Mechanical part polishing clamp
By designing an adaptive support rod and clamping mechanism, the deformation problem of hollow mechanical parts during clamping was solved, achieving stable positioning and high-precision machining.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LINXI COUNTY CHUANGWEI MACHINERY MANUFACTURING CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-04-17
AI Technical Summary
When existing fixtures clamp hollow mechanical parts, the large clamping force can cause local stress concentration in the parts, leading to irreversible deformation and affecting machining accuracy and quality.
A fixture comprising a mounting base, a first limiting block, a clamping mechanism, and a support rod is designed. The support rod supports the mechanical parts from the inside, and the clamping mechanism, in conjunction with the slider and threaded rod, achieves adaptive adjustment to avoid deformation caused by excessive clamping force.
It achieves stable positioning of hollow mechanical parts, avoids deformation, ensures machining accuracy and efficiency, is suitable for workpieces with different inner contours, and the clamping blocks can be replaced to adapt to different sizes.
Smart Images
Figure CN224129476U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fixture technology, and in particular to a fixture for grinding mechanical parts. Background Technology
[0002] Grinding fixtures are devices used to fix and position mechanical parts in order to maintain their stability and accuracy during grinding. By clamping, supporting or positioning the parts, they ensure that the grinding operation can be carried out according to the design requirements, thereby improving processing efficiency and product quality.
[0003] In existing technologies, conventional clamps typically rely on clamping plates acting directly on the outer surface of parts to achieve clamping and fixation. To ensure stable positioning of mechanical parts, a high clamping force is required. However, when dealing with hollow mechanical parts, the hollow structure results in significant material inhomogeneity, leading to a substantial difference in overall rigidity compared to solid parts. Under high clamping forces, localized areas of the hollow part, especially those with thinner walls or weaker structures, can experience stresses exceeding their inherent strength limits. This localized stress concentration... The phenomenon of grinding can easily cause irreversible deformation of parts, such as local dents, twisting, or dimensional deviations, which directly leads to a decrease in the machining accuracy of the parts, and may even make the parts completely scrapped, seriously affecting the final quality of the product. However, if the clamping force is reduced to avoid deformation of the parts, the lower clamping force will not be able to provide sufficient constraint to resist the various forces generated during the machining process, which will cause the mechanical parts to loosen during the grinding process. This will lead to inaccurate grinding position, difficulty in controlling surface roughness, and inability to guarantee machining accuracy. Therefore, it is necessary to improve the grinding fixture for mechanical parts to solve the above problems. Utility Model Content
[0004] To overcome the problem that large clamping forces can cause deformation of hollow mechanical parts when clamping them.
[0005] The technical solution of this utility model is as follows: a mechanical parts grinding fixture, including a mounting base, a first limiting block and a clamping mechanism. The mounting base is provided with a clamping mechanism for clamping mechanical parts. The first limiting block is slidably connected to the mounting base. A slider is slidably connected to the first limiting block. A support rod for supporting mechanical parts from the inside is fixedly connected to the top of the slider. Four fixing ears are symmetrically arranged on the side end face of the mounting base.
[0006] Preferably, the mounting base has a groove at the corresponding position of the first limiting block, and the first limiting block slides inside the groove, and the height of the groove is higher than the height of the first limiting block.
[0007] Preferably, a first limiting rod for limiting the slider is fixedly connected to the first limiting block, the slider is slidably connected to the first limiting rod, a spring is fixedly connected between the slider and the first limiting block, a first threaded rod for driving the adjustment of the first limiting block is rotatably connected inside the mounting base, the first limiting block is threadedly connected to the first threaded rod, a first external hexagonal rotating block is fixedly connected to the outside of the first threaded rod, and the first external hexagonal rotating block is rotatably connected to the mounting base.
[0008] Preferably, the first limiting block has a limiting groove at the corresponding position of the slider, and the slider slides inside the limiting groove, so that the slider can move a short distance through the groove and the first limiting rod.
[0009] Preferably, the clamping mechanism includes a second threaded rod rotatably connected to the mounting base. A second external hexagonal rotating block is fixedly connected to the outer side of the second threaded rod and rotatably connected to the mounting base. A second limiting block is threadedly connected to the second external hexagonal rotating block. A plug is inserted into the second limiting block. A clamping block for clamping mechanical parts is fixedly connected to the inner side of the plug. A positioning plate is fixedly connected to the plug. A rotating shaft is rotatably connected to the second limiting block. A second limiting rod is fixedly connected to the rotating shaft. A bolt is slidably connected to the second limiting rod. The bolt contacts the positioning plate and is threadedly connected to the second limiting block.
[0010] Preferably, the mounting base has a sliding groove at the corresponding position of the second limiting block, and the second limiting block slides inside the sliding groove. The second limiting block has a matching slot at the corresponding position of the insertion rod, and the insertion rod is engaged inside the slot.
[0011] Preferably, the positioning plate has a groove through which the bolt passes, and the second limiting block has a movable groove at the corresponding position of the second limiting rod, and the width of the movable groove is greater than the diameter of the second limiting rod.
[0012] The beneficial effects of this utility model are:
[0013] 1. The slider can drive the support rod to move adaptively, which can be applied to workpieces with different inner contours. The support rod supports the workpiece from the inside. The support rod and the clamping mechanism position the workpiece, which can avoid deformation caused by excessive clamping force of the clamping mechanism. This ensures the stability of the workpiece and avoids workpiece deformation, thus ensuring grinding accuracy and efficiency.
[0014] 2. The replaceable clamping blocks are suitable for workpieces of different sizes, ensuring sufficient contact area with the workpiece, thus providing sufficient friction and clamping force to guarantee workpiece stability. They can also be quickly replaced, making them more convenient to use. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0016] Figure 2 This is a cross-sectional view of the first limiting block of this utility model;
[0017] Figure 3 This is a partial structural diagram of the clamping mechanism of this utility model;
[0018] Figure 4 This is a cross-sectional view of the clamping mechanism of this utility model;
[0019] Figure 5 This is an exploded view of the clamping mechanism of this utility model.
[0020] Explanation of reference numerals in the attached drawings: 1. Mounting base; 21. First limiting block; 22. Slider; 23. Support rod; 24. First limiting rod; 25. Spring; 26. First threaded rod; 27. First external hexagonal rotating block; 31. Second threaded rod; 32. Second external hexagonal rotating block; 33. Second limiting block; 34. Insert rod; 35. Clamping block; 36. Positioning plate; 37. Rotating shaft; 38. Second limiting rod; 39. Bolt; 4. Fixing lug. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] Please see Figures 1-5 This utility model provides an embodiment of a mechanical parts grinding fixture, including a mounting base 1, a first limiting block 21, and a clamping mechanism. The mounting base 1 is provided with a clamping mechanism for clamping mechanical parts. The first limiting block 21 is slidably connected to the mounting base 1, and a slider 22 is slidably connected to the first limiting block 21. A support rod 23 for supporting the mechanical parts from the inside is fixedly connected to the top of the slider 22. Four fixing ears 4 are symmetrically arranged on the side end face of the mounting base 1. The mechanical parts are placed on the top of the mounting base 1, and several support rods 23 are selected according to the internal contour of the mechanical parts. The slider 22 is driven by the first limiting block 21, and the slider 22 drives the support rods 23 to tighten from the inside of the mechanical parts, supporting the workpiece. The support rods 23 will be appropriately displaced according to the internal contour of the mechanical parts, and then clamped from the outer surface by the clamping mechanism. The forces of the support rods 23 and the clamping mechanism cancel each other out, thereby avoiding deformation of the workpiece. The position of the mounting base 1 can be fixed by a connecting piece passing through the fixing ears 4.
[0023] Please see Figures 1-2In this embodiment, the mounting base 1 has a groove at the corresponding position of the first limiting block 21, and the first limiting block 21 slides inside the groove. The height of the groove is higher than the height of the first limiting block 21. The groove guides and limits the first limiting block 21, allowing it to slide linearly under the drive of the first threaded rod 26, preventing tilting and jamming. The first limiting block 21 being lower than the groove will not affect the placement of mechanical parts. A first limiting rod 24 is fixedly connected to the first limiting block 21 to limit the slider 22. The slider 22 is slidably connected to the first limiting rod 24. A spring 25 is fixedly connected between the slider 22 and the first limiting block 21. The mounting base 1 is internally rotatably connected to a first threaded rod 26 that drives the adjustment of the first limiting block 21. The first limiting block 21 is threadedly connected to the first threaded rod 26. The outer side of the first threaded rod 26 is fixedly connected to the first external hexagonal rotating block 27, which is rotatably connected to the mounting base 1. The slider 22 and the support rod 23 can be automatically reset by the spring 25, and the displacement can be adaptively adjusted according to the inner contour of the workpiece. Therefore, it can be applied to mechanical parts with various contours and has a wider range of applications. The first limiting block 21 has a limiting groove at the corresponding position of the slider 22, and the slider 22 slides inside the limiting groove. The slider 22 moves a short distance through the sliding groove and the first limiting rod 24. The sliding groove and the first limiting rod 24 stably limit the slider 22, so that the slider 22 will not tilt when it moves adaptively, avoid jamming, and make its movement smooth.
[0024] Please see Figure 1 , Figures 3-5In this embodiment, the clamping mechanism includes a second threaded rod 31, which is rotatably connected to the mounting base 1. A second external hexagonal rotating block 32 is fixedly connected to the outer side of the second threaded rod 31. The second external hexagonal rotating block 32 is rotatably connected to the mounting base 1. A second limiting block 33 is threadedly connected to the second external hexagonal rotating block 32. An insert rod 34 is inserted into the second limiting block 33. A clamping block 35 for clamping mechanical parts is fixedly connected to the inner side of the insert rod 34. A positioning plate 36 is fixedly connected to the insert rod 34. A rotating shaft 37 is rotatably connected to the second limiting block 33. A second limiting rod 38 is fixedly connected to the rotating shaft 37. A bolt 39 is slidably connected to the second limiting rod 38. The bolt 39 contacts the positioning plate 36 and is threadedly connected to the second limiting block 33. The workpiece can be clamped by the clamping block 35, and the detachable clamping block 35 allows selection of a suitable workpiece. The clamping block 35 ensures clamping stability and allows for easy replacement via the insertion rod 34. The mounting base 1 has a sliding groove at the corresponding position of the second limiting block 33, and the second limiting block 33 slides inside the sliding groove. The second limiting block 33 has a matching slot at the corresponding position of the insertion rod 34, and the insertion rod 34 is engaged inside the slot. The insertion rod 34 is initially positioned by the slot, and then further positioned by the positioning plate 36 and bolt 39, resulting in more stable fixation. This ensures the stability of the workpiece when clamping it. The positioning plate 36 has a groove through which the bolt 39 passes. The second limiting block 33 has a movable groove at the corresponding position of the second limiting rod 38, and the width of the movable groove is greater than the diameter of the second limiting rod 38. The movable groove provides sufficient space for the second limiting rod 38 to rotate, allowing the second limiting rod 38 to rotate the bolt 39 without affecting the disassembly of the insertion rod 34.
[0025] During operation, the connector passes through the fixing lug 4 to fix the position of the mounting base 1. Then, the workpiece is placed on the surface of the mounting base 1. Several support rods 23 are selected according to the inner contour of the workpiece. Unnecessary support rods 23 can be moved to the outermost side to avoid affecting the placement of the workpiece. When placing the workpiece, it is placed over several support rods 23. Then, the corresponding first external hexagonal rotating block 27 is turned to drive the first threaded rod 26. The first threaded rod 26 drives the first limiting block 21. The first limiting block 21 drives the slider 22. The slider 22 drives the support rod 23. The support rod 23 is tightened from the inside of the workpiece. When the support rod 23 is compressed, it slides outside the first limiting rod 24, while simultaneously compressing the spring 25. Spring 25 is used for automatic reset of slider 22, which causes support rod 23 to move a short distance, allowing support rod 23 to adapt to different workpieces. After tightening the workpiece, the second external hexagonal rotating block 32 is twisted to drive the second threaded rod 31, the second threaded rod 31 drives the second limit block 33, the second limit block 33 drives the insertion rod 34, the insertion rod 34 drives the clamping block 35, and the workpiece is clamped by the clamping block 35. The rotating bolt 39 is unscrewed from the second limit block 33, so that the bolt 39 is away from the positioning plate 36. Then the second limit rod 38 is flipped. The second limit rod 38 is limited by the rotating shaft 37. The second limit rod 38 drives the bolt 39 to flip. Then the insertion rod 34 is removed, thereby replacing the clamping block 35.
[0026] Through the above steps, the support rod 23 supports the workpiece from the inside. The support rod 23, together with the clamping mechanism, positions the workpiece to solve the problem that large clamping forces can cause deformation of hollow mechanical parts.
Claims
1. A grinding fixture for mechanical parts, comprising a mounting base (1), characterized in that: It also includes a first limiting block (21) and a clamping mechanism. The mounting base (1) is provided with a clamping mechanism for clamping mechanical parts. The first limiting block (21) is slidably connected to the mounting base (1). A slider (22) is slidably connected to the first limiting block (21). A support rod (23) that supports mechanical parts from the inside is fixedly connected to the top of the slider (22). Four fixed ears (4) are symmetrically provided on the side end face of the mounting base (1).
2. The mechanical part polishing jig according to claim 1, characterized by: The mounting base (1) has a groove at the corresponding position of the first limiting block (21), and the first limiting block (21) slides inside the groove, and the height of the groove is higher than the height of the first limiting block (21).
3. The mechanical part polishing fixture of claim 1, wherein: A first limiting rod (24) for limiting the slider (22) is fixedly connected to the first limiting block (21). The slider (22) is slidably connected to the first limiting rod (24). A spring (25) is fixedly connected between the slider (22) and the first limiting block (21). A first threaded rod (26) for driving the adjustment of the first limiting block (21) is rotatably connected inside the mounting base (1). The first limiting block (21) is threadedly connected to the first threaded rod (26). A first external hexagonal rotating block (27) is fixedly connected to the outside of the first threaded rod (26). The first external hexagonal rotating block (27) is rotatably connected to the mounting base (1).
4. The mechanical part polishing fixture of claim 3, wherein: The first limiting block (21) has a limiting groove at the corresponding position of the slider (22), and the slider (22) slides inside the limiting groove, so that the slider (22) moves a short distance through the groove and the first limiting rod (24).
5. The mechanical part polishing fixture of claim 1, wherein: The clamping mechanism includes a second threaded rod (31), which is rotatably connected to the mounting base (1). A second external hexagonal rotating block (32) is fixedly connected to the outer side of the second threaded rod (31). The second external hexagonal rotating block (32) is rotatably connected to the mounting base (1). A second limiting block (33) is threadedly connected to the second external hexagonal rotating block (32). A plug rod (34) is inserted into the second limiting block (33). A clamping block (35) for clamping mechanical parts is fixedly connected to the inner side of the plug rod (34). A positioning plate (36) is fixedly connected to the plug rod (34). A rotating shaft (37) is rotatably connected to the second limiting block (33). A second limiting rod (38) is fixedly connected to the rotating shaft (37). A bolt (39) is slidably connected to the second limiting rod (38). The bolt (39) contacts the positioning plate (36) and is threadedly connected to the second limiting block (33).
6. The mechanical part polishing fixture of claim 5, wherein: The mounting base (1) has a sliding groove at the corresponding position of the second limiting block (33), and the second limiting block (33) slides inside the sliding groove. The second limiting block (33) has a matching slot at the corresponding position of the insertion rod (34), and the insertion rod (34) is engaged inside the slot.
7. The mechanical part polishing fixture of claim 5, wherein: The positioning plate (36) has a groove, and the bolt (39) passes through the groove. The second limiting block (33) has a movable groove at the corresponding position of the second limiting rod (38), and the width of the movable groove is greater than the diameter of the second limiting rod (38).