Additive and subtractive composite manufacturing process planning method oriented to element runner structural characteristics

Abstract

The invention discloses an additive and subtractive composite manufacturing process planning method for element runner structure features, which comprises the following steps: S1, analyzing the feature structure of a runner, optimizing the runner for additive and subtractive composite manufacturing, and splitting a multi-runner structure into a plurality of single-runner structures; s2, a machining strategy is set, namely, the single runners are machined one by one in sequence, and a single-runner additive machining strategy is machining along a centroid shaft; s3, developing a collision detection algorithm for flow channel additive and subtractive machining, and circularly solving a machining area segmentation plane by using the collision detection algorithm along a flow channel centroid shaft to obtain a flow channel additive and subtractive alternate area division scheme; s4, generating specific additional material and subtractive material processing procedures; and S5, post-processing to generate a processing code, and importing the processing code into additive and subtractive composite manufacturing equipment for processing. According to the invention, the process planning result without collision and with high processing efficiency can be quickly and efficiently obtained.

Description

Technical Field

[0001] This invention belongs to the field of additive and subtractive composite manufacturing technology, and particularly relates to a method for planning additive and subtractive composite manufacturing processes based on the structural characteristics of basic flow channels. Background Technology

[0002] The flow channel structure refers to the piping used to transport fluid media in a hydraulic system and is an important component of hydraulic components. Traditionally, the flow channel structure in components such as hydraulic manifolds is obtained through machining by drilling. This results in machining holes at bends and intersections in the flow channel, and also leaves a large amount of redundant material. This traditional machining method leads to significant mass and pressure losses in the flow channel structure, impacting the efficiency of the hydraulic system. Therefore, the design and manufacturing of current hydraulic system flow channel structures urgently need improvement to meet the needs of high-end equipment fields such as aerospace, robotics, and engineering machinery.

[0003] Additive-subtractive manufacturing (ABM) is an emerging processing technology that combines the high degree of freedom in additive manufacturing with the high processing quality of subtractive manufacturing. It can be used to process complex-shaped, high-precision parts. Using ABM to process flow channel structures can avoid a large amount of excess material, significantly reducing the weight of the hydraulic system. Simultaneously, ABM can avoid the presence of process holes in flow channels, helping to reduce pressure loss. However, as a complex structure with internal cavities, flow channel structures require strict adherence to process constraints when processed using ABM. These constraints primarily include the absence of supports on the flow channel inner walls and the avoidance of collisions and interference during processing. Current ABM process planning methods heavily rely on manual methods for dividing processing areas, making it difficult to efficiently achieve collision-free and high-efficiency process planning results. Summary of the Invention

[0004] To address the technical problems of existing additive and subtractive manufacturing process planning methods, this invention proposes a method for planning additive and subtractive composite manufacturing processes based on the structural characteristics of basic flow channels, comprising: S1. Analyze the characteristic structure of the flow channel, optimize the flow channel for additive and subtractive composite manufacturing, and decompose the multi-flow channel structure into multiple single-flow channel structures. S2. Set the processing strategy to process each single flow channel sequentially, and the single flow channel additive processing strategy to process along the mandrel. S3. Using a collision detection algorithm, the processing area segmentation plane is solved iteratively along the centroidal axis of the flow channel to obtain a flow channel alternating region division scheme. S4. Generate specific additive and subtractive manufacturing processes; S5. Post-processing generates machining code, which is then imported into additive and subtractive composite manufacturing equipment for processing.

[0005] Optionally, the process of analyzing the flow channel feature structure includes: optimizing the flow channel geometry for additive and subtractive composite manufacturing, changing the curved flow channel from a right-angle bend to a circular arc transition form; and splitting the multi-flow channel structure into multiple single-flow channel structures, including the main flow channel and the secondary flow channel.

[0006] Optionally, the process of setting the processing strategy includes: processing each single flow channel sequentially, with the additive processing direction along the centroidal axis, satisfying the requirement that the inner wall of the flow channel is unsupported; each layer in the additive process of the flow channel is divided by a plane perpendicular to the centroidal axis, and any point on the flow channel can correspond to a tangent vector on the centroidal axis. t .

[0007] Optionally, the process of using a collision detection algorithm includes: developing a collision detection algorithm using a programming language; importing the nozzle / tool ​​model and the finished part model at any machining point location into the same coordinate system; and obtaining the coordinates of any machining point from the part model. x,y,z The strategy of machining along the centroidal axis ensures that any machining point of the flow channel part can uniquely correspond to the tangent vector of its centroidal axis. t For additive manufacturing, the nozzle axis vector a Tangent vector to the centroidal axis corresponding to the current machining point t The same; therefore, import the coordinates of the processing point ( x,y,z ) and the corresponding centroidal axis vector t This allows us to obtain the model of the nozzle at any machining position; for subtractive machining, the tool axis vector... a It needs to be the tangent vector of the centroidal axis t Tilt angle of rotary cutting tool θ Obtain. Set the normal vector of the plane where the rotation operation occurs. n To ensure the obtained tool axis vector a To ensure uniqueness, the tool's axis vector is obtained using the Rodriguez rotation formula. a Therefore, the coordinates of the imported processing points ( x, y,z ) and the corresponding centroidal axis vector t And set the tool tilt angle θ and the normal vector of the plane of rotation n The model of the tool at any machining position can be obtained; by judging whether the nozzle / tool ​​model in the same coordinate system intersects with the part model, it can be determined whether a collision occurs at any machining position in the flow channel additive and subtractive machining; a dividing plane perpendicular to the centroid axis is set in advance at the collision position; all dividing planes are solved iteratively to obtain the region division scheme with the fewest segments; Among them, solving for the axis vector of the tool. a The Rodriguez rotation formula is as follows: .

[0008] Optionally, the process of generating specific additive and subtractive manufacturing processes includes: using process planning software to plan processes according to the area division scheme; offsetting each segmented flow channel by a certain distance on the inner and outer walls and end faces as a machining allowance; and removing this allowance in the subsequent subtractive manufacturing process.

[0009] Optionally, the subtractive processing steps include: face milling to remove end face offset allowance; inner wall milling to remove inner wall offset allowance; outer wall milling to remove outer wall offset allowance; and for intersecting flow channel areas, hole milling is used to obtain complete flow channels.

[0010] Optionally, the post-processing steps include: matching a suitable five-axis additive and subtractive manufacturing equipment; generating actual machining code; and operating the machine tool to execute the code to complete the machining.

[0011] Optionally, the method further includes adding an auxiliary flow channel; the auxiliary flow channel is formed by offsetting downward by a certain distance to avoid collision between the nozzle / tool ​​and the machine tool base during five-axis machining.

[0012] Technical advantages of this invention: This invention discloses a method for planning additive and subtractive manufacturing processes based on the structural characteristics of basic flow channels, applicable to various flow channels in hydraulic systems. By setting a machining strategy along the centroidal axis, the additive and subtractive manufacturing process constraint of unsupported inner walls of the flow channels is satisfied. The developed collision detection algorithm ensures that the nozzle / tool ​​does not collide with the formed parts during machining, satisfying the collision-free additive and subtractive manufacturing process constraint, and obtaining a machining area division scheme with the fewest segments. Therefore, this invention can obtain an efficient additive and subtractive manufacturing process planning scheme for flow channels with unsupported inner walls and collision-free machining. Furthermore, this invention considers additive and subtractive manufacturing processes for more complex flow channel structures, by dividing complex multi-flow channel structures into multiple single flow channels for separate machining. For example, for intersecting flow channels, a complete flow channel can be obtained through milling at the flow channel intersection, providing guidance for planning additive and subtractive manufacturing processes for more complex flow channel structures. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a flowchart illustrating a method for planning additive and subtractive composite manufacturing processes based on the structural features of basic flow channels, according to the present invention. Figure 2 This is a structural diagram of the straight flow channel in Embodiment 1 of the present invention; Figure 3 This is a diagram illustrating the specific processing strategy of Embodiment 1 of the present invention; Figure 4 This is an optimized diagram of the right-angle bend flow channel structure according to Embodiment 2 of the present invention; Figure 5 This is a diagram of the curved flow channel structure of Embodiment 2 of the present invention; Figure 6 This is a diagram illustrating the specific processing strategy of Embodiment 2 of the present invention; Figure 7 This is a diagram of the crossflow channel structure of Embodiment 3 of the present invention; Figure 8 This is a diagram illustrating the specific processing strategy of Embodiment 3 of the present invention; Among them, 1. First section of straight flow channel, 2. Second section of straight flow channel, 3. Third section of straight flow channel, 4. Processing substrate of straight flow channel, 5. Wire cutting position of processing straight flow channel, 6. First section of curved flow channel, 7. Second section of curved flow channel, 8. Third section of curved flow channel, 9. Auxiliary flow channel of curved flow channel, 10. Processing substrate of curved flow channel, 11. Wire cutting position of processing curved flow channel, 12. First section of cross flow channel, 13. Second section of cross flow channel, 14. Third section of cross flow channel, 15. Fourth section of cross flow channel, 16. Auxiliary flow channel of cross flow channel, 17. Processing substrate of cross flow channel, 18. Wire cutting position of processing cross flow channel. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0016] like Figure 1 As shown, a method for planning additive and subtractive composite manufacturing processes based on the structural characteristics of basic flow channels is provided, including: S1. Analyze the characteristic structure of the flow channel, optimize the flow channel for additive and subtractive composite manufacturing, and decompose the multi-flow channel structure into multiple single-flow channel structures. S2. Set the processing strategy to process each single flow channel sequentially, and the single flow channel additive processing strategy to process along the mandrel. S3. Using a collision detection algorithm, the processing area segmentation plane is solved iteratively along the centroidal axis of the flow channel to obtain a flow channel alternating region division scheme. S4. Generate specific additive and subtractive manufacturing processes; S5. Post-processing generates machining code, which is then imported into additive and subtractive composite manufacturing equipment for processing.

[0017] Furthermore, the process of analyzing the characteristic structure of the flow channel includes: optimizing the geometric features of the flow channel for additive and subtractive composite manufacturing, changing the curved flow channel from a right-angle bend to a circular arc transition form; and splitting the multi-flow channel structure into multiple single-flow channel structures, including the main flow channel and the secondary flow channel.

[0018] Furthermore, the process of setting the processing strategy includes: processing each individual flow channel sequentially, with the additive processing direction along the centroidal axis, ensuring that the inner wall of the flow channel is unsupported. Each layer in the additive process of the flow channel is divided by a plane perpendicular to the centroidal axis, and any point on the flow channel can correspond to a tangent vector on the centroidal axis. t .

[0019] Furthermore, the process of using the collision detection algorithm includes: developing the collision detection algorithm using a programming language; importing the pre-formed part model and the nozzle / tool ​​model into the same coordinate system; setting the position coordinates of the machining point and the axis vector of the nozzle / tool ​​to simulate the situation of the nozzle / tool ​​at any machining point position; determining whether the nozzle / tool ​​model intersects with the pre-formed part model; setting a dividing plane perpendicular to the centroidal axis at the collision position; and iteratively solving to obtain the region division scheme with the fewest segments.

[0020] Furthermore, the process of generating specific additive and subtractive manufacturing processes includes: using process planning software to plan processes according to the area division scheme; offsetting each segmented flow channel by a certain distance on the inner and outer walls and end faces as a machining allowance; and removing this allowance during subtractive manufacturing.

[0021] Furthermore, the subtractive processing steps include: face milling to remove end face offset allowance; inner wall milling to remove inner wall offset allowance; outer wall milling to remove outer wall offset allowance; and for intersecting flow channel areas, hole milling is used to obtain complete flow channels.

[0022] Furthermore, the post-processing process includes: matching a suitable five-axis additive and subtractive manufacturing equipment; generating actual machining code; and operating the machine tool to execute the code to complete the machining.

[0023] Furthermore, the method also includes adding an auxiliary flow channel; the auxiliary flow channel is formed by offsetting downward by a certain distance to avoid collision between the nozzle / tool ​​and the machine tool base during five-axis machining.

[0024] Specifically, the implementation process of this embodiment includes the following steps: Step 1: Analyze the characteristic structure of the flow channel and optimize its structure as necessary, considering the processing method for additive and subtractive manufacturing. Divide the multi-channel structure into several single-channel structures.

[0025] Step 2: Set the processing strategy to process each single flow channel one by one, and the direction of additive processing is to process along the centroidal axis, so as to meet the unsupported constraints of additive and subtractive composite manufacturing.

[0026] Step 3: Develop a collision detection algorithm using a programming language, importing the nozzle / tool ​​model and the finished part model at any processing point into the same coordinate system; the coordinates of any processing point can be obtained from the part model. x,y,z The strategy of machining along the centroidal axis ensures that any machining point of the flow channel part can uniquely correspond to the tangent vector of its centroidal axis. t For additive manufacturing, the nozzle axis vector a Tangent vector to the centroidal axis corresponding to the current machining point t The same. Therefore, import the coordinates of the machining points ( x,y,z ) and the corresponding centroidal axis vector t This allows us to obtain the model of the nozzle at any machining position; for subtractive machining, the tool axis vector... a It needs to be the tangent vector of the centroidal axis t Tilt angle of rotary cutting tool θ Obtain. Set the normal vector of the plane where the rotation operation occurs. n To ensure the obtained tool axis vector a To ensure uniqueness, the tool's axis vector is obtained using the Rodriguez rotation formula. a Therefore, the coordinates of the imported processing points ( x,y,z ) and the corresponding centroidal axis vector t And set the tool tilt angle θ and the normal vector of the plane of rotation n This allows us to obtain the model of the tool at any machining position. By determining whether the nozzle / tool ​​model intersects with the part model in the same coordinate system, we can determine whether a collision occurs at any machining position during the addition and subtraction of materials in the flow channel. At the collision position, we pre-set a dividing plane perpendicular to the centroidal axis. We iteratively solve all dividing planes to obtain the region division scheme with the fewest segments.

[0027] Among them, solving for the axis vector of the tool. a The Rodriguez rotation formula is as follows: .

[0028] Step 4: Using process planning software, perform process planning for each segmented area based on the obtained alternating increase and decrease area division scheme. A certain distance is offset between the inner and outer walls and end faces of each segment's flow channel as a machining allowance, which is then removed during subtractive processing to obtain a high-quality machined surface.

[0029] Step 5: Match the generated additive and subtractive manufacturing process with a suitable five-axis additive and subtractive composite manufacturing equipment, generate the actual machining code through post-processing, and operate the machine tool to execute the machining code to complete the machining.

[0030] Example 1 This embodiment focuses on the planning method for additive and subtractive material processes in straight flow channels, such as... Figure 2 and Figure 3 As shown.

[0031] The machining of straight flow channels adopts a five-axis alternating additive and subtractive machining method. The specific steps are as follows: Step 1: Since the straight flow channel structure has no room for optimization when it is optimized for additive and subtractive composite manufacturing, and it is a single flow channel, there is no need to optimize or split it.

[0032] Step 2: Extract the centroidal axis of the straight flow channel structure, determine the bottom surface to be machined, and the machining strategy is to machine along the centroidal axis.

[0033] Step 3: Using a collision detection algorithm, determine whether there is no collision between the nozzle and the cutting tool to obtain the process division result of the part, which is divided into three segments, such as... Figure 3 As shown.

[0034] Step 4: Use process planning software to plan the process according to the obtained alternating addition and subtraction area division scheme. Offset the straight flow channel downward by a certain distance as the wire cutting position. The specific addition and subtraction machining process is as follows: Addition of straight flow channel segment 1 - Milling of straight flow channel segment 1 face - Milling of straight flow channel segment 1 inner wall - Addition of straight flow channel segment 2 - Milling of straight flow channel segment 2 face - Milling of straight flow channel segment 2 inner wall - Addition of straight flow channel segment 3 - Milling of straight flow channel segment 3 face - Milling of straight flow channel segment 3 inner wall - Milling of the entire outer wall of the straight flow channel.

[0035] Step 5: Match the generated additive / subtractive manufacturing process with a suitable five-axis additive / subtractive composite manufacturing equipment. Generate actual machining code through post-processing, and operate the machine tool to execute the machining code to complete the machining. Wire EDM is used to perform wire cutting at five wire cutting positions to obtain the straight flow channel obtained from the actual machining of the additive / subtractive material.

[0036] Example 2 This embodiment focuses on the planning method for additive and subtractive material processes in curved flow channels, such as... Figures 4 to 6 As shown.

[0037] The machining of curved flow channels adopts a five-axis additive and subtractive machining method, and the specific steps are as follows: Step 1: Traditional curved flow channel structures are limited by processing methods, resulting in right-angle bends and process holes. This type of bend leads to high pressure loss in actual hydraulic systems. Additive-subtractive manufacturing offers high processing freedom. Using design methods oriented towards additive-subtractive manufacturing, right-angle bends can be optimized into curved flow channels with rounded transitions for processing, such as... Figure 4 As shown.

[0038] Step 2: Extract the centroidal axis of the curved flow channel structure, determine the machining bottom surface, and the machining strategy is to machine along the centroidal axis.

[0039] Step 3: Using a collision detection algorithm, determine whether there is no collision between the nozzle and the cutting tool to obtain the process division result of the part, which is divided into three segments, such as... Figure 6 As shown.

[0040] Step 4: Use process planning software to plan the process according to the obtained alternating addition and subtraction area division scheme. Offset the curved flow channel downwards by a certain distance as an auxiliary flow channel to ensure that the nozzle, tool, and spindle do not collide with the machine tool base during five-axis machining of the curved section. The specific addition and subtraction machining process is as follows: Addition of curved flow channel auxiliary flow channel 9 - Milling of curved flow channel auxiliary flow channel 9 face - Addition of curved flow channel first section 6 - Milling of curved flow channel first section 6 face - Milling of curved flow channel first section 6 inner wall - Addition of curved flow channel second section 7 - Milling of curved flow channel second section 7 face - Milling of curved flow channel second section 7 inner wall - Addition of curved flow channel third section 8 - Milling of curved flow channel third section 8 face - Milling of curved flow channel third section 8 inner wall - Milling of curved flow channel overall outer wall.

[0041] Step 5: Match the generated additive / subtractive manufacturing process with a suitable five-axis additive / subtractive composite manufacturing equipment. Generate actual machining code through post-processing, and operate the machine tool to execute the machining code to complete the machining. Wire EDM is used to perform wire EDM at position 11 to obtain the curved flow channel obtained from the actual machining of the additive / subtractive material.

[0042] Example 3 This embodiment focuses on the planning method for additive and subtractive material processes in cross-flow channels, such as... Figure 7 and 8 As shown.

[0043] The machining of the crossflow channels adopts a five-axis alternating additive and subtractive machining method, and the specific steps are as follows: Step 1: The cross-flow channel selected in this embodiment can be divided into two single flow channels, namely the main flow channel and the secondary flow channel, both of which are straight flow channels.

[0044] Step 2: Extract the centroidal axis of the main flow channel and the secondary flow channel of the cross flow channel, determine the machining bottom surface, and the machining strategy is to first machine the main flow channel along the centroidal axis, and then machine the secondary flow channel along the centroidal axis.

[0045] Step 3: Using a collision detection algorithm, determine whether there is no collision between the nozzle and the cutting tool to obtain the process division result of the part, which is divided into four segments, such as... Figure 8 As shown.

[0046] Step 4: Use process planning software to plan the process according to the obtained alternating addition and subtraction area division scheme. Offset the main channel of the crossflow channel downward by a certain distance to serve as an auxiliary channel to ensure that the nozzle, tool, and spindle do not collide with the machine tool base during the five-axis machining of the auxiliary channel. The specific addition and subtraction machining process is as follows: Addition of crossflow auxiliary channel 16 - Milling of crossflow auxiliary channel 16 face - Addition of crossflow first section 12 - Milling of crossflow first section 12 face - Milling of crossflow first section 12 inner wall - Addition of crossflow second section 13 - Milling of crossflow second section 13 face - Milling of crossflow second section 13 inner wall - Addition of crossflow third section 14 - Milling of crossflow third section 14 face - Milling of crossflow third section 14 inner wall - Milling of holes at the channel intersection - Addition of crossflow fourth section 15 - Milling of crossflow fourth section 15 inner wall - Milling of the entire outer wall of the crossflow channel.

[0047] Step 5: Match the generated additive / subtractive manufacturing process with a suitable five-axis additive / subtractive composite manufacturing equipment. Generate actual machining code through post-processing, and operate the machine tool to execute the machining code to complete the machining. Wire EDM is used to perform wire EDM at position 18 of the crossflow channel to obtain the crossflow channel obtained from the actual additive / subtractive machining.

[0048] This invention discloses a method for planning additive-subtractive composite manufacturing processes based on the structural characteristics of basic flow channels. By setting a machining strategy along the centroidal axis of the flow channel, it satisfies the additive-subtractive process constraint of unsupported inner walls of the flow channel. Furthermore, by developing a collision detection algorithm, it ensures that the nozzle / tool ​​does not collide with the formed parts during machining, satisfying the collision-free additive-subtractive process constraint and obtaining a machining area division scheme with the fewest segments. Therefore, this invention provides an efficient additive-subtractive process planning scheme for flow channels with unsupported inner walls and collision-free machining. In addition, this invention considers the additive-subtractive composite manufacturing process for more complex flow channel structures. By breaking down complex multi-flow channel structures into multiple single flow channels for separate machining, and obtaining complete flow channels at the intersection points of intersecting flow channels through milling, it provides guidance for planning additive-subtractive composite manufacturing processes for more complex flow channel structures.

[0049] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for planning additive and subtractive composite manufacturing processes based on the structural characteristics of basic flow channels, characterized in that, include: S1. Analyze the characteristic structure of the flow channel, optimize the flow channel for additive and subtractive composite manufacturing, and decompose the multi-flow channel structure into multiple single-flow channel structures. S2. Set the processing strategy to process each single flow channel sequentially, and the single flow channel additive processing strategy to process along the mandrel. S3. Using a collision detection algorithm, the processing area segmentation plane is solved iteratively along the centroidal axis of the flow channel to obtain a flow channel alternating region division scheme. S4. Generate specific additive and subtractive manufacturing processes; S5. Post-processing generates machining code, which is then imported into additive and subtractive composite manufacturing equipment for processing.

2. The additive and subtractive composite manufacturing process planning method based on the structural characteristics of the basic flow channel as described in claim 1, characterized in that, The process of analyzing the characteristic structure of the flow channel includes: optimizing the geometric features of the flow channel for additive and subtractive composite manufacturing, changing the curved flow channel from a right-angle bend to a circular arc transition form; and splitting the multi-flow channel structure into multiple single-flow channel structures, including the main flow channel and the secondary flow channel.

3. The additive and subtractive composite manufacturing process planning method based on the structural characteristics of the basic flow channel as described in claim 1, characterized in that, The process of setting the processing strategy includes: processing each single flow channel sequentially, with the additive processing direction along the centroidal axis, to ensure that the inner wall of the flow channel is unsupported.

4. The additive and subtractive composite manufacturing process planning method based on the structural characteristics of the basic flow channel as described in claim 1, characterized in that, The process of using a collision detection algorithm includes: developing the collision detection algorithm using a programming language; importing the pre-formed part model and the nozzle / tool ​​model into the same coordinate system; and importing the coordinates of the machining points. x,y,z ) and the corresponding centroidal axis vector t Used to obtain the model of the nozzle at any processing position; import the coordinates of the processing point ( x,y,z ) and the corresponding centroidal axis vector t And set the tool tilt angle θ and the normal vector of the plane of rotation n Used to obtain the model of the tool at any machining position; to determine whether there is a collision by judging whether the nozzle / tool ​​model intersects with the model of the formed part; to set a dividing plane perpendicular to the centroid axis at the collision position; to obtain the machining area division scheme with the fewest segments by iterative solution.

5. The additive and subtractive composite manufacturing process planning method based on the structural characteristics of the basic flow channel as described in claim 1, characterized in that, The process of generating specific additive and subtractive manufacturing operations includes: using process planning software to plan the operations according to the area division scheme; setting a certain distance on the inner and outer walls and end faces of each segmented flow channel as a machining allowance; and removing this allowance during subtractive manufacturing.

6. The additive and subtractive composite manufacturing process planning method based on the structural characteristics of the basic flow channel as described in claim 1, characterized in that, The subtractive machining process includes: face milling to remove end face offset allowance; inner wall milling to remove inner wall offset allowance; outer wall milling to remove outer wall offset allowance; and for intersecting flow channel areas, hole milling is used to obtain complete flow channels.

7. The additive and subtractive composite manufacturing process planning method based on the structural characteristics of the basic flow channel as described in claim 1, characterized in that, The post-processing process includes: matching a suitable five-axis additive and subtractive manufacturing equipment; generating actual machining code; and operating the machine tool to execute the code to complete the machining.

8. The additive and subtractive composite manufacturing process planning method based on the structural features of the basic flow channel as described in claim 1, characterized in that, The method also includes adding an auxiliary flow channel; the auxiliary flow channel is formed by offsetting downward by a certain distance to avoid collision between the nozzle / tool ​​and the machine tool base during five-axis machining.

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