Clamping device for thin-wall part machining
By designing the fixture, core shaft and pressure ring structure in the clamping device, the deformation and clamping problems in the processing of thin-walled quartz parts are solved, high-precision and low-risk processing effects are achieved, and the processing efficiency and tooling interchangeability are improved.
Patent Information
- Application Number
- CN202422681198.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-04
AI Technical Summary
Quartz thin-walled parts are easily deformed during processing, resulting in low processing efficiency. In addition, small thin-walled parts are difficult to clamp and are easily crushed, and the fixture design is not convenient for disassembly.
A clamping device is designed, including a fixture, a core shaft, a base and a pressure ring. The core shaft is fixedly connected to the base, and the pressure ring presses the fixture to form multiple clamping blocks that enclose the positioning through hole, ensuring the concentricity of the workpiece and the fixture, reducing vertical clamping deviation, and avoiding horizontal crushing. The core shaft and fixture are interchangeable to adapt to changes in outer diameter.
It effectively reduces the clamping deviation in the vertical direction, prevents the workpiece from tilting less than 3um, improves processing accuracy and efficiency, reduces the risk of workpiece being crushed, and improves the interchangeability of tooling.
Smart Images
Figure CN223353663U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical element processing, in particular to a clamping device for processing thin-walled parts. Background Art
[0002] When machining thin-walled quartz parts, considerations must be taken into account, including selecting the appropriate tool, performing the correct clamping, determining machining parameters, and cooling methods. Deformation of thin-walled quartz parts during machining is a major concern. Because the material itself is thin, it is easily affected by factors such as cutting forces and heat. Furthermore, considering the impact of deformation, the amount of deformation must be controlled, resulting in low machining efficiency. Therefore, machining efficiency must be improved while ensuring quality. Furthermore, machining small thin-walled quartz parts is more difficult for the following reasons:
[0003] Due to their brittleness, quartz parts require grinding during machining. This involves grinding the material with abrasive grains embedded in the front edge of the drill. When the abrasive grains come into contact with the quartz material, vertical and tangential stresses are generated. When these stresses exceed the material's fracture limit, fracture begins.
[0004] Clamping of small thin-walled parts before processing is critical. First, it is necessary to ensure that the workpiece can be clamped. Second, deformation caused by clamping must be avoided, which may result in the thin-walled parts being of qualified size when processed on the equipment but unqualified size after the parts are removed. Finally, the design of the fixture should facilitate the disassembly of small thin-walled parts. Utility Model Content
[0005] In response to the problems in the background technology, the present invention proposes a clamping device for processing thin-walled parts, which reduces the clamping deviation of the workpiece in the vertical direction and avoids the risk of the thin-walled parts being crushed in the horizontal direction.
[0006] The utility model adopts the following technical solutions:
[0007] A clamping device for processing thin-walled parts, comprising a clamp, a core shaft, a base and a pressure ring.
[0008] The top surface of the fixture is provided with a positioning through hole that cooperates with the core shaft, and the side wall of the fixture is circumferentially provided with a plurality of first side grooves that are connected to the positioning through hole. The first side grooves extend upward to penetrate the top surface of the fixture, so that the fixture forms a structure consisting of a plurality of clamping blocks connected at the bottom.
[0009] The upper portion of the inner side wall of the pressure ring forms a first tapered surface that is smaller at the top and larger at the bottom, and the top portion of the outer side wall of the clamp forms a second tapered surface that matches the first tapered surface. The top portion of the clamp is press-connected with the pressure ring through the cooperation of the first tapered surface and the second tapered surface, so that the multiple clamping blocks enclose the positioning through hole.
[0010] The top surface of the base is provided with a receiving groove that cooperates with the lower part of the clamp, the lower part of the clamp is placed in the receiving groove, the core shaft is passed through the positioning through hole, and its lower end is detachably connected to the base after passing through the positioning through hole; the top surface of the core shaft and the top side wall surface of the positioning through hole enclose a crimping space at the lower part of the thin-walled part; the lower part of the pressure ring is detachably connected to the upper part of the base.
[0011] Optionally, a second side groove communicating with the positioning through hole is formed on the surface of the clamping block, the second side groove extends downward to the bottom surface of the penetrating clamp, and the second side groove extends upward to the middle of the second tapered surface.
[0012] Optionally, a portion of the outer side wall of the clamp located below the second conical surface forms a third conical surface that is larger at the top and smaller at the bottom.
[0013] Optionally, an annular groove is provided on the outer wall of the clamp, and the annular groove is located between the second conical surface and the third conical surface; a stop ring is provided on the inner wall of the pressure ring below the first conical surface, and after the clamp and the pressure ring are crimped, the stop ring is located in the annular groove.
[0014] Optionally, an internal thread is provided on the lower portion of the inner wall of the pressure ring, and a first external thread matching the internal thread is provided on the upper outer wall of the base. The lower portion of the pressure ring is threadably connected to the upper portion of the base through the matching of the internal thread and the first external thread.
[0015] Optionally, a threaded hole is provided on the bottom surface of the accommodating groove, a second external thread matching the threaded hole is provided on the lower portion of the core shaft, and the lower portion of the core shaft extends into the threaded hole to thread the core shaft to the base.
[0016] Optionally, the middle part of the core shaft extends radially outward to form a step shaft section, the bottom surface of the accommodating groove is provided with a step groove that cooperates with the step shaft section, the lower part of the step shaft section is clamped in the step groove, and the threaded hole is provided on the bottom surface of the step groove.
[0017] Optionally, the center of the top surface of the base protrudes upward to form a boss, and the accommodating groove is opened at the center of the top surface of the boss.
[0018] Optionally, a plurality of circumferentially spaced bolt holes are provided on the edge of the base for fixing to the processing equipment.
[0019] Optionally, the outer side wall of the pressure ring is provided with a slot for engaging with a tightening tool, and a plurality of slots are provided, and the plurality of slots are arranged at intervals along the circumference of the pressure ring.
[0020] Compared with the prior art, the advantages of the present invention are:
[0021] This clamping device for thin-walled workpiece machining employs a design that securely connects the mandrel to the base and compresses the fixture via a pressure ring, ensuring that the fixture tightly grips the mandrel and the workpiece resting on its top surface. This ensures concentricity between the workpiece and the fixture, reduces vertical clamping deviation, and prevents the workpiece from being distorted, allowing the vertical tilt of the workpiece to be less than 3 μm. Furthermore, the mandrel bears the majority of the clamping force, while the thin-walled workpiece only bears the torsional forces generated during machining, thus avoiding the risk of horizontal crushing. Furthermore, changes in the workpiece's outer diameter require only the replacement of the mandrel and fixture, significantly improving interchangeability. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to make the present invention more easily understood, the present invention will be described in more detail with reference to the specific embodiments shown in the accompanying drawings. These drawings only depict typical embodiments of the present invention and should not be considered as limiting the scope of protection of the present invention.
[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of a clamping device for thin-walled workpiece processing according to an embodiment of the present utility model, which clamps a thin-walled workpiece.
[0024] Figure 2 This is a schematic diagram of the exploded structure of a clamping device for processing thin-walled parts according to an embodiment of the present utility model.
[0025] Figure 3 This is a schematic cross-sectional view of a clamping device for processing thin-walled parts according to an embodiment of the present invention.
[0026] Figure 4 This is a schematic cross-sectional view of another direction of the clamping device for processing thin-walled parts according to an embodiment of the present invention.
[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the clamp according to an embodiment of the present utility model.
[0028] Reference numerals:
[0029] 1. Thin-walled part; 2. Mandrel; 21. Step shaft section; 22. Second external thread; 3. Clamp; 31. Positioning through hole; 32. First side groove; 33. Clamping block; 34. Second conical surface; 35. Second side groove; 36. Third conical surface; 37. Ring groove; 4. Pressing ring; 41. First conical surface; 42. Stop ring; 43. Internal thread; 44. Clamping groove; 5. Base; 51. Accommodating groove; 52. First external thread; 53. Threaded hole; 54. Step groove; 55. Boss; 56. Bolt hole. DETAILED DESCRIPTION
[0030] The following describes the implementation methods of the present invention with reference to the accompanying drawings so that those skilled in the art can better understand the present invention and implement it. However, the enumerated embodiments are not intended to limit the present invention. Unless there is a conflict, the following embodiments and the technical features in the embodiments can be combined with each other, and the same components are represented by the same figure marks.
[0031] like Figure 1-Figure 5 As shown, the clamping device for thin-walled workpiece processing of this embodiment includes a clamp 3, a core shaft 2, a base 5 and a pressure ring 4.
[0032] The top surface of the clamp 3 is provided with a positioning through hole 31 that cooperates with the core shaft 2. The side wall of the clamp 3 is circumferentially spaced apart with a plurality of first side grooves 32 that communicate with the positioning through hole 31. The first side grooves 32 extend upward to penetrate the top surface of the clamp 3, so that the clamp 3 forms a structure consisting of a plurality of clamping blocks 33 connected at the bottom.
[0033] The upper portion of the inner wall of the pressure ring 4 forms a first tapered surface 41 that is smaller at the top and larger at the bottom. The top portion of the outer wall of the clamp 3 forms a second tapered surface 34 that cooperates with the first tapered surface 41. The top portion of the clamp 3 is press-fitted to the pressure ring 4 through the cooperation of the first tapered surface 41 and the second tapered surface 34, so that the multiple clamping blocks 33 enclose and form the positioning through hole 31.
[0034] The top surface of the base 5 is provided with a receiving groove 51 that cooperates with the lower part of the clamp 3. The lower part of the clamp 3 is placed in the receiving groove 51, and the core shaft 2 is passed through the positioning through hole 31. The lower end of the core shaft 2 is detachably connected to the base 5 after passing through the positioning through hole 31; the top surface of the core shaft 2 and the top side wall of the positioning through hole 31 enclose a crimping space at the lower part of the thin-walled part 1; the lower part of the pressure ring 4 is detachably connected to the upper part of the base 5.
[0035] Therefore, by designing a fixed connection between the mandrel 2 and the base 5, and by compressing the clamp 3 with the pressure ring 4, the clamp 3 is made to tightly embrace the mandrel 2 and the thin-walled part 1 on the top surface of the mandrel 2, thereby ensuring the concentricity of the thin-walled part 1 and the clamp 3, reducing the vertical clamping deviation, and preventing the thin-walled part 1 from being clamped crooked, so that the vertical inclination of the thin-walled part 1 can be less than 3μm. In this structure, the mandrel 2 bears most of the clamping force, and the thin-walled part 1 only bears the torsional force generated during processing, avoiding the risk of it being crushed in the horizontal direction. Moreover, when the outer diameter of the workpiece changes, only the mandrel and the clamp 3 need to be replaced, greatly improving interchangeability.
[0036] In this embodiment, a second side groove 35 communicating with the positioning through hole 31 is formed on the surface of the clamping block 33 . The second side groove 35 extends downward to penetrate the bottom surface of the clamp 3 and extends upward to the middle of the second tapered surface 34 .
[0037] The middle section of the assembly between the mandrel 2 and the fixture 3 is designed to avoid air gaps, which increases the front-end clamping force of the mandrel 2 and the thin-walled workpiece 1. This allows the mandrel 2 to bear most of the clamping force (the thin-walled workpiece 1 made of quartz only bears a torque of approximately 10 N·m generated during processing). This reduces the overall contact area between the fixture 3 and the mandrel 2, thereby preventing the thin-walled workpiece 1 from being crushed in the X and Y directions.
[0038] In this embodiment, the portion of the outer wall of the clamp 3 below the second tapered surface 34 forms a third tapered surface 36 that is larger at the top and smaller at the bottom.
[0039] In this embodiment, an annular groove 37 is formed on the outer wall of the clamp 3, and the annular groove 37 is located between the second tapered surface 34 and the third tapered surface 36. A stop ring 42 is provided on the inner wall of the pressure ring 4, below the first tapered surface 41. After the clamp 3 and the pressure ring 4 are crimped together, the stop ring 42 is located in the annular groove 37. The stop ring can prevent the clamp from axial displacement during workpiece machining.
[0040] In this embodiment, an internal thread 43 is provided on the lower portion of the inner wall of the pressure ring 4, and a first external thread 52 that cooperates with the internal thread 43 is provided on the upper outer wall of the base 5. The lower portion of the pressure ring 4 is threadably connected to the upper portion of the base 5 through the cooperation between the internal thread 43 and the first external thread 52.
[0041] In this embodiment, a threaded hole 53 is provided on the bottom surface of the accommodating groove 51, and a second external thread 22 is provided on the lower part of the core shaft 2 to cooperate with the threaded hole 53. The lower part of the core shaft 2 extends into the threaded hole 53 to enable the core shaft 2 to be threadedly connected to the base 5.
[0042] The core shaft and the base are connected by threads, which is not only convenient for disassembly but also can stabilize the clamping torque.
[0043] In this embodiment, the middle part of the core shaft 2 extends radially outward to form a stepped shaft section 21, and the bottom surface of the accommodating groove 51 is provided with a stepped groove 54 that cooperates with the stepped shaft section 21. The lower part of the stepped shaft section 21 is clamped in the stepped groove 54, and the threaded hole 53 is provided on the bottom surface of the stepped groove 54.
[0044] The detachable thread design and the step positioning make it easy to screw the core shaft 2 into or out of the base 5, which can ensure accuracy and has the advantage of simple interchangeability.
[0045] In this embodiment, the center of the top surface of the base 5 protrudes upward to form a boss 55 , and the receiving groove 51 is defined at the center of the top surface of the boss 55 .
[0046] In this embodiment, a plurality of bolt holes 56 arranged at circumferential intervals are formed on the edge of the base 5 for fastening to the processing equipment.
[0047] In this embodiment, a slot 44 for engaging with a tightening tool is formed on the outer side wall of the pressure ring 4 . There are a plurality of slots 44 , which are arranged at intervals along the circumference of the pressure ring 4 .
[0048] The process of the clamping device of this embodiment clamping the thin-walled part 1 is as follows:
[0049] 1) First, the top end of the clamp 3 is pressed into the pressing ring 4 through the cooperation of the first tapered surface 41 and the second tapered surface 34;
[0050] 2) Insert the lower end of the core shaft 2 through the receiving groove 51 of the base and then extend it into the threaded hole 53. The second external thread 22 cooperates with the threaded hole 53 to achieve a threaded connection between the core shaft 2 and the base 5.
[0051] 3) Insert the upper portion of the mandrel 2 into the positioning through-hole 31 of the fixture 3, and then spin the pressing ring 4. Through the cooperation of the internal thread 43 and the first external thread 52, the pressing ring 4 is threadedly connected to the base 5. At this time, the top surface of the mandrel 2 and the top side wall of the positioning through-hole 31 enclose a crimping space at the lower portion of the thin-walled part 1;
[0052] 4) The thin-walled part 1 is then pressed into the crimping space, and the processing of the thin-walled part 1 can then be carried out.
[0053] By using the clamping device of the present invention, the shape processing of the annular groove 1 and the upper surface of the thin-walled part 1 can be achieved, such as processing the upper surface into an ultra-smooth plane or curved surface; if the pressure ring 4 is loosened and the thin-walled part 1 is placed in reverse, the processing of the other side can be achieved. The repeated clamping operation is simple, and the operation based on the same set of clamping devices introduces small errors and high processing accuracy.
[0054] The clamping device allows the outer diameter of the processed quartz thin-walled part 1 to vary within the range of D3-D16 mm. In this case, only the core shaft 2 and the clamp 3 need to be replaced, and the tooling has high interchangeability.
[0055] The embodiments described above are merely preferred embodiments of the present invention. The phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments" used in this specification may refer to one or more of the same or different embodiments of the present disclosure. Any common changes and substitutions made by those skilled in the art within the scope of the present invention are intended to be encompassed within the scope of protection of the present invention.
Claims
1. A clamping device for thin-walled workpiece processing, characterized in that: It includes a fixture (3), a core shaft (2), a base (5) and a pressure ring (4), The top surface of the clamp (3) is provided with a positioning through hole (31) that cooperates with the core shaft (2), and the side wall of the clamp (3) is provided with a plurality of first side grooves (32) that are connected to the positioning through hole (31) at intervals in the circumferential direction. The first side grooves (32) extend upward to penetrate the top surface of the clamp (3), so that the clamp (3) forms a structure consisting of a plurality of clamping blocks (33) connected at the bottom. The upper portion of the inner wall of the pressure ring (4) forms a first tapered surface (41) that is smaller at the top and larger at the bottom, and the top end of the outer wall of the clamp (3) forms a second tapered surface (34) that matches the first tapered surface (41). The top end of the clamp (3) is press-connected with the pressure ring (4) through the matching of the first tapered surface (41) and the second tapered surface (34), so that the plurality of clamping blocks (33) enclose and form the positioning through hole (31). The top surface of the base (5) is provided with a receiving groove (51) that cooperates with the lower part of the clamp (3), the lower part of the clamp (3) is placed in the receiving groove (51), the core shaft (2) is passed through the positioning through hole (31), and its lower end is detachably connected to the base (5) after passing through the positioning through hole (31); the top surface of the core shaft (2) and the top side wall surface of the positioning through hole (31) enclose a crimping space at the lower part of the thin-walled part (1); the lower part of the pressure ring (4) is detachably connected to the upper part of the base (5).
2. The clamping device for thin-walled workpiece processing according to claim 1, characterized in that: The surface of the clamping block (33) is provided with a second side groove (35) connected to the positioning through hole (31), the second side groove (35) extends downward to the bottom surface of the clamp (3), and the second side groove (35) extends upward to the middle of the second tapered surface (34).
3. The clamping device for thin-walled workpiece processing according to claim 2, characterized in that: The portion of the outer side wall of the clamp (3) located below the second conical surface (34) forms a third conical surface (36) that is larger at the top and smaller at the bottom.
4. The clamping device for thin-walled workpiece processing according to claim 3, characterized in that: The outer side wall of the clamp (3) is provided with an annular groove (37), and the annular groove (37) is located between the second conical surface (34) and the third conical surface (36); the inner side wall of the pressure ring (4) is provided with a stop ring (42) below the first conical surface (41), and after the clamp (3) and the pressure ring (4) are crimped, the stop ring (42) is located in the annular groove (37).
5. The clamping device for thin-walled workpiece processing according to any one of claims 1 to 4, characterized in that: An internal thread (43) is provided on the lower portion of the inner side wall of the pressure ring (4), and a first external thread (52) is provided on the upper outer side wall of the base (5) to cooperate with the internal thread (43). The lower portion of the pressure ring (4) is threadably connected to the upper portion of the base (5) through the cooperation between the internal thread (43) and the first external thread (52).
6. The clamping device for thin-walled workpiece processing according to any one of claims 1 to 4, characterized in that: A threaded hole (53) is provided on the bottom surface of the receiving groove (51), a second external thread (22) matching the threaded hole (53) is provided on the lower portion of the core shaft (2), and the lower portion of the core shaft (2) extends into the threaded hole (53) so that the core shaft (2) is threadedly connected to the base (5).
7. The clamping device for thin-walled workpiece processing according to claim 6, characterized in that: The middle portion of the core shaft (2) extends radially outward to form a stepped shaft section (21); the bottom surface of the accommodating groove (51) is provided with a stepped groove (54) that cooperates with the stepped shaft section (21); the lower portion of the stepped shaft section (21) is clamped in the stepped groove (54); and the threaded hole (53) is provided on the bottom surface of the stepped groove (54).
8. The clamping device for thin-walled workpiece processing according to any one of claims 1 to 4, characterized in that: The center of the top surface of the base (5) protrudes upward to form a boss (55), and the accommodating groove (51) is opened at the center of the top surface of the boss (55).
9. The clamping device for thin-walled workpiece processing according to any one of claims 1 to 4, characterized in that: The edge of the base (5) is provided with a plurality of bolt holes (56) arranged at intervals in the circumferential direction for being fixedly connected to the processing equipment.
10. The clamping device for thin-walled workpiece processing according to any one of claims 1 to 4, characterized in that: The outer side wall of the pressure ring (4) is provided with a clamping groove (44) for clamping with a tightening tool. There are a plurality of clamping grooves (44), and the plurality of clamping grooves (44) are arranged at intervals along the circumference of the pressure ring (4).