A method and apparatus for forming a part

Abstract

The application discloses a part forming method and device, and relates to the technical field of additive manufacturing, and aims to solve the problems of high additive manufacturing cost and easy edge warping and defects of existing parts with flanges. The part forming method comprises the following steps: obtaining a three-dimensional model of a part; determining a forming direction of the part according to the diameters of two flanges; constructing a support structure along the bottom edge of the top flange in the three-dimensional model according to the forming direction to obtain a machining model; the first edge of the support structure close to the pipe is at a first preset thickness from the top flange edge line, and the second edge of the support structure away from the pipe is at a second preset thickness from the top flange edge line; printing the part based on the machining model to obtain a printed part; and processing the printed part to obtain the part. The part forming method provided by the application is used for reducing the additive manufacturing cost of the part with the flanges and avoiding the edge warping and defects of the part.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and more particularly to a method and apparatus for forming parts. Background Technology

[0002] Selective laser melting (SLM) is a widely used and mature process. Based on the fundamental principles of rapid prototyping, this method employs a layer-by-layer additive manufacturing approach. According to the three-dimensional model of the part, the model is sliced ​​into layers of a specific thickness. Then, under the control of a CNC system, a laser, guided by a galvanometer, melts the metal powder, directly forming a part with a specific geometric shape. During SLM, the metal powder completely melts, resulting in a metallurgical bond. The formed parts exhibit high density and excellent microstructure, and the method can also form high-precision, complex, and irregularly shaped metal parts.

[0003] As selective laser melting (SLM) technology matures, its applications are expanding, and more and more new materials are being used. An increasing number of parts that traditional processes cannot produce are being manufactured using SLM. Current additive manufacturing methods typically involve adding numerous solid supports for filling or adding numerous non-solid supports to ensure the formation of suspended surface structures. However, such methods are costly and lack sufficient support strength. For parts including flanges, the large flange protrusions make the edges prone to warping and loss, leading to part deformation. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for forming parts, which reduces the cost of additive manufacturing of parts with flanges and avoids the occurrence of edge warping and missing parts.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a method for forming a part, comprising:

[0007] Obtain a three-dimensional model of the part; the part includes at least two flanges and a pipe fitting; the two flanges are connected by the pipe fitting;

[0008] The forming direction of the part is determined based on the diameters of the two flanges;

[0009] According to the forming direction, a support structure is constructed circumferentially along the bottom edge of the top flange in the three-dimensional model to obtain the processing model; the first edge of the support structure close to the pipe is at a distance of a first preset thickness from the edge line of the top flange, and the second edge of the support structure away from the pipe is at a distance of a second preset thickness from the edge line of the top flange; one end of the support structure is perpendicularly connected to the bottom edge of the top flange, and the other end of the support structure is inclinedly connected to the side wall of the pipe.

[0010] The part is printed based on the processing model to obtain a printed part;

[0011] The printed part is obtained by processing the printed part.

[0012] Compared with existing technologies, the part forming method provided by this invention involves obtaining a three-dimensional model of the part; determining the forming direction of the part based on the diameters of the two flanges; constructing a support structure circumferentially along the bottom edge of the top flange in the three-dimensional model according to the forming direction to obtain a processing model; the first edge of the support structure near the pipe is at a distance of a first preset thickness from the edge line of the top flange, and the second edge of the support structure away from the pipe is at a distance of a second preset thickness from the bottom edge of the top flange; one end of the support structure is perpendicularly connected to the bottom edge of the top flange, and the other end of the support structure is inclinedly connected to the side wall of the pipe; subsequent processing is performed to obtain the part. The support structure established in this part forming method is connected to the side wall of the pipe by an inclined manner at one end, effectively reducing the volume of the support structure and lowering printing costs. Simultaneously, the connection between the support structure and the part is perpendicular, providing vertical support for the part. The thickness of the support structure is bidirectionally offset, offset from the bottom edge of the top flange towards the pipe and offset away from the pipe, providing effective support for the edge of the top flange and avoiding protruding edge warping of the top flange.

[0013] Secondly, the present invention also provides a forming apparatus for a part, comprising:

[0014] A 3D model acquisition module is used to acquire a 3D model of a part; the part includes at least two flanges and a pipe fitting; the two flanges are connected by the pipe fitting.

[0015] A forming direction determination module is used to determine the forming direction of the part based on the diameters of the two flanges;

[0016] A support structure construction module is used to construct a support structure circumferentially along the bottom edge of the top flange in the three-dimensional model according to the forming direction, thereby obtaining a processing model; the first edge of the support structure near the pipe is at a distance of a first preset thickness from the edge line of the top flange, and the second edge of the support structure away from the pipe is at a distance of a second preset thickness from the edge line of the top flange; one end of the support structure is perpendicularly connected to the bottom edge of the top flange, and the other end of the support structure is inclinedly connected to the side wall of the pipe.

[0017] A printing module is used to print the part based on the machining model to obtain a printed part;

[0018] The processing module is used to process the printed material to obtain the part.

[0019] Compared with the prior art, the beneficial effects of the part forming apparatus provided by the present invention are the same as the beneficial effects of the part forming method described in the above technical solution. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A flowchart of a part forming method provided by the present invention;

[0022] Figure 2 A schematic diagram of a flanged part structure provided for this invention;

[0023] Figure 3 A schematic diagram of the supporting structure provided for the present invention;

[0024] Figure 4 This is a schematic diagram of the bidirectional offset support structure provided by the present invention;

[0025] Figure 5 This is a schematic diagram of the structure after constructing the first hollow structure provided by the present invention;

[0026] Figure 6 This is a schematic diagram of the structure after constructing the second hollow structure provided by the present invention;

[0027] Figure 7 This is a schematic diagram of a part forming device provided by the present invention.

[0028] Figure label:

[0029] 1-Top flange, 2-Ground flange, 3-Pipe fitting, 4-First support, 5-Second support, 6-Rounded corner structure, 7-First edge, 8-Second edge, 9-First hollow structure, 10-Second hollow structure. Detailed Implementation

[0030] To facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold and the second threshold are merely used to distinguish different thresholds and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" are not necessarily different.

[0031] It should be noted that in this invention, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0032] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0033] A flange, also called a flange plate or flange, is a part used to connect shafts to each other. It is used for connecting pipe ends and is also used on equipment inlets and outlets to connect two pieces of equipment. Existing flanges are usually connected to other structures by welding, requiring the flange and connecting pipe fittings to be manufactured separately. However, when manufacturing parts composed of flanges and pipe fittings using additive manufacturing methods, the flange has a large exposed surface area. Using large supports not only increases costs, but also makes the flange edges prone to warping and missing material, leading to part deformation.

[0034] To address the aforementioned problems, this invention provides a method and apparatus for forming parts, which ensures that the formed parts retain their original design, reduce deformation, save costs, shorten the cycle time, and guarantee accuracy. The following description is in conjunction with the accompanying drawings.

[0035] Figure 1 This invention provides a flowchart of a method for forming a part, as shown below. Figure 1 As shown, it includes:

[0036] Step 101: Obtain the 3D model of the part;

[0037] like Figure 2 As shown, the part includes at least a top flange 1, a bottom flange 2, and a pipe fitting 3; the two flanges are connected by the pipe fitting 3; the three-dimensional model of the part can be constructed in three-dimensional software based on the part's dimensional information.

[0038] Step 102: Determine the forming direction of the part based on the diameters of the two flanges;

[0039] If the two flanges in a part have different diameters, the flange with the larger diameter is selected as the bottom flange, and the flange with the smaller diameter is selected as the top flange. The direction from the flange with the larger diameter to the flange with the smaller diameter is the forming direction. If the two flanges have the same diameter, either one can be selected as the bottom flange, and the direction from the bottom flange to the other flange is the forming direction. Otherwise, the selection of the forming direction should be based on the principles of stability, minimal support, and short forming time, and should effectively control the shape of the part and reduce deformation. Forming directions are as follows: Figure 2 As shown, the two flanges have the same diameter, and their forming direction is from the bottom flange 2 to the top flange 1.

[0040] Step 103: Construct a support structure circumferentially along the bottom edge of the top flange in the three-dimensional model according to the forming direction to obtain the processing model; the support structure is a mesh support.

[0041] Because the top flange has a protruding surface, its edge will warp upwards during printing, resulting in a shortage at the lower surface edge. Furthermore, the protruding surface of the top flange will cause radial shrinkage during heat shrinkage of the part. If a solid support is added to the bottom of the top flange and placed directly on the ground, the support volume will be large, increasing both cost and printing time. If the support structure is tilted directly to the bottom edge of the top flange, it cannot fully compensate for the warping shortage. It is understood that the protruding surface is a suspended portion; therefore, one end of the support structure constructed in this invention is perpendicularly connected to the bottom edge of the top flange, and the other end is tilted to the side wall of the pipe fitting. For details, see... Figure 3The support structure includes a first support 4 and a second support 5. The first support 4 is a vertical curved surface, and the second support 5 is an inclined curved surface. One end of the first support 4 is perpendicularly connected to the bottom edge of the top flange, and the other end of the first support is connected to one end of the second support. The other end of the second support 5 is inclinedly connected to the pipe fitting. The angle between the second support and the vertical direction of the pipe fitting is less than or equal to 45 degrees. To reduce stress concentration and lower the risk of cracking, a rounded corner structure 6 is added at the connection between the first support 4 and the second support 5.

[0042] See Figure 4 The thickness of the support structure is bidirectionally offset. The distance between the first edge 7 of the support structure near the pipe fitting and the flange edge line of the top flange is a first preset thickness, while the distance between the second edge 8 of the support structure away from the pipe fitting and the flange edge line of the top flange is a second preset thickness. Offset away from the pipe fitting compensates for thermal shrinkage, while offset closer to the pipe fitting compensates for warping. This also reduces the contact thickness between the support structure and the solid, making removal easier. The second preset thickness must be greater than 0.5mm to effectively compensate for thermal shrinkage. It can be understood that the flange edge line refers to the vertical edge line of the flange.

[0043] Specifically, the construction method of the support structure includes: determining the cross-sectional centerline of the support structure according to the forming direction and the diameter of the top flange; the cross-sectional centerline includes a first centerline and a second centerline, the first centerline and the edge line of the top flange are on the same vertical line, and the second centerline connects the first centerline and the side wall of the pipe fitting; the first centerline is the centerline of the first support, and the second centerline is the centerline of the second support; after obtaining the cross-sectional centerline, a fillet can be added at the connection between the first centerline and the second centerline before offsetting;

[0044] The cross-section centerline is offset by the first preset thickness toward the pipe fitting, and then the cross-section centerline is offset by the second preset thickness away from the pipe fitting to obtain the cross-section.

[0045] The support structure is obtained by rotating the cross-section around the axis of the part.

[0046] Step 104: Print the part based on the machining model to obtain a printed part;

[0047] Specifically, the machining model containing the printing path is exported as an STL file, with both triangular and adjacent tolerances set to 0.0025mm. Then, the repair guide function in the repair software is used to repair the machining model without adding any additional auxiliary supports. The machining model is then sliced ​​to obtain multiple slice layers. Path filling is performed on these slice layers to obtain the printing path. The file containing the printing path is imported into the forming equipment, and laser selective melting forming technology is used to print the formed parts and support structures on the substrate in the forming equipment, resulting in a printed part. The surface and internal metal powder of the printed part are cleaned, and the printed part with the substrate undergoes heat treatment.

[0048] Step 105: Process the printed part to obtain the component.

[0049] Specifically, the printed part is first separated from the substrate by wire cutting; then the support structure in the printed part is removed to obtain the component.

[0050] The forming method of this part establishes a support structure, one end of which is connected to the side wall of the pipe by an incline, which effectively reduces the volume of the support structure and reduces printing costs. At the same time, the connection between the support structure and the part is a vertical connection, which can provide vertical support for the part. The thickness of the support structure adopts a bidirectional offset, offset from the bottom edge of the top flange towards the pipe and offset from the pipe, which can provide effective support for the edge of the top flange and avoid the protruding edge warping of the top flange.

[0051] As an optional approach, to further reduce costs, see [link to relevant documentation]. Figure 5 A first hollow structure 9 can be added circumferentially to the bottom side wall of the support structure. The first hollow structure has an opening. Since the support structure has a vertical curved surface, the grid support added inside is inclined outward. The first hollow structure can be heightened and its weight reduced. The first hollow structure can take various forms, such as round holes, rhombuses, and arches, which can effectively reduce support material consumption, reduce printing time, reduce the contact area with parts, reduce the difficulty of support removal, and facilitate powder cleaning.

[0052] See Figure 6 Furthermore, a second perforated structure 10 can be added along the circumference of the support structure at a preset height from the top flange to obtain a weight-reduced support structure. The preset height can be 1mm, and the second perforated structure 10 can be a conformal circular hole with a distance between adjacent holes greater than 2mm and less than 4mm. Adding the second perforated structure makes the support structure easier to remove from the part without affecting its strength.

[0053] As an optional approach, see Figure 3A rounded corner structure 6 can be constructed at the connection between the first and second supports in the weight-reduced support structure, and a rounded corner structure can also be constructed at the connection between the weight-reduced support structure and the part to obtain the machining model. Adding rounded corners can reduce stress concentration and lower the risk of part cracking.

[0054] The embodiments of the present invention can divide functional modules according to the above method examples. For example, each function can be divided into its own functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in the embodiments of the present invention is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0055] When dividing each function into modules according to its corresponding function. Figure 7 A schematic diagram of a part forming apparatus provided by the present invention is shown. Figure 7 As shown, the device includes:

[0056] The 3D model acquisition module 701 is used to acquire a 3D model of a part; the part includes at least two flanges and a pipe fitting; the two flanges are connected by the pipe fitting.

[0057] The forming direction determination module 702 is used to determine the forming direction of the part based on the diameters of the two flanges;

[0058] The support structure construction module 703 is used to construct a support structure circumferentially along the bottom edge of the top flange in the three-dimensional model according to the forming direction, thereby obtaining a processing model; the first edge of the support structure near the pipe is at a distance of a first preset thickness from the edge line of the top flange, and the second edge of the support structure away from the pipe is at a distance of a second preset thickness from the edge line of the top flange; one end of the support structure is perpendicularly connected to the bottom edge of the top flange, and the other end of the support structure is inclinedly connected to the side wall of the pipe.

[0059] The printing module 704 is used to print the part based on the machining model to obtain a printed part;

[0060] The processing module 705 is used to process the printed material to obtain the part.

[0061] Optionally, the support structure includes a first support and a second support, one end of the first support is perpendicularly connected to the bottom edge of the top flange, the other end of the first support is connected to one end of the second support, and the other end of the second support is obliquely connected to the pipe fitting.

[0062] Optionally, the support structure construction module 703 may include:

[0063] A section centerline determining unit is used to determine the section centerline of the support structure based on the forming direction and the diameter of the top flange; the section centerline includes a first centerline and a second centerline, the first centerline and the edge line of the top flange are on the same vertical line, and the second centerline connects the first centerline and the side wall of the pipe fitting; the first centerline is the centerline of the first support, and the second centerline is the centerline of the second support.

[0064] A profile determination unit is used to offset the profile centerline toward the pipe by a first preset thickness, and then offset the profile centerline away from the pipe by a second preset thickness to obtain a profile.

[0065] A profile rotation unit is used to rotate the profile around the axis of the part to obtain the support structure.

[0066] Optionally, the support structure construction module 703 may further include:

[0067] A first hollow structure building unit is used to add a first hollow structure circumferentially to the bottom sidewall of the support structure, the first hollow structure including an opening;

[0068] The second hollow structure building unit is used to add a second hollow structure along the circumference of the support structure at a preset height from the top flange to obtain a weight-reduced support structure.

[0069] Optionally, the support structure construction module 703 may further include:

[0070] A rounded corner structure building unit is used to build a rounded corner structure at the connection between the first support and the second support in the weight-reduced support structure;

[0071] A rounded corner structure is constructed at the connection between the weight-reduced support structure and the part to obtain a machining model.

[0072] Optionally, the angle between the second support and the vertical direction of the pipe is less than or equal to 45 degrees.

[0073] Optionally, the support structure is a grid support.

[0074] The forming device for the aforementioned part is a virtual device, comprising virtual units and virtual functional modules. This device is built on a forming equipment for use. At the same time, the forming device for a part provided by this invention corresponds to a forming method for a part and acts on the forming equipment.

[0075] The above mainly describes the solutions provided by the embodiments of the present invention from the perspective of the interaction between various modules. It is understood that, in order to achieve the above functions, it includes corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, in conjunction with the units and algorithm steps of the various examples described in the embodiments disclosed herein, the present invention can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0076] Although the invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, the disclosure, and the appended claims in carrying out the claimed invention. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0077] Although the invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely exemplary descriptions of the invention as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if such modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include such modifications and modifications.

Claims

1. A method for forming a part, characterized in that, include: Obtain a 3D model of the part; the part includes two flanges and a pipe fitting; the two flanges are a top flange and a bottom flange, and the top flange and the bottom flange are connected by the pipe fitting; The forming direction of the part is determined based on the diameters of the two flanges; If the two flanges in a part have different diameters, the flange with the larger diameter is selected as the bottom flange, and the flange with the smaller diameter is selected as the top flange. The direction from the bottom flange with the larger diameter to the top flange with the smaller diameter is the forming direction. If the two flanges have the same diameter, either one can be selected as the bottom flange, and the direction from the bottom flange to the other flange is the forming direction. According to the forming direction, a support structure is constructed circumferentially along the bottom edge of the top flange in the three-dimensional model to obtain the processing model; the first edge of the support structure near the pipe is at a distance of a first preset thickness from the edge line of the top flange, and the second edge of the support structure away from the pipe is at a distance of a second preset thickness from the edge line of the top flange; one end of the support structure is perpendicularly connected to the bottom edge of the top flange, and the other end of the support structure is inclinedly connected to the side wall of the pipe; the support structure includes a first support and a second support, one end of the first support is perpendicularly connected to the bottom edge of the top flange, the other end of the first support is connected to one end of the second support, and the other end of the second support is inclinedly connected to the pipe; The part is printed based on the processing model to obtain a printed part; The printed part is obtained by processing the printed part. The step of constructing a support structure circumferentially along the bottom edge of the top flange in the three-dimensional model according to the forming direction includes: The cross-sectional centerline of the support structure is determined according to the forming direction and the diameter of the top flange; the cross-sectional centerline includes a first centerline and a second centerline, the first centerline and the edge line of the top flange are on the same vertical line, and the second centerline connects the first centerline and the side wall of the pipe fitting; the first centerline is the centerline of the first support, and the second centerline is the centerline of the second support. The cross-section centerline is offset by the first preset thickness toward the pipe fitting, and then the cross-section centerline is offset by the second preset thickness away from the pipe fitting to obtain the cross-section. The support structure is obtained by rotating the cross-section around the axis of the part.

2. The forming method of the part according to claim 1, characterized in that, After obtaining the support structure, the process further includes: A first hollow structure is added circumferentially to the bottom sidewall of the support structure; A second hollow structure is added along the circumference of the support structure at a preset height from the top flange to obtain a weight-reduced support structure.

3. The forming method of the part according to claim 2, characterized in that, The weight-reduced support structure further includes: A rounded corner structure is constructed at the connection between the first support and the second support in the weight-reduced support structure; A rounded corner structure is constructed at the connection between the weight-reduced support structure and the part to obtain a machining model.

4. The forming method of the part according to claim 1, characterized in that, The angle between the second support and the vertical direction of the pipe is less than or equal to 45 degrees.

5. The forming method of the part according to claim 1, characterized in that, The support structure is a grid support.

6. The forming method of the part according to claim 1, characterized in that, The process of processing the printed part to obtain the component includes: The printed part is separated from the substrate by wire cutting; Remove the support structure from the printed part to obtain the component.

7. The forming method of the part according to claim 1, characterized in that, The process of printing the part based on the machining model to obtain a printed part includes: The processing model is sliced ​​to obtain multiple slice layers; Path filling is performed on multiple slice layers to obtain the printing path; The part is printed according to the printing path to obtain a printed part.

8. A forming apparatus for a part, characterized in that, include: A 3D model acquisition module is used to acquire a 3D model of a part; the part includes two flanges and a pipe fitting; the two flanges are a top flange and a bottom flange, and the top flange and the bottom flange are connected by the pipe fitting; A forming direction determination module is used to determine the forming direction of the part based on the diameters of the two flanges; If the two flanges in a part have different diameters, the flange with the larger diameter is selected as the bottom flange, and the flange with the smaller diameter is selected as the top flange. The direction from the bottom flange with the larger diameter to the top flange with the smaller diameter is the forming direction. If the two flanges have the same diameter, either one can be selected as the bottom flange, and the direction from the bottom flange to the other flange is the forming direction. A support structure construction module is used to construct a support structure circumferentially along the bottom edge of the top flange in the three-dimensional model according to the forming direction, thereby obtaining a processing model. The first edge of the support structure near the pipe is at a distance of a first preset thickness from the edge line of the top flange, and the second edge of the support structure away from the pipe is at a distance of a second preset thickness from the edge line of the top flange. One end of the support structure is perpendicularly connected to the bottom edge of the top flange, and the other end of the support structure is inclinedly connected to the side wall of the pipe. The support structure includes a first support and a second support. One end of the first support is perpendicularly connected to the bottom edge of the top flange, and the other end of the first support is connected to one end of the second support. The other end of the second support is inclinedly connected to the pipe. The supporting structure construction module includes: A section centerline determining unit is used to determine the section centerline of the support structure based on the forming direction and the diameter of the top flange; the section centerline includes a first centerline and a second centerline, the first centerline and the edge line of the top flange are on the same vertical line, and the second centerline connects the first centerline and the side wall of the pipe fitting; the first centerline is the centerline of the first support, and the second centerline is the centerline of the second support. A profile determination unit is used to offset the profile centerline toward the pipe by a first preset thickness, and then offset the profile centerline away from the pipe by a second preset thickness to obtain a profile. A profile rotation unit is used to rotate the profile around the axis of the part to obtain the support structure; A printing module is used to print the part based on the machining model to obtain a printed part; The processing module is used to process the printed material to obtain the part.

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