Manufacturing and production process of laminated composite efficient stirring component

Abstract

The invention relates to the technical field of metal product processing, and particularly discloses a manufacturing and production process of a laminated composite efficient stirring component. The component is prepared from a duplex stainless steel strip as a raw material through the procedures of pretreatment, stamping, stretching, bending, heat treatment, surface treatment and the like. The preparation method comprises the following steps: carrying out electrolytic polishing on a strip, and directly carrying out low-temperature plasma nitriding without cleaning; strip-shaped wires and connecting parts are punched through a multi-station progressive die, and the strip-shaped wires and the connecting parts are bent into a cage body after being gradually stretched through a plurality of groups of roller dies; and then carrying out thermomechanical treatment, carrying out direct ion implantation after micro-arc oxidation, then carrying out subzero treatment, and finally carrying out chemical nickel plating and low-temperature curing. The member can be used for industrial stirring operation and has the advantages of being good in surface quality, high in structural precision and stable in mechanical property; in addition, the preparation method disclosed by the invention has the advantages of high working procedure collaboration, capability of effectively improving the comprehensive performance of the component and coherent and controllable process.

Description

Technical Field

[0001] This application relates to the field of metal product processing technology, and more specifically, it relates to a manufacturing process for a layered composite high-efficiency mixing component. Background Technology

[0002] Layered composite high-efficiency mixing components are important parts used in mixing operations. They achieve high-efficiency mixing through a layered composite structural design and are widely used in industrial production processes requiring mixing and reaction. To meet the demands of high-efficiency mixing, these components must possess excellent surface quality, precise structural dimensions, and stable mechanical properties. This places high demands on their manufacturing process, involving multiple key steps such as strip processing, forming, heat treatment, and surface treatment. The rationality of each step directly affects the final performance of the component.

[0003] In existing manufacturing processes, strip pretreatment typically involves an intermediate cleaning step after electropolishing, followed by plasma nitriding. This can affect the uniformity of the nitrided layer, leading to unstable mechanical properties in the produced components, making it difficult to meet the high-performance requirements of actual mixing operations. Summary of the Invention

[0004] To address the problem in existing technologies where the uniformity of the nitrided layer is poor and the mechanical properties of the component are unstable due to intermediate cleaning and plasma nitriding after electrolytic polishing during strip pretreatment, this application provides a manufacturing process for a layered composite high-efficiency mixing component.

[0005] A manufacturing process for a layered composite high-efficiency mixing component includes the following steps:

[0006] S1. Strip pretreatment: Select duplex stainless steel strip with a thickness of 0.8-1.2mm. First, perform electrolytic polishing treatment with a current density of 15-25A / dm2. After electrolytic polishing treatment, directly perform low-temperature plasma nitriding treatment without intermediate cleaning. The treatment temperature is 450-500℃ and the treatment time is 3-5h.

[0007] S2. Composite stamping forming: Using a multi-station progressive die, one end of the nitrided strip is punched into 12 to 14 strips with a width of 1.8-2.2 mm; a connecting part is punched out at the other end of the strip, which is 2.0-3.0 mm narrower than the original strip, and two notches are symmetrically punched out at the edge of the connecting part, with a width of 2.8-3.2 mm and a depth of 4.5-5.5 mm.

[0008] S3, Multi-directional stretching forming: The stamped components are progressively stretched through multiple sets of roller dies, with a stretching ratio of 1.5 to 2.0. Atomized cooling and lubrication are used during the stretching process.

[0009] S4. Three-dimensional bending forming: The stretched strip wire is bent to form an ellipsoidal cage with a major axis diameter of 90-110mm and a minor axis diameter of 70-90mm.

[0010] S5. Deformation heat treatment: The bent components are subjected to deformation heat treatment at 550-600℃ under a protective atmosphere for 40-80 minutes, and then cooled to room temperature at a rate of 50-80℃ / min.

[0011] S6. Surface composite treatment: First, perform micro-arc oxidation treatment on the heat-treated components. The voltage is 300-400V and the treatment time is 15-25min. After micro-arc oxidation treatment, ion implantation treatment is performed directly without intermediate treatment. The implanted nitrogen ion energy is 70-90keV.

[0012] S7. Dimensional stability treatment: After surface treatment, the components are subjected to deep cryogenic treatment at -80℃ to -100℃ for 2-4 hours, and then warmed to room temperature at a rate of 2-3℃ / min.

[0013] S8. Final surface treatment: The components after cryogenic treatment are chemically plated with nickel with a coating thickness of 8-12μm, and then cured at a low temperature of 180-200℃ for 1-2 hours.

[0014] By adopting the above technical solution, and by selecting duplex stainless steel strip of a specific thickness and performing electrolytic polishing, surface impurities and oxide layers can be removed, resulting in a smoother surface and laying a good foundation for subsequent processing. In this application, the duplex stainless steel strip is a stainless steel material with both austenitic and ferritic phases, with a phase ratio between 40% and 60%. This duplex stainless steel strip is obtained by cutting 2205 duplex stainless steel plates purchased from Shandong Rongsheng Steel Co., Ltd., with the 2205 duplex stainless steel plate part number 01. Electrolytic polishing... Following the initial cleaning, low-temperature plasma nitriding is performed directly. The residual electrolyte assists in nitriding, promoting uniform nitriding layer formation and enhancing the surface hardness and wear resistance of the strip. A specific number and size of strip filaments are punched out using multi-station progressive dies, precisely shaping the filament structure required for mixing and creating conditions for subsequent cage formation. A narrowed connecting section with a notch is punched at the other end of the strip, facilitating connection with other components and dispersing connection stress to improve connection stability. Progressive stretching using multiple sets of roller dies and atomized cooling are then employed. The lubrication process allows for gradual adjustment of the shape and size of the filaments, reducing friction and thermal damage during stretching, thereby ensuring the mechanical properties and dimensional accuracy of the filaments. Atomized cooling lubrication utilizes a 5-8% concentration emulsion at an atomization pressure of 0.3-0.5 MPa and a flow rate of 10-15 L / h. Bending the filaments into ellipsoidal cages of specific sizes creates a suitable spatial structure for stirring, increasing the contact area with materials and improving stirring efficiency. Deformation heat treatment under a protective atmosphere with controlled cooling rate adjusts the internal structure of the component, eliminating processing stress and improving its mechanical properties and stability. Micro-arc oxidation followed by direct ion implantation forms a dense oxide layer on the surface and introduces nitrogen, synergistically enhancing surface modification and improving corrosion resistance and wear resistance. Deep cryogenic treatment with controlled recovery rate further stabilizes the internal structure of the component, reducing dimensional changes during subsequent use and improving dimensional stability. Chemical nickel plating followed by low-temperature curing forms a uniform nickel plating layer on the surface, enhancing protection and extending the component's service life.

[0015] Preferably, in step S1, the electrolyte used for electropolishing is a mixed solution of phosphoric acid, sulfuric acid and glycerol, with a volume ratio of 3:1:0.5 to 4:1:0.8.

[0016] By adopting the above technical solution, while removing impurities and oxide layers from the strip surface, excessive corrosion of the substrate during polishing is reduced, resulting in a more uniform and smooth surface. This provides more suitable surface conditions for subsequent low-temperature plasma nitriding treatment, which helps to improve the quality and uniformity of the nitrided layer.

[0017] Preferably, in step S2, the punching gap of the multi-station progressive die is 6-8% of the material thickness, the punching speed is 200-300 times / minute, and the width of the narrowed connecting part is 12-15mm.

[0018] By adopting the above technical solutions, and setting the punching clearance of the multi-station progressive die to 6-8% of the material thickness, the extrusion and tearing of the strip during the punching process can be reduced, resulting in a smoother and flatter punching surface and avoiding burrs or deformation. Controlling the punching speed can ensure punching efficiency while making the contact and separation between the die and the strip more stable, reducing damage caused by impact. Setting the width of the narrowed connecting part to 12-15mm can make the connection part fit more precisely with other components while meeting the connection strength requirements, thereby improving the forming quality and assembly stability of the overall component.

[0019] Preferably, in step S3, the progressive stretching is divided into 4-6 passes, with each pass stretching amount not exceeding 20%, and the final filament diameter is controlled at 1.5-2.0 mm.

[0020] By adopting the above technical solution, the progressive stretching is divided into 4-6 passes, and the stretching amount in each pass does not exceed 20%. This avoids defects such as breakage and wrinkling of the strip filaments caused by excessive stretching in a single pass, allowing the material to be subjected to more uniform stress during the stretching process and gradually achieve morphological transformation. By controlling the final strip filament diameter to 1.5-2.0 mm, the strip filaments can have sufficient strength to cope with the stress during the mixing operation, while maintaining appropriate flexibility, thereby ensuring the smooth progress of subsequent bending and forming and the stability of the cage structure.

[0021] Preferably, in step S4, the bending speed is controlled at 10-20° / s.

[0022] By adopting the above technical solution, the stretched filaments can be subjected to more uniform stress and deformation during bending, avoiding cracks caused by local stress concentration due to excessive speed, or production efficiency affected by excessively slow speed. This moderate bending speed allows the filaments to smoothly form an ellipsoidal cage, ensuring the shape accuracy of the cage and the positional coordination between the filaments, thus providing a structural foundation for the efficient operation of subsequent mixing.

[0023] Preferably, in step S5, the protective atmosphere is a nitrogen-hydrogen mixture with a hydrogen content of 3-5%, and the cooling rate is controlled at 50-80℃ / min.

[0024] By adopting the above technical solution, air can be isolated during deformation heat treatment to prevent oxidation of the component surface. At the same time, hydrogen can play a certain reducing role to remove any trace oxide film that may exist, creating a stable environment for adjusting the internal structure of the component. Controlling the cooling rate at 50-80℃ / min can quickly fix the microstructure after heat treatment, avoid excessive grain growth, maintain the mechanical properties of the component, and thus improve the strength and toughness of the component, making it more adaptable to the complex stress conditions in stirring operations.

[0025] Preferably, in step S6, the micro-arc oxidation treatment uses a bipolar pulse power supply with a positive-to-negative pulse frequency ratio of 1:2-1:3 and a duty cycle of 25-35%.

[0026] By adopting the above technical solution, using a bipolar pulse power supply for micro-arc oxidation treatment, and setting the positive and negative pulse frequency ratio to 1:2-1:3 and the duty cycle to 25-35%, the distribution of electrical energy on the component surface can be more uniform, promoting the stable growth of the oxide layer and avoiding local over-oxidation or under-oxidation. This power supply parameter setting can make the oxide layer more dense, more uniform in thickness, and more firmly bonded to the substrate, providing a good surface substrate for subsequent ion implantation treatment, thereby enhancing the overall performance of the component surface.

[0027] Preferably, in step S7, the cryogenic treatment adopts a segmented cooling method, first cooling to -40°C at a rate of 3-5°C / min, holding at that temperature for 0.5-1.0h, and then continuing to cool to the target temperature at a rate of 8-10°C / min.

[0028] By adopting the above technical solution and using a segmented cooling method for cryogenic treatment, the temperature is first lowered to -40℃ at a rate of 3-5℃ / min and held for 0.5-1.0h, which allows the internal temperature of the component to gradually become uniform and reduces the internal stress caused by rapid cooling. Then, the temperature is lowered to the target temperature at a rate of 8-10℃ / min, which can efficiently achieve the low temperature conditions required for cryogenic treatment without stress concentration. This segmented cooling method can more effectively stabilize the internal structure of the component, reduce dimensional fluctuations during subsequent use, and thus improve the dimensional stability of the component under temperature change environments.

[0029] Preferably, in step S8, the electroless nickel plating process uses an aminosulfonate system plating solution with a nickel ion concentration of 6-8 g / L, a sodium hypophosphite concentration of 25-30 g / L, and 1.0-2.0 g / L of sodium succinate added as a stabilizer.

[0030] By adopting the above technical solution, chemical nickel plating is performed using an aminosulfonate system plating solution. Controlling the nickel ion concentration to 6-8 g / L and the sodium hypophosphite concentration to 25-30 g / L provides a suitable ionic environment for coating formation, ensuring the deposition rate and compositional uniformity of the coating. Adding 1.0-2.0 g / L of sodium succinate as a stabilizer prevents premature precipitation of nickel ions in the plating solution, avoiding defects such as pinholes and nodular protrusions in the coating. This allows the coating to adhere more densely to the component surface, thereby enhancing the coating's protective effect on the component and improving its wear resistance and corrosion resistance.

[0031] Preferably, in step S8, the electroless nickel plating treatment is performed at a temperature of 85-90°C, a deposition rate of 15-20 μm / h, a pH value controlled at 4.5-5.0, and a plating solution stirring speed of 100-150 rpm.

[0032] By adopting the above technical solutions, controlling the electroless nickel plating temperature at 85-90℃ provides suitable temperature conditions for the chemical reaction in the plating solution, promoting the reduction and deposition of nickel ions and ensuring the efficiency and quality of the coating formation. Setting the deposition rate to 15-20μm / h allows for uniform coating growth and avoids loose coating due to excessively rapid deposition. Controlling the pH value at 4.5-5.0 maintains the stability of the plating solution, ensuring normal nickel ion deposition and reducing impurity precipitation. Stirring the plating solution at 100-150rpm ensures a more uniform distribution of components, resulting in a coating of consistent thickness across all parts of the component, thereby improving the protective effect of the coating and the overall performance of the component.

[0033] In summary, this application has the following beneficial effects:

[0034] 1. Because this application adopts the method of electrolytic polishing of strip pretreatment without intermediate cleaning and directly performing low-temperature plasma nitriding treatment, the residual electrolyte is used to help form a uniform nitriding layer; because the component shape is precisely controlled by subsequent steps such as composite stamping, multi-directional stretching, and three-dimensional bending, combined with the synergistic effect of deformation heat treatment and surface composite treatment, the effect of stable mechanical properties is obtained.

[0035] 2. In this application, an aminosulfonate system plating solution is preferably used for electroless nickel plating, and a specific amount of sodium succinate is added as a stabilizer. Because the combination of this plating solution system and the stabilizer can stabilize the plating solution composition, promote uniform and dense deposition of the coating, and enhance the adhesion between the coating and the substrate, the surface protection performance of the component is better, and the wear resistance and corrosion resistance are significantly improved.

[0036] 3. The method of this application adopts a segmented cooling method through cryogenic treatment. First, the temperature is slowly lowered to -40℃ and held, and then the temperature is further lowered to the target temperature. After micro-arc oxidation treatment, ion implantation is performed directly without intermediate treatment, which makes it easier for ions to penetrate into the oxide layer and the matrix. Therefore, the internal stress of the component is effectively released, the dimensional stability is good, the surface modification effect is enhanced, and the overall performance is better. Attached Figure Description

[0037] Figure 1 This is a flowchart of a manufacturing process for a stacked composite high-efficiency mixing component provided in this application;

[0038] Figure 2 This is a schematic diagram of a layered composite high-efficiency mixing component provided in this application. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings, embodiments and comparative examples.

[0040] Among them, the appendix Figure 2 This is merely an illustrative illustration and is not limited to this shape.

[0041] Technical concept:

[0042] In related technologies, the manufacturing process of stacked mixing components often suffers from problems such as poor surface quality, insufficient structural precision, and unstable mechanical properties. This is mainly because during strip pretreatment, electrolytic polishing followed by intermediate cleaning removes residual components that are beneficial to nitriding, resulting in uneven formation of the nitrided layer. At the same time, the parameter control of forming steps such as composite stamping, stretching, and bending lacks precision, and the coordination between subsequent processes such as deformation heat treatment and surface treatment and the previous forming process is insufficient, making it difficult for the effects of each link to be effectively superimposed. Instead, improper connection may lead to performance defects.

[0043] This technical solution addresses the aforementioned issues by optimizing process integration and parameter coordination: during strip pretreatment, no intermediate cleaning is performed after electrolytic polishing; the residual electrolyte is used to assist in low-temperature plasma nitriding to form a uniform nitrided layer; key parameters such as punching gap, stretching ratio, and bending speed are precisely controlled in forming steps such as composite stamping, multi-directional stretching, and three-dimensional bending; and deformation heat treatment, surface composite treatment, cryogenic treatment, and electroless nickel plating are closely integrated with the forming process, thereby improving the surface quality, structural accuracy, and mechanical property stability of the components through the synergistic effect of each step.

[0044] This application provides a manufacturing process for a layered composite high-efficiency mixing component. The manufacturing process for this layered composite high-efficiency mixing component, as described in the embodiments of this application, is explained in detail below.

[0045] Example 1

[0046] This application provides a manufacturing process for a layered composite high-efficiency mixing component, including the following steps:

[0047] S1. Strip pretreatment: Duplex stainless steel strip with a thickness of 1.0 mm is selected. It is first subjected to electrolytic polishing with a current density of 20 A / dm2. The electrolyte used for electrolytic polishing is a mixed solution of phosphoric acid, sulfuric acid and glycerol with a volume ratio of 3.5:1:0.6. After electrolytic polishing, it is directly subjected to low-temperature plasma nitriding without intermediate cleaning. The treatment temperature is 475℃ and the treatment time is 4 hours.

[0048] S2. Composite stamping forming: Using a multi-station progressive die, one end of the nitrided strip is punched into 13 strips, each 2.0mm wide. A connecting part is punched at the other end of the strip, which is 2.5mm narrower than the original strip, resulting in a connecting part width of 13.5mm. Two notches are symmetrically punched at the edge of the connecting part, each 3.0mm wide and 5.0mm deep. A multi-station progressive die is used, with a punching gap of 7% of the material thickness and a punching speed of 250 times / minute.

[0049] S3, Multi-directional stretching forming: The stamped components are progressively stretched through multiple sets of roller dies with a stretching ratio of 1.75. Atomized cooling and lubrication are used during the stretching process. The progressive stretching is divided into 5 passes, with each pass stretching amount not exceeding 20%, and the final strip wire diameter is controlled at 1.75mm.

[0050] S4. Three-dimensional bending forming: The stretched strip wire is bent to form an ellipsoidal cage with a major axis diameter of 100mm and a minor axis diameter of 80mm; the bending speed is controlled at 15° / s.

[0051] S5. Deformation heat treatment: The bent component is subjected to deformation heat treatment at 575℃ under a protective atmosphere for 60 minutes, and then cooled to room temperature at a rate of 65℃ / min; the protective atmosphere is a nitrogen-hydrogen mixture with a hydrogen content of 4%.

[0052] S6. Surface composite treatment: First, the heat-treated components are subjected to micro-arc oxidation treatment at a voltage of 350V for 20 minutes. The micro-arc oxidation treatment uses a bipolar pulse power supply with a positive to negative pulse frequency ratio of 1:2.5 and a duty cycle of 30%. After the micro-arc oxidation treatment, ion implantation treatment is carried out directly without intermediate treatment. The implanted nitrogen ion energy is 80keV.

[0053] S7. Dimensional stability treatment: The surface-treated components are subjected to deep cryogenic treatment at -90℃ for 3 hours, and then heated to room temperature at a rate of 2.5℃ / min. The deep cryogenic treatment adopts a segmented cooling method, first cooling to -40℃ at a rate of 4℃ / min and holding for 0.75 hours, and then continuing to cool to the target temperature at a rate of 9℃ / min.

[0054] S8. Final Surface Treatment: The components after cryogenic treatment are subjected to electroless nickel plating with a coating thickness of 10 μm, followed by low-temperature curing at 190℃ for 1.5 h. The electroless nickel plating uses an aminosulfonate system plating solution with a nickel ion concentration of 7 g / L, a sodium hypophosphite concentration of 27.5 g / L, and 1.5 g / L sodium succinate added as a stabilizer. The electroless nickel plating temperature is 87.5℃, the deposition rate is 17.5 μm / h, the pH value is controlled at 4.8, and the plating solution stirring speed is 125 rpm.

[0055] Example 2

[0056] This application provides a manufacturing process for a layered composite high-efficiency mixing component, including the following steps:

[0057] S1. Strip pretreatment: Duplex stainless steel strip with a thickness of 0.8mm is selected. It is first subjected to electrolytic polishing with a current density of 15A / dm2. The electrolyte used for electrolytic polishing is a mixed solution of phosphoric acid, sulfuric acid and glycerol with a volume ratio of 3:1:0.5. After electrolytic polishing, it is directly subjected to low-temperature plasma nitriding without intermediate cleaning. The treatment temperature is 450℃ and the treatment time is 3h.

[0058] S2. Composite stamping forming: Using a multi-station progressive die, one end of the nitrided strip is punched into 12 strips, each 1.8mm wide. A connecting part is punched at the other end of the strip, which is 2.0mm narrower than the original strip, resulting in a 12mm width. Two notches are symmetrically punched at the edge of the connecting part, each 2.8mm wide and 4.5mm deep. A multi-station progressive die is used, with a punching gap of 6% of the material thickness and a punching speed of 200 times / minute.

[0059] S3, Multi-directional stretching forming: The stamped components are progressively stretched through multiple sets of roller dies with a stretching ratio of 1.5. Atomized cooling and lubrication are used during the stretching process. The progressive stretching is divided into 4 passes, with each pass stretching amount not exceeding 20%, and the final strip wire diameter is controlled at 1.5mm.

[0060] S4. Three-dimensional bending forming: The stretched strip wire is bent to form an ellipsoidal cage with a major axis diameter of 90mm and a minor axis diameter of 70mm; the bending speed is controlled at 10° / s.

[0061] S5. Deformation heat treatment: The bent component is subjected to deformation heat treatment at 550℃ under a protective atmosphere for 40 minutes, and then cooled to room temperature at a rate of 50℃ / min; the protective atmosphere is a nitrogen-hydrogen mixture with a hydrogen content of 3%.

[0062] S6. Surface composite treatment: First, the heat-treated components are subjected to micro-arc oxidation treatment at a voltage of 300V for 15 minutes. The micro-arc oxidation treatment uses a bipolar pulse power supply with a positive-to-negative pulse frequency ratio of 1:2 and a duty cycle of 25%. After the micro-arc oxidation treatment, ion implantation treatment is carried out directly without intermediate treatment, and the implanted nitrogen ion energy is 70keV.

[0063] S7. Dimensional stability treatment: The surface-treated components are subjected to deep cryogenic treatment at -100℃ for 2 hours, and then restored to room temperature at a rate of 2℃ / min. The deep cryogenic treatment adopts a segmented cooling method, first cooling to -40℃ at a rate of 3℃ / min and holding for 0.5 hours, and then continuing to cool to the target temperature at a rate of 8℃ / min.

[0064] S8. Final Surface Treatment: The components after cryogenic treatment are subjected to electroless nickel plating with a coating thickness of 8μm, followed by low-temperature curing at 180℃ for 1 hour. The electroless nickel plating uses an aminosulfonate system plating solution with a nickel ion concentration of 6g / L, a sodium hypophosphite concentration of 25g / L, and 1.0g / L sodium succinate as a stabilizer. The electroless nickel plating temperature is 85℃, the deposition rate is 15μm / h, the pH value is controlled at 4.5, and the plating solution stirring speed is 100rpm.

[0065] Example 3

[0066] This application provides a manufacturing process for a layered composite high-efficiency mixing component, including the following steps:

[0067] S1. Strip pretreatment: Duplex stainless steel strip with a thickness of 1.2mm is selected. It is first subjected to electrolytic polishing with a current density of 25A / dm2. The electrolyte used for electrolytic polishing is a mixed solution of phosphoric acid, sulfuric acid and glycerol with a volume ratio of 4:1:0.8. After electrolytic polishing, it is directly subjected to low-temperature plasma nitriding without intermediate cleaning. The treatment temperature is 500℃ and the treatment time is 5h.

[0068] S2. Composite stamping forming: Using a multi-station progressive die, one end of the nitrided strip is punched into 14 strips, each 2.2mm wide. A connecting part is punched at the other end of the strip, which is 3.0mm narrower than the original strip, resulting in a 15mm width. Two notches are symmetrically punched at the edge of the connecting part, each 3.2mm wide and 5.5mm deep. A multi-station progressive die is used, with a punching gap of 8% of the material thickness and a punching speed of 300 times / minute.

[0069] S3. Multi-directional stretching forming: The stamped components are progressively stretched through multiple sets of roller dies with a stretching ratio of 2.0. Atomized cooling and lubrication are used during the stretching process. The progressive stretching is divided into 6 passes, with each pass stretching amount not exceeding 20%, and the final strip wire diameter is controlled at 2.0 mm.

[0070] S4. Three-dimensional bending forming: The stretched strip wire is bent to form an ellipsoidal cage with a major axis diameter of 110mm and a minor axis diameter of 90mm; the bending speed is controlled at 20° / s.

[0071] S5. Deformation heat treatment: The bent component is subjected to deformation heat treatment at 600℃ under a protective atmosphere for 80 min, and then cooled to room temperature at a rate of 80℃ / min; the protective atmosphere is a nitrogen-hydrogen mixture with a hydrogen content of 5%.

[0072] S6. Surface composite treatment: First, the heat-treated components are subjected to micro-arc oxidation treatment at a voltage of 400V for 25 minutes. The micro-arc oxidation treatment uses a bipolar pulse power supply with a positive-to-negative pulse frequency ratio of 1:3 and a duty cycle of 35%. After the micro-arc oxidation treatment, ion implantation treatment is carried out directly without intermediate treatment, and the implanted nitrogen ion energy is 90keV.

[0073] S7. Dimensional stability treatment: The surface-treated components are subjected to deep cryogenic treatment at -80℃ for 4 hours, and then heated to room temperature at a rate of 3℃ / min. The deep cryogenic treatment adopts a segmented cooling method, first cooling to -40℃ at a rate of 5℃ / min and holding for 1 hour, and then continuing to cool to the target temperature at a rate of 10℃ / min.

[0074] S8. Final Surface Treatment: The components after cryogenic treatment are subjected to electroless nickel plating with a coating thickness of 12μm, followed by low-temperature curing at 200℃ for 2 hours. The electroless nickel plating uses an aminosulfonate system plating solution with a nickel ion concentration of 8g / L, a sodium hypophosphite concentration of 30g / L, and 2.0g / L sodium succinate as a stabilizer. The electroless nickel plating temperature is 90℃, the deposition rate is 20μm / h, the pH value is controlled at 5.0, and the plating solution stirring speed is 150rpm.

[0075] Comparative Example 1

[0076] The only difference from Example 1 is that in step S8, sodium succinate was not added to the plating solution as a stabilizer during the electroless nickel plating process. Apart from the above differences, all other steps and parameters are the same as in Example 1.

[0077] Comparative Example 2

[0078] The only difference from Example 1 is that in step S8, thiourea is used instead of sodium succinate as a stabilizer during the electroless nickel plating process. Apart from the above differences, all other steps and parameters are the same as in Example 1.

[0079] Comparative Example 3

[0080] The only difference from Example 1 is that in step S1, after electrolytic polishing, the product is first washed and dried, and then subjected to low-temperature plasma nitriding. Apart from the above differences, all other steps and parameters are the same as in Example 1.

[0081] Comparative Example 4

[0082] The only difference from Example 1 is that in step S6, after the micro-arc oxidation treatment, the component is washed and dried, and then ion implantation is performed. All other steps and parameters are the same as in Example 1.

[0083] Comparative Example 5

[0084] The only difference from Example 1 is that in step S7, during the segmented cooling of the cryogenic treatment, no heat preservation is performed at -40℃, and the temperature is directly continued to drop to the target temperature at a rate of 9℃ / min. Apart from the above differences, all other steps and parameters are the same as in Example 1.

[0085] 1. Agitation Wear Performance Test: A stirred tank wear test apparatus was used. The agitators of the examples and comparative examples were installed on a stirring shaft with a rotation speed of 300 r / min. They were continuously stirred for 200 h in a tank containing 5 kg of 0.5-1 mm quartz sand and 10 L of tap water. The medium temperature was maintained at 25 ± 2 ℃ during the experiment. After the experiment, the mass of the components before and after wear was weighed using an electronic balance with an accuracy of 0.001 g, and the mass wear amount was calculated. At the same time, the Ra value of the wear area on the surface of the components was measured using a surface roughness meter, and the morphology of the wear surface was observed using an optical microscope. This was used to evaluate the differences in wear resistance of agitators prepared by different processes.

[0086] 2. Corrosion resistance test: A neutral salt spray test was adopted. Each sample was placed in a salt spray chamber with a salt spray concentration of 5% sodium chloride solution, a pH value of 6.5-7.2, and a chamber temperature of 35℃. The spraying was carried out continuously for 1000 hours. During the experiment, the corrosion of the component surface was observed every 200 hours. After the experiment, the sample was taken out, the surface corrosion products were removed, and the percentage of the corroded area to the total surface area was measured. At the same time, a microhardness tester was used to measure the hardness change of the corroded area to evaluate the corrosion resistance of the component.

[0087] 3. Dimensional stability test: Using a coordinate measuring machine with an accuracy of 0.001 mm, the major axis diameter, minor axis diameter, and connection width of the ellipsoidal cage of the embodiment and comparative examples were measured before the experiment. The components were then placed in a low temperature environment of -50±2℃ for 4 hours, and then transferred to a high temperature environment of 80±2℃ for 4 hours. This thermal shock test was repeated 50 times. After the test, the above dimensional parameters were measured again, and the rate of change of each dimension was calculated to evaluate the dimensional stability of the components under temperature change conditions.

[0088] The results of the key performance tests of Examples 1-3 and Comparative Examples 1-5 are shown in Table 1.

[0089] Table 1:

[0090]

[0091] 1. The test standard for mass wear is: GB / T12444 "Metallic Materials Wear Test Methods - Rotational Wear Test";

[0092] 2. The test standard for surface roughness Ra is: GB / T3505 "Geometric Specifications for Products (GPS) - Terminology, Definitions and Surface Structure Parameters for Surface Structure Profile Method";

[0093] 3. The test standard for the corrosion area ratio is: GB / T10125 "Artificial Atmosphere Corrosion Test - Salt Spray Test";

[0094] 4. The test standard for the hardness reduction range is: GB / T230.1 "Metallic materials Rockwell hardness test - Part 1: Test method";

[0095] 5. The test standard for dimensional change rate is: GB / T41739-2022 "Metal Matrix Composites Dimensional Stability Test Method: Thermal Cycling Method".

[0096] As can be seen from Examples 1-3 and Comparative Example 1, and Table 1, whether or not sodium succinate is added as a stabilizer during electroless nickel plating has a significant impact on product performance. Example 1, which added 1.5 g / L of sodium succinate, showed better results in terms of mass wear, surface roughness, corrosion area ratio, and hardness reduction compared to Comparative Example 1, which did not add sodium succinate. This is because sodium succinate can stabilize the plating solution, promote the uniform and dense formation of the coating, and enhance the adhesion between the coating and the substrate, thereby improving the wear resistance and corrosion resistance of the component.

[0097] Combining Examples 1-3 and Comparative Example 2 with Table 1, it can be seen that the type of stabilizer used in electroless nickel plating affects product performance. Example 1 uses sodium succinate as a stabilizer, which performs better than Comparative Example 2 using thiourea as a stabilizer in terms of mass wear, surface roughness, corrosion area ratio, and hardness reduction. Different stabilizers have different effects on the stabilization effect of the plating solution and the performance of the coating. Sodium succinate is more suitable for electroless nickel plating under this process and can better synergistically improve the performance of the components.

[0098] Combining Examples 1-3 and Comparative Example 3 with Table 1, it can be seen that whether or not intermediate cleaning is performed after electropolishing has a significant impact on product performance. Example 1 underwent low-temperature plasma nitriding directly after electropolishing without intermediate cleaning, while Comparative Example 3 underwent water washing and drying after electropolishing. The former's performance indicators were superior to the latter's. This may be because the residual electrolyte components after electropolishing can play a certain auxiliary role in nitriding, promoting the formation of the nitrided layer and enhancing the surface properties of the component. The intermediate cleaning step removes these beneficial components, affecting the nitriding effect. Combining Examples 1-3 and Comparative Example 4 with Table 1, it can be seen that whether or not intermediate treatment is performed after micro-arc oxidation affects product performance. In Example 1, the micro-arc oxidation treatment was followed by ion implantation without intermediate treatment, while in Comparative Example 4, the micro-arc oxidation was followed by water washing and drying. Example 1 showed better performance. After micro-arc oxidation, a specific oxide layer is formed on the surface. Direct ion implantation may make it easier for ions to penetrate into the oxide layer and the matrix, enhancing the surface modification effect. However, water washing and drying may destroy the continuity of the oxide layer or affect the efficiency of ion implantation, thereby reducing the performance of the component.

[0099] Combining Examples 1-3 and Comparative Example 5 with Table 1, it can be seen that whether or not the cryogenic treatment involves holding at -40℃ during the segmented cooling process significantly affects the dimensional stability of the product. In Example 1, the cryogenic treatment involved holding at -40℃ for 0.75 hours during the segmented cooling process, while Comparative Example 5 directly cooled to the target temperature without holding. The dimensional change rate of Example 1 was much smaller than that of Comparative Example 5. Holding at -40℃ allows for a more uniform internal temperature of the component, reduces thermal stress, and avoids excessive dimensional changes due to stress concentration during subsequent cooling, thus improving the dimensional stability of the component. Without holding, this stress cannot be effectively released, leading to a decrease in dimensional stability.

[0100] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A manufacturing process for a layered composite high-efficiency mixing component, characterized in that: Includes the following steps: S1. Strip pretreatment: Select duplex stainless steel strip with a thickness of 0.8-1.2mm. First, perform electrolytic polishing treatment with a current density of 15-25A / dm2. After electrolytic polishing treatment, directly perform low-temperature plasma nitriding treatment without intermediate cleaning. The treatment temperature is 450-500℃ and the treatment time is 3-5h. S2. Composite stamping forming: Using a multi-station progressive die, one end of the nitrided strip is punched into 12 to 14 strips with a width of 1.8-2.2 mm; a connecting part is punched out at the other end of the strip, which is 2.0-3.0 mm narrower than the original strip, and two notches are symmetrically punched out at the edge of the connecting part, with a width of 2.8-3.2 mm and a depth of 4.5-5.5 mm. S3, Multi-directional stretching forming: The stamped components are progressively stretched through multiple sets of roller dies, with a stretching ratio of 1.5 to 2.

0. Atomized cooling and lubrication are used during the stretching process. S4. Three-dimensional bending forming: The stretched strip wire is bent to form an ellipsoidal cage with a major axis diameter of 90-110mm and a minor axis diameter of 70-90mm. S5. Deformation heat treatment: The bent components are subjected to deformation heat treatment at 550-600℃ under a protective atmosphere for 40-80 minutes, and then cooled to room temperature at a rate of 50-80℃ / min. S6. Surface composite treatment: First, perform micro-arc oxidation treatment on the heat-treated components. The voltage is 300-400V and the treatment time is 15-25min. After micro-arc oxidation treatment, ion implantation treatment is performed directly without intermediate treatment. The implanted nitrogen ion energy is 70-90keV. S7. Dimensional stability treatment: After surface treatment, the components are subjected to deep cryogenic treatment at -80℃ to -100℃ for 2-4 hours, and then warmed to room temperature at a rate of 2-3℃ / min. S8. Final surface treatment: The components after cryogenic treatment are chemically plated with nickel with a coating thickness of 8-12μm, and then cured at a low temperature of 180-200℃ for 1-2 hours.

2. The manufacturing process for a layered composite high-efficiency stirring component according to claim 1, characterized in that: In step S1, the electrolyte used for electropolishing is a mixed solution of phosphoric acid, sulfuric acid and glycerol, with a volume ratio of 3:1:0.5 to 4:1:0.

8.

3. The manufacturing process for a layered composite high-efficiency stirring component according to claim 1, characterized in that: In step S2, the punching gap of the multi-station progressive die is 6-8% of the material thickness, the punching speed is 200-300 times / minute, and the width of the narrowed connecting part is 12-15mm.

4. The manufacturing process for a layered composite high-efficiency stirring component according to claim 1, characterized in that: In step S3, the progressive stretching is divided into 4-6 passes, with each pass stretching amount not exceeding 20%, and the final filament diameter is controlled at 1.5-2.0 mm.

5. The manufacturing process for a layered composite high-efficiency mixing component according to claim 1, characterized in that: In step S4, the bending speed is controlled at 10-20° / s.

6. The manufacturing process for a layered composite high-efficiency stirring component according to claim 1, characterized in that: In step S5, the protective atmosphere is a nitrogen-hydrogen mixture with a hydrogen content of 3-5%, and the cooling rate is controlled at 50-80℃ / min.

7. The manufacturing process for a layered composite high-efficiency stirring component according to claim 1, characterized in that: In step S6, the micro-arc oxidation process uses a bipolar pulse power supply with a positive-to-negative pulse frequency ratio of 1:2-1:3 and a duty cycle of 25-35%.

8. The manufacturing process for a layered composite high-efficiency stirring component according to claim 1, characterized in that: In step S7, the cryogenic treatment adopts a segmented cooling method. First, the temperature is lowered to -40°C at a rate of 3-5°C / min and held for 0.5-1.0h. Then, the temperature is further lowered to the target temperature at a rate of 8-10°C / min.

9. The manufacturing process for a layered composite high-efficiency stirring component according to claim 1, characterized in that: In step S8, the electroless nickel plating process uses an aminosulfonate system plating solution with a nickel ion concentration of 6-8 g / L, a sodium hypophosphite concentration of 25-30 g / L, and 1.0-2.0 g / L of sodium succinate added as a stabilizer.

10. The manufacturing process for a layered composite high-efficiency stirring component according to claim 1, characterized in that: In step S8, the electroless nickel plating treatment is performed at a temperature of 85-90℃, a deposition rate of 15-20μm / h, a pH value of 4.5-5.0, and a stirring speed of 100-150rpm.

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