Mold cooling liquid flow control method, system, device and storage medium

Abstract

The present invention discloses a mold cooling liquid flow control method, system, device and storage medium, wherein the mold cooling liquid flow control method includes: determining the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object; judging whether the heat exchange capacity reaches the first preset heat exchange capacity; if the heat exchange capacity reaches the first preset heat exchange capacity, reducing the coolant flow entering the liquid cooling pipeline to increase the temperature of the outer layer of the molding object; judging again whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the molding object reaches the third preset heat exchange capacity; if the heat exchange capacity reaches the third preset heat exchange capacity, increasing the coolant flow entering the liquid cooling pipeline, and returning to execute the step of judging whether the heat exchange capacity reaches the first preset heat exchange capacity. The technical solution of the present invention can reduce the defective rate of the molding object after demolding.

Description

Technical Field

[0001] The present invention relates to the technical field of mold cooling liquid flow control, and in particular to a mold cooling liquid flow control method, system, device and storage medium. Background Art

[0002] At present, in the molding process of molding objects such as shells and parts, the mold needs to quickly dissipate the heat of the molded object after casting so that it can be quickly molded and demolded. At present, there are two main ways of heat dissipation: air cooling and liquid cooling. As the name suggests, liquid cooling means pre-setting pipelines in the mold, and then passing coolant into it to dissipate the heat of the molding object.

[0003] Generally speaking, the lower the coolant temperature, the better the heat dissipation effect on the molding object. However, for thicker molding objects, the lower the coolant temperature, the lower the heat dissipation capacity will be hindered due to its own low temperature, resulting in a high defective rate of the molding object after demolding. Summary of the invention

[0004] The main purpose of the present invention is to provide a mold cooling liquid flow control method, which aims to solve the problem that the lower the coolant temperature, the lower the heat dissipation capacity will be affected, thereby causing a high defective rate of the molded object.

[0005] To achieve the above-mentioned purpose, the present invention proposes a mold cooling liquid flow control method, wherein the coolant is used to liquid-cool the molding object in the mold cavity, so the molding object has an outer layer portion in contact with the mold cavity, and the mold cooling liquid flow control method comprises:

[0006] Determine the heat exchange capacity between the coolant in the liquid cooling circuit and the outer layer of the molding object;

[0007] Determining whether the heat exchange capacity reaches a first preset heat exchange capacity;

[0008] If the heat exchange capacity reaches the first preset heat exchange capacity, the flow rate of the coolant entering the liquid cooling pipeline is reduced to increase the temperature of the outer layer of the molding object;

[0009] determining again whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object reaches a third preset heat exchange capacity;

[0010] If the heat exchange capacity reaches the third preset heat exchange capacity, the flow rate of the coolant entering the liquid cooling pipeline is increased, and the process returns to the step of determining whether the heat exchange capacity reaches the first preset heat exchange capacity;

[0011] Among them, the first preset heat exchange capacity is smaller than the third preset heat exchange capacity, the third preset heat exchange capacity is smaller than the second preset heat exchange capacity, and the second preset heat exchange capacity is the heat exchange capacity of the coolant with the outer layer of the molding object at the initial temperature and initial flow rate.

[0012] Optionally, the step of determining the heat exchange capacity between the coolant in the liquid cooling circuit and the outer layer of the molding object comprises:

[0013] Obtaining an average liquid temperature of the coolant in the liquid cooling pipeline and an average end surface temperature of the outer layer of the molding object;

[0014] The heat exchange capacity between the coolant in the liquid cooling circuit and the outer layer of the molding object is determined based on the initial temperature of the coolant, the initial temperature of the molding object, the average liquid temperature and the average end surface temperature.

[0015] Optionally, the step of reducing the flow rate of coolant entering the liquid cooling circuit comprises:

[0016] Obtaining a target flow rate of coolant in a liquid cooling pipeline;

[0017] According to the target flow rate, the coolant flow rate entering the liquid cooling line is reduced to the target flow rate.

[0018] Optionally, the step of obtaining a target flow rate of the coolant in the liquid cooling pipeline includes:

[0019] Get the adjustment time and the current flow rate of the coolant in the liquid cooling line;

[0020] Calculating a flow rate change of the coolant according to the first preset heat exchange capacity, the third preset heat exchange capacity, the initial temperature of the coolant, the initial temperature of the molding object, the current flow rate of the coolant, and the adjustment time;

[0021] The target flow rate of the coolant is determined based on the flow rate change and the current flow rate.

[0022] Optionally, the step of calculating the flow change of the coolant according to the first preset heat exchange capacity, the third preset heat exchange capacity, the initial temperature of the coolant, the initial temperature of the molding object and the adjustment time is specifically:

[0023] The third preset heat exchange capacity is calculated as a difference with the first preset heat exchange capacity to obtain a heat exchange capacity difference, the initial temperature of the coolant and the initial temperature of the molding object are calculated as a difference to obtain a maximum temperature difference, the heat exchange capacity difference and the maximum temperature difference are multiplied to obtain a temperature change value, and the temperature change value, the adjustment time, and the current flow rate are substituted into a preset temperature-flow rate conversion formula to obtain the flow rate change.

[0024] Optionally, the step of increasing the flow rate of coolant entering the liquid cooling pipeline includes:

[0025] Increase the coolant flow rate to the initial flow rate.

[0026] Optionally, the step of again determining whether the heat exchange capacity between the coolant in the liquid cooling circuit and the molding object reaches a third preset heat exchange capacity includes:

[0027] Determining whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the molding object reaches a third preset heat exchange capacity within a preset time period;

[0028] If the heat exchange capacity reaches the third preset heat exchange capacity within the preset time, then the flow rate of the coolant entering the liquid cooling pipeline is subsequently increased, and the process returns to the step of determining whether the heat exchange capacity reaches the first preset heat exchange capacity;

[0029] If the heat exchange capacity does not reach the third preset heat exchange capacity within the preset time, an ejection request instruction is output to the ejection mechanism, so that the ejection mechanism ejects the molded object in the mold cavity and restores the flow rate of the coolant in the liquid cooling pipeline to the initial flow rate.

[0030] The technical solution of the present invention also provides a mold cooling liquid flow control device, the mold cooling liquid flow control device comprising:

[0031] Memory; storage is used to store programs;

[0032] Processor; The processor is used to execute the steps of the mold cooling liquid flow control method as described above by calling the mold cooling liquid flow control program stored in the memory.

[0033] The technical solution of the present invention further proposes a mold cooling liquid flow control system, which includes the mold cooling liquid flow control device as described above.

[0034] The technical solution of the present invention further proposes a storage medium, on which a mold cooling liquid flow control program is stored. When the mold cooling liquid flow control program is executed by a processor, the steps of the mold cooling liquid flow control method as described above are implemented.

[0035] The technical solution of the present invention determines the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object; determines whether the heat exchange capacity reaches the first preset heat exchange capacity; if the heat exchange capacity reaches the first preset heat exchange capacity, the flow rate of the coolant entering the liquid cooling pipeline is reduced to increase the temperature of the outer layer of the molding object; again determines whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object reaches the third preset heat exchange capacity; if the heat exchange capacity reaches the third preset heat exchange capacity, the flow rate of the coolant entering the liquid cooling pipeline is increased, and the step of determining whether the heat exchange capacity reaches the first preset heat exchange capacity is returned. This cycle is repeated until the liquid cooling and heat dissipation process for the molding object is completed, which can ensure that all levels of the molding object are fully liquid cooled and heat dissipated, thereby avoiding the molding object being affected by the low-temperature coolant and unable to fully dissipate the heat of the deeper layers inside the molding object, and thus solving the problem that the lower the coolant temperature, the lower the heat dissipation capacity will be affected, resulting in an excessively high defective rate of the molding object. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of temperature distribution when liquid cooling is performed on a molding object in a conventional technical solution;

[0038] Figure 2 It is a schematic flow chart of an embodiment of a method for controlling the flow rate of mold cooling liquid of the present invention;

[0039] Figure 3 This is a detailed flow chart of step S100 in an embodiment of a method for controlling the flow rate of mold cooling liquid according to the present invention;

[0040] Figure 4 This is a detailed flow chart of step S300 in an embodiment of a method for controlling the flow rate of mold cooling liquid according to the present invention;

[0041] Figure 5 This is a detailed flow chart of step S400 in an embodiment of a method for controlling the flow rate of mold cooling liquid according to the present invention;

[0042] Figure 6 It is a structural schematic diagram of an embodiment of a mold cooling liquid flow control device of the present invention.

[0043] Description of Figure Numbers:

[0044] Label name Label name 11 Memory 13 Communication Bus 12 processor

[0045] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The invention provides a method for controlling the flow rate of mold cooling liquid.

[0049] The inventor of this solution discovered in actual production that there is a misunderstanding in the current liquid cooling technology, that is, the colder the coolant, the better. However, multiple tests have found that the colder the coolant, the higher the defective rate for thicker molding objects. By investigating defective products, it is found that there is such a phenomenon, specifically, Figure 1 As shown in the figure, after the coolant with too low temperature is introduced, the temperature of the A layer of the molding object that is most in contact with the mold cavity will drop rapidly to a temperature close to the temperature of the coolant. Although the A layer as the outermost layer of the molding object has been formed at this time, the B layer and the C layer inside the molding object are actually still at a higher temperature. According to the heat exchange principle, the heat exchange capacity is stronger when the temperature difference is large. At this time, the A layer is close to the temperature of the coolant. At this time, the heat exchange capacity depends entirely on the heat exchange between the A layer and the B layer, and the heat exchange between the C layer and the B layer. In other words, the A layer hinders the heat exchange capacity of the coolant at this time. In addition, due to the rapid cooling of the A layer, the molding object has completely reached the conditions for demolding. After the molding object is demolded, the higher temperature in the C layer will exchange heat with the A layer through the B layer, resulting in the risk of the molded object being deformed again, which in turn leads to a high defective rate after demolding.

[0050] For the above problems, refer to Figure 2, the mold cooling liquid flow control methods include:

[0051] Step S100, determining the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object;

[0052] Step S200, determining whether the heat exchange capacity reaches a first preset heat exchange capacity;

[0053] Step S300: if the heat exchange capacity reaches the first preset heat exchange capacity, the flow rate of the coolant entering the liquid cooling pipeline is reduced to increase the temperature of the outer layer of the molding object;

[0054] Step S400, determining again whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object reaches a third preset heat exchange capacity;

[0055] Step S500: if the heat exchange capacity reaches the third preset heat exchange capacity, the flow rate of the coolant entering the liquid cooling pipeline is increased, and the process returns to step S200 to determine whether the heat exchange capacity reaches the first preset heat exchange capacity;

[0056] Among them, the first preset heat exchange capacity is smaller than the third preset heat exchange capacity, the third preset heat exchange capacity is smaller than the second preset heat exchange capacity, and the second preset heat exchange capacity is the heat exchange capacity of the coolant with the outer layer of the molding object at the initial temperature and initial flow rate.

[0057] In step S100, the liquid cooling pipeline is a portion of the pipeline through which the coolant flows and exchanges heat with the molding object. The heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object is the real-time heat exchange capacity, which can be determined by calculating the ratio of the real-time temperature difference between the two and the maximum temperature difference between the two. For example, if the real-time temperature difference between the coolant in the liquid cooling pipeline and the outer layer of the molding object is 50°, and the maximum temperature difference between the coolant in the liquid cooling pipeline and the outer layer of the molding object is 100°, it can be determined that the heat exchange capacity at this time is 50%. Alternatively, the heat exchange capacity of the two can also be determined by detecting the temperature of the coolant flowing out of the liquid outlet of the liquid cooling pipeline. The heat exchange capacity in this embodiment is relative to the maximum temperature difference between the coolant and the outer layer of the molding object. It should be noted that step S100 is executed in the entire cooling process of the molding object (including steps S200 to S500) until the liquid cooling process of the molding object is completed.

[0058] In step S200, it can be understood that when the coolant is just introduced, the flow rate of the coolant in the liquid cooling pipeline is at a normal initial flow rate, and the temperature of the outer layer of the molding object is the highest at this time, so the heat exchange capacity of the two is the largest at this time, and as the liquid cooling of the molding object is carried out, the temperature of the outer layer of the molding object decreases, and the heat exchange capacity of the two begins to decrease. When the temperature of the outer layer of the molding object is close to the temperature of the coolant, the heat exchange capacity reaches the minimum. However, it should be noted that since the temperature of the outer layer of the molding object will not drop to the same level as the initial temperature of the coolant, it can usually only drop to a temperature close to about 70%-90% of it, so the heat exchange capacity will not drop to 0 no matter how small it is. In this embodiment, the first preset heat exchange capacity is the heat exchange capacity when the temperature of the outer layer of the molding object is closest to the temperature of the coolant, and the second preset heat exchange capacity is the heat exchange capacity between the coolant and the outer layer of the molding object when the coolant is just introduced. The first preset heat exchange capacity and the second preset heat exchange capacity can both be measured by preliminary experiments. For example, the first preset heat exchange capacity can be 25%, and the second preset heat exchange capacity can be 100%. The real-time heat exchange capacity determined in step S100 can be compared with the first preset heat exchange capacity to determine whether the heat exchange capacity between the coolant in the liquid cooling circuit and the outer layer of the molding object reaches the first preset heat exchange capacity.

[0059] In step S300, if the comparison result is that the heat exchange capacity is less than or equal to the first preset heat exchange capacity, it can be determined that the heat exchange capacity between the coolant in the liquid cooling circuit and the outer layer of the molding object has reached the first preset heat exchange capacity, that is, the heat exchange capacity of the two is relatively low at this time. At this time, the speed of the driving motor of the water pump responsible for the circulation of the coolant can be reduced by controlling the water pump responsible for the circulation of the coolant, thereby reducing the flow of the coolant entering the liquid cooling circuit; or, a proportional valve can be set at the liquid inlet of the liquid cooling circuit to reduce the opening of the proportional valve to reduce the flow of the coolant entering the liquid cooling circuit.

[0060] It should be noted that, as the coolant flow rate decreases, since the heat exchange efficiency between the coolant and the outer layer of the molding object is proportional to the coolant flow rate, at this time, on the one hand, the heat exchange efficiency between the outer layer of the molding object and the coolant decreases, but on the other hand, the end face can quickly exchange heat with the high temperature of its deeper internal layer (i.e., the inner layer away from the mold cavity), so that the temperature of the outer layer of the molding object can quickly return to a higher temperature under the action of the high temperature of its deeper internal layer. Since the temperature of the outer layer of the molding object is again significantly different from the temperature of the coolant after heating, the heat exchange capacity between the coolant and the outer layer of the molding object can be increased again.

[0061] It can be understood that if the comparison result is that the heat exchange capacity is greater than the first preset heat exchange capacity, it can be determined that the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object has not reached the first preset heat exchange capacity, that is, at this time the heat exchange capacity of the two is still relatively high, and the coolant flow rate entering the liquid cooling pipeline can continue to be maintained at the initial flow rate.

[0062] In step S400, due to the increase in the temperature of the molding object, the temperature difference between it and the coolant with a lower flow rate at this time will increase rapidly, so that the calculated heat exchange capacity will also increase. Therefore, during the execution of step S300, the heat exchange capacity continuously determined in step S100 can be compared with the third preset heat exchange capacity. When the comparison result is that the heat exchange capacity is greater than or equal to the third preset heat exchange capacity, it can be determined that the heat exchange capacity after the increase reaches the higher third preset heat exchange capacity.

[0063] In this embodiment, the absolute value of the difference between the third preset heat exchange capacity and the second preset heat exchange capacity is less than the absolute value of the difference between the third preset heat exchange capacity and the first preset heat exchange capacity. In other words, the third preset heat exchange capacity is closer to the second preset heat exchange capacity than the first preset heat exchange capacity. Such a setting can better save equipment energy consumption. In a specific embodiment, the third preset heat exchange capacity can be 70%.

[0064] In step S500, when the heat exchange capacity after executing step S300 reaches the third preset heat exchange capacity, it means that the temperature of the molding object has risen to a higher temperature again, but has not reached the high temperature of the inner layer of the molding object for heat exchange, so that the temperature of the outer layer of the molding object can be at a higher and deeper high temperature level inside. At this time, the water pump can be controlled to increase the flow rate of the liquid cooling pipeline. Since the temperature of the molding object has recovered to a higher temperature level at this time, after the higher flow of coolant is re-introduced, a larger temperature difference can be formed with the temperature of the molding object again, so that the coolant can pass through the molding object to perform heat exchange with the deeper layer inside it. At this time, it is still monitored and judged whether the first preset heat exchange capacity is reached again according to the heat exchange capacity determined in step S100, and steps S200 to S500 are repeatedly executed according to the judgment result. In an optional embodiment, the coolant flow rate can be directly increased to the initial flow rate in step S500 to simplify the algorithm design.

[0065] This cycle is repeated until the liquid cooling process of the molded object is completed, which can ensure that all layers of the molded object are fully cooled by liquid cooling, thereby avoiding the phenomenon that the molded object is affected by the low-temperature coolant and cannot fully dissipate the heat deeper inside the molded object, and further solving the problem that the lower the coolant temperature, the lower the heat dissipation capacity will be, resulting in a high defective rate of the molded object.

[0066] It should be noted that although the traditional technology can also achieve the problem of sufficient heat dissipation of the molding object by extending the liquid cooling time of each molding object, due to the extremely low heat exchange capacity between the A layer and the coolant, the time required to fully cool each layer of the molding object is often extended to 2 times or more of the original liquid cooling time, which undoubtedly greatly drags down the mass production efficiency of the molding object. The technical solution of the present invention can achieve a better liquid cooling effect than the traditional technical solution with only 0.8 times the original liquid cooling time, which greatly improves the production quality and capacity of the molding object compared to the traditional technical solution.

[0067] In addition, in theory, further increasing the coolant flow rate in step S300 can also achieve the effect of improving the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object. However, since the initial flow rate of the coolant is often already very high, further increasing the flow rate not only requires replacing the water pump that supports a higher motor speed, but also puts forward certain requirements for the working stability of the entire liquid cooling system under high flow conditions. It is often necessary to install a lot of vibration reduction devices to stabilize the liquid cooling system, which is costly. However, the present technical solution can achieve the purpose of improving the heat exchange capacity by reducing the coolant flow rate. It only needs to reduce the speed of the motor in the water pump or control the opening of the proportional valve. The modification of the liquid cooling system is minimal, or even no modification is required, which is more suitable for application in actual production.

[0068] Reference Figure 3 The step S100 of determining the heat exchange capacity between the coolant in the liquid cooling circuit and the outer layer of the molding object comprises:

[0069] Step S110, obtaining an average liquid temperature of the coolant in the liquid cooling pipeline and an average end surface temperature of the outer layer of the molding object;

[0070] Step S120, determining the heat exchange capacity between the coolant in the liquid cooling circuit and the outer layer of the molding object according to the initial temperature of the coolant, the initial temperature of the molding object, the average liquid temperature and the average end surface temperature.

[0071] In step S110, the liquid cooling pipeline can be pre-divided into multiple sections, and a first temperature sensor is set in each section of the liquid cooling pipeline. Each first temperature sensor is used to detect the temperature of the coolant flowing through each section of the liquid cooling pipeline. The average liquid temperature of the coolant in the liquid cooling pipeline can be obtained by averaging the temperature data fed back by all the first temperature sensors. Similarly, multiple second temperature sensors can be pre-set at positions close to the molding object in the mold. Each second temperature sensor is used to detect the temperature of the molding object during the molding process. The average end surface temperature of the molding object can be obtained by averaging the temperature data fed back by all the second temperature sensors.

[0072] In step S120, the initial temperature of the coolant can be obtained by calling the pre-stored initial temperature of the coolant, and the pre-stored liquid material temperature of the molding object can be called as the initial temperature of the molding object contacting the mold cavity end surface, and the maximum temperature difference between the initial temperature of the molding object obtained by the above call and the initial temperature of the coolant can be obtained by subtracting the determined average liquid temperature and the average end surface temperature to obtain the real-time temperature difference between the two, and then the real-time temperature difference and the maximum temperature difference are calculated by ratio, and the ratio calculation result can be used as the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object.

[0073] Optionally, refer to Figure 4 The step S300 of reducing the flow rate of the coolant entering the liquid cooling pipeline includes:

[0074] Step S310, obtaining a target flow rate of the coolant in the liquid cooling pipeline;

[0075] Step S320: according to the target flow rate, reduce the coolant flow rate entering the liquid cooling pipeline to the target flow rate.

[0076] In step S310, the target flow is the coolant flow connected to the liquid cooling pipeline after adjustment. The target flow can be input in real time by the operator through the interactive component; or it can be obtained by real-time matching based on the relevant information of the coolant and the relevant information of the molding object, which is not limited in this embodiment.

[0077] In step S320, the flow reduction amplitude can be calculated according to the difference between the target flow and the current flow, and then the flow reduction amplitude can be divided by the cross-sectional area of ​​the liquid cooling pipeline to obtain the flow velocity reduction amplitude of the coolant; then, the speed reduction required for the motor in the water pump can be calculated according to the flow velocity reduction amplitude, or the opening size required to be reduced can be calculated accordingly, and according to the calculation result, the motor in the water pump can be controlled to reduce the corresponding speed or the corresponding opening can be controlled to reduce the corresponding degree, thereby reducing the flow of the coolant to the target flow.

[0078] Optionally, the step S310 of obtaining a target flow rate of the coolant in the liquid cooling pipeline includes:

[0079] Step S311, obtaining the adjustment time and the current flow rate of the coolant in the liquid cooling pipeline;

[0080] Step S312, calculating the flow change of the coolant according to the first preset heat exchange capacity, the third preset heat exchange capacity, the initial temperature of the coolant, the initial temperature of the molding object, the current flow of the coolant and the adjustment time;

[0081] Step S313: determine the target flow rate of the coolant according to the flow rate change and the current flow rate.

[0082] In step S311, the adjustment time can be obtained by calling a preset time, or can also be set in real time by the operator through the interactive component. A flow sensor can be provided in the liquid cooling pipeline to detect the flow of the coolant therein, so the current flow can be obtained by receiving the flow data fed back by the flow sensor.

[0083] In step S312, the third preset heat exchange capacity and the first preset heat exchange capacity can be firstly calculated to obtain the heat exchange capacity change range, and the initial temperature of the coolant and the initial temperature of the molding object can be calculated to obtain the maximum temperature difference, and then the heat exchange capacity change range and the maximum temperature difference can be multiplied to obtain the temperature change value. Finally, the current flow rate, temperature change value and adjustment time are substituted into the corresponding calculation formula (such as the preset temperature-flow rate conversion formula), and the flow rate change amount required to achieve the temperature change value (that is, to increase the first preset heat exchange capacity to the third preset heat exchange capacity) based on the current flow rate during the adjustment time can be calculated.

[0084] In step S313, the sum of the current flow rate and the flow rate change can be used as the target flow rate of the coolant.

[0085] Reference Figure 5 , step S400 of again determining whether the heat exchange capacity between the coolant in the liquid cooling circuit and the molding object reaches a third preset heat exchange capacity, comprises:

[0086] Step S410, determining whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the molding object reaches a third preset heat exchange capacity within a preset time period;

[0087] Step S420: if the heat exchange capacity reaches the third preset heat exchange capacity within the preset time, then the flow rate of the coolant entering the liquid cooling pipeline is increased, and the process returns to the step of determining whether the heat exchange capacity reaches the first preset heat exchange capacity;

[0088] Step S430: If the heat exchange capacity does not reach the third preset heat exchange capacity within the preset time, an ejection request instruction is output to the ejection mechanism, so that the ejection mechanism ejects the molded object in the mold cavity and restores the flow rate of the coolant in the liquid cooling pipeline to the initial flow rate.

[0089] It should be noted that, as steps S100 to S500 are repeated, the temperature of the inner layer of the molding object will become lower and lower, making it more difficult for the heat exchange capacity of the coolant and the outer layer of the molding object to continue to rise to the third preset heat exchange capacity. Therefore, the technical solution can start timing after reducing the coolant flow rate, and can compare the heat exchange capacity with the third preset heat exchange capacity in real time during the timing duration, and compare the timing duration with the preset duration, to determine whether the heat exchange capacity reaches the third preset heat exchange capacity within the preset duration.

[0090] If the comparison result is: the heat exchange capacity increases to the third preset heat exchange capacity when the timing duration is less than the preset duration, it can be determined that the heat exchange capacity reaches the third preset heat exchange capacity within the preset duration. At this time, it means that the temperature of the inner layer of the molding object is still high, then continue to execute step S400 to perform liquid cooling on the molding object.

[0091] If the comparison result is: the heat exchange capacity has not increased to the third preset heat exchange capacity before the timing duration is equal to the preset duration, it can be determined that the heat exchange capacity has not reached the third preset heat exchange capacity within the preset duration, which means that the temperature of the inner layer of the molding object is already low and the molding object has basically been cooled. At this time, an ejection request instruction can be sent to the ejection mechanism to trigger the ejection mechanism to eject the cooled molding object from the mold cavity (i.e., demolding), and at the same time, the speed of the motor in the water pump or the opening of the proportional valve is restored to the initial speed or initial opening, so as to restore the flow rate of the coolant to the initial flow rate, and wait for the molding object in liquid form to be re-injected into the mold cavity before repeating the technical solution of the present invention.

[0092] The technical solution of the present invention triggers the ejection operation by utilizing the dynamic judgment result of the heat exchange capacity, which is more in line with the actual cooling state of each molded object and can ensure that each ejected molded object is in a basically cooled state. Compared with the traditional solution of performing the ejection operation after a period of liquid cooling, it can not only save the liquid cooling time of a single molded object, but also help to further reduce the defective rate of the molded object after ejection.

[0093] The invention also discloses a mold cooling liquid flow control device.

[0094] Reference Figure 6 , the mold cooling liquid flow control device comprises:

[0095] Memory; storage is used to store programs;

[0096] Processor; The processor is used to execute the steps of the above-mentioned mold cooling liquid flow control method by calling the mold cooling liquid flow control program stored in the memory.

[0097] The specific steps of the mold cooling liquid flow control refer to the above embodiments. Since the control device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The memory 11 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 11 can also be a storage device independent of the above control device; the processor 12 can be a CPU. The memory 11 and the processor 12 are connected by a communication bus 13, which can be a UART bus or an I2C bus.

[0098] The present invention also proposes a mold cooling liquid flow control system, which includes a mold cooling liquid flow control device. The specific structure of the control device refers to the above-mentioned embodiment. Since the mold cooling liquid flow control system adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0099] The present invention also provides a storage medium, wherein a program is stored on the storage medium, and when the program is executed by a processor, the steps of the mold cooling liquid flow control method as described above are implemented. The specific steps of the mold cooling liquid flow control can refer to the above embodiments. Since the storage medium can implement all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0100] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for controlling the flow rate of a mold cooling liquid, wherein the cooling liquid is used to cool a molded object in a mold cavity, so that the molded object has an outer layer portion in contact with the mold cavity, characterized in that: The mold cooling liquid flow control method comprises: Determine the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object; the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object is the ratio of the real-time temperature difference between the two and the maximum temperature difference between the two; Determining whether the heat exchange capacity reaches a first preset heat exchange capacity; If the heat exchange capacity reaches the first preset heat exchange capacity, the flow rate of the coolant entering the liquid cooling pipeline is reduced to increase the temperature of the outer layer of the molding object; again determining whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the outer layer of the molding object reaches a third preset heat exchange capacity; and, If the heat exchange capacity reaches the third preset heat exchange capacity, the flow rate of the coolant entering the liquid cooling pipeline is increased, and the process returns to the step of determining whether the heat exchange capacity reaches the first preset heat exchange capacity; Among them, the first preset heat exchange capacity is smaller than the third preset heat exchange capacity, the third preset heat exchange capacity is smaller than the second preset heat exchange capacity, and the second preset heat exchange capacity is the heat exchange capacity of the coolant with the outer layer of the molding object at the initial temperature and initial flow rate.

2. The mold cooling liquid flow control method according to claim 1, characterized in that: The step of determining the heat exchange capacity between the coolant in the liquid cooling circuit and the outer portion of the molding object comprises: Obtaining an average liquid temperature of the coolant in the liquid cooling pipeline and an average end surface temperature of the outer layer of the molding object; The heat exchange capacity between the coolant in the liquid cooling circuit and the outer layer of the molding object is determined based on the initial temperature of the coolant, the initial temperature of the molding object, the average liquid temperature and the average end surface temperature.

3. The mold cooling liquid flow control method according to claim 2, characterized in that: Steps to reduce the coolant flow into the cooling circuit include: Obtaining a target flow rate of coolant in a liquid cooling pipeline; According to the target flow rate, the coolant flow rate entering the liquid cooling line is reduced to the target flow rate.

4. The mold cooling liquid flow control method according to claim 3, characterized in that: The steps of obtaining a target flow rate of the coolant in the liquid cooling pipeline include: Get the adjustment time and the current flow rate of the coolant in the liquid cooling line; Calculating a flow rate change of the coolant according to the first preset heat exchange capacity, the third preset heat exchange capacity, the initial temperature of the coolant, the initial temperature of the molding object, the current flow rate of the coolant, and the adjustment time; The target flow rate of the coolant is determined based on the flow rate change and the current flow rate.

5. The mold cooling liquid flow control method according to claim 4, characterized in that: The step of calculating the flow change of the coolant according to the first preset heat exchange capacity, the third preset heat exchange capacity, the initial temperature of the coolant, the initial temperature of the molding object and the adjustment time is specifically: The third preset heat exchange capacity is calculated as a difference with the first preset heat exchange capacity to obtain a heat exchange capacity difference, the initial temperature of the coolant and the initial temperature of the molding object are calculated as a difference to obtain a maximum temperature difference, the heat exchange capacity difference and the maximum temperature difference are multiplied to obtain a temperature change value, and the temperature change value, the adjustment time, and the current flow rate are substituted into a preset temperature-flow rate conversion formula to obtain the flow rate change.

6. The mold cooling liquid flow control method according to claim 1, characterized in that: Steps to increase the coolant flow rate into the liquid cooling line include: Increase the coolant flow rate to the initial flow rate.

7. The mold cooling liquid flow control method according to any one of claims 1 to 6, characterized in that: The step of again determining whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the molding object reaches a third preset heat exchange capacity comprises: Determining whether the heat exchange capacity between the coolant in the liquid cooling pipeline and the molding object reaches a third preset heat exchange capacity within a preset time period; If the heat exchange capacity reaches the third preset heat exchange capacity within the preset time, then the flow rate of the coolant entering the liquid cooling pipeline is subsequently increased, and the process returns to the step of determining whether the heat exchange capacity reaches the first preset heat exchange capacity; If the heat exchange capacity does not reach the third preset heat exchange capacity within the preset time, an ejection request instruction is output to the ejection mechanism, so that the ejection mechanism ejects the molded object in the mold cavity and restores the flow rate of the coolant in the liquid cooling pipeline to the initial flow rate.

8. A mold cooling liquid flow control device, characterized in that: The mold cooling liquid flow control device comprises: Memory; storage is used to store programs; Processor; The processor is used to execute the steps of the mold cooling liquid flow control method according to any one of claims 1 to 7 by calling the mold cooling liquid flow control program stored in the memory.

9. A mold cooling liquid flow control system, characterized in that: The mold cooling liquid flow control system comprises the mold cooling liquid flow control device as claimed in claim 8.

10. A storage medium, characterized in that: The storage medium stores a mold cooling liquid flow control program, and when the mold cooling liquid flow control program is executed by the processor, the steps of the mold cooling liquid flow control method according to any one of claims 1 to 7 are implemented.

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