Supersonic electric arc spraying device and spraying process

Abstract

The invention relates to the technical field of electric arc spraying devices, in particular to a supersonic speed electric arc spraying device and a spraying technology.The supersonic speed electric arc spraying device comprises a supersonic speed electric arc spraying device body, the outer wall of one end of the supersonic speed electric arc spraying device body is fixedly connected with a power source, and the other end of the supersonic speed electric arc spraying device body is fixedly connected with a spraying opening; a first wire pipe is fixedly connected to the side, close to the spraying opening, of the outer wall of one side of the supersonic electric arc spraying device body. The wire feeding wheel has the beneficial effects that through the elastic pieces and the elastic rings installed in the wire feeding wheel, when the wire feeding wheel conveys metal wires, impact force and vibration generated in the conveying process of the metal wires are effectively absorbed and collected, so that the metal wires are more stable in the conveying process, the risk that the metal wires deviate or break due to vibration or impact is reduced, and the production efficiency is improved. The stability and the reliability of conveying are correspondingly improved, and the smooth proceeding of the production process is ensured.

Description

Technical Field

[0001] The invention relates to the field of arc spraying devices, in particular to a supersonic arc spraying device and a spraying process. Background Art

[0002] Thermal spraying refers to heating and melting the coating material, atomizing it into extremely fine particles with a high-speed airflow, and spraying it onto the surface of the workpiece at a very high speed to form a coating. By selecting different coating materials according to needs, one or more properties such as wear resistance, corrosion resistance, oxidation resistance, and heat resistance can be obtained. Supersonic arc spraying is the most commonly used method in thermal spraying.

[0003] In the prior art, the supersonic arc spraying device is a highly efficient thermal spraying equipment, which is mainly composed of a special power supply for spraying, a control device, an arc spray gun, a wire feeder and a compressed air supply system. Its working principle is to use the arc between two continuously fed conductive metal wires to melt the metal, and then use a high-speed airflow to atomize the molten metal, and accelerate the atomized metal particles through a Rafale nozzle, so that they are sprayed onto the surface of the workpiece at a high speed exceeding the speed of sound, thereby forming a high-quality coating.

[0004] However, the instability of the wire feeding wheel during operation will cause uneven feeding speed of the metal wire, which in turn makes the spraying speed of the metal droplets inconsistent during the arc spraying process, resulting in uneven distribution of the coating on the substrate surface, with varying thicknesses, affecting the overall quality of the coating. Summary of the invention

[0005] The object of the present invention is to provide a supersonic arc spraying device and a spraying process to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: the supersonic arc spraying comprises: a supersonic arc spraying device body, an outer wall at one end of the supersonic arc spraying device body is fixedly connected to a power supply, the other end of the supersonic arc spraying device body is fixedly connected to a spraying port, a wire tube 1 is fixedly connected to the outer wall of one side of the supersonic arc spraying device body near the spraying port, a wire tube 2 is fixedly connected to the outer wall of one side of the supersonic arc spraying device body near the power supply, a mounting seat 1 is fixedly connected to the outer walls on both sides of the supersonic arc spraying device body, a wire feeding wheel is rotatably connected to the outer walls on the opposite sides of the two mounting seats, a mounting seat 2 is fixedly connected to the outer wall of one side of the supersonic arc spraying device body near the top of the mounting seat 1, and a fixing sleeve is fixedly connected to the outer wall of one side of the mounting seat 2.

[0007] Preferably, a raised plate is fixedly connected to the interior of the fixed sleeve, a protective shell is slidably connected to the interior of the fixed sleeve, the interior of the protective shell is slidably connected to the outer wall of the raised plate, a return spring is fixedly connected to the outer wall of one side of the raised plate, and the outer walls of one end of the two return springs are fixedly connected to one side of the interior of the protective shell.

[0008] Preferably, a cavity is provided inside the two wire feeding wheels, elastic rings are fixedly connected to both sides of the cavity, the inner ring wall of the elastic ring is movably in contact with the outer shell, a groove is provided on the outer wall of the wire feeding wheel, a gear is fixedly connected to the outer wall of the wire feeding wheel close to the outer side of the groove, and a plurality of elastic protrusions are fixedly connected to the inside of the groove.

[0009] Preferably, grooves are provided on both sides of the cavity, elastic sheets are movably inserted in the grooves, and rubber strips are fixedly connected to both ends of one side of the elastic sheet.

[0010] Preferably, a limiting groove is provided on the outer wall on one side of the wire feeding wheel, the inner wall height of the outer shell side is connected to the limiting block, the outer wall of the limiting block is movably plugged into the inside of the limiting groove, the outer wall on one side of the wire feeding wheel is fixedly connected with an installation groove, and a plurality of limiting rods are movably plugged into the inside of the installation grooves.

[0011] Preferably, a fixing hole is opened on the outer wall of one side of the plurality of limit rods, a fixing rod is movably inserted inside the fixing hole, a rubber ring is provided on the outer wall of the fixing rod, the outer wall of one end of the plurality of fixing rods is fixedly connected to the same elastic fixing ring, a fixing spring is fixedly connected to the outer wall of one side of the mounting groove, and the outer wall of one end of the fixing spring is fixedly connected to the outer wall of one side of the elastic fixing ring.

[0012] Preferably, a plurality of fixing grooves are fixedly connected to the outer wall of the shell, and the interior of the fixing grooves is slidably connected to the outer wall of the limiting rod.

[0013] A supersonic arc spraying process is implemented based on a supersonic arc spraying device. The supersonic arc spraying process includes the following steps:

[0014] S1: Rust removal: the surface cleanliness of the workpiece should reach Sa3 level specified in GB / T 8923, that is, the surface should be free of visible oil, grease and dirt, and should be free of oxide scale, rust, coating and foreign impurities, and should have a uniform metallic color;

[0015] S2: Supersonic arc spraying,

[0016] 1) Compressed air pressure: 0.5-0.8 MPa, so that the coating particles obtain a higher energy velocity, resulting in an increase in the coating particle density, a reduction in pores, an increase in the coating adhesion, and an improvement in the corrosion protection effect;

[0017] 2) Spraying distance: The vertical distance from the spray gun nozzle to the workpiece surface is controlled at 80-150 mm;

[0018] 3) Working current: 130A ~ 210A, input voltage: 380V / 50Hz, no-load voltage: 25V ~ 30V;

[0019] 4) Spraying angle: the spray gun is perpendicular to the working surface;

[0020] 5) Spray wire feeding speed: refer to the equipment manual;

[0021] 6) Spray gun moving speed: preferably 200-400 mm / s, and the moving speed should be uniform;

[0022] 7) Spraying temperature: The surface temperature of the workpiece during spraying is less than 200°C;

[0023] 8) Spraying environment: air temperature > 5°C, relative humidity ≤ 80%, metal surface temperature is 3°C higher than the air dew point temperature, wind force ≤ level 5, and no dust in the air;

[0024] S3: Surface cleaning: Use clean air to blow away or vacuum the dust on the surface of the metal coating before sealing. The time interval should not be too long to prevent oxidation of the metal coating.

[0025] S4: Apply sealing paint. Before sealing the holes, check whether the thickness of the metal coating meets the design requirements and whether there are any obvious defects on the surface;

[0026] S5: Finished product inspection: the appearance should be uniform, without peeling, cracking, splashing, raw silk adhesion and other defects.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention proposes a supersonic arc spraying device and a spraying process. Through the spring pieces and the elastic ring installed inside the wire feeding wheel, when the wire feeding wheel transmits the metal wire, the impact force and vibration generated by the metal wire during the transmission process are effectively absorbed, thereby achieving a smoother transmission of the metal wire, reducing the risk of metal wire deviation or breakage caused by vibration or impact, and correspondingly improving the stability and reliability of the transmission, ensuring the smooth progress of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the main structure of the supersonic arc spraying device of the present invention;

[0031] Figure 3 For the present invention Figure 2 A is an enlarged schematic diagram of the structure at location A;

[0032] Figure 4 This is a schematic diagram of the mounting seat structure of the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the wire wheel of the present invention;

[0034] Figure 6 It is a schematic diagram of the internal structure of the wire wheel of the present invention;

[0035] Figure 7 It is a schematic diagram of the spring structure of the present invention;

[0036] Figure 8 This is a schematic diagram of the gear structure of the present invention;

[0037] Fig. 9 This is a schematic diagram of the housing structure of the present invention;

[0038] Fig.10 For the present invention Figure 8 The enlarged structural diagram at location B;

[0039] Fig.11 For the present invention Figure 8 The enlarged structural diagram at C;

[0040] Fig.12 It is a schematic diagram of the structure of the elastic fixing ring of the present invention;

[0041] Fig.13 It is a process flow chart of the present invention.

[0042] In the figure: 1. supersonic arc spraying device body; 11. power supply; 12. spraying port; 13. wire tube 1; 14. wire tube 2; 2. fixing sleeve; 21. protective shell; 22. return spring; 23. raised plate; 3. wire feeding wheel; 31. elastic ring; 32. shell; 33. gear;

[0043] 34. Mounting seat 1; 35. Elastic protrusion; 4. Elastic fixing ring; 41. Limiting groove; 42. Limiting block; 43. Fixing groove; 44. Mounting groove; 45. Limiting rod; 46. Fixing rod;

[0044] 47. Fixing hole; 48. Fixing spring; 5. Shrapnel; 51. Rubber strip. DETAILED DESCRIPTION

[0045] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] For example, see Figure 1-Figure 13 The present invention provides a supersonic arc spraying device and a spraying process technology solution: the supersonic arc spraying device comprises: a supersonic arc spraying device body 1, an outer wall at one end of the supersonic arc spraying device body 1 is fixedly connected to a power supply 11, and the other end of the supersonic arc spraying device body 1 is fixedly connected to a spraying port 12, and a wire tube 13 is fixedly connected to the outer wall of one side of the supersonic arc spraying device body 1 near the spraying port 12, and a wire tube 2 14 is fixedly connected to the outer wall of one side of the supersonic arc spraying device body 1 near the power supply 11, and the outer walls on both sides of the supersonic arc spraying device body 1 are fixedly connected to the outer wall of the supersonic arc spraying device body 1. A mounting seat 34 is connected, and the outer walls of the opposite sides of the two mounting seats 34 are rotatably connected to the wire feeding wheel 3, the outer wall of one side of the supersonic arc spraying device body 1 is fixedly connected to the mounting seat 2 near the top of the mounting seat 34, the outer wall of one side of the mounting seat 2 is fixedly connected to the fixing sleeve 2, the interior of the fixing sleeve 2 is fixedly connected to the raised plate 23, the interior of the fixing sleeve 2 is slidably connected to the protective shell 21, the interior of the protective shell 21 is slidably connected to the outer wall of the raised plate 23, the outer wall of one side of the raised plate 23 is fixedly connected to the reset spring 22, and the outer wall of one end of the two reset springs 22 is fixedly connected to one side of the interior of the protective shell 21.

[0047] The protective shell 21 is re-fixed on one side between the two wire feeding wheels 3 by the action of the reset spring 22, thereby shielding the metal wire and preventing the metal wire from breaking during operation and splashing everywhere to cause harm to personnel, thereby correspondingly reducing the risk of injury to operators and improving workplace safety.

[0048] Embodiment 2, on the basis of embodiment 1, a cavity is provided inside the two wire feeding wheels 3, elastic rings 31 are fixedly connected to both sides of the cavity, the inner ring wall of the elastic ring 31 is movably in contact with the outer shell 32, a groove is provided on the outer wall of the wire feeding wheel 3, a gear 33 is fixedly connected to the outer wall of the wire feeding wheel 3 close to the outer side of the groove, and a plurality of elastic protrusions 35 are fixedly connected inside the groove.

[0049] The elastic protrusion 35 provided inside the groove on the wire feeding wheel 3 increases the roughness of the wire feeding wheel 3, thereby increasing the friction between the wire feeding wheel 3 and the metal wire. The increase in friction enables the wire feeding wheel 3 to more effectively grasp and push the metal wire, reducing the sliding or stagnation of the metal wire during the transmission process, thereby significantly improving the transmission efficiency.

[0050] Embodiment 3, on the basis of embodiment 2, grooves are opened on both sides of the cavity, and elastic pieces 5 are movably inserted in the grooves, and rubber strips 51 are fixedly connected to both ends of one side of the elastic piece 5.

[0051] By means of the spring piece 5 and the elastic ring 31 installed inside the wire feeding wheel 3, when the wire feeding wheel 3 transmits the metal wire, the impact force and vibration generated by the metal wire during the transmission process are effectively absorbed, so that the metal wire can be transmitted more smoothly during the transmission process, and the risk of the metal wire being deflected or broken due to vibration or impact is reduced, thereby correspondingly improving the stability and reliability of the transmission and ensuring the smooth progress of the production process.

[0052] Embodiment 4, on the basis of embodiment 3, a limiting groove 41 is provided on the outer wall of one side of the wire feeding wheel 3, the inner wall height of one side of the shell 32 is connected to the limiting block 42, the outer wall of the limiting block 42 is movably plugged into the inside of the limiting groove 41, the outer wall of one side of the wire feeding wheel 3 is fixedly connected with a mounting groove 44, a plurality of mounting grooves 44 are internally movably plugged with limiting rods 45, a plurality of limiting rods 45 are provided with fixing holes 47 on the outer wall of one side, a fixing hole 47 is internally movably plugged with a fixing rod 46, a rubber ring is provided on the outer wall of the fixing rod 46, the outer wall of one end of the plurality of fixing rods 46 is fixedly connected with the same elastic fixing ring 4, the outer wall of one side of the mounting groove 44 is fixedly connected with a fixing spring 48, the outer wall of one end of the fixing spring 48 is fixedly connected to the outer wall of one side of the elastic fixing ring 4, the outer wall of the shell 32 is fixedly connected with a plurality of fixing grooves 43, the inside of the fixing groove 43 is slidably connected with the outer wall of the limiting rod 45.

[0053] After removing the shell 32, the operator can pinch the two ends of the spring piece 5 with his hands and apply force to bend the spring piece 5, thereby shortening the length of the spring piece 5, making it easier to remove the spring piece 5 from the inside of the wire feeding wheel 3, thereby completing the replacement of the spring piece 5. The simple replacement method reduces the additional costs incurred by the complicated disassembly and installation process. At the same time, since the equipment downtime is reduced, the economic losses caused by production interruptions are also reduced.

[0054] During actual use, first, the operator pulls the protective shell 21, and the protective shell 21 moves inside the fixed sleeve 2 to leave the position between the two wire feeding wheels 3. At this time, the metal wire is pulled out through the inside of the wire tube 14. After the metal wire passes through between the two wire feeding wheels 3 and enters the inside of the wire tube 13, the protective shell 21 is loosened, and the protective shell 21 can be driven to be re-fixed on one side between the two wire feeding wheels 3 under the action of the reset spring 22, thereby shielding the metal wire and avoiding the metal wire from breaking during work, causing the metal wire to splash everywhere and cause harm to personnel, thereby correspondingly reducing the risk of injury to operators and improving workplace safety.

[0055] When the metal wires are connected, the power supply 11 is started to supply power to the supersonic arc spraying device body 1 and the wire feeding wheel 3. Through the gear 33 provided on the wire feeding wheel 3, one wire feeding wheel 3 can be driven to rotate while the other wire feeding wheel 3 is rotated, so that the two metal wires on both sides of the supersonic arc spraying device body 1 are continuously and evenly fed into the two conductive nozzles in the arc spraying gun. The two conductive nozzles are respectively connected to the two poles of high current and low voltage, providing conditions for the generation of the arc, so that the coating is sprayed from the spray port 12.

[0056] By providing an elastic protrusion 35 inside the groove on the wire feeding wheel 3 to increase the roughness of the wire feeding wheel 3, the friction between the wire feeding wheel 3 and the metal wire is increased. The increase in friction enables the wire feeding wheel 3 to more effectively grasp and push the metal wire, reducing the sliding or stagnation of the metal wire during the transmission process, thereby significantly improving the transmission efficiency. Although the increase in friction will increase the contact pressure between the wire feeding wheel 3 and the metal wire, the presence of the elastic protrusion 35 can disperse this pressure and reduce the direct wear on the surface of the wire feeding wheel 3 and the metal wire. Long-term use can help to extend the service life of the wire feeding wheel 3 and the metal wire and reduce maintenance costs. The design of the elastic protrusion 35 not only increases the friction, but also can guide and correct the metal wire to a certain extent to prevent it from deflecting or twisting during the transmission process.

[0057] By means of the spring piece 5 and the elastic ring 31 installed inside the wire feeding wheel 3, when the wire feeding wheel 3 transmits the metal wire, the impact force and vibration generated by the metal wire during the transmission process are effectively absorbed, so that the metal wire can be transmitted more smoothly during the transmission process, and the risk of the metal wire being deflected or broken due to vibration or impact is reduced, and the stability and reliability of the transmission are correspondingly improved, ensuring the smooth progress of the production process. Then, by means of the rubber strips 51 connected at both ends of the spring piece 5, the supporting force of the spring piece 5 is increased when the spring piece 5 is working, so as to avoid wear or damage caused by long-term stress on the contact point between the spring piece 5 and the inside of the wire feeding wheel 3, and accordingly extend the service life of the spring piece 5, reduce the frequency of replacement and maintenance, and reduce the production cost.

[0058] Since multiple spring pieces 5 are independently installed inside the wire feeding wheel 3, when one of the spring pieces 5 is damaged, it is not necessary to replace the entire wire feeding wheel 3, but only the damaged part needs to be replaced, thereby reducing maintenance costs and time. The operator pulls the elastic fixing ring 4, and then through the movement of the elastic fixing ring 4, the fixing rod 46 is driven to move at the same time. The fixing rod 46 can be moved out from the inside of the fixing hole 47 through the movement, thereby releasing the fixing of the fixing rod 46 to the limiting rod 45, and the limiting rod 45 can be moved out from the inside of the mounting groove 44, so that the fixing of the limiting rod 45 to the housing 32 can be released. The outer shell 32 can be disassembled by simply rotating it, which improves the maintenance efficiency. The maintenance personnel can quickly locate and solve the problem, reducing the production interruption time. At this time, the outer shell 32 is rotated counterclockwise, and the movement of the outer shell 32 drives the limit block 42 to rotate inside the limit groove 41. When the limit block 42 is rotated to one side of the limit groove 41, the outer shell 32 is pulled outward to separate the outer shell 32 from the wire feeding wheel 3, which is convenient for replacing the internal structure of the wire feeding wheel 3. By rotating the outer shell 32 counterclockwise, the limit block 42 slides along the limit groove 41, ensuring the stability and accuracy of the disassembly process and preventing equipment damage or personal injury due to misoperation.

[0059] By providing a rubber ring on the outer wall of the fixing rod 46, when the fixing rod 46 is inserted into the fixing hole 47, the rubber ring can fill the gap between the fixing rod 46 and the fixing hole 47, thereby reducing the shaking of the fixing rod 46 inside the fixing hole 47. As an elastic material, the rubber ring can absorb and buffer the friction and vibration between the fixing rod 46 and the fixing hole 47 to a certain extent, thereby reducing the noise generated by the friction, further improving the working environment, and enhancing the comfort of the operator.

[0060] After removing the shell 32, the operator can pinch the two ends of the spring piece 5 with his hands and apply force to bend the spring piece 5, thereby shortening the length of the spring piece 5, making it easier to remove the spring piece 5 from the inside of the wire feeding wheel 3, thereby completing the replacement of the spring piece 5. The simple replacement method reduces the additional costs incurred by the complicated disassembly and installation process. At the same time, since the equipment downtime is reduced, the economic losses caused by production interruptions are also reduced.

[0061] By making the lengths of multiple limit rods 45 consistent, the positions of the spring pieces 5 can be evenly supported and limited, ensuring that the spring pieces 5 maintain a stable arrangement and distribution inside the wire feeding wheel 3, thereby reducing the problem of axial deviation of the wire feeding wheel 3 caused by the elastic difference of the spring pieces 5, further improving the overall operating stability of the wire feeding wheel 3, ensuring the stability of continuous transmission of the metal wire, and preventing interruptions in the metal wire transmission process.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A supersonic arc spraying device, characterized in that: The supersonic arc spraying device comprises: a supersonic arc spraying device body (1), an outer wall of one end of the supersonic arc spraying device body (1) is fixedly connected to a power source (11), the other end of the supersonic arc spraying device body (1) is fixedly connected to a spraying port (12), a wire tube (13) is fixedly connected to the outer wall of one side of the supersonic arc spraying device body (1) near the spraying port (12), and an outer wall of one side of the supersonic arc spraying device body (1) is fixedly connected to the wire tube (13). A wire tube 2 (14) is fixedly connected to the side of the wall close to the power source (11), a mounting seat 1 (34) is fixedly connected to the outer walls on both sides of the supersonic arc spraying device body (1), a wire feeding wheel (3) is rotatably connected to the outer walls on the opposite sides of the two mounting seats 1 (34), a mounting seat 2 is fixedly connected to the outer wall of one side of the supersonic arc spraying device body (1) close to the top of the mounting seat 1 (34), and a fixing sleeve (2) is fixedly connected to the outer wall on one side of the mounting seat 2.

2. A supersonic arc spraying device according to claim 1, characterized in that: The interior of the fixed sleeve (2) is fixedly connected to a raised plate (23), the interior of the fixed sleeve (2) is slidably connected to a protective shell (21), the interior of the protective shell (21) is slidably connected to the outer wall of the raised plate (23), a return spring (22) is fixedly connected to the outer wall of one side of the raised plate (23), and the outer walls of one end of the two return springs (22) are fixedly connected to one side of the interior of the protective shell (21).

3. A supersonic arc spraying device according to claim 1, characterized in that: The two wire feeding wheels (3) are provided with cavities inside, elastic rings (31) are fixedly connected to both sides of the cavity, the inner ring wall of the elastic ring (31) is movably in contact with a shell (32), the outer wall of the wire feeding wheel (3) is provided with a groove, the outer wall of the wire feeding wheel (3) close to the outer side of the groove is fixedly connected to a gear (33), and the interior of the groove is fixedly connected to a plurality of elastic protrusions (35).

4. A supersonic arc spraying device according to claim 3, characterized in that: Grooves are provided on both sides of the cavity, and elastic sheets (5) are movably inserted into the grooves. Rubber strips (51) are fixedly connected to both ends of one side of the elastic sheet (5).

5. A supersonic arc spraying device according to claim 3, characterized in that: The outer wall of one side of the wire feeding wheel (3) is provided with a limit groove (41), the inner wall of one side of the shell (32) is highly connected to a limit block (42), the outer wall of the limit block (42) is movably plugged into the inside of the limit groove (41), the outer wall of one side of the wire feeding wheel (3) is fixedly connected with a mounting groove (44), and a plurality of limit rods (45) are movably plugged into the inside of the mounting grooves (44).

6. A supersonic arc spraying device according to claim 5, characterized in that: A fixing hole (47) is formed on the outer wall of one side of the plurality of limit rods (45); a fixing rod (46) is movably inserted into the fixing hole (47); a rubber ring is formed on the outer wall of the fixing rod (46); the outer wall of one end of the plurality of fixing rods (46) is fixedly connected to the same elastic fixing ring (4); the outer wall of one side of the installation groove (44) is fixedly connected to a fixing spring (48); and the outer wall of one end of the fixing spring (48) is fixedly connected to the outer wall of one side of the elastic fixing ring (4).

7. A supersonic arc spraying device according to claim 3, characterized in that: The outer wall of the housing (32) is fixedly connected with a plurality of fixing grooves (43), and the interior of the fixing grooves (43) is slidably connected with the outer wall of the limiting rod (45).

8. A supersonic arc spraying process, which is implemented by a supersonic arc spraying device according to any one of claims 1 to 7, and the supersonic arc spraying process comprises the following steps: S1: Rust removal: the surface cleanliness of the workpiece should reach Sa3 level specified in GB / T 8923, that is, the surface should be free of visible oil, grease and dirt, and should be free of oxide scale, rust, coating and foreign impurities, and should have a uniform metallic color; S2: Supersonic arc spraying, 1) Compressed air pressure: 0.5-0.8 MPa, so that the coating particles obtain a higher energy velocity, resulting in an increase in the coating particle density, a reduction in pores, an increase in the coating adhesion, and an improvement in the corrosion protection effect; 2) Spraying distance: The vertical distance from the spray gun nozzle to the workpiece surface is controlled at 80-150 mm; 3) Working current: 130A ~ 210A, input voltage: 380V / 50Hz, no-load voltage: 25V ~ 30V; 4) Spraying angle: the spray gun is perpendicular to the working surface; 5) Spray wire feeding speed: refer to the equipment manual (reference number is 2.5-4.5 m / min); 6) Spray gun moving speed: preferably 200-400 mm / s, and the moving speed should be uniform; 7) Spraying temperature: The surface temperature of the workpiece during spraying is less than 200°C; 8) Spraying environment: air temperature > 5°C, relative humidity ≤ 80%, metal surface temperature is 3°C higher than the air dew point temperature, wind force ≤ level 5, and no dust in the air; S3: Surface cleaning: Use clean air to blow away or vacuum the dust on the surface of the metal coating before sealing. The time interval should not be too long to prevent oxidation of the metal coating. S4: Apply sealing paint (sealing holes). Before sealing holes, check whether the thickness of the metal coating meets the design requirements and whether there are obvious defects on the surface; S5: Finished product inspection: the appearance should be uniform, without peeling, cracking, splashing, raw silk adhesion and other defects.

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