Shape information generation method and control information generation method

Abstract

To provide a shape information generating method that can easily generate shape information of a molding with an appropriate amount of an extra thickness added to each location, and a control information generating method.SOLUTION: A shape information generating method includes: an information acquisition process in which three-dimensional shape information of a target shape of a molding W is acquired; a data decomposition process in which a model Mw of the molding W created on the basis of the shape information is decomposed into a plurality of part models Mbl1 to Mbl3, Mca; an expansion / reduction process in which expansion processing or reduction processing is performed for each of the part models Mbl1 to Mbl3, Mca; a binding condition adjustment process in which an overlapping amount H of the part models Mbl1 to Mbl3, Mca is set; and a data binding process in which the part models Mbl1 to Mbl3, Mca are bound to each other on the basis of the overlapping amount H, where by shape information comprising the model Mw of the molding W, to which an amount obtained by subtracting the overlapping amount due to binding from a shape change amount due to expansion processing or the reduction processing is given as an extra thickness Pa, is generated.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a method for generating shape information and a method for generating control information.

Background Art

[0002] In recent years, the need for 3D printers as production means has been increasing, and in particular, research and development has been conducted for practical application in the aircraft industry and the like regarding the application to metal materials. A 3D printer using a metal material melts metal powder or metal wire using a heat source such as a laser or an arc, and stacks the molten metal to form a shaped object.

[0003] Patent Document 1 discloses a technique of defining a three-dimensional model of a workpiece product, creating a second data file consisting of a set of continuous relative spatial coordinates depicting the path of a tool in this three-dimensional model, and positioning a welding head with respect to a processing table so that the path of the second data file follows the relative movement to perform shaping.

[0004] In such layer forming, it is necessary to set some excess material for shaping in consideration of thermal deformation accompanying shaping or post-processing steps such as cutting and polishing.

[0005] Patent Document 2 discloses a technique of setting the amount of excess material by expanding according to the predicted thermal shrinkage amount representing the outer edge of the target shape of the shaped object to be shaped, and further deforming according to the predicted elastic deformation amount of the release strain due to machining.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] By the way, for a shaped object shaped by additive manufacturing, the smaller the amount of surplus material set, the shorter the lead time of post-processing such as cutting and polishing can be. However, if the amount of surplus material is reduced, the margin for coping with insufficient layer height during shaping and the like decreases. Also, if the amount of surplus material is increased, although there are advantages such as being able to relax complex shape portions where shaping is difficult, the burden in post-processing such as cutting and polishing increases.

[0008] Also, when trying to partially adjust the amount of surplus material of the shaped object, complex CAD editing is required, and mechanical or automatic processing becomes difficult.

[0009] Therefore, an object of the present invention is to provide a shape information generation method and a control information generation method capable of generating shape information of a shaped object to which an appropriate amount of surplus material is given for each location by simple processing.

Means for Solving the Problems

[0010] The present invention has the following configuration. (1) A shape information generation method for generating three-dimensional shape information of a shaped object to which surplus material required for processing is given, an information acquisition step of acquiring three-dimensional shape information of a target shape of the shaped object; a data decomposition step of decomposing a model of the shaped object created based on the shape information into a plurality of part models; an expansion / contraction step of performing an expansion process or a contraction process for each of the part models; a coupling condition adjustment step of setting an overlapping amount between the part models; a data coupling step of coupling the part models based on the overlapping amount, and generating shape information including a model of the shaped object to which the amount obtained by subtracting the overlapping amount accompanying the coupling from the shape change amount accompanying the expansion process or the contraction process is given as the surplus material; including a shape information generation method. (2) A slicing step of slicing a model of a shaped object based on the shape information generated by the shape information generation method described in (1) into layer shapes, and A control information generation step of decomposing the layer shape and generating control information for a laminated manufacturing apparatus including welding bead trajectory information, including A control information generation method.

Advantages of the Invention

[0011] According to the present invention, it is possible to generate shape information of a shaped object with an appropriate amount of surplus material added for each location by simple processing.

Brief Description of the Drawings

[0012]

Figure 1

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Figure 5A

Figure 5B

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Figure 5D

Figure 5E

Figure 5F

Figure 6A

Figure 6B

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The additive manufacturing system shown here melts a filler material (welding wire) held by a manipulator by a heat source device to form a welding bead, and repeatedly stacks the formed welding beads in a desired shape to form a shaped object formed by stacking the welding beads.

[0014] <Configuration of the Additive Manufacturing System> A configuration example of the above-described additive manufacturing system will be described. FIG. 1 is a schematic diagram showing the overall configuration of the additive manufacturing system. The additive manufacturing system 100 includes a shaping control device 15, a manipulator 17, a filler material supply device 19, a manipulator control device 21, and a heat source control device 23.

[0015] The manipulator control device 21 controls the manipulator 17 and the heat source control device 23. A controller (not shown) is connected to the manipulator control device 21, and any operation of the manipulator control device 21 can be instructed from an operator via the controller.

[0016] The manipulator 17 is, for example, an articulated robot, and a welding filler metal M is supported by a torch 11 provided at the tip axis so as to be continuously supplied. The torch 11 holds the welding filler metal M in a state of protruding from the tip. The position and orientation of the torch 11 can be arbitrarily set three-dimensionally within the range of the degrees of freedom of the robot arm constituting the manipulator 17. The manipulator 17 preferably has six or more degrees of freedom, and preferably can arbitrarily change the axial direction of the heat source at the tip. The manipulator 17 may be in various forms such as, in addition to the articulated robot with four or more axes shown in FIG. 1, a robot equipped with an angle adjustment mechanism on two or more orthogonal axes.

[0017] The torch 11 has a shield nozzle (not shown), and shield gas is supplied from the shield nozzle. The shield gas blocks the atmosphere, prevents oxidation, nitridation, etc. of the molten metal during welding, and suppresses welding defects. As the arc welding method used in this configuration, 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 may be used, and it is appropriately selected according to the shaping object. Here, gas metal arc welding will be described as an example. In the case of the consumable electrode type, a contact tip is arranged inside the shield nozzle, and the welding filler metal M to which current is supplied is held by the contact tip. The torch 11 generates an arc from the tip of the welding filler metal M in a shield gas atmosphere while holding the welding filler metal M.

[0018] The welding filler metal supply device 19 supplies the welding filler metal M toward the torch 11. The welding filler metal supply device 19 includes a reel 19a around which the welding filler metal M is wound, and a feeding mechanism 19b that feeds out the welding filler metal M from the reel 19a. The welding filler metal M is fed to the torch 11 while being sent in the forward or reverse direction as needed by the feeding mechanism 19b. The feeding mechanism 19b is not limited to the push type arranged on the welding filler metal supply device 19 side to extrude the welding filler metal M, and may be a pull type arranged on a robot arm or the like, or a push-pull type.

[0019] 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 during bead formation for melting and solidifying the filler material M. Further, in conjunction with welding conditions such as the welding current and welding voltage set by the heat source control device 23, the filler material supply rate of the filler material supply device 19 is adjusted.

[0020] The heat source for melting the filler material M is not limited to the above-described arc. For example, other heat source methods 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, etc. may be employed. When heating with an electron beam or a laser, the heating amount can be more finely controlled, the state of the bead to be formed can be maintained more appropriately, and it can contribute to further improvement in the quality of the laminated object. Also, the material of the filler material M is not particularly limited, and for example, depending on the characteristics of the shaped object W, the type of filler material M used may be different, such as mild steel, high-tensile steel, aluminum, aluminum alloy, nickel, nickel-based alloy, etc.

[0021] The shaping control device 15 controls the above-described respective parts in an overall manner.

[0022] The laminated shaping system 100 having the above-described configuration operates according to a shaping program created based on the shaping plan of the shaped object W. The shaping program is composed of a number of instruction codes and is created based on an appropriate algorithm according to various conditions such as the shape, material, and heat input amount of the shaped object. According to this shaping program, while moving the torch 11, when the supplied filler material M is melted and solidified, a linear welding bead that is a melt-solid of the filler material M is formed on the base material 13 which is the base. 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 shaping control device 15. The manipulator 17 moves the torch 11 while melting the filler material M with an arc according to a command from the manipulator control device 21 to form a welding bead. By sequentially forming and laminating the welding beads in this way, the shaped object W having the desired shape is obtained.

[0023] FIG. 2 is a functional block diagram of the shaping control device 15. The shaping control device 15 functions as a shape information generation device that generates shape information used when shaping the shaped object W. The shaping control device 15 includes an information acquisition unit 31, a data decomposition unit 33, an expansion / contraction unit 35, a coupling condition adjustment unit 37, and a data coupling unit 39.

[0024] The above-described shaping control device 15 is configured by hardware using an information processing device such as a PC (Personal Computer), for example. Each function of the shaping control device 15 is realized by a control unit (not shown) reading out a program having a specific function stored in a storage device (not shown) and executing the program. Examples of the storage device include a memory such as a RAM (Random Access Memory) which is a volatile storage area, a ROM (Read Only Memory) which is a non-volatile storage area, an HDD (Hard Disk Drive), an SSD (Solid State Drive), and the like. Examples of the control unit include a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processor Unit), or a dedicated circuit. In addition to the above-described form, the shaping control device 15 may be another computer remotely connected from the additive manufacturing system 100 via a network or the like.

[0025] <Shaped Object> Next, an example of the shaped object W shaped by the above-described additive manufacturing system 100 will be described. FIG. 3 is a perspective view of the shaped object W showing an example of the shaped object W.

[0026] As shown in FIG. 3, the shaped object W has a plurality of block portions BL1, BL2, and BL3. These block portions BL1, BL2, and BL3 are each formed in a rectangular parallelepiped shape. The block portion BL2 is stacked on the block portion BL1, and the block portion BL3 is stacked on the block portion BL2. And the block portion BL2 is joined to the block portion BL1, and the block portion BL3 is joined to the block portion BL2. Further, the shaped object W has a cavity portion CA that opens at the bottom of the shaped object W at its substantially central position.

[0027] This shaped object W is shaped by sequentially forming and stacking weld beads on the base material 13 by a layered manufacturing system 100 provided with a shape control device 15. At this time, the shaped object W is shaped in a state where surplus material is provided on the outer surface excluding the bottom surface installed on the base material 13 and the inner surface of the cavity portion CA. Then, the shaped object W with surplus material provided is machined on its outer surface and the inner surface of the cavity portion CA to form the target shape.

[0028] <Generation of Shape Information> Next, the generation process of the shape information used when shaping the above-shaped object W will be described. FIG. 4 is a flowchart showing the generation procedure of the shape information.

[0029] (Information Acquisition Step) The information acquisition unit 31 acquires three-dimensional shape information of the target shape of the shaped object W (step S1). This shape information is the three-dimensional shape information before the provision of surplus material in the shaped object W. As the shape information of this shaped object W, for example, it may be information of the shaped object W generated by commercially available CAD editing software or the like. Note that the shape information of the shaped object W may include information on the base material 13 on which the shaped object W is installed.

[0030] FIG. 5A is a schematic diagram showing a model Mw of the shaped object W created from the three-dimensional shape information of the target shape of the shaped object W. This model Mw is a model showing the shape of the shaped object W that is machined after layered manufacturing to obtain the target shape.

[0031] (Data Decomposition Step) The data decomposition unit 33 decomposes the model Mw of the modeled object W based on the acquired shape information of the three-dimensional shape into a plurality of part models (step S2).

[0032] Regarding the decomposition of the model Mw based on the acquired shape information of the three-dimensional shape, it may be decomposed into an arbitrary shape. For example, it is preferably decomposed into a solid part and a hollow part inside, and further, these parts are preferably decomposed as simple structures. Also, regarding the decomposed hollow part, it is preferably processed as a solid part once. Here, as the simple structure, for example, a structure having some symmetry such as a rectangular parallelepiped or a cylinder and having parameters (for example, height, width, radius, etc.) for expressing the figure determined in advance is preferable.

[0033] FIG. 5B is a schematic diagram showing the model Mw of the modeled object W obtained by decomposing the part model Mca of the cavity part CA. FIG. 5C is a schematic diagram showing the model Mw of the modeled object W decomposed into a plurality of part models Mbl1, Mbl2, Mbl3, Mca.

[0034] As shown in FIG. 5B, first, the cavity part CA, which is a hollow part, is decomposed from the model Mw of the modeled object W, and the decomposed hollow part, the cavity part CA, is made into a part model Mca composed of a solid part. Further, as shown in FIG. 5C, the model Mw of the modeled object W from which the cavity part CA has been separated is decomposed into simple rectangular parallelepiped block parts BL1, BL2, BL3, and these decomposed block parts BL1, BL2, BL3 are used as part models Mbl1, Mbl2, Mbl3.

[0035] (Expansion and contraction process) The expansion and contraction unit 35 performs an expansion process or a contraction process for each of the decomposed part models (step S3). This expansion process or contraction process may be performed uniformly, or a part of the range may be fixed and only the remaining range may be expanded or contracted. Further, only the frame part of the part model may be made thicker or thinner. Note that the part model forming the solid part is subjected to an expansion process, and the part model forming the hollow part is subjected to a contraction process.

[0036] FIG. 5D is a schematic diagram showing a model Mw of a shaped object W obtained by adding flash Pa to each of the part models Mbl1, Mbl2, Mbl3, and Mca. As shown in FIG. 5D, for the part models Mbl1, Mbl2, and Mbl3 that form solid parts, an inflation process is performed to add flash Pa to the outer periphery. For the part model Mca that forms a hollow part, a reduction process is performed to add flash Pa to the inner peripheral side.

[0037] (Combination condition adjustment step) The combination condition adjustment unit 37 sets the overlapping amount of the part models (step S4). This overlapping amount is the amount to be overlapped when combining the disassembled part models and restoring them to their original state. By adjusting this overlapping amount, even when flash is uniformly added around the part models, the flash amount can be partially changed. The overlapping amount may be specified by length or by volume.

[0038] FIG. 5E is a schematic diagram showing the overlapping amount H when overlapping the part models Mbl1 and Mbl2. As shown in FIG. 5E, when combining the part models Mbl1 and Mbl2, if the overlapping amount H is adjusted to be equal to or greater than the added flash width, the flash Pa at the joint between the part models Mbl1 and Mbl2 can be reduced or eliminated. Also, in the part model Mbl1 installed on the base material 13, the overlapping amount H at the boundary portion that is the installation surface where the part model Mbl1 contacts the base material 13 can be adjusted to reduce or eliminate the flash Pa.

[0039] Also, together with the adjustment of the overlapping amount H, the overlapping position may be separately adjusted. In this way, the flash Pa can be locally adjusted. For example, as shown in FIG. 5E, if the position of the part model Mbl2 to be combined with the part model Mbl1 is adjusted to be shifted to the right (in the direction of arrow X in FIG. 5E), the flash amount on the left side of the part model Mbl2 can be decreased and thinned, or the flash amount on the right side of the part model Mbl2 can be increased and thickened.

[0040] (Data combination step) The data combining unit 39 combines the part models based on the set overlapping amount and overlapping position, and generates shape information of the model Mw of the shaped object W to which the amount obtained by subtracting the overlapping amount associated with the combination from the amount of shape change associated with the expansion process or the reduction process in the expansion and contraction process is given as the surplus flesh Pa (step S5).

[0041] FIG. 5F is a model Mw of the shaped object W obtained by combining the part models Mbl1, Mbl2, Mbl3, and Mca based on the set overlapping amount and overlapping position. As shown in FIG. 5F, by combining the part models Mbl1, Mbl2, Mbl3, and Mca based on the set overlapping amount and overlapping position, shape information is generated in which the amount obtained by subtracting the overlapping amount associated with the combination from the amount of shape change associated with the expansion process or the reduction process in the expansion and contraction process is given as the surplus flesh Pa. Specifically, a model Mw, which is shape information of the shaped object W to which the surplus flesh Pa is given on the outer peripheral side and the inner peripheral side of the cavity CA with respect to the target shape (the shape indicated by the two-dot chain line in FIG. 5F), is generated. Also, regarding the joints of the respective part models Mbl1, Mbl2, Mbl3, the surplus flesh amount adjusted by the amount of overlapping is reflected. In this way, the surplus flesh amount suitable for each location, such as the outer periphery, the inner periphery of the cavity CA, the joints of the part models Mbl1, Mbl2, Mbl3, and the bottom surface that is the installation surface on the base material 13 in the part model Mbl1, can be set by only a simple operation.

[0042] As described above, according to the shape information generation method according to this configuration example, after decomposing the model Mw of the shaped object W into the part models Mbl1, Mbl2, Mbl3, and Mca, an expansion process or a reduction process is performed for each of the part models Mbl1, Mbl2, Mbl3, and Mca to give the surplus flesh Pa respectively, and by combining them with the set overlapping amount H, the model Mw, which is three-dimensional shape information to which the surplus flesh Pa is given, can be generated. That is, an appropriate amount of surplus flesh Pa can be flexibly given for each location by relatively simple processes such as decomposition, expansion, reduction, and combination, without adding a specific surface, line, point, or the like to the model Mw of the shaped object W.

[0043] <Generation of Control Information> Next, a case will be described in which control information used when the additive manufacturing system 100 forms the object W is generated based on the shape information of the object W generated by the above-described shape information generation method. FIG. 6A is a schematic diagram of a model Mw of the object W divided into a plurality of regions Abl1, Abl2, and Abl3. FIG. 6B is a schematic diagram of the model Mw in which each region Abl1, Abl2, and Abl3 is sliced into layer shapes.

[0044] (Division Step) As shown in FIG. 6A, the model Mw of the object W based on the generated shape information is divided into a plurality of regions. As the regions to be divided, it is preferable to divide them into simple structures as in the above-described data decomposition step. For example, the model Mw of the object W based on the generated shape information is divided into regions Abl1, Abl2, and Abl3 of simple rectangular parallelepiped block portions BL1, BL2, and BL3.

[0045] (Slicing Step) As shown in FIG. 6B, each of the divided regions Abl1, Abl2, and Abl3 of the model Mw of the object W is sliced into layer shapes. Specifically, each of the regions Abl1, Abl2, and Abl3 of the block portions BL1, BL2, and BL3 is sliced by a plane orthogonal to the stacking direction of the welding beads and divided into a plurality of bead layers L. Then, this bead layer L is decomposed so as to correspond to the bead shape of the welding bead, and for example, a trapezoidal bead model that is a simple geometric figure is created. And control information including the trajectory information of the welding bead is generated.

[0046] In this configuration example, an appropriate amount of extra material Pa is given to the model Mw of the object W in advance. Therefore, by slicing and decomposing the model Mw of the object W into layer shapes, it is possible to generate the control information used in the additive manufacturing system 100 while omitting complicated processes such as adding welding beads or extending the length of the welding beads to give extra material to each welding bead.

[0047] Moreover, even if the model Mw of the modeled object W based on the generated shape information is divided into the regions Abl1, Abl2, and Abl3 of the plurality of block portions BL1, BL2, and BL3, appropriate surplus material Pa is provided for each of the regions Abl1, Abl2, and Abl3. Therefore, control information capable of modeling the modeled object W having the target shape can be generated.

[0048] As described above, the present invention is not limited to the above-described embodiments, and it is also contemplated by the present invention that those skilled in the art can make changes and applications based on combining each configuration of the embodiments with each other, the description of the specification, and well-known techniques, and these are included in the scope for which protection is sought.

[0049] As described above, the following matters are disclosed in this specification. (1) A shape information generation method for generating three-dimensional shape information of a modeled object to which surplus material required for processing is provided, an information acquisition step of acquiring three-dimensional shape information of the target shape of the modeled object; a data decomposition step of decomposing a model of the modeled object created based on the shape information into a plurality of part models; an expansion / contraction step of performing an expansion process or a contraction process for each of the part models; a coupling condition adjustment step of setting an overlapping amount between the part models; a data coupling step of generating shape information including a model of the modeled object to which the surplus material is provided by coupling the part models based on the overlapping amount, the amount obtained by subtracting the overlapping amount associated with the coupling from the amount of shape change associated with the expansion process or the contraction process; A shape information generation method including the above. According to this shape information generation method, after decomposing into part models, an expansion process or a contraction process is performed for each of the part models to provide surplus material respectively, and by coupling with the set overlapping amount, three-dimensional shape information with surplus material can be generated. That is, for the model of the modeled object, an appropriate amount of surplus material can be flexibly provided for each location by relatively simple processes such as decomposition, expansion, contraction, and coupling without adding specific surfaces, lines, points, etc.

[0050] (2) In the expansion and contraction process, the parts model of the solid part of the shaped object is expanded, and the parts model of the hollow part of the shaped object is contracted. The shape information generation method according to (1). According to this shape information generation method, machining allowance can be favorably imparted to the outer surface of the solid part and the inner surface of the hollow part of the shaped object, respectively.

[0051] (3) In the bonding condition adjustment process, further perform adjustment processing on the overlapping position of the parts models. In the data bonding process, bond the parts models based on the overlapping amount and the overlapping position. The shape information generation method according to (1) or (2). According to this shape information generation method, since the overlapping position is adjusted, the allowance amount can be unevenly distributed to make the allowance partially thinner or thicker, and the degree of freedom in local allowance design is improved.

[0052] (4) In the bonding condition adjustment process, make the overlapping amount equal to or greater than the allowance width imparted to the parts model. The shape information generation method according to any one of (1) to (3). According to this shape information generation method, among the allowances uniformly imparted around the parts model, for example, at the joint part or the installation part on the base material, the allowance can be efficiently reduced or eliminated.

[0053] (5) A slicing process of slicing the model of the shaped object based on the shape information generated by the shape information generation method according to any one of (1) to (4) into a layer shape, and A control information generation process of decomposing the layer shape to generate control information for a laminated manufacturing apparatus including the trajectory information of the welding bead. Including A control information generation method. According to this control information generation method, an appropriate amount of surplus material is given to the model of the object to be formed, which is the control information used when forming the object with a layered manufacturing apparatus. Therefore, by slicing and decomposing the model of this object to be formed into layer shapes, it is possible to generate the control information used in the layered manufacturing apparatus while omitting complicated processes such as adding welding beads or extending the length of welding beads to give surplus material.

[0054] (6) Further including a dividing step of dividing the model of the object to be formed based on the generated shape information into a plurality of regions before the slicing step, In the slicing step, slicing the divided regions into the layer shapes, The control information generation method according to (5), wherein in the control information generation step, the layer shape is decomposed to generate control information including the trajectory information of the welding bead. According to this control information generation apparatus, even if the model of the object to be formed based on the generated shape information is divided into a plurality of regions, an appropriate amount of surplus material is given to each region. Therefore, it is possible to generate control information capable of forming an object of the target shape while omitting complicated processes such as locally adding welding beads or extending the length of welding beads.

Explanation of Signs

[0055] 31 Information acquisition unit 33 Data decomposition unit 35 Expansion and contraction unit 37 Bonding condition adjustment unit 39 Data bonding unit 100 Layered manufacturing system (layered manufacturing apparatus) Abl1, Abl2, Abl3 Regions H Overlap amount Mbl1, Mbl2, Mbl3, Mca Part models Mw Model Pa Surplus material W Object to be formed

Claims

1. A shape information generation method for generating three-dimensional shape information of a shaped object with surplus material required for processing, comprising: an information acquisition step of acquiring three-dimensional shape information of a target shape of the shaped object; a data decomposition step of decomposing a model of the shaped object created based on the shape information into a plurality of part models; an expansion / contraction step of performing an expansion process or a contraction process for each of the part models; a joining condition adjustment step of setting an overlapping amount between the part models; a data joining step of joining the part models based on the overlapping amount, and generating shape information composed of a model of the shaped object with the amount obtained by subtracting the overlapping amount associated with the joining from the amount of shape change associated with the expansion process or the contraction process being provided as the surplus material; and a shape information generation method.

2. In the expansion / contraction step, expanding the part model of the solid part of the shaped object and contracting the part model of the hollow part of the shaped object. The shape information generation method according to Claim 1.

3. In the joining condition adjustment step, further performing an adjustment process for the overlapping position between the part models, and in the data joining step, joining the part models based on the overlapping amount and the overlapping position. The shape information generation method according to Claim 1.

4. In the joining condition adjustment step, setting the overlapping amount to be equal to or greater than the surplus material width applied to the part model. The shape information generation method according to Claim 1.

5. A control information generation method, comprising: a slicing step of slicing a model of a shaped object based on the shape information generated by the shape information generation method according to any one of Claims 1 to 4 into a layer shape; and a control information generation step of decomposing the layer shape to generate control information for a laminated manufacturing apparatus including trajectory information of a welding bead.

6. Before the slicing step, further comprising a dividing step of dividing a model of a shaped object based on the generated shape information into a plurality of regions, in the slicing step, slicing the divided regions into the layer shape, and in the control information generation step, decomposing the layer shape to generate control information including trajectory information of the welding bead. The control information generation method according to Claim 5.

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