Inner support jig
The internal support fixture adjusts the position of the support component through the driving component and the helical tooth structure, providing stable support force, solving the deformation problem of thin-walled workpieces during machining, and improving machining accuracy and surface quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN LIYU GAS CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-08-04
AI Technical Summary
Thin-walled workpieces are prone to deformation during machining due to factors such as cutting force, clamping force and cutting heat, which affects machining accuracy and surface quality.
An internal support fixture is used, and the drive shaft is driven by a drive component to move. The support component moves closer to or further away from the drive shaft under the action of the helical tooth structure, providing a stable support force and adapting to thin-walled workpieces of different sizes.
It effectively avoids deformation of thin-walled workpieces during processing, improving processing accuracy and surface quality.
Smart Images
Figure CN224587546U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of thin-walled workpiece processing, and more specifically, to an internal support fixture. Background Technology
[0002] Thin-walled workpieces are widely used in aerospace, precision instruments and other fields due to their advantages such as lightweight structure and high material utilization. These workpieces are usually characterized by small wall thickness and poor rigidity, and are easily affected by cutting forces, clamping forces and residual stress during machining.
[0003] In existing technologies, the clamping of thin-walled workpieces mainly relies on mechanical fixtures, vacuum adsorption, or magnetic fixation to achieve positioning and clamping. Mechanical fixtures apply radial or axial clamping force through jaws, but excessive clamping force can cause elastic deformation of the workpiece; vacuum adsorption is suitable for flat surfaces, but has insufficient adsorption force for complex curved surfaces; magnetic fixation is only suitable for ferromagnetic materials.
[0004] During machining, the contact between the tool and the workpiece generates dynamic cutting forces. This alternating load further exacerbates workpiece vibration and deformation. Furthermore, the cutting heat generated during machining causes localized temperature increases in the workpiece. Due to uneven heat dissipation in thin-walled structures, thermal deformation is difficult to avoid. The combined effect of these factors leads to dimensional deviations and shape instability in thin-walled workpieces during machining, severely impacting machining accuracy and surface quality. Utility Model Content
[0005] The purpose of this application is to provide an internal support fixture that can provide stable support for machining and prevent deformation of thin-walled workpieces during machining.
[0006] This utility model provides an internal support fixture, which includes a driving component, a driving shaft, support components, and a helical tooth structure. The driving component has a driving end, and the driving shaft is connected to the driving end and moves along the axial direction of the driving shaft under the action of the driving end. A plurality of support components are arranged in a circular array around the center of the driving shaft. At least one helical tooth structure is provided between each support component and the driving shaft. Under the action of the inclined surface of the helical tooth structure, the distance between the support component and the driving shaft increases or decreases.
[0007] In an optional embodiment, the helical tooth structure includes a first helical tooth and a second helical tooth, the first helical tooth being fixedly connected to the support member, the second helical tooth engaging with the inclined surface of the first helical tooth, and the second helical tooth being fixedly connected to the drive shaft.
[0008] In an optional embodiment, the first helical tooth is provided with a guide rail, the second helical tooth is provided with a slider, the slider is slidably connected to the guide rail, and the contact surface between the slider and the guide rail is inclined to the axial direction of the drive shaft.
[0009] In an optional embodiment, along the axial direction of the drive shaft, the end of the contact surface closer to the drive shaft is a first end, and the end of the contact surface farther from the drive shaft is a second end. The distance between the first end and the drive shaft is a first distance, and the distance between the second end and the drive shaft is a second distance. The first distance is greater than the second distance.
[0010] In an optional embodiment, the cross-section of the support member is arc-shaped, and the center of the support member is located in the axial direction of the drive shaft.
[0011] In an optional embodiment, adjacent supports are spaced apart.
[0012] In an optional embodiment, the internal support fixture further includes a flange and a sliding structure, wherein the flange is sleeved on the drive end and is located between the support member and the main body of the drive member, and at least one sliding structure is provided between each support member and the flange.
[0013] In an optional implementation, the number of sliding structures is the same as the number of support members and they correspond one-to-one.
[0014] In an optional embodiment, the sliding structure includes a sliding guide rail and a sliding block, the sliding block sliding relative to the sliding guide rail along the movement direction of the support member, the sliding guide rail being disposed on the flange, and the sliding block being disposed on the support member.
[0015] In an optional embodiment, the driving component is a telescopic cylinder, the driving end is the piston rod of the telescopic cylinder, and the piston rod is inserted into the driving shaft.
[0016] Compared to existing technologies, the advantages of this application are:
[0017] This application uses a driving component to drive the drive shaft to move along the axial direction of the drive shaft, thereby causing multiple support components to move closer to or further away from the drive shaft under the action of the inclined structure. This achieves the purpose of the internal support fixture providing a supporting force to thin-walled workpieces of different sizes, providing stable support force for machining and preventing deformation of thin-walled workpieces during machining. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 Schematic diagrams of the machining connection between the inner support fixture and the thin-walled workpiece are shown in some embodiments;
[0020] Figure 2 A three-dimensional structural schematic diagram of the internal support fixture in some embodiments is shown;
[0021] Figure 3 Another three-dimensional structural schematic diagram of the internal support fixture in some embodiments is shown (some components are omitted);
[0022] Figure 4 A schematic diagram of the planar structure of the internal support fixture in some embodiments is shown;
[0023] Figure 5 It shows Figure 4 Schematic diagram of the AA section;
[0024] Figure 6 It shows Figure 2 Enlarged view of section B in the middle.
[0025] Explanation of key component symbols:
[0026] 10-Inner support fixture; 100-Driver; 110-Drive end; 200-Drive shaft; 300-Support member; 310-Gap; 400-Helical tooth structure; 410-First helical tooth; 411-Guide rail; 420-Second helical tooth; 421-Slider; 401-First end; 402-Second end; 500-Flange; 600-Sliding structure; 610-Sliding guide rail; 620-Sliding block; 20-Thin-walled workpiece. Detailed Implementation
[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0032] Example 1
[0033] Please see Figure 1 This embodiment is applicable to the processing of thin-walled workpiece 20. Thin-walled workpiece 20 refers to a thin-shell workpiece with a small thickness. Due to its small thickness, the thin-walled workpiece 20 will deform during the processing, and the cutting heat will also aggravate the deformation of the thin-walled workpiece 20.
[0034] The cross-section of the thin-walled workpiece 20 can be a regular shape such as a circle or a square, or it can be an irregular shape. In this embodiment, a thin-walled workpiece 20 with a circular cross-section is used as an example, that is, the thin-walled workpiece 20 is a cylindrical structure.
[0035] Please see Figure 2 and Figure 3 This embodiment provides an internal support fixture 10, which includes a drive member 100, a drive shaft 200, a support member 300, and a helical tooth structure 400.
[0036] The driving component 100 is provided with a driving end 110. In this embodiment, the driving component 100 can be configured as a telescopic cylinder, and the driving end 110 is the piston rod of the telescopic cylinder. The piston rod extends or retracts relative to the body of the telescopic cylinder, starting from the initial position of the piston rod.
[0037] The drive shaft 200 is connected to the drive end 110 and moves along the axis of the drive shaft 200 under the action of the drive end 110. Specifically, the piston rod is inserted into the drive shaft 200. When the piston rod extends, the drive shaft 200 extends synchronously away from the drive member 100. When the piston rod retracts, the drive shaft 200 retracts synchronously towards the drive member 100.
[0038] It is understood that the aforementioned extension and retraction are relative to the body of the drive component 100. The stroke of the drive shaft 200 is determined by the stroke of the piston rod. For example, if the piston rod extends 10cm, the drive shaft 200 also extends 10cm.
[0039] In this embodiment, the drive shaft 200 can be set to be cylindrical with a circular cross-section. Multiple support members 300 are arranged in a ring array around the center of the circular cross-section of the drive shaft 200. This design improves the uniformity of mass distribution, ensuring that the drive shaft 200 and the drive end 110 rotate coaxially without wobbling.
[0040] Please see Figures 1 to 3 For the thin-walled workpiece 20 with a circular cross-section as its center, this embodiment can be configured with three support members 300, evenly distributed. Each support member 300 has an arc-shaped cross-section, and its center is located along the axis of the drive shaft 200. The multiple support members 300 form a circular outer contour. When the support members 300 support the thin-walled workpiece 20, the outer contour formed by the multiple support members 300 matches the inner wall of the thin-walled workpiece 20.
[0041] In some embodiments, the cross-section of the support member 300 is fan-shaped, which can also satisfy the condition that the outer contour is adapted to the inner wall of the thin-walled workpiece 20. Therefore, it is only necessary to set the outer contour of multiple support members 300 to be adapted to the inner wall of the thin-walled workpiece 20 to achieve the supporting function.
[0042] It is understandable that when the thin-walled workpiece 20 has other shapes, the shape of the support 300 needs to be adapted. The support 300 plays a supporting role for the thin-walled workpiece 20, and the support 300 is in direct contact with the thin-walled workpiece 20, which can transfer heat, so that the heat of the thin-walled workpiece 20 is transferred to the support 300, reducing thermal deformation.
[0043] When the piston rod is in the initial position, the support member 300 is in the initial state. The piston rod begins to extend and moves to the final position, where the support member 300 is in the final state. It can be understood that the final position can be either a non-initial position or the initial position.
[0044] In this embodiment, in the initial state, adjacent support members 300 are spaced 310 apart. In the final state, the spaced 310 between adjacent support members 300 is greater than or equal to the spaced 310 in the initial state. When the final position of the piston rod is not in the initial position, the spaced 310 between adjacent support members 300 is greater than the spaced 310 in the initial state. When the final position of the piston rod is in the initial position, the spaced 310 between adjacent support members 300 is equal to the spaced 310 in the initial state.
[0045] In this embodiment, by adding a spacing of 310 to the basic heat dissipation function of heat transfer, heat dissipation of the support 300 can be achieved, the heat dissipation efficiency of the thin-walled workpiece 20 can be improved, and the probability of thermal deformation can be reduced.
[0046] At least one helical tooth structure 400 is provided between each support member 300 and the drive shaft 200. Under the action of the inclined surface of the helical tooth structure 400, the distance between the support member 300 and the drive shaft 200 can be increased or decreased.
[0047] Please see Figure 4 and Figure 5 The helical tooth structure 400 includes a first helical tooth 410 and a second helical tooth 420. The first helical tooth 410 is fixedly connected to the support member 300, the second helical tooth 420 is engaged with the inclined surface of the first helical tooth 410, and the second helical tooth 420 is fixedly connected to the drive shaft 200.
[0048] Please see Figure 3 and Figure 4 The first helical tooth 410 is provided with a guide rail 411, and the second helical tooth 420 is provided with a slider 421. The slider 421 is slidably connected inside the guide rail 411, and the contact surface between the slider 421 and the guide rail 411 is inclined to the axial direction of the drive shaft 200.
[0049] Along the axial direction of the drive shaft 200, the end of the contact surface closer to the drive shaft 200 is the first end 401, and the end of the contact surface farther away from the drive shaft 200 is the second end 402. The distance between the first end 401 and the drive shaft 200 is the first distance, and the distance between the second end 402 and the drive shaft 200 is the second distance. The first distance is greater than the second distance.
[0050] In this embodiment, the first helical tooth 410 and the second helical tooth 420 have the same outer dimensions. That is, when the piston rod is in the initial position, the outer circumferences of the first helical tooth 410 and the second helical tooth 420 are aligned, and the distance between the support member 300 and the drive shaft 200 is the shortest. When the piston rod begins to extend, the first helical tooth 410 and the second helical tooth 420 move relative to each other, and the distance between the support member 300 and the drive shaft 200 gradually increases. Multiple support members 300 move outward in sync. When the piston rod retracts, the first helical tooth 410 and the second helical tooth 420 move in opposite directions, and the distance between the support member 300 and the drive shaft 200 gradually decreases. Multiple support members 300 move inward in sync.
[0051] Please see Figure 1 and Figure 2 In this embodiment, multiple support members 300 are expanded or contracted to match the size of the thin-walled workpiece 20, ensuring that the support members 300 are tightly held against the inner wall of the thin-walled workpiece 20, providing a stable and reliable holding force for the processing of the thin-walled workpiece 20.
[0052] Based on thin-walled workpieces 20 of different sizes, internal support fixtures 10 of different sizes can be designed, which are suitable for machining thin-walled workpieces 20 with internal hole deviations of 10mm to 20mm.
[0053] Please see Figure 1 , Figure 3 and Figure 4 Based on the above, this embodiment further explains the working principle of the internal support fixture 10 as follows:
[0054] S100. Fit the thin-walled workpiece 20 onto the support 300.
[0055] S200. Start the drive unit 100. The drive shaft 200 extends under the action of the drive unit 100, driving the second helical tooth 420 to move relative to the first helical tooth 410. The support member 300 moves outward until the support member 300 holds the thin-walled workpiece 20.
[0056] S300. Perform milling and other machining on the thin-walled workpiece 20.
[0057] S400. After the machining is completed, start the drive unit 100. The drive shaft 200 retracts under the action of the drive unit 100, which drives the second helical tooth 420 to move in the opposite direction to the first helical tooth 410. The support member 300 moves inward until it returns to the initial state.
[0058] S500. Remove the thin-walled workpiece 20.
[0059] This application uses the driving component 100 to drive the driving shaft 200 to move along the axial direction of the driving shaft 200, thereby causing multiple support components 300 to move closer to or further away from the driving shaft 200 under the action of the inclined structure. This achieves the purpose of the inner support fixture 10 providing a supporting force to thin-walled workpieces 20 of different sizes, providing stable support force for machining and preventing the thin-walled workpieces 20 from deforming during the machining process.
[0060] Example 2
[0061] Please see Figure 2 , Figure 3 and Figure 6 Based on Embodiment 1, this embodiment is improved in that the inner support fixture 10 further includes a flange 500 and a sliding structure 600. The flange 500 is sleeved on the drive end 110 and is located between the support member 300 and the main body of the drive member 100. At least one sliding structure 600 is provided between each support member 300 and the flange 500.
[0062] The number of sliding structures 600 is the same as the number of support members 300 and they correspond one-to-one. For every three support members 300, there are also three sliding structures 600, and the three sliding structures 600 are evenly arranged on the end face of the flange 500.
[0063] The sliding structure 600 includes a sliding guide rail 610 and a sliding block 620. The sliding block 620 slides relative to the sliding guide rail 610 along the movement direction of the support member 300. The sliding guide rail 610 is disposed on the flange 500, and the sliding block 620 is disposed on the support member 300.
[0064] This embodiment adds a sliding structure 600 to guide the expansion or contraction of the support member 300, preventing the support member 300 from deviating from the movement trajectory and improving the reliability and stability of this embodiment.
[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0066] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. An inner support jig characterized by, The device includes a drive component, a drive shaft, support components, and a helical gear structure. The drive component has a drive end, and the drive shaft is connected to the drive end and moves along the axial direction of the drive shaft under the action of the drive end. A plurality of support components are arranged in a circular array around the center of the drive shaft. At least one helical gear structure is provided between each support component and the drive shaft. Under the action of the inclined surface of the helical gear structure, the distance between the support component and the drive shaft can be increased or decreased.
2. The inner support jig according to claim 1, wherein The helical tooth structure includes a first helical tooth and a second helical tooth. The first helical tooth is fixedly connected to the support member, the second helical tooth engages with the inclined surface of the first helical tooth, and the second helical tooth is fixedly connected to the drive shaft.
3. The inner support jig according to claim 2, wherein The first helical tooth is provided with a guide rail, and the second helical tooth is provided with a slider. The slider is slidably connected to the guide rail, and the contact surface between the slider and the guide rail is inclined to the axial direction of the drive shaft.
4. The inner support jig according to claim 3, wherein Along the axial direction of the drive shaft, the end of the contact surface closer to the drive shaft is the first end, and the end of the contact surface farther from the drive shaft is the second end. The distance between the first end and the drive shaft is the first distance, and the distance between the second end and the drive shaft is the second distance. The first distance is greater than the second distance.
5. The inner support jig according to any one of claims 1 to 4, wherein The support member has a circular arc cross-section, and the center of the support member is located in the axial direction of the drive shaft.
6. The inner support jig according to claim 5, wherein The adjacent support members are spaced apart.
7. The inner support jig according to any one of claims 1 to 4, wherein It also includes a flange and a sliding structure, wherein the flange is sleeved on the drive end and is located between the support member and the main body of the drive member, and at least one sliding structure is provided between each support member and the flange.
8. The inner support jig according to claim 7, wherein The number of sliding structures is the same as the number of supporting members, and they correspond one-to-one.
9. The inner support jig according to claim 8, wherein The sliding structure includes a sliding guide rail and a sliding block. The sliding block slides relative to the sliding guide rail along the movement direction of the support member. The sliding guide rail is disposed on the flange, and the sliding block is disposed on the support member.
10. The inner support jig according to any one of claims 1 to 4, wherein The driving component is a telescopic cylinder, and the driving end is the piston rod of the telescopic cylinder, which is inserted into the driving shaft.