JP2022039535A - Manufacturing method of molded article and molded article - Google Patents

Abstract

To provide a manufacturing method of a molded article capable of manufacturing efficiently a high quality molded article, forming weld beads accurately around a shaft body while inhibiting generation of non-welded portion and provide the molded article.SOLUTION: A manufacturing method of a molded article comprises: a wall portion molding step of molding a plurality of wall portions 53 in a circumferential direction of a shaft body 51 at intervals in an axial direction; and an inside molding step of forming weld beads B2 which are each wider than the wall portion 53 in the circumferential direction of the shaft body 51 within a filling range FR between the wall portions 53 while sequentially arranging the weld beads adjacently toward an axial direction of the shaft body 51 to fill the filling range FR with the weld beads B2. The inside molding step performs a trajectory changing process of directing a trajectory of the weld bead B2 toward the axial direction of the shaft body 51 at a position the weld bead B2 being formed toward one side of the circumferential direction of the shaft body 51 contacts the weld bead B2 previously formed, and, further, directing the trajectory of the weld bead toward the one side of the circumferential direction of the shaft body 51 at a position adjacent to the existing weld bead B2 in the axial direction of the shaft body 51.SELECTED DRAWING: Figure 3D

Description

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

In recent years, the needs for 3D printers as a means of production have been increasing, and research and development have been carried out for practical use in the aircraft industry and the like, 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.

In Patent Document 1, a first pass along the first direction and a second pass along a second direction different from the first direction are repeated to fill the frame with beads, and between the first pass and the second pass. In, it is described that a folding path extending in a direction away from the second path and folding back in a direction toward the second path is provided.

Japanese Unexamined Patent Publication No. 2018-86664

By the way, in order to form a model by laminating welded beads on the outer periphery of the shaft body, if welded beads along the circumferential direction are formed while being adjacent to each other in the axial direction, the number of welding bead forming passes increases and the production efficiency decreases. Resulting in. Further, in this case, since a joint between the start end and the end is formed in each welded bead formed along the circumferential direction, an unwelded portion or an uneven portion is likely to occur, which causes quality deterioration.

As in Patent Document 1, if the welded bead is folded back and filled, it is possible to reduce the number of paths for forming the welded bead. The dimensions of the shaped part will fluctuate.

Therefore, the present invention provides a method for manufacturing a modeled object and a modeled object capable of efficiently producing a high-quality modeled object by accurately forming a welded bead around the shaft while suppressing the generation of unwelded portions. The purpose is to provide.

The present invention has the following configuration.
(1) A method for manufacturing a modeled object, in which welded beads are repeatedly laminated around a shaft body to produce a modeled object.
A wall forming process in which a plurality of walls made of welded beads formed in the circumferential direction of the shaft are formed at intervals in the axial direction.
Within the filling range surrounded by the wall portions, welded beads wider than the wall portions are formed in the circumferential direction of the shaft body and are adjacent to each other in order toward the axial direction of the shaft body to form the filling range. The internal molding process of filling with weld beads and
Including
In the internal modeling process,
At the point where the welded bead formed toward one of the circumferential directions of the shaft body comes into contact with the existing welded bead that has already been formed, the trajectory of the welded bead is directed in the axial direction of the shaft body, and further to the existing welded bead. On the other hand, an orbit conversion process is performed in which the orbit of the welded bead is directed to one of the circumferential directions of the shaft at a position adjacent to the shaft in the axial direction.
Manufacturing method of the modeled object.
(2) Shaft body and
A plurality of wall portions made of welded beads formed in the circumferential direction of the shaft body and formed at intervals in the axial direction of the shaft body, and
A shaped portion formed within a filling range surrounded by the wall portions by a welded bead wider than the wall portion, and a shaped portion.
Have,
The modeling part is
A plurality of annular portions formed of the welded beads formed in the circumferential direction of the shaft body and adjacent to each other in the axial direction of the shaft body, and a plurality of annular portions.
A connecting portion made of the welded bead that connects one end and the other end of the adjacent annular portion,
Have,
Modeled object.

According to the present invention, a welded bead can be accurately formed around a shaft body while suppressing the generation of an unwelded portion, and a high-quality model can be efficiently manufactured.

It is a block diagram of the manufacturing system used for manufacturing the modeled object of this invention. It is the schematic sectional drawing of the shaft body explaining the method of forming the welding bead to the shaft body. It is a schematic side view along the axial direction of the modeled product in the middle of manufacturing which shows 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 shows 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 shows 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 shows 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 shows 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 shows 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 shows 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 shows the manufacturing process of the modeled object. It is schematic cross-sectional view of the filling part explaining the adjustment control of the position at the time of filling the welding bead into the gap between the shaped parts. It is a schematic side view along the axial direction of the modeled product in the middle of manufacturing which shows another example of the method of filling the welding bead into the filling range in an internal modeling process. It is a schematic side view along the axial direction of the modeled product in the middle of manufacturing which shows another example of the method of filling the welding bead into the filling range in an internal modeling process. It is a figure which shows the example of the formation of the welded bead in the filling range, and (A)-(C) is the schematic side view along the axial direction of the model which shows the formation state of the welded bead in each layer. It is schematic cross-sectional view of the shaft body explaining how to shift the position of the trajectory conversion process.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram of a manufacturing system used for manufacturing the modeled object of the present invention.
The model manufacturing system 100 having this configuration includes a laminated modeling device 11, a controller 13 that controls the laminated modeling device 11, and a power supply device 15.

The laminated modeling device 11 includes a welding robot 19 provided with a torch 17 on a tip shaft, and a filler material supply unit 21 that supplies a filler metal (welding wire) M to the torch 17.

The welding robot 19 is an articulated robot, and the filler metal M is continuously supplied to the torch 17 attached to the tip shaft of the robot arm. 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 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, and is appropriately selected according to the model to be manufactured. ..

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 supplied 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 B that is a melt-solidified body of the filler metal M is formed.

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 inputs or creates shape data (CAD data, etc.) of the modeled object W to be produced, and cooperates with the trajectory calculation unit 33 to stack welded beads B representing the modeling procedure of the modeled object. Generate a model. That is, the shape data is divided into a plurality of layers to generate layer shape data representing the shape of each layer. Then, the movement locus of the torch 17 is determined based on the layer shape data of the generated laminated model. The CAD / CAM unit 31 generates a drive program for the welding robot 19 and the power supply device 15 that move the torch 17 to form a welded bead based on the generated layer shape data and data such as the movement locus of the torch 17. .. Various data such as the generated drive program are stored in the storage unit 35.

The control unit 37 executes the drive program stored in the storage unit 35 to drive the welding robot 19, the power supply device 15, and the like. Then, the welding robot 19 moves the torch 17 while melting the filler metal M with an arc based on the trajectory trajectory of the torch 17 generated by the trajectory calculation unit 33 in response to a command from the controller 13.

As the filler metal 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) and the like. Wire can be used.

FIG. 2 is a schematic cross-sectional view of a shaft body for explaining how to form a welded bead on the shaft body.
As shown in FIG. 2, in the manufacturing system 100 having the above configuration, the torch 17 is moved by the driving of the welding robot 19 along the movement locus of the torch 17 generated from the set layer shape data, and the shaft body 51 is used. The welded bead B made of the molten filler material M is laminated around the shaft body 51 by the torch 17 while rotating around the shaft to manufacture the model W. The shaft body 51 is, for example, a round bar body having a circular cross section such as a steel rod, and both ends thereof are supported by a support portion 63 provided on the base 61 and are rotatable (see FIG. 1). ..

Next, a method for manufacturing the modeled object of the present invention will be described.
3A to 3H are schematic side views along the axial direction of the modeled object in the process of manufacturing, showing the manufacturing process of the modeled object. FIG. 4 is a schematic cross-sectional view of a filling portion for explaining control when filling the gap between the shaped portions with the welded bead.

(Wall modeling process)
As shown in FIG. 3A, the weld bead B1 is formed on the peripheral surface of the shaft body 51 by the torch 17 while rotating the shaft body 51. As a result, a plurality of wall portions 53 made of welded beads B1 formed in the circumferential direction are formed on the shaft body 51 at intervals in the axial direction of the shaft body 51. In this example, two wall portions 53 are modeled with respect to the shaft body 51 at intervals from each other. In the shaft body 51 in which the plurality of wall portions 53 are formed, the region along the axial direction of the wall portions 53 is set as the filling range FR. When forming the welded bead B1 for forming the wall portion 53, for example, it is preferable to form a precise welded bead with a low heat input amount. As a result, the wall portion 53 can be molded with high accuracy while suppressing the drooling of the welded bead B1.

(Internal modeling process)
As shown in FIG. 3B, the welded bead B2 is formed in the circumferential direction of the shaft body 51 from one wall portion 53 side within the filling range FR surrounded by the wall portions 53. As a result, as shown in FIG. 3C, an annular portion 54 made of the welded bead B2 is formed around the shaft body 51. The welded bead B2 is preferably wider than the welded bead B1 forming the wall portion 53. By widening the welded bead B2, the filling efficiency within the filling range FR can be improved. In order to widen the welded bead B2, the welding speed may be lowered or the feeding speed of the filler metal M may be increased, and the torch 17 may be reciprocated in a direction intersecting the orbital direction of the welded bead B2. Weaving may be performed.

Then, at a point where the end portion of the welded bead B2 forming the annular portion 54 comes into contact with the already formed existing welded bead B2, the rotation of the shaft body 51 and the movement of the torch 17 by the welding robot 19 are controlled to control the trajectory. Perform conversion processing.

As shown in FIG. 3D, in the orbit conversion process, first, the orbit of the welded bead B2 formed toward one of the circumferential directions of the shaft body 51 is directed to the axial direction of the shaft body 51. Further, the trajectory of the welded bead B2 directed in the axial direction of the shaft body 51 is one of the circumferential directions of the shaft body 51 at a position adjacent to the annular portion 54 made of the existing welded bead B2 in the axial direction of the shaft body 51. Turn to.

In this orbital conversion process, if the welding rate is constant, the amount of welded bead B2 welded locally increases at the orbital conversion point and rises at the bent portion. Therefore, in the orbital conversion process, the welding rate of the welded bead B2 is adjusted to keep the welding amount of the welded bead B2 constant. Specifically, when converting the trajectory of the welded bead B2, the welding speed is increased or the feeding speed of the filler metal M is decreased. Then, at the conversion point of the orbit of the welded bead B2, the welding speed of the welded bead B2 is lowered and the amount of welding becomes constant, and the local fluctuation of the shape of the weld metal such that the bent portion at the changed part of the orbit rises is suppressed. Therefore, the occurrence of uneven shape on the surface is suppressed. When weaving is performed, the weaving amplitude may be reduced to change the welding speed.

As shown in FIG. 3E, when the formation of the welded bead B2 in the circumferential direction of the shaft body 51 and the orbital conversion process at the contact point with the annular portion 54 made of the existing welded bead B2 are repeated, the end portion of the annular portion 54 is reached. The start end portion is continuously formed via the connecting portion 55. Then, on one wall portion 53 side in the filling range FR, a modeling portion 57 in which a plurality of annular portions 54 are connected by the connecting portion 55 is formed. The welded bead B2 is joined to the end of the annular portion 54 with the contact point with the annular portion 54 as the end point to complete the welding.

As shown in FIG. 3F, the modeling portion 57 is also provided on the other wall portion 53 side within the filling range FR surrounded by the wall portions 53. Specifically, a welded bead B2 wider than the wall portion 53 is formed in the circumferential direction of the shaft body 51 from the other wall portion 53 side, and the end portion of the welded bead B2 is an annular portion made of the existing welded bead B2. The orbit conversion process is performed at the point where it comes into contact with 54. Then, the formation of the welded bead B2 in the circumferential direction of the shaft body 51 and the orbital conversion process at the contact point with the annular portion 54 made of the existing welded bead B2 are repeated. As a result, in the filling range FR, on the other wall portion 53 side, the modeling portion 57 in which the end portion and the start end portion of the plurality of annular portions 54 are continuously formed via the connecting portion 55 is provided on the one wall portion 53 side. A gap G is opened with respect to the modeling portion 57 formed in the above.

As shown in FIG. 3G, in the gap G between the modeling portions 57, the welded bead B2 is formed over the circumferential direction of the shaft body 51 while rotating the shaft body 51. As a result, as shown in FIG. 3H, the gap G is filled with the welded bead B2.

When filling the gap G with the welded bead B2, it is preferable to reciprocate the torch 17 in the width direction with respect to the gap G to weave it. As a result, the gap G can be satisfactorily filled by the welded bead B2.

At this time, as shown in FIG. 4, the welded bead B2 filled in the gap G can be welded to the groove surrounded by the left and right modeling portions 57. Therefore, it is preferable to control the groove copying by the arc sensor for the formation of the welded bead B2 in the gap G. Specifically, in the gap G regarded as the groove, the change in the welding current caused by the change in the distance between the filler metal M and the base is detected. Then, the center of the gap G is determined based on the change in the welding current, and the position of the torch 17 is adjusted to an appropriate position in the width direction X orthogonal to the gap G.

By forming the welded bead B2 while correcting the position of the torch 17 in this way, it is possible to flexibly fill the gap G in response to the gap G that changes due to changes in the width dimension of the modeling portion 57 and the modeling position. can.

The welded bead B2 formed in the gap G measures the shape of the welded portion using a laser sensor or the like to obtain the excess or deficiency of the welded amount and performs feedback control in real time to change the welding conditions to the shape of the welded portion. It may be formed while being corrected together.

By repeating the above steps, a model W in which the filling range FR inside the wall portion 53 in which the welded bead B1 is laminated around the shaft body 51 is filled with the welded bead B2 is formed.

As described above, according to the method for manufacturing a modeled object according to the present embodiment, a portion where the welded bead B2 formed toward one of the circumferential directions of the shaft body 51 comes into contact with the existing welded bead B2 already formed. Then, the orbit of the welded bead B2 is directed in the axial direction of the shaft body 51, and further, the orbital conversion is directed in one of the circumferential directions of the shaft body 51 at a position adjacent to the existing welded bead B2 in the axial direction of the shaft body 51. Perform processing. As a result, the welding bead B2 can be formed and filled with a smaller number of passes per one layer in the filling range FR as compared with the case where a plurality of welded beads extending in the circumferential direction are formed for each round and adjacent to each other in the axial direction. Further, the number of start ends and ends of the welded bead B2 that fills the space between the wall portions 53 can be reduced, and the generation of unwelded portions can be suppressed to produce a high-quality model. Moreover, since it is not necessary to turn on / off the power supply each time the welded bead B2 is formed in the circumferential direction, the time required for modeling can be shortened and the production efficiency can be improved.

Further, since the welding bead B2 extending in the circumferential direction is formed in the gap G between the two modeling portions 57 to fill the gap G between the modeling portions 57, the width of the welding bead B2 that fills the gap G is adjusted to fill the gap G. It is possible to satisfactorily fill the filling range FR by flexibly responding to the gap G that changes due to the width dimension of 57 and the fluctuation of the modeling position. Further, regardless of the size of the filling range FR surrounded by the wall portions 53, the welding bead B2 can be formed and filled in the filling range FR in 3 passes per layer. Further, when modeling each modeling portion 57, modeling is performed from the wall portion 53 side, respectively. Therefore, when the welded bead B2 is formed at the position adjacent to each wall portion 53, the torch 17 can be tilted to avoid interference with the wall portion 53, and the welded bead B2 can be smoothly formed.

Further, when the orbit of the welded bead B2 is converted by the orbital conversion process, the welding speed of the welded bead B2 is adjusted to make the welding amount of the welded bead B2 constant. As described above, by making the welding amount of the welded bead B2 constant during the orbital conversion process, it is possible to suppress local fluctuations in the shape of the weld metal and suppress the occurrence of uneven shapes on the surface.

In the above embodiment, the two wall portions 53 are formed on the shaft body 51 to fill the filling range FR partitioned by the wall portions 53, but three or more wall portions 53 are formed and each of them is formed. The welded bead B2 may be filled in a plurality of filling range FRs partitioned by the wall portion 53.

Here, another example of how to fill the welded bead B2 into the filling range FR in the internal molding step will be described.
5A and 5B are schematic side views along the axial direction of the modeled object in the process of being manufactured, showing another example of how the welded bead is filled in the filling range in the internal modeling process.

As shown in FIG. 5A, in the filling range FR surrounded by the wall portions 53, a welded bead B2 wider than the wall portion 53 is formed from one wall portion 53 side in the circumferential direction of the shaft body 51, and the shaft is formed. An annular portion 54 made of a welded bead B2 is formed around the body 51. At a point where the end of the welded bead B2 forming the annular portion 54 comes into contact with the already formed existing welded bead B2, the rotation of the shaft body 51 and the movement of the torch 17 by the welding robot 19 are controlled to perform trajectory conversion processing. I do. Then, the formation of the welded bead B2 on the shaft body 51 in the circumferential direction and the orbital conversion process are repeated to form a modeling portion composed of a plurality of annular portions 54 continuously formed via the connecting portion 55. As shown in FIG. 5B, when the formation position of the welded bead B2 reaches the other wall portion 53 side in the filling range FR, the welded bead B2 is welded with the contact point with the annular portion 54 made of the existing welded bead B2 as the end point. To end.

According to this method of filling with the welded bead B2, the welded bead B2 can be filled in the filling range FR surrounded by the wall portions 53 in one pass.

Further, when the welded bead B2 is laminated on the filling range FR by the internal molding step, it is preferable to shift the position of the orbital conversion process in each layer in the direction intersecting the laminating direction. In this way, when the welded beads B2 are laminated in the filling range FR, the positions of the orbital conversion processes in each layer are shifted in the direction intersecting the laminating direction, thereby avoiding the overlap of the positions of the orbital conversion processes in the laminating direction. This makes it possible to suppress the occurrence of local unevenness due to the connecting portions 55 formed by the orbital conversion process overlapping in the stacking direction.

Here, an example of how to shift the position of the orbital conversion process in each layer in the direction intersecting the stacking direction when laminating the welded bead B2 on the filling range FR by the internal molding step will be described. Here, a case where the modeling portions 57 from the first layer to the third layer are laminated on the outer periphery of the shaft body 51 will be described as an example.
FIG. 6 is a diagram showing an example of forming the welded bead B2 in the filling range FR, and FIGS. 6A to 6C are schematic side surfaces along the axial direction of the modeled object showing the formation state of the welded bead B2 in each layer. It is a figure. FIG. 7 is a schematic cross-sectional view of the shaft body 51 for explaining how to shift the position of the trajectory conversion process.

As shown in FIG. 6A, the welded bead B2 is formed in the filling range FR while the positions of the orbital conversion processing are arranged in a spiral shape. As a result, the first-layer modeling portion 57 in which the connecting portion 55 formed by the orbital conversion process is arranged in a spiral shape is formed.

Next, on the outer periphery of the modeled portion 57 of the first layer that has been modeled, the modeled portion 57 of the second layer, which is the upper layer, is modeled. Also at this time, as shown in FIG. 6B, the welded bead B2 is formed in the filling range FR while the positions of the orbital conversion processing are arranged in a spiral shape. As a result, the modeling portion 57 in which the connecting portion 55 formed by the trajectory conversion process is arranged in a spiral shape is formed. At this time, the welded bead B2 is formed so as to shift the position of the orbital conversion process in the direction intersecting the stacking direction with respect to the modeling portion 57 in the lower layer. Specifically, as shown in FIG. 7, the position where the orbit conversion process is performed is shifted about the axis by an angle θ, and the spiral formed by the orbit conversion process is formed for the spiral passing through the connection portion 55 in the lower layer modeling portion 57. The phase of the spiral passing through the portion 55 is shifted in the circumferential direction.

After that, on the outer periphery of the second-layer modeling portion 57 that has been modeled, the third-layer modeling portion 57, which is an upper layer, is further modeled. Also at this time, as shown in FIG. 6C, the welded bead B2 is formed in the filling range FR while the positions of the orbital conversion processing are arranged in a spiral shape. As a result, the modeling portion 57 in which the connecting portion 55 formed by the trajectory conversion process is arranged in a spiral shape is formed. Also at this time, the position where the orbit conversion process is performed is shifted about the axis by an angle θ, and the phase of the spiral passing through the connecting portion 55 formed by the orbit conversion process is the phase of the spiral passing through the connecting portion 55 in the lower layer modeling portion 57. The welded bead B2 is formed so as to be displaced in the circumferential direction.

In this way, if the position of the orbital conversion process is shifted in the direction intersecting the stacking direction in each layer to form the modeling portion 57 in which the position of the connecting portion 55 is displaced in the direction intersecting the stacking direction, for example, the connection is formed. Even if the welded bead B2 in the portion 55 is displaced in height as compared with other portions, the position (phase) of the connecting portion 55 is shifted in the direction intersecting the stacking direction for each layer, so that the connecting portion is connected. The height deviation at 55 can be dispersed in the circumferential direction as the stacking is performed. As a result, it is possible to alleviate and suppress the increase in local height deviation.

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 mutual combination of the configurations of the embodiments, 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 modeled object, in which welded beads are repeatedly laminated around a shaft body to produce a modeled object.
A wall forming process in which a plurality of walls made of welded beads formed in the circumferential direction of the shaft are formed at intervals in the axial direction.
Within the filling range surrounded by the wall portions, welded beads wider than the wall portions are formed in the circumferential direction of the shaft body and are adjacent to each other in order toward the axial direction of the shaft body to form the filling range. The internal molding process of filling with weld beads and
Including
In the internal modeling process,
At the point where the welded bead formed toward one of the circumferential directions of the shaft body comes into contact with the existing welded bead that has already been formed, the trajectory of the welded bead is directed in the axial direction of the shaft body, and further to the existing welded bead. On the other hand, a method for manufacturing a modeled object, which performs an orbit conversion process in which the orbit of a welded bead is directed to one of the circumferential directions of the shaft at a position adjacent to the shaft in the axial direction.
According to this method for manufacturing a modeled object, the welding bead is formed and filled with a smaller number of passes per one layer in the filling range as compared with the case where a plurality of welded beads extending in the circumferential direction are formed one round and adjacent to each other in the axial direction. be able to. In addition, the number of start ends and ends of the welded beads that fill the space between the wall portions can be reduced, and the generation of unwelded portions can be suppressed to produce a high-quality model. Moreover, since it is not necessary to turn on / off the power supply each time the welded bead is formed in the circumferential direction, the time required for modeling can be shortened and the production efficiency can be improved.

(2) In the internal modeling process,
A plurality of shaped portions are formed by continuously orbiting the welded bead within the filling range while performing the orbital conversion process.
The method for manufacturing a modeled object according to (1), wherein a welded bead extending in the circumferential direction is formed in a gap formed between the shaped portions to fill the gap between the shaped portions.
According to this method for manufacturing a modeled object, a welded bead is formed in the gap between a plurality of shaped parts in the circumferential direction to fill the gap between the shaped parts. Therefore, by adjusting the width of the welded bead that fills the gap, the model is formed. It is possible to flexibly respond to gaps that change due to fluctuations in the width dimension of the portion and the modeling position, and to fill the filling range satisfactorily.

(3) Two of the modeling portions are modeled from both ends of the filling range.
The method for manufacturing a modeled object according to (2), wherein a welded bead extending in the circumferential direction is formed in a gap between the two modeling portions to fill the gap between the modeling portions.
According to this method for manufacturing a modeled object, a welded bead can be formed and filled in 3 passes per layer in the filling range regardless of the size of the filling range surrounded by the wall portions.

(4) When converting the orbit of the welded bead by the orbit conversion process,
The method for producing a model according to any one of (1) to (3), wherein the welding rate of the welded bead is adjusted to keep the welding amount of the welded bead constant.
According to this method for manufacturing a modeled object, by keeping the amount of welded beads welded constant during the orbital conversion process, local fluctuations in the shape of the weld metal are suppressed, and the generation of uneven shapes on the surface is suppressed. be able to.

(5) When the welded bead is laminated in the filling range by the internal molding step,
The method for manufacturing a model according to any one of (1) to (4), wherein the position of the orbital conversion process in each layer is shifted in a direction intersecting the stacking direction.
According to this method for manufacturing a modeled object, when the welded beads are laminated in the filling range, the position of the orbital conversion process in each layer is shifted in the direction intersecting the laminating direction, so that the position of the orbital conversion process is moved toward the stacking direction. It is possible to avoid overlapping of the above and suppress the occurrence of local unevenness.

(6) Shaft body and
A plurality of wall portions made of welded beads formed in the circumferential direction of the shaft body and formed at intervals in the axial direction of the shaft body, and
A shaped portion formed within a filling range surrounded by the wall portions by a welded bead wider than the wall portion, and a shaped portion.
Have,
The modeling part is
A plurality of annular portions formed of the welded beads formed in the circumferential direction of the shaft body and adjacent to each other in the axial direction of the shaft body, and a plurality of annular portions.
A connecting portion made of the welded bead that connects one end and the other end of the adjacent annular portion,
Have,
Modeled object.
According to this model, a plurality of wall portions are formed around the shaft body, and the plurality of annular portions and one end and the other end of the annular portions adjacent to each other are connected to each other in the filling range surrounded by the wall portions. A modeling part consisting of a connecting part is formed. That is, according to this model, a plurality of wall portions are formed around the shaft body by welding beads, and an annular portion and a connecting portion are formed by the welding beads in one pass in the filling range surrounded by the wall portions. The part can be shaped.

(7) In the filling range, the two modeling portions are modeled with a gap between them.
The model according to (6), wherein the gap between the shaped portions is filled with a welded bead formed along the circumferential direction of the shaft body.
According to this model, the gap between the two models formed in the filling range is filled with the weld bead. That is, according to this modeled object, it is possible to easily model by forming two modeling portions within the filling range and forming and filling a welded bead in the gap between the modeling portions.

(8) The model according to (6) or (7), wherein the welded bead is laminated in the filling range, and the position of the connecting portion of the welded bead is shifted in a direction intersecting the laminating direction in each layer. ..
According to this model, the position of the connecting portion in each layer of the welded beads laminated in the filling range is shifted in the direction intersecting the laminating direction, so that the local unevenness due to the overlapping of the connecting portions in the laminating direction is caused. The occurrence can be suppressed.

51 Shaft 53 Wall 54 Circular 55 Connecting 57 Modeling part B, B1, B2 Welding bead FR Filling range G Gap W Modeling

Claims (8)

It is a manufacturing method of a modeled object in which welded beads are repeatedly laminated around a shaft body to produce a modeled object.
A wall forming process in which a plurality of walls made of welded beads formed in the circumferential direction of the shaft are formed at intervals in the axial direction.
Within the filling range surrounded by the wall portions, welded beads wider than the wall portions are formed in the circumferential direction of the shaft body and are adjacent to each other in order toward the axial direction of the shaft body to form the filling range. The internal molding process of filling with weld beads and
Including
In the internal modeling process,
At the point where the welded bead formed toward one of the circumferential directions of the shaft body comes into contact with the existing welded bead that has already been formed, the trajectory of the welded bead is directed in the axial direction of the shaft body, and further to the existing welded bead. On the other hand, an orbit conversion process is performed in which the orbit of the welded bead is directed to one of the circumferential directions of the shaft at a position adjacent to the shaft in the axial direction.
Manufacturing method of the modeled object. In the internal modeling process,
A plurality of shaped portions are formed by continuously orbiting the welded bead within the filling range while performing the orbital conversion process.
A welded bead is formed in the gap formed between the shaped portions in the circumferential direction to fill the gap between the shaped portions.
The method for manufacturing a model according to claim 1. Two of the modeling portions are modeled from both ends of the filling range.
A welded bead is formed in the gap between the two shaped portions in the circumferential direction to fill the gap between the shaped portions.
The method for manufacturing a model according to claim 2. When converting the orbit of the welded bead by the orbit conversion process,
The welding rate of the welded bead is adjusted to keep the welding amount of the welded bead constant.
The method for manufacturing a model according to any one of claims 1 to 3. When the welded bead is laminated in the filling range by the internal molding step,
The position of the trajectory conversion process in each layer is shifted in the direction intersecting the stacking direction.
The method for manufacturing a model according to any one of claims 1 to 4. Axis and
A plurality of wall portions made of welded beads formed in the circumferential direction of the shaft body and formed at intervals in the axial direction of the shaft body, and
A shaped portion formed within a filling range surrounded by the wall portions by a welded bead wider than the wall portion, and a shaped portion.
Have,
The modeling part is
A plurality of annular portions formed of the welded beads formed in the circumferential direction of the shaft body and adjacent to each other in the axial direction of the shaft body, and a plurality of annular portions.
A connecting portion made of the welded bead that connects one end and the other end of the adjacent annular portion,
Have,
Modeled object. In the filling range, the two modeling portions are modeled with a gap between them.
The gap between the shaped portions is filled with the welding beads formed in the circumferential direction of the shaft body.
The model according to claim 6. The welded bead is laminated in the filling range, and the position of the connecting portion of the welded bead is shifted in each layer in a direction intersecting the laminating direction.
The model according to claim 6 or 7.

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