Self-lubricating plain bearing and method for shaping a spherical surface

Abstract

The application provides a self-lubricating joint bearing and a spherical surface shaping method, which comprises a bearing outer ring, a bearing inner ring and a self-lubricating gasket; the bearing inner ring is provided with the bearing outer ring on the outer side, and the self-lubricating gasket is arranged between the bearing outer ring and the bearing inner ring; the outer surface of the bearing inner ring is provided as a spherical surface, the inner surface of the bearing outer ring is provided as a spherical surface, and the self-lubricating gasket is bonded on the inner surface of the bearing outer ring. The application provides a spherical surface shaping method after the self-lubricating joint bearing is extruded, which plays a role in stabilizing the torque while rounding the spherical surface, and effectively reduces the unqualified rate of the bearing.

Description

Technical Field

[0001] This invention relates to the field of bearing forming methods, and more specifically, to self-lubricating spherical plain bearings and spherical forming methods. Background Technology

[0002] Currently, after the extrusion molding of pad-type self-lubricating spherical bearings, uneven contact between the inner and outer ring spherical surfaces often occurs, so a method to solve this problem is needed.

[0003] For example, patent document CN105499298A provides a self-lubricating spherical bearing extrusion molding die and process. The inner walls of both the upper and lower mold cavities are spherical structures. When the upper die moves towards the lower die to the contact position, the inner walls of the upper and lower mold cavities are located on the same spherical surface. During the extrusion molding process, the outer ring shrinks inward due to the combined action of the cavity. Because the inner wall of the cavity is a spherical structure, the deformed part of the outer ring always remains spherical. Patent document CN110732598A provides an extrusion spherical bearing compression molding device and method, belonging to the field of bearing manufacturing technology. The compression molding device mainly includes a mold frame, upper mold, lower mold, upper mold core, lower mold core, ejection spring, and fixing plate. During the compression molding process, a precision mold frame is used for guidance, and the product is positioned and compressed using the mold core. The above-mentioned prior art does not shape the spherical surfaces of the inner and outer rings, resulting in uneven adhesion between the inner and outer ring spherical surfaces. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a self-lubricating spherical bearing and a spherical shaping method.

[0005] A self-lubricating spherical plain bearing according to the present invention includes: an outer bearing ring, an inner bearing ring, and a self-lubricating gasket;

[0006] The bearing outer ring is disposed outside the bearing inner ring, and the self-lubricating gasket is disposed between the bearing outer ring and the bearing inner ring;

[0007] The outer surface of the bearing inner ring is spherical, the inner surface of the bearing outer ring is spherical, and the self-lubricating liner is bonded to the inner surface of the bearing outer ring.

[0008] Preferably, the materials of the bearing outer ring and the bearing inner ring include one or more of steel alloys, titanium alloys, and aluminum alloys.

[0009] Preferably, the material of the self-lubricating liner includes one or more of polytetrafluoroethylene, aramid, carbon fiber, glass fiber, and copper mesh.

[0010] Preferably, the bearing consisting of the bearing outer ring, the bearing inner ring, and the self-lubricating liner is an extruded self-lubricating spherical plain bearing, and the two sides of the outer surface of the bearing outer ring are respectively the first side surface of the bearing outer ring and the second side surface of the bearing outer ring.

[0011] Preferably, a method for spherical shaping of the self-lubricating spherical bearing includes the following steps:

[0012] Step S1: Machining the inner diameter of the bearing outer ring to be larger than the outer spherical surface of the bearing inner ring;

[0013] Step S2: Perform surface treatment on the inner ring of the bearing;

[0014] Step S3: Cut the self-lubricating pad and bond the self-lubricating pad to the inner surface of the outer ring of the bearing;

[0015] Step S4: The bearing outer ring with the self-lubricating liner is fitted onto the outside of the bearing inner ring and then pressed together using a press.

[0016] Step S5: Perform rough machining on the assembled bearing;

[0017] Step S6: Place the bearing in the fixture, apply a load F to one side of the bearing outer ring (first side of the bearing outer ring) through the loading shaft, and maintain pressure.

[0018] Step S7: After unloading the bearing, flip the bearing over and place it in the tooling. Apply a load F to the other side of the bearing outer ring, the second side of the bearing outer ring, through the loading shaft and maintain pressure.

[0019] Step S8: After unloading the bearing, perform precision machining on the bearing.

[0020] Preferably, in steps S6 and S7, the applied load F value is less than or equal to 50% of the axial rated load.

[0021] Preferably, in steps S6 and S7, the pressure holding time T is less than or equal to 30 seconds.

[0022] Preferably, the tooling has an annular bearing surface on its inner side, and one side of the outer ring of the bearing is placed on the bearing surface. The inner diameter D of the bearing surface satisfies the following:

[0023]

[0024] Where, d k C is the ball diameter on the outer surface of the inner ring of the bearing, C is the width of the outer ring of the bearing, t is the adjustment clearance, the value of t is in the range of 0.5-1mm, and h is the thickness of the self-lubricating liner.

[0025] The load F is applied to the side of the inner ring of the bearing that faces away from the bearing surface.

[0026] Preferably, in step S2, the surface treatment of the bearing inner ring is one of hard alloy plating, hard chrome plating, diamond-like carbon plating, and ceramic plating.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This application provides a spherical shaping method after extrusion molding of self-lubricating spherical bearings, which not only rounds the spherical surface but also stabilizes the torque, effectively reducing the bearing defect rate. Attached Figure Description

[0029] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 A schematic diagram of a bearing placed in a tooling for spherical shaping;

[0031] Figure 2 This is a schematic diagram of a flanged groove type self-lubricating spherical bearing.

[0032] Figure 3 This is a schematic diagram of a chamfered self-lubricating spherical bearing.

[0033] Figure 4 This is a schematic diagram of the structure of the self-lubricating spherical bearing in Example 2;

[0034] As shown in the figure:

[0035] Detailed Implementation

[0036] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figure 1 As shown, the spherical shaping method of this embodiment includes the following steps:

[0039] Step S1: Machining the inner diameter of the bearing outer ring 1 to be larger than the outer spherical surface of the bearing inner ring 2; Step S2: Performing surface treatment on the bearing inner ring 2, using one of the following methods: hard alloy plating, hard chrome plating, diamond-like carbon plating, or ceramic plating; Step S3: Cutting the self-lubricating gasket 3 and bonding it to the inner surface of the bearing outer ring 1; Step S4: Fitting the bearing outer ring 1 with the bonded self-lubricating gasket 3 onto the outside of the bearing inner ring 2, and pressing the sleeve together using a press; Step S5: Rough machining the sleeved bearing; Step S6: Placing the bearing in fixture 5. Step S7: After unloading the bearing, flip the bearing over and place it in the fixture 5. Then, apply a load F to the other side of the bearing outer ring 1, the second side 12, through the loading shaft 4. The applied load F is less than or equal to 50% of the axial rated load, and the load is held for a holding time T of less than or equal to 30 seconds. Step S8: After unloading the bearing, perform precision machining on the bearing.

[0040] An annular bearing surface 51 is provided on the inner side of fixture 5. One side of the outer ring 1 of the bearing rests on the bearing surface 51, and a load F is applied to the side of the inner ring 2 of the bearing facing away from the bearing surface 51. The inner diameter D of the bearing surface 51 satisfies:

[0041]

[0042] Where, d k C is the ball diameter on the outer surface of the inner ring 2 of the bearing, C is the width of the outer ring 1 of the bearing, t is the adjustment clearance, and the value of t ranges from 0.5 to 1 mm. h is the thickness of the self-lubricating liner 3.

[0043] like Figure 2 and Figure 3 As shown, this embodiment employs an extruded self-lubricating spherical plain bearing, comprising: an outer bearing ring 1, an inner bearing ring 2, and a self-lubricating gasket 3; the outer bearing ring 1 is disposed outside the inner bearing ring 2, and the self-lubricating gasket 3 is disposed between the outer bearing ring 1 and the inner bearing ring 2; the outer surface of the inner bearing ring 2 is spherical, the inner surface of the outer bearing ring 1 is spherical, and the self-lubricating gasket 3 is bonded to the inner surface of the outer bearing ring 1. The two sides of the outer surface of the outer bearing ring 1 are respectively the first side surface 11 and the second side surface 12 of the outer bearing ring.

[0044] In one embodiment, the materials of the bearing outer ring 1 and the bearing inner ring 2 include one or more of steel alloy, titanium alloy and aluminum alloy, and the materials of the self-lubricating liner 3 include one or more of polytetrafluoroethylene, aramid, carbon fiber, glass fiber and copper mesh.

[0045] Example 2

[0046] Example 2 is a preferred example of Example 1.

[0047] like Figure 2 and Figure 3 As shown, this embodiment includes: bearing outer ring 1, bearing inner ring 2, and self-lubricating gasket 3; bearing outer ring 1, self-lubricating gasket 3, and bearing inner ring 2 are arranged sequentially from the outside to the inside. The inner surface of bearing outer ring 1 is spherical, and the outer surface of bearing inner ring 2 is spherical. The spherical surfaces can be surface treated. The self-lubricating gasket 3 is bonded to the inner spherical surface of bearing outer ring 1.

[0048] The outer ring 1 and inner ring 2 of the bearing are made of any one or more of the following materials: steel alloy, titanium alloy, and aluminum alloy. The self-lubricating gasket 3 is a composite gasket made of polytetrafluoroethylene fiber and aramid fiber. The surface treatment of the spherical surface of the inner ring 2 includes any one of the following: hard alloy plating, hard chrome plating, diamond-like carbon plating, and ceramic plating.

[0049] The spherical shaping method in this embodiment includes any one or more of the following steps:

[0050] Machining steps for bearing outer ring 1: Machin the inner diameter of bearing outer ring 1 to be slightly larger than the outer spherical surface of bearing inner ring 2;

[0051] Surface treatment of bearing inner ring 2: Perform surface treatment on bearing inner ring 2;

[0052] Processing steps for self-lubricating gasket 3: Cut the self-lubricating gasket 3 and bond it to the inner surface of the outer ring 1 of the bearing;

[0053] Bearing forming: The bearing outer ring 1 with the self-lubricating liner 3 is fitted over the bearing inner ring 2, and the fit is pressed together on a press. The bearing outer ring 1 is then machined to a certain size.

[0054] like Figure 1 As shown, bearing spherical shaping: The bearing is placed in the fixture 5, a load F is applied to the first side 11 of the outer ring of the bearing, the pressure is held for a time T, and then the load is unloaded. The bearing is then flipped over, a load F is applied to the second side 12 of the outer ring of the bearing, and then the load is unloaded.

[0055] The applied load F is less than or equal to 50% of the axial rated load or less than or equal to 100 MPa or other load values; the holding time T does not exceed 30 seconds; and the tooling dimension D is within the following range: Where d k C is the diameter of the inner ring 2 of the bearing, C is the width of the outer ring 1 of the bearing, t is the adjustment clearance (take 0.5-1mm), and h is the thickness of the self-lubricating shim 3.

[0056] After the spherical shaping method, the bearing needs to be precision machined to achieve the finished product dimensions and accuracy.

[0057] like Figure 4As shown, in one embodiment, the outer ring 1 of the bearing is made of stainless steel 05Cr17Ni4Cu4Ni, the inner ring 2 of the bearing is made of stainless steel G95Cr18, and the self-lubricating gasket 3 is made of polytetrafluoroethylene braided composite material.

[0058] In one embodiment, the bearing is placed in fixture 5, and an axial load of 1.38 kN (30% of the rated load) is applied to the first side 11 of the bearing outer ring, held for 10 seconds, and then unloaded. The bearing is then flipped over, and an axial load of 1.38 kN (30% of the rated load) is applied to the second side 12 of the bearing outer ring, held for 10 seconds, and then unloaded. At this time, the fixture dimension D is...

[0059] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0060] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for spherical shaping of a self-lubricating spherical bearing, wherein the self-lubricating spherical bearing comprises: Bearing outer ring (1), bearing inner ring (2) and self-lubricating liner (3); The bearing outer ring (1) is provided on the outside of the bearing inner ring (2), and the self-lubricating gasket (3) is provided between the bearing outer ring (1) and the bearing inner ring (2). The outer surface of the bearing inner ring (2) is spherical, the inner surface of the bearing outer ring (1) is spherical, and the self-lubricating gasket (3) is bonded to the inner surface of the bearing outer ring (1); characterized in that it includes the following steps: Step S1: The inner diameter of the bearing outer ring (1) is machined to be larger than the outer spherical surface of the bearing inner ring (2); Step S2, perform surface treatment on the bearing inner ring (2); Step S3: Cut the self-lubricating pad (3) and bond the self-lubricating pad (3) to the inner hole surface of the bearing outer ring (1); Step S4: The bearing outer ring (1) with the self-lubricating liner (3) is fitted onto the outside of the bearing inner ring (2) and then pressed together by a press. Step S5: Perform rough machining on the assembled bearing; Step S6: Place the bearing in the fixture (5) and apply a load to one side of the bearing outer ring (1), the first side (11) of the bearing outer ring, through the loading shaft (4). F And maintain pressure; Step S7: After unloading the bearing, flip the bearing over and place it in the fixture (5). Apply load F to the other side of the bearing outer ring (1), the second side (12) of the bearing outer ring (1), through the loading shaft (4) and maintain pressure. Step S8: After unloading the bearing, perform precision machining on the bearing; In steps S6 and S7, the applied load F The value is less than or equal to 50% of the rated axial load; In steps S6 and S7, the holding time T Less than or equal to 30 seconds; The tooling (5) has an annular bearing surface (51) on its inner side. The outer ring (1) of the bearing is placed on the bearing surface (51) on one side. The inner diameter of the bearing surface (51) is... D satisfy: in, d k The outer diameter of the inner ring (2) of the bearing is given. C The width of the outer ring (1) of the bearing. t To adjust the gap, t The value range is 0.5-1mm. h The thickness of the self-lubricating pad (3); The load F It is applied to the side of the inner ring (2) of the bearing that faces away from the bearing surface (51).

2. The spherical shaping method for a self-lubricating spherical bearing according to claim 1, characterized in that: The materials of the bearing outer ring (1) and the bearing inner ring (2) include one or more of steel alloys, titanium alloys and aluminum alloys.

3. The spherical shaping method for a self-lubricating spherical bearing according to claim 1, characterized in that: The self-lubricating pad (3) is made of one or more of the following materials: polytetrafluoroethylene, aramid, carbon fiber, glass fiber, and copper mesh.

4. The spherical shaping method for a self-lubricating spherical bearing according to claim 1, characterized in that: The bearing composed of the bearing outer ring (1), the bearing inner ring (2) and the self-lubricating liner (3) is an extruded self-lubricating spherical bearing. The two sides of the outer surface of the bearing outer ring (1) are the first side (11) and the second side (12) of the bearing outer ring, respectively.

5. The spherical shaping method for a self-lubricating spherical bearing according to claim 1, characterized in that: In step S2, the surface treatment of the bearing inner ring (2) is one of hard alloy plating, hard chrome plating, diamond-like carbon plating, and ceramic plating.

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