JP2013000778A - Method for manufacturing metal alloy molding, method for manufacturing metal alloy component, and metal alloy molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve formability and production efficiency of a metal alloy molding in a method for manufacturing the metal alloy molding.SOLUTION: The method for manufacturing the metal alloy molding includes: a metal alloy arrangement step (S1) for arranging a metal alloy on a hearth arranged to mutually separate a plurality of cavities; a dissolving step (S2) for dissolving the metal alloy by being arc-discharged on an arc irradiation region set on a region including an arrangement position of the metal alloy; a molten metal filling step (S3 and the like) for relatively moving the cavities to the arc irradiation region and filling the cavities with metal alloy molten metal by using a filling member contacted on the dissolved metal alloy molten metal; and a solidifying step (S4 and the like) for relatively moving filled cavities to the outside of the arc irradiation region and solidifying the metal alloy molten metal. The metal alloy molding is manufactured by sequentially repeating the molten metal filling step and the solidifying step for the pluralities of the cavities.

Description

  The present invention relates to a method for producing a metal alloy molded body, a method for producing a metal alloy component, and a metal alloy molding apparatus.

Conventionally, a method for producing a metal alloy molded body and a metal alloy molding apparatus are known in which a metal alloy is melted by an arc melting method and filled in a mold to form a metal alloy molded body.
As such a metal alloy forming apparatus, for example, Patent Document 1 describes an apparatus for manufacturing an amorphous alloy molded product. In this manufacturing apparatus, a metal material is disposed in a metal material melting portion provided on a lower mold having a cavity portion, and this metal alloy is melted by an arc melting method to form a molten metal. Then, the lower mold is moved to the position where the upper mold is arranged, and the upper mold is pressed to the lower mold side to perform clamping, thereby filling the cavity with the molten metal and filling the molten metal with the desired shape. To form.

JP 2001-71113 A

However, the conventional method for producing a metal alloy molded body and the metal alloy molding apparatus as described above have the following problems.
In the technique described in Patent Document 1, after forming a molten metal by an arc melting method, the lower mold is moved from a position where arc melting is performed to perform molding. For this reason, cooling of the molten metal proceeds during movement, and the fluidity of the molten metal deteriorates during mold clamping. As a result, there is a problem that moldability deteriorates. For example, there is a problem that a large mold clamping force is required, or a cavity shape transfer property is deteriorated because the filling property is deteriorated.

The present invention has been made in view of the above problems, and provides a method for producing a metal alloy molded body and a metal alloy molding apparatus capable of improving the moldability and production efficiency of the metal alloy molded body. With the goal.
It is another object of the present invention to provide a method for producing a metal alloy part that can efficiently produce a metal alloy part.

  In order to solve the above-mentioned problems, a method for producing a metal alloy molded body according to the present invention includes a metal alloy placement step of placing a metal alloy on a hearth in which a plurality of cavities are spaced apart from each other, and the metal alloy A melting step in which the metal alloy is melted by arc discharge to an arc irradiation region set to a region including the arrangement position of the metal, and a metal that is moved relative to the arc irradiation region and melted in the arc irradiation region A molten metal filling step of filling the cavity with the molten metal alloy using a filling member that abuts the molten alloy, and the cavity filled with the molten metal alloy is moved relative to the outside of the arc irradiation region, and A solidifying step for solidifying the molten metal alloy, and sequentially repeating the molten metal filling step and the solidifying step for each of the plurality of cavities. Succoth, the respective shapes of the plurality of cavities and a method of making a metal alloy formed body that has been transferred.

  Further, in the method for producing a metal alloy molded body of the present invention, the hearth has a molten metal flow path in which the plurality of cavities are integrally provided and the molten metal alloy can be circulated on each opening of the plurality of cavities. It is preferable that the filling member is a member that regulates movement of the molten metal alloy in the relative movement direction of the cavity in the molten metal flow path.

In the method for producing a metal alloy molded body of the present invention, the filling member is preferably made of a material having an electrical resistivity of 6 × 10 ⁻⁸ Ωm or less.

  In the method for producing a metal alloy molded body according to the present invention, the filling member is preferably made of a material having a thermal conductivity of 130 W / (m · K) or more.

  The method for producing a metal alloy part of the present invention is a method for producing a metal alloy part by processing the metal alloy molded body produced by the method for producing a metal alloy molded body of the present invention.

  The metal alloy forming apparatus of the present invention is a metal alloy forming apparatus for producing a metal alloy formed body by an arc melting method, wherein a plurality of cavities having the shape of the metal alloy formed body are arranged apart from each other. A discharge electrode for performing arc discharge to an arc irradiation area set to an area including the arrangement position of the metal alloy arranged on the hearth, and the arc irradiation area by moving the cavity relative to the arc irradiation area And a filling member that abuts against the molten metal alloy melted in the arc irradiation region and fills the cavity that is relatively moved into the arc irradiation region with the molten metal alloy. And

  In the metal alloy molding apparatus of the present invention, the hearth is provided with a plurality of cavities integrally and a melt flow path through which the metal alloy melt can be circulated on each opening of the plurality of cavities. The filling member is preferably a member that regulates the movement of the molten metal alloy in the relative movement direction of the cavity in the molten metal flow path.

In the metal alloy forming apparatus of the present invention, the filling member is preferably made of a material having an electric resistivity of 6 × 10 ⁻⁸ Ωm or less.

  In the metal alloy forming apparatus of the present invention, it is preferable that the filling member is made of a material having a thermal conductivity of 130 W / (m · K) or more.

According to the metal alloy molded body manufacturing method and metal alloy molding apparatus of the present invention, the metal alloy melt to be melted in the arc irradiation region is filled into the cavity in the arc irradiation region, and the molding is sequentially performed sequentially by the plurality of cavities. Therefore, there is an effect that the formability and manufacturing efficiency of the metal alloy molded body can be improved.
Further, according to the method for producing a metal alloy part of the present invention, since the method for producing a metal alloy molded body of the present invention is used, the metal alloy part can be efficiently produced.

It is the typical front view and AA sectional view showing the schematic structure of the metal alloy forming device concerning the embodiment of the present invention. It is the typical front view which shows the example of the metal alloy molded object produced with the metal alloy shaping | molding apparatus which concerns on embodiment of this invention, and its B view. It is a typical front view which shows an example of the filling member used for the metal alloy shaping | molding apparatus which concerns on embodiment of this invention. It is a flowchart which shows the process flow of the preparation method of the metal alloy molded object which concerns on embodiment of this invention, and the preparation method of metal alloy components. It is process explanatory drawing which shows the metal alloy arrangement | positioning process of the manufacturing method of the metal alloy molded object which concerns on embodiment of this invention, and process explanatory drawing which shows the melting process and molten metal filling process in a 1st cavity. It is process explanatory drawing which shows the molten metal filling process in the 2nd cavity of the manufacturing method of the metal alloy molded object which concerns on embodiment of this invention, and the solidification process in a 1st cavity. It is the typical top view which shows the example of the metal alloy component produced with the production method of the metal alloy component which concerns on embodiment of this invention, and its CC sectional drawing.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, a metal alloy forming apparatus according to an embodiment of the present invention will be described.
Fig.1 (a) is a typical front view which shows schematic structure of the metal alloy shaping | molding apparatus which concerns on embodiment of this invention. FIG.1 (b) is AA sectional drawing in Fig.1 (a). Fig.2 (a) is a typical front view which shows the example of the metal alloy molded object produced with the metal alloy shaping | molding apparatus which concerns on embodiment of this invention. FIG. 2B is a view as viewed from B in FIG. FIG. 3 is a schematic front view showing an example of a filling member used in the metal alloy forming apparatus according to the embodiment of the present invention.

A metal alloy forming apparatus 50 according to the present embodiment is an apparatus for producing a metal alloy formed body by an arc melting method, and forms a vacuum atmosphere or an inert gas atmosphere inside to form a metal alloy as shown in FIG. The chamber 1 is connected to the chamber 1 by the pipe line 8a, the vacuum atmosphere control unit 8 is configured to adjust the degree of vacuum inside by performing vacuum suction from the chamber 1, and is connected to the chamber 1 by the pipe line 7a and is inactive to the chamber 1 And an inert gas supply unit 7 for supplying the gas G. Examples of the inert gas G include argon (Ar) and nitrogen (N ₂ ).

  Inside the chamber 1, a hearth 2, an arc electrode part 4, and a filling member 5 are arranged.

Hearth 2 is a member constituting a metal mold for forming a metal alloy molded body. In this embodiment, the hearth 2 is made of a metal member whose outer shape is substantially disk-shaped and whose center axis O is aligned in the vertical direction.
On the upper surface of the hearth 2, a groove portion 2 b is formed in which the shape in plan view is an annular shape coaxial with the central axis O, and the vertical section including the central axis O is rectangular.
A plurality of cavities 2a are provided on the groove bottom surface 2c of the groove 2b so as to be spaced apart from each other in the circumferential direction at the center in the groove width direction.
The cavity 2a is a concave portion that extends from the groove bottom surface 2c toward the inner side in order to form the shape of the metal alloy formed body formed by the metal alloy forming apparatus 50, and may be formed in an appropriate shape according to the shape of the metal alloy formed body. it can.
In this embodiment, as an example, a cylindrical cavity 2a having a volume of about 1 cm ³ is provided. Adjacent cavities 2a are each spaced 6 mm apart in this embodiment. Therefore, in the present embodiment, as shown in FIG. 1B, the upper end of each cavity 2a forms a circular opening 2d in the groove bottom surface 2c.

  A rotation mechanism 3 (relative movement mechanism) that rotates the hearth 2 with a motor (not shown) is connected to the lower surface side of the hearth 2. The rotation center of the rotation mechanism 3 coincides with the center axis O of the hearth 2, and can be rotated clockwise when viewed from above as shown in FIG. .

As the material of the hearth 2, an appropriate metal material having excellent thermal conductivity can be adopted. In this embodiment, as an example, C1020 that is copper is employed.
In addition, the hearth 2 may be a single block member, but in the present embodiment, a plurality of block members are detachably assembled.
Although not shown, a cooling conduit for circulating a refrigerant supplied from the outside for forced cooling is provided inside the hearth 2.

Here, an example of the shape of the metal alloy molded body molded by the hearth 2 will be described.
As shown in FIGS. 2A and 2B, the metal alloy molded body 10 molded by the metal alloy molding apparatus 50 has a plurality of cylindrical part shape portions 10a to which the shape of the cavity 2a is transferred, and A flat plate-like runner portion 10b that connects the adjacent component shape portions 10a at one end is provided.
As will be described later, the runner portion 10b is a shape portion in which the molten metal alloy overflowing from the cavity 2a is solidified in the groove portion 2b. For this reason, the shape of the runner 10b in plan view is formed along the circular shape of the groove 2b in plan view in the present embodiment.
Moreover, the thickness of the runner part 10b is formed thinner than the groove depth of the groove part 2b, and is 1 mm as an example in this embodiment.

  The material of the metal alloy molded body 10 is not particularly limited as long as it is a metal alloy material that can be melted using an arc melting method. Examples of suitable materials for the metal alloy molded body 10 include metal alloys such as titanium (Ti) alloy, magnesium (Mg) alloy, iron (Fe) alloy, zirconium (Zr) alloy, and aluminum (Al) alloy. Can be mentioned.

  The arc electrode part 4 forms a molten metal alloy by performing arc discharge on the metal alloy arranged on the hearth 2, and as shown in FIGS. 1 (a) and 1 (b), the arc discharge is performed. An arc electrode 4a (discharge electrode) to be performed and an electrode support 4b that supports the arc electrode 4a in the chamber 1 are provided.

In this embodiment, the arc electrode 4a is a non-consumable arc electrode made of tungsten (W).
Further, the arc electrode 4a is arranged in a state where the electrode tip is directed to the center in the width direction of the groove 2b of the hearth 2, and is supported above the groove 2b by the electrode support 4b.
An arc power source 6 for supplying electric power necessary for arc discharge to the arc electrode 4a is provided outside the chamber 1, and the arc electrode 4a is electrically connected to the arc power source 6 by a wiring 6a.
As shown in FIG. 1 (a), the arc electrode 4a has an installation position in the height direction including at least the opening 2d when the cavity 2a moves directly below the arc electrode 4a, and the groove width of the groove 2b. It is set so that the arc irradiation area _RA is formed in a range covering. Thereby, the metal alloy in the arc irradiation region _RA is arc-melted and can be maintained in a molten state.

The filling member 5 is a member that is disposed on the groove 2b on the downstream side in the rotation direction of the hearth 2 with respect to the arc electrode 4a, and fills the cavity 2a with the molten metal alloy formed in the groove 2b.
As shown in FIG. 3, the filling member 5 of the present embodiment has a rectangular insertion portion 5b that can be inserted with a slight gap from the groove portion 2b on the lower surface side of the rectangular block-shaped main body portion 5d. In addition, a support portion 5e for fixing the position in the chamber 1 is provided on the side surface of the main body portion 5d. The support part 5e is fixed to the inner wall of the chamber 1 in this embodiment.

By the support portion 5e, the main body portion 5d and the insertion portion 5b are arranged at positions as shown in FIGS. 1 (a) and 1 (b). That is, the main body portion 5d and the insertion portion 5b are arranged at a position where a part of the horizontal direction regulating surface 5c which is a side surface facing the arc electrode 4a overlaps the arc irradiation region _RA . The position corresponding to the specific example of the dimension of the above hearth 2 is a position where the center of the arc electrode 4a and the horizontal regulating surface 5c are separated from each other by 20 mm along the circumferential direction.
Moreover, the insertion part 5b is inserted in the groove part 2b so that a groove | channel cross section may be plugged up. In the present embodiment, the gap between the vertical regulating surface 5a, which is the lower surface of the insertion portion 5b, and the groove bottom surface 2c is set to 1 mm, and sliding is possible between the insertion portion 5b and the groove inner surface of the groove portion 2b. Is fitted.
Further, the main body 5d protrudes vertically upward from the groove 2b.

In the present embodiment, the filling member 5 is disposed at a position that partially overlaps the arc irradiation region _RA, and therefore, a material that does not easily deteriorate due to the influence of arc discharge is employed.
For example, when a material having a low electrical resistivity is employed, heat generation due to Joule heat when arc discharge is induced can be suppressed, so that deterioration is difficult. In addition, when a material having a high thermal conductivity is adopted, the heat received from the arc discharge and the Joule heat generation are easily radiated, so that the material is not easily deteriorated.
For example, preferred materials include oxygen-free copper, copper alloy, aluminum (Al), Al alloy, Mg alloy, mild steel such as iron alloy, and stainless steel.
The value of electrical resistivity is preferably 6 × 10 ⁻⁸ Ωm or less, and more preferably 3 × 10 ⁻⁸ Ωm or less.
The value of thermal conductivity is preferably 130 W / (m · K) or more, more preferably 200 W / (m · K) or more.

A method for producing a metal alloy molded body and a method for producing a metal alloy part of the present embodiment will be described.
FIG. 4 is a flowchart showing a process flow of a method for producing a metal alloy molded body and a method for producing a metal alloy component according to an embodiment of the present invention. Fig.5 (a) is process explanatory drawing which shows the metal alloy arrangement | positioning process of the preparation methods of the metal alloy molded object which concerns on embodiment of this invention. FIG.5 (b) is process explanatory drawing which similarly shows the melt | dissolution process and molten metal filling process in a 1st cavity. 6A and 6B are process explanatory views showing a melting process and a molten metal filling process in the second cavity of the method for producing a metal alloy molded body according to the embodiment of the present invention. FIG. 7A is a schematic plan view showing an example of a metal alloy part produced by the method for producing a metal alloy part according to the embodiment of the present invention. FIG.7 (b) is CC sectional drawing in Fig.7 (a).

The method for producing a metal alloy molded body of the present embodiment is a method in which steps S1 to S (2N + 4) shown in FIG. Here, N is the number of component shape portions 10a in the metal alloy molded body 10, and is an integer of 2 or more. The upper limit value of N is the number of cavities 2 a provided in the hearth 2.
Moreover, the manufacturing method of the metal alloy component of this embodiment is a method of performing step S (2N + 4) after performing steps S1 to S (2N + 3).

First, a method for producing a metal alloy formed body of the present embodiment will be described based on a specific example (Example 1) together with the operation of the metal alloy forming apparatus 50.
In the following description, it is assumed that the material of the metal alloy is a 6-4Ti alloy (JIS 60 type) and the material of the filling member 5 is aluminum alloy A7075 (super duralumin). A7075 has an electrical resistivity of 5.4 × 10 ⁻⁸ Ωm and a thermal conductivity of 130 W / (m · K).

In step S1, a metal alloy arrangement process is performed.
This step is a step of disposing a metal alloy on the hearth 2 in which a plurality of cavities 2a are disposed apart from each other.
In the present embodiment, a massive metal alloy solid M ₀ that is weighed by a necessary amount to form the metal alloy compact 10 is prepared as the metal alloy. Then, as shown in FIG. 5 (a), in a state where the rotation of the hearth 2 is stopped, in one of the cavities 2a located directly below the arc electrode 4a (hereinafter referred to as the cavity 2A), placing the metallic alloy solid _{M 0.} Then, the door of the chamber 1 is closed.
Mass of metal alloy solid _{M 0} is a metal alloy solid _{M 0} is a 6-4Ti alloy case N = 4, it is sufficient 20g.
Next, after vacuuming the inside of the chamber 1 by the vacuum atmosphere control unit 8 to 1 × 10 ⁻³ Pa or less, Ar gas having a purity of G1 is supplied as the inert gas G from the inert gas supply unit 7. Inert gas replacement is performed until 50000 Pa.
Thus, step S1 is completed.

Next, in step S2, a dissolution process is performed.
This step is a step of dissolving the metal alloy solid M ₀ by arc discharge to the set arc exposure region R _A in the region including the position of the metal alloy solid M _0.
In the present embodiment, the arc irradiation region _RA is set below the arc electrode 4a in a range that includes the groove width of the groove 2b and reaches a part of the filling member 5. For this reason, the metal alloy solid M ₀ disposed in the cavity 2A immediately below the arc electrode 4a and the groove 2b on the cavity 2A is within the range of the arc irradiation region _RA .
In order to melt the metal alloy solid M ₀ , power supply from the arc power source 6 to the arc electrode 4a is started, and, for example, 200 A arc discharge is performed. Thus the arc discharge is irradiated to the metal alloy solid M _0, it begins to dissolve the metal alloy solid M _0. After about 60 seconds, as shown in FIG. 5B, all of the metal alloy solid M ₀ is melted to form a liquid metal alloy melt M ₁ having a high fluidity.
This is the end of step S2.
In the present embodiment, since the electrical resistivity of the material of the filling member 5 is 6 × 10 ⁻⁸ Ωm or less and the thermal conductivity is 130 W / (m · K) or more, the arc irradiation region _RA Even if it is part of this, it is less susceptible to thermal effects from arc discharge.

Next, in step S3, a molten metal filling process is performed on the cavity 2A which is the first cavity 2a.
In this step, the cavity 2A with relatively moves in an arc irradiation region R _A, a metal alloy melt M ₁ using the filling member 5 abutting the metal alloy melt M ₁ is dissolved in an arc illuminated area R _A in the cavity 2A It is a process of filling.
In the present embodiment, since the metal alloy solid M ₀ in step S1 is disposed on the cavity 2A, as shown in FIG. 5 (b), together with the metal molten alloy M ₁ is formed in step S2, its own weight some of the metal molten alloy M ₁ by begins to flow into the cavity 2A.
In this step, in order to reliably fill the metal molten alloy M ₁ into the cavity 2A, by driving the rotating mechanism 3, the cavity 2A rotates the hearth 52 in a direction suited to filling member 5 side.
Thus, a metal alloy melt M ₁ formed in the groove 2b on the cavity 2A is rotated together with hearth 52, but a metal alloy melt M ₁ is horizontally by horizontal regulating surface 5c of the filling member 5 position is fixed Directional movement is prevented. Therefore, to stay in the state in which the metal molten alloy M _1, which is prevented from moving is raised by surface tension in the vicinity of the horizontal regulating surface 5c.

Metal molten alloy M ₁ is while in arc exposure region R _A is always subjected to arcing, it is heated and maintained in a liquid state, depending on the temperature drop when flowing outwardly from the arc illuminated area R _A Although the viscosity changes, the liquid state with good fluidity is maintained up to a certain temperature.
Therefore, metal alloy melt M ₁ on the groove 2b is a to pass through a lower end of the horizontal regulating surface 5c, flows into the cavity 2A, satisfies the cavity 2A, when further passing through the vertical regulating face 5a The height is regulated by the vertical regulating surface 5a, and the flow path is narrowed so that it is pushed downward by the vertical regulating surface 5a. As a result, in a state in which the metal molten alloy M ₁ is reliably filled into the cavity 2A, the cavity 2A passes under the filling member 5.
This is the end of step S3.

Thus, the groove 2b formed on each opening portion 2d of the plurality of cavities 2a is a metal alloy melt M ₁ constitute a launder can flow.
The rotation mechanism 3 is moved relative to the cavity 2a against arc irradiation region R _A, constitute a relative movement mechanism for passing an arc illuminated area R _A.
The filling member 5, in the groove 2b, and become a member for restricting the movement of the metal molten alloy M ₁ in the direction of relative movement of the cavity 2a.

Next, in step S4, a solidification process is performed on the cavity 2A.
In this step, the cavity 2A metal molten alloy M ₁ is filled, move relatively to the outer side of the arc irradiation region R _A, is a step of solidifying the metal alloy melt M _1.
When the cavity 2A passes below the filling member 5 and finishes moving to the downstream side, the cavity 2A is positioned outside the arc irradiation area _RA as shown in FIG. Therefore, metal alloy melt M ₁ in the cavity 2A is no longer subjected to heating by the arc discharge, cooling deprived of heat is initiated by thermal conduction to the hearth 52.
As shown in FIG. 6 (b), when the cavity 2A reaches the outside of the filling member 5, the cooling proceeds and the heat dissipation from the top of the metal molten alloy M _1. When cooled to a temperature lower than the melting point of the metal alloy melt M _1, a metal alloy solidified portion M ₂ is gradually formed.
Metal alloy coated portion M _2, in the cavity 2A, solidified in a state where the shape of the inner peripheral surface of the cavity 2A is transferred, in the groove 2b, in close contact with the inner surface and the groove bottom surface 2c of the groove 2b, vertical It solidifies into a plate shape whose height is regulated by the regulating surface 5a.
Above, step S4 is complete | finished.

  Subsequently, in steps S5 to S (2N + 2), a melt filling process and a solidification process similar to those in steps S3 and S4 are sequentially performed on the second to Nth cavities 2a located on the upstream side in the rotation direction from the cavity 2A. Do. Here, the upstream side in the rotation direction means the side approaching the filling member 5 as the hearth 2 rotates.

For example, as shown in FIG. 6A, the cavity 2B adjacent to the cavity 2A reaches the arc irradiation region _RA in parallel with the solidification process performed on the cavity 2A.
Thereby, step S5 is started. That is, the metal molten alloy M ₁ which accumulated upstream of the horizontal movement by the regulating surface 5c is regulated horizontal regulating surface 5c is gradually filled into the cavity 2B with the movement of the cavity 2B, the entire cavity 2B metal molten alloy M ₁ is filled. Thereby, step S5 which is a molten metal filling process with respect to the cavity 2B is complete | finished.
Furthermore, as shown in FIG. 6 (b), the cavity 2B passes through the filling member 5 and moves outside of the arc illuminated area R _A, solidification step of a metal alloy melt M ₁ for cavities 2B is started. That is, the cavity 2B passing through the filling member 5, step S6 is the same solidification step as the step S3 is started, when the metal alloy coated portion M ₂ is formed by a metal alloy melt M ₁ in the cavity 2B, step S6 ends.
Similarly, for example, if N = 4, the cavity 2C adjacent to the upstream side of the cavity 2B (see FIGS. 6A and 6B) and the cavity 2D adjacent to the upstream side of the cavity 2C are respectively provided. Steps S7 to S10 are performed.
Thus, a metal alloy molded body 10 as shown in FIGS. 2A and 2B is formed on the hearth 2.
Here, the component shape part 10a is formed in the cavity 2a, and the runner part 10b is formed in the groove part 2b. The thickness of the runner portion 10b is determined by the size of the gap between the groove bottom surface 2c and the vertical regulating surface 5a.

Next, in step S (2N + 3), a mold release process is performed.
This step is a step of releasing the metal alloy molded body 10 on the hearth 2 from the hearth 2.
When the Nth cavity 2 a passes through the filling member 5, the power supply from the arc power source 6 is stopped to end the arc discharge, the driving of the rotating mechanism 3 is stopped, and the rotation of the hearth 2 is stopped.
Then, the chamber 1 is opened to the atmosphere, and the metal alloy molded body 10 is released from the hearth 2.
Above, step S (2N + 3) is complete | finished and the preparation methods of the metal alloy molded object of this embodiment are complete | finished.

According to a manufacturing method of a metal alloy formed body of the present embodiment, sequentially and continuously by a plurality of cavities 2a of the metal alloy melt M ₁ is dissolved in an arc illuminated area R _A is filled into the cavity 2a in the arc irradiation region R _A Can be molded. Therefore, metal alloy melt M ₁ is to be filled rapidly into the cavity 2a in the liquid state having high fluidity, it is possible to suppress the temperature drop and deterioration of the fluidity of the metal alloy melt M1. As a result, mold transferability is improved, and voids and defects are less likely to occur inside.
Further, by passing through the filling member 5, the molten metal alloy M ₁ is pushed in by the filling member 5 and the filling is completed. When the filling member 5 moves to the outside of the arc irradiation region _RA , the cooling is immediately started and solidification proceeds. . Thus, in this embodiment, since it can transfer to a solidification process continuously, without moving a hearth to the position clamped with an upper mold | die, it can shape | mold efficiently.

In addition, since a material having a low electrical resistivity and a high thermal conductivity is used as the filling member 5, it is difficult for the temperature of the filling member 5 to increase due to the influence of arc discharge, and the durability of the filling member 5 can be improved. it can.
In the above specific example, when the metal alloy molding apparatus 50 was inspected after the production of the metal alloy molded body 10 was completed, the filling member 5 was not melted and no deterioration such as coloring or deformation was observed. The same was true for Hearth 2.
Thus, in this embodiment, since hardly causes melting or deformation of the packing member 5, together with the force pushing the metal molten alloy M ₁ is stabilized, it is possible to maintain the thickness of the runner portion 10b constant, a metal alloy The moldability and shape accuracy of the molded body 10 can be stabilized.
Further, it is possible to prevent impurities from being mixed into the metal alloy molded body 10 due to deterioration or melting of the filling member 5.

Here, the durability in the specific example (Examples 1-10) of the material of the various filling members 5 in the said embodiment is demonstrated.
Table 1 below shows the materials used for the filling member 5 and the durability evaluation results.

Example 1 is an example using A7075 described above.
Example 2 is an example using A1050 (electric resistivity: 2.7 × 10 ⁻⁸ Ωm, thermal conductivity: 237 W / (m · K)), which is pure aluminum.
In Examples 3 to 6, A2017 (electrical resistivity: 5.0 × 10 ⁻⁸ Ωm, thermal conductivity: 190 W / (m · K)) and A3003 (electrical resistivity: 3.4 ×) which are Al alloys, respectively. 10 ⁻⁸ Ωm, thermal conductivity: 190 W / (m · K)), A4032 (electrical resistivity: 4.3 × 10 ⁻⁸ Ωm, thermal conductivity: 150 W / (m · K)), A5052 (electrical resistance) This is an example using a rate: 4.9 × 10 ⁻⁸ Ωm, thermal conductivity: 140 W / (m · K)).
Example 7 is an example using C1020 (electric resistivity: 1.7 × 10 ⁻⁸ Ωm, thermal conductivity: 401 W / (m · K)) which is oxygen-free copper.
Example 8 is an example using Mg alloy AZ31 (electrical resistivity: 74.0 × 10 ⁻⁸ Ωm, thermal conductivity: 96 W / (m · K)).
Example 9 is an example using S45C (electric resistivity: 22.0 × 10 ⁻⁸ Ωm, thermal conductivity: 40 W / (m · K)) of mild steel which is an iron alloy.
Example 10 is an example using stainless steel SUS303 (electric resistivity: 72.0 × 10 ⁻⁸ Ωm, thermal conductivity: 16.7 W / (m · K)), which is an iron alloy.

Using the filling member 5 made of these materials, the other conditions were the same as the specific example in the above embodiment, and after making a similar metal alloy molded body 10, the formability was confirmed, and the filling member 5 was Observation was made to inspect for dissolution, coloring, and deformation.
In Examples 1 to 7, no problem was found in the formability of the metal alloy molded body 10, and the mold transferability was good. In addition, the filling member 5 did not dissolve and was neither colored nor deformed. Therefore, it was evaluated as ◎.
On the other hand, in Examples 8 to 10, no problem was found in the moldability of the metal alloy molded body 10, and the mold transferability was good. Although the filling member 5 lysis has not occurred, the contact portion of the metal alloy melt M _1, it was observed slightly colored and deformation. However, the deformation was not so great as to affect the shape accuracy of the metal alloy molded body 10. For this reason, it evaluated as (circle) in the meaning of being relatively inferior compared with Examples 1-7.

Next, the manufacturing method of the metal alloy component of this embodiment is demonstrated.
In this method, after performing steps S1 to S (2N + 3) as described above, as step S (2N + 4), a metal alloy formed body 10 is processed to be processed into a metal alloy component, thereby performing a metal alloy. This is a method for producing a component.

As an example of a metal alloy part, the part which has the shape of each part shape part 10a in the metal alloy molded object 10 can be mentioned. In this case, examples of the processing applied to the metal alloy molded body 10 include a processing of cutting the runner portion 10b and separating the component shape portion 10a.
In the present embodiment, a cylindrical metal alloy part to which the shape of the cavity 2a is transferred can be produced. Such a metal alloy part can be used as, for example, a machine part such as a cylindrical pin, or an ingot whose mass is measured.

As another example of the metal alloy part, in the same manner as described above, after the individual part shape portion 10a is separated from the metal alloy molded body 10, additional processing is performed to change the shape and surface accuracy. be able to.
Examples of the additional processing include machining, for example, cutting and grinding. Further, when an ingot is formed from the metal alloy molded body 10, forging or casting may be performed using the ingot.
For example, in the case of this embodiment, the metal alloy component 11 shown to FIG. 7 (a), (b) can be mentioned, for example.

  The metal alloy part 11 has a cylindrical outer shape, a tubular member in which a through hole portion 11d is formed at the center of the axial end surfaces 11b and 11c, and an internal thread portion 11e is formed on the inner peripheral surface on the end surface 11c side. It is. The outer peripheral surface 11a of the metal alloy component 11 may be the outer peripheral surface of the component shape portion 10a as it is, or the outer peripheral surface of the component shape portion 10a may be cut to change the surface accuracy and the outer diameter.

In the processing step for producing the metal alloy part 11, after performing the cutting process for separating the part shape portion 10a from the metal alloy molded body 10 and the removing process, the outer peripheral surface is cut or ground as necessary. After that, the through hole 11d and the female thread 11e are formed by a lathe or the like.
In this way, the metal alloy part 11 is produced.

According to the method for producing a metal alloy component of the present embodiment, the metal alloy molded body 10 that is efficiently produced is additionally processed as an original shape, so that the production efficiency can be improved as a whole. Further, by forming the shape of the metal alloy molded body 10 into the shape of the metal alloy part 11, the amount of processing can be reduced.
Further, when a part of the molding surface of the metal alloy molded body 10 is used as the surface of the metal alloy component 11, the amount of processing can be further reduced.

In the above description of the embodiment, an example in which the hearth 2 is rotated by the rotation mechanism 3 and the cavity 2a of the hearth 2 passes through the arc irradiation region _RA has been described. However, the hearth 2 moves linearly. Thus, the arc irradiation region _RA may be passed.
Further, the hearth 2 may be fixed, and the cavity 2a may move relative to the arc irradiation area _RA by moving the arc electrode portion 4.

In the description of the above-described embodiment, the filling member 5 is disposed with a gap with respect to the groove 2b, so that the runner portion 10b is formed in the metal alloy molded body 10 as an example. filling member 5 is configured to be filled in the cavity 2a adjacent scraped metal alloy melt M ₁ between the cavity 2a, a metal alloy formed body 10 only at the part shape portion 10a may be constituted. In this case, one metal alloy molded body 10 is formed for each of the plurality of cavities 2a.
The filling member 5, until the metal molten alloy M ₁ is solidified to some extent, to close the opening 2d of the cavity 2a, may be configured to press the metal alloy melt M ₁ in the cavity 2a.

In the description of the above embodiment, the filling member 5 is described as an example of a plate-like member arranged in the vertical direction in the groove 2b. However, the filling member 5 is limited to a plate-like shape. Instead, an appropriate block shape may be used.
Further, the posture of the filling member 5 is not limited to the vertical position with respect to the relative movement direction of the metal alloy melt M _1, for example, arranged in a posture inclined in the direction in which the metal molten alloy M ₁ is coming towards May be. In this case, not only push the molten metal in a horizontal direction, because the component force is generated to push downward, a metal alloy melt M ₁ can be pushed into the cavity 2a more efficiently.

In the description of the above embodiment, an example in which a part of the filling member 5 is disposed at a position overlapping the arc irradiation area _RA has been described. However, the filling member 5 flows out of the arc irradiation area _RA and enters the insertion portion 5b. The filling member 5 may be disposed outside the arc irradiation region _RA as long as the molten metal alloy that comes into contact with the metal alloy has a distance that can maintain a molten state. In this case, since arc discharge is not induced, the durability of the filling member 5 can be further improved.

In the description of the above embodiments, the metal alloy disposing step have been described in the example in the case where a metal alloy melt M ₁ on the cavity 2a, it may be disposed on the groove bottom surface 2c between the cavity 2a .

  Further, all the components described in the above embodiments can be implemented by being appropriately combined or deleted within the scope of the technical idea of the present invention.

1 Chamber 2 Hearth 2a, 2A, 2B, 2C Cavity 2b Groove (molten flow path)
2d Opening 3 Rotation mechanism (relative movement mechanism)
4 Arc electrode part 4a Arc electrode (discharge electrode)
DESCRIPTION OF SYMBOLS 5 Filling member 5a Vertical direction regulation surface 5b Insertion part 5c Horizontal direction regulation surface 5d Main part 10 Metal alloy molded object 10a Part shape part 10b Runner part 11 Metal alloy part 50 Metal alloy shaping | molding apparatus G Inert gas M ₀ Metal alloy solid ( Metal alloy)
M ₁ metal alloy melt M ₂ metal alloy solidification part _RA arc irradiation area

Claims (9)

A metal alloy placement step of placing a metal alloy on the hearth in which a plurality of cavities are spaced apart from each other;
A melting step in which the metal alloy is melted by arc discharge in an arc irradiation region set in a region including an arrangement position of the metal alloy;
A molten metal filling step of filling the cavity with the molten metal alloy using a filling member that moves relative to the arc irradiated area and contacts the molten metal alloy melted in the arc irradiated area;
A solidification step of solidifying the metal alloy melt by moving the cavity filled with the metal alloy melt relative to the outside of the arc irradiation region;
With
Metal alloy molding characterized in that, by sequentially repeating the molten metal filling step and the solidification step for each of the plurality of cavities, a metal alloy molded body in which each shape of the plurality of cavities is transferred is produced. How to make a body. The Hearth is
The plurality of cavities are provided integrally, and on each opening of the plurality of cavities, a molten metal flow path through which the metal alloy molten metal can flow is provided,
The filling member is
The method for producing a metal alloy molded body according to claim 1, wherein the metal alloy molded body is a member that restricts movement of the molten metal alloy in a direction of relative movement of the cavity in the molten metal flow path. The filling member is
3. The method for producing a metal alloy molded body according to claim 1, wherein the metal alloy compact is made of a material having an electric resistivity of 6 × 10 ⁻⁸ Ωm or less. The filling member is
The method for producing a metal alloy molded body according to any one of claims 1 to 3, wherein the metal alloy is formed of a material having a thermal conductivity of 130 W / (m · K) or more. A method for producing a metal alloy part, comprising: producing a metal alloy part by processing the metal alloy compact produced by the method for producing a metal alloy compact according to any one of claims 1 to 3. A metal alloy molding apparatus for producing a metal alloy molded body by an arc melting method,
A hearth in which a plurality of cavities having the shape of the metal alloy molded body are arranged apart from each other;
A discharge electrode for performing arc discharge in an arc irradiation region set in a region including an arrangement position of the metal alloy arranged on the hearth;
A relative movement mechanism for moving the cavity relative to the arc irradiation region and passing the arc irradiation region;
A filling member that contacts the molten metal alloy melted in the arc irradiation region and fills the cavity with the metal alloy molten relative to the arc irradiation region;
A metal alloy forming apparatus comprising: The Hearth is
The plurality of cavities are provided integrally, and on each opening of the plurality of cavities, a molten metal flow path through which the metal alloy molten metal can flow is provided,
The filling member is
The metal alloy forming apparatus according to claim 6, wherein the metal alloy forming device is a member that regulates movement of the molten metal alloy in a direction of relative movement of the cavity in the molten metal flow path. The filling member is
The metal alloy forming apparatus according to claim 6 or 7, wherein the metal alloy forming apparatus is made of a material having an electric resistivity of 6 x ^10-8 Ωm or less. The filling member is
The metal alloy forming apparatus according to any one of claims 6 to 8, wherein the metal alloy forming apparatus is made of a material having a thermal conductivity of 130 W / (m · K) or more.

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