WO2022131037A1

WO2022131037A1 - Molded object manufacturing method and molded object

Info

Publication number: WO2022131037A1
Application number: PCT/JP2021/044591
Authority: WO
Inventors: 貴宏篠崎
Original assignee: 株式会社神戸製鋼所
Priority date: 2020-12-16
Filing date: 2021-12-03
Publication date: 2022-06-23

Abstract

Provided is a molded object manufacturing method for manufacturing a molded object provided with a molded section having a blade that is molded by layering weld beads obtained by melting and solidifying a filler metal on the outer periphery of a rod-form shaft body, wherein: the method involves performing a wing part molding step in which, during molding of the molded section, the weld beads are formed along the extension direction of the blade to mold the blade; and in the wing part molding step, there is performed a wing part flow path formation step in which, during layering of the weld beads, a gap is opened between the weld beads to form a hollow portion, whereby a wing part flow path bounded by the weld beads in an axial cross-sectional view is formed along the extension direction of the weld beads.

Description

Manufacturing method of modeled object and modeled object

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

In recent years, the need for 3D printers as a means of production has been increasing, and research and development is being carried out for practical use in the aircraft industry, etc., especially for application to metal materials. A 3D printer using a metal material melts a metal powder or a metal wire by using a heat source such as a laser or an arc, and laminates the molten metal to form a modeled object.

For example, as a technique for manufacturing a rotating body having a blade, there is a technique for forming a blade by laminating a welded bead around a shaft body as a central axis (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2019-155463

By the way, by forming an internal flow path along the surface of the wing portion on the blade (wing portion) of the rotating body as described above and flowing a cooling medium through the internal flow path, the cooling performance of the wing portion is improved. May be planned. The formation of the internal flow path can be easily performed by machining such as cutting if the internal flow path has a simple shape, but it is difficult to form the internal flow path by machining when the internal flow path has a complicated shape. Further, it is conceivable to form the internal flow path by casting, but in that case, a dedicated core must be used, which increases the manufacturing cost. Moreover, in casting using a core, the manufacturing process is complicated and it is difficult to remove the core after molding.

The present invention has been made in view of the above circumstances, and an object thereof is a method for manufacturing a modeled object and a modeled object capable of easily and at low cost to manufacture a modeled object having a flow path along a wing portion. It is to provide things.

The present invention has the following configuration.
(1) A method for manufacturing a shaped object having a shaped portion having a wing portion formed by laminating a welded bead obtained by laminating and solidifying a filler metal on the outer periphery of a rod-shaped shaft body. ,
When modeling the shaped portion, a wing portion forming step of forming the welded bead along the extending direction of the wing portion to form the wing portion is performed, and the wing portion forming step is performed.
In the wing shaping process,
When the welded beads are laminated, a hollow portion is formed by leaving a gap between the welded beads so that the wing flow path surrounded by the welded beads can be formed along the extending direction of the welded beads in the axial cross-sectional view. Perform the wing flow path forming process to be formed.
Manufacturing method of the modeled object.
(2) A rod-shaped shaft and
A molding portion provided on the outer periphery of the shaft body and having a wing portion formed by laminating welded beads obtained by melting and solidifying a filler metal, and a molding portion.
A wing flow path formed along the wing in the modeling portion,
The internal flow path formed around the shaft body and
Have,
Modeled object.

According to the present invention, a modeled object having a flow path along a wing portion can be easily manufactured at low cost.

It is a perspective view of the modeled object manufactured by the manufacturing method of this invention. It is a perspective view of the cooling flow path formed inside the modeled object. FIG. 3 is a cross-sectional view taken along the line I-I in FIG. It is sectional drawing along the line II-II in FIG. It is a schematic schematic block diagram of the manufacturing system for manufacturing a modeled object. It is a schematic side view along the axial direction of the modeled product in the middle of manufacturing which explains the manufacturing process of the modeled object. It is a schematic side view along the axial direction of the modeled product in the middle of manufacturing which explains the manufacturing process of the modeled object. It is a schematic side view along the axial direction of the modeled product in the middle of manufacturing which explains the manufacturing process of the modeled object. It is a figure explaining the process of forming a trapezoidal cross section of a wing flow path, and (A) to (C) are schematic plan views of each modeling part. It is a figure explaining the process of forming a trapezoidal cross section of a wing flow path, and (A) to (C) are schematic cross-sectional views of each modeling part. It is a figure explaining the process of forming a wing flow path for forming a curved cross section of a wing flow path, and FIGS. (A) to (C) are schematic plan views of each of the shaped parts. It is a figure explaining the process of forming a curved cross section of a wing channel, and FIGS. (A) to (C) are schematic cross-sectional views of each of the shaped portions.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a modeled object W manufactured by the manufacturing method of the present invention. FIG. 2 is a perspective view of the cooling flow path 61 formed inside the modeled object W.

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

The shaft body 51 is, for example, a round bar body having a circular cross section such as a steel bar. The blade 55 of the modeling portion 53 provided on the outer periphery of the shaft body 51 is formed in a shape in which a protruding portion toward the outer periphery is spirally twisted in the axial direction. The modeling portion 53 having the blade 55 is formed by forming a welded bead around the shaft body 51 and laminating it. The surface of the modeling portion 53 formed by the welding bead is then machined by cutting to form a target shape.

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

The cooling flow path 61 has a pair of blade flow paths 63, an internal flow path 65, and a plurality of connection flow paths 67.

The blade flow path 63 is provided inside each blade 55 and extends along the blade 55. Each wing flow path 63 is provided at a position symmetrical with respect to each other with the axis of the model W as the center. These wing portion flow paths 63 are formed in the modeling portion 53 in the modeling object W.

The internal flow path 65 is provided on the center side of the blade flow path 63 in the model W, and is formed in a spiral shape in the axial direction. The internal flow path 65 is formed on the outer peripheral portion of the shaft body 51.

A pair of connection flow paths 67 are formed near both ends of the modeled object W, and each is formed along the radial direction. Each connecting flow path 67 communicates with the end of the wing flow path 63. One of the connecting flow paths 67A and 67B near both ends of the modeled object W is communicated with the end of the internal flow path 65, respectively. The other connection flow path 67C near one end of the model W is provided with a supply port 69A at its end, and the other connection flow path 67D near the other end of the model W is provided with a discharge port at its end. 69B is provided.

In the cooling flow path 61, a cooling medium is sent from the supply port 69A, and this cooling medium is discharged from the discharge port 69B. Specifically, the cooling medium supplied from the supply port 69A is sent to one wing flow path 63 through the connection flow path 67C and flows in the wing flow path 63. Further, the cooling medium is sent to the internal flow path 65 through the connection flow path 67B and flows in the internal flow path 65. After that, the cooling medium is sent to the other blade flow path 63 through the connection flow path 67A and flows through the blade flow path 63. Then, the cooling medium is sent out to the connection flow path 67D and discharged from the discharge port 69B. As a result, in the modeled object W, each blade 55 is cooled by the cooling medium flowing through the blade flow path 63, and the inside of the center side is cooled by the cooling medium flowing through the internal flow path 65.

FIG. 3 is a cross-sectional view taken along the line I-I in FIG. FIG. 4 is a cross-sectional view taken along the line II-II in FIG.
As shown in FIG. 3, the blade flow path 63 is formed as a trapezoidal trapezoidal cross-sectional portion 63A in the axial cross-sectional view in the regions on both ends in the axial direction. Further, as shown in FIG. 4, in the wing flow path 63, the region on the central side in the axial direction is formed as a curved cross-sectional portion 63B having a curved shape such as a bow shape or an arch shape in the axial cross-sectional view. There is. In the blade flow path 63, the shape in the axial cross-sectional view is gradually changed from the trapezoidal cross-sectional portion 63A on both ends in the axial direction to the curved cross-sectional portion 63B on the central side in the axial direction. The area on both ends in the axial direction is a trapezoidal cross-sectional portion 63A formed in a trapezoidal shape, and the region on the central side in the axial direction is a curved cross-sectional portion 63B formed in a curved shape. Has the same cross-sectional area at all positions. That is, the cross-sectional shape of the blade flow path 63 is gradually changed from trapezoidal to curved from both ends in the axial direction to the center while maintaining the same cross-sectional area at any axial position. .. That is, in FIG. 3, the surface of the blade flow path 63 along the outer surface of the blade has a trapezoidal shape parallel to the outer surface of the blade. As a result, the wall thickness from the outer surface of the wing portion to the wing portion flow path 63 can be made uniform, and the wing portion can be cooled evenly. Further, in FIG. 4, the surface of the blade flow path 63 along the outer surface of the blade has a surface parallel to the outer surface of the blade. Even in this case, the wall thickness from the outer surface of the wing portion to the wing portion flow path 63 can be made uniform, and the wing portion can be cooled evenly.

Next, the manufacturing system for manufacturing the above-mentioned model W will be described. FIG. 5 is a schematic schematic configuration diagram of a manufacturing system 100 for manufacturing a model W.

As shown in FIG. 5, the manufacturing system 100 having this configuration includes a laminated modeling device 11, a cutting device 12, a controller 13 that comprehensively controls the laminated modeling device 11 and the cutting device 12, and a power supply device 15.

The laminated modeling device 11 has a welding robot 19 having a torch 17 on the tip shaft, and a filler material supply unit 21 that supplies the filler material (welding wire) M to the torch 17. The torch 17 holds the filler metal M in a state of protruding from the tip.

The welding robot 19 is an articulated robot, and the torch 17 provided on 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 arbitrarily set three-dimensionally within the range of the degree of freedom of the robot arm.

The torch 17 has a shield nozzle (not shown), and shield gas is supplied from the shield nozzle. The arc welding method used in this configuration may be either a consumable electrode type such as shielded metal arc welding or carbon dioxide arc welding, or a non-consumable electrode type such as TIG welding or plasma arc welding. It will be selected as appropriate.

For example, in the case of the consumable electrode type, a contact tip is arranged inside the shield nozzle, and the filler metal M to which the melting current is supplied is held by the contact tip. The torch 17 generates an arc from the tip of the filler M in a shield gas atmosphere while holding the filler M. The filler material M is fed from the filler material supply unit 21 to the torch 17 by a feeding mechanism (not shown) attached to a robot arm or the like. Then, when the filler metal M that is continuously fed is melted and solidified while moving the torch 17, a linear welded bead that is a melt-solidified body of the filler metal M is formed.

The heat source for melting the filler metal M is not limited to the above-mentioned arc. For example, a heat source by another method such as a heating method using a combination of an arc and a laser, a heating method using plasma, a heating method using an electron beam or a laser may be adopted. When heating by an electron beam or a laser, the amount of heating can be controlled more finely, the state of the welded bead can be maintained more appropriately, and the quality of the model W can be further improved.

As the filler material M, any commercially available welding wire can be used. For example, it is defined by MAG welding and MIG welding solid wire (JIS Z 3312) for mild steel, high tension steel and low temperature steel, arc welding flux containing wire for mild steel, high tension steel and low temperature steel (JIS Z 3313), etc. Wire can be used.

The cutting device 12 includes a cutting robot 41. The cutting robot 41 is an articulated robot like the welding robot 19, and is provided with a metal processing tool 45 such as an end mill or a grinding wheel at the tip of the tip arm 43. As a result, the cutting robot 41 can be moved three-dimensionally by the controller 13 so that the machining posture can take an arbitrary posture.

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

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

The CAD / CAM unit 31 creates shape data of the model W to be manufactured, and then divides the data into a plurality of layers to generate layer shape data representing the shape of each layer. The trajectory calculation unit 33 obtains the movement trajectory of the torch 17 based on the generated layer shape data. Further, the trajectory calculation unit 33 obtains the movement trajectory of the metal processing tool 45 based on the shape data. The storage unit 35 stores data such as the shape data of the modeled object W, the generated layer shape data, the movement locus of the torch 17, and the movement locus of the metal processing tool 45.

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

The manufacturing system 100 having the above configuration moves the torch 17 by driving the welding robot 19 and rotates the shaft body 51 around the axis along the movement locus of the torch 17 generated from the set layer shape data. However, the welded bead made of the molten filler M is laminated around the shaft body 51 by the torch 17. As a result, a modeled object W in which a modeled portion 53 made of a welded bead is formed on the outer periphery of the shaft body 51 is manufactured. The modeled object W is formed into a designed outer shape by cutting with the metal processing tool 45 of the cutting device 12. Both ends of the shaft body 51 are supported by a support portion 49 provided on the base 47 and are rotatable.

Next, a method for manufacturing the modeled object of the present invention will be described.
6 to 8 are schematic side views along the axial direction of the model W in the middle of manufacturing for explaining the manufacturing process of the model W.

(Internal flow path forming process)
As shown in FIG. 6, the outer periphery of the shaft body 51 is cut to form the groove portion 59. Specifically, the outer peripheral surface of the shaft body 51 is cut by the metal processing tool 45 of the cutting device 12 while rotating the shaft body 51 having both ends supported by the support portion 49. 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 portion 59 along the axial direction is formed on the outer periphery of the shaft body 51.

As shown in FIG. 7, while rotating the shaft body 51, a welded bead is formed around the shaft body 51 by a torch 17 along the circumferential direction and laminated. As a result, the inner peripheral portion of the modeling portion 53 made of the laminated welded beads is formed on the outer periphery of the shaft body 51. When forming the modeling portion 53 around the shaft body 51, a welding bead is formed in advance along the edge portion of the groove portion 59 in the shaft body 51 to seal the groove portion 59. In this way, by sealing the groove portion 59 with a welding bead and forming the inner peripheral portion of the modeling portion 53 on the outer periphery of the shaft body 51, a spiral internal flow path 65 along the axial direction is formed.

(Wing part modeling process)
As shown in FIG. 8, after modeling the inner peripheral portion of the modeling portion 53, the outer peripheral portion of the modeling portion 53 having the blade 55 is modeled. Specifically, a welded bead is repeatedly formed along the extending direction of the blade 55 to be formed. As a result, a modeling portion 53 having a blade 55 is formed on the outer periphery of the shaft body 51.

At this time, when the blade 55 is formed, a hollow portion is formed by leaving a gap between the welded beads so that the blade passage 63 surrounded by the welded beads can be formed along the extending direction of the welded beads in the axial cross-sectional view. The wing flow path forming step is performed.

Further, a connection flow path forming step of forming a connection flow path 67 extending in the radial direction is performed at both ends of the modeling portion 53. The connection flow path 67 can be formed by forming a welded bead while avoiding the portion that becomes the connection flow path 67. The connection flow path 67 may be formed by machining after laminating the welded beads.

Next, an example of the blade flow path forming step of forming the blade flow path 63 on the blade 55 will be described.
(Formation of trapezoidal cross section 63A)
9 and 10 are views for explaining the wing flow path forming process for forming the trapezoidal cross-sectional portion 63A of the wing flow path 63, and in FIG. 9, the welded bead B is shown in a shaded area.

As shown in (A) of FIG. 9 and (A) of FIG. 10, the welded bead B is formed along the extending direction X of the blade 55 with respect to the base layer BLU made of the welded bead B to form the welded bead layer. BL1 is laminated. At this time, a gap GA1 is formed between the welded beads B.

As shown in (B) of FIG. 9 and (B) of FIG. 10, the welded bead B is formed along the extending direction X of the blade 55 with respect to the welded bead layer BL1 of the lower layer to form the welded bead layer BL2. Laminate. At this time, a gap GA2 smaller than the gap GA1 formed by the lower weld bead layer BL1 is formed between the welded beads B.

As shown in (C) of FIG. 9 and (C) of FIG. 10, a welded bead B is formed along the extending direction X of the blade 55 with respect to the welded bead layer BL2 of the lower layer, and the welded bead layer of the lower layer is formed. The welded bead layer BL3 is laminated so as to close the gap GA2 formed in BL2.

As described above, by laminating the welded bead layers BL1, BL2, and BL3 in order on the base layer BLU, the blade 55 is formed, and the inside thereof is a trapezoidal cross-sectional portion 63A having a trapezoidal cross-sectional view. A wing flow path 63 composed of a hollow portion can be formed.

(Formation of curved cross section 63B)
11 and 12 are views for explaining a wing flow path forming step for forming a curved cross-sectional portion 63B of the wing flow path 63, and in FIG. 11, the welded bead B is shown in a shaded area. ..

As shown in (A) of FIG. 11 and (A) of FIG. 12, the welded bead B is formed along the extending direction X of the blade 55 with respect to the base layer BLU made of the welded bead B, and the welded bead layer is formed. BL1 is laminated. At this time, two gaps GB1 are formed at intervals between the welded beads B.

As shown in (B) of FIG. 11 and (B) of FIG. 12, the welded bead B is formed with respect to the lower welded bead layer BL1 along the extending direction X of the blade 55 to form the welded bead layer BL2. Laminate. At this time, one gap GB2 connected to the two gaps GB1 formed by the lower welded bead layer BL1 is formed between the welded beads B.

As shown in (C) of FIG. 11 and (C) of FIG. 12, a welded bead B is formed along the extending direction X of the blade 55 with respect to the welded bead layer BL2 of the lower layer, and the welded bead layer of the lower layer is formed. The welded bead layer BL3 is laminated so as to close the gap GB2 formed in BL2.

As described above, by laminating the welded bead layers BL1, BL2, and BL3 in order on the base layer BLU, the blade 55 is formed, and the inside thereof is formed into a curved cross-sectional portion 63B having a curved axial cross-sectional view. It is possible to form a wing passage 63 composed of a hollow portion.

As described above, according to the present embodiment, when the welded beads B are laminated to form the blade 55, a hollow portion is formed by leaving a gap between the welded beads B to form a hollow portion in a cross-sectional view of the shaft. The blade flow path 63 surrounded by the welded bead B can be formed along the extending direction of the welded bead B. As a result, it is possible to easily and at low cost to manufacture the modeled object W capable of efficiently cooling the blade 55 as compared with casting using a core.

Further, in the blade flow path forming step, by narrowing the gaps GA1 and GA2 in the welded bead layers BL1 and BL2 to be laminated from the lower layer to the upper layer, a large cross-sectional area can be secured with a small number of passes. The wing passage 63 having a trapezoidal cross-sectional portion 63A can be easily formed.

Further, in the wing flow path forming step, the welded bead layer BL1 on the lower layer side forms two gaps GB1, and the welded bead layer BL2 on the upper layer side forms one gap GB2 connected to the two gaps GB1 in the lower layer. As a result, it is possible to easily form the wing portion flow path 63 having the curved cross-sectional portion 63B having a curved shape in the axial cross-sectional view in which the cooling medium can flow over a wide range.

Moreover, since the blade flow path 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, the wall thickness from the outer surface of the blade 55 to the blade flow path 63 is made uniform. And the blade 55 can be cooled evenly.

Further, by forming the internal flow path 65 on the outer periphery of the shaft body 51, it is possible to easily and at low cost to manufacture the modeled object W capable of efficiently cooling a wider range.

Further, by forming the connecting flow path 67 connecting the internal flow path 65 and the wing portion flow path 63, the cooling medium is circulated between the internal flow path 65 and the wing portion flow path 63 via the connection flow path 67. Can be done. As a result, the inside of the modeled object W and the blade 55 can be cooled efficiently and uniformly. Further, by circulating the cooling medium between the blade flow path 63 and the internal flow path 65, it is possible to easily determine the presence or absence of blockage in the cooling flow path 61.

In the above embodiment, a case is exemplified in which a wing passage 63 having a trapezoidal cross-section portion 63A on both end sides and a curved cross-section portion 63B on the center side is modeled, but the wing passage 63 is trapezoidal over the entire length. It may be a cross-section portion 63A or a curved cross-section portion 63B.

As described above, the present invention is not limited to the above-described embodiment, and can be modified or applied by those skilled in the art based on the combination of the configurations of the embodiments with each other, the description of the specification, and the well-known technique. It is also a matter of the present invention to do so, and it is included in the scope of seeking protection.

As described above, the following matters are disclosed in this specification.
(1) A method for manufacturing a shaped object having a shaped portion having a wing portion formed by laminating a welded bead obtained by melting and solidifying a filler metal on the outer periphery of a rod-shaped shaft body. ,
At the time of modeling the modeling portion, the wing portion modeling step of forming the welding bead along the extending direction of the wing portion to form the wing portion is performed, and the wing portion modeling step is performed.
In the wing shaping process,
When the welded beads are laminated, a hollow portion is formed by leaving a gap between the welded beads so that the wing flow path surrounded by the welded beads can be formed along the extending direction of the welded beads in the axial cross-sectional view. A method for manufacturing a modeled object, which performs a step of forming a wing flow path.
According to this method of manufacturing a modeled object, when the welded beads are laminated to form a wing portion, a hollow portion is formed by leaving a gap between the welded beads, so that the welded beads are surrounded by the welded beads in a cross-sectional view. The wing flow path can be formed along the extending direction of the welded bead. As a result, it is possible to easily and at low cost to manufacture a modeled object capable of efficiently cooling the wing portion as compared with casting using a core.

(2) When forming at least a part of the wing flow path in the wing flow path forming step,
The production of the model according to (1), wherein the gap in the welded bead layer composed of the plurality of welded beads is narrowed from the lower layer to the upper layer to form the trapezoidal wing channel in the axial cross-sectional view. Method.
According to the manufacturing method of this model, by narrowing the gap in the welded bead layer to be laminated from the lower layer to the upper layer, a large cross-sectional area can be secured with a small number of passes. Can be easily formed.

(3) When forming at least a part of the wing flow path in the wing flow path forming step,
In a welded bead layer composed of a plurality of the welded beads, two said gaps are formed on the lower layer side, and one said gap connected to the two gaps of the lower layer is formed on the upper layer side. The method for manufacturing a model according to (1) or (2), which forms the wing flow path of the above.
According to this method of manufacturing a modeled object, two gaps are formed in the welded bead layer on the lower layer side, and one gap connected to the two gaps in the lower layer is formed in the welded bead layer on the upper layer side, thereby forming a wide range. A curved wing flow path can be easily formed in a cross-sectional view of an axis through which a cooling medium can flow.

(4) In the wing flow path forming step,
One of (1) to (3) that forms a gap between the welded beads so that the surface of the wing flow path along the outer surface of the wing is parallel to the outer surface of the wing. The method for manufacturing a model as described in.
According to this method of manufacturing a modeled object, a wing flow path is formed so that the surface along the outer surface of the wing is parallel to the outer surface of the wing, so that the wing flow path from the outer surface of the wing to the wing flow path. The wall thickness can be made uniform, and the wings can be cooled evenly.

(5) An internal flow path forming step of forming an internal flow path by forming a groove on the outer periphery of the shaft and laminating the welded bead on the outer periphery of the shaft so as to close the opening of the groove. The method for manufacturing a model according to any one of (1) to (4), which includes.
According to this method for manufacturing a modeled object, by forming an internal flow path on the outer periphery of the shaft body, a modeled object capable of efficiently cooling a wider range can be easily and inexpensively manufactured.

(6) The method for manufacturing a modeled object according to (5), wherein when the modeled portion is modeled, a connecting flow path forming step for forming a connecting flow path connecting the internal flow path and the wing portion flow path is performed. ..
According to this method of manufacturing a modeled object, by forming a connecting flow path connecting the internal flow path and the wing section flow path, a cooling medium is circulated between the internal flow path and the wing section flow path via the connection flow path. Can be made to. As a result, the inside of the modeled object and the wing portion can be cooled efficiently and uniformly. Further, by circulating the cooling medium between the blade flow path and the internal flow path, it is possible to easily determine the presence or absence of blockage in the flow path.

(7) A rod-shaped shaft and
A molding portion provided on the outer periphery of the shaft body and having a wing portion formed by laminating welded beads obtained by melting and solidifying a filler metal, and a molding portion.
A wing flow path formed along the wing in the modeling portion,
The internal flow path formed around the shaft body and
Has a model.
According to this modeled object, it has a wing portion flow path formed along the wing portion and an internal flow path formed around the shaft body. Therefore, by flowing a cooling medium through these wing passages and the internal flow passage, a wide range including the wing can be efficiently cooled.

(8) The model according to (7), which has a connecting flow path communicating with the internal flow path and the wing portion flow path.
According to this model, since the internal flow path and the wing section flow path are connected by the connecting flow path, the cooling medium can be circulated between the internal flow path and the wing section flow path via the connecting flow path. can. As a result, the inside of the modeled object and the wing portion can be cooled efficiently and uniformly. Further, by circulating the cooling medium between the blade flow path and the internal flow path, it is possible to easily determine the presence or absence of blockage in the flow path.

(9) At least a part of the wing flow path is
Formed in a trapezoidal shape in cross-sectional view of the axis
The model according to (7) or (8), wherein the surface along the outer surface of the wing portion is parallel to the outer surface of the wing portion.
According to this modeled object, since the wing flow path is formed in a trapezoidal shape in a cross-sectional view of the shaft, the cooling medium can flow smoothly. Further, since the surface of the trapezoidal wing flow path along the outer surface of the wing is parallel to the outer surface of the wing, the wall thickness from the outer surface of the wing to the wing flow path can be made uniform. , The wings can be cooled evenly.

(10) At least a part of the wing flow path is
It is formed in a curved shape in the axial cross section,
The model 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 model, since the wing flow path is formed in a curved shape in the axial cross section, the cooling medium can flow over a wide range in the axial cross section. Further, since the surface of the curved wing flow path along the outer surface of the wing has a surface parallel to the outer surface of the wing, the wall thickness from the outer surface of the wing to the wing flow path should be made uniform. And the wings can be cooled evenly.

This application is based on a Japanese patent application filed on December 16, 2020 (Japanese Patent Application No. 2020-208451) and a Japanese patent application filed on September 27, 2021 (Japanese Patent Application No. 2021-156815). Its contents are incorporated herein by reference.

51 Shaft 53 Modeling part 55 Blade (wing part)
59 Groove 63 Wing flow path 65 Internal flow path 67, 67A to 67D Connection flow path B Welding bead BL1, BL2, BL3 Welding bead layer GA1, GA2, GB1, GB2 Gap M Welding material W Modeled object X Extension direction

Claims

It is a method for manufacturing a modeled object having a modeled object having a wing portion formed by laminating a welded bead obtained by melting and solidifying a filler metal on the outer periphery of a rod-shaped shaft body.
At the time of modeling the modeling portion, the wing portion modeling step of forming the welding bead along the extending direction of the wing portion to form the wing portion is performed, and the wing portion modeling step is performed.
In the wing shaping process,
When the welded beads are laminated, a hollow portion is formed by leaving a gap between the welded beads so that the wing flow path surrounded by the welded beads can be formed along the extending direction of the welded beads in the axial cross-sectional view. Perform the wing flow path forming process to be formed.
Manufacturing method of the modeled object.
When forming at least a part of the wing flow path in the wing flow path forming step,
By narrowing the gap in the welded bead layer composed of the plurality of welded beads from the lower layer to the upper layer, the trapezoidal wing flow path is formed in the axial cross-sectional view.
The method for manufacturing a model according to claim 1.
When forming at least a part of the wing flow path in the wing flow path forming step,
In a welded bead layer composed of a plurality of the welded beads, two said gaps are formed on the lower layer side, and one said gap connected to the two gaps of the lower layer is formed on the upper layer side. Forming the wing flow path of
The method for manufacturing a model according to claim 1.
When forming at least a part of the wing flow path in the wing flow path forming step,
In a welded bead layer composed of a plurality of the welded beads, two said gaps are formed on the lower layer side, and one said gap connected to the two gaps of the lower layer is formed on the upper layer side. Forming the wing flow path of
The method for manufacturing a model according to claim 2.
In the wing flow path forming step,
A gap between the welded beads is formed so that the surface of the wing flow path along the outer surface of the wing is parallel to the outer surface of the wing.
The method for manufacturing a model according to any one of claims 1 to 4.
The process includes an internal flow path forming step of forming an internal flow path by forming a groove on the outer periphery of the shaft and laminating the welded bead on the outer periphery of the shaft so as to close the opening of the groove.
The method for manufacturing a model according to any one of claims 1 to 4.
The process includes an internal flow path forming step of forming an internal flow path by forming a groove on the outer periphery of the shaft and laminating the welded bead on the outer periphery of the shaft so as to close the opening of the groove.
The method for manufacturing a model according to any one of claims 5.
When modeling the modeling portion, a connection flow path forming step of forming a connection flow path connecting the internal flow path and the wing portion flow path is performed.
The method for manufacturing a model according to claim 6.
When modeling the modeling portion, a connection flow path forming step of forming a connection flow path connecting the internal flow path and the wing portion flow path is performed.
The method for manufacturing a model according to claim 7.
With a rod-shaped shaft
A molding portion provided on the outer periphery of the shaft body and having a wing portion formed by laminating welded beads obtained by melting and solidifying a filler metal, and a molding portion.
A wing flow path formed along the wing in the modeling portion,
The internal flow path formed around the shaft body and
Have,
Modeled object.
It has a connecting flow path that communicates with the internal flow path and the wing flow path.
The model according to claim 10.
At least a part of the wing flow path
Formed in a trapezoidal shape in cross-sectional view of the axis
A surface along the outer surface of the wing is parallel to the outer surface of the wing.
The model according to claim 10.
At least a part of the wing flow path
Formed in a trapezoidal shape in cross-sectional view of the axis
A surface along the outer surface of the wing is parallel to the outer surface of the wing.
The model according to claim 11.
At least a part of the wing flow path
It is formed in a curved shape in the axial cross section,
The surface along the outer surface of the wing has a surface parallel to the outer surface of the wing.
The model according to any one of claims 10 to 13.