Stainless steel plate rolling type gas quenching method and system and application of stainless steel plate rolling type gas quenching method and system

Abstract

The invention provides a stainless steel plate rolling type gas quenching method and system and application of the stainless steel plate rolling type gas quenching method. The stainless steel plate rolling type gas quenching method comprises the following steps that S1, a heated stainless steel plate is output from a heat treatment furnace and enters a rolling type gas quenching device; s2, vertically symmetrical rolling assemblies and multiple sets of air blowing openings are arranged in the rolling type air quenching device; s3, the stainless steel plate is continuously rolled by adjusting the gap of the rolling assembly, and uniform pressure is applied; s4, array type high-pressure air blowing is conducted through multiple sets of air blowing openings; the step S3 and the step S4 are carried out cooperatively. According to the method, rapid and uniform cooling can be achieved, deformation can be corrected in real time, the problems of oxidation, cracks and non-uniformity caused by traditional water quenching or air cooling are avoided, meanwhile, the cooling rate is increased by 2-3 times, and the temperature gradient is controlled within 5 DEG C / cm.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology, and in particular to a roll-pressed gas quenching method, system and application of stainless steel plates. Background Technology

[0002] Stainless steel sheets are widely used in cutting tools, kitchenware, architectural decoration, and medical devices due to their excellent corrosion resistance, high strength, and good machinability. However, in the heat treatment process of stainless steel sheets, the quenching and cooling stage is a critical step affecting material properties and product quality. Traditional quenching and cooling methods mainly include water quenching, oil quenching, and simple air cooling, but these methods have significant shortcomings when processing stainless steel sheets.

[0003] While water quenching offers rapid cooling and quickly lowers the temperature of sheet metal, the high thermal sensitivity of stainless steel often leads to surface oxidation, microcracks, or stress concentration, severely impacting surface quality and mechanical properties. Furthermore, uneven cooling in water quenching can cause warping or twisting, especially in thin sheets (0.5-3mm thick), reducing subsequent processing accuracy and product yield. Oil quenching, while reducing surface oxidation, is slower and presents environmental concerns and higher operating costs, making it unsuitable for large-scale continuous production. Traditional air cooling is also slow and often fails to meet the rapid quenching requirements of high-strength stainless steels (such as martensitic stainless steel), resulting in incomplete phase transformation and unsatisfactory mechanical properties (such as hardness and toughness). Additionally, traditional air cooling equipment typically uses single or limited air vents, leading to poor cooling uniformity. Sheets are susceptible to thermal stress during cooling, causing bending or twisting and affecting product quality.

[0004] In recent years, with the increasing demand for high precision and high quality in stainless steel products, heat treatment production lines have gradually developed towards continuous and integrated operations. While some existing continuous heat treatment production lines have achieved a certain degree of automation and continuous production with air quenching technology, they lack sufficient optimization for the specific properties of stainless steel sheets (such as high corrosion resistance and thermal sensitivity). Existing air quenching devices have simple air nozzle designs and low cooling rates (typically below 20-30℃ / s), making it difficult to achieve rapid and uniform cooling. Simultaneously, the lack of effective means to control sheet deformation leads to micro-deformation during cooling, affecting flatness and subsequent processing accuracy. Furthermore, existing equipment lacks flexibility when processing stainless steel sheets of different thicknesses and widths, making it difficult to meet diverse production needs.

[0005] Therefore, given the special requirements of heat treatment for stainless steel sheets, there is an urgent need for an efficient quenching method that can achieve rapid and uniform cooling while effectively controlling sheet deformation, in order to improve the mechanical properties, surface quality, and production efficiency of stainless steel sheets and meet the demand for high-quality stainless steel products in fields such as knives, kitchenware, and construction. Summary of the Invention

[0006] In view of this, the present invention provides a method, system and application of roll forming air quenching for stainless steel plates. Through the synergistic effect of the roll forming component and the multi-air nozzle array, rapid and uniform cooling and real-time deformation correction are achieved, avoiding oxidation, cracking and unevenness caused by traditional water quenching or air cooling. At the same time, the cooling rate is increased by 2-3 times and the temperature gradient is controlled within 5℃ / cm.

[0007] On one hand, the present invention provides a roll-pressing gas quenching method for stainless steel sheets, wherein the roll-pressing gas quenching method for stainless steel sheets includes the following steps: S1: The heated stainless steel sheet is output from the heat treatment furnace and enters the roller-type gas quenching device. S2: The roller pressing device is equipped with symmetrical roller pressing components and multiple sets of air blowing ports. S3: By adjusting the gap of the roller pressing assembly, the stainless steel sheet is continuously rolled to apply uniform pressure; S4: High-pressure air is blown in through an array of multiple air nozzles; S3 and S4 are performed in concert.

[0008] In addition to the aspects described above and any possible implementation, a further implementation is provided in which the pressure applied during the continuous rolling process in S3 is 0.5-2 MPa.

[0009] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the gap of the rolling assembly in S3 is adjusted according to the thickness of the sheet material, and the flatness error of the stainless steel sheet after rolling is less than 1 mm / m.

[0010] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the array-type high-pressure air blowing in S4 specifically involves: setting 4-6 air outlets on each of the upper and lower sides, with the angle of the air outlets adjusted to be 45°-60° for tilted blowing.

[0011] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the high-pressure air blown in S4 is at room temperature or low temperature, and the blown high-pressure air is also supplemented with atomized water vapor. The wind speed of the blown high-pressure air is controlled at 20-50 m / s, and the cooling rate reaches 50-100℃ / s.

[0012] In addition to the aspects and any possible implementations described above, a further implementation is provided in which, after setting multiple sets of air outlets in S2, a temperature sensor is also set to monitor the temperature gradient in real time, ensuring that the temperature gradient of each part of the stainless steel plate is less than 5℃ / cm.

[0013] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the thickness of the stainless steel sheet in S1 is 0.5-3 mm, and the stainless steel sheet is martensitic stainless steel.

[0014] As described above and in any possible implementation, a stainless steel sheet roll forming gas quenching system is further provided for the stainless steel sheet roll forming gas quenching method, the stainless steel sheet roll forming gas quenching system comprising: upper and lower symmetrically arranged roll forming components and multiple sets of air outlets: The roller pressing assembly adopts an adjustable gap roller system. The roller is made of high temperature resistant alloy with a surface roughness Ra≤0.8μm. The gap is automatically adjusted according to the thickness of the plate, with an adjustment range of 0.5-3mm. The plate is continuously rolled and pressed, and a uniform pressure of 0.5-2MPa is applied. The multiple sets of air outlets are arranged in an array, with 4-6 independently controllable air outlets on each of the upper and lower sides. The outlet area of ​​each air outlet is 5-15 cm². 2 The overlap rate of the airflow coverage area of ​​adjacent air outlets shall not be less than 30%.

[0015] In addition to the aspects and any possible implementations described above, a further implementation is provided in which each of the multiple sets of air outlets is equipped with a high-pressure blower and a temperature sensor, wherein the air pressure of the high-pressure blower is ≥0.8MPa, the detection accuracy of the temperature sensor is ±0.5℃, and the response time is ≤0.1s.

[0016] In accordance with the aspects described above and any possible implementation, an application of the stainless steel sheet roll-pressing gas quenching method is further provided for the production of stainless steel products in the fields of knives, kitchenware, or construction by the stainless steel sheet roll-pressing gas quenching method.

[0017] Compared with the prior art, the present invention can achieve the following technical effects: 1. Specifically optimized for stainless steel sheets, targeting their high corrosion resistance and heat sensitivity, the cooling rate reaches 50-100℃ / s, which is 2-3 times higher than traditional air cooling; 2. The combined effect of roll forming and air quenching suppresses deformation from a mechanical perspective, and with precise temperature control, it achieves a dual guarantee of cooling uniformity and plate flatness. 3. Multiple air outlets are independently controllable and can be adjusted based on temperature sensor feedback to adapt to the cooling needs of plates with different thicknesses (0.5-3mm) and widths (200-600mm), offering high flexibility; 4. Using air as the main cooling medium, the energy consumption per unit mass of sheet material is ≤0.8kWh / kg, which is energy-saving and environmentally friendly. No complicated equipment modification is required, and it can be directly connected to a continuous production line.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural diagram of a stainless steel sheet roll-pressed gas quenching system according to an embodiment of the present invention; Figure 2 This is a flowchart of a roll-pressed gas quenching method for stainless steel plates provided in one embodiment of the present invention. Detailed Implementation

[0021] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0024] like Figure 2 As shown, this embodiment of the invention provides a roll-pressing air quenching method for stainless steel sheets. This method achieves rapid and uniform cooling of the stainless steel sheet through the synergistic effect of the roll pressing assembly and multiple sets of air nozzles, while ensuring the flatness and shape stability of the sheet during the cooling process.

[0025] Step S1: The heated stainless steel sheet is output from the heat treatment furnace and enters the roller-type gas quenching device.

[0026] In one embodiment, the stainless steel sheet undergoes solution treatment in a heat treatment furnace, typically at temperatures between 1050 and 1150 degrees Celsius. Upon exiting the heat treatment furnace, the sheet undergoes a smooth transition via a specially designed conveyor roller system. This system is constructed of a high-temperature resistant alloy material with a specially treated surface to reduce adhesion to the high-temperature sheet. The conveying speed is adjusted according to the sheet's thickness and width, typically controlled between 2 and 8 meters per minute, ensuring the sheet enters the roll-type air quenching device smoothly without impact deformation.

[0027] The overall structural design of the roller-type air quenching unit takes into account the physical properties of stainless steel sheets at high temperatures. A temperature detection device is installed at the inlet to monitor the surface temperature distribution of the incoming sheet material in real time. When the sheet temperature falls below the preset minimum quenching temperature, the system automatically issues an alarm and suspends the processing. The unit's frame is welded from high-strength steel, possessing sufficient rigidity to withstand the enormous pressure generated during the roller pressing process.

[0028] The roller pressing assembly adopts a symmetrical upper and lower configuration. The upper roller pressing assembly achieves precise vertical positioning and pressure adjustment via a hydraulic system. The lower roller pressing assembly is fixedly mounted on the base of the device, providing a stable support platform for the sheet material. The gap between the upper and lower roller pressing assemblies can be precisely adjusted to accommodate sheet materials of different thicknesses, with an adjustment accuracy of 0.1 mm. This design ensures adaptability to sheet materials of different specifications while guaranteeing uniform pressure distribution during the roller pressing process.

[0029] The roller system is the core component of the roll forming assembly, employing a multi-roller parallel design. The diameter of each roller is optimized based on the width and thickness of the sheet material, typically between 50 mm and 100 mm. The roller surface features a special wear-resistant coating, capable of withstanding contact with high-temperature sheet material without wear. The roller speed is precisely controlled by a variable frequency motor, ensuring a constant movement speed of the sheet material during the roll forming process.

[0030] Multiple air outlets are designed in an array to cover the entire surface area of ​​the board. The number and position of the air outlets are configured according to the maximum processing size of the board, typically with 8 to 12 independent air outlets per square meter of board surface. The air outlets feature an adjustable angle design, which can adjust the airflow direction according to the geometry of the board surface to ensure that the airflow can evenly cover every area of ​​the board surface.

[0031] Step S11: Apply uniform pressure to the heated stainless steel sheet by adjusting the gap according to the sheet thickness using a roller system.

[0032] The roller system's gap adjustment mechanism employs a precision screw drive, automatically adjusted via a servo motor. The system first uses a laser thickness gauge to detect the actual thickness of the incoming sheet material, achieving a measurement accuracy of 0.01 mm. After the thickness data is transmitted to the control system, the system automatically calculates the optimal roller gap value. Determining the gap value requires consideration of the sheet material's coefficient of thermal expansion at high temperatures and the shrinkage during cooling.

[0033] In one possible implementation, for 3Cr13 stainless steel sheets with a thickness of 3 mm, the roller gap is typically set between 3.2 mm and 3.5 mm. This gap value provides sufficient pressure to prevent warping without causing indentations on the sheet surface due to excessive pressure. For 316L stainless steel sheets with a thickness of 6 mm, the gap value is adjusted accordingly to between 6.3 mm and 6.8 mm.

[0034] The application of uniform pressure is precisely controlled via a hydraulic system. This system employs proportional valve control technology, dynamically adjusting the pressure based on the real-time deformation of the sheet material. Pressure sensors are mounted on the support bearings of each roller, monitoring the pressure exerted on the roller in real time. When uneven pressure distribution is detected, the system automatically adjusts the hydraulic cylinder pressure in the corresponding area to ensure uniform pressure distribution across the entire width of the sheet material.

[0035] Deformation data is acquired through displacement sensors mounted on both sides of the roll forming assembly. These sensors utilize laser interferometry to detect micron-level deformation of the sheet metal. Each sensor collects data 1000 times per second, generating a continuous deformation monitoring curve. When the sheet metal exhibits deformation exceeding 0.5 mm in a certain area, the system immediately identifies and records this anomaly.

[0036] Step S12: Determine the pressure adjustment parameters of the roller pressing assembly based on the deformation data.

[0037] The deformation data analysis employs a real-time data processing algorithm. The system compares the collected displacement data with a preset standard deformation curve. The standard deformation curve is a database established based on the mechanical properties of different grades of stainless steel at different temperatures. When the measured deformation data deviates from the standard curve by more than a preset threshold, the system determines that pressure adjustment is necessary.

[0038] The preset threshold is determined based on the yield strength and modulus of elasticity of the stainless steel sheet. For example, at a high temperature of 1000 degrees Celsius, the yield strength is approximately 30% to 40% of that at room temperature. Therefore, the preset threshold is typically set to 2% to 3% of the sheet thickness. For instance, for a 5 mm thick sheet, the system will initiate a pressure adjustment procedure when the deformation exceeds 0.1 mm to 0.15 mm.

[0039] The calculation of pressure adjustment parameters takes into account the material properties of the sheet metal, the current temperature, and the degree of deformation. The system first calculates the stress distribution of the sheet metal under the current deformation state, and then determines the additional pressure to be applied based on the stress-strain relationship of the material. The pressure adjustment adopts a gradual increase method, with each adjustment controlled between 5% and 10% of the total pressure to avoid new deformation caused by sudden pressure changes.

[0040] In one embodiment, when an upward warping of 0.2 mm is detected in the central area of ​​the sheet material, the system calculates the required increase in pressure for that area. Assuming the current pressure is 50 Newtons per square centimeter, the system gradually increases the pressure in that area to 55 to 60 Newtons per square centimeter until the warping deformation is effectively controlled.

[0041] Step S13: Obtain the flatness index of the cooled board through the synergistic effect of the roller pressing assembly and multiple sets of air outlets.

[0042] Flatness indicators are measured using three-dimensional laser scanning technology, with the scanning equipment installed at the outlet of the roll-type air quenching device. The laser scanner can scan the entire surface of the sheet material in real time during its movement, generating high-precision three-dimensional topographic data. The scanning accuracy reaches 0.05 mm, accurately detecting minute undulations and deformations on the sheet material surface.

[0043] The synergistic effect is achieved by coordinating the operating parameters of the roll forming assembly and the air outlet through an integrated control system. When the air outlet starts operating, the strong airflow exerts additional force on the sheet material, which may affect the pressure distribution of the roll forming assembly. Therefore, the system adjusts the pressure parameters of the roll forming assembly in real time according to the operating status of the air outlet to ensure that the synergistic effect between the two is optimal.

[0044] In one possible implementation, when the upper air vent operates at a wind speed of 30 meters per second, it exerts downward pressure on the board material, which is approximately equivalent to 2 to 3 Newtons per square centimeter. The system will correspondingly reduce the pressure on the upper roller assembly to maintain overall pressure balance. Simultaneously, the operation of the lower air vent generates an upward airflow reaction force, and the system will also adjust the support force of the lower roller assembly accordingly.

[0045] The flatness evaluation criteria are determined based on the application requirements of the stainless steel sheet. For stainless steel sheets used in building decoration, the flatness requirement is typically a maximum deviation of no more than 2 mm per meter. For stainless steel sheets used in the manufacture of precision equipment, the flatness requirements are more stringent, with a maximum deviation of no more than 0.5 mm per meter.

[0046] Step S14: Determine the real-time pressure distribution of the roller pressing assembly based on the temperature sensor data during the cooling process.

[0047] The temperature sensor employs a combination of an infrared thermal imager and a contact thermocouple. The infrared thermal imager, mounted above the device, monitors the temperature distribution across the entire surface of the sheet material in real time, achieving a measurement accuracy of ±2 degrees Celsius. The contact thermocouple, mounted on the roller surface, directly measures the temperature at the point of contact with the sheet material, providing more precise temperature data for pressure adjustment.

[0048] The determination of real-time pressure distribution is based on the variation of the mechanical properties of stainless steel at different temperatures. As the temperature decreases, the yield strength and elastic modulus of stainless steel gradually increase, and its resistance to deformation also increases accordingly. Therefore, the pressure of the roller pressing assembly needs to be dynamically adjusted during the cooling process to adapt to the changes in material properties.

[0049] In one embodiment, when the sheet temperature decreases from 1000 degrees Celsius to 800 degrees Celsius, the yield strength of the material increases by approximately 20% to 30%. At this point, if the original pressure level is maintained, insufficient pressure may cause new deformation of the sheet. Therefore, the system automatically increases the rolling pressure according to the temperature change, typically by 15% to 25% of the original pressure.

[0050] Warping prevention is achieved through a predictive control algorithm. Based on the current temperature distribution and cooling rate, the system predicts the potential deformation trend of the sheet material during subsequent cooling. When the prediction indicates that warping may occur in a certain area, the system adjusts the pressure distribution in that area in advance, thereby effectively preventing deformation.

[0051] Step S2: The multiple air outlets are designed in an array distribution, including multiple independent controllable air outlets on the upper and lower sides.

[0052] The array-style distribution design is based on the uniform flow field theory in fluid mechanics. To create a uniform airflow distribution on the surface of the sheet, the air outlets are arranged in a rectangular array. The upper air outlet array contains several rows and columns of outlets, and the spacing between each outlet is optimized based on the maximum width of the sheet and the diffusion characteristics of the airflow. Typically, the outlet spacing is controlled between 50 mm and 100 mm to ensure that the airflow from adjacent outlets can effectively overlap and avoid dead zones.

[0053] The independently controllable air outlets are achieved through a combination of electrically adjustable valves and variable frequency fans. Each outlet is equipped with an independent electrically adjustable valve, which can precisely control the opening degree of the outlet, thereby regulating the airflow through that outlet. The variable frequency fan provides the air supply for the entire array, and the overall air supply pressure can be changed by adjusting the fan speed. This design allows each outlet to independently adjust its airflow and velocity, achieving differentiated cooling for different areas of the panel.

[0054] The high-pressure blower adopts a centrifugal fan design, featuring high pressure head and large flow rate. The blower's rated pressure typically ranges from 5000 Pa to 10000 Pa, generating a high-speed airflow of 20 to 40 meters per second. Equipped with a variable frequency drive (VFD), the blower can adjust its speed in real time according to cooling requirements. When rapid cooling is needed, the blower operates at its highest speed; when slow cooling is required, the blower speed is reduced accordingly.

[0055] The temperature sensors are configured using a distributed measurement scheme, with an independent temperature sensor installed near each air vent. The sensors employ fast-response resistance temperature detectors (RTDs) with a response time of less than one second, enabling them to promptly reflect changes in the surface temperature of the material. The sensor data is transmitted digitally to the central control system, which then uses the data from all sensors to comprehensively determine the overall temperature distribution of the material.

[0056] Step S21: The initial wind speed setting of each independently controllable air outlet is obtained by covering the entire surface of the stainless steel plate with an array of distributed air outlets.

[0057] Achieving full surface coverage requires precise calculation of the airflow diffusion range and overlap area. The airflow generated by each vent gradually diffuses after leaving the vent, typically at an angle between 15 and 25 degrees. Based on the distance between the vent and the board surface, the effective coverage area of ​​each vent can be calculated. By rationally arranging the location and number of vents, it is ensured that the entire board surface is within the effective airflow coverage range.

[0058] The initial airflow setting is determined based on the thermal conductivity characteristics of the stainless steel sheet and the required cooling rate. For thinner sheets, due to the relatively small heat capacity, a relatively low cooling airflow velocity is required, typically set to 15 to 25 meters per second. For thicker sheets, due to the large heat capacity, a higher airflow velocity is needed to achieve rapid cooling, typically set to 25 to 35 meters per second.

[0059] In one embodiment, the initial air velocity is set to 20 meters per second for 2 mm thick 3Cr13 stainless steel sheets. For 8 mm thick 316L stainless steel sheets, the initial air velocity is set to 32 meters per second. These settings are optimal parameters derived from extensive experimental data and theoretical calculations, ensuring effective cooling while preventing impact deformation of the sheets due to excessive air velocity.

[0060] Wind speed is measured in real time using a hot-wire anemometer. The hot-wire anemometer is installed at the outlet of each air vent and can accurately measure the actual airflow velocity. The measured data is compared with the set value; when the deviation exceeds 5%, the system automatically adjusts the fan speed or valve opening to ensure that the actual wind speed remains consistent with the set value.

[0061] Step S22: Based on the initial wind speed setting, air is blown in by a high-pressure fan to determine the convective heat exchange efficiency at high wind speed.

[0062] The calculation of convective heat exchange efficiency is based on the forced convection heat transfer theory in heat transfer. When a high-speed airflow flows over the surface of a plate, a boundary layer is formed on the plate surface. The thickness and characteristics of the boundary layer directly affect the heat transfer efficiency. The higher the air velocity, the thinner the boundary layer, the greater the heat transfer coefficient, and the higher the convective heat exchange efficiency.

[0063] In one possible implementation, the convective heat transfer coefficient is approximately 200 to 300 watts per square meter per Kelvin when the wind speed is 30 meters per second. When the wind speed increases to 40 meters per second, the convective heat transfer coefficient can be increased to 300 to 400 watts per square meter per Kelvin. This improvement is significant for rapid cooling and can significantly shorten cooling time.

[0064] Heat exchange efficiency is measured using heat flux density sensors. These sensors are installed at multiple locations on the surface of the material, directly measuring the heat flow per unit area. Combined with temperature difference data measured by temperature sensors, the actual convective heat transfer coefficient can be calculated. When the calculated heat transfer coefficient is lower than a preset value, it indicates insufficient convective heat exchange efficiency, requiring adjustment of the air outlet angle or increase in airflow velocity.

[0065] The angle of the air vents is automatically controlled by an electric actuator. Each vent is equipped with an adjustable baffle, the angle of which can be adjusted from vertically downward to tilted at 45 degrees. When the airflow blows vertically onto the surface of the material, the impact effect is strongest and the heat transfer efficiency is highest. When the airflow blows at an angle onto the surface of the material, it can form a tangential flow along the surface of the material, which helps to remove the thermal boundary layer from the surface of the material.

[0066] Step S23: The surface temperature of the board is monitored in real time by a temperature sensor to obtain temperature gradient data.

[0067] Temperature gradient data were acquired using a high-density temperature measurement point layout. A temperature measurement section was placed every 500 mm along the length of the board, and a measurement point was placed every 50 mm along the width. This layout forms a temperature monitoring network covering the entire surface of the board, enabling timely detection of uneven temperature distribution.

[0068] Real-time monitoring is achieved through a high-speed data acquisition system. The system collects temperature data 10 times per second, forming a continuous temperature change curve. When the temperature difference between adjacent measuring points exceeds 50 degrees Celsius, the system determines that there is an excessive temperature gradient and adjustment is required. An excessive temperature gradient can cause thermal stress inside the board, leading to deformation or cracking.

[0069] In one embodiment, the ideal temperature gradient should be controlled so that the temperature difference does not exceed 100 degrees Celsius per meter of length. For the width direction, the temperature difference should be controlled to not exceed 80 degrees Celsius per meter of width. Such a temperature gradient ensures that the stress distribution of the sheet material is relatively uniform during the cooling process, avoiding deformation due to excessive thermal stress.

[0070] The independently controllable air vents are precisely adjusted based on temperature gradient data. When the temperature in a certain area is significantly higher than the surrounding areas, the system increases the airflow from the corresponding vent in that area to enhance cooling. Conversely, when the temperature in a certain area is significantly lower than the surrounding areas, the system reduces the airflow in that area to prevent overcooling.

[0071] In step S3, during the cooling process, the roller pressing assembly and multiple sets of air outlets work together to achieve rapid cooling while ensuring the uniformity, flatness, and non-deformation of the board.

[0072] The core of this synergistic effect lies in the balanced control of roller pressure and airflow. During the cooling process, the sheet material expands and contracts due to temperature changes, while the impact of airflow also exerts additional forces on the material. The roller pressing assembly needs to adjust the pressure distribution in real time according to these changes to ensure that the sheet material remains flat at all times.

[0073] Rapid cooling is achieved through a phased control strategy. In the initial cooling phase, the sheet material temperature is high and its heat capacity is large, requiring forced cooling with maximum airflow. At this stage, the roller pressing assembly applies significant pressure to prevent warping due to rapid cooling. In the middle cooling phase, as the temperature decreases, the airflow is appropriately reduced, while the roller pressing pressure is adjusted to accommodate changes in material properties. In the later cooling phase, a lower airflow is used for fine-tuning to ensure the sheet material temperature drops uniformly to the target temperature.

[0074] Step S31: Obtain the real-time cooling rate of the stainless steel sheet through synergistic effect and determine the segmented control parameters.

[0075] During the cooling process, the real-time cooling rate is obtained using a multi-point temperature monitoring system installed within the roll-type air quenching device. Temperature sensors collect temperature data from various areas of the sheet surface 10 times per second, continuously recording temperature changes over time to create a cooling rate curve. The cooling rate is calculated based on the ratio of the temperature difference between adjacent time points to the time interval, ensuring timely reflection of the cooling rate in different areas of the sheet. After aggregating this data, the system analyzes the overall cooling rate distribution of the sheet, identifying any instances of excessively fast or slow cooling in certain areas.

[0076] The segmented control parameters are determined based on the dynamic changes in the cooling rate and the phase transformation characteristics of the stainless steel sheet. The cooling process is divided into three parts: an initial stage, an intermediate stage, and a final stage. The control parameters for each stage are specifically set according to the temperature range and material properties of the sheet. The initial stage mainly targets the high-temperature zone, aiming to rapidly reduce the sheet temperature below the phase transformation critical point; the intermediate stage focuses on uniform cooling to prevent localized stress concentration; and the final stage focuses on fine-tuning to ensure that the temperature drops uniformly to room temperature. The system dynamically adjusts the air velocity and roller pressure parameters for each stage based on the real-time cooling rate.

[0077] In one embodiment, for a 4 mm thick 3Cr13 stainless steel sheet, the initial cooling rate is set to 50 to 80 degrees Celsius per second, the intermediate cooling rate to 20 to 40 degrees Celsius per second, and the final cooling rate to 5 to 10 degrees Celsius per second. This segmented control method effectively avoids uneven phase transformation caused by excessively rapid cooling, while ensuring the overall flatness of the sheet.

[0078] Step S32: Based on the segmented control parameters, the temperature is rapidly reduced to below the critical point by using high wind speed through multiple sets of air outlets in the initial stage.

[0079] The initial high-velocity rapid cooling is achieved through the coordinated operation of the air outlet array. Based on segmented control parameters, the system sets the air velocity of all outlets to 30 to 40 meters per second, ensuring a powerful convective heat exchange effect. The high-velocity airflow quickly removes heat from the surface of the material, accelerating temperature reduction. The air velocity at the outlets is controlled by variable frequency fans, whose speed is dynamically adjusted according to the initial temperature and thickness of the material to meet the cooling requirements of different material sizes.

[0080] Temperature data below the critical point is collected in real time by temperature sensors. The critical point temperature is determined based on the specific grade of stainless steel. For example, for 3Cr13 stainless steel, the critical point temperature is typically around 850 degrees Celsius, while for 316L stainless steel, the critical point temperature may be slightly higher, around 900 degrees Celsius. The system continuously monitors temperature changes in various areas of the plate surface. When the temperature at all measuring points is below the critical point, the initial rapid cooling target is considered achieved.

[0081] In one possible implementation, for a 5 mm thick 3Cr13 stainless steel sheet, the initial high-speed wind is set to 35 meters per second, with the fan operating at maximum power for approximately 30 to 40 seconds. During this period, the sheet temperature rapidly decreases from 1050 degrees Celsius to below 800 degrees Celsius, ensuring that microstructural defects caused by uneven high-temperature phase transformation are avoided.

[0082] Step S33: The temperature sensor determines whether the temperature data avoids uneven phase transformation. If unevenness exists, pressure is applied through the roller pressing assembly to facilitate uniform cooling.

[0083] Temperature data analysis is performed through a central control system. The system compares the temperature values ​​at each measuring point in real time and calculates the temperature difference between different areas on the surface of the material. When the temperature difference between adjacent measuring points exceeds a preset value, such as 50 degrees Celsius, the system determines that there is a risk of uneven phase transformation. Uneven phase transformation can lead to the formation of different crystal structures inside the material, thereby affecting the material's mechanical properties and corrosion resistance.

[0084] If uneven temperature is detected, the system will immediately activate its adjustment mechanism. First, the airflow in the high-temperature area is increased through independently controllable vents to enhance localized cooling. Simultaneously, the roller pressing assembly adjusts its pressure parameters according to the temperature distribution, applying greater pressure to the high-temperature areas to prevent localized deformation caused by excessive heat. The roller pressing pressure is adjusted via a hydraulic system, typically by 10% to 20% of the original pressure, to avoid sudden pressure changes that could cause additional stress on the sheet material.

[0085] In one embodiment, when the temperature in the central region of the board is detected to be 850 degrees Celsius, while the temperature in the edge region has dropped to 800 degrees Celsius, the system increases the airflow speed at the corresponding vent in the central region from 30 meters per second to 38 meters per second, and simultaneously increases the pressure of the central region's roller pressing assembly from 50 Newtons per square centimeter to 58 Newtons per square centimeter. Through this coordinated adjustment, the overall temperature distribution of the board is ensured to become more uniform.

[0086] Step S34: In the intermediate stage, uniform cooling is achieved through medium wind speed, deformation monitoring data of the plate is obtained, and deformation is prevented by using a roller pressing assembly based on the deformation monitoring data.

[0087] The cooling objective in the intermediate stage is to maintain a uniform temperature decrease and avoid stress concentration caused by localized differences in cooling rates. The system adjusts the airflow velocity at the air outlets to 15 to 25 meters per second, creating a relatively gentle convective heat exchange effect. This medium airflow setting effectively controls the cooling rate, allowing the panel temperature to decrease at a relatively stable pace, typically between 20 and 40 degrees Celsius per second. The specific airflow velocity is dynamically adjusted based on the current temperature and thickness of the panel.

[0088] Deformation monitoring data is acquired through displacement sensors installed on both sides of the roll forming assembly. The displacement sensors collect deformation data from the sheet surface at a frequency of 1000 times per second, with a measurement accuracy of 0.01 mm. The system compares the collected deformation data with a preset standard deformation range. When the deformation in a certain area exceeds a preset threshold, such as 0.1 mm, a deformation risk is identified.

[0089] Based on deformation monitoring data, the roller pressing assembly applies targeted pressure adjustments to the sheet metal. The hydraulic system precisely controls the pressure of the rollers in the corresponding areas according to the location and degree of deformation. For example, when upward warping is detected at the edge of the sheet metal, the system increases the pressure of the upper roller pressing assembly in that area while reducing the support force of the lower roller pressing assembly, creating a downward corrective force to ensure the sheet metal returns to a flat state.

[0090] In one possible implementation, for a 6mm thick 316L stainless steel sheet, the intermediate stage air velocity is set to 20 meters per second, and the cooling rate is controlled at approximately 30 degrees Celsius per second. When a 0.15mm downward indentation is detected in the central area of ​​the sheet, the system increases the pressure of the lower roller assembly in that area from 40 Newtons per square centimeter to 48 Newtons per square centimeter, while keeping the pressure of the upper roller assembly constant, thus creating an upward corrective effect.

[0091] Step S35: In the final stage, fine adjustments are made using low wind speed to ensure that the temperature of the plate material drops evenly to room temperature, thus ensuring the overall flatness and non-deformation of the stainless steel plate material.

[0092] The goal of the final cooling stage is to uniformly reduce the board temperature to room temperature, typically 20 to 30 degrees Celsius, while avoiding prolonged cooling time due to an insufficient temperature gradient. The system adjusts the airflow velocity at the nozzles to 5 to 10 meters per second, creating a slight convective heat exchange effect. The low airflow velocity allows for precise temperature control, preventing new stresses from being generated in localized areas due to overcooling. The specific airflow velocity is fine-tuned based on the current temperature distribution of the board to ensure that the temperature decreases synchronously in all areas.

[0093] Temperature uniformity is determined using the final temperature distribution data collected by temperature sensors. The system statistically analyzes the temperature values ​​at each measuring point on the board surface and calculates the maximum temperature difference. When the maximum temperature difference is less than 10 degrees Celsius, the temperature is considered to have uniformly decreased to room temperature. Otherwise, the system continues to provide minor supplemental cooling to the high-temperature area through independently controllable air vents until the uniformity requirement is met.

[0094] Overall flatness is ensured through fine-tuning of the pressure in the final stage of the rolling assembly. During the final cooling process, the rolling assembly maintains a low pressure level, typically 30% to 50% of the initial pressure, to avoid excessive compression of the sheet material. Simultaneously, the system makes minor pressure adjustments to localized areas based on the final deformation data collected by displacement sensors, ensuring the sheet material remains flat at the end of cooling.

[0095] In one embodiment, for a 3 mm thick 3Cr13 stainless steel sheet, the final air velocity is set to 8 meters per second, and the cooling rate is controlled between 5 and 10 degrees Celsius per second. When the temperature of the edge area of ​​the sheet is detected to be 35 degrees Celsius while the temperature of the central area is 28 degrees Celsius, the system increases the airflow at the edge area vents to 10 meters per second until the temperature difference is reduced to within 5 degrees Celsius. Simultaneously, the rolling assembly applies slight pressure to the edge area to ensure that the final flatness meets the standard of a deviation of less than 1 mm per meter length.

[0096] Step S21: Obtain the air blowing parameters through the high-pressure blower to determine the wind speed control range.

[0097] The air intake parameters for a high-pressure blower include key indicators such as blower speed, supply pressure, and airflow rate. The system sets initial parameters via the blower's control panel. Blower speed is typically between 1000 and 3000 revolutions per minute, and supply pressure is controlled between 5000 and 10000 Pa. Airflow rate is determined based on the surface area of ​​the sheet material and the required cooling rate; generally, an airflow rate of 500 to 1000 cubic meters per minute corresponds to each square meter of sheet material surface.

[0098] The determination of the wind speed control range is based on the blowing parameters and the design characteristics of the air outlets. The outlet area and shape of each air outlet directly affect the wind speed. The system measures the actual wind speed value using an anemometer to ensure it matches the set value. The wind speed control range is typically divided into three intervals: high wind speed, medium wind speed, and low wind speed, corresponding to the cooling requirements of the initial, intermediate, and final stages, respectively. The high wind speed range is 30 to 40 meters per second, the medium wind speed range is 15 to 25 meters per second, and the low wind speed range is 5 to 10 meters per second.

[0099] In one possible implementation, for processing 3Cr13 stainless steel sheets with a width of 1.5 meters and a thickness of 3 millimeters, the high-pressure blower is set to a speed of 2500 rpm, an air supply pressure of 8000 Pa, and an air flow rate of 1200 cubic meters per minute. Based on these parameters, the system determines the initial wind speed control range to be 32 to 38 meters per second to ensure rapid cooling.

[0100] Step S22: Based on the wind speed control range, blow in ambient or low temperature air through an independent controllable air outlet to obtain auxiliary effect data of adding atomized water vapor.

[0101] The airflow method of the independently controllable air vents is selected based on the cooling stage and the temperature of the board material. In the initial stage, the system typically blows in ambient temperature air, with a temperature of 20 to 25 degrees Celsius, to achieve rapid cooling. In the middle and final stages, if further enhancement of the cooling effect is required, the system can switch to low-temperature air, with a temperature of 5 to 10 degrees Celsius, which is pre-cooled by refrigeration equipment. The valve opening and airflow speed of the air vents are precisely adjusted according to the airflow control range to ensure that the airflow evenly covers the surface of the board material.

[0102] The auxiliary effect of adding atomized water vapor is achieved by introducing a trace amount of water mist into the airflow. The water mist is generated by a high-pressure nozzle installed inside the air outlet. The water mist particle diameter is controlled between 10 and 50 micrometers to ensure uniform distribution with the airflow. Upon contact with the high-temperature board surface, the water mist evaporates rapidly, absorbing a large amount of heat and thus enhancing the cooling effect. Simultaneously, the vapor layer formed after the water mist evaporates reduces the direct impact between the airflow and the board surface, lowering the risk of localized stress concentration.

[0103] The auxiliary effect data is acquired through temperature and humidity sensors. The temperature sensor monitors the rate of temperature drop on the board surface before and after adding water mist, while the humidity sensor measures the water vapor content in the airflow to ensure that the amount of water mist is not too high, which could cause water stains or corrosion on the board surface. Based on this data, the system evaluates the degree to which the water mist improves the cooling effect; typically, adding water mist can increase the cooling rate by 10% to 20%.

[0104] In one embodiment, for a 6 mm thick 316L stainless steel sheet, during the initial cooling stage, the system blows in room temperature air at a wind speed of 35 meters per second, while simultaneously adding water mist through nozzles. The water mist volume is controlled at 0.5 liters per square meter of sheet surface per minute. After the water mist is added, the sheet temperature decrease rate increases from 60 degrees Celsius per second to 70 degrees Celsius per second, significantly shortening the cooling time.

[0105] Step S23: Monitor the cooling process using a temperature sensor to determine if the temperature has dropped rapidly below the critical point. If not, increase the fan speed to enhance the cooling rate.

[0106] Monitoring of the cooling process is achieved using infrared thermal imagers and contact thermocouples distributed above the surface of the sheet material. The infrared thermal imagers can generate a real-time temperature distribution map of the sheet material surface with a measurement accuracy of ±2 degrees Celsius. The contact thermocouples are installed in key locations to directly measure the temperature at the contact point between the sheet material and the roller, providing more accurate local temperature data. The system collects temperature data 10 times per second, forming a continuous cooling curve.

[0107] The determination to rapidly cool below the critical point is based on comparing temperature data with a preset critical point temperature. The critical point temperature is determined according to the stainless steel grade and thickness, and is typically between 800 and 900 degrees Celsius. When the temperature at all measuring points is below the critical point, the system determines that the rapid cooling target has been achieved. If the temperature in some areas is still above the critical point, the system will activate a wind speed enhancement mechanism.

[0108] The wind speed enhancement mechanism is achieved by increasing the rotational speed of the high-pressure fan and the opening degree of the air outlet valves. The wind speed is typically increased from the current value by 5 to 10 meters per second, for example, from 30 meters per second to 38 meters per second. At the same time, the system will prioritize increasing the wind speed at the air outlets corresponding to high-temperature areas, ensuring that the airflow is concentrated on the high-temperature areas and accelerating local cooling.

[0109] In one possible implementation, for a 4 mm thick 3Cr13 stainless steel sheet, the critical temperature is set to 850 degrees Celsius. When the temperature in the central area of ​​the sheet is still detected to be 880 degrees Celsius, the system increases the airflow speed at the central area vent from 32 meters per second to 40 meters per second, continues this operation for 10 seconds, and then reassesses the temperature distribution until the temperature in that area drops below 850 degrees Celsius.

[0110] Step S24: Based on the synergistic effect, determine the interaction between the blown air and the rolling assembly, and obtain a cooling uniformity index to avoid uneven phase change.

[0111] The interaction between the blown air and the rolling assembly is dynamically coordinated through an integrated control system. The system adjusts the airflow speed and rolling pressure parameters in real time based on the temperature distribution and deformation data of the sheet material. When the air outlet operates at a high airflow speed, the impact force of the airflow on the sheet material increases, and the system correspondingly reduces the pressure of the rolling assembly to prevent excessive total pressure from causing sheet deformation. Conversely, when the airflow speed is low, the system increases the rolling pressure to ensure the sheet material remains flat.

[0112] Cooling uniformity indices are obtained by analyzing temperature distribution and deformation data. Temperature uniformity is based on the maximum temperature difference across the sheet surface, typically requiring a maximum temperature difference of less than 50 degrees Celsius. Deformation uniformity is based on the maximum deformation across the sheet surface, typically requiring a deformation of less than 1 millimeter per meter of length. The system integrates these two indices to assess whether the cooling process has prevented uneven phase transformation.

[0113] In one embodiment, for a 5 mm thick 3Cr13 stainless steel sheet, during the initial cooling stage, the air vents operate at a wind speed of 35 meters per second, generating an impact force of 3 Newtons per square centimeter on the sheet. The system reduces the pressure of the rolling assembly from 50 Newtons per square centimeter to 47 Newtons per square centimeter to ensure overall pressure balance. The maximum temperature difference on the sheet surface was ultimately measured to be 40 degrees Celsius, and the maximum deformation was 0.8 mm, indicating that the cooling uniformity achieved the expected target.

[0114] Step S25: Ensure full coverage of the stainless steel sheet by array distribution, determine whether the cooling rate is improved compared to traditional air cooling, and obtain optimized mechanical property data.

[0115] The array-distributed full-surface coverage is achieved through the rational configuration of the location and number of air outlets. The air outlets are arranged in a rectangular grid, and the coverage area of ​​each outlet is determined based on the airflow diffusion angle and the distance between the outlet and the material. Typically, the outlet spacing is 300 mm to 500 mm to ensure effective overlap of airflow between adjacent outlets, forming a continuous airflow coverage layer. The system uses an anemometer to verify the actual coverage effect of each outlet, ensuring there are no dead zones in the airflow.

[0116] The cooling rate was compared with that of traditional air-cooling methods using experimental data. Traditional air-cooling methods typically employ natural convection or low-speed fans, with cooling rates generally ranging from 10 to 20 degrees Celsius per second. This method, however, utilizes high-speed forced convection, achieving cooling rates of 50 to 80 degrees Celsius per second, significantly higher than traditional methods. The system recorded temperature drop data at each stage of the cooling process, calculated the average cooling rate, and compared it with data from traditional air-cooling methods.

[0117] The optimized mechanical property data were obtained through tensile and hardness tests. Tensile tests measured the tensile strength and elongation of the sheet material, while hardness tests measured the surface hardness. These data reflect the impact of the cooling process on the microstructure of the sheet material; generally, rapid and uniform cooling can refine the grain structure and improve the material's strength and toughness. The system compares the test data with the performance data of sheets treated with traditional air cooling to assess the degree of performance improvement.

[0118] In one possible implementation, for 3 mm thick 3Cr13 stainless steel sheets, the average cooling rate of this method is 65 degrees Celsius per second, while the cooling rate of the conventional air-cooling method is 15 degrees Celsius per second. Tensile test results show that the tensile strength of the sheet treated by this method increases from 550 MPa to 580 MPa, and the elongation increases from 40% to 42%, indicating a significant improvement in mechanical properties.

[0119] Step S11: Obtain pressure distribution data of the roller pressing assembly by setting the upper and lower parts symmetrically to determine the continuous roller pressing effect on the stainless steel sheet.

[0120] The upper and lower symmetrically arranged roller pressing assemblies acquire pressure distribution data through a hydraulic system and pressure sensors. Each roller's support bearing is equipped with a pressure sensor, with a measurement accuracy of ±0.1 Newtons per square centimeter. The sensors collect pressure data at a frequency of 100 times per second, forming a continuous pressure distribution curve. The system analyzes this data to identify any uneven pressure distribution, ensuring that the pressure applied to the sheet material by the upper and lower roller pressing assemblies remains balanced.

[0121] The determination of the continuous rolling effect is based on pressure distribution data and the sheet material's moving speed. The roller speed is controlled by a variable frequency motor, typically between 10 and 30 revolutions per minute, ensuring the sheet material smoothly passes through the rolling zone at a speed of 2 to 8 meters per minute. The system evaluates whether the rolling effect achieves the expected target based on the pressure distribution data, i.e., no significant slippage or localized deformation of the sheet material during the rolling process.

[0122] In one embodiment, for a 3Cr13 stainless steel sheet with a width of 1.2 meters and a thickness of 3 millimeters, the system measured an average pressure of 48 Newtons per square centimeter for the upper roller assembly and 47.5 Newtons per square centimeter for the lower roller assembly, with a pressure distribution uniformity of over 95%. The sheet passed through the roller-pressing area at a speed of 5 meters per minute without slippage, indicating good continuous roller pressing effect.

[0123] Step S12: Based on the pressure distribution data, the plate is kept flat by an adjustable gap roller system to obtain stability indicators during the cooling process.

[0124] The adjustable-gap roller system achieves dynamic gap adjustment via a servo motor and precision screw drive. Based on pressure distribution data, the system calculates whether the current gap value is appropriate. When low pressure is detected in a certain area, the system reduces the roller gap in that area to increase local pressure; conversely, when high pressure is detected, the gap increases to reduce pressure. The gap adjustment accuracy is 0.1 mm, ensuring precise pressure adjustment.

[0125] Stability metrics during the cooling process are obtained through a combination of displacement and temperature sensors. The displacement sensor measures the surface deformation of the sheet material, while the temperature sensor measures the temperature distribution. The stability metrics are based on a combined score of deformation and temperature difference, typically requiring a deformation of less than 0.5 mm and a temperature difference of less than 50 degrees Celsius. The system uses this data to evaluate the stability performance of the sheet material during the cooling process.

[0126] In one possible implementation, for a 5 mm thick 316L stainless steel sheet, the system adjusts the roller gap from 5.5 mm to 5.3 mm based on pressure distribution data, increasing the pressure in the central region to 52 Newtons per square centimeter. The final measured sheet deformation was 0.3 mm, and the temperature difference was 45 degrees Celsius, indicating that the stability indicators met the expected requirements.

[0127] Step S13: By coordinating multiple sets of air outlets and roller pressing components, determine whether the stability index meets the uniform cooling requirements. If not, adjust the gap of the roller system.

[0128] The coordinated operation of multiple air outlets and roller pressing components is dynamically adjusted through an integrated control system. The system adjusts the pressure parameters of the roller pressing components in real time based on the operating status of the air outlets, ensuring a balance between airflow impact force and roller pressure. Simultaneously, the system monitors stability indicators to determine whether uniform cooling requirements are met. Uniform cooling typically requires a surface temperature difference of less than 50 degrees Celsius and a deformation of less than 0.5 millimeters.

[0129] If the stability indicators do not meet the requirements, the system will activate the roller system gap adjustment mechanism. For example, when the deformation of the edge area of ​​the board is detected to be 0.7 mm, the system will reduce the roller gap in the edge area from 5.5 mm to 5.2 mm, increasing the local pressure to 55 Newtons per square centimeter. At the same time, the air velocity at the edge area vents will be increased from 20 meters per second to 25 meters per second to enhance the cooling effect until the stability indicators return to the normal range.

[0130] In one embodiment, for a 4 mm thick 3Cr13 stainless steel sheet, initial testing showed an edge deformation of 0.6 mm and a temperature difference of 60 degrees Celsius. The system adjusted the roller gap in the edge area from 4.5 mm to 4.2 mm, while simultaneously increasing the airflow to 28 meters per second. After the adjustment, the deformation decreased to 0.4 mm, and the temperature difference decreased to 48 degrees Celsius, meeting the requirements for uniform cooling.

[0131] Step S14: Based on the temperature sensor data, determine the adaptability of the device to plates of different thicknesses to ensure that the method is suitable for continuous production.

[0132] Temperature sensor data is used to analyze the temperature changes of the sheet material during the cooling process. The system evaluates the adaptability of the device based on the heat capacity and thermal conductivity characteristics of sheets with different thicknesses. For thinner sheets, which have a smaller heat capacity and a faster cooling rate, the system needs to reduce the airflow velocity and roller pressure to avoid overcooling and deformation. For thicker sheets, which have a larger heat capacity and a slower cooling rate, the system needs to increase the airflow velocity and pressure to ensure effective cooling.

[0133] The adaptability of the equipment is achieved through a parametric control strategy. The system has a built-in database of cooling parameters for plates of different thicknesses, including parameters such as wind speed, roller pressure, and gap values. Operators only need to input the plate thickness, and the system automatically calls up the corresponding parameters, ensuring the equipment can adapt to the processing needs of plates of different specifications. This design makes the method suitable for continuous production environments, improving production efficiency.

[0134] Example 1: like Figure 1 As shown, the present invention provides a roll forming air quenching system for stainless steel sheets. The roll forming air quenching device includes roll forming components symmetrically arranged at the top and bottom and multiple sets of air outlets. The roll forming assembly adopts an adjustable gap roller system. The roller material is a high-temperature resistant alloy (such as Inconel 625) with a surface roughness Ra≤0.8μm. The gap is automatically adjusted according to the thickness of the sheet material (adjustment range 0.5-3mm) to continuously roll the sheet material, apply a uniform pressure of 0.5-2MPa, correct micro-deformation in real time, and maintain the flatness of the sheet material.

[0135] The multiple sets of air outlets are arranged in an array, with 4-6 independently controllable air outlets on each of the upper and lower sides. The outlet area of ​​each air outlet is 5-15 cm². 2 The overlap rate of the airflow coverage area of ​​adjacent air outlets is not less than 30%, and each air outlet is equipped with a high-pressure fan (air pressure ≥ 0.8MPa) and a temperature sensor (detection accuracy ± 0.5℃, response time ≤ 0.1s) to ensure complete coverage of the entire surface of the board. The cooling process involves blowing in ambient temperature (20-25℃) or low temperature (-10-0℃) air through a high-pressure fan. Atomized water vapor with a mass fraction of 5%-15% can be added to assist cooling as needed. The wind speed is controlled at 20-50m / s, and the air is blown in at an angle of 45°-60° to enhance the efficiency of convective heat exchange. Cooling is controlled in stages: in the initial stage (temperature 1050-800℃), high air velocity (40-50m / s) rapidly cools the material below the critical point to avoid uneven phase transformation; in the middle stage (temperature 800-400℃), medium air velocity (25-40m / s) ensures uniform cooling, and roller pressing further prevents deformation; in the final stage (temperature 400-room temperature), low air velocity (20-25m / s) is finely adjusted to ensure the material temperature drops uniformly to room temperature. During the cooling process, temperature sensors monitor the temperature of various parts of the board in real time, and the air volume of the corresponding area is adjusted through independent controllable air vents with an adjustment accuracy of ±1m / s to ensure that the temperature gradient of the board is less than 5℃ / cm, thus achieving uniform cooling. The quenched plates are output from the cooling outlet with a flatness error of less than 1 mm / m, sufficient martensitic transformation, and mechanical properties meeting the standards (hardness ≥ HRC50, impact toughness ≥ 80 J / cm). 2 ).

[0136] This invention also provides a roll-pressed gas quenching method for stainless steel sheets, the specific steps of which include: 1. When plate 1 enters the cooling zone from the heat treatment furnace outlet 6, the temperature is in the austenitic state (1050-1100℃). At this time, the upper roller pressing assembly 2 and the lower roller pressing assembly 3 immediately apply a pressure of 0.5-2MPa to the plate to eliminate the initial deformation of the plate caused by the high temperature.

[0137] 2. The simultaneously opened upper air outlet array 4 and lower air outlet array 5 impact the surface of the plate at an oblique angle with a wind speed of 20-50m / s. The airflow angle is controlled between 45° and 60°, so that the plate can be rapidly cooled from the austenitizing temperature to below the martensitic transformation temperature within 0.5-3 seconds, and the cooling rate can reach 50-100℃ / s.

[0138] 3. After the sheet metal enters the air quenching zone through cooling inlet 7, a temperature sensor monitors the surface temperature distribution in real time. When a localized high temperature is detected, the system automatically increases the airflow in the corresponding area to ensure that the temperature difference between the upper and lower surfaces of the sheet metal does not exceed 5°C. When the quenched sheet metal is output from cooling outlet 8, its martensitic transformation is complete.

[0139] This invention combines a rolling mechanism with independently controllable multiple air outlets to provide segmented cooling control and real-time temperature monitoring, ensuring that stainless steel sheets maintain flatness and uniformity during continuous production. It is an ingenious solution to the problem of heat sensitivity of highly corrosion-resistant materials.

[0140] The foregoing has provided a detailed description of a roll-pressed gas quenching method, system, and application for stainless steel plates, as provided in the embodiments of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and its core ideas; furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

[0141] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of illustrating the general principles of this application and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0142] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0143] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0144] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A method of roll gas quenching of stainless steel sheet material, characterized in that, The stainless steel plate rolling air quenching method comprises the following steps: S1: output the heated stainless steel plate from the heat treatment furnace into the rolling air quenching device; S2: set the upper and lower symmetrical rolling assembly and multiple groups of blowing ports in the rolling air quenching device; S3: continuously roll the stainless steel plate by adjusting the gap of the rolling assembly to apply uniform pressure; S4: array high-pressure air blowing through multiple groups of blowing ports; S3 and S4 are performed cooperatively.

2. The method of claim 1, wherein the stainless steel sheet is quenched by a roll quenching method. The pressure applied in the continuous rolling process in S3 is 0.5-2 MPa.

3. The method of claim 1, wherein the stainless steel sheet is a 300 series stainless steel sheet. The gap of the rolling assembly in S3 is adjusted according to the thickness of the plate, and the flatness error of the rolled stainless steel plate is less than 1 mm / m.

4. The method of claim 1, wherein the stainless steel sheet is a 300 series stainless steel sheet. In S4, the array high-pressure air blowing is specifically: 4-6 blowing ports are arranged on each of the upper and lower sides, and the angle of the blowing port is adjusted to 45°-60° inclined blowing.

5. The method of claim 1, wherein the stainless steel sheet is a 300 series stainless steel sheet. The high-pressure air blown in S4 is normal temperature or low temperature air, and the high-pressure air blown in is also added with atomized water vapor auxiliary, and the wind speed of the high-pressure air blowing is controlled at 20-50 m / s, and the cooling rate reaches 50-100 ℃ / s.

6. The method of claim 1, wherein the stainless steel sheet is a 300 series stainless steel sheet. After multiple groups of blowing ports are set in S2, temperature sensors are also set to monitor the temperature gradient in real time to ensure that the temperature gradient of each part of the stainless steel plate is less than 5 ℃ / cm.

7. The method of claim 1, wherein the stainless steel sheet is a 300 series stainless steel sheet. The thickness of the stainless steel plate in S1 is 0.5-3 mm, and the stainless steel plate is a martensitic stainless steel.

8. A system for roll gas quenching of stainless steel sheet material for the method of roll gas quenching of stainless steel sheet material according to any one of claims 1 to 7, characterized in that The stainless steel plate rolling air quenching system comprises: upper and lower symmetrical rolling assemblies and multiple groups of blowing ports: The rolling assembly adopts a roller shaft system with adjustable gap, the roller shaft material is high-temperature resistant alloy, the surface roughness Ra is ≤0.8 μm, the gap is automatically adjusted according to the thickness of the plate, the adjustment range is 0.5-3 mm, the plate is continuously rolled, and 0.5-2 MPa uniform pressure is applied; The multiple groups of blowing openings are arrayed, 4-6 independent controllable blowing openings are arranged on the upper side and the lower side respectively, the area of the blowing opening of a single blowing opening is 5-15 cm 2 , and the overlapping rate of the airflow coverage area of adjacent blowing openings is not less than 30%.

9. The stainless steel plate rolling air quenching system of claim 8, each blowing port of the multiple groups of blowing ports is equipped with a high-pressure fan and a temperature sensor, the air pressure of the high-pressure fan is ≥0.8 MPa, the detection accuracy of the temperature sensor is ±0.5 ℃, and the response time is ≤0.1 s.

10. Use of a stainless steel sheet roll quenching method, characterized by The stainless steel plate rolling air quenching method of any one of claims 1-7 is used for producing stainless steel products in the tool, kitchenware or building field.

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