Laser cutting separation method and rotary cutting platform

Abstract

The embodiment of the invention provides a laser cutting separation method and a rotary cutting platform. The laser cutting and separating method is used for cutting an outer sleeve of a fast reactor assembly. The laser cutting and separating method comprises the following steps that the fast reactor assembly is clamped through a clamping assembly. And the clamping assembly is controlled to rotate so as to drive the fast reactor assembly to rotate relative to the laser cutting assembly. And the laser cutting assembly is controlled to conduct ring cutting on the outer sleeve. According to the laser cutting separation method, the outer sleeve can be conveniently detached.

Description

Technical Field

[0001] The present application relates to the field of laser cutting technology, and in particular to a laser cutting separation method and a rotating cutting platform. Background Art

[0002] The disassembly and shearing of fast neutron reactor (fast reactor) components is an essential part of the reprocessing of fast reactor spent fuel. However, the fast reactor components have a large mass of hexagonal outer sleeves. If these outer sleeves are not removed before the element rods are sheared, the burden on the shearing tools will be significantly increased, the failure rate of mechanical shearing will be increased, and the service life of the shearing machine will be shortened. In addition, the sheared outer shell will form a hexagonal ring of about 130 mm in length. These rings are large in size and may block the dissolver feed port or cause jams in the continuous dissolver.

[0003] In the related art, in the post-processing of the fast reactor assembly, the end fittings and hexagonal outer sleeve of the fast reactor assembly are removed by disassembly, and then the element rods are cut into short sections. For the step of removing the outer sleeve of the fast reactor assembly, the related art uses a mechanical method to remove the outer sleeve. However, the fast reactor assembly is made of stainless steel. During the mechanical disassembly process, the outer sleeve is easily deformed uncontrollably and cannot be disassembled smoothly. Summary of the invention

[0004] In view of this, the main purpose of the embodiments of the present application is to provide a laser cutting separation method and a rotating cutting platform that can facilitate the disassembly of the outer sleeve.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a laser cutting and separation method for cutting an outer sleeve of a fast reactor assembly. The laser cutting and separation method comprises the following steps:

[0007] Clamping the fast reactor assembly by a clamping assembly;

[0008] Controlling the rotation of the clamping assembly to drive the fast reactor assembly to rotate relative to the laser cutting assembly;

[0009] The laser cutting assembly is controlled to perform circular cutting on the outer sleeve.

[0010] In one embodiment, the outer sleeve has a containing cavity, the containing cavity includes a first sub-cavity and a second sub-cavity, the element rod of the fast reactor assembly is located in the first sub-cavity, the lower grid plate of the fast reactor assembly is located in the second sub-cavity, and controlling the laser cutting assembly to perform ring cutting on the outer sleeve specifically includes:

[0011] The laser cutting assembly is controlled to perform circular cutting at the cavity body of the second sub-cavity.

[0012] In one embodiment, the clamping assembly includes a first chuck and a second chuck, the outer sleeve includes a first end and a second end, the first end is connected to the upper end of the fast reactor assembly, the first chuck is fixed to the upper end, and the second chuck is fixed to the second end, and the laser cutting separation method includes:

[0013] Controlling the laser cutting assembly to perform circular cutting on the outer sleeve to separate the first end from the second end;

[0014] Controlling the first chuck to move to a first set position relative to the second chuck to drive the upper end head and the first end to move toward a side away from the second end, so that a portion of the element rod of the fast reactor assembly is located inside the first end and another portion of the element rod is exposed;

[0015] Bundling the element rods by means of a fixing assembly;

[0016] The first chuck is controlled to move to a second set position relative to the second chuck, so as to drive the upper end head and the first end to move toward a side away from the second end, so that the first end is separated from the element rod.

[0017] In one embodiment, when the first chuck is located at the first set position, the length of the exposed area of ​​the element rod is 3 / 4 of the length of the element rod.

[0018] In one embodiment, the cutting speed of the laser cutting assembly for circular cutting the outer sleeve is greater than or equal to 3.5 m / min and less than 5.5 m / min; and / or,

[0019] The focal position of the laser cutting assembly is greater than or equal to -2.5 mm and less than -0.5 mm; and / or,

[0020] The power of the laser cutting assembly is greater than 3600W and less than or equal to 6000W; and / or,

[0021] The auxiliary gas of the laser cutting assembly is one of nitrogen and air; and / or,

[0022] The air pressure of the laser cutting assembly is greater than 10 MPa and less than or equal to 18 MPa.

[0023] In one embodiment, the cutting speed is 4.5 m / min, the focal position is -1.5 mm, the power is 4800 W, the auxiliary gas is nitrogen, and the gas pressure is 15 MPa.

[0024] In one embodiment, the laser cutting and separation method further comprises the following steps:

[0025] The process parameters of the laser cutting assembly for ring cutting the outer sleeve are determined by orthogonal experiment; wherein the experimental factors of the orthogonal experiment include at least one of the cutting speed, the focal position, the power, the auxiliary gas and the gas pressure.

[0026] In one embodiment, the clamping assembly includes a first chuck, a second chuck and a clamping mechanism, the outer sleeve includes a first end and a second end, the first end is connected to the upper end of the fast reactor assembly, the first chuck is fixed on the upper end, the second chuck is fixed on the second end, and the clamping mechanism is clamped at the end of the fast reactor assembly away from the upper end.

[0027] In one embodiment, the laser cutting head of the laser cutting assembly is mounted on a follower chuck, and in the process of clamping the fast reactor assembly by the clamping assembly, the laser cutting separation method further comprises:

[0028] The follower chuck is controlled to clamp the lower end of the fast reactor assembly.

[0029] A second aspect of an embodiment of the present application provides a rotating cutting platform for use in any of the above-described laser cutting and separation methods, wherein the rotating cutting platform comprises a clamping assembly and a laser cutting assembly, wherein the clamping assembly is used to clamp the fast reactor assembly, and the laser cutting assembly is used to perform ring cutting on the outer sleeve.

[0030] The embodiment of the present application provides a laser cutting separation method and a rotating cutting platform, and the laser cutting separation method includes the following steps: clamping the fast reactor assembly by a clamping assembly. Controlling the rotation of the clamping assembly to drive the fast reactor assembly to rotate relative to the laser cutting assembly. Controlling the laser cutting assembly to perform circumcision on the outer sleeve. On the one hand, the speed of cutting the outer sleeve by laser is fast, the secondary pollution waste and water volume are small, and there is no deformation or residual stress on the cutting surface, so that the outer sleeve can be easily disassembled smoothly. In addition, laser cutting adopts optical fiber transmission, which can be applied to difficult-to-reach or highly radioactive areas, and its non-contact characteristics also extend the service life of the cutting tool. On the other hand, by driving the fast reactor assembly to rotate by the clamping assembly, the laser cutting assembly can perform one-step circumcision on the outer sleeve, which can greatly reduce the laser cutting action and extend the life of the laser cutting device, thereby further improving the convenience of outer sleeve disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of a laser cutting and separation method according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] An embodiment of the present application provides a laser cutting separation method, see Figure 1, used for cutting the outer sleeve of a fast reactor assembly, the laser cutting and separation method comprises the following steps:

[0033] Step S1: clamping the fast reactor assembly by a clamping assembly.

[0034] Step S2: Control the rotation of the clamping assembly to drive the fast reactor assembly to rotate relative to the laser cutting assembly.

[0035] Step S3: Control the laser cutting assembly to perform circular cutting on the outer sleeve.

[0036] Another embodiment of the present application provides a rotating cutting platform, which is used for the laser cutting and separation method described in any embodiment of the present application. The rotating cutting platform includes a clamping assembly and a laser cutting assembly. The clamping assembly is used to clamp the fast reactor assembly, and the laser cutting assembly is used to perform ring cutting on the outer sleeve.

[0037] Specifically, the specific structure of the fast reactor assembly can be determined according to actual conditions.

[0038] Exemplarily, the fast reactor assembly includes an upper end head, an outer sleeve and a lower end head, the upper end head and the lower end head are respectively located at opposite ends of the outer sleeve, the outer sleeve has a receiving cavity, and the fast reactor assembly also includes an upper grid plate, a lower grid plate and an element rod, the upper grid plate and the lower grid plate are spaced apart in the receiving cavity, and the element rod is located at the interval between the upper grid plate and the lower grid plate.

[0039] The clamping assembly can drive the fast reactor assembly to rotate while clamping the fast reactor assembly. The laser cutting assembly can laser cut the outer sleeve. Thus, when the clamping assembly drives the fast reactor assembly to rotate, the fast reactor assembly can rotate relative to the laser cutting assembly, so that the laser cutting assembly can perform annular cutting on the outer sleeve along the circumference of the outer sleeve.

[0040] According to the actual setting, the laser cutting assembly can perform one-step circumferential cutting on the outer sleeve, that is, the clamping assembly drives the fast reactor assembly to rotate one circle, and the outer sleeve can be cut along the circumference of the outer sleeve. Of course, in some embodiments, the clamping assembly can also drive the fast reactor assembly to rotate n circles (n≥2) to cut the outer sleeve along the circumference of the outer sleeve.

[0041] In addition, since the laser cutting assembly is used to laser cut the outer sleeve, when laser cutting is not in use, the laser cutting head, optical fiber and other components of the laser cutting assembly can be moved away from the fast reactor assembly, thereby greatly increasing the life of the laser cutting assembly.

[0042] The laser cutting separation method of the embodiment of the present application includes the following steps: clamping the fast reactor assembly by a clamping assembly. Controlling the rotation of the clamping assembly to drive the fast reactor assembly to rotate relative to the laser cutting assembly. Controlling the laser cutting assembly to perform circumcision on the outer sleeve. On the one hand, the speed of cutting the outer sleeve by laser is fast, the secondary pollution waste and water volume are small, and there is no deformation or residual stress on the cutting surface, so it is easy to disassemble the outer sleeve smoothly. In addition, laser cutting adopts optical fiber transmission, which can be applied to difficult-to-reach or highly radioactive areas, and its non-contact characteristics also extend the service life of the cutting tool. On the other hand, by driving the fast reactor assembly to rotate by the clamping assembly, the laser cutting assembly can perform one-step circumcision on the outer sleeve, which can greatly reduce the laser cutting action and extend the life of the laser cutting device, thereby further improving the convenience of disassembly of the outer sleeve.

[0043] In one embodiment, the outer sleeve has a containing cavity, the containing cavity includes a first sub-cavity and a second sub-cavity, the element rod of the fast reactor assembly is located in the first sub-cavity, and the lower grid plate of the fast reactor assembly is located in the second sub-cavity, and controlling the laser cutting assembly to perform ring cutting on the outer sleeve specifically includes the following steps:

[0044] The laser cutting assembly is controlled to perform circular cutting at the cavity body of the second sub-cavity.

[0045] Specifically, the accommodating cavity is used to install the lower grid plate and the element rod, wherein the element rod is installed in the first sub-cavity, and the lower grid plate is installed in the second sub-cavity. It should be noted that the first sub-cavity and the second sub-cavity are interconnected cavities, which are only used to distinguish the area where the element rod is installed from the area where the lower grid plate is installed.

[0046] By controlling the laser cutting assembly to perform circular cutting on the outer sleeve at the area where the lower grid is installed, the internal element rods are basically not damaged during the laser cutting process. In addition, the cutting position is at the lower grid, rather than cutting at the place where the element rods are inside, which can greatly reduce the risk of fuel leakage from the element rods and contaminating the hot chamber.

[0047] In a specific embodiment, the cutting position of the laser cutting assembly is 50 mm away from the weld between the outer sleeve and the lower end, and the cutting depth is 3 mm.

[0048] In one embodiment, the clamping assembly includes a first chuck and a second chuck, the outer sleeve includes a first end and a second end, the first end is connected to the upper end of the fast reactor assembly, the first chuck is fixed on the upper end, and the second chuck is fixed on the second end, and the laser cutting separation method includes:

[0049] Step S1: controlling the laser cutting assembly to perform circular cutting on the outer sleeve to separate the first end from the second end.

[0050] Step S2: Control the first chuck to move to a first set position relative to the second chuck to drive the upper end and the first end to move toward a side away from the second end, so that a partial area of ​​the element rod of the fast reactor assembly is located inside the first end and another partial area of ​​the element rod is exposed.

[0051] Step S3: Bundle the component rods by fixing the components.

[0052] Step S4: Control the first chuck to move to a second set position relative to the second chuck to drive the upper end and the first end to move toward a side away from the second end, so that the first end is separated from the element rod.

[0053] Specifically, the clamping assembly fixes the fast reactor assembly through a chuck structure, thereby clamping the fast reactor assembly. The fixing of the first chuck and the second chuck can prevent the outer sleeve from falling off after being circumcised.

[0054] After controlling the laser cutting assembly to perform circular cutting on the outer sleeve, the outer sleeve can be divided into two sections, thereby separating the first end from the second end.

[0055] Therefore, by controlling the relative movement between the first chuck and the second chuck, the first chuck and the second chuck can be moved away from each other, the cut portion of the outer sleeve can be gradually expanded, and a partial area of ​​the element rod can be exposed from the cut portion to the outside of the outer sleeve.

[0056] It should be noted that a plurality of element rods are arranged in the outer sleeve, and the first chuck is first controlled to move to the first set position, at which time only a part of the element rod is exposed, and a part of the element rod is located inside the first end, so that the element rod can be constrained by the first end to prevent the element rods from spreading out. The element rods are bundled by the fixing assembly, and then the first chuck is controlled to move to the second set position. In this way, the element rods will not spread out after the first end is separated from the element rods.

[0057] It can be understood that the second setting position is a position that can completely separate the first end and the element rod. Compared with the first setting position, the first chuck is farther away from the second chuck in the second setting position.

[0058] It should be noted that the specific position of the first set position can be set according to actual conditions.

[0059] Exemplarily, when the first chuck is located at the first set position, the length of the exposed area of ​​the element rod is 3 / 4 of the length of the element rod. Thus, it is convenient for the fixing assembly to bundle the element rods.

[0060] In one embodiment, the cutting speed of the laser cutting assembly for circular cutting the outer sleeve is greater than or equal to 3.5 m / min and less than 5.5 m / min. For example, 3.5 m / min, 4.5 m / min or 5 m / min. It should be noted that controlling the cutting speed within the above range can better facilitate the laser cutting assembly to cut through the outer sleeve, and can reduce the risk of the outer sleeve not being cut through.

[0061] In one embodiment, the focal position of the laser cutting component is greater than or equal to -2.5 mm and less than -0.5 mm, such as -2.5 mm, -1.5 mm or -1 mm. It should be noted that controlling the focal position within the above range can better facilitate the laser cutting component to cut through the outer sleeve, and can reduce the risk of the outer sleeve not being cut through.

[0062] In one embodiment, the power of the laser cutting assembly is greater than 3600 W and less than or equal to 6000 W. For example, 4000 W, 4800 W or 6000 W. It should be noted that controlling the power within the above range can better facilitate the laser cutting assembly to cut through the outer sleeve, and can reduce the risk of the outer sleeve not being cut through.

[0063] In one embodiment, the auxiliary gas of the laser cutting assembly is nitrogen or air. It should be noted that using nitrogen or air as the auxiliary gas can facilitate cutting.

[0064] In one embodiment, the air pressure of the laser cutting assembly is greater than 10 MPa and less than or equal to 18 MPa, such as 15 MPa or 18 MPa. It should be noted that using the air pressure within the above range can facilitate cutting.

[0065] In one embodiment, the laser cutting separation method further comprises the following steps:

[0066] The process parameters of the laser cutting assembly for circular cutting of the outer sleeve are determined by orthogonal experiment; wherein the experimental factors of the orthogonal experiment include at least one of the cutting speed, focus position, power, auxiliary gas and gas pressure.

[0067] Specifically, the process parameters of the laser cutting separation method are obtained through orthogonal experiments, and different laser cutting parameters are used to cut a simulated outer sleeve containing simulated component rods inside. The final cutting parameters can only slightly damage the wire winding when there are component rods under the outer sleeve, and the cut surface has less slag and low roughness, which will not affect the extraction of the outer sleeve.

[0068] The orthogonal test mainly examines the effects of cutting speed, focus position, power, auxiliary gas medium type and gas pressure on cutting quality. According to the actual situation, the test factors of the orthogonal test can include one of the above factors, or multiple or all of the above factors.

[0069] It should be noted that other parameters such as the ratio of cutting head lenses and optical fiber core diameter can remain unchanged. The experimental results can be obtained by visual observation, roughness meter measurement and optical microscope measurement to obtain the component rod cutting damage, wire winding cutting damage, slit width, cut surface roughness, cut surface slag amount (mm), etc. under different experimental conditions, thereby comprehensively considering factors such as cutting quality.

[0070] It can be seen that the process parameters obtained by orthogonal test can not only ensure efficient cutting of the outer sleeve, but also ensure that the slit width is small enough, the cutting surface roughness, and the amount of slag are small enough. In this way, the laser cutting time is guaranteed, and the small slit width ensures less debris, which makes the later cleaning of the hot chamber much easier. At the same time, the roughness of the cutting surface and the amount of slag are small enough to minimize the risk of scratching the component rod during the dragging of the outer sleeve.

[0071] In a specific embodiment, the parameters of the orthogonal test are as follows.

[0072] Table 1. Table of fixed parameters of orthogonal test

[0073] Fixed parameters value Cutting head lens ratio 1:2 Fiber core diameter (μm) 100 Cutting height (mm) 1 Cutting nozzle diameter (mm) 3 Duty cycle (%) 50 Pulse frequency (Hz) 4000

[0074] Table 2 Experimental factors of orthogonal experiment

[0075]

[0076] Table 3 Cutting results

[0077]

[0078] In one embodiment, the cutting speed is 4.5 m / min, the focal position is -1.5 mm, the power is 4800 W, the auxiliary gas is nitrogen, and the gas pressure is 15 MPa.

[0079] Specifically, according to the orthogonal test results, the cutting speed, focus position, power, auxiliary gas and gas pressure are determined to adopt the above-mentioned cutting process conditions respectively, which can ensure the cutting quality and cutting speed to the greatest extent.

[0080] In one embodiment, the clamping assembly includes a first chuck, a second chuck and a clamping mechanism, the outer sleeve includes a first end and a second end, the first end is connected to the upper end of the fast reactor assembly, the first chuck is fixed on the upper end, the second chuck is fixed on the second end, and the clamping mechanism is clamped at the end of the fast reactor assembly away from the upper end.

[0081] Specifically, while the fast reactor assembly is fixed by the first chuck and the second chuck, the fast reactor assembly is also clamped by the clamping mechanism, thereby further improving the stability of the fast reactor assembly during the cutting process and reducing the occurrence of shaking.

[0082] The clamping mechanism is clamped at the end of the fast reactor assembly, and is clamped at the end away from the upper end.

[0083] In one embodiment, the laser cutting head of the laser cutting assembly is mounted on a follower chuck, and in the process of clamping the fast reactor assembly by the clamping assembly, the laser cutting separation method further comprises the following steps:

[0084] The follower chuck is controlled to clamp the lower end of the fast reactor assembly, thereby further improving the stability of the fast reactor assembly during the cutting process and reducing the occurrence of shaking.

[0085] In the description of the present application, the description with reference to the terms "in one embodiment", "in some embodiments", "in a specific embodiment", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0086] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A laser cutting and separation method for cutting the outer sleeve of a fast reactor assembly, characterized in that: The laser cutting separation method comprises the following steps: Clamping the fast reactor assembly by a clamping assembly; Controlling the rotation of the clamping assembly to drive the fast reactor assembly to rotate relative to the laser cutting assembly; The laser cutting assembly is controlled to perform circular cutting on the outer sleeve.

2. The laser cutting and separation method according to claim 1, characterized in that: The outer sleeve has a containing cavity, the containing cavity includes a first sub-cavity and a second sub-cavity, the element rod of the fast reactor assembly is located in the first sub-cavity, the lower grid plate of the fast reactor assembly is located in the second sub-cavity, and the controlling the laser cutting assembly to perform ring cutting on the outer sleeve specifically includes: The laser cutting assembly is controlled to perform circular cutting at the cavity body of the second sub-cavity.

3. The laser cutting and separation method according to claim 1 or 2, characterized in that: The clamping assembly includes a first chuck and a second chuck, the outer sleeve includes a first end and a second end, the first end is connected to the upper end of the fast reactor assembly, the first chuck is fixed on the upper end, and the second chuck is fixed on the second end, and the laser cutting separation method includes: Controlling the laser cutting assembly to perform circular cutting on the outer sleeve to separate the first end from the second end; Controlling the first chuck to move to a first set position relative to the second chuck to drive the upper end head and the first end to move toward a side away from the second end, so that a portion of the element rod of the fast reactor assembly is located inside the first end and another portion of the element rod is exposed; Bundling the element rods by means of a fixing assembly; The first chuck is controlled to move to a second set position relative to the second chuck, so as to drive the upper end head and the first end to move toward a side away from the second end, so that the first end is separated from the element rod.

4. The laser cutting and separation method according to claim 3, characterized in that: When the first chuck is located at the first set position, the length of the exposed area of ​​the element rod is 3 / 4 of the length of the element rod.

5. The laser cutting and separation method according to claim 1 or 2, characterized in that: The cutting speed of the laser cutting assembly for circular cutting the outer sleeve is greater than or equal to 3.5 m / min and less than 5.5 m / min; and / or, The focal position of the laser cutting assembly is greater than or equal to -2.5 mm and less than -0.5 mm; and / or, The power of the laser cutting assembly is greater than 3600W and less than or equal to 6000W; and / or, The auxiliary gas of the laser cutting assembly is one of nitrogen and air; and / or, The air pressure of the laser cutting assembly is greater than 10 MPa and less than or equal to 18 MPa.

6. The laser cutting and separation method according to claim 5, characterized in that: The cutting speed is 4.5 m / min, the focal position is -1.5 mm, the power is 4800 W, the auxiliary gas is nitrogen, and the gas pressure is 15 MPa.

7. The laser cutting and separation method according to claim 5, characterized in that: The laser cutting separation method also includes the following steps: The process parameters of the laser cutting assembly for ring cutting the outer sleeve are determined by orthogonal experiment; wherein the experimental factors of the orthogonal experiment include at least one of the cutting speed, the focal position, the power, the auxiliary gas and the gas pressure.

8. The laser cutting and separation method according to claim 1 or 2, characterized in that: The clamping assembly includes a first chuck, a second chuck and a clamping mechanism, the outer sleeve includes a first end and a second end, the first end is connected to the upper end of the fast reactor assembly, the first chuck is fixed on the upper end, the second chuck is fixed on the second end, and the clamping mechanism is clamped at the end of the fast reactor assembly away from the upper end.

9. The laser cutting and separation method according to claim 8, characterized in that: The laser cutting head of the laser cutting assembly is mounted on a follower chuck. In the process of clamping the fast reactor assembly by the clamping assembly, the laser cutting separation method further comprises: The follower chuck is controlled to clamp the lower end of the fast reactor assembly.

10. A rotating cutting platform, used in the laser cutting and separation method according to any one of claims 1 to 9, characterized in that: The rotary cutting platform comprises a clamping assembly and a laser cutting assembly, wherein the clamping assembly is used for clamping the fast reactor assembly, and the laser cutting assembly is used for performing annular cutting on the outer sleeve.

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