Stress treatment system and method

Abstract

The invention provides a stress treatment system and method, and belongs to the technical field of ship manufacturing. The system comprises a pressurizing control system and a stress monitoring system. The pressurizing control system can control the pressurizing process based on the target pressure change curve determined by the test in advance, namely, the pressure applied to the to-be-treated workpiece can be controlled to change according to the target pressure change curve, so that the to-be-treated workpiece can be in the optimal stress state, and the service life of the to-be-treated workpiece can be prolonged. Meanwhile, automatic and accurate control over the pressure in the pressurizing process can be achieved, stress relief can be completed in a shorter time, and the stress relief efficiency is improved. The stress monitoring system can collect the strain data of at least one position point of the to-be-processed workpiece in the pressurizing process and transmit the strain data to the pressurizing control system, the strain condition of the to-be-processed workpiece in the pressurizing process can be monitored through the stress monitoring system, and therefore the safety and reliability of the stress processing process can be ensured.

Description

Technical Field

[0001] The present application relates to the field of shipbuilding technology, and in particular to a stress management system and method. Background Art

[0002] As global energy demand grows, the demand for liquefied petroleum gas (LPG), a clean energy source, is increasing in maritime transport. On ships carrying liquefied gases in bulk, C-type tanks are widely used for transporting LPG and other liquefied gases due to their structural advantages. These tanks are typically constructed of carbon steel or carbon-manganese steel to ensure structural strength and safety. However, due to the special requirements of C-type tanks and their use in low-temperature environments, the welding process and subsequent stress management during their manufacture are particularly important.

[0003] For example, according to the relevant specifications for the construction and equipment of a certain bulk liquefied gas vessel, for Type C independent liquid cargo tanks with a design temperature below -10°C, post-weld heat treatment is required after welding to release residual stresses generated during the welding process. However, for large Type C liquid cargo tanks and pressure vessels, due to their large size, traditional post-weld heat treatment is not only costly but also difficult to implement. Therefore, the specifications allow the use of a pressurization method to perform mechanical stress relief tests under specific conditions as an alternative to heat treatment. This method achieves the purpose of stress relief by filling the tank with water or air.

[0004] Although pressure charging offers a potential alternative to heat treatment, the specification does not provide a standard for determining the charging pressure. This makes it difficult for engineers to precisely control the charging pressure to ensure that the stress level of the tank during stress relief does not exceed the specified upper limit. Summary of the Invention

[0005] The main purpose of the embodiments of the present application is to propose a stress processing system and method, which aims to control the charging process based on the pressure change curve corresponding to the optimal stress state of the workpiece to be processed determined in advance, so as to achieve precise pressure control; by real-time collection of strain data during the charging process to monitor whether the workpiece to be processed is in a safe stress state, the safety and effectiveness of the charging process can be ensured.

[0006] To achieve the above objectives, a first aspect of an embodiment of the present application provides a stress management system, comprising:

[0007] A pressure control system for controlling the pressure change applied to the workpiece to be processed based on a target pressure change curve, wherein the target pressure change curve is a curve of the pressure change over time corresponding to the optimal stress state of the workpiece to be processed determined based on pre-tests;

[0008] A stress monitoring system is connected to the charging control system. The stress monitoring system is used to collect strain data of at least one position point of the workpiece to be processed during the charging process, and send the strain data to the charging control system so that the charging control system can monitor whether the workpiece to be processed is in a safe stress state based on the strain data.

[0009] In one embodiment of the present application, the charging pressure control system is further configured to control and adjust the pressure applied to the workpiece to be processed when it is detected that the strain data is greater than a preset threshold.

[0010] In one embodiment of the present application, the charging pressure control system includes a water supply device, a communication pipeline, a pressure sensor and a PLC control system;

[0011] The water supply device is connected to the container where the workpiece to be processed is located through the connecting pipeline;

[0012] A water pump and a pressure regulating valve are provided on the communication pipeline, and the pressure regulating valve and the pressure sensor are both electrically connected to the PLC control system;

[0013] The pressure sensor is used to monitor the pressure corresponding to the workpiece to be processed in real time and feed back to the PLC control system;

[0014] The PLC control system is used to control the opening of the pressure regulating valve to control the pressure applied to the workpiece to be processed to change according to the target pressure change curve.

[0015] In one embodiment of the present application, the charging pressure control system further includes a water pressure buffer tank, which is connected to the communication pipeline.

[0016] In one embodiment of the present application, the charging control system further includes a temperature sensor, which is electrically connected to the PLC control system and is used to collect the water temperature of the workpiece to be processed and feed the collected water temperature back to the PLC control system;

[0017] Correspondingly, the PLC control system is used to control the water temperature of the injected water to be increased when it is detected that the water temperature of the workpiece to be processed is lower than the set temperature and the difference between the water temperature and the set temperature is greater than the set value.

[0018] In one embodiment of the present application, the stress monitoring system includes at least one strain gauge and at least one data collector; the strain gauge is arranged on the workpiece to be processed, and is used to collect strain data at the location where the strain gauge is located. The data collector is electrically connected to the strain gauge, and the data collector is also electrically connected to the PLC control system to transmit the strain data collected by the strain gauge to the PLC control system, so that the PLC control system monitors whether the workpiece to be processed is in a safe stress state based on the strain data.

[0019] In one embodiment of the present application, when there are multiple strain gauges, the multiple strain gauges are respectively arranged at different positions of the workpiece to be processed to collect strain data at different positions of the workpiece to be processed; correspondingly, the data collector is a multi-channel data collector to transmit the strain data of different positions of the workpiece to be processed collected by the multiple strain gauges to the PLC control system.

[0020] In one embodiment of the present application, the system further includes an alarm system, which is electrically connected to the charging pressure control system. The charging pressure control system is also used to control the alarm system to issue an alarm when it is monitored according to the strain data that the workpiece to be processed is not in a safe stress state.

[0021] To achieve the above-mentioned purpose, a second aspect of an embodiment of the present application provides a stress treatment method for a workpiece to be treated, which is performed based on the system described in any embodiment of the present application, and the method includes:

[0022] Controlling the pressure change applied to the workpiece to be processed based on a target pressure change curve, wherein the target pressure change curve is a curve of the pressure change over time corresponding to the workpiece to be processed under an optimal stress state determined based on an experiment;

[0023] Strain data of at least one position point of the workpiece to be processed during the pressurization process is acquired, and whether the workpiece to be processed is in a safe stress state is monitored based on the strain data.

[0024] In one embodiment of the present application, during the process of controlling the pressure change applied to the workpiece to be processed based on the target pressure change curve, if the monitored strain data is greater than a preset threshold, the pressure applied to the workpiece to be processed is controlled and adjusted.

[0025] In the technical solution provided in the embodiment of the present application, the stress treatment system includes a pressure charging control system and a stress monitoring system. The pressure charging control system can control the pressure charging process of the workpiece to be treated based on the target pressure change curve corresponding to the workpiece to be treated under the optimal stress state determined in advance by the test, that is, control the pressure applied to the workpiece to be treated to change according to the target pressure change curve, so that the workpiece to be treated can be in the optimal stress state, thereby extending the service life of the workpiece to be treated. At the same time, automatic and precise control of the pressure during the pressure charging process can be achieved, stress elimination can be completed in a shorter time, and the stress elimination efficiency can be improved. The stress monitoring system can collect the strain data of at least one position point of the workpiece to be treated during the pressure charging process and transmit it to the pressure charging control system, and the strain condition of the workpiece to be treated during the pressure charging process can be monitored through the stress monitoring system, thereby ensuring the safety and reliability of the stress treatment process.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a first structural block diagram of a stress management system provided in one embodiment of the present application.

[0028] Figure 2 This is an example diagram of a target pressure change curve determined based on a preliminary test, provided in an embodiment of the present application.

[0029] Figure 3 This is a second structural block diagram of the stress management system provided in one embodiment of the present application.

[0030] Figure 4 Schematic diagram of the structure of a stress management system provided in one embodiment of the present application.

[0031] Figure 5 This is a schematic diagram of strain data obtained by measuring a strain gauge provided by an embodiment of the present application.

[0032] Figure 6 This is a flowchart of a stress treatment method provided in one embodiment of the present application.

[0033] Description of reference numerals:

[0034] 100. Charging control system, 200. Stress monitoring system, 30. Workpiece to be processed, 300. Alarm system, 110. Water supply device, 120. Connecting pipeline, 130. Pressure sensor, 140. PLC control system, 150. Water pressure buffer tank, 160. Temperature sensor, 121. Water pump, 122. Pressure regulating valve, 210. Strain gauge, 220. Data collector. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0036] It should be noted that although the device schematics illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the device or the sequence in the flowcharts. The terms "first," "second," and so on, in the specification, claims, and drawings, are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0038] The heat treatment process for carbon steel and carbon-manganese steels with yield stress to ultimate tensile strength ratios greater than 0.8 presents numerous challenges in the fabrication of C-type independent cargo tanks and large pressure vessels. These challenges primarily stem from the mechanical properties and corrosion resistance requirements of the materials under high-stress environments. Consequently, relevant industry standards, such as the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk, ASME VIII-1UG-99, and EN13530 Annex A, impose strict specifications on the material heat treatment process to ensure structural safety and reliability.

[0039] The low efficiency of eliminating mechanical stress during heat treatment is an important technical problem currently faced by the manufacturing field, especially in the manufacturing process of C-type independent cargo holds and large pressure vessels, where the requirements for heat treatment are more stringent. Existing technologies often fail to effectively meet these high requirements, resulting in residual mechanical stress. Specifically, there is obvious stress concentration on the surface and inside of the product after heat treatment, which in turn affects the safety and reliability of the product. The technical reasons for this problem are mainly due to the limitations of traditional heat treatment processes, such as uneven heating and cooling rates, and uneven thermal stress distribution due to the complex geometry of the workpiece to be treated. These factors together make it difficult to eliminate mechanical stress, which in turn leads to increased manufacturing costs and decreased product performance. Therefore, there is an urgent need to conduct in-depth research on the stress elimination efficiency during heat treatment in order to develop more effective mechanical stress elimination technologies, ensure strict control of product quality during the manufacturing process, and improve overall production efficiency and economy.

[0040] Relevant industry standards and specifications allow the use of pressurization methods to perform mechanical stress relief tests under specific conditions as an alternative to heat treatment. This method achieves stress relief by filling the tank with water or air.

[0041] Although the pressurization method can solve the problems that arise during the heat treatment process to a certain extent, its implementation details have not yet been fully clarified. There are problems such as poor stress relief effect or complicated operation process in certain circumstances, which lead to limitations in the application of the technology.

[0042] Based on this, an embodiment of the present application proposes a stress treatment system, which aims to control the charging process according to the curve of pressure change over time corresponding to the optimal stress state of the workpiece to be processed determined in advance by experiments, so as to achieve precise pressure control; by real-time collection of strain data during the charging process to monitor whether the workpiece to be processed is in a safe stress state, the safety and effectiveness of the charging process can be ensured.

[0043] The stress treatment system provided in the embodiment of the present application utilizes a pressurization method to eliminate workpiece stress. The principle is: a pressure medium (such as water, oil or gas) is applied to the inside or outside of a workpiece (such as a pressure vessel, a pipeline, a marine C-type storage tank, etc.) to superimpose the external pressure on the residual stress inside the material. When the superimposed stress exceeds the local yield strength of the material, the area undergoes plastic deformation, releasing the original residual stress. For example, the high residual stress area in the welded structure of a C-type independent liquid cargo tank is preferentially deformed under the action of external pressure, and the residual stress is significantly reduced after pressure relief. Specifically, by performing staged pressurization and pressure-maintaining operations, the internal stress of the workpiece material can be redistributed to a balanced state, thereby reducing the phenomenon of local stress concentration. The pressurization method can cover complex geometric areas and avoid deformation problems caused by traditional heat treatment.

[0044] Reference Figure 1 , Figure 1 This is a first structural block diagram of a stress management system provided in one embodiment of the present application. The stress management system includes a pressure control system 100 and a stress monitoring system 200, and the pressure control system 100 is connected to the stress monitoring system 200.

[0045] The pressure control system 100 is used to control the pressure applied to the workpiece 30 based on a target pressure curve. The target pressure curve is a time-varying curve corresponding to the optimal stress state of the workpiece 30, determined based on pre-testing. Different workpiece sizes and materials will correspond to different target pressure curves. Specifically, the target pressure curve is a pressure-time relationship curve determined through pre-testing to achieve the optimal stress state for the workpiece 30 during the pressure-relief process. Its core principle is to fully release and redistribute residual stress within the workpiece 30 through dynamic pressure regulation. For example, representative specimens made of the same material as the workpiece 30 can be selected for compression stress-strain testing to determine key parameters such as the material's yield strength and elastic modulus. Finite element analysis (FEA) is then used to simulate the stress distribution under different pressure parameters and identify the optimal pressure range (e.g., an initial pressure of 30% to 50% of the yield strength). Combined with the real-time collection of specimen strain data by the optical fiber strain gauge, the pressure increase rate and the pressure holding time are adjusted until the residual stress measurement value is lower than the set value of the material yield strength (such as 10%), and finally multiple rounds of tests are carried out to ensure the stability and repeatability of the determined target pressure change curve. The specifications and sizes of the workpiece 30 to be processed are different, and the corresponding target pressure change curves are different. For example, for large-sized or complex-structured workpieces (such as pressure vessels and special-shaped pipes), the pressure holding time needs to be extended and the pressure increase rate needs to be reduced to avoid local stress concentration leading to deformation or cracking. Thick-walled workpieces need to be pressurized in stages (such as an increase of ≤10% of the design pressure in each stage) to ensure that the pressure gradient is evenly transmitted to the internal area. The materials of the workpiece 30 to be processed are different, and the corresponding target pressure change curves are different. For example, high-yield strength materials (such as stainless steel) need to set a higher initial pressure to trigger effective plastic deformation. Brittle materials (such as cast iron) need to strictly control the pressure increase rate to prevent stress mutations from causing cracks.

[0046] Reference Figure 2 , Figure 2 This is an example diagram of a target pressure change curve based on a pre-test determined in accordance with an embodiment of the present application. Figure 2As shown, the target pressure change curve includes multiple stages. Among them, 0~t1 is the first pressure increasing stage, and its corresponding slope is the pressure filling rate of the first pressure increasing stage. t1~t2 is the first pressure holding stage, and t2-t1 is the corresponding pressure holding time. t2~t3 is the second pressure increasing stage, and its corresponding slope is the pressure filling rate of the second pressure increasing stage. t3~t4 is the second pressure holding stage, and t4-t3 is the corresponding pressure holding time. t4~t5 is the first pressure releasing stage, and its corresponding slope is the pressure releasing rate of the first pressure releasing stage. t5~t6 is the third pressure holding stage, and t6-t5 is the corresponding pressure holding time. t6~t7 is the second pressure releasing stage, and its corresponding slope is the pressure releasing rate of the second pressure releasing stage. The embodiment of the present application can divide the pressure filling process into multiple pressure gradients according to the material yield strength, residual stress distribution and geometric characteristics of the workpiece to be processed, and the pressure increment in each stage must avoid exceeding the local yield limit of the material. Maintaining a constant pressure for a set time under each pressure gradient causes the internal grains of the material to slip and dislocation rearrange, promoting the homogenization of residual stress. Among them, the holding time needs to be adjusted in combination with the plastic deformation rate of the material. For example, high-strength steel requires a longer holding time (such as 10 minutes / stage), while aluminum alloy can be shortened to 5 minutes / stage. After reaching the target pressure, the pressure is gradually released according to the gradient to avoid stress rebound. Staged pressurization can avoid the loss of control of local plastic deformation caused by a single high pressure, and release the residual stress along the cross-sectional gradient. Step-by-step pressure relief can reduce elastic rebound and reduce the reverse residual stress caused by too fast pressure relief. During the test, finite element simulation (such as Abaqus) can also be combined to predict the stress distribution of the workpiece, and the pressure gradient and holding time can be dynamically adjusted to avoid local overload or underpressure areas.

[0047] The stress monitoring system 200 is used to collect strain data from at least one location on the workpiece 30 during the pressurization process and transmit this strain data to the pressurization control system 100, enabling the pressurization control system 100 to monitor whether the workpiece 30 is in a safe stress state based on the strain data. Specifically, after receiving the strain data corresponding to the workpiece 30, the pressurization control system 100 converts the strain data into stress using the following formula: σ = E * ε. Here, σ is stress, E is the material elastic modulus, and ε is the strain value. The elastic modulus is obtained through material testing or table lookup. The converted stress value is then compared with a pre-set stress threshold. The stress threshold can be set based on the yield strength of the workpiece material. For example, for steel, a stress threshold of 60% to 80% of the yield strength is typically used. When the stress value converted from the strain data is less than or equal to the stress threshold, the workpiece 30 is in a safe stress state. When the stress value converted from the strain data is greater than the stress threshold, the workpiece 30 is not in a safe stress state.

[0048] In some embodiments, the charging control system 100 is also used to control and adjust the pressure applied to the workpiece 30 to be processed when the strain data is monitored to be greater than a preset threshold. Theoretically, by controlling the pressure applied to the workpiece 30 to be processed to change according to the target pressure change curve, the workpiece 30 to be processed can achieve the optimal stress state during the stress relief process. The embodiment of the present application takes into account that the target pressure change curve is determined based on a preliminary test, and a representative specimen of the same material as the workpiece 30 to be processed is selected for experimental determination. In the actual stress treatment process according to the target pressure change curve, there may be a situation where the strain exceeds the safe strain threshold. Therefore, the embodiment of the present application sets the safe strain threshold (i.e., the preset threshold) in advance according to the yield strength of the material of the workpiece 30 to be processed, and automatically triggers the pressure regulation mechanism when the strain data is monitored to be greater than the preset threshold, such as the pressure applied to the workpiece 30 to be processed can be adjusted in real time through a dynamic feedback algorithm.

[0049] Reference Figure 3 , Figure 3 This is a second structural block diagram of the stress processing system provided by an embodiment of the present application. Figure 3 The stress treatment system includes a pressure charging control system 100, a stress monitoring system 200 and an alarm system 300, and the stress monitoring system 200 and the alarm system 300 are both connected to the pressure charging control system 100. The pressure charging control system 100 is also used to control the alarm system 300 to issue an alarm when it is detected according to the strain data that the workpiece 30 to be processed is not in a safe stress state. Among them, the alarm system 300 may include an acoustic alarm circuit or a light alarm circuit or an acoustic and light alarm circuit, that is, the alarm system 300 can adopt an acoustic alarm circuit, which can issue an acoustic alarm to remind the pressure charging abnormality when it is detected that the workpiece 30 to be processed is not in a safe stress state. The alarm system 300 can also adopt a light alarm circuit, which can issue a light alarm (such as a light on or a flashing light) to remind the pressure charging abnormality when it is detected that the workpiece 30 to be processed is not in a safe stress state. The alarm system 300 can also adopt an acoustic and light alarm circuit, which can simultaneously issue an acoustic and light alarm to remind the pressure charging abnormality when it is detected that the workpiece 30 to be processed is not in a safe stress state.

[0050] Reference Figure 4 , Figure 4 Schematic diagram of the structure of the stress treatment system provided by an embodiment of the present application. Figure 4As shown, the pressure control system 100 includes a water supply device 110, a communication line 120, a pressure sensor 130, and a PLC control system 140. The water supply device 110 is connected to the interior of the workpiece 30 to be processed or the container in which the workpiece 30 is located via the communication line 120. Specifically, if the workpiece 30 to be processed is a pressure container, such as a C-type storage tank or a pipeline, the water supply device 100 is connected to the interior of the workpiece 30 to be processed via the communication line 120, so that water can be injected into the interior of the workpiece 30 to change the pressure applied to the workpiece 30 to be processed. Alternatively, the workpiece 30 to be processed can be placed in a sealed container. In this case, the water supply device 100 is connected to the container in which the workpiece 30 is located via the communication line 120, so that water can be injected into the container in which the workpiece 30 is located to change the pressure applied to the workpiece 30 to be processed. The connecting pipeline 120 is equipped with a water pump 121 and a pressure regulating valve 122. The pressure regulating valve 122 and the pressure sensor 130 are both electrically connected to a PLC control system 140. The PLC control system 140 is configured to control the opening of the pressure regulating valve 122 to adjust the pressure applied to the workpiece 30 to follow a target pressure profile. The water pump 121 is configured to pump water from the water supply device into the workpiece 30 or into the container containing the workpiece 30. The pressure regulating valve may include a regulating valve and an electric valve. By controlling the opening of the pressure regulating valve 122, the PLC control system 140 can control the water injection flow rate and, therefore, the pressure applied to the workpiece 30. The pressure sensor 130 is configured to monitor the pressure of the workpiece 30 in real time. Specifically, the pressure sensor 130 can monitor the pressure applied to the workpiece 30 in real time, thereby determining whether the pressure applied to the workpiece 30 follows the target pressure profile.

[0051] Reference Figure 4 The pressure control system 100 further includes a water pressure buffer tank 150, which is connected to the communication pipeline 120. The water pressure buffer tank 150 can absorb instantaneous changes in water pressure (such as water pump start-up and stop, valve adjustment) through the automatic expansion / contraction of the air bag or diaphragm, thereby controlling pressure fluctuations within a reasonable range and avoiding severe fluctuations in system pressure.

[0052] Reference Figure 4, the pressurization control system 100 also includes a temperature sensor 160, which is electrically connected to the PLC control system 140. The temperature sensor 160 is used to collect the water temperature of the workpiece 30 to be processed, and feed the collected water temperature back to the PLC control system 140. The embodiment of the present application takes into account that the water injection temperature can affect the yield strength of the material. For example, an increase in water temperature can reduce the yield strength of the material, so that the pressure transmitted by the water during the pressurization process is more likely to cause plastic deformation of the material and promote the release of residual stress. In a low temperature environment, certain high-strength steels (such as heat-resistant steels containing Cr and Ni) are prone to brittle fracture. By adjusting the water temperature to maintain the medium temperature, cracks can be avoided during pressurization. However, excessively high water temperature may reduce the viscosity of water, resulting in uneven pressure transmission during the pressurization process. Therefore, in the use of the pressurization method for mechanical stress elimination, combined with water temperature control, the lattice slip range inside the material can be expanded to effectively offset residual stress. Specifically, the pressure control system 100 injects water of a set temperature (such as 45°C) into the workpiece to be processed 30 or into the container where the workpiece to be processed 30 is located, and controls the water injection flow rate by adjusting the opening of the pressure regulating valve 122, thereby controlling the pressure applied to the workpiece to be processed 30. By setting a temperature sensor 160 in the workpiece to be processed 30 or in the container where the workpiece to be processed 30 is located, the temperature of the water injected into the workpiece to be processed 30 or in the container where the workpiece to be processed 30 is located can be monitored. The temperature sensor 160 is electrically connected to the PLC control system 140, so that the PLC control system 140 can control the increase of the water temperature when it is detected that the water temperature of the workpiece to be processed 30 is lower than the set temperature and the difference between the water temperature and the set temperature is greater than the set value. For example, 50°C warm water circulation pressure is used. During the pressure charging process, such as in the first pressure holding stage, the water temperature of the workpiece to be processed 30 is monitored by the temperature sensor 160. When the water temperature of the workpiece 30 being processed is detected to be 30°C, and the difference between the water temperature (30°C) and the set temperature (50°C) is greater than the set value (20°C), the water temperature can be increased. This means that higher temperature water can be injected during the subsequent pressurization process, thereby maintaining the water temperature roughly around the set temperature throughout the entire pressurization process, thereby helping to eliminate residual stress.

[0053] Reference Figure 4The stress monitoring system 200 includes at least one strain gauge 210 and at least one data collector 220. The strain gauge 210 is installed on the workpiece 30 to be processed and is used to collect strain data at the location where the strain gauge 210 is located. The data collector 220 is electrically connected to the strain gauge 210. The data collector 220 is also electrically connected to the PLC control system 140 to transmit the strain data collected by the strain gauge 210 to the PLC control system 140, so that the PLC control system 140 can monitor whether the workpiece 30 to be processed is in a safe stress state based on the strain data. The strain gauge 210 may include a vibrating wire strain gauge, a resistance strain gauge, a piezoresistive strain gauge, and an optical fiber strain gauge. The optical fiber strain gauge has high sensitivity and can collect strain data in real time. The strain gauge 210 can be installed at key locations on the workpiece 30 to monitor strain data at key locations on the workpiece 30 to be processed.

[0054] When there are multiple strain gauges 210, each of the multiple strain gauges 210 can be positioned at different locations on the workpiece 30 to collect strain data at the different locations on the workpiece 30. Accordingly, the data collector 220 is a multi-channel data collector that transmits the strain data collected by the multiple strain gauges 210 at different locations on the workpiece 30 to the PLC control system 140. This allows the PLC control system 140 to obtain strain data at different locations on the workpiece 30, thereby monitoring the strain conditions at different locations on the workpiece 30 during the pressurization process.

[0055] For example, referring to Figure 5 , Figure 5 FIG. 1 is a schematic diagram of strain data obtained by measuring a strain gauge according to an embodiment of the present application. Figure 5 As shown, eight measuring points are selected on the workpiece 30 to be processed. Strain gauges 210 are placed at each of these eight measuring points to measure the strain data corresponding to each of these eight measuring points. The strain data corresponding to these eight measuring points can then be transmitted to the PLC control system 140 via a multi-channel data acquisition device 220.

[0056] In the embodiment of the present application, a strain gauge 210 is respectively set at different positions of the workpiece 30 to achieve synchronous monitoring of multi-point strain, so as to locate areas with abnormally high stress in the workpiece 30 to be processed (such as welds, corners, etc.), thereby avoiding the risk of fracture due to local stress concentration.

[0057] Reference Figure 6 , Figure 6 This is a flowchart of a stress management method provided in one embodiment of the present application, which is executed by the stress management system provided in any embodiment of the present application, including but not limited to steps S610 to S620.

[0058] Step S610, controlling the pressure change applied to the workpiece to be processed based on a target pressure change curve, wherein the target pressure change curve is a curve of pressure change over time corresponding to the workpiece to be processed under an optimal stress state determined based on an experiment;

[0059] Step S620 , obtaining strain data of at least one position point of the workpiece to be processed during the pressurization process, and monitoring whether the workpiece to be processed is in a safe stress state based on the strain data.

[0060] In the embodiment of the present application, the pressure control system 100 controls the pressure applied to the workpiece 30 based on a target pressure change curve. The target pressure change curve is a time-varying curve corresponding to the optimal stress state of the workpiece 30, determined experimentally. Different workpiece sizes and materials correspond to different target pressure change curves. This allows the workpiece 30 to achieve an optimal stress state during the stress relief process, extending the service life of the workpiece. Furthermore, automatic and precise pressure control during the pressure relief process is achieved, enabling stress relief to be completed in a shorter time and improving stress relief efficiency. Strain data is then obtained from at least one location on the workpiece 30, as monitored by the stress monitoring system 200. The pressure control system 100 can then monitor whether the workpiece 30 is in a safe stress state based on the strain data. Specifically, when the stress value converted from the strain data is less than or equal to a stress threshold, the workpiece 30 is in a safe stress state. When the stress value converted from the strain data is greater than the stress threshold, the workpiece 30 is not in a safe stress state. That is, the stress monitoring system can be used to monitor the strain of the workpiece 30 to be processed during the pressurization process, thereby ensuring the safety and reliability of the stress treatment process.

[0061] In some embodiments, when the charging control system 100 controls the pressure change applied to the workpiece to be processed 30 based on the target pressure change curve, if the monitored strain data is greater than a preset threshold, the pressure applied to the workpiece to be processed 30 is controlled and adjusted, which can avoid crack expansion or plastic deformation of the workpiece due to local stress concentration, and significantly reduce the risk of sudden fracture.

[0062] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A stress management system, characterized in that: include: A pressure control system for controlling the pressure change applied to the workpiece to be processed based on a target pressure change curve, wherein the target pressure change curve is a curve of the pressure change over time corresponding to the optimal stress state of the workpiece to be processed determined based on pre-tests; A stress monitoring system is connected to the charging control system. The stress monitoring system is used to collect strain data of at least one position point of the workpiece to be processed during the charging process, and send the strain data to the charging control system so that the charging control system can monitor whether the workpiece to be processed is in a safe stress state based on the strain data.

2. The system according to claim 1, wherein: The charging pressure control system is further configured to control and adjust the pressure applied to the workpiece to be processed when it is detected that the strain data is greater than a preset threshold.

3. The system according to claim 2, characterized in that The pressure charging control system includes a water supply device, a connecting pipeline, a pressure sensor and a PLC control system; The water supply device is connected to the container where the workpiece to be processed is located through the connecting pipeline; A water pump and a pressure regulating valve are provided on the communication pipeline, and the pressure regulating valve and the pressure sensor are both electrically connected to the PLC control system; The pressure sensor is used to monitor the pressure corresponding to the workpiece to be processed in real time and feed back to the PLC control system; The PLC control system is used to control the opening of the pressure regulating valve to control the pressure applied to the workpiece to be processed to change according to the target pressure change curve.

4. The system according to claim 3, characterized in that The charging pressure control system further includes a water pressure buffer tank, which is connected to the communication pipeline.

5. The system according to claim 3, wherein: The charging pressure control system further includes a temperature sensor, which is electrically connected to the PLC control system and is used to collect the water temperature of the workpiece to be processed and feed the collected water temperature back to the PLC control system; Correspondingly, the PLC control system is used to control the water temperature of the injected water to be increased when it is detected that the water temperature of the workpiece to be processed is lower than the set temperature and the difference between the water temperature and the set temperature is greater than the set value.

6. The system according to claim 3, wherein: The stress monitoring system includes at least one strain gauge and at least one data collector; the strain gauge is arranged on the workpiece to be processed and is used to collect strain data at the location where the strain gauge is located. The data collector is electrically connected to the strain gauge. The data collector is also electrically connected to the PLC control system to transmit the strain data collected by the strain gauge to the PLC control system, so that the PLC control system monitors whether the workpiece to be processed is in a safe stress state based on the strain data.

7. The system according to claim 6, characterized in that When there are multiple strain gauges, the multiple strain gauges are respectively set at different positions of the workpiece to be processed to collect strain data at different positions of the workpiece to be processed; correspondingly, the data collector is a multi-channel data collector to transmit the strain data of different positions of the workpiece to be processed collected by the multiple strain gauges to the PLC control system.

8. The system according to claim 1, wherein: The system further includes an alarm system, which is electrically connected to the pressure charging control system. The pressure charging control system is further configured to control the alarm system to sound an alarm when it is detected, based on the strain data, that the workpiece to be processed is not in a safe stress state.

9. A stress treatment method, characterized in that: Executed based on the stress management system according to any one of claims 1 to 8, the method comprises: Controlling the pressure change applied to the workpiece to be processed based on a target pressure change curve, wherein the target pressure change curve is a curve of the pressure change over time corresponding to the workpiece to be processed under an optimal stress state determined based on an experiment; Strain data of at least one position point of the workpiece to be processed during the pressurization process is acquired, and whether the workpiece to be processed is in a safe stress state is monitored based on the strain data.

10. The method according to claim 9, characterized in that The method further comprises: In the process of controlling the pressure change applied to the workpiece to be processed based on the target pressure change curve, if the monitored strain data is greater than a preset threshold, the pressure applied to the workpiece to be processed is controlled and adjusted.

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