A rolling apparatus for a high-strength cobalt-based alloy

Abstract

The application belongs to the technical field of cobalt-based alloy processing, and particularly relates to a rolling processing equipment for high-strength cobalt-based alloy, which comprises a rack and a cooling system, the rack is provided with an upper roller and a lower roller, one end of the rack is fixedly connected with a motor one, the motor one is connected with the end of the lower roller through a speed reducer, the other end of the lower roller is installed on a bearing seat, and the rolling processing equipment further comprises a thickness acquisition module and a stress acquisition module. The thickness acquisition module and the stress acquisition module are used for monitoring the thickness of the rolled plate and rolling pressure fluctuation in real time, the corresponding fluctuation coefficients are generated through a control module, the thickness fluctuation coefficient and the stress fluctuation coefficient are comprehensively analyzed to generate an evaluation coefficient, and the evaluation result is used for dynamically adjusting the roller spacing, the rolling speed and the working state of the cooling system, so that the rolling process can be self-adapted to material characteristics and working condition changes, the thickness uniformity of the rolled plate is effectively improved, and the adverse effects caused by abnormal rolling pressure fluctuation are reduced.

Description

Technical Field

[0001] This invention relates to the field of cobalt-based alloy processing technology, and in particular to a rolling processing equipment for high-strength cobalt-based alloys. Background Technology

[0002] Cobalt-based alloys are a common type of alloy metal with many uses in daily life. In the production process, to meet their application requirements, cobalt-based alloys are typically rolled into thin plates or sheets from raw material through two sets of fixed rolls in existing rolling mills.

[0003] In the rolling process of high-strength cobalt-based alloys, due to their high strength and poor plasticity, the requirements for rolling accuracy and stability are extremely high. Traditional rolling equipment can usually only achieve basic rolling operations, and the working state of the cooling system is mostly fixed and cannot be dynamically adjusted according to the actual situation in the rolling process. This can easily lead to improper temperature control in the rolling zone, which in turn affects the rolling quality of cobalt-based alloys. These problems often result in defects such as uneven plate thickness and internal stress concentration when traditional equipment processes high-strength cobalt-based alloys, making it difficult to meet the requirements of high-quality rolling. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, this invention proposes a rolling processing equipment for high-strength cobalt-based alloys.

[0005] This invention proposes a high-strength cobalt-based alloy rolling mill, comprising a frame and a cooling system. An upper roll and a lower roll are mounted on the frame, and the distance between the upper and lower rolls is adjustable. A motor is fixedly connected to one end of the frame, and the motor is connected to the end of the lower roll via a reduction gearbox. The other end of the lower roll is mounted on a bearing housing. The cooling system is used to cool the rolling zone. The mill also includes: a thickness acquisition module for real-time monitoring of the post-rolled plate thickness and generating a thickness fluctuation coefficient via a control module; and a stress acquisition module for real-time monitoring of rolling pressure fluctuations and generating a stress fluctuation coefficient via a control module. The control module performs comprehensive analysis on the generated thickness fluctuation coefficient and stress fluctuation coefficient to generate an evaluation coefficient, which is then compared with a pre-set reference threshold. The system compares the rolling mill rolls and controls the rolling speed and cooling system based on the comparison results. High-strength cobalt-based alloy plates are rolled between upper and lower rolls. A motor drives the lower roll to rotate through a gearbox, cooperating with the upper roll to complete the rolling. The thickness acquisition module monitors the thickness of the rolled plate in real time, transmits the data to the control module and generates a thickness fluctuation coefficient. The stress acquisition module monitors the pressure fluctuation during the rolling process in real time, transmits the data to the control module and generates a stress fluctuation coefficient. The control module performs a comprehensive analysis of the thickness fluctuation coefficient and the stress fluctuation coefficient to generate an evaluation coefficient. When the evaluation coefficient exceeds a preset reference threshold, the control module adjusts the gap between the upper and lower rolls, the rolling speed, and the cooling system accordingly to ensure rolling quality.

[0006] Preferably, the frame has grooves on both sides, with sliders slidably connected within the grooves. The upper roller is rotatably connected between the two sliders. Screws, threadedly connected to the corresponding sliders, are also rotatably connected to both sides of the frame. Synchronous pulleys are fixedly fitted at the top of each screw, and the two pulleys are connected by a synchronous belt. A second motor is mounted on the top of the frame, and its output shaft is connected to the end of one of the screws. When the distance between the upper and lower rollers needs to be adjusted, the second motor starts and drives the connected screw to rotate. This screw, through the synchronous pulley and synchronous belt, drives the screw on the other side to rotate synchronously. As the two screws rotate, they drive the corresponding sliders to slide up and down within the grooves, thereby moving the upper roller up and down, thus adjusting the distance between the upper and lower rollers.

[0007] Preferably, the cooling system includes a metering pump, a nozzle, an inlet pipe, and an outlet pipe. The metering pump is fixedly connected to the top of the frame, and the inlet and outlet pipes are respectively connected to two pipe joints of the metering pump. The nozzle is connected to the bottom of the outlet pipe and faces the rolling zone. When the cooling system is working, the cooling medium enters the metering pump through the inlet pipe. After metering the cooling medium, the metering pump delivers it to the nozzle through the outlet pipe. The nozzle sprays the cooling medium onto the rolling zone to cool the upper and lower rolls and the cobalt-based alloy plate during the rolling process, thereby controlling the rolling temperature.

[0008] Preferably, the thickness acquisition module is installed on the rolling exit side, and the stress acquisition module is installed at the bottom of the bearing housing. During the rolling process, the thickness acquisition module located on the rolling exit side detects the thickness of the cobalt-based alloy plate that has just been rolled in real time to ensure that the thickness information of the rolled plate can be obtained in a timely manner. The stress acquisition module installed at the bottom of the bearing housing monitors the pressure fluctuation of the bearing housing when the roll is working in real time, thereby reflecting the change in rolling pressure. Both data are transmitted to the control module for processing.

[0009] Preferably, roller conveyor frames for conveying the plate are fixedly connected to both sides of the frame; before rolling, the high-strength cobalt-based alloy plate is conveyed to the rolling area between the upper and lower rolls through the roller conveyor frame on one side of the frame; after rolling, the rolled plate is conveyed to the next process through the roller conveyor frame on the other side of the frame. The roller conveyor frames ensure the stability and continuity of the plate conveying before and after rolling.

[0010] Preferably, the output and input terminals of the thickness acquisition module and the output and input terminals of the stress acquisition module are electrically connected to the input and output terminals of the control module, respectively, and the output terminal of the control module is electrically connected to the input terminals of motor one, motor two, and metering pump, respectively.

[0011] Preferably, the control module executes the following steps to control the working state of the rotary roll spacing, rolling speed, and cooling system based on the comparison results:

[0012] The thickness acquisition module collects the thickness of the rolled plate; the stress acquisition module collects the rolling pressure fluctuation; the control module calculates the thickness fluctuation coefficient, stress fluctuation coefficient and evaluation coefficient Rp; if Rp<0.3: maintain the current rolling force and speed; if 0.3≤Rp<0.6: increase the coolant flow rate and fine-tune the roll spacing; if Rp≥0.6: trigger speed reduction and intervene to compensate for roll parallelism.

[0013] Preferably, the generation logic of the thickness fluctuation coefficient is as follows:

[0014] The thickness acquisition module collects the thickness data of the rolled plate in real time, and generates a thickness fluctuation coefficient that characterizes the thickness uniformity based on the deviation between the actual thickness and the average thickness at each time point within time T.

[0015] Preferably, the generation logic of the stress fluctuation coefficient is as follows:

[0016] The stress acquisition module collects rolling force data in real time and generates a stress fluctuation coefficient that characterizes abnormal fluctuations in rolling force based on the fluctuation of actual rolling force and average rolling force at each time point within time T.

[0017] Preferably, the logic for generating the evaluation coefficients is as follows:

[0018] The thickness fluctuation coefficient and stress fluctuation coefficient are dynamically weighted and fused by the thickness weight coefficient and stress weight coefficient to generate the assessment coefficient of the comprehensive risk of the assessment system.

[0019] Compared with the prior art, the present invention provides a rolling processing equipment for high-strength cobalt-based alloys, which has the following beneficial effects:

[0020] 1. A rolling mill for high-strength cobalt-based alloys, which, by setting up a thickness acquisition module and a stress acquisition module, can monitor the thickness and rolling pressure fluctuations of the rolled sheet in real time, and generate corresponding fluctuation coefficients through a control module, thus achieving precise perception of key parameters in the rolling process. The control module performs comprehensive analysis on the thickness fluctuation coefficient and stress fluctuation coefficient to generate evaluation coefficients, and then dynamically adjusts the roll spacing, rolling speed and cooling system working status based on the evaluation results, so that the rolling process can adapt to changes in material properties and working conditions, effectively improving the thickness uniformity of the rolled sheet and reducing the adverse effects of abnormal rolling pressure fluctuations.

[0021] 2. A rolling processing equipment for high-strength cobalt-based alloys, wherein the dynamic adjustment of the cooling system ensures that the temperature in the rolling zone is within a reasonable range, further guaranteeing the rolling quality of high-strength cobalt-based alloys and improving production stability and product qualification rate. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first angle structure of a rolling processing equipment for high-strength cobalt-based alloys proposed in this invention;

[0023] Figure 2 This is a schematic diagram of the second angle structure of a rolling processing equipment for high-strength cobalt-based alloys proposed in this invention;

[0024] Figure 3 This is a schematic diagram of the installation structure of the stress acquisition module of a high-strength cobalt-based alloy rolling processing equipment proposed in this invention;

[0025] Figure 4 For the present invention Figure 3 A magnified structural diagram at point A;

[0026] Figure 5 This is a system block diagram of a high-strength cobalt-based alloy rolling processing equipment proposed in this invention.

[0027] In the diagram: 1. Frame; 2. Upper roll; 3. Lower roll; 4. Roller conveyor; 5. Thickness acquisition module; 6. Stress acquisition module; 7. Control module; 8. Motor 1; 9. Gearbox; 10. Slide rail; 11. Slider; 12. Screw; 13. Synchronous pulley; 14. Synchronous belt; 15. Motor 2; 16. Bearing housing; 17. Metering pump; 18. Nozzle; 19. Inlet pipe; 20. Outlet pipe. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Reference Figures 1-5 A high-strength cobalt-based alloy rolling mill includes a frame 1 and a cooling system. An upper roll 2 and a lower roll 3 are mounted on the frame 1, and the distance between the upper roll 2 and the lower roll 3 is adjustable. A motor 8 is fixedly connected to one end of the frame 1, and the motor 8 is connected to the end of the lower roll 3 via a reduction gearbox 9. The other end of the lower roll 3 is mounted on a bearing housing 16. The cooling system is used to cool the rolling zone. The mill also includes:

[0031] Thickness acquisition module 5 is used to monitor the thickness of the rolled plate in real time and generate a thickness fluctuation coefficient through control module 7;

[0032] The stress acquisition module 6 is used to monitor rolling pressure fluctuations in real time and generate stress fluctuation coefficients through the control module 7.

[0033] The control module 7 performs a comprehensive analysis of the generated thickness fluctuation coefficient and stress fluctuation coefficient to generate an evaluation coefficient. The evaluation coefficient is compared with a pre-set reference threshold, and the working status of the rotary roll spacing, rolling speed and cooling system is controlled based on the comparison results.

[0034] It should be noted that the thickness acquisition module 5 can be a laser rangefinder (KEYENCELK-H series) or other devices that can monitor the thickness of the rolled plate in real time, the stress acquisition module 6 can be a piezoelectric force sensor (Kistler9071A) or other devices that can monitor rolling pressure fluctuations in real time, and the control module 7 is an embedded controller (such as STM32 series) that integrates data fusion algorithms. Therefore, the thickness acquisition module 5, stress acquisition module 6 and control module 7 are not specifically limited here and can be selected according to actual needs.

[0035] In use, high-strength cobalt-based alloy plates are rolled between upper roll 2 and lower roll 3. Motor 8 drives the lower roll 3 to rotate through reduction gearbox 9, cooperating with the upper roll 2 to complete the rolling. Thickness acquisition module 5 monitors the thickness of the rolled plate in real time, transmits the data to control module 7 and generates a thickness fluctuation coefficient. Stress acquisition module 6 monitors the pressure fluctuation during the rolling process in real time, transmits the data to control module 7 and generates a stress fluctuation coefficient. Control module 7 performs comprehensive analysis on the thickness fluctuation coefficient and stress fluctuation coefficient to generate an evaluation coefficient. When the evaluation coefficient exceeds the preset reference threshold, control module 7 adjusts the spacing between upper roll 2 and lower roll 3, the rolling speed, and the working status of the cooling system accordingly to ensure rolling quality.

[0036] The frame 1 has sliding grooves 10 on both sides, and sliders 11 are slidably connected in the sliding grooves 10. The upper roller 2 is rotatably connected between the two sliders 11. The frame 1 also has screws 12 rotatably connected to the corresponding sliders 11. The top of the screws 12 is fixedly fitted with synchronous pulleys 13. The two synchronous pulleys 13 are connected by a synchronous belt 14. The top of the frame 1 is equipped with a second motor 15. The output shaft of the second motor 15 is connected to the end of one of the screws 12.

[0037] When it is necessary to adjust the distance between the upper roller 2 and the lower roller 3, the motor 2 15 starts and drives the screw 12 connected to it to rotate. The screw 12 drives the other screw 12 to rotate synchronously through the synchronous wheel 13 and the synchronous belt 14. When the two screws 12 rotate, they drive the corresponding slider 11 to slide up and down in the slide groove 10, thereby driving the upper roller 2 to move up and down, so as to adjust the distance between the upper roller 2 and the lower roller 3.

[0038] The cooling system includes a metering pump 17, a nozzle 18, an inlet pipe 19, and an outlet pipe 20. The metering pump 17 is fixedly connected to the top of the frame 1. The inlet pipe 19 and the outlet pipe 20 are respectively connected to two pipe joints of the metering pump 17. The nozzle 18 is connected to the bottom end of the outlet pipe 20 and faces the rolling zone.

[0039] When in use, the cooling system operates, and the cooling medium enters the metering pump 17 through the water inlet pipe 19. After metering the cooling medium, the metering pump 17 delivers it to the nozzle 18 through the water outlet pipe 20. The nozzle 18 sprays the cooling medium onto the rolling zone to cool the upper roll 2, lower roll 3, and cobalt-based alloy plate during the rolling process, thereby controlling the rolling temperature.

[0040] Among them, the thickness acquisition module 5 is installed on the rolling exit side, and the stress acquisition module 6 is installed at the bottom of the bearing housing 16;

[0041] During use, the thickness acquisition module 5 located on the rolling exit side detects the thickness of the cobalt-based alloy plate that has just been rolled in real time during the rolling process, ensuring that the thickness information of the rolled plate can be obtained in a timely manner; the stress acquisition module 6 installed at the bottom of the bearing seat 16 monitors the pressure fluctuation of the bearing seat 16 when the lower roll 3 is working in real time, thereby reflecting the change in rolling pressure. Both data are transmitted to the control module 7 for processing.

[0042] Furthermore, roller conveyor frames 4 for conveying sheet metal are fixedly connected to both sides of the frame 1;

[0043] In use, before rolling, the high-strength cobalt-based alloy sheet is conveyed to the rolling area between the upper roll 2 and the lower roll 3 via the roller conveyor 4 on one side of the frame 1; after rolling, the rolled sheet is conveyed to the next process via the roller conveyor 4 on the other side of the frame 1. The roller conveyor 4 ensures the stability and continuity of the sheet conveying before and after rolling.

[0044] The output and input terminals of the thickness acquisition module 5 and the output and input terminals of the stress acquisition module 6 are electrically connected to the input and output terminals of the control module 7, respectively. The output terminal of the control module 7 is electrically connected to the input terminal of motor 18, the input terminal of motor 25 and the input terminal of metering pump 17, respectively.

[0045] In another embodiment, the control module 7 performs a comprehensive analysis of the generated thickness fluctuation coefficient and stress fluctuation coefficient to generate an evaluation coefficient. The evaluation coefficient is then compared with a pre-set reference threshold, and the following steps are taken to control the working state of the rotary roll spacing, rolling speed, and cooling system based on the comparison results:

[0046] Real-time detection: Thickness acquisition module 5 acquires the thickness of the rolled plate; stress acquisition module 6 acquires the rolling pressure fluctuation;

[0047] Coefficient calculation:

[0048] Thickness fluctuation coefficient: Characterizes the thickness uniformity of the rolled plate, reflecting the roll gap control accuracy and material flow stability; the core correlation is the work hardening sensitivity of cobalt-based alloys (e.g., Stellite 6K hardening index ≥ 0.35), where small thickness fluctuations can amplify deformation during subsequent heat treatment;

[0049] The generation logic for the thickness fluctuation coefficient is as follows:

[0050] S1. Obtain the actual thickness of the rolled plate at different times within time T after rolling through the thickness acquisition module 5. The actual thickness obtained at the i-th time within time T is calibrated as di, i=1, 2, 3, ..., n, where i is a positive integer.

[0051] S2. Calculate the thickness fluctuation coefficient δt. The expression for the calculation is:

[0052]

[0053] In the formula, denoted as the average thickness over time T; n represents the number of samples taken over time T.

[0054] Stress fluctuation coefficient: quantifies abnormal fluctuations in rolling force, revealing abrupt changes in material deformation resistance or equipment mechanical failure; the core correlation is the low-temperature brittleness of cobalt-based alloys (elongation <15% below 800℃), and stress concentration directly leads to microcracks;

[0055] The generation logic for the stress fluctuation coefficient is as follows:

[0056] S1. The actual rolling force at different times during the plate rolling process is obtained through the stress acquisition module 6. The actual rolling force obtained at the j-th time during the T time period is calibrated as Fj, j=1, 2, 3, ..., m, where j is a positive integer.

[0057] S2. Calculate the stress fluctuation coefficient σs. The expression for the calculation is:

[0058]

[0059] In the formula, Let m be the average rolling force over time T, and m be the number of samples over time T.

[0060] Evaluation coefficient Rp: This coefficient integrates risk indicators across all dimensions, including thickness, stress, and temperature, to determine the intensity and urgency of dynamic adjustments to rolling parameters. It dynamically weights and fuses thickness and stress fluctuation coefficients using thickness and stress weighting coefficients to generate an evaluation coefficient representing the overall risk of the assessment system. This coefficient is then analyzed using a formulaic approach by control module 7, based on the following formula:

[0061]

[0062] In the formula, α and β are the thickness weighting coefficient and stress thickness weighting coefficient (e.g., α=0.7, β=0.3, the specific values ​​need to be dynamically determined in combination with experimental data and process requirements).

[0063] Dynamic adjustment: If Rp<0.3: Maintain the current rolling force and speed to stabilize production; if 0.3≤Rp<0.6: Increase the coolant flow rate by 10% and fine-tune the roll spacing by -5μm to suppress stress concentration caused by temperature; if Rp≥0.6: Trigger a 20% speed reduction to compensate for roll parallelism.

[0064] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rolling mill for high-strength cobalt-based alloys, comprising a frame (1) and a cooling system, characterized in that, The frame (1) is equipped with an upper roll (2) and a lower roll (3), and the distance between the upper roll (2) and the lower roll (3) is adjustable. One end of the frame (1) is fixedly connected to a motor (8), which is connected to the end of the lower roll (3) through a gearbox (9). The other end of the lower roll (3) is mounted on a bearing seat (16). The cooling system is used to cool the rolling zone and also includes: The thickness acquisition module (5) is used to monitor the thickness of the rolled plate in real time and generate the thickness fluctuation coefficient through the control module (7); The stress acquisition module (6) is used to monitor rolling pressure fluctuations in real time and generate stress fluctuation coefficients through the control module (7); The control module (7) performs a comprehensive analysis of the generated thickness fluctuation coefficient and stress fluctuation coefficient to generate an evaluation coefficient. The evaluation coefficient is compared with a pre-set reference threshold, and the working status of the rotary roll spacing, rolling speed and cooling system is controlled according to the comparison results. The control module (7) executes the following steps to control the working status of the rotary roll spacing, rolling speed, and cooling system based on the comparison results: Thickness acquisition module (5) acquires the thickness of the rolled plate; stress acquisition module (6) acquires the rolling pressure fluctuation; control module (7) calculates the thickness fluctuation coefficient, stress fluctuation coefficient and evaluation coefficient Rp; if Rp<0.3: maintain the current rolling force and speed, and stabilize production; if 0.3≤Rp<0.6: increase the coolant flow rate and fine-tune the roll spacing; if Rp≥0.6: trigger speed reduction and intervene to compensate for roll parallelism.

2. The rolling processing equipment for high-strength cobalt-based alloys according to claim 1, characterized in that, The frame (1) has sliding grooves (10) on both sides, and sliders (11) are slidably connected in the sliding grooves (10). The upper roller (2) is rotatably connected between the two sliders (11). The frame (1) also has screws (12) rotatably connected to the corresponding sliders (11) on both sides. The top of the screws (12) is fixedly fitted with synchronous pulleys (13). The two synchronous pulleys (13) are connected by a synchronous belt (14). The top of the frame (1) is equipped with a second motor (15). The output shaft of the second motor (15) is connected to the end of one of the screws (12).

3. The rolling processing equipment for high-strength cobalt-based alloys according to claim 2, characterized in that, The cooling system includes a metering pump (17), a nozzle (18), an inlet pipe (19), and an outlet pipe (20). The metering pump (17) is fixedly connected to the top of the frame (1). The inlet pipe (19) and the outlet pipe (20) are respectively connected to two pipe joints of the metering pump (17). The nozzle (18) is connected to the bottom end of the outlet pipe (20) and faces the rolling zone.

4. The rolling processing equipment for high-strength cobalt-based alloys according to claim 1, characterized in that, The thickness acquisition module (5) is installed on the rolling exit side, and the stress acquisition module (6) is installed at the bottom of the bearing seat (16).

5. The rolling processing equipment for high-strength cobalt-based alloys according to claim 1, characterized in that, The frame (1) is fixedly connected to two sides of roller conveyor frames (4) for conveying plates.

6. The rolling processing equipment for high-strength cobalt-based alloys according to claim 3, characterized in that, The output and input ends of the thickness acquisition module (5) and the output and input ends of the stress acquisition module (6) are electrically connected to the input and output ends of the control module (7), respectively. The output end of the control module (7) is electrically connected to the input end of motor one (8), the input end of motor two (15) and the input end of metering pump (17), respectively.

7. The rolling processing equipment for high-strength cobalt-based alloys according to claim 1, characterized in that, The generation logic of the thickness fluctuation coefficient is as follows: The thickness acquisition module (5) collects the thickness data of the rolled plate in real time, and generates a thickness fluctuation coefficient that characterizes the thickness uniformity based on the deviation between the actual thickness and the average thickness at each time within time T.

8. The rolling processing equipment for high-strength cobalt-based alloys according to claim 1, characterized in that, The generation logic of the stress fluctuation coefficient is as follows: The stress acquisition module (6) collects rolling force data in real time and generates a stress fluctuation coefficient that characterizes abnormal fluctuations in rolling force based on the fluctuation degree of actual rolling force and average rolling force at each time within time T.

9. The rolling processing equipment for high-strength cobalt-based alloys according to claim 1, characterized in that, The logic for generating the evaluation coefficients is as follows: The thickness fluctuation coefficient and stress fluctuation coefficient are dynamically weighted and fused by the thickness weight coefficient and stress weight coefficient to generate the assessment coefficient of the comprehensive risk of the assessment system.

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