Nuclear reactor stretcher hole site repairing tool and repairing method thereof

Abstract

The invention belongs to the technical field of stretching machine hole site repairing, and particularly relates to a nuclear reactor stretching machine hole site repairing tool and a repairing method thereof.The tool comprises a bearing seat A, four fixing tool plates, two screw rods and a lower adjusting assembly, and the two fixing tool plates are arranged at the corresponding positions of the upper end and the lower end of a hole site respectively; the fixing tool plates corresponding to the upper ends and the lower ends of the hole sites are connected through screws. The two fixing tool plates at the upper end of the hole site are connected with the bearing seat A, the bearing seat A is used for loading a boring rod of the boring machine, the bearing seat A is used for fine adjustment of the boring rod, and the fixing tool plates are used for rough adjustment of the boring rod; the lower adjusting assembly is arranged at the lower section position of the boring rod and used for fixing and adjusting the boring rod. The tool comprises two assembling modes, the through hole can be machined through the two end face installing and fixing tool bodies, the machining method for installing and fixing the tool bodies in the hole and the upper end face is suitable for machining of the lower portion of the hole site, and the machining precision of hole site repairing is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of repair of the hole positions of a stretching machine, and particularly relates to a repair tooling for hole positions of a nuclear reactor stretching machine and a repair method thereof. Background Art

[0002] In a VVER-1000 nuclear power unit, 54 main bolts are used for sealing the main sealing surface of a reactor pressure vessel. During the overhaul of the nuclear power unit, a main bolt stretching machine (hereinafter referred to as the stretching machine) is required to be used for sealing and unsealing the main joint surface of the reactor pressure vessel, and the stretching machine can stretch 54 main bolts synchronously and evenly.

[0003] In a nuclear power unit, the inner diameters of two-stage stepped holes of the stretching machine from the lower end face upwards at the normal hole positions are 245 mm and 242 mm respectively, but the inner diameters of two stages of four hole positions are both 240 mm. Therefore, when the stretching machine is used for opening and closing the cover of the pressure vessel during the overhaul of the nuclear power unit, it is difficult for the stretching machine to be centered and difficult to fall into place, and the hole positions of the supporting ring of the stretching machine need to be repaired. At present, the following problems exist in the repair of the hole positions of the supporting ring of the stretching machine:

[0004] 1. The stretching machine is assembled by two half rings, and the four hole positions with an inner diameter of 240 mm are all at the edges of the half rings. Since the working pressure of the supporting ring is relatively large, in order to avoid insufficient strength of the processed supporting ring, the machining allowance is limited, and relatively high precision machining is required.

[0005] 2. Since the height of the lower end face of the supporting ring from the ground is limited and the four machining hole positions are all at the edges, when repairing the hole positions, the two half rings need to be assembled together, and the width dimension of the supporting ring of the stretching machine is limited, so the working position is restricted and it is not easy to machine. Summary of the Invention

[0006] Aiming at the problems of high precision requirements for hole position repair and limited machining positions of a nuclear reactor stretching machine in the prior art, the invention provides a repair tooling for hole positions of a nuclear reactor stretching machine and a repair method thereof.

[0007] The technical solution of the invention is as follows:

[0008] The invention provides a repair tooling for hole positions of a nuclear reactor stretching machine. The tooling includes a bearing seat A, 4 fixed tooling plates, 2 screw rods and a lower adjusting component. At the corresponding positions at the upper end and the lower end of the hole position, 2 fixed tooling plates are respectively arranged, and the fixed tooling plates at the upper end and the lower end of the hole position are connected by screw rods; the 2 fixed tooling plates at the upper end of the hole position are respectively connected with the bearing seat A. The bearing seat A is used for loading the boring bar of a boring machine, and the bearing seat A is used for fine adjustment of the boring bar, and the fixed tooling plates are used for rough adjustment of the boring bar; the lower adjusting component is arranged at the lower section position of the boring bar, and the lower adjusting component is used for fixing and adjusting the boring bar.

[0009] In some embodiments, the bearing housing A is connected to the fixed tooling plate through a bearing housing fixing plate.

[0010] In some embodiments, the lower adjustment assembly includes a bearing housing fixing plate and a bearing housing C. The bearing housing C is respectively connected to two fixed tooling plates provided at the lower end of the hole position through the bearing housing fixing plate. The bearing housing C is used for loading the boring bar.

[0011] In some embodiments, the lower adjustment assembly includes a bearing housing B. The bearing housing B is provided inside the hole position. Both ends of the bearing housing B abut against the inner wall of the hole position. The bearing housing B is used for loading the boring bar.

[0012] In some embodiments, one dial indicator is provided on the inner side of each of the fixed tooling plates at the upper end and the lower end of the hole position. The dial indicator is used to determine whether the boring bar is at the center of the machining hole.

[0013] In some embodiments, the screw rod passes through adjacent holes on both sides of the hole to be machined and is fixed on the upper and lower fixed tooling plates of the hole to be machined through nuts.

[0014] The present invention proposes a repair method for a hole position repair tooling of a nuclear reactor stretching machine. The method includes:

[0015] Step 1: Install the tooling according to the hole position to be measured on the stretching machine;

[0016] Step 2: Install the dial indicator and adjust the concentricity of the boring bar through the dial indicator;

[0017] Step 2.1: Install a dial indicator on the inner side of each of the upper and lower fixed tooling plates of the hole to be measured;

[0018] Step 2.2: Rotate the boring bar at a low speed, select 4 points on the inner circle of the hole to be machined, read the readings of the dial indicator at these 4 positions, and determine whether the boring bar is at the center of the machining hole;

[0019] Step 2.3: According to the measurement results of the dial indicator, roughly adjust the concentricity of the boring bar by adjusting the fixed tooling plate;

[0020] Step 2.4: Fine-tune the concentricity of the boring bar by adjusting the bearing housing A and the bearing housing of the lower adjustment assembly;

[0021] Step 3: Use a boring machine to repair the hole position to be measured;

[0022] Step 3.1: Install the spindle box and feed box of the boring machine at the hole to be machined, and check the idling condition of the equipment after power-on inspection;

[0023] Step 3.2: Coat the inner surface of the hole to be machined with an oil-based pen, align the tip of the boring tool at the position where the coating is applied, and use the data measured by the dial indicator as a reference for the first cutting depth for machining with a slight scratch on the coating as the benchmark.

[0024] Step 3.3: After the first machining, use an internal diameter micrometer to measure the internal diameter of the hole to be machined, and perform machining according to the measured data until the hole to be machined meets the standard dimensions of the drawing.

[0025] In some embodiments, the specific steps of installing the tooling according to the hole positions of the stretching machine in Step 1 include:

[0026] Step 1.1: Weld the bearing housing A to the fixed tooling plate through the bearing housing fixing plate.

[0027] Step 1.2: Pass a screw through the adjacent holes on both sides of the hole to be machined and the fixed tooling plate, and lock the screw with a nut.

[0028] Step 1.3: Install the boring bar of the boring machine at the hole to be machined. According to the position of the hole to be machined, install a suitable lower adjusting component at the lower section of the boring bar, and roughly adjust the concentricity of the boring bar by adjusting the fixed tooling plate.

[0029] In some embodiments, in Step 2.4, the concentricity of the boring bar is finely adjusted by adjusting the bearing housing A and the bearing housing of the lower adjusting component to ensure that the maximum deviation of the measurement results at both ends within one rotation of the dial indicator is within 0.1 mm.

[0030] In some embodiments, the specific installation of a suitable lower adjusting component in Step 1.3 is as follows: For the through holes with repair tooling installed on both sides, the lower adjusting component includes a bearing housing fixing plate and a bearing housing C. The bearing housing C is respectively connected to the 2 fixed tooling plates provided at the lower end of the hole position through the bearing housing fixing plate, and the bearing housing C is used to load the boring bar; For the hole to be machined with repair tooling installed at one end and inside the hole, the lower adjusting component includes a bearing housing B. The bearing housing B is provided inside the hole position, and both ends of the bearing housing B abut against the inner wall of the hole position. The bearing housing B is used to load the boring bar.

[0031] Implementing the present invention has the following beneficial effects:

[0032] The present invention provides a repair tooling for the hole positions of a nuclear reactor stretching machine and a repair method thereof. Implementing the present invention has the following beneficial effects:

[0033] 1. This tooling is used in conjunction with a boring machine, which can machine various types of holes and end faces, and this tooling can be used for machining in any direction, greatly improving the applicability and operability of machining.

[0034] 2. Both this tooling and the boring machine adopt a modular design, are light in weight, are convenient for on-site assembly and disassembly, this tooling occupies less space, can meet the on-site working environment, and does not affect the reinstallation of other components such as the stretching cylinders at other hole positions.

[0035] 3. This tooling uses the method of rough adjustment with a fixed tooling plate and fine adjustment of the bearing seat, and measures with a dial indicator. The highest roundness machining accuracy of this tooling is 0.05 mm, and the surface roughness is Ra1.6 - 3.2. Moreover, this tooling includes two assembly methods. Installing the fixed tooling on both end faces can machine the through hole, and the machining method of installing the fixed tooling inside the hole and on the upper end face is applicable to the machining of the lower part of the hole position, and the machining accuracy can be further improved. Description of the Drawings

[0036] Figure 1 Schematic diagram of the installation of the fixed tooling on both end faces of a hole position repair tooling for a nuclear reactor stretching machine proposed in an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the installation of the fixed tooling inside the hole and on the upper end face of a hole position repair tooling for a nuclear reactor stretching machine proposed in an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of a boring machine of a hole position repair tooling for a nuclear reactor stretching machine proposed in an embodiment of the present invention;

[0039] Description of the Drawings: 1. Screw; 2. Bearing seat A; 3. Boring bar; 4. Tool rest; 5. Dial indicator; 6. Bearing seat fixing plate; 7. Fixed tooling plate; 8. Bearing seat B; 9. Bearing seat C; 10. Boring machine. Detailed Embodiments

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the drawings and specific embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment 1: A fixed tooling symmetrically installed on both end faces

[0042] As Figure 1As shown in the figure, the tooling includes a bearing block A2, 4 fixed tooling plates 7, 2 screw rods 1 and a lower adjusting component. At the upper and lower corresponding positions of the hole to be machined, 2 fixed tooling plates 7 are provided respectively. The fixed tooling plates 7 corresponding to the upper and lower ends of the hole are connected by screw rods 1. The screw rods 1 pass through the adjacent holes on both sides of the hole to be machined and are fixed on the upper and lower fixed tooling plates 7 of the hole to be machined by nuts. On the inner sides of the fixed tooling plates 7 at the upper and lower ends of the hole to be machined, 1 dial indicator 5 is provided respectively. The dial indicator 5 is used to judge whether the boring bar 3 is at the center of the machining hole. When using the dial indicator, the base of the dial indicator is sucked on the boring bar, and the pointer is perpendicular to the wall of the hole to be machined. Generally, when the boring bar drives the dial indicators at the upper and lower positions to rotate one week, if the deviation of the dial indicator data does not exceed 0.1 mm, the coaxiality of the boring bar and the hole to be machined can be ensured. If not satisfied, the boring bar needs to be adjusted.

[0043] The 2 fixed tooling plates 7 at the upper end of the hole are respectively connected to the bearing block A2 through the bearing block fixing plate 6. The bearing block A2 is used to load the boring bar 3 of the boring machine 10. The bearing block A2 is used for fine adjustment of the boring bar 3. The fixed tooling plate 7 is used for rough adjustment of the boring bar 3. A tool rest 4 is provided on the boring bar 3, and a boring tool is installed on the tool rest. The boring tool and the tool rest 4 can be adjusted on the boring bar 3.

[0044] The lower adjusting component is arranged at the lower section position of the boring bar 3. The lower adjusting component is used to fix and adjust the boring bar 3. The lower adjusting component includes a bearing block fixing plate 6 and a bearing block C9. The bearing block C9 is respectively connected to the 2 fixed tooling plates 7 arranged at the lower end of the hole through the bearing block fixing plate 6. The bearing block C9 is used to load the boring bar 3.

[0045] This processing method of symmetrically installing and fixing the tooling at both ends is applicable to through-hole machining. The concentricity of the boring bar 3 can be roughly adjusted by the fixed tooling plates 7 at both ends, and the concentricity of the boring bar 3 can be finely adjusted by the bearing blocks A2 and C9 at both ends, ensuring the perpendicularity and accuracy of the machining hole position.

[0046] Embodiment 2: A fixing tooling for installation inside the hole and on the upper end face

[0047] As Figure 2As shown in the figure, the tooling includes a bearing block A2, 4 fixed tooling plates 7, 2 screw rods 1, and a lower adjustment assembly. At the upper and lower corresponding positions of the hole to be machined, 2 fixed tooling plates 7 are provided respectively. The fixed tooling plates 7 corresponding to the upper and lower ends of the hole are connected by screw rods 1. The screw rods 1 penetrate through the adjacent holes on both sides of the hole to be machined and are fixed on the upper and lower fixed tooling plates 7 of the hole to be machined by nuts. On the inner sides of the fixed tooling plates 7 at the upper and lower ends of the hole to be machined, 1 dial indicator 5 is provided respectively. The dial indicator 5 is used to judge whether the boring bar 3 is at the center of the machining hole. The 2 fixed tooling plates 7 at the upper end of the hole are respectively connected to the bearing block A2 through bearing block fixing plates 6. The bearing block A2 is used to load the boring bar 3 of the boring machine 10, and the bearing block A2 is used for fine adjustment of the boring bar 3. The fixed tooling plate 7 is used for rough adjustment of the boring bar 3.

[0048] The lower adjustment assembly is arranged at the lower section position of the boring bar 3. The lower adjustment assembly is used to fix and adjust the boring bar 3. The lower adjustment assembly includes a bearing block B8. The bearing block B8 is arranged inside the hole. The two ends of the bearing block B8 abut against the inner walls of the hole. The bearing block B8 is used to load the boring bar 3 and adjust the concentricity of the boring bar 3.

[0049] The processing method for installing and fixing the tooling in the hole and on the upper end face is applicable to the situation where the fixed tooling cannot be installed at one end of the hole position. The concentricity of the boring bar 3 can be roughly adjusted by the fixed tooling plate 7 on the upper end face of the hole position, and the concentricity of the boring bar 3 can be finely adjusted by the bearing block A2 on the upper end face and the bearing block B8 in the middle of the hole position to ensure the perpendicularity and accuracy of the machining hole position.

[0050] The present invention proposes a repair method for a hole position repair tooling of a nuclear reactor stretching machine. The method includes:

[0051] Step 1: Arrange the working site and install the tooling according to the hole position to be measured of the stretching machine;

[0052] Step 1.1: Weld the bearing block A2 to the fixed tooling plate 7 through the bearing block fixing plate 6;

[0053] Step 1.2: On the upper and lower end faces of the support ring, use the adjacent holes on both sides of the hole to be machined as the installation holes for the fixed tooling plate 7. Pass the screw rod 1 through the fixed tooling plate 7 and then lock it with a nut;

[0054] Step 1.3: With the inner hole of the hole to be machined as the reference, install the boring bar 3 of the boring machine 10 at the hole to be machined. According to the position of the hole to be machined, install a suitable lower adjustment component at the lower section of the boring bar 3, and adjust and fix the tooling plate 7 to roughly adjust the concentricity of the boring bar 3. Specifically, for the through holes with repair tooling installed on both sides, the lower adjustment component includes a bearing seat fixing plate 6 and a bearing seat C9. The bearing seat C9 is respectively connected to the 2 tooling plates 7 provided at the lower end of the hole position through the bearing seat fixing plate 6, and the bearing seat C9 is used to load the boring bar 3; for the hole to be machined with repair tooling installed at one end and inside the hole, the lower adjustment component includes a bearing seat B8. The bearing seat B8 is arranged inside the hole position, and both ends of the bearing seat B8 abut against the inner wall of the hole position. The bearing seat B8 is used to load the boring bar 3.

[0055] Step Two: Install the dial indicator 5 and adjust the centrality of the boring bar 3 through the dial indicator 5;

[0056] Step 2.1: With the inner hole of the hole to be machined as the reference, install a dial indicator 5 on the inner sides of the tooling plates 7 at the upper and lower ends of the hole to be measured respectively;

[0057] Step 2.2: Slowly rotate the boring bar 3, select 4 points on the inner circle of the hole to be machined, read the readings of the dial indicator 5 at these 4 positions, and judge whether the boring bar 3 is at the center of the machining hole;

[0058] Step 2.3: According to the measurement results of the dial indicator 5, roughly adjust the concentricity of the boring bar 3 by adjusting the tooling plate 7;

[0059] Step 2.4: Fine-tune the concentricity of the boring bar 3 by adjusting the bearing seat A2 and the bearing seats of the lower adjustment component, and ensure that the maximum deviation of the measurement results of the dial indicator 5 when rotating one week is within 0.1 mm relative to the measurement results at both ends;

[0060] Step Three: Use the boring machine 10 to repair the hole to be measured;

[0061] Step 3.1: Install the spindle box and feed box of the boring machine 10 at the hole to be machined, and check the no-load operation of the equipment by power-on inspection;

[0062] Step 3.2: Paint the inner surface of the hole to be machined with an oil-based pen, align the tip of the boring tool at the painted position, and use the slight scoring of the tip of the boring tool at the painted position as the reference. The first feed amount is processed with reference to the data measured by the dial indicator 5;

[0063] Step 3.3: After the first machining, measure the inner diameter of the hole to be machined with an internal micrometer, and process according to the measured data until the hole to be machined meets the standard dimensions of the drawing.

[0064] Step 4: After the machining of the hole to be processed is qualified, power off the equipment, move the equipment to other hole positions to be processed, and then remove the equipment and clean the site after all hole positions are machined.

[0065] This tooling uses the method of rough adjustment with a fixed tooling plate 7 and fine adjustment with a bearing block, and measures with a dial indicator 5. The highest roundness machining accuracy of this tooling is 0.05 mm, and the surface roughness is R screw 1.6 - 3.2. Moreover, this tooling includes two assembly methods. Installing the fixed tooling on both end faces can process through holes, and the machining method of installing the fixed tooling inside the hole and on the upper end face is applicable to the machining of the lower part of the hole position, and the machining accuracy can be further improved.

[0066] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent of the present invention shall be subject to the appended claims.

Claims

1. A nuclear reactor stretching machine hole repair tool, characterized in that: The tooling comprises a bearing seat A (2), four fixed tooling plates (7), two screw rods (1) and a lower adjustment assembly. Two fixed tooling plates (7) are respectively arranged at the corresponding positions at the upper and lower ends of the hole, and the fixed tooling plates (7) corresponding to the upper and lower ends of the hole are connected by the screw rods (1); the two fixed tooling plates (7) at the upper ends of the hole are respectively connected to the bearing seat A (2), the bearing seat A (2) is used to load the boring bar (3) of the boring machine (10), the bearing seat A (2) is used for fine adjustment of the boring bar (3), and the fixed tooling plates (7) are used for coarse adjustment of the boring bar (3); the lower adjustment assembly is arranged at the lower section of the boring bar (3), and the lower adjustment assembly is used to fix and adjust the boring bar (3).

2. A nuclear reactor tensile machine hole repair tool according to claim 1, characterized in that: The bearing seat A (2) and the fixed tooling plate (7) are connected via a bearing seat fixing plate (6).

3. A nuclear reactor tensile machine hole repair tool according to claim 1, characterized in that: The lower adjustment assembly comprises a bearing seat fixing plate (6) and a bearing seat C (9), wherein the bearing seat C (9) is respectively connected to two fixed tooling plates (7) arranged at the lower end of the hole through the bearing seat fixing plate (6), and the bearing seat C (9) is used to load the boring bar (3).

4. A nuclear reactor stretching machine hole repair tool according to claim 1, characterized in that: The lower adjustment assembly comprises a bearing seat B (8), which is arranged inside the hole, with two ends of the bearing seat B (8) abutting against the inner wall of the hole, and the bearing seat B (8) is used to load the boring bar (3).

5. The hole repair tool for a nuclear reactor stretching machine according to claim 1, characterized in that: A dial indicator (5) is provided on the inner side of the fixed tooling plate (7) at the upper end and the lower end of the hole, respectively. The dial indicator (5) is used to judge whether the boring bar (3) is at the center of the processing hole.

6. A nuclear reactor stretching machine hole repair tool according to claim 1, characterized in that: The screw rod (1) passes through adjacent holes on both sides of the hole to be processed, and is fixed to the fixed tooling plates (7) at the upper and lower ends of the hole to be processed by nuts.

7. A method for repairing a hole repair tool for a nuclear reactor stretching machine, characterized in that: The method comprises: Step 1: Install the tooling according to the hole position to be tested of the stretching machine; Step 2: Install the dial indicator (5) and adjust the center degree of the boring bar (3) using the dial indicator (5); Step 2.1: Install one dial indicator (5) on the inner side of the fixed tooling plate (7) at the upper end and the lower end of the hole to be measured respectively; Step 2.2: Rotate the boring bar (3) at a low speed, select four points on the inner circle of the hole to be processed, read the readings of the dial indicator (5) at these four positions, and determine whether the boring bar (3) is at the center of the processed hole; Step 2.3: According to the measurement result of the dial indicator (5), the concentricity of the boring bar (3) is roughly adjusted by adjusting the fixed fixture plate (7); Step 2.4: Fine-tune the concentricity of the boring bar (3) by adjusting the bearing seat A (2) and the bearing seat of the lower adjustment assembly; Step 3: using a boring machine (10) to repair the hole to be tested; Step 3.1: Install the boring machine (10) at the hole to be processed, and check the power supply and idling of the equipment; Step 3.2: Use an oil pen to color the inner surface of the hole to be processed, and align the boring tool tip at the colored position, with the boring tool tip having a slight mark at the colored position as a reference, and the first feed amount of the boring tool is processed with reference to the data measured by the dial indicator (5); Step 3.3: After the first processing, use an internal micrometer to measure the inner diameter of the hole to be processed, and process according to the measured data until the hole to be processed meets the standard size of the drawing.

8. The method for repairing a hole repair tool for a nuclear reactor stretching machine according to claim 7, characterized in that: The step 1 of installing the tooling according to the hole position of the stretching machine specifically includes: Step 1.1: Weld the bearing seat A (2) onto the fixed tooling plate (7) through the bearing seat fixing plate (6); Step 1.2: Pass the screw rod (1) through the adjacent holes on both sides of the hole to be processed and the fixed tooling plate (7), and lock the screw rod (1) on the fixed tooling plate (7) with a nut; Step 1.3: Install a boring bar (3) of a boring machine (10) at the hole to be processed, install a suitable lower adjustment component at the lower section of the boring bar (3) according to the position of the hole to be processed, and adjust the fixed tooling plate (7) to roughly adjust the concentricity of the boring bar (3).

9. The method for repairing a hole repair tool for a nuclear reactor stretching machine according to claim 7, characterized in that: In step 2.4, the concentricity of the boring bar (3) is fine-tuned by adjusting the bearing seat A (2) and the bearing seat of the lower adjustment assembly to ensure that the maximum deviation of the measurement results at both ends of the measurement result after the dial indicator (5) rotates one circle is within 0.1 mm.

10. The method for repairing a hole repair tool for a nuclear reactor stretching machine according to claim 8, characterized in that: The installation of a suitable lower adjustment component in step 1.3 is specifically as follows: for a through hole with repair tooling installed on both sides, the lower adjustment component includes a bearing seat fixing plate (6) and a bearing seat C (9), the bearing seat C (9) is respectively connected to the two fixing tooling plates (7) arranged at the lower end of the hole through the bearing seat fixing plate (6), and the bearing seat C (9) is used to load the boring bar (3); for a hole to be processed with a repair tooling installed at one end and installed in the hole, the lower adjustment component includes a bearing seat B (8), the bearing seat B (8) is arranged inside the hole, the two ends of the bearing seat B (8) are against the inner wall of the hole, and the bearing seat B (8) is used to load the boring bar (3).

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