Clamping tool for milling nuclear fuel assembly plate spring key hook

Abstract

The utility model particularly relates to a clamping tool for milling a nuclear fuel assembly plate spring key hook. The clamping tool comprises a tool base body, wherein the tool base body is fixed on a working table of a machining center through a bolt; the positioning plate is fixed on the tool base body through a bolt; two machining stations are symmetrically arranged on the two sides of the positioning plate on the tool base body. The machining station comprises a pressing handle, a first baffle, a sizing block, a pressing block, a second baffle and a cover plate. The first baffle, the second baffle and the cover plate are fixed to the tool base body through bolts, and the pressing block is fixed to the second baffle through bolts. A plate spring is clamped among the pressing block, the cover plate and the positioning plate; the cover plate is pressed on the plate spring through the pressing handle; and the sizing block is fixed on the positioning plate to position the processing surface of the plate spring. According to the utility model, stable clamping and accurate positioning of the nuclear fuel assembly plate spring are realized.

Description

Technical Field

[0001] This utility model relates to the field of nuclear fuel assembly manufacturing technology, and in particular to a clamping fixture for milling a key hook for a nuclear fuel assembly plate spring. Background Technology

[0002] Leaf springs are crucial structural components in the upper tube assembly of pressurized water reactor nuclear fuel assemblies. They primarily provide preload pressure to the fuel assemblies and compensate for the different expansion rates between the fuel assemblies and reactor internals, as well as the irradiation growth of the fuel assemblies. The leaf springs are made of Indium Kering Nickel 718 sheet metal and require multiple manufacturing processes, including milling, bending, key hook machining, heat treatment, and sandblasting. After bending, the leaf springs have a uniform width and require milling to create a key hook, a process performed on a machining center table. The leaf spring material is approximately 3.7mm thick. Due to their irregular shape, leaf springs are difficult to secure, and existing clamping fixtures suffer from low processing efficiency and low product yield due to unstable clamping and inaccurate positioning. Utility Model Content

[0003] The purpose of this utility model is to provide a clamping fixture for milling key hooks of nuclear fuel assembly plate springs. Designed based on the structural characteristics of nuclear fuel assembly plate springs, the characteristics of processing equipment, and the characteristics of processing technology, it solves the problems of low processing efficiency and low product qualification rate caused by unstable clamping and inaccurate positioning in existing clamping fixtures for milling key hooks of nuclear fuel assembly plate springs. Through the design of the fixture structure and clamping and positioning method, the nuclear fuel assembly plate spring is stably clamped and accurately positioned during the milling process of key hooks of nuclear fuel assembly plate springs, and all the processing of key hooks of nuclear fuel assembly plate springs is completed on one fixture, realizing high-efficiency and high-quality processing of key hooks of nuclear fuel assembly plate springs.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A clamping fixture for milling a key hook for a nuclear fuel assembly leaf spring includes a fixture base bolted to a machining center worktable; a positioning plate bolted to the center of the fixture base; two machining stations symmetrically arranged on both sides of the positioning plate on the fixture base; each machining station includes a clamping handle, a first baffle, a shim, a clamping block, a second baffle, and a cover plate; the first baffle, the second baffle, and the cover plate are bolted to the fixture base, and the clamping block is bolted to the second baffle; the leaf spring is clamped between the clamping block, the cover plate, and the positioning plate; the cover plate is clamped onto the leaf spring by the clamping handle; the shim is fixed to the positioning plate to position the machining surface of the leaf spring.

[0006] As one possible implementation, the clamping block is fixed to the second baffle by a fourth bolt; the second baffle is threadedly connected to the fourth bolt; tightening the fourth bolt pushes the clamping block to press against the leaf spring.

[0007] As one possible approach, the fourth bolt is supported on the second baffle by a cotter pin.

[0008] As one possible implementation, the clamping handle includes a handle and a screw fixedly connected to the handle; the center of the first baffle has a threaded through hole, and the center of the first baffle is threadedly connected to the screw; the free end of the screw passes through the center of the first baffle and is fixed to the cover plate by an elastic retaining ring; tightening the screw pushes the cover plate to press against the leaf spring.

[0009] As one possible method, the second baffle is fixed to the workstation base by the fifth bolt.

[0010] As one possible approach, the first baffle is fixed to the workstation base by the first bolt.

[0011] As one possible approach, the cover plate is fixed to the tooling base by a second bolt.

[0012] As one possible method, the positioning plate is fixed to the workstation base by a third bolt.

[0013] As one possible approach, the tooling base has U-shaped grooves at both ends, and the tooling base is fixed to the machining center worktable by U-shaped groove bolts.

[0014] One possible implementation is that the leaf spring head is fitted to the pad; the cover plate and positioning plate clamp and position the milled leaf spring.

[0015] The beneficial technical effects of this utility model are as follows:

[0016] This utility model relates to a clamping fixture for milling key hooks on nuclear fuel assembly plate springs. Designed based on the structural characteristics of nuclear fuel assembly plate springs, the characteristics of the processing equipment, and the characteristics of the processing technology, the fixture stably clamps and accurately positions the nuclear fuel assembly plate springs during the machining process, achieving high-quality machining. The fixture is divided into two machining stations, left and right. During the machining process, both sides of the key hook are machined on one fixture, completing all machining of the key hook and achieving high-efficiency machining. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of one embodiment of the leaf spring of this utility model;

[0018] Figure 2 This is a schematic diagram of one embodiment of the clamping fixture for milling a key hook for a nuclear fuel assembly plate spring according to the present invention.

[0019] In the diagram, 1. Clamping handle; 2. Tooling base; 3. First baffle; 4. First bolt; 5. Shaft retaining ring; 6. Second bolt; 7. Leaf spring; 8. Shim; 9. Positioning plate; 10. Third bolt; 12. Clamping block; 13. Fourth bolt; 14. Cotter pin; 15. Fifth bolt; 16. Second baffle; 17. Cover plate. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, it should be understood that the terms "left end," "right end," "above," "below," "outer side," "inner side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," "fourth," "fifth," etc., 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.

[0022] In this utility model, unless otherwise explicitly 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 connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] See Figure 2This embodiment provides a clamping fixture for milling a key hook for a nuclear fuel assembly plate spring. It includes a fixture base 2, which serves as the foundation for the fixture. The fixture base 2 is bolted to a machining center worktable. A positioning plate 9 is bolted to the fixture base 2. Two machining stations are symmetrically arranged on both sides of the positioning plate 9 on the fixture base 2. Each machining station includes a clamping handle 1, a first baffle 3, a pad 8, a clamping block 12, a second baffle 16, and a cover plate 17. The first baffle 3, the second baffle 16, and the cover plate 17 are bolted to the fixture base 2, and the clamping block 12 is bolted to the second baffle 16. A plate spring 7 is clamped between the clamping block 12, the cover plate 17, and the positioning plate 9. The cover plate 17 is clamped to the plate spring 7 by the clamping handle 1. The pad 8 is fixed to the positioning plate 9 to position the machining surface of the plate spring 7.

[0024] In this embodiment, as one possible method, the clamping block 12 is fixed to the second baffle 16 by the fourth bolt 13, and the second baffle 16 is used to support the clamping block 12; the second baffle 16 is threadedly connected to the fourth bolt 13; tightening the fourth bolt 13 pushes the clamping block 12 to press against the leaf spring 7.

[0025] In this embodiment, as one possible approach, the fourth bolt 13 is supported on the second baffle 16 by a cotter pin 14.

[0026] In this embodiment, as one possible method, the second baffle 16 is fixed to the workstation base 2 by the fifth bolt 15.

[0027] In this embodiment, as one possible implementation method, the clamping handle 1 includes a handle and a screw fixedly connected to the handle; the center of the first baffle 3 is provided with a threaded through hole, the center of the first baffle 3 is threadedly connected to the screw, and the first baffle 3 is used to support the screw; the free end of the screw passes through the center of the first baffle 3 and is fixed to the cover plate 17 by the axial elastic retaining ring 5; tightening the screw pushes the cover plate 17 to press against the leaf spring 7.

[0028] In this embodiment, as one possible method, the first baffle 3 is fixed to the workstation base 2 by the first bolt 4.

[0029] In this embodiment, as one possible method, the cover plate 17 is fixed to the tooling base 2 by the second bolt 6.

[0030] In this embodiment, as one possible method, the positioning plate 9 is fixed to the workstation base 2 by the third bolt 10.

[0031] In this embodiment, as one possible approach, the tooling base 2 has U-shaped grooves at both ends, and the tooling base 2 is fixed to the machining center worktable by U-shaped groove bolts.

[0032] In this embodiment, as one possible approach, the head of the leaf spring 7 is fitted and connected to the pad 8; the cover plate 17 and the positioning plate 9 clamp and position the milled position of the leaf spring 7.

[0033] The process of milling nuclear fuel assembly plate springs using a key hook milling fixture includes the following steps:

[0034] 1. Fix the tooling base 2 to the machining center worktable using U-shaped bolts;

[0035] 2. Rotate the screw and the fourth bolt 13 to press the body of the leaf spring 7 between the clamping block 12 and the positioning plate 9, so that the head of the leaf spring 7 contacts the pad 8;

[0036] 3. Rotate the screw to position the cover plate 17 and the positioning plate 9 clamping the plate spring 7 at the milling position;

[0037] 4. Use a rubber mallet to tap the bent part of the leaf spring 7 at the contact point between the pad 8 and the leaf spring 7, so that the pad 8 and the leaf spring 7 fit tightly together.

[0038] 5. Tap the leaf spring 7 towards the tooling base 2 to make the leaf spring 7 fit tightly against the tooling base 2; tighten the screw to press the cover plate 17 onto the leaf spring 7.

[0039] 6. Tighten the fourth bolt 13 to press the clamping block 12 onto the leaf spring 7, ensuring the stability of the leaf spring 7 during milling.

[0040] 7. Mill the leaf spring 7 using a machining center tool.

[0041] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A clamping fixture for milling a key hook for a nuclear fuel assembly plate spring, characterized in that, The tooling base (2) is bolted to the worktable of the machining center, and the positioning plate (9) is bolted to the tooling base (2). Two machining stations are symmetrically arranged on both sides of the positioning plate (9) on the tooling base (2). The machining station includes a clamping handle (1), a first baffle (3), a pad (8), a clamping block (12), a second baffle (16), and a cover plate (17). The first baffle (3), the second baffle (16), and the cover plate (17) are bolted to the tooling base (2), and the clamping block (12) is bolted to the second baffle (16). The leaf spring (7) is clamped between the clamping block (12), the cover plate (17), and the positioning plate (9). The cover plate (17) clamps the leaf spring (7) through the clamping handle (1). The pad (8) is fixed to the positioning plate (9) to position the machining surface of the leaf spring (7).

2. The clamping fixture for milling the key hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The clamping block (12) is fixed on the second baffle (16) by the fourth bolt (13); the second baffle (16) is threadedly connected to the fourth bolt (13); tighten the fourth bolt (13) to push the clamping block (12) to clamp the plate spring (7).

3. The clamping fixture for milling the key hook of the nuclear fuel assembly plate spring according to claim 2, characterized in that, The fourth bolt (13) is supported on the second baffle (16) by a cotter pin (14).

4. The clamping fixture for milling the key hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The clamping handle (1) includes a handle and a screw fixedly connected to the handle; the center of the first baffle (3) is provided with a threaded through hole, and the center of the first baffle (3) is threadedly connected to the screw; the free end of the screw passes through the center of the first baffle (3) and is fixed to the cover plate (17) by the shaft elastic retaining ring (5); tighten the screw and push the cover plate (17) to clamp the plate spring (7).

5. The clamping fixture for milling the key hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The first baffle (3) is fixed to the workstation base (2) by the first bolt (4).

6. The clamping fixture for milling the key hook of a nuclear fuel assembly plate spring according to claim 1, characterized in that, The second baffle (16) is fixed to the workstation base (2) by the fifth bolt (15).

7. The clamping fixture for milling the key hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The cover plate (17) is fixed to the tooling base (2) by the second bolt (6).

8. The clamping fixture for milling the key hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The positioning plate (9) is fixed to the workstation base (2) by the third bolt (10).

9. The clamping fixture for milling the key hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The tooling base (2) has U-shaped grooves at both ends, and the tooling base (2) is fixed to the machining center worktable by U-shaped groove bolts.

10. The clamping fixture for milling key hooks for nuclear fuel assembly plate springs according to any one of claims 1-9, characterized in that, The head of the leaf spring (7) is fitted and connected to the pad (8); the cover plate (17) and the positioning plate (9) clamp and position the milled position of the leaf spring (7).

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