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

Abstract

The invention discloses an offshore wind power bearing heterogeneous material multi-field construction forming method, which comprises the following steps: carrying out seal welding on the contact surface of an inner ring and an outer ring of an offshore wind power bearing to obtain a bearing ring blank, carrying out hot rolling on the bearing ring blank, and synchronously applying pulse current in the hot rolling process to obtain a bearing ring piece, the inner ring and the outer ring are made of two different materials. The surface of the prepared wind power bearing is made of a copper alloy material, the wind power bearing has good corrosion resistance and friction resistance, the core is made of a traditional alloy steel material, the wind power bearing has good strength and impact toughness, mechanical bonding and metallurgical bonding are achieved on a heterogeneous interface, and finally excellent comprehensive performance is obtained; and high-performance and low-cost manufacturing of heterogeneous materials of the wind power bearing can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing manufacturing, and in particular relates to a multi-field construction and forming method of heterogeneous materials for offshore wind power bearings. Background Art

[0002] Offshore wind power has become a key area of ​​development for all countries. Bearings are the core components of wind turbines that carry the rotor load and support the rotation of the main shaft, and directly determine the service performance and life of wind turbines. With the power upgrade of large-megawatt wind turbines, the load on the bearings has increased exponentially, and they need to face extreme working conditions such as alternating heavy loads, high humidity, and salt spray corrosion, which puts forward high load-bearing (up to hundreds of tons) and corrosion resistance (extreme climate) performance requirements for wind turbine main shaft bearings. Wind turbine main bearings traditionally use single-element alloy steel materials. Although the load-bearing capacity is guaranteed, the corrosion resistance, thermal conductivity and friction reduction properties of the alloy steel are obviously insufficient, which seriously affects the independent development of long-life, high-reliability, and high-power wind turbine bearings.

[0003] In the above context, the international community is actively developing copper alloy / alloy steel heterogeneous materials for wind turbine bearings. The mainstream method is to use laser cladding to build a layer of copper alloy on the surface of wind turbine bearings. However, the cast structure of the copper alloy formed is prone to shrinkage defects, poor organizational density, and poor interface bonding, which seriously affects the overall service performance of the bearing. At the same time, the high manufacturing cost of laser cladding also hinders the promotion and application of the technology. In the above context, there is an urgent need to develop high-performance and low-cost wind turbine bearing heterogeneous material construction and forming technology methods. Summary of the invention

[0004] In view of this, the present invention proposes a multi-field construction and forming method for heterogeneous materials of offshore wind power bearings, wherein the contact surfaces of the inner ring and the outer ring of the offshore wind power bearing are sealed and welded to obtain the contact surfaces of the bearing ring blank, and the bearing ring blank is sealed and welded in a vacuum or protective atmosphere to obtain the bearing ring blank. The bearing ring blank is then hot rolled, and a pulse current is simultaneously applied during the rolling process to enable the interface of the heterogeneous materials to be fully combined under the action of the thermal-mechanical-electrical multi-fields, thereby realizing high-performance and low-cost manufacturing of heterogeneous materials for wind power bearings.

[0005] The technical solution of the present invention is achieved in this way:

[0006] In the first aspect, the present invention provides a multi-field construction and forming method for heterogeneous materials of an offshore wind power bearing, wherein the contact surfaces of the inner ring and the outer ring of the offshore wind power bearing are sealed and welded to obtain a bearing ring blank, the bearing ring blank is hot rolled, and a pulse current is synchronously applied during the hot rolling process to obtain a bearing ring component, wherein the inner ring and the outer ring are two different materials.

[0007] The basic shape of the bearing ring blank is obtained by vacuum or protective atmosphere welding, and the mutual diffusion of metal atoms at the heterogeneous interface is accelerated by electrically assisted hot rolling ring deformation. Under the action of thermal-mechanical-electrical multi-field coupling, the mechanical intercalation and atomic bonding of the corrosion-resistant copper alloy / high-strength alloy steel heterogeneous interface are promoted, and the atomic-level construction of high-performance heterogeneous interface is achieved while rolling and forming to the target bearing ring size. At the same time, the mechanical intercalation of the heterogeneous interface caused by external force in the present invention is a weak interface, and the atomic bonding occurring under the action of heat / electricity is a strong interface. The appearance of strong / weak interfaces both help to improve the bonding strength at the heterogeneous interface, thereby comprehensively utilizing multi-field coupling to achieve multi-scale construction and forming of the heterogeneous interface.

[0008] On the basis of the above technical solution, further, the magnitude of the pulse current is:

[0009]

[0010] In the formula, I 0 is the magnitude of the pulse current, H b is the height of the bearing ring blank, f is the frequency of the pulse current, c p is the specific heat capacity of the bearing ring blank, d is the density of the bearing ring blank, ρ is the resistivity of the bearing ring blank, σ is the elongation of the bearing ring blank,

[0011] Among them, the c p Take the value of the material with larger specific heat capacity in the inner ring and the outer ring, take the value of the material with larger density in the inner ring and the outer ring, take the value of ρ with larger resistivity in the inner ring and the outer ring, and take the value of σ with a larger proportion in the inner ring and the outer ring.

[0012] Although a larger current can promote interface healing, the current cannot be too large, because if the current is too large, the Joule heat effect will be too high, causing the temperature to be higher than the forging temperature. At the same time, the increase in temperature causes abnormal grain growth, and the obtained organizational state is poor, which is not conducive to performance improvement.

[0013] In addition, if the current is too small, the electric field will not promote the interface healing. Therefore, the current must be within a reasonable process range.

[0014] On the basis of the above technical solution, further, during the hot rolling process, the main roll feed speed is

[0015]

[0016] Where V 0 Main roll feed speed, D b is the outer diameter of the bearing ring blank, d b is the inner diameter of the bearing ring blank, R 1is the outer diameter of the main roll, I 1 is a stable current and I 1 (10~50)I 0 , I 0 is the magnitude of the pulse current.

[0017] The relationship between rolling speed and pulse current size is established. When the current is too large, the rolling speed can be appropriately reduced, because the current causes a certain Joule heating effect, and the forging temperature range can still be maintained at a lower rolling speed and a longer rolling time to achieve interface healing. When the current is small, the Joule heating effect of the current is weakened, so the rolling speed must be increased to avoid the increase in deformation resistance caused by the temperature drop during rolling, resulting in deformation damage and interface debonding.

[0018] On the basis of the above technical solution, further, during the hot rolling process, the rolling ratio is Calculate the rolling ratio,

[0019] In the formula, k is the rolling ratio, d is b is the inner diameter of the bearing ring blank, R 1 is the outer diameter of the main roll, R 2 is the outer diameter of the core roller, I 0 is the magnitude of the pulse current, σ is the elongation of the bearing ring blank, wherein σ is the elongation of the material that accounts for a larger proportion of the inner ring and the outer ring.

[0020] When the rolling ratio is too large, the two materials will be severely plastically deformed, the deformation difference between the dissimilar materials will increase, and interface damage will easily occur. When the rolling ratio is too small, the interface healing effect under mechanical and thermal loading cannot be achieved, and the effect of promoting interface healing is limited.

[0021] On the basis of the above technical scheme, further, after the bearing ring blank is obtained by sealing and welding, the bearing ring blank is kept warm, and then the bearing ring blank is hot rolled, and the keeping warm is carried out in a vacuum furnace or a protective atmosphere furnace, and the keeping warm temperature is 0.85~0.9T m , the T m is the melting point of the material with the lower melting point in the inner ring and the outer ring, and the insulation time is 0.5 to 2 hours.

[0022] On the basis of the above technical solution, further, the size of the bearing ring blank satisfies 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 is the cross-sectional area of ​​the bearing ring blank, D b is the outer diameter of the bearing ring blank, d b is the inner diameter of the bearing ring blank, d f is the inner diameter of the bearing ring, H f is the height of the bearing ring.

[0027] On the basis of the above technical solution, further, the weld depth of the sealing welding is 15-35% of the total wall thickness.

[0028] On the basis of the above technical solution, further, the hot rolling temperature is the intersection interval of the forging temperatures of the inner ring and the outer ring.

[0029] In order to make the forging temperature meet the forging temperature requirements of copper alloy and alloy steel, for example, the forging temperature of alloy steel is 850-1200°C, and the forging temperature of copper alloy is 700-900°C, the forging temperature to be selected in the present invention is 850-900°C.

[0030] This can avoid the large resistance to plastic deformation, uncoordinated deformation and interface damage caused by a material being out of the forging temperature range.

[0031] In a second aspect, the present invention provides a bearing ring manufactured by 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 the present invention is a copper alloy layer, which has good corrosion resistance and wear resistance, and the core is a traditional alloy steel material, which has good strength and impact toughness. The heterogeneous interface also realizes mechanical bonding and metallurgical bonding, and finally obtains excellent comprehensive performance.

[0034] (2) The method adopted in the present 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 greatly reducing the manufacturing cost of heterogeneous material wind turbine bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a flow chart of the method for multi-field construction and forming of heterogeneous materials for offshore wind power bearings of the present invention;

[0037] Figure 1 1. Main roller, 2. Core roller, 3. Upper conductive spring carbon brush, 4. Lower conductive spring carbon brush. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0039] The present invention provides a method for multi-field construction of heterogeneous materials for offshore wind power bearings, comprising the following steps:

[0040] 1. Bearing ring blank size matching design

[0041] According to the target bearing ring size, the bearing ring blank size is designed, and then according to the bearing ring blank size, the inner and outer ring sizes are designed. The specific design rules are as follows:

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

[0043] Determine the outer diameter D of the bearing ring according to the drawing or technical requirements. f , inner diameter d f and height H f The inner diameter size d of the bearing ring blank is determined according to the size of the bearing ring. b , d b =0.6~0.8d f , the height H of the bearing ring blank b It is: Hb=Hf.

[0044] (2) Calculation of rolling ratio

[0045] According to the inner diameter d of the bearing ring blank b and the initial rolling current I 0 , the rolling ratio is calculated by the following formula.

[0046]

[0047] In the formula, k is the rolling ratio, d is b is the inner diameter of the ring blank (m), R 1 Main roller outer diameter (m), R 2 is the outer diameter of the core roller (m), I 0 is the initial current (A), σ is the elongation of the bearing ring blank, where σ is the value of the material with the largest proportion in the inner ring and outer ring.

[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] According to the rolling ratio, the cross-sectional area (A) of the bearing ring blank is determined by the following formula: b ):

[0052] A b = k × A f

[0053] Determine the outer diameter (D) of the bearing ring blank by the following formula b ):

[0054]

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

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

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

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

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

[0060] Therefore, the inner ring blank size: 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 Hb ; Outer ring blank size: inner diameter is the interface diameter R, outer diameter is the outer diameter D of the bearing ring blank b , height is the height H of the bearing ring blank b .

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

[0062] The contact surfaces of the inner and outer rings of the bearing rings are processed and polished. After the surface roughness of the contact surface is controlled within Ra0.8μm to Ra1.6μm, the contact surface is pretreated, including cleaning and degreasing, to remove surface oil, oxide layer and impurities, to ensure the cleanliness and flatness of the substrate surface, and then vacuum or protective atmosphere sealing welding is performed, and the weld depth is 15% to 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 the oxides generated at the interface of heterogeneous materials during the welding process.

[0063] 3. Bearing ring blank insulation pre-connection

[0064] The bearing ring blank after sealing and welding is kept warm in a vacuum furnace or a protective atmosphere furnace to promote interface atomic diffusion. The holding time is 0.5 to 2 hours and the holding temperature is 0.85-0.9T. m , where T m It is the melting point of the material with lower melting point between the inner ring and the outer ring.

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

[0066] like Figure 1 As shown, the electrically assisted rolling forming equipment is insulated, and then the positive and negative poles 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 pole contacts the main roller (1), and the lower conductive spring carbon brush (4) connected to the negative pole contacts the core roller (2), ensuring that the carbon brush does not affect the rotary feed motion of the roller;

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

[0068] For example, the forging temperature of aluminum bronze alloy is between 700 and 900°C, and the forging temperature of 42CrMo alloy steel is between 850 and 1200°C. The final forging temperature is 850 to 900°C.

[0069] A pulse current is applied by using a pulse power supply, the pulse current passes through the contact point between the main rolling roller and the bearing ring blank, and generates a current path 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 blank size and the pulse current;

[0071] When the rolling ratio reaches the set value, the main roller stops feeding and the current is immediately disconnected, 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 make the electromagnetic effect of the current have a higher skin depth to promote interface healing, the pulse current frequency f is 1 to 5 Hz.

[0074] (2) Pulse current size (I 0 )

[0075]

[0076] In the formula, I 0 is the pulse current size (A), H b is the height of the bearing ring blank (m), f is the pulse frequency (HZ), c p 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] Among them, the c p Take the value of the material with larger specific heat capacity in the inner ring and the outer ring, take the value of the material with larger density in the inner ring and the outer ring, take the value of ρ with larger resistivity in the inner ring and the outer ring, and take the value of σ with a larger proportion in the inner ring and the outer ring.

[0078] (3) Rolling feed speed (V 0 )

[0079]

[0080] Where V 0 Main roll feed speed (m / h), D b is the outer diameter of the bearing ring blank (m), d b is the inner diameter of the bearing ring blank (m), R 1 Main roller outer diameter (m), I 1 is the steady current (A) and I 1 (10~50)I 0 , I 0 is the pulse current size (A).

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

[0082] In this embodiment, the size of the wind power heterogeneous metal composite ring is 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 metal material of the outer ring is 42CrMo bearing steel, and the metal material of the inner ring is QAl10-4-4 aluminum bronze alloy.

[0084] The thickness of the aluminum bronze alloy accounts for 20%, then the interface diameter R = 2 + 0.2 (2.5-2) = 2.1m, the outer diameter of the main roll is 0.8m, and the outer diameter of the core roll is 0.3m. 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 size:

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

[0088] By formula The calculation shows that the rolling ratio k is about 1.6.

[0089] The cross-sectional area of ​​the ring is: Ring blank 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, height 0.5m; the dimensions of the outer ring of the ring blank are: inner diameter Φ2.1m, outer diameter Φ2.4m, height 0.5m.

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

[0093] The frequency f of the pulse current is set to 5HZ, and the formula Calculate the required pulse current I 0 About 550A;

[0094] By formula The feed speed V of the main roll is calculated 0 About 0.5mm / s.

[0095] 2. Pre-sealing welding of ring blanks

[0096] The inner and outer rings of the ring blank are machined according to the size, 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 pre-treated, including cleaning and degreasing, to remove oil stains, oxide layers and impurities on the surface to ensure the cleanliness and flatness of the substrate surface;

[0098] Then vacuum sealing is performed, and the sealing depth is 20% of the total wall thickness. After sealing, the bearing ring blank is obtained.

[0099] 3. Ring billet insulation pre-connection

[0100] The sealing and welding bearing ring blank is kept warm in a vacuum furnace for 1 hour at a temperature of 1000°C.

[0101] 4. Ring electrical assisted rolling forming

[0102] like Figure 1 As shown, the electrically assisted rolling forming equipment is insulated, and then the positive and negative poles 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 pole contacts the main roller (1), and the lower conductive spring carbon brush (4) connected to the negative pole contacts the core roller (2), ensuring that the carbon brush does not affect the rotational feeding movement of the roller;

[0103] The bearing ring blank is taken out after heat preservation and transferred to the hot rolling ring mill rolling station. The hot rolling temperature is 880℃.

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

[0105] Then the main roller is controlled to move at a feed rate of 0.5 mm / s; when the rolling ratio reaches the set value of 1.6, the main roller stops feeding and the current is immediately disconnected, completing the electrically assisted rolling forming process to obtain the bearing ring.

[0106] Comparative Example 1: A method for multi-field construction of heterogeneous materials for offshore wind turbine bearings

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

[0108] Comparative Example 2: A multi-field construction method for heterogeneous materials of offshore wind turbine bearings

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

[0110] Comparative Example 3: A multi-field construction method for heterogeneous materials of offshore wind turbine bearings

[0111] This comparative example provides a multi-field construction and forming method for heterogeneous materials of offshore wind power bearings, which is basically the same as Example 1, except that: this comparative example does not roll the bearing ring blank, that is, the main rolling roller 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 of offshore wind turbine bearings

[0113] This comparative example provides a multi-field construction and forming method of heterogeneous materials for offshore wind power bearings, which is basically the same as Example 1, except that: this comparative example does not apply a pulse current to the bearing ring blank, 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 tensile strength test at room temperature using a standard tensile test method. It was found that the tensile strength of the bearing rings prepared in Example 1 at the bonding interface reached 710 MPa, which was significantly higher than the tensile strength of the cast QAl10-4-4 copper alloy.

[0116] The tensile strength at the bonding interface of the bearing ring prepared in Comparative Example 1 reaches 255 MPa.

[0117] The tensile strength at the bonding interface of the bearing ring prepared in Comparative Example 2 reaches 630 MPa.

[0118] The tensile strength at the bonding interface of the bearing ring prepared in Comparative Example 3 reaches 397 MPa.

[0119] The tensile strength at the bonding interface of the bearing ring prepared in Comparative Example 4 reaches 562 MPa.

[0120] By comparing the results of Example 1 with those of Comparative Example 1, it is shown that not performing electrical assisted rolling forming on the bearing ring blank will lead to a decrease in the tensile strength at the bonding interface. The possible reason is that electrical assisted rolling forming accelerates the mutual diffusion of metal atoms at the heterogeneous interface. In the absence of electrical assisted rolling forming, although some atoms diffuse through the interface after heat preservation, the interface is still in a weak bonding state, and 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 with those of Comparative Example 2, it is shown that if the bearing ring blank is not kept warm before hot rolling, the tensile strength at the bonding interface will decrease. The possible reason is that proper heat preservation diffusion is not performed, and the atoms at the interface of the copper alloy and the alloy steel cannot form a metallurgical bond through thermally activated 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 with those of Comparative Example 3, it is shown that not applying hot rolling will lead to a decrease in the tensile strength at the bonding interface. The possible reason is that the sealing welding only achieves physical bonding, and the high-temperature plastic deformation of hot rolling is not used to promote the interface morphology to fit, the mechanical interlocking degree is poor, there are still hole defects in the interface, the interface bonding is weak, and the material has not been forged and the deformation performance is not optimized;

[0123] By comparing the results of Example 1 with those of Comparative Example 4, it is shown that the absence of pulse current during hot rolling will lead to a decrease in the tensile strength at the bonding interface. The possible reason is that the pulse current can reduce the rheological stress of the material through the electroplastic effect and promote dislocation movement and atomic diffusion. In the absence of current auxiliary effect, the atomic diffusion rate of the heterogeneous interface decreases, and a longer time or a larger deformation rolling is required to achieve the same bonding strength. However, large deformation and long-term high temperature state can easily cause abnormal growth of grains, reducing the strength and toughness of the material.

[0124] This shows that the multi-field construction forming method of heterogeneous materials for wind turbine bearings proposed in the present invention can obtain a high-strength metallurgical bonding interface, and the constructed copper alloy surface 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 in the protection scope of the present invention.

Claims

1. A method for multi-field construction of heterogeneous materials for offshore wind turbine bearings, characterized in that: The contact surfaces of the inner ring and the outer ring of an offshore wind power bearing are sealed and welded to obtain a bearing ring blank, the bearing ring blank is hot rolled, and a pulse current is synchronously applied during the hot rolling process to obtain a bearing ring component, wherein the inner ring and the outer ring are made of two different materials.

2. The offshore wind turbine bearing heterogeneous material multi-field construction forming method according to claim 1 is characterized in that: The magnitude of the pulse current is Where I0 is the pulse current, H b is the height of the bearing ring blank, f is the frequency of the pulse current, c p is the specific heat capacity of the bearing ring blank, d is the density of the bearing ring blank, ρ is the resistivity of the bearing ring blank, σ is the elongation of the bearing ring blank, Among them, the c p Take the value of the material with larger specific heat capacity in the inner ring and the outer ring, take the value of the material with larger density in the inner ring and the outer ring, take the value of ρ with larger resistivity in the inner ring and the outer ring, and take the value of σ with a larger proportion in the inner ring and the outer ring.

3. The offshore wind turbine bearing heterogeneous material multi-field construction forming method according to claim 1 is characterized in that: During the hot rolling process, the main roller feed speed is Where V0 is the main roll feed speed, D b is the outer diameter of the bearing ring blank, d b is the inner diameter of the bearing ring blank, R1 is the outer diameter of the main rolling roller, I1 is the stable current and I1 is (10~50)I0, I0 is the size of the pulse current.

4. The offshore wind turbine bearing heterogeneous material multi-field construction forming method according to claim 1 is characterized in that: During the hot rolling process, the rolling ratio is In the formula, k is the rolling ratio, d is b is the inner diameter of the bearing ring blank, R1 is the outer diameter of the main rolling roller, R2 is the outer diameter of the core roller, I0 is the magnitude of the pulse current, and σ is the elongation of the bearing ring blank, wherein σ is the elongation of the material that accounts for a larger proportion of the inner ring and the outer ring.

5. The offshore wind turbine bearing heterogeneous material multi-field construction forming method according to claim 1 is characterized in that: After the bearing ring blank is obtained by sealing and welding, the bearing ring blank is kept warm, and then the bearing ring blank is hot rolled. The keeping warm is carried out in a vacuum furnace or a protective atmosphere furnace, and the keeping warm temperature is 0.85-0.9T m , the T m is the melting point of the material with the lower melting point in the inner ring and the outer ring, and the insulation time is 0.5 to 2 hours.

6. The offshore wind turbine bearing heterogeneous material multi-field construction forming method according to claim 1 is 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 =0.6~0.8d 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 is the cross-sectional area of ​​the bearing ring blank, D b is the outer diameter of the bearing ring blank, d b is the inner diameter of the bearing ring blank, d f is the inner diameter of the bearing ring, H f is the height of the bearing ring, H b is the height of the bearing ring blank.

7. The offshore wind turbine bearing heterogeneous material multi-field construction forming method according to claim 1 is characterized in that: The weld depth of the sealing welding is 15-35% of the total wall thickness.

8. The offshore wind turbine bearing heterogeneous material multi-field construction forming method according to claim 1 is characterized in that: The hot rolling temperature is an intersection range of the forging temperatures of the inner ring and the outer ring.

9. A bearing ring produced by the offshore wind power bearing heterogeneous material multi-field construction forming method as described in any one of claims 1 to 8.

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