JP7525458B2 - Manufacturing method of a molded object and molded object - Google Patents

Description

The present invention relates to a method for manufacturing a molded object and a molded object.

In recent years, there has been an increasing need for 3D printers as a means of production, and research and development is being conducted in the aircraft industry, etc., with a view to practical application of 3D printers to metal materials in particular. 3D printers that use metal materials use a heat source such as a laser or arc to melt metal powder or metal wire, and then layer the molten metal to create a model.

For example, one technique for manufacturing a rotor with blades is to form blades by laminating weld beads around a central shaft (see, for example, Patent Document 1).

JP 2019-155463 A

By the way, the cooling performance of the blades can be improved by forming internal flow passages along the surfaces of the blades (wings) of the rotor as described above and flowing a cooling medium through the internal flow passages. The internal flow passages can be easily formed by machining such as cutting if the flow passage shape is simple, but it is difficult to form internal flow passages with complex shapes by machining. It is also possible to form the internal flow passages by casting, but in that case, a dedicated core must be used, which increases manufacturing costs. Moreover, casting using a core not only complicates the manufacturing process, but it is also difficult to remove the core after molding.

The present invention was made in consideration of the above circumstances, and its purpose is to provide a method for manufacturing a molded object that can easily and at low cost produce a molded object having a flow path along a wing portion, and the molded object.

The present invention comprises the following configurations.
(1) A method for manufacturing a shaped object including a shaped portion having a wing portion formed by laminating a weld bead formed by melting and solidifying a filler metal on an outer periphery of a rod-shaped shaft, the method comprising the steps of:
When forming the shaping portion, a wing portion forming step is performed in which the weld bead is formed along the extension direction of the wing portion to form the wing portion,
In the wing portion forming process,
a blade flow passage forming step is performed in which, when stacking the weld beads, gaps are provided between the weld beads to form hollow portions, thereby forming blade flow passages surrounded by the weld beads in an axial cross-sectional view along an extension direction of the weld beads.
A method for manufacturing a sculpture.
(2) A rod-shaped shaft body;
a shaped portion provided on an outer periphery of the shaft body and having wings shaped by laminating welding beads formed by melting and solidifying a filler metal;
a wing passage formed along the wing in the shaping portion;
an internal flow passage formed around the shaft;
having
A sculpture.

The present invention makes it possible to easily and inexpensively manufacture a molded object having a flow path along the wing portion.

FIG. 2 is a perspective view of a shaped object manufactured by the manufacturing method of the present invention. FIG. 2 is a perspective view of a cooling passage formed inside a molded object. 2 is a cross-sectional view taken along line II in FIG. 1. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 1 is a schematic diagram illustrating the configuration of a manufacturing system for manufacturing a shaped object. 10A to 10C are schematic side views taken along the axial direction of a part of a manufactured object, illustrating a manufacturing process of the manufactured object. 10A to 10C are schematic side views taken along the axial direction of a part of a manufactured object, illustrating a manufacturing process of the manufactured object. 10A to 10C are schematic side views taken along the axial direction of a part of a manufactured object, illustrating a manufacturing process of the manufactured object. 13A to 13C are diagrams illustrating a blade passage forming step for forming a trapezoidal cross-sectional portion of the blade passage, and are schematic plan views of the shaping portion. 1A to 1C are diagrams illustrating a blade passage forming step for forming a trapezoidal cross-sectional portion of the blade passage, and are schematic cross-sectional views of the shaping portion. 13A to 13C are diagrams illustrating a blade passage forming step for forming a curved cross-sectional portion of the blade passage, and are schematic plan views of the shaping portion. 1A to 1C are diagrams illustrating a blade passage forming step for forming a curved cross-sectional portion of the blade passage, and are schematic cross-sectional views of a shaping portion.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
Fig. 1 is a perspective view of a molded object W manufactured by a manufacturing method of the present invention. Fig. 2 is a perspective view of a cooling passage 61 formed inside the molded object W.

As shown in FIG. 1, the object W has a shaft body 51 and a molded portion 53 molded on the outer periphery of the shaft body 51, and a blade (wing portion) 55 is formed on the molded portion 53.

The shaft body 51 is, for example, a round bar with a circular cross section, such as a steel bar. The blades 55 of the shaping portion 53 provided on the outer periphery of this shaft body 51 are formed in a shape in which the portion protruding toward the outer periphery is twisted spirally in the axial direction. The shaping portion 53 having these blades 55 is shaped by forming and layering a weld bead around the shaft body 51. The shaping portion 53 shaped by the weld bead is then cut to form the target shape by cutting the surface.

As shown in FIG. 2, the object W has a cooling flow path 61 inside. This cooling flow path 61 is a flow path through which a cooling medium such as cooling water flows, and the object W is cooled by flowing the cooling medium through this cooling flow path 61.

The cooling passage 61 has a pair of blade passages 63, an internal passage 65, and multiple connecting passages 67.

The wing passages 63 are provided inside each blade 55 and extend along the blade 55. Each wing passage 63 is provided at a position that is point-symmetrical with respect to the axis of the object W. These wing passages 63 are formed in the molded portion 53 of the object W.

The internal flow passage 65 is provided closer to the center of the wing flow passage 63 in the molded object W, and is formed in a spiral shape in the axial direction. This internal flow passage 65 is formed on the outer periphery of the shaft body 51.

The connection flow paths 67 are formed in pairs near both ends of the molded object W, and are formed along the radial direction. Each connection flow path 67 is connected to the end of the wing flow path 63. One of the connection flow paths 67A, 67B near both ends of the molded object W is connected to the end of the internal flow path 65. The other connection flow path 67C near one end of the molded object W has a supply port 69A at its end, and the other connection flow path 67D near the other end of the molded object W has a discharge port 69B at its end.

In the cooling flow passage 61, the cooling medium is fed from the supply port 69A and discharged from the discharge port 69B. Specifically, the cooling medium fed from the supply port 69A is fed to one of the wing passages 63 through the connecting passage 67C and flows inside the wing passage 63. The cooling medium is further fed to the internal passage 65 through the connecting passage 67B and flows inside the internal passage 65. The cooling medium is then fed to the other wing passage 63 through the connecting passage 67A and flows through the wing passage 63. The cooling medium is then sent to the connecting passage 67D and discharged from the discharge port 69B. As a result, the model W has each blade 55 cooled by the cooling medium flowing through the wing passage 63, and the inside of the center side cooled by the cooling medium flowing through the internal passage 65.

Fig. 3 is a cross-sectional view taken along line II in Fig. 1. Fig. 4 is a cross-sectional view taken along line II-II in Fig. 1.
As shown in FIG. 3, the blade flow passage 63 is formed with a trapezoidal cross section 63A that is trapezoidal in axial cross section in the region at both ends in the axial direction. Also, as shown in FIG. 4, the blade flow passage 63 is formed with a curved cross section 63B that is curved, such as a bow shape or an arch shape, in the region at the center in the axial direction. In the blade flow passage 63, the shape in axial cross section is gradually changed from the trapezoidal cross section 63A at both ends in the axial direction to the curved cross section 63B at the center in the axial direction. The blade flow passage 63, in which the regions at both ends in the axial direction are the trapezoidal cross section 63A formed in a trapezoidal shape and the region at the center in the axial direction are the curved cross section 63B formed in a curved shape, has the same cross-sectional area at any position. In other words, the blade flow passage 63 maintains the same cross-sectional area at any axial position, while the cross-sectional shape is gradually changed from a trapezoidal cross section to a curved cross section from both ends in the axial direction to the center. That is, in Fig. 3, the surface of the blade flow passage 63 along the outer surface of the blade is trapezoidal and parallel to the outer surface of the blade. This makes it possible to make the thickness from the outer surface of the blade to the blade flow passage 63 uniform, and the blade can be cooled evenly. Also, in Fig. 4, the surface of the blade flow passage 63 along the outer surface of the blade has a surface parallel to the outer surface of the blade. Even in this case, it is possible to make the thickness from the outer surface of the blade to the blade flow passage 63 nearly uniform, and the blade can be cooled evenly.

Next, we will explain the manufacturing system for manufacturing the above-mentioned object W. Figure 5 is a schematic diagram of the manufacturing system 100 for manufacturing the object W.

As shown in FIG. 5, the manufacturing system 100 of this configuration includes an additive manufacturing device 11, a cutting device 12, a controller 13 that controls the additive manufacturing device 11 and the cutting device 12, and a power supply device 15.

The additive manufacturing device 11 has a welding robot 19 with a torch 17 on its tip shaft, and a filler material supply unit 21 that supplies filler material (welding wire) M to the torch 17. The torch 17 holds the filler material M protruding from its tip.

The welding robot 19 is an articulated robot, and the torch 17 attached to the tip shaft is supported so that the filler metal M can be continuously supplied. The position and posture of the torch 17 can be set arbitrarily in three dimensions within the range of the degrees of freedom of the robot arm.

The torch 17 has a shield nozzle (not shown) through which shielding gas is supplied. The arc welding method used in this configuration may be either a consumable electrode type such as shielded metal arc welding or carbon dioxide gas arc welding, or a non-consumable electrode type such as TIG welding or plasma arc welding, and is selected appropriately depending on the object W to be produced.

For example, in the case of a consumable electrode type, a contact tip is placed inside the shield nozzle, and the filler material M to which a melting current is supplied is held by the contact tip. While holding the filler material M, the torch 17 generates an arc from the tip of the filler material M in a shielding gas atmosphere. The filler material M is fed from the filler material supply section 21 to the torch 17 by a payout mechanism (not shown) attached to a robot arm or the like. Then, as the torch 17 moves, the continuously fed filler material M is melted and solidified, forming a linear weld bead that is the molten solidified body of the filler material M.

The heat source for melting the filler material M is not limited to the arc described above. For example, other heat sources may be used, such as a heating method that combines an arc and a laser, a heating method that uses plasma, or a heating method that uses an electron beam or laser. When heating with an electron beam or laser, the amount of heat can be controlled more precisely, and the state of the weld bead can be more appropriately maintained, contributing to further improving the quality of the molded object W.

Any commercially available welding wire can be used as the filler material M. For example, wires specified in MAG and MIG welding solid wires for mild steel, high tensile steel and low temperature steel (JIS Z 3312), arc welding flux-cored wires for mild steel, high tensile steel and low temperature steel (JIS Z 3313), etc. can be used.

The cutting device 12 is equipped with a cutting robot 41. The cutting robot 41 is an articulated robot, similar to the welding robot 19, and is equipped with a metal processing tool 45, such as an end mill or a grinding wheel, at the tip of the distal arm 43. This allows the cutting robot 41 to move three-dimensionally by the controller 13 so that its processing posture can be any posture.

The cutting robot 41 cuts and processes the shaft body 51 or the shaped portion 53 formed on the shaft body 51 using a metal processing tool 45.

The controller 13 has a CAD/CAM unit 31, a trajectory calculation unit 33, a memory unit 35, and a control unit 37 to which these are connected.

The CAD/CAM unit 31 creates shape data for the object W to be manufactured, then divides it into multiple layers and generates layer shape data representing the shape of each layer. The trajectory calculation unit 33 calculates the movement trajectory of the torch 17 based on the generated layer shape data. The trajectory calculation unit 33 also calculates the movement trajectory of the metal processing tool 45 based on the shape data. The memory unit 35 stores data such as the shape data of the object W, the generated layer shape data, the movement trajectory of the torch 17, and the movement trajectory of the metal processing tool 45.

The control unit 37 executes a drive program based on the layer shape data stored in the memory unit 35 and the movement trajectory of the torch 17 to drive the welding robot 19. That is, the welding robot 19 moves the torch 17 while melting the filler material M with an arc, based on the movement trajectory of the torch 17 generated by the trajectory calculation unit 33, in response to a command from the controller 13. The control unit 37 also executes a drive program based on the shape data stored in the memory unit 35 or the movement trajectory of the metal processing tool 45 to drive the cutting robot 41. As a result, cutting is performed on the shaft 51 or the shaped portion 53 by the metal processing tool 45 provided on the tip arm 43 of the cutting robot 41.

The manufacturing system 100 configured as described above moves the torch 17 by driving the welding robot 19 along the movement trajectory of the torch 17 generated from the set layer shape data, and while rotating the shaft body 51 around its axis, the torch 17 deposits a weld bead made of molten filler material M around the shaft body 51. This produces a molded object W in which a molded portion 53 made of a weld bead is formed on the outer periphery of the shaft body 51. This molded object W is cut by the metal processing tool 45 of the cutting device 12 to be formed into a designed outer shape. Both ends of the shaft body 51 are supported by supports 49 provided on the base 47 to enable it to rotate.

Next, a method for producing a shaped object according to the present invention will be described.
6 to 8 are schematic side views taken along the axial direction of the object W during its production, illustrating the manufacturing process of the object W. In FIG.

(Internal flow path forming process)
As shown in Fig. 6, the outer periphery of the shaft body 51 is cut to form a groove 59. Specifically, while rotating the shaft body 51, both ends of which are supported by the supports 49, the outer periphery of the shaft body 51 is cut by the metal processing tool 45 of the cutting device 12. At this time, the metal processing tool 45 is moved from one end side to the other end side of the shaft body 51. As a result, a spiral groove 59 is formed on the outer periphery of the shaft body 51 along the axial direction.

As shown in FIG. 7, while rotating the shaft body 51, a weld bead is formed and layered around the shaft body 51 in the circumferential direction by the torch 17. This forms the inner peripheral portion of the shaped portion 53 consisting of the layered weld beads on the outer periphery of the shaft body 51. Note that when forming the shaped portion 53 around the shaft body 51, a weld bead is formed along the edge of the groove portion 59 in the shaft body 51 in advance to seal the groove portion 59. In this way, by sealing the groove portion 59 with a weld bead and forming the inner peripheral portion of the shaped portion 53 on the outer periphery of the shaft body 51, a spiral internal flow path 65 along the axial direction is formed.

(Wing section molding process)
8 , after the inner peripheral portion of the shaping portion 53 is shaped, the outer peripheral portion of the shaping portion 53 having the blade 55 is shaped. Specifically, weld beads are repeatedly formed along the extension direction of the blade 55 to be shaped. In this way, the shaping portion 53 having the blade 55 is shaped on the outer periphery of the shaft body 51.

At this time, when forming the blade 55, a wing passage forming process is performed in which a hollow portion is formed by leaving gaps between the weld beads, thereby forming a wing passage 63 surrounded by the weld beads in the axial cross-sectional view along the extension direction of the weld beads.

In addition, a connection flow passage forming process is performed to form a connection flow passage 67 extending in the radial direction at both ends of the shaping portion 53. This connection flow passage 67 can be formed by forming a weld bead while avoiding the portion that will become the connection flow passage 67. Note that the connection flow passage 67 may also be formed by machining after laminating the weld beads.

Next, an example of a blade passage forming step for forming the blade passage 63 in the blade 55 will be described.
(Formation of trapezoidal cross-sectional portion 63A)
9 and 10 are diagrams for explaining the blade passage forming step of forming the trapezoidal cross-sectional portion 63A of the blade passage 63, and in FIG. 9, the weld bead B is indicated by hatching.

As shown in FIG. 9A and FIG. 10A, the weld bead B is formed along the extension direction X of the blade 55 on the base layer BLU consisting of the weld bead B, and the weld bead layer BL1 is laminated. At this time, a gap GA1 is formed between the weld beads B.

As shown in FIG. 9B and FIG. 10B, a weld bead B is formed along the extension direction X of the blade 55 on the lower weld bead layer BL1, and the weld bead layer BL2 is laminated. At this time, a gap GA2 smaller than the gap GA1 formed in the lower weld bead layer BL1 is formed between the weld beads B.

As shown in FIG. 9C and FIG. 10C, a weld bead B is formed on the lower weld bead layer BL2 along the extension direction X of the blade 55, and a weld bead layer BL3 is laminated so as to close the gap GA2 formed in the lower weld bead layer BL2.

As described above, by stacking the weld bead layers BL1, BL2, and BL3 in order on the base layer BLU, the blade 55 is formed while forming the blade flow passage 63 consisting of a hollow portion with a trapezoidal cross section 63A that is trapezoidal in axial cross section.

(Formation of curved cross-sectional portion 63B)
11 and 12 are diagrams for explaining the blade passage forming step for forming the curved cross-sectional portion 63B of the blade passage 63, and in FIG. 11, the weld bead B is indicated by hatching.

As shown in FIG. 11A and FIG. 12A, the weld beads B are formed along the extension direction X of the blade 55 on the base layer BLU made of the weld beads B, and the weld bead layer BL1 is laminated. At this time, two gaps GB1 are formed between the weld beads B with a space between them.

As shown in FIG. 11B and FIG. 12B, a weld bead B is formed along the extension direction X of the blade 55 on the lower weld bead layer BL1, and the weld bead layer BL2 is laminated. At this time, a gap GB2 is formed between the weld beads B, which is connected to the two gaps GB1 formed in the lower weld bead layer BL1.

As shown in FIG. 11C and FIG. 12C, a weld bead B is formed on the lower weld bead layer BL2 along the extension direction X of the blade 55, and a weld bead layer BL3 is laminated so as to close the gap GB2 formed in the lower weld bead layer BL2.

As described above, by stacking the weld bead layers BL1, BL2, and BL3 in order on the base layer BLU, the blade 55 is formed while forming the blade flow passage 63 consisting of a hollow portion with a curved cross-sectional portion 63B that is curved in axial cross section.

As described above, according to this embodiment, when the weld beads B are stacked to form the blade 55, gaps are provided between the weld beads B to form hollow portions, so that the blade flow passage 63 surrounded by the weld beads B in the axial cross-sectional view can be formed along the extension direction of the weld beads B. This makes it possible to easily and at low cost manufacture the molded object W that can efficiently cool the blade 55, compared to casting using a core.

In addition, in the wing passage forming process, by narrowing the gaps GA1, GA2 in the laminated weld bead layers BL1, BL2 from the lower layer to the upper layer, it is possible to easily form the wing passage 63 with a trapezoidal cross section 63A in an axial cross section, which ensures a large cross-sectional area with a small number of passes.

Furthermore, in the blade passage forming process, two gaps GB1 are formed in the lower weld bead layer BL1, and one gap GB2 is formed in the upper weld bead layer BL2 that connects to the two lower gaps GB1, making it easy to form the blade passage 63 with a curved cross-sectional portion 63B that is curved in axial cross section and capable of flowing the cooling medium over a wide area.

In addition, the blade passage 63 is formed so that the surface along the outer surface of the blade 55 is parallel to the outer surface of the blade 55, so the thickness from the outer surface of the blade 55 to the blade passage 63 can be made uniform, allowing the blade 55 to be cooled evenly.

Furthermore, by forming an internal flow passage 65 on the outer periphery of the shaft body 51, a molded object W that can be cooled efficiently over a wider area can be manufactured easily and at low cost.

In addition, by forming a connecting flow path 67 that connects the internal flow path 65 and the wing flow path 63, the cooling medium can be circulated between the internal flow path 65 and the wing flow path 63 via the connecting flow path 67. This allows the inside of the molded object W and the blade 55 to be cooled efficiently and uniformly. In addition, by circulating the cooling medium between the wing flow path 63 and the internal flow path 65, it is possible to easily determine whether or not there is a blockage in the cooling flow path 61.

In the above embodiment, the wing flow passage 63 is formed with trapezoidal cross-sectional portions 63A at both ends and a curved cross-sectional portion 63B at the center, but the wing flow passage 63 may have a trapezoidal cross-sectional portion 63A or a curved cross-sectional portion 63B over its entire length.

As such, the present invention is not limited to the above-described embodiments, and the invention also contemplates combinations of the various components of the embodiments, as well as modifications and applications by those skilled in the art based on the descriptions in the specification and well-known technologies, and these are included in the scope of the protection sought.

As described above, the present specification discloses the following:
(1) A method for manufacturing a shaped object including a shaped portion having a wing portion formed by laminating a weld bead formed by melting and solidifying a filler metal on an outer periphery of a rod-shaped shaft, the method comprising the steps of:
When forming the shaping portion, a wing portion forming step is performed in which the weld bead is formed along the extension direction of the wing portion to form the wing portion,
In the wing portion forming process,
A method for manufacturing a shaped object, comprising: a wing passage forming process for forming a hollow portion by leaving a gap between the weld beads when stacking the weld beads, thereby forming a wing passage surrounded by the weld beads in an axial cross-sectional view along the extension direction of the weld beads.
According to this manufacturing method of a molded object, when the weld beads are stacked to form the airfoil, gaps are provided between the weld beads to form hollow portions, so that the airfoil flow passage surrounded by the weld beads in the axial cross-sectional view can be formed along the extension direction of the weld beads. This makes it possible to easily and inexpensively manufacture a molded object that allows the airfoil to be cooled efficiently, compared to casting using a core.

(2) The method for manufacturing a shaped object described in (1), wherein, when forming at least a portion of the wing passage in the wing passage forming process, the gap in a weld bead layer consisting of a plurality of the weld beads is narrowed from a lower layer toward an upper layer to form the wing passage having a trapezoidal shape in an axial cross-sectional view.
According to this method for manufacturing a molded object, by narrowing the gaps in the stacked weld bead layers from the lower layer to the upper layer, it is possible to easily form a blade section flow path that is trapezoidal in axial cross-section, which allows for a large cross-sectional area to be secured with a small number of passes.

(3) The method for manufacturing a shaped object according to (1) or (2), wherein when forming at least a part of the wing passage in the wing passage forming step, two gaps are formed on a lower layer side in a weld bead layer made up of a plurality of the weld beads, and one gap connected to the two gaps in the lower layer is formed on an upper layer side, thereby forming the wing passage that is curved in an axial cross-sectional view.
According to this method of manufacturing a molded object, by forming two gaps in the lower weld bead layer and forming one gap in the upper weld bead layer that connects to the two gaps in the lower layer, it is possible to easily form a blade section flow passage that is curved in axial cross-section and capable of flowing cooling medium over a wide area.

(4) In the blade passage forming step,
The method for manufacturing a molded object described in any one of (1) to (3), wherein a gap in the weld bead is formed so that a surface along an outer surface of the wing portion in the wing portion flow path is parallel to the outer surface of the wing portion.
According to this method for manufacturing a molded object, a blade flow passage is formed such that the surface that follows the outer surface of the blade is parallel to the outer surface of the blade, so that the thickness from the outer surface of the blade to the blade flow passage can be made uniform, and the blade can be cooled evenly.

(5) A method for manufacturing a shaped object according to any one of (1) to (4), comprising an internal flow path forming step of forming a groove on an outer periphery of the shaft body, and stacking the weld bead on the outer periphery of the shaft body so as to close an opening of the groove, thereby forming an internal flow path.
According to this method for manufacturing a molded object, by forming an internal flow passage around the outer periphery of the shaft, a molded object that can efficiently cool a wider area can be manufactured easily and at low cost.

(6) The method for manufacturing a shaped object according to (5), further comprising the step of forming a connecting passage that connects the internal passage and the blade passage when forming the shaped portion.
According to this manufacturing method of a molded object, by forming a connecting flow path that connects the internal flow path and the blade flow path, it is possible to circulate the cooling medium between the internal flow path and the blade flow path via the connecting flow path. This makes it possible to efficiently and uniformly cool the inside of the molded object and the blade. In addition, by circulating the cooling medium between the blade flow path and the internal flow path, it is possible to easily determine whether or not there is a blockage in the flow path.

(7) A rod-shaped shaft body;
a shaped portion provided on an outer periphery of the shaft body and having wings shaped by laminating welding beads formed by melting and solidifying a filler metal;
a wing passage formed along the wing in the shaping portion;
an internal flow passage formed around the shaft;
A sculpture having the above structure.
This object has a blade passage formed along the blade and an internal passage formed around the shaft, and by passing a cooling medium through the blade passage and the internal passage, it is possible to efficiently cool a wide area including the blade.

(8) The shaped object according to (7), further comprising a connecting passage that communicates with the internal passage and the blade passage.
In this molded object, the internal flow path and the blade flow path are connected by a connecting flow path, so that the cooling medium can be circulated between the internal flow path and the blade flow path via the connecting flow path. This allows the inside of the molded object and the blade to be cooled efficiently and uniformly. In addition, by circulating the cooling medium between the blade flow path and the internal flow path, it is possible to easily determine whether or not there is a blockage in the flow path.

(9) At least a portion of the blade flow passage is
It is formed in a trapezoidal shape when viewed in axial cross section,
The object according to (7) or (8), wherein a surface along the outer surface of the wing portion is parallel to the outer surface of the wing portion.
According to this molded product, the blade passage is trapezoidal in axial cross section, allowing the coolant to flow smoothly. Also, the surface of the trapezoidal blade passage that follows the outer surface of the blade is parallel to the outer surface of the blade, making the thickness from the outer surface of the blade passage to the blade passage uniform, allowing the blade to be cooled evenly.

(10) At least a portion of the blade flow passage is
It is formed in a curved shape when viewed in axial cross section,
The object according to any one of (7) to (9), wherein the surface along the outer surface of the wing portion has a surface parallel to the outer surface of the wing portion.
According to this molded product, the blade passage is curved in the axial cross section, so that the cooling medium can flow over a wide area in the axial cross section. Also, since the surface of the curved blade passage along the outer surface of the blade is parallel to the outer surface of the blade, the thickness from the outer surface of the blade to the blade passage can be made uniform, so that the blade can be cooled evenly.

51 Shaft body 53 Forming portion 55 Blade (wing portion)
59 Groove 63 Blade flow passage 65 Internal flow passage 67, 67A to 67D Connection flow passage B Weld bead BL1, BL2, BL3 Weld bead layer GA1, GA2, GB1, GB2 Gap M Filler metal W Molded object X Extension direction

Claims (10)

A method for manufacturing a shaped object comprising the steps of: manufacturing a shaped object having a shaped portion having a wing portion formed by laminating a welding bead formed by melting and solidifying a filler metal on an outer periphery of a rod-shaped shaft body, the method comprising the steps of:
When forming the shaping portion, a wing portion forming step is performed in which the weld bead is formed along the extension direction of the wing portion to form the wing portion,
In the wing portion forming process,
a blade flow passage forming step is performed in which, when the weld beads are laminated, gaps are provided between the weld beads to form hollow portions, thereby forming blade flow passages surrounded by the weld beads in an axial cross-sectional view along an extension direction of the weld beads.
A method for manufacturing a sculpture. When forming at least a part of the blade passage in the blade passage forming step,
the gap in a weld bead layer formed of a plurality of the weld beads is narrowed from a lower layer toward an upper layer, thereby forming the blade portion flow passage having a trapezoidal shape in an axial cross-sectional view.
The method for producing a shaped object according to claim 1 . When forming at least a part of the blade passage in the blade passage forming step,
In a weld bead layer made up of a plurality of the weld beads, two of the gaps are formed on a lower layer side, and one gap connected to the two gaps of the lower layer is formed on an upper layer side, thereby forming the blade portion flow path having a curved shape in an axial cross-sectional view.
The method for producing a shaped object according to claim 1 or 2. In the blade flow passage forming step,
forming a gap in the weld bead so that a surface of the blade flow passage along the outer surface of the blade is parallel to the outer surface of the blade;
The method for producing a shaped object according to any one of claims 1 to 3. an internal flow passage forming step of forming a groove on an outer periphery of the shaft body, and laminating the weld bead on the outer periphery of the shaft body so as to close an opening of the groove, thereby forming an internal flow passage;
The method for producing a shaped object according to any one of claims 1 to 4. When forming the shaping portion, a connecting flow passage forming step is performed to form a connecting flow passage that connects the internal flow passage and the blade portion flow passage.
The method for producing a shaped object according to claim 5 . A rod-shaped shaft body,
a shaped portion provided on an outer periphery of the shaft body and having wings shaped by laminating welding beads formed by melting and solidifying a filler metal;
a wing passage formed along the wing in the shaping portion;
an internal flow passage formed around the shaft;
having
A sculpture. a connecting passage communicating with the internal passage and the blade passage;
The shaped object according to claim 7. At least a portion of the blade passage is
It is formed in a trapezoidal shape when viewed in axial cross section,
A surface along the outer surface of the wing portion is parallel to the outer surface of the wing portion.
The shaped object according to claim 7 or 8. At least a portion of the blade passage is
It is formed in a curved shape when viewed in axial cross section,
The surface along the outer surface of the wing portion has a surface parallel to the outer surface of the wing portion.
The shaped article according to any one of claims 7 to 9.

Images