Rocket engine expansion section turning fixture
By using a bidirectional clamping system combining segmented positioning aluminum tires and clamping aluminum rings, the problem of movement of the rocket engine expansion section during processing was solved, achieving high-precision and high-efficiency processing results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU ZHONGJIA PRECISION MASCH CO LTD
- Filing Date
- 2025-08-21
- Publication Date
- 2026-07-24
AI Technical Summary
The existing machining fixtures for rocket engine expansion sections cannot effectively hold the expansion sections, causing them to easily move during machining, which affects machining accuracy and efficiency.
The system employs a combination of segmented conical positioning aluminum tires and pressing aluminum rings to create an internal and external bidirectional clamping system. By establishing a rigid reference through the supporting spindle and pressing and fixing structure, and in conjunction with the precision contour support of the positioning aluminum tires, it achieves accurate positioning and uniform clamping of the expansion section.
It achieves high-precision machining with a roundness error of ≤0.03mm, significantly improving machining accuracy and production efficiency, avoiding workpiece deformation and positioning damage, and meeting the machining requirements of high-precision thin-walled irregular parts.
Smart Images
Figure CN224543809U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rocket engine technology, and in particular to a machining tooling for the expansion section of a rocket engine. Background Technology
[0002] The rocket engine expander section is a key component of the rocket engine nozzle, located downstream of the combustion chamber. Its main function is to efficiently convert the pressure and thermal energy of the high-temperature, high-pressure combustion gases into kinetic energy through a gradually expanding geometric surface, thereby generating thrust. This component is typically made of high-strength heat-resistant alloys or composite materials to create a thin-walled structure, and its surface accuracy directly affects the engine's specific impulse and thrust efficiency. However, existing machining fixtures for rocket engine expanders still have limitations in effectively clamping the expander section, leading to potential movement issues during machining.
[0003] Therefore, it is essential to invent a machining tooling for the expansion section of a rocket engine. Utility Model Content
[0004] To address the aforementioned technical problems, this utility model provides a machining fixture for rocket engine expansion sections, solving the problem that existing machining fixtures for rocket engine expansion sections still cannot effectively clamp the rocket engine expansion, and the rocket engine expansion is prone to movement during machining. A machining fixture for rocket engine expansion sections includes a supporting main shaft, a suspension structure, an aluminum tire lifting plate, a positioning aluminum tire, an engine expansion hot-pressing component, a pressing and fixing structure, and a clamping base. The suspension structure is installed inside the supporting main shaft, and the positioning aluminum tire is slidably mounted on the supporting main shaft. The aluminum tire lifting plate is fixedly mounted on the top of the positioning aluminum tire. The engine expansion hot-pressing component is slidably mounted on the outside of the positioning aluminum tire, and the pressing and fixing structure is installed at the bottom of the supporting main shaft. The clamping base is fixedly mounted at the bottom of the pressing and fixing structure.
[0005] The positioning aluminum tire includes a bottom aluminum tire, a second aluminum tire, a third aluminum tire, and a top aluminum tire. The bottom aluminum tire, the second aluminum tire, the third aluminum tire, and the top aluminum tire are positioned by positioning pins and connected and fixed by hexagonal bolts. The bottom aluminum tire, the second aluminum tire, the third aluminum tire, and the top aluminum tire are slidably mounted on the support spindle in sequence, and the bottom aluminum tire is connected to the clamping base by hexagonal bolts.
[0006] The pressing and fixing structure includes a support base plate, a pressing aluminum ring, a pressing bolt, and a pressing nut. A support spindle is fixedly installed at the middle position of the surface of the support base plate, and the support base plate is connected and fixed to the bottom aluminum tire. The pressing aluminum ring is slidably installed on the surface of the engine expansion hot pressing component, and the support base plate and the pressing aluminum ring are connected by the pressing bolt and the pressing nut.
[0007] The positioning aluminum tire is a cone-shaped structure. The bottom aluminum tire, the second aluminum tire, the third aluminum tire and the top aluminum tire are positioned in pairs by positioning pins and then connected and fixed by bolts. During fixing, the top aluminum tire is used as the base and the tires are installed downwards in sequence, so that the bottom aluminum tire is finally connected to the pressing and fixing structure. The shape of the surface of the positioning aluminum tire matches the inner wall shape of the engine expansion hot pressing component.
[0008] The pressing and fixing structure has a set of aluminum metal rings inside, and the pressing aluminum ring has an annular groove inside that matches the curvature of the surface of the engine expansion hot press component. The pressing aluminum ring can be pressed against the support base plate by the action of the pressing bolt and the pressing nut. When the pressing aluminum ring moves, it will press the engine expansion hot press component against the support base plate and clamp the engine expansion hot press component between the support base plate and the pressing aluminum ring.
[0009] Compared with the prior art, the present invention has the following beneficial effects:
[0010] 1. The positioning aluminum tire of this utility model achieves precise fit with the inner wall of the engine expansion hot-pressing component through its segmented conical structure, providing full-surface support for the thin-walled irregular curved surface part and effectively solving the deformation problem caused by traditional clamping methods. At the same time, this component works in conjunction with the clamping aluminum ring in the pressing and fixing structure to form an internal and external bidirectional clamping system, which not only ensures clamping rigidity but also avoids over-positioning damage. Its modular design can also quickly adapt to workpieces of different specifications, significantly improving processing accuracy and production efficiency, and perfectly meeting the processing requirements of the rocket engine expansion section, a high-precision thin-walled irregular part.
[0011] 2. The pressing and fixing structure of this utility model establishes a stable benchmark through the rigid connection between the supporting base plate and the positioning aluminum tire, and drives the axial movement of the pressing aluminum ring with the help of the adjustable clamping bolt, so that its annular groove is precisely fitted with the outer curved surface of the engine expansion hot pressing part, forming a uniform and controllable radial clamping force. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model.
[0013] Figure 2 This is a structural schematic diagram of the positioning aluminum tire of this utility model.
[0014] Figure 3 This is a schematic diagram of the structure of the engine expansion hot pressing component of this utility model.
[0015] Figure 4 This is a schematic diagram of the pressing and fixing structure of this utility model.
[0016] In the picture:
[0017] Supporting main shaft 1, suspension structure 2, aluminum tire lifting plate 3, positioning aluminum tire 4, bottom aluminum tire 41, second section aluminum tire 42, third section aluminum tire 43, top aluminum tire 44, engine expansion hot pressing component 5, pressing and fixing structure 6, supporting base plate 61, pressing aluminum ring 62, pressing bolt 63, pressing nut 64, clamping base 7. Detailed Implementation
[0018] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0019] As attached Figure 1 To be continued Figure 4 As shown.
[0020] This utility model provides a machining fixture for a rocket engine expansion section, comprising a supporting main shaft 1, a suspension structure 2, an aluminum tire lifting plate 3, a positioning aluminum tire 4, an engine expansion hot pressing component 5, a pressing and fixing structure 6, and a clamping base 7. The suspension structure 2 is installed inside the supporting main shaft 1, and the positioning aluminum tire 4 is slidably installed on the supporting main shaft 1. The aluminum tire lifting plate 3 is fixedly installed on the top of the positioning aluminum tire 4. The engine expansion hot pressing component 5 is slidably installed on the outside of the positioning aluminum tire 4, and the pressing and fixing structure 6 is installed at the bottom of the supporting main shaft 1. The clamping base 7 is fixedly installed at the bottom of the pressing and fixing structure 6.
[0021] The positioning aluminum tire 4 includes a bottom aluminum tire 41, a second aluminum tire 42, a third aluminum tire 43, and a top aluminum tire 44. The bottom aluminum tire 41, the second aluminum tire 42, the third aluminum tire 43, and the top aluminum tire 44 are positioned by positioning pins and connected and fixed by hexagonal bolts. The bottom aluminum tire 41, the second aluminum tire 42, the third aluminum tire 43, and the top aluminum tire 44 are slidably mounted on the support spindle 1 in sequence, and the bottom aluminum tire 41 is connected to the clamping base 7 by hexagonal bolts.
[0022] The pressing and fixing structure 6 includes a support base plate 61, a pressing aluminum ring 62, a pressing bolt 63, and a pressing nut 64. A support spindle 1 is fixedly installed at the middle position of the surface of the support base plate 61. The support base plate 61 is connected and fixed to the bottom aluminum tire 41. The pressing aluminum ring 62 is slidably installed on the surface of the engine expansion hot press 5. The support base plate 61 and the pressing aluminum ring 62 are connected by the pressing bolt 63 and the pressing nut 64.
[0023] The positioning aluminum tire 4 is a cone-shaped structure. The bottom aluminum tire 41, the second aluminum tire 42, the third aluminum tire 43 and the top aluminum tire 44 are positioned in pairs by positioning pins and then connected and fixed by bolts. During fixing, the top aluminum tire 44 is used as the base and the parts are installed downwards in sequence, so that the bottom aluminum tire 41 is finally connected to the pressing and fixing structure 6. The shape of the surface of the positioning aluminum tire 4 matches the inner wall shape of the engine expansion hot press 5.
[0024] The pressing aluminum ring 62 inside the pressing and fixing structure 6 is a set of aluminum metal rings, and the inside of the pressing aluminum ring 62 is provided with an annular groove that matches the surface curvature of the engine expansion hot pressing component 5; the pressing aluminum ring 62 can be pressed against the support base plate 61 by the action of the pressing bolt 63 and the pressing nut 64; when the pressing aluminum ring 62 moves, it will press the engine expansion hot pressing component 5 against the support base plate 61, and clamp the engine expansion hot pressing component 5 between the support base plate 61 and the pressing aluminum ring 62.
[0025] The machining fixture for the rocket engine expansion section employs a composite clamping principle of internal support and external pressure. A rigid reference is established through the supporting spindle 1 and the pressing and fixing structure 6. Combined with the precision contour support of the segmented positioning aluminum tire 4, accurate positioning of the engine expansion hot-pressed component 5 is achieved. The clamping aluminum ring 62 generates a uniform radial clamping force through the adjustment of the clamping bolts 63, forming a bidirectional constraint with the internal positioning aluminum tire 4, ensuring clamping rigidity while preventing over-positioning damage. The synergistic effect of the suspension structure 2 and the aluminum tire lifting plate 3 further enhances system stability, enabling the thin-walled workpiece to maintain dynamic balance during high-speed cutting.
[0026] This tooling innovatively integrates modular positioning and adaptive clamping technology. The segmented design of the positioning aluminum tire 4 supports rapid changeover, and the multi-point adjustment function of the pressing and fixing structure 6 can compensate for workpiece surface tolerances. Through a triple protection mechanism—the supporting base plate 61 bearing axial force, the clamping aluminum ring 62 balancing radial force, and the positioning aluminum tire 4 suppressing deformation—the vibration control problem in the machining of large-size thin-walled curved parts has been successfully overcome. The machining accuracy can reach IT6 level, with a roundness error ≤0.03mm, significantly improving the manufacturing quality and efficiency of aerospace components.
[0027] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.
Claims
1. A machining fixture for the expansion section of a rocket engine, characterized in that: The device includes a support spindle (1), a suspension structure (2), an aluminum tire lifting plate (3), a positioning aluminum tire (4), an engine expansion hot press (5), a pressing and fixing structure (6), and a clamping base (7), wherein: the suspension structure (2) is installed inside the support spindle (1), and the positioning aluminum tire (4) is slidably installed on the support spindle (1), and the aluminum tire lifting plate (3) is fixedly installed on the top of the positioning aluminum tire (4); the engine expansion hot press (5) is slidably installed on the outside of the positioning aluminum tire (4), and the pressing and fixing structure (6) is installed at the bottom of the support spindle (1), and the clamping base (7) is fixedly installed at the bottom of the pressing and fixing structure (6).
2. The machining fixture for the rocket engine expansion section as described in claim 1, characterized in that: The positioning aluminum tire (4) includes a bottom aluminum tire (41), a second aluminum tire (42), a third aluminum tire (43), and a top aluminum tire (44). The bottom aluminum tire (41), the second aluminum tire (42), the third aluminum tire (43), and the top aluminum tire (44) are positioned by positioning pins and connected and fixed by hexagonal bolts. The bottom aluminum tire (41), the second aluminum tire (42), the third aluminum tire (43), and the top aluminum tire (44) are slidably mounted on the support spindle (1) in sequence, and the bottom aluminum tire (41) is connected to the clamping base (7) by hexagonal bolts.
3. The machining fixture for the rocket engine expansion section as described in claim 1, characterized in that: The pressing and fixing structure (6) includes a support base plate (61), a pressing aluminum ring (62), a pressing bolt (63), and a pressing nut (64). A support spindle (1) is fixedly installed at the middle position of the surface of the support base plate (61). The support base plate (61) is connected and fixed to the bottom aluminum tire (41). The pressing aluminum ring (62) is slidably installed on the surface of the engine expansion hot press (5). The support base plate (61) and the pressing aluminum ring (62) are connected by the pressing bolt (63) and the pressing nut (64).
4. The machining fixture for the rocket engine expansion section as described in claim 2, characterized in that: The positioning aluminum tire (4) is a cone-shaped structure. The bottom aluminum tire (41), the second aluminum tire (42), the third aluminum tire (43) and the top aluminum tire (44) are positioned in pairs by positioning pins and then connected and fixed by bolts. When fixing, the top aluminum tire (44) is used as the base and installed downwards in sequence, so that the bottom aluminum tire (41) is finally connected to the pressing and fixing structure (6). The shape of the surface of the positioning aluminum tire (4) matches the inner wall shape of the engine expansion hot press component (5).
5. The machining fixture for the rocket engine expansion section as described in claim 3, characterized in that: The pressing aluminum ring (62) inside the pressing and fixing structure (6) is a set of aluminum metal rings, and the pressing aluminum ring (62) has an annular groove inside that matches the surface curvature of the engine expansion hot press (5); the pressing aluminum ring (62) can be pressed against the support base plate (61) by the action of the pressing bolt (63) and the pressing nut (64); when the pressing aluminum ring (62) moves, it will press the engine expansion hot press (5) against the support base plate (61) and clamp the engine expansion hot press (5) between the support base plate (61) and the pressing aluminum ring (62).