A path planning method for arc fuse additive manufacturing

Abstract

The present application relates to the field of arc fuse additive manufacturing technology, specifically to a method for arc fuse additive manufacturing path planning, the method comprising: S1, setting n points along a set deposition loop at the arc starting point, marking them in sequence, and making the welding gun move between A1 and A2. n The deposition between the points forms the first row of horizontal continuous deposition cycle paths; S2, according to the transition starting point A of S1 n , the path is connected to the second row of horizontal continuous deposition cycle path, and n points are set along the set deposition path loop and marked in sequence so that the welding gun is between B1 and B n Deposition between the points forms a second row of transverse continuous deposition loops; S3, repeating S2 until the specified number of grid intersection structures is reached, and the transition points of the last row of transverse loops are connected to the arc starting point. This application solves the problem in the prior art of uneven heat distribution before and after the intersection, which ultimately causes the welding gun to crash due to excessively high node peaks.

Description

Technical Field

[0001] The present application relates to the technical field of arc fuse additive manufacturing, and in particular to a method for arc fuse additive manufacturing path planning. Background Art

[0002] Wire Arc Additive Manufacturing (WAAM) is an advanced digital manufacturing technology that uses an electric arc as a heat source to melt metal wire. Then, under program or software control, the wire is clad layer by layer according to a three-dimensional digital model, ultimately producing a three-dimensional metal blank that closely matches the desired shape and dimensions. In recent years, WAAM has been widely adopted in various fields, including aerospace, defense, shipbuilding, railways, automotive, and energy. In particular, WAAM is used in the aerospace sector to manufacture key components such as rocket fuel tanks.

[0003] The strict weight requirements of aerospace products have prompted designers to employ various rib structures to ensure product strength. Grid rib structures are particularly common among these. The basic unit of a rectangular grid rib structure consists of four mutually perpendicular lines, forming a regular rectangular grid. This structure provides strength while also offering good rigidity and stability, meeting the stringent requirements of aerospace products.

[0004] In the existing technology, when using arc fuse additive manufacturing technology to construct a grid reinforcement structure, the deposition strategy is a direct "cross" cross, which is to first deposit the first deposition layer horizontally along the perpendicular substrate, and then deposit the second deposition layer vertically along the first deposition layer. When the welding gun approaches the first deposition layer, the arc is attracted by the raised part, resulting in uneven heat distribution before and after the intersection. Once this uneven heat distribution is formed, it will be continuously amplified in the subsequent forming process, and eventually cause the risk of collision of the welding gun due to excessively high node peak. Summary of the Invention

[0005] The purpose of this application is to provide an arc fuse additive manufacturing path planning method, which solves the problem in the prior art that due to the uneven distribution of heat before and after the intersection, the welding gun eventually collides due to excessively high node peaks.

[0006] The technical solution of this application:

[0007] The present application provides a path planning method for arc fuse additive manufacturing, comprising:

[0008] S1. Set n points along the set deposition loop at the arc starting point and mark them in order as A1, A2, .., A n , n is a positive integer, the arc fuse additive manufacturing process is used to make the welding gun in A1~A nThe deposition between the points forms the first row of transverse continuous deposition circulation paths, which takes A1 as the starting point and A (n+1) / 2 is the turning point of the return path, A n It is the transition starting point for the next row of horizontal circulation paths;

[0009] S2, based on the transition starting point A of S1 n , the path is connected to the second row of horizontal continuous deposition cycle paths, and n points are set along the set deposition path loop, marked in sequence as B1, B2, ···, B n , n is a positive integer, the arc fuse additive manufacturing process is used to make the welding gun between B1 and B n The deposition between the points forms a second row of transverse continuous deposition circulation paths, which starts from B1 and ends at B (n+1) / 2 B is the turning point of the return path. n It is the transition starting point for the next row of horizontal circulation paths;

[0010] S3. Repeat S2 until the specified number of grid intersection structures is reached, the transition point of the last row of horizontal circulation loops is connected to the arc starting point, the path passes through the lower inflection point of the last row of horizontal circulation loops, passes through all return path inflection points, and passes through the upper inflection point of the first row of horizontal circulation loops. The distance between the deposition circulation path and the inflection point is h.

[0011] In some embodiments, the deposition strategy of the arc fuse additive manufacturing for the cross structure is a symmetrical path of V shape and Λ shape; the inflection point is an intersection inflection point, which is a line segment, and the distance between the two adjacent intersection inflection points is h.

[0012] In some embodiments, in S1, the first row of transverse continuous deposition cycle paths is closed at the arc starting point, where the deposition direction of the deposition strategy is from left to right along its transverse extension direction, and turns back at the turning point of the return path, where the deposition direction of the deposition strategy is from right to left along its transverse extension direction.

[0013] In some embodiments, the deposition cycle path in S1 is at the return path inflection point A. (n+1) / 2 Draw horizontal lines at the two endpoints of the line segment. All diagonal inflection points on the line drawn by the endpoints are odd-numbered inflection points, and the outer inflection points on the upper and lower sides are even-numbered inflection points. The inflection points on the same side are all on the same horizontal line. The distance between odd-numbered diagonal inflection points is h, and the distance between even-numbered diagonal inflection points is H.

[0014] In some embodiments, the deposition cycle path in S2 is returned to the inflection point B. (n+1) / 2 The two endpoints of the line segment are horizontal straight lines. All diagonal inflection points on the straight line drawn by the endpoints are odd-numbered inflection points, and the outer inflection points on the upper and lower sides are even-numbered inflection points. The inflection points on the same side are all on the same horizontal straight line.(n+1) / 2 The turning point of the return path is the same as the horizontal A in the previous row (n+1) / 2 The inflection points of the return path are on the same vertical line. The distance between the odd-numbered diagonal inflection points is h, and the distance between the even-numbered diagonal inflection points is H.

[0015] In some embodiments, in S1 , all even-numbered inflection points of the deposition strategy are vertically symmetrical along a horizontal straight line at the midpoint of the line segment where the inflection point of the return path is located.

[0016] In some embodiments, in S1 and S2, the second row of transverse continuous deposition cycle deposition paths is obtained by longitudinally translating the first row of transverse continuous deposition cycle paths, and the translation distance is the sum of the distance h between the upper and lower rows of odd inflection points and the distance H between the upper and lower rows of even inflection points.

[0017] In some embodiments, in the path planning method, the arc starting point and the arc extinguishing point of the welding gun are the same point.

[0018] In some embodiments, it also includes S4, using the deposition strategy to perform multi-layer deposition, specifically, taking the arc starting point as the starting point of the loop instruction, making an offset in the direction perpendicular to the substrate, and the offset amount is the layer height of the first layer of the multi-grid cross structure, and looping steps S1 to S3 in sequence, the arc starting point and the arc extinguishing point of the multi-layer deposition operation are the same point on the projection of the substrate plane.

[0019] The technical solution of the present application has at least the following advantages and beneficial effects: The present application provides an arc fuse additive manufacturing path planning method, in which the intersection structures in the network intersection structure do not have a mutual crossing relationship or a direct overlapping relationship, and the distance between the diagonals is h. Non-contact deposition replaces overlapping deposition, and there will be no repeated deposition of material at the nodes, which effectively solves the problem of bulges caused by excessive deposition of material at the intersection and reduces the risk of welding gun collision caused by excessive deposition of material at the nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A flow chart of the path planning method provided in this application;

[0021] Figure 2 A schematic diagram of a node of a deposition strategy in the prior art;

[0022] Figure 3 A schematic diagram of a node of a deposition strategy in an embodiment;

[0023] Figure 4 Schematic diagram of the inflection point model of the deposition strategy in the embodiment;

[0024] Figure 5 This is a schematic diagram of the first row of lateral continuous deposition circulation paths in the embodiment;

[0025] Figure 6 Schematic diagram of two rows of lateral continuous deposition cycle paths and their transitions in the embodiment;

[0026] Figure 7 A schematic diagram of a complete loop path in an embodiment;

[0027] Figure 8 is the parabolic deposition model of the odd diagonal inflection point distance h in the embodiment;

[0028] Figure 9 is the arc deposition model with odd diagonal inflection point distance h in the embodiment.

[0029] In the figure: 81 - first parabola deposited microbeads, 82 - second parabola deposited microbeads; 91 - first arc deposited microbeads; 92 - second arc deposited microbeads. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] Application Overview

[0032] In the prior art, during the process of arc fuse additive manufacturing, a "cross"-shaped deposition strategy is directly adopted. The first deposition layer is first deposited horizontally along the perpendicular substrate, and then the second deposition layer is deposited perpendicularly to the first deposition layer. When the welding gun approaches the first deposition layer, the arc is attracted by the protruding part, resulting in uneven heat distribution before and after the intersection. Specifically, the area before and after the intersection becomes narrower and lower due to insufficient heat input, while the protruding part becomes wider and higher due to excessive heat input. Figure 2 As shown, Figure 2 The intersections have noticeable bulges. Once this uneven heat distribution forms, it will be amplified during the subsequent forming process. Ultimately, excessive material deposition at the intersection nodes, gaps in the nodes leading to insufficient bonding strength, and the risk of welding gun collisions due to excessively high node peaks. Furthermore, the direct cross-deposition strategy introduces excessive arc starting and extinction points, making the arc unstable at these points, resulting in incomplete material melting and poor mechanical properties at the arc starting and ending points. These defects not only affect the machining accuracy and efficiency of the mesh reinforcement after forming, but also directly affect the performance and reliability of the product.

[0033] Based on the above, the present application provides a method for arc fuse additive manufacturing path planning, which completes the continuous manufacturing of multi-grid cross structures through one arc starting. This forming method has no crossing relationship in the path at the intersection node, and there will be no risk of excessive material deposition at the intersection node, insufficient bonding force due to gaps at the node, or collision of the welding gun due to excessively high node peaks. It can form a multi-grid cross structure with flat node peaks and no structural defects, meeting the requirements of subsequent mechanical processing and use. This method completes manufacturing through one arc starting, suppresses the number of arc starting and ending points, and does not have an idle path formed by the movement of the welding gun between multiple arc starting points. The deposition efficiency is high and the forming process is simple and easy to implement. Moreover, the intersection inflection point distance of the multi-grid cross structure in this method can be calculated and solved accordingly according to different process parameters, and is applicable to the manufacturing of metal multi-grid cross structures including but not limited to aluminum alloys, titanium alloys, stainless steel, and high-temperature alloys.

[0034] Example

[0035] For details, please refer to Figures 1-9 Taking a specific implementation as an example, the arc fuse additive manufacturing path planning method provided by this application is described, which specifically includes:

[0036] S1. Set n points along the set deposition loop at the arc starting point and mark them in order as A1, A2, .., A n , n is a positive integer, the arc fuse additive manufacturing process is used to make the welding gun in A1~A n The deposition between the points forms the first row of transverse continuous deposition circulation paths, which takes A1 as the starting point and A (n+1) / 2 is the turning point of the return path, A n It is the transition starting point for the next row of horizontal circulation paths;

[0037] S2, based on the transition starting point A of S1 n , the path is connected to the second row of horizontal continuous deposition cycle paths, and n points are set along the set deposition path loop, marked in sequence as B1, B2, ···, B n , n is a positive integer, the arc fuse additive manufacturing process is used to make the welding gun between B1 and B n The deposition between the points forms a second row of transverse continuous deposition circulation paths, which starts from B1 and ends at B (n+1) / 2 B is the turning point of the return path. n It is the transition starting point for the next row of horizontal circulation paths;

[0038] S3. Repeat S2 until the specified number of grid intersection structures is reached, the transition point of the last row of horizontal circulation loops is connected to the arc starting point, the path passes through the lower inflection point of the last row of horizontal circulation loops, passes through all return path inflection points, and passes through the upper inflection point of the first row of horizontal circulation loops. The distance between the deposition circulation path and the inflection point is h.

[0039] It is worth noting that in this embodiment, the deposition strategy for the arc fuse additive manufacturing for the cross structure is a symmetrical path of V and Λ shapes; the inflection point is a cross inflection point, which is a line segment, and the distance between two adjacent cross inflection points is h. Compared with the prior art that directly adopts a "cross" cross deposition strategy for the cross structure, this embodiment adopts a "V" shape and "Λ" shape symmetrical strategy to deposit the cross node, such as Figure 3 As shown, Figure 3 There are no obvious protrusions at the nodes, that is, there is no mutual crossing and overlapping relationship at the nodes of the multi-grid structure, and there will be no repeated deposition of materials at the nodes, which reduces the risk of welding gun collision caused by excessive material deposition at the nodes; preferably, the distance h at the intersection node can be quantitatively calculated through algebraic relations. On the other hand, the inflection points in the prior art are all sharp points, while all the inflection points in this embodiment are cross inflection points, which are no longer sharp points, but are formed by A n-1 and A n-2 The distance between the inflection points is h, such as Figure 4 As shown, Figure 4 The inflection point is composed of a small line segment. For example, the inflection point A1 is composed of line segment A. 1-1 and A 1-2 The composition replaces the sharp "point" to "point" in the prior art with smooth "line segment" to "line segment", which increases the contact area. This makes the nodes of this embodiment have better bonding force during the deposition process and provides sufficient processing allowance for subsequent fine processing.

[0040] In some embodiments, in S1, the first row of transverse continuous deposition cycle paths is closed at the arc starting point, where the deposition direction of the deposition strategy is from left to right along its transverse extension direction, and turns back at the turning point of the return path, where the deposition direction of the deposition strategy is from right to left along its transverse extension direction.

[0041] In some embodiments, the deposition cycle path in S1 is at the return path inflection point A. (n+1) / 2 The two endpoints of the line segment are horizontal lines. All diagonal inflection points on the line drawn by the endpoints are odd-numbered inflection points, and the outer inflection points on the upper and lower sides are even-numbered inflection points. The inflection points on the same side are all on the same horizontal line. The distance between the odd-numbered diagonal inflection points is h, and the distance between the even-numbered diagonal inflection points is H. For example Figure 5As shown, A1 is the starting point of the first row of horizontal continuous deposition cycle path, A7 is the turning point of the return path, and A 13 It is the transition starting point of the next row of lateral circulation paths; among them, A2A4A6 is the even-numbered turning point on the upper side of the first row of lateral continuous deposition circulation paths, A3A5A9A 11 For the diagonal odd inflection point, A8A 10 A 12 It is an even-numbered inflection point on the lower periphery.

[0042] In some embodiments, in S1, all even-numbered inflection points of the deposition strategy are vertically symmetrical along a horizontal straight line at the midpoint of the line segment where the return path inflection point is located. Specifically, the angles of the inflection points can be varied to accommodate different types of multi-grid structures.

[0043] It should be noted that in S2, according to the transition starting point A of S1 n , the path connects to the second row of horizontal continuous deposition cycle paths. During the above process, there is no need to re-start the arc. The deposition path in this application is continuous and uninterrupted. A single arc start can complete the manufacture of a multi-grid cross structure, without any idle steps, and the deposition efficiency is high.

[0044] In some embodiments, the deposition cycle path in S2 is returned to the inflection point B. (n+1) / 2 The two endpoints of the line segment are horizontal straight lines. All diagonal inflection points on the straight line drawn by the endpoints are odd-numbered inflection points, and the outer inflection points on the upper and lower sides are even-numbered inflection points. The inflection points on the same side are all on the same horizontal straight line. (n+1) / 2 The turning point of the return path is the same as the horizontal A in the previous row (n+1) / 2 The inflection points of the return path are on the same vertical line, the distance between the odd-numbered inflection points is h, and the distance between the even-numbered inflection points is H. For example Figure 6 As shown, Figure 6 The arc starting point and arc extinction point are the same point, and the path starts from the transition starting point A of the first row of horizontal circulation paths. 13 Connect to B1, A 13 The distance between B1 and B7 is H. B1 is the starting point of the second row of horizontal continuous deposition cycle path. B7 is the turning point of the return path. 13 It is the transition starting point of the next row of horizontal circulation paths; among them, B2B4B6 is the even-numbered turning point on the upper side of the second row of horizontal continuous deposition circulation paths, B3B5B9B 11 For the diagonal odd inflection point, B8B 10 B 12 It is an even-numbered inflection point on the lower periphery.

[0045] In some embodiments, in S1 and S2, the second row of transverse continuous deposition cycle deposition paths is obtained by longitudinally translating the first row of transverse continuous deposition cycle paths, and the translation distance is the sum of the distance h between the upper and lower rows of odd inflection points and the distance H between the upper and lower rows of even inflection points.

[0046] In some embodiments, in the path planning method, the arc starting point and arc extinction point of the welding gun are the same point. Specifically, in the path planning method, all grid structures in S1 and S2 are included, and finally return to the arc starting point to form a complete grid reinforcement rib structure. It is worth noting that the transition between the cyclic paths in this embodiment does not require repeated arcing, but only requires one arcing. The welding gun can pass through all edges of the grid intersection structure along the proposed deposition path and finally return to the arc starting point, that is, the arc starting point and arc extinction point of the welding gun are the same point. Because the deposition strategy adopted in this embodiment only requires one arcing to complete the manufacture of multiple grid intersection structures, there are no redundant arc starting points and arc extinction points. Therefore, the welding gun can complete the deposition of the multiple grid intersection structure after one arcing and arc extinction; compared with the traditional deposition strategy, the welding gun in this embodiment does not need to move between multiple arc starting and ending points, eliminating the idle travel, effectively improving the deposition efficiency, and effectively solving the problem of the traditional deposition strategy with multiple arc starting and arc extinction points leading to a decrease in the overall mechanical properties of the workpiece.

[0047] Specifically, in S3, S2 is repeated until the specified number of grid intersection structures is reached, the transition point of the last row of horizontal circulation loops is connected to the arc starting point, the path passes through the lower inflection point of the last row of horizontal circulation loops, and the path does not coincide with the straight line where the lower inflection point is located; after passing through all return path inflection points, the path does not coincide with the vertical line where the return path inflection point is located; after passing through the upper inflection point of the first row of horizontal circulation loops, the path does not coincide with the straight line where the upper inflection point is located; the distance between the deposition circulation path and the inflection point is h. For example Figure 7 As shown, the path starts from the transition starting point B of the last row of horizontal circulation paths. 13 Connect to A1, where A1 is the arc starting point and the distance from the straight line where the outer horizontal inflection point is located and the vertical line where the outer longitudinal inflection point is located is h, and the corners passed by the path are all 90° right angles.

[0048] In some embodiments, it also includes S4, using the deposition strategy to perform multi-layer deposition, specifically, taking the arc starting point as the starting point of the loop instruction, making an offset in the direction perpendicular to the substrate, and the offset amount is the layer height of the first layer of the multi-grid cross structure, and looping steps S1 to S3 in sequence, the arc starting point and the arc extinguishing point of the multi-layer deposition operation are the same point on the projection of the substrate plane.

[0049] It should be noted that the arc fuse additive manufacturing path planning method provided in this embodiment is applicable to materials including but not limited to aluminum alloy, titanium alloy, stainless steel, high-temperature alloy and other metal multi-grid cross structures.

[0050] Further, please refer to Figure 2-Figure 8 Taking a specific implementation as an example, the S2 step of the arc fuse additive manufacturing path planning method provided in this application is described in detail to illustrate the specific function and calculation of h mentioned in the method, that is, the actual change of the distance h between the odd-numbered diagonal inflection points is indicated by an algebraic method, and the distance h between the odd-numbered diagonal inflection points and the corresponding deposition layer width are adjusted to achieve the effect of suppressing the cross-node peak.

[0051] It should be noted that in S2, the distance h between the odd inflection points of the upper and lower diagonals, that is, the distance h of the odd diagonal inflection points, is used to describe the distance between adjacent depositions. There is deposition overlap in the distance between the adjacent depositions. Excessive deposition overlap will cause the peak of the corresponding odd diagonal inflection point node to be too high. The width and height of the corresponding deposition are obtained, and the information is calculated to obtain the distance h between the odd diagonal inflection points, and the distance H between the even diagonal inflection points is further changed to achieve a deposition effect with no peak at the cross node.

[0052] For the odd-numbered diagonal inflection point distance h described in step S2, the mathematical relationship is as follows:

[0053] In the parabolic deposition model, there are a first parabolic deposition bead 81 and a second parabolic deposition bead 82, as shown in FIG. Figure 8 There are first arc deposition beads 91 and second arc deposition beads 92 in the arc deposition model, as shown Figure 9 As shown, without changing the deposition parameters of the first parabola deposition microbead 81, the second parabola deposition microbead 82, the first arc deposition microbead 91, and the second arc deposition microbead 92, assuming that the microbead profiles are symmetrical, that is, the function expression of the first parabola deposition microbead 81 is the same as the function expression of the second parabola deposition microbead 82, and the function expression of the first arc deposition microbead 91 is the same as the function expression of the second arc deposition microbead 92, then the first parabola deposition microbead 81 and the second parabola deposition microbead 82 are y=a+cx 2 The first arc deposited beads 91 and the second arc deposited beads 92 are In the first parabola deposition microbead 81 and the second parabola deposition microbead 82, the algebraic form represented by a and c can be represented by the microbead height k and the microbead width w, that is, a=k, In the first arc deposited micro beads 91 and the second arc deposited micro beads 92, the algebraic form represented by a and b can be represented by the micro bead height k and the micro bead width w, that is, ab = k, Therefore, the geometric forms of the first parabolic deposition beads 81 and the second parabolic deposition beads 82 are: The geometric forms of the first arc deposition beads 91 and the second arc deposition beads 92 are:

[0054] This embodiment adopts the flat top model to model the micro beads. Figure 8 and Figure 9 As shown, when S MGN =S EGF When the surface of adjacent overlapping beads is flat, different microbead widths can be obtained under different process parameters. Therefore, it is necessary to determine the distance between the microbead width w and the microbead spacing MN (i.e. h), namely:

[0055]

[0056] For the wire feeding speed and welding gun movement speed under different process parameters, it can be obtained that there are first parabolic deposition beads 81 and second parabolic deposition beads 82 in different parabolic deposition models, and there are first arc deposition beads 91 and second arc deposition beads 92 in the arc deposition model. The width of the obtained distance between the odd diagonal inflection points is h.

[0057] The mathematical relationship for the distance H between the even-numbered inflection points of the upper and lower diagonals described in step S2, that is, the distance H between the even-numbered diagonal inflection points, is as follows:

[0058] The value of H is twice the longitudinal distance between adjacent turning points in the same row, excluding the turning point of the return path, plus h; Figure 5 As shown, H = longitudinal distance of A5A6 × 2 + h.

[0059] It should be noted that there are first parabolic deposited microbeads 81 and second parabolic deposited microbeads 82 in the parabolic deposition model, and there are first arc deposited microbeads 91 and second arc deposited microbeads 92 in the arc deposition model. Different microbead widths exist depending on the process parameters. The distance h between them and the distance H between the even diagonal inflection points can be used to calculate the same effect as the method provided in this embodiment.

[0060] The arc fuse additive manufacturing path planning method provided in this embodiment is used to deposit Figure 7 The multi-grid cross structure shown in the figure is implemented as follows:

[0061] First, a 6061 aluminum alloy substrate with a size of 400mm*400mm*10mm was selected as the substrate, and the molten electrode was ER4043 aluminum alloy welding wire, and the CMT-Pulse process was used for printing.

[0062] Then, the deposition parameters are determined and the width of the deposition layer is measured to calculate the diagonal inflection point distance h;

[0063] Then, the welding gun starts from the arc starting point, passes through all edges in sequence along the proposed deposition path, and finally returns to the arc starting point;

[0064] Finally, to perform multi-layer deposition, it is only necessary to offset the layer height of the first layer along the vertical direction of the substrate along the arc starting point. The welding gun movement path is the same as S3, and so on, until the overall multi-grid cross structure is completed.

[0065] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0066] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A method for arc fuse additive manufacturing path planning, characterized in that: include: S1. Set n points along the set deposition loop at the arc starting point and mark them in order as A1, A2, .., A n , n is a positive integer, the arc fuse additive manufacturing process is used to make the welding gun in A1~A n The deposition between the points forms the first row of transverse continuous deposition circulation paths, which takes A1 as the starting point and A (n+1) / 2 is the turning point of the return path, A n It is the transition starting point for the next row of horizontal circulation paths; S2, based on the transition starting point A of S1 n , the path is connected to the second row of horizontal continuous deposition cycle paths, and n points are set along the set deposition path loop, marked in sequence as B1, B2, ···, B n , n is a positive integer, the arc fuse additive manufacturing process is used to make the welding gun between B1~B n The deposition between the points forms a second row of transverse continuous deposition circulation paths, which starts from B1 and ends at B (n+1) / 2 B is the turning point of the return path. n It is the transition starting point for the next row of horizontal circulation paths; S3, repeat S2 until the specified number of grid intersection structures is reached, the transition point of the last row of lateral circulation loops is connected to the arc starting point, the path passes through the lower inflection point of the last row of lateral circulation loops, passes through all return path inflection points, passes through the upper inflection point of the first row of lateral circulation loops, and the distance between the deposition circulation path and the inflection point is h; The deposition strategy of the arc fuse additive manufacturing for the cross structure is a symmetrical path of V-shape and Λ-shape; The inflection point is a cross inflection point, which is a line segment, and the distance between two adjacent cross inflection points is h.

2. The path planning method according to claim 1, characterized in that: In S1, the first row of transverse continuous deposition cycle paths is closed at the arc starting point, where the deposition direction of the deposition strategy is from left to right along its transverse extension direction, and turns back at the turning point of the return path, where the deposition direction of the deposition strategy is from right to left along its transverse extension direction.

3. The path planning method according to claim 2, characterized in that: The deposition cycle path in S1 is inflected at the return path A. (n+1) / 2 Draw horizontal lines at the two endpoints of the line segment. All diagonal inflection points on the line drawn by the endpoints are odd-numbered inflection points, and the outer inflection points on the upper and lower sides are even-numbered inflection points. The inflection points on the same side are all on the same horizontal line. The distance between odd-numbered diagonal inflection points is h, and the distance between even-numbered diagonal inflection points is H.

4. The path planning method according to claim 3, characterized in that: Deposition cycle path in S2 to return path inflection point B (n+1) / 2 The two endpoints of the line segment are horizontal straight lines. All diagonal inflection points on the straight line drawn by the endpoints are odd-numbered inflection points, and the outer inflection points on the upper and lower sides are even-numbered inflection points. The inflection points on the same side are all on the same horizontal straight line. (n+1) / 2 The turning point of the return path is the same as the horizontal A in the previous row (n+1) / 2 The inflection points of the return path are on the same vertical line. The distance between the odd-numbered diagonal inflection points is h, and the distance between the even-numbered diagonal inflection points is H.

5. The path planning method according to claim 4, characterized in that: In S1 , all even-numbered inflection points of the deposition strategy are vertically symmetrical along a horizontal straight line at the midpoint of the line segment where the inflection point of the return path is located.

6. The path planning method according to claim 5, characterized in that: In S1 and S2, the second row of transverse continuous deposition cycle deposition paths is obtained by longitudinally translating the first row of transverse continuous deposition cycle paths, and the translation distance is the sum of the distance h between the upper and lower rows of odd-numbered inflection points and the distance H between the upper and lower rows of even-numbered inflection points.

7. The path planning method according to claim 6, characterized in that: In the path planning method, the arc starting point and arc extinguishing point of the welding gun are the same point.

8. The path planning method according to claim 7, characterized in that: It also includes S4, using the deposition strategy to perform multi-layer deposition. Specifically, the arc starting point is used as the starting point of the loop instruction, and an offset is made in the direction perpendicular to the substrate. The offset amount is the layer height of the first layer of the multi-grid cross structure. Steps S1 to S3 are looped in sequence. The arc starting point and the arc extinguishing point of the multi-layer deposition operation are the same point on the projection of the substrate plane.

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