Additive manufacturing cylindrical body and method for manufacturing the same

Abstract

To reduce strain of an additive manufacturing cylindrical body.SOLUTION: An additive manufacturing cylindrical body according to at least one embodiment of the present disclosure is formed in a cylindrical shape by using a plate-shaped member extending in a longitudinal direction. The plate-shaped member includes a planar part extending in a straight line in a cross section perpendicular to the longitudinal direction, and an uneven plate part provided with a plurality of projections projecting from an internal cavity surrounded by the plate-shaped member in the cross section to the outside of the internal cavity. The planar part includes a curved part that curves in a plate thickness direction in the cross section.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an additively manufactured tubular body and a method for manufacturing an additively manufactured tubular body. [Background technology]

[0002] Additive manufacturing, which is a method for layer-by-layer manufacturing of three-dimensional objects, is used as a method for manufacturing various metal products. In manufacturing metal products using additive manufacturing, a three-dimensional product is formed by melting metal powder, which is the material, with an energy beam such as a laser beam, and then solidifying it (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6405028 Summary of the Invention [Problem to be solved by the invention]

[0004] In the manufacturing of metal products by the additive manufacturing method, a three-dimensional product is formed by repeatedly melting and solidifying metal powder using an energy beam. The metal product thus manufactured may be subjected to a heat treatment. As a result, distortion can occur in the relatively large flat portions of metal products during additive manufacturing and subsequent heat treatment, and there is a demand for reducing this distortion.

[0005] In view of the above circumstances, at least one embodiment of the present disclosure aims to reduce distortion of an additively manufactured cylindrical body. [Means for solving the problem]

[0006] (1) An additive manufacturing tubular body according to at least one embodiment of the present disclosure, A layered tubular body formed into a tubular shape by using a plate-like member extending in a longitudinal direction, The plate-like member is A flat plate portion extending linearly in a cross section perpendicular to the longitudinal direction; a concave-convex plate portion having a plurality of protrusions formed therein, the protrusions protruding from an internal cavity surrounded by the plate-like member to an outside of the internal cavity in the cross section; having The flat plate portion has a curved portion that is curved in the plate thickness direction in the cross section.

[0007] (2) A method for producing an additively manufactured cylindrical body according to at least one embodiment of the present disclosure includes: A method for manufacturing an additively manufactured cylindrical body formed into a cylindrical shape by using a plate-like member extending in a longitudinal direction, comprising the steps of: A step of layering the plate-like members in the longitudinal direction, Equipped with In the additive manufacturing step, the plate-shaped member is additively manufactured so as to have a flat portion extending in a straight line in a cross section perpendicular to the longitudinal direction, and a concave-convex plate portion having a plurality of protrusions formed therein that protrude from an internal cavity surrounded by the plate-shaped member to the outside of the internal cavity in the cross section, and the flat portion is additively manufactured so as to have a curved portion that curves in the plate thickness direction in the cross section. Effect of the Invention

[0008] According to at least one embodiment of the present disclosure, distortion of an additively manufactured cylindrical body can be reduced. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram for explaining a configuration of a gas turbine according to the present disclosure. [Diagram 2] FIG. 2 is a view of a stator vane according to the present disclosure viewed from the pressure surface toward the suction surface. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] 13 is a cross-sectional view of some of the multiple protrusions provided on the insert. FIG. [Diagram 5] FIG. 2 is a schematic perspective view of a portion of the insert. [Figure 6] FIG. 2 is a schematic view of the insert as viewed from the trailing edge side. [Figure 7] FIG. 4 is an enlarged view of the vicinity of the leading edge in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," not only strictly express such a configuration, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions excluding the presence of other elements.

[0011] <Configuration of gas turbine according to the present disclosure> The configuration of a gas turbine that uses a turbine blade that includes an additively manufactured cylindrical body according to the present disclosure will be described below. FIG. 1 is a diagram for explaining the configuration of a gas turbine according to the present disclosure. 1, the gas turbine 1 includes a compressor 2 for generating compressed air, a combustor 4 for generating combustion gas using the compressed air and fuel, and a turbine 6 configured to be rotationally driven by the combustion gas. In the case of the gas turbine 1 for power generation, a generator (not shown) is connected to the turbine 6.

[0012] The compressor 2 includes a plurality of stator vanes 16 fixed to the compressor casing 10 side, and a plurality of rotor blades 18 attached to the rotor 8. Air taken in from an air intake 12 is sent to the compressor 2, and this air passes through the plurality of stator vanes 16 and the plurality of rotor blades 18 and is compressed to become high-temperature, high-pressure compressed air.

[0013] The combustor 4 is supplied with fuel and compressed air generated by the compressor 2, and the fuel and compressed air are mixed in the combustor 4 and then combusted to generate combustion gas, which is a working fluid for the turbine 6. A plurality of combustors 4 may be arranged in the casing 20 in the circumferential direction with the rotor at the center.

[0014] The turbine 6 has a combustion gas flow path 28 formed in the turbine casing 22, and includes a plurality of stator vanes 24 and rotor blades 26 provided in the combustion gas flow path 28. The stator vanes 24 are fixed to the turbine casing 22 side, and the plurality of stator vanes 24 arranged along the circumferential direction of the rotor 8 constitute a stator vane row. The rotor blades 26 are attached to the rotor 8, and the plurality of rotor blades 26 arranged along the circumferential direction of the rotor 8 constitute a rotor blade row. The stator vane rows and rotor blade rows are arranged alternately in the axial direction of the rotor 8.

[0015] <Configuration of Turbine Blade of the Present Disclosure> The turbine blade of the present disclosure covers both the stationary blade 24 and the moving blade 26 of the turbine 6. In the following, a turbine blade according to one embodiment of the present disclosure will be described as the stationary blade 24, but it may also be the moving blade 26.

[0016] FIG. 2 is a view of a stator vane 24 according to the present disclosure viewed in a direction from the pressure surface to the suction surface. 2, the stator vane 24 has a blade wall 34 constituting the airfoil portion 25, and the blade wall 34 extends in a direction from the hub side edge 24a to the tip side edge 24b of the stator vane 24, i.e., in the blade height direction of the stator vane 24, and an outer shroud 38 and an inner shroud 40 are provided on the tip side edge 24b and the hub side edge 24a, respectively. The blade wall 34 has a leading edge 42 and a trailing edge 44 extending along the blade height direction, and has a pressure surface 46 and a suction surface 48 extending between the leading edge 42 and the trailing edge 44.

[0017] As described later, a space 50 (see FIG. 3) is formed inside the blade wall 34, and paths 37, 39 that communicate the outside of the stator vane 24 with the space 50 are formed in the outer shroud 38 and the inner shroud 40, respectively. The paths 37, 39 are not limited to being formed in the outer shroud 38 and the inner shroud 40, respectively, and may be formed in either the outer shroud 38 or the inner shroud 40. In FIG. 2, the paths 37, 39 are each diagrammatically illustrated as being provided one by one, but a plurality of each or either one may be provided. The roles of the paths 37, 39 will be described later.

[0018] FIG. 3 is a cross-sectional view taken along line III-III of FIG. As shown in FIG. 3, a space 50 is formed inside the wing wall 34. The space 50 may be divided into a plurality of spaces, for example, three spaces 50a, 50b, and 50c, by a middle wall (partition wall) 57. The space 50 may be divided into two or more spaces by one or more partition walls 57, or the space 50 may be one space without providing the partition wall 57. An insert 51 may be inserted into the space 50. As shown in FIG. 3, when the space 50 is divided into three spaces 50a, 50b, and 50c, the insert 51 may include, for example, inserts 51a and 51b inserted into the two spaces 50a and 50b on the leading edge 42 side, or all the spaces 50a, 50b, and 50c may include the insert 51, or at least one or two of the spaces 50 may include at least one or two inserts 51.

[0019] <Insert configuration> Each of the inserts 51a, 51b has a shape having a longitudinal axis AX along the blade height direction of the stator vane 24 (direction perpendicular to the paper surface of FIG. 3), and an internal cavity 56 (56a, 56b) is formed therein. Each of the inserts 51a and 51b is formed by additive manufacturing as described below. Each of the inserts 51a and 51b is an additive manufacturing cylindrical body 61 formed into a cylindrical shape by a plate-like member 60 extending in the extension direction of a longitudinal axis AX described below.

[0020] For example, in each of the inserts 51a and 51b, the plate-like member 60 has a flat plate portion 58 extending linearly in a cross section perpendicular to the longitudinal direction, i.e., in a cross section parallel to the paper surface of Fig. 3, and an uneven plate portion 62 on which a plurality of protrusions 52 (described later) are formed that protrude from an internal cavity 56 (56a, 56b) surrounded by the plate-like member 60 to the outside of the internal cavity 56 (56a, 56b) in the cross section. The flat plate portion 58 has a curved portion 59 that curves in the plate thickness direction in the cross section. The curved portion 59 will be described in detail later.

[0021] For example, the outer surface of each of the inserts 51a, 51b is formed with a plurality of protrusions 52 that protrude toward the inner surface 34a of the blade wall 34. In each insert, the plurality of protrusions 52 extend along the blade height direction of the stator vane 24 and are formed to be arranged at intervals in the circumferential direction centered on the longitudinal axis AX. The extension direction (also referred to as the longitudinal direction) of the longitudinal axis AX of the insert 51 inserted into the space 50 of the stator vane 24 is substantially the same as the blade height direction.

[0022] The passage 37 (see Figure 2) communicates with each of the internal cavities 56a, 56b in the spaces 50a, 50b, and the passage 39 communicates with the area between the outer surface of each of the inserts 51a, 51b in the spaces 50a, 50b and the inner surface 34a of the wing wall 34, and particularly in the spaces 50a, 50b, with the recovery space 53 defined between adjacent protrusions 52, 52 in the circumferential direction of each insert 51 around the longitudinal axis AX.

[0023] Next, the configuration of the protrusion 52 will be described. FIG. 4 is a cross-sectional view of some of the multiple protrusions 52 provided on the insert 51a. FIG. 5 is a schematic perspective view of a portion of the insert 51a. FIG. 6 is a schematic diagram of the insert 51a as viewed from the rear edge 44 side. FIG. 7 is an enlarged view of the vicinity of the leading edge 42 in FIG. The configuration of the protrusion 52 described below with reference to FIGS. 4 to 7 also applies to all or some of the multiple protrusions 52 provided on the other inserts 51b.

[0024] A flow path (internal passage) 54, which is a cavity communicating with the internal cavity 56a, is formed inside the protruding portion 52. The protruding portion 52 also has a cooling hole 55 formed therein, which communicates with the internal passage 54 and opens to face the inner surface 34a of the blade wall 34. In the inserts 51a and 51b according to the present disclosure, the cooling hole 55 is formed in the tip 52a of the protruding portion 52, which is located away from the internal cavity 56a in the protruding portion 52.

[0025] 4 shows one cooling hole 55 formed in each protrusion 52, but the present invention is not limited to a configuration in which only one cooling hole 55 is formed. As described above, the protrusion 52 has a shape that extends along the blade height direction of the stator vane 24, that is, along a direction perpendicular to the paper surface of FIG. 4 as shown in FIG. 5, so that, for example, a plurality of cooling holes 55 may be formed at intervals from one another along this direction.

[0026] The length of the internal passage 54 in a direction perpendicular to the longitudinal direction (left-right direction in FIG. 4) in which the multiple protrusions 52 are lined up is referred to as the "passage width of the internal passage 54." In FIG. 4, the passage width of the internal passage 54 is constant in the direction protruding toward the inner surface 34a of the protrusion 52 (downward in FIG. 4), but there are also configurations in which the width increases or decreases toward the cooling hole 55.

[0027] The protrusions 52 may be arranged at equal intervals to uniformly cool the entire stator blade 24, or the interval between adjacent protrusions 52, 52 at a location where cooling is particularly desired may be smaller than the interval between adjacent protrusions 52, 52 at other locations. For example, the interval between the protrusions 52, 52 arranged on the ventral side of the stator blade 24 may be smaller than the interval between the protrusions 52, 52 arranged on the suction side of the stator blade 24. Furthermore, the protrusions 52 arranged on each of the ventral side and suction side of the stator blade 24 may be arranged such that the interval between adjacent protrusions 52, 52 gradually increases from the leading edge to the trailing edge of the stator blade 24. Also, the number of cooling holes 55 formed in the protrusions 52 facing the location where cooling is particularly desired may be greater than the number of cooling holes 55 formed in the protrusions 52 facing other locations.

[0028] For example, when it is found by actual measurement or simulation that a particular location becomes hot, the space 50 may be divided into a plurality of spaces by partitions 57, and the number of protrusions 52 formed on the insert 51 inserted into the space in which the hot location exists may be made greater than the number of protrusions 52 formed on the insert 51 inserted into the other spaces, so that the interval between adjacent protrusions 52, 52 in the former space is smaller than the interval between adjacent protrusions 52, 52 in the latter space. In this case, instead of changing the number of protrusions 52, the number of cooling holes 55 in the former space may be made greater than the number of cooling holes 55 in the latter space.

[0029] For example, if it is found by actual measurement or simulation that the ventral side of the stator blade 24 becomes hotter than the suction side, the number of cooling holes 55 formed in the protruding portion 52 on the ventral side of the stator blade 24 may be made greater than the number of cooling holes 55 formed in the protruding portion 52 on the suction side of the stator blade 24. Conversely, if it is found that the suction side of the stator blade 24 becomes hotter than the ventral side, the number of cooling holes 55 formed in the protruding portion 52 on the suction side of the stator blade 24 may be made greater than the number of cooling holes 55 formed in the protruding portion 52 on the ventral side of the stator blade 24.

[0030] When multiple cooling holes 55 are formed in each protrusion 52, the intervals between adjacent cooling holes 55, 55 may be equal or different. In the latter case, for example, the intervals between adjacent cooling holes 55, 55 may be gradually increased from the hub side toward the tip side, or conversely, the intervals between adjacent cooling holes 55, 55 may be gradually increased from the tip side toward the hub side.

[0031] <Cooling operation of the blade wall in the turbine blade of the present disclosure> The cooling operation of the blade wall in the turbine blade of the present disclosure will be described. As shown in FIG. 2, a cooling medium (e.g., cooling air) is supplied from the outside of the stator blade 24 to the inside of the blade wall 34 through a path 37. The cooling medium flows into each of the internal cavities 56a and 56b shown in FIG. 3. For example, the cooling medium that flows into the internal cavity 56a flows into the internal passage 54 as shown in FIG. 4, then flows into the cooling hole 55, and is ejected from the cooling hole 55 toward the inner surface 34a of the blade wall 34. The cooling medium ejected from the cooling hole 55 collides with the inner surface 34a of the blade wall 34, thereby cooling the blade wall 34. After colliding with the inner surface 34a of the blade wall 34, the cooling medium is introduced into a recovery space 53 defined between adjacent protrusions 52, 52, and is discharged to the outside of the stator blade 24 through a path 39 (see FIG. 2).

[0032] If a phenomenon occurs in which the cooling medium flows in a direction along the inner surface 34a in the vicinity of other cooling holes 55 after colliding with the inner surface 34a of the blade wall 34, that is, a cross flow, the cooling medium ejected from the other cooling holes 55 may be interfered with by the cross flow, and the cooling efficiency may decrease. In contrast, in the vane 24 having the above-mentioned configuration, the cooling medium is introduced into the recovery space 53 after colliding with the inner surface 34a of the blade wall 34, so that the cross flow can be reduced, and as a result, the risk of the cooling efficiency of the blade wall 34 decreasing can be suppressed.

[0033] <Reducing distortion in flat plate parts> As described above, each of the inserts 51a, 51b is an additively manufactured tubular body 61 formed by additive manufacturing. The additively manufactured tubular body 61 repeatedly undergoes thermal expansion and contraction during additive manufacturing. In addition, the additively manufactured tubular body 61 also undergoes thermal expansion and contraction during heat treatment after additive manufacturing. Due to such thermal expansion and contraction of the additively manufactured tubular body 61, there is a risk that distortion will occur in the plate thickness direction of the flat plate portion 58, which has a relatively large area.

[0034] Therefore, in the layered manufactured cylindrical body 61 according to the present disclosure, a curved portion 59 that is curved in the plate thickness direction in a cross section perpendicular to the longitudinal direction is provided. As a result, even if the above-mentioned thermal expansion and contraction occurs, the curved portions 59 provided on the flat plate portion 58 expand and contract to absorb the thermal expansion and contraction. This reduces distortion in the thickness direction of the flat plate portion 58. Therefore, distortion of the additively manufactured cylindrical body 61 can be reduced. If the additively manufactured cylindrical body 61 according to the present disclosure is the inserts 51a, 51b inserted into the wing walls 34 as described above, the distortion in the plate thickness direction of the flat plate portion 58 can be reduced, making it difficult for the inserts 51a, 51b to interfere with the walls (e.g., the partition wall 57) that define the spaces 50a, 50b when inserted into the spaces 50a, 50b. This makes it easier to insert the inserts 51a, 51b into the spaces 50a, 50b.

[0035] In the additively manufactured cylindrical body 61 according to the present disclosure, the curved portion 59 may extend in the longitudinal direction. As a result, even if the above-mentioned thermal expansion and contraction occurs, the thermal expansion and contraction can be efficiently absorbed by the curved portions 59 provided on the flat plate portion 58, and the distortion of the flat plate portion 58 in the plate thickness direction can be further reduced. If the additively manufactured cylindrical body 61 according to the present disclosure is the inserts 51a, 51b inserted into the wing walls 34 as described above, the distortion in the plate thickness direction of the flat plate portion 58 can be further reduced, making it even less likely to interfere with the wall portion (e.g., the partition wall 57) that defines the spaces 50a, 50b when the inserts 51a, 51b are inserted into the spaces 50a, 50b. This makes it even easier to insert the inserts 51a, 51b into the spaces 50a, 50b.

[0036] 3, 6, and 7, only one curved portion 59 is provided on one surface of the flat plate portion 58, as shown in Fig. 6. However, a plurality of curved portions 59 may be provided on one surface of the flat plate portion 58 at intervals in the extending direction of the surface of the flat plate portion 58 and in the direction intersecting the wing height direction. By increasing the number of curved portions 59, it is expected that the effect of reducing distortion of the flat plate portion 58 can be improved. However, increasing the number of curved portions 59 that convex toward the internal cavity 56 reduces the cross-sectional area of ​​the internal cavity 56 in a cross section perpendicular to the longitudinal direction. Therefore, the number of curved portions 59 should be appropriately set from the viewpoint of ensuring the cross-sectional area and from the viewpoint of the effect of reducing distortion of the flat portion 58. In addition, since the size of the spaces 50a and 50b is limited, when a curved portion 59 that is convex from the internal cavity 56 toward the outside of the internal cavity 56 is provided, the flat portions 58 on both sides of the curved portion 59 move toward the internal cavity 56 more than the curved portion 59. Therefore, the cross-sectional area of ​​the internal cavity 56 is reduced compared to when a curved portion 59 that is convex toward the internal cavity 56 is provided.

[0037] In the additively manufactured cylindrical body 61 according to the present disclosure, the multiple protrusions 52 and the curved portion 59 may extend in the longitudinal direction. This makes it possible to provide multiple protrusions 52 extending in the longitudinal direction, and even if thermal expansion and contraction as described above occurs, the thermal expansion and contraction can be efficiently absorbed by the curved portions 59 provided on the flat portion 58. If the additively manufactured cylindrical body 61 according to the present disclosure has the inserts 51a, 51b that are inserted into the wing wall 34 as described above, a plurality of protrusions 52 extending in the wing height direction can be provided.

[0038] In the layered manufacturing tubular body 61 according to the present disclosure, the multiple protrusions 52 may be arranged at intervals in a direction perpendicular to the longitudinal direction. This allows a plurality of protrusions 52 to be provided that are spaced apart in a direction perpendicular to the longitudinal direction. If the additively manufactured cylindrical body 61 according to the present disclosure includes inserts 51a, 51b that are inserted into the inside of the wing wall 34 as described above, a plurality of protrusions 52 can be provided spaced apart in a direction perpendicular to the wing height direction.

[0039] In the additively manufactured cylindrical body 61 according to the present disclosure, like the insert 51a, the multiple protrusions 52 may extend radially in a cross section perpendicular to the longitudinal direction. This allows a plurality of protrusions 52 to be provided that extend radially in the cross section. If the additively manufactured cylindrical body 61 according to the present disclosure is the insert 51a inserted into the interior of the blade wall 34 as described above, the tip 52a of the protrusion 52 can be arranged along the shape of the inner surface 34a of the blade wall 34 in the vicinity of the leading edge 42. If a cooling hole 55 is formed in the tip 52a, as in the insert 51a according to the present disclosure, the blade wall 34 can be efficiently cooled.

[0040] In the additively manufactured cylindrical body 61 according to the present disclosure, each of the multiple protrusions 52 may have an internal passage 54 that communicates with the internal cavity 56 and extends from the internal cavity 56 to the outside of the internal cavity 56 in a cross section perpendicular to the longitudinal direction. Each of the multiple protrusions 52 may have a plurality of communication holes (cooling holes 55) formed at the end (tip 52a) facing the outside of the protrusion 52, which communicates with the internal cavity 56 and an external space (space 50) separated by the plate-like member 60. This results in an additively molded cylindrical body 61 having multiple communication holes (cooling holes 55) at the outward-facing end (tip 52a) of the protrusion 52 that connect the internal cavity 56 to the external space (space 50) via the internal passage 54. When the additively manufactured cylindrical body 61 according to the present disclosure is the insert 51a, 51b that is inserted into the inside of the wing wall 34 as described above, the insert 51a, 51b is obtained having a plurality of cooling holes 55 provided at the tip 52a of the protrusion 52 that connect the internal cavities 56a, 56b and the spaces 50a, 50b via the internal passage 54.

[0041] In the additively manufactured cylindrical body 61 according to the present disclosure, the width of the internal passage 54 as seen in a cross section perpendicular to the longitudinal direction may be constant within at least a portion of the range from the internal cavity 56 to the communicating hole (cooling hole 55) regardless of the distance from the internal cavity 56. As a result, the passage width of the internal passage 54 that appears in the cross section is constant within a portion of the internal passage 54 .

[0042] In the additively manufactured cylindrical body 61 according to the present disclosure, the curved portion 59 may be provided in a central region 58f of the flat portion 58, away from a one-side end region 58b including one end portion 58a in a cross section perpendicular to the longitudinal direction, and from a other-side end region 58d including the other end portion 58c. As a result, even if the above-mentioned thermal expansion and contraction occurs, the curved portion 59 provided in the flat portion 58 can efficiently absorb the thermal expansion and contraction, compared to when the curved portion 59 is provided in a region away from the central region 58f toward one end portion 58a or the other end portion 58c.

[0043] In the additively manufactured cylindrical body 61 according to the present disclosure, the curved portion 59 may have a shape that is convex toward the internal cavity 56 . This prevents the curved portion 59 from protruding toward the outside of the internal cavity 56, thereby reducing the possibility that the curved portion 59 will affect the ease of insertion when the additively manufactured cylindrical body 61 is inserted into another component. If the additively manufactured cylindrical body 61 according to the present disclosure is the insert 51a, 51b that is inserted into the wing wall 34 as described above, the curved portion 59 is less likely to interfere with the wall portion (e.g., the partition wall 57) that defines the space 50a, 50b during insertion into the space 50a, 50b. This makes it easier to insert the insert 51a, 51b into the space 50a, 50b.

[0044] In addition, in the case where the curved portion 59 is allowed to protrude toward the outside of the internal cavity 56 , the curved portion 59 may be formed so as to protrude toward the outside of the internal cavity 56 .

[0045] In the additively manufactured cylindrical body 61 according to the present disclosure, the amount of protrusion H of the curved portion 59 in the plate thickness direction (the amount by which the top of the curved portion 59 protrudes from the surface of the flat portion 58: see Figure 7) is preferably smaller than the amount of protrusion of the multiple protrusions 52 from the internal cavity 56 to the outside of the internal cavity 56 (the length L of the protrusion 52 extending from the outer surface of the insert 51a toward the inner surface 34a of the wing wall 34: see Figure 4). As a result, even if the protrusion amount H is relatively small, the above-mentioned thermal expansion and contraction can be absorbed and the distortion of the flat plate portion 58 in the plate thickness direction can be reduced.

[0046] In the layered manufacturing tubular body 61 according to the present disclosure, the amount of protrusion H of the curved portion 59 in the plate thickness direction is preferably three times or less the plate thickness T (see FIG. 7) of the flat portion 58 other than the curved portion 59. As a result, even if the protrusion amount H is relatively small, the above-mentioned thermal expansion and contraction can be absorbed and the distortion of the flat plate portion 58 in the plate thickness direction can be reduced.

[0047] In the layered manufacturing tubular body 61 according to the present disclosure, the plate thickness Ta of the curved portion 59 (see FIG. 7) is preferably equal to or smaller than the plate thickness T of the flat portion 58 other than the curved portion 59. This allows the curved portion 59 to expand and contract more easily, making it easier to absorb the thermal expansion and contraction described above, and therefore makes it possible to effectively reduce distortion in the plate thickness direction.

[0048] In the additively manufactured cylindrical body 61 of the present disclosure, at least one of the flat portion 58, the one-side end region 58b including the one-side end portion 58a in a cross-section perpendicular to the longitudinal direction, or the other-side end region 58d including the other-side end portion 58c, may form part of at least one protrusion 52. Since a part of the flat portion 58 constitutes a part of at least one protruding portion 52, the flat portion 58 becomes larger by an amount corresponding to the protruding amount (length L) of the protruding portion 52. If the flat portion 58 becomes larger, there is a risk that strain in the flat portion 58 in the plate thickness direction will become larger. According to the above configuration, even if the flat portion 58 becomes larger because a part of the flat portion 58 forms part of the protruding portion 52, the thermal expansion and contraction as described above can be absorbed by the curved portion 59, and the distortion of the flat portion 58 in the thickness direction can be effectively reduced.

[0049] For example, in the insert 51a arranged in the space 50a closest to the leading edge 42, a portion of the protrusion 52 located closest to the trailing edge 44, specifically, the wall portion of the protrusion 52 closer to the trailing edge 44 than the internal passage 54, is formed by a portion of the flat plate portion 58.

[0050] For example, in the insert 51b arranged in the space 50b, a portion of the protrusion 52 located closest to the leading edge 42, specifically, the wall portion on the leading edge 42 side of the internal passage 54 of the protrusion 52, is constituted by a portion of the flat portion 58, and a portion of the protrusion 52 located closest to the trailing edge 44, specifically, the wall portion on the trailing edge 44 side of the internal passage 54 of the protrusion 52, is constituted by a portion of the flat portion 58.

[0051] However, for example, in the insert 51a arranged in the space 50a closest to the leading edge 42, the wall portion on the trailing edge 44 side of the internal passage 54 of the protrusion 52 located closest to the trailing edge 44 may be located closer to the leading edge 42 than the flat portion 58.

[0052] Also, for example, in an insert 51b arranged in space 50b, the wall portion on the leading edge 42 side of the internal passage 54 of the protrusion 52 located closest to the leading edge 42 may be located on the trailing edge 44 side of the flat plate portion 58 on the leading edge 42 side. For example, in an insert 51b arranged in space 50b, the wall portion on the trailing edge 44 side of the internal passage 54 of the protrusion 52 located closest to the trailing edge 44 may be located on the leading edge 42 side of the flat plate portion 58 on the trailing edge 44 side.

[0053] In the layered manufacturing tubular body 61 according to the present disclosure, the layered manufacturing tubular body 61 may be the inserts 51a and 51b described above. This allows the relatively complex inserts 51a, 51b to be manufactured relatively easily, and also reduces distortion of the flat plate portion 58 in the plate thickness direction, allowing the inserts 51a, 51b to be inserted into the spaces 50a, 50b of the airfoil portion 25 relatively easily.

[0054] In the additively manufactured cylindrical body 61 of the present disclosure, the end (tip 52a) of the protrusion 52 facing outward from the internal cavity may face the inner surface 34a at a position between adjacent protrusions 52 and closer to the inner surface 34a of the wing wall 34 than the area 64 in which no protrusions 52 are provided in the uneven plate portion 62. This allows the cooling air supplied to the internal cavity 56 to be sprayed onto the inner surface 34a of the blade wall 34 through the internal passage 54 and the cooling holes 55, thereby allowing the blade wall 34 to be efficiently cooled.

[0055] In the layered manufactured cylindrical body 61 according to the present disclosure, the outer surface 58e of the flat plate portion 58 may face a surface 57a of a partition wall 57 that divides the internal space (space 50) of the aerofoil portion 25 and extends in the wing height direction. This allows the inserts 51a, 51b to be efficiently stored in the spaces 50a, 50b of the airfoil portion 25 that are partitioned by the partition wall 57. Furthermore, with the above configuration, distortion of the flat plate portion 58 in the plate thickness direction is reduced, making it difficult for the flat plate portion 58 to interfere with the partition wall 57. This makes it possible to insert the inserts 51a, 51b into the spaces 50a, 50b of the airfoil portion 25 relatively easily.

[0056] <Method of manufacturing a cylindrical body by additive manufacturing> The additive manufacturing cylindrical body 61 according to the present disclosure can be manufactured by additive manufacturing using a powder bed method or an LMD (Laser Metal Deposition) method. The method for manufacturing an additively manufactured tubular body according to the present disclosure is a method for manufacturing an additively manufactured tubular body 61 formed into a cylindrical shape by using plate-like members 60 extending in the longitudinal direction. The method for manufacturing an additively manufactured tubular body according to the present disclosure includes a step S1 of additively manufacturing the plate-like members 60 by stacking them in the longitudinal direction.

[0057] In step S1 of additive manufacturing, the plate-shaped member 60 is additively manufactured so as to have a flat portion 58 extending in a straight line in a cross section perpendicular to the longitudinal direction, and an uneven plate portion 62 having a plurality of protrusions 52 formed thereon that protrude from an internal cavity 56 surrounded by the plate-shaped member 60 to the outside of the internal cavity 56 in the cross section, and the flat portion 58 is additively manufactured so as to have a curved portion 59 that curves in the plate thickness direction in the cross section.

[0058] In this way, the layered manufacturing cylindrical body 61 according to the present disclosure can be obtained. Furthermore, according to the method for manufacturing an additively manufactured tubular body according to the present disclosure, even if repeated thermal expansion and contraction occurs during additive manufacturing, the thermal expansion and contraction can be absorbed by expanding and contracting the curved portion 59 provided on the flat portion 58. This reduces distortion in the plate thickness direction of the flat portion 58, and an additively manufactured tubular body 61 with relatively little distortion can be obtained.

[0059] The present disclosure is not limited to the above-described embodiments, and includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0060] The contents described in each of the above embodiments can be understood, for example, as follows. (1) An additively manufactured tubular body 61 according to at least one embodiment of the present disclosure is an additively manufactured tubular body formed into a cylindrical shape by a plate-like member 60 extending in the longitudinal direction. The plate-like member 60 has a flat plate portion 58 extending linearly in a cross section perpendicular to the longitudinal direction, and an uneven plate portion 62 on which a plurality of protrusions 52 are formed that protrude from an internal cavity 56 surrounded by the plate-like member 60 to the outside of the internal cavity 56 in the cross section. The flat plate portion 58 has a curved portion 59 that is curved in the plate thickness direction in the cross section.

[0061] According to the above configuration (1), even if the above-mentioned thermal expansion and contraction occurs, the curved portion 59 provided on the flat plate portion 58 expands and contracts to absorb the thermal expansion and contraction. This reduces distortion in the thickness direction of the flat plate portion 58. Therefore, distortion of the additively manufactured cylindrical body 61 can be reduced.

[0062] (2) In some embodiments, in the configuration of (1) above, the curved portion 59 may extend in the longitudinal direction.

[0063] According to the above configuration (2), even if the above-mentioned thermal expansion and contraction occurs, the thermal expansion and contraction can be efficiently absorbed by the curved portion 59 provided on the flat plate portion 58.

[0064] (3) In some embodiments, in the configuration of (1) above, the multiple protrusions 52 and the curved portion 59 may extend in the longitudinal direction.

[0065] According to the above configuration (3), multiple protrusions 52 extending in the longitudinal direction can be provided, and even if the above-mentioned thermal expansion and contraction occurs, the thermal expansion and contraction can be efficiently absorbed by the curved portion 59 provided on the flat portion 58.

[0066] (4) In some embodiments, in any of the configurations (1) to (3) above, the multiple protrusions 52 may be arranged at intervals in a direction perpendicular to the longitudinal direction.

[0067] According to the above configuration (4), a plurality of protruding parts 52 can be provided that are spaced apart in a direction perpendicular to the longitudinal direction.

[0068] (5) In some embodiments, in the configuration of (4) above, the multiple protrusions 52 may extend radially in the cross section.

[0069] According to the above configuration (5), a plurality of protrusions 52 extending radially in the cross section can be provided.

[0070] (6) In some embodiments, in any of the configurations (1) to (5) above, each of the multiple protrusions 52 may have an internal passage 54 that communicates with the internal cavity 56 and extends from the internal cavity 56 toward the outside in the cross section. Each of the multiple protrusions 52 may have a plurality of communication holes (cooling holes 55) that are formed at the end (tip 52a) facing the outside of the protrusion 52 and communicate the internal cavity 56 with an external space (space 50) separated by the plate-shaped member 60.

[0071] According to the above configuration (6), an additively molded cylindrical body 61 is obtained in which a plurality of communication holes (cooling holes 55) are provided at the outward-facing end (tip 52a) of the protrusion 52, which communicates between the internal cavity 56 and the external space (space 50) via the internal passage 54.

[0072] (7) In some embodiments, in the configuration of (6) above, the internal passage 54 may have a passage width (passage width of the internal passage 54) that appears in the cross section regardless of the distance from the internal cavity 56 within at least a portion of the range from the internal cavity 56 to the communication hole (cooling hole 55).

[0073] According to the above configuration (7), the passage width that appears in the cross section (the passage width of the internal passage 54) may be constant within a portion of the internal passage 54.

[0074] (8) In some embodiments, in any of the configurations (1) to (7) above, the curved portion 59 may be provided in a central region 58f of the flat portion 58, away from one-side end region 58b including one end portion 58a in the cross section, and from the other-side end region 58d including the other end portion 58c.

[0075] According to the above configuration (8), even if the above-mentioned thermal expansion and contraction occurs, the thermal expansion and contraction can be efficiently absorbed by the curved portion 59 provided in the flat portion 58, as compared with the case where the curved portion 59 is provided in a region away from the central region 58f toward the one end portion 58a or the other end portion 58c.

[0076] (9) In some embodiments, in any of the configurations (1) to (8) above, the curved portion 59 may have a shape that is convex toward the internal cavity 56.

[0077] According to the above configuration (9), when the layered manufacturing cylindrical body 61 is inserted into another member, the possibility that the curved portion 59 will affect the ease of insertion can be reduced.

[0078] (10) In some embodiments, in any of the configurations (1) to (9) above, the amount of protrusion H of the curved portion 59 in the plate thickness direction may be smaller than the amount of protrusion (length L) of the multiple protruding portions 52 from the internal cavity 56 to the outside of the internal cavity 56.

[0079] According to the above configuration (10), even if the protrusion amount H is relatively small, the above-mentioned thermal expansion and contraction can be absorbed and the distortion in the plate thickness direction of the flat plate portion 58 can be reduced.

[0080] (11) In some embodiments, in the configuration of (10) above, the amount of protrusion H of the curved portion 59 in the plate thickness direction may be three times or less the plate thickness T of the flat portion 58 other than the curved portion 59.

[0081] According to the above configuration (11), even if the protrusion amount H is relatively small, the above-mentioned thermal expansion and contraction can be absorbed and the distortion in the plate thickness direction of the flat plate portion 58 can be reduced.

[0082] (12) In some embodiments, in any of the configurations (1) to (11) above, the plate thickness Ta of the curved portion 59 may be equal to or smaller than the plate thickness T of the flat portion 58 other than the curved portion 59.

[0083] According to the above configuration (12), the curved portion 59 can easily expand and contract, and can more easily absorb the above-mentioned thermal expansion and contraction, so that the distortion in the plate thickness direction can be effectively reduced.

[0084] (13) In some embodiments, in any of the configurations (1) to (12) above, at least one of the one-side end region 58b including the one-side end 58a in the cross section of the flat plate portion 58, or the other-side end region 58d including the other-side end 58c, may form part of at least one protrusion 52.

[0085] Since a part of the flat portion 58 constitutes a part of at least one protruding portion 52, the flat portion 58 becomes larger by an amount corresponding to the protruding amount (length L) of the protruding portion 52. If the flat portion 58 becomes larger, there is a risk that strain in the flat portion 58 in the plate thickness direction will become larger. According to the above configuration (13), even if the flat portion 58 becomes large because a part of the flat portion 58 constitutes a part of the protruding portion 52, the thermal expansion and contraction as described above can be absorbed by the curved portion 59, and the distortion of the flat portion 58 in the thickness direction can be effectively reduced.

[0086] (14) In some embodiments, in any of the configurations (1) to (13) above, the additively molded cylindrical body 61 may be an insert member (insert 51) to be inserted into the internal space (space 50) of the airfoil portion 25 of the turbine blade (the stator blade 24 or the rotor blade 26).

[0087] According to the above configuration (14), a relatively complex insert member (insert 51) can be manufactured relatively easily, and distortion of the flat plate portion 58 in the plate thickness direction is reduced, so that it can be inserted relatively easily into the internal space (space 50) of the airfoil portion 25.

[0088] (15) In some embodiments, in the configuration of (14) above, each of the multiple protrusions 52 may have an internal passage 54 that communicates with the internal cavity 56 and extends from the internal cavity 56 toward the outside in the cross section. Each of the multiple protrusions 52 may have a plurality of communication holes (cooling holes 55) formed at an end (tip 52a) facing the outside of the protrusion 52, communicating the internal cavity 56 with an external space (space 50) separated by the plate-like member 60. The end (tip 52a) facing the outside of the protrusion 52 may face the inner surface 34a of the blade wall 34 of the turbine blade (stator blade 24 or rotor blade 26) at a position between adjacent protrusions 52 and closer to the inner surface 34a of the blade wall 34 of the turbine blade (stator blade 24 or rotor blade 26) than a region 64 in which the protrusions 52 are not provided in the uneven plate portion 62.

[0089] According to the above configuration (15), the cooling air supplied to the internal cavity 56 can be sprayed onto the inner surface 34a of the blade wall 34 through the internal passage 54 and the communication hole (cooling hole 55), thereby efficiently cooling the blade wall 34.

[0090] (16) In some embodiments, in the configuration of (14) or (15) above, the outer surface 58e of the flat plate portion 58 may face a surface 57a of a partition wall 57 that divides the internal space (space 50) of the aerofoil portion 25 and extends in the wing height direction.

[0091] According to the above configuration (16), the insert member (insert 51) can be efficiently stored in the internal space (space 50) of the aerofoil portion 25 partitioned by the partition wall 57. Also, according to the above configuration (15), distortion of the flat plate portion 58 in the plate thickness direction is reduced, so that the flat plate portion 58 and the partition wall 57 are less likely to interfere with each other, and the insert member (insert 51) can be inserted relatively easily into the internal space (space 50) of the aerofoil portion 25.

[0092] (17) A method for manufacturing an additively manufactured tubular body according to at least one embodiment of the present disclosure is a method for manufacturing an additively manufactured tubular body 61 formed into a cylindrical shape by a plate-like member 60 extending in the longitudinal direction. The method for manufacturing an additively manufactured tubular body according to at least one embodiment of the present disclosure includes a step S1 of additively manufacturing the plate-like member 60 so as to be laminated in the longitudinal direction. In the additively manufactured step S1, the plate-like member 60 is additively manufactured to have a flat plate portion 58 extending linearly in a cross section perpendicular to the longitudinal direction, and an uneven plate portion 62 having a plurality of protrusions 52 formed thereon that protrude from an internal cavity 56 surrounded by the plate-like member 60 to the outside of the internal cavity 56 in the cross section, and the flat plate portion 58 is additively manufactured to have a curved portion 59 that is curved in the plate thickness direction in the cross section.

[0093] According to the method (17) above, even if repeated thermal expansion and contraction occurs during additive manufacturing, the thermal expansion and contraction can be absorbed by the expansion and contraction of the curved portion 59 provided on the flat plate portion 58. This reduces distortion in the plate thickness direction of the flat plate portion 58, and an additively manufactured cylindrical body 61 with relatively little distortion can be obtained. [Explanation of symbols]

[0094] 1. Gas turbine 6. Turbine 24 Stator blade 26 Moving blade 34 Wing wall 34a Inside 42 Leading Edge 44 Trailing edge 50,50a,50b space 51, 51a, 51b Insert 52 Protrusion 54 Flow passage (internal passage) 55 Communication hole (cooling hole) 56,56a,56b internal cavity 57 Middle wall (partition wall) 58 Flat plate part 59 Curved section 60 Plate-shaped member 61 Additive manufacturing cylindrical body 62 Uneven plate part

Claims

1. A layered tubular body formed into a tubular shape by using a plate-like member extending in a longitudinal direction, The plate-like member is A flat plate portion extending linearly in a cross section perpendicular to the longitudinal direction; a concave-convex plate portion having a plurality of protrusions formed therein, the protrusions protruding from an internal cavity surrounded by the plate-like member to an outside of the internal cavity in the cross section; having The flat plate portion has a curved portion that is curved in the plate thickness direction in the cross section. Additive manufacturing cylindrical body.

2. The curved portion extends in the longitudinal direction. The layered manufactured cylindrical body according to claim 1 .

3. The plurality of protrusions and the curved portion extend in the longitudinal direction. The layered manufactured cylindrical body according to claim 1 .

4. At least some of the plurality of protrusions are disposed at intervals in a direction perpendicular to the longitudinal direction and intersecting a protruding direction of the protrusions. The layered manufactured cylindrical body according to claim 1 .

5. The plurality of protrusions extend radially in the cross section. The layered manufactured cylindrical body according to claim 4 .

6. Each of the plurality of protrusions is an internal passageway communicating with the internal cavity and extending from the internal cavity toward the outside at the cross section; a plurality of communication holes formed at the end of the protrusion facing outward, the communication holes communicating the internal cavity with an external space separated by the plate-like member; having The layered manufactured cylindrical body according to claim 1 .

7. the internal passage has a passage width that appears in the cross section in a constant manner regardless of a distance from the internal cavity within at least a portion of a range from the internal cavity to the communication hole in the cross section; The layered manufactured cylindrical body according to claim 6 .

8. The curved portion is provided in a central region of the flat plate portion, the central region being away from a one-side end region including an end on one side in the cross section and a other-side end region including an end on the other side. The layered manufactured cylindrical body according to claim 1 .

9. The curved portion has a shape that is convex toward the internal cavity. The layered manufactured cylindrical body according to claim 1 .

10. A protruding amount of the curved portion in the plate thickness direction is smaller than a protruding amount of the plurality of protruding portions from the internal cavity to the outside of the internal cavity. The layered manufactured cylindrical body according to claim 1 .

11. The amount of protrusion of the curved portion in the plate thickness direction is three times or less than the plate thickness of the flat portion other than the curved portion. The layered manufactured cylindrical body according to claim 10.

12. The plate thickness of the curved portion is equal to or less than the plate thickness of the flat portion other than the curved portion. The layered manufactured cylindrical body according to claim 1 .

13. At least one of a one-side end region including an end portion on one side in the cross section and an other-side end region including an end portion on the other side in the cross section of the flat plate portion constitutes a part of at least one of the protruding portions. The layered manufactured cylindrical body according to claim 1 .

14. The additively manufactured cylindrical body is an insert member to be inserted into an internal space of an airfoil portion of a turbine blade. The layered manufactured cylindrical body according to claim 1 .

15. Each of the plurality of protrusions is an internal passageway communicating with the internal cavity and extending from the internal cavity toward the outside at the cross section; a plurality of communication holes formed at the end of the protrusion facing outward, the communication holes communicating the internal cavity with an external space separated by the plate-like member; having the outwardly facing end of the protrusion faces the inner surface at a position between adjacent protrusions and closer to the inner surface of the blade wall of the turbine blade than a region of the uneven plate portion where the protrusions are not provided. The additively manufactured cylindrical body according to claim 14.

16. The outer surface of the flat plate portion faces a surface of a bulkhead that divides the internal space of the aerofoil portion and extends in the wing height direction. The additively manufactured cylindrical body according to claim 14.

17. A method for manufacturing an additively manufactured cylindrical body formed into a cylindrical shape by using a plate-like member extending in a longitudinal direction, comprising the steps of: A step of layering the plate-like members in the longitudinal direction, Equipped with In the additive manufacturing step, the plate-like member is additively manufactured to have a flat plate portion extending linearly in a cross section perpendicular to the longitudinal direction, and a concave-convex plate portion having a plurality of protrusions formed therein that protrude from an internal cavity surrounded by the plate-like member to the outside of the internal cavity in the cross section, and the flat plate portion is additively manufactured to have a curved portion that curves in a plate thickness direction in the cross section. A method for manufacturing an additively manufactured cylindrical body.

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