Sectional elastic centering clamp for thin-wall part
By using a segmented elastic centering fixture for thin-walled parts in conjunction with a chuck, the problem of insufficient clamping force caused by the taper and roundness errors of the inner hole during the machining of the outer diameter of thin-walled parts is solved. This achieves a fixture design that allows for tight fit of the inner hole and can be adjusted, thereby improving product quality and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU HAONENG TECH CO LTD
- Filing Date
- 2025-04-14
- Publication Date
- 2026-04-28
AI Technical Summary
When machining the outer diameter of thin-walled parts, the taper and roundness errors of the inner hole cause poor fit between the expansion sleeve and the inner hole of the workpiece, resulting in insufficient clamping force. This leads to slippage of the product during machining, inability to guarantee concentricity, and the inability to repair the expansion sleeve after wear, affecting product quality and cost.
The thin-walled segmented elastic centering fixture includes multiple sets of elastic clamping components and positioning blocks, which cooperate with the chuck. Through the coaxial design of the elastic clamping components and the inner hole, segmented clamping is achieved, avoiding hard clamping deformation, and the worn elastic clamping blocks can be repaired.
It achieves tight fit and centering of the inner hole of thin-walled parts, avoids slippage, ensures processing quality, and reduces tooling costs and improves product qualification rate through the adjustability of elastic clamps.
Smart Images
Figure CN224168757U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of clamping technology, and more specifically, to a segmented elastic centering clamp for thin-walled parts. Background Technology
[0002] When machining the outer diameter of a thin-walled part, there are dimensional requirements for the roundness of the outer diameter and its concentricity with the inner hole.
[0003] like Figure 5 As shown, during product machining, a common method is to use internal hole and end face positioning, along with simultaneous expansion of the internal hole for clamping. While this method achieves internal hole centering, the workpiece's internal hole has taper and roundness errors. This clamping method often results in insufficient clamping force after the expansion sleeve expands due to poor contact between the outer circle of the expansion sleeve and the workpiece's internal hole caused by the taper of the internal hole. Subsequently, during machining the outer diameter of the workpiece, slippage occurs due to machining resistance. This causes the workpiece to move during machining, compromising the product's concentricity. Furthermore, due to the roundness error of the workpiece's internal hole, the workpiece deforms under the hard contact clamping of the expansion sleeve. The product is rounded by the expansion sleeve; after machining, when the expansion sleeve is released, the outer diameter of the workpiece will rebound to its original state, resulting in unqualified roundness. Ultimately, the machined product is defective or even scrapped, significantly reducing the pass rate and increasing costs.
[0004] In summary, the existing clamping methods have the following drawbacks:
[0005] Defect 1: The long positioning surface of the expansion sleeve makes it difficult to load and unload workpieces, affecting efficiency.
[0006] Defect 2: The integral structure expansion sleeve cannot be repaired after wear, and the finished products cannot meet the quality requirements after losing its positioning function, resulting in high tooling costs.
[0007] Defect 3: The integral expansion sleeve cannot fully fit the inner hole of the product, resulting in insufficient clamping force. This causes the product to slip and shift during processing, making it impossible to ensure the concentricity of the workpiece and rendering the product unusable.
[0008] Defect 4: Springback deformation occurs after the workpiece is turned, and the roundness of the outer circle cannot be guaranteed; Utility Model Content
[0009] The technical problem to be solved by this utility model is to provide a segmented elastic centering fixture for thin-walled parts;
[0010] The solution adopted by this utility model to solve the technical problem is:
[0011] A segmented elastic centering fixture for thin-walled parts, used in conjunction with a chuck, is used for machining the outer diameter of thin-walled parts with inner holes. It includes multiple sets of elastic clamping members mounted on the chuck and driven by the chuck, and a positioning block mounted on the chuck and positioned between adjacent sets of elastic clamping members. An installation gap is formed between the inner side of the positioning block and the outer side of the elastic clamping member; multiple sets of installation gaps are sequentially connected to form an annular installation cavity; a gap is formed between adjacent sets of elastic clamping members; the inner sides of the multiple sets of elastic clamping members cooperate to form an inner cavity communicating with the gap and coaxial with the inner hole.
[0012] In some possible implementations, the elastic clamping member includes a reference mounting member mounted on the chuck and engaging with the chuck in a driving manner, and an elastic clamping block mounted on the reference mounting member; an installation gap is formed between the outer side of the elastic clamping block and the inner side of the positioning block.
[0013] In some possible implementations, the elastic clamping block includes a fixing block mounted on a reference mounting member, an abutment portion that mates with the inner wall of the inner hole of the thin-walled member, and a connecting portion disposed between the abutment portion and the fixing block;
[0014] The fixing block, the abutment part, and the connecting part are connected in sequence and integrally formed; a groove is provided on the outside of the connecting part and along the circumference of the inner hole.
[0015] In some possible implementations, the abutment portion is segmented; an axial through hole is provided on the fixing block along the axial direction of the inner hole; a through hole with its axis along the axial direction of the inner hole is provided on the connecting portion; and an axial groove communicating with the through hole is provided on the connecting portion.
[0016] The axis of the through hole, the axis of the axial through hole, the central axis of the inner cavity, and the center of the axial groove are on the same plane; this plane divides the corresponding elastic clamps into two equal parts.
[0017] In some possible implementations, the thickness of the fixing block along the inner hole axis is C, the thickness of the connecting part along the inner hole axis is D, and the thickness of the connecting part along the inner hole axis is E; wherein, C > D, E > D.
[0018] In some possible implementations, a plurality of gaps A are provided on the outer side of the abutting portion along the axis of the inner hole, and a hole A is provided on the connecting portion corresponding to the plurality of gaps A and whose axis is arranged along the axial direction of the inner hole.
[0019] In some possible implementations, when the inner hole is a cylindrical hole, the outer surface of the abutment is arc-shaped and the circle is concentric with the center of the inner hole; multiple sets of grooves are connected in sequence to form an annular groove, the opening of which is located on the side close to the thin-walled part; the annular mounting cavity is annular.
[0020] In some possible implementations, the elastic clamping elements are in three sets, and the cross-section of the inner cavity is an equilateral triangle.
[0021] In some possible implementations, the positioning block has an L-shaped cross-section and includes a support plate located at the bottom of the elastic clamping member and connected to the chuck, and an end face abutment plate mounted on the support plate with its inner side forming an installation gap with the elastic clamping member; the top surface of the end face abutment plate abuts against the outer circle of the end of the thin-walled member.
[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0023] This invention can effectively achieve a tight fit with the inner hole of a thin-walled part, thus ensuring concentricity; during use, it does not cause the thin-walled part to be stretched into a round shape due to overall hard clamping, and the product will spring back after processing, thus ensuring that the processing quality requirements are met.
[0024] After the elastic clamping block in this invention is worn, its outer circle can be repeatedly repaired; and by adjusting and controlling the tensioning stroke of the elastic clamping block, tooling failure can be avoided, and the processing quality requirements of thin-walled parts can be met.
[0025] In this invention, each set of elastic clamping blocks is segmented, and compensation dimensions can be designed to achieve complete fit and clamping with the inner hole, thus achieving accurate centering. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of this utility model;
[0027] Figure 2 This is a cross-sectional view of the present invention;
[0028] Figure 3 This is a schematic diagram of the elastic clamping component in this utility model;
[0029] Figure 4 This is a schematic diagram showing the connection relationship between the present invention and the thin-walled component;
[0030] Figure 5 This is the positioning and clamping method used in existing technologies;
[0031] Among them: 1. Elastic clamping component; 11. Reference mounting component; 12. Elastic clamping block; 110. Inner cavity; 120. Gap; 121. Fixing block; 1211. Axial through hole; 122. Connecting part; 1221. Through hole; 123. Abutting part; 1231. Axial groove; 1232. Gap A; 1233. Groove; 2. Positioning block; 21. Support plate; 22. End face abutment plate; 3. Thin-walled component. Detailed Implementation
[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "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 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. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] The present invention will now be described in detail.
[0034] The thin-walled component 3 has a cylindrical inner hole inside, and the cross-section of the thin-walled component 3 is cylindrical;
[0035] like Figures 1-4 As shown; a segmented elastic centering jig for thin-walled parts, used in conjunction with a chuck, for machining the outer diameter of a thin-walled part 3 with an inner hole; comprising multiple sets of elastic clamping members 1 mounted on the chuck and driven by the chuck, and positioning blocks 2 mounted on the chuck and positioned between adjacent sets of elastic clamping members 1; an installation gap is formed between the inner side of the positioning block 2 and the outer side of the elastic clamping member 1, and multiple sets of installation gaps are connected in sequence to form an annular installation cavity; a gap 120 is formed between adjacent sets of elastic clamping members 1; the inner sides of the multiple sets of elastic clamping members 1 cooperate to form an inner cavity 110 that communicates with the gap 120 and is coaxial with the inner hole;
[0036] The elastic clamping member 1 is connected to the jaws of the chuck; the positioning block 2 is connected to the chuck body; the positioning block 2 is located between two adjacent sets of jaws on the chuck; a large gap is formed between the two sets of positioning blocks 2, and the bottom of the elastic clamping member 1 passes through the large gap and connects with the jaws.
[0037] In use, the thin-walled part 3 is installed in the arc-shaped mounting cavity, and the side of the thin-walled part 3 near the chuck abuts against the top of the positioning block 2. During processing, the chuck drives the elastic clamping part 1 to move radially along the inner hole, which increases the gap 120 between two adjacent sets of elastic clamping parts 1, thereby increasing the size of the inner cavity 110, so that the outer side of the elastic clamping part 1 abuts against the inner sidewall of the inner hole, and the thin-walled part 3 is positioned and clamped. Then, the chuck controls the elastic clamping part 1 to rotate around the axis of the inner hole, thereby realizing the outer circle machining of the thin-walled part 3.
[0038] In some possible implementations, in order to effectively connect the elastic clamping member 1 with the chuck, so that the elastic clamping member 1 can effectively clamp and fix the thin-walled part 3, the elastic clamping member 1 includes a reference mounting member 11 mounted on the chuck and in drive cooperation with the chuck, and an elastic clamping block 12 mounted on the reference mounting member 11; an installation gap is formed between the outer side of the elastic clamping block 12 and the inner side of the positioning block 2; the reference mounting member 11 is connected to the jaws by bolts, and the positioning block 2 is connected to the chuck body by bolts;
[0039] The elastic clamp has good elastic potential energy and can deform; it can be made of rubber material.
[0040] In some possible implementations, the elastic clamp 12 includes a fixing block 121 mounted on a reference mounting member 11, an abutment portion 122 that cooperates with the inner wall of the inner hole of the thin-walled member 3, and a connecting portion 122 disposed between the abutment portion 122 and the fixing block 121.
[0041] The fixing block 121, the abutment part 122, and the connecting part 122 are connected in sequence and integrally formed; a groove 1233 is provided on the outer side of the connecting part 122 and along the circumference of the inner hole; to reduce its contact area with the thin-walled part 3 and avoid deformation after machining, which would lead to difficulty in removing the part; the elastic clamping part 1 is in three sets, and the cross section of the inner cavity 110 is an equilateral triangle.
[0042] In some possible embodiments, the abutment portion is segmented; an axial through hole 1211 is provided on the fixing block 121 along the axial direction of the inner hole; a through hole 1221 with its axis arranged along the axial direction of the inner hole is provided on the connecting portion 122; an axial groove 1231 communicating with the through hole 1221 is provided on the connecting portion 122.
[0043] The axis of the through hole 1221, the axis of the axial through hole 1211, the central axis of the inner cavity 110, and the center of the axial groove 1231 are on the same plane. This plane divides the corresponding elastic clamping block 12 into two parts, realizing a segmented design. This avoids the situation where the thin-walled part 3 cannot fit tightly due to the inconsistency of the taper and roundness of the inner hole and the deformation of the thin-walled part 3 during the turning process. The segmented design allows for the design of compensation dimensions to achieve complete fitting and clamping with the inner hole, achieving accurate centering. This ensures a tight fit with the inner hole of the thin-walled part, prevents slippage, and meets product quality requirements.
[0044] In some possible implementations, the thickness of the fixing block 121 along the inner hole axis is C, the thickness of the connecting part 122 along the inner hole axis is D, and the thickness of the connecting part 122 along the inner hole axis is E; wherein, C > D, E > D; thereby making the elastic clamping block 12 have good elasticity and able to achieve tensioning of the thin-walled part 3.
[0045] Preferably, C=E>D.
[0046] In some possible implementations, a number of gaps A1232 are provided on the outer side of the abutting part 122 along the axis of the inner hole, and holes A are provided on the connecting part 122 corresponding to the number of gaps A1232 and whose axes are arranged along the axial direction of the inner hole. This effectively avoids hard contact between the outer side of the elastic clamping block 12 and the inner wall, causing the thin-walled part 3 to become rounded. It also makes it easier to separate the entire clamp from the thin-walled part 3, making loading and unloading convenient and avoiding deformation of the thin-walled part 3 due to uneven force.
[0047] In some possible implementations, when the inner hole is a cylindrical hole, such as Figure 1 , Figure 3 , Figure 4 As shown, the outer surface of the abutment part 122 is arc-shaped and the circle is concentric with the center of the inner hole; multiple sets of grooves 1233 are connected in sequence to form an annular groove, the opening of which is located on the side close to the thin-walled part 3; the annular mounting cavity is annular.
[0048] In some possible implementations, the positioning block 2 has an L-shaped cross section and includes a support plate 21 located at the bottom of the elastic clamping member 1 and connected to the jaws in the chuck, and an end face abutment plate 22 mounted on the support plate 21 with an installation gap between its inner side and the elastic clamping member 1; the top surface of the end face abutment plate 22 abuts against the outer circle of the end of the thin-walled member 3 near the chuck.
[0049] The installation gaps include gap one formed with the outer side of the elastic clamp 12 and gap two formed with the outer side of the reference mounting member 11; gap one is located above gap two, and when the thin-walled member 3 is tensioned, the width of gap one is smaller than that of gap two.
[0050] The improvement of this utility model is no longer that the chuck controls the reference mounting part 11 to move radially along the inner hole and the elastic clamp 12 to rotate around the axis of the inner hole, so its internal structure will not be described in detail.
[0051] This invention can effectively fit and clamp the inner hole of a thin-walled part in sections, achieving accurate centering. A gap A1232 is set on the elastic clamping block 123 to achieve flexible clamping of the workpiece, preventing it from being forcibly clamped and stretched, which can greatly improve product quality.
[0052] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.
Claims
1. A segmented elastic centering fixture for thin-walled parts, used in conjunction with a chuck, for machining the outer diameter of thin-walled parts with internal holes; characterized in that, It includes multiple sets of elastic clamping members mounted on the chuck and engaging with the chuck's drive mechanism; a positioning block mounted on the chuck and positioned between two adjacent sets of elastic clamping members; an installation gap is formed between the inner side of the positioning block and the outer side of the elastic clamping member; multiple sets of installation gaps are sequentially connected to form an annular installation cavity; a gap is formed between two adjacent sets of elastic clamping members; the inner sides of the multiple sets of elastic clamping members engage to form an inner cavity that communicates with the gap and is coaxial with the inner hole.
2. The segmented elastic centering fixture for thin-walled parts according to claim 1, characterized in that, The elastic clamping component includes a reference mounting component mounted on the chuck and engaging with the chuck in a driving manner, and an elastic clamping block mounted on the reference mounting component; an installation gap is formed between the outer side of the elastic clamping block and the inner side of the positioning block.
3. A segmented elastic centering fixture for thin-walled parts according to claim 2, characterized in that, The elastic clamping block includes a fixing block mounted on a reference mounting member, an abutting part that mates with the inner wall of the inner hole of the thin-walled member, and a connecting part disposed between the abutting part and the fixing block; The fixing block, the abutment part, and the connecting part are connected in sequence and integrally formed; a groove is provided on the outside of the connecting part and along the circumference of the inner hole.
4. A segmented elastic centering fixture for thin-walled parts according to claim 3, characterized in that, The abutting part is segmented; an axial through hole is provided on the fixing block along the axial direction of the inner hole; a through hole with its axis along the axial direction of the inner hole is provided on the connecting part; an axial groove communicating with the through hole is provided on the connecting part. The axis of the through hole, the axis of the axial through hole, the central axis of the inner cavity, and the center of the axial groove are on the same plane; this plane divides the corresponding elastic clamps into two equal parts.
5. A segmented elastic centering fixture for thin-walled parts according to claim 3, characterized in that, The thickness of the fixing block along the inner hole axis is C, the thickness of the connecting part along the inner hole axis is D, and the thickness of the connecting part along the inner hole axis is E; wherein, C > D, E > D.
6. A segmented elastic centering fixture for thin-walled parts according to claim 3, characterized in that, Several sets of gaps A are provided on the outer side of the abutting part along the axis of the inner hole, and holes A are provided on the connecting part corresponding to the several sets of gaps A and whose axes are arranged along the axial direction of the inner hole.
7. A segmented elastic centering fixture for thin-walled parts according to claim 3, characterized in that, When the inner hole is a cylindrical hole, the outer surface of the abutment part is arc-shaped and the circle is concentric with the center of the inner hole; multiple sets of grooves are connected in sequence to form an annular groove, and its opening is located on the side close to the thin-walled part; the annular mounting cavity is annular.
8. A segmented elastic centering fixture for thin-walled parts according to any one of claims 1-7, characterized in that, The elastic clamping members are in three sets, and the cross-section of the inner cavity is an equilateral triangle.
9. A segmented elastic centering fixture for thin-walled parts according to any one of claims 1-7, characterized in that, The positioning block has an L-shaped cross-section and includes a support plate located at the bottom of the elastic clamping member and connected to the chuck, and an end face abutment plate mounted on the support plate with an installation gap between its inner side and the elastic clamping member; the top surface of the end face abutment plate abuts against the outer circle of the end of the thin-walled member.