Manufacturing method of bridge support and bridge support

Abstract

The invention relates to the technical field of bridge construction, particularly provides a manufacturing method of a bridge support and the bridge support, and aims to solve the problem that the consistency of the thickness of a stainless steel cladding layer is difficult to ensure when a cladding alloy layer is prepared on a curved surface. To this end, the bridge support of the present invention comprises: an upper base comprising a first contact surface; a lower base including a second contact surface; the spherical crown is arranged between the first contact surface and the second contact surface and comprises a lower contact surface close to the second contact surface; the manufacturing method comprises the following steps: pre-treating the first contact surface and the lower contact surface to obtain a pre-treated matching surface; enabling the laser and the alloy wire to synchronously act on the pretreatment matching surface; and enabling the laser and the pretreated matching surface to move relatively so as to form a cladding alloy layer on the pretreated matching surface. Based on the scheme, in the manufacturing process of the bridge support, the consistency of the thickness of the cladding alloy layer of the bridge support is good.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a manufacturing method of a bridge support and the bridge support. Background Art

[0002] Bridge bearings currently play a crucial role in bridges and buildings, supporting the loads of the superstructure and sensitively transmitting the loads and deformations of the superstructure to the substructure. Bridge bearings typically consist of an upper base connected to the superstructure, a lower base connected to the substructure, and a spherical cap positioned between the upper and lower bases. Sliding surfaces exist between the upper and lower bases, and between the upper and lower bases. To reduce resistance, these sliding surfaces typically utilize a combination of wear-resistant sliding plates and stainless steel plates.

[0003] A Chinese patent document (Announcement No.: CN116043213A) discloses a process for laser-cladding stainless steel bridge bearing plates. This process involves applying a laser powder melting process to a substrate surface to form a stainless steel cladding layer. However, this technique can cause splashing and scattering during the powder spraying process, resulting in powder loss. This affects the consistency of the stainless steel cladding layer, especially when applying the cladding layer on a curved surface.

[0004] Accordingly, this field requires a new technical solution to solve the above problems. Summary of the Invention

[0005] In order to solve the above problem, that is, to solve the problem that it is difficult to ensure the consistency of the thickness of the stainless steel cladding layer when preparing the stainless steel cladding layer on the curved surface.

[0006] In a first aspect, the present invention provides a method for manufacturing a bridge bearing, wherein the bridge bearing comprises: an upper base comprising a first contact surface; a lower base comprising a second contact surface; a spherical cap disposed between the first contact surface and the second contact surface, the spherical cap comprising an upper contact surface close to the first contact surface and a lower contact surface close to the second contact surface; the first contact surface, the second contact surface, the upper contact surface and the lower contact surface are all curved surfaces; the manufacturing method comprises: pre-treating at least one of the first contact surface, the second contact surface, the upper contact surface and the lower contact surface to obtain a pre-treated mating surface; causing a laser and an alloy wire to act synchronously on the pre-treated mating surface; causing the laser and the pre-treated mating surface to move relative to each other to form a cladding alloy layer on the pre-treated mating surface.

[0007] In some embodiments, the step of "pre-treating at least one of the first contact surface, the second contact surface, the upper contact surface and the lower contact surface to obtain a pre-treated mating surface" further includes: pre-treating the first contact surface and the lower contact surface to obtain a pre-treated mating surface; or pre-treating the second contact surface and the upper contact surface to obtain a pre-treated mating surface; or pre-treating the first contact surface and the second contact surface to obtain a pre-treated mating surface; or pre-treating the upper contact surface and the lower contact surface to obtain a pre-treated mating surface.

[0008] In some embodiments, the step of "moving the laser relative to the pre-treated mating surface to form a cladding layer on the pre-treated mating surface" further includes: moving the laser relative to the pre-treated mating surface to form a melt path on the pre-treated mating surface, and making multiple melt paths cover the pre-treated mating surface to form the cladding layer on the pre-treated mating surface.

[0009] In some embodiments, the overlap width between adjacent melt tracks ranges from 5.0 mm to 5.5 mm.

[0010] In some embodiments, the thickness of the cladding layer ranges from 0.5 mm to 3 mm; and / or the cladding alloy layer includes 1 to 10 cladding layers.

[0011] In some embodiments, the alloy wire comprises the following components in percentage by mass: carbon 0.01% to 0.06%, silicon 1.00% to 3.00%, manganese 1.00% to 4.00%, phosphorus 0.01% to 0.1%, sulfur 0.01% to 0.1%, nickel 5.00% to 20.00%, chromium 10.00% to 20.00%, molybdenum 0.50% to 4.00%, and the balance is iron.

[0012] In some embodiments, the diameter of the alloy wire ranges from 0.5 mm to 4.0 mm.

[0013] In some embodiments, the power of the laser is in the range of 2000W to 3800W; and / or the distance between the alloy wire and the pretreated mating surface is in the range of 8mm to 15mm; and / or the wire feeding speed of the alloy wire is in the range of 20mm / s to 40mm / s; and / or the scanning speed of the laser relative to the pretreated mating surface is in the range of 5mm / s to 15mm / s.

[0014] In some embodiments, after forming the cladding alloy layer, the manufacturing method further includes: polishing the cladding alloy layer; and / or, the step of "pre-treating the first contact surface and the lower contact surface" further includes: grinding the first contact surface and the lower contact surface so that the roughness of the first contact surface and the lower contact surface is less than or equal to a roughness threshold; cleaning the ground first contact surface and the lower contact surface; and / or, before allowing the laser and the alloy wire to act synchronously on the pre-treated mating surface, the manufacturing method further includes: straightening the alloy wire.

[0015] In the second aspect, the present invention provides a bridge bearing, which includes: an upper base, which includes a first contact surface; a lower base, which includes a second contact surface; a spherical cap, which is arranged between the first contact surface and the second contact surface, and the spherical cap includes a lower contact surface close to the second contact surface; the first contact surface and the lower contact surface are curved surfaces, and the first contact surface and the lower contact surface are provided with a cladding alloy layer formed by the above-mentioned bridge bearing manufacturing method.

[0016] When the above-mentioned technical solution is adopted, the manufacturing method and bridge bearing provided by the present invention utilize a laser melting process to feed alloy wire into a laser. The laser melts the alloy wire to form a molten pool. As the laser and the pre-treated mating surface move relative to each other, a cladding alloy layer is formed on the pre-treated mating surface. During the preparation of the cladding alloy layer of the bridge bearing, the rigid alloy wire is directly delivered to the pre-treated mating surface. The cladding process does not cause alloy dust splashing, displacement, or scattering as in related technologies, which helps improve the utilization rate of raw materials and ensure the consistency of the thickness of the cladding alloy layer. In addition, the alloy wire is preheated to a semi-molten state, which allows it to quickly melt at the pre-treated mating surface to form a molten pool, thereby improving the cladding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application is described below with reference to the accompanying drawings.

[0018] Figure 1 It is a flowchart of the steps of the manufacturing method of the bridge bearing provided by the present invention;

[0019] Figure 2 It is a schematic diagram of the overlap width of two adjacent melt paths;

[0020] Figure 3 It is a structural schematic diagram of the bridge support provided by the present invention. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the detailed steps of the method of the present application are described in detail below, those skilled in the art can combine, split and change the order of the following steps without departing from the basic principles of the present application. The modified technical solution does not change the basic concept of the present application and therefore falls within the scope of protection of the present application.

[0022] It should be noted that, in the description of this application, the terms "first", "second", "third", "fourth", "fifth", etc. are only used to distinguish similar objects and cannot be understood as indicating or implying a specific order or relative importance.

[0023] Unless otherwise stated, the term "plurality" means two or more.

[0024] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0025] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, "A and / or B" means: A or B, or, A and B.

[0026] Related technologies use a laser powder melting process to create a stainless steel cladding layer on the surface of a substrate. This involves using a laser to melt alloy powder onto the substrate surface, forming a stainless steel cladding layer. The powder melting process requires spraying alloy powder through a channel onto the substrate surface. During this spraying process, due to the characteristics of the alloy powder, there is a tendency for splashing. Furthermore, when the alloy powder hits the surface of the substrate, it sputters, causing alloy powder loss. This is especially true when the laser powder melting process is applied to curved surfaces, making it difficult to ensure a consistent thickness of the stainless steel cladding layer.

[0027] In a first aspect, the present application provides a method for manufacturing a bridge bearing.

[0028] Combine Figure 3 As shown, the bridge bearing includes an upper base 3, a lower base 4, and a spherical cap 5. The upper base 3 includes a first contact surface. The lower base 4 includes a second contact surface. The spherical cap 5 is disposed between the first and second contact surfaces and includes an upper contact surface proximate the first contact surface and a lower contact surface proximate the second contact surface. The first, second, upper, and lower contact surfaces are all curved.

[0029] Combine Figure 1 As shown, the manufacturing method of the bridge bearing provided in this application includes:

[0030] S101 , pre-processing at least one of the first contact surface, the second contact surface, the upper contact surface, and the lower contact surface to obtain a pre-processed mating surface.

[0031] S102, making the laser and the alloy wire act on the pre-treated mating surface synchronously.

[0032] S103, moving the laser and the pre-treated mating surface relative to each other to form a cladding alloy layer on the pre-treated mating surface.

[0033] In the case of adopting the above-mentioned technical solution, the manufacturing method of the bridge bearing provided by the present invention uses a laser melting process to feed alloy wire into the laser. The laser melts the alloy wire to form a molten pool. As the laser and the pre-treated mating surface move relative to each other, a cladding alloy layer is formed on the pre-treated mating surface. During the preparation of the cladding alloy layer, the rigid alloy wire is directly delivered to the pre-treated mating surface. The cladding process does not cause alloy dust splashing, displacement, and scattering as in related technologies, which helps to improve the utilization rate of raw materials and ensure the consistency of the thickness of the cladding alloy layer. In addition, the alloy wire is preheated to a semi-molten state, which can quickly melt to form a molten pool at the pre-treated mating surface, thereby improving the cladding efficiency. The rigid alloy wire is directly delivered to the pre-treated mating surface, avoiding the loss of raw materials. Experimental comparison shows that the utilization rate of alloy powder is approximately 85%, while the utilization rate of alloy wire is greater than or equal to 95%. This application can reduce the amount of raw materials used by 10%, which is beneficial for cost savings.

[0034] In addition, the powder melting process requires preheating the powder before use to achieve the purpose of improving utilization and enhancing the stability of the cladding layer. However, the wire fusion process can simultaneously complete the pretreatment of the alloy wire as the wire passes through the wire feed channel. Once the alloy wire approaches the pretreated mating surface, it can quickly melt to form a molten pool, which can increase the cladding efficiency by about 10%. The alloy wire does not splash like powder during use, so the laser power during the wire fusion process is lower than that during the powder fusion process, resulting in less heat input during the cladding process and reduced workpiece deformation. Compared with the powder fusion process, the wire fusion technology can reduce the deformation of the pretreated mating surface by 30% for the same size cladding layer. The alloy wire has a lower impurity content, the cladding layer is denser, and the defect rate is lower. The defect rate reduces the powder fusion process by about 20%.

[0035] In some embodiments, the step of "pre-treating at least one of the first contact surface, the second contact surface, the upper contact surface, and the lower contact surface to obtain a pre-treated mating surface" further includes: pre-treating the first contact surface and the lower contact surface to obtain a pre-treated mating surface; or pre-treating the second contact surface and the upper contact surface to obtain a pre-treated mating surface; or pre-treating the first contact surface and the second contact surface to obtain a pre-treated mating surface; or pre-treating the upper contact surface and the lower contact surface to obtain a pre-treated mating surface. This ensures that a cladding alloy layer is formed on one of the two sliding surfaces, and the other is provided with a wear-resistant plate. The cladding alloy layer and the wear-resistant plate cooperate to reduce the resistance of the sliding surface.

[0036] It can be understood that the first contact surface and the lower contact surface are pretreated to obtain pretreated mating surfaces, and cladding alloy layers are formed on the first contact surface and the lower contact surface respectively, and the second contact surface and the upper contact surface are respectively provided with wear-resistant slides; or the second contact surface and the upper contact surface are pretreated to obtain pretreated mating surfaces, and cladding alloy layers are formed on the second contact surface and the upper contact surface respectively, and the first contact surface and the lower contact surface are respectively provided with wear-resistant slides; or the first contact surface and the second contact surface are pretreated to obtain pretreated mating surfaces, and cladding alloy layers are formed on the first contact surface and the second contact surface respectively, and the upper contact surface and the lower contact surface are respectively provided with wear-resistant slides; or the upper contact surface and the lower contact surface are pretreated to obtain pretreated mating surfaces, and cladding alloy layers are formed on the upper contact surface and the lower contact surface respectively, and the first contact surface and the second contact surface are respectively provided with wear-resistant slides.

[0037] In some embodiments, the step of "pre-treating the first contact surface and the lower contact surface" further includes polishing the first contact surface and the lower contact surface to a roughness less than or equal to a roughness threshold. The polished first contact surface and the lower contact surface are cleaned. The pre-treated first contact surface and the lower contact surface serve as pre-treated mating surfaces, thereby enhancing the fit between the pre-treated mating surfaces and the cladding alloy layer.

[0038] Optionally, the step of "polishing the first contact surface and the lower contact surface" further includes machining the first contact surface and the lower contact surface. Shot blasting the machined first contact surface and the lower contact surface is performed. In this way, the roughness of the first contact surface and the lower contact surface can meet the required level.

[0039] For example, the first contact surface and the lower contact surface are machined according to the requirements of the relevant drawings, so that the surface roughness of the first contact surface and the lower contact surface is less than or equal to 12.5μm. The machined first contact surface and the lower contact surface are shot blasted, so that the roughness of the first contact surface and the lower contact surface after shot blasting reaches Rz20μm to 80μm.

[0040] Optionally, the step of "cleaning the polished first contact surface and the lower contact surface" further includes wiping the polished first contact surface and the lower contact surface with an organic solvent, so as to remove impurities such as dust and oil on the first contact surface and the lower contact surface.

[0041] Optionally, the organic solvent includes alcohol or acetone.

[0042] In some embodiments, the step of "moving the laser relative to the pretreated mating surface to form a cladding alloy layer on the pretreated mating surface" further includes moving the laser relative to the pretreated mating surface to form a cladding layer on the pretreated mating surface. The cladding alloy layer may be formed by stacking the cladding layers. A cladding alloy layer of a desired thickness may be formed on the pretreated mating surface.

[0043] For example, the cladding alloy layer includes three cladding layers. First, a first cladding layer is prepared on the pretreated mating surface. Then, a second cladding layer is prepared on the first cladding layer. Then, a third cladding layer is prepared on the second cladding layer.

[0044] In some embodiments, the step of "moving the laser relative to the pretreated mating surface to form a cladding layer on the pretreated mating surface" further includes moving the laser relative to the pretreated mating surface to form a melt path on the pretreated mating surface, whereby multiple melt paths cover the pretreated mating surface to form a cladding layer on the pretreated mating surface. Multiple melt paths cover the pretreated mating surface to form a single cladding layer, and a cladding layer is superimposed on the cladding layer to form a cladding alloy layer of a desired thickness.

[0045] For example, the cladding alloy layer includes three cladding layers. First, a melt channel is formed on the pretreated mating surface, so that multiple melt channels cover the pretreated mating surface to form a first cladding layer on the pretreated mating surface; then, a melt channel is formed on the first cladding layer, so that multiple melt channels cover the first cladding layer to form a second cladding layer on the first cladding layer; then, a melt channel is formed on the second cladding layer, so that multiple melt channels cover the second cladding layer to form a third cladding layer on the second cladding layer.

[0046] In some embodiments, the overlap width between adjacent melt tracks ranges from 5.0 mm to 5.5 mm. For example, the overlap width between adjacent melt tracks can be 5.0 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, or 5.5 mm. This configuration ensures that the profile of the cladding layer is within a range of 0.10 to 0.15. If the overlap width is too large, the cladding layer will be too thick and the amount of raw materials used will increase. If the overlap width is too small, the height difference between the melt tracks will be large, affecting the overall profile.

[0047] Among them, contour refers to the change of the actual contour being measured relative to the ideal contour.

[0048] The overlap width is the width of the overlap between two adjacent melt paths. Figure 2 As shown, along the extending direction of the melt track, the first melt track 1 and the second melt track 2 partially overlap, and the width a of the overlapping portion is the overlap width.

[0049] In some embodiments, the thickness of the cladding layer ranges from 0.5 mm to 3 mm.

[0050] For example, the thickness of the cladding layer may be 0.5 mm, 0.8 mm, 1.0 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.5 mm, 2.8 mm or 3.0 mm.

[0051] In some embodiments, the cladding alloy layer includes 1 to 10 cladding layers. For example, the cladding alloy layer includes 1, 2, 3, 5, 6, 8, or 10 cladding layers. The number of cladding layers included in the cladding alloy layer can be flexibly set according to needs.

[0052] In some embodiments, the alloy wire includes the following components in mass percentage: carbon (C) 0.01% to 0.06%, silicon (Si) 1.00% to 3.00%, manganese (Mn) 1.00% to 4.00%, phosphorus (P) 0.01% to 0.1%, sulfur (S) 0.01% to 0.1%, nickel (Ni) 5.00% to 20.00%, chromium (Cr) 10.00% to 20.00%, molybdenum (Mo) 0.50% to 4.00%, and the balance is iron (Fe).

[0053] Cr in the alloy wire plays a very important role. Cr can form a passivation film, improving the wear resistance and corrosion resistance of the surface of the cladding alloy layer. The Cr content is preferably above 12%. Fe, as a basic element, provides the main structure and strength for the cladding alloy layer. C can increase the strength of the cladding alloy layer. If too much C is added, it will affect the corrosion resistance of the cladding alloy layer. Therefore, the C content generally does not exceed 0.06%. Si and Mn can improve the strength of the cladding alloy layer. P can increase the hardness of the cladding alloy layer, but too high a P content will reduce the plasticity of the cladding layer. Therefore, the P content does not exceed 0.1%. S can improve the machinability of the cladding alloy layer, but it will increase cold brittleness during cladding, so the content does not exceed 0.1%. Ni is an important element for forming an austenitic microstructure and can improve the plasticity and toughness of the cladding alloy layer. Mo can improve the corrosion resistance and high-temperature strength of the cladding alloy layer. By limiting the composition of the alloy wire to the above percentages, a cladding alloy layer with excellent wear resistance and corrosion resistance can be formed.

[0054] For example, the alloy wire includes the following components in the following mass percentages: C: 0.05%, Si: 2.80%, Mn: 3.00%, P: 0.08%, S: 0.08%, Ni: 15.00%, Cr: 15.00%, Mo: 3.00%, and Fe: 60.99%.

[0055] For example, the alloy wire includes the following components in the following mass percentages: C: 0.03%, Si: 2.00%, Mn: 3.50%, P: 0.07%, S: 0.08%, Ni: 10.00%, Cr: 13.00%, Mo: 4.00%, and Fe: 67.32%.

[0056] In some embodiments, the diameter of the alloy wire ranges from 0.5 mm to 4.0 mm. For example, the diameter of the alloy wire ranges from 0.5 mm, 0.8 mm, 1.2 mm, 2.0 mm, 2.5 mm, 2.6 mm, 3.0 mm, 3.6 mm, or 4.0 mm. Using alloy wires of different diameters with corresponding wire feed ratios (ratio of wire feed speed to scanning speed) can achieve single-layer cladding with different thicknesses. For example, using an alloy wire with a diameter of 1.0 mm and a wire feed ratio of 1.25 can achieve a single-layer cladding with a thickness of 0.8 mm.

[0057] In some embodiments, the laser power ranges from 2000W to 3800W. For example, the laser power ranges from 2000W, 2200W, 2500W, 2700W, 3000W, 3600W, or 3800W. If the laser power is too low, the alloy wire may not melt in time, resulting in ripples on the surface of the melt channel. If the laser power is too high, the alloy wire may completely melt before contacting the pre-treated mating surface, dripping onto the melt channel, resulting in an uneven melt channel.

[0058] In some embodiments, the distance between the alloy wire and the pre-treated mating surface ranges from 8 mm to 15 mm. For example, the distance between the alloy wire and the pre-treated mating surface ranges from 8 mm, 10 mm, 11 mm, 12 mm, 13 mm, or 15 mm. If the distance between the alloy wire and the pre-treated mating surface is too low, the alloy wire may not be fully melted. If the distance between the alloy wire and the pre-treated mating surface is too high, the alloy wire may be completely melted before it contacts the pre-treated mating surface, forming water droplets that fall on the curved mating surface, thereby resulting in an uneven melt path. By limiting the distance between the alloy wire and the pre-treated mating surface to the above range, it is beneficial to obtain a uniform, continuous, and smooth melt path.

[0059] In some embodiments, the wire feeding speed of the alloy wire is in the range of 20 mm / s to 40 mm / s. For example, the wire feeding speed of the alloy wire is 20 mm / s, 25 mm / s, 30 mm / s, 35 mm / s or 40 mm / s, etc. This is beneficial to improving the stability of the cladding and ensuring the quality of the cladding alloy layer. If the wire feeding speed is too fast, the alloy wire will not melt in time, and the alloy wire will touch the pre-treated mating surface, affecting the stability of the cladding and causing obvious ripples in the melt path. When the wire feeding speed is too slow, the alloy wire will melt rapidly under the laser, and the alloy wire will drip onto the pre-treated mating surface in the shape of water droplets, resulting in an uneven melt path. By limiting the wire feeding speed of the alloy wire to the above range, it is beneficial to obtain a uniform, continuous and smooth melt path.

[0060] In some embodiments, the laser scanning speed relative to the pretreated mating surface ranges from 5 mm / s to 15 mm / s. For example, the laser scanning speed relative to the pretreated mating surface ranges from 5 mm / s, 8 mm / s, 9 mm / s, 10 mm / s, or 15 mm / s. The scanning speed significantly affects the thickness of the melt channel. The faster the speed, the lower the melt channel thickness per unit time. Furthermore, as the scanning speed increases, the hardness of the resulting cladding layer also slightly increases. Limiting the scanning speed to the aforementioned range facilitates obtaining a uniform, continuous melt channel with a smooth surface.

[0061] In some embodiments, after forming the cladding alloy layer, the manufacturing method further comprises: polishing the cladding alloy layer, so that the surface of the cladding alloy layer can be polished to the roughness and profile required by the technology.

[0062] Before the laser and the alloy wire are simultaneously applied to the pre-treated mating surface, the manufacturing method further includes straightening the alloy wire, so that the alloy wire meets the requirements of use and the quality of the cladding alloy layer is guaranteed.

[0063] Optionally, the cladding path is a straight line or a spiral line.

[0064] Optionally, the cladding path is a straight line. When the pre-treated mating surface is a convex spherical surface, the laser power of a single melt path first increases and then decreases, the wire feed rate of the alloy wire first increases and then decreases, and the relative distance between the alloy wire and the convex spherical surface remains unchanged. When the pre-treated mating surface is a concave spherical surface, the laser power of a single melt path first decreases and then increases, the wire feed rate of the alloy wire first decreases and then increases, and the relative distance between the alloy wire and the convex spherical surface remains unchanged.

[0065] Optionally, the cladding path is a spiral line, with the cladding performed in a spiral from the center of the pre-treated mating surface toward the edge. For example, if the pre-treated mating surface is a convex spherical surface with a radius of 600 mm, the laser head needs to be lowered at a rate of 0.208 mm / min during the cladding process; the laser is preset to be vertical and tilted at a rate of 0.01° / min during the cladding process to maintain perpendicularity to the convex spherical surface; the laser power is gradually increased from 2000 W to 3800 W; the wire feed rate is preset to 1.5 g / min, and starting from the second pass, the wire feed rate of the nth pass is increased by a ratio of n / (n-1) compared to the previous pass. For example, the wire feed rate of the fourth pass is 1.33 times that of the third pass.

[0066] In a second aspect, the present application provides a bridge bearing.

[0067] Combine Figure 3 As shown, the bridge bearing provided in this application includes an upper base 3, a lower base 4, and a spherical cap 5. The upper base 3 includes a first contact surface. The lower base 4 includes a second contact surface. The spherical cap 5 is disposed between the first and second contact surfaces and includes a lower contact surface adjacent to the second contact surface. The first and lower contact surfaces are curved surfaces and are provided with a cladding alloy layer formed using the bridge bearing manufacturing method described above.

[0068] For example, combined with Figure 3 As shown, a first cladding alloy layer 6 is formed on the first contact surface, and a second cladding alloy layer 7 is formed on the lower contact surface.

[0069] In the bridge bearing provided by the present invention, employing the above-described technical solution, an alloy wire is fed into a laser beam through a laser beam. The laser beam melts the alloy wire to form a molten pool. As the laser beam and the pretreated mating surface move relative to each other, a cladding alloy layer is formed on the pretreated mating surface. During the preparation of the cladding alloy layer, the rigid alloy wire is directly fed to the pretreated mating surface. This eliminates the splashing, displacement, and scattering of alloy dust that occurs in related art processes. This improves raw material utilization, ensures the consistency of the cladding alloy layer thickness, and ultimately, guarantees the quality of the bridge bearing.

[0070] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims of this application, any of the claimed embodiments may be used in any combination.

[0071] Thus far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A method for manufacturing a bridge bearing, characterized in that: The bridge support comprises: an upper base including a first contact surface; a lower base including a second contact surface; a spherical cap, which is arranged between the first contact surface and the second contact surface, the spherical cap comprising an upper contact surface close to the first contact surface and a lower contact surface close to the second contact surface; the first contact surface, the second contact surface, the upper contact surface and the lower contact surface are all curved surfaces; The manufacturing method comprises: Preprocessing at least one of the first contact surface, the second contact surface, the upper contact surface, and the lower contact surface to obtain a preprocessed mating surface; Allowing the laser and the alloy wire to act on the pre-treated mating surface synchronously; The laser and the pre-processed mating surface are moved relative to each other to form a cladding alloy layer on the pre-processed mating surface.

2. The manufacturing method according to claim 1, characterized in that: The step of "pre-treating at least one of the first contact surface, the second contact surface, the upper contact surface and the lower contact surface to obtain a pre-treated mating surface" further includes: Pre-processing the first contact surface and the lower contact surface to obtain a pre-processed mating surface; or Pre-processing the second contact surface and the upper contact surface to obtain a pre-processed mating surface; or Pre-processing the first contact surface and the second contact surface to obtain a pre-processed mating surface; or The upper contact surface and the lower contact surface are pre-processed to obtain pre-processed matching surfaces.

3. The manufacturing method according to claim 1, characterized in that: The step of "moving the laser relative to the pre-treated mating surface to form a cladding alloy layer on the pre-treated mating surface" further includes: The laser and the pre-treated mating surface are moved relative to each other to form a cladding layer on the pre-treated mating surface; wherein one or more layers of the cladding layer constitute the cladding alloy layer.

4. The manufacturing method according to claim 3, characterized in that: The step of "moving the laser relative to the pre-treated mating surface to form a cladding layer on the pre-treated mating surface" further includes: The laser and the pre-processed mating surface are moved relative to each other to form a melt path on the pre-processed mating surface, and a plurality of the melt paths cover the pre-processed mating surface to form the cladding layer on the pre-processed mating surface.

5. The manufacturing method according to claim 4, characterized in that: The overlap width between adjacent melt tracks ranges from 5.0 mm to 5.5 mm.

6. The manufacturing method according to claim 3, characterized in that: The thickness of the cladding layer ranges from 0.5 mm to 3 mm; and / or the cladding alloy layer includes 1 to 10 cladding layers.

7. The manufacturing method according to any one of claims 1 to 6, characterized in that: The alloy wire comprises the following components in percentage by mass: 0.01% to 0.06% carbon, 1.00% to 3.00% silicon, 1.00% to 4.00% manganese, 0.01% to 0.1% phosphorus, 0.01% to 0.1% sulfur, 5.00% to 20.00% nickel, 10.00% to 20.00% chromium, 0.50% to 4.00% molybdenum, and the balance is iron.

8. The manufacturing method according to any one of claims 1 to 6, characterized in that: The diameter of the alloy wire is in the range of 0.5 mm to 4.0 mm; and / or, The power of the laser is in the range of 2000W to 3800W; and / or, The distance between the alloy wire and the pre-treated mating surface ranges from 8 mm to 15 mm; and / or, The wire feeding speed of the alloy wire is in the range of 20 mm / s to 40 mm / s; and / or, The scanning speed of the laser relative to the pre-treated matching surface ranges from 5 mm / s to 15 mm / s.

9. The manufacturing method according to any one of claims 1 to 6, characterized in that: After forming the cladding alloy layer, the manufacturing method further comprises: polishing the cladding alloy layer; and / or, The step of "pre-treating the first contact surface and the lower contact surface" further includes: grinding the first contact surface and the lower contact surface so that the roughness of the first contact surface and the lower contact surface is less than or equal to the roughness threshold; cleaning the first contact surface and the lower contact surface after grinding; and / or, Before causing the laser and the alloy wire to act on the pre-treated mating surface synchronously, the manufacturing method further includes: straightening the alloy wire.

10. A bridge bearing, characterized in that: The bridge support comprises: an upper base including a first contact surface; a lower base including a second contact surface; A spherical cap is arranged between the first contact surface and the second contact surface, and the spherical cap includes a lower contact surface close to the second contact surface; the first contact surface and the lower contact surface are curved surfaces, and the first contact surface and the lower contact surface are provided with a cladding alloy layer formed by the manufacturing method of the bridge bearing described in any one of claims 1 to 9.

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