Temperature control auxiliary demolding control method and system, intelligent terminal and storage medium

Abstract

The invention relates to a temperature control auxiliary demolding control method and system, an intelligent terminal and a storage medium, and relates to the technical field of injection molding.The method comprises the steps that in response to an injection molding completion signal, a cooling medium is introduced into a temperature control runner of a fixed mold core at a first speed; after the preset cooling duration, a cooling medium is introduced into the temperature control runner of the fixed mold core at a second rate, and the second rate is larger than the first rate; in response to the mold opening permission instruction, controlling the injection mold to execute a mold opening action; the injection mold is controlled to execute the demolding action, and the injection-molded part is ejected out of the movable mold core; in the process of executing the mold opening action and the demolding action, a heating medium is introduced into a temperature control runner of the fixed mold core so as to return the temperature of the fixed mold core; and after the temperature of the fixed mold core reaches the preset injection molding temperature, the injection mold is controlled to execute the next injection molding operation. According to the invention, under the condition that the pattern draft is not set, the probability of clamping stagnation or strain in the process that the injection molding part is separated from the mold cavity can be reduced.

Description

Technical Field

[0001] This application relates to the field of injection molding technology, and in particular to a temperature-controlled assisted demolding control method, system, smart terminal, and storage medium. Background Technology

[0002] Injection molding is a molding process in which molten plastic is injected into a mold cavity and solidified after cooling to form a product of a predetermined shape. It has the advantages of high molding efficiency, good dimensional accuracy and suitability for mass production, and is therefore widely used in the production of various plastic products.

[0003] Currently, in the injection molding field, to ensure smooth ejection of the molded part from the mold cavity, the product structure typically needs to be adapted during the mold design stage. A common approach is to set a draft angle on the sidewalls of the injection molded part or the corresponding cavity surface, creating a gradually expanding ejection space in the mold opening direction. This reduces frictional resistance between the injection molded part and the cavity, preventing jamming or tearing during demolding. However, while setting a draft angle can improve demolding performance to some extent, it also limits the structural form of the injection molded part. For example, in products with high requirements for dimensional accuracy or internal space utilization, setting a draft angle can cause changes in the sidewall thickness, resulting in a gradual change in wall thickness and affecting the product's structural uniformity. Furthermore, uneven wall thickness can easily lead to increased material usage, thereby increasing production costs. Summary of the Invention

[0004] In order to reduce the probability of jamming or tearing of injection molded parts during the process of detaching from the mold cavity without setting draft angle, this application provides a temperature-controlled assisted demolding control method, system, smart terminal and storage medium.

[0005] In a first aspect, this application provides a temperature-controlled assisted demolding control method, which adopts the following technical solution: A temperature-controlled assisted demolding control method includes: In response to the injection completion signal, a cooling medium is introduced into the temperature control channel of the mold core at a first rate to cool the mold core and thus cool the injection molded part. After a preset cooling time, a cooling medium is introduced into the temperature control channel of the mold core at a second rate to cool and shrink the injection molded part, wherein the second rate is greater than the first rate. In response to the mold opening permission command, the injection mold is controlled to perform the mold opening action, so that the injection molded part is separated from the fixed mold core; Control the injection mold to perform the demolding action, ejecting the injection molded part from the moving mold core; During the demolding process, a heating medium is introduced into the temperature control channel of the mold core to reheat the mold core. Once the temperature of the mold core reaches the preset injection temperature, the injection mold is controlled to perform the next injection operation.

[0006] By adopting the above technical solution, the cooling rate is increased in stages after injection molding, allowing the injection molded part to form sufficient volume shrinkage without setting a draft angle, thereby actively reducing the tightness and adhesion between it and the fixed mold core; and the fixed mold core is warmed up during demolding, so that the contact interface changes from a low temperature and high adhesion state to a relatively low adhesion state, thereby reducing the release resistance, avoiding local adhesion and stress concentration, and thus effectively reducing the probability of jamming or tearing of the injection molded part during the release of the mold cavity.

[0007] Optionally, obtain the current temperature data of the fixed model core; The predicted shrinkage of the injection molded part is obtained based on the current temperature data and the material thermal shrinkage parameters of the injection molded part. The predicted separation gap between the injection molded part and the fixed mold core is calculated based on the predicted shrinkage and the cavity size parameters of the fixed mold core. The predicted separation gap is compared with the preset demolding gap threshold to obtain the interface separation determination result; When the interface separation determination result meets the preset demolding gap threshold, a mold opening permission command is generated; After generating the mold opening permission command, a heating medium is introduced into the temperature control channel of the mold core; Continue to supply cooling medium into the temperature-controlled flow channel of the mold core when no mold opening permission instruction is generated.

[0008] By adopting the above technical solution, the shrinkage amount of the injection molded part and the predicted separation gap between the injection molded part and the cavity are calculated by acquiring the current temperature data of the mold core and combining it with the material thermal shrinkage parameters of the injection molded part. This transforms the demolding timing, which originally relied on experience-based judgment, into a quantitative judgment based on physical parameters, thereby improving the accuracy of the interface separation state judgment. Furthermore, by comparing the predicted separation gap with the preset demolding gap threshold to control the generation of the mold opening permission command, premature mold opening when separation is insufficient can be avoided, thereby improving the reliability of the demolding process. At the same time, the cooling or reheating process is adaptively switched according to the judgment result, making the demolding control more stable.

[0009] Optionally, the temperature-controlled flow channel includes a first flow channel located in the draft zone and a second flow channel located in the non-draft zone; the method further includes: Obtain the structural information of the injection molded part, and determine the draft area and non-draft area of ​​the injection molded part based on the structural information; Obtain the ratio of the draft area to the non-draft area; Determine if the area ratio is greater than the preset upper limit ratio; If not, the flow rate of the cooling medium into the temperature control channel is obtained based on the area ratio. The first regulating valve of the first flow channel and the second regulating valve of the second flow channel are adjusted according to the flow rate ratio. If so, the first flow channel is adjusted according to the preset flow adjustment method.

[0010] By adopting the above technical solution, the temperature control channel is divided into a first channel located in the draft area and a second channel located in the non-draft area. Based on the structural information of the injection molded part, the area ratio of the draft area to the non-draft area is calculated. Thus, the flow rate of the cooling medium is determined according to the proportional relationship of different structural areas, achieving differentiated control of the cooling intensity of different areas. When the area ratio is within a reasonable range, the flow distribution of the first and second channels is coordinated to make the shrinkage of each area more balanced, avoiding insufficient or excessive shrinkage in some areas. When the area ratio is large, the first channel is adjusted in a targeted manner to enhance the cooling effect of key areas, thereby improving the uniformity and stability of the demolding process.

[0011] Optionally, the first flow channel includes a plurality of sub-flow channels evenly spaced along the cavity depth direction of the fixed mold core; the adjustment of the first flow channel according to a preset flow adjustment method includes: Extract the thickness distribution data of the injection molded part along the cavity depth direction in the draft zone based on the structural information of the injection molded part; Determine the local volume parameters corresponding to each depth location based on the thickness distribution data; The predicted shrinkage at each depth is calculated based on local volume parameters and the thermal shrinkage parameters of the injection molded part material. The shrinkage difference distribution of the injection molded part along the cavity depth direction is calculated based on the predicted shrinkage at each depth position; The cooling compensation requirements at each depth location are determined based on the shrinkage difference distribution; The cooling compensation requirements at each depth position are matched with the sub-channels corresponding to the depth position to obtain the target cooling adjustment parameters for each sub-channel. Adjust the opening of the regulating valves of each sub-channel according to the target cooling adjustment parameters to make the cooling intensity distributed in a gradient along the cavity depth direction.

[0012] By adopting the above technical solution, the first flow channel is divided into multiple sub-flow channels distributed along the cavity depth direction. Combined with the thickness gradient characteristics of the injection molded part along the depth direction, the sub-flow channels are differentiated and adjusted so that the cooling intensity forms a gradient distribution that matches the thickness change. This achieves targeted control of the shrinkage process, reduces shrinkage differences caused by uneven thickness, and improves the stability of the demolding process.

[0013] Optionally, before the injection mold performs the mold opening action, cold air is introduced into the cavity of the mold core; After a preset cooling time by cold airflow, the injection mold is controlled to perform the mold opening action; When the mold opening degree reaches the first preset mold opening degree, the mold opening action is paused, so that a mold opening gap is formed between the fixed mold core and the moving mold core for the cooling air to escape. Cold air is continuously introduced into the cavity of the mold core, so that the cold air flows through the surface of the injection molded part and then flows out from the mold opening gap; In response to the injection molded part meeting the preset mold opening conditions, the mold opening action is resumed.

[0014] By adopting the above technical solution, cold air is introduced into the cavity before and during mold opening, and a controllable mold opening gap is formed in the early stage of mold opening. This allows the cold air to flow along the surface of the injection molded part and effectively remove heat, thereby continuously enhancing the surface cooling effect during mold opening. At the same time, through the synergistic effect of staged mold opening and cold air, the interface between the injection molded part and the cavity is gradually separated, avoiding stress concentration caused by instantaneous demolding. This helps to reduce the risk of jamming and surface scratches and improves the smoothness of the demolding process.

[0015] Optionally, obtain a thermal map of the airflow distribution at the mold opening gap; Based on the airflow distribution heat map, the region where the airflow outflow is lower than the preset flow rate threshold is identified, and this region is defined as the airflow gap region; Calculate the width ratio of the airflow gap area to the corresponding area of ​​the overall mold opening gap; Compare the width ratio with the preset ratio threshold; When the width ratio is not greater than the preset ratio threshold, the injection molded part is determined to meet the preset mold opening conditions; When the width ratio is greater than the preset ratio threshold, the injection molded part is determined not to meet the preset mold opening conditions.

[0016] By adopting the above technical solution, the airflow distribution at the mold opening gap is detected, and the area with insufficient airflow is defined as the airflow gap area. The width ratio of the gap is used to characterize the degree of interface separation, thereby intuitively reflecting whether there is local adhesion or insufficient separation between the injection molded part and the cavity. Based on the comparison of this ratio with a preset threshold, the mold opening conditions can be accurately determined, avoiding the continuation of mold opening when the parts have not yet separated, and effectively reducing the risk of jamming or tearing during the demolding process.

[0017] Optionally, when the injection molded part does not meet the preset mold opening conditions, the distribution side position of the airflow gap area is determined according to the airflow distribution heat map; The distribution side location is matched with the sub-channel to determine the target sub-channel corresponding to the distribution side location; Increase the opening degree of the regulating valve corresponding to the target sub-flow channel; Lower the temperature of the cold airflow and control the cold airflow to enter the cavity of the mold core in a pulsed manner; The preset mold opening conditions are determined in real time based on the airflow distribution thermal map until the injection molded part meets the preset mold opening conditions.

[0018] By adopting the above technical solution, targeted adjustments are made by locating the airflow gap area and matching the corresponding sub-channel. At the same time, the local cooling and impact effects are enhanced by combining low-temperature pulsed airflow, which achieves precise intervention in the insufficiently separated area. The system is continuously optimized through real-time judgment until the mold opening conditions are met, thereby improving the stability of the demolding process.

[0019] Secondly, this application provides a temperature-controlled assisted demolding control system, which adopts the following technical solution: A temperature-controlled assisted demolding control system, comprising: The acquisition module is used to acquire the temperature of the fixed model core; A memory for storing the program of the temperature-controlled assisted demolding control method; The processor and the program in the memory can be loaded and executed by the processor to implement the temperature-controlled assisted demolding control method.

[0020] By adopting the above technical solution, the cooling rate is increased in stages after injection molding, allowing the injection molded part to form sufficient volume shrinkage without setting a draft angle, thereby actively reducing the tightness and adhesion between it and the fixed mold core; and the fixed mold core is warmed up during demolding, so that the contact interface changes from a low temperature and high adhesion state to a relatively low adhesion state, thereby reducing the release resistance, avoiding local adhesion and stress concentration, and thus effectively reducing the probability of jamming or tearing of the injection molded part during the release of the mold cavity.

[0021] Thirdly, this application provides a smart terminal, which adopts the following technical solution: A smart terminal includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of the above methods.

[0022] Fourthly, this application provides a computer storage medium capable of storing corresponding programs, which facilitates reducing the probability of jamming or tearing of the injection molded part during its removal from the mold cavity without setting a draft angle. The technical solution adopted is as follows: A computer-readable storage medium storing a computer program that can be loaded by a processor and executed by any of the above-described temperature-controlled assisted demolding control methods.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By increasing the cooling rate in stages after injection molding, the injection molded part can achieve sufficient volume shrinkage without setting a draft angle, thereby actively reducing the tightness and adhesion between it and the fixed mold core; and during the demolding process, the fixed mold core is reheated, so that the contact interface changes from a low temperature and high adhesion state to a relatively low adhesion state, thereby reducing the release resistance, avoiding local adhesion and stress concentration, and thus effectively reducing the probability of jamming or tearing of the injection molded part during the release of the mold cavity; 2. By dividing the temperature-controlled runner into a first runner located in the draft zone and a second runner located in the non-draft zone, and calculating the area ratio of the draft area to the non-draft area based on the structural information of the injection molded part, the flow rate of the cooling medium is determined according to the proportional relationship of different structural areas, thereby achieving differentiated control of the cooling intensity of different areas. When the area ratio is within a reasonable range, the flow distribution of the first and second runners is coordinated to make the shrinkage of each area more balanced, avoiding insufficient or excessive shrinkage in some areas. When the area ratio is large, the first runner is adjusted in a targeted manner to enhance the cooling effect of key areas, thereby improving the uniformity and stability of the demolding process. 3. By dividing the first flow channel into multiple sub-flow channels distributed along the cavity depth direction, and combining the thickness gradient characteristics of the injection molded part along the depth direction, the sub-flow channels are differentiated and adjusted so that the cooling intensity forms a gradient distribution that matches the thickness change, thereby achieving targeted control of the shrinkage process, reducing shrinkage differences caused by uneven thickness, and improving the stability of the demolding process. Attached Figure Description

[0024] Figure 1 This is a schematic flowchart of a temperature-controlled assisted demolding control method according to an embodiment of this application.

[0025] Figure 2 This is a flowchart illustrating a method for generating a mold opening permission instruction in an embodiment of this application.

[0026] Figure 3 This is a flowchart illustrating a flow regulation method according to an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the process of adjusting the first flow channel according to a preset flow adjustment method in an embodiment of this application.

[0028] Figure 5 This is a schematic flowchart of a cold airflow-assisted cooling method in an embodiment of this application.

[0029] Figure 6 This is a flowchart illustrating a method for determining preset mold opening conditions in an embodiment of this application.

[0030] Figure 7 This is a schematic flowchart of a second method for cold airflow-assisted cooling in an embodiment of this application. Detailed Implementation

[0031] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1 -Appendix Figure 7 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0032] This application discloses a temperature-controlled assisted demolding control method. (Refer to...) Figure 1 Temperature-controlled assisted demolding control methods include: Step S101: In response to the injection completion signal, a cooling medium is introduced into the temperature control channel of the mold core at a first rate to cool the mold core and allow the injection molded part to cool down and form.

[0033] The injection completion signal is a status indication signal generated by the injection mold control system after the injection mold has completed the filling and holding pressure stages of molten plastic. This signal is used to indicate that the molten plastic has filled the cavity and completed the holding pressure process, and can enter the cooling stage.

[0034] A temperature-controlled flow channel is a medium flow channel located inside the mold core and arranged around the cavity. It is used to deliver cooling or heating media into the mold core during the injection molding process, thereby regulating the temperature of the mold core and controlling the cooling rate of the injection molded part.

[0035] The first rate refers to the flow rate of the cooling medium when it enters the temperature control channel. This rate is used to control the initial cooling intensity of the cooling medium on the mold core, so that the injection molded part gradually cools down under a relatively stable temperature gradient.

[0036] Cooling medium refers to a fluid medium that can absorb heat and reduce the temperature of the mold, such as cooling water, cryogenic oil, coolant, or other fluids with good thermal conductivity.

[0037] Step S102: After a preset cooling time, a cooling medium is introduced into the temperature control channel of the mold core at a second rate to cool and shrink the injection molded part, wherein the second rate is greater than the first rate.

[0038] The preset cooling time refers to the initial cooling time set by the system after injection molding. During this time period, the cooling medium is introduced at the first rate to gradually cool the injection molded part from a high-temperature molten state to a near-solid state, so as to avoid internal stress or surface defects caused by excessively rapid cooling.

[0039] The second rate refers to the second-stage flow rate of the cooling medium in the temperature-controlled flow channel. This rate is greater than the first rate and is used to increase the cooling intensity after the initial cooling is completed, so that the injection molded part is further cooled and produces significant volume shrinkage, thereby promoting the separation trend between the injection molded part and the fixed mold core.

[0040] Cooling shrinkage refers to the volume reduction phenomenon of injection molded parts as the temperature decreases due to the change in the coefficient of thermal expansion. This phenomenon causes the injection molded parts to gradually shrink inward from the cavity wall, thereby reducing the contact pressure between the injection molded parts and the mold.

[0041] Step S103: In response to the mold opening permission command, control the injection mold to perform the mold opening action, so that the injection molded part is separated from the fixed mold core.

[0042] A mold opening permission command is a control command generated by the system after determining that the injection molded part has met the conditions for demolding. This command notifies the injection molding machine control system that the mold opening action can be performed, thereby changing the mold from a closed state to an open state. The generation of the mold opening permission command can be found in [reference needed]. Figure 2 The steps in the embodiments.

[0043] The mold opening action refers to the mechanical movement process in which the injection molding machine drives the moving mold part to move along the mold opening direction, so that the moving mold and the fixed mold gradually separate. This process is usually completed by the injection molding machine's hydraulic system, electric servo system or mechanical drive mechanism.

[0044] As the moving mold moves, the cavity originally formed by the moving mold and the fixed mold is opened, and the contact state between the injection molded part and the fixed mold core changes. Since the injection molded part has already undergone a certain degree of shrinkage during the aforementioned cooling stage, it will gradually detach from the surface of the fixed mold core during the mold opening process, thereby achieving separation between the injection molded part and the fixed mold core.

[0045] Step S104: Control the injection mold to perform the demolding action, ejecting the injection molded part from the moving mold core.

[0046] Demolding refers to the mechanical process in which, after the mold has been opened, the ejector mechanism located on the moving mold side applies an ejection force to the injection molded part, causing the injection molded part to detach from the mold cavity.

[0047] Step S105: During the demolding process, a heating medium is introduced into the temperature control channel of the mold core to reheat the mold core.

[0048] Heating medium refers to a fluid medium that can transfer heat to the mold and increase the mold temperature, such as hot water, heat transfer oil, or steam. This medium is used in temperature control systems to heat or reheat the mold.

[0049] Warming refers to the process of gradually raising the mold temperature to a suitable level for the next injection molding operation by introducing a heating medium into the temperature-controlled flow channel after the mold has undergone a cooling phase.

[0050] During the demolding process, the system can simultaneously send a heating control command to the mold temperature control module, switching the supply of the cooling medium to a heating medium. Specifically, by switching the reversing valve in the pipeline, the heating medium enters the temperature-controlled flow channel of the mold core and circulates within it under the action of the circulating pump, thereby transferring heat to the mold core. Since forced cooling is usually not required during the demolding stage, the mold core can be warmed up during the demolding process, allowing the mold temperature to gradually return to a suitable range for the next injection molding, thus shortening the subsequent mold preheating time and improving overall injection molding production efficiency.

[0051] Step S106: After the temperature of the mold core reaches the preset injection temperature, control the injection mold to perform the next injection operation.

[0052] Preset injection temperature refers to the mold temperature range that is set in advance according to the material properties of the injection molded part and the requirements of the injection molding process. This temperature is used to ensure that the molten plastic can flow stably after entering the cavity and form injection molded parts with stable quality.

[0053] The next injection operation refers to the process of the injection molding machine re-executing the production process of injecting molten plastic into the mold cavity after the current injection cycle ends. This process usually includes stages such as mold closing, molten plastic injection, pressure holding, and subsequent cooling.

[0054] This application provides a method for generating mold opening permission instructions, referring to... Figure 2 The method includes: Step S201: Obtain the current temperature data of the fixed model core.

[0055] The current temperature data is the real-time temperature information of the specified mold core at the current injection molding stage. This temperature data is used to reflect the actual thermal state of the specified mold core.

[0056] This can be achieved by creating several detection holes within the mold core, near the mold cavity, and installing temperature detection devices, such as temperature sensors, within these holes. The current temperature data is obtained by averaging the temperature data acquired by these detection devices.

[0057] Step S202: Obtain the predicted shrinkage of the injection molded part based on the current temperature data and the material thermal shrinkage parameters of the injection molded part.

[0058] Material thermal shrinkage parameters are parameters used to characterize the dimensional shrinkage characteristics of injection molded materials during temperature reduction. These parameters can be provided by the material supplier or obtained through experiments, and they can reflect the shrinkage ratio of the material under unit temperature change conditions.

[0059] Predicted shrinkage refers to the shrinkage value calculated or estimated based on the current temperature state of the injection molded part and the thermal shrinkage characteristics of the material, which is used to reflect the degree of shrinkage of the injection molded part relative to the cavity size.

[0060] After obtaining the current temperature data of the mold core, a shrinkage calculation model can be established based on the thermal shrinkage parameters of the injection molded part material. Since the injection molded part shrinks in volume as the temperature decreases during cooling, the system can combine the temperature difference between the current temperature and the material's curing temperature, and use the material's thermal shrinkage parameters to calculate the potential shrinkage of the injection molded part within this temperature range. The calculated shrinkage can be used as a predicted shrinkage of the injection molded part in the current cooling stage, to assess the separation trend between the injection molded part and the mold cavity.

[0061] Step S203: Calculate the predicted separation gap between the injection molded part and the fixed mold core based on the predicted shrinkage amount and the cavity size parameters of the fixed mold core.

[0062] Cavity dimension parameters are the geometric dimensions of the cavity in the mold core used to form the outer shape of the injection molded part. These parameters may include the length, width, diameter, depth or other key dimensions of the cavity, which are used to characterize the spatial structural features of the cavity.

[0063] Predicted separation gap refers to the gap value that may form between the injection molded part and the cavity wall of the fixed mold core, calculated based on the relationship between the predicted shrinkage of the injection molded part during the cooling process and the cavity size. This gap is used to reflect the contact state and separation degree between the injection molded part and the mold.

[0064] After obtaining the predicted shrinkage of the injection molded part, the dimensional changes of the part can be estimated by combining the dimensional parameters of the mold core cavity. Since the injection molded part shrinks during cooling, its actual size will gradually become smaller than the cavity size. The system can subtract the predicted shrinkage size of the injection molded part from the cavity size to obtain the possible gap value between the injection molded part and the cavity wall; this gap value is the predicted separation gap. By calculating this gap, it can be determined whether the injection molded part has already shown a tendency to detach from the cavity wall during the current cooling stage.

[0065] Step S204: Compare the predicted separation gap with the preset demolding gap threshold to obtain the interface separation determination result.

[0066] The preset demolding clearance threshold is a minimum clearance parameter set in advance to determine whether the injection molded part can be successfully detached from the mold surface. When the clearance between the injection molded part and the mold cavity wall reaches or exceeds this threshold, it can usually be considered that the contact pressure between the injection molded part and the mold has been reduced to the level that allows the mold to open.

[0067] The interface separation determination result refers to the judgment conclusion obtained by comparing the predicted separation gap with the preset demolding gap threshold. It is used to characterize whether the interface separation condition between the injection molded part and the fixed mold core has been reached. The determination result can be either allowing mold opening or disallowing mold opening.

[0068] For example, in a certain injection molding process, the preset demolding gap threshold can be set to 0.5 mm. When the system calculates a predicted separation gap of 0.75 mm, the control system determines through comparison that this gap is greater than the preset demolding gap threshold, thus obtaining a result indicating that the demolding condition is met. Conversely, if the system calculates a predicted separation gap of only 0.3 mm, since this gap is less than the 0.5 mm threshold, the system will determine that a sufficient separation gap has not yet been formed between the injection molded part and the mold core, thus obtaining a result indicating that the demolding condition is not met.

[0069] Step S205: When the interface separation determination result meets the preset demolding gap threshold, generate a mold opening permission command.

[0070] When the system detects that the predicted separation gap has reached or exceeded the preset demolding gap threshold, it determines that a sufficient separation gap has been formed between the injection molded part and the mold core, and the contact pressure has significantly decreased. At this time, the control system generates a mold opening permission command and sends it to the injection mold control module. Upon receiving the command, the injection molding machine control module enters the mold opening preparation state, thereby executing the mold opening action in subsequent steps.

[0071] Step S206: After generating the mold opening permission instruction, introduce the heating medium into the temperature control flow channel of the mold core.

[0072] After the system generates a mold opening permission command based on the interface separation judgment result, it indicates that the injection molded part has met the conditions for separation from the surface of the mold core. At this time, the system can simultaneously send a heating control signal to the mold temperature control module, causing the temperature control module to switch the supply of cooling medium in the temperature control channel to heating medium. Specifically, the system controls the reversing valve in the pipeline to allow the heating medium to enter the temperature control channel of the mold core, and circulates inside the temperature control channel under the drive of the circulating pump, thereby heating the mold core and gradually raising its temperature. By preheating the mold before the mold opening action is executed, the temperature recovery time of the mold before the start of the next injection cycle can be shortened.

[0073] Step S207: Continue to supply cooling medium into the temperature control channel of the mold core when no mold opening permission instruction is generated.

[0074] After the interface separation determination is completed in step S204, if the system determines that the predicted separation gap is still less than the preset demolding gap threshold, it indicates that the injection molded part has not yet undergone sufficient shrinkage and is still in strong contact with the fixed mold core. In this case, the system will not generate a mold opening permission command. The control system will keep the temperature control module in cooling mode and continue to deliver cooling medium to the temperature control channel of the fixed mold core, causing the temperature of the fixed mold core to continue to drop. As the cooling medium continues to flow in the temperature control channel, the fixed mold core will further remove heat from the injection molded part, thereby causing the injection molded part to continue cooling and shrinking. After continuous cooling for a period of time, the system can obtain the current temperature data of the fixed mold core again and re-execute the subsequent shrinkage calculation and interface separation determination steps until the demolding conditions are met.

[0075] This application provides a flow regulation method, referring to... Figure 3 The method includes: Step S301: Obtain the structural information of the injection molded part, and determine the draft area and non-draft area of ​​the injection molded part based on the structural information.

[0076] Structural information refers to data used to characterize the geometric features of injection molded parts. This structural information may include the three-dimensional model data of the injection molded part, the spatial positional relationship of each surface, the mold opening direction, and the extension relationship of each surface in the mold opening direction, etc., and is used to describe the overall structural form of the injection molded part.

[0077] The draft area refers to the region within the molded part that may slide against the inner wall of the mold cavity and generate friction during the demolding process. This region typically has a certain length along the mold opening direction. During demolding, the molded part needs to move relative to the inner wall of the cavity along this region, thus generating frictional resistance. The area within the molded core corresponding to this region is defined as the draft area.

[0078] Non-draft area refers to the region that does not experience sliding friction along the cavity wall during mold opening. This region is typically located at the end of the mold opening direction. During mold opening, the molded part directly separates from the cavity surface corresponding to this region without sliding along the wall, thus generating virtually no demolding friction. The area within the fixed mold core corresponding to this region is defined as the non-draft area.

[0079] The temperature-controlled flow channel includes a first flow channel located in the draft zone and a second flow channel located in the non-draft zone.

[0080] For example, for an injection molded part with an inverted concave shape, its side wall has a certain height along the mold opening direction. During the mold opening process, the injection molded part needs to slide upward along the inner wall of the cavity corresponding to the side wall to complete the demolding. Therefore, this side area may rub against the inner wall of the cavity during the demolding process, and this side area can be determined as the draft area.

[0081] The top surface of the injection molded part is located at the end of the mold opening direction. When the mold opens, the top surface can be directly separated from the cavity surface without sliding along the cavity wall. Therefore, the top area will not generate demolding friction and can be identified as the non-demolding area.

[0082] Step S302: Obtain the area ratio of the draft area to the non-draft area.

[0083] The area ratio refers to the proportional relationship between the draft area and the non-draft area of ​​an injection molded part, reflecting the structural depth characteristics of the injection molded part in the mold opening direction. By calculating the ratio of these two types of areas, an area ratio that characterizes the structural morphology of the injection molded part can be obtained.

[0084] The area ratio reflects the structural characteristics of the injection molded part in the mold opening direction. When the draft area ratio is large, it indicates that the injection molded part has a large sidewall area in the mold opening direction, meaning that the injection molded part needs to slide a long distance along the inner wall of the cavity during demolding. Such injection molded parts usually have a deep structural form. When the non-draft area ratio is large, it indicates that the sidewall height of the injection molded part in the mold opening direction is small, and most areas can be directly detached from the cavity surface. Such injection molded parts usually belong to the shallow type.

[0085] In some embodiments, after obtaining the draft area A1 and the non-draft area A2, the control system can calculate the area ratio R, where R = A1 / A2. When the area ratio R is large, it indicates that the sidewall area of ​​the injection molded part is relatively large, requiring a longer sliding distance along the inner wall of the cavity during mold opening. Such injection molded parts are more susceptible to frictional resistance during demolding. Therefore, a stricter cooling control strategy can be adopted in the subsequent temperature control process to ensure more stable shrinkage of the injection molded part, thereby reducing demolding resistance. When the area ratio R is small, it indicates that the top or end face area of ​​the injection molded part is relatively large, while the sidewall height is small. The sliding distance along the inner wall of the cavity is shorter during mold opening. Such injection molded parts are less affected by friction during demolding. Therefore, the cooling control conditions can be appropriately relaxed during temperature control.

[0086] For example, for a certain inverted concave-shaped injection molded part, the area of ​​its sidewall region is 120 square centimeters and the area of ​​its top region is 40 square centimeters, then the area ratio is 3. This ratio indicates that the sidewall area is relatively large, and the injection molded part needs to slide a long distance along the inner wall of the cavity during the mold opening process. Therefore, this injection molded part belongs to a relatively deep structure type, and the shrinkage process needs to be more strictly controlled during the cooling stage.

[0087] For another type of shallow, disc-shaped injection molded part, with a sidewall area of ​​30 square centimeters and a top area of ​​150 square centimeters, the area ratio is 0.2. This ratio indicates that the sidewall height of this injection molded part is relatively small, and the sliding distance during mold opening is relatively short. Therefore, its demolding difficulty is lower, and the requirements for controlling cooling shrinkage are relatively lower.

[0088] Step S303: Determine whether the area ratio is greater than the preset upper limit ratio.

[0089] The preset upper limit ratio is a threshold parameter used to distinguish the structural form of injection molded parts. This parameter is used to determine whether the injection molded part has a large sidewall depth in the mold opening direction. By comparing the area ratio with this preset upper limit ratio, the structural type of the injection molded part can be determined.

[0090] When the area ratio is greater than the preset upper limit ratio, it indicates that the draft area of ​​the injection molded part is relatively high, which means that the side wall height of the injection molded part in the mold opening direction is relatively large, and it belongs to the structural type with a long sliding distance along the inner wall of the cavity. When the area ratio is less than or equal to the preset upper limit ratio, it indicates that the side wall area of ​​the injection molded part is relatively small, and it belongs to the structural type with a short mold opening sliding distance.

[0091] Step S304: If not, obtain the flow rate ratio of the cooling medium entering the temperature control channel based on the area ratio.

[0092] The flow rate ratio refers to the ratio of the flow rate of the cooling medium when it is introduced into the first flow channel and the second flow channel respectively. It is used to adjust the difference in cooling intensity between the draft zone and the non-draft zone.

[0093] In some embodiments, a correspondence table between area ratio and flow rate can be pre-established in the system. After obtaining the area ratio, the system can obtain the corresponding flow rate based on the table, thereby determining the flow rate ratio when the cooling medium is introduced into the first flow channel and the second flow channel respectively.

[0094] Step S305: Adjust the first regulating valve of the first flow channel and the second regulating valve of the second flow channel according to the flow rate ratio.

[0095] The first regulating valve is a flow regulating device installed on the liquid inlet pipe of the first flow channel. It is used to control the flow rate of the cooling medium into the first flow channel, thereby adjusting the cooling intensity of the cavity wall surface corresponding to the draft area.

[0096] The second regulating valve is a flow regulating device installed on the liquid inlet pipe of the second flow channel. It is used to control the flow rate of the cooling medium into the second flow channel, thereby adjusting the cooling intensity of the cavity wall surface corresponding to the non-draft area.

[0097] The flow rate ratio refers to the ratio of the flow rate of the cooling medium when it is introduced into the first flow channel and the second flow channel respectively.

[0098] After obtaining the flow rate ratio, a lookup operation can be performed according to the preset flow rate ratio-valve opening table to obtain the opening of the first and second regulating valves corresponding to the flow rate ratio, thereby adjusting the first and second regulating valves.

[0099] Step S306: If so, adjust the first flow channel according to the preset flow adjustment method.

[0100] The preset flow rate adjustment method refers to a control strategy pre-set for adjusting the flow rate of the cooling medium in the first runner, specifically for injection molded parts with a large draft area. For detailed steps, please refer to... Figure 4 Example.

[0101] Reference Figure 4 The first flow channel is adjusted according to a preset flow adjustment method, including: Step S401: Extract the thickness distribution data of the injection molded part along the cavity depth direction in the draft area based on the structural information of the injection molded part.

[0102] Thickness distribution data refers to the variation of wall thickness of injection molded parts at various locations along the cavity depth direction in the draft zone, and is used to reflect the thickness difference of the side wall structure of injection molded parts at different height positions.

[0103] The cavity depth direction refers to the spatial direction corresponding to the mold opening direction, that is, the direction of movement of the injection molded part when it leaves the cavity of the fixed mold core.

[0104] In some embodiments, the draft area can be analyzed using the three-dimensional model data of the injection molded part. Multiple cross-sectional positions can be set at preset intervals along the cavity depth direction, and the wall thickness of the corresponding sidewall of the injection molded part can be calculated at each cross-sectional position to obtain a set of thickness data sequences, which are the thickness distribution data.

[0105] For example, wall thickness data can be extracted at regular intervals to obtain wall thickness values ​​corresponding to multiple depth locations. By organizing this data, a thickness distribution dataset describing the thickness variation in the draft zone can be formed.

[0106] In another implementation, engineers can mark the thickness of the sidewall structure of the injection molded part during the mold design stage and store the thickness information in the process database. The control system can directly read these data during the production process to quickly obtain the thickness distribution data.

[0107] Step S402: Determine the local volume parameters corresponding to each depth position based on the thickness distribution data.

[0108] Local volume parameters refer to the volume occupied by the injection molded part material within a specific segment along the cavity depth direction in the draft zone. This parameter characterizes the volume of material at different depth locations, thus reflecting the heat required to be released during cooling and the potential shrinkage in that area.

[0109] Specifically, the draft area can be divided into several depth segments along the cavity depth direction, and the material volume within each segment can be calculated based on the wall thickness of each segment and the extension dimension of the segment in the circumferential or length direction, thereby obtaining the local volume parameters corresponding to each depth position.

[0110] Step S403: Calculate the predicted shrinkage at each depth position based on the local volume parameters and the thermal shrinkage parameters of the injection molded part material.

[0111] Predicted shrinkage refers to the expected dimensional shrinkage of a region at each depth during the cooling process of an injection-molded part under decreasing temperature conditions. This shrinkage is used to characterize the degree of shrinkage in that region before demolding.

[0112] Material thermal shrinkage parameters are parameters used to characterize the dimensional shrinkage characteristics of injection molded materials during temperature reduction. These parameters can be provided by the material supplier or obtained through experiments, and they can reflect the shrinkage ratio of the material under unit temperature change conditions.

[0113] We have already obtained the thickness distribution data of the draft zone along the cavity depth direction and the corresponding local volume parameters at each depth position. Since the material volume is different at different depth positions, the cooling rate will also be different, resulting in different temperature changes at each position.

[0114] In this system, areas with larger material volumes dissipate heat more slowly, resulting in a slower temperature drop; conversely, areas with smaller material volumes dissipate heat more quickly, leading to a relatively faster temperature drop. Therefore, the control system can estimate the temperature change during the cooling phase based on the local volume parameters at each depth location. Subsequently, by combining this with the thermal shrinkage parameters of the injection molded part material, the predicted shrinkage at each depth location can be calculated based on the temperature change, thus obtaining the shrinkage distribution of the injection molded part along the cavity depth direction in the draft zone.

[0115] By obtaining the temperature of the injection molded part at various depths, and multiplying the obtained temperature with the heat shrinkage parameter and the local volume parameter, the predicted shrinkage amount is obtained.

[0116] Step S404: Calculate the shrinkage difference distribution of the injection molded part along the cavity depth direction based on the predicted shrinkage at each depth position.

[0117] Shrinkage difference refers to the difference in predicted shrinkage between adjacent depth positions, and is used to characterize the degree of shrinkage difference between different positions along the cavity depth direction of the injection molded part.

[0118] Shrinkage difference distribution refers to the overall distribution of shrinkage difference between adjacent depth positions along the cavity depth direction, which is used to reflect the shrinkage gradient generated on the sidewall of the injection molded part during the cooling process.

[0119] The control system can compare the predicted shrinkage at each depth along the cavity depth direction and calculate the shrinkage difference between adjacent depths. For example, the predicted shrinkage at a certain depth can be subtracted from the predicted shrinkage at an adjacent depth to obtain the shrinkage difference for that section.

[0120] By calculating the shrinkage difference at all adjacent depth locations, the distribution of shrinkage difference along the cavity depth direction can be obtained. This shrinkage difference distribution can reflect the change in shrinkage gradient of the injection molded part's sidewall along the depth direction.

[0121] Step S405: Determine the cooling compensation requirements at each depth location based on the shrinkage difference distribution.

[0122] Cooling compensation requirement refers to the amount of cooling adjustment required to reduce the shrinkage difference of the injection molded part along the cavity depth direction by adjusting the local cooling intensity.

[0123] Since the sidewall thickness of injection molded parts usually decreases gradually from the inside of the cavity to the opening side, there are differences in the cooling rate and shrinkage at different depths. When the shrinkage difference between adjacent positions is large, it can easily lead to a large change in contact pressure between the local area and the mold during demolding, thereby increasing the demolding resistance.

[0124] Therefore, the control system can determine whether there is a need for cooling adjustment in a given area based on the shrinkage difference at each depth position.

[0125] Specifically, the shrinkage difference in each depth segment can be compared with a preset shrinkage difference threshold: When the shrinkage difference is less than or equal to the shrinkage difference threshold, it indicates that the shrinkage change in this region is relatively gentle and no additional cooling compensation is required. When the shrinkage difference is greater than the shrinkage difference threshold, it indicates that there is a significant shrinkage gradient change in this region, and the cooling conditions in this region need to be adjusted to reduce the shrinkage difference.

[0126] Subsequently, the system can determine the cooling compensation requirements corresponding to each depth position based on the magnitude of the shrinkage difference and the corresponding depth position. For example, it can increase the cooling intensity, decrease the cooling intensity, or maintain the original cooling state, thereby forming a distribution of cooling compensation requirements along the cavity depth direction.

[0127] Step S406: Match the cooling compensation requirements at each depth position with the sub-channels corresponding to the depth position to obtain the target cooling adjustment parameters for each sub-channel.

[0128] The target cooling regulation parameter refers to the control parameter used to adjust the cooling capacity of the sub-channel, which is determined according to the cooling compensation requirements. This parameter may include at least one of the following: cooling medium flow rate, flow velocity, temperature, or on / off state.

[0129] Specifically, the control system can match the cooling compensation requirements at each depth location with the corresponding sub-channels based on the positional relationship along the cavity depth direction. For example, the depth location at the bottom of the cavity depth direction can correspond to the first sub-channel, the middle region to the second sub-channel, and the region near the opening to the third sub-channel. After completing the position matching, the control system can determine the target cooling adjustment parameters for the corresponding sub-channels based on the cooling compensation requirements at each depth location. For example, when the cooling compensation requirement at a certain depth location is to increase cooling intensity, the cooling medium flow rate or velocity of the corresponding sub-channel can be increased; when the cooling compensation requirement is to reduce cooling intensity, the cooling medium flow rate or cooling medium temperature of the corresponding sub-channel can be appropriately reduced.

[0130] Step S407: Adjust the opening of the regulating valve of each sub-channel according to the target cooling adjustment parameters so that the cooling intensity along the cavity depth direction is distributed in a gradient.

[0131] Gradient distribution refers to a gradual change in cooling intensity along the cavity depth direction, from strong to weak or from weak to strong, rather than a uniform cooling state.

[0132] Specifically, the control system can calculate the required opening value of the corresponding regulating valve based on the target cooling adjustment parameters of each sub-channel, and send control signals to each regulating valve to open the regulating valve to the corresponding target opening.

[0133] Once the regulating valves of each sub-channel have completed their opening adjustments, the cooling medium flow rates of each sub-channel will differ, resulting in a preset gradient distribution of cooling intensity across different regions of the cavity along its depth. For example, in regions with larger material volumes and slower cooling, a larger regulating valve opening can be set to increase the cooling intensity, while in regions with smaller material volumes and faster cooling, the regulating valve opening can be appropriately reduced to decrease the cooling intensity.

[0134] The above adjustments can reduce the shrinkage difference of injection molded parts along the cavity depth direction.

[0135] This application provides a cold airflow-assisted cooling method, referring to... Figure 5 The method includes: Step S501: Before the injection mold performs the mold opening action, cold airflow is introduced into the cavity of the mold core.

[0136] Cold airflow refers to a gaseous medium with a temperature lower than the current surface temperature of the injection molded part and capable of flowing within the cavity space. This gaseous medium can be a low-temperature gas that has undergone cooling treatment. Its main function is to form convective heat transfer on the surface of the injection molded part, thereby removing the heat from the surface of the injection molded part.

[0137] Auxiliary cooling refers to a cooling method that uses gas convection heat exchange to supplement the cooling of the injection molded part in addition to the cooling through the temperature control channel of the mold. This method can quickly cool down local areas on the surface of the injection molded part to accelerate the shrinkage and separation process between the injection molded part and the cavity wall.

[0138] In one feasible embodiment, a cool airflow can be introduced into the cavity of the mold core by providing an airflow pipe on one side of the injection channel of the injection mold.

[0139] Step S502: After a preset cooling time by cold airflow, control the injection mold to perform the mold opening action.

[0140] The preset cold airflow cooling time refers to a pre-set duration after cold airflow is introduced into the mold cavity, designed to ensure a stable cooling effect on the surface of the injection molded part. During this time period, the cold airflow further lowers the surface temperature of the injection molded part and causes additional shrinkage, thereby enhancing the separation tendency between the injection molded part and the cavity wall.

[0141] Step S503: When the mold opening degree reaches the first preset mold opening degree, pause the mold opening action to form a mold opening gap between the fixed mold core and the moving mold core for the cooling air to escape.

[0142] The first preset mold opening degree refers to a certain amount of mold opening displacement that is preset during the mold opening process of the injection mold to achieve controllable release of airflow inside the cavity. When the mold opening displacement of the moving mold core relative to the fixed mold core reaches this preset value, a small but continuous opening channel will be formed inside the cavity. This opening will not allow the mold to open completely, but it can also provide a stable path for the gas inside the cavity to escape.

[0143] The mold opening clearance is the spatial gap formed between the specified mold core and the moving mold core in the partially open mold state. This gap is usually located at the mold parting surface and is used to provide an outlet channel for gas inside the cavity, allowing gas to be discharged from the inside of the cavity to the outside of the mold.

[0144] Step S504: Continuously introduce cold air into the cavity of the mold core, so that the cold air flows through the surface of the injection molded part and then flows out from the mold opening gap.

[0145] In this process, after the fixed mold core is cooled by the temperature control flow channel, the fixed mold core cools the injection molded part, causing the injection molded part to shrink and separate from the inner wall of the cavity of the fixed mold core, forming a separation gap. After the injection mold forms the mold opening gap, a connecting channel is established between the separation gap and the outside of the injection mold. At this time, the cold airflow is no longer stagnant in the cavity, but forms a directional flow path from the air inlet side along the separation gap to the mold opening gap.

[0146] During the flow of the cold airflow in the separation gap, it adheres to the surface of the injection molded part and continuously removes heat from the surface of the injection molded part through convection heat transfer, thereby further reducing the surface temperature of the injection molded part and accelerating the shrinkage rate of the injection molded part.

[0147] Step S505: In response to the injection molded part meeting the preset mold opening conditions, resume the mold opening action.

[0148] Preset mold opening conditions refer to the conditions used to determine whether the injection molded part meets the requirements for continuing the mold opening process. These conditions can be determined based on the airflow distribution. For specific steps, please refer to... Figure 6 The content of the examples.

[0149] Resuming the mold opening action means restarting the mold opening action that was paused in step S503, so that the moving mold core continues to move along the mold opening direction to complete the mold opening action.

[0150] This application provides a method for determining preset mold opening conditions, referring to... Figure 6 The method includes: Step S601: Obtain the airflow distribution thermogram at the mold opening gap.

[0151] An airflow distribution heatmap is a visual data image used to characterize the airflow distribution at the mold opening gap. This heatmap uses different colors to represent airflow velocities in different areas, thus reflecting the flow distribution of cold air at various locations within the mold opening gap. Areas with higher airflow velocities are represented by high-intensity colors on the heatmap, while areas with lower airflow velocities are represented by low-intensity colors. This method can intuitively reflect the uniformity of airflow distribution and localized airflow concentration at the mold opening gap.

[0152] In one embodiment, an infrared imaging device can be used to detect the airflow temperature distribution at the mold opening gap. Because there is a temperature difference between the cold airflow and the air surrounding the mold, the infrared imaging device can identify temperature changes in the area through which the cold airflow passes, thereby obtaining the airflow path. The control system then generates a corresponding airflow distribution heat map based on the temperature changes in the infrared image, thus reflecting the airflow distribution state at the mold opening gap.

[0153] Step S602: Determine the area where the airflow outflow is lower than the preset flow rate threshold based on the airflow distribution heat map, and define the area as the airflow gap area.

[0154] The preset flow threshold is the minimum flow standard used to determine whether the airflow can form an effective outflow at the mold opening gap. This threshold can be preset according to the actual situation.

[0155] The airflow gap area refers to the area in the mold opening gap where airflow is difficult to pass through due to the strong adhesion between the local area of ​​the injection molded part and the fixed mold core, or insufficient local shrinkage.

[0156] After obtaining the airflow distribution heatmap, the airflow parameters corresponding to each region in the heatmap can be analyzed. Specifically, the region corresponding to the mold opening gap can be divided into several discrete grid cells, and the airflow outflow corresponding to each grid cell can be obtained. Subsequently, the airflow outflow of each grid cell is compared with a preset flow rate threshold one by one: when the airflow outflow of a certain grid cell is lower than the preset flow rate threshold, it is determined that there is insufficient airflow in the region corresponding to that grid cell; when the airflow outflow is greater than or equal to the preset flow rate threshold, it is considered that the airflow in that region is normal. After completing the determination of all grid cells, all grid cells with airflow outflow below the preset flow rate threshold can be clustered or connected region merged to obtain several continuously distributed low flow rate regions, and these regions are uniformly defined as airflow gap regions.

[0157] Step S603: Calculate the width ratio of the airflow gap area in the corresponding area of ​​the overall mold opening gap.

[0158] Width ratio refers to the proportional relationship between the projected width of the airflow gap area in the preset direction and the overall width of the corresponding area of ​​the mold opening gap in the same direction. It is used to quantify the distribution degree of insufficient airflow areas in key directions.

[0159] After determining the spatial distribution of the airflow gap region, the projection range of the airflow gap region in a preset direction can be extracted. Specifically, the airflow gap region can be projected in the lateral direction to obtain the continuous distribution interval of the region in the lateral direction. For cases with multiple discrete airflow gap sub-regions, the projected widths of each sub-region in the lateral direction can be merged, i.e., the projection intervals of each sub-region can be unioned to obtain the total coverage width of the overall airflow gap region in the lateral direction. Simultaneously, the overall width of the region in the lateral direction can be determined based on the geometric dimensions of the area corresponding to the mold opening gap, for example, based on the lateral dimension parameters of the mold parting surface or the lateral boundary of the airflow distribution heatmap. After obtaining the total lateral width of the airflow gap region and the lateral width of the overall region, the ratio between the two is calculated to obtain the width proportion.

[0160] Step S604: Compare the width ratio with the preset ratio threshold.

[0161] The preset percentage threshold is a reference standard used to determine whether the airflow gap area is within an acceptable range, and it can be adjusted according to actual needs.

[0162] Step S605: When the width ratio is not greater than the preset ratio threshold, it is determined that the injection molded part meets the preset mold opening conditions.

[0163] When the width ratio is not greater than the preset ratio threshold, it indicates that the coverage of the airflow gap area in the lateral direction is within an acceptable range, and the airflow can form a continuous flow channel in most of the mold opening gap area, indicating that the injection molded part and the fixed mold core have basically formed a stable separation state.

[0164] Based on this, it is determined that the injection molded part has met the preset mold opening conditions, thus allowing the mold opening action to be resumed or continued.

[0165] In some other embodiments, in order to improve the stability of the determination, a continuous determination mechanism can be introduced. That is, the injection molded part is determined to meet the preset mold opening conditions only when the width ratio is not greater than the preset ratio threshold in multiple consecutive sampling times, so as to avoid misjudgment caused by instantaneous airflow fluctuations.

[0166] Step S606: When the width ratio is greater than the preset ratio threshold, it is determined that the injection molded part does not meet the preset mold opening conditions.

[0167] When the width ratio exceeds the preset ratio threshold, it indicates that the airflow gap area still covers a large area in the lateral direction, and the airflow is blocked in multiple areas, failing to form a continuous and stable flow channel in the mold opening gap. In this case, it can be determined that there is still a large area of ​​contact between the injection molded part and the mold core, or insufficient shrinkage in some areas, and a separation gap that meets the demolding requirements has not yet been formed. Therefore, it is determined that the injection molded part does not meet the preset mold opening conditions.

[0168] Based on the above judgment results, the current mold opening pause state can be maintained, and further cooling operations can be carried out to allow the injection molded part to shrink further on the side corresponding to the airflow gap area.

[0169] In some embodiments, the reasons for not meeting the mold opening conditions can be further identified by combining the specific distribution location of the airflow gap area in the lateral direction. For example, it can be determined whether the airflow gap area is concentrated in a certain side area or spans multiple sub-channel corresponding areas, thereby providing a basis for subsequent targeted adjustments.

[0170] This application provides a second method for cold airflow-assisted cooling, referring to... Figure 7 The method includes: Step S701: When the injection molded part does not meet the preset mold opening conditions, determine the distribution side position of the airflow gap area according to the airflow distribution heat map.

[0171] In one feasible embodiment, taking the top view of the injection mold as an example, the mold opening gap can be divided into four side regions, including the upper side region, the lower side region, the left side region, and the right side region. The airflow distribution heat map is mapped to the top view direction, and the distribution side position is determined according to the location of the airflow gap region. For example, if the side region of the mold opening gap corresponding to the airflow gap region is the right side region, then the distribution side region is also the right side region.

[0172] Step S702: Perform region matching between the distribution side position and the sub-channel to determine the target sub-channel corresponding to the distribution side position.

[0173] After determining the distribution side location of the airflow gap area, the distribution side location is matched with the spatial distribution relationship of each sub-flow channel in the injection mold to determine the target sub-flow channel that needs to be adjusted.

[0174] In one feasible embodiment, a mapping relationship between sub-flow channels and the regions on each side of the mold opening gap can be pre-established based on the structural design parameters of the injection mold. For example, a sub-flow channel located on the right side of the mold corresponds to the right side region, a sub-flow channel located on the left side region corresponds to the left side region, and the same correspondence is established for the upper and lower regions. After determining the distribution side position, the sub-flow channel corresponding to the distribution side position is selected from all sub-flow channels according to the pre-established mapping relationship, and is used as the target sub-flow channel. For example, when step S701 determines that the distribution side position of the airflow gap region is the right side region, all sub-flow channels corresponding to the right side region are determined as target sub-flow channels.

[0175] Step S703: Increase the opening of the regulating valve corresponding to the target sub-channel.

[0176] Specifically, by increasing the opening of the regulating valve in the target sub-channel, the flow rate of the cooling medium in the sub-channel can be increased, thereby increasing the temperature drop rate of the fixed mold core corresponding to the target sub-channel, and thus increasing the shrinkage rate of the injection molded part corresponding to the distribution side position.

[0177] Step S704: Reduce the temperature of the cold airflow and control the cold airflow to enter the cavity of the mold core in a pulsed manner.

[0178] By lowering the temperature of the cold air, the material shrinkage rate at the corresponding location in the airflow gap area can be accelerated, promoting the formation of a more obvious separation gap between this area and the fixed mold core.

[0179] Pulsed flow refers to controlling the cold airflow to enter the cavity intermittently and periodically, rather than continuously and stably. In one feasible embodiment, the cold airflow is controlled to flow on and off according to a preset pulse cycle, including a ventilation phase and an intermittent phase; during the ventilation phase, the cold airflow enters the cavity at a target flow rate, and during the intermittent phase, the cold airflow is temporarily stopped.

[0180] By supplying air in a pulsed manner, periodic pressure fluctuations can be formed during the airflow process, causing the airflow to intermittently impact the airflow gap area. This helps to break the local adhesion between the injection molded part and the cavity wall and improve the formation conditions of the airflow channel.

[0181] In some embodiments, the pulse parameters can be adaptively adjusted according to the extent of the airflow gap region. For example, when the width accounts for a large proportion, the pulse period can be shortened and the flow rate during the ventilation phase can be increased to enhance the impact effect; when the width accounts for a small proportion, the pulse period can be appropriately lengthened to achieve a smoother adjustment.

[0182] In addition, the synergistic effect of lowering the temperature of the cold airflow and the pulsed air supply method is that the low-temperature airflow is used to accelerate the material shrinkage, while the pulsed airflow is used to break the local adhesion. The combination of the two can more effectively promote the transformation of the airflow gap area into an effective airflow channel.

[0183] Step S705: Execute the preset mold opening conditions in real time according to the airflow distribution thermal map until the injection molded part meets the preset mold opening conditions.

[0184] Specifically, by continuously acquiring airflow distribution data and repeatedly executing the processing flow in steps S602 to S605, including airflow gap region identification, width ratio calculation, and comparison with a preset ratio threshold, the current detachment state of the injection molded part is dynamically evaluated. In each round of judgment, if the width ratio is still greater than the preset ratio threshold, the judgment result that the injection molded part does not meet the preset mold opening conditions is maintained. Based on the latest airflow distribution, the adjustment operations in steps S701 to S704 are further executed to continuously optimize and adjust the target sub-channel and airflow parameters. When it is detected that the width ratio is not greater than the preset ratio threshold at a certain moment, it is determined that the injection molded part meets the preset mold opening conditions, thereby triggering step S505 and resuming the mold opening action.

[0185] Based on the same inventive concept, embodiments of this application provide a temperature-controlled assisted demolding control system, including: The acquisition module is used to acquire the temperature of the fixed model core; A memory for storing the program of the temperature-controlled assisted demolding control method described above; The processor and the program in the memory can be loaded and executed by the processor to implement the above-mentioned temperature-controlled assisted demolding control method.

[0186] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0187] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as a temperature-controlled assisted demolding control method.

[0188] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0189] Based on the same inventive concept, embodiments of this application provide a smart terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as a temperature-controlled assisted demolding control method.

[0190] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0191] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A temperature-controlled assisted demolding control method, characterized in that, include: In response to the injection completion signal, a cooling medium is introduced into the temperature control channel of the mold core at a first rate to cool the mold core and thus cool the injection molded part. After a preset cooling time, a cooling medium is introduced into the temperature control channel of the mold core at a second rate to cool and shrink the injection molded part, wherein the second rate is greater than the first rate. In response to the mold opening permission command, the injection mold is controlled to perform the mold opening action, so that the injection molded part is separated from the fixed mold core; Control the injection mold to perform the demolding action, ejecting the injection molded part from the moving mold core; During the demolding process, a heating medium is introduced into the temperature control channel of the mold core to reheat the mold core. Once the temperature of the mold core reaches the preset injection temperature, the injection mold is controlled to perform the next injection operation.

2. The temperature-controlled assisted demolding control method according to claim 1, characterized in that, The method includes: Obtain the current temperature data of the fixed model core; The predicted shrinkage of the injection molded part is obtained based on the current temperature data and the material thermal shrinkage parameters of the injection molded part. The predicted separation gap between the injection molded part and the fixed mold core is calculated based on the predicted shrinkage and the cavity size parameters of the fixed mold core. The predicted separation gap is compared with the preset demolding gap threshold to obtain the interface separation determination result; When the interface separation determination result meets the preset demolding gap threshold, a mold opening permission command is generated; After generating the mold opening permission command, a heating medium is introduced into the temperature control channel of the mold core; Continue to supply cooling medium into the temperature-controlled flow channel of the mold core when no mold opening permission instruction is generated.

3. The temperature-controlled assisted demolding control method according to claim 1, characterized in that, The temperature-controlled runner includes a first runner located in the draft zone and a second runner located in the non-draft zone; The method further includes: Obtain the structural information of the injection molded part, and determine the draft area and non-draft area of ​​the injection molded part based on the structural information; Obtain the ratio of the draft area to the non-draft area; Determine if the area ratio is greater than the preset upper limit ratio; If not, the flow rate of the cooling medium into the temperature control channel is obtained based on the area ratio. The first regulating valve of the first flow channel and the second regulating valve of the second flow channel are adjusted according to the flow rate ratio. If so, the first flow channel is adjusted according to the preset flow adjustment method.

4. The temperature-controlled assisted demolding control method according to claim 3, characterized in that, The first flow channel includes several sub-flow channels evenly spaced along the cavity depth direction of the fixed mold core; the adjustment of the first flow channel according to the preset flow adjustment method includes: Extract the thickness distribution data of the injection molded part along the cavity depth direction in the draft zone based on the structural information of the injection molded part; Determine the local volume parameters corresponding to each depth location based on the thickness distribution data; The predicted shrinkage at each depth is calculated based on local volume parameters and the thermal shrinkage parameters of the injection molded part material. The shrinkage difference distribution of the injection molded part along the cavity depth direction is calculated based on the predicted shrinkage at each depth position; The cooling compensation requirements at each depth location are determined based on the shrinkage difference distribution; The cooling compensation requirements at each depth position are matched with the sub-channels corresponding to the depth position to obtain the target cooling adjustment parameters for each sub-channel. Adjust the opening of the regulating valves of each sub-channel according to the target cooling adjustment parameters to make the cooling intensity distributed in a gradient along the cavity depth direction.

5. The temperature-controlled assisted demolding control method according to claim 4, characterized in that, The method further includes: Before the injection mold performs the mold opening action, cold air is introduced into the cavity of the mold core; After a preset cooling time by cold airflow, the injection mold is controlled to perform the mold opening action; When the mold opening degree reaches the first preset mold opening degree, the mold opening action is paused, so that a mold opening gap is formed between the fixed mold core and the moving mold core for the cooling air to escape. Cold air is continuously introduced into the cavity of the mold core, so that the cold air flows through the surface of the injection molded part and then flows out from the mold opening gap; In response to the injection molded part meeting the preset mold opening conditions, the mold opening action is resumed.

6. The temperature-controlled assisted demolding control method according to claim 5, characterized in that, The method further includes: Obtain the thermal map of airflow distribution at the mold opening gap; Based on the airflow distribution heat map, the region where the airflow outflow is lower than the preset flow rate threshold is identified, and this region is defined as the airflow gap region; Calculate the width ratio of the airflow gap area to the corresponding area of ​​the overall mold opening gap; Compare the width ratio with the preset ratio threshold; When the width ratio is not greater than the preset ratio threshold, the injection molded part is determined to meet the preset mold opening conditions; When the width ratio is greater than the preset ratio threshold, the injection molded part is determined not to meet the preset mold opening conditions.

7. The temperature-controlled assisted demolding control method according to claim 6, characterized in that, The method further includes: When the injection molded part does not meet the preset mold opening conditions, the distribution side position of the airflow gap area is determined according to the airflow distribution heat map; The distribution side location is matched with the sub-channel to determine the target sub-channel corresponding to the distribution side location; Increase the opening degree of the regulating valve corresponding to the target sub-flow channel; Lower the temperature of the cold airflow and control the cold airflow to enter the cavity of the mold core in a pulsed manner; The preset mold opening conditions are determined in real time based on the airflow distribution thermal map until the injection molded part meets the preset mold opening conditions.

8. A temperature-controlled assisted demolding control system, characterized in that, The system is used to execute the temperature-controlled assisted demolding control method as described in any one of claims 1 to 7, including: The acquisition module is used to acquire the temperature of the fixed model core; A memory for storing the program of the temperature-controlled assisted demolding control method; The processor and the program in the memory can be loaded and executed by the processor to implement the temperature-controlled assisted demolding control method.

9. A smart terminal, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer program is stored that can be loaded by a processor and execute the method as described in any one of claims 1 to 7.

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