Bearing bush machining lathe tool

Abstract

The utility model provides a bearing bush machining lathe tool which comprises a replacing unit and a fixing unit, a first separating piece and a second separating piece are inserted into a first inserting hole and a second inserting hole which are symmetrically formed in the side wall of a mounting groove respectively, and the approximate direction of a plurality of bearing bushes in the mounting groove can be conveniently limited within a specified range; the two sets of pressing blocks are symmetrically arranged on the hole wall of the center hole of the quick-mounting pressing plate, the three pressing blocks of each set of pressing blocks are evenly arranged on the hole wall of the corresponding center hole, each pressing block makes contact with the uppermost bearing bush, the fixing effect of the multiple bearing bushes in the mounting groove is guaranteed, meanwhile, the uppermost bearing bush is evenly stressed, and therefore the bearing bush mounting efficiency is improved. And clamping deformation is reduced. According to the bearing bush machining lathe tool, a plurality of bearing bushes can be fixed at a time, the machining quality of the bearing bushes is guaranteed, meanwhile, the replacement units can be interchanged, the downtime can be effectively shortened, and the machining efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of bearing processing technology, and in particular to a bearing processing lathe tooling. Background Technology

[0002] Electrical circuit breakers play a crucial role in circuit protection. The main linkage structure inside a circuit breaker contains rotating or sliding components that require bearings to ensure accuracy and reliability over extended periods. High-precision (cylindricity) and low-roughness bearings effectively improve product accuracy and lifespan. Reliable and stable product quality often allows companies to go further in a highly competitive market.

[0003] The bearing bush is a semi-circular copper alloy part. In the past, the outer circle and inner hole were machined to the required size before being split into two semi-circular bearing bush parts. However, splitting would cause stress deformation of the parts, resulting in poor cylindricity of the inner hole. The method of clamping with a lathe clamping plate and precision machining of the inner hole was changed. Although the cylindricity of the inner hole was guaranteed, the clamping could not evenly distribute the force on the entire surface of the product, causing the product to vibrate during machining. The surface finish of the product was poor, and it was not possible to clamp a large number of products, resulting in low machining efficiency. Utility Model Content

[0004] To address the problems of poor cylindricity and surface roughness quality and low processing efficiency in the machining of bearing bushes in existing technologies, this utility model provides a lathe tooling for machining bearing bushes.

[0005] This utility model discloses a lathe fixture for machining bearing bushes. The fixture includes a replacement unit and a fixing unit. The replacement unit includes a replacement part, a first partition plate, a second partition plate, and a quick-release pressure plate. One end of the replacement part has a mounting groove at its center. Symmetrically arranged on the groove wall are a first insertion hole and a second insertion hole penetrating the side wall of the replacement part. A fixing recess is provided on the side wall of the replacement part near the first insertion hole at its center. The first partition plate includes a first partition portion and a first insertion portion. The first insertion portion is perpendicularly connected to the first partition portion and is located within the mounting groove, contacting the groove wall. The first insertion portion is inserted into the first insertion hole and fits against the hole wall. The second partition plate includes a second partition portion and a second insertion portion. The second insertion portion is perpendicularly connected to the second partition portion and is located within the mounting groove, fitting against the groove wall. The second insertion part is inserted into the second insertion hole and fits against the wall of the second insertion hole. The quick-release pressure plate is detachably fixed on the end face of the replacement part with the installation groove. The quick-release pressure plate has a central hole in the middle. Two sets of pressure blocks are symmetrically arranged on the wall of the central hole. The symmetrical plane of the first insertion hole and the second insertion hole is perpendicular to the symmetrical plane of the two sets of pressure blocks. Each set of pressure blocks includes three pressure blocks evenly arranged on the wall of its corresponding central hole. Multiple bearing bushes are stacked from bottom to top in the installation groove and contact the groove wall of the installation groove. Each pressure block contacts the uppermost bearing bush. The fixing unit includes a fixing reference part and a fixing locking part. The fixing reference part has a reference fixing hole in the middle. The end of the replacement part away from the quick-release pressure plate is set in the reference fixing hole. The side wall of the fixing reference part has a reference locking hole. The fixing locking part passes through the reference locking hole and abuts against the fixing recess.

[0006] Preferably, the quick-release pressure plate is further provided with two pressure plate fixing holes located on both sides of the symmetrical plane of the two sets of pressure blocks. The replacement part has two replacement fixing holes on its end face near the quick-release pressure plate, corresponding to the two pressure plate fixing holes. Both pressure plate fixing holes are connected to their corresponding replacement fixing holes via pressure plate locking components. Further, each pressure plate fixing hole includes an insertion part and a fixing part, which are connected. The inner diameter of the insertion part is larger than the inner diameter of the fixing part, and the inner diameter of the fixing part is equal to the outer diameter of its corresponding pressure plate locking component. The fixing part is connected to its corresponding replacement fixing hole via pressure plate locking components.

[0007] Preferably, the quick-release pressure plate is provided with an elastic groove at the position corresponding to each pressure block on the outer periphery of the central hole. The elastic groove includes a first part and a second part, which are connected. The first part is connected to the side wall of the corresponding pressure block, and the second part is parallel to the corresponding pressure block.

[0008] Preferably, the outer diameter of the end of the replacement part away from the quick-release plate is smaller than the outer diameter of the end of the replacement part near the quick-release plate, and the outer diameter of the end of the replacement part away from the quick-release plate is equal to the inner diameter of the reference fixing hole.

[0009] Preferably, the side wall of the replacement part away from the quick-release plate is provided with a planar notch, and the minimum distance from the planar notch to the central axis of the replacement part is equal to the distance from the fixing recess to the central axis of the replacement part.

[0010] Preferably, the maximum distance from the first insertion portion to the central axis of the replacement part is less than the distance from the fixing recess to the central axis of the replacement part, and the maximum distance from the second insertion portion to the central axis of the replacement part is less than the distance from the fixing recess to the central axis of the replacement part.

[0011] Preferably, the height of the first insertion portion along the central axis of the replacement member is equal to the height of the first insertion hole along the central axis of the replacement member, and the height of the second insertion portion along the central axis of the replacement member is equal to the height of the second insertion hole along the central axis of the replacement member.

[0012] Preferably, the end face of the first partition near the quick-install pressure plate is coplanar with the end face of the replacement part near the quick-install pressure plate, and the distance from the end face of the first partition away from the quick-install pressure plate to the bottom surface of the mounting groove is less than the height of the lowest bearing bush. The end face of the second partition near the quick-install pressure plate is coplanar with the end face of the replacement part near the quick-install pressure plate, and the distance from the end face of the second partition away from the quick-install pressure plate to the bottom surface of the mounting groove is less than the height of the lowest bearing bush.

[0013] Preferably, the first and second separators are identical.

[0014] Compared with the prior art, the bearing shell machining lathe tooling of this utility model, by inserting a first partition plate and a second partition plate into the first and second insertion holes symmetrically arranged on the side wall of the mounting groove, respectively, facilitates the general orientation of multiple bearing shells in the mounting groove within a specified range; by symmetrically arranging two sets of pressure blocks on the hole wall of the center hole of the quick-release pressure plate, with three pressure blocks of each set evenly arranged on the hole wall of the corresponding center hole, and each pressure block contacting the uppermost bearing shell, the fixture ensures the fixing effect of multiple bearing shells in the mounting groove, while making the uppermost bearing shell evenly stressed and reducing clamping deformation; by setting a fixing recess in the middle of the side wall of the replacement part, the fixing locking part abuts against the fixing recess to fix the replacement part in the reference fixing hole, which can reduce the contact surface between the replacement part and the reference fixing hole, thereby reducing friction and facilitating the insertion or removal of the replacement part into or out of the reference fixing hole, while also preventing the replacement part from deforming and getting stuck in the reference fixing hole. The bearing shell machining lathe fixture of this utility model can fix multiple bearing shells at one time to ensure the machining quality of the bearing shells. At the same time, the replacement units are interchangeable, which can effectively reduce downtime and improve machining efficiency. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a lathe tooling for machining bearing bushes according to an embodiment of the present invention.

[0017] Figure 2 for Figure 1 A structural diagram from another perspective.

[0018] Figure 3 for Figure 1 A schematic diagram of the structure viewed from below.

[0019] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure along the AA direction.

[0020] Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure along the BB direction.

[0021] Figure 6 This is a schematic diagram of the structure of a replacement part according to an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the structure of a quick-release pressure plate according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the structure of the first separator in an embodiment of the present invention. Detailed Implementation

[0024] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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 utility model 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 utility model.

[0026] Please refer to the above. Figures 1 to 8This utility model discloses a lathe tooling for machining bearing bushes 100. The tooling includes a replacement unit 10 and a fixing unit 20.

[0027] The replacement unit 10 includes a replacement component 11, a first partition plate 12, a second partition plate 13, and a quick-release pressure plate 14. One end of the replacement component 11 has a mounting groove 111 at its center. Symmetrically arranged on the groove wall of the mounting groove 111 are a first insertion hole 1111 and a second insertion hole 1112 penetrating the side wall of the replacement component 11. A fixing recess 112 is provided on the side wall of the replacement component 11 near the first insertion hole 1111 to reduce the contact area between the replacement component 11 and the fixing unit 20, thereby reducing friction and facilitating the insertion or removal of the replacement component 11 from the fixing unit 20. The first partition plate 12 includes a first partition portion 121 and a first insertion portion 122. The first insertion portion 122 is perpendicularly connected to the first partition portion 121. The first partition portion 121 is located within the mounting groove 111 and contacts the groove wall of the mounting groove 111. The first insertion portion 122 is inserted into the first insertion hole 111. 1. The second partition 13 includes a second partition portion 131 and a second insertion portion 132, which are perpendicularly connected to the second partition portion 131. The second partition portion 131 is located in the mounting groove 111 and contacts the groove wall of the mounting groove 111. The second insertion portion 132 is inserted into the second socket 1112 and is flush with the wall of the second socket 1112, so that the general direction of the bearing bush 100 is restricted within a specified range by the first partition 12 and the second partition 13. The quick-release pressure plate 14 is detachably fixed to the end face of the replacement part 11 with the mounting groove 111. The quick-release pressure plate 14 has a central hole 141 in the middle. Two sets of pressure blocks 140 are symmetrically arranged on the hole wall of the central hole 141. The symmetry plane of the first socket 1111 and the second socket 1112 is perpendicular to the symmetry plane of the two sets of pressure blocks 140. See [reference needed]. Figure 3 The plane of symmetry of the first insertion hole 1111 and the second insertion hole 1112 is the plane containing the cross section along the BB direction in the figure. The plane of symmetry of the two sets of pressure blocks 140 is the plane containing the cross section along the AA direction in the figure. Each set of pressure blocks 140 includes three pressure blocks 1411 evenly arranged on the hole wall of its corresponding central hole 141. Multiple bearing shells 100 are stacked from bottom to top in the mounting groove 111 and in contact with the groove wall of the mounting groove 111. Each pressure block 1411 is in contact with the uppermost bearing shell 100 to ensure the fixing effect of multiple bearing shells 100, and at the same time make the uppermost bearing shell 100 evenly stressed and reduce clamping deformation.

[0028] The fixing unit 20 includes a fixing reference member 21 and a fixing locking member 22. The fixing reference member 21 has a reference fixing hole 211 in the middle. The end of the replacement member 11 away from the quick-release pressure plate 14 is set in the reference fixing hole 211. The side wall of the fixing reference member 21 has a reference locking hole 212. After the fixing locking member 22 passes through the reference locking hole 212, it abuts against the fixing recess 112 to fix the replacement member 11 in the fixing reference member 21. At the same time, it can prevent the replacement member 11 from being deformed and stuck in the reference fixing hole 211.

[0029] To secure the quick-release plate 14 to the replacement part 11, please refer to [reference needed]. Figure 3 , Figure 5 , Figure 6 and Figure 7 The quick-release pressure plate 14 is also provided with two pressure plate fixing holes 142 located on both sides of the symmetrical plane of the two sets of pressure blocks 140. The replacement part 11 has two replacement fixing holes 113 on its end face near the quick-release pressure plate 14, corresponding to the two pressure plate fixing holes 142. Both pressure plate fixing holes 142 are connected to their corresponding replacement fixing holes 113 via pressure plate locking parts 15. Furthermore, each pressure plate fixing hole 142 includes an insertion part 1421 and a fixing part 1422. The insertion part 1421 and the fixing part 1422 are connected. The inner diameter of the insertion part 1421 is larger than the inner diameter of the fixing part 1422, and the inner diameter of the fixing part 1422 is equal to the outer diameter of its corresponding pressure plate locking part 15. The fixing part 1422 is connected to its corresponding replacement fixing hole 113 via pressure plate locking parts 15, facilitating quick installation and removal of the quick-release pressure plate 14.

[0030] To further reduce clamping deformation, please refer to Figure 7 The quick-release pressure plate 14 is provided with an elastic groove 143 at the outer periphery of the central hole 141 and at the position corresponding to each pressure block 1411. The elastic groove 143 includes a first part 1431 and a second part 1432. The first part 1431 and the second part 1432 are connected. The first part 1431 is connected to the side wall of its corresponding pressure block 1411, and the second part 1432 is parallel to its corresponding pressure block 1411. This allows the excessive locking force between the quick-release pressure plate 14 and the replacement part 11 to be transferred away by deformation through the elastic groove 143, making the force on the quick-release pressure plate 14 more uniform.

[0031] To facilitate securing the replacement part 11 within the fixing reference part 21, please refer to... Figure 4 The outer diameter of the end of the replacement part 11 away from the quick-release pressure plate 14 is smaller than the outer diameter of the end of the replacement part 11 close to the quick-release pressure plate 14, and the outer diameter of the end of the replacement part 11 away from the quick-release pressure plate 14 is equal to the inner diameter of the reference fixing hole 211.

[0032] To prevent deformation of the head of the locking member 22, which could prevent the replacement member 11 from being properly removed, please refer to [reference needed]. Figure 5 and Figure 6 The replacement part 11 has a flat notch 114 on the side wall away from the quick-release pressure plate 14. The minimum distance from the flat notch 114 to the central axis of the replacement part 11 is equal to the distance from the fixing recess 112 to the central axis of the replacement part 11. When the head of the fixing locking part 22 is deformed, causing the replacement part 11 to be unable to be removed normally, the replacement part 11 can be removed smoothly by aligning the flat notch 114 with the fixing locking part 22 that cannot be retracted, thus preventing jamming. After removing the replacement part 11, the deformed part of the fixing locking part 22 can be repaired.

[0033] To ensure that the replacement part 11 can be smoothly inserted into the reference fixing hole 211, please refer to Figure 4 The maximum distance from the first insertion portion 122 to the central axis of the replacement part 11 is less than the distance from the fixing recess 112 to the central axis of the replacement part 11, and the maximum distance from the second insertion portion 132 to the central axis of the replacement part 11 is less than the distance from the fixing recess 112 to the central axis of the replacement part 11.

[0034] To ensure the stability of the first separator 12 and the second separator 13, please refer to [link / reference needed]. Figure 4 The height of the first insertion portion 122 along the central axis of the replacement member 11 is equal to the height of the first insertion hole 1111 along the central axis of the replacement member 11, and the height of the second insertion portion 132 along the central axis of the replacement member 11 is equal to the height of the second insertion hole 1112 along the central axis of the replacement member 11.

[0035] To ensure the directional restriction effect on all bearing shells 100 within the mounting groove 111, please refer to [link / reference]. Figure 4 The end face of the first partition 121 near the quick-install pressure plate 14 is coplanar with the end face of the replacement part 11 near the quick-install pressure plate 14. The distance from the end face of the first partition 121 away from the quick-install pressure plate 14 to the bottom surface of the mounting groove 111 is less than the height of the lowest bearing 100. The end face of the second partition 131 near the quick-install pressure plate 14 is coplanar with the end face of the replacement part 11 near the quick-install pressure plate 14. The distance from the end face of the second partition 131 away from the quick-install pressure plate 14 to the bottom surface of the mounting groove 111 is less than the height of the lowest bearing 100.

[0036] Preferably, the first separator 12 and the second separator 13 are the same; please refer to [link / reference]. Figure 4 The first socket 1111 and the second socket 1112 are symmetrically arranged about the vertical plane passing through the center line in the figure. The first partition 12 and the second partition 13 are also symmetrically arranged about the vertical plane, so that the center of gravity of the tooling is more centered, thereby further increasing the turning speed of the lathe and reducing the roughness of the inner hole of the product.

[0037] In practical use, the quick-release pressure plate 14 is made of spring steel (such as HRC37-42), which is not easy to undergo plastic deformation and has a certain elasticity; the replacement part 11 is made of Cr12MoV material, which is hardened to high hardness, wear-resistant and deformation-resistant.

[0038] Usage method: First, stack multiple bearing shells 100 from bottom to top in the mounting groove 111 of the replacement part 11. The first separator 12 and the second separator 13 restrict the general orientation of the multiple bearing shells 100 within a specified range. Then, install the quick-release pressure plate 14 on the replacement part 11, so that the symmetrical plane of the first insertion hole 1111 and the second insertion hole 1112 is perpendicular to the symmetrical plane of the two sets of pressure blocks 140, and each pressure block 1411 is in contact with the uppermost bearing shell 100, fixing the multiple bearing shells 100 in the mounting groove 111. After that, insert the end of the replacement part 11 away from the quick-release pressure plate 14 into the reference fixing hole 211 in the middle of the fixing reference part 21. Fix the replacement part 11 to the fixing reference part 21 by the fixing locking part 22 abutting against the fixing recess 112 on the replacement part 11. Finally, fix the fixing reference part 21 on the CNC lathe chuck, so that multiple bearing shells 100 can be processed at the same time.

[0039] After the multiple bearing bushes 100 in the replacement part 11 are processed, loosen the fixing locking part 22 and take out the replacement part 11. Place another replacement part 11 with multiple bearing bushes 100 installed in the reference fixing hole 211 in the middle of the fixing reference part 21. Tighten the fixing locking part 22 so that it abuts against the fixing recess 112 on the replacement part 11, and the next round of processing can begin. This effectively reduces downtime and improves processing efficiency.

[0040] This utility model discloses a lathe fixture for machining bearing bushes. By inserting a first and a second partition plate into the first and second insertion holes symmetrically arranged on the sidewalls of the mounting groove, the approximate orientation of multiple bearing bushes within the mounting groove is easily restricted within a specified range. Two sets of pressure blocks are symmetrically arranged on the wall of the central hole of the quick-release pressure plate. Each set of pressure blocks has three blocks evenly distributed on the wall of the corresponding central hole, and each pressure block contacts the uppermost bearing bush. This ensures the fixing effect of multiple bearing bushes within the mounting groove while ensuring uniform force on the uppermost bearing bush, reducing clamping deformation. A fixing recess is provided in the middle of the sidewall of the replacement part. The fixing locking part abuts against the fixing recess to fix the replacement part in the reference fixing hole. This reduces the contact area between the replacement part and the reference fixing hole, thereby reducing friction and facilitating the insertion or removal of the replacement part from the reference fixing hole. It also prevents deformation of the replacement part from causing it to jam in the reference fixing hole. The bearing shell machining lathe fixture of this utility model can fix multiple bearing shells at one time to ensure the machining quality of the bearing shells. At the same time, the replacement unit has interchangeable characteristics, which can effectively reduce downtime and improve machining efficiency.

[0041] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described above can be combined with each other as long as they do not conflict with each other. It must be pointed out that the disclosed embodiments do not limit the scope of this utility model. On the contrary, any modifications and refinements made without departing from the spirit and scope of this utility model are within the patent protection scope of this utility model.

Claims

1. A lathe fixture for machining bearing bushes, characterized in that, The tooling includes a replacement unit and a fixing unit. The replacement unit includes a replacement component, a first partition plate, a second partition plate, and a quick-release pressure plate. The replacement component has a mounting groove at the center of one end. Symmetrically arranged on the groove wall are a first insertion hole and a second insertion hole penetrating the side wall of the replacement component. A fixing recess is located on the side wall of the replacement component near the first insertion hole. The first partition plate includes a first partition portion and a first insertion portion. The first insertion portion is perpendicularly connected to the first partition portion and is located within the mounting groove, contacting the groove wall. The first insertion portion is inserted into the first insertion hole and fits against the hole wall. The second partition plate includes a second partition portion and a second insertion portion. The second insertion portion is connected to... The second partition is vertically connected and located in the mounting groove and in contact with the groove wall. The second insertion part is inserted into the second insertion hole and fits against the hole wall of the second insertion hole. The quick-release pressure plate is detachably fixed to the end face of the replacement part with the mounting groove. The quick-release pressure plate has a central hole in the middle. Two sets of pressure blocks are symmetrically arranged on the hole wall of the central hole. The symmetry plane of the first insertion hole and the second insertion hole is perpendicular to the symmetry plane of the two sets of pressure blocks. Each set of pressure blocks includes three pressure blocks evenly arranged on the hole wall of its corresponding central hole. Multiple bearing bushes are stacked from bottom to top in the mounting groove and in contact with the groove wall of the mounting groove. Each pressure block is in contact with the uppermost bearing bush. The fixing unit includes a fixing reference component and a fixing locking component. The fixing reference component has a reference fixing hole in the middle. The end of the replacement component away from the quick-release pressure plate is disposed in the reference fixing hole. The fixing reference component has a reference locking hole on its side wall. The fixing locking component passes through the reference locking hole and abuts against the fixing recess.

2. The bearing shell machining lathe fixture as described in claim 1, characterized in that, The quick-release pressure plate is also provided with two pressure plate fixing holes located on both sides of the symmetrical plane of the two sets of pressure blocks. The replacement part is provided with two replacement fixing holes on the end face of the quick-release pressure plate, corresponding to the two pressure plate fixing holes. The two pressure plate fixing holes are connected to their corresponding replacement fixing holes through pressure plate locking parts.

3. The bearing shell machining lathe fixture as described in claim 2, characterized in that, Both pressure plate fixing holes include an insertion part and a fixing part. The insertion part and the fixing part are connected. The inner diameter of the insertion part is larger than the inner diameter of the fixing part. The inner diameter of the fixing part is equal to the outer diameter of its corresponding pressure plate locking member. The fixing part and its corresponding replacement fixing hole are connected through the pressure plate locking member.

4. The bearing shell machining lathe fixture as described in claim 1, characterized in that, The quick-release pressure plate is provided with an elastic groove at the outer periphery of the central hole and at the position corresponding to each pressure block. The elastic groove includes a first part and a second part, the first part and the second part are connected, the first part is connected to the side wall of the pressure block corresponding to it, and the second part is parallel to the pressure block corresponding to it.

5. The bearing shell machining lathe fixture as described in claim 1, characterized in that, The outer diameter of the end of the replacement part away from the quick-release pressure plate is smaller than the outer diameter of the end of the replacement part close to the quick-release pressure plate, and the outer diameter of the end of the replacement part away from the quick-release pressure plate is equal to the inner diameter of the reference fixing hole.

6. The bearing shell machining lathe fixture as described in claim 1, characterized in that, The replacement part has a planar notch on the side wall of the end away from the quick-release pressure plate. The minimum distance from the planar notch to the central axis of the replacement part is equal to the distance from the fixing recess to the central axis of the replacement part.

7. The bearing shell machining lathe fixture as described in claim 1, characterized in that, The maximum distance from the first insertion portion to the central axis of the replacement piece is less than the distance from the fixing recess to the central axis of the replacement piece, and the maximum distance from the second insertion portion to the central axis of the replacement piece is less than the distance from the fixing recess to the central axis of the replacement piece.

8. The bearing shell machining lathe fixture as described in claim 1, characterized in that, The height of the first insertion portion along the central axis of the replacement member is equal to the height of the first insertion hole along the central axis of the replacement member, and the height of the second insertion portion along the central axis of the replacement member is equal to the height of the second insertion hole along the central axis of the replacement member.

9. The bearing shell machining lathe fixture as described in claim 1, characterized in that, The end face of the first dividing portion near the quick-install pressure plate is coplanar with the end face of the replacement part near the quick-install pressure plate. The distance from the end face of the first dividing portion away from the quick-install pressure plate to the bottom surface of the mounting groove is less than the height of the lowest bearing. The end face of the second dividing portion near the quick-install pressure plate is coplanar with the end face of the replacement part near the quick-install pressure plate. The distance from the end face of the second dividing portion away from the quick-install pressure plate to the bottom surface of the mounting groove is less than the height of the lowest bearing.

10. A bearing shell machining lathe fixture as described in any one of claims 7 to 9, characterized in that, The first separator and the second separator are the same.

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