A positioning fixture for bearing machining

Abstract

This invention belongs to the field of bearing manufacturing technology, specifically relating to a positioning fixture for bearing processing, comprising: a base assembly, the base assembly having a semi-circular positioning groove adapted to the shape of the bearing; the semi-circular positioning groove including an arc-shaped bottom wall, a side wall, a first end wall, and a second end wall; the arc-shaped bottom wall having a cavity for limiting the forming contour of the positioning lip; the area on the first end wall corresponding to the cavity being formed on a movable insert; the movable insert being movably disposed relative to the arc-shaped bottom wall along a first direction. This invention, by providing a first end wall with a movable insert at the lower end of the positioning groove, ensures that the end wall of the deformed area is always constrained during stamping, effectively suppressing the bulging phenomenon caused by material flowing to the bearing end face, thereby eliminating the need for secondary machining and subsequent deburring processes. This not only solves the interference problem during bearing assembly but also significantly improves production efficiency and reduces manufacturing costs.

Description

Technical Field

[0001] This invention belongs to the field of bearing manufacturing technology, specifically relating to a positioning fixture for bearing processing. Background Technology

[0002] The locating lip of a bearing bush is used to achieve circumferential and axial positioning between the bearing bush and the bearing housing. The locating lip of a thin-walled bearing bush is generally made by stamping. However, due to the lack of constraint on the end face of the bearing bush in the existing stamping process, the bearing bush material will flow towards the end face of the bearing bush during the stamping process, resulting in bulges on the end face of the bearing bush. These bulges in this area will cause interference when the two bearing bushes are assembled in opposition. Existing technology generally eliminates these bulges through secondary machining, but secondary machining increases the process complexity and leaves burrs on the surface of the bearing bush. Subsequent deburring treatment will further increase the production cycle and manufacturing cost of the bearing bush. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a positioning fixture for bearing processing, which can improve the efficiency of bearing production and reduce manufacturing costs.

[0004] To achieve the above and other related objectives, the present invention provides a positioning fixture for bearing machining, comprising:

[0005] A base assembly, wherein the base assembly is provided with a semi-circular positioning groove adapted to the shape of the bearing bush, and the opening of the semi-circular positioning groove is inclined upward;

[0006] The semi-circular positioning groove includes an arc-shaped bottom wall, a side wall arranged along the axial direction of the arc-shaped bottom wall on one side of the arc-shaped bottom wall, a first end wall located at the lower end of the arc-shaped bottom wall, and a second end wall located at the higher end of the arc-shaped bottom wall; the first end wall and the second end wall are respectively arranged radially along the arc-shaped bottom wall.

[0007] The region of the arc-shaped bottom wall adjacent to the first end wall is provided with a cavity for limiting the forming contour of the positioning lip;

[0008] The region on the first end wall corresponding to the cavity is formed on a movable insert;

[0009] The movable insert is movably disposed relative to the arc-shaped bottom wall along a first direction, which is perpendicular to the axial direction of the arc-shaped bottom wall and parallel to the first end wall.

[0010] In an optional embodiment of the present invention, the base assembly includes a fixing module, at least the lower half of the semi-circular positioning groove is formed in the fixing module, and the movable insert is slidably connected to the fixing module along the first direction.

[0011] In an optional embodiment of the present invention, a first elastic element is provided between the movable insert and the fixed module, and the first elastic element is configured such that its elastic force can drive the movable insert to move toward the axis of the arc-shaped bottom wall.

[0012] In an optional embodiment of the present invention, a limiting mechanism is provided between the movable block and the fixed module to limit the movement of the movable block relative to the fixed module.

[0013] In an optional embodiment of the present invention, the base assembly further includes a movable module, which is movably connected to the fixed module along the first direction, and the upper half of the semi-circular positioning groove is formed in the movable module; the arc-shaped bottom wall is evenly divided in the circumferential direction by the interface between the fixed module and the movable module.

[0014] In an optional embodiment of the present invention, a second elastic element and a locking mechanism are provided between the movable module and the fixed module. The second elastic element is configured such that its elastic force can drive the movable module away from the fixed module along the first direction. The locking mechanism is assembled such that when the movable module and the fixed module are closed together, the locking mechanism can hold the movable module and the fixed module in a closed state and can release the movable module and the fixed module from the closed state.

[0015] In an optional embodiment of the present invention, the fixed module has a first side surface arranged in a vertical direction, and the movable module has a second side surface arranged in a vertical direction. The first side surface and the second side surface are respectively parallel to the axial direction of the arc-shaped bottom wall, and when the movable module and the fixed module are closed together, the first side surface and the second side surface are coplanar. The locking mechanism includes a locking tongue, which is movably connected in a vertical direction to one of the first side surface and the second side surface. A third elastic element is provided between the locking tongue and the fixed module or the movable module. The third elastic element is configured such that its elastic force can drive the locking tongue to slide towards the other of the first side surface and the second side surface.

[0016] In an optional embodiment of the present invention, a notch is provided on the side of the fixed module or the movable module away from the semi-circular positioning groove, and the notch is configured to expose a portion of the outer arc surface of the bearing bush.

[0017] In an optional embodiment of the present invention, a base is further included, the base assembly is mounted on the base, the base is provided with a pressing part that is movably arranged in a vertical direction, the pressing part is arranged opposite to the lower half of the semi-circular positioning groove in a vertical direction, a double-rod hydraulic cylinder is provided between the pressing part and the base, the double-rod hydraulic cylinder includes a cylinder body, a piston and connecting rods, the piston is movably arranged in the cylinder body, the inner cavity of the cylinder body is divided into a first chamber and a second chamber by the piston, the two connecting rods are respectively connected to the two ends of the piston, the two connecting rods respectively pass through the two ends of the cylinder body to the outside of the cylinder body, the double-rod hydraulic cylinder is arranged in a vertical direction, one of the cylinder body and the connecting rods is fixedly connected to the pressing part, and the other is fixedly connected to the base, the first chamber and the second chamber are respectively connected to a shut-off valve through a pipe, the shut-off valve is used to control the connection or disconnection of the first chamber and the second chamber.

[0018] In an optional embodiment of the present invention, an upper die holder for mounting a punch is further included. The upper die holder is movably connected to the base in a vertical direction. The pressure part is movably connected to the upper die holder in a vertical direction. A first limiting part for limiting the travel of the pressure part relative to the upper die holder is provided between the upper die holder and the pressure part. A fourth elastic element is provided between the pressure part and the upper die holder. The fourth elastic element is configured such that its elastic force can drive the pressure part to move downward relative to the upper die holder. The shut-off valve is a limit switch shut-off valve, which includes a trigger rod. The trigger rod is configured to open the shut-off valve when the trigger rod is pressed and close the shut-off valve when the trigger rod is released. The valve body of the shut-off valve is fixedly disposed relative to the pressure part. A wedge block is provided on the upper die holder. The wedge block is assembled such that when the upper die holder moves upward relative to the pressure part, the wedge block can press the trigger rod, and when the upper die holder moves downward relative to the pressure part, the wedge block can release the trigger rod.

[0019] The technical advantages of this invention are as follows: By setting a first end wall with a movable insert at the lower end of the positioning groove, the end wall of the deformation area is always constrained during the stamping process, which effectively suppresses the bulging phenomenon caused by the material flowing to the end face of the bearing bush. This eliminates the need for secondary machining and subsequent deburring processes, not only solving the interference problem during the opposing assembly of bearing bushes, but also significantly improving production efficiency, reducing manufacturing costs, and ensuring the consistency of bearing bush processing accuracy and surface quality. Attached Figure Description

[0020] Figure 1 This is a perspective view of the bearing bush provided in an embodiment of the present invention;

[0021] Figure 2This is a perspective view of the positioning fixture provided in an embodiment of the present invention;

[0022] Figure 3 This is a front view of the positioning fixture provided in an embodiment of the present invention;

[0023] Figure 4 This is a front view of the positioning fixture in its unfolded state provided in an embodiment of the present invention;

[0024] Figure 5 This is an exploded view of the positioning fixture provided in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the usage state of the positioning tooling provided in the embodiments of the present invention;

[0026] Figure 7 This is a cross-sectional view of the positioning fixture in use provided in an embodiment of the present invention;

[0027] Figure 8 This is a perspective view of the pressing part and holding mechanism provided in an embodiment of the present invention;

[0028] Figure 9 This is a bottom view of the pressing part and holding mechanism provided in an embodiment of the present invention;

[0029] Figure 10 yes Figure 9 AA section view;

[0030] Figure 11 yes Figure 9 BB cross-sectional view. Detailed Implementation

[0031] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] Figure 1A bearing bush 10 suitable for this invention is shown. One end of the bearing bush 10 is provided with a positioning lip 14. In existing processes, when forming the positioning lip 14, the material at the end of the bearing bush 10 is squeezed and flows towards the end, thereby forming a bulge on the end face 13 of the bearing bush 10 (shaded area in the figure). To solve the above problem, this invention provides a first end wall 203 at the lower end of the positioning groove, and sets the portion of the first end wall 203 corresponding to the stamping area on a movable insert 23. When the movable insert 23 is squeezed by the punch, it can contract obliquely downwards, avoiding interference between the first end wall 203 and the punch. At the same time, during the stamping process, it ensures that the end wall of the deformed part is always in a constrained state, thereby preventing bulges from forming on the end wall 13 of the bearing bush 10, eliminating the need for secondary machining, improving production efficiency, and reducing manufacturing costs.

[0034] Please see Figure 2-11 As shown, the technical solution of the present invention will be described in detail below with reference to specific embodiments:

[0035] Please see Figure 2-5 As shown in Figure 7, the positioning fixture for machining the bearing bush 10 provided in the embodiment of the present invention includes a base assembly 20. The base assembly 20 is provided with a semi-circular positioning groove adapted to the shape of the bearing bush 10, and the opening of the semi-circular positioning groove is inclined upward. The semi-circular positioning groove includes an arc-shaped bottom wall 201, a side wall 202 arranged along the axial direction of the arc-shaped bottom wall 201 on one side, a first end wall 203 located at the lower end of the arc-shaped bottom wall 201, and a second end wall 204 located at the higher end of the arc-shaped bottom wall 201. The first end wall 203 and the second end wall 204 are respectively arranged radially along the arc-shaped bottom wall 201; the area of ​​the arc-shaped bottom wall 201 adjacent to the first end wall 203 is provided with a cavity 205 for limiting the forming contour of the positioning lip 14; the area on the first end wall 203 corresponding to the cavity 205 is formed on a movable insert 23; the movable insert 23 is movably arranged relative to the arc-shaped bottom wall 201 along a first direction, the first direction being perpendicular to the axial direction of the arc-shaped bottom wall 201 and parallel to the first end wall 203. By providing a first end wall 203 with a movable insert 23 at the lower end of the positioning groove, the end wall of the deformed area is always constrained during the stamping process, effectively suppressing the bulging phenomenon caused by material flowing to the end face of the bearing bush 10, thereby eliminating the need for secondary machining and subsequent deburring processes. This not only solves the interference problem during the opposing assembly of the bearing bush 10, but also significantly improves production efficiency, reduces manufacturing costs, and ensures the consistency of the machining accuracy and surface quality of the bearing bush 10.

[0036] Please see Figure 2 , 5As shown in Figure 7, in an optional embodiment of the present invention, the base assembly 20 includes a fixing module 21, at least the lower half of the semi-circular positioning groove is formed in the fixing module 21, and the movable insert 23 is slidably connected to the fixing module 21 along the first direction; a first elastic element 231 is provided between the movable insert 23 and the fixing module 21, the first elastic element 231 being configured such that its elastic force can drive the movable insert 23 to move in a direction close to the axis of the arc-shaped bottom wall 201; a limiting mechanism 232 is provided between the movable insert 23 and the fixing module 21 for limiting the movement stroke of the movable insert 23 relative to the fixing module 21. This further embodiment, by setting a first elastic element 231 and a limiting mechanism 232, enables the movable insert 23 to automatically reset to its initial position after stamping, ensuring that the relative position of the insert and the fixed module 21 is consistent before each stamping, thereby ensuring the repeatability accuracy of the stamping of the positioning lip 14; at the same time, the limiting mechanism 232 avoids the movable insert 23 from being over- or under-reset, which not only maintains the effective constraint on the end face of the bearing bush 10 during stamping, but also prevents processing defects caused by the position deviation of the insert, significantly improving the stability of the tooling and the consistency of processing quality.

[0037] Please see Figure 2-5 As shown, in an optional embodiment of the present invention, the base assembly 20 further includes a movable module 22, which is movably connected to the fixed module 21 along the first direction, and the upper half of the semi-circular positioning groove is formed in the movable module 22; the arc-shaped bottom wall 201 is evenly divided in the circumferential direction by the interface between the fixed module 21 and the movable module 22. This further embodiment places the upper half of the semi-circular positioning groove on the obliquely movable module 22. After stamping, the movable module 22 and the fixed module 21 can be separated along the first direction, forming a demolding gap between the bearing shell 10 and the positioning groove. This effectively avoids the jamming or scratching problems caused by the elastic deformation of the bearing shell 10 during demolding of the traditional integral positioning groove. It protects the surface quality of the bearing shell 10 and improves the demolding efficiency. In addition, the arc center angle of the bearing shell 10 is generally 180°. The design of the evenly divided arc bottom wall 201 ensures that the arc center angle of each arc bottom wall 201 (especially the lower half of the arc bottom wall 201) is no more than 90°. This ensures that the bearing shell 10 can smoothly separate from the cavity 205 along the first direction after the mold is opened, avoiding interference between the bearing shell 10 and the arc bottom wall 201.

[0038] Please see Figure 2-5As shown, in an optional embodiment of the present invention, a second elastic element 221 and a locking mechanism are provided between the movable module 22 and the fixed module 21. The second elastic element 221 is configured such that its elastic force can drive the movable module 22 away from the fixed module 21 along the first direction. The locking mechanism is assembled such that when the movable module 22 and the fixed module 21 are closed together, the locking mechanism can hold the movable module 22 and the fixed module 21 in the closed state and can release the movable module 22 and the fixed module 21 from the closed state. This further embodiment, through the cooperation of the second elastic element 221 and the locking mechanism, realizes the automatic locking and one-handed quick unlocking functions of the movable module 22 and the fixed module 21: when closing the mold, only pressing the movable module 22 is required to automatically lock it, ensuring the stability of the stamping process; when demolding, the module can be quickly separated under the action of the second elastic element 221 by triggering the locking mechanism with one hand, which significantly improves the convenience of operation and avoids the problem of low efficiency of traditional bolt fastening methods, making it suitable for the needs of rapid production line operations.

[0039] Please see Figure 2-5 As shown, in an optional embodiment of the present invention, the fixed module 21 has a first side surface arranged in a vertical direction, and the movable module 22 has a second side surface arranged in a vertical direction. The first side surface and the second side surface are parallel to the axial direction of the arc-shaped bottom wall 201, and when the movable module 22 and the fixed module 21 are closed together, the first side surface and the second side surface are coplanar. The locking mechanism includes a locking tongue 24, which is movably connected in a vertical direction to one of the first side surface and the second side surface. A third elastic element 241 is provided between the locking tongue 24 and the fixed module 21 or the movable module 22. The third elastic element 241 is configured such that its elastic force can drive the locking tongue 24 to slide towards the other of the first side surface and the second side surface. When the movable module 22 and the fixed module 21 are closed, the locking tongue 24 automatically engages in the locking position under the action of elastic force to ensure stamping stability. When unlocking, the module can be quickly separated by pressing the locking tongue 24 vertically with one hand, which is simple and efficient. This design simplifies the traditional locking / unlocking process, which requires two hands, into a single-handed, one-step operation, improving operational efficiency. At the same time, the coplanar design of the sides ensures precise alignment of the locking mechanism, avoiding the risk of misoperation and greatly improving the smoothness of production line operations.

[0040] Please see Figure 2-5As shown, in an optional embodiment of the present invention, a notch 206 is provided on the side wall 202 of the fixed module 21 or the movable module 22 away from the semi-circular positioning groove. The notch 206 is configured to expose a portion of the outer arc surface of the bearing bush 10. This further embodiment, by providing the notch 206 on the side wall 202 of the fixed module 21 or the movable module 22, exposes a portion of the outer arc surface of the bearing bush 10, providing the operator with a direct gripping and force application point, thus solving the problem of difficult part removal in traditional fully enclosed positioning grooves. This design allows the machined bearing bush 10 to be easily pried out by fingers or tools directly through the notch 206, shortening the removal time and avoiding the risk of deformation of the bearing bush 10 caused by forced demolding, thereby improving operational convenience and ensuring product yield.

[0041] Please see Figure 6-11As shown, in an optional embodiment of the present invention, a base 100 is further included. The base assembly 20 is mounted on the base 100. The base 100 is provided with a pressing part 50 that is movably arranged in the vertical direction. The pressing part 50 is arranged opposite to the lower half of the semi-circular positioning groove in the vertical direction. A double-rod hydraulic cylinder 70 is provided between the pressing part 50 and the base 100. The double-rod hydraulic cylinder 70 includes a cylinder body 71, a piston 72, and a connecting rod 73. The piston 72 is movably arranged inside the cylinder body 71, and the inner cavity of the cylinder body 71 is divided by the piston 72. The cylinder 71 is divided into a first chamber and a second chamber. Two connecting rods 73 are respectively connected to the two ends of the piston 72. The two connecting rods 73 pass through the two ends of the cylinder body 71 to the outside of the cylinder body 71. The double-rod hydraulic cylinder 70 is arranged vertically. One of the cylinder body 71 and the connecting rods 73 is fixedly connected to the pressure part 50, and the other is fixedly connected to the base 100. The first chamber and the second chamber are respectively connected to a shut-off valve 80 through pipes. The shut-off valve 80 is used to control the connection or disconnection of the first chamber and the second chamber. It should be understood that in the conventional process, in addition to forming bulges on the end face of the bearing bush 10, bulges are also formed on the inner arc surface of the bearing bush 10 near the stamping area during the stamping process. The bulges in this area will affect the roundness of the inner arc surface of the bearing bush 10. Therefore, the present invention also provides a pressure part 50 to limit the deformation in this area. This invention, through the synergistic action of the pressure section 50 and the double-rod hydraulic cylinder 70, first presses and locks the inner arc surface of the bearing bush 10 before the punch presses the positioning lip 14. This effectively suppresses the convex deformation of the inner arc surface caused by material flow during the stamping process, thereby directly obtaining a smooth inner arc surface forming quality. This not only eliminates the secondary machining steps required by traditional processes but also significantly improves production efficiency and product consistency, achieving high-precision one-time forming of the positioning lip 14 of the bearing bush 10. Specifically, when the shut-off valve 80 is closed, the oil circuit between the two chambers of the hydraulic cylinder is cut off, and the relative position of the piston 72 and the cylinder body 71 is fixed, so that the pressure section 50 maintains a stable clamping force during the stamping process, avoiding the pressure section 50 from retracting due to material stress.

[0042] Please see Figure 6-11As shown, in an optional embodiment of the present invention, an upper die holder 60 for mounting the punch 40 is further included. The upper die holder 60 is movably connected to the base 100 in a vertical direction. The pressing part 50 is movably connected to the upper die holder 60 in a vertical direction. A first limiting part 52 for limiting the travel of the pressing part 50 relative to the upper die holder 60 is provided between the upper die holder 60 and the pressing part 50. A fourth elastic element 51 is provided between the pressing part 50 and the upper die holder 60. The fourth elastic element 51 is configured such that its elastic force can drive the pressing part 50 to move downward relative to the upper die holder 60. Valve 80 is a limit switch shut-off valve, which includes a trigger rod 81. The trigger rod 81 is configured to open the shut-off valve 80 when the trigger rod 81 is pressed, and to close the shut-off valve 80 when the trigger rod 81 is released. The valve body of the shut-off valve 80 is fixedly disposed relative to the pressing part 50. A wedge block 63 is provided on the upper die seat 60. The wedge block 63 is assembled such that when the upper die seat 60 moves upward relative to the pressing part 50, the wedge block 63 can press the trigger rod 81, and when the upper die seat 60 moves downward relative to the pressing part 50, the wedge block 63 can release the trigger rod 81. This further embodiment integrates the punch 40 and the pressure part 50 into the upper die base 60, and sets a first limiting part 52 and a fourth elastic element 51 to realize the pre-clamping function of the pressure part 50: before the punch 40 contacts the bearing bush 10, the pressure part 50 first clamps the inner arc surface of the bearing bush 10 to form an initial constraint; during the stamping process, when the upper die base 60 continues to descend, the fourth elastic element 51 ensures that the pressure part 50 maintains a certain pressure; the mechanical linkage design of the wedge block 63 and the limit switch shut-off valve realizes the automatic switching of the hydraulic locking state: when the upper die base 60 descends, the wedge block 63 disengages from the trigger rod 81, and the shut-off valve 80 closes to keep the pressure part 50 locked; when the upper die base 60 returns, the inclined surface of the wedge block 63 pushes the trigger rod 81 to conduct the oil circuit, automatically releasing the lock. This purely mechanical triggering mechanism is not only fast-responding and highly reliable, but also requires no additional power source, simplifying the control system. At the same time, the rigid contact ensures precise synchronization of each action, further improving the stability of equipment operation and the repeatability of the process.

[0043] In a specific embodiment, a drive column 62 can be connected to the upper mold base 60. The drive column 62 can form a guiding engagement with a crossbeam provided on the base 100. A driving element, such as a hydraulic cylinder, can be provided on the crossbeam for driving the drive column 62 to move up and down. To further improve the stability of the upper mold base 60, a guide sleeve 61 can also be provided on the upper mold base 60, and a guide column 110 that cooperates with the guide sleeve 61 can be provided on the base 100.

[0044] In summary, this invention, by setting a first end wall 203 with a movable insert 23 at the lower end of the positioning groove, ensures that the end wall of the deformation area is always constrained during the stamping process, effectively suppressing the bulging phenomenon caused by material flowing to the end face of the bearing shell 10. This eliminates the need for secondary machining and subsequent deburring processes, not only solving the interference problem during the opposing assembly of the bearing shell 10, but also significantly improving production efficiency and reducing manufacturing costs, while ensuring the consistency of the machining accuracy and surface quality of the bearing shell 10. Furthermore, by placing the upper half of the semi-circular positioning groove on the obliquely movable module 22, this invention allows the movable module 22 to be separated from the fixed module 21 along the first direction after stamping, creating a demolding gap between the bearing shell 10 and the positioning groove. This effectively avoids the jamming caused by the elastic deformation of the bearing shell 10 during demolding, which is common with traditional integral positioning grooves. This invention addresses the issue of scratches, protecting the surface quality of the bearing bush 10 while improving demolding efficiency. Through the cooperation of the second elastic element 221 and the locking mechanism, the invention achieves automatic locking and quick one-handed unlocking of the movable module 22 and the fixed module 21, significantly improving operational convenience and avoiding the inefficiency of traditional bolt tightening methods. Furthermore, through the synergistic action of the pressure section 50 and the double-rod hydraulic cylinder 70, the inner arc surface of the bearing bush 10 is pressed and locked before the punch 40 stamps the positioning lip 14. This effectively suppresses the convex deformation of the inner arc surface caused by material flow during stamping, directly obtaining a smooth inner arc surface forming quality. This not only eliminates the secondary machining steps required by traditional processes but also significantly improves production efficiency and product consistency, achieving high-precision one-time forming of the positioning lip 14 of the bearing bush 10.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0046] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Claims

1. A positioning fixture for machining bearing bushes, characterized in that, include: A base assembly, wherein the base assembly is provided with a semi-circular positioning groove adapted to the shape of the bearing bush, and the opening of the semi-circular positioning groove is inclined upward; The semi-circular positioning groove includes an arc-shaped bottom wall, a side wall arranged along the axial direction of the arc-shaped bottom wall on one side of the arc-shaped bottom wall, a first end wall located at the lower end of the arc-shaped bottom wall, and a second end wall located at the higher end of the arc-shaped bottom wall; the first end wall and the second end wall are respectively arranged radially along the arc-shaped bottom wall. The region of the arc-shaped bottom wall adjacent to the first end wall is provided with a cavity for limiting the forming contour of the positioning lip; The region on the first end wall corresponding to the cavity is formed on a movable insert; The movable insert is movably disposed relative to the arc-shaped bottom wall along a first direction, which is perpendicular to the axial direction of the arc-shaped bottom wall and parallel to the first end wall.

2. The positioning fixture for bearing machining according to claim 1, characterized in that, The base assembly includes a fixing module, at least the lower half of the semi-circular positioning groove is formed in the fixing module, and the movable insert is slidably connected to the fixing module along the first direction.

3. The positioning fixture for bearing machining according to claim 2, characterized in that, A first elastic element is provided between the movable insert and the fixed module. The first elastic element is configured such that its elastic force can drive the movable insert to move toward the axis of the arc-shaped bottom wall.

4. The positioning fixture for bearing machining according to claim 3, characterized in that, A limiting mechanism is provided between the movable block and the fixed module to limit the movement of the movable block relative to the fixed module.

5. The positioning fixture for bearing machining according to claim 2, characterized in that, The base assembly further includes a movable module, which is movably connected to the fixed module along the first direction. The upper half of the semi-circular positioning groove is formed in the movable module. The arc-shaped bottom wall is evenly divided in the circumferential direction by the interface between the fixed module and the movable module.

6. The positioning fixture for bearing machining according to claim 5, characterized in that, A second elastic element and a locking mechanism are provided between the movable module and the fixed module. The second elastic element is configured such that its elastic force can drive the movable module away from the fixed module along the first direction. The locking mechanism is assembled such that when the movable module and the fixed module are closed together, the locking mechanism can keep the movable module and the fixed module in the closed state and can release the movable module and the fixed module from the closed state.

7. The positioning fixture for bearing machining according to claim 6, characterized in that, The fixed module has a first side surface arranged in a vertical direction, and the movable module has a second side surface arranged in a vertical direction. The first side surface and the second side surface are parallel to the axial direction of the arc-shaped bottom wall, and when the movable module and the fixed module are closed together, the first side surface and the second side surface are coplanar. The locking mechanism includes a locking tongue, which is movably connected in a vertical direction to one of the first side surface and the second side surface. A third elastic element is provided between the locking tongue and the fixed module or the movable module. The third elastic element is configured such that its elastic force can drive the locking tongue to slide towards the other of the first side surface and the second side surface.

8. The positioning fixture for bearing machining according to claim 5, characterized in that, The fixed module or the movable module has a notch on the side of the sidewall away from the semi-circular positioning groove, and the notch is configured to expose part of the outer arc surface of the bearing bush.

9. The positioning fixture for bearing machining according to claim 5, characterized in that, It also includes a base, on which the base assembly is mounted. The base has a pressing part that is movably arranged in a vertical direction. The pressing part is arranged vertically opposite to the lower half of the semi-circular positioning groove. A double-rod hydraulic cylinder is provided between the pressing part and the base. The double-rod hydraulic cylinder includes a cylinder body, a piston, and connecting rods. The piston is movably arranged in the cylinder body. The inner cavity of the cylinder body is divided into a first chamber and a second chamber by the piston. The two connecting rods are respectively connected to both ends of the piston and extend from both ends of the cylinder body to the outside of the cylinder body. The double-rod hydraulic cylinder is arranged in a vertical direction. One of the cylinder body and the connecting rods is fixedly connected to the pressing part, and the other is fixedly connected to the base. The first chamber and the second chamber are respectively connected to a shut-off valve through pipes. The shut-off valve is used to control the connection or disconnection of the first chamber and the second chamber.

10. The positioning fixture for bearing machining according to claim 9, characterized in that, It also includes an upper die holder for mounting a punch, the upper die holder being movably connected to the base in a vertical direction, the pressure part being movably connected to the upper die holder in a vertical direction, and a first limiting part for limiting the travel of the pressure part relative to the upper die holder is provided between the upper die holder and the pressure part, and a fourth elastic element is provided between the pressure part and the upper die holder, the fourth elastic element being configured such that its elastic force can drive the pressure part to move downward relative to the upper die holder; the shut-off valve is a limit switch shut-off valve, which includes a trigger rod, the trigger rod being configured to open the shut-off valve when the trigger rod is pressed, and to close the shut-off valve when the trigger rod is released; the valve body of the shut-off valve is fixedly disposed relative to the pressure part, and a wedge block is provided on the upper die holder, the wedge block being assembled such that when the upper die holder moves upward relative to the pressure part, the wedge block can press the trigger rod, and when the upper die holder moves downward relative to the pressure part, the wedge block can release the trigger rod.

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