Method for separating metal materials

Abstract

To provide a method for separating metal materials by suppressing generation of a waste material by a simple configuration.SOLUTION: The method for separating metal materials includes: pulling a metal material 10 from a first direction; and heating a heated area 21 of the metal material 10 by sequentially heating the metal material 10 from a position near a first end 11 of the metal material 10 to a position near a second end 12 located on the opposite side of the first end 11 in a second direction that crosses the first direction while the metal material 10 is being pulled in the first direction, thereby forming a heated melting section 20 along the second direction. The heated melting section 20 is formed while the metal material 10 is being pulled in the first direction, thereby cracks C generated from the heated area 21 extend, causing the metal material 10 to separate.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method for separating metallic materials. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2002-346746 (Patent Document 1) is a prior art document that discloses a method for dismantling metal materials. In the method for dismantling metal materials described in Patent Document 1, welding material that is prone to weld cracks is used to weld the surface of the metal material to be dismantled at the dismantling position. This causes cracks due to weld cracks to occur in a direction parallel to the weld line. Force is applied to the tip of the crack to break the metal material and dismantle it.

[0003] A prior art document disclosing a cleaving method is JP-A-7-323382 (Patent Document 2). The cleaving method described in Patent Document 2 cleaves a material by guiding a crack formed at the processing start point of the material in a predetermined direction by the thermal stress of laser beam irradiation. A cooling means is arranged on the back side of the material to be processed so that the entire material is cooled, and then a laser beam is irradiated onto the surface of the material to induce a crack.

[0004] A prior art document disclosing a method for manufacturing a recycled welded joint and a method for dismantling it is JP 2005-305542 A (Patent Document 3). In the method for manufacturing a recycled welded joint and a method for dismantling it described in Patent Document 3, a dissimilar metal welded joint having an intermetallic compound layer capable of converting between ductility and brittleness is provided between metal welded joints. The joining surface of this joint is heated to generate a brittle intermetallic compound layer, and the joint is dismantled. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-346746 A [Patent Document 2] Japanese Patent Application Publication No. 7-323382 [Patent Document 3] JP 2005-305542 A Summary of the Invention [Problem to be solved by the invention]

[0006] In consideration of recyclability, the method for separating metal materials is required to suppress the generation of waste materials such as cuttings (such as dross, which is a powdered metal oxide) when separating the metal materials. However, in the methods for separating metal materials described in Patent Document 1 and Patent Document 3, brittle materials that are easy to separate are selected, which increases the material cost and limits the types of materials. In addition, in the method for separating metal materials described in Patent Document 2, auxiliary materials such as a refrigerant for cooling the metal materials are required, and the thickness of the metal materials is limited in order to cool the metal materials. As such, it is difficult to separate metal materials while suppressing the generation of waste materials using a simple configuration.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a method for separating metal materials that has a simple configuration and can separate metal materials while suppressing the generation of waste. [Means for solving the problem]

[0008] A method for separating a metallic material according to the present invention includes pulling the metallic material from a first direction, and, while the metallic material is being pulled in the first direction, sequentially heating the metallic material in a second direction intersecting the first direction from a position close to a first end of the metallic material to a position close to a second end opposite the first end, thereby heating a heated region of the metallic material so as to form a heat-melted portion along the second direction. As the heat-melted portion is formed in a state in which the metallic material is pulled in the first direction, a crack generated in the heated region propagates and the metallic material is separated.

[0009] In this case, solidification cracking occurs when the metallic material solidifies in the heated region, and the crack propagates to separate the metallic material. As a result, the metallic material can be separated with a simple configuration and with less waste than when using auxiliary materials such as welding materials, refrigerant gas, or insert materials.

[0010] In one embodiment of the invention, the heat melted portion when formed has a teardrop shape that tapers toward the rear in a direction from a position toward the first end toward a position toward the second end.

[0011] In this case, the tapered portion of the teardrop shape is aligned along the second direction, and the coexisting interface between the solid phase and the liquid phase can be preferentially arranged in the tapered portion of the teardrop shape. This allows the coexisting interface to be arranged so as to intersect with the first direction in which the metallic material is pulled, making it easier to cause solidification cracking. As a result, it is easier to cause cracks due to solidification cracking in the heated region of the metallic material, so that cracks can be caused in the metallic material by a smaller tensile stress than in the method of separating the metallic material when the heated and molten portion is elliptical.

[0012] In one form of the invention, the metal material is stretched prior to heating the metal material.

[0013] In this case, cracks can be reliably generated in the heated area.

[0014] In one embodiment of the present invention, in heating the heated region of the metallic material, a heat-melted portion is not formed at the first end portion and the second end portion of the metallic material.

[0015] This makes it possible to prevent the molten metal material from melting down due to the impact when the metal material is separated.

[0016] In one embodiment of the present invention, a heat-melted portion is formed over the entire thickness direction of the metal material intersecting the first direction and the second direction by heating a heated region of the metal material.

[0017] In this case, the area of ​​the interface between the solid and liquid phases where cracks occur in the metal material can be secured over a wide range in the thickness direction, and as a result, cracks can be generated in the heated area of ​​the metal material with a small tensile stress. Effect of the Invention

[0018] According to the present invention, it is possible to separate metal materials while suppressing the generation of waste with a simple configuration. [Brief description of the drawings]

[0019] [Figure 1] 1 is a perspective view showing a configuration of a metal material separation device according to an embodiment of the present invention. [Diagram 2] 1 is a flowchart showing a method for separating a metal material according to an embodiment of the present invention. [Diagram 3] 1 is a plan view showing a state in which a metal material according to an embodiment of the present invention is heated while being pulled; [Figure 4] 4 is a cross-sectional view of the metal material of FIG. 3 as viewed from the direction of the arrows IV-IV. [Diagram 5] FIG. 2 is a perspective view showing a state immediately before heating of the metal material is completed. [Figure 6] FIG. 2 is a schematic diagram showing typical solidification cracking. [Figure 7] 1 is a plan view showing an arrangement of crystal grain boundaries formed when a metal material according to an embodiment of the present invention is heated and solidified. FIG. [Figure 8] 10 is a plan view showing the arrangement of crystal grain boundaries formed when a metal material according to a modified example is heated and solidified. FIG. [Figure 9] 13 is a plan view showing a state in which a metal material according to a modified example is heated while being pulled. FIG. [Figure 10] FIG. 1 is a plan view showing an embodiment of the present invention. [Figure 11] 1 is a graph comparing the amount of waste generated for each method of separating metal materials. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, a method for separating metal materials according to one embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiment, the same or corresponding parts in the drawings are given the same reference characters and their description will not be repeated.

[0021] In the drawings, the direction in which the metal material is pulled is the first direction, or X direction, the direction in which the metal material is heated is the second direction, or Y direction, and the thickness direction of the metal material in the heated area of ​​the metal material is the Z direction.

[0022] First, the configuration of a metallic material separating apparatus according to an embodiment of the present invention will be described. Fig. 1 is a perspective view showing the configuration of a metallic material separating apparatus according to an embodiment of the present invention. As shown in Fig. 1, a separating apparatus 1 according to an embodiment of the present invention includes a tension unit 2 and a heating unit 3.

[0023] The metal material 10 separated by the separation device 1 has a rectangular tubular shape with the axial direction in the Y direction. Note that the metal material 10 is not limited to a rectangular tubular shape, and may be in the form of a plate.

[0024] The metallic material 10 according to the present embodiment is mainly used as a structural material. The metallic material 10 is, for example, a steel material. Note that the metallic material 10 is not limited to a steel material, and may be a metallic material such as stainless steel, copper, or aluminum, or an alloy containing these as a main component.

[0025] The metal material 10 has a first end 11 and a second end 12. The first end 11 is one end in the Y direction. The second end 12 is the other end in the Y direction. The metal material 10 is divided into a first portion 15 and a second portion 16 on both sides in the X direction of a heated region 21 described below.

[0026] The tension unit 2 is provided to tension the metal material 10. The tension unit 2 in this embodiment is disposed inside the rectangular cylindrical shape of the metal material 10.

[0027] The pulling unit 2 includes a jack 4 and a pressing mechanism 5. The jack 4 is, for example, an electric jack. The pressing mechanism 5 presses the metal material as the jack 4 is driven. In this embodiment, as the jack 4 is driven in the X direction, the pressing mechanism 5 drives from the inside to the outside of the metal material 10 (direction DR1 in FIG. 1). This causes the metal material 10 to be pressed from the inside to the outside. Stress acts on the metal material 10 in the heated region 21 so as to pull it from both sides in the X direction.

[0028] The pulling unit 2 is configured to pull the metal material 10 from both sides, but is not limited to this. When the metal material is a plate-like member, the pulling unit 2 may be configured to pull from one side, such as by fixing one end of the plate-like member and pulling only from the other end. In addition, the driving of the pulling unit 2 is not limited to driving by an electric jack, and may be driven by a hydraulic jack or a compressor, etc.

[0029] The heating unit 3 heats the metal material 10. The heating unit 3 is provided so as to be movable along a planned separation line SL that separates the metal material 10 into a first portion 15 and a second portion 16.

[0030] The heating unit 3 includes an electrode 6. The electrode 6 and the metal material 10 are electrically connected to a current-carrying device (not shown). An arc A is generated from the electrode 6 by passing a current from the current-carrying device. When the arc A hits the outer surface of the metal material 10, a part of the metal material 10 is overheated and melted. A heated and melted portion 20, which will be described later, is formed in the metal material 10.

[0031] The heating unit 3 according to one embodiment of the present invention heats the metal material 10 by a plasma arc. However, the configuration of the heating unit 3 is not limited to a configuration in which the metal material 10 is heated by a plasma arc. The heating unit 3 may be configured to heat the metal material 10 by high-frequency induction heating, laser irradiation, gas welding, or the like. When the heating unit is configured by gas welding, it is preferable to use an oxyacetylene flame during welding.

[0032] Next, a method for separating a metallic material according to an embodiment of the present invention will be described. Fig. 2 is a flow chart showing a method for separating a metallic material according to an embodiment of the present invention. Fig. 3 is a plan view showing a state in which a metallic material according to an embodiment of the present invention is heated while being pulled. Fig. 4 is a cross-sectional view of the metallic material in Fig. 3 as seen from the direction of the arrows IV-IV.

[0033] 2 to 4, in a method for separating a metallic material according to an embodiment of the present invention, first, a metallic material 10 is pulled from a first direction (X direction) (S1 step). In this embodiment, the metallic material 10 is pulled from both sides in the X direction (from the DR2 direction in FIG. 3) by a pulling unit.

[0034] Next, while the metallic material 10 is being pulled in the first direction (X direction), the heated region 21 of the metallic material 10 is heated along a second direction (Y direction) intersecting the first direction (X direction) (step S2). Specifically, while the metallic material 10 is being pulled in the first direction (X direction), the metallic material 10 is heated in the second direction (Y direction) from a position close to the first end 11 of the metallic material 10 to a position close to the second end 12 located on the opposite side to the first end 11 (DR3 direction in FIG. 3). As a result, the heated region 21 of the metallic material 10 is heated so that a heat-melted portion 20 is formed along the second direction (Y direction).

[0035] In this embodiment, the metal material 10 is stretched before the metal material 10 is heated. Note that the metal material 10 may be stretched simultaneously with the heating of the metal material 10, which will be described later.

[0036] As the heating unit moves, the heat-melted portion 20 moves and the heated region 21 solidifies. When the heated region 21 solidifies, a heat mark 24 having a wavy uneven shape (ripples) is formed on the material surface. In the heated region 21, grain boundaries 30 are formed as the material solidifies.

[0037] In this embodiment, the direction in which the metal material 10 is pulled (X direction) and the direction in which the heated region 21 is formed (Y direction) are perpendicular to each other, but this is not limited to this, and the direction in which the metal material 10 is pulled and the direction in which the heated region 21 is formed may intersect and be inclined with respect to each other.

[0038] 4, by heating the heated region 21 of the metal material 10, a heat-melted portion 20 is formed in the entire thickness direction (Z direction) of the metal material 10 that intersects with the first direction (X direction) and the second direction (Y direction). The thickness of the metal material 10 in this embodiment is, for example, 6 mm.

[0039] The heat-melted portion 20 does not have to be formed over the entire thickness direction (Z direction) of the metal material 10. The heat-melted portion 20 may be formed over 50% or more and less than 100% of the thickness of the metal material 10 in the thickness direction of the metal material 10, for example.

[0040] In this embodiment, the heat-melted portion 20 when formed has an arc shape on the front side 22. Also, the heat-melted portion 20 when formed has a teardrop shape with a tapered rear side 23 in the direction from a position closer to the first end 11 toward a position closer to the second end 12.

[0041] The teardrop shape of the heat melted portion 20 is produced by a medium or high heating rate, for example, 40 cm / min or higher.

[0042] Table 1 shows the separation conditions for separating the metal material 10 while forming the heat-melted portion 20 having a teardrop shape. As shown in Table 1, the separation of the metal material varies depending on the thickness of the material, the heating rate, the heating current, the arc voltage, and the tensile load. When the separation device 1 is driven under at least separation conditions 1 to 3 shown in Table 1, the metal material 10 can be separated while the heat-melted portion 20 has a teardrop shape.

[0043] [Table 1]

[0044] Fig. 5 is a perspective view showing a state immediately before the heating of the metal material is completed. As shown in Fig. 5, the metal material 10 is heated so that the heat-melted portion 20 is formed up to a position close to the second end 12 while the crack C extends along the second direction (Y direction).

[0045] In heating the heated region 21 of the metallic material 10, the heat-melted portion 20 is not formed at the first end 11 and the second end 12 of the metallic material 10. This makes it possible to prevent the heat-melted portion 20 of the metallic material 10 from melting off the outer surface of the metallic material 10 due to the impact when the metallic material 10 is separated.

[0046] Since the heat melting portion 20 is not formed at the first end 11 and the second end 12 of the metal material 10, the heated region 21 extends in the second direction (Y direction) so as not to reach the first end 11 and the second end 12. In the X direction, the heated region 21 is formed at a distance L1 from the first end 11. Also, in the X direction, the heated region 21 is formed at a distance L2 from the second end 12. The distances L1 and L2 are, for example, 1 mm or more and 5 mm or less.

[0047] The heat melted portion 20 is formed in a state where the metal material 10 is pulled in the first direction (X direction). As a result, a crack C generated from the heated region 21 propagates and the metal material 10 is separated. The crack C propagates along the planned separation line SL. The metal material 10 is separated into a first portion 15 and a second portion 16.

[0048] Next, the mechanism of the method for separating metallic materials in this embodiment will be described. The method for separating metallic materials in this embodiment utilizes solidification cracking that occurs when a metallic material is heated and part of it solidifies. Solidification cracking is a type of high-temperature cracking.

[0049] Fig. 6 is a schematic diagram showing typical solidification cracking. As shown in Fig. 6, solidification cracking occurs when a tensile strain caused by the solidification shrinkage of a metallic material acts on a part where a liquid film (molten metal that has not yet solidified) remains during the solidification of the metallic material.

[0050] Specifically, the mechanism by which solidification cracking occurs is as follows: when a molten metal material solidifies, crystal grains 7 are formed. Low-melting point compounds 8, such as sulfur or phosphorus, segregate in a liquid state to crystal grain boundaries 9. When stress is applied to the low-melting point compounds 8 due to thermal strain (stress is applied in the direction of the arrow in Figure 6), the bonds between the crystal grains 7 are lost, and cracks occur in the liquid parts. In this way, when tensile stress is applied in a direction perpendicular to the crystal grain boundaries 9, solidification cracking occurs at the coexisting interface between the solid and liquid phases between the crystal grain boundaries 9.

[0051] Fig. 7 is a plan view showing the arrangement of crystal grain boundaries formed when a metallic material according to an embodiment of the present invention is heated and solidified, in which no tensile stress is applied to the metallic material 10 in the X direction.

[0052] 7, grain boundaries 30 are formed in the metal material 10 as it solidifies after heating. In the present embodiment, a first grain boundary 31 and a second grain boundary 32 are formed.

[0053] The first crystal grain boundary 31 is formed along the second direction (Y direction). The second crystal grain boundary 32 is formed from the center in the X direction of the heated region 21 toward both sides while inclining toward the second end portion 12 side. Since the heat-melted portion 20 is teardrop-shaped, the rear side 23 of the heat-melted portion 20 solidifies approximately at the center of the heated region 21 in the X direction, and the first crystal grain boundary 31 is formed.

[0054] As described above, solidification cracking occurs when a tensile stress is applied to the coexistence interface between the solid phase and the liquid phase at the grain boundary in a direction perpendicular to the coexistence interface between the solid phase and the liquid phase. In this embodiment, like the grain growth mode in medium or high speed heating, the grains grow toward the center of the heated region 21 in the X direction. A single large first grain boundary 31 is formed along the Y direction. In this case, stress concentration occurs at the first grain boundary 31, so that a tensile stress is applied in the X direction to the coexistence interface between the solid phase and the liquid phase along the first grain boundary 31, making it easier for solidification cracking to occur. As a result, a crack C occurs at the position where the first grain boundary 31 occurs, as shown in FIG. 3.

[0055] Here, the method for separating metallic materials according to a modified example of the present invention will be described with reference to the drawings. Since the heating conditions of the metallic material in the method for separating metallic materials according to this modified example are different from those in the method for separating metallic materials according to the embodiment of the present invention, the description of the same configuration as in the method for separating metallic materials according to the embodiment of the present invention will not be repeated.

[0056] FIG. 8 is a plan view showing the arrangement of crystal grain boundaries formed when a metallic material according to a modified example is heated and solidified.

[0057] As shown in Fig. 8, in the method for separating a metal material according to the modified example, the heat-melted portion 20A has an elliptical shape. The heat-melted portion 20A becomes elliptical when heated at a relatively low speed. The heating speed is, for example, less than 40 cm / min. The processing mark 24A has a convex shape toward the first end portion 11.

[0058] In this case, the grain boundaries 30A are formed continuously so as to connect from both ends in the X direction of the heated region 21A to the rear side 23A of the heat melted portion 20A. In addition, in a part of the heated region 21A, fine crystal grains are precipitated near the center in the X direction.

[0059] Fig. 9 is a plan view showing a state in which a metallic material according to a modified example is heated while being pulled. As shown in Fig. 9, the grain boundaries 30A are continuously formed so as to connect from both ends in the X direction in the heated region 21A to the rear side 23A of the heat melted portion 20A, so that a crack C is formed at a position where the grain boundaries extending in a direction substantially perpendicular to the direction in which the metallic material 10 is pulled (DR2 direction) are formed. The crack C continues along the second direction (Y direction) while meandering. As a result, the metallic material 10 is separated into a first portion 15 and a second portion 16.

[0060] When comparing this embodiment with the modified example, the metal material 10 in this embodiment can be separated by a smaller tensile stress than in the modified example.

[0061] 8, the number of grain boundaries GB2 is, for example, six on any line in the X direction. Therefore, the tensile stress that causes solidification cracking at the grain boundary 30A is dispersed among the multiple grain boundaries.

[0062] On the other hand, as shown in Fig. 7, in the method for separating a metallic material according to this embodiment, the number GB1 of crystal grain boundaries at any position in the X direction is one first crystal grain boundary 31. As a result, tensile stress is concentrated at the first crystal grain boundary 31, and solidification cracking is likely to occur at the position where the first crystal grain boundary 31 is formed. Therefore, as shown in Fig. 3, a crack C occurs at the position where the first crystal grain boundary 31 is formed. The method for separating a metallic material according to this embodiment can cause a crack C to occur in the metallic material 10 with a smaller tensile stress than the method for separating a metallic material according to the modified example.

[0063] Fig. 10 is a plan view showing an embodiment of the present invention. As shown in Fig. 10, a tensile stress was applied in one direction (X direction) to a steel plate with a thickness of 2 mm, and a melt run was performed by a TIG arc in a direction perpendicular to the one direction (Y direction), and a test was performed in which the steel plate was separated by solidification cracking. It was confirmed that a heat melted portion 20 was formed in the Y direction, and a crack C extended along the heated region 21.

[0064] Figure 11 is a graph comparing the amount of waste generated by each metal material separation method. In Figure 11, the amount of waste (dross or chips) generated during separation of a 3 mm thick steel plate over a separation length of 100 cm is compared.

[0065] As shown in Figure 11, waste materials are generated when plasma cutting, laser cutting, or machining cutting is performed without applying tensile stress to metal materials. All of these cutting methods remove part of the material being cut to separate the metal material, so with band saws or water jets, fine cutting chips are generated, and with gas or plasma cutting, powdered metal oxide (dross) is generated because high-pressure oxygen or air is sprayed to remove the molten metal. All of these are difficult to recycle, so they are treated as industrial waste.

[0066] On the other hand, in the method for separating metal material in the embodiment of the present invention, the metal material is separated by cracks generated at the grain boundaries, so that dross or chips, which are generated in fusion cutting or mechanical cutting, are not generated.

[0067] In a method for separating metallic materials according to an embodiment of the present invention, metallic material 10 is pulled in a first direction (X direction), and heated region 21 of metallic material 10 is heated so that heat-melted portion 20 is formed along a second direction (Y direction) intersecting the first direction while metallic material 10 is being pulled. This allows cracks C due to solidification cracking to occur at the coexisting interface between the solid phase and the liquid phase of metallic material 10 when heated region 21 solidifies. As a result, metallic material 10 can be separated with a simple configuration and with less waste generation compared to a case where metallic materials are separated using auxiliary materials such as welding materials, refrigerant gas, or insert materials, or by using a specific material.

[0068] In the method for separating a metallic material according to an embodiment of the present invention, the melted portion 20 has a teardrop shape with a tapered rear side 23 in the direction (DR3 direction) from the position near the first end 11 to the position near the second end 12, so that the tapered portion of the teardrop shape is along the second direction (Y direction) and the coexistence interface between the solid phase and the liquid phase can be preferentially arranged in the tapered portion of the teardrop shape, so that the coexistence interface can be arranged to intersect with the first direction in which the metallic material is pulled. As a result, in the heated region 21 of the metallic material 10, a crack C due to solidification cracking that occurs when a tensile stress is applied to the coexistence interface along a direction perpendicular to the coexistence interface can be easily generated, so that a crack C can be generated in the metallic material 10 by a small tensile stress compared to the method for separating a metallic material when the melted portion 20 is elliptical.

[0069] In a method for separating a metal material according to one embodiment of the present invention, the metal material 10 is pulled before the metal material 10 is heated, thereby ensuring that a crack C is generated in the heated region 21.

[0070] In a method for separating metallic materials according to one embodiment of the present invention, when the heated region 21 of the metallic material 10 is heated, the heated and melted portion 20 is not formed at the first end 11 and the second end 12 of the metallic material 10, thereby preventing the molten metallic material 10 from melting away due to the impact when the metallic material 10 is separated.

[0071] In a method for separating a metallic material according to an embodiment of the present invention, a heated region 21 of a metallic material 10 is heated to form a heat-melted portion 20 over the entire thickness direction (Z direction) of the metallic material 10, thereby making it possible to secure a large area of ​​a coexisting interface between a solid phase and a liquid phase in the thickness direction (Z direction) of the metallic material 10 where a crack C occurs. As a result, a crack C can be generated in the heated region 21 of the metallic material 10 with a small tensile stress.

[0072] In a method for separating metallic materials according to one embodiment of the present invention, the metallic material 10 can be separated at low cost without using auxiliary materials such as welding materials, refrigerant gas or insert materials, and without generating unnecessary waste such as powdered metal oxides (dross) or cutting chips during separation.

[0073] The method for separating metal materials according to an embodiment of the present invention can be applied to the dismantling of structures in the recycling of transport equipment such as automobiles, architectural structures, and welded or joined structures such as containers or piping. The method for separating metal materials according to an embodiment of the present invention can separate metal materials without generating waste, compared to other separation methods that can be applied to the dismantling of the above-mentioned structures, such as mechanical cutting with a band saw or the like, water jet cutting, gas cutting, or plasma cutting. As a result, the method for separating metal materials according to an embodiment of the present invention can contribute to the realization of a green society centered on a carbon-neutral and decarbonized society through resource circulation that contributes to reducing the use of natural resources and saving energy.

[0074] In the method for separating metallic materials according to the modified example of the embodiment of the present invention, the metallic material 10 is pulled in a first direction (X direction), and the heated region 21A of the metallic material 10 is heated so that the heat-melted portion 20A is formed along a second direction (Y direction) intersecting the first direction while the metallic material 10 is being pulled. This allows a crack C due to solidification cracking to occur at the coexistence interface between the solid phase and the liquid phase of the metallic material 10 in the heated region 21A. As a result, compared to a case where a metallic material is separated by using an auxiliary material such as a welding material, a refrigerant gas, or an insert material, or by using a specific material, the metallic material 10 can be separated with a simple configuration and with reduced waste generation.

[0075] [Note] As described above, the present embodiment includes the following disclosure.

[0076] [Configuration 1] Pulling the metal material (10) from a first direction; and heating the metal material (10) in a second direction intersecting the first direction in sequence from a position close to a first end (11) of the metal material (10) to a position close to a second end (12) located on the opposite side to the first end (11) in the second direction while the metal material (10) is being pulled in the first direction, thereby heating a heated region (21) of the metal material (10) so as to form a heat-melted portion (20) along the second direction, a heat-melted portion (20) is formed in a state in which the metal material (10) is pulled in the first direction, whereby a crack generated in the heated region (21) propagates and the metal material (10) is separated.

[0077] [Configuration 2] The method for separating a metal material as described in configuration 1, wherein the heat-melted portion (20) when formed has a teardrop shape with a tapered rear side (23) in a direction from a position closer to the first end (11) to a position closer to the second end (12).

[0078] [Configuration 3] 3. The method of claim 1 or 2, wherein the metal material (10) is pulled prior to heating the metal material (10).

[0079] [Configuration 4] A method for separating a metallic material according to any one of configurations 1 to 3, wherein, in heating the heated region (21) of the metallic material (10), the heated and melted portion (20) is not formed at the first end (11) and the second end (12) of the metallic material (10).

[0080] [Configuration 5] A method for separating a metallic material according to any one of configurations 1 to 4, wherein, by heating the heated region (21) of the metallic material (10), the heated and melted portion (20) is formed throughout the entire thickness direction of the metallic material (10) that intersects with the first direction and the second direction.

[0081] It should be noted that the above-mentioned embodiments disclosed herein are illustrative in all respects and are not intended to be a basis for restrictive interpretation. Therefore, the technical scope of the present disclosure should not be interpreted solely by the above-mentioned embodiments. Furthermore, all modifications within the meaning and scope equivalent to the claims are included. In the above-mentioned description of the embodiments, configurations that can be combined may be combined with each other. [Explanation of symbols]

[0082] 10 metal material, 11 first end, 12 second end, 20, 20A heated melting portion, 21, 21A heated area, 23 rear side, C crack.

Claims

1. Pulling the metallic material from a first direction; and while the metallic material is being pulled in the first direction, the metallic material is successively heated in a second direction intersecting the first direction from a position close to a first end of the metallic material to a position close to a second end located opposite to the first end, thereby heating a heated region of the metallic material so as to form a heat-melted portion along the second direction, A method for separating a metallic material, wherein the heated and molten portion is formed in a state in which the metallic material is pulled in the first direction, thereby causing a crack generated in the heated region to propagate and separate the metallic material.

2. 2. The method for separating a metallic material according to claim 1, wherein the heat-melted portion when formed has a teardrop shape tapered toward the rear side in a direction from a position closer to the first end toward a position closer to the second end.

3. The method for separating a metallic material according to claim 1 or 2, wherein the step of pulling the metallic material is performed before the step of heating the metallic material.

4. 3. The method for separating a metallic material according to claim 1, wherein, in heating the heated region of the metallic material, the heat-melted portion is not formed at the first end portion and the second end portion of the metallic material.

5. The method for separating a metallic material according to claim 1 or claim 2, wherein, by heating the heated region of the metallic material, the heated and molten portion is formed throughout the entire thickness direction of the metallic material intersecting the first direction and the second direction.

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