Welding condition setting device, welding condition setting method, and program

Abstract

To provide a technology which sets welding conditions for producing a thin structure and a structure having a shape having a varying inclination or angle by additive processes.SOLUTION: A welding condition setting device sets welding conditions when a molding object is produced by additive processes in a WAAM method. The welding condition setting device has: means which refers to data base defining a correspondence relationship between a molding width and the welding conditions to calculate the welding conditions corresponding to the molding width of a molding object layer; means which refers to data base defining a correspondence relationship between the welding conditions and a molding height to calculate a molding height of the molding object layer when molding is performed under the calculated welding conditions; and means which sets a width of the molding object in a position corresponding to an end of a molded object when the molding object layer is molded at the calculated molding height as a molding width of the molding object layer to be molded next.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a welding condition setting device, a welding condition setting method, and a program. [Background technology]

[0002] A wire arc additive manufacturing (WAAM) method (additive manufacturing using arc and wire) is available, which builds a desired shape by stacking weld beads formed by melting and solidifying a filler metal. For example, Patent Document 1 (Patent Document 1) discloses a method for creating a 3D shape model of the object from shape data, decomposing the 3D shape model into multiple linear models, and planning welding passes for forming weld beads along the linear models. Patent Document 1 also discloses a manufacturing example in which a single layer is formed by multiple adjacent weld beads and these layers are stacked vertically, as well as a manufacturing example in which the torch is oriented downward and stacked vertically during manufacturing. Meanwhile, there is a need for additive manufacturing to build thin structures, each layer of which corresponds to the width of one weld bead pass, as well as structures with inclined shapes, shapes with varying angles, overhanging shapes, etc. To meet these needs, it is necessary to appropriately set welding conditions for additive manufacturing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-29198 Summary of the Invention [Problem to be solved by the invention]

[0004] A method for setting welding conditions for additive manufacturing of thin-walled structures and structures with shapes that vary in slope or angle is provided.

[0005] The present disclosure provides a welding condition setting device, a welding condition setting method, and a program that can solve the above-mentioned problems. [Means for solving the problem]

[0006] The welding condition setting device according to the present disclosure is a welding condition setting device that sets welding conditions when additively manufacturing an object using the WAAM method, and includes: means for calculating welding conditions corresponding to the width of the layer to be manufactured by referring to a database that defines the correspondence between the manufacturing width and the welding conditions; means for calculating the manufacturing height of the layer to be manufactured when manufactured under the calculated welding conditions by referring to a database that defines the correspondence between the welding conditions and the manufacturing height; and means for setting the width of the object to be manufactured at a position corresponding to the edge of the object that will be created when the layer to be manufactured is manufactured at the calculated manufacturing height as the manufacturing width of the layer to be manufactured next.

[0007] The welding condition setting method according to the present disclosure is a welding condition setting method for setting welding conditions when additively manufacturing an object to be manufactured using the WAAM method, and includes the steps of: calculating welding conditions corresponding to the manufacturing width of the layer to be manufactured by referring to a database that defines the correspondence between the manufacturing width and the welding conditions; calculating the manufacturing height of the layer to be manufactured when manufactured using the calculated welding conditions by referring to a database that defines the correspondence between the welding conditions and the manufacturing height; and setting the width of the object to be manufactured at a position corresponding to the edge of the object that will be created when the layer to be manufactured is manufactured at the calculated manufacturing height as the manufacturing width of the layer to be manufactured next.

[0008] The program according to the present disclosure causes a computer to execute a process for setting welding conditions when additively manufacturing an object to be manufactured using the WAAM method, the process comprising the steps of: calculating welding conditions corresponding to the manufacturing width of the layer to be manufactured by referring to a database that defines the correspondence between the manufacturing width and the welding conditions; calculating the manufacturing height of the layer to be manufactured when manufactured using the calculated welding conditions by referring to a database that defines the correspondence between the welding conditions and the manufacturing height; and setting the width of the object to be manufactured at a position corresponding to the edge of the object that will be created when the layer to be manufactured is manufactured at the calculated manufacturing height as the manufacturing width of the layer to be manufactured next. [Effects of the Invention]

[0009] The welding condition setting device, welding condition setting method, and program disclosed herein enable additive manufacturing of thin-walled structures and structures having shapes with varying inclinations or angles. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram illustrating an example of an additive manufacturing system according to an embodiment. [Figure 2] 1A to 1C are diagrams illustrating an additive manufacturing method according to an embodiment. [Figure 3] FIG. 4 is a diagram showing an example of an algorithm for setting welding conditions according to the embodiment. [Figure 4] FIG. 2 is a diagram illustrating an example of a database according to the embodiment. [Figure 5] FIG. 10 is a diagram illustrating the setting of a torch angle according to the embodiment. [Figure 6] 10A and 10B are diagrams illustrating offset setting of a torch position according to an embodiment. [Figure 7] 4 is a flowchart illustrating an example of a welding condition setting process according to the embodiment. [Figure 8] FIG. 2 illustrates an example of a hardware configuration of a control device according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] <Embodiment> Hereinafter, a method for setting welding conditions in the WAAM-based additive manufacturing of the present disclosure will be described with reference to the drawings. (composition) FIG. 1 is a block diagram illustrating an example of an additive manufacturing system according to an embodiment. The additive manufacturing system 100 includes a welding system 1 and a control device 10. The welding system 1 includes a welding robot 2, a welding machine 3, a wire feeder 4, a torch 5, and the like. The welding system 1 performs additive manufacturing using the WAAM method based on instructions from the control device 10, and forms a structure 6 on a positioning device 7. The welding system 1 performs the manufacturing process using short-circuit transfer MIG welding. Short-circuit transfer MIG welding is characterized by low heat input (low molten pool temperature) and high viscosity of the weld bead. By using short-circuit transfer MIG welding, deformation of the weld bead due to gravity can be ignored even when the torch 5 is positioned not only vertically downward but also diagonally or sideways (horizontally). This allows the desired shape of the structure to be formed in the same way as when the torch 5 is positioned downward. The control device 10 includes a shape data acquisition unit 11, a welding condition setting unit 12, a control unit 13, and a memory unit 14. In the configuration example of FIG. 1, control device 10 is provided with welding condition setting unit 12, but welding condition setting unit 12 may be provided as a device separate from control device 10.

[0012] The shape data acquisition unit 11 acquires shape data of the object to be formed. The shape data is, for example, a three-dimensional model (CAD data) that represents the shape of the object to be formed. From the shape data, the width, size, etc. of the object to be formed at any position can be calculated. The welding condition setting unit 12 sets welding conditions such as welding speed, voltage, current, wire feed rate, head movement amount, torch angle, etc. The control unit 13 controls the welding system 1 based on the welding conditions set by the welding condition setting unit 12, and performs WAAM-type additive manufacturing using short-circuit transfer MIG welding. Storage unit 14 stores the shape data acquired by shape data acquisition unit 11, the welding conditions set by welding condition setting unit 12, a database (described later) used to calculate the welding conditions, and the like.

[0013] Next, with reference to FIG. 2, the additive manufacturing method according to this embodiment will be described. A part 20 shown in the left diagram of FIG. 2 is an example of an object to be manufactured. A molded object 21 shown in the right diagram is a schematic diagram of an object manufactured by additive manufacturing of the part 20. The molded object 21 is constructed by stacking rectangular blocks. The bottom block 26 is called the first layer, the block 27 above it is called the second layer, and so on. One block represents the molded portion manufactured by one welding (one pass). The horizontal length of the block is called the mold width, and the vertical length (thickness) of the block is called the mold height. The molded object 21 is constructed by stacking blocks in layers, with each layer consisting of only one block. This type of configuration is called a one-pass configuration. For example, a thin-walled structure would have a one-pass configuration. In contrast, when additively manufacturing thick structures, multiple welding processes are required for each layer to achieve the desired thickness, meaning that each layer is made up of multiple blocks (multiple passes) in the horizontal direction.

[0014] In the case of a multi-pass structure, the final build width can be adjusted to the target width by adjusting the welding conditions during the multiple welding passes performed to form one layer. In contrast, when additively manufacturing a single-pass structure, the build width required by the shape data must be achieved with a single welding pass for each layer. To control the build width, the welding conditions must be appropriately set. In other words, the build width can be changed by changing the welding conditions. Therefore, in this embodiment, the width of the object to be built at a position corresponding to the block of each layer is acquired by referring to the shape data, and the acquired width is set as the build width. The object indicated by the shape data is then built by performing short-circuit transfer MIG welding, with welding conditions set according to the set build width. For example, the current, voltage, and wire feed rate are kept constant to maintain a constant amount of melted wire, and the build width is changed by changing the speed at which the torch 5 is moved during building. In the case of the object 21 illustrated in FIG. 2, the object 21 can be built by setting the welding conditions (current, voltage, and wire feed rate) constant and adjusting the welding speed according to the build width.

[0015] FIG. 3 shows an example of an algorithm for setting welding conditions according to an embodiment. The welding conditions for the Nth layer are determined by the build width of the Nth layer. Therefore, first, a portion of the object to be built corresponding to the block of the Nth layer is identified based on the shape data, and the width of that portion is calculated from the shape data. For example, if the block of the Nth layer is block 28 in FIG. 2, the length indicated by arrow 29 on part 20 becomes the width of the object to be built. The calculated width is then set as the build width of the Nth layer. Once the build width is set, the welding conditions for building with that build width are calculated. For example, a database that defines the correspondence between the build width and the welding conditions is prepared, and the welding conditions corresponding to the build width of the Nth layer are acquired by referring to this database. Furthermore, when welding is performed under certain welding conditions, the build height is determined in the same way as the build width is determined. For example, a database that defines the correspondence between the build height and the welding conditions (or a database that defines the correspondence between the build height and the build width) is prepared, and the build height of the Nth layer when welding is performed under the welding conditions corresponding to the build width of the Nth layer is calculated by referring to this database. Once the build height for the Nth layer has been calculated, the shape data is referenced to obtain the width of the object to be built at a position corresponding to the sum of the build heights of the layers up to the Nth layer. The position corresponding to the sum of the build heights is not a position vertically elevated from the bottom of the object by the sum of the build heights, but a position along the shape of the object from the end of the bottom side of the object toward the other end of the object by the sum of the build heights. The width obtained from the shape data becomes the build width for the N+1th layer. As in the case of the Nth layer, the database is referenced to determine the welding conditions corresponding to the build width for the N+1th layer, and the build height for the N+1th layer is calculated from the welding conditions. The same process is repeated thereafter to set the welding conditions for each layer. This process is repeated until the block for the N+kth layer reaches the other end of the object.

[0016] FIG. 4 shows an example of a database that defines the correspondence between build widths and welding conditions, and another example of a database that defines the correspondence between build heights and welding conditions. The vertical axis of FIG. 4 represents build widths or build heights, and the horizontal axis represents welding speeds. Line 41 is an example of a database that defines the correspondence between build widths and welding conditions. Line 42 is an example of a database that defines the correspondence between build heights and welding conditions. For example, when the build width of the Nth layer is X1 (mm), the welding condition setting unit 12 calculates the welding speed X2 (m / min) for the Nth layer by referring to line 41 stored in the memory unit 14. The welding condition setting unit 12 also calculates the build height X3 (mm) for the Nth layer that corresponds to the welding speed X2 (m / min) for the Nth layer by referring to line 42 stored in the memory unit 14. In the above explanation, only the welding speed is changed depending on the build width, but it is also possible to prepare similar databases for other welding conditions, such as a database that specifies the correspondence between current and voltage and build width, and a database that specifies the correspondence between current and voltage and build height, and to calculate values ​​corresponding to the build width for welding conditions other than the welding speed by referring to these databases.

[0017] Next, we will explain how to set the torch angle, one of the welding conditions. When using MIG welding with short-circuit transfer, the angle of the torch 5 can be changed from horizontal to vertical, allowing blocks to be stacked in the direction of the torch angle. For example, to form the part surrounded by circle 22 in Figure 2, the direction of the torch 5 is set in the direction indicated by arrow 24. To form the part surrounded by circle 23, the direction of the torch 5 is set in the direction indicated by arrow 25. By tilting the torch angle during printing, it is possible to form an object 21 with a tilted shape.

[0018] The welding conditions (welding speed, torch angle) are set based on the width and orientation of the object to be formed, and after forming, the width and orientation of the object to be formed for the next layer are determined based on the height of the object to be formed. By repeating this process of setting the next welding conditions based on the determined width and orientation of the object, the width of the object to be formed changes, as in object 21, making it possible to form an object with an inclined shape.

[0019] Next, we will explain the creation of a shape with a constant build width and variable orientation (angle) with reference to Figure 5. When the build width is constant, the welding speed is constant. The object to be built is divided into multiple blocks based on the build height, which is determined by the welding speed, and each block is built in one pass. The torch angle is then changed based on the block angle for each layer. The build direction of the object (block tilt) and the torch angle coincide. Graph 51 on the left side of Figure 5 shows the change in torch angle. The vertical axis of graph 51 represents the torch angle, and the horizontal axis represents the layer. A torch angle of 0 degrees represents the angle when the tip of the torch 5 is pointing vertically downward. As the direction of the tip of the torch 5 changes clockwise from 0 degrees, the torch angle is the angle at which the angle between the vertical axis and the torch 5 increases. As shown in graph 51, the torch angle is 0 degrees from layer 0 to T1, and increases at a constant rate from layer T1 to T2. The torch angle from layer T2 to layer T3 is 90 degrees. An example of a molded object resulting from additive manufacturing while maintaining constant welding speed, current, voltage, and wire feed rate and varying the torch angle as shown in graph 51 is shown in graph 52 on the right side of Figure 5. Object 53 is a structure created by moving torch 5 in the front-to-back direction of the page and layering it one layer at a time. As shown in the figure, object 53 has a shape resembling a portion of a cylindrical cross section. As shown in Figure 5, by finely adjusting the torch angle depending on the shape of the object, it is possible to create structures with varying angles. Similarly, by changing the torch angle to match the shape of the object to be molded, it is possible to create an overhanging structure.

[0020] Next, we will explain how to set the head movement amount, which is one of the welding conditions. For example, to form the part surrounded by circle 22 in Fig. 2, the position of the head that holds torch 5 is shifted to the right side of the paper, layer by layer. The welding condition setting unit 12 calculates the center position in the left-right direction of the paper of the position corresponding to each layer in the object to be formed based on the shape data, and moves the head to the calculated position, thereby forming an inclined shape.

[0021] Next, the fabrication of a tapered object will be described with reference to FIG. 6 . A part 60 shown in the left diagram of FIG. 6 is an example of an object having a tapered shape. Graph 61 in the right diagram of FIG. 6 shows the build width and offset amount according to the height direction of the part 60. The vertical axis of graph 61 indicates the build width or offset amount, and the horizontal axis indicates the height (layers). As already explained, the build width can be changed by changing the welding speed. To build the part 60, it is necessary to increase the build width while offsetting the torch 5 to the left of the paper so that the right side surface 64 of the part 60 is vertical. Line 62 indicates the build width according to the height (number of layers) of the part 60, and line 63 indicates the offset amount of the head holding the torch 5 according to the height (number of layers) of the part 60. For example, based on the shape data of the part 60, the welding condition setting unit 12 calculates the center position in the left-right direction of the paper of the positions corresponding to each layer of the part 60, and calculates the welding speed according to the build width of the positions corresponding to each layer of the part 60. Then, the difference between the center position of the (N-1)th layer and the center position of the Nth layer is calculated as the offset amount for forming the Nth layer. Line 62 represents the offset amount for each layer calculated in this manner. By controlling welding system 1 based on the calculated offset amount and welding speed, control unit 13 can form an object having a tapered shape such as part 60.

[0022] (operation) Next, the flow of the method for setting welding conditions according to this embodiment will be described. FIG. 7 is a flowchart showing an example of a welding condition setting process according to the embodiment. The shape data acquisition unit 11 acquires shape data of the object to be formed (step S11). For example, the shape data is shape data of a thin-walled structure having one pass. Next, the welding condition setting unit 12 sets 1 to a variable N representing the object for which the welding conditions are to be set (step S12). Next, the welding condition setting unit 12 calculates the build width of the Nth layer (step S13). For example, when N=1, the welding condition setting unit 12 refers to the shape data and calculates the width of the bottom surface of the object to be formed as the build width. When N>1, the welding condition setting unit 12 calculates the sum of the build heights up to the (N-1)th layer, and calculates the width of the object to be formed at a position corresponding to the sum of the build heights in the shape data as the build width. Next, the welding condition setting unit 12 calculates the welding conditions for the Nth layer (step S14). For example, the welding condition setting unit 12 calculates the welding speed for the Nth layer by referring to a database that defines the correspondence between the build width and the welding speed, as shown in FIG. 4. Furthermore, for example, the welding condition setting unit 12 calculates the inclination angle of the object to be formed at a height position corresponding to the Nth layer in the shape data, and sets a torch angle such that the torch 5 is inclined by the calculated angle. The inclination angle of the object to be formed can be obtained by calculating the angle between a horizontal plane and a line connecting the center positions of the object at each height. Furthermore, for example, the welding condition setting unit 12 calculates the coordinates of the horizontal center of the object to be formed at height positions corresponding to the Nth layer and the (N-1)th layer in the shape data, and sets the difference between the coordinates of the Nth layer and the coordinates of the (N-1)th layer as the horizontal offset amount of the head.

[0023] Next, the welding condition setting unit 12 calculates the build height of the Nth layer (step S15). For example, the welding condition setting unit 12 calculates the build height of the Nth layer by referring to a database that defines the correspondence between the build height and the welding speed, as illustrated in FIG. 4. The welding condition setting unit 12 sets the build height of the Nth layer as the vertical offset amount of the head. Next, the welding condition setting unit 12 determines whether the setting of the build conditions is complete (step S16). If the block of the Nth layer reaches the end of the object opposite to the bottom side when the blocks from the first layer to the Nth layer are stacked along the shape of the object, the welding condition setting unit 12 determines that the setting of the welding conditions is complete; otherwise, the welding condition setting unit 12 determines that the setting of the welding conditions is incomplete. If it is determined that the setting is complete (step S16; Yes), the processing of FIG. 7 is completed. The welding condition setting unit 12 records the set welding conditions for each layer (welding speed, torch angle, head position, etc.) in the storage unit 14. The control unit 13 reads out the welding conditions for each layer recorded in the memory unit 14 and controls the welding system 1 to perform additive manufacturing using short-circuit transfer MIG welding. If it is determined that the process is not complete (step S16; No), the welding condition setting unit 12 adds 1 to the variable N (step S17) and repeats the process from step S13.

[0024] (effect) As described above, according to the method for setting welding conditions of this embodiment, it is possible to additively manufacture thin-walled structures and structures having shapes with varying inclinations or angles.

[0025] 8 is a diagram showing an example of the hardware configuration of the control device 10 according to the embodiment. The computer 900 includes a CPU 901, a main storage device 902, an auxiliary storage device 903, an input / output interface 904, and a communication interface 905. The control device 10 described above is implemented in the computer 900. The above-described functions are stored in the auxiliary storage device 903 in the form of a program. The CPU 901 reads the program from the auxiliary storage device 903, loads it into the main storage device 902, and executes the above-described processing in accordance with the program. The CPU 901 also allocates a storage area in the main storage device 902 in accordance with the program. The CPU 901 also allocates a storage area in the auxiliary storage device 903 for storing data being processed in accordance with the program.

[0026] A program for implementing all or part of the functions of the control device 10 may be recorded on a computer-readable recording medium, and the program may be loaded into a computer system and executed to perform processing by each functional unit. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. Furthermore, if a WWW system is used, the term "computer system" also includes a homepage provision environment (or display environment). Furthermore, the term "computer-readable recording medium" refers to portable media such as CDs, DVDs, and USBs, as well as storage devices such as hard disks built into the computer system. Furthermore, if the program is distributed to the computer 900 via a communication line, the computer 900 that receives the program may load the program into the main storage device 902 and execute the above-described processing. Furthermore, the program may be for implementing part of the above-described functions, or may be capable of implementing the above-described functions in combination with a program already stored in the computer system.

[0027] As described above, several embodiments according to the present disclosure have been described, but all of these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents as defined in the claims, as well as in the scope and spirit of the invention.

[0028] <Additional Notes> The welding condition setting device, welding condition setting method, and program described in the embodiments can be understood, for example, as follows.

[0029] (1) The welding condition setting device (control device 10) according to the first aspect is a welding condition setting device that sets welding conditions when additively manufacturing an object to be manufactured using the WAAM method, and includes: a means (welding condition setting unit 12) for calculating welding conditions corresponding to the width of the layer to be manufactured by referring to a database (line 41 in FIG. 4) that defines the correspondence between the manufacturing width and the welding conditions; a means (welding condition setting unit 12) for calculating the manufacturing height of the layer to be manufactured when manufactured using the calculated welding conditions by referring to a database (line 42 in FIG. 4) that defines the correspondence between the welding conditions and the manufacturing height; and a means (welding condition setting unit 12) for setting the width of the object to be manufactured at a position corresponding to the edge of the object that will be created when the layer to be manufactured is manufactured at the calculated manufacturing height as the manufacturing width of the layer to be manufactured next. This makes it possible to set welding conditions for additive manufacturing of thin-walled structures or structures with shapes that change in slope or angle.

[0030] (2) A welding condition setting device according to a second aspect is the welding condition setting device of (1), further comprising a means (welding condition setting unit 12) for repeatedly executing the process of calculating the welding conditions corresponding to the build width of the layer to be built by the means for calculating the welding conditions, calculating the build height of the layer to be built by the means for calculating the build height, and setting the build width of the layer to be built next by the means for setting the build width, until the building of the object to be built is completed. This allows the welding conditions to be set for each layer from the start to the end of the build.

[0031] (3) A welding condition setting device according to a third aspect is the welding condition setting device of (1) to (2), wherein the welding condition is any one of current, voltage, wire feed rate, and welding speed. This allows the welding speed for each layer to be set.

[0032] (3') A welding condition setting device according to a third aspect is the welding condition setting device of (1) to (2), wherein the welding conditions are a welding speed when the current, voltage, and wire supply rate are constant. This makes it possible to additively manufacture thin structures and structures with shapes that change in slope or angle.

[0033] (4) A welding condition setting device according to a fourth aspect is a welding condition setting device according to any one of (1) to (3), further comprising a means for calculating the inclination of the object to be formed in the layer to be formed, and calculating the angle at which the torch can be tilted at the same angle as the inclination as the torch angle of the layer to be formed. This makes it possible to layer-manufacture structures with shapes that change in slope or angle.

[0034] (5) A welding condition setting device according to a fifth aspect is a welding condition setting device according to any one of (1) to (4), further comprising a means for calculating a center position in the width direction of the object to be formed in the forming target layer and calculating an offset amount for moving the torch to the center position. This allows for additive manufacturing of a tapered structure.

[0035] (6) A welding condition setting device according to a sixth aspect is a welding condition setting device according to any one of (1) to (5), wherein the WAAM-type additive manufacturing uses short-circuit transfer MIG welding, and the means for calculating the welding conditions calculates the welding conditions based on short-circuit transfer MIG welding. By using short-circuit transfer MIG welding while setting the welding conditions according to the present disclosure, it is possible to additively manufacture thin-walled structures and structures with shapes that vary in slope or angle.

[0036] (7) A welding condition setting device according to a seventh aspect is the welding condition setting device according to any one of (1) to (6), wherein the width of the object to be shaped is a shaping width that can be shaped in one welding operation. By setting the welding conditions according to the present disclosure, structures can be produced with high precision using a single pass.

[0037] (8) A welding condition setting method according to an eighth aspect is a welding condition setting method executed by a computer for setting welding conditions when additively manufacturing an object to be manufactured using the WAAM method, and includes the steps of: calculating welding conditions corresponding to the manufacturing width of the layer to be manufactured by referring to a database that defines the correspondence between the manufacturing width and the welding conditions; calculating the manufacturing height of the layer to be manufactured when manufactured using the calculated welding conditions by referring to a database that defines the correspondence between the welding conditions and the manufacturing height; and setting the width of the object to be manufactured at a position corresponding to the edge of the object to be manufactured when the layer to be manufactured is manufactured at the calculated manufacturing height as the manufacturing width of the layer to be manufactured next.

[0038] (9) A program according to the ninth aspect causes a computer to execute a process for setting welding conditions when additively manufacturing an object to be manufactured using the WAAM method, the process comprising the steps of: calculating welding conditions corresponding to the width of the layer to be manufactured by referring to a database that defines the correspondence between the manufacturing width and the welding conditions; calculating the manufacturing height of the layer to be manufactured using the calculated welding conditions by referring to a database that defines the correspondence between the welding conditions and the manufacturing height; and setting the width of the object to be manufactured at a position corresponding to the edge of the object that will be created when the layer to be manufactured is manufactured at the calculated manufacturing height as the manufacturing width of the layer to be manufactured next. [Explanation of symbols]

[0039] 1. Welding system 2. Welding robot 3. Welding machine 4. Wire feeder 5. Torch 6...modeled object 7. Positioning device 10. Control device 11. Shape data acquisition section 12. Welding condition setting section 13 Control section 14...Storage section 100···Additive Manufacturing System 900···Computer 901 CPU 902...Main memory 903...Auxiliary storage device 904 Input / Output Interface 905···Communication Interface

Claims

1. A welding condition setting device that sets welding conditions when an object is additively manufactured by the WAAM method, a means for calculating the welding conditions corresponding to the build width of the layer to be built by referring to a database that defines the correspondence between the build width and the welding conditions; a means for calculating a build height of the target layer when the layer is built under the calculated welding conditions by referring to a database that defines a correspondence relationship between the welding conditions and the build height; a means for setting, as a modeling width of the next modeling target layer, a width of the modeling target layer at a position corresponding to an edge of the modeling target layer that will be produced when the modeling target layer is modeled at the calculated modeling height; and A welding condition setting device having the same.

2. a means for repeatedly executing the following process until the formation of the object is completed: calculating welding conditions corresponding to the formation width of the object to be formed by the means for calculating welding conditions; calculating the formation height of the object to be formed by the means for calculating the formation height; and setting the formation width of the object to be next formed by the means for setting the formation width; 2. The welding condition setting device according to claim 1, further comprising:

3. The welding condition is any one of current, voltage, wire feed rate, and welding speed.

3. The welding condition setting device according to claim 1 or 2.

4. a means for calculating an inclination of the object to be formed in the layer to be formed, and calculating an angle at which a torch can be inclined at the same angle as the inclination as the inclination, as a torch angle of the layer to be formed; 3. The welding condition setting device according to claim 1, further comprising:

5. a means for calculating a center position in a width direction of the object to be formed in the object layer, and calculating an offset amount for moving a torch to the center position; 3. The welding condition setting device according to claim 1, further comprising:

6. In the WAAM method of additive manufacturing, short-circuit transfer MIG welding is used, The means for calculating the welding conditions calculates the welding conditions assuming short-circuit transfer MIG welding.

3. The welding condition setting device according to claim 1 or 2.

7. The width of the object to be formed is a width that can be formed by one welding.

3. The welding condition setting device according to claim 1 or 2.

8. A welding condition setting method executed by a computer for setting welding conditions when an object is additively manufactured by a WAAM method, comprising: calculating welding conditions corresponding to the build width of the target layer by referring to a database that defines a correspondence relationship between the build width and the welding conditions; calculating a build height of the layer to be built when the layer is built under the calculated welding conditions by referring to a database that defines a correspondence relationship between welding conditions and build heights; setting, as a modeling width of the next modeling target layer, a width of the modeling target layer at a position corresponding to an edge of the model that will be produced when the modeling target layer is modeled at the calculated modeling height; A welding condition setting method having the above-mentioned steps.

9. On the computer, A process for setting welding conditions when additive manufacturing an object to be manufactured by the WAAM method, calculating welding conditions corresponding to the build width of the target layer by referring to a database that defines a correspondence relationship between the build width and the welding conditions; calculating a build height of the layer to be built when the layer is built under the calculated welding conditions by referring to a database that defines a correspondence relationship between welding conditions and build heights; setting, as a modeling width of the next modeling target layer, a width of the modeling target layer at a position corresponding to an edge of the model that will be produced when the modeling target layer is modeled at the calculated modeling height; A program that executes a process having the above steps.

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