A fuse additive manufacturing lattice rudder cross node heat control and path planning method

Abstract

The application relates to the field of additive manufacturing, and provides a fused filament additive manufacturing grid rudder intersection node heat control and path planning method, S1: printing a first layer; S1.1: printing an outer frame: the outer frame is printed in a continuous printing mode without stopping from a starting point to an ending point, and the starting point and the ending point are located at the same position; S1.2: printing a plurality of first-direction grid walls on the outer frame; S1.2.1: printing a first first-direction grid wall, including printing a front half first-direction grid wall and printing a rear half first-direction grid wall; the front half first-direction grid wall is printed in the following manner: the starting point of printing is located at the center of the first-direction grid wall, the printing direction is towards the outer frame, and the printing is stopped until the formed first-direction grid wall intersects with the outer frame. The application can effectively reduce heat accumulation in the intersection node area in the process of fused filament additive manufacturing grid rudder, and can reduce problems such as over-deposition, high height bulging, thermal cracks and residual stress concentration.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, specifically to a method for thermal control and path planning of grid rudder cross nodes in fused wire additive manufacturing. Background Technology

[0002] The grid rudder contains a large number of thin-walled grids that intersect in a grid pattern or diamond shape (such as...). Figure 1 As shown), fused wire additive manufacturing (including plasma beam fused wire additive manufacturing, arc fused wire additive manufacturing, and electron beam fused wire additive manufacturing) is very suitable for forming large grid rudder blanks due to its high deposition efficiency and low cost.

[0003] In traditional fused wire additive manufacturing, the welding torch passes through the mesh intersections multiple times, causing a rapid and intense accumulation of heat in the nodal areas, leading to the following problems: The molten pool overheats and collapses, with abrupt changes in local wall thickness and height (over-deposition and high bulging). The nodes are characterized by coarse grains, hot cracks, and severe residual stress concentration. This increases the impact of tools on subsequent precision milling and causes uneven machining allowance. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention aims to provide a method for thermal control and path planning of grid rudder cross nodes in fused wire additive manufacturing. To solve these problems, this invention employs the following technical solution: A method for thermal control and path planning of fused wire additive manufacturing grid rudder cross nodes includes the following steps: S1: Print the first layer; S1.1: Print the outer frame: Print the outer frame using a continuous printing method from the start point to the end point without pausing, with the start and end point positions being the same; S1.2: Print multiple first-direction grid walls on the outer frame; S1.2.1: Print the first first-direction grid wall, including printing the first half of the first-direction grid wall and printing the second half of the first-direction grid wall; The printing of the first half of the first direction grid wall includes: the printing starting point is at the center of the first direction grid wall, the printing direction is towards the outer frame, and the printing continues until the formed first direction grid wall intersects with the outer frame; The printing of the second half of the first direction grid wall includes: the printing starting point is the same as the printing starting point of the first half of the first direction grid wall, the printing direction is opposite to the printing direction of the first half of the first direction grid wall, and the printing is completed until the formed first direction grid wall intersects with the outer frame; When the formed first-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed first-direction grid wall and the outer frame; The first half of the first-direction grid wall and the second half of the first-direction grid wall form the first first-direction grid wall; S1.2.2: Print other first-direction grid walls, using the same printing method as S1.2.1, to form other first-direction grid walls; S1.3: Print multiple second-direction grid walls on the outer frame; S1.3.1: Print the first second-direction grid wall, including printing the first half of the second-direction grid wall and printing the second half of the second-direction grid wall; Printing the first half of the second-direction grid wall includes: the printing starting point and the printing starting point of the first half of the first-direction grid wall are not at the same vertical projection position, the printing direction is towards the outer frame, and the printing is completed until the formed second-direction grid wall intersects with the outer frame; The printing of the second-direction grid wall in the latter half includes: the printing starting point is the same as that of the first half of the second-direction grid wall, the printing direction is opposite to that of the first half of the second-direction grid wall, and the printing continues until the formed second-direction grid wall intersects with the outer frame; When the formed second-direction grid wall and the first-direction grid wall are close to intersecting, the second parameter control method is used to connect the formed second-direction grid wall and the first-direction grid wall; When the formed second-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed second-direction grid wall and the outer frame; The first half of the second-direction grid wall and the second half of the second-direction grid wall form the first second-direction grid wall; S1.3.2: Print other second-direction grid walls, using the same printing method as S1.3.1, to form other second-direction grid walls; S2: Print the next layer; S2.1: Printing the outer frame: The starting point and the printing starting point of the first layer outer frame are not at the same vertical projection position. The outer frame is printed in a continuous printing method from the starting point to the ending point without pausing. The starting point and the ending point are at the same position. S2.2: Print multiple second-direction grid walls on the outer frame; S2.2.1: Print the first second-direction grid wall, including printing the first half of the second-direction grid wall and printing the second half of the second-direction grid wall; The printing of the first half of the second-direction grid wall includes: the printing starting point is at the center of the second-direction grid wall, the printing direction is towards the outer frame, and the printing continues until the formed second-direction grid wall intersects with the outer frame; The printing of the second-direction grid wall in the latter half includes: the printing starting point is the same as the printing starting point of the first half of the second-direction grid wall, the printing direction is opposite to the printing direction of the first half of the second-direction grid wall, and the printing continues until the formed second-direction grid wall intersects with the outer frame; When the formed second-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed second-direction grid wall and the outer frame; The first half of the second-direction grid wall and the second half of the second-direction grid wall form the first second-direction grid wall; S2.2.2: Print other second-direction grid walls, using the same printing method as S2.2.1, to form other second-direction grid walls; S2.3: Print multiple first-direction grid walls on the outer frame; S2.3.1: Print the first first-direction grid wall, including printing the first half of the first-direction grid wall and printing the second half of the first-direction grid wall; The printing of the first half of the first direction grid wall includes: the printing start point and the printing start point of the second half of the first direction grid wall are not at the same vertical projection position, the printing direction is towards the outer frame, and the printing is completed until the formed first direction grid wall intersects with the outer frame; The printing of the second half of the first direction grid wall includes: the printing starting point is the same as that of the first half of the first direction grid wall, the printing direction is opposite to that of the first half of the first direction grid wall, and the printing continues until the formed first direction grid wall intersects with the outer frame; When the formed first-direction grid wall and the second-direction grid wall are close to intersecting, the second parameter control method is used to connect the formed first-direction grid wall and the second-direction grid wall. When the formed first-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed first-direction grid wall and the outer frame; The first half of the first-direction grid wall and the second half of the first-direction grid wall form the first first-direction grid wall; S2.3.2: Print other first-direction grid walls, using the same printing method as S2.3.1, to form other first-direction grid walls; S3: Odd-numbered layers are printed using method S1, and even-numbered layers are printed using method S2.

[0005] Optionally, the first parameter control method includes: When the distance between the welding torch position and the center point of the outer frame is w, the wire feeding is paused, and the welding current of the welding torch is gradually reduced to the first current threshold. The arc is extinguished when the grid wall reaches the intersection with the outer frame. w represents the thickness of the outer frame.

[0006] Optionally, the first current threshold is 50% of the original current value.

[0007] Optionally, the arc extinguishing is a gradual process.

[0008] Optionally, the second parameter control method includes: when the distance between the welding torch position and the center point of the formed grid wall is t, the wire feeding is paused, and the welding current of the welding torch is gradually reduced to the second current threshold. Then the welding current is maintained at the second current threshold, the welding torch moving speed remains unchanged, and when the position of the welding torch moves to the edge of the formed grid wall, the current is increased and the wire feeding begins to ensure the bonding performance at the intersection. t represents the wall thickness of the formed grid wall.

[0009] Optionally, the second current threshold is 50% of the original current value.

[0010] Optionally, the second parameter control method includes: when the distance between the welding torch position and the center point of the formed grid wall is t, the welding torch moving speed is accelerated to a speed threshold, and when the welding torch position moves to the edge of the formed grid wall, the original speed is restored; t represents the wall thickness of the formed grid wall.

[0011] Optionally, the speed threshold is 2-3 times the original moving speed of the welding torch.

[0012] Optionally, the starting points of the print outlines for odd-numbered layers and even-numbered layers are located on different axes.

[0013] Optionally, the welding torch is connected to an argon gas blowing device.

[0014] Optionally, an infrared camera is connected to the welding torch.

[0015] The present invention has the following beneficial effects: In summary, this invention can effectively reduce heat accumulation in the cross-node region during the fused wire additive manufacturing of grid fins, reduce problems such as over-deposition, high bulge, thermal cracking, and residual stress concentration, improve the forming accuracy, surface quality, and overall performance of grid fin structures, and enhance the reliability and applicability of additive manufacturing of large, complex, thin-walled grid structures. Attached Figure Description

[0016] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the grid fin structure in existing technology; Figure 2 This is a flowchart illustrating the steps of printing odd-numbered layers in this invention; Figure 3 This is a flowchart illustrating the steps of printing even-numbered layers in this invention; Figure 4 This is a schematic diagram of the structure of w in this invention; Figure 5 This is a schematic diagram of the structure of t in this invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] A method for thermal control and path planning of fused wire additive manufacturing grid rudder cross nodes includes the following steps: refer to Figure 2 S1: Print the first layer; S1.1: Print the outer frame: Print the outer frame using a continuous printing method from the start point to the end point without pausing, with the start and end point positions being the same; S1.2: Print multiple first-direction grid walls on the outer frame; S1.2.1: Print the first first-direction grid wall, including printing the first half of the first-direction grid wall and printing the second half of the first-direction grid wall; The printing of the first half of the first direction grid wall includes: the printing starting point is at the center of the first direction grid wall, the printing direction is towards the outer frame, and the printing continues until the formed first direction grid wall intersects with the outer frame; The printing of the second half of the first direction grid wall includes: the printing starting point is the same as the printing starting point of the first half of the first direction grid wall, the printing direction is opposite to the printing direction of the first half of the first direction grid wall, and the printing is completed until the formed first direction grid wall intersects with the outer frame; When the formed first-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed first-direction grid wall and the outer frame; The first half of the first-direction grid wall and the second half of the first-direction grid wall form the first first-direction grid wall; S1.2.2: Print other first-direction grid walls, using the same printing method as S1.2.1, to form other first-direction grid walls; S1.3: Print multiple second-direction grid walls on the outer frame; S1.3.1: Print the first second-direction grid wall, including printing the first half of the second-direction grid wall and printing the second half of the second-direction grid wall; Printing the first half of the second-direction grid wall includes: the printing starting point and the printing starting point of the first half of the first-direction grid wall are not at the same vertical projection position, the printing direction is towards the outer frame, and the printing is completed until the formed second-direction grid wall intersects with the outer frame; The printing of the second-direction grid wall in the latter half includes: the printing starting point is the same as that of the first half of the second-direction grid wall, the printing direction is opposite to that of the first half of the second-direction grid wall, and the printing continues until the formed second-direction grid wall intersects with the outer frame; When the formed second-direction grid wall and the first-direction grid wall are close to intersecting, the second parameter control method is used to connect the formed second-direction grid wall and the first-direction grid wall; When the formed second-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed second-direction grid wall and the outer frame; The first half of the second-direction grid wall and the second half of the second-direction grid wall form the first second-direction grid wall; S1.3.2: Print other second-direction grid walls, using the same printing method as S1.3.1, to form other second-direction grid walls; S2: Print the next layer; S2.1: Printing the outer frame: The starting point and the printing starting point of the first layer outer frame are not at the same vertical projection position. The outer frame is printed in a continuous printing method from the starting point to the ending point without pausing. The starting point and the ending point are at the same position. S2.2: Print multiple second-direction grid walls on the outer frame; S2.2.1: Print the first second-direction grid wall, including printing the first half of the second-direction grid wall and printing the second half of the second-direction grid wall; The printing of the first half of the second-direction grid wall includes: the printing starting point is at the center of the second-direction grid wall, the printing direction is towards the outer frame, and the printing continues until the formed second-direction grid wall intersects with the outer frame; The printing of the second-direction grid wall in the latter half includes: the printing starting point is the same as the printing starting point of the first half of the second-direction grid wall, the printing direction is opposite to the printing direction of the first half of the second-direction grid wall, and the printing continues until the formed second-direction grid wall intersects with the outer frame; When the formed second-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed second-direction grid wall and the outer frame; The first half of the second-direction grid wall and the second half of the second-direction grid wall form the first second-direction grid wall; S2.2.2: Print other second-direction grid walls, using the same printing method as S2.2.1, to form other second-direction grid walls; S2.3: Print multiple first-direction grid walls on the outer frame; S2.3.1: Print the first first-direction grid wall, including printing the first half of the first-direction grid wall and printing the second half of the first-direction grid wall; The printing of the first half of the first direction grid wall includes: the printing start point and the printing start point of the second half of the first direction grid wall are not at the same vertical projection position, the printing direction is towards the outer frame, and the printing is completed until the formed first direction grid wall intersects with the outer frame; The printing of the second half of the first direction grid wall includes: the printing starting point is the same as that of the first half of the first direction grid wall, the printing direction is opposite to that of the first half of the first direction grid wall, and the printing continues until the formed first direction grid wall intersects with the outer frame; When the formed first-direction grid wall and the second-direction grid wall are close to intersecting, the second parameter control method is used to connect the formed first-direction grid wall and the second-direction grid wall. When the formed first-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed first-direction grid wall and the outer frame; The first half of the first-direction grid wall and the second half of the first-direction grid wall form the first first-direction grid wall; S2.3.2: Print other first-direction grid walls, using the same printing method as S2.3.1, to form other first-direction grid walls; S3: Odd-numbered layers are printed using method S1, and even-numbered layers are printed using method S2.

[0022] The starting points of the printed outer frames for odd-numbered layers and even-numbered layers are not located at the same vertical projection position. This staggers the arc-starting and arc-ending positions during the printing of adjacent outer frames, preventing the arc-starting and arc-ending areas from continuously overlapping at the same location. This reduces localized repetitive heat input and heat accumulation, minimizing material buildup, height bulges, microstructure coarsening, and stress concentration caused by overheating in these areas. It also improves the circumferential uniformity of the outer frame forming and the stability of interlayer connections, thereby enhancing the overall forming quality of the grid fins.

[0023] like Figure 4 As shown, in an optional embodiment of the present invention, the first parameter control method includes: When the distance between the welding torch position and the center point of the outer frame is w, the wire feeding is paused (because there is also a part of the melt at the leading edge of the molten pool, which can ensure good bonding), and at the same time the welding current of the welding torch is gradually reduced to the first current threshold. The arc is extinguished when the grid wall reaches the intersection with the outer frame. w represents the thickness of the outer frame.

[0024] Furthermore, the first current threshold is 50% of the original current value.

[0025] Furthermore, the arc extinguishing is a gradual process.

[0026] like Figure 5 As shown, in an optional embodiment of the present invention, the second parameter control method includes: when the distance between the welding torch position and the center point of the formed grid wall is t, the wire feeding is paused, and the welding current of the welding torch is gradually reduced to a second current threshold. Then the welding current is maintained at the second current threshold, the welding torch moving speed remains unchanged, and when the position of the welding torch moves to the edge of the formed grid wall, the current is increased and the wire feeding begins to ensure the bonding performance at the intersection. t represents the wall thickness of the formed grid wall.

[0027] Furthermore, the second current threshold is 50% of the original current value.

[0028] like Figure 5 As shown, in an optional embodiment of the present invention, the second parameter control method includes: when the distance between the welding torch position and the center point of the formed grid wall is t, the welding torch moving speed is accelerated to a speed threshold, and when the welding torch position moves to the edge of the formed grid wall, the original speed is restored; t represents the wall thickness of the formed grid wall.

[0029] Furthermore, the speed threshold is 2-3 times the original moving speed of the welding torch.

[0030] Preferred configuration: An argon gas blowing device is connected to the welding torch. An infrared camera is also connected to the welding torch.

[0031] Beneficial effects of this invention: This invention achieves coordinated control of the printing path and the heat input process at the intersection nodes during the grid finned wire additive manufacturing process. After printing the outer frame, the first direction grid wall and the second direction grid wall are alternately formed. By using different printing sequences for odd and even layers, heat is continuously superimposed at the intersection node positions in adjacent layers, thereby reducing heat accumulation in the intersection node area and improving the overall forming stability of the grid structure.

[0032] Meanwhile, the present invention sets a parameterized thermal control method at the connection position between the grid wall and the outer frame and at the intersection position of the grid walls in different directions. By pausing wire feeding, reducing welding current or adjusting the moving speed of the welding gun when it approaches the connection area, the heat input of the intersection node area is effectively regulated, avoiding molten pool collapse, over-deposition of material and sudden change in node height caused by local heat concentration, thereby improving the dimensional consistency and surface forming quality of the grid rudder intersection node.

[0033] This invention achieves a smooth transition connection between the grid wall and the outer frame or adjacent grid walls by gradually reducing the welding current and gradually extinguishing the arc, thereby reducing defects caused by sudden arc interruption and improving the connection strength and structural reliability of the nodes.

[0034] During the cross-connection process between the second-direction grid wall and the already formed first-direction grid wall, by reducing the current and maintaining the moving speed when approaching the cross area, and restoring the current and refeeding the wire after the welding torch moves to the bonding area, it is possible to reduce the heat input in the cross area while ensuring the bonding performance between grid walls of different directions and improving the mechanical properties of the cross node.

[0035] Furthermore, this invention uses an argon gas blowing device to assist in cooling the forming area and an infrared camera to monitor the temperature during the printing process, which helps to further improve the temperature control accuracy of the additive manufacturing process and achieve stable control of the printing process of complex thin-walled grid rudder structures.

[0036] In summary, this invention can effectively reduce heat accumulation in the cross-node region during the fused wire additive manufacturing of grid fins, reduce problems such as over-deposition, high bulge, thermal cracking, and residual stress concentration, improve the forming accuracy, surface quality, and overall performance of grid fin structures, and enhance the reliability and applicability of additive manufacturing of large, complex, thin-walled grid structures.

[0037] The components, modules, mechanisms, and devices in this invention that are not described in detail are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for thermal control and path planning of fused wire additive manufacturing grid rudder cross nodes, characterized in that, Includes the following steps: S1: Print the first layer; S1.1: Print the outer frame: Print the outer frame using a continuous printing method from the start point to the end point without pausing, with the start and end point positions being the same; S1.2: Print multiple first-direction grid walls on the outer frame; S1.2.1: Print the first first-direction grid wall, including printing the first half of the first-direction grid wall and printing the second half of the first-direction grid wall; The printing of the first half of the first direction grid wall includes: the printing starting point is at the center of the first direction grid wall, the printing direction is towards the outer frame, and the printing continues until the formed first direction grid wall intersects with the outer frame; The printing of the second half of the first direction grid wall includes: the printing starting point is the same as the printing starting point of the first half of the first direction grid wall, the printing direction is opposite to the printing direction of the first half of the first direction grid wall, and the printing is completed until the formed first direction grid wall intersects with the outer frame; When the formed first-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed first-direction grid wall and the outer frame; The first half of the first-direction grid wall and the second half of the first-direction grid wall form the first first-direction grid wall; S1.2.2: Print other first-direction grid walls, using the same printing method as S1.2.1, to form other first-direction grid walls; S1.3: Print multiple second-direction grid walls on the outer frame; S1.3.1: Print the first second-direction grid wall, including printing the first half of the second-direction grid wall and printing the second half of the second-direction grid wall; Printing the first half of the second-direction grid wall includes: the printing starting point and the printing starting point of the first half of the first-direction grid wall are not at the same vertical projection position, the printing direction is towards the outer frame, and the printing is completed until the formed second-direction grid wall intersects with the outer frame; The printing of the second-direction grid wall in the latter half includes: the printing starting point is the same as that of the first half of the second-direction grid wall, the printing direction is opposite to that of the first half of the second-direction grid wall, and the printing continues until the formed second-direction grid wall intersects with the outer frame; When the formed second-direction grid wall and the first-direction grid wall are close to intersecting, the second parameter control method is used to connect the formed second-direction grid wall and the first-direction grid wall; When the formed second-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed second-direction grid wall and the outer frame; The first half of the second-direction grid wall and the second half of the second-direction grid wall form the first second-direction grid wall; S1.3.2: Print other second-direction grid walls, using the same printing method as S1.3.1, to form other second-direction grid walls; S2: Print the next layer; S2.1: Printing the outer frame: The starting point and the printing starting point of the first layer outer frame are not at the same vertical projection position. The outer frame is printed in a continuous printing method from the starting point to the ending point without pausing. The starting point and the ending point are at the same position. S2.2: Print multiple second-direction grid walls on the outer frame; S2.2.1: Print the first second-direction grid wall, including printing the first half of the second-direction grid wall and printing the second half of the second-direction grid wall; The printing of the first half of the second-direction grid wall includes: the printing starting point is at the center of the second-direction grid wall, the printing direction is towards the outer frame, and the printing continues until the formed second-direction grid wall intersects with the outer frame; The printing of the second-direction grid wall in the latter half includes: the printing starting point is the same as the printing starting point of the first half of the second-direction grid wall, the printing direction is opposite to the printing direction of the first half of the second-direction grid wall, and the printing continues until the formed second-direction grid wall intersects with the outer frame; When the formed second-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed second-direction grid wall and the outer frame; The first half of the second-direction grid wall and the second half of the second-direction grid wall form the first second-direction grid wall; S2.2.2: Print other second-direction grid walls, using the same printing method as S2.2.1, to form other second-direction grid walls; S2.3: Print multiple first-direction grid walls on the outer frame; S2.3.1: Print the first first-direction grid wall, including printing the first half of the first-direction grid wall and printing the second half of the first-direction grid wall; The printing of the first half of the first direction grid wall includes: the printing start point and the printing start point of the second half of the first direction grid wall are not at the same vertical projection position, the printing direction is towards the outer frame, and the printing is completed until the formed first direction grid wall intersects with the outer frame; The printing of the second half of the first direction grid wall includes: the printing starting point is the same as that of the first half of the first direction grid wall, the printing direction is opposite to that of the first half of the first direction grid wall, and the printing continues until the formed first direction grid wall intersects with the outer frame; When the formed first-direction grid wall and the second-direction grid wall are close to intersecting, the second parameter control method is used to connect the formed first-direction grid wall and the second-direction grid wall. When the formed first-direction grid wall and the outer frame are close to intersecting, the first parameter control method is used to connect the formed first-direction grid wall and the outer frame; The first half of the first-direction grid wall and the second half of the first-direction grid wall form the first first-direction grid wall; S2.3.2: Print other first-direction grid walls, using the same printing method as S2.3.1, to form other first-direction grid walls; S3: Odd-numbered layers are printed using method S1, and even-numbered layers are printed using method S2.

2. The thermal control and path planning method for the cross node of a fused wire additive manufacturing grid rudder according to claim 1, characterized in that, The first parameter control method includes: When the distance between the welding torch position and the center point of the outer frame is w, the wire feeding is paused, and the welding current of the welding torch is gradually reduced to the first current threshold. The arc is extinguished when the grid wall reaches the intersection with the outer frame. w represents the thickness of the outer frame.

3. The thermal control and path planning method for the cross node of a fused wire additive manufacturing grid rudder according to claim 2, characterized in that, The first current threshold is 50% of the original current value.

4. The thermal control and path planning method for the cross node of a fused wire additive manufacturing grid rudder according to claim 3, characterized in that, The arc extinguishing is a gradual process.

5. The thermal control and path planning method for the cross node of a fused wire additive manufacturing grid rudder according to claim 1, characterized in that, The second parameter control method includes: when the distance between the welding torch position and the center point of the formed grid wall is t, the wire feeding is paused, and the welding current of the welding torch is gradually reduced to the second current threshold. Then the welding current is maintained at the second current threshold, the welding torch moving speed remains unchanged, and when the position of the welding torch moves to the edge of the formed grid wall, the current is increased and the wire feeding begins to ensure the bonding performance at the intersection. t represents the wall thickness of the formed grid wall.

6. The thermal control and path planning method for the cross node of a fused wire additive manufacturing grid rudder according to claim 5, characterized in that, The second current threshold is 50% of the original current value.

7. The thermal control and path planning method for the cross node of a fused wire additive manufacturing grid rudder according to claim 1, characterized in that, The second parameter control method includes: when the distance between the welding torch position and the center point of the formed grid wall is t, the welding torch moving speed is accelerated to a speed threshold, and when the welding torch position moves to the edge of the formed grid wall, the original speed is restored; t represents the wall thickness of the formed grid wall.

8. The thermal control and path planning method for the cross node of a fused wire additive manufacturing grid rudder according to claim 7, characterized in that, The speed threshold is 2-3 times the original moving speed of the welding torch.

9. The thermal control and path planning method for the cross node of a fused wire additive manufacturing grid rudder according to claim 1, characterized in that, The starting points of the print outlines for odd-numbered layers and even-numbered layers are located on different axes.

10. A method for thermal control and path planning of fused wire additive manufacturing grid rudder cross nodes according to any one of claims 2-8, characterized in that, The welding torch is equipped with an argon gas injection device and an infrared camera.

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