Clamp for machining connecting handle

Abstract

The utility model discloses a connecting handle machining fixture, which is used for clamping an integrated star-shaped frame connecting handle to be machined, the star-shaped frame connecting handle to be machined comprises a central cylinder, a wing plate part and an outer fixing ring, the fixture comprises a main plate, a plurality of clamping parts and a plurality of clamping parts, the main plate is provided with a machining hole, and the outer diameter of the machining hole is smaller than the outer diameter of the outer fixing ring and not smaller than the inner diameter of the outer fixing ring; the pressing assembly is arranged on the main plate, and the pressing assembly can be matched with the outer fixing ring so that the star-shaped frame connecting handle to be machined can be pressed above the main plate; and the supporting assembly is detachably connected with the main plate, and the supporting assembly can bear the bottom of the star-shaped frame connecting handle from the position below the machining hole. The clamp is matched with a novel machining method, deformation of cut products can be reduced, and product manufacturing precision is improved.

Description

Technical Field

[0001] The utility model relates to the manufacturing field of nuclear fuel related components, in particular to a fixture for machining a connecting handle. Background Art

[0002] The control rod assembly in nuclear fuel-related components mainly controls the reactivity of the core by inserting or withdrawing the control rods from the fuel assembly. The control rod assembly in the STEP series of nuclear fuel-related components includes an integrated star-shaped frame connection handle, which is a brand-new product of independent design. The STEP star-shaped frame connection handle adopts an integrated design, consisting of a central tube and 3 types of 16 radial wing plates. Due to the long length and thin thickness of the wing plates, the positioning and size requirements of the wing plates are relatively high during processing. In the existing integrated star-shaped frame connection handle processing technology, after all the wing plates are directly cut by wire, the brazing surface, bevel and fillet of the wing plates are then milled and finished. After the finishing is completed, the wing plates are easily deformed, resulting in unstable product dimensions.

[0003] We use a new method to manufacture STEP integrated spider shanks. The specific process flow is as follows: 1) rough machining of the blank; 2) wire cutting of the wing panels; 3) stress-relieving heat treatment; 4) fine machining of the wing panels and shank; 5) wire cutting of the wing panels; 6) fine milling of the wing panel radius and weld area; 7) wire cutting of the external retaining ring. This process leaves a retaining ring around the outside of the wing panel after wire cutting. The wing panel radius and weld area are then fine-machined. Finally, the external retaining ring is removed using wire cutting. The presence of the external retaining ring significantly reduces deformation of the integrated spider during milling and turning, allowing for precise control of the dimensions of the integrated spider shank after wire cutting.

[0004] Prior art CN112475734A discloses an integrated connecting handle assembly welding fixture, which includes a support component, a positioning component, and a locking component. The upper end of the support component is threadedly connected to the positioning component, and the locking component passes through the center of the positioning component and is connected to the positioning component. This fixture cannot be used in the manufacturing process of the connecting handle.

[0005] Prior art CN213592665U discloses a water jet cutting fixture for a connecting handle, comprising a locking screw, a base, a tensioning rod, a protective bushing, a positioning base plate, a clamping bolt, a positioning pin, a clamping block, and a cover plate. The tensioning rod has a threaded hole at its bottom end, which is inserted into the center hole of the base. The locking screw is inserted into the base and the tensioning rod. The cover plate is threaded onto the top of the tensioning rod and tightened to secure the protective bushing. The positioning pin is fixed to the positioning base plate, and the clamping bolt is inserted into the clamping block, which is then screwed into the positioning base plate. This fixture has a complex structure and is cumbersome to install. It is also not suitable for manufacturing an integrated star-shaped connecting handle using the new method.

[0006] In view of the above technical problems, the present utility model is introduced. Summary of the Invention

[0007] The main purpose of the utility model is to provide a fixture for machining a connecting handle, which is used to design a new cutting fixture for a new integrated star frame machining manufacturing method.

[0008] In order to achieve the above-mentioned purpose, the present invention proposes a fixture for machining a connecting handle, which is used to clamp an integrated star-shaped connecting handle to be machined. The star-shaped connecting handle to be machined includes a central tube, a wing plate portion, and an outer fixing ring. The fixture includes:

[0009] a main board, wherein the main board has a machining hole, wherein the outer diameter of the machining hole is smaller than the outer diameter of the outer fixing ring and is not smaller than the inner diameter of the outer fixing ring;

[0010] A pressing assembly, the pressing assembly being arranged on the main board and being capable of cooperating with the outer fixing ring to press the spider connecting handle to be processed onto the main board;

[0011] A support assembly is detachably connected to the main board, and the support assembly can support the bottom of the star frame connecting handle from below the processing hole.

[0012] Furthermore, the support assembly includes a support arm and a connecting block and a supporting block respectively located at both ends of the support arm, the connecting block is connected to the bottom surface of the main board, the support block is located on the axis of the processing hole and cooperates with the bottom of the center tube.

[0013] Furthermore, after processing, the wing plate portion includes a plurality of wing plates located in the circumferential direction of the central tube, and the support arm passes through a position between two adjacent wing plates.

[0014] Furthermore, the support block includes a first columnar portion and a second columnar portion, the first columnar portion is located above the second columnar portion and is coaxially arranged, and the diameter of the first columnar portion is smaller than that of the second columnar portion.

[0015] Furthermore, the clamping assembly includes a pad and a pressure block, two or more pads are respectively connected to the main board, the pressure block is detachably connected to the pad, and at least part of the bottom of the pressure block is pressed together with the upper surface of the outer fixing ring.

[0016] Furthermore, three fastener holes are arranged along the length direction on the pad, and the fastener holes on both sides are connected to the main board through fasteners. The length direction of the pressure block is perpendicular to the pad, and the pressure block is connected to the fastener hole in the middle position through fasteners.

[0017] Furthermore, the main board is provided with two or more first positioning pin holes, and the outer fixing ring is correspondingly provided with two or more second positioning pin holes, and both the first positioning pin holes and the second positioning pin holes are matched with pins.

[0018] Furthermore, the pin is a cylindrical stepped pin, and the outer diameter of the processed hole is the same as the inner diameter of the outer fixing ring.

[0019] Furthermore, a fixture reference hole is provided on the main board, and the fixture reference hole is located outside the outer fixing ring in the radial direction.

[0020] Furthermore, the mainboard is provided with a plurality of fixing holes, through which the mainboard is fixed to the machining equipment.

[0021] The application of the technical solution of the utility model achieves at least the following beneficial effects:

[0022] 1. The fixture of the present application can realize the upward installation of the center tube of the star-shaped frame connecting handle to be processed by setting a main board, a clamping assembly and a flexibly installed support assembly, and meet the cutting requirements of the wing plate and the outer fixing ring, which greatly simplifies the structure of the fixture and makes the installation steps simpler.

[0023] 2. The fixture of the present application is designed with a specific structure of the support assembly and a matching structure with the bottom of the center tube, so that the support assembly will not be cut during the cutting process of the outer fixing ring, and the entire star frame connecting handle can be stably supported during the cutting process of the outer fixing ring.

[0024] 3. The clamp of the present application is designed with a structure of a clamping assembly, so that the clamp can fix the star-shaped frame connecting handle to be processed very simply and firmly, and will not cause any influence during the entire wire cutting process.

[0025] 4. The fixture of this application is designed with positioning pin holes and pins so that the repeated positioning error of the product after clamping does not exceed 0.03mm. Combined with the new processing method, it can reduce the deformation of the product after cutting and improve the product manufacturing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting part of the present invention are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 A schematic diagram of a clamp according to an embodiment is shown;

[0028] Figure 2 A top view of a mainboard according to an embodiment is shown;

[0029] Figure 3 A schematic diagram of a support assembly according to an embodiment is shown;

[0030] Figure 4 A schematic diagram of a backing plate according to an embodiment is shown;

[0031] Figure 5 A schematic diagram of a compact according to an embodiment is shown;

[0032] Figure 6 A diagram showing the clamping of a spider connecting handle wing plate before rough cutting according to one embodiment is shown;

[0033] Figure 7 A diagram showing the clamping of the spider connecting handle wing plate after rough cutting in one embodiment is shown;

[0034] Figure 8 A diagram showing the clamping of the outer fixing ring of the star frame connecting handle before cutting is shown in one embodiment;

[0035] Figure 9 A schematic diagram of the cutting route for the outer fixing ring of the star frame connecting handle is shown;

[0036] Figure 10 A schematic diagram of the finished spider connection handle is shown.

[0037] The above drawings include the following reference numerals:

[0038] 1. Center tube; 2. Wing plate portion; 21. Wing plate; 3. Outer fixing ring; 31. Second positioning pin hole; 4. Main plate; 41. Processing hole; 42. First positioning pin hole; 43. Fixture reference hole; 44. Fixing hole; 45. Pad mounting hole; 46. Connecting block mounting hole; 5. Clamping assembly; 51. Pad; 52. Pressing block; 53. Fastener hole; 6. Support assembly; 61. Connecting block; 62. Support arm; 63. Support block; 64. First columnar portion; 65. Second columnar portion; 7. Pin. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] The present invention is further described in detail below with reference to specific embodiments. These embodiments are not to be construed as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the presence of a feature, but does not exclude the presence or addition of one or more other features; the terms "lateral", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for ease of description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be construed as limiting the present invention; in addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance.

[0041] In this description, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediary, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0042] Example:

[0043] The utility model proposes a fixture for machining a connecting handle, such as Figure 1 As shown, it is used to clamp the integrated star-shaped connecting handle to be processed and perform wire cutting on the machine tool. Figure 6 The figure shows a schematic diagram of a spider connection handle blank being clamped on a fixture. The blank includes a center tube 1, a wing plate portion 2, and an outer retaining ring 3. After the spider connection handle blank is processed by wire cutting, the outer retaining ring 3 is cut as a whole, and the wing plate portion 2 is processed into multiple wing plates 21 located circumferentially of the center tube 1. The final spider connection handle is as shown in FIG. Figure 10 shown.

[0044] Specifically, the clamp proposed in this application includes a main plate 4, a clamping assembly 5, and a support assembly 6. The main plate 4 has a machined hole 41, which is an area that can be cut by a wire cutting machine. The outer diameter of the machined hole 41 is smaller than the outer diameter of the outer retaining ring 3 and not smaller than the inner diameter of the outer retaining ring 3. Preferably, the outer diameter of the machined hole 41 is the same as the inner diameter of the outer retaining ring 3.

[0045] This enables the spider connecting handle blank to be processed to be placed on the main board 4. The pressing assembly 5 is provided on the main board 4, and the pressing assembly 5 can cooperate with the outer fixing ring 3 to press the spider connecting handle to be processed onto the main board 4.

[0046] Combine Figure 3 As shown, the support assembly 6 is detachably connected to the bottom surface of the main board 4, so that the support assembly 6 can support the bottom of the star frame connecting handle from below the processing hole 41. The support assembly 6 includes a support arm 62 and a connecting block 61 and a support block 63 located at both ends of the support arm 62. Figure 2 As shown, the connecting block 61 is fixedly connected to the bottom surface of the main board 4 through the connecting block mounting hole 46 on the main board, and the supporting block 63 is located on the axis of the processing hole 41 and cooperates with the bottom of the central tube 1.

[0047] Preferably, the support block 63 includes a first columnar portion 64 and a second columnar portion 65. The first columnar portion 64 is located above the second columnar portion 65 and is coaxially arranged. The diameter of the first columnar portion 64 is smaller than that of the second columnar portion 65. This ensures that the support block 63 and the bottom of the spider connecting handle always maintain a relatively stable fit.

[0048] Combine Figure 4 and Figure 5 As shown, the clamping assembly 5 includes a pad 51 and a pressure block 52. Two or more pads 51 are fixedly connected to the main board 4 through the pad mounting holes 45 respectively, and the pressure block 52 is detachably connected to the pad 51. At least a portion of the bottom of the pressure block 52 is pressed tightly against the upper surface of the outer fixing ring 3 to press the star frame connecting handle to be processed onto the main board.

[0049] Preferably, three fastener holes 53 are arranged along the length of the backing plate 51. The fastener holes 53 on both sides are connected to the main plate 4 via fasteners. The length of the pressure block 52 is perpendicular to the backing plate 51 and is fastened to the fastener hole 53 in the middle position via fasteners. The structure of the clamping assembly is designed to make the fixture very simple and stable to fix the spider connecting handle to be processed, and it will not affect the entire wire cutting process.

[0050] In some other embodiments, a clamping assembly 5 with a different structural design may be used, and the fixing method may be changed, such as using a side top block method, or changing the fixing method to reserving a fixed locking hole at the position of the outer fixing ring.

[0051] Combine Figure 1 、 Figure 2 and Figure 6 As shown, the main board 4 is provided with two or more first positioning pin holes 42 , and the outer fixing ring 3 is correspondingly provided with two or more second positioning pin holes 31 . Both the first positioning pin holes 42 and the second positioning pin holes 31 cooperate with the pins 7 .

[0052] Preferably, the pin 7 is a cylindrical stepped pin with slightly different diameters at the upper and lower ends, which respectively cooperates with the first positioning pin hole 42 and the second positioning pin hole 31 to achieve positioning between the main board 4 and the star-shaped frame connecting handle to be processed. The repeated positioning error after the product is clamped does not exceed 0.03mm.

[0053] In addition, the main plate 4 is provided with a fixture reference hole 43, radially outside the outer retaining ring 3. The wire cutting machine uses this hole to determine the fixture's reference. The main plate 4 is also provided with multiple fixing holes 44, which secure the main plate 4 to the machining equipment. Preferably, the main plate is a rectangular plate with four fixing holes 44 evenly spaced at its four corners.

[0054] The specific implementation process is as follows: Figure 6-Figure 8 As shown, after the spider connecting handle blank to be processed is clamped using the fixture of the present application, the machining steps are the wing plate rough cutting step, the wing plate fine cutting step, and the outer retaining ring cutting step. During the wing plate cutting step, the support assembly 6 is not installed to avoid affecting the cutting of the wing plate. The support assembly 6 is installed before the outer retaining ring cutting step.

[0055] First, the star-shaped connecting handle blank to be processed is positioned and mounted on the main plate 4 using two pins 7 before rough cutting of the wing panels. Once positioned, the pressing block 52 is attached to the backing plate 51 using fasteners to secure the star-shaped connecting handle blank to the fixture. For the 16 wing panels 21 to be cut, 16 threaded holes are reserved in the star-shaped connecting handle blank during the rough cutting step. Sixteen fan-shaped cutting pieces are then removed using wire cutting to achieve the rough cutting of the 16 wing panels. During the fine wire cutting step, the star-shaped connecting handle cut pieces are assembled in the same manner as before the rough cutting step, and wire cutting is used to achieve precise cutting of the wing panel thickness. This results in the formation of 16 wing panels 21 circumferentially around the center tube 1.

[0056] Before cutting the outer retaining ring, milling and turning are required to complete the finishing of the flange radius and weld area. The spider connecting handle, where the outer retaining ring is to be cut, is similarly positioned using the outer retaining ring's second locating pin hole 31, the main plate's first locating pin hole 42, and the pin 7. The outer retaining ring is then secured using two pressure blocks 52. The support assembly 6 is mounted to the bottom of the main plate 4 using two screws, with the support block 63 mating with the bottom of the center tube 1.

[0057] like Figure 9As shown, during the outer retainer ring cutting step, the outer retainer ring is cut at the outer end of each of the 24 wing panels. The support arm 62 passes between two adjacent wing panels 21, and the cutting path is designed so that the support assembly 6 is not cut. The support assembly 6 can stably support the entire spider connecting handle during the outer retainer ring cutting process.

[0058] By adopting the above novel processing method, the deformation of the finished star frame connecting handle after cutting can be reduced and the manufacturing accuracy of the product can be improved.

[0059] In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0060] 1. The fixture of the present application can realize the upward installation of the center tube of the star-shaped frame connecting handle to be processed by setting a main board, a clamping assembly and a flexibly installed support assembly, and meet the cutting requirements of the wing plate and the outer fixing ring, which greatly simplifies the structure of the fixture and makes the installation steps simpler.

[0061] 2. The fixture of the present application is designed with a specific structure of the support assembly and a matching structure with the bottom of the center tube, so that the support assembly will not be cut during the cutting process of the outer fixing ring, and the entire star frame connecting handle can be stably supported after the outer fixing ring is cut.

[0062] 3. The clamp of the present application is designed with a structure of a clamping assembly, so that the clamp can fix the star-shaped frame connecting handle to be processed very simply and firmly, and will not cause any influence during the entire wire cutting process.

[0063] 4. The fixture of this application is designed with positioning pin holes and pins so that the repeated positioning error of the product after clamping does not exceed 0.03mm. Combined with the new processing method, it can reduce the deformation of the product after cutting and improve the product manufacturing accuracy.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fixture for machining a connecting handle, used for clamping an integrated star-shaped connecting handle to be machined, characterized in that: The star frame connecting handle to be processed comprises a central tube (1), a wing plate portion (2) and an outer fixing ring (3), and the fixture comprises: A main board (4), wherein the main board (4) has a processing hole (41), and the outer diameter of the processing hole (41) is smaller than the outer diameter of the outer fixing ring (3) and not smaller than the inner diameter of the outer fixing ring (3); A pressing assembly (5), the pressing assembly (5) being arranged on the main board (4), and the pressing assembly (5) being capable of cooperating with the outer fixing ring (3) to press the star frame connecting handle to be processed onto the main board (4); A support assembly (6) is detachably connected to the main board (4), and the support assembly (6) can support the bottom of the star frame connecting handle from below the processing hole (41).

2. The clamp according to claim 1, characterized in that: The support assembly (6) includes a support arm (62) and a connecting block (61) and a supporting block (63) respectively located at both ends of the support arm (62), wherein the connecting block (61) is connected to the bottom surface of the main board (4), and the supporting block (63) is located on the axis of the processing hole (41) and cooperates with the bottom of the central tube (1).

3. The clamp according to claim 2, characterized in that: The processed wing plate portion (2) comprises a plurality of wing plates (21) located in the circumferential direction of the central tube (1), and the support arm (62) passes through the position between two adjacent wing plates (21).

4. The clamp according to claim 2, characterized in that: The support block (63) comprises a first columnar portion (64) and a second columnar portion (65), wherein the first columnar portion (64) is located above the second columnar portion (65) and is coaxially arranged, and the diameter of the first columnar portion (64) is smaller than that of the second columnar portion (65).

5. The clamp according to claim 1, characterized in that: The clamping assembly (5) includes a pad (51) and a pressure block (52), wherein two or more pads (51) are respectively connected to the main board (4), and the pressure block (52) is detachably connected to the pad (51), and at least a portion of the bottom of the pressure block (52) is tightly fitted with the upper surface of the outer fixing ring (3).

6. The clamp according to claim 5, characterized in that: Three fastener holes (53) are arranged on the backing plate (51) along the length direction. The fastener holes (53) located on both sides are connected to the main board (4) through fasteners. The length direction of the pressing block (52) is perpendicular to the backing plate (51). The pressing block (52) is connected to the fastener hole (53) at the middle position through fasteners.

7. The clamp according to claim 1, characterized in that: The main board (4) is provided with more than two first positioning pin holes (42), and the outer fixing ring (3) is correspondingly provided with more than two second positioning pin holes (31), and the first positioning pin holes (42) and the second positioning pin holes (31) are both matched with the pins (7).

8. The clamp according to claim 7, characterized in that: The pin (7) is a cylindrical stepped pin, and the outer diameter of the processed hole (41) is the same as the inner diameter of the outer fixing ring (3).

9. The clamp according to claim 1, characterized in that: A fixture reference hole (43) is provided on the main board (4), and the fixture reference hole (43) is located outside the outer fixing ring (3) in the radial direction.

10. The clamp according to claim 1, wherein: The main board (4) is provided with a plurality of fixing holes (44), and the main board (4) is fixed to the machining equipment through the fixing holes (44).

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