Clamping device and processing method for control rod drive mechanism seal tube

Abstract

The application discloses a clamping device for a control rod drive mechanism sealing cylinder and a processing method. The clamping device comprises a first flange and a second flange, the first flange is provided with a first assembly hole, the second flange is provided with a second assembly hole, the first flange is in butt joint with the second flange, one end of the first flange towards the second flange is provided with a groove, the groove is arranged around the first assembly hole, one end of the second flange towards the first flange is provided with a protrusion, the protrusion is arranged around the second assembly hole, and the protrusion extends into the groove; and a buffer is arranged between the groove and the protrusion. The processing method for the cylinder of the control rod drive mechanism sealing assembly by using the clamping device overcomes the problem of deformation affecting the precision of the part in the processing of the thin-wall cylinder, improves the qualified rate, solves the problem of repairing the deformed part, and realizes the remanufacturing of the part.

Description

Technical Field

[0001] This invention relates to the field of nuclear power equipment sealing shell manufacturing technology, and in particular to a clamping device and processing method for a control rod drive mechanism sealing cylinder. Background Technology

[0002] The sealing shell is a component of the control rod drive mechanism and forms part of the pressure-bearing boundary of the reactor coolant system; it is a Class I nuclear safety component. The sealing shell is a slender cylindrical shape, formed by welding a transition layer onto the outer circumference of the main material using a welding process, followed by thermal spraying at one end of the outer circumference where it is assembled and positioned. The manufacturing process of the sealing shell involves complex conditions including welding, thermal spraying, electroplating, and machining. It is susceptible to deformation due to the high temperatures of welding and thermal spraying, cutting heat, and residual stress from machining, making dimensional accuracy and surface quality control difficult. Deformed parts, in particular, present repair challenges, making remanufacturing difficult. Summary of the Invention

[0003] The purpose of this invention is to provide a clamping device and processing method for a sealing cylinder of a control rod drive mechanism, in order to solve the problem that the sealing shell workpiece is prone to deformation during processing under complex manufacturing conditions, making it difficult to guarantee dimensional accuracy and surface quality control.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] This invention provides a clamping device for a sealing cylinder of a control rod drive mechanism, comprising: a first flange and a second flange, the first flange having a first mounting hole and the second flange having a second mounting hole, the first flange and the second flange being mated together, the first flange having a groove at one end facing the second flange, the groove surrounding the first mounting hole, the second flange having a protrusion at one end facing the first flange, the protrusion surrounding the second mounting hole and extending into the groove; and a buffer member disposed between the groove and the protrusion.

[0006] In some embodiments, screws are also included, by which the first flange and the second flange are connected.

[0007] In some embodiments, the buffer has a third mounting hole, and the first mounting hole, the second mounting hole and the third mounting hole are sequentially connected along the axial direction.

[0008] In some embodiments, the cylinder has an outer wall extending along the axial direction, and the third mounting hole is used to contact the outer wall.

[0009] In some embodiments, the third assembly hole has a first inner diameter G1 in the radial direction, the first assembly hole and the second assembly hole have a second inner diameter G2, the outer wall has a first outer diameter D, the buffer has a first width h1 in the axial direction, and G1 < D < G2 is satisfied.

[0010] In some embodiments, the recess has a third inner diameter G3 in the radial direction, and the buffer has a second outer diameter G4 in the radial direction, and G3 ≤ G4 is satisfied.

[0011] In some embodiments, when the buffer is pressed against the outer wall, the buffer has a fourth inner diameter G5 in the radial direction, and the buffer has a second width h2 in the axial direction, and G5 < D and h2 < h1 are satisfied.

[0012] The application also provides a machining method for a barrel of a control rod drive mechanism sealing assembly using the clamping device described above, the machining method comprising:

[0013] forming the barrel by multiple cutting processes on a first deep hole of a pipe;

[0014] installing the clamping device on the outer wall of the barrel, and reciprocating the clamping device along the length direction of the barrel on the outer wall, wherein the clamping device comprises a first flange, a second flange, a buffer, and a screw, and the degree of close fit between the buffer and the outer wall is adjusted by the screw to reshape the outer wall.

[0015] In some embodiments, the barrel has a second deep hole, the first deep hole has a first diameter d1 in the radial direction, the second deep hole has a second diameter d2, the barrel has a second wall thickness t2, and the single-side cutting amount of the first deep hole in forming the second deep hole is t1, and t1 = d2 - d1 is satisfied.

[0016] In some embodiments, the step of forming the second deep hole from the first deep hole further comprises:

[0017] assuming that the required size of the deep hole after each cutting process is d2n, the inner hole size before each deep hole process is d1n, the cutting amount T3n of each cutting process, and the number of cutting processes n are calculated in the following manner:

[0018] T3n = (d2n - d1n) / 2 ≤ (Dn - d2n) / 2;

[0019] d1 = d2 + 2 * ∑T3n; n is a positive integer greater than or equal to 1.

[0020] In some embodiments, the pipe has a wall thickness in the radial direction, and the wall thickness is less than 2.5 mm.

[0021] The clamping device of the application has the advantages that the clamping device comprises a first flange and a second flange, the first flange is provided with a first assembly hole, the second flange is provided with a second assembly hole, the first flange is in abutment with the second flange, the first flange is provided with a groove at one end facing the second flange, the groove is arranged around the first assembly hole, the second flange is provided with a protrusion at one end facing the first flange, the protrusion is arranged around the second assembly hole, and the protrusion extends into the groove; and a buffer is arranged between the groove and the protrusion. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the body before and after cutting processing of the application;

[0023] Figure 2 is a schematic diagram of the body after multiple cutting of the application;

[0024] Figure 3 is a structural schematic diagram of the clamping device;

[0025] Figure 4 is a structural schematic diagram of the buffer of the clamping device;

[0026] Figure 5 is a structural schematic diagram of the first flange of the clamping device;

[0027] Figure 6 is an assembly schematic diagram of the clamping device to the outer diameter of the body;

[0028] The reference numerals in the drawings are as follows: 1-pipe, 101-first deep hole, 10-cylinder, 102-second deep hole, 103-outer wall, 100-first flange, 110-first body, 120-first assembly hole, 130-groove, 140-mounting hole, 200-second flange, 210-second body, 220-second assembly hole, 230-protrusion, 300-buffer, 310-third assembly hole, 400-screw. DETAILED DESCRIPTION

[0029] The following gives a specific embodiment of the clamping device and processing method of the control rod drive mechanism sealing cylinder of the application in combination with the drawings, but it should be noted that the implementation of the application is not limited to the following embodiment.

[0030] Reference is made to Figure 3 and Figure 4This application also discloses a clamping device for a sealing cylinder of a control rod drive mechanism. The sealing cylinder of the control rod drive mechanism includes a cylinder body 10, and the clamping device is used to clamp the cylinder body 10. The inner circumference of the clamping device cooperates with the outer circumference of the cylinder body 10. The clamping device includes a first flange 100, a second flange 200, and a buffer member 300.

[0031] like Figure 3 As shown, the first flange 100 includes a first body 110 with a first mounting hole 120. The second flange 200 includes a second body 210 with a second mounting hole 220. The first body 110 and the second body 210 are connected along the axial direction X. The first mounting hole 120 and the second mounting hole 220 communicate along the axial direction X. A groove 130 is provided at one end of the first body 110 facing the second body 210. The groove 130 is arranged radially Y around the first mounting hole 120. A protrusion 230 is provided at one end of the second body 210 facing the first body 110. The protrusion 230 contacts the groove 130 radially Y and extends axially X into the groove 130. A buffer member 300 is provided between the protrusion 230 and the groove 130. The buffer member 300 has a third mounting hole 320 along the axial direction X, and its outer peripheral surface contacts the groove 130 around the axial direction X. The buffer member 300 is a rubber ring.

[0032] In this embodiment, the clamping device further includes screws 400, which are installed between the first body 110 and the second body 210. Multiple screws 400 are arranged circumferentially around the axial direction X, and are used to fix the first flange 100 and the second flange 200. Figure 5 As shown, the first body 110 has a mounting hole 140, and the screw 400 passes through the second body 210 and is assembled with the mounting hole 140 to connect the first body 110 and the second body 210.

[0033] In the embodiment of the present application, the third assembly hole 320 has a first inner diameter G1, the first assembly hole 120 and the second assembly hole 220 have equal inner diameters, the first assembly hole 120 and the second assembly hole 220 have a second inner diameter G2, the barrel 10 has a first outer diameter D along the radial direction Y, the groove 130 has a third inner diameter G3 along the radial direction X due to the contact between the outer peripheral surface of the buffer 300 around the axial direction X and the groove 130, the buffer 300 has a second outer diameter G4 along the radial direction Y, and the buffer 300 has a first width h1 along the axial direction X; wherein the second inner diameter G2 of the first assembly hole 120 and the second assembly hole 220 is greater than the first outer diameter D of the barrel 10, the first inner diameter G1 of the third assembly hole 320 is less than the first outer diameter D of the barrel 10, and the second outer diameter G4 of the buffer 300 is equal to or slightly greater than the third inner diameter G3 of the groove 130. When the buffer 300 is installed between the first flange 100 and the second flange 200, the screw 400 is tightened to compress the buffer 300 through the protrusion 230 of the second flange 200. The buffer 300 in the compressed state has a second width h2 along the axial direction X, and the buffer 300 in the compressed state has a fourth inner diameter G5 along the axial direction X, wherein the second width h2 is less than the first width h1, and the fourth inner diameter G5 of the buffer 300 is less than the first outer diameter D of the barrel 10. The compression degree of the buffer 300 is adjusted by the screw 400.

[0034] The third assembly hole 310 of the buffer 300 has an inner wall distributed around the axial direction X. The barrel 10 of the control rod drive mechanism sealing cylinder is reshaped and remanufactured by using a clamping device. The reshaping process enables the inner wall of the buffer 300 to tightly press the outer peripheral surface of the barrel 10. The clamping device moves along the axial direction X on the outer peripheral surface of the barrel 10, moves back and forth on the entire length by multiple clamping, and adjusts the tightness of the buffer 300, so that the fourth inner diameter G5 of the buffer 300 and the first outer diameter D of the barrel 10 are tightly matched, and the first outer diameter D of the barrel 10 is compressed, thereby generating extrusion on the first outer diameter D of the barrel 10, achieving the effect of reshaping the outer peripheral surface of the barrel 10, and the compression degree is adjusted by the screw 400, that is, the tightness of the inner diameter of the buffer 300 and the first outer diameter D of the barrel 10 is adjusted.

[0035] Referring to Figure 1 , Figure 2 and Figure 6 , the present application discloses a control rod drive mechanism sealing cylinder manufacturing method for machining a pipe 1, the pipe 1 being an elongated rod thin-walled barrel structure, the pipe 1 having a first deep hole 101, the control rod drive mechanism sealing cylinder manufacturing method comprising:

[0036] The first deep hole 101 of the pipe 1 is processed multiple times to form the barrel 10, the barrel 10 has a second deep hole 102, the first deep hole 101 has a first diameter d1, the second deep hole 102 has a second diameter d2, the barrel 10 has a second wall thickness t2, and the single cutting amount of the first deep hole 101 for processing the second deep hole 102 is:

[0037] t1=d2-d1 (Formula 1);

[0038] In this step, the pipe 1 has a wall thickness in the radial direction Y, which is less than 2.5mm.

[0039] In the step of processing the second deep hole 102 from the first deep hole 101, it also includes:

[0040] Suppose the number of times of cutting the deep hole for processing the second deep hole 102 from the first deep hole 101 is n, the inner diameter of the first deep hole 101 before processing is d1, the outer diameter of the pipe 1 before each cutting is Dn, the required size of the deep hole after each cutting is d2n, the inner hole size before each deep hole processing is d1n, and the final size of the second deep hole 102 is d2, the cutting amount T3n of each cutting and the number of times of cutting n are calculated as follows:

[0041] T3n=(d2n-d1n) / 2≤(Dn-d2n) / 2, (Formula 2);

[0042] d1=d2+2*∑T3n; n=1, 2, …, (Formula 3);

[0043] According to Formula 2, the cutting amount T3n of each cutting and the number of times of cutting the deep hole for processing the second deep hole 102 from the first deep hole 101 can be determined to verify whether the selected cutting amount and cutting times of each cutting are correct.

[0044] Through the above formula, it can be verified whether the number of times of processing the deep hole and the cutting amount of each cutting in the process design are correct, so as to ensure that the change amount of the part after deep hole processing is within the tolerance range.

[0045] The control rod drive mechanism sealing barrel manufacturing method further includes:

[0046] The clamping device is installed on the outer wall 103 of the barrel 10, and the clamping device is moved back and forth on the outer wall 103 in the length direction of the barrel 10, wherein the clamping device includes a first flange 100, a second flange 200 and a buffer 300, and the tightness of the buffer 300 and the outer wall 103 is adjusted to reshape the outer wall 103 of the barrel 10.

[0047] In this step, it needs to be explained that the third assembly hole 320 of the buffer 300 has a first inner diameter G1, the first assembly hole 120 of the first flange 100 and the second assembly hole 220 of the second flange 200 have a second inner diameter G2, the outer wall 103 of the cylinder body 10 has a first outer diameter D along the radial direction Y, since the outer peripheral surface of the buffer 300 around the axial direction X is in contact with the groove 130 of the first flange 100, the groove 130 has a third inner diameter G3 along the radial direction X, the buffer 300 has a second outer diameter G4 along the radial direction Y, and the buffer 300 has a first width h1 along the axial direction X; wherein the second inner diameter G2 is greater than the first outer diameter D, the first inner diameter G1 is less than the first outer diameter D, and the second outer diameter G4 is equal to or slightly greater than the third inner diameter G3.

[0048] In this step, it also needs to be explained that by tightening the screw 400, the buffer 300 is pressed against the outer wall 103 of the cylinder body 10, and the buffer 300 has a second width h2 and a fourth inner diameter G5 along the axial direction X when being pressed, wherein the second width h2 is less than the first width h1, the fourth inner diameter G5 of the buffer 300 is less than the first outer diameter D of the cylinder body 10, and the pressing degree of the buffer 300 is adjusted by the screw 400. For the method of remanufacturing the control rod drive mechanism sealing cylinder, no additional cutting processing and surface treatment are performed, but the clamping device is used to repair the outer diameter size of the cylinder body 10 of the control rod drive mechanism sealing cylinder to meet the size requirements, and the clamping device is used to ensure that the electroplating, nitriding, carburizing and other chemical treatment surfaces of the outer peripheral surface of the workpiece, i.e. the cylinder body 10, are not damaged during the repair of the outer diameter of the cylinder body 10.

[0049] The clamping device for the control rod drive mechanism sealing cylinder and the processing method provided by the present application comprise: a first flange 100 and a second flange 200, the first flange 100 is provided with a first assembly hole 120, the second flange 200 is provided with a second assembly hole 220, the first flange 100 is in abutment with the second flange 200, one end of the first flange 100 facing the second flange 200 is provided with a groove 130, the groove 130 is arranged around the first assembly hole 120, one end of the second flange 200 facing the first flange 100 is provided with a protrusion 230, the protrusion 230 is arranged around the second assembly hole 220, and the protrusion 230 extends into the groove 130; a buffer 300 is arranged between the groove 130 and the protrusion 230. The processing method for the cylinder body 10 of the control rod drive mechanism sealing assembly by using the above clamping device overcomes the problem of deformation affecting the accuracy of the part in the processing of the thin-walled cylinder body, improves the qualified rate, solves the problem of repairing the deformed part in the reshaping mode of the thin-walled shell part, realizes the remanufacturing of the part, and saves the cost.

[0050] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A clamping device for clamping a barrel (10) of a control rod drive mechanism seal can, characterized by The application relates to a processing method and a processing device for a pipe fitting (1). The pipe fitting (1) comprises a first flange (100) and a second flange (200), the first flange (100) is provided with a first assembly hole (120), the second flange (200) is provided with a second assembly hole (220), the first flange (100) is connected with the second flange (200), one end of the first flange (100) towards the second flange (200) is provided with a groove (130), the groove (130) is arranged around the first assembly hole (120), one end of the second flange (200) towards the first flange (100) is provided with a protrusion (230), the protrusion (230) is arranged around the second assembly hole (220), and the protrusion (230) extends into the groove (130); a buffer (300) is arranged between the groove (130) and the protrusion (230), the buffer (300) is provided with a third assembly hole (310), the first assembly hole (120), the second assembly hole (220) and the third assembly hole (310) are sequentially communicated along an axial direction (X), the third assembly hole (310) has a hole diameter smaller than that of the first assembly hole (120) and the second assembly hole (220); the cylinder body (10) has an outer wall (103) extending along the axial direction (X), the third assembly hole (310) is used for being in contact with the outer wall (103), the clamping device can move back and forth along the axial direction (X) on the outer circumferential surface of the cylinder body (10), and the third assembly hole (310) is tightly pressed against the outer wall (103) to reshape the outer wall (103); a screw (400) is arranged, and the first flange (100) and the second flange (200) are connected through the screw (400).

2. The clamping device of claim 1, wherein In a radial direction (Y), the third assembly hole (310) has a first inner diameter G1, the first assembly hole (120) and the second assembly hole (220) have a second inner diameter G2, the outer wall (103) has a first outer diameter D along the radial direction (Y), and the buffer (300) has a first width h1 along the axial direction (X), and the following conditions are met: G1 3. The clamping device of claim 2, wherein In the radial direction (Y), the groove (130) has a third inner diameter G3, and the buffer (300) has a second outer diameter G4, and the following condition is met: G3 4. The clamping device of claim 2, wherein When the buffer (300) is tightly pressed against the outer wall (103), the buffer (300) has a fourth inner diameter G5 along the radial direction (Y), and the buffer (300) has a second width h2 along the axial direction (X), and the following conditions are met: G5 5. A method of machining a barrel (10) of a control rod drive mechanism seal tube using the clamping device according to any one of claims 1 to 4, characterized by The processing method comprises the following steps: the first deep hole (101) of the pipe fitting (1) is processed by multiple cutting to form the cylinder body (10). The clamping device is installed on the outer wall (103) of the barrel (10), and the clamping device moves back and forth on the outer wall (103) along the length direction of the barrel (10), wherein the clamping device comprises a first flange (100), a second flange (200), a buffer (300) and a screw (400), and the screw (400) is used to adjust the close fit degree of the buffer (300) and the outer wall (103) to reshape the outer wall (103).

6. The method of claim 5, wherein, The barrel (10) has a second deep hole (102), the first deep hole (101) has a first diameter d1 in the radial direction (Y), the second deep hole (102) has a second diameter d2, the barrel (10) has a second wall thickness t2, and the single-side cutting amount of the first deep hole (101) for machining the second deep hole (102) is t1, and the following formula is satisfied: t1=d2-d1.

7. The method of claim 6, wherein, The step of machining the second deep hole (102) from the first deep hole (101) further comprises: Suppose that the outer diameter of the pipe fitting (1) along the radial direction (Y) before each cutting process is Dn, the required size of the deep hole after each cutting process is d2n, the inner hole size before each deep hole machining is d1n, the cutting amount T3n and the cutting times n of each cutting process are calculated by the following method: T3n=(d2n-d1n) / 2≤(Dn-d2n) / 2, d1=d2+2*∑T3n, n is a positive integer greater than or equal to 1.

8. The method of claim 5, wherein, The pipe fitting (1) has a wall thickness along the radial direction (Y), and the wall thickness is less than 2.5 mm.

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