JP2021016988A - Excess thickness setting method of lamination molded article, manufacturing method and manufacturing apparatus of lamination molded article - Google Patents

Abstract

To provide an excess thickness setting method of a lamination molded article capable of elevating precision of a molding and machine work and suppressing a manufacturing cost and a manufacturing time, and a manufacturing method and a manufacturing apparatus of a lamination molded article.SOLUTION: A method includes: a deformation prediction step of predicting a deformation volume due to release strain of a lamination molded article W caused when parting the lamination molded article W from a base plate 23; a deformation correction step of obtaining a correction profile Pmd by correcting an objective profile Pm showing an outer edge of a target shape of a structure W1 in relation to a displacement δA which is a deformation volume in an opposite direction to the deformation due to the release strain; and an excess thickness setting step of controlling a laminate profile Ps showing an outer edge profile of the lamination molded article W in a manner that the excess thickness from the correction profile Pmd to the outer edge of the lamination molded article W stays within a predetermined reference range.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for setting a surplus thickness of a laminated model, a method for manufacturing a laminated model, and a manufacturing apparatus.

In recent years, there has been an increasing need for modeling using a 3D printer as a means of production, and research and development are being promoted toward the practical application of modeling using metal materials. A 3D printer for modeling a metal material uses a heat source such as a laser, an electron beam, or an arc to melt a metal powder or a metal wire and laminate the molten metal to produce a laminated model.

As a metal 3D printer that shapes a modeled object by arc welding on the base plate, a rigid plate with the modeling table and the base separated by spacers is provided detachably from the modeling table and the base, and on the base. It is known that a rigid plate is submerged in a cooling medium when a modeled object is modeled, and the rigid plate is subjected to secondary processing after modeling (see Patent Document 1).

In addition, it accepts the material property values, modeling conditions, and conditions related to the size of the modeled object for the modeled object formed by laminated modeling, and is based on these conditions and the constraint conditions that quantify the restraint state around the molten pool generated during modeling. A technique for calculating the intrinsic strain from the linear form of the intrinsic strain derived from the above is known (see Patent Document 2).

JP-A-2017-144446 JP-A-2018-184623

By the way, in laminated modeling in which a welded bead is laminated on a base material to form a modeled object, the material is melted and solidified to form the model, so that residual stress is generated inside the modeled object due to heat shrinkage or the like. There is. If the base metal is cut and removed in this state, the modeled object may be deformed due to the release of the residual stress, and an error may occur with respect to the target shape. Therefore, in order to suppress an error with respect to the target shape, after setting a large amount of surplus thickness, cutting work such as roughing and finishing is performed thereafter. However, if the surplus thickness is increased in consideration of the release strain, the manufacturing cost and the manufacturing time increase. Further, since it is necessary to leave a large amount of cutting allowance in the cutting process in the roughing process, the processing time for the finishing process becomes long.

With the technique of Patent Document 1 for correcting the deformation of the base plate and the technique of Patent Document 2 for calculating the intrinsic strain of the modeled object to be modeled, it is difficult to suppress an error with respect to the target shape of the modeled object after cutting and removing the base material. Is.

Therefore, an object of the present invention is to provide a method for setting a surplus wall amount of a laminated model, a method for producing a laminated model, and a manufacturing apparatus capable of improving the accuracy of modeling and machining and suppressing the manufacturing cost and the manufacturing time. And.

The present invention has the following configuration.
(1) The lamination when a laminated model is laminated on a base plate by a welding bead formed by melting and solidifying a filler metal, and the laminated model is processed to form a structure having a target shape. It is a method to set the amount of surplus meat of the modeled object.
A deformation prediction step for predicting the amount of deformation due to the release strain of the laminated model that occurs when the laminated model is separated from the base plate.
A deformation correction step of obtaining a correction profile in which a target profile representing the outer edge of the target shape of the structure is corrected according to the displacement which is the amount of deformation in the direction opposite to the deformation due to the release strain.
A step of setting a surplus thickness amount that adjusts a laminate profile indicating the outer edge shape of the laminated modeled object so that the surplus wall amount from the correction profile to the outer edge of the laminated modeled object falls within a predetermined reference range.
How to set the amount of surplus meat including.
(2) The laminated model designed by the surplus thickness setting method described in (1) above is laminated on the base plate by the welding bead, and the laminated model is separated from the base plate to obtain the target. A method for manufacturing a modeled object to be processed into the structure having a shape.
(3) Manufacture of a laminated model in which a laminated model is laminated on a base plate by a welding bead formed by melting and solidifying a filler metal, and the laminated model is processed to form a structure having a target shape. It ’s a device,
A displacement amount calculation unit that predicts the amount of deformation due to the release strain of the laminated model that occurs when the laminated model is separated from the base plate.
A correction profile in which the target profile representing the outer edge of the target shape of the structure is corrected according to the displacement, which is the amount of deformation, in the direction opposite to the deformation due to the release strain is obtained, and the laminated model is obtained from the correction profile. A surplus wall amount setting unit that adjusts the laminate profile showing the outer edge shape of the laminated model so that the surplus wall amount to the outer edge falls within a predetermined reference range.
Equipment for manufacturing laminated objects.

According to the present invention, the accuracy of modeling and machining can be improved, and the manufacturing cost and manufacturing time can be suppressed.

It is a schematic block diagram of the manufacturing apparatus of the laminated model which concerns on this invention. It is a schematic cross-sectional view along the vertical direction of a laminated model. It is schematic cross-sectional view along the vertical direction explaining the procedure of the basic laminated modeling of a laminated model. It is schematic cross-sectional view along the vertical direction explaining the procedure of the basic laminated modeling of a laminated model. It is schematic cross-sectional view along the vertical direction explaining the procedure of the basic laminated modeling of a laminated model. It is schematic cross-sectional view along the vertical direction of the laminated model article explaining the deformation of the laminated model object when the base plate is removed. It is a flowchart which shows the setting procedure of the surplus meat amount. It is a schematic diagram of a laminated model | structure explaining the procedure of setting the surplus thickness amount. It is a schematic diagram of a laminated model | structure explaining the procedure of setting the surplus thickness amount. It is a schematic diagram of a laminated model | structure explaining the procedure of setting the surplus thickness amount.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<Manufacturing equipment for laminated objects>
FIG. 1 is a schematic configuration diagram of a manufacturing apparatus for a laminated model according to the present invention.
The laminated model manufacturing apparatus 100 having this configuration includes a modeling unit 11, a controller 13 that controls the modeling unit 11, and a power supply device 15.

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

The welding robot 19 is an articulated robot, and the filler metal M is continuously supplied to the torch 17 attached to the tip shaft of the robot arm. The position and posture of the torch 17 can be arbitrarily set three-dimensionally within the range of the degree of freedom of the robot arm.

The torch 17 generates an arc from the tip of the filler metal M in a shield gas atmosphere while holding the filler metal M. The torch 17 has a shield nozzle (not shown), and shield gas is supplied from the shield nozzle. The arc welding method may be either a consumable electrode type such as shielded metal arc welding or carbon dioxide arc welding, or a non-consumable electrode type such as TIG welding or plasma arc welding, and is appropriately selected according to the laminated model to be manufactured. Weld.

For example, in the case of the consumable electrode type, the contact tip is arranged inside the shield nozzle, and the filler metal M to which the melting current is supplied is held by the contact tip. The torch 17 generates an arc from the tip of the filler metal M in a shield gas atmosphere while holding the filler metal M. The filler metal M is fed from the filler metal supply unit 21 to the torch 17 by a feeding mechanism (not shown) attached to a robot arm or the like. Then, when the filler metal M that is continuously fed is melted and solidified while moving the torch 17, a linear welded bead B that is a molten solidified body of the filler metal M is formed on the base plate 23.

The filler metal M is fed from the filler metal supply unit 21 to the torch 17 by a feeding mechanism (not shown) attached to the robot arm or the like of the welding robot 19. Then, the torch 17 moves along a desired welding line by driving the robot arm by a command from the controller 13. Further, the filler metal M that is continuously fed is melted and solidified in a shield gas atmosphere by an arc generated at the tip of the torch 17. As a result, the welded bead B, which is a molten solidified body of the filler metal M, is formed. As described above, the modeling unit 11 is a laminated modeling device for laminating the molten metal of the filler metal M, and the laminated model W is modeled by laminating the welded beads B in a multi-layered manner on the base plate 23.

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

The controller 13 includes a stacking plan creation unit 31, a deformation amount calculation unit 33, a surplus thickness setting unit 34, a program generation unit 35, a storage unit 37, an input unit 39, a display unit 40, and each of these units. It has a control unit 41 to be connected. Three-dimensional shape data (CAD data, etc.) representing the shape of the laminated model W to be manufactured and various instruction information are input to the control unit 41 from the input unit 39. The display unit 40 displays various images based on the image information transmitted from the control unit 41.

The laminated model manufacturing apparatus 100 having this configuration generates a shape model for bead formation using the input three-dimensional shape data, and creates a stacking plan such as a movement locus of the torch 17 and welding conditions. The control unit 41 creates an operation program according to the stacking plan, and drives each unit according to this operation program to laminate and model the laminated model W having a desired shape.

The stacking plan creation unit 31 decomposes the shape model of the input three-dimensional shape data into a plurality of layers according to the height of the welding bead B. Then, for each layer of the disassembled shape model, the trajectory of the torch 17 for forming the welded bead B and the heating conditions (bead width, bead stacking height, etc.) for forming the welded bead B are set. Create a stacking plan that defines (including). Further, the lamination plan creation unit 31 has a target profile Pm representing the outer edge of the target shape of the structure W1 produced by machining the laminated model W formed by laminating the weld beads B and before machining. Create a laminated body profile Ps representing the outer shape of the laminated model W.

The deformation amount calculation unit 33 analytically obtains the deformation amount generated by the release of the residual stress of the laminated model W when the base plate 23 is removed from the laminated model W formed according to the lamination plan.

The surplus wall amount setting unit 34 sets the surplus wall amount to be the cutting allowance from the target profile Pm, which is the profile of the structure W1, to the outer edge of the laminated model W. Further, the surplus thickness setting unit 34 corrects the surplus thickness amount according to the deformation amount predicted by the deformation amount calculation unit 33.

The program generation unit 35 drives each part of the modeling unit 11 to set a modeling procedure for the laminated model W, and creates an operation program for causing the computer to execute this procedure. The created operation program is stored in the storage unit 37.

In addition to storing the operation program in the storage unit 37, the specifications of various drive units of the modeling unit 11 and the material information of the filler metal M are also stored, and when the program generation unit 35 creates the operation program, The stored information is appropriately referred to when executing the operation program. The storage unit 37 is composed of a storage medium such as a memory or a hard disk, and can input and output various types of information.

The controller 13 including the control unit 41 is a computer device including a CPU, a memory, an I / O interface, and the like. The controller 13 has a function of reading data and programs stored in the storage unit 37, executing data processing and an operation program, and a function of driving and controlling each part of the modeling unit 11. The control unit 41 creates and executes an operation program based on an operation from the input unit 39 or an instruction by communication or the like.

When the control unit 41 executes the operation program, each unit such as the welding robot 19 and the power supply device 15 is driven according to a predetermined programmed procedure. The welding robot 19 moves the torch 17 along the programmed trajectory according to the command from the controller 13, and melts the filler metal M by an arc at a predetermined timing to bring the welding bead B to a desired position. Form.

The operation program referred to here is an instruction code for causing the modeling unit 11 to carry out the procedure for forming the welded bead B designed by a predetermined calculation from the input three-dimensional shape data of the laminated model W. The control unit 41 causes the modeling unit 11 to manufacture the laminated model W by executing the operation program stored in the storage unit 37. That is, the control unit 41 reads a desired operation program from the storage unit 37, moves the torch 17 by driving the welding robot 19 according to this operation program, and generates an arc from the tip of the torch 17. As a result, the welded bead B is repeatedly formed on the base plate 23, and the laminated model W is formed.

Each calculation unit such as the stacking plan creation unit 31, the deformation amount calculation unit 33, the surplus thickness setting unit 34, and the program generation unit 35 is provided in the controller 13, but is not limited thereto. Although not shown, the above-mentioned arithmetic unit is provided on an external computer such as a server or a terminal which is separately arranged from the manufacturing apparatus 100 for a laminated model, for example, via a communication means such as a network or a storage medium. It may be provided. By providing the above-mentioned calculation unit in the external computer, it is possible to create a desired operation program without requiring the manufacturing apparatus 100 for the laminated model, and the program creation work is not complicated. Further, by transferring the created operation program to the storage unit 37 of the controller 13, the modeling unit 11 can be operated in the same manner as when the operation program is created by the controller 13.

<Basic procedure for laminated molding>
Next, the procedure of the laminated modeling for the laminated model W of the illustrated example illustrated as a simple model will be briefly described.

FIG. 2 is a schematic cross-sectional view of the laminated model W along the vertical direction. 3A to 3C are schematic cross-sectional views taken along the vertical direction for explaining the basic procedure for laminating the laminated model W. FIG. 4 is a schematic cross-sectional view taken along the vertical direction of the laminated model W for explaining the deformation of the laminated model W when the base plate is removed.

As shown in FIG. 2, the laminated model W according to an example is formed in a cylindrical shape. The laminated model W is modeled on the base plate 23. The base plate 23 is made of a metal plate such as a steel plate, and basically, a base plate 23 larger than the bottom surface (bottom layer surface) of the laminated model W is used. The base plate 23 is not limited to a plate shape, and may be a base having another shape such as a block body or a rod shape. Although FIG. 2 shows an example in which one welded bead B forms the bead layer BL for one layer, the bead layer BL can also be formed by a plurality of welded beads B.

As shown in FIG. 3A, in order to form the laminated model W, the welding robot 19 moves the torch 17 along the instructed trajectory according to the operation program on the base plate 23 installed in advance. Then, an arc is generated with the movement of the torch 17, and the welding bead B is formed along the trajectory in which the torch 17 moves. The welded bead B is formed by melting and solidifying the filler metal M, and the bead layer BL of the next layer is repeatedly laminated on the formed bead layer BL.

As shown in FIG. 3B, after the laminated model W is formed on the base plate 23, the base plate 23 is cut with a cutting machine such as a wire saw or a diamond cutter to remove the base plate 23 from the laminated model W, and the laminated model W is removed. W is separated. After that, as shown in FIG. 3C, for example, the surplus wall portion set by the surplus wall amount setting unit 34 is cut with respect to the laminated model W and processed into the structure W1. The base plate 23 may be removed after cutting the surplus portion of the laminated model W.

By the way, in the layered manufacturing method in which the welded beads B are laminated on the base plate 23 to form the layered model W, since the material is melted and solidified to form the model, residual stress is generated inside the layered model W due to heat shrinkage or the like. It may have occurred. Then, when the base plate 23 is cut and removed from the laminated model W, the laminated model W may be deformed by releasing the residual stress. For example, as shown in FIG. 4, in the laminated model W formed into a cylindrical shape, by removing the base plate 23, the end side joined to the base plate 23 is expanded in diameter by releasing the residual stress, and the target shape is formed. An error may occur with respect to the shape model MA (indicated by the dotted line in FIG. 4). For this reason, it may be difficult to cut the surplus portion portion thereafter to obtain the structure W1.

Here, the welding deformation and residual stress of the laminated model are generally determined by the Finite Element method.
It is analyzed by a thermal elasto-plastic analysis method using Method: FEM) or a computer simulation using elastic analysis or the like.

In the thermo-elasto-plastic analysis method, the phenomenon is calculated in consideration of various non-linear elements for each of a large number of minute time steps, so that highly accurate analysis can be performed. On the other hand, in the elastic analysis, since the analysis is performed considering only the linear elements, the analysis can be performed in a short time. When the laminated model W is modeled by the laminated modeling in which the welded beads B are laminated, all the portions of the laminated model W undergo a metal melting / solidification process. When the metal melts and solidifies, natural strain (plastic strain, thermal strain) is generated in the laminated model W. Residual stress due to this natural strain is generated inside the laminated model W. The deformation amount calculation unit 33 analytically obtains a shape change due to such laminated modeling.

The deformation amount calculation unit 33 may be configured to include, for example, a partial model thermal elasto-plastic analysis unit and an overall model elasticity analysis unit. The partial model thermal elasto-plastic analysis unit performs thermal elasto-plastic analysis using a partial model of the modeled object based on the input analysis conditions (laminated modeling conditions, material physical characteristics conditions), and the intrinsic strain (plastic strain, Thermal strain) is calculated. The overall model elasticity analysis unit performs elastic analysis on the entire model of the modeled object based on the calculated intrinsic strain and derives residual stress and the like. The conditions used for the analysis include laminated molding conditions with parameters such as heat source output, heat source type, beam profile, scanning speed, scanning sequence, line offset or preheating temperature, and material Young ratio, proof stress, and linear expansion. There are mechanical property values such as a coefficient and a work hardening index, and material property conditions such as a thermal property value such as thermal conductivity or specific heat.

Such analysis processing is executed by the computer according to the program. That is, the deformation amount calculation unit 33 is a computer including a processor such as a CPU and a storage device such as a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), and an SSD (Solid State Drive). Can be configured as. In this case, the functions of each unit can be realized by the processor executing a predetermined program stored in the storage unit 37 including the storage device.

<Setting the excess thickness of the laminated model>
In the present embodiment, the deformation amount calculation unit 33 predicts the deformation amount of the laminated model W after removing the base plate 23, and based on the prediction, corrects the target profile Pm with high accuracy to obtain an appropriate surplus thickness. Set. Hereinafter, the setting of the surplus meat amount according to the present embodiment will be described in detail.

FIG. 5 is a flowchart showing a procedure for setting the surplus thickness of the laminated model. 6A to 6C are schematic views of a laminated model W for explaining a procedure for setting a surplus thickness amount.

First, the controller 13 acquires the three-dimensional shape (3D) data, which is the CAD data of the laminated model to be modeled, from the input unit 39 (S1). The three-dimensional shape data includes various dimensional information such as the coordinates of the outer edge of the laminated model W, as well as information such as the type of material referred to as necessary and the final finish.

The stacking plan creation unit 31 of the controller 13 creates a stacking plan based on the acquired three-dimensional shape data (S2). Specifically, as shown in FIG. 6A, the target of the laminated body profile Ps representing the outer shape of the laminated model W which is laminated and formed by laminating the welded beads B and the structure W1 produced by machining the laminated model W. Create a target profile Pm that represents the outer edge of the shape.

Further, the surplus wall amount setting unit 34 calculates the surplus wall amount provided around the structure W1 before machining based on the created laminated body profile Ps and target profile Pm (S3).
). Here, as described above, the laminated model W made of the welded bead B is deformed by releasing the residual stress by removing the base plate 23. As a result, the target profile Pm created by the stacking plan creation unit 31 is deformed by the release strain (see the alternate long and short dash line in FIG. 6A).

Therefore, after creating the stacking plan, the deformation amount calculation unit 33 predicts the deformation of the target profile Pm after the removal of the base plate 23 (S4), and calculates the displacement δA which is the deformation amount of the target profile Pm due to this deformation (S4). S5). Then, as shown in FIG. 6B, the deformation amount calculation unit 33 obtains the correction profile Pmd obtained by deforming the target profile Pm (see the dotted line in FIG. 6B) in the direction opposite to the deformation direction due to the release strain according to the displacement δA. .. Next, the surplus thickness setting unit 34 compares the calculated surplus thickness amount with the displacement δA, which is the deformation amount predicted by the deformation amount calculation unit 33.

Then, it is determined whether or not the surplus thickness is larger than the displacement δA and is equal to or less than the permissible displacement δA + α to which the preset permissible amount α is added (δA <surplus thickness ≦ δA + α) (S6). Here, the permissible amount α is a value set in advance in order to give an upper limit to the amount of surplus meat and to minimize the machining of excess surplus meat.

When the calculated surplus amount is larger than the displacement δA and deviates from the condition of the allowable displacement δA + α or less, the surplus amount setting unit 34 corrects the surplus amount to satisfy this condition (S3). When the surplus thickness before correction is larger than the displacement δA and satisfies the condition of the allowable displacement δA + α or less, the laminated body profile Ps including the surplus thickness is maintained.

After obtaining the correction profile Pmd in this way, as shown in FIG. 6C, the stacking plan creation unit 31 obtains the laminated body profile Ps including the region in which the surplus thickness is added to the correction profile Pmd as the final stacking plan. Create (S7).

As described above, according to the method of setting the surplus thickness of the laminated model having the present configuration, the target profile Pm representing the outer edge of the target shape is deformed due to the release strain generated when the laminated model W is separated from the base plate 23. The amount of surplus thickness can be appropriately set by correcting according to the displacement δA which is an amount. As a result, highly accurate modeling and processing can be performed in consideration of the release strain after separation from the base plate 23 after modeling, and the processing time can be suppressed to improve the processing efficiency.

Therefore, according to the method and apparatus for manufacturing the laminated model having the present configuration, the laminated model W having an appropriately set surplus thickness is formed by the welding bead B, and the laminated model W is separated from the base plate 23. By processing, the structure W1 having the target shape can be manufactured efficiently and with high accuracy.

As described above, the present invention is not limited to the above-described embodiment, and can be modified or applied by those skilled in the art based on the combination of the configurations of the embodiments with each other, the description of the specification, and the well-known technique. This is also the subject of the present invention and is included in the scope for which protection is sought.

For example, in the above example, the laminated model W has a simple cylindrical shape, but the shape of the laminated model W is not limited to this. The more complicated the shape of the laminated model W is, the more remarkable the effects of the above-mentioned lamination plan and manufacturing method are, so that it can be suitably applied.

Further, the laminated body profile Ps, the target profile Pm, or the correction profile Pmd may be superimposed and displayed on the display unit 40. In this way, the operator determines whether or not it is necessary to correct the surplus thickness amount based on each profile displayed on the display unit 40, and as a result, the surplus wallet amount needs to be corrected. If it is determined, the input unit 39 can be operated to give a change instruction to correct the laminated body profile Ps.

As a result, a stacking plan that reflects the release strain due to separation from the base plate 23 can be efficiently created. Further, the changed state can be easily confirmed from the display of the laminated body profile Ps of the changed laminated model W displayed on the display unit 40.

Further, in the above example, the amount of surplus thickness is corrected based on the deformation due to the release strain when the base plate 23 is removed, but for example, the deformation due to the release strain when machining involving roughing, finishing, etc. is performed. The excess thickness may be corrected based on the above.

As described above, the following matters are disclosed in this specification.
(1) The lamination when a laminated model is laminated on a base plate by a welding bead formed by melting and solidifying a filler metal, and the laminated model is processed to form a structure having a target shape. It is a method to set the amount of surplus meat of the modeled object.
A deformation prediction step for predicting the amount of deformation due to the release strain of the laminated model that occurs when the laminated model is separated from the base plate.
A deformation correction step of obtaining a correction profile in which a target profile representing the outer edge of the target shape of the structure is corrected according to the displacement which is the amount of deformation in the direction opposite to the deformation due to the release strain.
A step of setting a surplus thickness amount that adjusts a laminate profile indicating the outer edge shape of the laminated modeled object so that the surplus wall amount from the correction profile to the outer edge of the laminated modeled object falls within a predetermined reference range.
How to set the amount of surplus meat including.
According to this surplus thickness setting method, the surplus wall amount is corrected by correcting the target profile representing the outer edge of the target shape according to the displacement which is the deformation amount due to the release strain generated when the laminated model is separated from the base plate. Can be set appropriately. As a result, highly accurate modeling and processing can be performed in consideration of the release strain after separation from the base plate after modeling, and the processing time can be suppressed to improve the processing efficiency.

(2) A step of displaying the laminated body profile and the correction profile on the display unit.
An input process for receiving an instruction to change the modeling area of the laminated model, and
A step of changing the outer edge shape of the laminated model in response to the input change instruction and displaying the modified profile of the laminated body on the display unit.
The method for setting the amount of surplus meat according to (1).
According to this surplus thickness setting method, it is possible to confirm the correction profile displayed overlaid on the laminated body profile displayed on the display unit and input an instruction to change the modeling area of the laminated model. This makes it possible to efficiently create a stacking plan that reflects the release strain due to separation from the base plate. Further, the changed state can be easily confirmed from the display of the laminated body profile of the changed laminated model displayed on the display unit.

(3) The method for setting a surplus thickness according to (1) or (2), wherein the welded bead is formed by melting the filler metal using an arc as a heat source.
According to this method of setting the amount of surplus thickness, when the filler metal is melted using an arc as a heat source and the welded beads are laminated to form a laminated model, the effect of the heat of the welded beads is taken into consideration when the laminated model is formed. It can be modeled with high accuracy.

(4) The laminated model designed by the method for setting the surplus thickness according to any one of (1) to (3) is laminated on the base plate by the welding bead, and the laminated model is formed. A method for manufacturing a modeled object that is separated from the base plate and processed into the structure having the target shape.
According to this method for manufacturing a modeled object, a laminated modeled object having an appropriately set amount of surplus is formed by welding beads, and the laminated modeled object is separated from the base plate and processed to obtain a structure having a target shape. It can be manufactured efficiently and with high accuracy.

(5) Manufacture of a laminated model in which a laminated model is laminated on a base plate by a welding bead formed by melting and solidifying a filler metal, and the laminated model is processed to form a structure having a target shape. It ’s a device,
A displacement amount calculation unit that predicts the amount of deformation due to the release strain of the laminated model that occurs when the laminated model is separated from the base plate.
A correction profile in which the target profile representing the outer edge of the target shape of the structure is corrected according to the displacement, which is the amount of deformation, in the direction opposite to the deformation due to the release strain is obtained, and the laminated model is obtained from the correction profile. A surplus wall amount setting unit that adjusts the laminate profile showing the outer edge shape of the laminated model so that the surplus wall amount to the outer edge falls within a predetermined reference range.
Equipment for manufacturing laminated objects.
According to this laminated model manufacturing device, a structure having an appropriate surplus thickness is formed by welding beads, and the laminated body is separated from the base plate and processed to obtain a structure having a target shape. It can be manufactured efficiently and with high accuracy.

23 Base plate 33 Deformation amount calculation unit 34 Surplus wall amount setting unit 40 Display unit 100 Manufacturing equipment B Welding bead M Welding material Pm Target profile Pmd Correction profile Ps Laminated body profile W Laminated model W1 Structure δA Displacement

Claims (5)

When a laminated model is laminated on a base plate by a welding bead formed by melting and solidifying a filler metal, and the laminated model is processed to form a structure having a target shape, the laminated model is formed. It ’s a way to set the amount of surplus meat.
A deformation prediction step for predicting the amount of deformation due to the release strain of the laminated model that occurs when the laminated model is separated from the base plate.
A deformation correction step of obtaining a correction profile in which a target profile representing the outer edge of the target shape of the structure is corrected according to the displacement which is the amount of deformation in the direction opposite to the deformation due to the release strain.
A step of setting a surplus thickness amount that adjusts a laminate profile indicating the outer edge shape of the laminated modeled object so that the surplus wall amount from the correction profile to the outer edge of the laminated modeled object falls within a predetermined reference range.
How to set the amount of surplus meat including. A step of displaying the laminated body profile and the correction profile on the display unit,
An input process for receiving an instruction to change the modeling area of the laminated model, and
A step of changing the outer edge shape of the laminated model in response to the input change instruction and displaying the modified profile of the laminated body on the display unit.
The method for setting the amount of surplus meat according to claim 1, further comprising. The method for setting a surplus thickness according to claim 1 or 2, wherein the welded bead is formed by melting the filler metal using an arc as a heat source. The laminated model designed by the method for setting the amount of surplus wall according to any one of claims 1 to 3 is laminated on the base plate by the welding bead, and the laminated model is separated from the base plate. , A method for manufacturing a modeled object to be processed into the structure having the target shape. It is a manufacturing device for a laminated model that forms a structure with a target shape by laminating and modeling a laminated model on a base plate using a welding bead formed by melting and solidifying a filler metal. hand,
A displacement amount calculation unit that predicts the amount of deformation due to the release strain of the laminated model that occurs when the laminated model is separated from the base plate.
A correction profile in which the target profile representing the outer edge of the target shape of the structure is corrected according to the displacement, which is the amount of deformation, in the direction opposite to the deformation due to the release strain is obtained, and the laminated model is obtained from the correction profile. A surplus wall amount setting unit that adjusts the laminate profile showing the outer edge shape of the laminated model so that the surplus wall amount to the outer edge falls within a predetermined reference range.
Equipment for manufacturing laminated objects.

Images