Quick-acting mold cooling control system and method thereof

Abstract

The invention provides a quick-acting mold cooling control system and method. The system comprises a cooling control middle table, an equipment control module, a circulation starting module, a device starting module, a flow speed control module and an operation control module. The equipment control module controls a cooling channel of the mold to be connected with an external cooling liquid supply system; the circulation starting module starts cooling liquid circulation; the device starting module starts the ultrasonic vibration device; when the flow velocity control module monitors that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to generate phase change, and the flow velocity of the cooling liquid in the cooling channel is adjusted based on the real-time cooling condition of the mold after phase change of the phase change material; and when the temperature of the mold is reduced to the target temperature, the operation control module stops the operation of the ultrasonic vibration device and closes the external cooling liquid supply system, so that quick-acting cooling of the mold is realized. According to the invention, the cooling uniformity of the mold can be obviously improved, the problem of thermal stress concentration is reduced, and the service life of the mold is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of computers, and in particular to a mould quick-acting temperature reduction control system and method thereof. Background Art

[0002] In the field of mold manufacturing and molding processing, mold temperature control plays a vital role in product quality, production efficiency and mold service life. Existing mold quick cooling control methods usually adopt traditional methods such as water cooling or air cooling. Taking water cooling as an example, it mainly sets a cooling channel inside the mold to circulate the coolant to take away the heat. However, the cooling uniformity of the traditional cooling control method is poor. Due to the uneven flow path and speed distribution of the coolant in the cooling channel, the degree of heat exchange between different parts of the mold and the coolant is different, resulting in inconsistent cooling speeds of various parts of the mold. Therefore, it is easy to generate a large temperature gradient inside the mold, which in turn causes thermal stress concentration. Thermal stress concentration can cause the mold to deform, reduce the precision of the mold, and affect the dimensional accuracy and surface quality of the molded product. In addition, long-term thermal stress will accelerate the fatigue damage of the mold and shorten the service life of the mold. Summary of the invention

[0003] The present invention provides a mold quick-acting temperature reduction control system and method thereof, aiming to significantly improve the uniformity of mold cooling, reduce the problem of thermal stress concentration, and increase the service life of the mold.

[0004] In the first aspect, the present invention provides a mold quick-acting cooling control system, wherein a phase change material chamber is provided inside the mold, and the phase change material chamber is filled with a phase change material; a plurality of ultrasonic vibration devices are evenly arranged on the outer surface of the mold; the mold quick-acting cooling control system comprises a cooling control center, an equipment control module, a cycle start module, a device start module, a flow rate control module and an operation control module; the cooling control center is respectively connected to the equipment control module, the cycle start module, the device start module, the flow rate control module and the operation control module to manage each module;

[0005] An equipment control module, used for controlling the cooling channel of the mold to be connected to an external coolant supply system;

[0006] A circulation start module, used to start the coolant circulation, so as to control the coolant in the external coolant supply system to circulate in the cooling channel;

[0007] A device starting module, used to start the ultrasonic vibration device after the coolant circulation starts for a preset time, so as to control the coolant to form turbulent flow in the cooling channel based on the ultrasonic vibration device;

[0008] A flow rate control module, for controlling the phase change material to undergo phase change when the temperature of the mold reaches the phase change temperature of the phase change material, and adjusting the flow rate of the coolant in the cooling channel based on the real-time cooling of the mold after the phase change material undergoes phase change;

[0009] The operation control module is used to stop the operation of the ultrasonic vibration device and close the external coolant supply system when the temperature of the mold drops to the target temperature, so as to achieve rapid cooling of the mold.

[0010] In a second aspect, the present invention further provides a mold quick-acting cooling control method, which is implemented based on the mold quick-acting cooling control system described in the first aspect, wherein a phase change material chamber is provided inside the mold, and the interior of the phase change material chamber is filled with a phase change material; a plurality of ultrasonic vibration devices are evenly arranged on the outer surface of the mold; and the method comprises:

[0011] Controlling the cooling channel of the mold to be connected to an external coolant supply system;

[0012] Starting the coolant circulation to control the coolant in the external coolant supply system to circulate in the cooling channel;

[0013] After the coolant circulation starts for a preset time, the ultrasonic vibration device is started to control the coolant to form turbulent flow in the cooling channel based on the ultrasonic vibration device;

[0014] When it is monitored that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to undergo a phase change, and the flow rate of the coolant in the cooling channel is adjusted based on the real-time temperature drop of the mold after the phase change material undergoes a phase change;

[0015] When the temperature of the mold drops to the target temperature, the operation of the ultrasonic vibration device is stopped, and the external coolant supply system is closed to achieve rapid cooling of the mold.

[0016] In a third aspect, the present invention further provides an electronic device, comprising: a memory for storing a computer software program; a processor for reading and executing the computer software program, thereby implementing any of the above-mentioned rapid cooling control methods for molds.

[0017] In a fourth aspect, the present invention further provides a non-transitory computer-readable storage medium, wherein the storage medium stores a computer software program, and when the computer software program is executed by a processor, the mold rapid cooling control method as described above is implemented.

[0018] In a fifth aspect, the present invention provides a computer program product, including a computer program, which implements any of the above-mentioned mold rapid cooling control methods when executed by a processor.

[0019] The mold quick-acting cooling control system provided by the embodiment of the present invention is filled with phase change material in the phase change material chamber inside the mold. When the phase change material reaches the phase change temperature, it will absorb a large amount of latent heat. Since the phase change material is filled in the preset chamber inside the mold, it can play a role evenly in various parts of the mold. Therefore, when the temperature of some parts of the mold is high, the phase change material preferentially undergoes phase change in these parts to absorb heat, so that the temperature of the part is quickly reduced, narrowing the temperature gap with other parts. In this way, during the entire cooling process, the temperature of various parts of the mold can be reduced more evenly, effectively avoiding the generation of temperature gradients, thereby reducing the problem of thermal stress concentration. On the other hand, the ultrasonic vibration device causes the coolant to form turbulence in the cooling channel. Turbulence can destroy the boundary layer between the coolant and the mold wall and enhance the heat exchange between the coolant and the mold wall. The coolant can contact various parts of the mold more evenly, take away heat, reduce the difference in cooling speed between different parts, and improve the uniformity of mold cooling. Therefore, the embodiment of the present invention can significantly improve the uniformity of mold cooling through the synergistic effect of ultrasonic vibration and phase change material, reduce the problem of thermal stress concentration, and improve the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the mold quick-acting temperature reduction control system provided by the present invention;

[0021] Figure 2 It is a schematic flow chart of the mold quick-acting temperature reduction control method provided by the present invention;

[0022] Figure 3 An embodiment diagram of an electronic device provided by an embodiment of the present invention;

[0023] Figure 4 An embodiment diagram of a computer-readable storage medium provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, the term "for example" is used to mean "used as an example, illustration or explanation". Any embodiment described as "for example" in the present invention is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present invention.

[0027] Optional, see Figure 1 As shown, Figure 1 It is a structural schematic diagram of the mold quick-acting temperature reduction control system provided by the present invention. In the embodiment of the present invention, there is a phase change material chamber inside the mold, and the interior of the phase change material chamber is filled with phase change material, and the phase change material is tightly filled without gaps. Multiple ultrasonic vibration devices are evenly arranged on the outer surface of the mold, so that the ultrasonic wave can be evenly propagated to various areas inside the mold.

[0028] Optionally, the mold quick-acting cooling control system includes a cooling control center, an equipment control module, a cycle start module, a device start module, a flow rate control module and an operation control module, wherein the cooling control center is respectively connected to the equipment control module, the cycle start module, the device start module, the flow rate control module and the operation control module to manage each module.

[0029] Optionally, the equipment control module needs to control the physical connection between the cooling channel of the mold and the external coolant supply system to ensure that the coolant can flow smoothly into the cooling channel of the mold. During the connection process, it is necessary to ensure good sealing to prevent coolant leakage. For example, after the cooling channel of the mold is connected to the external coolant supply system, the entire connection part is pressure tested, and a pressure pump is used to inject air at a certain pressure into the pipeline to observe whether bubbles are generated at the connection part to check the sealing.

[0030] Optionally, the circulation start module starts the coolant circulation and controls the coolant in the external coolant supply system to circulate in the cooling channel.

[0031] If the process requires starting the coolant pump in the coolant supply system, set the operating parameters such as the pump speed and shaft power of the coolant pump according to the required flow rate of the coolant to ensure that the coolant can circulate in the cooling channel at the expected flow rate, thereby taking away the heat of the mold and cooling the mold. In one embodiment, in the automotive parts injection mold scenario, the coolant supply system uses a centrifugal pump with a pump speed of 1500 rpm, and the corresponding coolant flow rate is 50 liters / minute. After starting the centrifugal pump, the coolant is drawn from the reservoir of the coolant supply system, flows into the cooling channel of the mold through the pipeline, and then flows back to the reservoir from the outlet of the cooling channel, completing a cycle and continuously taking out the heat of the mold.

[0032] Optionally, the device startup module starts the ultrasonic vibration device evenly arranged on the outer surface of the mold after the coolant circulation starts for a preset time, such as 30 minutes. The high-frequency vibration emitted by the ultrasonic vibration device is transmitted to the mold, thereby affecting the coolant in the cooling channel, causing the coolant to form turbulence. Turbulence can increase the contact area and heat transfer efficiency between the coolant and the inner wall of the mold, and accelerate the cooling rate of the mold. The setting of the preset time needs to be determined comprehensively based on factors such as the material and size of the mold and the initial temperature of the coolant to ensure that the coolant is in a suitable working condition when turbulence is formed. In one embodiment, for the automotive parts injection mold, the preset time is set to 10 minutes. After the coolant circulates for 10 minutes, the system starts the ultrasonic vibration device. The operating frequency of the ultrasonic vibration device is 20kHz and the power is 500W. After startup, the high-frequency vibration generated by the vibration device causes a small high-frequency vibration on the mold surface. This vibration is transmitted to the coolant in the cooling channel, causing the coolant's originally relatively stable laminar state to be transformed into turbulence. The coolant rolls and flows in the cooling channel, greatly enhancing the heat exchange efficiency with the inner wall of the mold.

[0033] Optionally, the flow rate control module monitors the temperature of the mold in real time through a temperature sensor. When it is detected that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to undergo a phase change. The phase change material absorbs a large amount of heat during the phase change process, further accelerating the cooling speed of the mold. At the same time, according to the real-time cooling of the mold after the phase change material undergoes a phase change, the flow rate of the coolant in the cooling channel is adjusted by adjusting the speed of the pump in the coolant supply system, etc., so as to achieve precise control of the mold cooling process and ensure that the mold can be cooled evenly and quickly.

[0034] In one embodiment, the phase change material in the mold is paraffin, and its phase change temperature is 50°C. When the temperature sensor detects that the mold temperature reaches 50°C, the control system sends a signal to start the heating element to slightly heat the phase change material chamber (because paraffin may need a certain amount of excitation to start phase change under natural conditions), prompting the paraffin to start changing from solid to liquid and absorb a large amount of heat. At the same time, the temperature sensor continuously monitors the real-time cooling of the mold. If it is found that the mold cools down too fast, it may cause uneven stress inside the mold. The control system reduces the speed of the pump in the coolant supply system from 1500 rpm to 1200 rpm, reducing the flow of coolant and thus reducing the cooling speed; if the cooling speed is too slow, the pump speed is increased to 1800 rpm, increasing the flow of coolant and speeding up the cooling speed.

[0035] Optionally, when the temperature of the mold drops to the target temperature, the operation control module stops the operation of the ultrasonic vibration device to avoid unnecessary energy consumption and possible excessive vibration effects on the mold. At the same time, the external coolant supply system is turned off to stop the circulation of the coolant, and the entire mold rapid cooling process is completed. At this point, the mold has reached a suitable temperature state, and subsequent production operations or maintenance work can be carried out. In one embodiment, the target temperature of the automotive parts injection mold is 30°C. When the temperature sensor detects that the mold temperature drops to 30°C, the operation of the ultrasonic vibration device is first stopped, and then the centrifugal pump in the coolant supply system is turned off, and the valve on the coolant circulation pipeline is closed. At this point, the mold has completed the rapid cooling process, and the next cycle of injection molding production can be carried out, or the mold maintenance work can be carried out, such as cleaning impurities in the cooling channel.

[0036] In the embodiment of the present invention, the phase change material cavity inside the mold is filled with a phase change material. When the phase change material reaches the phase change temperature, it absorbs a large amount of latent heat. Since the phase change material is filled in the preset cavity inside the mold, it can play a role evenly in various parts of the mold. Therefore, when the temperature of some parts of the mold is high, the phase change material preferentially undergoes phase change in these parts to absorb heat, so that the temperature of the parts is rapidly reduced, narrowing the temperature gap with other parts. During the entire cooling process, the temperature of various parts of the mold can be reduced more evenly, effectively avoiding the generation of temperature gradients, thereby reducing the problem of thermal stress concentration. On the other hand, the ultrasonic vibration device causes the coolant to form turbulence in the cooling channel. Turbulence can destroy the boundary layer between the coolant and the mold wall and enhance the heat exchange between the coolant and the mold wall. The coolant can contact various parts of the mold more evenly, take away heat, reduce the difference in cooling speed between different parts, and improve the uniformity of mold cooling. Therefore, through the synergistic effect of ultrasonic vibration and phase change material, the uniformity of mold cooling can be significantly improved, the problem of thermal stress concentration is reduced, and the service life of the mold is improved.

[0037] Optional, see Figure 2 , Figure 2 It is a flow chart of the mold quick-acting temperature reduction control method provided by the present invention. In the embodiment of the present invention, there is a phase change material chamber inside the mold, and the interior of the phase change material chamber is filled with phase change material, and the phase change material is tightly filled without gaps. Multiple ultrasonic vibration devices are evenly arranged on the outer surface of the mold, so that the ultrasonic wave can be evenly propagated to various areas inside the mold.

[0038] The execution subject of the mold quick-acting temperature reduction control method in the embodiment of the present invention is a temperature reduction control system. Therefore, the mold quick-acting temperature reduction control method includes:

[0039] Step 10, controlling the cooling channel of the mold to be connected to an external coolant supply system.

[0040] Optionally, the temperature control system needs to control the physical connection between the cooling channel of the mold and the external coolant supply system to ensure that the coolant can flow smoothly into the cooling channel of the mold. During the connection process, it is necessary to ensure good sealing to prevent coolant leakage. For example, after the cooling channel of the mold is connected to the external coolant supply system, the entire connection part is pressure tested, and a pressure pump is used to inject air at a certain pressure into the pipeline to observe whether there are bubbles in the connection part to check the sealing.

[0041] Step 20, starting the coolant circulation to control the coolant in the external coolant supply system to circulate in the cooling channel.

[0042] Further, the temperature reduction control system starts the coolant circulation system so that the coolant in the external coolant supply system starts to circulate in the cooling channel of the mold, as described in steps 201 to 205. For example, if the process needs to start the coolant pump in the coolant supply system, the pump speed and shaft power of the coolant pump are set according to the required flow rate of the coolant to ensure that the coolant can circulate in the cooling channel at the expected flow rate, thereby taking away the heat of the mold and achieving mold cooling. In one embodiment, in the automotive parts injection mold scenario, the coolant supply system uses a centrifugal pump with a pump speed of 1500 rpm, and the corresponding coolant flow rate is 50 liters / minute. After starting the centrifugal pump, the coolant is drawn from the liquid storage tank of the coolant supply system, flows into the cooling channel of the mold through the pipeline, and then flows back to the liquid storage tank from the outlet of the cooling channel, completing a cycle, and continuously taking out the heat of the mold.

[0043] Step 30, after the coolant circulation starts for a preset time, the ultrasonic vibration device is started to control the coolant to form turbulence in the cooling channel based on the ultrasonic vibration device.

[0044] Furthermore, after the coolant circulates for a preset time, such as 30 minutes, the temperature reduction control system starts the ultrasonic vibration device evenly arranged on the outer surface of the mold according to the actual setting. The high-frequency vibration emitted by the ultrasonic vibration device is transmitted to the mold, thereby affecting the coolant in the cooling channel, causing the coolant to form turbulence, as described in steps 301 to 303. Turbulence can increase the contact area and heat transfer efficiency between the coolant and the inner wall of the mold, and accelerate the cooling rate of the mold. The setting of the preset time needs to be determined comprehensively based on factors such as the material and size of the mold and the initial temperature of the coolant to ensure that the coolant is in a suitable working condition when turbulence is formed. In one embodiment, for the automotive parts injection mold, the preset time is set to 10 minutes. After the coolant circulates for 10 minutes, the system starts the ultrasonic vibration device. The operating frequency of the ultrasonic vibration device is 20kHz and the power is 500W. After startup, the high-frequency vibration generated by the vibration device causes tiny high-frequency vibrations on the mold surface. This vibration is transmitted to the coolant in the cooling channel, causing the coolant's originally relatively stable laminar flow state to change into turbulent flow. The coolant tumbles and flows in the cooling channel, greatly enhancing the heat exchange efficiency with the inner wall of the mold.

[0045] Step 40, when it is monitored that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to undergo phase change, and the flow rate of the coolant in the cooling channel is adjusted based on the real-time cooling of the mold after the phase change material undergoes phase change.

[0046] Furthermore, the temperature control system monitors the temperature of the mold in real time through a temperature sensor. When it is detected that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to undergo a phase change. The phase change material absorbs a large amount of heat during the phase change process, further accelerating the cooling speed of the mold. At the same time, according to the real-time cooling of the mold after the phase change material undergoes a phase change, the flow rate of the coolant in the cooling channel is adjusted by adjusting the speed of the pump in the coolant supply system, etc., so as to achieve precise control of the mold cooling process and ensure that the mold can be cooled evenly and quickly.

[0047] In one embodiment, the phase change material in the mold is paraffin, and its phase change temperature is 50°C. When the temperature sensor detects that the mold temperature reaches 50°C, the control system sends a signal to start the heating element to slightly heat the phase change material chamber (because paraffin may need a certain amount of excitation to start phase change under natural conditions), prompting the paraffin to start changing from solid to liquid and absorb a large amount of heat. At the same time, the temperature sensor continuously monitors the real-time cooling of the mold. If it is found that the mold cools down too fast, it may cause uneven stress inside the mold. The control system reduces the speed of the pump in the coolant supply system from 1500 rpm to 1200 rpm, reducing the flow of coolant and thus reducing the cooling speed; if the cooling speed is too slow, the pump speed is increased to 1800 rpm, increasing the flow of coolant and speeding up the cooling speed.

[0048] Step 50, when the temperature of the mold drops to the target temperature, the operation of the ultrasonic vibration device is stopped, and the external coolant supply system is closed to achieve rapid cooling of the mold.

[0049] Furthermore, when the temperature of the mold drops to the target temperature, the temperature reduction control system stops the operation of the ultrasonic vibration device to avoid unnecessary energy consumption and possible excessive vibration effects on the mold. At the same time, the external coolant supply system is turned off to stop the circulation of the coolant, and the entire mold rapid cooling process is completed. At this point, the mold has reached a suitable temperature state, and subsequent production operations or maintenance work can be carried out. In one embodiment, the target temperature of the automotive parts injection mold is 30°C. When the temperature sensor detects that the mold temperature drops to 30°C, the operation of the ultrasonic vibration device is first stopped, and then the centrifugal pump in the coolant supply system is turned off, and the valve on the coolant circulation pipeline is closed. At this point, the mold has completed the rapid cooling process, and the next cycle of injection molding production can be carried out, or the mold maintenance work can be carried out, such as cleaning impurities in the cooling channel.

[0050] In the embodiment of the present invention, the phase change material cavity inside the mold is filled with a phase change material. When the phase change material reaches the phase change temperature, it absorbs a large amount of latent heat. Since the phase change material is filled in the preset cavity inside the mold, it can play a role evenly in various parts of the mold. Therefore, when the temperature of some parts of the mold is high, the phase change material preferentially undergoes phase change in these parts to absorb heat, so that the temperature of the parts is rapidly reduced, narrowing the temperature gap with other parts. During the entire cooling process, the temperature of various parts of the mold can be reduced more evenly, effectively avoiding the generation of temperature gradients, thereby reducing the problem of thermal stress concentration. On the other hand, the ultrasonic vibration device causes the coolant to form turbulence in the cooling channel. Turbulence can destroy the boundary layer between the coolant and the mold wall and enhance the heat exchange between the coolant and the mold wall. The coolant can contact various parts of the mold more evenly, take away heat, reduce the difference in cooling speed between different parts, and improve the uniformity of mold cooling. Therefore, through the synergistic effect of ultrasonic vibration and phase change material, the uniformity of mold cooling can be significantly improved, the problem of thermal stress concentration is reduced, and the service life of the mold is improved.

[0051] In one embodiment, the description of steps 201 to 205 is as follows:

[0052] Step 201 : construct a cooling cycle planning loop path based on the branching of the cooling channel and the cooling requirements of the heat load distribution at different parts of the mold.

[0053] Optionally, the cooling control system conducts a comprehensive survey of the cooling channel branches of the mold, and clarifies the direction, connection method and position distribution of each branch in the mold. At the same time, the heat load distribution of different parts of the mold during the production process is analyzed, and the areas with high heat load have more urgent cooling needs. Based on this information, multiple cooling circulation paths are planned, and these paths should form a closed loop to ensure that the coolant can circulate in it and cover all parts of the mold that need to be cooled. In one embodiment, in an injection mold for automotive parts, the cavity part of the mold has a high heat load due to direct contact with the high-temperature plastic melt, while the heat load of the edge part of the mold is relatively low. The cooling channel has multiple branches, extending from the main pipeline at the bottom of the mold to various parts. According to the actual structure of the mold and the distribution of heat load, three cooling circulation planning loop paths are planned. Path one surrounds the core area of ​​the cavity, path two covers the periphery of the cavity and part of the edge area, and path three is mainly for the edge part of the mold. These paths form a closed loop through reasonable connection and steering to ensure that the coolant can circulate in it.

[0054] Step 202 , traverse the cooling cycle planning loop path with the goal of allowing the coolant to flow evenly through various parts of the mold, and determine the optimal cycle planning path based on the flow resistance and heat transfer effect of each cycle planning path obtained.

[0055] Furthermore, with the goal of allowing the coolant to flow evenly through all parts of the mold, each constructed cooling cycle planning loop path is traversed and analyzed. During the traversal process, the flow resistance data of each cycle planning path is obtained, including the resistance along the way caused by the friction of the pipe wall when the coolant flows in the pipeline, as well as the local resistance generated at the turns and branches of the pipeline. At the same time, the heat transfer effect of each path, that is, the efficiency of the coolant in taking away heat, is evaluated through heat transfer theory calculations or actual measurements. The two key factors of flow resistance and heat transfer effect are comprehensively considered, and the advantages and disadvantages of each path are compared to determine the optimal cycle planning path that can make the coolant flow most smoothly and have the highest heat transfer efficiency. Continuing with the above embodiment, for the three cooling cycle planning loop paths planned for the above-mentioned automotive parts injection mold, through simulation, it is obtained that the flow resistance of path one is 500Pa, and the heat transfer coefficient is 1000W / (m 2 ·K); the flow resistance of path 2 is 300Pa, and the heat transfer coefficient is 800W / (m 2 ·K); the flow resistance of path three is 200Pa, and the heat transfer coefficient is 600W / (m 2 ·K). Taking the flow resistance and heat transfer effect into consideration, path 2 has a better heat transfer effect while ensuring a relatively low flow resistance, so it is determined as the optimal cycle planning path.

[0056] Step 203 , predicting the total flow demand of the coolant based on the cooling demand of the heat load distribution at different parts of the mold and the proportion of various chemical substances in the coolant.

[0057] Furthermore, according to the heat load distribution of different parts of the mold, the amount of heat that needs to be taken away from each part is determined. Parts with high heat load need to take away more heat, and have a greater demand for coolant flow. At the same time, considering the proportion of various chemical substances in the coolant, the coolants composed of different chemical substances have different thermophysical properties such as specific heat capacity, which will affect the ability of the coolant to absorb heat. Combining the heat load distribution and the thermophysical properties of the coolant, the heat transfer formula and the principle of energy conservation are used to calculate the total demand for coolant flow required to meet the overall cooling needs of the mold. Continuing with the above embodiment, in the injection mold for automotive parts, it is analyzed that the heat load in the core area of ​​the cavity is 10000W, the heat load in the peripheral area is 5000W, and the heat load in the edge area is 2000W. The main components of the coolant used are water and ethylene glycol, with a mass ratio of 7:3, and its specific heat capacity is 3500J / (kg·K). The mold operating temperature is 80°C, the coolant inlet temperature is 20°C, and the outlet temperature needs to be controlled at 40°C. According to the heat transfer formula Q = mcΔT (Q is heat, m is mass, c is specific heat capacity, ΔT is temperature change), the heat that needs to be removed from each area is calculated first, and then combined with the thermophysical properties of the coolant, the total coolant flow requirement to meet the cooling needs of the entire mold is calculated to be 80 liters / minute.

[0058] Step 204 , predicting the operating parameters of the coolant pump based on the total flow demand and the along-the-way resistance and local resistance that the internal structure of the cooling channel through which the optimal cycle planning path passes needs to overcome.

[0059] Furthermore, the resistance along the way is related to factors such as the length of the pipeline, the diameter of the pipe, the roughness of the pipe wall, and the flow rate of the coolant, while the local resistance is related to the structures of the elbows, valves, branches, etc. of the pipeline. Therefore, according to the relevant formulas in fluid mechanics, such as Darcy's formula (calculation of resistance along the way) and the local resistance coefficient formula, combined with the total flow demand, the total resistance that the coolant needs to overcome when flowing in the cooling channel is calculated. Then, according to the working characteristic curve of the pump, the operating parameters of the coolant pump that can meet the flow demand and overcome the total resistance are determined, including the pump head, speed, power, etc. In one embodiment, for the determined optimal cycle planning path, the resistance along the way is calculated to be 400Pa, the local resistance is 100Pa, and the total resistance is 500Pa. It is known that the total demand for coolant flow is 80 liters / minute, and the required pump head is calculated to be 10m according to Darcy's formula and the local resistance coefficient formula. By querying the working characteristic curve of the selected coolant pump, when the head is 10m and the flow is 80 liters / minute, the corresponding pump speed is 1800 rpm and the power is 2kW. Therefore, the predicted operating parameters of the coolant pump are head 10m, speed 1800 rpm, and power 2kW.

[0060] Step 205 , operating the coolant pump with the operating parameters, starting the coolant circulation, and controlling the coolant to circulate in the cooling channel.

[0061] Furthermore, according to the predicted coolant pump operating parameters, the pump speed, power and other parameters are set on the operation panel of the coolant supply system. The coolant pump is started to pump the coolant from the storage tank and circulate in the cooling channel according to the optimal circulation planning path.

[0062] The embodiment of the present invention uses a planned cooling path and precise flow control, so that the coolant can efficiently remove the heat of the mold, accelerate the cooling speed, and enhance the cooling efficiency. At the same time, the coolant circulation is started according to accurate operating parameters, so that the coolant can be accurately distributed, avoiding insufficient cooling or excessive cooling, ensuring balanced cooling effects in various areas, improving the uniformity of mold cooling, reducing the problem of thermal stress concentration, and increasing the service life of the mold.

[0063] In one embodiment, the description of steps 2011 to 2014 is as follows:

[0064] Step 2011, based on the heat load distribution at different parts of the mold, the heat load value of each part of the mold is calculated, and the heat load value is mapped to the geometric model of the mold in a heat map to obtain a heat load distribution heat map.

[0065] Optionally, the cooling control system first obtains the heat load distribution data of the mold in different parts. These data can be calculated by temperature sensors installed at key parts of the mold, combined with process parameters in the production process, such as injection pressure, injection speed, plastic melt temperature, etc., using heat transfer theoretical models such as heat conduction, convection and radiation. The system maps the calculated heat load values ​​of each part to the three-dimensional geometric model of the mold with different colors or color depths as markers. Through special thermal analysis software or visual programming tools, a heat map that intuitively displays the heat load distribution of the mold, that is, a heat load distribution heat map, is generated. This heat map can clearly show which parts of the mold have high heat loads and which parts have low heat loads. In one embodiment, in the scene of automotive parts injection molds, the cooling control system is connected to 10 high-precision temperature sensors distributed in different parts such as mold cavities, cores, and edges. During the injection molding production process, when the injection pressure is 80MPa, the injection speed is 50mm / s, and the plastic melt temperature is 220°C, the control system collects temperature sensor data and calculates the heat load values ​​of each part in combination with the heat transfer model. For example, the heat load value of the center of the cavity is 12000W / m 2 , the heat load value of the edge is 3000W / m 2 Using thermal analysis software, these heat load values ​​are mapped to the three-dimensional geometric model of the mold. Areas with high heat loads are displayed in red, and areas with low heat loads are displayed in blue, generating a heat map of the heat load distribution.

[0066] Step 2012: Divide the mold into different cooling demand areas based on the heat load distribution thermal map.

[0067] Furthermore, the temperature reduction control system performs analysis based on the generated heat load distribution heat map. The system sets multiple heat load threshold ranges, and divides the mold into different cooling demand areas according to the threshold ranges in which the heat load values ​​of different areas in the heat map fall. Areas with high and similar heat load values ​​are divided into high cooling demand areas, which require stronger cooling capacity to quickly remove heat; areas with low and similar heat load values ​​are divided into low cooling demand areas, which have relatively low requirements for cooling capacity. During the division process, the structural integrity of the mold and the rationality of the coolant flow are taken into consideration to ensure that the boundaries of the divided areas are clear and the cooling channels are easy to plan.

[0068] In one embodiment, for the thermal load distribution heat map of the above-mentioned automotive parts injection mold, the heat load value is set to be greater than 8000W / m 2 For areas with high cooling demand, 3000-8000W / m 2 For medium cooling demand area, less than 3000W / m 2It is an area with low cooling demand. After analysis, the heat load value of most areas of the cavity and the part of the core close to the melt is greater than 8000W / m 2 , which is divided into high cooling demand areas; the heat load value of the cavity periphery and some areas of the core is 3000-8000W / m 2 The area between the mold and the cooling zone is divided into the medium cooling demand area; the heat load value of the edge of the mold is less than 3000W / m 2 , divided into low cooling demand areas. The system distinguishes these cooling demand areas with different lines or fill colors on the heat map.

[0069] Step 2013, for each branch channel of the cooling channel, the heat dissipation capacity of each branch channel is determined according to the channel diameter and channel length of each branch channel in combination with the principle of fluid mechanics.

[0070] Furthermore, for each branch channel of the mold cooling channel, the temperature reduction control system obtains the diameter and length information of each branch channel. According to the principles of fluid mechanics, such as the Reynolds number calculation formula, the flow state (laminar or turbulent) of the coolant in the channel is determined, and then combined with the convective heat transfer formula, the physical properties such as the flow rate, specific heat capacity, and thermal conductivity of the coolant are considered to calculate the heat that each branch channel can take away per unit time, so as to determine its heat dissipation capacity. At the same time, the influence of the roughness of the inner wall of the channel on the flow resistance and heat transfer coefficient is considered to make the calculation result closer to the actual situation. In one embodiment, in the cooling system of the automotive parts injection mold, there is a branch channel with a diameter of 10mm and a length of 300mm. The temperature reduction control system queries the physical properties of the coolant, and its flow rate is 1m / s, the specific heat capacity is 4200J / (kg·K), the thermal conductivity is 0.6W / (m·K), and the roughness of the inner wall of the channel is 0.01mm. By calculating the Reynolds number, it is determined that the coolant is in a turbulent state, and then the heat dissipation capacity of the branch channel is calculated to be 500 W using the convection heat transfer formula. The system performs similar calculations on all branch channels to obtain the heat dissipation capacity data of each branch channel.

[0071] Step 2014, based on the heat dissipation capacity of each branch channel and the heat load of each cooling demand area, as well as the relative position relationship between each branch channel and each cooling demand area, the cooling demand area expected to correspond to each branch channel is associated and matched to obtain the cooling cycle planning loop path.

[0072] Furthermore, the cooling control system comprehensively considers the heat dissipation capacity of each branch channel, the heat load of each cooling demand area, and the relative position relationship between them. Branch channels with strong heat dissipation capacity are preferentially matched with cooling demand areas with high heat loads. At the same time, it is necessary to ensure that the coolant can flow smoothly from the branch channel into the corresponding cooling demand area to avoid long-distance transportation or unreasonable detours. In the matching process, optimization algorithms, such as genetic algorithms or simulated annealing algorithms, are used to find the optimal matching solution so that the cooling effect of the entire mold is optimally balanced, and finally the cooling cycle planning loop path is obtained.

[0073] In one embodiment, for an injection mold for automotive parts, there are 3 high cooling demand areas, 2 medium cooling demand areas, 1 low cooling demand area, and 5 branch channels. After analysis, the branch channel with the strongest heat dissipation capacity is matched with the high cooling demand area in the center of the cavity with the highest heat load. The branch channel is close to the center of the cavity and can quickly take away the heat. The genetic algorithm is used to match and optimize other branch channels and cooling demand areas, and finally the cooling cycle planning loop path is determined. For example, a branch channel is led out from the main pipeline at the bottom of the mold and directly connected to the high cooling demand area in the center of the cavity.

[0074] The embodiments of the present invention can reasonably plan the coolant flow path according to the heat load of each area and the heat dissipation capacity of the branch channels, ensure that the area with high heat load is cooled by the branch channels with strong heat dissipation capacity, realize efficient allocation of cooling resources, avoid insufficient cooling or excessive cooling, ensure balanced cooling effect of various parts of the mold, improve the uniformity of mold cooling, reduce the problem of thermal stress concentration, and increase the service life of the mold.

[0075] In one embodiment, the description of steps 2021 to 2025 is as follows:

[0076] Step 2021, for each loop planning path in the cooling cycle planning loop path, simulate the flow direction of the coolant, calculate the resistance along the straight pipe section due to the friction between the fluid and the pipe wall, and calculate the local resistance according to the local resistance coefficient table in the local structure part passing through the elbow and branch point.

[0077] Optionally, the cooling control system analyzes each circulation planning path in the cooling circulation planning loop path. When simulating the coolant along the flow direction, for the straight pipe section in the path, the resistance along the path is calculated according to the Darcy formula in fluid mechanics. The Darcy formula is h f =λ*(l / d)*[v 2 / (2g)], where h fis the resistance along the way, λ is the resistance coefficient along the way, l is the length of the straight pipe section, d is the inner diameter of the pipe, v is the fluid velocity, and g is the acceleration of gravity. For local structural parts such as elbows and branch points, the cooling control system looks up the local resistance coefficient ξ of the corresponding structure according to the local resistance coefficient table established in advance, and then calculates the local resistance h using the formula j =[v 2 / (2g)]*ξ, where h j It is local resistance.

[0078] Step 2022, the total flow resistance is obtained based on the along-the-way resistance and local resistance of each segment of each loop planning path.

[0079] Furthermore, the cooling control system accumulates the along-the-line resistance and local resistance of each segment in each loop planning path. For a complete loop planning path, if there are n straight pipe segments generating along-the-line resistances of P f1 ,P f2 ,...,P fn , there are m local structures generating local resistances, which are P j1 ,P j2 ,...,P jm , then the total flow resistance Therefore, the total resistance that each planned circulation path needs to overcome during the coolant flow process can be obtained.

[0080] Step 2023, for each cycle planning path in the cooling cycle planning loop path, simulate and calculate the heat absorbed by the coolant when it flows through various parts of the mold, and calculate the heat transfer coefficient in combination with the convective heat transfer between the coolant and the mold wall.

[0081] Furthermore, the cooling control system simulates the heat absorption process of the coolant when it flows through various parts of the mold for each cycle planning path in the cooling cycle planning loop path. First, according to the law of conservation of energy, the heat Q absorbed by the coolant is calculated, and the formula is Q = m p c p ΔT1, where m p is the coolant mass flow rate, c pis the specific heat capacity of the coolant, and ΔT1 is the temperature change of the coolant before and after it flows through the mold. At the same time, combined with the convective heat transfer process between the coolant and the mold wall, the Newton cooling formula q=hAΔT2 is used, where q is the heat flux density, h is the convective heat transfer coefficient, A is the heat exchange area, and ΔT2 is the temperature difference between the coolant and the mold wall. The convective heat transfer coefficient h is calculated by reverse calculation through the known heat flux density q (which can be calculated by the absorbed heat Q and the heat exchange time and heat exchange area), the heat exchange area A and the temperature difference ΔT2. It should be noted that in the calculation process, the influence of factors such as the thermal conductivity of the mold material, the flow state of the coolant (laminar or turbulent, the heat transfer coefficient is calculated differently under different states) is considered.

[0082] Step 2024, obtaining the total heat transfer effect based on the heat transfer coefficient and temperature difference of each cycle planning path.

[0083] Furthermore, the cooling control system plans each cycle path according to the calculated heat transfer coefficient h and the average temperature difference ΔT between the coolant and the mold. avg , using the formula Q total =hA total ΔT avg Calculate the total heat transfer effect, where A total It is the total heat transfer area between the coolant and the mold in the cycle planning path. The total heat transfer effect reflects the ability of the path to remove heat from the mold during the entire cooling process. The larger the value, the better the heat transfer performance of the path, and the more conducive to the cooling of the mold.

[0084] Step 2025, determine the path whose total heat transfer effect satisfies the uniform cooling requirements of all parts of the mold and whose total flow resistance is minimal as the optimal cycle planning path.

[0085] Furthermore, the cooling control system compares the total heat transfer effect of each circulation planning path with the uniform cooling requirements of each part of the mold, while considering the size of the total flow resistance. The uniform cooling requirements of each part of the mold can be determined based on the heat load distribution of different parts of the mold and the requirements of the production process for mold temperature uniformity. The cooling control system selects the paths whose total heat transfer effect can meet the uniform cooling requirements of each part of the mold, and then selects the path with the smallest total flow resistance among these paths as the optimal circulation planning path. The path determined in this way can not only ensure that each part of the mold is fully and evenly cooled, but also minimize the energy consumed by the coolant during the circulation process, thereby improving the efficiency and economy of the cooling system.

[0086] In one embodiment, there are three cycle planning paths A, B, and C. The total heat transfer effect of cycle planning path A is 65,000 W, and the total flow resistance is 5,000 Pa; the total heat transfer effect of cycle planning path B is 70,000 W, and the total flow resistance is 4,500 Pa; the total heat transfer effect of cycle planning path C is 60,000 W, and the total flow resistance is 4,000 Pa. According to the uniform cooling requirements of various parts of the mold, the total heat transfer effect is required to be no less than 65,000 W. Cycle planning path C does not meet the total heat transfer effect requirements, and the total flow resistance of cycle planning path B is greater than the total flow resistance of cycle planning path A, that is, cycle planning path A meets the total heat transfer effect requirements and the total flow resistance is the smallest among the paths that meet the requirements, so cycle planning path A is determined as the optimal cycle planning path.

[0087] The embodiment of the present invention can select the optimal path from a plurality of cooling cycle planning loop paths. The optimal path minimizes the flow resistance of the coolant during the circulation process while ensuring uniform cooling of all parts of the mold. This means that during the mold cooling process, it can ensure uniform temperature distribution of the mold, meet the strict requirements of the production process on the mold temperature, improve product quality, and reduce the energy consumption required for the coolant circulation, save production costs, improve the operating efficiency and stability of the entire cooling system, and extend the service life of the mold.

[0088] In one embodiment, the description of steps 2031 to 2033 is as follows:

[0089] Step 2031, based on the proportion of various chemical substances in the coolant and the thermophysical properties of various chemical substances, determine the comprehensive thermal performance parameters of the coolant.

[0090] Optionally, the cooling control system obtains information on the proportion of various chemical substances in the coolant. For example, in a mixed coolant of water and ethylene glycol, the mass proportion of water is 70% and the mass proportion of ethylene glycol is 30%. At the same time, the cooling control system stores the thermophysical property data of various chemical substances, such as specific heat capacity, thermal conductivity, density, etc. For specific heat capacity, the specific heat capacity of water is 4200 J / (kg·K), and the specific heat capacity of ethylene glycol is 2400 J / (kg·K).

[0091] Furthermore, the cooling control system calculates the comprehensive specific heat capacity c of the coolant according to the mixing law, taking the proportion of each chemical substance as the weight. mix The calculation formula is Among them, x i is the proportion of the i-th chemical substance, c i is the specific heat capacity of the i-th chemical substance, and N is the number of chemical substances. Similarly, the comprehensive thermal conductivity and comprehensive density of the coolant are calculated to obtain the comprehensive thermal performance parameters including comprehensive specific heat capacity, comprehensive thermal conductivity and comprehensive density.

[0092] Step 2032, based on the cooling demand data of the heat load distribution at different parts of the mold, the temperature difference between the coolant inlet and outlet, the coolant flow rate and comprehensive thermal performance parameters, combined with the relationship between heat transfer and coolant flow rate, determine the coolant flow rate required at different parts of the mold.

[0093] Furthermore, the cooling control system is based on the cooling demand data of the heat load distribution in different parts of the mold, where the cooling demand data is obtained through the early thermal analysis of the mold or the temperature monitoring in actual production. The temperature difference ΔT between the inlet and outlet of the coolant and the flow rate Q of the coolant are known. w (in the initial setting or estimation stage) and comprehensive thermal performance parameters (such as comprehensive specific heat capacity c mix ). According to the heat transfer formula Q heat =m W c mix ΔT, where Q heat is the heat transferred, m w is the coolant quality, which can be converted from flow rate and time, combined with the heat load q of different parts of the mold w (heat flow per unit area) and the area A at which the part is in contact with the coolant W , we can get q w =ρQ w c mix Δt, where ρ is the coolant density, which is calculated from the comprehensive density, and the coolant flow Q required at different parts of the mold can be inferred required Therefore, the temperature control system calculates the coolant flow rate that meets the cooling needs of each key part of the mold.

[0094] Step 2033: Based on the coupling loss of heat transfer between different parts, the coolant flow required at different parts of the mold is integrated to predict the total coolant flow requirement.

[0095] Furthermore, the temperature-cooling control system takes into account the coupling loss of heat transfer between different parts of the mold. Since heat will be transferred from parts with high heat load to parts with low heat load, the coolant flow required for each part cannot be simply added when calculating the total coolant flow demand. Therefore, the temperature-cooling control system uses methods such as thermal network models or finite element analysis to consider heat transfer methods such as heat conduction, convection and radiation between parts, and integrates the coolant flow required for each part. For example, finite element analysis is used to simulate the heat transfer process inside the mold and evaluate the impact of coupling losses on the actual cooling needs of each part.

[0096] For parts with high heat load and strong thermal coupling with other parts, the coolant flow distribution is appropriately increased; for parts with low heat load and receiving heat from other parts, the coolant flow distribution is appropriately reduced. Finally, the system adds the coolant flow of each part after integration to predict the total coolant flow demand to meet the cooling needs of the entire mold. In one embodiment, in the above-mentioned automotive parts injection mold, the required coolant flow rate is calculated to be 50L / min for the cavity part, and the required coolant flow rate is calculated to be 30L / min for the core part. Finite element analysis found that there is a strong thermal coupling between the cavity and the core, and the cavity transfers heat to the core. After considering the coupling loss, the cavity coolant flow rate is appropriately increased to 55L / min, and the core coolant flow rate is reduced to 25L / min. The total flow demand of the coolant is 55+25=80L / min.

[0097] The embodiment of the present invention can accurately predict the total demand for coolant flow that meets the cooling needs of the mold. On the basis of determining the comprehensive thermal performance parameters of the coolant, combined with the heat load and heat transfer relationship of different parts of the mold, and considering the coupling loss between parts, the total demand for coolant flow obtained is more in line with the actual cooling conditions of the mold. This makes it possible to reasonably configure the coolant supply equipment during the design and operation of the mold cooling system to ensure that the coolant can meet the cooling needs of various parts while avoiding energy waste caused by excessive flow or insufficient cooling caused by too small flow. Thereby improving the cooling efficiency of the mold, ensuring the uniformity of the mold temperature, improving product quality, reducing production costs, and enhancing the reliability and stability of the entire cooling system.

[0098] In one embodiment, the description of steps 2041 to 2044 is as follows:

[0099] Step 2041, based on the channel opening size of the cooling channel, the density of the coolant, and the along-the-way resistance and local resistance that need to be overcome by the optimal circulation planning path, predict the head that the coolant pump needs to provide.

[0100] Optionally, the cooling control system first determines the size of the channel opening of the cooling channel. The size of the channel opening is related to the flow rate change and pressure loss of the coolant at the channel opening. According to the principles of fluid mechanics, the head H that the pump needs to provide must be able to overcome these resistances and compensate for the pressure loss at the channel opening. The calculation formula for the head is H = ΔP / (ρg) + ΔH local +ΔH friction , where ΔP is the pressure change at the channel port (which can be calculated based on the flow velocity change at the channel port and the Bernoulli equation), ρ is the coolant density, g is the gravitational acceleration, and ΔH local is the head loss corresponding to the local resistance, ΔH friction It is the head loss corresponding to the resistance along the way. The cooling control system calculates the head that the coolant pump needs to provide by substituting relevant data.

[0101] Step 2042, predicting the shaft power required for the operation of the coolant pump based on the efficiency and head of the coolant pump combined with the total flow demand.

[0102] Furthermore, the cooling control system knows the efficiency η of the coolant pump, which is an indicator of the pump's ability to convert input power into effective output power and is provided by the pump manufacturer. The head H that the pump needs to provide and the total flow demand Q predicted in step 2033 are obtained through step 2041. total According to the power calculation formula P = (ρgQ total H) / η, where P is the shaft power. Therefore, the cooling control system substitutes these parameters into the formula to calculate the shaft power required for the coolant pump to operate, where the shaft power reflects the amount of energy required to drive the pump to operate.

[0103] Step 2043, based on the flow coefficient, head coefficient, pump impeller diameter and head of the coolant pump, and in combination with the channel opening size and total flow demand of the cooling channel, predict the speed of the coolant pump

[0104] Furthermore, the cooling control system is based on the flow coefficient of the coolant pump Head coefficient ψ, these coefficients are inherent characteristic parameters of the pump and are related to the design structure of the pump. The pump impeller diameter D and the head H obtained in step 2041 are known. At the same time, the channel opening size of the cooling channel (affecting the flow rate) and the total flow demand Q are combined total According to the pump similarity law, the flow rate is proportional to the speed. The lift is proportional to the square of the speed The speed n can be derived by combining the flow coefficient and flow relationship correction e The calculation formula is The cooling control system calculates the speed of the coolant pump by substituting these parameters. The speed determines the operating frequency of the pump and affects the flow and pressure output of the coolant.

[0105] Step 2044, determining the rotation speed of the coolant pump and the shaft power required for operation as operation parameters.

[0106] Furthermore, the temperature reduction control system determines the shaft power required for the operation of the coolant pump calculated in step 2042 and the coolant pump speed predicted in step 2043 as the operating parameters of the coolant pump. These operating parameters will be used to set and control the operating state of the coolant pump in the actual mold cooling system to ensure that the coolant pump can provide sufficient pressure and flow to meet the mold cooling requirements.

[0107] In one embodiment, the temperature reduction control system determines the shaft power of 767.5W and the speed of 1470r / min as the operating parameters of the coolant pump, and transmits these parameters to the control system of the coolant pump. In actual operation, the operator debugs and monitors the coolant pump according to these parameters to ensure that the pump provides a stable coolant circulation for the mold cooling system according to the design requirements.

[0108] The embodiment of the present invention can accurately determine the operating parameters of the coolant pump, and based on the cooling channel characteristics, the physical properties of the coolant, and the mold cooling requirements, the calculated head, shaft power, and speed ensure that the coolant pump can achieve efficient operation while meeting the mold cooling requirements. This enables the coolant pump to be reasonably selected and configured during the design and operation of the mold cooling system to avoid insufficient cooling or energy waste due to inappropriate pump parameters. Reasonable operating parameter settings improve the stability and reliability of the mold cooling system and ensure the uniformity of the mold temperature, thereby improving product quality, reducing production costs, extending the service life of equipment, and enhancing the performance of the entire cooling system.

[0109] In one embodiment, the description of steps 301 to 303 is as follows:

[0110] Step 301, calculating the working parameters of the ultrasonic vibration device according to the structure of the cooling channel and the characteristics of the coolant.

[0111] Optionally, the working parameters in the embodiment of the present invention include the frequency, amplitude and power of the ultrasonic wave. Therefore, the temperature reduction control system comprehensively analyzes the structure of the cooling channel, including the diameter, length, shape, etc. of the channel. The characteristics of the coolant, such as density, viscosity, specific heat capacity, etc. For the calculation of the working parameters of the ultrasonic vibration device, in terms of frequency, the size of the cooling channel is considered. Generally speaking, cooling channels with smaller diameters are suitable for higher frequency ultrasonic waves, because high-frequency ultrasonic waves have relatively less energy attenuation when propagating in a small space, and act more effectively on the coolant. According to the empirical formula f=c / (2L), where f is the frequency, c is the propagation speed of the ultrasonic wave in the coolant, and L is the characteristic length of the cooling channel, such as the diameter, the frequency range can be preliminarily estimated.

[0112] The determination of amplitude is related to the physical properties of the coolant. A coolant with a higher viscosity requires a larger amplitude to overcome its internal resistance and cause the coolant to vibrate. Usually, a relationship model between amplitude and coolant viscosity and density is established through experimental data fitting or numerical simulation to calculate the appropriate amplitude. The calculation of power takes frequency and amplitude into consideration. Power P is proportional to frequency f and the square of amplitude A, that is, P∝fA 2 , and at the same time, combined with the volume of coolant that needs to be vibrated in the cooling channel, determine the power required to meet the vibration requirements.

[0113] Step 302, starting the ultrasonic vibration device with the working parameters to emit ultrasonic waves, and calculating the best parameter combination that can form effective turbulence in the cooling channel based on the propagation path of the ultrasonic waves in the coolant, combined with the density and viscosity of the coolant, and the shape, bends and branches of the cooling channel;

[0114] Furthermore, the cooling control system starts the ultrasonic vibration device to emit ultrasonic waves with the calculated working parameters, and uses acoustic theory and fluid mechanics principles to analyze the propagation path of ultrasonic waves in the coolant. The density and viscosity of the coolant are considered. The density affects the acoustic impedance during ultrasonic propagation, and the viscosity determines the friction resistance inside the coolant. The shape, bends, and branches of the cooling channel will change the direction and intensity of ultrasonic propagation, and at the same time affect the flow state of the coolant.

[0115] Therefore, the cooling control system uses numerical simulation software, such as COMSOL Multiphysics, to establish an ultrasonic-coolant-cooling channel coupling model. Different frequency, amplitude and power combinations are set in the model to simulate the flow of coolant in the cooling channel and observe whether turbulence is formed and the intensity and uniformity of the turbulence. When the turbulence intensity reaches a certain threshold, such as the turbulent Reynolds number The goal is to achieve uniform distribution in the cooling channel and screen out the best combination of frequency, amplitude and power parameters.

[0116] In one embodiment, the temperature reduction control system starts the ultrasonic vibration device, the frequency is set to 15000Hz, the amplitude is 0.0001m, and the power is 500W. A cooling channel model is constructed in COMSOL Multiphysics software, and the channel shape is a complex S-shape, with two 90° bends and one branch. The coolant properties are set according to the actual parameters. Through multiple simulations of different parameter combinations, when the frequency is adjusted to 18000Hz, the amplitude is increased to 0.00012m, and the power is increased to 600W, the simulation results show that the turbulent Reynolds number of the coolant in the cooling channel reaches 5000, and the turbulence is relatively evenly distributed throughout the channel. The temperature reduction control system determines this frequency, amplitude and power parameter combination as the optimal parameter combination.

[0117] Step 303: Control the coolant to form turbulence in the cooling channel with the optimal parameter combination.

[0118] Further, the temperature reduction control system transmits the optimal parameter combination determined in step 302 to the controller of the ultrasonic vibration device. The controller accurately adjusts the working state of the ultrasonic vibration device according to the received parameters, so that the ultrasonic wave acts on the coolant in the cooling channel with the optimal frequency, amplitude and power. During operation, the system continuously monitors the flow state of the coolant, and can obtain the real-time flow rate, pressure and other data of the coolant by installing flow rate sensors, pressure sensors and other equipment in the cooling channel. According to these data feedbacks, the parameters of the ultrasonic vibration device are fine-tuned to ensure that the coolant always remains in the optimal turbulent state, achieve efficient heat transfer, and quickly reduce the mold temperature. Continuing with the above embodiment, the optimal parameter combination (frequency 18000Hz, amplitude 0.00012m, power 600W) is sent to the controller of the ultrasonic vibration device. During the mold cooling process, the flow rate sensor installed in the cooling channel feeds back the coolant flow rate data in real time. When the flow velocity in a certain section of the cooling channel fluctuates abnormally, which may affect the turbulent stability, the cooling control system will adjust the ultrasonic power to 650W according to the preset algorithm, so that the coolant flow rate can be restored to a stable state, maintain a good turbulent state, effectively remove the heat from the mold, and ensure uniform cooling of all parts of the mold.

[0119] The embodiment of the present invention can accurately determine the working parameters of the ultrasonic vibration device and realize effective control of the turbulence formed by the coolant in the cooling channel. The accurately calculated working parameters ensure that the ultrasonic wave can match the characteristics of the coolant and the cooling channel. The optimal parameter combination screened by simulation enables the coolant to form a stable and efficient turbulence. Turbulence can destroy the boundary layer between the coolant and the mold wall and enhance the heat exchange between the coolant and the mold wall. The coolant can contact various parts of the mold more evenly, take away heat, reduce the difference in cooling speed between different parts, and improve the uniformity of mold cooling. Therefore, it helps to improve the production efficiency of the mold, reduce product defects caused by uneven temperature, and improve product quality. At the same time, the parameters of the ultrasonic vibration device are reasonably controlled to avoid energy waste and excessive equipment loss, reduce production costs, extend the service life of equipment, and improve the performance and reliability of the entire mold cooling system.

[0120] See also Figure 3 , Figure 3 FIG. 1 is an embodiment diagram of an electronic device provided by an embodiment of the present invention. Figure 3 As shown, an embodiment of the present invention provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor 320. When the processor 320 executes the computer program 311, the following steps are implemented:

[0121] Control the connection between the cooling channel of the mold and the external coolant supply system;

[0122] Start the coolant circulation to control the coolant in the external coolant supply system to circulate in the cooling channel;

[0123] After the coolant circulation starts for a preset time, the ultrasonic vibration device is started to control the coolant to form turbulence in the cooling channel based on the ultrasonic vibration device;

[0124] When it is detected that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to undergo phase change, and the flow rate of the coolant in the cooling channel is adjusted based on the real-time temperature drop of the mold after the phase change material undergoes phase change;

[0125] When the temperature of the mold drops to the target temperature, the operation of the ultrasonic vibration device is stopped and the external coolant supply system is closed to achieve rapid cooling of the mold.

[0126] See also Figure 4 , Figure 4 Detailed description of an embodiment of a computer-readable storage medium provided by an embodiment of the present invention. Figure 4 As shown, this embodiment provides a computer-readable storage medium 400, on which a computer program 311 is stored. When the computer program 311 is executed by a processor, the following steps are implemented:

[0127] Control the connection between the cooling channel of the mold and the external coolant supply system;

[0128] Start the coolant circulation to control the coolant in the external coolant supply system to circulate in the cooling channel;

[0129] After the coolant circulation starts for a preset time, the ultrasonic vibration device is started to control the coolant to form turbulence in the cooling channel based on the ultrasonic vibration device;

[0130] When it is detected that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to undergo phase change, and the flow rate of the coolant in the cooling channel is adjusted based on the real-time temperature drop of the mold after the phase change material undergoes phase change;

[0131] When the temperature of the mold drops to the target temperature, the operation of the ultrasonic vibration device is stopped and the external coolant supply system is closed to achieve rapid cooling of the mold.

[0132] On the other hand, the present invention further provides a computer program product, which includes a computer program. The computer program can be stored in a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the mold rapid cooling control method provided by the above methods. The mold rapid cooling control method includes:

[0133] Control the connection between the cooling channel of the mold and the external coolant supply system;

[0134] Start the coolant circulation to control the coolant in the external coolant supply system to circulate in the cooling channel;

[0135] After the coolant circulation starts for a preset time, the ultrasonic vibration device is started to control the coolant to form turbulence in the cooling channel based on the ultrasonic vibration device;

[0136] When it is detected that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to undergo phase change, and the flow rate of the coolant in the cooling channel is adjusted based on the real-time temperature drop of the mold after the phase change material undergoes phase change;

[0137] When the temperature of the mold drops to the target temperature, the operation of the ultrasonic vibration device is stopped and the external coolant supply system is closed to achieve rapid cooling of the mold.

[0138] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0139] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mold quick-acting temperature reduction control system, characterized in that: There is a phase change material chamber inside the mold, and the phase change material chamber is filled with phase change material; a plurality of ultrasonic vibration devices are evenly arranged on the outer surface of the mold; the mold quick-acting cooling control system includes a cooling control center, an equipment control module, a cycle start module, a device start module, a flow rate control module and an operation control module; the cooling control center is respectively connected to the equipment control module, the cycle start module, the device start module, the flow rate control module and the operation control module to manage each module; An equipment control module, used for controlling the cooling channel of the mold to be connected to an external coolant supply system; A circulation start module, used to start the coolant circulation, so as to control the coolant in the external coolant supply system to circulate in the cooling channel; A device starting module, used to start the ultrasonic vibration device after the coolant circulation starts for a preset time, so as to control the coolant to form turbulent flow in the cooling channel based on the ultrasonic vibration device; A flow rate control module, for controlling the phase change material to undergo phase change when the temperature of the mold reaches the phase change temperature of the phase change material, and adjusting the flow rate of the coolant in the cooling channel based on the real-time cooling of the mold after the phase change material undergoes phase change; The operation control module is used to stop the operation of the ultrasonic vibration device and close the external coolant supply system when the temperature of the mold drops to the target temperature, so as to achieve rapid cooling of the mold.

2. A mold quick-acting cooling control method, implemented based on the mold quick-acting cooling control system according to claim 1, characterized in that: The mold has a phase change material chamber inside, and the phase change material chamber is filled with phase change material; a plurality of ultrasonic vibration devices are evenly arranged on the outer surface of the mold; and the method comprises: Controlling the cooling channel of the mold to be connected to an external coolant supply system; Starting the coolant circulation to control the coolant in the external coolant supply system to circulate in the cooling channel; After the coolant circulation starts for a preset time, the ultrasonic vibration device is started to control the coolant to form turbulent flow in the cooling channel based on the ultrasonic vibration device; When it is monitored that the temperature of the mold reaches the phase change temperature of the phase change material, the phase change material is controlled to undergo a phase change, and the flow rate of the coolant in the cooling channel is adjusted based on the real-time temperature drop of the mold after the phase change material undergoes a phase change; When the temperature of the mold drops to the target temperature, the operation of the ultrasonic vibration device is stopped, and the external coolant supply system is closed to achieve rapid cooling of the mold.

3. The mold quick-acting temperature reduction control method according to claim 2, characterized in that: The starting of the coolant circulation to control the coolant in the external coolant supply system to circulate in the cooling channel includes: Based on the branching of the cooling channel and the cooling requirements of the heat load distribution at different parts of the mold, a cooling cycle planning loop path is constructed; The cooling cycle planning loop path is traversed with the goal of allowing the coolant to flow evenly through various parts of the mold, and an optimal cycle planning path is determined based on the flow resistance and heat transfer effect of each cycle planning path obtained; Predicting the total flow demand of the coolant based on the cooling demand of the heat load distribution at different parts of the mold and the proportion of various chemical substances in the coolant; Based on the total flow demand and the along-the-way resistance and local resistance that the internal structure of the cooling channel through which the optimal circulation planning path passes needs to overcome, predict the operating parameters of the coolant pump; The coolant pump is operated with the operating parameters to start the coolant circulation, and the coolant is controlled to circulate in the cooling channel.

4. The mold quick-acting temperature reduction control method according to claim 3 is characterized in that: The step of constructing a cooling cycle planning loop path based on the branching conditions of the cooling channel and the cooling requirements of the heat load distribution at different parts of the mold includes: Calculating the heat load value of each part of the mold based on the heat load distribution of the mold at different parts, and mapping the heat load value to the geometric model of the mold in a heat map to obtain a heat load distribution heat map; Dividing the mold into different cooling demand areas based on the heat load distribution thermal map; For each branch channel of the cooling channel, the heat dissipation capacity of each branch channel is determined according to the channel diameter and channel length of each branch channel combined with the principle of fluid mechanics; Based on the heat dissipation capacity of each branch channel and the heat load of each cooling demand area, as well as the relative position relationship between each branch channel and each cooling demand area, the cooling demand areas expected to correspond to each branch channel are associated and matched to obtain the cooling cycle planning loop path.

5. The mold quick-acting temperature reduction control method according to claim 3, characterized in that: The step of traversing the cooling cycle planning loop path with the goal of allowing the coolant to flow evenly through various parts of the mold, and determining the optimal cycle planning path based on the flow resistance and heat transfer effect of each cycle planning path obtained, includes: For each circulation planning path in the cooling circulation planning loop path, simulate the flow direction of the coolant, calculate the resistance along the straight pipe section due to the friction between the fluid and the pipe wall, and calculate the local resistance according to the local resistance coefficient table in the local structure part passing through the elbow and branch point; The total flow resistance is obtained based on the resistance along each section and the local resistance of each loop planning path; For each circulation planning path in the cooling circulation planning loop path, the heat absorbed by the coolant when flowing through each part of the mold is simulated and calculated, and the heat transfer coefficient is calculated in combination with the convection heat transfer between the coolant and the mold wall; The total heat transfer effect is obtained based on the heat transfer coefficient and temperature difference of each cycle planning path; The path whose total heat transfer effect satisfies the uniform cooling requirements of various parts of the mold and whose total flow resistance is minimal is determined as the optimal cycle planning path.

6. The mold quick-acting temperature reduction control method according to claim 3 is characterized in that: The cooling demand based on the heat load distribution of different parts of the mold and the proportion of various chemical substances in the coolant is predicted to have a total flow demand of the coolant, including: Determining comprehensive thermal performance parameters of the coolant based on the proportion of various chemical substances in the coolant and the thermophysical properties of various chemical substances; Based on the cooling demand data of the heat load distribution at different parts of the mold, the temperature difference between the inlet and outlet of the coolant, the flow rate and comprehensive thermal performance parameters of the coolant, and the relationship between heat transfer and coolant flow rate, the coolant flow rate required at different parts of the mold is determined; Based on the coupling loss of heat transfer between different parts, the coolant flow required at different parts of the mold is integrated to predict the total flow demand of the coolant.

7. The mold quick-acting temperature reduction control method according to claim 3 is characterized in that: The predicting of the operating parameters of the coolant pump based on the total flow demand and the along-the-way resistance and local resistance that the internal structure of the cooling channel through which the optimal circulation planning path passes needs to overcome includes: Based on the size of the channel opening of the cooling channel, the density of the coolant, and the along-the-way resistance and local resistance that the optimal circulation planning path needs to overcome, predict the head that the coolant pump needs to provide; Predicting the shaft power required for the operation of the coolant pump based on the efficiency and head of the coolant pump combined with the total flow demand; Predicting the rotation speed of the coolant pump based on the flow coefficient, head coefficient, pump impeller diameter and head of the coolant pump, and in combination with the channel opening size of the cooling channel and the total flow demand; The rotation speed of the coolant pump and the shaft power required for operation are determined as the operation parameters.

8. The mold quick-acting temperature reduction control method according to any one of claims 2 to 7, characterized in that: The step of starting the ultrasonic vibration device to control the coolant to form turbulence in the cooling channel based on the ultrasonic vibration device includes: Calculating the working parameters of the ultrasonic vibration device according to the structure of the cooling channel and the characteristics of the coolant; the working parameters include the frequency, amplitude and power of the ultrasonic wave; The ultrasonic vibration device is started to emit ultrasonic waves with the working parameters, and based on the propagation path of the ultrasonic waves in the coolant, combined with the density and viscosity of the coolant, and the shape, bends and branches of the cooling channel, an optimal parameter combination capable of forming effective turbulence in the cooling channel is calculated; The coolant is controlled by the optimal parameter combination to form turbulence in the cooling channel.

9. An electronic device, comprising: A memory and a processor, characterized in that a computer software program is stored in the memory, and when the processor reads and executes the computer software program, the mold rapid cooling control method as described in any one of claims 2 to 8 is implemented.

10. A non-transitory computer-readable storage medium, characterized in that: The storage medium stores a computer software program, and when the computer software program is executed by the processor, the mold rapid cooling control method according to any one of claims 2 to 8 is implemented.

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