Auxiliary frame body bushing mounting hole polishing tool

Abstract

The utility model discloses an auxiliary frame body bushing mounting hole polishing tool, and belongs to the technical field of tools. The tool comprises a rack; the workbench is used for fixing the auxiliary frame to be polished; the rotating mechanism comprises a rotating shaft fixed to the rack, a bearing arranged on the rotating shaft in a sleeving mode and a bearing seat matched with an outer ring of the bearing, the center of the workbench is fixed to the bearing seat so that the workbench can rotate around the rotating shaft, and a cam bearing of the supporting structure is used for supporting the workbench under the condition that the workbench rotates around the rotating shaft; a limiting mechanism; the left handle mechanism and the right handle mechanism are installed on the workbench, and any one of the left handle mechanism and the right handle mechanism comprises a limiting pin capable of ascending and descending, a spring for driving the limiting pin, a guide shaft and a handle; and under the condition that the workbench rotates to the position above the limiting seat, the limiting pin is clamped into the hole of the limiting seat under the action of the spring so as to lock the position of the workbench. According to the tool, through cooperation of a rotating structure, a supporting structure and a limiting structure, workpieces can be overturned without being carried.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology, and in particular to a tooling for grinding mounting holes of subframe body bushings. Background Technology

[0002] In the casting process of aluminum alloy subframes, sand venting holes need to be set in the mounting holes of the body bushings to meet the requirements of sand removal and casting performance. However, sharp edges are formed at the intersection of the mounting holes and the sand venting holes. If these edges are not effectively treated, the body bushings are easily damaged during the press-fitting process, which can lead to abnormal noises or even scrapping of the assembled subframe, seriously affecting product performance and reliability.

[0003] In related technologies, the treatment of the aforementioned sharp edges relies on manual grinding. However, in these technologies, the subframe has four body bushing mounting points, each requiring grinding. Furthermore, the subframe is large and heavy, necessitating repeated lifting and flipping by workers, resulting in high labor intensity and low efficiency. Therefore, there is an urgent need for a specialized tooling that simplifies the grinding process, reduces labor intensity, and is adaptable to different subframe models. Summary of the Invention

[0004] This utility model provides a grinding fixture for the mounting holes of the subframe body bushing to solve the above-mentioned problems. The technical solution is as follows:

[0005] On the one hand, a grinding fixture for the subframe body bushing mounting holes is provided, including:

[0006] A frame, the frame being used to support the structure of the subframe body bushing mounting hole grinding fixture other than the frame itself;

[0007] A workbench, located on the frame, is used to fix the subframe to be polished;

[0008] The front limit block and the rear limit block are located on the worktable and are used to coarsely limit the subframe to be polished;

[0009] The support structure includes multiple support blocks mounted on the frame, each support block having a cam bearing mounted on it. The cam bearing contacts a nylon washer fixed to the lower end face of the worktable to support the worktable.

[0010] The rotating mechanism includes a rotating shaft fixed to the frame, a bearing sleeved on the rotating shaft, and a bearing seat that is interference-fitted with the outer ring of the bearing. The center of the worktable is fixed on the bearing seat so that the worktable rotates around the rotating shaft. The cam bearing is also used to support the worktable when it rotates around the rotating shaft.

[0011] The limiting mechanism includes a limiting post fixed to the frame and a limiting seat mounted on the limiting post;

[0012] A left and right handle mechanism, symmetrically arranged, is mounted on the worktable. Each of the left and right handle mechanisms includes a liftable limit pin, a spring for driving the limit pin, a guide shaft, and a handle. When the worktable rotates to above the limit seat, the limit pin is engaged in the hole of the limit seat under the action of the spring to lock the position of the worktable.

[0013] In one possible implementation, the number of support blocks is four, which are evenly distributed along the circumference of the worktable.

[0014] In one possible implementation, the limiting mechanism further includes a metal retaining ring fixed to the lower end of the guide shaft, and the spring is sleeved on the guide shaft and abuts against the metal retaining ring and the worktable.

[0015] In one possible implementation, the left and right handle mechanisms further include bushings that are interference-fitted with the worktable, and the guide shaft passes through the inner hole of the bushing and is clearance-fitted with the bushing.

[0016] In one possible implementation, the top of the shaft is provided with a bearing cover plate to restrict axial sliding of the bearing.

[0017] In one possible implementation, the front limiting block and the rear limiting block are provided with grooves that match the shape of the subframe to be polished.

[0018] In one possible implementation, a metal washer is provided between the handle and the guide shaft.

[0019] In one possible implementation, the rotation angle of the worktable is controlled by the engagement position of the left handle mechanism and the right handle mechanism with the limiting seat.

[0020] The technical solution provided by this utility model brings at least the following beneficial effects:

[0021] The technical solution provided by this utility model, through the cooperation of a rotating mechanism and a rotatable worktable, allows the operator to adjust the workpiece orientation simply by turning a handle, eliminating the need to lift the subframe and greatly reducing labor intensity. Multiple cam bearings in the support structure roll in contact with nylon washers, evenly bearing the workpiece weight while ensuring stable worktable rotation, preventing skewing and guaranteeing grinding accuracy. The spring-driven limit pins of the limiting mechanism and handle mechanism, in conjunction with the limit seat, automatically lock the worktable after it has rotated to the correct position, ensuring the grinding position is precisely oriented towards the operator and improving efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a grinding fixture for the mounting holes of a subframe body bushing provided by this utility model;

[0024] Figure 2 This is a cross-sectional view of the rotating part of a grinding fixture for subframe body bushing mounting holes provided by this utility model.

[0025] Figure 3 This is a schematic diagram of the limiting and handle mechanism of a grinding fixture for subframe body bushing mounting holes provided by this utility model;

[0026] Figure 4 This is a cross-sectional view of the limiting part of a grinding fixture for subframe body bushing mounting holes provided by this utility model;

[0027] Figure 5 This is a cross-sectional view of the handle mechanism of a grinding fixture for subframe body bushing mounting holes provided by this utility model.

[0028] Figure 6 This is a top view of a grinding fixture for the mounting holes of a subframe body bushing provided by this utility model.

[0029] Reference numerals in the attached drawings: 1. Frame; 2. Support block; 3. Cam bearing; 4. Nylon washer; 5. Worktable; 6. Bearing cover plate; 7. Bearing seat; 8. Rotating shaft; 9. Front limit block; 10. Rear limit block; 11. Left handle mechanism; 12. Right handle mechanism; 13. Limit post; 14. Limit seat; 15. Limit pin; 16. Metal retaining ring; 17. Spring; 18. Guide shaft; 19. Bushing; 20. Metal washer; 21. Handle. Detailed Implementation

[0030] To make the objectives, technical solutions and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings.

[0031] It should be noted that the terms "first," "second," etc. (if applicable) in the specification of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of utility models consistent with some aspects of this application.

[0032] In the casting process of aluminum alloy subframes, sand venting holes need to be provided in the mounting holes of the body bushings to meet the requirements of sand removal and casting performance. However, sharp edges are easily formed at the intersection of the mounting holes and the sand venting holes. If these sharp edges are not effectively removed, the body bushings are easily damaged during press-fitting, leading to abnormal noises or even scrapping of the subframe, which seriously affects product reliability.

[0033] Currently, the treatment of the aforementioned sharp edges mainly relies on manual grinding. Because the subframe has four body bushing mounting points, and the workpiece is large and heavy, the operation requires repeated lifting and flipping of the subframe (two lifts for each single piece), resulting in extremely high labor intensity and low efficiency. Furthermore, existing grinding methods lack specialized tooling, making it difficult to quickly position and fix the workpiece, further increasing the complexity of the operation. Although some tooling simplifies the process through fixed structures, they generally suffer from poor adaptability and insufficient rotational positioning accuracy, failing to meet the grinding needs of multiple subframe models.

[0034] This utility model provides a grinding fixture for the mounting holes of the subframe body bushing, thereby reducing labor intensity. See also Figure 1 , Figure 1 This is a schematic diagram of a grinding fixture for subframe body bushing mounting holes provided by this utility model. (Combined with...) Figures 2-5 , Figure 2 A cross-sectional view of the rotating part of a grinding fixture for subframe body bushing mounting holes provided by this utility model. Figure 3 A schematic diagram of the limiting and handle mechanism of a grinding fixture for subframe body bushing mounting holes provided by this utility model. Figure 4 5 is a cross-sectional view of the limiting part of a grinding fixture for subframe body bushing mounting holes provided by this utility model; 6 is a cross-sectional view of the handle mechanism of a grinding fixture for subframe body bushing mounting holes provided by this utility model.

[0035] The tooling includes a frame 1, which supports the structure of the subframe body bushing mounting hole grinding tool other than the frame 1; a worktable 5, located on the frame 1, for fixing the subframe to be ground; a front limit block 9 and a rear limit block 10, located on the worktable 5, for coarsely limiting the subframe to be ground; a support structure, including multiple support blocks 2 mounted on the frame 1, each support block 2 having a cam bearing 3 mounted on it, the cam bearing 3 contacting a nylon washer 4 fixed to the lower end face of the worktable 5 to support the worktable 5; and a rotating mechanism, including a rotating shaft 8 fixed to the frame 1, a bearing sleeved on the rotating shaft 8, and a bearing seat 7 with an interference fit to the outer ring of the bearing, the center of the worktable 5 being fixed to the bearing. The worktable 5 is mounted on a seat 7 to allow it to rotate around a rotation axis 8. The cam bearing 3 also supports the worktable 5 when it rotates around the rotation axis 8. The limiting mechanism includes a limiting post 13 fixed to the frame 1 and a limiting seat 14 mounted on the limiting post 13. The left handle mechanism 11 and the right handle mechanism 12 are symmetrically arranged and mounted on the worktable 5. Each of the left handle mechanism 11 and the right handle mechanism 12 includes a liftable limiting pin 15, a spring 17 that drives the limiting pin 15, a guide shaft 18, and a handle 21. When the worktable 5 rotates above the limiting seat 14, the limiting pin 15 is engaged in the hole of the limiting seat 14 under the action of the spring 17 to lock the position of the worktable 5.

[0036] Frame 1 serves as the basic support structure for the grinding fixture for the subframe body bushing mounting holes. It is used to fix and support other components of the fixture, including the worktable 5, support structure, rotation mechanism, and limit mechanism. Frame 1 ensures the overall stability of the fixture through a rigid structural design.

[0037] The worktable 5 is located above the frame 1 and is a horizontally arranged platform structure used to place and fix the sub-frame to be ground. The center of the worktable 5 is connected to the rotating mechanism, allowing the worktable 5 to rotate horizontally around the rotating axis 8. A nylon washer 4 is fixed to the lower end face of the worktable 5, which contacts the cam bearing 3 in the support structure to help support the worktable 5 and reduce rotational resistance.

[0038] The front limiting block 9 and the rear limiting block 10 are fixed to the upper surface of the worktable 5, spaced apart to form a groove structure that matches the contour of the subframe. The groove provides coarse positioning of the subframe, preventing displacement or rotation due to external forces during grinding, thus ensuring a relatively fixed grinding position. (See also...) Figure 6 The image shows a top view of a grinding fixture for subframe body bushing mounting holes. The front limiting block 9 and the rear limiting block 10 secure the subframe.

[0039] The support structure includes multiple support blocks 2, which are evenly distributed around the circumference of the worktable 5 and fixed to the frame 1. A cam bearing 3 is mounted on the upper end of each support block 2, and the rolling surface of the cam bearing 3 contacts the nylon washer 4 on the lower end face of the worktable 5. The cam bearing 3 supports the worktable 5 through rolling friction, bearing the weight of the worktable 5 and the subframe while allowing the worktable 5 to rotate smoothly around the rotation axis 8, and preventing the worktable 5 from tilting or deforming due to excessive localized stress.

[0040] The rotating mechanism includes a rotating shaft 8, a bearing, and a bearing housing 7. The rotating shaft 8 is vertically fixed at the center of the frame 1. The bearing is fitted onto the rotating shaft 8, with its inner ring interference-fitted to the shaft 8. The bearing housing 7 is interference-fitted to the outer ring of the bearing, and its upper end face is fixedly connected to the center of the worktable 5. Through the fit between the bearing housing 7 and the bearing, the worktable 5 can rotate horizontally around the rotating shaft 8. A bearing cover plate 6 is located at the top of the rotating shaft 8, and is bolted to the top of the rotating shaft 8 to limit the axial movement of the bearing. (See also...) Figure 6 The image shows a top view of a tooling for grinding mounting holes in a subframe body bushing. Figure 6 B in the diagram represents the center of workbench 5.

[0041] The limiting mechanism includes a limiting post 13 and a limiting seat 14. The limiting post 13 is vertically fixed to one side of the frame 1, and the limiting seat 14 is installed on the top of the limiting post 13. The limiting seat 14 is provided with a positioning hole that matches the limiting pin 15. When the worktable 5 rotates to a specific angle, the limiting pin 15 in the left handle mechanism 11 or the right handle mechanism 12 can be inserted into the positioning hole of the limiting seat 14 to lock the rotation position of the worktable 5.

[0042] The left handle mechanism 11 and the right handle mechanism 12 are symmetrically installed on both sides of the worktable 5, and their structures are identical. Taking the left handle mechanism 11 as an example, it includes a limit pin 15, a spring 17, a guide shaft 18, a handle 21, a bushing 19, and a metal washer 20. The bushing 19 is interference-fitted and fixed in the mounting hole of the worktable 5, and the guide shaft 18 passes through the inner hole of the bushing 19 and is clearance-fitted with the bushing 19. The upper end of the guide shaft 18 is threaded to the handle 21, and a metal washer 20 is provided between the handle 21 and the guide shaft 18; the lower end of the guide shaft 18 is threaded to the limit pin 15, and a spring 17 is sleeved on the outside of the limit pin 15. The upper end of the spring 17 abuts against the lower surface of the worktable 5, and the lower end is limited by a metal retaining ring 16. In its natural state, the tension of spring 17 pushes the limit pin 15 downward. When the worktable 5 rotates above the limit seat 14, the limit pin 15 is inserted into the positioning hole of the limit seat 14, locking the position of the worktable 5. When the operator lifts the handle 21, the limit pin 15 retracts against the tension of spring 17, releasing the lock and allowing the worktable 5 to rotate.

[0043] For example, the operator places the subframe between the front limit block 9 and the rear limit block 10 of the worktable 5, securing it with a coarse stop via a groove. After grinding one side of the mounting hole, the operator lifts the handle 21 of the left handle mechanism 11, disengaging the limit pin 15 from the positioning hole of the limit seat 14, and then pushes the worktable 5 to rotate around the rotation axis 8. When the right handle mechanism 12 moves above the limit seat 14, the limit pin 15 of the right handle mechanism 12 automatically inserts into the positioning hole of the limit seat 14 under the action of the spring 17, locking the position of the worktable 5, so that the mounting hole on the other side of the subframe faces the operator for grinding. The cam bearing 3 and the nylon washer 4 in the support structure continuously provide rolling support, ensuring smooth rotation and preventing the worktable 5 from shifting.

[0044] This fixture enables rapid switching between multiple workstations on the subframe via a rotating mechanism, while the limiting mechanism and handle mechanism work together to achieve precise positioning. The support structure ensures rotational stability, and the front / rear limiting blocks 10 simplify the clamping process. The overall structure reduces labor intensity while improving grinding efficiency and precision.

[0045] In one possible implementation, the number of support blocks 2 is four, which are evenly distributed along the circumference of the worktable 5.

[0046] Four support blocks 2 are fixed to the frame 1 and arranged at 90° intervals around the rotation center axis of the worktable 5. A cam bearing 3 is mounted on the upper surface of each support block 2, and the rolling surface of the cam bearing 3 contacts the nylon washer 4 on the lower surface of the worktable 5. The circumferentially even distribution of the four support blocks 2 ensures a symmetrical arrangement of the stress points on the worktable 5. During the rotation of the subframe on the worktable 5, the cam bearing 3 continuously supports the worktable 5 through rolling friction. The four support points share the load of the worktable 5 and the subframe, preventing deformation or rotational jamming of the worktable 5 due to localized stress concentration. Furthermore, the evenly distributed support blocks 2 balance the radial offset tendency of the worktable 5 during rotation, ensuring that the rotation axis 8 coincides with the actual axis of rotation, thus improving rotational stability.

[0047] The center of the worktable 5 is connected to the rotating shaft 8 via the bearing seat 7, enabling it to rotate around the shaft. The cam bearings 3 on the four support blocks 2 serve as auxiliary support points, further limiting the radial wobble of the worktable 5 during rotation. The rolling contact design between the cam bearings 3 and the nylon washers 4 ensures support strength while reducing rotational resistance, allowing the operator to easily rotate the worktable 5 using the handle mechanism.

[0048] In one possible implementation, the limiting mechanism further includes a metal retaining ring 16 fixed to the lower end of the guide shaft 18, and a spring 17 sleeved on the guide shaft 18 and abutting between the metal retaining ring 16 and the worktable 5.

[0049] The metal retaining ring 16 is threaded to the lower end of the guide shaft 18. The spring 17 is sleeved on the outer circumference of the guide shaft 18, with the upper end of the spring 17 abutting against the lower surface of the worktable 5 and the lower end of the spring 17 abutting against the upper surface of the metal retaining ring 16. In its natural state, the spring 17 is compressed, and the elastic tension of the spring 17 pushes the metal retaining ring 16 and the guide shaft 18 downward, keeping the limiting pin 15 at the lower end of the guide shaft 18 extended. When the operator lifts the handle 21, the handle 21 moves the guide shaft 18 upward, the spring 17 is further compressed, and the limiting pin 15 rises with the guide shaft 18 and disengages from the positioning hole of the limiting seat 14. After the handle 21 is released, the tension of the spring 17 pushes the metal retaining ring 16 and the guide shaft 18 back to their original positions, and the limiting pin 15 extends again.

[0050] The metal retaining ring 16 is rigidly connected to the guide shaft 18 via threads to prevent axial displacement of the spring 17 when it is under force. The compression stroke of the spring 17 is limited by the distance between the metal retaining ring 16 and the worktable 5, ensuring that the lifting and lowering action of the limit pin 15 is stable and controllable. This design allows the limit pin 15 to respond quickly to the operation of the handle 21, while preventing excessive deformation of the spring 17 and extending its service life.

[0051] In one possible implementation, the left handle mechanism 11 and the right handle mechanism 12 also include a bushing 19 that is interference-fitted with the worktable 5, and a guide shaft 18 that passes through the inner hole of the bushing 19 and is clearance-fitted with the bushing 19.

[0052] The inner bore of bushing 19 is a smooth through hole. Guide shaft 18 passes through the inner bore of bushing 19. The outer diameter of guide shaft 18 is smaller than the inner diameter of bushing 19, forming a clearance fit. Bushing 19 is inserted into the mounting hole of worktable 5 through an interference fit, ensuring that bushing 19 does not loosen when worktable 5 rotates or is subjected to force. The clearance fit between guide shaft 18 and bushing 19 allows guide shaft 18 to move axially up and down along the inner bore of bushing 19, while limiting the radial offset of guide shaft 18, keeping the movement trajectory of guide shaft 18 vertical and preventing misalignment between limit pin 15 and positioning hole of limit seat 14.

[0053] The clearance fit design between the guide shaft 18 and the bushing 19 reduces frictional resistance during the movement of the guide shaft 18, allowing the operator to easily pull the handle 21, while also preventing the guide shaft 18 from jamming due to the small clearance (e.g., 0.1-0.3 mm). In addition, the bushing 19, as a wear-resistant component, protects the mounting holes of the worktable 5 from wear caused by the repeated movement of the guide shaft 18, extending the service life of the tooling.

[0054] In one possible implementation, a bearing cover plate 6 is provided at the top of the shaft to restrict the axial sliding of the bearing.

[0055] The lower surface of the bearing cover plate 6 contacts the upper end face of the bearing inner ring, and the diameter of the bearing cover plate 6 is larger than the outer diameter of the bearing inner ring. The bearing inner ring is interference-fitted onto the rotating shaft 8, and the bearing outer ring is interference-fitted and fixed inside the bearing housing 7. After the bearing cover plate 6 is rigidly connected to the rotating shaft 8 by bolts, the lower surface of the bearing cover plate 6 is in close contact with the upper end face of the bearing inner ring, forming an axial limit. When the worktable 5 and the bearing housing 7 are subjected to axial load, the bearing cover plate 6 prevents the bearing inner ring from moving upward along the rotating shaft 8, preventing axial relative sliding between the bearing and the rotating shaft 8, and ensuring the axial stability of the rotating mechanism.

[0056] The axial limiting design of the bearing cover plate 6 can prevent the bearing from axial movement caused by vibration or external force during rotation, thereby maintaining the coaxiality of the worktable 5 around the rotating shaft 8, reducing rotational runout, and ensuring the accuracy of the subframe grinding position.

[0057] In one possible implementation, the front limiting block 9 and the rear limiting block 10 are provided with grooves that match the shape of the subframe to be polished.

[0058] Specifically, the depth, width, and curvature of the grooves are designed according to the dimensions of the corresponding parts of the subframe, forming a limiting structure that fits snugly against the local surface of the subframe. When the operator places the subframe on the worktable 5, the area near the body bushing mounting holes of the subframe is embedded in the grooves of the front limiting block 9 and the rear limiting block 10. The grooves, through shape matching, restrict the horizontal movement and rotational freedom of the subframe on the worktable 5, achieving rapid rough positioning. During the grinding process, the sidewalls of the grooves contact the subframe, counteracting the lateral force applied by the grinding tool and preventing the subframe from shifting or tipping over.

[0059] The groove contour is formed through contour machining or casting to ensure a perfect fit with the mounting hole area of ​​the specific model of the subframe. For different models of subframes, the tooling can be quickly adapted by replacing the front limit block 9 and rear limit block 10 with corresponding groove shapes, without adjusting the main structure of the tooling. The groove design of the front limit block 9 and rear limit block 10 enables quick clamping and coarse positioning of the subframe through shape matching, reducing manual adjustment time and enhancing the stability of the workpiece during grinding, avoiding a decrease in grinding accuracy due to displacement.

[0060] In one possible implementation, a metal washer 20 is provided between the handle 21 and the guide shaft 18.

[0061] The metal washer 20 is an annular plate structure. The inner diameter of the metal washer 20 matches the outer diameter of the guide shaft 18, and the outer diameter of the metal washer 20 is larger than the diameter of the lower end face of the handle 21. The metal washer 20 is installed between the lower end face of the handle 21 and the upper end face of the guide shaft 18, and the handle 21, metal washer 20, and guide shaft 18 are fastened together by a threaded connection. When the operator pulls or rotates the handle 21, the metal washer 20 bears the axial load when the handle 21 is pressed down or rotated. By increasing the contact area, it disperses local stress and prevents deformation or wear at the threaded connection between the handle 21 and the guide shaft 18 due to stress concentration. At the same time, the rigid material of the metal washer 20 reduces the frictional resistance between the handle 21 and the guide shaft 18, ensuring the smooth operation of the handle 21. In addition, the metal washer 20 enhances the stability of the threaded connection through preload, preventing the handle 21 from loosening during repeated operation. The metal washer 20 improves the durability and operational reliability of the handle mechanism by distributing load, reducing friction, and preventing loosening. It also ensures that the lifting action of the limit pin 15 is stable and controllable, and extends the overall service life of the tooling.

[0062] In one possible implementation, the rotation angle of the worktable 5 is controlled by the engagement position of the left handle mechanism 11 and the right handle mechanism 12 with the limit seat 14.

[0063] The left handle mechanism 11 and the right handle mechanism 12 are symmetrically installed on both sides of the workbench 5. The limit seat 14 is fixed on the limit post 13 of the frame 1. The central axis of the positioning hole of the limit seat 14 is coplanar with the movement trajectory of the limit pin 15 of the left handle mechanism 11 and the right handle mechanism 12.

[0064] When the operator rotates the worktable 5, the left handle mechanism 11 or the right handle mechanism 12 rotates synchronously with the worktable 5 around the rotation axis 8. When the left handle mechanism 11 moves directly above the limit seat 14, the limit pin 15 of the left handle mechanism 11 is inserted into the positioning hole of the limit seat 14 under the tension of the spring 17, and the worktable 5 stops rotating. At this time, the two body bushing mounting holes on the subframe side face the operator. When the worktable 5 continues to rotate until the right handle mechanism 12 moves directly above the limit seat 14, the limit pin 15 of the right handle mechanism 12 is inserted into the positioning hole of the same limit seat 14, and the worktable 5 is locked again. At this time, the two mounting holes on the other side of the subframe face the operator.

[0065] The left handle mechanism 11 and the right handle mechanism 12 are symmetrically distributed on both sides of the central axis of the worktable 5, and their mating positions with the limit seat 14 form a fixed interval of 180° rotation angle. This design ensures that the worktable 5 only needs to be locked twice after each rotation (once for the left handle mechanism 11 and once for the right handle mechanism 12) to complete the switching of the grinding positions of the four mounting holes of the subframe, without the need for additional angle adjustment.

[0066] The left handle mechanism 11 and the right handle mechanism 12, in conjunction with the limiting seat 14, limit the rotation angle of the worktable 5 to a fixed interval of 180°. This physical limiting enables precise switching between the two workstations, avoiding errors caused by manual visual adjustment of the angle, while reducing operation steps and improving grinding efficiency and consistency.

[0067] In summary, the technical solution provided by this utility model, through the connection between the rotating mechanism (rotating shaft, bearing, bearing seat) and the worktable, allows the operator to rotate the subframe 180° simply by turning the handle, enabling the four mounting holes to be ground twice without manual lifting or flipping of the subframe, significantly reducing labor intensity. The four circumferentially evenly distributed support blocks and their cam bearings roll in contact with the nylon washers, forming a symmetrical support structure that evenly bears the weight of the worktable and subframe, reducing rotational resistance, preventing worktable tilting, and ensuring grinding accuracy. The limit pin automatically engages with the positioning hole of the limit seat under the action of a spring. Combined with the 180° symmetrical layout of the left and right handle mechanisms and the limit seats, precise control of the worktable rotation angle is achieved, ensuring the grinding position is quickly aligned with the operator. The grooves of the front and rear limit blocks match the shape of the subframe, achieving rapid coarse positioning; by replacing the limit blocks with different groove shapes, multiple subframe models can be adapted, improving the tooling versatility.

[0068] Those skilled in the art will understand that Figures 1-6 The structure shown does not constitute a limitation on the structure of this utility model. It may include more or fewer components than shown, or combine certain components, or use different component arrangements.

[0069] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0070] The above are merely exemplary embodiments of the present utility model and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A grinding fixture for subframe body bushing mounting holes, characterized in that, include: A frame, the frame being used to support the structure of the subframe body bushing mounting hole grinding fixture other than the frame itself; A workbench, located on the frame, is used to fix the subframe to be polished; The front limit block and the rear limit block are located on the worktable and are used to coarsely limit the subframe to be polished; The support structure includes multiple support blocks mounted on the frame, each support block having a cam bearing mounted on it. The cam bearing contacts a nylon washer fixed to the lower end face of the worktable to support the worktable. The rotating mechanism includes a rotating shaft fixed to the frame, a bearing sleeved on the rotating shaft, and a bearing seat that is interference-fitted with the outer ring of the bearing. The center of the worktable is fixed on the bearing seat so that the worktable rotates around the rotating shaft. The cam bearing is also used to support the worktable when it rotates around the rotating shaft. The limiting mechanism includes a limiting post fixed to the frame and a limiting seat mounted on the limiting post; A left and right handle mechanism, symmetrically arranged, is mounted on the worktable. Each of the left and right handle mechanisms includes a liftable limit pin, a spring for driving the limit pin, a guide shaft, and a handle. When the worktable rotates to above the limit seat, the limit pin is engaged in the hole of the limit seat under the action of the spring to lock the position of the worktable.

2. The grinding fixture for the subframe body bushing mounting holes according to claim 1, characterized in that, The number of support blocks is four, and they are evenly distributed along the circumference of the worktable.

3. The grinding fixture for the subframe body bushing mounting holes according to claim 1, characterized in that, The limiting mechanism also includes a metal retaining ring fixed to the lower end of the guide shaft, and the spring is sleeved on the guide shaft and abuts against the metal retaining ring and the worktable.

4. The grinding fixture for the subframe body bushing mounting holes according to claim 1, characterized in that, The left and right handle mechanisms also include bushings that are interference-fitted with the worktable, and the guide shaft passes through the inner hole of the bushing and is clearance-fitted with the bushing.

5. The grinding fixture for the subframe body bushing mounting holes according to claim 1, characterized in that, The top of the rotating shaft is provided with a bearing cover plate to restrict the axial sliding of the bearing.

6. The grinding fixture for the subframe body bushing mounting holes according to claim 1, characterized in that, The front and rear limiting blocks are provided with grooves that match the shape of the subframe to be polished.

7. The grinding fixture for the subframe body bushing mounting holes according to claim 1, characterized in that, A metal washer is provided between the handle and the guide shaft.

8. The grinding fixture for the subframe body bushing mounting holes according to claim 1, characterized in that, The rotation angle of the workbench is controlled by the engagement position of the left handle mechanism and the right handle mechanism with the limiting seat.

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