JP2024013526A - Control information correction method, control information correction device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control information correction method, control information correction device and program which can suppress a topical deviation of a laminate height to realize a high-quality molding article's molding when molding a molding article by laminate molding.

SOLUTION: A control information correction method includes: a molding information acquisition step for acquiring molding information on the molding route, laminate direction and laminate condition of a weld bead B which forms a bead layer BL; a predicted shape calculation step for calculating a predicted shape of the bead layer BL on the basis of the molding information; a change necessity determination step for determining whether or not the laminate condition needs to be changed on the basis of the predicted shape; and a laminate condition adjustment step for adjusting the laminate condition of the weld bead B for each place when it is determined that the laminate condition needs to be changed, to suppress a dispersion of the laminate height BLh of the bead layer BL.

SELECTED DRAWING: Figure 12

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a control information modification method, a control information modification device, and a program.

In recent years, the need for 3D printers as a means of production has been increasing, and research and development is being carried out in the aircraft industry and the like for practical application, particularly for the application of 3D printers 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 forms a model by layering the molten metal.

Patent Document 1 discloses that when a second weld bead is laminated on a first weld bead, a parameter value for controlling the amount of droplets sent out from a welding torch is calculated based on the amount of deviation from the center line. , a modeling apparatus is disclosed that controls a welding torch and a moving mechanism based on calculated parameter values to suppress errors in the height direction and collapse of a three-dimensional shape.

Japanese Patent Application Publication No. 2015-160217

By the way, in additive manufacturing in which a modeled object is created by stacking weld beads, the modeled object is created based on a trajectory plan designed by slicing the shape of the object represented by three-dimensional CAD data into multiple layers. , the target position set in trajectory planning may deviate from the actual shape.

In this way, if there is a mismatch between the target position of the trajectory plan and the actual shape, the torch may interfere with the object, or the distance between the object and the torch may become too large, causing an arc start error. , there is a risk of hindering the continuation of modeling.

Therefore, the present invention provides a control information modifying method, a control information modifying device, and a program that can suppress local deviations in stack height and realize high-quality modeling when a molded object is manufactured by additive manufacturing. The purpose is to provide.

The present invention consists of the following configuration.
(1) Melt the welding material while moving the torch along the modeling path to form a weld bead on the target surface, and create a three-dimensional shaped object in which the target shape is divided into multiple layers and bead layers are laminated. A control information modification method for modifying control information for controlling an additive manufacturing apparatus, the method comprising:
a shaping information acquisition step of acquiring shaping information regarding a shaping route, a stacking direction, and stacking conditions of the weld bead forming the bead layer;
a predicted shape calculation step of calculating a predicted shape of the bead layer based on the modeling information;
a change necessity determining step of determining whether or not the lamination conditions need to be changed based on the predicted shape;
When it is determined that the lamination conditions need to be changed, a lamination condition adjustment step of adjusting the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer;
including,
Control information modification method.
(2) While moving the torch along the modeling path, the welding material is melted to form a weld bead on the target surface, and the target shape is divided into multiple layers to create a three-dimensional shaped object in which bead layers are laminated. A control information modification device for modifying control information for controlling an additive manufacturing device, the control information modification device comprising:
a shaping information acquisition unit that acquires shaping information regarding a shaping path, a stacking direction, and stacking conditions of the weld bead forming the bead layer;
a predicted shape calculation unit that calculates a predicted shape of the bead layer based on the modeling information;
a change necessity determination unit that determines whether or not the lamination conditions need to be changed based on the predicted shape;
a lamination condition adjustment unit that adjusts the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer when it is determined that the lamination conditions need to be changed;
including,
Control information modification device.
(3) Melt the welding material while moving the torch along the modeling path to form a weld bead on the target surface, and create a three-dimensional shaped object in which the target shape is divided into multiple layers and bead layers are laminated. A program for modifying control information for controlling an additive manufacturing apparatus, the program comprising:
to the computer,
a shaping information acquisition function that acquires shaping information regarding a shaping route, a stacking direction, and stacking conditions of the weld bead forming the bead layer;
a predicted shape calculation function that calculates a predicted shape of the bead layer based on the modeling information;
a change necessity determination function that determines whether or not the lamination conditions need to be changed based on the predicted shape;
a lamination condition adjustment function that adjusts the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer when it is determined that the lamination conditions need to be changed;
In order to realize
program.

According to the present invention, when a modeled object is formed by layered modeling, it is possible to suppress local deviations in the height of the stacked layers and realize the creation of a high-quality modeled object.

FIG. 1 is a schematic diagram showing the overall configuration of an additive manufacturing system. FIG. 2 is a functional block diagram of the control information modification device. FIG. 3 is a flowchart showing a procedure for modifying control information by the control information modifying device. FIG. 4 is an explanatory diagram showing an example of a model that takes into consideration the overlap between adjacent beads. FIG. 5 is an explanatory diagram showing an example of a model that reproduces a shape in which weld metal hangs down to the lower layer side. FIG. 6 is a schematic perspective view of a cylindrical shaped object having a conical shape. FIG. 7 is a schematic diagram showing a predicted shape of a cylindrical object having a conical shape. FIG. 8 is a schematic diagram showing a deviation in the layer height of bead layers that occurs when weld beads are stacked. FIG. 9 is a schematic diagram illustrating the deviation in the layer height of the bead layer. FIG. 10 is a schematic diagram showing the shape of the weld bead forming the first bead layer when lamination conditions are adjusted. FIG. 11 is a schematic diagram showing the layer height of the first bead layer when lamination conditions are adjusted. FIG. 12 is a schematic diagram showing the layer height of each bead layer when lamination conditions are adjusted. FIG. 13 is a schematic diagram showing the layer height of each bead layer when the width of the weld bead is suppressed by adjusting the lamination conditions. FIG. 14 is a schematic diagram showing how to slice the three-dimensional shape of the object.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The additive manufacturing system shown here uses a heat source device to melt filler metal (welding wire) held by a manipulator to form a weld bead, and then repeatedly stacks the formed weld bead into a desired shape to create a weld bead. This is to create a modeled object made up of layers of layers. The control information modification device modifies control information for controlling the layered manufacturing device that creates such a modeled object.

<Configuration of additive manufacturing system>
An example of the configuration of an additive manufacturing system that is operated by control information generated by the control information modification device described above will be described.
FIG. 1 is a schematic diagram showing the overall configuration of an additive manufacturing system.
The additive manufacturing system 100 includes a modeling control device 15, a manipulator 17, a filler material supply device 19, a manipulator control device 21, and a heat source control device 23.

Manipulator control device 21 controls manipulator 17 and heat source control device 23 . A controller (not shown) is connected to the manipulator control device 21, and an operator can instruct any operation of the manipulator control device 21 via the controller.

The manipulator 17 is, for example, a multi-jointed robot, and a torch 11 provided on a tip shaft is supported so that the filler material M can be continuously supplied. The torch 11 holds the filler metal M in a state protruding from its tip. The position and orientation of the torch 11 can be arbitrarily set three-dimensionally within the degree of freedom of the robot arm that constitutes the manipulator 17. The manipulator 17 preferably has six or more degrees of freedom, and is preferably capable of arbitrarily changing the axial direction of the heat source at its tip. The manipulator 17 may be in various forms, such as a multi-joint robot with four or more axes shown in FIG. 1 or a robot with angle adjustment mechanisms on two or more orthogonal axes.

The torch 11 has a shield nozzle (not shown), and shield gas is supplied from the shield nozzle. The shielding gas blocks the atmosphere and prevents oxidation and nitridation of the molten metal during welding, thereby suppressing welding defects. The arc welding method used in this configuration may be either a consumable electrode type such as covered arc welding or carbon dioxide arc welding, or a non-consumable electrode type such as TIG (Tungsten Inert Gas) welding or plasma arc welding. The selection will be made accordingly. Here, gas metal arc welding will be explained as an 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 a current is supplied is held in the contact tip. The torch 11 holds the filler metal M and generates an arc from the tip of the filler metal M in a shielding gas atmosphere.

The filler material supply device 19 supplies the filler material M toward the torch 11 . The filler material supply device 19 includes a reel 19a around which the filler material M is wound, and a feeding mechanism 19b that feeds out the filler material M from the reel 19a. The filler material M is fed to the torch 11 by the feeding mechanism 19b while being fed in the forward or reverse direction as required. The feeding mechanism 19b is not limited to a push type disposed on the filler material supplying device 19 side and pushes out the filler material M, but may also be a pull type or push-pull type disposed on a robot arm or the like.

The heat source control device 23 is a welding power source that supplies the power required for welding by the manipulator 17. The heat source control device 23 adjusts the welding current and welding voltage supplied when forming a bead in which the filler metal M is melted and solidified. Further, the filler metal supply speed of the filler metal supply device 19 is adjusted in conjunction with welding conditions such as welding current and welding voltage set by the heat source control device 23.

The heat source for melting the filler metal M is not limited to the above-mentioned arc. For example, heat sources using other methods may be used, such as a heating method using a combination of an arc and a laser, a heating method using plasma, a heating method using an electron beam or a laser. When heating with an electron beam or laser, the amount of heating can be controlled more precisely, the state of the formed beads can be maintained more appropriately, and this can contribute to further improving the quality of the laminated structure. Furthermore, the material of the filler metal M is not particularly limited. For example, the filler material used may be mild steel, high-strength steel, aluminum, aluminum alloy, nickel, or nickel-based alloy, depending on the characteristics of the shaped object W. The types of M may be different.

The modeling control device 15 centrally controls each of the above-mentioned parts.

The layered manufacturing system 100 configured as described above operates according to a modeling program created based on a modeling plan for the object W. The modeling program is composed of a large number of instruction codes, and is created based on an appropriate algorithm depending on various conditions such as the shape, material, and amount of heat input of the object. When the supplied filler metal M is melted and solidified while moving the torch 11 according to this modeling program, a linear weld bead B, which is a molten solidified body of the filler metal M, is formed on the base 13. Ru. That is, the manipulator control device 21 drives the manipulator 17 and the heat source control device 23 based on a predetermined program provided from the modeling control device 15. The manipulator 17 moves the torch 11 to form a weld bead B while melting the filler metal M with an arc according to a command from the manipulator control device 21 . By sequentially forming and stacking the weld beads B in this manner, a shaped article W having a desired shape can be obtained.

FIG. 2 is a functional block diagram of the modeling control device 15. The modeling control device 15 includes a modeling information acquisition section 31, a predicted shape calculation section 33, a change necessity determination section 35, and a lamination condition adjustment section 37, and functions as a control information modification device. Details of each part will be described later, but the general functions are as follows.

The modeling information acquisition unit 31 acquires modeling information regarding the modeling path of the weld bead B, the stacking direction, and the stacking conditions of the weld bead B.

The predicted shape calculation unit 33 calculates the predicted shape of the bead layer on which the weld bead B is stacked, based on the modeling path of the weld bead B and the lamination conditions of the weld bead B acquired by the modeling information acquisition unit 31.

The change necessity determining unit 35 calculates the layer height (layer spacing) BLh of the bead layer BL made of the weld bead B based on the predicted shape calculated by the predicted shape calculating unit 33, and determines the layer height BLh. Based on the distribution, it is determined whether the lamination conditions of weld bead B need to be changed.

The lamination condition adjustment section 37 adjusts the lamination conditions of the weld bead B for each location when the change necessity determination section 35 determines that the lamination conditions of the weld bead B need to be changed.

The above-mentioned modeling control device 15 is configured by hardware using an information processing device such as a PC (Personal Computer), for example. Each function of the modeling control device 15 is realized by a control section (not shown) reading a program having a specific function stored in a storage device (not shown) and executing the program. Storage devices include RAM (Random Access Memory) which is a volatile storage area, ROM (Read Only Memory) which is a non-volatile storage area, HDD (Hard Disk Drive), SSD (Solid State Drive), etc. storage can be exemplified. Furthermore, examples of the control unit include a processor such as a CPU (Central Processing Unit), an MPU (Micro Processor Unit), or a dedicated circuit. In addition to the embodiments described above, the modeling control device 15 may be another computer remotely connected to the additive manufacturing system 100 via a network or the like.

<Control information generation procedure>
FIG. 3 is a flowchart showing a procedure for modifying control information by the control information modifying device.

The modeling information acquisition unit 31 acquires information regarding the modeling path of the weld bead B, the stacking direction, the bead shape, and the stacking conditions of the weld bead B as the modeling information (step S1).

The shaping path and stacking direction in the shaping information of this weld bead B can be calculated by known means. For example, various trajectory patterns can be applied to shape data obtained by slicing a modeled object into multiple layers in CAD data or the like. Alternatively, trajectory information generated and stored in advance may be read. Note that the trajectory information to be read includes, for example, the coordinate information (X, Y, Z) of points included in the path of weld bead B, the pitch between the paths of adjacent weld bead B, the interval between each bead layer, each Examples include the stacking order of the passes of weld bead B.

On the other hand, regarding information on the bead shape of weld bead B, information such as the shape model of weld bead B, bead height, and bead width is acquired.

As for the shape model, it is desirable to use one that reproduces the phenomenon that occurs when weld beads B are actually stacked, such as a model that takes into account the overlap between adjacent weld beads B, and a model that reproduces the shape of sagging toward the lower layer.

FIG. 4 is an example of a model that takes into account the overlap between adjacent weld beads B. In each model, the cross-sectional shape of the model BM1 of the path P1 serving as a reference is a trapezoid, the model BM2 of the path PS2 is provided adjacent to the model BM1, and the model BM3 of the path PS3 is provided adjacent to the model BM2. It is being Models BM2 and BM3 partially overlap the model placed on the left side of FIG. As a result, the shape of model BM2 becomes a polygonal shape (pentagon) that nestles on one hypotenuse of model BM1, and the shape of model BM3 becomes a polygonal shape (pentagon) that nestles on one hypotenuse of model BM2. In this way, each of BM1, BM2, and BM3 has a shape that approximates the cross-sectional shape of an actual weld bead.

FIG. 5 is an example of a model that reproduces the shape in which molten metal drips toward the lower layer. Among the model BM1 with a trapezoidal cross-sectional shape stacked on the base 13 and the models BM2, BM3, ..., BMn (n is an integer) in the upper layer than the model BM1, the upper trapezoidal bead models BM2, BM3, ... , BMn, downwardly extending hanging portions 47A and 47B are added to both ends of the bottom side 41. In this way, by setting the models BM2, BM3, ..., BMn provided with the hanging portions 47A, 47B as bead models for lamination planning, the bead height of weld bead B is created in weld bead B. Less susceptible to sagging of molten metal. Thereby, even under conditions where the molten metal of the weld bead B tends to sag, such as in an overhang portion, the predicted shape of the contour and the actual shape can be easily matched.

The bead width and bead height of weld bead B may be related to welding conditions such as welding speed and feeding speed.

For example, the bead height H may be obtained from equation (1), and the bead width LW may be obtained from equation (2).
H = C ₁ + C ₂ W _f + C ₃ T _s + C ₄ W _f ² + C ₅ T _s ² + C ₆ W _f T _s ...Formula (1)
LW=D ₁ +D ₂ W _f +D ₃ T _s +D ₄ W _f ² +D ₅ T _s ² +D ₆ W _f T _s ...Formula (2)
Ts: Torch movement speed Wf: Filler material feeding speed C ₁ to C ₆ : Coefficient D ₁ to D ₆ : Coefficient

The predicted shape calculation unit 33 calculates the predicted shape of the bead layer BL based on the modeling information acquired by the modeling information acquisition unit 31 (step S2). In other words, the shape of the bead layer BL made of the weld bead B is predicted by giving the lamination conditions such as welding current, welding voltage, feeding speed, and welding speed to the information on the shaping path and lamination direction of the weld bead B. . The model shape shown in FIGS. 4 and 5 may be used to predict the shape of the bead layer BL. Note that when calculating the predicted shape of the bead layer BL, it is preferable to fix the conditions within the same pass in order to understand the relationship between the predicted shape and the lamination conditions.

Here, FIGS. 6 and 7 show an example of a predicted shape of a cylindrical object W having a conical shape that is eccentric from the bottom to the top, and the predicted shape calculation unit 33 calculates the shape of the object W. is sliced to design a plurality of bead layers BLi (i=1 to N) consisting of weld beads Bi (i=1 to N).

Thereafter, for each bead layer BLi (i=1 to N) of weld bead B, sequentially from the bottom, the change necessity determination unit 35 determines whether or not the lamination conditions need to be changed (steps S3, S4), and the lamination condition adjustment unit 37 determines whether or not the lamination conditions need to be changed. Lamination conditions are adjusted (step S5).

In the change necessity determination, first, the change necessity determination unit 35 calculates the distribution of layer heights BLhi (i=1 to N) of each bead layer BLi (i=1 to N) based on the predicted shape. (Step S3).

Further, the change necessity determining unit 35 determines whether the bead layer BLi( It is determined for each bead layer BLi whether the bead layer BLi has an inclination angle θ that requires a change in the lamination conditions (i=1 to N) (step S4).

When the change necessity determination unit 35 determines that the lamination conditions of the weld bead Bi (i=1 to N) need to be changed (step S4: Yes), the lamination condition adjustment unit 37 changes the bead layer BLi (i= 1 to N) and the lamination direction Z, the lamination of weld beads Bi (i = 1 to N) forming the bead layer BLi (i = 1 to N) Conditions are adjusted for each location (step S5).

By the way, as shown in FIGS. 6 and 7, in the case of modeling a cylindrical object W having a conical shape that is eccentric from the bottom to the top, the bead layer BLi (i=1 to N) is In the circumferential direction, there are laminated parts that are laminated substantially perpendicularly along the laminated direction Z, and laminated parts that are laminated obliquely at an inclination angle θ with respect to the laminated direction Z. Therefore, in this modeling example, as shown in FIG. ). As shown in FIG. 9, for example, in a lamination location (right side in FIG. 9) where the lamination is not inclined along the lamination direction Z and laminated vertically (θ=0°), the bead height of the weld bead Bi is This substantially matches the layer height BLhi of BLi. On the other hand, in a lamination location (left side in FIG. 9) that is inclined at an inclination angle θ with respect to the lamination direction Z (θ≠0°), the maximum bead height of the weld bead Bi is not equal to the layer height BLhi of the bead layer BLi. . Therefore, when the predicted shape of the weld bead Bi is considered, the layer boundary shown in FIG. 7 is no longer realized in the bead layer BLi in the shaped object W. Then, as the deviations in the layer height BLhi (i=1 to N) accumulate, the layer boundary surface of the bead layer BLi (i=1 to N) gradually tilts as shown in FIG.

In an example of modeling such a modeled object W, first, the change necessity determining unit 35 extracts the maximum value BLh1max and minimum value BLh1min of the layer height BLh1 for the first bead layer BL1, and extracts the maximum value BLh1max and minimum value BLh1min of the layer height BLh1. It is determined whether the difference between the maximum value BLh1max and the minimum value BLh1min of the layer height BLh1 is within a threshold value ε (step S4).

Next, the lamination condition adjustment unit 37 adjusts the lamination conditions so that the layer height BLh1 of the first bead layer BL1 becomes uniform (step S5). Specifically, based on the inclination angle θ at each location of the bead layer BL1, the welding current, welding voltage, feeding speed, welding speed, etc. under the lamination conditions used to calculate the predicted shape of the bead layer BL1 are adjusted. do. Thereby, as shown in FIGS. 10 and 11, the amount of welding of the weld bead B1 is adjusted for each location Pa, Pb, Pc, . . . . Then, the amount of welding bead B1 is increased or decreased depending on the location, and the state is changed from before the adjustment of the amount of welding (broken line in FIG. 11) to after adjusting the amount of welding (solid line in FIG. 11). For example, in a lamination location (on the right side in FIG. 11) where the layers are stacked vertically (θ=0°) without being inclined along the stacking direction Z, the amount of deposited weld bead B1 is reduced, and the welding area is tilted with respect to the stacking direction Z. In the laminated portion (left side in FIG. 11) that is inclined at an angle θ (θ≠0°), the amount of weld bead B1 deposited is increased. Thereby, the layer height BLh1 of the bead layer BL1 made of the weld bead B1 is made uniform (see FIG. 11). The amount of deposited weld bead B is preferably adjusted so that the layer height BLh1 of the bead layer BL1 becomes a preset reference layer height BLhs. Note that, when the change necessity determining unit 35 determines that the lamination condition of the weld bead B1 does not need to be changed (step S4: No), the lamination condition adjustment unit 37 changes the lamination condition of the weld bead B1 forming the bead layer BL1. remain as is.

Thereafter, the change necessity determination process (steps S3, S4) and the lamination condition change process (step S5) are repeated (step S6). As a result, if it is determined that it is necessary to change the lamination conditions of the weld bead Bi (i = 2 to N) for the second and subsequent bead layers BLi (i = 2 to N) (step S4: No), then The lamination conditions of the weld beads Bi (i=2 to N) forming the bead layer BLi (i=2 to N) are adjusted (step S5), and the layer height BLhi (i=2 to N) is adjusted.

As a result, as shown in FIG. 12, each bead layer BLi (i=1 to N) consisting of each weld bead Bi (i=1 to N) has a layer height BLhi (i=1 to N), respectively. Equalized. Therefore, even if a part of the object W includes an overhang, local deviations in the layer height BLhi (i=1 to N) can be suppressed, and a high-quality object W can be smoothly formed. It can be shaped into

Note that the change necessity determination unit 35 determines whether the change is necessary (step S4) by extracting the layer heights BLhi1 and BLhi2 at two specific locations for each bead layer BLi (i=1 to N), and This may be done depending on whether the difference between BLhi1 and BLhi2 falls within a threshold (tolerable value) ε.

Moreover, if the lamination conditions of the weld bead B are adjusted to adjust the amount of welding, there is a risk that excessive excess thickness will be generated at the location where the amount of welding increases. Therefore, in addition to adjusting the amount of welding, the bead width of the weld bead B may also be adjusted. For example, by adjusting the weaving, adjusting the inclination angle of the torch 11, adjusting the amount of heat input, etc., the bead width of the weld bead B is limited, and the bead height is adjusted while suppressing an increase in the bead width. Then, as shown in FIG. 13, the layer height BLhi (i=1 to N) of the bead layer BLi (i=1 to N) can be made uniform while suppressing the generation of excessive excess thickness due to an increase in the amount of welding.

In this way, according to the present configuration example, the lamination conditions of the weld bead B are adjusted for each location to suppress variations in the layer height BLh of the bead layer BL, so that a part of the object W includes an overhang portion. Even if the layer height BLh is shifted, local deviations in the layer height BLh can be suppressed. This suppresses interference between the torch 11 and the object W being formed and arc start errors that may occur due to local deviations in the layer height BLh, and enables smooth modeling of a high-quality object W.

Note that if the adjustment amount of the lamination conditions of weld bead B within the same pass is extremely large, there is a possibility that the lamination process of weld bead B may become unstable. In such a case, a tolerance value is set in advance, and if the amount of adjustment of the lamination conditions becomes larger than the tolerance value, at least one of the number of divisions of the target shape of the object W and the lamination direction Z of the weld bead B is adjusted by the amount of adjustment. It is preferable to repeat the correction until the value falls below the allowable value.

For example, as shown in FIG. 14, compared to shape data obtained by slicing the three-dimensional shape of the created object W and dividing it into a plurality of bead layers BL (see left in FIG. 14), shape data obtained by increasing the number of divisions ( (see upper right of FIG. 14) is repeatedly created until the adjustment amount becomes less than or equal to the allowable value. Alternatively, the shape data of the stacking direction Za tilted toward the side where the amount of adjustment of the layer height BLh increases (see the lower right of FIG. 14) is repeatedly created until the amount of adjustment becomes equal to or less than the allowable value. Thereby, the amount of adjustment of the lamination conditions of weld bead B within the same pass can be suppressed, and the lamination process of weld bead B can be stabilized.

As described above, the present invention is not limited to the embodiments described above, and those skilled in the art can modify and apply them based on the mutual combination of the configurations of the embodiments, the description of the specification, and well-known techniques. It is also contemplated by the present invention to do so, and is within the scope for which protection is sought.

As mentioned above, the following matters are disclosed in this specification.
(1) Melt the welding material while moving the torch along the modeling path to form a weld bead on the target surface, and create a three-dimensional shaped object in which the target shape is divided into multiple layers and bead layers are laminated. A control information modification method for modifying control information for controlling an additive manufacturing apparatus, the method comprising:
a shaping information acquisition step of acquiring shaping information regarding a shaping route, a stacking direction, and stacking conditions of the weld bead forming the bead layer;
a predicted shape calculation step of calculating a predicted shape of the bead layer based on the modeling information;
a change necessity determining step of determining whether or not the lamination conditions need to be changed based on the predicted shape;
When it is determined that the lamination conditions need to be changed, a lamination condition adjustment step of adjusting the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer;
A method of modifying control information, including:
According to the control information modification method with this configuration, the lamination conditions of the weld bead are adjusted for each location to suppress variations in the height of the bead layer, so even if a part of the printed object includes an overhang part, Local deviations in layer height can be suppressed. This suppresses interference between the torch and the object being formed and arc start errors that may occur due to local deviations in layer height, and enables smooth modeling of high-quality objects.

(2) In the change necessity determining step, a distribution of layer heights based on the predicted shape of the bead layer is calculated, and the difference in the layer height of each of the bead layers is greater than a preset threshold. The control information modification method according to (1), wherein if the lamination condition is large, it is determined that the lamination condition needs to be changed.
According to the control information modification method having this configuration, it is possible to appropriately determine whether or not the lamination conditions need to be changed in accordance with the presence or absence of an overhang portion or curved surface.

(3) The control information modification method according to (2), wherein the layer height distribution is calculated based on an inclination angle of the surface of the shaped object with respect to the stacking direction.
According to the control information modification method having this configuration, by considering the inclination angle of the surface of the object, it is possible to obtain an accurate layer height distribution for each location.

(4) When the adjusted amount of the lamination condition becomes larger than a preset tolerance value, at least one of the number of divisions of the target shape of the modeled object and the lamination direction of the weld bead is The control information modification method according to any one of (1) to (3), further comprising the step of repeatedly modifying the information until the value becomes equal to or less than the allowable value.
According to the control information modification method having this configuration, it is possible to prevent the amount of adjustment caused by changing the lamination conditions in each bead layer from becoming excessively large, and to stabilize the lamination process.

(5) Melt the welding material while moving the torch along the modeling path to form a weld bead on the target surface, and create a three-dimensional shaped object in which the target shape is divided into multiple layers and bead layers are laminated. A control information modification device for modifying control information for controlling an additive manufacturing device, the control information modification device comprising:
a shaping information acquisition unit that acquires shaping information regarding a shaping path, a stacking direction, and stacking conditions of the weld bead forming the bead layer;
a predicted shape calculation unit that calculates a predicted shape of the bead layer based on the modeling information;
a change necessity determination unit that determines whether or not the lamination conditions need to be changed based on the predicted shape;
a lamination condition adjustment unit that adjusts the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer when it is determined that the lamination conditions need to be changed;
A control information modification device including:
According to the control information modification device with this configuration, the lamination conditions of the weld bead are adjusted for each location to suppress variations in the height of the bead layer, so even if a part of the modeled object includes an overhang part, Local deviations in layer height can be suppressed. This suppresses interference between the torch and the object being formed and arc start errors that may occur due to local deviations in layer height, and enables smooth modeling of high-quality objects.

(6) Melt the welding material while moving the torch along the modeling path to form a weld bead on the target surface, and create a three-dimensional model in which the target shape is divided into multiple layers and bead layers are laminated. A program for modifying control information for controlling an additive manufacturing apparatus, the program comprising:
to the computer,
a shaping information acquisition function that acquires shaping information regarding a shaping path, a stacking direction, and stacking conditions of the welding bead forming the bead layer;
a predicted shape calculation function that calculates a predicted shape of the bead layer based on the modeling information;
a change necessity determination function that determines whether or not the lamination conditions need to be changed based on the predicted shape;
a lamination condition adjustment function that adjusts the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer when it is determined that the lamination conditions need to be changed;
A program to make this happen.
According to the program with this configuration, the lamination conditions of the weld bead are adjusted for each location to suppress variations in the layer height of the bead layer, so even if a part of the printed object includes an overhang part, the layer height can be adjusted. It is possible to suppress local deviations of . This suppresses interference between the torch and the object being formed and arc start errors that may occur due to local deviations in layer height, and enables smooth modeling of high-quality objects.

11 Torch 15 Molding control device (control information correction device)
31 Molding information acquisition unit 33 Predicted shape calculation unit 35 Change necessity determination unit 37 Lamination condition adjustment unit 100 Additive manufacturing system (additive manufacturing apparatus)
B Weld bead W Modeled object θ Inclination angle

Claims (6)

Additive manufacturing that melts the welding material while moving the torch along the modeling path to form a weld bead on the target surface, and creates a three-dimensional object with a stack of bead layers that divide the target shape into multiple layers. A control information modification method for modifying control information for controlling a device, the method comprising:
a shaping information acquisition step of acquiring shaping information regarding a shaping route, a stacking direction, and stacking conditions of the weld bead forming the bead layer;
a predicted shape calculation step of calculating a predicted shape of the bead layer based on the modeling information;
a change necessity determining step of determining whether or not the lamination conditions need to be changed based on the predicted shape;
When it is determined that the lamination conditions need to be changed, a lamination condition adjustment step of adjusting the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer;
including,
Control information modification method. In the change necessity determining step, a layer height distribution based on the predicted shape of the bead layer is calculated, and if the difference in the layer height in each of the bead layers is larger than a preset threshold value, determining that the lamination conditions need to be changed;
The control information modification method according to claim 1. The layer height distribution is calculated based on the inclination angle of the surface of the shaped object with respect to the stacking direction.
The control information modification method according to claim 2. When the adjusted amount of the lamination condition is larger than a preset tolerance value, at least one of the number of divisions of the target shape of the modeled object and the lamination direction of the weld bead, the adjustment amount is less than or equal to the tolerance value. It further includes a step of iteratively correcting until
The control information modification method according to any one of claims 1 to 3. Additive manufacturing that melts the welding material while moving the torch along the modeling path to form a weld bead on the target surface, and creates a three-dimensional object with a stack of bead layers that divide the target shape into multiple layers. A control information modification device that modifies control information for controlling a device,
a shaping information acquisition unit that acquires shaping information regarding a shaping route, a stacking direction, and stacking conditions of the weld bead forming the bead layer;
a predicted shape calculation unit that calculates a predicted shape of the bead layer based on the modeling information;
a change necessity determination unit that determines whether or not the lamination conditions need to be changed based on the predicted shape;
a lamination condition adjustment unit that adjusts the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer when it is determined that the lamination conditions need to be changed;
including,
Control information modification device. Additive manufacturing that melts the welding material while moving the torch along the modeling path to form a weld bead on the target surface, and creates a three-dimensional object with a stack of bead layers that divide the target shape into multiple layers. A program for modifying control information for controlling a device,
to the computer,
a shaping information acquisition function that acquires shaping information regarding a shaping path, a stacking direction, and stacking conditions of the welding bead forming the bead layer;
a predicted shape calculation function that calculates a predicted shape of the bead layer based on the modeling information;
a change necessity determination function that determines whether or not the lamination conditions need to be changed based on the predicted shape;
a lamination condition adjustment function that adjusts the lamination conditions of the weld bead for each location to suppress variations in the layer height of the bead layer when it is determined that the lamination conditions need to be changed;
In order to realize
program.

Images