Detachable self-lubricating knuckle bearing

Abstract

The utility model provides a detachable self-lubricating knuckle bearing which comprises an inner ring, a male die outer ring, a female die outer ring and a self-lubricating coating which are sequentially arranged from inside to outside. The outer surface of the inner ring comprises a first spherical surface, the inner surface of the male die outer ring comprises a second spherical surface, the inner surface of the female die outer ring comprises a third spherical surface, and the second spherical surface and the third spherical surface are matched with the first spherical surface; the self-lubricating coatings are arranged on the second spherical surface and the third spherical surface; the male die outer ring and the female die outer ring are detachably connected. The bearing comprises the inner ring, the male die outer ring, the female die outer ring and the self-lubricating coating, the outer ring is divided into the male die outer ring and the female die outer ring which are detachably connected, and the combination mode that the inner spherical surface of the outer ring is integrally matched with the outer spherical surface of the inner ring in the prior art is different; the abrasion condition of the self-lubricating coating can be conveniently checked, the lubricating coating material can be conveniently repaired, and the service life of the self-lubricating knuckle bearing is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of spherical bearing technology, specifically to a detachable self-lubricating spherical bearing. Background Technology

[0002] Self-lubricating spherical plain bearings are special types of spherical plain bearings that require no additional lubricant. They are simple in structure, small in size, have high load-bearing capacity, are resistant to impact and corrosion, and have self-aligning capabilities, making them suitable for various harsh working conditions. They are particularly widely used in aerospace and defense weaponry. Failure of self-lubricating spherical plain bearings is mainly caused by the self-lubricating gasket, and overload deformation of the inner and outer rings and uneven assembly clearance between the inner and outer rings directly affect the performance of the gasket.

[0003] A patent document with publication number CN110332232A discloses a self-lubricating spherical bearing and its method, comprising a bearing body, the bearing body including an outer bearing ring (1), an inner bearing ring (2) and multiple self-lubricating gaskets (3), the outer bearing ring (1), the self-lubricating gaskets (3) and the inner bearing ring (2) being arranged sequentially from the outside to the inside; the inner surface of the outer bearing ring (1) is spherical; the outer surface of the inner bearing ring (2) is spherical, and the spherical surface can be surface treated; the self-lubricating gaskets (3) are segmentally bonded to the inner spherical surface of the outer bearing ring (1).

[0004] The existing patent document with publication number CN105499298A discloses a self-lubricating joint bearing extrusion molding die and process. The inner walls of the upper mold cavity and the lower mold cavity are both spherical structures. When the upper mold moves toward the lower mold to the position where the upper mold and the lower mold abut, the inner walls of the upper mold cavity and the lower mold cavity are located on the same spherical surface.

[0005] The existing self-lubricating spherical plain bearing structure has the following shortcomings: the bearing outer ring, self-lubricating gasket, and bearing inner ring are arranged sequentially from the outside to the inside; the inner spherical surface of the outer ring needs to match the outer spherical surface of the inner ring; and the self-lubricating coating material is applied to the inner spherical surface of the outer ring, thus causing the following effects:

[0006] (1) The requirements for self-lubricating coating materials are quite stringent. During the extrusion and rolling process of the bearing outer ring, the self-lubricating coating material also needs to bend and deform under high loads, so it needs to have strong load-bearing and deformation resistance.

[0007] (2) The requirements for the materials of the inner and outer rings of the bearing are quite stringent. The hardness of the material of the inner ring part must be higher than that of the material of the outer ring of the bearing. The material of the outer ring of the bearing must have a high yield strength and the hardness cannot be too high, otherwise the outer ring will be difficult to shape.

[0008] (3) The production of large-diameter or high-hardness self-lubricating spherical bearings places more stringent requirements on extrusion, rolling and other equipment. Utility Model Content

[0009] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a detachable self-lubricating spherical bearing.

[0010] According to the present invention, a detachable self-lubricating spherical bearing includes an inner ring, a punch outer ring, a die outer ring, and a self-lubricating coating, wherein the inner ring, the self-lubricating coating, the punch outer ring, and the die outer ring are arranged sequentially from the inside to the outside.

[0011] The outer surface of the inner ring includes a first spherical surface, the inner surface of the outer ring of the punch includes a second spherical surface, and the inner surface of the outer ring of the die includes a third spherical surface, wherein the second spherical surface and the third spherical surface match the first spherical surface;

[0012] The self-lubricating coating is applied to the second and third spherical surfaces;

[0013] The outer rings of the punch and the outer rings of the die are detachably connected.

[0014] Preferably, the outer ring of the punch and the outer ring of the die are connected by fastening bolts;

[0015] The outer ring of the punch has a threaded hole on its periphery, and the outer ring of the die has a mounting groove on its periphery. The threaded part of the fastening bolt is connected to the threaded hole, and the head of the fastening bolt is installed in the mounting groove.

[0016] Preferably, the inner side of the outer ring of the die includes a first part and a second part, the first part including a first cylindrical surface and the second part including a third spherical surface;

[0017] The outer surface of the outer ring of the punch includes a second cylindrical surface, and the first cylindrical surface matches the second cylindrical surface.

[0018] Preferably, a stepped surface connects the first cylindrical surface and the third spherical surface.

[0019] Preferably, the length of the vertical projection of the first cylindrical surface onto the rotation axis of the assembly is equal to the length of the vertical projection of the third spherical surface onto the rotation axis of the assembly.

[0020] Preferably, a through hole is provided in the center of the inner ring.

[0021] Preferably, the centers of the first sphere, the second sphere, and the third sphere all coincide.

[0022] Preferably, the thickness of the self-lubricating coating on the second spherical surface is equal to the thickness of the self-lubricating coating on the third spherical surface.

[0023] Preferably, multiple threaded holes and mounting slots are provided, with any threaded hole corresponding to any mounting slot;

[0024] Multiple threaded holes are evenly distributed around the outer ring of the punch, and multiple mounting slots are evenly distributed around the outer ring of the die.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. This utility model provides a bearing comprising an inner ring, a punch outer ring, a die outer ring, and a self-lubricating coating. The outer ring is divided into a detachably connected punch outer ring and a die outer ring, which differs from the existing technology where the inner spherical surface of the outer ring is integrated with the outer spherical surface of the inner ring. This facilitates the inspection of the wear condition of the self-lubricating coating and the repair of the lubricating coating material, thereby extending the service life of the self-lubricating spherical bearing.

[0027] 2. This utility model, by setting the bearing to include an inner ring, a punch outer ring, a die outer ring, and a self-lubricating coating, and the outer ring being divided into a detachably connected punch outer ring and a die outer ring, is different from the existing technology in which the inner spherical surface of the outer ring is integrated with the outer spherical surface of the inner ring, which is beneficial for the production of large-diameter self-lubricating spherical bearings.

[0028] 3. This utility model, by setting the bearing to include an inner ring, a punch outer ring, a die outer ring, and a self-lubricating coating, and the outer ring being divided into a detachably connected punch outer ring and a die outer ring, is different from the existing technology in which the inner spherical surface of the outer ring is integrated with the outer spherical surface of the inner ring. This is beneficial to change the manufacturing method of the inner and outer rings of the bearing, get rid of the traditional extrusion and rolling manufacturing methods, and reduce the performance and process requirements of the inner and outer ring materials and the self-lubricating coating material.

[0029] 4. This utility model sets an outer ring including a punch outer ring and a die outer ring. The shapes of the punch outer ring and the die outer ring are matched and can be matched with the outer spherical surface of the inner ring. This not only forms an outer ring that is easy to match with the outer spherical surface of the inner ring, but also forms an outer ring that is easy to disassemble, breaking the technical concept of traditional one-piece outer ring design. Attached Figure Description

[0030] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This diagram mainly illustrates the assembly structure of the self-lubricating spherical bearing of this utility model.

[0032] Figure 2 The main view shows the cross-section of the outer ring of the punch of this utility model along the axial direction.

[0033] Figure 3The side view mainly shows the cross-section of the outer ring of the punch of this utility model along the axial direction;

[0034] Figure 4 The main view shows the cross-section of the outer ring of the die along the axial direction of this utility model.

[0035] Figure 5 The main feature is a side view of the cross-section of the outer ring of the die along the axial direction.

[0036] As shown in the figure:

[0037] Inner ring 1, second cylindrical surface 302

[0038] First spherical surface 101, outer ring of die 4

[0039] Through hole 102 Third spherical surface 401

[0040] Fastening bolt 2 First cylindrical surface 402

[0041] Punch outer ring 3, step surface 403

[0042] Second spherical surface 301 self-lubricating coating 5 Detailed Implementation

[0043] 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 present 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 protection scope of the present invention.

[0044] like Figure 1 As shown, a detachable self-lubricating spherical bearing according to the present invention includes an inner ring 1, a punch outer ring 3, a die outer ring 4, and a self-lubricating coating 5. The inner ring 1, the self-lubricating coating 5, the punch outer ring 3, and the die outer ring 4 are arranged sequentially from the inside to the outside. The outer surface of the inner ring 1 includes a first spherical surface 101, the inner surface of the punch outer ring 3 includes a second spherical surface 301, and the inner surface of the die outer ring 4 includes a third spherical surface 401. The second spherical surface 301 and the third spherical surface 401 match the first spherical surface 101. The self-lubricating coating 5 is disposed on the second spherical surface 301 and the third spherical surface 401. The punch outer ring 3 and the die outer ring 4 are detachably connected.

[0045] This utility model discloses a detachable self-lubricating spherical plain bearing, comprising an inner ring 1, a punch outer ring 3, a die outer ring 4, and a self-lubricating coating 5. The outer ring is divided into a punch outer ring 3 and a die outer ring 4. The outer spherical surface of the inner ring 1 is segmented and fitted with the inner spherical surfaces of the punch outer ring 3 and the die outer ring 4. This differs from existing technologies where the inner spherical surface of one outer ring directly engages with the outer spherical surface of the inner ring 1. This effectively overcomes the limitations of traditional self-lubricating spherical plain bearing extrusion molding, rolling, and other equipment, as well as process and material limitations. It is particularly suitable for manufacturing larger-sized self-lubricating spherical plain bearings, further expanding the selection range and manufacturing methods for the inner and outer ring materials and the self-lubricating coating 5. The detachable connection of the punch outer ring 3 and the die outer ring 4 allows for easier inspection of the wear condition of the self-lubricating coating 5 and repair of the lubricating coating material during application, extending the service life of the self-lubricating spherical plain bearing.

[0046] Specifically, the outer ring 3 of the punch and the outer ring 4 of the die are connected by fastening bolts 2. The outer ring 3 of the punch has threaded holes on its circumference, and the outer ring 4 of the die has mounting grooves on its circumference. The threaded portion of the fastening bolt 2 connects to the threaded holes, and the head of the fastening bolt 2 is installed in the mounting groove. Preferably, multiple threaded holes and mounting grooves are provided, with each threaded hole corresponding to any mounting groove. Multiple threaded holes are evenly distributed on the circumference of the outer ring 3 of the punch, and multiple mounting grooves are evenly distributed on the circumference of the outer ring 4 of the die. The fastening bolt 2 is preferably a standard part, configured as an internal hexagonal bolt. The materials of the fastening bolt 2 include, but are not limited to, stainless steel, aluminum alloy, titanium alloy, and other metallic materials; polyimide, polyetheretherketone, and other polymeric materials; and inorganic non-metallic materials.

[0047] Specifically, the inner ring 1 has a through hole 102 in the middle and a first spherical surface 101 on its outer surface. The materials of the inner ring 1 include, but are not limited to, metal materials such as stainless steel, aluminum alloy, and titanium alloy, polymer materials such as polyimide and polyetheretherketone, and inorganic non-metallic materials.

[0048] Specifically, the thickness of the self-lubricating coating 5 on the second spherical surface 301 is equal to the thickness of the self-lubricating coating 5 on the third spherical surface 401, and the thickness of the self-lubricating coating 5 is between 0.05mm and 3mm. The materials of the self-lubricating coating 5 include, but are not limited to, fabric-type self-lubricating gaskets, molded gaskets, high molecular weight polyethylene, polyimide, polyetheretherketone and other polymer materials, as well as inorganic non-metallic material coatings.

[0049] Specifically, such as Figures 2 to 5As shown, the inner side of the outer ring 4 of the die cavity includes a first part and a second part. The first part includes a first cylindrical surface 402, and the second part includes a third spherical surface 401. The outer surface of the outer ring 3 of the punch includes a second cylindrical surface 302. The first cylindrical surface 402 matches the second cylindrical surface 302. A stepped surface 403 connects the first cylindrical surface 402 and the third spherical surface 401. The length of the vertical projection of the first cylindrical surface 402 on the rotation axis of the assembly and the length of the vertical projection of the third spherical surface 401 on the rotation axis of the assembly are equal. The centers of the first spherical surface 101, the second spherical surface 301, and the third spherical surface 401 all coincide, and the point of coincidence is located on the central axis of the through hole 102.

[0050] One feasible implementation method is as follows:

[0051] The outer surface of the punch outer ring 3 is integrally formed as a second cylindrical surface 302, and one or more threaded holes are provided on its periphery for fixing the fastening bolts 2. A chamfer is provided at the connection between the edge of the punch outer ring 3 and the die outer ring 4, and a self-lubricating coating 5 is bonded to the second spherical surface 301 on the inner side of the punch outer ring 3. The materials of the punch outer ring 3 include, but are not limited to, stainless steel, aluminum alloy, titanium alloy and other metallic materials, polyimide, polyetheretherketone and other polymeric materials, and inorganic non-metallic materials.

[0052] The outer side of the outer die ring 4 is entirely configured as a first cylindrical surface 402, with one or more mounting grooves (through holes 102) on its periphery for mounting fastening bolts 2, and the heads of the fastening bolts 2 are installed inside the mounting grooves. The left half of the inner side of the outer die ring 4 is configured as the first cylindrical surface 402, and the right half is configured as a third spherical surface 401. A self-lubricating coating 5 is bonded to the third spherical surface 401. A stepped surface 403 connects the first cylindrical surface 402 of the left half and the third spherical surface 401 of the right half, so that there is a certain height difference between the first cylindrical surface 402 and the third spherical surface 401. The materials of the outer die ring 4 include, but are not limited to, stainless steel, aluminum alloy, titanium alloy and other metal materials, polyimide, polyetheretherketone and other polymer materials, and inorganic non-metallic materials.

[0053] This utility model also provides a method for manufacturing a detachable self-lubricating spherical bearing, comprising the following steps:

[0054] Step S1: Apply a self-lubricating coating 5 to the second spherical surface 301 and the third spherical surface 401;

[0055] Step S2: Assemble the inner ring 1 and the outer ring 3 of the punch into the outer ring 4 of the die in sequence, so that the first spherical surface 101 fits into the second spherical surface 301 and the third spherical surface 401.

[0056] Step S3: Detachably connect the outer ring 3 of the punch and the outer ring 4 of the die.

[0057] Among them, the first spherical surface 101, the second spherical surface 301 and the third spherical surface 401 are all machined by turning.

[0058] Typically, the outer ring 4 of the die cavity is placed on an annular base, then the inner ring 1 is installed, and finally the outer ring 3 of the punch is placed in. The fit tolerance between the outer ring 3 of the punch and the outer ring 4 of the die cavity is small, and installation can be achieved by gently tapping with a rubber rod.

[0059] The detachable self-lubricating spherical plain bearing of this utility model adopts a different manufacturing method, which has the following advantages compared with the traditional extrusion and roll forming manufacturing methods (taking patent document CN110332232A as an example for specific explanation):

[0060] 1) The outer ring manufacturing process of the bearing in patent document CN110332232A is an integral forming extrusion deformation process. The formation of the inner spherical surface of the outer ring requires extrusion and rolling equipment. When the outer ring size increases, the tonnage processing capacity of the extrusion and rolling equipment needs to be significantly increased. For example, to manufacture an inner diameter exceeding 65mm, a press of 300T or more is usually required. However, using large-tonnage extrusion equipment may damage the integrity of the self-lubricating liner or solid lubricating coating during the extrusion molding process, crushing the self-lubricating liner material or solid lubricating coating in areas with high local stress. This utility model completely abandons the extrusion molding process and can complete the processing of the inner spherical surface of the outer ring using machining equipment, greatly reducing the difficulty of the processing.

[0061] 2) In CN110332232A, the spherical surface of the inner surface of the outer ring of the bearing needs to be modeled after the spherical surface of the inner ring. Therefore, when processing according to CN110332232A, the hardness of the inner ring spherical surface material must be sufficiently high, significantly higher than that of the outer ring material. Otherwise, damage or deformation of the inner ring spherical surface is likely during the extrusion process. Simultaneously, during the extrusion deformation process, the self-lubricating gasket or solid lubricating coating needs to deform from a cylindrical surface to a spherical surface, and the stressed parts in the middle need to withstand significant extrusion pressure. Therefore, high requirements are placed on the load-bearing and deformation capabilities of the self-lubricating gasket or solid lubricating coating. This utility model does not impose the aforementioned stringent restrictions on equipment and materials.

[0062] 3) The extrusion deformation process in CN110332232A is irreversible, and the consistency control of the radial and axial clearances of the inner and outer rings is difficult. During manufacturing, it is generally necessary to conduct random inspections using the first piece and batch extrusions after extrusion, and to verify clearance consistency through destructive testing. Using the method of this invention, precision machining can be performed directly, resulting in high dimensional accuracy and good consistency. Furthermore, due to its detachable nature, the surface coating or self-lubricating liner material can be repaired, extending the bearing's service life.

[0063] Example 1

[0064] The self-lubricating spherical plain bearing consists of five parts: an inner ring 1, fastening bolts 2, a punch outer ring 3, a die outer ring 4, and a self-lubricating coating 5. During manufacturing, the same self-lubricating coating 5, with a thickness of 0.40 mm, is uniformly applied to the third spherical surface 401 of the die outer ring 4 (made of stainless steel 05Cr17Ni4Cu4Nb) and the second spherical surface 301 of the punch outer ring 3 (made of stainless steel 05Cr17Ni4Cu4Nb). The material is a PTFE / Nomex blended woven self-lubricating gasket. Then, the inner ring 1 and punch outer ring 3 (made of stainless steel G95Cr18) are sequentially assembled into the die outer ring 4, so that the first spherical surface 101 of the inner ring 1 fits against the second spherical surface 301 of the punch outer ring 3 and the third spherical surface 401 of the die outer ring 4. Finally, the punch outer ring 3 and the die outer ring 4 are connected together by installing steel fastening bolts 2, forming a complete steel self-lubricating spherical plain bearing.

[0065] Example 2

[0066] The self-lubricating spherical plain bearing consists of five parts: an inner ring 1, fastening bolts 2, a punch outer ring 3, a die outer ring 4, and a self-lubricating coating 5. During manufacturing, the same self-lubricating coating 5, 0.30 mm thick, is uniformly applied to the third spherical surface 401 of the 7075 stainless steel die outer ring 4 and the second spherical surface 301 of the 7075 stainless steel punch outer ring 3. Then, the 7075 stainless steel inner ring 1 and punch outer ring 3 are sequentially assembled into the die outer ring 4, ensuring that the first spherical surface 101 of the inner ring 1 fits against the second spherical surface 301 of the punch outer ring 3 and the third spherical surface 401 of the die outer ring 4. Finally, aluminum fastening bolts 2 are installed to connect the punch outer ring 3 and the die outer ring 4, forming a complete aluminum self-lubricating spherical plain bearing.

[0067] Example 3

[0068] The self-lubricating spherical plain bearing consists of five parts: an inner ring 1, fastening bolts 2, a punch outer ring 3, a die outer ring 4, and a self-lubricating coating 5. During manufacturing, the same self-lubricating coating 5, with a thickness of 0.25 mm, is uniformly applied to the third spherical surface 401 of the polyimide die outer ring 4 and the second spherical surface 301 of the polyimide punch outer ring 3. Then, the polyimide inner ring 1 and punch outer ring 3 are sequentially assembled into the die outer ring 4, ensuring that the first spherical surface 101 of the inner ring 1 fits against the second spherical surface 301 of the punch outer ring 3 and the third spherical surface 401 of the die outer ring 4. Finally, the polyimide fastening bolts 2 are installed to connect the punch outer ring 3 and the die outer ring 4, forming a complete self-lubricating spherical plain bearing made entirely of composite materials.

[0069] This invention provides a detachable self-lubricating spherical plain bearing and its manufacturing method. Compared with traditional self-lubricating spherical plain bearings and their manufacturing methods, this invention avoids the limitations imposed by existing technologies on equipment such as extrusion molding and rolling, as well as various technical conditions related to processes and materials. Using this invention's detachable self-lubricating spherical plain bearing and its manufacturing method, self-lubricating spherical plain bearings of different materials, specifications, and even larger sizes can be manufactured. This further improves the dimensional machining and assembly accuracy of parts, expands the selection range and manufacturing methods for inner and outer ring materials and lubricating coating materials, and allows for convenient inspection of the wear condition of the self-lubricating coating and repair of the lubricating coating material during application, thus extending the service life of the self-lubricating spherical plain bearing.

[0070] 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.

[0071] The specific embodiments of this utility model have been described above. It should be understood that this utility model 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 substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A detachable self-lubricating spherical plain bearing, characterized in that, It includes an inner ring (1), a punch outer ring (3), a die outer ring (4), and a self-lubricating coating (5), wherein the inner ring (1), the self-lubricating coating (5), the punch outer ring (3), and the die outer ring (4) are arranged sequentially from the inside to the outside; The outer surface of the inner ring (1) includes a first spherical surface (101), the inner surface of the outer ring of the punch (3) includes a second spherical surface (301), and the inner surface of the outer ring of the die (4) includes a third spherical surface (401). The second spherical surface (301) and the third spherical surface (401) match the first spherical surface (101). The self-lubricating coating (5) is disposed on the second spherical surface (301) and the third spherical surface (401); The outer ring of the punch (3) and the outer ring of the die (4) are detachably connected.

2. The detachable self-lubricating spherical bearing as described in claim 1, characterized in that, The outer ring of the punch (3) and the outer ring of the die (4) are connected by fastening bolts (2); The outer ring (3) of the punch is provided with a threaded hole on its periphery, and the outer ring (4) of the die is provided with a mounting groove on its periphery. The threaded part of the fastening bolt (2) is connected to the threaded hole, and the head of the fastening bolt (2) is installed in the mounting groove.

3. The detachable self-lubricating spherical bearing as described in claim 1, characterized in that, The inner side of the outer ring (4) of the die includes a first part and a second part, the first part including a first cylindrical surface (402) and the second part including a third spherical surface (401); The outer surface of the outer ring (3) of the punch includes a second cylindrical surface (302), and the first cylindrical surface (402) matches the second cylindrical surface (302).

4. The detachable self-lubricating spherical bearing as described in claim 3, characterized in that, A stepped surface (403) connects the first cylindrical surface (402) and the third spherical surface (401).

5. The detachable self-lubricating spherical bearing as described in claim 3, characterized in that, The length of the vertical projection of the first cylindrical surface (402) onto the rotation axis of the assembly is equal to the length of the vertical projection of the third spherical surface (401) onto the rotation axis of the assembly.

6. The detachable self-lubricating spherical bearing as described in claim 1, characterized in that, The inner ring (1) has a through hole (102) in the middle.

7. The detachable self-lubricating spherical bearing as described in claim 1, characterized in that, The centers of the first sphere (101), the second sphere (301), and the third sphere (401) all coincide.

8. The detachable self-lubricating spherical bearing as described in claim 1, characterized in that, The thickness of the self-lubricating coating (5) on the second spherical surface (301) is equal to the thickness of the self-lubricating coating (5) on the third spherical surface (401).

9. The detachable self-lubricating spherical bearing as described in claim 2, characterized in that, Multiple threaded holes and mounting slots are provided, with each threaded hole corresponding to each mounting slot. Multiple threaded holes are evenly arranged on the periphery of the outer ring (3) of the punch, and multiple mounting grooves are evenly arranged on the periphery of the outer ring (4) of the die.

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