Niobium flange sealing groove machining method

Abstract

The invention belongs to the technical field of part machining, and discloses a niobium flange sealing groove machining method. The niobium flange sealing groove machining method comprises the following steps that a cutter is controlled to cut a niobium flange at the to-be-machined position of a sealing groove according to a preset method, and cooling liquid is continuously poured into the cutter in the cutting process; and the groove wall of the sealing groove is polished through a polishing tool. The preset method comprises the following steps that S21, a cutter is controlled to cut the niobium flange in N sections in the width direction of the sealing groove, the cutting width of each section is B, and the cutting depth of each section is gradually increased in an arithmetic progression with the tolerance being H; b is 1 / N of the width of the sealing groove, and H is 1 / N of the depth of the sealing groove; and S22, the step S21 is repeatedly executed for N-1 times in total according to the mode that the number of the segments is decreased step by step in the arithmetic progression till machining of the sealing groove is completed, and the tolerance of the number of the segments is 1. The niobium flange sealing groove machining method can reduce the abrasion degree of the cutter, prolong the service life of the cutter and guarantee the machining precision of the sealing groove.

Description

Technical Field

[0001] The present invention relates to the technical field of part processing, and particularly to a processing method for a niobium flange sealing groove. Background Art

[0002] A niobium flange is a flange connecting piece mainly made of a rare metal niobium. With its excellent characteristics such as high temperature resistance and strong corrosion resistance, it shows irreplaceable advantages in high-tech fields such as aerospace, nuclear power industry, chemical engineering and petroleum, and medical equipment.

[0003] At present, the manufacturing process of niobium flanges mainly includes three key links: forging, casting and machining. Among them, in the machining link, the precision machining of the end face sealing groove of the niobium flange needs to be completed. As a key part for installing the sealing gasket, the machining quality of the sealing groove directly affects the sealing performance of the niobium flange connection, so extremely high requirements are put forward for the machining accuracy of the niobium flange sealing groove. However, the metal niobium itself has characteristics such as high hardness, high melting point and easy oxidation. These characteristics not only significantly increase the difficulty of high-precision machining of the sealing groove, but also accelerate the tool wear during the machining process, greatly shortening the tool service life and posing a severe challenge to actual production.

[0004] Therefore, there is an urgent need for a processing method for a niobium flange sealing groove to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a processing method for a niobium flange sealing groove, which can reduce the tool wear degree, extend the tool service life, ensure the machining accuracy of the sealing groove, and improve the finished product rate of the niobium flange.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A processing method for a niobium flange sealing groove is provided, including the following steps:

[0008] S1. Install the niobium flange to be processed on the processing equipment;

[0009] S2. Control the tool of the processing equipment to cut the niobium flange at the position where the sealing groove is to be processed according to a preset method, and continuously pour coolant on the tool during the cutting process;

[0010] The preset method includes the following steps:

[0011] S21. Control the tool to cut the niobium flange in N segments along the width direction of the sealing groove, and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H; wherein, B is 1 / N of the width of the sealing groove, H is 1 / N of the depth of the sealing groove, and N is a positive integer greater than 1;

[0012] S22. Repeat step S21 a total of N - 1 times in the manner of decreasing step by step in an arithmetic progression according to the number of segmented sections, until the sealing groove is machined, where the common difference of the number of segmented sections is 1;

[0013] S3. Use a grinding tool to grind the groove wall of the sealing groove.

[0014] Optionally, in step S21, the tool cuts a stepped groove on the niobium flange, and the stepped groove includes N groove sections;

[0015] The preset method includes the following steps:

[0016] S21110. Control the tool to cut the niobium flange in N segments along the width direction of the sealing groove, and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a common difference of H;

[0017] S21120. Measure the width value D1 of each groove section, and determine whether there is a first difference between each D1 and B. If so, set the groove section with D1 different from B as the first error section, and sequentially execute step S22111 and step S22112. If not, directly execute step S22120;

[0018] S22111. Determine the position of the first error section, control the tool to cut the niobium flange in N - 1 segments along the width direction of the sealing groove, the cutting width of each segment is B, the cutting depth of each segment increases step by step in an arithmetic progression with a common difference of H, and at the first error section, change the cutting width of the tool to X1, where X1 is the absolute value obtained by subtracting the first difference from B;

[0019] S22112. Repeat step S21110 and step S21120 a total of N - 2 times in the manner of starting from N - 2 and decreasing step by step in an arithmetic progression according to the number of segmented sections, until the sealing groove is machined;

[0020] S22120. Repeat step S21110 and step S21120 a total of N - 1 times in the manner of decreasing step by step in an arithmetic progression according to the number of segmented sections, until the sealing groove is machined.

[0021] Optionally, in step S21, the tool cuts a stepped groove on the niobium flange, and the stepped groove includes N groove sections;

[0022] The preset method includes the following steps:

[0023] S21210. Control the tool to cut the niobium flange in N segments along the width direction of the sealing groove, and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a common difference of H;

[0024] S21220. Measure the depth value D2 of each slot section, and determine whether there is a second difference between each D2 and H. If so, set the slot sections where D2 and H are different as the second error sections, and sequentially execute step S22211 and step S22212. If not, directly execute step S22220;

[0025] S22211. Determine the positions of the second error sections, control the tool to cut the niobium flange in N - 1 sections along the width direction of the seal groove, the cutting width of each section is B, the cutting depth of each section increases step by step in an arithmetic progression with a common difference of H, and at the second error sections, change the cutting depth of the tool to X2, where X2 is the absolute value of the subtraction of the second difference from H;

[0026] S22212. Repeat the execution of step S21210 and step S21220 a total of N - 2 times in the manner of starting from N - 2 and decreasing step by step in an arithmetic progression until the seal groove machining is completed;

[0027] S22220. Repeat the execution of step S21210 and step S21220 a total of N - 1 times in the manner of decreasing step by step in an arithmetic progression until the seal groove machining is completed.

[0028] Optionally, in step S21, after cutting each section, control the tool to move above the niobium flange.

[0029] Optionally, the processing equipment includes a bracket and a tool detachably arranged on the bracket;

[0030] Before step S1, the following steps are further included: Select a tool according to the material of the niobium flange and the width of the seal groove. The width of the tool is 0.2 mm to 2.0 mm smaller than the width of the seal groove, and install the tool on the bracket.

[0031] Optionally, before step S2, the following steps are further included: Determine the feed rate, depth of cut, and cutting speed of the tool according to the width and depth of the seal groove to be processed;

[0032] In step S2, control the tool to cut the niobium flange according to the feed rate, depth of cut, and cutting speed.

[0033] Optionally, step S3 specifically includes the following steps: Control the grinding tool to rotate at a preset speed to grind the groove wall of the seal groove.

[0034] Optionally, the range of the preset speed is 100 r / min to 300 r / min.

[0035] Optionally, the tool is made of cemented carbide, ceramic, or diamond.

[0036] Optionally, the grinding tool uses back - flocked sandpaper.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] The present invention provides a method for machining a niobium flange sealing groove. During the cutting process, continuously pouring coolant on the cutting tool helps to reduce the temperature on the surface of the cutting tool, reduce the wear degree of the cutting tool, maintain the stability of the cutting tool hardness, and improve the service life of the cutting tool. When cutting according to a preset method, the cutting tool can machine the sealing groove in a layered and segmented manner, so that the width and depth of each cutting of the cutting tool are significantly reduced, reducing the reverse force of the niobium flange on the cutting tool, thereby effectively reducing the deformation amount of the cutting tool and the vibration amplitude of the processing equipment. This not only further extends the service life of the cutting tool, but also helps the cutting tool to perform precise cutting to ensure the shape accuracy and position accuracy of the machined sealing groove and improve the yield rate of the niobium flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is the first flow chart of the method for machining a niobium flange sealing groove provided by the present invention;

[0040] Figure 2 is the second flow chart of the method for machining a niobium flange sealing groove provided by the present invention;

[0041] Figure 3 is the third flow chart of the method for machining a niobium flange sealing groove provided by the present invention;

[0042] Figure 4A is a schematic diagram after machining a first groove on a niobium flange by the method for machining a niobium flange sealing groove provided by the present invention;

[0043] Figure 4B is a schematic diagram after machining a second groove on a niobium flange by the method for machining a niobium flange sealing groove provided by the present invention;

[0044] Figure 4C is a schematic diagram after machining a sealing groove on a niobium flange by the method for machining a niobium flange sealing groove provided by the present invention.

[0045] In the figure:

[0046] 100, niobium flange;

[0047] 200, cutting tool;

[0048] 300, sealing groove; 301, first groove; 302, second groove; 303, third groove. DETAILED DESCRIPTION OF THE INVENTION

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0050] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0052] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0053] As Figures 1 to 4C shown, this embodiment provides a method for machining the sealing groove of a niobium flange, which can reduce the wear degree of the tool 200, extend the service life of the tool 200, ensure the machining accuracy of the sealing groove 300, and improve the yield rate of the niobium flange 100.

[0054] Referring to Figure 1 , the method for machining the sealing groove of the niobium flange includes the following steps:

[0055] S1. Install the niobium flange 100 to be machined on the processing equipment;

[0056] S2. Control the tool 200 of the processing equipment to cut the niobium flange 100 at the position to be processed of the sealing groove 300 according to a preset method, and continuously pour coolant on the tool 200 during the cutting process;

[0057] The preset method includes the following steps:

[0058] S21. Control the tool 200 to cut the niobium flange 100 in N segments along the width direction of the sealing groove 300 ( Figure 4A the X direction in it), and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H; wherein, B is 1 / N of the width of the sealing groove 300, H is 1 / N of the depth of the sealing groove 300, and N is a positive integer greater than 1;

[0059] S22. Repeat step S21 in the way that the number of segmented sections decreases step by step in an arithmetic progression for N - 1 times until the processing of the sealing groove 300 is completed, wherein the tolerance of the number of segmented sections is 1;

[0060] S3. Use a grinding tool to grind the groove wall of the sealing groove 300.

[0061] In the niobium flange sealing groove processing method provided in this embodiment, during the cutting process, continuously pouring coolant on the tool 200 helps to reduce the temperature on the surface of the tool 200, reduce the wear degree of the tool 200, maintain the stability of the hardness of the tool 200, and improve the service life of the tool 200. When cutting according to the preset method, the tool 200 can process the sealing groove 300 in a layered and segmented manner, so that the cutting width and depth of the tool 200 each time are significantly reduced, reducing the reverse force of the niobium flange 100 on the tool 200, thereby effectively reducing the deformation amount of the tool 200 and the vibration amplitude of the processing equipment, not only further extending the service life of the tool 200, but also helping the tool 200 to perform precise cutting to ensure the shape accuracy and position accuracy of the processed sealing groove 300 and improve the yield rate of the niobium flange 100.

[0062] In this embodiment, referring to Figure 4A 、 Figure 4B and Figure 4C , N is equal to 2, and step S2 specifically includes the following steps:

[0063] According to the position to be processed of the sealing groove 300, control the tool 200 to cut a length of B along the width direction of the sealing groove 300 ( Figure 4A the X direction in it) and cut a depth of H downward from the end face of the niobium flange 100 ( Figure 4A the Y direction in it), and a first groove 301 is formed on the niobium flange 100;

[0064] According to the position of the sealing groove 300 to be machined, control the tool 200 to cut the length of B along the width direction of the sealing groove 300 from the side wall of the first groove 301, and at the same time cut down 2H in depth from the end face of the niobium flange 100, so that a second groove 302 communicating with the first groove 301 is formed on the niobium flange 100;

[0065] According to the position of the sealing groove 300 to be machined, control the tool 200 to cut the length of B along the width direction of the sealing groove 300 and cut down H in depth from the bottom wall of the first groove 301, so that a third groove 303 communicating with both the first groove 301 and the second groove 302 is formed on the niobium flange 100. The first groove 301, the second groove 302 and the third groove 303 form the sealing groove 300.

[0066] In other embodiments, N>2, and step S2 specifically includes the following steps:

[0067] Control the tool 200 to cut the niobium flange 100 in N segments along the width direction of the sealing groove 300, and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H;

[0068] Control the tool 200 to cut the niobium flange 100 in N-1 segments along the width direction of the sealing groove 300, and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H;

[0069] Control the tool 200 to cut the niobium flange 100 in N-2 segments along the width direction of the sealing groove 300, and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H;

[0070] And so on until cutting N times.

[0071] Optionally, refer to Figure 2 , in step S21, the tool 200 cuts out a stepped groove on the niobium flange 100, and the stepped groove includes N groove segments;

[0072] The preset method includes the following steps:

[0073] S21110. Control the tool 200 to cut the niobium flange 100 in N segments along the width direction of the sealing groove 300, and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H;

[0074] S21120. Measure the width value D1 of each groove segment, and judge whether there is a first difference between each D1 and B. If so, set the groove segment with D1 different from B as the first error segment, and sequentially execute step S22111 and step S22112. If not, directly execute step S22120;

[0075] S22111. Determine the position of the first error segment, control the tool 200 to cut the niobium flange 100 in N - 1 segments along the width direction of the sealing groove 300, with the cutting width of each segment being B, and the cutting depth of each segment increasing step by step in an arithmetic progression with a common difference of H. And at the first error segment, change the cutting width of the tool 200 to X1, where X1 is the absolute value obtained by subtracting the first difference from B.

[0076] S22112. Repeat steps S21110 and S21120 a total of N - 2 times in the manner of starting from N - 2 and decreasing step by step in an arithmetic progression until the machining of the sealing groove 300 is completed.

[0077] S22120. Repeat steps S21110 and S21120 a total of N - 1 times in the manner of decreasing step by step in an arithmetic progression until the machining of the sealing groove 300 is completed.

[0078] By operating in this way, during the cutting process, the staff can monitor the cutting situation in real time and adjust the cutting width in a timely manner according to the monitoring results to compensate for the error of each step, significantly improving the machining accuracy of the sealing groove 300.

[0079] Optionally, refer to Figure 3 , in step S21, the tool 200 cuts a stepped groove on the niobium flange 100, and the stepped groove includes N groove segments.

[0080] The preset method includes the following steps:

[0081] S21210. Control the tool 200 to cut the niobium flange 100 in N segments along the width direction of the sealing groove 300, with the cutting width of each segment being B, and the cutting depth of each segment increasing step by step in an arithmetic progression with a common difference of H.

[0082] S21220. Measure the depth value D2 of each groove segment, and determine whether there is a second difference between each D2 and H. If so, set the groove segment with different D2 and H as the second error segment, and sequentially execute steps S22211 and S22212. If not, directly execute step S22220.

[0083] S22211. Determine the position of the second error segment, control the tool 200 to cut the niobium flange 100 in N - 1 segments along the width direction of the sealing groove 300, with the cutting width of each segment being B, and the cutting depth of each segment increasing step by step in an arithmetic progression with a common difference of H. And at the second error segment, change the cutting depth of the tool 200 to X2, where X2 is the absolute value obtained by subtracting the second difference from H.

[0084] S22212. Repeat step S21210 and step S21220 a total of N - 2 times in the manner of decreasing step by step in an arithmetic progression starting from N - 2 according to the number of segmented sections until the machining of the sealing groove 300 is completed;

[0085] S22220. Repeat step S21210 and step S21220 a total of N - 1 times in the manner of decreasing step by step in an arithmetic progression according to the number of segmented sections until the machining of the sealing groove 300 is completed.

[0086] By operating in this way, during the cutting process, the staff can monitor the cutting situation in real time and adjust the cutting depth in a timely manner according to the monitoring results to compensate for the error of each step, significantly improving the machining accuracy of the sealing groove 300.

[0087] Optionally, in step S21, after cutting each section, control the tool 200 to move above the niobium flange 100. By operating in this way, after the tool 200 completes one cutting section, the tool 200 can temporarily leave the niobium flange 100. On the one hand, it can avoid the collision between the tool 200 and the machined part or the unmachined part of the niobium flange 100, preventing situations such as tool 200 damage, scratches on the surface of the sealing groove 300, and scrapping of the niobium flange 100; on the other hand, it can provide a certain cutting clearance for the tool 200, which helps to reduce the temperature of the tool 200 and reduce the wear of the tool 200, thus extending the service life of the tool 200.

[0088] Optionally, the processing equipment includes a bracket and a tool 200 detachably arranged on the bracket; before step S1, the following steps are further included: select the tool 200 according to the material of the niobium flange 100 and the width of the sealing groove 300, the width of the tool 200 is 0.2 mm to 2.0 mm smaller than the width of the sealing groove 300, and install the tool 200 on the bracket. The hardness of niobium metal is relatively high. If a conventional tool 200 is selected, it is easy to be worn out quickly. Therefore, it is necessary to select a suitable tool 200 before cutting; moreover, the cutting force received by the tool 200 can also be reduced by optimizing the geometric parameters of the tool 200 such as the rake angle, clearance angle, and edge inclination angle to improve the service life of the tool 200.

[0089] When the width of the cutting tool 200 is smaller than the width of the groove, the cutting tool 200 will not come into direct contact with the groove wall during the cutting process, thus avoiding damage to the groove wall or dimensional deviation caused by overcutting or interference of the cutting tool 200, which helps to ensure the geometric shape and dimensional accuracy of the sealing groove 300 and meet the requirements of high-precision machining. With such a setting, it is also possible to reduce the length of the cutting edge involved in the work during cutting of the cutting tool 200, thereby reducing the cutting load, helping to reduce wear and breakage of the cutting tool 200, and extending the service life of the cutting tool 200; moreover, it can also reduce the heat generated during the cutting process, reduce the thermal stress, and reduce the risk of thermal deformation, which helps to maintain the geometric shape and dimensional stability of the cutting tool 200 and further improve the machining accuracy.

[0090] Exemplarily, the width of the cutting tool 200 is 0.5 mm to 1.0 mm smaller than the width of the sealing groove 300

[0091] Optionally, before step S2, the following steps are further included: determining the feed rate, depth of cut, and cutting speed of the cutting tool 200 according to the width and depth of the to-be-machined sealing groove 300; controlling the cutting tool 200 to cut the niobium flange 100 according to the feed rate, depth of cut, and cutting speed in step S2. An excessive depth of cut will increase the cutting force, resulting in increased wear of the cutting tool 200 and even possible breakage of the cutting tool 200. Therefore, it is necessary to reasonably select the depth of cut according to the depth of the sealing groove 300 to ensure the normal service life and machining stability of the cutting tool 200. The magnitude of the feed rate directly affects the thickness of the cutting layer and the cutting force. If the feed rate is too large, the thickness of the cutting layer will increase, resulting in an increase in surface roughness; if the feed rate is too small, the cutting process will become unstable, prone to vibration and ripples. Therefore, it is necessary to accurately control the feed rate according to the width of the sealing groove 300 and the machining requirements to obtain the best surface quality. If the cutting speed is too high, the cutting force and cutting temperature will increase, resulting in thermal deformation and residual stress on the surface of the sealing groove 300, affecting the sealing performance; if the cutting speed is too low, the machining efficiency will be low. Therefore, a suitable cutting speed needs to be selected for machining.

[0092] Exemplarily, the feed rate is in the range of 0.007 mm / r to 0.010 mm / r, the depth of cut is in the range of 0.15 mm to 0.20 mm, and the cutting speed is in the range of 80 r / min to 100 r / min.

[0093] Optionally, step S3 specifically includes the following steps: controlling the grinding tool to rotate at a preset speed to grind the groove wall of the sealing groove 300. A stable speed can ensure uniform contact between the grinding tool and the surface of the groove wall of the sealing groove 300, avoiding local over-grinding or under-grinding caused by speed fluctuations and making the surface roughness more consistent. Moreover, by controlling the speed, it is also possible to reduce the vibration amplitude of the niobium flange 100 and reduce the defects on the surface of the groove wall of the sealing groove 300, which is the key to ensuring the surface quality of the groove wall of the sealing groove 300.

[0094] In this embodiment, the range of the preset rotational speed is 100 r / min to 300 r / min. When the grinding tool rotates at the preset rotational speed within this range, the deburring force can be precisely controlled, avoiding dimensional deviation caused by excessive grinding, which helps to ensure the precision of the machining of the sealing groove 300. Moreover, rotating at the preset rotational speed within this range can reduce the vibration and inertia of the grinding tool, reducing the safety risks during the machining process.

[0095] Exemplarily, the preset rotational speed of the grinding tool is 200 r / min.

[0096] Optionally, the cutting tool 200 is made of cemented carbide, ceramic or diamond. On the one hand, the cutting tool 200 made of these materials has high hardness and wear resistance, can withstand the high stress and wear during the cutting process of the niobium flange 100, maintain the sharpness and cutting performance of the cutting tool 200, and extend the service life of the cutting tool 200; on the other hand, it can still maintain good hardness and cutting performance at high temperatures, is suitable for the high-temperature environment generated during the cutting process of the niobium flange 100, and reduces the cutting error caused by thermal deformation.

[0097] Optionally, the grinding tool uses back-coated sandpaper. During the cutting process, burrs and flash may be generated on the edge of the groove wall of the sealing groove 300, which not only affect the appearance of the niobium flange 100 but also may pose safety hazards during use. Using back-coated sandpaper for grinding can effectively remove these burrs and flash, making the edge of the groove wall of the sealing groove 300 smoother and neater. After cutting, the groove wall of the sealing groove 300 may have defects such as unevenness and scratches, and using back-coated sandpaper for grinding can gradually smooth these defects, making the surface of the groove wall of the sealing groove 300 flatter and improving the machining accuracy. Moreover, the back-coated design enables the sandpaper to be conveniently pasted on the processing equipment, improving the grinding efficiency and convenience.

[0098] Exemplarily, 180# back-coated sandpaper is used. 180# back-coated sandpaper belongs to medium-grit sandpaper, which is neither too rough nor too fine, and is suitable for initially flattening the surface and removing fine defects.

[0099] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A method for machining a sealing groove of a niobium flange, characterized in that, Including the following steps: S1. Install the niobium flange (100) to be processed onto the processing equipment; S2. Control the cutter (200) of the processing equipment to cut the niobium flange (100) at the position to be processed of the sealing groove (300) according to a preset method, and continuously pour coolant onto the cutter (200) during the cutting process; The preset method includes the following steps: S21. Control the cutter (200) to cut the niobium flange (100) in N segments along the width direction of the sealing groove (300), and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H; wherein, B is 1 / N of the width of the sealing groove (300), H is 1 / N of the depth of the sealing groove (300), and N is a positive integer greater than 1; S22. Repeat step S21 in the way that the number of segments decreases step by step in an arithmetic progression for N - 1 times until the sealing groove (300) is processed completely, wherein the tolerance of the number of segments is 1; S3. Use a grinding tool to grind the groove wall of the sealing groove (300).

2. The method for machining the sealing groove of the niobium flange according to claim 1, characterized in that, In step S21, the cutter (200) cuts a stepped groove on the niobium flange (100), and the stepped groove includes N groove segments; The preset method includes the following steps: S21110. Control the cutter (200) to cut the niobium flange (100) in N segments along the width direction of the sealing groove (300), and the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H; S21120. Measure the width value D1 of each groove segment, and judge whether there is a first difference between each D1 and B. If so, set the groove segment with different D1 and B as the first error segment, and sequentially execute step S22111 and step S22112. If not, directly execute step S22120; S22111. Determine the position of the first error segment, control the cutter (200) to cut the niobium flange (100) in N - 1 segments along the width direction of the sealing groove (300), the cutting width of each segment is B, and the cutting depth of each segment increases step by step in an arithmetic progression with a tolerance of H, and change the cutting width of the cutter (200) to X1 at the first error segment, and X1 is the absolute value obtained by subtracting the first difference from B; S22112. Repeat step S21110 and step S21120 in the way that the number of segments starts from N - 2 and decreases step by step in an arithmetic progression for N - 2 times until the sealing groove (300) is processed completely; S22120. Repeat step S21110 and step S21120 in the way that the number of segments decreases step by step in an arithmetic progression for N - 1 times until the sealing groove (300) is processed completely.

3. The method for machining the sealing groove of the niobium flange according to claim 1, characterized in that In step S21, the cutter (200) cuts a stepped groove on the niobium flange (100), and the stepped groove includes N groove segments; The preset method includes the following steps: S21210. Control the tool (200) to cut the niobium flange (100) in N segments along the width direction of the sealing groove (300), with the cutting width of each segment being B, and the cutting depth of each segment increasing step by step in an arithmetic progression with a common difference of H; S21220. Measure the depth value D2 of each groove segment, and determine whether there is a second difference between each D2 and H. If so, set the groove segment with D2 different from H as the second error segment, and sequentially execute step S22211 and step S22212. If not, directly execute step S22220; S22211. Determine the position of the second error segment, control the tool (200) to cut the niobium flange (100) in N - 1 segments along the width direction of the sealing groove (300), with the cutting width of each segment being B, and the cutting depth of each segment increasing step by step in an arithmetic progression with a common difference of H. And at the second error segment, change the cutting depth of the tool (200) to X2, where X2 is the absolute value obtained by subtracting the second difference from H; S22212. Repeat the execution of step S21210 and step S21220 N - 2 times in the manner of starting from N - 2 and decreasing step by step in an arithmetic progression until the sealing groove (300) is processed; S22220. Repeat the execution of step S21210 and step S21220 N - 1 times in the manner of decreasing step by step in an arithmetic progression until the sealing groove (300) is processed.

4. The method for machining the sealing groove of the niobium flange according to claim 1, wherein In step S21, after cutting each segment, control the tool (200) to move above the niobium flange (100).

5. The method for machining the sealing groove of the niobium flange according to claim 1, characterized in that, The processing equipment includes a bracket and the tool (200) detachably arranged on the bracket; Before step S1, the following steps are further included: Select the tool (200) according to the material of the niobium flange (100) and the width of the sealing groove (300). The width of the tool (200) is 0.2 mm to 2.0 mm smaller than the width of the sealing groove (300), and install the tool (200) on the bracket.

6. The method for machining the sealing groove of the niobium flange according to any one of claims 1-5, characterized in that Before step S2, the following steps are further included: Determine the feed rate, depth of cut, and cutting speed of the tool (200) according to the width and depth of the to-be-processed sealing groove (300); In step S2, control the tool (200) to cut the niobium flange (100) according to the feed rate, the depth of cut, and the cutting speed.

7. The method for machining the sealing groove of the niobium flange according to any one of claims 1-5, characterized in that, Step S3 specifically includes the following steps: Control the grinding tool to rotate at a preset speed to grind the groove wall of the sealing groove (300).

8. The method for machining the sealing groove of the niobium flange according to claim 7, characterized in that, The range of the preset speed is 100 r / min to 300 r / min.

9. The method for machining the sealing groove of the niobium flange according to any one of claims 1-5, characterized in that, The tool (200) is made of cemented carbide, ceramic, or diamond.

10. The method for machining the sealing groove of the niobium flange according to any one of claims 1-5, characterized in that, The grinding tool uses back - flocked sandpaper.

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