Preparation device and preparation method of anti-corrosion fatigue coating of shaft component

Abstract

The embodiment of the invention provides a preparation device and a preparation method of an anti-corrosion fatigue coating of a shaft component, and relates to the technical field of metal material processing and surface treatment. The manufacturing device comprises a machine tool, and the shaft component is rotationally arranged on the machine tool; the laser cladding device is mounted on the machine tool; the laser cladding device comprises a cladding head; the cladding head coaxially sprays alloy powder and a laser beam to the surface of the shaft component to form a coating; the ultrasonic rolling device is installed on the machine tool and located on one side of the shaft component; the ultrasonic rolling device comprises a rolling head; the rolling head is used for rolling the surface of the coating; the control device is connected with the cladding head and the rolling head and used for controlling the cladding head and the rolling head to act synchronously. According to the preparation device and the preparation method of the corrosion and fatigue resistant coating of the shaft component, the cladding procedure and the ultrasonic rolling procedure are synchronously carried out, so that the compactness of the coating can be remarkably improved, and meanwhile, the fatigue resistance is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material processing and surface treatment, and in particular to a device and method for preparing a corrosion-resistant fatigue coating for a shaft component. Background Art

[0002] Axial components such as oil drill pipes are the primary tools for transmitting power and transporting mud. In oil drilling operations, drill pipes not only withstand wear and fatigue from cyclic loads, but are also frequently exposed to corrosive environments, particularly those containing hydrogen sulfide and brine. These environments can cause corrosion fatigue damage to the drill pipe material, seriously impacting the efficiency and safety of drilling operations. In recent years, with the advancement of drilling in deeper layers and deeper waters, the problem of drill pipe corrosion fatigue failure has become increasingly serious and urgently requires resolution. To address this issue, researchers have begun developing corrosion-resistant nickel-based alloy drill pipes. While nickel-based alloy drill pipes can effectively address the corrosion fatigue failure problem of drill pipes, their insufficient strength, poor corrosion fatigue resistance, and high cost limit their large-scale application. Therefore, developing high-performance coating technologies that combine wear resistance with corrosion fatigue resistance and excellent cost-effectiveness has become an important research direction for addressing the fatigue failure problem of axial components such as drill pipes. Summary of the Invention

[0003] In order to solve the technical problem of poor corrosion fatigue resistance of shaft components in the prior art, the present invention provides a device and method for preparing a corrosion fatigue resistance coating for shaft components. The technical solution is as follows:

[0004] The present invention provides a device for preparing a corrosion-resistant fatigue coating for a shaft component, comprising:

[0005] A machine tool, wherein a shaft-like component is rotatably arranged on the machine tool;

[0006] A laser cladding device is installed on the machine tool; the laser cladding device includes a cladding head; the cladding head coaxially sprays alloy powder and a laser beam onto the surface of the shaft component and forms a coating on the surface of the shaft component;

[0007] An ultrasonic rolling device is installed on the machine tool on one side of the shaft component; the ultrasonic rolling device includes a rolling head; the rolling head performs a rolling process on the surface of the coating;

[0008] The control device is connected to the cladding head and the rolling head respectively, and is used to control the cladding head and the rolling head to move synchronously.

[0009] Optionally, the control device includes: a central control module and a driving module; the central control module is connected to the driving module, and the driving module is connected to the cladding head and the rolling head respectively;

[0010] The driving module includes: the driving module includes: a first driving mechanism, a second driving mechanism, a third driving mechanism and a fourth driving mechanism; the first driving mechanism is used to drive the cladding head to move along the axial direction of the shaft component; the second driving mechanism is used to drive the cladding head to move along the axial direction perpendicular to the shaft component; the third driving mechanism is used to drive the rolling head to move along the axial direction of the shaft component; the fourth driving mechanism is used to drive the rolling head to move along the axial direction perpendicular to the shaft component;

[0011] The central control module controls the first drive mechanism and the third drive mechanism to move synchronously, and the central control module controls the second drive mechanism and the fourth drive mechanism to move synchronously.

[0012] Optionally, the rotation speed of the shaft component is 200 r / min~400 r / min; the feed rate of the rolling head is 0.1 mm / r~0.2 mm / r.

[0013] Optionally, the laser cladding device further includes: a feeding cylinder; the feeding cylinder is connected to the cladding head.

[0014] Optionally, the device for preparing the corrosion fatigue resistant coating for shaft components further comprises:

[0015] A cooling system installed on the ultrasonic rolling device includes: a first cooling module and a second cooling module; the ultrasonic rolling device also includes: a pressure sensor, the pressure sensor is arranged on the rolling head, and the pressure sensor is connected to the control device; the first cooling module is used to cool the rolling head, and the second cooling module is used to cool the pressure sensor; the temperature of the rolling head is controlled by the first cooling module to ≤100°C and the temperature of the pressure sensor is controlled by the second cooling module to ≤40°C.

[0016] The embodiment of the present invention further provides a method for preparing a corrosion-resistant fatigue coating for a shaft component, using the above-mentioned device for preparing a corrosion-resistant fatigue coating for a shaft component; the preparation method comprises:

[0017] S1: using a laser cladding device, coaxially ejecting alloy powder and a laser beam from a cladding head onto the surface of the shaft component to form a coating on the surface of the shaft component;

[0018] S2: The control device controls the rolling head of the ultrasonic rolling device and the cladding head of the laser cladding device to move synchronously, and the rolling head rolls the surface of the coating to obtain a corrosion-resistant fatigue coating for the shaft component after rolling.

[0019] Optionally, the laser cladding power of the laser cladding device in the S1 is 3kw-6kw, and the cladding rate is ≥100 m / min; the powder feeding rate of the laser cladding device is 20-50g / min.

[0020] Optionally, the rolling force of the rolling head in the S2 is 0.5kN-2 kN, and the ultrasonic frequency is 20kHz-30 kHz.

[0021] Optionally, after the step S2, the surface of the coating is further subjected to laser polishing treatment by a laser cladding device; the laser polishing power is 50%-80% of the laser cladding power.

[0022] Optionally, the cladding overlap rate of the laser cladding device is 75%-90%, and the polishing overlap rate is 50%-60%.

[0023] The technical scheme provided by the embodiment of the application has at least the following beneficial effects:

[0024] The embodiment of the application provides a preparation device and a control method for an anti-corrosion fatigue coating of a shaft member, the cladding process and the ultrasonic rolling process are synchronously performed, the ultrasonic rolling is immediately implemented after cladding, the characteristics of the metal in the high-temperature plastic state are utilized, the high-frequency impact can completely close pores and dynamically compact the un-solidified area of the molten pool, so that the interdendritic microcracks are eliminated, and the coating density is significantly improved; meanwhile, the metal in the high-temperature plastic state is more easily deformed, the synchronous ultrasonic rolling can introduce the uniformly distributed residual compressive stress on the surface of the coating, the generation and expansion of the fatigue cracks are effectively inhibited, and the anti-fatigue performance is greatly improved; in addition, the synchronous process can complete the cladding and rolling only by single thermal cycle, not only the energy consumption is reduced, but also the process interval is eliminated, the processing time is significantly shortened, and the processing efficiency is improved as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0026] Figure 1 is a structural schematic diagram of a preparation device for an anti-corrosion fatigue coating of a shaft member provided by the embodiment of the application;

[0027] Figure 2 is a local enlarged structural schematic diagram of a preparation device for an anti-corrosion fatigue coating of a shaft member provided by the embodiment of the application;

[0028] Figure 3This is a schematic diagram of the structure of a control device provided by an embodiment of the present invention;

[0029] Figure 4 This is the surface corrosion morphology of oil drill pipe with and without coating;

[0030] Figure 5 This is a microscopic observation of the corrosion fatigue fracture of the oil drill pipe in the uncoated and coated states;

[0031] Figure 6 It is a corrosion fatigue life curve of oil drill pipe in uncoated and coated states.

[0032] Reference numerals:

[0033] 100-Machine tools; 101-Shaft components;

[0034] 200-laser cladding device; 201-cladding head; 202-feeding barrel;

[0035] 300-ultrasonic rolling device; 301-rolling head; 302-pressure sensor; 303-ultrasonic generator;

[0036] 400-control device; 401-central control module; 402-drive module;

[0037] 402-driving module; 4021-first driving mechanism; 4022-second driving mechanism; 4023-third driving mechanism; 4024-fourth driving mechanism;

[0038] 1-driving motor; 2-screw rod; 3-nut; 4-sliding part. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described 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.

[0040] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meaning understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as "include" or "comprising" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0041] It should be noted that the terms "up", "down", "left", "right", "front" and "back" used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0042] Figure 1 This is a schematic diagram of the structure of a device for preparing a corrosion-resistant fatigue coating for a shaft component provided by an embodiment of the present invention. Figure 1 An embodiment of the present invention provides a device for preparing a corrosion-resistant fatigue coating on a shaft component 101. The device includes: a machine tool 100, a laser cladding device 200, an ultrasonic rolling device 300, and a control device 400. The shaft component 101 is rotatably mounted on the machine tool 100. The laser cladding device 200 is mounted on the machine tool 100. The laser cladding device 200 includes: a cladding head 201. Under the action of a driving force, the cladding head 201 coaxially ejects alloy powder and a laser beam onto the surface of the shaft component 101 and forms a coating on the surface of the shaft component 101. The ultrasonic rolling device 300 is mounted on the machine tool 100 and is located on one side of the shaft component 101. The ultrasonic rolling device 300 includes: a rolling head 301. Under the action of a driving force, the rolling head 301 rolls the surface of the coating. The control device 400 is connected to the cladding head 201 and the rolling head 301, respectively, and is used to control the synchronous operation of the cladding head 201 and the rolling head 301.

[0043] The machine tool 100 is used to clamp and drive a shaft component 101 to rotate. The shaft component 101 includes but is not limited to oil drill pipes, automobile transmission shafts, ship propulsion shafts, mining machinery shafts, etc.

[0044] The laser cladding device 200 can be a laser cladding machine, a device that uses laser technology for 3D additive manufacturing and metal surface repair. The cladding head 201 is the core actuator of the laser cladding device 200. Its function is to precisely deliver laser energy and alloy powder to the surface of the shaft component 101, forming a high-performance coating through high-temperature melting.

[0045] The laser cladding apparatus 200 specifically includes a feeder 202 and a cladding head 201. The cladding head 201 has a nozzle and a built-in lens or reflector. A high-energy-density laser beam is focused onto the surface of the shaft component 101 through the lens or reflector within the cladding head 201. The feeder 202 communicates with the nozzle of the cladding head 201, transporting alloy powder stored in the feeder 202 to the cladding head 201, where it is ejected through the nozzle onto the surface of the shaft component 101.

[0046] The ultrasonic rolling device 300 can be an ultrasonic rolling machine. Leveraging the cold plasticity of metal at room temperature, ultrasonic waves are used to grind the metal surface without a grinder. The high-frequency impact of ultrasonic waves refines the surface grains of the cladding layer, improving the coating's strength and hardness. It also eliminates microscopic defects (such as pores and microcracks) in the laser cladding layer, reduces surface roughness, and promotes plastic flow of the cladding metal, increasing the coating's density. The static pressure of the rolling head 301 and the ultrasonic vibrations synergistically form a residual compressive stress layer on the coating surface, effectively inhibiting fatigue crack initiation and propagation.

[0047] The ultrasonic rolling device 300 may specifically include: an ultrasonic generator 303, a rolling head 301, and a pressure sensor 302. The ultrasonic generator 303 is used to convert electrical energy into high-frequency mechanical vibrations and transmit them to the rolling head 301 through a horn, thereby achieving high-frequency impact on the coating surface. The rolling head 301 is the core executive component of the ultrasonic rolling device 300, directly acting on the surface of the shaft component 101. Through the combined effects of high-frequency impact and static rolling, it achieves coating strengthening, defect repair, and performance improvement. The rolling head 301 can be made of cemented carbide and can be spherical with a diameter of 10-15 mm. The pressure sensor 302 is arranged on the rolling head 301 and is connected to the control device 400. The pressure sensor 302 is used to detect the rolling pressure applied by the rolling head 301 on the coating and transmit the detection information to the control device 400. The control device 400 can control the driving force applied to the rolling head 301. The ultrasonic rolling device 300 may also include a first cooling module and a second cooling module; the first cooling module cools down the rolling head 301, and the second cooling module cools down the pressure sensor 302. As the hardness of cemented carbide decreases with increasing temperature, wear resistance decreases, increasing the risk of surface scratches. High-temperature thermal expansion can also cause deformation of the spherical shape, leading to uneven strengthening of the coating. Secondly, the high-temperature rolling head 301 will conduct heat to the ultrasonic rolling pressure sensor 302, causing the pressure sensor temperature to rise, thereby reducing the stability of the pressure output. Therefore, the embodiment of the present invention controls the temperature of the rolling head 301 to ≤100°C and the temperature of the pressure sensor to ≤40°C to avoid affecting the rolling pressure fluctuation and causing a decrease in the fatigue performance of the surface coating.

[0048] The embodiments of the present invention take into account the following defects of performing cladding and rolling separately: 1) pores and microcracks may form in the cladding layer after cooling, which are difficult to completely repair by subsequent rolling; 2) performing cladding and rolling separately will also increase the process time and reduce processing efficiency.

[0049] Therefore, the embodiment of the present invention performs the cladding process and the ultrasonic rolling process simultaneously, and performs ultrasonic rolling immediately after cladding. By utilizing the characteristic that the metal is still in a high-temperature plastic state, the high-frequency impact can completely close the pores and dynamically compact the unsolidified areas of the molten pool, thereby eliminating the microcracks between the dendrites and significantly improving the density of the coating; at the same time, the metal in the high-temperature plastic state is easier to deform, and the synchronous ultrasonic rolling can introduce uniformly distributed residual compressive stress on the coating surface, effectively inhibiting the initiation and expansion of fatigue cracks, and greatly improving the fatigue resistance; in addition, the synchronous process also eliminates the process interval, significantly shortens the processing time, and improves the overall processing efficiency.

[0050] Figure 3 This is a schematic diagram of the structure of a control device provided by an embodiment of the present invention. Figure 3The control device 400 may include a central control module 401 and a drive module 402. The central control module 401 is connected to the drive module 402, which is connected to the cladding head 201 and the rolling head 301, respectively. The central control module 401 may utilize a PLC-based multi-axis CNC system to control the drive module 402 to synchronize the cladding head 201 and the rolling head 301. Synchronous operation means that the cladding head 201 and the rolling head 301 are activated simultaneously, and the movement speed along the axis of the shaft-like component and along the axis perpendicular to the shaft-like component is the same.

[0051] In this embodiment, the rotation speed of the shaft component 101 is 200r / min~400r / min; the feed rate of the rolling head 301 is 0.1mm / r~0.2mm / r. The shaft rotation speed determines the coverage density of the coating on the shaft surface, and the feed rate of the rolling head 301 affects the superposition rate of a single rolling. By using a rolling force with a medium rotation rate and a low feed rate, a uniform compressive stress layer can be formed on the coating surface, and deep grain refinement can be performed. The residual compressive stress is stable, which can significantly improve the strengthening effect of fatigue resistance. If the shaft rotation speed is too high and the surface coating overlap rate is low, unfused defects will occur, reducing fatigue resistance. If the feed is too fast, the rolling impact energy is insufficient, resulting in residual pores and reducing the strength and density of the coating.

[0052] In some embodiments, see Figure 1 The driving module 402 may include: a first driving mechanism 4021, a second driving mechanism 4022, a third driving mechanism 4023 and a fourth driving mechanism 4024; the first driving mechanism 4021 is used to drive the cladding head to move along the axis direction of the shaft component; the second driving mechanism 4022 is used to drive the cladding head to move along the axis direction perpendicular to the shaft component; the third driving mechanism 4023 is used to drive the rolling head to move along the axis direction of the shaft component; the fourth driving mechanism 4024 is used to drive the rolling head to move along the axis direction perpendicular to the shaft component;

[0053] The central control module controls the first driving mechanism 4021 and the third driving mechanism 4023 to move synchronously, and the central control module controls the second driving mechanism 4022 and the fourth driving mechanism 4024 to move synchronously.

[0054] Figure 2 This is a partially enlarged structural diagram of a device for preparing a corrosion-resistant fatigue coating for a shaft component provided by an embodiment of the present invention. Figure 2The first drive mechanism 4021, the second drive mechanism 4022, the third drive mechanism 4023, and the fourth drive mechanism 4024 all have the same structure. The first drive mechanism 4021 may include: a drive motor 1, a screw rod 2, a nut 3, and a sliding member 4. The output shaft of the drive motor 1 is connected to the screw rod 2 to drive the screw rod 2 to rotate. The nut 3 is threadedly mounted on the screw rod 2. The sliding member 4, through the nut 3, performs linear reciprocating motion along the axial direction of the screw rod 2 under the action of the rotation of the screw rod 2.

[0055] Among them, the first driving mechanism 4021 is installed on the platform of the machine tool 100, the second driving mechanism 4022 is installed on the sliding member 4 of the first driving mechanism 4021 to realize movement along the axial direction of the shaft-like component, and the cladding head 201 is installed on the sliding member 4 of the second driving mechanism 4022 to realize movement along the axial direction of the vertical shaft-like component; similarly, the third driving mechanism 4023 is installed on the platform of the machine tool 100, the fourth driving mechanism 4024 is installed on the sliding member 4 of the third driving mechanism 4023 to realize movement along the axial direction of the shaft-like component, and the rolling head 301 is installed on the sliding member 4 of the third driving mechanism 4023 to realize movement along the axial direction of the vertical shaft-like component.

[0056] The embodiment of the present invention further provides a method for preparing a corrosion-resistant fatigue coating on a shaft component 101, using the apparatus for preparing a corrosion-resistant fatigue coating on a shaft component 101 of the above embodiment; the preparation method comprises:

[0057] S1: The laser cladding device 200 coaxially sprays alloy powder and a laser beam from the cladding head 201 onto the surface of the shaft component 101 to form a coating on the surface of the shaft component 101;

[0058] S2: The control device 400 controls the rolling head 301 of the ultrasonic rolling device 300 and the cladding head 201 of the laser cladding device 200 to move synchronously. The rolling head 301 rolls the surface of the coating to obtain a corrosion fatigue resistant coating for the shaft component after rolling.

[0059] Before step S1 , step S0 may be further included: performing surface treatment on the shaft component 101 .

[0060] In step S0, the specific process of surface treatment of the shaft component 101 is as follows: (1) Clamping the drill rod: Clamp the shaft component 101 on the machine tool 100, and use an angle grinder to remove rust from the surface of the shaft component 101, remove the surface oxide layer, oil stains and other impurities, and ensure that the surface cleanliness meets the requirements, thereby reducing defects in the coating and improving the bonding strength between the coating and the substrate. The rotation speed of the shaft component 101 is controlled within the range of 200 rpm to 400 rpm.

[0061] In step S1, the specific process of laser cladding is as follows: 1) the alloy powder is dried in a drying oven and then loaded into a sealed feed drum; 2) the alloy powder is transported to the cladding head 201 under the protective gas of high-purity argon. To ensure a stable powder feeding flow rate, the powder feeding rate is controlled within the range of 20-50 g / min; 3) the laser cladding parameters are set: the laser cladding power is 3 kW to 6 kW; the cladding overlap rate is 75% to 90%; 4) the laser cladding device 200 is started, the laser beam melts the alloy powder and forms a metallurgical bond with the shaft component 101 substrate, so that the coating is evenly covered on the surface of the shaft component 101, forming a dense alloy coating.

[0062] In step S2, the control device 400 controls the simultaneous activation of the laser cladding device 200 and the ultrasonic rolling device 300, and controls the synchronous operation of the cladding head 201 and the rolling head 301. The specific process of ultrasonic rolling is as follows: 1) Set the ultrasonic rolling parameters: the rolling force of the ultrasonic rolling device 300 is 0.5 kN to 2 kN, the ultrasonic frequency is 20 kHz to 30 kHz; the feed rate of the rolling head 301 is 0.1 mm / r to 0.2 mm / r; 2) Activate the first and second cooling modules, control the operating temperature of the rolling head 301 to ≤100°C, and the operating temperature of the pressure sensor 302 to ≤40°C; 3) Start the ultrasonic rolling device 300 and perform rolling on the coating surface.

[0063] After step S2 , the method may further include step S3 : performing laser polishing on the coating surface by using the laser cladding device 200 .

[0064] In step S3, the laser polishing process is as follows: 1) The laser cladding device 200 and ultrasonic rolling device 300 are shut down via the control device 400; 2) The laser polishing parameters are set: the working distance of the cladding head 201 is raised by 2 to 5 cm to a defocused state, the laser frequency of the laser cladding device 200 is adjusted to 50% to 80% of the laser frequency during cladding, and the polishing overlap ratio is adjusted to 50% to 60%; 3) The material feed is stopped, and the coating surface is laser polished by the cladding head 201 to reduce surface roughness; 4) The ultrasonic rolling device 300 is simultaneously activated and a secondary rolling process is performed on the laser-polished coating surface using the same ultrasonic rolling parameters as in step S2. Laser polishing can make the coating surface denser and introduce residual compressive stress within the coating, further improving fatigue resistance.

[0065] The following is further described with reference to specific examples.

[0066] Example 1

[0067] The anti-corrosion fatigue coating of the shaft component 101 provided in the embodiment of the present invention is prepared by the following steps:

[0068] 1) Surface treatment of shaft member 101:

[0069] The shaft member 101 is clamped on the machine tool 100, and the surface of the shaft member 101 is treated by using an angle grinder to remove the oxide layer, oil stains and other impurities on the surface, so that the surface cleanliness meets the requirements, thereby reducing defects in the coating and improving the bonding strength of the coating and the substrate. The rotational speed of the shaft member 101 is controlled to be 200 r / min;

[0070] 2) Laser cladding: After drying the alloy powder in a drying box, it is loaded into a sealed feeding cylinder; under the protection of high-purity argon gas, the alloy powder is transported to the cladding head 201. In order to stabilize the powder feeding speed, the powder feeding pressure is kept stable, and the powder feeding speed is controlled to be 30 g / min; the laser cladding parameters are set as follows: the laser cladding power is 4 kw; the cladding overlap rate is 90%;

[0071] 3) Ultrasonic rolling: The ultrasonic rolling parameters are set as follows: the rolling force of the ultrasonic rolling device 300 is 1 kN, the ultrasonic frequency is 25 kHz; the feed rate of the rolling head 301 is 0.15 mm / r; the first and second cooling modules are started, and the working temperature of the rolling head 301 is controlled to be lower than 100℃, and the working temperature of the pressure sensor 302 is controlled to be lower than 40℃;

[0072] 4) Central control: The laser cladding device 200 and the ultrasonic rolling device 300 are controlled to be started simultaneously by the control device 400, and the cladding head 201 and the rolling head 301 are controlled to act synchronously. The cladding head 201 melts the alloy powder and forms a metallurgical bond with the substrate of the shaft member 101, so that the coating uniformly covers the surface of the shaft member 101, forming a dense alloy coating, and the rolling head 301 performs rolling treatment on the surface of the coating.

[0073] Example 2

[0074] The shaft member 101 corrosion fatigue resistant coating provided by the embodiment of the present application has the same preparation method as that of example 1, except that the rotational speed of the shaft member 101 is controlled to be 300 r / min, and the feed rate of the rolling head 301 is 0.1 mm / r.

[0075] Example 3

[0076] The shaft member 101 corrosion fatigue resistant coating provided by the embodiment of the present application has the same preparation method as that of example 1, except that the rotational speed of the shaft member 101 is controlled to be 400 r / min, and the feed rate of the rolling head 301 is 0.2 mm / r.

[0077] Performance test:

[0078] 1. Experimental object

[0079] Test group: petroleum drill pipe: 34CrNiMo steel, surface with the anti-corrosion fatigue nickel-based alloy coating of shaft member 101 prepared in Example 1

[0080] Control group: petroleum drill pipe: 34CrNiMo steel, surface without coating;

[0081] 2. Experimental process

[0082] The test group and the control group were respectively placed in a sodium chloride corrosion environment with a mass concentration of 3.5%, the corrosion morphology of the surface of the petroleum drill pipe was observed by a microscope, and the fatigue life under different stress amplitudes was measured.

[0083] 3. Experimental results and analysis

[0084] 3.1 Surface corrosion morphology

[0085] Figure 4 Fig. a~c is a surface corrosion morphology diagram of the petroleum drill pipe in the coated state; Figure 4 Fig. d~f is a surface corrosion morphology diagram of the petroleum drill pipe in the uncoated state.

[0086] From Figure 4 Fig. a~c can be seen that the surface of the coating has almost no corrosion, in contrast, Figure 4 Fig. d~f can be obviously observed that there are a large number of corrosion pits on the surface, indicating that the drill pipe without coating protection is seriously corroded in the corrosion environment.

[0087] Figure 5 Fig. a, b is a corrosion fatigue fracture microscope observation diagram of the petroleum drill pipe in the uncoated state; Figure 5 Fig. c, d is a corrosion fatigue fracture microscope observation diagram of the petroleum drill pipe in the coated state.

[0088] From Figure 5 It can be seen that the fatigue crack of the petroleum drill pipe without coating protection is initiated from the surface corrosion pit, while the surface of the petroleum drill pipe with coating protection is not corroded, and the fatigue crack is initiated from the inside of the sample, therefore, compared with the petroleum drill pipe without coating protection, the petroleum drill pipe with coating protection has higher fatigue strength.

[0089] 3.2 Anti-corrosion fatigue performance test

[0090] The anti-corrosion fatigue performance test results are shown in Table 1; Figure 6 Fig. is a corrosion fatigue life curve diagram of the petroleum drill pipe in the coated state.

[0091] Table 1 Anti-corrosion fatigue performance test results

[0092]

[0093] Figure 6 The corrosion fatigue life curves of oil drill pipes with and without coatings in a 3.5% NaCl corrosion environment are shown. Figure 6 It can be seen that the fatigue strength of the oil drill pipe under coating protection is significantly improved, and the fatigue strength is increased by more than 200 MPa compared with the uncoated state.

[0094] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A device for preparing a corrosion-resistant fatigue coating for a shaft component, characterized in that: include: A machine tool, wherein a shaft-like component is rotatably arranged on the machine tool; a laser cladding device, mounted on the machine tool; The laser cladding device comprises: a cladding head; the cladding head coaxially sprays alloy powder and a laser beam onto the surface of the shaft component and forms a coating on the surface of the shaft component; An ultrasonic rolling device is installed on the machine tool; the ultrasonic rolling device includes a rolling head; the rolling head performs rolling treatment on the surface of the coating; The control device is connected to the cladding head and the rolling head respectively, and is used to control the cladding head and the rolling head to move synchronously.

2. The device for preparing a corrosion-resistant fatigue coating for a shaft component according to claim 1, characterized in that: The control device includes: a central control module and a drive module; the central control module is connected to the drive module, and the drive module is respectively connected to the cladding head and the rolling head; The driving module includes: a first driving mechanism, a second driving mechanism, a third driving mechanism and a fourth driving mechanism; the first driving mechanism is used to drive the cladding head to move along the axial direction of the shaft-like component; the second driving mechanism is used to drive the cladding head to move along the axial direction perpendicular to the shaft-like component; the third driving mechanism is used to drive the rolling head to move along the axial direction of the shaft-like component; the fourth driving mechanism is used to drive the rolling head to move along the axial direction perpendicular to the shaft-like component; The central control module controls the first drive mechanism and the third drive mechanism to move synchronously, and the central control module controls the second drive mechanism and the fourth drive mechanism to move synchronously.

3. The device for preparing a corrosion fatigue resistant coating for a shaft component according to claim 1, characterized in that: The rotation speed of the shaft component is 200r / min~400r / min; the feed rate of the rolling head is 0.1mm / r~0.2mm / r.

4. The device for preparing a corrosion fatigue resistant coating for a shaft component according to claim 1, characterized in that: The laser cladding device further includes: a feeding cylinder; the feeding cylinder is connected to the cladding head.

5. The device for preparing a corrosion fatigue resistant coating for a shaft component according to claim 1, characterized in that: Also includes: A cooling system is installed on the ultrasonic rolling device, and the cooling system includes: a first cooling module and a second cooling module; the ultrasonic rolling device also includes: a pressure sensor, the pressure sensor is arranged on the rolling head, and the pressure sensor is connected to the control device; the first cooling module is used to cool the rolling head, and the second cooling module is used to cool the pressure sensor; the temperature of the rolling head is controlled by the first cooling module to ≤100°C, and the temperature of the pressure sensor is controlled by the second cooling module to ≤40°C.

6. A method for preparing a corrosion-resistant fatigue coating for a shaft component, characterized in that: A device for preparing a corrosion-resistant fatigue coating for a shaft component according to any one of claims 1 to 6; the preparation method comprises: S1: using a laser cladding device, coaxially ejecting alloy powder and a laser beam from a cladding head onto the surface of a shaft component to form a coating on the surface of the shaft component; S2: The control device controls the rolling head of the ultrasonic rolling device and the cladding head of the laser cladding device to move synchronously, and the rolling head rolls the surface of the coating to obtain a corrosion-resistant fatigue coating for the shaft component after rolling.

7. The method for preparing a corrosion fatigue resistant coating for a shaft component according to claim 6, characterized in that: The laser cladding power of the laser cladding device in S1 is 3 kW to 6 kW, and the cladding rate is ≥ 100 m / min; the powder feeding rate of the laser cladding device is 20 to 50 g / min.

8. The method for preparing a corrosion fatigue resistant coating for a shaft component according to claim 6, characterized in that: The rolling force of the rolling head of S2 is 0.5 kN~2 kN, and the ultrasonic frequency is 20 kHz~30 kHz.

9. The method for preparing a corrosion fatigue resistant coating for a shaft component according to claim 6, characterized in that: After step S2, the method further includes: performing laser polishing on the surface of the anti-corrosion fatigue coating of the shaft component by a laser cladding device; the laser polishing power is 50% to 80% of the laser cladding power.

10. The method for preparing the corrosion fatigue resistant coating for shaft components according to claim 9, characterized in that: The laser cladding device has a cladding overlap rate of 75% to 90%, and a polishing overlap rate of 50% to 60%.

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