Offshore wind power bearing heterogeneous material multi-field construction forming method

Abstract

The application discloses a kind of offshore wind power bearing heterogeneous material multi-field construction forming method, the contact surface of the inner ring and outer ring of offshore wind power bearing is sealed welding to obtain bearing ring blank, the bearing ring blank is hot-rolled, and bearing ring piece is prepared by synchronously applying pulse current during the hot-rolling, wherein the inner ring and outer ring are two different materials.The surface of the wind power bearing prepared by the application is copper alloy material, which has good corrosion resistance and abrasion resistance, the core is traditional alloy steel material, which has good strength and impact toughness, the heterogeneous interface also realizes mechanical combination and metallurgical combination, and finally obtains excellent comprehensive performance, which helps to realize the high-performance and low-cost manufacturing of wind power bearing heterogeneous material.

Description

Technical Field

[0001] This invention belongs to the field of bearing manufacturing technology, specifically relating to a multi-field construction and forming method for heterogeneous materials in offshore wind power bearings. Background Technology

[0002] Offshore wind power has become a key area of ​​development for many countries. Bearings are the core components of wind turbines, bearing the load of the rotor and supporting the rotation of the main shaft, directly determining the service performance and lifespan of the wind turbine. With the upgrading of megawatt-class wind turbines, the load on bearings has increased exponentially, requiring them to withstand extreme conditions such as alternating heavy loads, high humidity, and salt spray corrosion. This places high demands on the load-bearing capacity (up to hundreds of tons) and corrosion resistance (in extreme climates) of wind turbine main shaft bearings. Traditionally, wind turbine main bearings use single-element alloy steel. While this ensures load-bearing capacity, the corrosion resistance, thermal conductivity, and friction reduction properties of alloy steel are significantly insufficient, seriously hindering the independent development of long-life, highly reliable, and high-power wind turbine bearings.

[0003] Against this backdrop, the international community is actively developing heterogeneous materials for wind turbine bearings, using copper alloys and alloy steels. The mainstream method involves laser cladding to deposit a layer of copper alloy on the surface of the wind turbine bearing. However, the resulting cast copper alloy structure is prone to shrinkage cavities, poor microstructure density, and weak interfacial bonding, severely impacting the overall service performance of the bearing. Simultaneously, the high manufacturing cost of laser cladding hinders the widespread application of this technology. Therefore, there is an urgent need to develop high-performance, low-cost methods for constructing heterogeneous materials for wind turbine bearings. Summary of the Invention

[0004] In view of this, the present invention proposes a multi-field construction forming method for heterogeneous materials of offshore wind turbine bearings. The contact surfaces of the inner and outer rings of the offshore wind turbine bearing are sealed by welding to obtain a bearing ring blank. The contact surfaces of the bearing ring blank are then sealed by vacuum or protective atmosphere welding to obtain a bearing ring blank. The bearing ring blank is then hot rolled, and a pulsed current is applied simultaneously during the rolling process to fully bond the heterogeneous material interface under the action of multiple fields of heat, force and electricity, thereby achieving high-performance and low-cost manufacturing of heterogeneous materials for wind turbine bearings.

[0005] The technical solution of this invention is implemented as follows:

[0006] In a first aspect, the present invention provides a method for multi-field construction forming of heterogeneous materials for offshore wind turbine bearings. The method involves sealing the contact surfaces of the inner and outer rings of the offshore wind turbine bearing to obtain a bearing ring blank, hot rolling the bearing ring blank, and simultaneously applying a pulsed current during the hot rolling process to obtain a bearing ring component. The inner and outer rings are made of two different materials.

[0007] The basic shape of the bearing ring blank is obtained through vacuum or protective atmosphere welding. Electrically assisted hot rolling deformation accelerates the interdiffusion of metal atoms at the heterogeneous interface. Under the coupling of thermo-mechanical-electric fields, mechanical interlocking and atomic bonding of the corrosion-resistant copper alloy / high-strength alloy steel heterogeneous interface are promoted. This achieves atomic-level construction of the high-performance heterogeneous interface while rolling to the target bearing ring size. Simultaneously, the mechanical interlocking induced by external force in this invention is a weak interface, while the atomic bonding occurring under thermo / electric combined action is a strong interface. The presence of both strong and weak interfaces contributes to improving the bonding strength at the heterogeneous interface, thus comprehensively utilizing multi-field coupling to achieve multi-scale construction and forming of the heterogeneous interface.

[0008] Based on the above technical solution, the magnitude of the pulse current is further defined as follows:

[0009]

[0010] In the formula, I0 is the magnitude of the pulse current, H b Here, f is the height of the bearing ring blank, f is the frequency of the pulse current, and c is the frequency of the pulse current. p Let ρ be the specific heat capacity of the bearing ring blank, d be the density of the bearing ring blank, ρ be the resistivity of the bearing ring blank, and σ be the elongation of the bearing ring blank.

[0011] Wherein, c p The value of the material with the larger specific heat capacity in the inner and outer rings is taken, the value of d is taken as the value of the material with the larger density in the inner and outer rings, the value of ρ is taken as the value of the material with the larger resistivity in the inner and outer rings, and the value of σ is taken as the value of the material with a larger proportion in the inner and outer rings.

[0012] While a larger current can promote interface healing, the current cannot be too large. If the current is too large, the Joule heating effect will be too high, causing the temperature to exceed the forging temperature. At the same time, the increased temperature will cause abnormal grain growth, resulting in a poor microstructure and hindering performance improvement.

[0013] Furthermore, if the current is too low, the electric field will not be able to promote interface healing. Therefore, the current must be within a reasonable process range.

[0014] Based on the above technical solution, furthermore, during the hot rolling process, the main roll feed speed is...

[0015]

[0016] In the formula, V0 is the main roll feed speed, and D... b Let d be the outer diameter of the bearing ring blank. bR1 is the inner diameter of the bearing ring blank, R2 is the outer diameter of the main roll, I1 is the stable current and I1 is (10~50)I0, and I0 is the magnitude of the pulse current.

[0017] A relationship between rolling speed and pulse current magnitude was established. When the current is too high, the rolling speed can be appropriately reduced because the current induces a certain Joule heating effect, which can maintain the forging temperature range at a lower rolling speed and a longer rolling time, thus achieving interface healing. When the current is low, the Joule heating effect is weakened, and the rolling speed must be increased to avoid the temperature drop during rolling causing an increase in deformation resistance, leading to deformation damage and interface debonding.

[0018] Based on the above technical solutions, furthermore, in the hot rolling process, the rolling ratio is... Calculate the rolling ratio.

[0019] In the formula, k is the rolling ratio, and d b R1 is the inner diameter of the bearing ring blank, R2 is the outer diameter of the main roll, I0 is the magnitude of the pulse current, and σ is the elongation of the bearing ring blank, where σ is the elongation of the material that accounts for a larger proportion between the inner and outer rings.

[0020] When the rolling ratio is too large, the plastic deformation of the two materials is severe, the deformation difference between dissimilar materials increases, and interface damage is very likely to occur. When the rolling ratio is too small, the interface healing effect under mechanical and thermal loading cannot be achieved, and the effect on promoting interface healing is limited.

[0021] Based on the above technical solution, furthermore, after obtaining the bearing ring blank through sealing welding, the bearing ring blank is kept at a certain temperature, and then hot-rolled. The temperature holding is carried out in a vacuum furnace or a protective atmosphere furnace, and the temperature holding temperature is 0.85~0.9T. m The T m The melting point is the lower melting point of the material in the inner and outer rings, and the heat preservation time is 0.5 to 2 hours.

[0022] Based on the above technical solution, the dimensions of the bearing ring blank further satisfy the following relationship:

[0023] The inner diameter of the bearing ring blank is d. b =0.6~0.8d f ,

[0024] The outer diameter of the bearing ring blank is

[0025] The height of the bearing ring blank is H. b =H f ,

[0026] In the formula, A b D is the cross-sectional area of ​​the bearing ring blank. b Let d be the outer diameter of the bearing ring blank. b Let d be the inner diameter of the bearing ring blank. f H is the inner diameter of the bearing ring. f The height of the bearing ring is given.

[0027] Based on the above technical solutions, the depth of the sealing weld is further 15-35% of the total wall thickness.

[0028] Based on the above technical solutions, the hot rolling temperature is further defined as the intersection range of the forging temperatures of the inner and outer rings.

[0029] In order to ensure that the forging temperature meets the forging temperature requirements of both copper alloys and alloy steels, for example, the forging temperature of alloy steel is 850-1200℃ and the forging temperature of copper alloys is 700-900℃, the forging temperature to be selected in this invention is 850-900℃.

[0030] This avoids the problem of high resistance to plastic deformation, inconsistent deformation, and interface damage caused by a material not being in the forging temperature range.

[0031] Secondly, the present invention provides a bearing ring manufactured using the above method.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The surface of the heterogeneous material wind turbine bearing obtained in this invention is a copper alloy layer, which has good corrosion resistance and wear resistance. The core is a traditional alloy steel material, which has good strength and impact toughness. The heterogeneous interface also achieves mechanical and metallurgical bonding, ultimately achieving excellent comprehensive performance.

[0034] (2) The method used in this invention does not require the introduction of copper alloy by laser cladding. The thickness of the copper alloy layer can be adjusted according to performance requirements during the construction process, thereby significantly reducing the manufacturing cost of heterogeneous material wind turbine bearings. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1A flowchart of the multi-field construction and forming method for heterogeneous materials for offshore wind turbine bearings according to the present invention;

[0037] Figure 1 1. Main roll, 2. Core roll, 3. Upper conductive spring carbon brush, 4. Lower conductive spring carbon brush. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] This invention provides a method for multi-field fabrication of heterogeneous materials for offshore wind turbine bearings, comprising the following steps:

[0040] 1. Bearing ring blank size matching design

[0041] Based on the target bearing ring dimensions, design the bearing ring blank dimensions, and then, based on the bearing ring blank dimensions, design the inner and outer ring dimensions. The specific design rules are as follows:

[0042] (1) Determine the dimensions of the target bearing ring and the inner diameter and height of the bearing ring blank.

[0043] Determine the outer diameter D of the bearing ring based on the drawings or technical requirements. f , inner diameter d f and height H f The inner diameter d of the bearing ring blank is determined based on the dimensions of the bearing ring component. b d b =0.6~0.8d f The height H of the bearing ring blank b The equation is: Hb = Hf.

[0044] (2) Calculate the rolling ratio

[0045] Based on the inner diameter d of the bearing ring blank b The rolling ratio is calculated using the following formula, along with the initial rolling current I0.

[0046]

[0047] In the formula, k is the rolling ratio, and d b R1 is the inner diameter of the ring blank (m), R2 is the outer diameter of the main roll (m), I0 is the initial current (A), and σ is the elongation of the bearing ring blank, where σ is the value of the material with the larger proportion in the inner and outer rings.

[0048] (3) Determine the outer diameter of the bearing ring blank

[0049] The cross-sectional area (A) of the bearing ring is determined by the following formula. f ):

[0050]

[0051] The cross-sectional area (A) of the bearing ring blank is determined using the following formula based on the rolling ratio. b ):

[0052] A b =k×A f

[0053] The outer diameter (D) of the bearing ring blank is determined by the following formula. b ):

[0054]

[0055] In the formula, A f The cross-sectional area of ​​the bearing ring (m²) 2 ), A b The cross-sectional area of ​​the bearing ring blank (m²) 2 ), D b Let d be the outer diameter (m) of the bearing ring blank. b The inner diameter (m) of the bearing ring blank.

[0056] (4) Determine the dimensions of the inner and outer ring blanks of the bearing ring blank:

[0057] The interface diameter (R) is determined using the following formula:

[0058] R = d f +p(D f -d f )

[0059] In the formula, R is the interface diameter (m), and p is the proportion of the inner ring wall thickness to the total wall thickness.

[0060] Therefore, the inner ring blank dimensions are: the inner diameter is the inner diameter d of the bearing ring blank. b The outer diameter is the interface diameter R, and the height is the bearing ring blank height H. b Outer ring blank dimensions: inner diameter is the interface diameter R, outer diameter is the outer diameter D of the bearing ring blank. b The height is H, which is the height of the bearing ring blank. b .

[0061] 2. Pre-sealing connection of bearing ring blanks

[0062] The contact surfaces of the inner and outer rings of the bearing ring are machined and ground to control the surface roughness to Ra0.8μm~Ra1.6μm. Pre-treatment of the contact surfaces, including cleaning and degreasing, is then performed to remove surface oil, oxide layers, and impurities, ensuring the cleanliness and flatness of the substrate surface. Subsequently, vacuum or protective atmosphere sealing welding is performed, with a weld depth of 15%~35% of the wall thickness. After sealing welding, a complete bearing ring blank is obtained. During the welding process, measures such as increasing the welding speed and adding a transition layer can be taken to reduce oxide formation at the interface of dissimilar materials.

[0063] 3. Pre-connection of bearing ring blanks with insulation

[0064] The sealed bearing ring blank is then held in a vacuum furnace or a protective atmosphere furnace for 0.5–2 hours at a temperature of 0.85–0.9°C to promote interfacial atomic diffusion. m , among which, T m It is the melting point of the material with the lower melting point between the inner and outer ring materials.

[0065] 4. Electrically assisted rolling forming of bearing rings

[0066] like Figure 1 As shown, the equipment for electric assisted rolling is insulated, and then the positive and negative terminals of the pulse power supply are connected to the upper and lower conductive spring carbon brushes respectively. The upper conductive spring carbon brush (3) connected to the positive terminal contacts the main roll (1), and the lower conductive spring carbon brush (4) connected to the negative terminal contacts the core roll (2) to ensure that the carbon brushes do not affect the rotational feeding motion of the roll.

[0067] The heat-insulated bearing ring blank is placed in the rolling station of the hot rolling mill. The hot rolling temperature is the intersection of the forging temperatures of the inner and outer ring materials.

[0068] For example, the forging temperature of aluminum bronze alloy is 700-900℃, the forging temperature of 42CrMo alloy steel is 850-1200℃, and the final forging temperature is 850-900℃.

[0069] A pulsed current is applied using a pulsed power supply. The pulsed current passes through the contact point between the main roll and the bearing ring blank, and a current path is generated in the rolling deformation zone of the bearing ring blank.

[0070] Then, the main roll feed motion is controlled, and the main roll feed speed and rolling ratio are determined according to the bearing ring billet size and pulse current.

[0071] Once the rolling ratio reaches the set value, the main roll stops feeding, and the current is immediately cut off, thus completing the pulse current-assisted rolling forming process. The method for determining the processing parameters is as follows:

[0072] (1) Determination of pulse current frequency (f):

[0073] In order to achieve a high skin depth for the electromagnetic effect of the current to promote interface healing, the pulse current frequency f is 1-5 Hz.

[0074] (2) Determining the magnitude of the pulse current (I0):

[0075]

[0076] In the formula, I0 is the magnitude of the pulse current (A), and H b Here, f is the height of the bearing ring blank (m), f is the pulse frequency (Hz), and c is the pulse frequency (Hz). p ρ is the specific heat capacity of the bearing ring blank (J / (kg·K)), d is the density of the bearing ring blank (kg / m3), ρ is the resistivity of the bearing ring blank (Ω·m), and σ is the elongation of the ring blank.

[0077] Wherein, c p The value of the material with the larger specific heat capacity in the inner and outer rings is taken, the value of d is taken as the value of the material with the larger density in the inner and outer rings, the value of ρ is taken as the value of the material with the larger resistivity in the inner and outer rings, and the value of σ is taken as the value of the material with a larger proportion in the inner and outer rings.

[0078] (3) Determination of rolling feed speed (V0):

[0079]

[0080] In the formula, V0 is the main roll feed speed (m / h), and D... b Let d be the outer diameter (m) of the bearing ring blank. b R1 is the inner diameter of the bearing ring blank (m), R2 is the outer diameter of the main roll (m), I1 is the stable current (A) and I1 is (10~50)I0, and I0 is the pulse current magnitude (A).

[0081] Example 1: A method for multi-field fabrication of heterogeneous materials for offshore wind turbine bearings

[0082] In this embodiment, the dimensions of the wind power heterogeneous metal composite ring are Φ2.5m (outer diameter) × Φ2m (inner diameter) × 0.5m (height), and the inner diameter of the ring blank is determined to be Φ1.5m.

[0083] The outer ring is made of 42CrMo bearing steel, and the inner ring is made of QAl10-4-4 aluminum bronze alloy.

[0084] If the thickness of the aluminum bronze alloy accounts for 20%, then the interface diameter R = 2 + 0.2(2.5 - 2) = 2.1 m, the outer diameter of the main roll is 0.8 m, and the outer diameter of the core roll is 0.3 m. The specific preparation steps of the heterogeneous metal composite ring are as follows:

[0085] 1. Bearing ring blank size matching design

[0086] (1) Determination of ring blank dimensions:

[0087] outer diameter D of the ring f =2.5m, inner diameter d f =2m, height H f =0.5m; inner diameter d of the ring blank b = 1.5m, height H d =0.5m,

[0088] Through formula The calculated rolling ratio k is approximately 1.6.

[0089] The cross-sectional area of ​​the ring is: Ring billet cross-sectional area: A b =1.6 × 1.77 = 2.832m 2 ,

[0090] Calculate the outer diameter D of the ring blank b :

[0091] Therefore, the dimensions of the inner ring of the ring blank are: inner diameter Φ1.5m, outer diameter Φ2.1m, and height 0.5m; the dimensions of the outer ring of the ring blank are: inner diameter Φ2.1m, outer diameter Φ2.4m, and height 0.5m.

[0092] (2) Determination of pulse current and feed speed of main roll

[0093] The frequency f of the pulse current is set to 5 Hz, and the formula is used to determine the frequency. The calculated required pulse current I0 is approximately 550A;

[0094] Through formula The calculated feed speed V0 of the main roll is approximately 0.5 mm / s.

[0095] 2. Pre-sealing connection of ring billet

[0096] The inner and outer rings of the ring blank are machined according to the dimensions, and the surface roughness of the contact surface of the inner and outer rings is controlled at Ra0.9μm;

[0097] Then, the contact surfaces of the inner and outer rings are pretreated, including cleaning and degreasing, to remove surface oil, oxide layer and impurities, and ensure the cleanliness and flatness of the substrate surface.

[0098] Vacuum sealing is then performed, with a sealing depth of 20% of the total wall thickness, resulting in a bearing ring blank.

[0099] 3. Insulation and pre-connection of ring billet

[0100] The sealed bearing ring blank is kept at a temperature of 1000℃ in a vacuum furnace for 1 hour.

[0101] 4. Ring component electric assisted rolling forming

[0102] like Figure 1 As shown, the equipment for electric assisted rolling is insulated, and then the positive and negative terminals of the pulse power supply are connected to the conductive spring carbon brushes respectively. The upper conductive spring carbon brush (3) connected to the positive terminal contacts the main roll (1), and the lower conductive spring carbon brush (4) connected to the negative terminal contacts the core roll (2) to ensure that the carbon brushes do not affect the rotational feeding motion of the roll.

[0103] The heat-insulated bearing ring blank is removed and transferred to the hot rolling mill station, where it is rolled at 880℃.

[0104] A pulse current of 550A and 5Hz is applied using a pulse power supply;

[0105] The main roll is then controlled to feed at 0.5 mm / s. When the rolling ratio reaches the set value of 1.6, the main roll stops feeding and the current is immediately disconnected, thus completing the electric assisted rolling forming process and producing the bearing ring.

[0106] Comparative Example 1: A Multi-Field Construction Method for Heterogeneous Materials in Offshore Wind Turbine Bearings

[0107] This comparative example provides a multi-field construction method for heterogeneous materials for offshore wind turbine bearings, which is basically the same as Example 1, except that step 4 is not included in the preparation steps of this comparative example.

[0108] Comparative Example 2: A Multi-Field Construction Method for Heterogeneous Materials in Offshore Wind Turbine Bearings

[0109] This comparative example provides a multi-field construction method for heterogeneous materials for offshore wind turbine bearings, which is basically the same as Example 1, except that step 3 is not included in the preparation steps of this comparative example.

[0110] Comparative Example 3: A Multi-Field Construction Method for Heterogeneous Materials in Offshore Wind Turbine Bearings

[0111] This comparative example provides a multi-field construction method for heterogeneous materials of offshore wind turbine bearings, which is basically the same as Example 1. The difference is that this comparative example does not roll the bearing ring blank, that is, the main roll feed speed in step 4 is 0 and the rolling ratio is 0.

[0112] Comparative Example 4: A Multi-Field Construction Method for Heterogeneous Materials in Offshore Wind Turbine Bearings

[0113] This comparative example provides a multi-field construction method for heterogeneous materials of offshore wind turbine bearings, which is basically the same as Example 1, except that: no pulse current is applied to the bearing ring blank in this comparative example, that is, the magnitude and frequency of the pulse current in step 4 are 0.

[0114] Performance testing:

[0115] The bearing rings prepared in the above embodiments were subjected to a standard tensile test at room temperature. The tensile strength of the bearing rings prepared in Example 1 was found to be 710 MPa at the joint interface, which is significantly higher than the tensile strength of the cast QAl10-4-4 copper alloy.

[0116] The bearing ring obtained in Comparative Example 1 has a tensile strength of 255 MPa at the joint interface.

[0117] The bearing ring obtained in Comparative Example 2 has a tensile strength of 630 MPa at the joint interface.

[0118] The bearing ring obtained in Comparative Example 3 has a tensile strength of 397 MPa at the joint interface.

[0119] The bearing ring obtained in Comparative Example 4 has a tensile strength of 562 MPa at the joint interface.

[0120] By comparing the results of Example 1 and Comparative Example 1, it is shown that not performing electric assisted rolling on the bearing ring blank will lead to a decrease in tensile strength at the interface. The possible reason is that electric assisted rolling accelerates the diffusion of metal atoms at the heterogeneous interface. Without electric assisted rolling, although some atoms will diffuse at the interface after heat preservation, the interface is still in a weak bonding state. Furthermore, the unrolled material may retain casting or original defects, resulting in a decrease in the overall performance of the heterogeneous ring.

[0121] By comparing the results of Example 1 and Comparative Example 2, it is shown that failure to heat-insulate the bearing ring blank before hot rolling will lead to a decrease in the tensile strength at the interface. The possible reason is that proper heat-insulating diffusion was not carried out, and the atoms at the interface of copper alloy and alloy steel could not form a metallurgical bond through thermal activation diffusion. The structural stability at the interface is poor and it is easy to crack during subsequent processing or use.

[0122] By comparing the results of Example 1 and Comparative Example 3, it is shown that the absence of hot rolling will lead to a decrease in tensile strength at the interface. The possible reason is that the sealing weld only achieves physical bonding, without the high-temperature plastic deformation of hot rolling to promote interface morphology bonding, resulting in poor mechanical interlocking, the presence of pores and defects in the interface, weak interface bonding, and the material's deformation performance has not been optimized by forging.

[0123] Comparing the results of Example 1 and Comparative Example 4, it is shown that the absence of pulsed current during hot rolling leads to a decrease in tensile strength at the interface. This may be because pulsed current can reduce the rheological stress of the material through electroplasticity, promoting dislocation movement and atomic diffusion. Without current assistance, the atomic diffusion rate at the heterogeneous interface decreases, requiring longer rolling times or greater deformation to achieve the same bonding strength. However, large deformation and prolonged high temperatures can easily lead to abnormal grain growth, reducing the material's strength and toughness.

[0124] This demonstrates that the multi-field construction method for heterogeneous materials of wind turbine bearings proposed in this invention can obtain a high-strength metallurgical bonding interface, and the constructed copper alloy surface layer has excellent corrosion resistance and wear resistance, thereby realizing high-performance construction of heterogeneous materials for wind turbine bearings.

[0125] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for multi-field fabrication of heterogeneous materials for offshore wind turbine bearings, characterized in that, The contact surfaces of the inner and outer rings of an offshore wind turbine bearing are sealed by welding to obtain a bearing ring blank. The bearing ring blank is then hot-rolled, and a pulsed current is applied simultaneously during the hot rolling process to produce a bearing ring component. The inner and outer rings are made of two different materials. The magnitude of the pulse current is , In the formula, I 0 The magnitude of the pulse current, H b This refers to the height of the bearing ring blank. f The frequency of the pulse current, c p This refers to the specific heat capacity of the bearing ring blank. d The density of the bearing ring blank. ρ The resistivity of the bearing ring blank is given. σ This represents the elongation of the bearing ring blank. Among them, the c p Take the value of the material with the larger specific heat capacity between the inner and outer rings. d Take the value of the material with the higher density between the inner and outer rings, the ρ Choose the value with the larger resistivity between the inner and outer rings. σ Take the value of the material that accounts for the larger proportion between the inner and outer rings; During the hot rolling process, the main roll feed speed is: , In the formula, V 0 Main roll feed speed D b The outer diameter of the bearing ring blank. d b This refers to the inner diameter of the bearing ring blank. R 1 The outer diameter of the main roll, I 1 To stabilize the current and I 1 (10~50) I 0 , I 0 The magnitude of the pulse current; During the hot rolling process, the rolling ratio is , In the formula, k For rolling ratio, d b This refers to the inner diameter of the bearing ring blank. R 1 The outer diameter of the main roll, R 2 The outer diameter of the core roller. I 0 σ represents the magnitude of the pulse current, and σ represents the elongation of the bearing ring blank, where σ is the elongation of the material that accounts for a larger proportion between the inner and outer rings.

2. The multi-field construction and forming method for heterogeneous materials of offshore wind turbine bearings according to claim 1, characterized in that, After the bearing ring blank is obtained by sealing and welding, it is kept at a certain temperature and then hot-rolled. The holding temperature is carried out in a vacuum furnace or a protective atmosphere furnace, and the holding temperature is 0.85~0.9℃. T m The T m The melting point is the lower melting point of the material in the inner and outer rings, and the heat preservation time is 0.5~2 h.

3. The method for multi-field fabrication of heterogeneous materials for offshore wind turbine bearings according to claim 1, characterized in that, The dimensions of the bearing ring blank satisfy the following relationship: the inner diameter of the bearing ring blank is d b =0.6~0.8 d f , The outer diameter of the bearing ring blank is , The height of the bearing ring blank is H b H f , In the formula, A b Let be the cross-sectional area of ​​the bearing ring blank. D b The outer diameter of the bearing ring blank is given. d b The inner diameter of the bearing ring blank is [missing information]. d f The inner diameter of the bearing ring is [missing information]. H f The height of the bearing ring is [missing information]. H b The height of the bearing ring blank is given.

4. The multi-field construction and forming method for heterogeneous materials of offshore wind turbine bearings according to claim 1, characterized in that, The depth of the sealing weld is 15-35% of the total wall thickness.

5. The method for multi-field construction and forming of heterogeneous materials for offshore wind turbine bearings according to claim 1, characterized in that, The hot rolling temperature is the intersection range of the forging temperatures of the inner and outer rings.

6. The bearing ring obtained by the multi-field construction forming method of heterogeneous materials for offshore wind turbine bearings according to any one of claims 1 to 5.

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