Complex thin-walled part equal-material-additive composite manufacturing method based on cold spraying and thin-walled part

Abstract

The application provides a cold spraying-based equal-material-additive composite manufacturing method for a complex thin-walled part and the thin-walled part, and comprises the following steps: an equal-material machining step of an aluminum alloy plate material and a blank: a preforming of a main structure of a thin-walled part is realized by using an equal-material manufacturing process; a sand blasting step of a preformed main part: a region needing additive machining on the preformed part is subjected to sand blasting treatment; a preheating step: the base material of the whole preformed part is preheated, so that the temperature of the base material is kept constant during the whole cold spraying process; a cold spraying and interpenetrating short-time low-temperature annealing step: an additive manufacturing is performed on the region needing additive machining by using a cold spraying method; and during the cold spraying process, every time the spraying pass is increased by a preset number of times, the cold spraying additive manufacturing part is subjected to low-temperature annealing for a preset length of time; and a machining step: after the cold spraying process is completed, machining is performed according to the size requirement of the part, so that a complex thin-walled part with high precision is obtained.

Description

Technical Field

[0001] This invention relates to the field of composite processing technology, specifically to a method for manufacturing complex thin-walled parts based on cold spraying and additive composite manufacturing of such parts, enabling high-efficiency, high-precision, and high-performance manufacturing of complex thin-walled aluminum alloy parts. Background Technology

[0002] The efficient manufacturing of high-performance, lightweight thin-walled parts is crucial for the rapid development of large aerospace transportation equipment such as aircraft and rockets. The alloy materials used are continuously evolving towards lower density and higher strength, with high-strength aluminum alloys such as 2024 and 7075 already developed. Currently, the main industrial production methods for these thin-walled parts include machining, casting, extrusion, and welding. Machining is a subtractive manufacturing process that can produce complex-shaped thin-walled parts, but it suffers from low material utilization, low efficiency, and high cost. Furthermore, the machining process can disrupt the metal flow lines at the rounded corners of the parts, leading to reduced component performance. Precision casting often produces parts with coarse grains and compositional segregation, limiting its application to parts with low mechanical performance requirements. Extrusion molding generally only produces thin-walled parts with simple cross-sectional shapes, and the high deformation resistance during extrusion places high demands on the overall load capacity of the extrusion equipment. Welding can achieve efficient machining of complex-shaped thin-walled parts, but welding defects such as porosity, slag, and incomplete fusion often occur at the weld joints.

[0003] Patent CN115351514A (application number: 202211125395.9) discloses a method for manufacturing an aluminum alloy ribbed panel by welding a skin and stiffeners configured in a T-shape. Compared to the aforementioned fusion welding process, friction stir welding can effectively reduce the area affected by the "melting-solidification" process of the material during welding. However, due to the high thermal conductivity, large coefficient of linear expansion, and poor surface resistance to high-temperature oxidation of high-strength aluminum alloys, it is still difficult to avoid deformation of the panel and stiffeners at the welding site caused by uneven welding stress, which damages the mechanical properties of thin-walled parts and reduces the dimensional accuracy of the components.

[0004] Patent CN115238328A (application number: 202210755323.6) discloses an arc additive manufacturing method for thin-walled aluminum alloy shells with longitudinal internal stiffeners. Based on three-dimensional numerical modeling, a layer-by-layer stacking method can achieve high-precision manufacturing of ribbed thin-walled parts, and can process complex irregular cross-sectional rib structures. Small molten pool melting can ensure the uniformity of component composition and avoid casting and welding defects such as porosity and segregation. However, due to the high energy input to the thin-walled components during arc additive manufacturing, the local temperature rise of the material can be large, which can easily cause unnecessary thermal damage to the components or even melt-through of the shell. In addition, there is often a high residual tensile stress inside the components, which leads to a decrease in the mechanical properties of the parts and deviations in the overall dimensions of the parts. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method for manufacturing complex thin-walled parts using equal-material additive composite manufacturing based on cold spraying, and the thin-walled parts themselves.

[0006] A method for manufacturing complex thin-walled parts using equal-material additive composite manufacturing based on cold spraying, according to the present invention, includes:

[0007] Equal material processing steps for aluminum alloy sheets and blanks: Pre-forming of the main structure of thin-walled parts is achieved using equal material manufacturing processes;

[0008] Sandblasting and preheating steps for preformed main components: Sandblast the areas on the preformed components that require additive manufacturing; preheat the substrate of the entire preformed component, keeping the substrate temperature constant throughout the cold spraying process;

[0009] Cold spraying and short-time low-temperature annealing steps: The area to be additively manufactured is manufactured by cold spraying; and during the cold spraying process, for each additional preset number of spray passes, the cold-sprayed additive manufacturing part is subjected to a low-temperature annealing of preset duration.

[0010] Machining steps: After the cold spraying process is completed, machining is performed according to the size requirements of the parts to obtain high-precision complex thin-walled parts.

[0011] Preferably, the material processing steps for the aluminum alloy sheet and blank involve: using a material manufacturing process including forging or stamping to pre-form the main structure of the thin-walled part.

[0012] Preferably, the types of aluminum alloy sheets and blanks used include 6061, 2024 or 7075 medium and high strength aluminum alloys; the heat treatment states include W state, O state or T4 state.

[0013] Preferably, the sandblasting and preheating step of the preformed main body is to use quartz to sandblast the areas of the preformed part that need to be additively processed, and make its surface roughness meet the preset requirements.

[0014] Preferably, the sandblasting and preheating step of the preformed main body is to preheat the substrate of the entire preformed component by means of quartz lamp irradiation.

[0015] Preferably, after the sandblasting process is completed, the preformed part is preheated and cold spray additive manufacturing is carried out within a preset time. The material is sprayed repeatedly at the sandblasting location to build up the required additive manufacturing structure layer by layer.

[0016] Preferably, the short-time low-temperature annealing step between the cold spraying and the interleaving process is performed as follows:

[0017] Step S3.1: Construct a three-dimensional model based on the shape and size characteristics of the complex thin-walled aluminum alloy component to be processed, and construct an XYZ three-axis coordinate system with the substrate surface as the reference plane;

[0018] Step S3.2: Plan the cold spraying path according to the specific size and shape of the additively manufactured part;

[0019] Step S3.3: Set the cold spraying parameters according to the type of spraying powder, particle size, and substrate material characteristics;

[0020] Step S3.4: During the cold spraying process, for each additional preset number of spraying passes, the cold sprayed additive manufacturing part is subjected to low-temperature annealing for a preset duration using quartz lamp irradiation.

[0021] Preferably, step S3.3 uses the following cold spraying parameters: gas pressure of 5-5.5 MPa, gas heating temperature of 450-500℃, powder feeding distance of 20 mm, powder feeding rate of 20 g / min, spray gun lateral movement speed of 100 mm / s, and spraying angle of 90°.

[0022] Preferably, the machining step involves machining the part according to its size requirements after the cold spraying process, using a cutting method to machine the required part shape, thereby obtaining a high-precision complex thin-walled part.

[0023] According to the present invention, a thin-walled part is manufactured using the above-described cold spray-based material-additive composite manufacturing method for complex thin-walled parts.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. This invention proposes a novel processing technology for complex thin-walled components. By using a cold spraying method, the remaining feature parts of the part are additively manufactured on a preform made of the same material at room temperature or low temperature (not higher than 100°C). The processing and production of aluminum alloy complex structure thin-walled parts is completed without causing any thermal damage to the base part.

[0026] 2. This invention combines cold spraying with intermittent short-time low-temperature annealing and uses quartz lamp irradiation heating to achieve the "heating-heat preservation" process of cold spraying materials in a very short time. This allows the high dislocation density content cold spraying materials to soften and recrystallize without affecting the performance of the matrix, achieving coordinated and unified performance between equal-material parts and additive parts, and ensuring the stable and reliable performance of the parts.

[0027] 3. This invention utilizes a composite processing method combining equal-material manufacturing and cold-spray additive manufacturing to produce complex thin-walled aluminum alloy parts with fine overall grains, uniform microstructure, and stable performance. This effectively avoids "melting-solidification" defects such as porosity, cracks, coarse grains, and residual tensile stress that are common in traditional manufacturing methods like casting or welding. It achieves high-efficiency, high-precision, and high-performance manufacturing of complex thin-walled parts without the need for subsequent heat treatment.

[0028] 4. The aluminum alloy thin-walled components obtained by additive manufacturing of equal materials and cold spraying according to the present invention have an overall strength of over 300 MPa, an elongation of over 5%, and dimensional accuracy deviation controlled below 0.1 mm. Attached Figure Description

[0029] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 This is a flowchart of a material-additive composite manufacturing method for complex thin-walled aluminum alloy parts based on cold spraying.

[0031] Figure 2 This is a schematic diagram of sheet metal or blank material for processing equal materials.

[0032] Figure 3 This is a schematic diagram of the sandblasting and preheating process for prefabricated parts in Example 2.

[0033] Figure 4 This is a schematic diagram of the cold spraying and short-time low-temperature annealing process in Example 2.

[0034] Figure 5 This is a schematic diagram of the material microstructure evolution of the additive part during the low-temperature annealing process of the present invention.

[0035] Figure 6 This is a schematic diagram of the sandblasting and preheating process for Example 3.

[0036] Figure 7 This is a schematic diagram of the cold spraying and short-time low-temperature annealing process in Example 3.

[0037] Figure 8 This is a schematic diagram of the sandblasting and preheating process for Example 4.

[0038] Figure 9 This is a schematic diagram of the cold spraying and short-time low-temperature annealing process in Example 4.

[0039] Figure 10 This is a schematic diagram of the overall process in Example 4.

[0040] Among them: 1-Sheet material, 2-Prefabricated short-ribbed wall panel, 3-Sandblasting area, 4-Quartz lamp irradiation device, 5-Cold spray additive longitudinal and transverse ribs, 6-Cold spray spray gun, 7-Cylindrical cap prefabricated part, 8-Large cold spray additive connection port, 9-Small cold spray additive connection port. Detailed Implementation

[0041] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0042] This invention provides a composite manufacturing method for complex thin-walled aluminum alloy parts using equal-material and cold-spray additive manufacturing. This method enables high-efficiency, high-precision, and high-performance processing of complex thin-walled parts with lower heat input and shorter processing time. This method combines traditional equal-material manufacturing processes with cold-spray additive manufacturing, and optimizes the microstructure of the additive components through interspersed low-temperature annealing. This achieves performance coordination between the equal-material and additive components, enabling the processing of complex thin-walled parts at temperatures far below the material's melting point, without thermal damage or unnecessary phase transformations. Cold-spray additive manufacturing offers high deposition efficiency and is not limited by part size, meeting the production requirements of large components. Cold spraying is a cold additive manufacturing technology, with a maximum processing temperature not exceeding 450°C, making it particularly suitable for processing materials with high heat sensitivity and high-temperature oxidation.

[0043] Example 1

[0044] According to the present invention, a method for manufacturing complex thin-walled parts using equal-material additive composite manufacturing based on cold spraying is provided, such as... Figure 1 As shown, it includes:

[0045] Equal material processing steps for aluminum alloy sheets and blanks: Before cold spraying, the main structure of thin-walled parts is pre-formed using traditional equal material manufacturing processes such as forging and stamping.

[0046] Sandblasting and preheating steps for preformed main body: Sandblast the areas on the preformed part that need to be processed by additive manufacturing; Preheat the substrate of the entire preformed part by quartz lamp irradiation, and keep the temperature of the substrate constant throughout the cold spraying process.

[0047] Cold spraying and short-time low-temperature annealing steps: Cold spraying is used to achieve additive manufacturing of complex structures in thin-walled components that are difficult to form using traditional equal-material manufacturing methods; and during the cold spraying process, for each additional preset number of spraying passes, the cold-sprayed additive manufacturing part is subjected to a low-temperature annealing of a preset duration.

[0048] Machining steps: After the cold spraying process is completed, machining is carried out according to the size requirements of the parts. The required part shape is processed by cutting to obtain high-precision complex thin-walled parts.

[0049] Specifically, in the material processing steps of aluminum alloy sheets and billets, the types of aluminum alloy sheets and billets used are medium and high strength aluminum alloys such as 6061, 2024, and 7075, and the heat treatment states are W state, O state, T4 state, etc.

[0050] Specifically, in the equal-material processing steps of aluminum alloy sheets and blanks, the pre-formed parts processed by the equal-material processing method include: thin-walled cylindrical parts processed by stamping, and short-ribbed panel-type parts processed by forging, etc.

[0051] Specifically, in the sandblasting and preheating step of the preformed main body, the abrasive used for sandblasting is quartz, and the sandblasting location is the area that needs to be cold sprayed additive processing, so that the surface roughness reaches about 15μm.

[0052] Specifically, in the sandblasting and preheating step of the preformed main body, after the sandblasting treatment is completed, the entire preformed part is preheated by quartz lamp irradiation. The preheating temperature range is 170℃-200℃, and this temperature is kept constant throughout the entire cold spraying process.

[0053] Specifically, in the sandblasting and preheating step of the preformed main body, for 6-series aluminum alloys with good plasticity, the preheating temperature should be selected in a lower range of 170-180℃; for harder 2-series and 7-series aluminum alloys, the preheating temperature should be selected in a higher range of 180-200℃.

[0054] Specifically, in the short-time low-temperature annealing step between cold spraying and interleaving, after the sandblasting is completed, the pre-formed part needs to be preheated and cold spray additive manufacturing processed within 24 hours. The required additive manufacturing structure is built up layer by layer by reciprocating spraying at the sandblasting position.

[0055] Specifically, in the short-time low-temperature annealing step between cold spraying and interleaving, the cold spraying parameters are set as follows: gas pressure 5-5.5MPa, gas heating temperature 450-500℃, powder feeding distance 20mm, powder feeding rate 20g / min, spray gun lateral movement speed 100mm / s, and spraying angle 90°.

[0056] Specifically, in the short-time low-temperature annealing step between cold spraying and interleaving, the powder selected is gas-atomized aluminum alloy powder or annealed powder, with a particle size mainly distributed in the range of 20-55μm, an average particle size of 35μm, and a shape mainly spherical or near-spherical.

[0057] Specifically, in the short-time low-temperature annealing step between cold spraying and interleaving, the method for obtaining annealed powder is as follows: post-treatment annealing is performed on the gas atomized powder, the annealing temperature is selected as 460-500℃, the annealing time is selected as 1-2h, and the protective atmosphere is selected as nitrogen or argon.

[0058] Specifically, in the cold spraying and interleaved short-time low-temperature annealing steps, the interleaved short-time low-temperature annealing temperature is 450℃-500℃, the heating rate is 50℃ / s, the holding time is 30s-60s, and the heating method is quartz lamp irradiation.

[0059] Specifically, in the short-time low-temperature annealing step between cold spraying and interleaving, 6-series aluminum alloy deposits undergo more intense plastic deformation and have a higher internal dislocation content during cold spraying. A lower temperature of 450-480℃ and a holding time of 30-50s are more suitable. 2-series and 7-series aluminum alloy deposits have a lower internal dislocation content and are more difficult to recrystallize. A higher temperature of 480-500℃ and a holding time of 50-60s are more suitable.

[0060] Specifically, in the machining step, after the cold spraying process is completed, machining is carried out according to the size requirements of the part. The required part shape is processed by cutting to obtain a high-precision complex thin-walled part, and the dimensional accuracy deviation is controlled below 0.1mm.

[0061] Example 2

[0062] Example 2 is a preferred example of Example 1.

[0063] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the integrated processing of high-ribbed wall panels is achieved through isothermal forging combined with cold spray additive manufacturing. The specific processing mainly includes three steps:

[0064] The steps for producing the prefabricated short rib substrate by isothermal forging are as follows: 1. Take a 2024-T351 aluminum alloy thick plate 1 with dimensions of 150×150×6.35mm and grow short longitudinal and transverse ribs with a height of 3mm and a width of 10mm by isothermal extrusion at 500℃.

[0065] Sandblasting and preheating steps for the short-ribbed wall panel: Sandblast the locations of the longitudinal and transverse ribs on the short-ribbed wall panel 2, such as... Figure 3 As shown in sandblasting area 3, the oxide scale at this location is removed and the surface roughness is increased to about 15μm, so as to improve the powder deposition efficiency during cold spraying and improve the bonding strength between the rib and the substrate. Then, the entire short rib wall panel is preheated from the bottom by irradiation with quartz lamp 4 at a preheating temperature of 200℃, and this temperature is kept constant throughout the cold spraying process.

[0066] Cold spraying and short-time low-temperature annealing steps: The PCS1000 high-pressure cold spraying system 6 from Japan Plasma Technology Co., Ltd. was used for cold spraying additive manufacturing of the longitudinal and transverse ribs, increasing the height of the ribs 5 by 12mm. The powder used was gas-atomized 2024 aluminum alloy powder, with a particle size mainly distributed between 20-50μm, an average particle size of 35μm, and a shape mainly spherical or near-spherical. The cold spraying parameters were set as follows: gas pressure 5.5MPa, gas heating temperature 500℃, powder feeding distance 20mm, powder feeding rate 20g / min, spray gun lateral movement speed 100mm / s, and spraying angle 90°. During the cold spraying process, every five additional spray passes, a short-duration low-temperature annealing is performed on the cold-sprayed additive manufacturing portion of the part from the top using a quartz lamp irradiation method. The annealing temperature is 500℃, the heating rate is 50℃ / s, and the holding time is 60s. The heating method involves quartz lamp irradiation to soften and recrystallize the cold-sprayed material with high dislocation density. The process is as follows: Figure 5 As shown;

[0067] Machining steps: After the cold spraying process, machining is performed according to the part's dimensional requirements. The required rib shapes are machined using cutting methods to improve the dimensional accuracy of the parts. The final aluminum alloy thin-walled component has an overall strength of over 320 MPa, an elongation of over 5%, and a dimensional accuracy deviation controlled below 0.1 mm.

[0068] Example 3

[0069] Example 3 is a preferred example of Example 1.

[0070] like Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, high-ribbed wall panels are integrated through cold spray additive manufacturing directly on flat rolled plates. The specific processing mainly includes three steps:

[0071] The steps for producing the prefabricated short-rib substrate by isothermal forging are as follows: The aluminum alloy substrate is produced by rolling. The substrate is made of 6061 aluminum alloy, heat treated to O state, and has a size of 150×150×5mm.

[0072] Sandblasting and preheating steps for the substrate: The area containing the ribs on substrate 1 is sandblasted using a sandblasting device, such as... Figure 6 As shown in sandblasting area 3, the sandblasting area is 150×5mm in size and includes two longitudinal and two transverse lines. The oxide scale in this area is removed and the surface roughness is improved to about 15μm, so as to improve the powder deposition efficiency during cold spraying and improve the bonding strength between the rib and the substrate. Then, the entire short rib wall panel is preheated from the bottom by irradiation with quartz lamp 4. The preheating temperature is 170℃ and this temperature is kept constant throughout the cold spraying process.

[0073] Cold spraying and short-time low-temperature annealing steps: The PCS1000 high-pressure cold spraying system 6 from Nippon Plasma Technology Co., Ltd. was used for cold spray additive manufacturing of longitudinal and transverse ribs, growing 20mm high and 5mm wide ribs on the substrate. The powder used was gas-atomized 6061 aluminum alloy powder, with a particle size mainly distributed between 20-50μm, an average particle size of 35μm, and a shape mainly spherical or near-spherical. The cold spraying parameters were set as follows: gas pressure 5MPa, gas heating temperature 450℃, powder feed distance 20mm, powder feed rate 20g / min, spray gun lateral movement speed 100mm / s, and spraying angle 90°. During the cold spraying process, every five additional spray passes, a short-term low-temperature annealing is performed on the cold-sprayed additive manufacturing part from the top of the part using a quartz lamp irradiation method. The annealing temperature is 450℃, the heating rate is 50℃ / s, and the holding time is 30s. The heating method is quartz lamp irradiation. This causes the high dislocation density content cold-sprayed material to soften and recrystallize. The process is as follows: Figure 7 As shown;

[0074] Machining steps: After the cold spraying process, machining is performed according to the part size requirements. The required rib shape is machined by cutting to improve the dimensional accuracy of the part. The final aluminum alloy thin-walled component has an overall strength of over 300 MPa, an elongation of over 7%, and a dimensional accuracy deviation controlled below 0.1 mm.

[0075] Example 4

[0076] Example 4 is a preferred example of Example 1.

[0077] like Figure 2 , Figure 5 , Figure 8 , Figure 9 , Figure 10 As shown, the integrated processing of the fuel tank cap and connector is achieved through thin plate stretching and cold spray additive manufacturing. The specific processing mainly includes four steps:

[0078] The steps for processing cylindrical cap preforms by isothermal deep drawing are as follows: 1. Take a 2024-T3 aluminum alloy sheet 1 with dimensions of 300×300×2mm and form a cylindrical cap preform 7 with a bottom diameter of 150mm and a side wall height of 30mm by isothermal deep drawing at 450℃.

[0079] Sandblasting and preheating steps at the cap connection area: Sandblast the area where the opening of the cap prefabricated part is located, such as... Figure 8 As shown in sandblasting area 3, the oxide scale at this location is removed and the surface roughness is increased to about 15μm, so as to improve the powder deposition efficiency during cold spraying and improve the bonding strength between the rib and the substrate. Then, the entire cover is preheated from the bottom by irradiation with quartz lamp 4 at a preheating temperature of 200℃, and this temperature is kept constant throughout the cold spraying process.

[0080] Cold spraying and short-time low-temperature annealing steps: Cold spraying additive manufacturing was performed using the PCS1000 high-pressure cold spraying system 6 from Japan Plasma Technology Co., Ltd. Two connection ports, one large and one small, were additively manufactured on the cap surface, such as... Figure 9 Connection ports 8 and 9 are shown; the large connection port has an inner diameter of 50mm, a wall thickness of 3mm, and a height of 20mm; the small connection port has an inner diameter of 20mm, a wall thickness of 2mm, and a height of 10mm. The powder used is gas-atomized 2024 aluminum alloy powder, with a particle size mainly distributed between 20-50μm, an average particle size of 35μm, and a shape mainly spherical or near-spherical. The cold spraying parameters are set as follows: gas pressure 5.5MPa, gas heating temperature 500℃, powder feeding distance 20mm, powder feeding rate 20g / min, spray gun lateral movement speed 100mm / s, and spraying angle 90°. During the cold spraying process, every five additional spray passes, a short-term low-temperature annealing is performed on the cold-sprayed additive manufacturing part using a quartz lamp irradiation method. The annealing temperature is 500℃, the heating rate is 50℃ / s, the holding time is 60s, the protective atmosphere is nitrogen, and the heating method is quartz lamp irradiation. This causes the high dislocation density content cold-sprayed material to soften and recrystallize. The process is as follows: Figure 5 As shown;

[0081] Machining steps: After the cold spraying process, machining is performed according to the part's dimensional requirements. The required connection shape is machined using cutting methods to improve the part's dimensional accuracy. A schematic diagram of the entire process is shown below. Figure 10 As shown, the final aluminum alloy cap has an overall strength of over 320 MPa, an elongation of over 5%, and a dimensional accuracy deviation controlled below 0.1 mm.

[0082] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A cold spray based complex thin-walled part isometric-additive hybrid manufacturing method, characterized in that, The method comprises the following steps: The equal-material processing step of the aluminum alloy sheet material and blank: preforming the main structure of the thin-walled part by using an equal-material manufacturing process; The sandblasting preheating step of the preformed main part: sandblasting the area of the preformed part that needs to be additively processed; Preheating the base material of the entire preformed part to keep the temperature of the base material constant during the entire cold spraying process; The cold spraying and intercalated short-time low-temperature annealing step: using cold spraying to additively manufacture the area that needs to be additively processed; and during the cold spraying process, every time the spraying pass increases by a preset number, the cold spraying additively manufactured part is annealed at a preset temperature for a preset time. The short-time low-temperature annealing temperature is 450-500℃, the heating rate is 50℃ / s, the holding time is 30-60s, and the heating mode is quartz lamp irradiation; The machining step: after the cold spraying process is completed, machining is performed according to the size requirements of the part to obtain a high-precision complex thin-walled part.

2. The cold spray based complex thin-walled part equal-material-additive hybrid manufacturing method according to claim 1, characterized in that, The equal-material processing step of the aluminum alloy sheet material and blank uses an equal-material manufacturing process including forging or stamping to preform the main structure of the thin-walled part.

3. The cold spray based complex thin walled equal material-additive hybrid manufacturing method according to claim 1, wherein, The types of aluminum alloy sheet materials and blanks used include 6061, 2024 or 7075 medium-high strength aluminum alloys; and the heat treatment states include W state, O state or T4 state.

4. The cold spray based complex thin walled equal-material-additive composite manufacturing method according to claim 1, characterized in that, The sandblasting preheating step of the preformed main part uses quartz to sandblast the area of the preformed part that needs to be additively processed and make the surface roughness meet the preset requirements.

5. The cold spray based complex thin walled equal-material-additive hybrid manufacturing method according to claim 1, wherein, The sandblasting preheating step of the preformed main part uses quartz lamp irradiation to preheat the base material of the entire preformed part.

6. The cold spray based complex thin walled equal-material-additive hybrid manufacturing method according to claim 1, characterized in that, After the sandblasting process is completed, the preformed part is preheated and cold sprayed for additively manufacturing processing within a preset time. The spraying is reciprocated at the sandblasting position, and the required additively manufactured structure is built layer by layer.

7. The cold spray based complex thin walled equal material-additive hybrid manufacturing method according to claim 1, wherein, The cold spraying and intercalated short-time low-temperature annealing step uses the following steps: Step S3.1: constructing a three-dimensional model according to the shape and size characteristics of the aluminum alloy complex thin-walled component to be processed, and constructing an X-Y-Z three-axis coordinate system with the surface of the base material as the reference plane; Step S3.2: planning the cold spraying path according to the specific size and shape of the additively manufactured part; Step S3.3: setting the cold spraying parameters according to the type and particle size of the sprayed powder and the characteristics of the base material; Step S3.4: during the cold spraying process, every time the spraying pass increases by a preset number, the cold sprayed additively manufactured part is annealed at a preset temperature for a preset time using quartz lamp irradiation.

8. The cold spray based complex thin walled equal material-additive hybrid manufacturing method according to claim 7, characterized in that, Step S3.3 uses the following cold spraying parameter settings: gas pressure is 5-5.5MPa, gas heating temperature is 450-500℃, powder feeding distance is 20mm, powder feeding rate is 20g / min, transverse movement speed of the spray gun is 100mm / s, and the spraying angle is 90°.

9. The cold spray based complex thin walled equal-material-additive hybrid manufacturing method according to claim 1, wherein, The machining step uses the following method: after the cold spraying process is completed, machining is performed according to the size requirements of the part, the required part shape is machined by cutting, and a high-precision complex thin-walled part is obtained.

10. A thin-walled part, characterized by The complex thin-walled part is manufactured by using the cold spraying-based equal-material-additive hybrid manufacturing method according to any one of claims 1-9.

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