Manufacturing method and system for thin-walled storage tank with conformal micro-channel

Abstract

The present invention provides a method and system for manufacturing a conformal, thin-walled tank with micro-channels. The method comprises: constructing a body model of the conformal, thin-walled tank with micro-channels, referred to as a first model; adaptively processing the first model to obtain an intermediate three-dimensional model; simulating the intermediate three-dimensional model to obtain an intermediate anti-compensation model; determining whether the intermediate anti-compensation model meets the allowable range of part deformation deviation; and if so, obtaining an anti-compensation model of the conformal, thin-walled tank with micro-channels, referred to as a second model; if not, resetting the anti-compensation coefficient and performing simulation again until the allowable range of part deformation deviation is met; sectioning the second model to obtain a laser selective melting (LSM) sectioning file; and performing LPBF forming using the sectioned file to obtain the target conformal, thin-walled tank with micro-channels. The present invention utilizes LPBF (laser selective melting) to effectively shorten production cycles, reduce tank weight, and lower manufacturing costs while ensuring tank strength.

Description

Technical Field

[0001] The present invention relates to the field of additive manufacturing technology, and in particular to a method and system for manufacturing a conformal micro-channel thin-walled storage tank. Background Art

[0002] Conventional propulsion system manufacturing technology, using traditional machining and welding methods, results in a distributed propulsion system, with individual units connected by pipelines to supply the working medium. This results in complex structure, heavy weight, low development efficiency, and high manufacturing costs. Additive manufacturing technology is urgently needed to achieve lightweight and modular design and enhance rapid-response manufacturing capabilities. Tanks are a critical component of satellite propulsion systems, and conventional space propulsion system tank piping solutions are complex and occupy a large space, making them difficult to meet the lightweight and integrated needs of small satellites.

[0003] Metal additive manufacturing is a manufacturing method that adds material layer by layer to form three-dimensional complex structural parts. It can achieve integrated manufacturing, shorten the development cycle, and realize rapid design iteration and optimization. However, the application of additive manufacturing technology to domestic space propulsion system tanks is still in its infancy. Different positions of the internal flow channel will exhibit different forms of defects during the forming process: the overhang surface of the microchannel inner hole will produce defects such as powder adhesion and slag, which will reduce the forming quality of the overhang surface; the bottom and side surfaces of the internal flow channel will produce defects such as powder adhesion, cracking, and reduced flatness due to warping, melt pool convection behavior, and melt channel overlap, which will seriously affect the forming quality of the inner surface. During the additive manufacturing process of thin-walled pressure-resistant structures with fine flow channels, multiple thermal cycles will cause a large amount of non-uniformly distributed residual stresses to be generated inside the structure, thereby affecting the dimensional accuracy of the component.

[0004] It is necessary to carry out research on space propulsion system component tank technology based on additive manufacturing to solve the bottleneck problems of deformation of space propulsion system tank components and low internal quality of fine flow channels caused by additive manufacturing technology, which reduce working performance, and realize the application of additively manufactured tanks with fine flow channels inside in the field of space propulsion.

[0005] Patent document CN118218971A discloses a tank based on additive manufacturing, as well as a manufacturing method and application. This method includes: prefabricating the cover, bottom, and barrel of a rocket engine tank; welding the cover, bottom, and barrel to form an initial tank; and performing additive manufacturing on each weld area of ​​the initial tank to form the final tank. However, the tank described in this patent document is a large tank for launch vehicles (diameter > 2 meters), which is significantly different from the size and application scenario of this application. Furthermore, the tank described in this patent document is a simple prefabricated solid shell, and no internal piping or flow channels can be designed or formed. Summary of the Invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a method and system for manufacturing a thin-walled storage tank with conformal micro-channels.

[0007] According to the present invention, a method for manufacturing a thin-walled storage tank with a conformal micro-channel is provided, comprising:

[0008] Step S1: Constructing a thin-walled tank body model with conformal micro-channels, referred to as a first model; the first model includes a thin-walled shell 1, conformal micro-channels 2, various pipe interfaces 3, channel inlets and outlets 4, and a process support 5;

[0009] Step S2: Adaptively processing the first model to obtain an intermediate three-dimensional model; the adaptive processing includes adding a 1mm machining allowance only to the substrate contact surface and high-precision machined surfaces, rounding the sharp edges of all conformal micro-channel thin-walled load-bearing tanks, and adding process supports in areas where the angle between the curved top surface of the conformal micro-channel thin-walled load-bearing tank and the horizontal plane is less than 45°;

[0010] Step S3: Simulating the intermediate three-dimensional model to obtain an intermediate anti-compensation model, including importing the intermediate three-dimensional model into simulation software for simulation calculation, setting printing conditions and simulation parameters, and determining whether the intermediate anti-compensation model meets the allowable range of part deformation deviation. If so, a conformal micro-channel thin-walled tank anti-compensation model is obtained, which is recorded as the second model; if not, resetting the anti-compensation coefficient and simulating again until the allowable range of part deformation deviation is met.

[0011] Step S4: using different process parameters to segment the parts and the corresponding parts of the process support of the second model to obtain a laser selective melting segmentation file;

[0012] Step S5: performing laser selective melting using the segmentation file to obtain a target conformal micro-channel thin-walled load-bearing tank.

[0013] Preferably, the wall thickness of the thin-walled shell is not greater than 2 mm, and the diameter d of the conformal micro-flow channel is ≤ 1 mm;

[0014] All conformal micro-flow channels have no corners or closed loops, and all channel inlets and outlets are treated as trumpet-shaped countersunk holes. Except for the conformal micro-flow channel tank shell itself, there are no tank channel pipelines inside or outside the tank.

[0015] Preferably, the process support is a solid support, a block support and a conical support;

[0016] The block supports are in sheet form, with a thickness of 60 to 100 μm, a spacing of 0.1 to 0.2 mm, and no support offset;

[0017] The conical supports are cylindrical, with a radius of 0.1 to 0.8 mm, an interval of 0.3 to 0.5 mm, and no support offset.

[0018] Preferably, the simulation parameters include: substrate size and thickness, part and process support placement position, powder material brand and printing parameters, allowable range of part deformation deviation, grid division type and grid size parameters, anti-compensation coefficient and maximum allowable anti-compensation steps.

[0019] Preferably, step S3 includes:

[0020] Confirm the size and thickness of the substrate according to the shape of the intermediate model, and confirm the placement of parts and process supports;

[0021] Set the powder material brand and printing parameters, the allowable range of part deformation deviation, the anti-compensation coefficient and the maximum allowable anti-compensation steps; the anti-compensation coefficient is -1.5 to 1.5;

[0022] According to the tank size parameters, select the grid division type and set the grid size parameters.

[0023] Preferably, step S5 includes:

[0024] Step S5.1: Importing the segmentation file into a selective laser melting (SLM) forming machine, performing SLM forming in an argon environment, and obtaining a conformal micro-channel thin-walled load-bearing tank with a substrate;

[0025] Step S5.2: The conformable micro-channel thin-walled load-bearing storage tank with a substrate is subjected to steps including parts powder cleaning, heat treatment, substrate separation and flow channel finishing to obtain the final target conformable micro-channel thin-walled load-bearing storage tank.

[0026] Preferably, the part powder cleaning includes using compressed air, with an air gun muzzle diameter of ≤1mm, and the muzzle is pulsed and sequentially aimed at the trumpet-shaped countersunk holes of each flow channel in the order of flow of the flow channel to remove the powder inside the fine flow channel, and the cleaning time t is ≤10min;

[0027] The heat treatment includes vacuum annealing the conformal micro-channel thin-walled carrying tank with the substrate;

[0028] The substrate separation includes separating the conformal micro-channel thin-walled carrying tank from the substrate by using a reciprocating wire-cut electrical discharge method;

[0029] The flow channel finishing includes a combination of chemical polishing and abrasive flow polishing to finish all the micro flow channels.

[0030] Preferably, the heat treatment process parameters are vacuum degree ≤ 6.7×10-2Pa, heating to 800-900°C at a rate of no more than 20°C / min, keeping the temperature for 3-4 hours, and then cooling with the furnace;

[0031] The substrate separation parameters include an EDM pulse width of 10 to 32 μs, a pulse interval of 110 to 175 μs, and a rectangular pulse waveform;

[0032] In the combination of chemical polishing and abrasive flow polishing, the polishing liquid is a mixed solution of abrasive, nitric acid and hydrofluoric acid, the mixed solution is 50-60°C, the solution flows under 0.3-0.4Mpa, the mixed solution temperature is 30-50°C, and the polishing time is 10-15 minutes.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention is based on the integrated design concept of laser selective melting, combining the thin wall of the tank with the internal and external flow channels of the tank, breaking through the influence of the deformation problem caused by the dual influence of the thin wall and the flow channel on the dimensional accuracy of the tank, and can directly prepare an integrated, internally dense, high-dimensionally accurate, and low-flow channel roughness conformal micro-flow channel thin-walled load-bearing tank. While meeting the functional use of the tank, it reduces the complexity of the internal structure of the space propulsion system, reduces the weight of the tank, and increases the tank capacity, which can significantly increase the sustainable service life of satellites in space and reduce manufacturing costs.

[0035] The various pipes of the tank described in the present invention are integrated with the tank body, that is, all the flow channels are internal flow channels that follow the shape of the tank body. The thinnest flow channel wall thickness is only 0.5mm, and the maximum flow channel diameter is 1mm. This solves the problem of complex external flow channel pipelines and complicated parts of the propulsion system tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0037] Figure 1 This is a schematic diagram of the outer surface structure of the thin-walled load-bearing storage tank with conformal micro-channels according to the present invention;

[0038] Figure 2 Schematic diagram of the flow channel structure of the thin-walled load-bearing tank with conformal micro-flow channels of the present invention;

[0039] Figure 3 A schematic top view of the flow channel structure of the thin-walled load-bearing tank with conformal micro-flow channels according to the present invention;

[0040] Figure 4 Schematic diagram of the simulated deformation of the thin-walled load-bearing tank with conformal micro-channels according to the present invention;

[0041] Figure 5 Schematic diagram of the simulated deformation of the model of the thin-walled load-bearing tank with conformal micro-channel after anti-compensation of the present invention;

[0042] Description of reference numerals:

[0043] 1-Thin-wall shell; 2-Conformal micro-channel; 3-Pipeline interfaces; 4-Flow channel inlet and outlet; 5-Process support. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, without departing from the scope of the present invention, a number of variations and improvements may be made by those skilled in the art. These all fall within the scope of protection of the present invention.

[0045] The present invention provides a method for forming a thin-walled load-bearing tank with a conformal micro-channel by laser selective melting (LPBF). The LPBF forming method can effectively shorten the production cycle, reduce the tank weight while ensuring the tank strength, and lower the manufacturing cost.

[0046] Example 1

[0047] According to the present invention, a method for manufacturing a thin-walled storage tank with a conformal micro-channel is provided, comprising:

[0048] Step S1: Construct a thin-wall tank model with conformal micro-channels, which is referred to as the first model. Figures 1 to 3 As shown, the first model comprises a thin-walled shell 1, conformal microchannels 2, various pipeline interfaces 3, channel inlets and outlets 4, and process support 5. The thin-walled shell has a wall thickness of no more than 2 mm, the conformal microchannels have a diameter d ≤ 1 mm, all conformal microchannels have no corners or closed loops, and all channel inlets and outlets are trumpet-shaped countersunk holes. Aside from the conformal microchannel tank shell itself, no tank channel piping exists within or outside the tank. Preferably, the conformal microchannel thin-walled support tank is made of TC4 titanium alloy, and the equipment used is the Zhongrui Technology iSLM420D. The above steps can be processed using software such as UG, ProE, or Creo.

[0049] Step S2: Adaptively process the first model to obtain an intermediate three-dimensional model. The adaptive processing includes adding a 1mm machining allowance only to the substrate contact surface and the high-precision machined surface, rounding the sharp edges of all conformal micro-channel thin-walled load-bearing tanks, and adding process supports in the area where the angle between the arc top surface of the conformal micro-channel thin-walled load-bearing tank and the horizontal plane is less than 45°. The addition of process supports can be processed by magics software. The process supports are solid supports, block supports and conical supports. The block supports are sheet-shaped, with a thickness of 60 to 100 μm, an interval of 0.1 to 0.2 mm, and no support offset. The conical supports are cylindrical, with a radius of 0.1 to 0.8 mm, an interval of 0.3 to 0.5 mm, and no support offset.

[0050] Step S3: Figure 4 and Figure 5As shown, the intermediate 3D model is simulated to obtain an intermediate anti-compensation model. A determination is made as to whether the intermediate anti-compensation model meets the allowable range for part deformation deviation. If so, a conformal micro-channel thin-walled tank anti-compensation model is obtained, designated as the second model. If not, the anti-compensation coefficient is reset and simulation is repeated until the allowable range for part deformation deviation is met. Step S3 includes importing the intermediate 3D model into simulation software, including Simufact, for simulation and calculation, setting printing conditions and simulation parameters. Specifically, the substrate size and thickness are determined based on the shape of the intermediate model, along with the placement of the part and process supports. The powder material grade and printing parameters, the allowable range for part deformation deviation, the anti-compensation coefficient, and the maximum allowable number of anti-compensation steps are set. The anti-compensation coefficient ranges from -1.5 to 1.5 and is set based on actual compensation results, taking into account various factors such as the product structure and wall thickness. Based on the tank size parameters, a meshing type is selected, and mesh size parameters are set. The meshing types include volume meshing and surface meshing. The powder material grade and substrate material are preferably TC4. For example, based on the intermediate model shape, the substrate size is confirmed to be 300×300×420mm and 50mm thick. The placement of the parts and process supports is then determined. The allowable range for part deformation deviation is set to no more than ±0.1mm, the anti-compensation coefficient is set to -0.85 to -0.9, and the maximum allowable number of anti-compensation steps is set to 10. Based on the tank size parameters, the volume meshing type is selected, and the mesh size parameters are set to 0.5 to 1mm. Furthermore, the allowable range for part deformation deviation is determined by the product's performance and dimensional requirements. For example, if the tank shell's outer surface is not machined and requires a dimensional accuracy of ±0.1mm, if the current intermediate anti-compensation model meets the allowable range for part deformation deviation of ±0.1mm, a conformal micro-channel thin-walled tank anti-compensation model is obtained, designated as the second model. If not, the anti-compensation coefficient is reset based on experience, with different coefficients used for different materials and structures. Simulation calculations are repeated to obtain an anti-compensation model that meets the set allowable range for part deformation deviation of ±0.1mm. This model is then used for printing.

[0051] When setting the anti-compensation conditions, first enter the allowable deformation size requirements of the product size, such as no more than ±0.1mm; set the anti-compensation coefficient, such as -1.0; and start the simulation calculation, which includes the following steps:

[0052] Step 1: Perform deformation simulation on the initial model, i.e., the first model, to predict the deformation trend.

[0053] Step 2: Perform reverse compensation for the deformation of the initial model. For example, if a certain part bulges by 0.5mm, it will be concave by 0.5mm in the opposite direction to obtain the process model.

[0054] Step 3: Perform deformation simulation on the process model, predict the deformation trend, and obtain the intermediate anti-compensation model. If the deformation size is within ±0.1mm, the anti-compensation model, i.e., the second model, is obtained. If it exceeds ±0.1mm, reset the anti-compensation coefficient and iterate the calculation until the deformation size meets the condition of no more than ±0.1mm.

[0055] Whether the intermediate anti-compensation model meets the allowable range of part deformation deviation is determined by the best fitting of the intermediate anti-compensation model and the initial model in the software, and which parts are convex or concave, and the convex and concave values ​​are as follows: Figure 4 As shown, it is within ±0.5mm. If it exceeds the range of ±0.1mm, it is not satisfied, so anti-compensation calculation is required, such as Figure 5 As shown, the anti-compensation model is obtained and the deformation is within the range of ±0.1mm.

[0056] Step S4: Slice the second model to obtain a laser selective melting slice file. Different process parameters are used to slice the corresponding parts of the second model and the process support.

[0057] The process parameters used for the corresponding part of the part are: scanning type is linear filling, scanning spacing is 0.115mm, rotation angle is 67°, powder layer thickness is 0.04mm; laser power is 180~230W, scanning speed is 1000~1300mm / s, and spot compensation is 0.02~0.08mm.

[0058] The process parameters used for the corresponding part of the process support are: scanning type is linear filling, scanning spacing is 0.115mm, rotation angle is 67°, powder layer thickness is 0.04mm; laser power is 170~200W, and scanning speed is 1500~2000mm / s.

[0059] Step S5: Use the segmentation file to perform laser selective melting to obtain the target conformal micro-channel thin-walled load-bearing tank. The step S5 includes importing the segmentation file into the laser selective melting forming equipment, performing laser selective melting in an argon environment to obtain a conformal micro-channel thin-walled load-bearing tank with a substrate, and then performing steps including parts powder cleaning, heat treatment, substrate separation and flow channel finishing on the conformal micro-channel thin-walled load-bearing tank with a substrate. The parts powder cleaning includes using 0.3Mpa compressed air, the air gun muzzle diameter is ≤1mm, and the muzzle is pulsed and sequentially aimed at the trumpet-shaped countersunk holes of each flow channel in the order of flow flow to remove the powder inside the micro-flow channel, and the cleaning time t is ≤10min. The heat treatment includes vacuum annealing the conformal micro-channel thin-walled load-bearing tank with a substrate. The heat treatment process parameters are a vacuum of ≤6.7×10-2Pa, heating at a rate of no more than 20°C / min to 800-900°C, holding for 3-4 hours, and then furnace cooling. The substrate separation involves separating the conformal micro-channel thin-walled carrier tank from the substrate using reciprocating wire-cut electro-discharge (EDM) cutting. The EDM pulse width is 10-32 μs, the pulse interval is 110-175 μs, and the waveform is a rectangular pulse. Process supports are removed manually and mechanically to block the flow channel holes of the conformal micro-channel thin-walled carrier tank. The product blank is sandblasted to obtain the target conformal micro-channel thin-walled carrier tank. Sandblasting can reduce the roughness of the outer surface of the tank. The roots of process supports used in additive manufacturing may remain on the part surface and can also be removed by sandblasting. Furthermore, the outer surface color is uniform, achieving a metallic luster. The flow channel finishing involves a combination of chemical polishing and abrasive flow polishing to finish all the micro-channels. The polishing liquid is a mixed solution of abrasive grains, nitric acid and hydrofluoric acid. The mixed solution is at 50-60° C., the solution flows at 0.3-0.4 MPa, the mixed solution temperature is 30-50° C., and the polishing time is 10-15 minutes.

[0060] The present invention aims to provide a method for forming a thin-walled, conformal, micro-channel load-bearing tank using laser selective melting (LPBF). By integrating the tank's thin wall with internal and external flow channels, LPBF achieves high-quality, efficient, controllable deformation, dense structure, and fine internal flow channels for satellite propulsion systems. This integrated additive manufacturing process effectively shortens production cycles and reduces manufacturing costs while meeting the tank's functional requirements, reducing the complexity of the internal structure, reducing weight, and increasing capacity.

[0061] Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, and units provided by the present invention in purely computer-readable program code, it is entirely possible to implement the same functions of the system and its various devices, modules, and units provided by the present invention in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; the devices, modules, and units for implementing various functions can also be considered as both software modules implementing the method and structures within the hardware component.

[0062] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A method for manufacturing a thin-walled storage tank with a conformal micro-channel, characterized in that: include: Step S1: constructing a thin-walled tank body model with conformal micro-channels, which is referred to as a first model; the first model includes a thin-walled shell (1), conformal micro-channels (2), various pipeline interfaces (3), channel inlets and outlets (4), and process supports (5); Step S2: Adaptively processing the first model to obtain an intermediate three-dimensional model; the adaptive processing includes adding a 1mm machining allowance only to the substrate contact surface and high-precision machined surfaces, rounding the sharp edges of all conformal micro-channel thin-walled load-bearing tanks, and adding process supports in areas where the angle between the curved top surface of the conformal micro-channel thin-walled load-bearing tank and the horizontal plane is less than 45°; Step S3: Simulating the intermediate three-dimensional model to obtain an intermediate anti-compensation model, including importing the intermediate three-dimensional model into simulation software for simulation calculation, setting printing conditions and simulation parameters, and determining whether the intermediate anti-compensation model meets the allowable range of part deformation deviation. If so, a conformal micro-channel thin-walled tank anti-compensation model is obtained, which is recorded as the second model; if not, resetting the anti-compensation coefficient and simulating again until the allowable range of part deformation deviation is met. Step S4: segmenting the parts and the corresponding parts of the process support of the second model using different process parameters to obtain a laser selective melting segmentation file; Step S5: performing laser selective melting using the segmentation file to obtain a target conformal micro-channel thin-walled load-bearing tank.

2. The method for manufacturing a thin-walled tank with a conformal micro-channel according to claim 1, characterized in that: The wall thickness of the thin-walled shell is not greater than 2 mm, and the diameter d of the conformal micro-flow channel is ≤ 1 mm; All conformal micro-flow channels have no corners or closed loops, and all channel inlets and outlets are treated as trumpet-shaped countersunk holes. Except for the conformal micro-flow channel tank shell itself, there are no tank channel pipelines inside or outside the tank.

3. The method for manufacturing a thin-walled tank with conformal micro-channels according to claim 1, characterized in that: The process support includes solid support, block support and tapered support; The block supports are in sheet form, with a thickness of 60 to 100 μm, a spacing of 0.1 to 0.2 mm, and no support offset; The conical supports are cylindrical, with a radius of 0.1 to 0.8 mm, an interval of 0.3 to 0.5 mm, and no support offset.

4. The method for manufacturing a thin-walled tank with conformal micro-channels according to claim 1, characterized in that: The simulation parameters include: substrate size and thickness, part and process support placement, powder material brand and printing parameters, part deformation deviation allowable range, grid division type and grid size parameters, anti-compensation coefficient and maximum allowable anti-compensation steps.

5. The method for manufacturing a thin-walled tank with conformal micro-channels according to claim 1, characterized in that: The step S3 comprises: Confirm the size and thickness of the substrate according to the shape of the intermediate model, and confirm the placement of parts and process supports; Set the powder material brand and printing parameters, the allowable range of part deformation deviation, the anti-compensation coefficient and the maximum allowable anti-compensation steps; the anti-compensation coefficient is -1.5 to 1.5; According to the tank size parameters, select the grid division type and set the grid size parameters.

6. The method for manufacturing a thin-walled storage tank with conformal micro-channels according to claim 1, characterized in that: The step S5 comprises: Step S5.1: Importing the segmentation file into a selective laser melting (SLM) forming machine, performing SLM forming in an argon environment, and obtaining a conformal micro-channel thin-walled load-bearing tank with a substrate; Step S5.2: The conformable micro-channel thin-walled load-bearing storage tank with a substrate is subjected to steps including parts powder cleaning, heat treatment, substrate separation and flow channel finishing to obtain the final target conformable micro-channel thin-walled load-bearing storage tank.

7. The method for manufacturing a thin-walled storage tank with conformal micro-channels according to claim 6, characterized in that: The part powder cleaning includes using compressed air, the diameter of the air gun muzzle is ≤1mm, the muzzle is aimed at the trumpet-shaped countersunk holes of each flow channel in a pulsed manner according to the flow order of the flow channel, and the powder inside the fine flow channel is removed, and the cleaning time t is ≤10min; The heat treatment includes vacuum annealing the conformal micro-channel thin-walled carrying tank with the substrate; The substrate separation includes separating the conformal micro-channel thin-walled carrying tank from the substrate by using a reciprocating wire-cut electrical discharge method; The flow channel finishing includes a combination of chemical polishing and abrasive flow polishing to finish all the micro flow channels.

8. The method for manufacturing a thin-walled storage tank with conformal micro-channels according to claim 7, characterized in that: Heat treatment process parameters are vacuum degree ≤ 6.7×10 -2 Pa, heat to 800-900℃ at a rate of no more than 20℃ / min, keep warm for 3-4h, and then cool with the furnace; The parameters for substrate separation include an EDM pulse width of 10 to 32 μs, a pulse interval of 110 to 175 μs, and a rectangular pulse waveform; In the combination of chemical polishing and abrasive flow polishing, the polishing liquid is a mixed solution of abrasive, nitric acid and hydrofluoric acid, the mixed solution is 50-60°C, the solution flows under 0.3-0.4Mpa, the mixed solution temperature is 30-50°C, and the polishing time is 10-15 minutes.

Images