Sendzimir type twenty-high roll mill memorial archway plum blossom cavity machining tool

Abstract

The invention relates to the technical field of machining tools, and discloses a machining tool for a quincuncial cavity of a Sendzimir twenty-high roll mill housing, which can control the dimensional tolerance within an extremely small range by ensuring that the dimensional precision of the quincuncial cavity reaches a higher level, so that the matching between the mill housing and a roll system is tighter and more accurate, and the service life of the quincuncial cavity is prolonged. The problems of unstable equipment operation, uneven roll system abrasion and the like caused by dimensional deviation can be effectively reduced, and the rolling quality of a rolling mill and the dimensional accuracy of products are improved; the shape and position precision, such as flatness, perpendicularity, parallelism and the like, of the plum blossom cavity can be better ensured; due to the high-precision shape and position precision, the rollers can be more accurately mounted in the memorial archway, and the mutual position relation among the rollers is ensured to be accurate, so that the pressure among the rollers is uniformly distributed in the rolling process, the service life of the rollers is prolonged, and the strip shape quality of a strip is favorably improved; the high-precision machining tool can improve the machining precision, and material scrapping and waste caused by machining errors are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of processing tooling, in particular to a Sendzimir type twenty-roller rolling mill arch plum blossom cavity processing tooling. Background Art

[0002] Urgent demand for high-precision cold rolling equipment manufacturing: Sendzimir type twenty-high mill is used for cold rolling of materials with higher hardness, such as thin plates and ultra-thin strips of silicon steel and stainless steel. With the continuous improvement of the quality requirements of cold-rolled strips in modern industry, it is necessary to obtain very precise thickness deviations in the entire width direction of rolling, which makes the high-precision processing of the mill arch plum blossom cavity the key to ensure smooth rolling.

[0003] Traditional plum blossom cavity processing mainly relies on vertical boring machines, but the structural characteristics of the vertical boring machine and the long extension length of the spindle during processing make the gravity have a greater impact on the spindle, resulting in deflection deformation; in addition, the arch itself is heavy, and it is difficult for the boring machine worktable to ensure movement accuracy when carrying such a heavy workpiece; using a boring machine to process plum blossom cavities cannot meet the accuracy requirements of high-precision rolling mills for plum blossom cavities.

[0004] Therefore, it is urgent to invent a Sendzimir type twenty-roller rolling mill arch plum blossom cavity processing tooling to solve the above problems by improving processing accuracy, efficiency and stability. Summary of the invention

[0005] Technical issues solved

[0006] In view of the deficiencies in the prior art, the present invention provides a Sendzimir type twenty-roller rolling mill arch plum blossom cavity processing tooling.

[0007] Technical Solution

[0008] To achieve the above-mentioned solution, the present invention provides the following technical solutions: a Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling, comprising an archway, the archway is installed with a wall panel, the wall panel is provided with a centrally symmetrically distributed plum blossom cavity, a bearing seat is connected in the plum blossom cavity, the bearing seat and the plum blossom cavity are connected by a locating pin and bolted fastening, the mating surface is cleaned and checked before installing the bearing seat, heating or cooling methods are used to assist installation, the bearing seat is connected to a boring bar, and the boring bar and the bearing seat are connected by a rolling bearing.

[0009] Furthermore, when the boring bar is connected to the bearing seat, a special alignment tool is used to adjust the concentricity so that the concentricity error does not exceed 0.01 mm, and the bearing clearance or preload is adjusted to control the axial movement of the boring bar within 0.005 mm and the radial runout within 0.003 mm.

[0010] An operating method for a Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tool, the method is applied to the Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tool, the method comprises the following steps:

[0011] S1: Installation and commissioning of tooling: Install and commission the boring machine, lift the processing tooling to the designated position of the boring machine, connect it with high-strength bolts, tighten it with a torque wrench to the specified torque, and control the horizontality error within ±0.005mm by adjusting the wedge iron and shim at the bottom of the tooling.

[0012] S2: Arch positioning: Use the crane to steadily lift the mill arch blank to the top of the fixture, so that the arch positioning reference is aligned with the positioning surface of the fixture positioning device, and use the adjustable positioning block on the fixture positioning device in conjunction with a laser rangefinder or electronic caliper to position the arch.

[0013] S3: Tool selection and installation: For the Sendzimir type twenty-high rolling mill arch plum blossom cavity, select a carbide milling cutter, clean the tool chuck before installing the tool, tighten it with a special locking nut according to the specified torque after inserting the tool, and use a high-precision dynamic balancing instrument to detect and adjust the tool.

[0014] S4: Process control: Turn on the processing equipment, set the initial cutting speed to 120m / min, the feed rate to 0.08mm / r, and the cutting depth to 0.5mm. During the processing, measure the processing allowance every 5mm depth.

[0015] S5: Post-processing inspection and adjustment: After completing the rough and fine processing of the plum blossom cavity, remove the fixture and use a three-coordinate measuring machine with an accuracy of ±0.001mm to measure the key dimensions. When the inner diameter of a plum blossom cavity is 0.003mm larger than the design dimension, use the fine-tuning mechanism of the fixture to fine-tune the corresponding tool chuck radially inward by 0.002mm, and inspect again until the inner diameter dimension error is controlled within ±0.002mm.

[0016] Furthermore, in step S1, the torque error is ensured to be within ±5%, and the levelness of the tooling is measured using a micrometer with an accuracy of 0.001 mm.

[0017] Furthermore, in step S2, the relative position deviation between the processing part of the archway plum blossom cavity and the tooling tool is within ±0.05mm. After the positioning is completed, the front and rear hole positions of the archway wallboard are measured using a three-coordinate measuring instrument, and the positioning device is fine-tuned to control the position error of the front and rear holes within ±0.01mm.

[0018] Furthermore, in step S3, the material of the plum blossom cavity is high-quality alloy steel, the depth is 150 mm, the minimum inner diameter is 80 mm, the design size tolerance is ±0.002 mm, the tool diameter is 79.996 mm, the blade length is 180 mm, and the radial runout error is controlled within ±0.001 mm.

[0019] Furthermore, in step S4, a caliper with an accuracy of 0.01 mm is used to measure the machining allowance. When the machining allowance exceeds 0.5 mm, the cutting speed is increased to 130 m / min, and the feed rate remains unchanged. When the machining allowance is less than 0.3 mm, the cutting speed is reduced to 110 m / min, and the cutting depth is reduced to 0.3 mm to ensure that the machining surface roughness reaches Ra0.8 μm.

[0020] Furthermore, in step S5, the key dimensions include but are not limited to the inner diameter of the plum blossom cavity, the parallelism of the cavity wall, and the position accuracy between the cavities.

[0021] Furthermore, when fine-tuning is performed in step S5, local supplementary processing is performed using parameters of a cutting speed of 100 m / min and a feed rate of 0.05 mm / r.

[0022] Beneficial Effects

[0023] Compared with the prior art, the present invention provides a Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling, which has the following beneficial effects:

[0024] 1. The Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling can control the dimensional tolerance within a very small range by ensuring that the dimensional accuracy of the plum blossom cavity reaches a high level, making the cooperation between the mill arch and the roller system more tight and accurate, and can effectively reduce the problems of unstable equipment operation and uneven wear of the roller system caused by dimensional deviation, improve the rolling quality of the rolling mill and the dimensional accuracy of the product; it can better ensure the shape and position accuracy of the plum blossom cavity, such as flatness, verticality, parallelism, etc.

[0025] 2. The Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling, high-precision processing tooling can improve processing accuracy, reduce material scrap and waste caused by processing errors, at the same time, the use of tooling can also optimize the processing technology, improve material utilization and reduce production costs.

[0026] 3. The Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling has high-precision shape and position accuracy, which can make the installation of the rollers in the arch more accurate and ensure the accurate relative position relationship between the rollers, so that the pressure between the rollers is evenly distributed during the rolling process, which increases the service life of the rollers and is beneficial to improving the plate quality of the strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall installation structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the bearing seat wall plate boring bar installation structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the archway wall panel structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the front structure of the bearing seat of the present invention;

[0031] Figure 5 It is a schematic diagram of the side structure of the bearing seat of the present invention;

[0032] Figure 6 It is a schematic diagram of the operation flow of the present invention.

[0033] In the figure: 10, archway; 11, wall panel; 12, plum blossom cavity; 13, bearing seat; 14, boring bar. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0035] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the descriptions with reference to the terms "one scheme", "some schemes", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more schemes or examples.

[0039] See also Figure 1 to Figure 6 The present invention proposes a Sendzimir type twenty-roll mill arch plum blossom cavity processing tooling. When using it, first of all, the selected work site must be clean, flat and have sufficient load-bearing capacity. Avoid impurities from mixing into the connection between the tooling and the boring machine to ensure the tightness and stability of the connection. Install and debug the boring machine to normal working state. When installing the boring machine, the horizontality and verticality of the boring machine must be accurately adjusted according to the installation manual of the boring machine to ensure that the various precision indicators of the boring machine meet the factory requirements of the equipment. During the debugging process, the spindle speed, feed system, cooling system and other key components of the boring machine are inspected and tested to ensure their normal operation. For example, by detecting the radial runout and axial movement of the spindle, they are controlled within the allowable small range. Generally, the radial runout does not exceed 0.002mm, and the axial movement does not exceed 0.003mm, so as to ensure the accuracy foundation of subsequent processing.

[0040] Lift the processing tooling to the designated installation position of the boring machine, and use high-strength bolts to connect the tooling to the boring machine. The selection of high-strength bolts is determined according to the connection strength requirements of the tooling and the boring machine. They have high tensile strength and shear strength, which can ensure that the tooling can withstand large cutting forces without loosening during the processing. When tightening the bolts, use a torque wrench to operate according to the specified torque to ensure that the tightening degree of each bolt is consistent. Generally, the torque error is controlled within ±5%. For example, for M20 high-strength bolts, the specified torque is 200N·m, and the torque should be between 190-210N·m during actual operation.

[0041] Use a micrometer with an accuracy of 0.001mm to measure the levelness of multiple key parts of the tooling. Select the four corners or other symmetrical positions of the tooling as measuring points, and change the levelness of the tooling by adjusting the shims at the bottom of the tooling. The shims generally adopt an adjustable wedge structure, and the height of the tooling is adjusted by rotating or moving the wedge to adjust the levelness. During the adjustment process, repeated measurements and adjustments are performed to control the levelness error of the tooling within ±0.005mm. This is because the levelness of the tooling directly affects the relative position accuracy of the tool and the arch 10 during the processing process. If the levelness error is too large, it will cause the processed plum blossom cavity 12 to have problems such as tilt and dimensional deviation.

[0042] Use the crane to lift the blank of the rolling mill arch 10 to the top of the fixture. During the lifting process, ensure that the crane runs smoothly to avoid shaking and collision of the arch 10. The crane operator must strictly follow the operating procedures, control the lifting speed and height, and arrange special personnel to command to ensure the safety of the lifting process.

[0043] Slowly lower the archway 10 so that the positioning reference of the archway 10 fits with the positioning surface of the tooling positioning device. The positioning reference of the archway 10 is usually a pre-designed processing reference surface, such as a plane, a hole, etc., and the positioning surface of the tooling positioning device precisely matches it. During the fitting process, pay attention to the position of the archway 10 to ensure that the positioning reference is in full contact with the positioning surface. If there is a gap, the position of the archway 10 needs to be readjusted.

[0044] The arch 10 is accurately positioned in the three directions of X, Y, and Z through the adjustable positioning block on the tooling positioning device. The adjustable positioning block generally adopts a screw nut structure or a wedge block structure, and the position adjustment of the positioning block is achieved by rotating the screw or moving the wedge block. During the adjustment process, a high-precision measuring tool, such as a laser rangefinder or an electronic caliper, is used to measure the position deviation of the arch 10 in real time to ensure that the relative position deviation between the processing part of the arch 10 plum blossom cavity 12 and the tooling tool is within ±0.05mm.

[0045] After the positioning is completed, the three-coordinate measuring instrument is used again to measure the positions of the front and rear holes of the arch 10 wall panel 11. The three-coordinate measuring instrument accurately measures the geometric dimensions and positional relationships of an object by moving the detection head in the three coordinate directions of space. The detection head of the measuring instrument is respectively contacted with the inner walls of the front and rear holes of the arch 10 wall panel 11 to obtain the center coordinates of the holes, and the front and rear holes are judged by calculating the difference in the center coordinates to determine whether they are in the same horizontal position. If the position deviation exceeds the allowable range, fine-tune the positioning device. For example, when it is found that the center of the front hole is 0.02mm higher than the center of the rear hole, the corresponding part of the arch 10 is lowered by 0.02mm by adjusting the vertical adjustment mechanism on the positioning device until the front and rear holes of the arch 10 wall panel 11 are in the same horizontal position, and the error is controlled within ±0.01mm. In this way, the machining accuracy of the tool on the plum blossom cavity 12 can be guaranteed during the machining process, and the accumulation of machining errors can be avoided.

[0046] The wall panels 11 of the archway 10 are provided with plum blossom cavities 12 that are symmetrically distributed in the center. This design ensures the force balance of the rolling mill during operation. A bearing seat 13 is connected to the plum blossom cavity 12, and the bearing seat 13 is connected to the plum blossom cavity 12 by means of locating pins and bolt fastening. The locating pins are used to accurately determine the position of the bearing seat 13, and then the reliability of the connection is further enhanced by bolt fastening. When installing the bearing seat 13, first clean and inspect the matching surfaces of the plum blossom cavity 12 and the bearing seat 13 to ensure that the surface is free of impurities and damage. Then, use heating or cooling methods to make the matching of the bearing seat 13 and the plum blossom cavity 12 smoother.

[0047] The bearing seat 13 is connected to a boring bar 14, and the boring bar 14 and the bearing seat 13 are connected by a high-precision sliding bearing or rolling bearing. Sliding bearings have good vibration absorption and smooth movement, while rolling bearings have high rotation accuracy and low friction coefficient. When connecting the boring bar 14, ensure the concentricity of the boring bar 14 and the bearing seat 13, and use a special centering tool to adjust it to ensure that the concentricity error is within a very small range, generally not exceeding 0.01mm. At the same time, check the axial movement and radial runout of the boring bar 14, and control the axial movement within 0.005mm and the radial runout within 0.003mm by adjusting the clearance or preload of the bearing. During the processing, the boring bar 14 acts as a carrier of the tool, and its accuracy directly affects the processing accuracy. Therefore, the connection between the boring bar 14 and the bearing seat 13 should be regularly inspected and maintained to ensure the reliability and accuracy of the connection.

[0048] For the Sendzimir type twenty-high rolling mill arch 10 plum blossom cavity 12, its material is high-quality alloy steel, which has high strength and hardness and is difficult to process. The plum blossom cavity 12 has a depth of 150mm and a minimum inner diameter of 80mm. The design dimensional tolerance is required to be controlled within ±0.002mm, which places high demands on the cutting performance and dimensional accuracy of the tool.

[0049] According to these parameters, carbide milling cutters are selected. Carbide milling cutters have high hardness, high wear resistance and good heat resistance, and can meet the needs of processing high-quality alloy steel. The tool diameter is 79.996mm, which is slightly smaller than the minimum inner diameter of the plum blossom cavity 12, to ensure that the tool can smoothly enter the plum blossom cavity 12 and cut during the processing, and reserve a certain amount of processing allowance for subsequent finishing. The blade length is 180mm, which is 30mm longer than the depth of the plum blossom cavity 12. This is to ensure that the tool has sufficient cutting length during the processing, and to avoid the tool affecting the processing effect due to insufficient length during the cutting process.

[0050] When installing the tool, first clean the tool chuck and use a special cleaner and brush to remove oil stains, iron filings and other impurities on the chuck. Oil stains will affect the tightness of the connection between the tool and the chuck, and iron filings may cause the tool to be installed eccentrically, affecting the processing accuracy.

[0051] Then insert the tool into the tool chuck and tighten it with a special locking nut according to the specified torque. The specified torque is determined according to the specifications of the tool chuck and the tool, and is generally clearly marked in the product manual of the tool and chuck. For example, for this carbide milling cutter and matching chuck, the specified torque is 150N·m. During the tightening process, use a torque wrench to ensure accurate torque and ensure that the tool is firmly installed. At the same time, use a high-precision dynamic balancing instrument to perform dynamic balancing detection on the installed tool, adjust the position of the tool, and control the radial runout error of the tool within ±0.001mm. The radial runout of the tool will directly affect the roughness and dimensional accuracy of the machined surface. If the radial runout is too large, the inner wall of the processed plum blossom cavity 12 will appear corrugated and the size will also deviate.

[0052] Turn on the processing equipment, set the initial cutting speed to 120m / min, the feed rate to 0.08mm / r, and the cutting depth to 0.5mm. The setting of these parameters is determined by comprehensively considering the material of the arch 10, the performance of the tool and the processing requirements. For high-quality alloy steel materials, the cutting speed should not be too high, otherwise the tool will easily wear too quickly; the feed rate and cutting depth also need to be reasonably selected according to the strength of the tool and the processing accuracy requirements. Lower feed rates and cutting depths can ensure processing accuracy, but will affect processing efficiency, so it is necessary to find a balance between the two.

[0053] During the machining process, the machining status is monitored in real time, and the machining allowance is measured every 5mm machining depth. Use a caliper with an accuracy of 0.01mm or other measuring tools to measure the distance between the machined surface and the unmachined surface to obtain the machining allowance. If the machining allowance exceeds 0.5mm, it means that the current cutting parameters can be appropriately increased to speed up the machining speed. Therefore, the cutting speed is appropriately increased to 130m / min, and the feed rate remains unchanged. This is because within the range allowed by the tool and workpiece material, increasing the cutting speed can increase the amount of metal removed per unit time, but care should be taken to avoid excessively high cutting speeds that lead to increased tool wear or reduced workpiece surface quality.

[0054] If the machining allowance is less than 0.3mm, it means that the current cutting parameters may be too large, and the cutting speed and cutting depth need to be reduced to ensure machining accuracy. At this time, the cutting speed is reduced to 110m / min, and the cutting depth is reduced to 0.3mm. In this way, the machining accuracy and surface quality are ensured, and the machining surface roughness reaches Ra0.8μm. This surface roughness can meet the use requirements of the Sendzimir type twenty-roll mill arch 10 plum blossom cavity 12, ensure the good cooperation between the roller and the plum blossom cavity 12, and reduce friction and wear.

[0055] After the rough machining and fine machining of the plum blossom cavity 12 are completed, the fixture is removed from the rolling mill arch 10. The key dimensions of the plum blossom cavity 12, such as the inner diameter, cavity wall parallelism, and position accuracy between cavities, are measured using a three-coordinate measuring instrument with an accuracy of ±0.001 mm.

[0056] When measuring the inner diameter, the probe head of the three-dimensional coordinate measuring machine is measured along the circumferential direction of the inner wall of the plum blossom cavity 12, and the data of multiple measurement points are obtained. The inner diameter size is obtained by calculating the average value of these points. When measuring the parallelism of the cavity wall, multiple points are measured at different heights and positions of the cavity wall, and the parallelism of the cavity wall is judged by comparing the distance deviation between these points. For the position accuracy between each cavity, the relative position relationship between different plum blossom cavities 12 is measured, such as center distance, angle deviation, etc.

[0057] If it is detected that the inner diameter of a certain plum blossom cavity 12 is 0.003mm larger than the design size, the fine-tuning mechanism of the tooling is used to fine-tune the corresponding tool chuck radially inward by 0.002mm. The fine-tuning mechanism of the tooling generally adopts a high-precision screw nut or elastic deformation mechanism to achieve a small displacement of the tool chuck by precise rotation or adjustment. Then the plum blossom cavity 12 is partially re-processed. During the re-processing process, a lower cutting speed and feed rate are used, such as a cutting speed of 100m / min and a feed rate of 0.05mm / r, to ensure the accuracy of the re-processing. Detect again until the inner diameter size error is controlled within ±0.002mm. Through this post-processing detection and adjustment method, it is ensured that the processing accuracy of the plum blossom cavity 12 meets the design requirements and improves the quality and reliability of the product.

[0058] The operating principle of this tooling mainly revolves around improving processing accuracy, efficiency and stability. In the tooling installation stage, precise site preparation, boring machine debugging and tooling level adjustment are used to provide a stable basic platform for subsequent processing. In the positioning operation of the arch 10, the positioning device and the three-coordinate measuring instrument are used to achieve high-precision positioning of the arch 10 to ensure the accurate relative position of the processing part and the tool. Tool selection and installation are optimized according to processing requirements and tool performance to ensure the cutting performance and installation accuracy of the tool. Processing process parameter control monitors the processing allowance in real time, dynamically adjusts the cutting parameters, and balances processing accuracy and efficiency. Post-processing inspection and adjustment use high-precision measuring instruments and fine-tuning mechanisms to correct processing errors and ensure the quality of the final product.

[0059] Through the above precise operation process, the tooling can stably control the dimensional tolerance of the plum blossom cavity 12 within the range of ±0.002mm. This makes the cooperation between the mill arch 10 and the roller system more tight and accurate, reducing the problem of unstable equipment operation caused by dimensional deviation.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tool, comprising an arch (10), characterized in that: The memorial archway (10) is installed with a wall panel (11), and the wall panel (11) is provided with a plum blossom cavity (12) distributed in a central symmetrical manner. A bearing seat (13) is connected in the plum blossom cavity (12). The bearing seat (13) and the plum blossom cavity (12) are connected by means of a positioning pin and bolt fastening. Before installing the bearing seat (13), the matching surface is cleaned and checked, and a heating or cooling method is used to assist the installation. The bearing seat (13) is connected to a boring rod (14), and the boring rod (14) and the bearing seat (13) are connected by a rolling bearing.

2. The Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling according to claim 1, characterized in that: When the boring bar (14) is connected to the bearing seat (13), a special centering tool is used to adjust the concentricity so that the concentricity error does not exceed 0.01 mm, and the bearing clearance or preload is adjusted to control the axial movement of the boring bar (14) within 0.005 mm and the radial runout within 0.003 mm.

3. An operating method for a Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling, characterized in that: The method is applied to a Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tool as described in any one of claims 1-2 above, and the method comprises the following steps: S1: Installation and commissioning of tooling: Install and commission the boring machine, hoist the processing tooling to the designated position of the boring machine, connect it with high-strength bolts, tighten it with a torque wrench according to the specified torque, and control the horizontality error within ±0.005mm by adjusting the wedge iron and shim at the bottom of the tooling; S2: Positioning: Use a crane to stably lift the blank of the rolling mill arch (10) to the top of the fixture, so that the positioning reference of the arch 10 is aligned with the positioning surface of the fixture positioning device, and the arch (10) is positioned by using an adjustable positioning block on the fixture positioning device in conjunction with a laser rangefinder or an electronic caliper; S3: Tool selection and installation: Select carbide milling cutter, clean the tool chuck before installing the tool, tighten the tool with a special locking nut according to the specified torque after inserting the tool, and use a high-precision dynamic balancer to detect and adjust the tool; S4: Process control: Turn on the processing equipment, set the initial cutting speed to 120m / min, the feed rate to 0.08mm / r, the cutting depth to 0.5mm, and measure the machining allowance every 5mm depth during the processing; S5: Post-processing inspection and adjustment: After the processing of the plum blossom cavity (12) is completed, the fixture is removed and the key dimensions are measured using a three-dimensional coordinate measuring machine with an accuracy of ±0.001mm. When the inner diameter of a plum blossom cavity (12) is 0.003mm larger than the designed dimension, the corresponding tool chuck is fine-tuned radially inward by 0.002mm using the fine-tuning mechanism of the fixture, and the inspection is repeated until the inner diameter dimension error is controlled within ±0.002mm.

4. The method for operating the Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling according to claim 3 is characterized in that: In step S1, the torque error is ensured to be within ±5%, and the levelness of the tooling is measured using a micrometer with an accuracy of 0.001 mm.

5. The method for operating the Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling according to claim 3, characterized in that: In step S2, the relative position deviation between the processing part of the plum blossom cavity (12) and the tooling tool is within ±0.05 mm. After the positioning is completed, a three-coordinate measuring instrument is used to measure the front and rear hole positions of the archway (10) wallboard (11), and the positioning device is fine-tuned to control the front and rear hole position error within ±0.01 mm.

6. The method for operating the Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling according to claim 3, characterized in that: In step S3, the material of the plum blossom cavity (12) is high-quality alloy steel, with a depth of 150 mm, a minimum inner diameter of 80 mm, a design size tolerance of ±0.002 mm, a tool diameter of 79.996 mm, a blade length of 180 mm, and a radial runout error controlled within ±0.001 mm.

7. The method for operating the Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling according to claim 3, characterized in that: In step S4, a caliper with an accuracy of 0.01 mm is used to measure the machining allowance. When the machining allowance exceeds 0.5 mm, the cutting speed is increased to 130 m / min, and the feed rate remains unchanged. When the machining allowance is less than 0.3 mm, the cutting speed is reduced to 110 m / min, and the cutting depth is reduced to 0.3 mm to ensure that the machining surface roughness reaches Ra0.8 μm.

8. The method for operating the Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling according to claim 3, characterized in that: In step S5, the key dimensions include but are not limited to the inner diameter of the plum blossom cavity 12, the parallelism of the cavity wall, and the position accuracy between the cavities.

9. The method for operating the Sendzimir type twenty-high rolling mill arch plum blossom cavity processing tooling according to claim 3, characterized in that: When fine-tuning is performed in step S5, local supplementary processing is performed using parameters of a cutting speed of 100 m / min and a feed rate of 0.05 mm / r.

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