly reduced, and the molding process can be simplified.

Further, when the molten metal is caused to flow out of the molten metal outlet by utilizing the gas pressure as in the second aspect of the present invention, the molten metal is not clogged at the molten metal outlet.
The molten metal outlet can reliably flow out and drop the molten metal.

Further, according to the molding apparatus without a mold according to the third aspect of the present invention, it is possible to form a three-dimensional casting by laminating the molten metal on the substrate without using a mold by using arc discharge. Thereby, it is possible to avoid the influence of cooling from the mold, and it is possible to enhance the miniaturization of the metal structure. In addition, since the solidified structure can be oriented in a direction perpendicular to the thickness, the strength of the casting can be increased. In addition to this, the mold can be omitted, so that the mold manufacturing process can be omitted altogether, the time can be greatly reduced, and the molding process can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molding device without a mold according to Embodiment 1 of the present invention.

FIG. 2 is a computer-controlled block diagram showing Embodiment 1 of the present invention.

FIG. 3 is a perspective view of a molding device without a mold according to Embodiment 2 of the present invention.

FIG. 4 is a computer-controlled block diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 [Embodiment-1] 1 Moldless molding apparatus 2 Sealed chamber 2a Inflow connection port 2b Outflow connection port 2c Ceiling 2d Bottom surface 3 Melting furnace 3a Opaque quartz tube 3b Melt outlet 4 Substrate 5 Incombustible gas supply tank 6 Gas pressure injection Hose 6a Gas pressure supply tank 7 Support pedestal 7a Cylindrical disk 8 Elevating rotary shaft 8a Elevating device 8b Motor 8c Slide mechanism 9 Computer a Plastic material [Embodiment-2] 11 Moldless molding device 12 Sealed chamber 12a Inlet connection port 12b Outflow Connection 12c Ceiling 12d Bottom 13 Metal arc discharge melting furnace 13a Arc discharge part 13b Melt outlet 13c Welder 13d Arc wire 13e Auxiliary heater 14 Substrate 15 Nonflammable gas supply tank 16 Holder 16a Holder wire 17 Support pedestal 17a Cylindrical disk 18 Elevating rotary shaft 18a Elevating device 18b Motorー 18c Slide mechanism 19 Computer b Metal material

Claims (3)

[Claims] 1. A closed chamber is provided, and a non-flammable gas is filled into the closed chamber while flowing in and out, a melting furnace is provided at an upper side of the closed chamber, and a molten metal outlet is formed at a lower end of the melting furnace. ,
A mold is provided below the melting furnace in the closed chamber, on which a substrate on which the molten metal flowing out of the melting furnace is laminated is provided, and the melting furnace and the substrate are relatively movable in a three-dimensional direction. Modeling equipment. 2. The molding apparatus without a mold according to claim 1, wherein the molten metal is caused to flow out of the molten metal outlet using a gas pressure. 3. A closed chamber is provided, and a non-flammable gas is filled while flowing into and out of the closed chamber. A metal arc discharge melting furnace is provided on the upper side of the closed chamber, and a lower end of the metal arc discharge melting furnace is provided on the lower side of the metal arc discharge melting furnace. A molten metal outlet is formed, and a substrate on which the molten metal flowing out of the metal arc discharge melting furnace is laminated is provided below the metal arc discharge melting furnace inside the closed chamber, and the metal arc discharge melting furnace and the substrate are relatively positioned. A molding apparatus without a mold, which is provided so as to be movable in a three-dimensional direction.