Work-piece manufacturing method and work-piece

Abstract

To form an open hole with a shallow angle in a bent part of a plate member.SOLUTION: A manufacturing method for a work-piece 10 has a hole forming process and a bending process. In the hole forming process, laser beam is radiated to a plate member 12 to form a linear open hole 16 penetrating the plate member 12 from one side face to the other side face, thereby providing the plate member with hole that is the plate member 12 having the open hole 16. In the bending process, at least a part of the plate member with hole is bent to form a bent part 14 at the plate member with hole. In the bending process, in association with the formation of the bent part 14, the linear open hole 16 is bent to form a curved hole 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a workpiece and to a workpiece. [Background technology]

[0002] BACKGROUND ART Conventionally, it is known to form through-holes by irradiating a plate member with laser light (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-185613 Summary of the Invention [Problem to be solved by the invention]

[0004] If it were possible to form through holes at a shallow angle relative to the surface of a plate member, passing cooling air through the through holes would allow the cooling air to flow easily along the wall surface, resulting in a plate member with high cooling efficiency. However, it is difficult to form through holes at a shallow angle in the curved portion of a plate member using conventional methods. This is because, if laser light is irradiated at a shallow angle relative to the surface of the plate member to form shallow through holes, the laser light that penetrates the plate member would irradiate the inner surface of the curved portion, damaging the irradiated surface.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] A first aspect of the present disclosure is a method for manufacturing a workpiece having a curved portion, comprising a hole forming step of irradiating a plate member with laser light to form a linear through hole that penetrates from one side of the plate member to the other side of the plate member, thereby obtaining a plate member with a hole, which is the plate member having the through hole, and a bending step of bending at least a portion of the plate member with a hole to form the curved portion in the plate member with a hole, wherein in the bending step, as the curved portion is formed, the linear through hole is bent to form a curved hole.

[0007] A second aspect of the present disclosure is a workpiece made of a plate member and having a curved portion, wherein the curved portion has a curved hole formed therein that penetrates from a first surface, which is one side of the plate member, to a second surface, which is the other side, and is curved between the first surface and the second surface, and the inner wall portion of the curved hole is harder than other portions of the plate member. [Effects of the Invention]

[0008] According to the present invention, by bending a plate member with through holes (a plate member with holes), curved holes can be formed in the curved portion. Because the holes can be formed at a relatively small angle to the surface of the workpiece, a curved plate member with high cooling efficiency can be obtained by passing cooling air through the holes. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic cross-sectional view of a gas turbine engine equipped with a combustor to which a workpiece according to this embodiment is applied. [Figure 2] FIG. 2 is a cross-sectional view of the workpiece. [Figure 3] FIG. 3 is a flowchart of a method for manufacturing a workpiece. [Figure 4] FIG. 4 is a diagram showing a plate providing step. [Figure 5] FIG. 5 is a diagram showing the hole forming step. [Figure 6] FIG. 6 is a diagram showing the bending process. DETAILED DESCRIPTION OF THE INVENTION

[0010] 1, a workpiece 10 (work) according to this embodiment can be used, for example, as a component of a combustor 50 of a gas turbine engine 40. The workpiece 10 may also be used as a component of an internal combustion engine other than the gas turbine engine 40.

[0011] In the gas turbine engine 40, the compressor wheel 42 and the turbine wheel 44 can rotate together. The shroud case 46 is a cylindrical member that surrounds the compressor wheel 42. Air is introduced into the shroud case 46. The air compressed by the compressor wheel 42 is supplied to a combustor 50 via a diffuser 48.

[0012] The combustor 50 mixes compressed air and fuel to generate combustion gas. The combustor 50 has a liner 52 and a combustion chamber 54. The liner 52 forms the wall of the combustor 50. The liner 52 is made of a metal material that can withstand the high temperatures generated by the combustion gas. Examples of such metal materials include stainless steel, nickel-based superalloys, and cobalt-based superalloys. The workpiece 10 in FIG. 1 is the liner 52 of the combustor 50. The combustion chamber 54 is a space formed within the liner 52.

[0013] The combustion gas generated in the combustion chamber 54 of the combustor 50 is supplied to the turbine wheel 44. The combustion gas rotates the turbine wheel 44. The combustion gas that has passed through the turbine wheel 44 is discharged as exhaust gas via a duct 56.

[0014] As shown in FIG. 2, the workpiece 10 is formed of a plate member 12. The plate member 12 has a curved portion 14. The curved portion 14 is formed by bending the plate member 12 in the thickness direction of the plate member 12. The radius of curvature of the curved portion 14 is, for example, 1 mm to 50 mm. The radius of curvature of the curved portion 14 is not limited to the numerical range given here and can be set as appropriate.

[0015] A plurality of through holes 16 are formed in the curved portion 14 of the workpiece 10. In other words, the workpiece 10 is a part with holes. The through holes 16 have a first opening 161 and a second opening 162. The first opening 161 is one end of the through hole 16. The first opening 161 opens on a first surface 12a, which is one surface of the plate member 12. The second opening 162 is the other end of the through hole 16. The second opening 162 opens on a second surface 12b, which is the other surface of the plate member 12.

[0016] Each through hole 16 is a cooling hole 18 for passing cooling air. The second opening 162 is an inlet for the cooling air to the cooling hole 18. The first opening 161 is an outlet for the cooling air from the cooling hole 18. The through hole 16 is a curved hole 20 curved between the first surface 12a and the second surface 12b. The curved hole 20 is curved along the curvature of the curved portion 14. Therefore, the curved hole 20 is curved so as to form a convex shape toward the outside of the curved shape of the curved portion 14. The radius of curvature of the curved shape of the curved hole 20 is, for example, 1 mm to 50 mm. The radius of curvature of the curved shape of the curved hole 20 is not limited to the numerical range given here and can be set as appropriate.

[0017] In FIG. 3, the method for manufacturing the workpiece 10 includes a plate providing step S1, a hole forming step S2, and a bending step S3.

[0018] As shown in Fig. 4, in a plate providing step S1, a plate member 12 is provided. The plate member 12 is a flat metal plate without through holes 16 (Fig. 2) formed therein. The plate member 12 has a thickness of, for example, 0.5 mm to 4 mm. The plate thickness of the plate member 12 is not limited to the numerical range given here and can be set appropriately.

[0019] As shown in Fig. 5, in the hole forming step S2, laser light L is irradiated onto the plate member 12 to form linear through holes 16 that penetrate from one surface to the other surface of the plate member 12. This results in a holed plate member 13, which is the plate member 12 having through holes 16. In the hole forming step S2, a laser device 24 outputs laser light L. The laser light L output by the laser device 24 may be a pulsed laser or a continuous wave laser. In the hole forming step S2, the relative position of the laser device 24 and the plate member 12 is changed to sequentially form a plurality of through holes 16.

[0020] In the hole forming step S2, the material of the plate member 12 is melted by the laser light L and then re-hardened. As a result, the inner wall portion 17 of the through hole 16 becomes harder than the other portions of the plate member 12. In other words, a hardened layer 17R is formed on the inner wall portion 17 of the through hole 16. The hardened layer 17R is a cylindrical portion that extends over the entire length of the through hole 16. The other portions of the plate member 12 are portions that were not melted by the irradiation of the laser light L in the hole forming step S2. Therefore, the other portions of the plate member 12 are general portions 12s in which the structure of the base material of the plate member 12 is maintained because they were not affected by the heat from the irradiation of the laser light L in the hole forming step S2.

[0021] The hardened layer 17R is also formed around the entrance and exit points of the laser light L into the plate member 12. The entrance point of the laser light L into the plate member 12 is an annular region that surrounds the through-hole 16 on the first surface 12a of the plate member 12. The exit point of the laser light L is an annular region that surrounds the through-hole 16 on the second surface 12b of the plate member 12.

[0022] The inclination angle θ of the through holes 16 with respect to the surface (first surface 12a or second surface 12b) of the plate member 12 is, for example, 10° to 45°. The inclination angle θ is not limited to the numerical range given here and can be set appropriately. The inclination angle θ is the same for each of the multiple through holes 16. The inclination angle θ may be different for each of the multiple through holes 16. The multiple through holes 16 may be formed at equal intervals or at unequal intervals.

[0023] 6, in the bending step S3, at least a portion of the holed plate member 13 is bent to form a curved portion 14 in the holed plate member 13. This forms the workpiece 10 having the curved portion 14. In the bending step S3, as the curved portion 14 is formed, the straight through hole 16 is curved to form a curved hole 20 in the curved portion 14.

[0024] In the bending step S3, for example, a press device 30 is used. The press device 30 includes a first die 32 and a second die 34. The first die 32 has a curved recess 32a. The second die 34 has a curved protrusion 34a. The perforated plate member 13 is sandwiched between the recess 32a of the first die 32 and the protrusion 34a of the second die 34, thereby bending the perforated plate member 13. As a result, a workpiece 10 is obtained that has a curved portion 14 in which a curved hole 20 is formed. Note that the bending step S3 may be performed using equipment or a jig other than the press device 30.

[0025] The method for manufacturing the workpiece 10 according to this embodiment has the following advantages.

[0026] By performing a bending process on the plate member 12 (hole plate member 13) in which the through holes 16 are formed, it is possible to form the curved holes 20 in the curved portion 14. Because the through holes 16 can be formed at a relatively small angle with respect to the surface of the workpiece 10, it is possible to obtain the plate member 12 with high cooling efficiency by passing cooling air through the through holes 16.

[0027] In the hole forming step S2 shown in Fig. 5, the material of the plate member 12 is melted and re-hardened by the laser light L, so that the inner wall portion 17 of the through hole 16 becomes harder than the other portions (general portion 12s) of the plate member 12. According to this step, the inner wall portion 17 of the through hole 16 hardens and becomes harder than the other portions, so that the blocking of the through hole 16 can be prevented when the bending step S3 shown in Fig. 6 is performed. Therefore, the curved hole 20 can be formed well.

[0028] In Fig. 1, the workpiece 10 is a component that constitutes at least a part of a combustor 50. In Fig. 2, the curved holes 20 are cooling holes 18 for passing cooling air. Because the cooling holes 18 of the combustor 50 are formed from the curved holes 20, the cooling efficiency of the combustor 50 can be improved. By improving the cooling efficiency, the life of the combustor 50 can be extended.

[0029] The following additional notes are further disclosed regarding the above embodiment.

[0030] (Appendix 1) The manufacturing method of the workpiece (10) of the present disclosure is a manufacturing method of a workpiece having a curved portion (14), and includes a hole forming step (S2) of irradiating a plate member (12) with laser light (L) to form a linear through hole (16) that penetrates from one side of the plate member to the other side, thereby obtaining a perforated plate member (13), which is the plate member having the through hole, and a bending step (S3) of bending at least a part of the perforated plate member to form the curved portion in the perforated plate member, and in the bending step, as the curved portion is formed, the linear through hole is bent to form a curved hole (20) in the curved portion.

[0031] (Appendix 2) In the method for manufacturing the workpiece described in Appendix 1, in the hole forming process, the material of the plate member may be melted and re-hardened by the laser light, so that the inner wall portion (17) of the through hole becomes harder than other portions of the plate member.

[0032] (Appendix 3) A method for manufacturing a workpiece according to appendix 1 or 2, wherein the workpiece is a component constituting at least a part of a combustor (50), and the curved hole may be a cooling hole (18) for passing cooling air.

[0033] (Appendix 4) The workpiece (10) of the present disclosure is a workpiece made of a plate member (12) having a curved portion (14), in which a curved hole (20) is formed that penetrates from a first surface (12a) that is one side of the plate member to a second surface (12b) that is the other side, and curves between the first surface and the second surface, and the inner wall portion of the curved hole is harder than other portions of the plate member.

[0034] (Appendix 5) The workpiece according to Appendix 4, wherein the workpiece is a component constituting at least a portion of a combustor (50), and the curved hole may be a cooling hole (18) for passing cooling air.

[0035] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values or mathematical expressions are used in the description of the above-described embodiments. [Explanation of symbols]

[0036] 10…Workpiece 12...Plate member 13...Perforated plate member 14...Bend 16...Through hole 20...Bent hole 50...Combustor

Claims

1. A method for manufacturing a workpiece having a curved portion, comprising: a hole forming step of irradiating a plate member with laser light to form a linear through hole penetrating from one surface to the other surface of the plate member, thereby obtaining a plate member with the through hole; a bending step of bending at least a part of the holed plate member to form the curved portion in the holed plate member, In the bending step, the straight through hole is bent to form a curved hole in the curved portion, along with forming the curved portion.

2. 2. The method for manufacturing a workpiece according to claim 1, A method for manufacturing a workpiece, wherein in the hole forming process, the material of the plate member is melted and re-hardened by the laser light, so that the inner wall portion of the through hole becomes harder than other parts of the plate member.

3. 3. The method for manufacturing a workpiece according to claim 1 or 2, the workpiece is a component constituting at least a part of a combustor, The method for manufacturing a workpiece, wherein the curved hole is a cooling hole for passing cooling air.

4. A workpiece made of a plate member and having a curved portion, The curved portion has a curved hole formed therein, the curved hole passing through from a first surface, which is one surface of the plate member, to a second surface, which is the other surface of the plate member, and curved between the first surface and the second surface, The workpiece has an inner wall portion of the curved hole that is harder than other portions of the plate member.

5. The workpiece according to claim 4, the workpiece is a component constituting at least a part of a combustor, The curved holes are cooling holes for passing cooling air through the workpiece.

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