Oil film bearing suitable for the side of a high speed rolling mill roll ring

Abstract

The utility model discloses an oil film bearing suitable for the side of high speed rolling mill roll ring belongs to the technical field of bearing for rolling mill equipment, including the bearing body for the interference fit with the bearing seat inner hole, and the bearing body is the seamless round ring of the multilayer composite structure composition, and from the outer circle to the inner hole is steel back layer, copper alloy layer, bonding layer, wear -resistant plating layer and tin surface layer in proper order, and the oil inlet hole that passes through inside and outside is radially established on the lateral wall of bearing body, and the bearing body inner wall of non - bearing area is equipped with the diffusion oil tank of the oil inlet hole intercommunication. Adopt seamless round ring bearing body of integral type can give consideration to high -strength support, excellent heat conductivity, good wear resistance and excellent surface compliance (running -in), also is favorable to the quick establishment and the maintenance lubricating oil film. The utility model can make its average service life from 15 days or so improve to above three months, has improved rolling mill operation rate and economy greatly.

Description

Technical Field

[0001] This utility model belongs to the technical field of bearings for rolling mill equipment, and specifically relates to an oil film bearing suitable for the side of the roll ring of a high-speed rolling mill. Background Technology

[0002] In the roll box of high-speed rolling mills (such as pre-finishing and finishing mills), the oil film bearing on the roll ring side is a key component, and its performance directly affects the rolling mill's operational stability, rolling accuracy, and maintenance costs. In traditional designs, the oil film bearing in this position is often in the form of a "half-shell" (i.e., composed of two or more bearing shells) to meet installation requirements.

[0003] With the continuous increase in rolling speed (e.g., from 60m / s to 120m / s or even higher), traditional semi-mast oil film bearings exhibit the following defects: 1) Under high-speed impact and alternating loads, the mating surface of the spliced ​​structure is prone to fretting wear and stress concentration, leading to fatigue cracks; 2) The overall stiffness is relatively low, affecting the dynamic stability of the roll system; 3) The lubricating oil film is prone to interruption or disturbance at the joint, affecting the continuity of pressure distribution, thereby reducing load-bearing capacity and lubrication effect. These factors collectively lead to a sharp reduction in bearing life. Under high-speed conditions, the average service life may drop to about 15 days, causing frequent downtime for replacement, seriously affecting production efficiency and economic benefits.

[0004] Therefore, there is an urgent need for a roll ring side oil film bearing structure that can adapt to the working conditions of modern high-speed rolling mills, has a longer service life, and higher operational stability. Utility Model Content

[0005] This invention provides an oil film bearing suitable for the roll ring side of a high-speed rolling mill, aiming to solve the problems of short service life and poor stability of existing semi-shield oil film bearings on high-speed rolling mills.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An oil film bearing suitable for the side of a high-speed rolling mill roll ring includes a bearing body for interference fit with the inner hole of the bearing housing. The bearing body is an integral seamless ring composed of a multi-layer composite structure, consisting of a steel backing layer, a copper alloy layer, an adhesive layer, a wear-resistant plating layer, and a tin surface layer, arranged sequentially from the outer circle to the inner hole. The side wall of the bearing body is provided with an oil inlet hole that penetrates both the inside and outside. The inner wall of the non-load-bearing area of ​​the bearing body is provided with a diffusion oil groove that connects to the oil inlet hole.

[0007] Furthermore, the copper alloy layer is CuPb with a hardness of 55-75 HB. 24 Sn4, the copper alloy layer and the steel backing layer are centrifugally cast together.

[0008] Furthermore, the thickness of the copper alloy layer is 0.4 to 1.2 mm, and the thickness difference of the copper alloy layer along the same generatrix on the bearing body is no greater than 0.25 mm.

[0009] Furthermore, the adhesive layer is a nickel gate layer with a thickness of 0.001 to 0.003 mm, and the nickel gate layer is electroplated on the surface of the copper alloy layer.

[0010] Furthermore, the wear-resistant coating is a copper-tin-lead ternary alloy coating with a thickness of 0.015–0.040 mm, and the copper-tin-lead ternary alloy coating is electroplated on the surface of the nickel gate layer. The composition of the copper-tin-lead ternary alloy coating includes Sn: 8-12%, Cu: 1-3%, and the remainder Pb.

[0011] Furthermore, the wear-resistant coating is tin-plated on its surface to form a tin surface layer, the thickness of which is 0.001 to 0.002 mm.

[0012] Furthermore, two oil inlet holes are radially provided on the side wall of the bearing body, and the diffusion oil groove is disposed between the two oil inlet holes. Both the oil inlet holes and the diffusion oil groove are disposed in the non-load-bearing area of ​​the bearing body. Two marking lines are provided on the outer wall of the bearing body along its generatrix direction, with the non-load-bearing area and the load-bearing area on both sides of the two marking lines, respectively.

[0013] Furthermore, the inner side of the oil inlet hole is an oil inlet groove, and the oil inlet hole is located in the middle of the oil inlet groove; the diffusion oil groove is an arc-shaped groove, and both ends of the diffusion oil groove extend into the oil inlet groove, and the diffusion oil groove is located in the middle along the width direction of the bearing body.

[0014] Furthermore, the bottom surface of the oil inlet groove is arc-shaped, and the surrounding edges are rectangular. The oil inlet hole is located at the deepest part of the oil inlet groove, and the central axis of the oil inlet groove is parallel to the central axis of the bearing body.

[0015] Furthermore, the diameter of the oil inlet hole is 30mm, and the deepest point of the oil inlet groove is 2.5mm; the depth of the diffusion oil groove is 2.5mm, and the width of the diffusion oil groove is greater than the diameter of the oil inlet hole, and the openings at both ends of the diffusion oil groove extend into the oil inlet groove.

[0016] The technological advancements achieved by this invention compared to existing technologies are as follows: The bearing body of this invention is a seamless, one-piece ring composed of a multi-layered composite structure, eliminating stress concentration at the mating surface and solving the problem of short lifespan of traditional half-shield bearings at high speeds. The bearing body consists of a steel backing layer, a copper alloy layer, a bonding layer, a wear-resistant plating layer, and a tin surface layer, arranged sequentially from the outer circumference to the inner hole. A high-performance wear-resistant plating layer is also coated on its inner wall. Simultaneously, an oil inlet hole and a diffusion groove connecting to the oil inlet hole are radially arranged on the side wall of the bearing body, with the diffusion groove located on the inner wall of the non-load-bearing area. This bearing body structure provides high-strength support, excellent thermal conductivity, good wear resistance, and superior surface compliance (running-in performance), and also facilitates the rapid establishment and maintenance of a lubricating oil film. The bearing body provided by this invention has an interference fit with the bearing housing, which increases its average service life from approximately 15 days to more than three months, greatly improving the rolling mill's operating rate and economy. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] In the attached diagram: Figure 1 An outline drawing of an oil film bearing suitable for the roll ring side of a high-speed rolling mill, provided for an embodiment of this utility model; Figure 2 This is a cross-sectional view of the oil film bearing at the oil inlet in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the oil film bearing in an embodiment of this utility model; Figure 4 for Figure 3 Half-sectional view of an oil film bearing; Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0019] In the picture: 00-Bearing body; 1-Steel backing layer; 2-Copper alloy layer; 3-Adhesive layer; 4-Wear-resistant plating layer; 5-Tin surface layer; 6-Oil inlet hole; 7-Diffusion oil groove; 8-Oil inlet groove; 9-Non-load-bearing area; 10-Load-bearing area; 11-Identification line engraving. Detailed Implementation

[0020] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0021] like Figure 1 , Figure 2 , Figure 5As shown in the figure, this utility model provides an oil film bearing suitable for the side of a high-speed rolling mill roll ring, including a bearing body 00 for interference fit with the inner hole of the bearing housing. The bearing body 00 is an integral seamless ring composed of a multi-layer composite structure. From the outer circle to the inner hole, it consists of a steel backing layer 1, a copper alloy layer 2, an adhesive layer 3, a wear-resistant plating layer 4, and a tin surface layer 5. The side wall of the bearing body 00 is radially provided with an oil inlet hole 6 that penetrates both the inside and outside. The non-load-bearing area of ​​the bearing body 00 is provided with a diffusion oil groove 7 that connects to the oil inlet hole 6. By adopting the above-mentioned multi-layer composite structure and integrally formed bearing body, and through the lubrication oil circuit composed of the oil inlet hole and the diffusion oil groove, the lubrication effect, load-bearing capacity, and fatigue resistance of the bearing under high-speed and heavy-load conditions can be significantly improved, increasing the average service life from about 15 days to more than three months, greatly improving the rolling mill operating rate and economy.

[0022] In specific manufacturing, the copper alloy layer 2 is CuPb with a hardness of 55-75 HB. 24 Sn4, the copper alloy layer 2 is centrifugally cast and connected to the steel backing layer 1; the thickness of the copper alloy layer 2 is 0.4-1.2 mm, and the thickness difference of the copper alloy layer 2 along the same generatrix on the bearing body 000 is no greater than 0.25 mm. CuPb 24 Sn4 material combines the strength of bronze with the self-lubricating properties of its high lead content, thus improving bearing lubrication and load-bearing capacity. The centrifugal casting process and CuPb... 24 Sn4 is all existing technology and will not be described in detail here.

[0023] The adhesive layer 3 is a nickel gate layer with a thickness of 0.001 to 0.003 mm, which is electroplated on the surface of the copper alloy layer 2. The nickel gate layer enhances the adhesion between the copper alloy layer and the wear-resistant plating layer.

[0024] The wear-resistant coating 4 is a copper-tin-lead ternary alloy coating with a thickness of 0.015–0.040 mm. This copper-tin-lead ternary alloy coating is electroplated onto the surface of the nickel gate layer. Specifically, the composition of the copper-tin-lead ternary alloy coating is: Sn: 8-12%, Cu: 1-3%, with the remainder being Pb. This composition of the copper-tin-lead ternary alloy is existing technology and will not be described further here.

[0025] The wear-resistant coating 4 is tin-plated to form a tin surface layer 5, the thickness of which is 0.001–0.002 mm. The tin surface layer 5 is a pure tin layer or a high-tin alloy layer, and this composition of the tin surface layer is also existing technology, which will not be described in detail here.

[0026] In specific embodiments of this utility model, such as Figure 3 , 4As shown, the bearing body 00 has two radially arranged oil inlet holes 6 on its side wall, and a diffusion oil groove 7 is disposed between the two oil inlet holes 6. Both the oil inlet holes 6 and the diffusion oil groove 7 are located in the non-load-bearing area 9 of the bearing body 00. Two marking lines are provided along the generatrix direction on the outer wall of the bearing body 00, with the non-load-bearing area 9 and the load-bearing area 10 on either side of the marking lines, respectively. Each oil inlet hole outlet is connected to a short and wide radial diffusion oil groove, which allows the incoming oil to quickly spread circumferentially to both sides. This optimized lubrication path, by placing the diffusion oil groove in the main load-bearing area of ​​the bearing's inner wall, utilizes dynamic pressure to generate the diffusion oil groove. Figure 3 In the embodiment shown, the upper part is the load-bearing area and the lower part is the non-load-bearing area. The lubricating oil enters from the oil inlet hole. There is no oil groove in the load-bearing area. The lubricating oil is eventually carried into the load-bearing area. The diffusion oil groove in the non-load-bearing area plays a role in cooling the shaft.

[0027] Further optimize the above structure, such as Figure 2 , 3 As shown, the inner side of the oil inlet hole 6 is an oil inlet groove 8, and the oil inlet hole 6 is located in the middle of the oil inlet groove 8; the diffusion groove 7 is an arc-shaped groove, with both ends extending into the oil inlet groove 8, and the diffusion groove 7 is located in the middle along the width direction of the bearing body 00. The bottom surface of the oil inlet groove 8 is arc-shaped, and its surrounding edges are rectangular. The arc-shaped oil inlet groove 8 forms a wedge-shaped oil groove, and its depth gradually decreases from the oil inlet end to the oil outlet end to maximize the dynamic pressure effect; the oil inlet hole 6 is located at the deepest point of the oil inlet groove 8, and the central axis of the oil inlet groove 8 is parallel to the central axis of the bearing body 00. The auxiliary uniform oil distribution structure formed by the oil inlet hole, oil inlet groove, and diffusion groove improves the lubrication effect of the bearing under high-speed and heavy-load conditions.

[0028] In specific manufacturing, the diameter of the oil inlet hole 6 is 30mm, which is 30% to 50% larger than the oil inlet hole of a traditional half-bearing of the same specification; the deepest point of the oil inlet groove 8 is 2.5mm; the depth of the diffusion oil groove 7 is 2.5mm, and the width of the diffusion oil groove is greater than the diameter of the oil inlet hole. The openings at both ends of the diffusion oil groove 7 extend into the oil inlet groove 8. The diffusion oil groove enables the low-pressure oil from the oil inlet hole to be rapidly diffused circumferentially. During operation, the lubricating oil enters the inner wall of the bearing through the external annular oil passage and the oil inlet hole. In the non-load-bearing area, the oil is quickly and evenly spread throughout the circumference of the inner wall of the bearing through the radial diffusion oil groove; in the load-bearing area, the high-speed rotating roller neck carries the lubricating oil adhering to its surface into the converging wedge-shaped area. Due to the wedge-shaped change in the gap, the oil is automatically pumped up in pressure, forming a strong dynamic pressure oil film that lifts the roller neck, achieving full fluid lubrication. Meanwhile, the inner wall of the multi-layered composite structure, especially the copper-tin-lead ternary alloy plating on the surface, ensures a smooth transition and protection during startup and transient processes.

[0029] In practical applications, the integral annular seamless structure of the bearing body, with its outer circle and inner hole of the bearing housing, undergoes an interference fit, completely eliminating the splicing surface and all the drawbacks of the traditional half-bearing structure, and significantly improving the overall rigidity and stability of the bearing assembly. Simultaneously, a stable and reliable hydrodynamic oil film is formed between the inner hole of the bearing body and the roll neck. The multi-layered composite structure of the bearing body facilitates the rapid establishment and maintenance of the lubricating oil film, while also providing high-strength support, excellent thermal conductivity, good wear resistance, and superior surface compliance (running-in performance). The use of a large-diameter oil inlet reduces oil flow resistance, ensuring sufficient lubricating oil enters the bearing clearance. Furthermore, in the non-load-bearing areas of the bearing's inner wall (such as the neutral or offset areas in the upper and lower halves), radially machined diffusion grooves connected to the oil inlet are used to directly guide and diffuse the oil flow from the inlet to the entire circumferential inner wall, achieving rapid and uniform initial distribution of the lubricating oil.

[0030] This invention significantly improves the lubrication effect, load-bearing capacity, and fatigue resistance of oil film bearings under high-speed, heavy-load conditions by comprehensively improving the overall structure, materials, and lubrication structure, thereby greatly enhancing the rolling mill's operating rate and economy. Specific effects are reflected in the following aspects: (1) Significantly improved service life: The integral structure fundamentally eliminates the weak link at the splicing surface of the half-bearing, improving structural strength and fatigue resistance; the optimized oil circuit and high-performance coating work together to ensure the formation of a stable and continuous lubricating oil film under various working conditions (especially at high speeds), greatly reducing the wear rate. Practical applications show that the service life of this oil film bearing on the same high-speed rolling mill can be stably increased from about 15 days to more than three months.

[0031] (2) High operational stability: The overall bearing has high rigidity and small deformation, which allows for better control of the radial runout and axial movement of the rolls, improving rolling accuracy and product quality.

[0032] (3) Enhanced reliability: The optimized oil hole and oil groove design improves oil supply efficiency and heat dissipation, reducing the risk of bearing seizure and burnout due to poor lubrication; the high-performance coating provides additional protection.

[0033] (4) Significant economic benefits: Although the unit cost of oil film bearings is slightly higher than that of existing half-bearing bearings, their lifespan is extended several times, which can greatly reduce downtime for replacement, spare parts consumption and maintenance manpower, and significantly reduce overall maintenance costs.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An oil film bearing suitable for the roll ring side of a high-speed rolling mill, characterized in that: The bearing body includes a bearing body for interference fit with the inner hole of the bearing housing. The bearing body is an integral seamless ring composed of a multi-layer composite structure. From the outer circle to the inner hole, the layers are a steel backing layer, a copper alloy layer, an adhesive layer, a wear-resistant plating layer, and a tin surface layer. The side wall of the bearing body is provided with an oil inlet hole that runs through the inside and outside. The non-load-bearing area of ​​the bearing body is provided with a diffusion oil groove that connects to the oil inlet hole.

2. The oil film bearing suitable for the roll ring side of a high-speed rolling mill according to claim 1, characterized in that: The copper alloy layer is CuPb with a hardness of 55-75 HB. 24 Sn4, the copper alloy layer and the steel backing layer are centrifugally cast together.

3. The oil film bearing suitable for the roll ring side of a high-speed rolling mill according to claim 2, characterized in that: The thickness of the copper alloy layer is 0.4 to 1.2 mm, and the thickness difference of the copper alloy layer along the same generatrix on the bearing body is no greater than 0.25 mm.

4. The oil film bearing suitable for the roll ring side of a high-speed rolling mill according to claim 3, characterized in that: The adhesive layer is a nickel gate layer with a thickness of 0.001 to 0.003 mm, which is electroplated on the surface of the copper alloy layer.

5. The oil film bearing suitable for the roll ring side of a high-speed rolling mill according to claim 4, characterized in that: The wear-resistant coating is a copper-tin-lead ternary alloy coating with a thickness of 0.015 to 0.040 mm, and the copper-tin-lead ternary alloy coating is electroplated on the surface of the nickel gate layer.

6. The oil film bearing suitable for the roll ring side of a high-speed rolling mill according to claim 5, characterized in that: The wear-resistant coating is tin-plated on its surface to form a tin surface layer, the thickness of which is 0.001 to 0.002 mm.

7. An oil film bearing suitable for the roll ring side of a high-speed rolling mill according to any one of claims 1-6, characterized in that: The bearing body has two radially arranged oil inlet holes on its side wall, and the diffusion oil groove is arranged between the two oil inlet holes. Both the oil inlet holes and the diffusion oil groove are located in the non-load-bearing area of ​​the bearing body. The outer wall of the bearing body has two marking lines along its generatrix direction, with the non-load-bearing area and the load-bearing area on both sides of the marking lines, respectively.

8. An oil film bearing suitable for the roll ring side of a high-speed rolling mill according to claim 7, characterized in that: The inner side of the oil inlet hole is an oil inlet groove, and the oil inlet hole is located in the middle of the oil inlet groove; the diffusion oil groove is an arc-shaped groove, and the two ends of the diffusion oil groove extend into the oil inlet groove, and the diffusion oil groove is located in the middle along the width direction of the bearing body.

9. An oil film bearing suitable for the roll ring side of a high-speed rolling mill according to claim 8, characterized in that: The bottom surface of the oil inlet groove is curved and the four edges are rectangular. The oil inlet hole is located at the deepest part of the oil inlet groove, and the central axis of the oil inlet groove is parallel to the central axis of the bearing body.

10. An oil film bearing suitable for the roll ring side of a high-speed rolling mill according to claim 9, characterized in that: The diameter of the oil inlet hole is 30mm, and the deepest point of the oil inlet groove is 2.5mm; the depth of the diffusion oil groove is 2.5mm, and the width of the diffusion oil groove is greater than the diameter of the oil inlet hole, and the openings at both ends of the diffusion oil groove extend into the oil inlet groove.

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