JP7189110B2 - LAMINATED PRODUCT MANUFACTURING METHOD AND LAMINATED MOLDED PRODUCT - Google Patents

Description

The present invention relates to a method for manufacturing a laminate-molded article and a laminate-molded article.

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

For example, by supplying powder from a hopper to a predetermined target in a chamber and irradiating a beam that is a heat source to a specified range in the target to melt and solidify the powder and stack layers, the flow path is known (see Patent Document 1).

In addition, a contour line portion is formed at a first welding speed by a layered manufacturing system in which an electrode head having an array of a plurality of electrodes is moved and the array sequentially welds materials layer by layer to form a three-dimensional part. , using a variable number of electrodes in an array of electrodes to form the filling at a second deposition rate, which is higher than the first deposition rate, is also known (US Pat.

JP 2017-180177 A JP 2018-187679 A

By the way, in the technique of Patent Document 1, in which powder is supplied from a hopper into the chamber and the target is irradiated with a beam, and in the technique of Patent Document 2, in which an electrode head having an array of a plurality of electrodes is repeatedly moved, both devices becomes a big deal. Moreover, the size of an object that can be molded is limited by the number of arrays of chambers and electrode heads, and it is difficult to form an object with a complicated shape.

On the other hand, according to the layered manufacturing technology in which welding wires are melted and solidified to layer welded beads to form a modeled object, a complicated structure having a cavity such as a cooling channel can be manufactured without the need for large-scale equipment. A laminate-molded product of any shape can be manufactured without size restrictions.

However, when a laminate-molded product having a hollow portion is manufactured by lamination molding, the welding bead forming the outer peripheral portion of the hollow portion is more likely to sag under the influence of gravity than the welding beads forming other solid portions. may occur. Therefore, there is a problem that the shape of the cavity to be formed is easily distorted.

The present invention has been made in view of the above matters, and an object of the present invention is to provide a method for manufacturing a laminate-molded article and a laminate-molded article that can easily and efficiently form a molded article having a hollow portion without distortion. is to provide

The present invention consists of the following configurations.
(1) A method for manufacturing a laminate-molded article in which a plurality of welding beads obtained by melting and solidifying a filler material are laminated to form a molded article having a hollow portion,
a modeling step of laminating the welding beads to form a laminated portion;
an installation step of installing an auxiliary member having a joint projection protruding from the outer periphery of the body portion in which the hollow portion is formed, with the joint projection directed toward the laminated portion;
a reshaping step of laminating the welding bead on the lamination portion where the auxiliary member is installed;
including
In the reshaping step, the auxiliary member is joined to the laminated portion by filling a corner portion between the laminated portion and the joint convex portion of the auxiliary member with the welding bead.
A method for producing a laminate-molded article.
(2) A laminate-molded product in which a plurality of welding beads obtained by melting and solidifying a filler material are laminated and molded, and a cavity is formed inside,
an auxiliary member having a joint convex portion projecting from the outer periphery of the body portion in which the hollow portion is formed;
a plurality of welding beads laminated around the auxiliary member;
with
The auxiliary member is arranged such that the joint convex portion is oriented in a direction opposite to the lamination direction of the welding bead.
Additive manufacturing.

ADVANTAGE OF THE INVENTION According to this invention, the model which has a cavity part without a distortion can be modeled easily and efficiently.

BRIEF DESCRIPTION OF THE DRAWINGS It is a typical schematic block diagram of the manufacturing system which manufactures the laminate-molded article of this invention. It is a schematic sectional drawing of the auxiliary member which shows the shape of an auxiliary member. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is a schematic sectional drawing of the laminate-molded article which concerns on a reference example. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of the laminate-molded article which concerns on other embodiment. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of the laminate-molded article which concerns on other embodiment. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of the laminate-molded article which concerns on other embodiment. It is a schematic sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of the laminate-molded article which concerns on other embodiment. 6(a) to 6(d) are schematic cross-sectional views of auxiliary members having cavities of other shapes. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a manufacturing system for manufacturing a laminate-molded article of the present invention.
A manufacturing system 100 having this configuration includes a laminate molding apparatus 11 and a controller 15 that performs integrated control of the laminate molding apparatus 11 .

The layered manufacturing apparatus 11 includes a welding robot 19 having a torch 17 on its tip axis, and a filler material supply section 21 that supplies a filler material (welding wire) M to the torch 17 .

The controller 15 has a CAD/CAM section 31, a trajectory calculation section 33, a storage section 35, and a control section 37 to which these are connected.

The welding robot 19 is an articulated robot, and is supported by a torch 17 provided on the tip shaft so that the filler material M can be continuously supplied. The position and posture of the torch 17 can be arbitrarily set three-dimensionally within the range of degrees of freedom of the robot arm.

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

For example, in the case of the consumable electrode type, a contact tip is arranged inside the shield nozzle, and the contact tip holds the filler material M to which the melting current is supplied. The torch 17 holds the filler material M and generates an arc from the tip of the filler material M in a shield gas atmosphere. The melt material M is fed from the melt material supply unit 21 to the torch 17 by a delivery mechanism (not shown) attached to a robot arm or the like. When the continuously fed filler material M is melted and solidified while the torch 17 is moved, a linear welding bead B, which is a melted and solidified body of the filler material M, is formed on the base plate 10 .

The heat source for melting the filler material M is not limited to the arc described above. For example, a heat source using other methods such as a heating method using both an arc and a laser, a heating method using plasma, a heating method using an electron beam or a laser, or the like may be employed. When heating with an electron beam or laser, the amount of heating can be more finely controlled, the state of the welding bead can be maintained more appropriately, and the quality of the laminated structure can be further improved.

The CAD/CAM unit 31 creates shape data of a layered product to be manufactured, divides it into a plurality of layers, and generates layer shape data representing the shape of each layer. The trajectory calculator 33 obtains the movement trajectory of the torch 17 based on the generated layer shape data. The storage unit 35 stores data such as the generated layer shape data and the movement trajectory of the torch 17 .

The control unit 37 drives the welding robot 19 by executing a drive program based on the layer shape data stored in the storage unit 35 and the movement locus of the torch 17 .

The control unit 37 drives the welding robot 19 by executing a drive program based on the layer shape data stored in the storage unit 35 and the movement locus of the torch 17 . 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 according to the command from the controller 15 .

The manufacturing system 100 configured as described above melts the filler material M while moving the torch 17 by driving the welding robot 19 along the movement trajectory of the torch 17 generated from the set layer shape data. A filler material M is fed onto the base plate 10 . As a result, for example, a laminate-molded article W is formed in which a plurality of linear welding beads B are horizontally laminated on the horizontally arranged base plate 10 .

FIG. 1 shows how a laminate-molded product W in which a plurality of cavities C are formed along the horizontal direction is formed by laminating a plurality of welding beads B on a base plate 10 made of a steel plate placed horizontally. ing. This cavity portion C is used, for example, as a channel or the like through which a fluid is passed. Specifically, when the laminate-molded article W is used as a rotor of a mixer, a pump, or the like, a cooling medium such as cooling water is caused to flow through the cavity portion C. As shown in FIG. Then, the laminate-molded article W is cooled by the cooling medium flowing into the cavity portion C. As shown in FIG.

By the way, when a laminate-molded article W having a cavity C is formed by lamination molding, if a weld bead B is formed around the cavity C, the weld bead B around the cavity C will sag under the influence of gravity. may occur. Therefore, the shape of the cavity C to be formed is easily distorted.

For this reason, in this embodiment, in order to form the laminate-molded article W having the cavity C without distortion, the laminate-molded article W is manufactured as follows using auxiliary members.
FIG. 2 is a schematic cross-sectional view of an auxiliary member showing the shape of the auxiliary member.

As shown in FIG. 2, the auxiliary member 50 used in forming the laminate-molded article W includes a main body portion 53 formed in a hollow cylindrical shape having a cavity portion C, and a portion of the main body portion 53 in the circumferential direction. , there is a joint protrusion 55 formed in the longitudinal direction. The auxiliary member 50 is made of, for example, metal such as steel or copper, and the joining protrusion 55 is integrally formed with the main body 53 . The auxiliary member 50 has a cylindrical main body 53 with a hollow portion C, and a welding bead made by melting and solidifying a filler material or metal powder. be. When using the hollow portion C as a flow path for a cooling medium, it is preferable to use the auxiliary member 50 made of copper, which has excellent thermal conductivity.

A body portion 53 of the auxiliary member 50 is formed to have an annular cross section. In addition, the joint convex portion 55 has a tapered shape that narrows as it separates from the main body portion 53 in a cross-sectional view. The joint protrusion 55 has an angle α formed by both side surfaces 57 of 40° to 90°.

Next, a manufacturing procedure using the auxiliary member 50 will be described.
3A to 3E are schematic cross-sectional views of a laminate-molded article in the process of manufacturing, showing the manufacturing procedure of the laminate-molded article.

As shown in FIG. 3A , the welding robot 19 drives the torch 17 of the additive manufacturing apparatus 11 along the moving trajectory of the torch 17 generated from the set layer shape data with respect to the horizontally installed base plate 10 . While being moved, the filler material M is melted to form a welding bead B on the base plate 10 . Then, the welding beads B are laminated to form the laminated portion W1 (forming step).

As shown in FIG. 3B, the auxiliary member 50 is supported on the laminated portion W1 composed of the welding bead B formed on the base plate 10. As shown in FIG. At this time, the auxiliary member 50 is supported so that the joint convex portion 55 faces downward toward the laminated portion W1 (installation step). Then, the joint convex portion 55 is brought into contact with the upper surface of the laminated portion W1.

In this way, between the installation surface W1s, which is the upper surface of the laminated portion W1, and both side surfaces 57 of the joint convex portion 55 of the auxiliary member 50, a bevel portion K, which is the corner between the side surface 57 and the installation surface W1s, is provided. is formed. At this time, the angle α formed by both side surfaces 57 of the joint protrusion 55 is set to 40° to 90°. As a result, the groove angle β of the groove portion K is 45° to 70°.

Here, for example, in a welded joint such as a T-joint, the groove angle is set to 45° to 70°. This angle is a size that ensures that the bead melts into the groove. For example, if the groove angle is between 0° and 45°, the groove becomes too deep and the width of the opening of the groove becomes small, so that the bead is not formed all the way to the bottom, and non-welding tends to occur. Further, when the groove angle is 70° to 90°, the depth of the groove becomes too shallow and the width of the opening of the groove becomes large, making it impossible to secure a sufficient throat thickness.

For this reason, in this example, the groove angle β of the groove portion K formed by the corners of the both side surfaces 57 of the joint convex portion 55 of the auxiliary member 50 and the installation surface W1s is the groove angle β that enables good bonding. The angle α formed by both side surfaces 57 of the joint protrusion 55 of the auxiliary member 50 is set to 40° to 90° so that the angle ranges from 45° to 70°.

As shown in FIG. 3C, a welding bead B is formed and laminated around the auxiliary member 50 (reshaping step). At this time, the welding bead B is filled in the groove portion K formed between the laminated portion W1 and both side surfaces 57 of the joint convex portion 55 of the auxiliary member 50 supported on the laminated portion W1 (see FIG. 3C). In this way, the groove portion K is filled with the welding bead B, and the auxiliary member 50 is joined to the laminated portion W1.

As shown in FIG. 3D, a weld bead B is further formed and laminated around the auxiliary member 50 . As a result, as shown in FIG. 3E, the auxiliary member 50 having the cavity C is embedded, and the laminate-molded article W having the cavity C is obtained.

As described above, according to the method for manufacturing a laminate-molded article and the laminate-molded article according to the present embodiment, the welding beads B are laminated to form the laminate part W1, and the auxiliary member 50 is installed on the laminate part W1. After that, the welding bead B is laminated on the laminated portion W1 on which the auxiliary member 50 is installed. As a result, the laminate-molded article W having the hollow portion C formed in the auxiliary member 50 can be easily manufactured. That is, it is possible to easily and efficiently form the laminate-molded article W having the cavity C without distortion.

Here, a reference example will be described.
FIG. 4 is a schematic cross-sectional view of a laminate-molded article according to a reference example.
As shown in FIG. 4, in the laminate-molded article WA according to the reference example, an auxiliary member 50A made of an annular cylindrical pipe member having a hollow portion C with a circular cross section is embedded. In this laminate-molded article WA, a narrow gap G is formed between the auxiliary member 50A and the upper surface of the laminated part W1 when the auxiliary member 50A is embedded. As a result, the filler material M of the torch 17 does not enter the narrow gap G, and the welding bead B is not filled in the lower part of the auxiliary member 50A, resulting in poor penetration.

On the other hand, according to the method for manufacturing a layered product and the layered product according to the present embodiment, when the welding bead B is layered on the layered portion W1 in which the auxiliary member 50 is installed, the layered portion W1 and the auxiliary member 50 The welding bead B is filled in the beveled portion K formed by the corners of the joining convex portion 55 to join the auxiliary member 50 to the laminated portion W1. Therefore, it is possible to suppress the occurrence of unwelded portions around the auxiliary member 50, and to manufacture the laminate-molded article W in which the auxiliary member 50 is satisfactorily joined.

Moreover, the angle α formed by both side surfaces 57 forming the joint protrusion 55 of the auxiliary member 50 is set to 40° to 90°. Therefore, by installing the auxiliary member 50 with the joining convex portion 55 facing the laminated portion W1, for example, the gap at the groove portion K between the installation surface W1s of the laminated portion W1 and the side surface 57 of the joining convex portion 55 can be reduced. The tip angle β is 45° to 70°, which is an angle suitable for joining by welding. As a result, it is possible to further suppress the occurrence of unwelded portions around the auxiliary members 50, and to manufacture the laminate-molded article W in which the auxiliary members 50 are satisfactorily joined.

Further, according to this example, by laminating a welding bead obtained by melting and solidifying a filler material or metal powder on the outer periphery of the main body portion 53, the auxiliary member 50 having the joint convex portion 55 can be easily obtained. . Thereby, the productivity of the laminate-molded article W having the cavity portion C can be improved.

Next, a method for manufacturing a laminate-molded article according to another embodiment will be described.
5A to 5D are schematic cross-sectional views of a laminate-molded article in the process of manufacturing, showing the manufacturing procedure of a laminate-molded article according to another embodiment.

As shown in FIG. 5A, in another embodiment, a base W1b is formed when the weld bead B is laminated on the base plate 10 to form the laminated portion W1. These bases W1b are formed at locations where the auxiliary members 50 are installed in the laminated portion W1.

After that, as shown in FIG. 5B, an auxiliary member 50 is supported on each base W1b of the laminated portion W1. Then, a welding bead B is formed in a groove K formed between the installation surface W1s of the base W1b and both side surfaces 57 of the joint protrusion 55, and the groove K is filled with the welding bead B to form the laminated portion W1. The auxiliary member 50 is joined to the base W1b. At this time, since the auxiliary member 50 is supported on the base W1b, when forming the welding bead B in the groove portion K, a part of the torch 17 is placed on the base W1b, which is the mounting surface W1s of the auxiliary member 50. It can be moved below the plane W1s. That is, the movable range of the torch 17 can be increased by forming the base W1b in the laminated portion W1 and supporting the auxiliary member 50 on the base W1b. Therefore, filling of the welding bead B into the groove portion K can be performed smoothly and satisfactorily.

As shown in FIG. 5C, after the auxiliary member 50 is joined onto the base W1b, the recess between the bases W1b is filled with the welding bead B, and then the auxiliary member 50 is attached as shown in FIG. 5D. A weld bead B is formed around and laminated. By embedding the auxiliary member 50 in this way, a laminate-molded article W having a cavity portion C is obtained (see FIG. 3E).

The auxiliary member 50 having the hollow portion C is not limited to the one in the above-described embodiment, and various members are used depending on the required cross-sectional shape of the hollow portion C and the like.
The auxiliary member 50 having the cavity C will be exemplified below.
6A to 6D are diagrams showing auxiliary members having cavities of other shapes, and FIGS. 6A to 6D are schematic cross-sectional views of the auxiliary members, respectively.

The auxiliary member 50 shown in (a) of FIG. 6 includes a body portion 53 having a hollow portion C that is square in cross section. A joining projection 55 is integrally formed on one side of the body portion 53 .

The auxiliary member 50 shown in (b) of FIG. 6 includes a body portion 53 having a hollow portion C that is semicircular in cross section. A joining protrusion 55 is formed on the body portion 53 on the side opposite to the arc side of the hollow portion C. As shown in FIG.

The auxiliary member 50 shown in (c) of FIG. 6 includes a body portion 53 having a hollow portion C that is rhomboidal in cross section. One acute-angled corner of the main body portion 53 serves as a joint convex portion 55 .

The auxiliary member 50 shown in (d) of FIG. 6 includes a body portion 53 having a hollow portion C that is square in cross section. One corner of the body portion 53 is formed as a joint protrusion 55 .

In each of the auxiliary members 50 shown in FIGS. 6(a) to 6(d), the angle α formed by both side surfaces 57 of the joint convex portion 55 is 40° to 90°.

As described above, the present invention is not limited to the above-described embodiments, and those skilled in the art can make modifications and applications by combining each configuration of the embodiments with each other, based on the description of the specification and well-known techniques. It is also contemplated by the present invention that it falls within the scope of protection sought.

As described above, this specification discloses the following matters.
(1) A method for manufacturing a laminate-molded article in which a plurality of welding beads obtained by melting and solidifying a filler material are laminated to form a molded article having a hollow portion,
a modeling step of laminating the welding beads to form a laminated portion;
an installation step of installing an auxiliary member having a joint projection protruding from the outer periphery of the body portion in which the hollow portion is formed, with the joint projection directed toward the laminated portion;
a reshaping step of laminating the welding bead on the lamination portion where the auxiliary member is installed;
including
In the reshaping step, the auxiliary member is joined to the laminated portion by filling a corner portion between the laminated portion and the joint convex portion of the auxiliary member with the welding bead.
A method for producing a laminate-molded article.

According to the method for manufacturing a layered product having the above configuration (1), the welding beads are layered to form the layered portion, the auxiliary member is installed on the layered portion, and then the auxiliary member is welded to the layered portion where the auxiliary member is installed. Laminate the beads. Thereby, it is possible to easily manufacture a laminate-molded article having a hollow portion formed in the auxiliary member. That is, it is possible to easily and efficiently form a modeled object having a hollow portion without distortion.
Moreover, when the welding beads are stacked on the laminated portion on which the auxiliary member is installed, the welding bead is filled in the corners of the laminated portion and the joint convex portion of the auxiliary member to join the auxiliary member to the laminated portion. Therefore, for example, compared to the case where a simple-shaped auxiliary member such as a cylinder is placed in the laminated portion and buried with a welding bead, it is possible to suppress the occurrence of an unwelded portion around the auxiliary member, and the auxiliary member can be used satisfactorily. Bonded laminates can be produced.

(2) The joint protrusion has a tapered cross-sectional shape that tapers away from the main body when viewed in cross section, and the angle formed by both side surfaces forming the joint protrusion is 40° to 90°. ing,
(1) The method for producing a laminate-molded article.

According to the method for manufacturing a laminate-molded article having the above configuration (2), the angle formed by both side surfaces forming the joint protrusion is 40° to 90°. Therefore, by installing the auxiliary member with the joining convex part facing the laminated part, for example, the groove angle at the corner between the installation surface of the laminated part consisting of a plane and the side surface of the joining convex part is suitable for joining by welding. The angle is 45° to 70°. As a result, it is possible to further suppress the occurrence of unwelded portions around the auxiliary member, and to manufacture a laminate-molded article in which the auxiliary member is satisfactorily joined.

(3) forming a base on which the auxiliary member is installed in the laminated portion in the molding step;
In the installation step, the auxiliary member is installed on the base of the laminated portion.
(1) or the manufacturing method of the laminate-molded article as described in (2).

According to the method for manufacturing a laminate-molded article having the configuration of (3) above, the base is formed in the laminated portion, and the auxiliary member is installed on the base. As a result, when the auxiliary member is joined by filling the welding bead in the corner between the laminated portion and the joining convex portion of the auxiliary member, for example, interference of the torch forming the welding bead with the laminated portion can be suppressed. can. In other words, the movable range of the torch can be increased, and the welding bead can be smoothly and satisfactorily filled into the corner between the installation surface and the joining protrusion of the auxiliary member.

(4) A welding bead obtained by melting and solidifying a filler material or metal powder is laminated on the outer periphery of the cylindrical main body portion in which the hollow portion is formed to form the joint convex portion and the auxiliary member. do,
(1) The method for producing a laminate-molded article according to any one of (3).

According to the method for manufacturing a laminate-molded article having the above configuration (4), by laminating the welding bead on the outer periphery of the main body, the auxiliary member having the joining projection can be easily obtained. Thereby, the productivity of the laminate-molded article having the hollow portion can be improved.

(5) A laminate-molded article formed by laminating a plurality of welding beads obtained by melting and solidifying a filler material and having a cavity formed therein,
an auxiliary member having a joint convex portion projecting from the outer periphery of the body portion in which the hollow portion is formed;
a plurality of welding beads laminated around the auxiliary member;
with
The auxiliary member is arranged such that the joint convex portion is oriented in a direction opposite to the lamination direction of the welding bead.
Additive manufacturing.

According to the laminate-molded article having the configuration (5) above, the hollow portion of the auxiliary member can be used, for example, as a flow path for flowing a cooling medium. In addition, the auxiliary member is installed so that the joining convex portion protruding from the outer periphery faces the side opposite to the lamination direction of the welding beads. In other words, when the welding beads are laminated in layers, the auxiliary member is installed with the welding bead facing in the direction opposite to the lamination direction of the welding bead, so that the welding bead is smoothly filled around the welding bead. , a laminate-molded article in which the auxiliary member is well bonded.

(6) The joint protrusion has a tapered cross-sectional shape that tapers away from the main body when viewed in cross section, and the angle formed by both side surfaces forming the joint protrusion is 40° to 90°. ing,
(5) The laminate-molded article according to the above.

According to the laminate-molded product having the configuration of (6) above, when the welding beads are laminated in layers, welding is performed around the joint convex portion in which the angle formed by both side surfaces of the auxiliary member is 40 ° to 90 °. A laminate-molded article in which the beads are filled more smoothly and the auxiliary member is satisfactorily bonded can be obtained.

(7) In the auxiliary member, the joint convex portion is formed by laminating a welding bead obtained by melting and solidifying a filler material or metal powder on the outer periphery of the cylindrical main body portion in which the hollow portion is formed. ing,
(5) or the laminate-molded article according to (6).

According to the laminate-molded article having the above configuration (7), the auxiliary member is used in which the joining projection is easily formed by laminating the welding bead on the outer periphery of the main body. Thereby, it is possible to obtain a laminate-molded article having a hollow portion and having high productivity.

50 Auxiliary member 53 Main body 55 Joint projection 57 Side B Welding bead C Cavity M Solder material W Laminated product W1 Laminated part W1b Base

Claims (7)

A method for manufacturing a laminate-molded article in which a plurality of welding beads obtained by melting and solidifying a filler material are laminated to form a molded article having a cavity,
a modeling step of laminating the welding beads to form a laminated portion;
an installation step of installing an auxiliary member having a joint projection protruding from the outer periphery of the body portion in which the hollow portion is formed, with the joint projection directed toward the laminated portion;
a reshaping step of laminating the welding bead on the lamination portion where the auxiliary member is installed;
including
In the reshaping step, the auxiliary member is joined to the laminated portion by filling a corner portion between the laminated portion and the joint convex portion of the auxiliary member with the welding bead.
A method for producing a laminate-molded article. The joint protrusion has a tapered cross-sectional shape that tapers away from the main body in a cross-sectional view, and the angle formed by both side surfaces forming the joint protrusion is 40° to 90°.
The manufacturing method of the laminate-molded article according to claim 1 . In the molding step, a base for installing the auxiliary member is formed in the laminated portion,
In the installation step, the auxiliary member is installed on the base of the laminated portion.
The manufacturing method of the laminate-molded article according to claim 1 or 2. A welding bead obtained by melting and solidifying a filler material or metal powder is laminated on the outer circumference of the cylindrical main body portion in which the cavity portion is formed to form the joining convex portion to form the auxiliary member.
The method for producing a laminate-molded article according to any one of claims 1 to 3. A laminate-molded product in which a plurality of welding beads obtained by melting and solidifying a filler material are laminated and molded, and a cavity is formed inside,
an auxiliary member having a joint convex portion projecting from the outer periphery of the body portion in which the hollow portion is formed;
a plurality of welding beads laminated around the auxiliary member;
with
The auxiliary member is arranged such that the joint convex portion is oriented in a direction opposite to the lamination direction of the welding bead.
Additive manufacturing. The joint protrusion has a tapered cross-sectional shape that tapers away from the main body in a cross-sectional view, and the angle formed by both side surfaces forming the joint protrusion is 40° to 90°.
The laminate-molded article according to claim 5 . In the auxiliary member, the joint convex portion is formed by laminating a welding bead obtained by melting and solidifying a filler material or metal powder on the outer periphery of the cylindrical main body portion in which the hollow portion is formed.
The laminate-molded article according to claim 5 or 6.

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