Machining tool for nuclear fuel assembly plate spring positioning hook arc
By designing a machining fixture for the arc of the positioning hook of the nuclear fuel assembly leaf spring, and using a combination of hook rod limiting post and clamping block for fixation, the problems of vibration and tool wear during the leaf spring machining process were solved, achieving high-precision and high-efficiency machining results.
Patent Information
- Application Number
- CN202422936033.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-29
AI Technical Summary
During the machining of the arc of the positioning hook for the plate spring of the nuclear fuel assembly, there are problems such as tool vibration leading to dimensional deviations and severe tool wear, which increases tool costs.
A machining fixture for the arc of the positioning hook of a nuclear fuel assembly leaf spring was designed, including a fixture base and a positioning unit. The combination of hook rod limiting post, positioning post and clamping block can reliably fix the leaf spring and avoid vibration during the machining process.
It effectively avoids workpiece vibration during processing, reduces tool wear, improves processing accuracy and pass rate, and reduces tool replacement frequency and cost.
Smart Images
Figure CN223544691U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nuclear fuel assembly manufacturing, and in particular to a machining tooling for the arc of the positioning hook of a nuclear fuel assembly plate spring. Background Technology
[0002] Leaf springs 8, made of Inconel 718 high-temperature alloy, are installed in the upper tube seat of the AP1000 fuel assembly and CAP1400 fuel assembly. One type of leaf spring has a positioning hook arc located at the T-shaped end of the positioning hook rod. The two sides of the "∣" structure in the T-shape are arcs. During machining, the arc needs to be machined with an end mill. During the machining process, tool vibration will occur, resulting in dimensional deviations and aggravating tool wear. Frequent tool changes are required, which increases tool costs. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a machining fixture for the arc of the positioning hook of the nuclear fuel assembly plate spring, which reliably fixes the plate spring, avoids vibration during the machining process, and reduces tool wear.
[0004] This utility model provides a machining fixture for the arc of the positioning hook of a nuclear fuel assembly plate spring, including:
[0005] Tooling base and positioning unit;
[0006] The positioning unit includes a hook rod limiting post and a positioning post;
[0007] The hook rod limiting post and positioning post are fixed on the tooling base.
[0008] The hook rod clamping block fixes the positioning hook rod of the leaf spring onto the hook rod limiting post;
[0009] The hook rod limiting block is connected to the top of the hook rod limiting post to position the positioning hook rod of the leaf spring;
[0010] The clamping block is connected to the positioning post to clamp and fix the main body of the leaf spring.
[0011] In one specific embodiment of this utility model, a plurality of positioning units are provided on the tooling base.
[0012] In one specific embodiment of this utility model, a positioning hook rod embedding groove is provided on the side wall of the hook rod limiting post, and the hook rod pressing block is provided on both sides of the positioning hook rod embedding groove;
[0013] The positioning hook rod of the leaf spring is embedded in the positioning hook rod embedding groove. Tighten the hook rod clamping block connecting bolts on both sides to clamp the positioning hook rod.
[0014] In one specific embodiment of this utility model, the hook rod limiting block is fastened to the back of the hook rod limiting post by bolts, thereby bypassing the machining path of the cutting tool.
[0015] In one specific embodiment of this utility model, when installing the leaf spring, the T-shaped structure of the positioning hook rod abuts against the bottom of the hook rod limiting block.
[0016] In one specific embodiment of this utility model, the clamping block passes through one side of the positioning post, the leaf spring body is placed between the positioning post and the clamping block, and then the clamping block connecting bolt is tightened to clamp the leaf spring body.
[0017] In one specific embodiment of this utility model, the distance between the hook rod limiting post and the positioning post satisfies the inclination angle of the leaf spring's inclined surface and the requirements of the leaf spring's movement space at two structural locations.
[0018] Compared with existing technologies, the machining fixture for the locating hook arc of the nuclear fuel assembly leaf spring of this invention can quickly clamp the workpiece, expose the area of the workpiece to be machined, and avoid tool interference. It can stably fix the leaf spring during machining, solving the problem of workpiece vibration. The machined leaf spring fully meets the requirements of the drawings and technical specifications. This fixture has been applied to the mass production of leaf springs, possesses engineering processing capabilities, and produces stable product quality. Attached Figure Description
[0019] Figure 1 This diagram shows the structure of a leaf spring.
[0020] Figure 2 A side view showing the tooling for machining the arc of the leaf spring positioning hook;
[0021] Figure 3 A top view showing the tooling for machining the arc of the leaf spring positioning hook;
[0022] Figure 4 A schematic diagram showing the structure of the tooling for machining the arc of the leaf spring positioning hook;
[0023] Figure 5 A schematic diagram showing the structural connection between the hook rod limiting post and the hook rod limiting block;
[0024] Figure 6 A schematic diagram showing the connection between the hook rod limiting post and the hook rod clamping block;
[0025] Figure 7 This diagram illustrates the connection between the clamping block and the positioning column.
[0026] In the diagram, 1-the arc of the leaf spring positioning hook, 2-the tooling base, 3-the hook rod limiting post, 4-the hook rod limiting block, 5-the clamping block, 6-the hook rod clamping block, 7-the positioning post, and 8-the leaf spring. Detailed Implementation
[0027] To further understand this utility model, the embodiments of this utility model are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting this utility model.
[0028] Figure 1 In the diagram, the arc 1 of the leaf spring positioning hook is the part that needs to be machined for the product.
[0029] An embodiment of this utility model discloses a machining fixture for the arc of the positioning hook of a nuclear fuel assembly plate spring, such as... Figures 2-7 As shown, it includes: tooling base 2 and positioning unit;
[0030] Several sets of positioning units are provided on the tooling base.
[0031] The positioning unit includes a hook rod limiting post 3 and a positioning post 7;
[0032] The hook rod limiting post 3 and positioning post 7 are fixed on the tooling base, and bolt connection can be used;
[0033] The hook rod clamping block 6 fixes the positioning hook rod of the leaf spring 8 onto the hook rod limiting post 3;
[0034] Specifically, a positioning hook rod embedding groove is provided on the side wall of the hook rod limiting post 3, and the hook rod pressing block 6 is provided on both sides of the positioning hook rod embedding groove;
[0035] The positioning hook rod of the leaf spring 8 is embedded in the positioning hook rod embedding groove. Tighten the connecting bolts of the hook rod clamping blocks 6 on both sides to clamp the positioning hook rod, which plays a limiting role in the positioning hook rod of the leaf spring 8.
[0036] The hook rod limiting block 4 is connected to the top of the hook rod limiting post 3 to position the positioning hook rod of the leaf spring 8;
[0037] The hook rod limiting block 4 is fastened to the back of the hook rod limiting post 3 by bolts, thereby bypassing the machining path of the tool. When installing the leaf spring 8, the T-shaped end face of the positioning hook rod abuts against the bottom of the hook rod limiting block 4, which plays a positioning role for the positioning hook rod of the leaf spring 8.
[0038] The clamping block 5 is connected to the positioning post 7 to clamp and fix the main body of the leaf spring 8.
[0039] Specifically, the clamping block 5 is installed on one side of the positioning post 7, the main body of the leaf spring 8 is placed between the positioning post 7 and the clamping block 5, and then the connecting bolts of the clamping block 5 are tightened to clamp the main body of the leaf spring 8.
[0040] The distance between the hook rod limiting post 3 and the positioning post 7 satisfies the tilt angle of the inclined surface of the leaf spring 8 and the requirements of the leaf spring 8 in the two structural movement spaces, while avoiding structural conflicts between the positioning post 7 and the hook rod limiting post 3.
[0041] In summary, the tooling of this utility model uses the inclined surface of the leaf spring, the plane of the positioning hook rod, and the T-shaped end face for positioning. The leaf spring body is fixed and tightened by the clamping block 5, and the positioning hook rod is fixed and clamped by the hook rod clamping block 6. The positioning hook rod is vertically clamped, and the machining surface is perpendicular to the cutting direction of the milling cutter. This ensures that the part to be machined is in an easy-to-machine position and ensures the stability of the clamping. It solves the problems of workpiece vibration, rapid tool wear, and out-of-tolerance precision during the machining process.
[0042] The working principle of the machining fixture for the arc of the positioning hook of the nuclear fuel assembly plate spring of this utility model is as follows:
[0043] Step 1: Install the machining fixture onto the machining center worktable using bolts.
[0044] Step 2: Loosen the bolts of the clamping block 5 and press the main body of the leaf spring 8 between the clamping block 5 and the positioning post 7.
[0045] Step 3: Loosen the bolts of the hook rod clamping block 6, and insert the positioning hook rod of the leaf spring 8 into the hook rod limiting post 3, thus fixing the hook rod limiting post 3 and achieving positioning. This ensures the processing accuracy and product consistency.
[0046] Step 4: Tighten the bolts on the hook rod clamping block 6 to clamp the leaf spring 8 and the positioning hook rod.
[0047] Step 5: Use a machining center tool to machine the arc 1 of the leaf spring positioning hook. The tool rotates 90° on each side of the positioning hook rod according to the programmed CNC program to complete the machining.
[0048] This invention solves the problem of leaf spring vibration during processing by vertically clamping the leaf spring positioning hook and using the side edge of a milling cutter for machining, thus ensuring machining accuracy and improving the pass rate and efficiency of machining.
[0049] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A machining fixture for the arc of the positioning hook of a nuclear fuel assembly plate spring, characterized in that, include: Tooling base and positioning unit; The positioning unit includes a hook rod limiting post and a positioning post; The hook rod limiting post and positioning post are fixed on the tooling base. The hook rod clamping block fixes the positioning hook rod of the leaf spring onto the hook rod limiting post; The hook rod limiting block is connected to the top of the hook rod limiting post to position the positioning hook rod of the leaf spring; The clamping block is connected to the positioning post to clamp and fix the main body of the leaf spring.
2. The machining fixture for the arc of the positioning hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, Several sets of positioning units are provided on the tooling base.
3. The machining fixture for the arc of the positioning hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The side wall of the hook rod limiting post is provided with a positioning hook rod embedding groove, and the hook rod clamping block is provided on both sides of the positioning hook rod embedding groove; The positioning hook rod of the leaf spring is embedded in the positioning hook rod embedding groove. Tighten the hook rod clamping block connecting bolts on both sides to clamp the positioning hook rod.
4. The machining fixture for the arc of the positioning hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The hook rod limiting block is fastened to the back of the hook rod limiting post by bolts, thereby bypassing the machining path of the cutting tool.
5. The machining fixture for the arc of the positioning hook of the nuclear fuel assembly plate spring according to claim 4, characterized in that, When installing the leaf spring, the T-shaped end face of the positioning hook rod rests against the bottom of the hook rod limiting block.
6. The machining fixture for the arc of the positioning hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The clamping block is installed on one side of the positioning post, the leaf spring body is placed between the positioning post and the clamping block, and then the clamping block connecting bolts are tightened to clamp the leaf spring body.
7. The machining fixture for the arc of the positioning hook of the nuclear fuel assembly plate spring according to claim 1, characterized in that, The distance between the hook rod limiting post and the positioning post satisfies the inclination angle of the leaf spring's inclined surface and the requirements of the leaf spring's movement space at two structural locations.