A method for controlling temperature of a new energy battery shell stamping die

Abstract

The present application relates to the technical field of sheet metal stamping forming, and provides a method for temperature control of a new energy battery shell stamping die, which comprises the following steps: deploying an experimental environment consistent with an actual working environment, uniformly coating temperature change ink on the surface of a multi-pass stamping die, performing a stamping test, acquiring color features of the temperature change ink in normal and early warning states of each region on the surface of the multi-pass stamping die through an industrial camera, and establishing a color card library; during work, uniformly coating temperature change ink on the surface of the multi-pass stamping die, deploying an industrial camera and a light source system inside a stamping machine; carrying out stamping work, acquiring images of the die surface in real time through the industrial camera and judging whether the temperature change ink is discolored, and if the temperature change ink is discolored, the early warning critical value is reached; when the early warning critical value is reached, the monitoring system outputs an early warning signal, the control system adjusts and controls the water circulation flow rate and water temperature in the multi-pass stamping die through a PID adjustment mode, and the temperature of the die surface is reduced.

Description

Technical Field

[0001] The embodiments of the present invention generally relate to the field of metal sheet stamping technology, and particularly to a method for temperature control of stamping die for new energy battery casings. Background Technology

[0002] Due to the core requirements of compact internal space and lightweight design in new energy vehicle systems, thin-walled battery casings place stringent demands on wall thickness precision, typically designed as thin-walled rectangular boxes with deep cavities. These casings, made from 3003-H14 aluminum alloy, require multiple consecutive processes including stamping, deep drawing, thinning, and trimming. They are characterized by thin material, complex processing, and high precision requirements. These factors make precise control of the forming process difficult, leading to defects such as wrinkling, cracking, and uneven wall thickness. The accumulated high temperature during stamping is a key factor affecting the stability of the casing wall thickness. After tens of thousands of stamping cycles, the surface temperature of the deep drawing die gradually accumulates with each cycle. Once it exceeds a warning threshold, the wall thickness during casing forming will fluctuate unstablely by 0.01mm-0.05mm. Therefore, accurate measurement, timely warning, and effective control of die temperature through reliable technologies have become an urgent need in the production of thin-walled battery casings for new energy vehicles.

[0003] However, in actual stamping operations, the contact time between multi-pass stamping dies and workpieces is extremely short, typically only on the order of milliseconds. This results in drastic temperature changes in the die and a highly uneven spatial distribution, making it difficult for existing technologies to establish an effective and timely die temperature measurement and control mechanism. The current industry practice is often to measure the temperature at specific points only after the die has been processed. This lagging measurement method not only ignores the real-time impact of environmental interactions on die temperature during production but also fails to fully consider measurement deviations caused by temperature dissipation. Consequently, it cannot provide timely feedback when the accumulated die temperature reaches the warning threshold, ultimately leading to quality problems in the finished parts.

[0004] Faced with the technical challenges of mold temperature measurement and control, the industry has developed two mainstream temperature measurement solutions, but both have significant limitations in the stamping scenarios of thin-walled battery casings for new energy vehicles. Contact temperature measurement technology is more widely used, its core being the embedding or fixing of thermocouple sensors inside the mold, indirectly inferring the temperature state of the entire mold surface by collecting temperature data from the installation point. However, the measurement range of thermocouples is strictly limited to the installation location, providing only single-point temperature information. In actual stamping processes, critical areas such as the die corners and punch ends experience temperature fluctuations of tens of degrees Celsius due to differences in force and friction. Measurement data from a single point or a few points cannot fully represent the overall temperature distribution of the mold, easily missing localized "overheating" or "overcooling" anomalies that directly induce product quality defects. Summary of the Invention

[0005] To address the above issues, this invention uses the color change of thermochromic ink coated on the surface of the stamping die to determine whether the surface temperature of the multi-pass deep drawing die reaches the warning threshold during the stamping process. Combined with an internal water-cooling circulation structure, it achieves effective early warning and rapid control when the surface temperature of the multi-pass stamping die is too high, thereby solving the quality problem of uneven shell wall thickness caused by temperature fluctuations and improving the stability of the stamping process and the product qualification rate.

[0006] According to an embodiment of the present invention, a method for temperature control of a stamping die for a new energy battery casing is provided.

[0007] In a first aspect of the present invention, a method for temperature control of a stamping die for a new energy battery casing is provided. The method includes: Step S01: Deploy an experimental environment consistent with the actual working environment, uniformly coat the surface of the multi-pass stamping die with thermochromic ink, conduct a stamping test, and use an industrial camera to obtain the color characteristics of the thermochromic ink in the normal and warning states of various areas on the surface of the multi-pass stamping die, and establish a color card library. Step S02: During operation, thermochromic ink is uniformly coated on the surface of the multi-pass stamping die, and an industrial camera and light source system are deployed inside the stamping machine. Step S03: Carry out stamping work, acquire images of the mold surface in real time through an industrial camera and determine whether the thermochromic ink changes color. If it changes color, the warning threshold value is reached. Step S04: When the warning threshold value is reached, the monitoring system outputs a warning signal. The intelligent control system for stamping die temperature regulates the water circulation speed and water temperature inside the multi-pass stamping die through PID adjustment to reduce the surface temperature of the die.

[0008] Furthermore, the thermochromic ink mentioned in step S01 is an irreversible thermochromic ink.

[0009] Furthermore, the surface of the multi-pass stamping die described in step S01 is divided into the inner cavity area of ​​the die cavity, the rounded corner area of ​​the die cavity, the end area of ​​the punch, and the working surface area of ​​the pressure ring, and thermochromic ink with different critical temperatures is coated in each area.

[0010] Further, the specific steps of step S03 are as follows: locate each monitoring area coated with thermochromic ink in the image, then extract the current color features of each area, and compare the extracted color features of each area with the warning status color information of the corresponding area in the color card library. If the color of the area matches the warning status color information of the corresponding area in the color card library, it is determined to be a color change.

[0011] Further, the specific steps of step S04 are as follows: the color of the thermochromic ink undergoes an irreversible change, becoming a triggered state. The monitoring system detects this change and sends an early warning trigger signal to the PLC. The PLC starts the preset emergency temperature control program and globally runs the water circulation cooling system inside the mold and the intelligent control system for the temperature of the liquid stamping mold of the entire machine. At the same time, the PID controller performs calculations based on the overall temperature control target, and its output is converted into a control signal to drive the main flow regulating valve of the intelligent control system for the stamping mold temperature, thereby controlling the overall flow of the coolant.

[0012] Furthermore, it also includes step S05: after the mold surface temperature is effectively reduced, the operator confirms that the problem has been resolved and resets the alarm on the control interface.

[0013] Furthermore, it also includes step S06: For areas that have already undergone irreversible discoloration, after resetting and before resuming production, the area should be thoroughly cleaned and recoated with the same batch of thermochromic ink in strict accordance with the specifications. Areas that have not discolored do not need to be treated and can continue to work normally.

[0014] In a second aspect of the invention, a device for temperature control of a stamping die for a new energy battery casing is provided. The device includes: Color library creation module: Used to deploy an experimental environment consistent with the actual working environment, uniformly coat the surface of the multi-pass stamping die with thermochromic ink, conduct stamping tests, and use an industrial camera to acquire the color characteristics of the thermochromic ink in the normal and warning states of various areas on the surface of the multi-pass stamping die, and create a color library. Ink coating module: Used to uniformly coat the surface of multi-pass stamping dies with thermochromic ink during operation, and to deploy industrial cameras and light source systems inside the stamping machine. Color change judgment module: Used for stamping parts, it uses an industrial camera to acquire images of the mold surface in real time and judges whether the thermochromic ink changes color. If the color changes, it reaches the warning threshold value. Cooling regulation module: When the warning threshold value is reached, the monitoring system outputs a warning signal. The intelligent control system for stamping die temperature regulates the water circulation speed and water temperature inside the multi-pass stamping die through PID regulation to reduce the surface temperature of the die.

[0015] In a third aspect of the invention, an electronic device is provided. The electronic device includes a memory and a processor, the memory storing a computer program, the processor executing the program to implement the method according to a first aspect of the invention.

[0016] In a fourth aspect of the invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the method according to a first aspect of the invention.

[0017] This invention determines whether the surface temperature of a multi-pass deep drawing die reaches a warning threshold during the stamping process by observing the color change of the thermochromic ink coated on the surface of the stamping die. Combined with an internal water-cooling circulation structure, it achieves effective early warning and rapid control when the surface temperature of the multi-pass stamping die is too high, thereby solving the quality problem of uneven shell wall thickness caused by temperature fluctuations and improving the stability of the stamping process and the product qualification rate.

[0018] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0019] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. Wherein: Figure 1 A flowchart illustrating a method for temperature control of a new energy battery casing stamping die according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of a stamping press structure according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of an intelligent temperature control system for stamping dies according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of the water circulation structure of the first punch of a stamping die according to an embodiment of the present invention is shown. Figure 5 A block diagram of a device for temperature control of a new energy battery casing stamping die according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of a device for temperature control of a new energy battery casing stamping die according to an embodiment of the present invention is shown. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] According to an embodiment of the present invention, a method for temperature control of stamping dies for new energy battery casings is proposed. By observing the color change of the thermochromic ink coated on the surface of the stamping die, it is determined whether the surface temperature of the multi-pass deep drawing die reaches the warning threshold during the stamping process. Combined with the internal water-cooling circulation structure of the die, an effective warning and rapid control can be achieved when the surface temperature of the multi-pass stamping die is too high. This solves the quality problem of uneven shell wall thickness caused by temperature fluctuations and improves the stability of the stamping process and the product qualification rate.

[0022] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0023] Figure 1 This is a schematic flowchart of a method for temperature control of a stamping die for a new energy battery casing according to an embodiment of the present invention. The method includes: Step S01: Deploy an experimental environment consistent with the actual working environment, uniformly coat the surface of the multi-pass stamping die with thermochromic ink, conduct a stamping test, and use an industrial camera to obtain the color characteristics of the thermochromic ink in the normal and warning states of various areas on the surface of the multi-pass stamping die, and establish a color card library. Step S02: During operation, thermochromic ink is uniformly coated on the surface of the multi-pass stamping die, and an industrial camera and light source system are deployed inside the stamping machine. Step S03: Carry out stamping work, acquire images of the mold surface in real time through an industrial camera and determine whether the thermochromic ink changes color. If it changes color, the warning threshold value is reached. Step S04: When the warning threshold value is reached, the monitoring system outputs a warning signal. The intelligent control system for stamping die temperature regulates the water circulation speed and water temperature inside the multi-pass stamping die through PID adjustment to reduce the surface temperature of the die.

[0024] It should be noted that although the operation of the method of the present invention has been described in a specific order in the above embodiments and figures, this does not require or imply that the operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0025] To provide a clearer explanation of the above-mentioned method for temperature control of stamping dies for new energy battery casings, a specific embodiment will be used for illustration below. However, it is worth noting that this embodiment is only for better illustrating the present invention and does not constitute an improper limitation of the present invention.

[0026] The following specific example will further illustrate the method of temperature control for stamping dies of new energy battery casings: Step S01: Deploy an experimental environment consistent with the actual working environment, uniformly coat the surface of the multi-pass stamping die with thermochromic ink, conduct a stamping test, and use an industrial camera to acquire the color characteristics of the thermochromic ink in the normal and warning states of various areas on the surface of the multi-pass stamping die, and establish a color card library.

[0027] Specifically, temperature-controlled ink is applied by brushing onto key structural surfaces such as the inner cavity of the die cavity, the rounded corners of the die cavity, the end of the punch, and the working surface of the pressure ring in multi-pass stamping dies to ensure the formation of a uniform and firmly adhered coating.

[0028] The selected temperature-sensitive ink is a special coating sourced from the existing market. Its color undergoes irreversible and specific changes with temperature. Before use, in a laboratory environment identical to the working environment, the batch of ink underwent precise temperature and color calibration for each key structural surface area on the mold that required monitoring, forming a regional color chart library. The calibration process simulated the actual geometric position, surface characteristics, and expected lighting conditions of the area on the mold, ensuring that the color chart library recorded the true color characteristics of each specific location under normal and warning conditions.

[0029] Because different batches of thermochromic inks have different formulations, their color-changing characteristics may vary, and light exposure directly affects the color development reaction. Therefore, it is essential to ensure that the same batch of ink is used for color chart collection and actual work, and that environmental conditions are kept consistent.

[0030] Specifically, in order to achieve graded monitoring and accurate alarm for different heat-sensitive areas of the mold, thermochromic inks with different critical temperatures can be selected and coated for different areas based on the thermal load characteristics, process safety requirements, and tolerance to overheating of the key structural surface areas.

[0031] Before being put into use, in a laboratory environment identical to the working environment, precise temperature-color calibration was performed on each monitoring area on the mold coated with thermochromic ink, based on the specific critical temperature (Tc) of the ink applied to that area, forming a graded color card library with regions associated with specific Tc. The calibration process needs to simulate the actual geometric position, surface characteristics, and expected lighting conditions of the area on the mold, and in particular, accurately calibrate the warning state color characteristics of the ink used in that area at its specified Tc.

[0032] In this embodiment, a thermochromic ink that changes color at 120 degrees Celsius is applied to the inner cavity of the die, a thermochromic ink that changes color at 180 degrees Celsius is applied to the rounded corners of the die, a thermochromic ink that changes color at 150 degrees Celsius is applied to the end of the punch, and a thermochromic ink that changes color at 100 degrees Celsius is applied to the working surface of the pressure ring.

[0033] In a laboratory environment identical to the working environment, each area of ​​the mold is heated by a heating platform. In conjunction with a high-precision thermocouple and a high-definition image acquisition system, color features are extracted to establish a color card library for each area in normal and warning states.

[0034] Step S02: During operation, thermochromic ink is uniformly coated on the surface of the multi-pass stamping die, and an industrial camera and light source system are deployed inside the stamping machine.

[0035] For the mold area coated with thermochromic ink, a high-speed, high-resolution industrial camera and a matching, stable and reliable light source system are deployed. The camera is vibration-resistant and adaptable to the workshop environment, and the light source system ensures that the lighting conditions on the mold surface are consistent in any stamping cycle to avoid interference from ambient light on color recognition.

[0036] In this embodiment, an industrial camera and light source system are installed according to the set requirements and then linked with the stamping machine control system after debugging.

[0037] Step S03: Carry out the stamping work, acquire images of the mold surface in real time through an industrial camera and determine whether the thermochromic ink changes color. If it changes color, the warning threshold value is reached.

[0038] The industrial camera is linked with the stamping press control system to instantly trigger and capture high-definition images of the die surface at key process moments such as before the upper die contacts the sheet metal, at the end of the pressure holding process, and after the upper die returns, or at a set high frequency. The captured images are transmitted in real time to the stamping die temperature control software system.

[0039] The system first locates each monitoring area coated with thermochromic ink in the image, then extracts the current color features of each area, and compares the extracted color features of each area with the corresponding warning status color information in the color card library.

[0040] Because thermochromic inks have irreversible color-changing properties, once the ink color characteristic of a certain monitoring area reaches or exceeds its corresponding warning color mark, it indicates that the temperature of that area has reached or exceeded the process safety warning threshold, and the ink at that point permanently changes to the triggered state. When the system detects the above match in any monitoring area, it determines that there is a risk of local overheating in the current mold and immediately sends a warning trigger signal to the PLC.

[0041] In this embodiment, an industrial camera captures images of the mold surface in real time and transmits them to the control software. After 5,000 pieces are produced continuously, the temperature in the rounded corner area of ​​the die accumulates to the warning temperature of 180°C, and the thermochromic ink changes from white to black.

[0042] Step S04: When the warning threshold value is reached, the monitoring system outputs a warning signal. The intelligent control system for stamping die temperature regulates the water circulation speed and water temperature inside the multi-pass stamping die through PID adjustment to reduce the surface temperature of the die.

[0043] Specifically, such as Figure 2 As shown, the intelligent control system for the overall liquid stamping die temperature of the multi-pass stamping press adopts PID regulation. When the surface temperature of the current stamping die does not reach the warning threshold value for process safety, the monitoring system does not output a warning signal, and the intelligent control system for stamping die temperature is in standby or low-power operation state, only used to maintain the basic temperature.

[0044] When continuous production causes the mold temperature to accumulate and reach the ink's color-changing temperature, the ink color undergoes an irreversible change, entering a triggered state. The monitoring system detects this change and sends an early warning trigger signal to the PLC. The PLC then activates the preset emergency temperature control program, globally operating the internal water circulation cooling of the mold and the overall intelligent temperature control system for the liquid stamping mold of the machine. Figure 3 As shown. Simultaneously, the PID controller performs calculations based on the overall temperature control target, and its output is converted into a control signal to drive the main flow regulating valve of the intelligent temperature control system for stamping dies, precisely controlling the overall flow rate of the coolant to achieve rapid and efficient global cooling.

[0045] like Figure 4 The diagram shows the water circulation structure for the first pass of a stamping die. The intelligent temperature control system for the stamping die operates continuously at high intensity until the die temperature is effectively reduced. After the operator confirms that the problem has been resolved, the alarm can be reset on the control interface. The reset operation will clear the system's warning status signal and allow the exit of the emergency temperature control program.

[0046] For areas where irreversible discoloration has occurred, the warning function is permanently disabled in that area. If temperature monitoring needs to continue in that specific area, the discolored area must be thoroughly cleaned after resetting and before resuming production, and the same batch of thermochromic ink must be recoated strictly according to specifications. After recoating, it must be ensured that the image of the newly coated area is correctly identified and located by the system. Monitoring areas that have not discolored can continue to operate normally without any treatment.

[0047] In this embodiment, after the control software identifies the warning color, it sends a signal to the PLC to initiate the emergency cooling program. The PID controller adjusts the proportional control valve to 90% opening, increasing the coolant flow rate to 25L / min. After 5 minutes of cooling, the temperature of the rounded corner area of ​​the mold cavity drops to 120℃. The operator resets the alarm, thoroughly cleans the discolored spot, recoats and cures it according to the original process, and resumes production.

[0048] After implementation and testing, the solution's early warning response time is 3 seconds, the intelligent temperature control system for stamping dies achieves a cooling efficiency of 12℃ / minute, the coating still maintains good adhesion after continuous production of 6000 pieces, and the product scrap rate is reduced from 8% to 0.5%, meeting the temperature control requirements of multi-pass stamping dies.

[0049] The aforementioned temperature measurement method for thermochromic ink is a prerequisite and data foundation for the efficient and accurate operation of the entire temperature control system. Unlike single-point measurements such as thermocouples, the temperature measurement method for thermochromic ink can obtain the temperature distribution of a region, avoiding the response lag caused by contact measurement. It can capture instantaneous temperature changes and instantaneous temperature warnings caused by plastic work conversion and frictional heat generation during the stamping process.

[0050] Based on the same inventive concept, this invention also proposes a device for temperature control of stamping dies for new energy battery casings. The implementation of this device can be found in the implementation of the method described above; repeated details will not be repeated. Figure 5 As shown, the device 100 includes: Color library establishment module 101: Used to deploy an experimental environment consistent with the actual working environment, uniformly coat the surface of the multi-pass stamping die with thermochromic ink, conduct stamping tests, and use an industrial camera to acquire the color characteristics of the thermochromic ink in the normal and warning states of various areas on the surface of the multi-pass stamping die, and establish a color library. Ink Coating Module 012: Used to uniformly coat the surface of multi-pass stamping dies with thermochromic ink during operation, and to deploy an industrial camera and light source system inside the stamping machine. Color change judgment module 103: Used to carry out stamping work, it uses an industrial camera to acquire images of the mold surface in real time and judges whether the thermochromic ink changes color. If the color changes, it reaches the warning critical value. Cooling regulation module 104: When the warning threshold value is reached, the monitoring system outputs a warning signal. The intelligent control system for stamping die temperature regulates the water circulation speed and water temperature inside the multi-pass stamping die through PID regulation to reduce the surface temperature of the die.

[0051] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the described module can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0052] like Figure 6 As shown, the device includes a central processing unit (CPU), which can perform various appropriate actions and processes based on computer program instructions stored in read-only memory (ROM) or loaded from storage units into random access memory (RAM). The RAM can also store various programs and data required for device operation. The CPU, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0053] Multiple components in the device are connected to the I / O interface, including: input units such as keyboards and mice; output units such as various types of displays and speakers; storage units such as disks and optical discs; and communication units such as network interface cards (NICs), modems, and wireless transceivers. The communication unit allows the device to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0054] The processing unit executes the various methods and processes described above, such as method steps S01 to S04. For example, in some embodiments, method steps S01 to S04 may be implemented as a computer software program tangibly contained in a machine-readable medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and / or installed on the device via ROM and / or a communication unit. When the computer program is loaded into RAM and executed by the CPU, one or more steps of method steps S01 to S04 described above may be performed. Alternatively, in other embodiments, the CPU may be configured to execute method steps S01 to S04 by any other suitable means (e.g., by means of firmware).

[0055] The functions described above in this document can be performed at least in part by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: field programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload programmable logic devices (CPLDs), and so on.

[0056] The program code used to implement the methods of the present invention can be written in any combination of one or more programming languages. This program code can be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing device, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code can be executed entirely on the machine, partially on the machine, as a standalone software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0057] In the context of this invention, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0058] Furthermore, although the operations are described in a specific order, this should be understood as requiring that such operations be performed in the specific order shown or in sequential order, or requiring that all illustrated operations be performed to achieve the desired result. In certain environments, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

[0059] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A method for temperature control of a stamping die for a new energy battery casing, characterized in that, The method includes: Step S01: Deploy an experimental environment consistent with the actual working environment, uniformly coat the surface of the multi-pass stamping die with irreversible thermochromic ink, conduct a stamping test, and use an industrial camera to obtain the color characteristics of the thermochromic ink in the normal and warning states of various areas on the surface of the multi-pass stamping die, and establish a color card library. Step S02: During operation, thermochromic ink is uniformly coated on the surface of the multi-pass stamping die, and an industrial camera and light source system are deployed inside the stamping machine. Step S03: Carry out stamping work. Use an industrial camera to acquire images of the mold surface in real time and determine whether the thermochromic ink has changed color. If it has changed color, the warning threshold value is reached. The specific steps are as follows: locate each monitoring area coated with thermochromic ink in the image, then extract the current color features of each area, and match and compare the extracted color features of each area with the warning status color information of the corresponding area in the color card library. If the color of the area matches the warning status color information of the corresponding area in the color card library, it is determined to be a color change. Step S04: When the warning threshold value is reached, the monitoring system outputs a warning signal. The intelligent control system for stamping die temperature regulates the internal water circulation speed and water temperature of the multi-pass stamping die through PID control to reduce the surface temperature of the die. Specifically, the color of the thermochromic ink undergoes an irreversible change, becoming a triggered state. The monitoring system detects this change and sends a warning trigger signal to the PLC. The PLC starts the preset emergency temperature control program, globally running the internal water circulation cooling of the die and the overall intelligent control system for liquid stamping die temperature. At the same time, the PID controller performs calculations based on the overall temperature control target, and its output is converted into a control signal to drive the main flow regulating valve of the intelligent control system for stamping die temperature, controlling the overall flow of coolant.

2. The method for temperature control of a new energy battery casing stamping die according to claim 1, characterized in that, The surface of the multi-pass stamping die described in step S01 is divided into the inner cavity area of ​​the die cavity, the rounded corner area of ​​the die cavity, the end area of ​​the punch, and the working surface area of ​​the pressure ring. Each area is coated with a thermochromic ink with a different critical temperature.

3. The method for temperature control of a new energy battery casing stamping die according to claim 1, characterized in that, It also includes step S05: after the mold surface temperature is effectively reduced, the operator confirms that the problem has been resolved and resets the alarm on the control interface.

4. The method for temperature control of a new energy battery casing stamping die according to claim 1, characterized in that, It also includes step S06: For areas that have undergone irreversible discoloration, after resetting and before resuming production, the area should be thoroughly cleaned and recoated with the same batch of thermochromic ink in strict accordance with the specifications. Areas that have not discolored do not need to be treated and can continue to work normally.

5. A device for temperature control of a stamping die for a new energy battery casing, characterized in that, The device implements the method as described in any one of claims 1 to 4, comprising: Color library creation module: Used to deploy an experimental environment consistent with the actual working environment, uniformly coat the surface of the multi-pass stamping die with irreversible thermochromic ink, conduct stamping tests, and use an industrial camera to acquire the color characteristics of the thermochromic ink in the normal and warning states of various areas on the surface of the multi-pass stamping die, and create a color library. Ink coating module: Used to uniformly coat the surface of multi-pass stamping dies with thermochromic ink during operation, and to deploy industrial cameras and light source systems inside the stamping machine. Color Change Detection Module: Used for stamping parts. It uses an industrial camera to acquire images of the mold surface in real time and determines whether the thermochromic ink has changed color. If the color changes, the warning threshold value is reached. The specific steps are as follows: locate each monitoring area coated with thermochromic ink in the image, then extract the current color features of each area, and match the extracted color features of each area with the warning status color information of the corresponding area in the color card library. If the color of the area matches the warning status color information of the corresponding area in the color card library, it is determined to be a color change. Cooling regulation module: When the warning threshold value is reached, the monitoring system outputs a warning signal. The intelligent temperature control system for stamping dies regulates the internal water circulation speed and water temperature of the multi-pass stamping die through PID control to reduce the surface temperature of the die. The specific steps are as follows: When the color of the thermochromic ink undergoes an irreversible change and becomes a triggered state, the monitoring system detects this change and sends a warning trigger signal to the PLC. The PLC starts the preset emergency temperature control program, globally running the internal water circulation cooling of the die and the overall liquid stamping die temperature intelligent control system of the machine. At the same time, the PID controller performs calculations based on the overall temperature control target, and its output is converted into a control signal to drive the main flow regulating valve of the intelligent temperature control system for stamping dies, controlling the overall flow of coolant.

6. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1 to 4.

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