Layered intelligent molding towards resin piston and temperature gradient control method and system

Abstract

The application provides a layered intelligent molding and temperature gradient control method and system for a resin piston, relates to the technical field of intelligent control, and comprises the following steps: dividing molding sub-regions according to the wall thickness of the piston, calculating the solidification and heat release law of each region and establishing a thermal coupling relationship, setting the start time difference and temperature gradient of adjacent regions according to the thermal coupling relationship, and realizing sequential solidification. By monitoring the temperature and conversion rate in real time, dynamically comparing and controlling the boundary, identifying the out-of-limit region and synchronously adjusting the heating power and heat conduction path of the out-of-limit region and adjacent regions, the excessive heat is guided to the adjacent regions, and heat dynamic redistribution is realized. The method can effectively control the temperature gradient in the solidification process and reduce thermal stress and deformation.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology, and in particular to a method and system for layered intelligent molding and temperature gradient control of resin pistons. Background Technology

[0002] In the molding and manufacturing of resin-based composite components, especially for resin piston-like parts with complex three-dimensional structures and non-uniform wall thicknesses, traditional molding processes typically employ either overall synchronous curing or a curing strategy based on simple partitioning. The current conventional approach involves setting a uniform curing temperature profile based on the overall geometry of the part. This profile is usually based on the recommended curing regime of the resin material, and a generally consistent thermal field is applied to the mold or the entire part throughout the molding cycle. A slightly improved approach involves roughly dividing the part into regions based on differences in wall thickness and setting different target isothermal values ​​for different regions to mitigate temperature unevenness caused by differences in heat capacity. The core of these methods lies in controlling the curing process through a preset, static temperature program, relying on the thermal conductivity of the material itself and the homogenizing capacity of the mold to balance the internal temperature field.

[0003] However, the aforementioned conventional methods have significant limitations. Since resin curing is an exothermic process accompanied by a chemical reaction, for complex components with uneven wall thickness distribution, thick-walled areas have strong heat storage capacity and slow heat dissipation. During the exothermic curing stage, heat accumulation is easily generated, leading to excessively high local temperatures, even exceeding the material's permissible range, and causing defects such as resin degradation, increased porosity, or increased residual stress. Conversely, thin-walled areas may experience incomplete curing due to rapid heat loss. Simply setting pre-defined zonal temperature targets is insufficient to address the dynamic, strongly coupled, nonlinear process of exothermic curing; the asynchronous curing between different regions exacerbates internal thermal stress. Furthermore, when a region's temperature exceeds the limit, conventional control methods often only cool that local area. This isolated adjustment may disrupt the thermal balance between regions, obstructing heat transfer paths or triggering new temperature anomalies in other areas. It fails to achieve global optimization and redistribution of heat during the molding process, ultimately affecting the overall molding quality and performance consistency of the component. Summary of the Invention

[0004] The present invention provides a method and system for layered intelligent molding and temperature gradient control of resin pistons, which can solve the problems in the prior art.

[0005] A first aspect of the present invention provides a layered intelligent molding and temperature gradient control method for resin pistons, comprising: The three-dimensional structural parameters of the resin piston and the curing kinetic parameters of the resin material are obtained. The wall thickness distribution characteristics of the resin piston are identified based on the three-dimensional structural parameters, and the resin piston is divided into several molding sub-regions based on the wall thickness distribution characteristics. Based on the curing kinetic parameters, the heat release rate and temperature evolution law of each molding sub-region during the curing process are calculated, the thermal coupling relationship between each molding sub-region and its adjacent molding sub-regions is established, and the dynamic temperature control boundary of each molding sub-region is obtained; Based on the aforementioned thermal coupling relationship, a temperature collaborative control strategy is constructed among the molding sub-regions. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction is initiated sequentially in each molding sub-region, ensuring that the temperature gradient of adjacent molding sub-regions at the curing front remains within the allowable range. During the molding process, the temperature and curing conversion rate of each molding sub-region are monitored in real time. The temperature values ​​are compared with the dynamic temperature control boundary to identify molding sub-regions where the temperature exceeds the limit. Based on the curing conversion rate of the molding sub-region with the temperature exceeding the limit and the temperature status of the adjacent molding sub-regions, the heating power of the molding sub-region with the temperature exceeding the limit and its adjacent molding sub-regions are adjusted synchronously. By reducing the heating power of the molding sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molding sub-regions, the excess heat of the molding sub-region is guided to the adjacent molding sub-regions, thereby realizing the dynamic redistribution of heat.

[0006] Based on the three-dimensional structural parameters, the wall thickness distribution characteristics of the resin piston are identified, and the resin piston is divided into several molding sub-regions based on the wall thickness distribution characteristics, including: Geometric analysis is performed on the three-dimensional structural parameters to extract the cross-sectional profile data of the resin piston in the axial and radial directions. The wall thickness value corresponding to each cross-sectional position is calculated based on the cross-sectional profile data to generate the wall thickness distribution data of the resin piston. Gradient analysis is performed on the wall thickness distribution data to identify the locations where the wall thickness change rate exceeds a preset gradient threshold as wall thickness abrupt change locations, and these wall thickness abrupt change locations are marked as candidate boundary lines for the formed sub-regions. Based on the candidate boundary line and combined with the functional structural features of the resin piston, the resin piston is divided into several molding sub-regions along the axial direction, wherein the wall thickness difference between adjacent molding sub-regions is greater than a preset wall thickness difference value. For each molding sub-region, calculate the average wall thickness value and wall thickness distribution uniformity index of the molding sub-region, and assign a region identifier to each molding sub-region based on the average wall thickness value and wall thickness distribution uniformity index; Establish the spatial topological relationship of each forming sub-region, record the contact area and geometric morphological characteristics of the contact interface between each forming sub-region and its adjacent forming sub-regions, and form a topological relationship diagram of the forming sub-regions.

[0007] Based on the curing kinetic parameters, the heat release rate and temperature evolution of each molding sub-region during the curing process are calculated. The thermal coupling relationship between each molding sub-region and its adjacent molding sub-regions is established, resulting in the dynamic temperature control boundary of each molding sub-region, including: The heat release and duration of the curing reaction in the curing kinetic parameters are obtained, the heat release power of a unit mass of resin material per unit time is calculated, and the heat release rate of each molding sub-region during the curing process is calculated based on the mass of each molding sub-region. For each molding sub-region, the heat release rate of the molding sub-region is added to the external heat obtained by the molding sub-region through the heating device to obtain the total heat input rate of the molding sub-region. Calculate the contact interface area between each molding sub-region and its adjacent molding sub-region, and calculate the heat flow rate transferred from each molding sub-region to its adjacent molding sub-region based on the contact interface area and the thermal conductivity of the resin material. Subtract the heat flow from the molding sub-region to the adjacent molding sub-region from the total heat input rate of each molding sub-region, and then subtract the heat flow from the molding sub-region to the mold to obtain the net heat accumulation rate of the molding sub-region. Based on the net heat accumulation rate and heat capacity of each molding sub-region, the temperature rise rate of the molding sub-region is calculated, and the temperature evolution law of each molding sub-region is obtained based on the temperature rise rate and the time length of the curing process. Based on the heat flow transferred from each molding sub-region to its adjacent molding sub-region, the thermal coupling relationship between each molding sub-region and its adjacent molding sub-region is determined. According to the temperature evolution law of each molding sub-region and the temperature conditions required for the curing reaction, the upper and lower temperature limits of each molding sub-region during the curing process are determined, forming the dynamic temperature control boundary of each molding sub-region.

[0008] Based on the aforementioned thermal coupling relationship, a temperature coordination control strategy is constructed among the molding sub-regions. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction is initiated sequentially by each molding sub-region, ensuring that the temperature gradient of adjacent molding sub-regions at the curing front remains within an allowable range, including: Based on the thermal coupling relationship matrix, the temperature influence propagation time of each molding sub-region on its adjacent molding sub-regions when the curing reaction is initiated is calculated, and the minimum start-up time interval between adjacent molding sub-regions is determined based on the temperature influence propagation time. Based on the wall thickness characteristics and curing kinetic parameters of each molding sub-region, the preheating time required for each molding sub-region to reach the curing start temperature is calculated, and the temperature start time of each molding sub-region is determined in conjunction with the minimum start time interval. A temperature gradient constraint condition is established between adjacent molding sub-regions. The temperature gradient constraint condition stipulates that the ratio of the temperature difference between adjacent molding sub-regions at the curing front position to the distance between the two molding sub-regions must be kept within a preset gradient range. Based on the temperature gradient constraint and the temperature start-up time of each molding sub-region, the maximum allowable temperature difference between adjacent molding sub-regions is calculated, and the maximum temperature difference is used as the temperature gradient amplitude. A temperature control timing table is constructed for each molding sub-region. The temperature control timing table includes the temperature start time, temperature rise rate, and temperature gradient magnitude between each molding sub-region and adjacent molding sub-regions, forming a temperature collaborative control strategy among the molding sub-regions.

[0009] The temperature influence propagation time of each molding sub-region on its adjacent molding sub-regions is calculated based on the thermal coupling relationship matrix, and the minimum start-up time interval between adjacent molding sub-regions is determined based on the temperature influence propagation time, including: The thermal coupling strength coefficient between each molding sub-region and its adjacent molding sub-region is extracted from the thermal coupling relationship matrix. For each molding sub-region, assuming that the molding sub-region suddenly heats up to the curing start temperature at the initial moment, a transient heat conduction model is established to propagate the temperature disturbance of the molding sub-region to its adjacent molding sub-region. By solving the transient heat conduction model, the time required for the temperature change of the molding sub-region to cause the interface temperature of its adjacent molding sub-region to reach the detectable temperature change threshold is calculated, and the time is determined as the temperature influence propagation time of the molding sub-region on its adjacent molding sub-region. For two adjacent molding sub-regions, the propagation time of the temperature influence of one molding sub-region on the other molding sub-region is taken as the reference propagation time; A safety time margin is added to the baseline propagation time to ensure that when the temperature disturbance of the molded sub-region that is started first propagates to the molded sub-region that is started later, it will not cause an unexpected curing reaction in the molded sub-region that is started later, thus forming the minimum start-up time interval between adjacent molded sub-regions.

[0010] Based on the curing conversion rate of the molded sub-region exceeding the temperature limit and the temperature state of adjacent molded sub-regions, the heating power of the molded sub-region exceeding the temperature limit and its adjacent molded sub-regions are simultaneously adjusted. By reducing the heating power of the molded sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molded sub-regions, the excess heat of the molded sub-region is guided to the adjacent molded sub-regions, realizing the dynamic redistribution of heat, including: Obtain the current curing conversion rate and current temperature value of the molded sub-region where the temperature exceeds the limit, and determine whether the molded sub-region has entered the late curing stage based on the current curing conversion rate. The temperature status of adjacent molding sub-regions of the molding sub-region that exceeds the temperature limit is obtained, including the current temperature value and temperature change trend of the adjacent molding sub-regions, and the temperature difference between the molding sub-region that exceeds the temperature limit and the adjacent molding sub-regions is calculated. Based on the curing conversion rate and temperature difference of the molded sub-region where the temperature exceeds the limit, calculate the amount of heating power reduction required for the molded sub-region, and distribute the amount of heating power reduction to each adjacent molded sub-region according to the ratio of the thermal coupling strength coefficient. For each adjacent molding sub-region, the allocated increase in heating power is added to the current heating power of that adjacent molding sub-region to form the adjusted heating power of that adjacent molding sub-region; By adjusting the interfacial contact pressure or the physical properties of the interfacial filling medium between the temperature-exceeding molding sub-region and the adjacent molding sub-region, the thermal conductivity of the heat conduction path between them is increased, promoting the transfer of excess heat from the temperature-exceeding molding sub-region to the adjacent molding sub-region, thereby achieving dynamic heat redistribution.

[0011] A second aspect of the present invention provides a layered intelligent molding and temperature gradient control system for resin pistons, comprising: The parameter acquisition unit is used to acquire the three-dimensional structural parameters of the resin piston and the curing kinetic parameters of the resin material, identify the wall thickness distribution characteristics of the resin piston based on the three-dimensional structural parameters, and divide the resin piston into several molding sub-regions based on the wall thickness distribution characteristics. The thermally coupled edge unit is used to calculate the heat release rate and temperature evolution law of each molding sub-region during the curing process based on the curing kinetic parameters, establish the thermal coupling relationship between each molding sub-region and its adjacent molding sub-region, and obtain the dynamic temperature control boundary of each molding sub-region. The temperature coordination unit is used to construct a temperature coordination control strategy between each molding sub-region based on the thermal coupling relationship. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction of each molding sub-region is started sequentially, and the temperature gradient of adjacent molding sub-regions at the curing front is kept within the allowable range. The dynamic heat unit is used to monitor the temperature and curing conversion rate of each molding sub-region in real time during the molding process. It compares the temperature value with the dynamic temperature control boundary to identify molding sub-regions where the temperature exceeds the limit. Based on the curing conversion rate of the molding sub-region with the temperature exceeding the limit and the temperature status of the adjacent molding sub-regions, it synchronously adjusts the heating power of the molding sub-region with the temperature exceeding the limit and its adjacent molding sub-regions. By reducing the heating power of the molding sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molding sub-regions, the excess heat of the molding sub-region is guided to the adjacent molding sub-regions, realizing the dynamic redistribution of heat.

[0012] A third aspect of the present invention provides an electronic device, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to invoke instructions stored in the memory to execute the aforementioned method.

[0013] A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the aforementioned method.

[0014] This application calculates the exothermic rate and temperature evolution based on curing kinetic parameters, enabling accurate prediction of the curing behavior of each sub-region. It establishes the thermal coupling relationship between sub-regions and determines the dynamic temperature control boundary, providing a scientific theoretical basis and clear control objectives for real-time temperature regulation. This fundamentally solves the problem of unpredictable and uncontrollable heat accumulation and transfer during the curing reaction.

[0015] A temperature coordination control strategy among sub-regions was constructed, achieving sequential triggering and orderly advancement of the curing reaction by setting the start-up time difference and temperature gradient amplitude. This ensured the smooth expansion of the curing front and strictly limited the temperature gradient between adjacent regions within allowable limits. This effectively suppressed internal stress caused by asynchronous curing shrinkage, significantly reducing the risk of defects such as warping and cracking after piston molding.

[0016] During the molding process, temperature and curing conversion rate are monitored in real time and compared with dynamic boundaries, achieving closed-loop feedback control of the curing process. When a temperature exceeding the limit is identified, the method does not adjust the temperature at that point in isolation, but simultaneously adjusts the heating power of the exceeding region and its adjacent regions, and redistributes heat by optimizing the heat conduction path. This dynamic heat guiding mechanism can quickly smooth out local temperature peaks and convert excess heat into effective energy to promote the curing of adjacent regions, thereby eliminating local overheating while improving overall heating efficiency and energy utilization. Ultimately, uniform and stable curing of the resin piston is achieved, ensuring product consistency and reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a layered intelligent molding and temperature gradient control method for resin pistons. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0020] Figure 1 This is a flowchart illustrating a layered intelligent molding and temperature gradient control method for resin pistons, as shown below. Figure 1 As shown, the method includes: The three-dimensional structural parameters of the resin piston and the curing kinetic parameters of the resin material are obtained. The wall thickness distribution characteristics of the resin piston are identified based on the three-dimensional structural parameters, and the resin piston is divided into several molding sub-regions based on the wall thickness distribution characteristics. Based on the curing kinetic parameters, the heat release rate and temperature evolution law of each molding sub-region during the curing process are calculated, the thermal coupling relationship between each molding sub-region and its adjacent molding sub-regions is established, and the dynamic temperature control boundary of each molding sub-region is obtained; Based on the aforementioned thermal coupling relationship, a temperature collaborative control strategy is constructed among the molding sub-regions. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction is initiated sequentially in each molding sub-region, ensuring that the temperature gradient of adjacent molding sub-regions at the curing front remains within the allowable range. During the molding process, the temperature and curing conversion rate of each molding sub-region are monitored in real time. The temperature values ​​are compared with the dynamic temperature control boundary to identify molding sub-regions where the temperature exceeds the limit. Based on the curing conversion rate of the molding sub-region with the temperature exceeding the limit and the temperature status of the adjacent molding sub-regions, the heating power of the molding sub-region with the temperature exceeding the limit and its adjacent molding sub-regions are adjusted synchronously. By reducing the heating power of the molding sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molding sub-regions, the excess heat of the molding sub-region is guided to the adjacent molding sub-regions, thereby realizing the dynamic redistribution of heat.

[0021] In one optional embodiment, the wall thickness distribution characteristics of the resin piston are identified based on the three-dimensional structural parameters, and the resin piston is divided into several molding sub-regions based on the wall thickness distribution characteristics, including: Geometric analysis is performed on the three-dimensional structural parameters to extract the cross-sectional profile data of the resin piston in the axial and radial directions. The wall thickness value corresponding to each cross-sectional position is calculated based on the cross-sectional profile data to generate the wall thickness distribution data of the resin piston. Gradient analysis is performed on the wall thickness distribution data to identify the locations where the wall thickness change rate exceeds a preset gradient threshold as wall thickness abrupt change locations, and these wall thickness abrupt change locations are marked as candidate boundary lines for the formed sub-regions. Based on the candidate boundary line and combined with the functional structural features of the resin piston, the resin piston is divided into several molding sub-regions along the axial direction, wherein the wall thickness difference between adjacent molding sub-regions is greater than a preset wall thickness difference value. For each molding sub-region, calculate the average wall thickness value and wall thickness distribution uniformity index of the molding sub-region, and assign a region identifier to each molding sub-region based on the average wall thickness value and wall thickness distribution uniformity index; Establish the spatial topological relationship of each forming sub-region, record the contact area and geometric morphological characteristics of the contact interface between each forming sub-region and its adjacent forming sub-regions, and form a topological relationship diagram of the forming sub-regions.

[0022] For example, after obtaining the 3D CAD model data of the resin piston, the B-rep representation of the model is first extracted, and the piston surface is discretized into mesh elements. Slicing is performed along the axial direction with a step size of 0.5 mm, generating a 2D cross-sectional profile for each slice plane. The local wall thickness value at that cross-sectional location is obtained by calculating the normal distance between the inner and outer boundaries of the cross-sectional profile. After traversing all slice locations, a 3D wall thickness distribution dataset containing axial coordinates, radial angles, and corresponding wall thickness values ​​is formed.

[0023] Numerical differentiation was performed on the wall thickness distribution data to calculate the wall thickness variation rate between adjacent slice locations. A location with a wall thickness variation rate exceeding 2.0 mm / cm was identified as a sudden change in wall thickness. Considering the impact of measurement noise, a continuity test was performed on the identified sudden change locations: if the wall thickness variation rate at three consecutive sampling points all exceeded the threshold, the location was confirmed as a valid candidate boundary line. Simultaneously, combined with the piston's structural design drawings, the boundary locations of functional structures such as the skirt, pin hole area, and annular groove area were identified. These functional boundaries, along with the sudden change in wall thickness, were comprehensively considered to determine the final boundary line of the formed sub-region.

[0024] After the division is completed, the arithmetic mean of the wall thickness values ​​of all sampling points in each forming sub-region is calculated as the average wall thickness value of that region. According to the order of the average wall thickness values ​​from thinnest to thickest, each forming sub-region is assigned a number, such as "Zone_01" and "Zone_02", and the average wall thickness value and uniformity index of each region are recorded.

[0025] When establishing the spatial topological relationships of the formed sub-regions, the contact interfaces between adjacent regions are identified. For two adjacent regions, a 3D surface patch at their boundary is extracted, and the actual area of ​​this surface patch is calculated as the contact area. By fitting the curvature distribution of the contact interface, the geometric morphological features of the interface are extracted: if the interface curvature changes gently, it is marked as "planar contact"; if the curvature exhibits periodic changes, it is marked as "wavy contact". Each formed sub-region is used as a node, and the adjacent relationships are used as edges to construct a topological relationship graph. Each edge in the graph is accompanied by attribute information such as contact area, interface morphology type, and average curvature value, providing geometric basis data for subsequent establishment of thermal coupling relationships. For adjacent regions with a wall thickness difference greater than 3 mm, the corresponding edges are specially marked in the topological graph as key monitoring locations for temperature gradient control.

[0026] In one optional implementation, the heat release rate and temperature evolution law of each molding sub-region during the curing process are calculated based on the curing kinetic parameters, and the thermal coupling relationship between each molding sub-region and its adjacent molding sub-regions is established to obtain the dynamic temperature control boundary of each molding sub-region, including: The heat release and duration of the curing reaction in the curing kinetic parameters are obtained, the heat release power of a unit mass of resin material per unit time is calculated, and the heat release rate of each molding sub-region during the curing process is calculated based on the mass of each molding sub-region. For each molding sub-region, the heat release rate of the molding sub-region is added to the external heat obtained by the molding sub-region through the heating device to obtain the total heat input rate of the molding sub-region. Calculate the contact interface area between each molding sub-region and its adjacent molding sub-region, and calculate the heat flow rate transferred from each molding sub-region to its adjacent molding sub-region based on the contact interface area and the thermal conductivity of the resin material. Subtract the heat flow from the molding sub-region to the adjacent molding sub-region from the total heat input rate of each molding sub-region, and then subtract the heat flow from the molding sub-region to the mold to obtain the net heat accumulation rate of the molding sub-region. Based on the net heat accumulation rate and heat capacity of each molding sub-region, the temperature rise rate of the molding sub-region is calculated, and the temperature evolution law of each molding sub-region is obtained based on the temperature rise rate and the time length of the curing process. Based on the heat flow transferred from each molding sub-region to its adjacent molding sub-region, the thermal coupling relationship between each molding sub-region and its adjacent molding sub-region is determined. According to the temperature evolution law of each molding sub-region and the temperature conditions required for the curing reaction, the upper and lower temperature limits of each molding sub-region during the curing process are determined, forming the dynamic temperature control boundary of each molding sub-region.

[0027] For example, the heat release ΔH of the curing reaction of the resin material is obtained in joules per kilogram, and the curing reaction duration t_cure is obtained in seconds. The heat release power P_unit per unit mass of resin material per unit time is obtained by dividing the heat release by the curing reaction duration. For the i-th molding sub-region, the mass m_i of the resin material in that sub-region is obtained, and P_unit is multiplied by m_i to obtain the heat release rate Q_react_i of that sub-region during the curing process.

[0028] For the i-th molding sub-region, obtain the heating power P_heat_i provided by the heating device located at the position of the molding sub-region. Add the heat release rate Q_react_i of the molding sub-region to the heating power P_heat_i to obtain the total heat input rate Q_in_i of the molding sub-region.

[0029] By scanning the geometric boundary of the i-th molding sub-region, all adjacent molding sub-regions are identified and labeled as the j-th, k-th, etc., adjacent molding sub-regions. The contact interface area A_ij between the i-th molding sub-region and the j-th adjacent molding sub-region is calculated in square meters. The thermal conductivity λ of the resin material is obtained in watts per meter per Kelvin. Based on the temperature difference ΔT_ij across the contact interface and the characteristic heat transfer distance L_ij between the contact interfaces, the heat flow Q_transfer_ij transferred from the i-th molding sub-region to the j-th adjacent molding sub-region is calculated using Fourier's law of thermal conductivity. All adjacent molding sub-regions of the i-th molding sub-region are traversed, and the total heat flow Q_transfer_i transferred from the i-th molding sub-region to all adjacent molding sub-regions is obtained by summing the results.

[0030] Calculate the contact area A_mold_i between the i-th molding sub-region and the inner surface of the mold, obtain the thermal conductivity of the mold material and the heat dissipation conditions of the outer surface of the mold, and calculate the heat loss Q_loss_i from the molding sub-region to the mold based on the principles of heat transfer. Subtract the total heat input rate Q_in_i of the molding sub-region from the total heat transfer rate Q_transfer_i to the adjacent molding sub-region, and then subtract the heat loss Q_loss_i to the mold to obtain the net heat accumulation rate Q_net_i of the molding sub-region.

[0031] Obtain the mass m_i of the i-th molding sub-region and the specific heat capacity c_p of the resin material, and multiply them to obtain the heat capacity C_i of the molding sub-region. Divide the net heat accumulation rate Q_net_i by the heat capacity C_i to obtain the temperature rise rate dT_i / dt of the molding sub-region. On the time axis of the curing process, starting from the curing start time, discretize the calculation with a time step Δt. In each time step, multiply the temperature rise rate by the time step and accumulate it to the current temperature value to obtain the temperature evolution law T_i(t) of the molding sub-region throughout the curing process.

[0032] By analyzing the heat flow Q_transfer_ij transferred from the i-th molding sub-region to the j-th adjacent molding sub-region, a thermal coupling coefficient K_ij is established to reflect the influence of the temperature change of the i-th molding sub-region on the temperature change of the j-th adjacent molding sub-region. All molding sub-region pairs are traversed to form a thermal coupling matrix describing the thermal coupling relationship between each molding sub-region. Based on the curing reaction characteristics of the resin material, the minimum temperature T_min required to start the curing reaction and the maximum temperature T_max allowed during the curing process to avoid excessive exothermic degradation of the material are determined. For the i-th molding sub-region, combined with its temperature evolution law T_i(t), the upper and lower temperature limits of the molding sub-region are set at each time point in the curing process, forming a dynamic temperature control boundary that changes with time, ensuring that the molding sub-region remains within a safe temperature range throughout the curing process.

[0033] In one optional implementation, a temperature coordination control strategy is constructed between the molding sub-regions based on the thermal coupling relationship. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction is initiated sequentially by each molding sub-region, and the temperature gradient of adjacent molding sub-regions at the curing front is kept within an allowable range, including: Based on the thermal coupling relationship matrix, the temperature influence propagation time of each molding sub-region on its adjacent molding sub-regions when the curing reaction is initiated is calculated, and the minimum start-up time interval between adjacent molding sub-regions is determined based on the temperature influence propagation time. Based on the wall thickness characteristics and curing kinetic parameters of each molding sub-region, the preheating time required for each molding sub-region to reach the curing start temperature is calculated, and the temperature start time of each molding sub-region is determined in conjunction with the minimum start time interval. A temperature gradient constraint condition is established between adjacent molding sub-regions. The temperature gradient constraint condition stipulates that the ratio of the temperature difference between adjacent molding sub-regions at the curing front position to the distance between the two molding sub-regions must be kept within a preset gradient range. Based on the temperature gradient constraint and the temperature start-up time of each molding sub-region, the maximum allowable temperature difference between adjacent molding sub-regions is calculated, and the maximum temperature difference is used as the temperature gradient amplitude. A temperature control timing table is constructed for each molding sub-region. The temperature control timing table includes the temperature start time, temperature rise rate, and temperature gradient magnitude between each molding sub-region and adjacent molding sub-regions, forming a temperature collaborative control strategy among the molding sub-regions.

[0034] For example, based on the obtained thermal coupling matrix, the temperature effect propagation time of each molding sub-region on its adjacent molding sub-regions when the curing reaction is initiated is calculated. This propagation time reflects the time required for heat to transfer from one molding sub-region to an adjacent molding sub-region. The specific calculation needs to consider the distance between the two molding sub-regions, the thermal diffusivity of the resin material, and the thermal conductivity of the mold material. The temperature effect propagation time is obtained by dividing the shortest distance between the two molding sub-regions by the thermal diffusion rate. Based on this propagation time, the minimum start-up time interval between adjacent molding sub-regions is determined. This interval should be greater than the temperature effect propagation time to ensure that heat from the previous molding sub-region is not transferred to the next molding sub-region before the start-up process, thus preventing uncontrolled temperature distribution.

[0035] Based on the wall thickness characteristics and curing kinetic parameters of each molding sub-region, the preheating time required for each sub-region to reach the curing start-up temperature was calculated. For molding sub-regions with thicker walls, the preheating time is correspondingly longer because heat takes longer to transfer to the center; for molding sub-regions with thinner walls, the preheating time is shorter. The preheating time calculation is based on the Fourier heat conduction equation, considering the geometry of the molding sub-region, the initial temperature, and the heating power. The calculated preheating time is combined with the minimum start-up time interval to determine the temperature start-up time of each molding sub-region. The start-up time is set according to the principle of sequential start-up from thick-walled regions to thin-walled regions, or sequential start-up from the bottom to the top of the piston, to ensure that the curing reaction proceeds in an orderly manner throughout the resin piston.

[0036] Establish a temperature gradient constraint between adjacent molding sub-regions. This constraint stipulates that the ratio of the temperature difference between adjacent molding sub-regions at the curing front to the distance between the two molding sub-regions must be maintained within a preset gradient range. The preset gradient range is determined based on the thermal stress tolerance of the resin material and the maximum allowable temperature non-uniformity during curing. If the temperature gradient is too large, it will cause significant thermal stress in the curing front region, leading to microcracks or deformation inside the resin piston; if the temperature gradient is too small, the curing reaction will proceed too slowly, affecting production efficiency. Typically, the preset gradient range is set between 5 and 15 degrees Celsius per millimeter.

[0037] Based on the temperature gradient constraints and the temperature start-up time of each molding sub-region, the maximum allowable temperature difference between adjacent molding sub-regions is calculated. Specifically, the distance between two molding sub-regions is multiplied by the upper limit of the preset gradient range to obtain the maximum temperature difference. This maximum temperature difference serves as the temperature gradient amplitude, guiding subsequent temperature control. In actual control, the heating power of each molding sub-region is adjusted to ensure that the actual temperature difference between adjacent molding sub-regions is always less than this maximum temperature difference, thus ensuring that the temperature gradient during the curing process meets the constraints.

[0038] A temperature control timing table is constructed for each molding sub-region. This timing table records the temperature start-up time, temperature rise rate, and temperature gradient amplitude between each molding sub-region and adjacent molding sub-regions in tabular form. The temperature rise rate is calculated based on the preheating time and target temperature of each molding sub-region, ensuring that each molding sub-region reaches the curing start-up temperature at the predetermined time. The temperature control timing table provides precise control instructions for the actual molding process, forming a temperature collaborative control strategy among the molding sub-regions, and achieving the goal of layered intelligent molding.

[0039] In one optional implementation, the temperature influence propagation time of each molding sub-region on its adjacent molding sub-regions when the curing reaction is initiated is calculated based on the thermal coupling relationship matrix, and the minimum start-up time interval between adjacent molding sub-regions is determined based on the temperature influence propagation time, including: The thermal coupling strength coefficient between each molding sub-region and its adjacent molding sub-region is extracted from the thermal coupling relationship matrix. For each molding sub-region, assuming that the molding sub-region suddenly heats up to the curing start temperature at the initial moment, a transient heat conduction model is established to propagate the temperature disturbance of the molding sub-region to its adjacent molding sub-region. By solving the transient heat conduction model, the time required for the temperature change of the molding sub-region to cause the interface temperature of its adjacent molding sub-region to reach the detectable temperature change threshold is calculated, and the time is determined as the temperature influence propagation time of the molding sub-region on its adjacent molding sub-region. For two adjacent molding sub-regions, the propagation time of the temperature influence of one molding sub-region on the other molding sub-region is taken as the reference propagation time; A safety time margin is added to the baseline propagation time to ensure that when the temperature disturbance of the molded sub-region that is started first propagates to the molded sub-region that is started later, it will not cause an unexpected curing reaction in the molded sub-region that is started later, thus forming the minimum start-up time interval between adjacent molded sub-regions.

[0040] To determine the propagation time of temperature effects and the minimum start-up time interval, the thermal coupling strength coefficient between each molding sub-region and its adjacent molding sub-regions is first extracted from the thermal coupling relationship matrix. The thermal coupling strength coefficient characterizes the heat transfer capacity between two adjacent molding sub-regions; this coefficient is related to the contact area between adjacent molding sub-regions, the thermal conductivity of the material, and the thermal resistance of the contact interface. For each molding sub-region of the resin piston, it is assumed that at the initial time t=0, the molding sub-region suddenly heats up from the ambient temperature T0 to the curing start-up temperature T_cure. At this time, the internal temperature of the molding sub-region exhibits a step change, and this temperature disturbance will propagate to its adjacent molding sub-regions through heat conduction.

[0041] A transient heat conduction model is established to describe the propagation process of temperature disturbances. This model is based on Fourier's law of heat conduction and considers the continuity of heat flow at the interface between the formed sub-regions. For formed sub-region i and its adjacent formed sub-region j, a heat flow continuity equation is established at the interface, where the temperature gradients on both sides of the interface multiplied by their respective thermal conductivityes should be equal. The transient heat conduction model is solved using the finite difference method, discretizing the time domain with a time step of 0.1 to 0.5 seconds. Through iterative calculations, the temperature evolution curves of the adjacent formed sub-region j at the interface over time are obtained.

[0042] The threshold for detectable temperature changes is set to 0.5℃ to 1.0℃. When the change in interface temperature of an adjacent molding sub-region j relative to its initial temperature reaches this threshold, the temperature disturbance in molding sub-region i is considered to have successfully propagated to molding sub-region j. The corresponding time t_prop is recorded, and t_prop is determined as the propagation time of the temperature influence from molding sub-region i to molding sub-region j. For adjacent molding sub-regions with thinner walls and a larger thermal coupling strength coefficient, the temperature influence propagation time is typically 8 to 15 seconds; for adjacent molding sub-regions with thicker walls and a smaller thermal coupling strength coefficient, the temperature influence propagation time can reach 25 to 40 seconds.

[0043] For two adjacent molding sub-regions i and j, due to the directionality of heat conduction, the propagation time of the temperature influence from molding sub-region i to j may differ from that from that from molding sub-region j to i. The larger of these propagation times is taken as the baseline propagation time t_base to ensure that the effects of bidirectional heat conduction are fully considered. A safety margin Δt_safety is added to the baseline propagation time t_base. The setting of the safety margin comprehensively considers factors such as the response delay of the temperature control system, the initiation sensitivity of the curing reaction, and ambient temperature fluctuations. The safety margin is typically taken as 30% to 50% of the baseline propagation time, calculated using the formula Δt_safety = 0.3 × t_base to 0.5 × t_base.

[0044] The minimum start-up time interval T_min is obtained by adding the baseline propagation time to the safety margin, i.e., T_min = t_base + Δt_safety. This minimum start-up time interval ensures that when the temperature disturbance of the molded sub-region that starts first propagates to the molded sub-region that starts later, the latter molded sub-region has not yet reached the curing start-up condition, thereby avoiding unintended curing reactions. In the actual molding process, the actual start-up time difference between adjacent molded sub-regions should not be less than this minimum start-up time interval, with a typical value range of 12 seconds to 60 seconds. The specific value is adjusted according to the wall thickness characteristics and thermal coupling strength of the molded sub-region.

[0045] In one optional implementation, based on the curing conversion rate of the temperature-exceeding molding sub-region and the temperature state of adjacent molding sub-regions, the heating power of the temperature-exceeding molding sub-region and its adjacent molding sub-regions is simultaneously adjusted. By reducing the heating power of the molding sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molding sub-regions, the excess heat of the molding sub-region is guided to the adjacent molding sub-regions, thereby achieving dynamic heat redistribution, including: Obtain the current curing conversion rate and current temperature value of the molded sub-region where the temperature exceeds the limit, and determine whether the molded sub-region has entered the late curing stage based on the current curing conversion rate. The temperature status of adjacent molding sub-regions of the molding sub-region that exceeds the temperature limit is obtained, including the current temperature value and temperature change trend of the adjacent molding sub-regions, and the temperature difference between the molding sub-region that exceeds the temperature limit and the adjacent molding sub-regions is calculated. Based on the curing conversion rate and temperature difference of the molded sub-region where the temperature exceeds the limit, calculate the amount of heating power reduction required for the molded sub-region, and distribute the amount of heating power reduction to each adjacent molded sub-region according to the ratio of the thermal coupling strength coefficient. For each adjacent molding sub-region, the allocated increase in heating power is added to the current heating power of that adjacent molding sub-region to form the adjusted heating power of that adjacent molding sub-region; By adjusting the interfacial contact pressure or the physical properties of the interfacial filling medium between the temperature-exceeding molding sub-region and the adjacent molding sub-region, the thermal conductivity of the heat conduction path between them is increased, promoting the transfer of excess heat from the temperature-exceeding molding sub-region to the adjacent molding sub-region, thereby achieving dynamic heat redistribution.

[0046] After detecting a molding sub-region where the temperature exceeds the limit, the current curing conversion rate α and the current temperature value T_current for that region are first obtained. The curing conversion rate is calculated by the ratio of the total heat release of the resin material pre-measured by differential scanning calorimetry to the cumulative heat release monitored in real time. When the curing conversion rate α ≥ 0.75, the molding sub-region is determined to have entered the late stage of curing. At this time, the crosslinking density of the resin molecular chain segments has reached a high level, and continuing to apply high temperature may lead to thermal degradation of the material or concentration of internal stress.

[0047] The temperature status information of all adjacent molding sub-regions of the temperature-exceeding molding sub-region is obtained. The current temperature value of the adjacent molding sub-regions is collected in real time by a thermocouple array embedded in the mold, and the temperature change trend is characterized by the slope value obtained by linear fitting of the temperature data of the most recent 5 sampling periods. The temperature difference ΔT_j between the temperature-exceeding molding sub-region and the j-th adjacent molding sub-region is calculated as ΔT_j = T_current - T_j, where T_j is the current temperature value of the j-th adjacent molding sub-region. The magnitude of the temperature difference directly determines the driving force intensity of heat transfer.

[0048] Based on the curing conversion rate and temperature differences of the temperature-exceeding molding sub-regions, the required reduction in heating power ΔP_reduce for this region is calculated. Specifically, the current heat release rate dH / dt of the region is first determined. Then, considering the deviation between the target temperature and the current temperature, a proportional-integral control algorithm is used to calculate the power adjustment required to bring the temperature back to the control boundary. This reduction in heating power is allocated to each adjacent molding sub-region according to the thermal coupling strength coefficient. The thermal coupling strength coefficient k_j is calculated based on the contact area, material thermal conductivity, and distance between the adjacent molding sub-regions and the temperature-exceeding region, characterizing the heat exchange capacity between the two regions. The increase in heating power allocated to the j-th adjacent molding sub-region is: ΔP_j = ΔP_reduce × k_j / Σk_j, ensuring the total power distribution is conserved.

[0049] For each adjacent molding sub-region, the calculated increase in heating power ΔP_j is added to the current heating power P_j of that region, resulting in the adjusted heating power P_j_new = P_j + ΔP_j. When adjusting the power, it is necessary to verify whether P_j_new exceeds the rated power limit of the corresponding heating unit in that region. If it does, the excess power is further allocated to other unsaturated adjacent regions. Simultaneously, the temperature change trend of the adjacent molding sub-region is checked. If its temperature is rising at a relatively rapid rate, the power increase allocated to that region is appropriately reduced to avoid triggering new temperature exceedances.

[0050] To facilitate the rapid transfer of excess heat from the temperature-over-limit molding sub-region to adjacent molding sub-regions, heat transfer is enhanced by adjusting the thermal conductivity of the interface between regions. Specific measures include: when the mold employs a segmented structure, increasing the interface contact pressure between the temperature-over-limit molding sub-region and the corresponding modules of adjacent molding sub-regions via a hydraulic system. Increased pressure reduces the interface gap, lowers contact thermal resistance, and improves thermal conductivity by 15% to 30%. When the interface is filled with a thermally conductive medium such as thermal paste or a flexible thermally conductive pad, the equivalent thermal conductivity of the medium is altered by controlling its compression or adjusting the activation state of the microcapsule phase change material within the medium. These adjustments ensure that heat from the temperature-over-limit region is preferentially conducted to adjacent regions via the interface, rather than accumulating within the current region, achieving spatial redistribution of heat and ultimately causing the temperature field of each molding sub-region to tend towards a predetermined gradient distribution pattern.

[0051] A second aspect of the present invention provides a layered intelligent molding and temperature gradient control system for resin pistons, comprising: The parameter acquisition unit is used to acquire the three-dimensional structural parameters of the resin piston and the curing kinetic parameters of the resin material, identify the wall thickness distribution characteristics of the resin piston based on the three-dimensional structural parameters, and divide the resin piston into several molding sub-regions based on the wall thickness distribution characteristics. The thermally coupled edge unit is used to calculate the heat release rate and temperature evolution law of each molding sub-region during the curing process based on the curing kinetic parameters, establish the thermal coupling relationship between each molding sub-region and its adjacent molding sub-region, and obtain the dynamic temperature control boundary of each molding sub-region. The temperature coordination unit is used to construct a temperature coordination control strategy between each molding sub-region based on the thermal coupling relationship. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction of each molding sub-region is started sequentially, and the temperature gradient of adjacent molding sub-regions at the curing front is kept within the allowable range. The dynamic heat unit is used to monitor the temperature and curing conversion rate of each molding sub-region in real time during the molding process. It compares the temperature value with the dynamic temperature control boundary to identify molding sub-regions where the temperature exceeds the limit. Based on the curing conversion rate of the molding sub-region with the temperature exceeding the limit and the temperature status of the adjacent molding sub-regions, it synchronously adjusts the heating power of the molding sub-region with the temperature exceeding the limit and its adjacent molding sub-regions. By reducing the heating power of the molding sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molding sub-regions, the excess heat of the molding sub-region is guided to the adjacent molding sub-regions, realizing the dynamic redistribution of heat.

[0052] A third aspect of the present invention provides an electronic device, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to invoke instructions stored in the memory to execute the aforementioned method.

[0053] A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the aforementioned method.

[0054] This invention can be a method, apparatus, system, and / or computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for performing various aspects of the invention.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A layered intelligent molding and temperature gradient control method for resin pistons, characterized in that, include: The three-dimensional structural parameters of the resin piston and the curing kinetic parameters of the resin material are obtained. The wall thickness distribution characteristics of the resin piston are identified based on the three-dimensional structural parameters, and the resin piston is divided into several molding sub-regions based on the wall thickness distribution characteristics. Based on the curing kinetic parameters, the heat release rate and temperature evolution law of each molding sub-region during the curing process are calculated, the thermal coupling relationship between each molding sub-region and its adjacent molding sub-regions is established, and the dynamic temperature control boundary of each molding sub-region is obtained; Based on the aforementioned thermal coupling relationship, a temperature collaborative control strategy is constructed among the molding sub-regions. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction is initiated sequentially in each molding sub-region, ensuring that the temperature gradient of adjacent molding sub-regions at the curing front remains within the allowable range. During the molding process, the temperature and curing conversion rate of each molding sub-region are monitored in real time. The temperature values ​​are compared with the dynamic temperature control boundary to identify molding sub-regions where the temperature exceeds the limit. Based on the curing conversion rate of the molding sub-region with the temperature exceeding the limit and the temperature status of the adjacent molding sub-regions, the heating power of the molding sub-region with the temperature exceeding the limit and its adjacent molding sub-regions are adjusted synchronously. By reducing the heating power of the molding sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molding sub-regions, the excess heat of the molding sub-region is guided to the adjacent molding sub-regions, thereby realizing the dynamic redistribution of heat.

2. The method according to claim 1, characterized in that, Based on the three-dimensional structural parameters, the wall thickness distribution characteristics of the resin piston are identified, and the resin piston is divided into several molding sub-regions based on these wall thickness distribution characteristics, including: Geometric analysis is performed on the three-dimensional structural parameters to extract the cross-sectional profile data of the resin piston in the axial and radial directions. The wall thickness value corresponding to each cross-sectional position is calculated based on the cross-sectional profile data to generate the wall thickness distribution data of the resin piston. Gradient analysis is performed on the wall thickness distribution data to identify the locations where the wall thickness change rate exceeds a preset gradient threshold as wall thickness abrupt change locations, and these wall thickness abrupt change locations are marked as candidate boundary lines for the formed sub-regions. Based on the candidate boundary line and combined with the functional structural features of the resin piston, the resin piston is divided into several molding sub-regions along the axial direction, wherein the wall thickness difference between adjacent molding sub-regions is greater than a preset wall thickness difference value. For each molding sub-region, calculate the average wall thickness value and wall thickness distribution uniformity index of the molding sub-region, and assign a region identifier to each molding sub-region based on the average wall thickness value and wall thickness distribution uniformity index; Establish the spatial topological relationship of each forming sub-region, record the contact area and geometric morphological characteristics of the contact interface between each forming sub-region and its adjacent forming sub-regions, and form a topological relationship diagram of the forming sub-regions.

3. The method according to claim 1, characterized in that, Based on the curing kinetic parameters, the heat release rate and temperature evolution of each molding sub-region during the curing process are calculated. The thermal coupling relationship between each molding sub-region and its adjacent molding sub-regions is established, resulting in the dynamic temperature control boundary of each molding sub-region, including: The heat release and duration of the curing reaction in the curing kinetic parameters are obtained, the heat release power of a unit mass of resin material per unit time is calculated, and the heat release rate of each molding sub-region during the curing process is calculated based on the mass of each molding sub-region. For each molding sub-region, the heat release rate of the molding sub-region is added to the external heat obtained by the molding sub-region through the heating device to obtain the total heat input rate of the molding sub-region. Calculate the contact interface area between each molding sub-region and its adjacent molding sub-region, and calculate the heat flow rate transferred from each molding sub-region to its adjacent molding sub-region based on the contact interface area and the thermal conductivity of the resin material. Subtract the heat flow from the molding sub-region to the adjacent molding sub-region from the total heat input rate of each molding sub-region, and then subtract the heat flow from the molding sub-region to the mold to obtain the net heat accumulation rate of the molding sub-region. Based on the net heat accumulation rate and heat capacity of each molding sub-region, the temperature rise rate of the molding sub-region is calculated, and the temperature evolution law of each molding sub-region is obtained based on the temperature rise rate and the time length of the curing process. Based on the heat flow transferred from each molding sub-region to its adjacent molding sub-region, the thermal coupling relationship between each molding sub-region and its adjacent molding sub-region is determined. According to the temperature evolution law of each molding sub-region and the temperature conditions required for the curing reaction, the upper and lower temperature limits of each molding sub-region during the curing process are determined, forming the dynamic temperature control boundary of each molding sub-region.

4. The method according to claim 1, characterized in that, Based on the aforementioned thermal coupling relationship, a temperature coordination control strategy is constructed among the molding sub-regions. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction is initiated sequentially by each molding sub-region, ensuring that the temperature gradient of adjacent molding sub-regions at the curing front remains within an allowable range, including: Based on the thermal coupling relationship matrix, the temperature influence propagation time of each molding sub-region on its adjacent molding sub-regions when the curing reaction is initiated is calculated, and the minimum start-up time interval between adjacent molding sub-regions is determined based on the temperature influence propagation time. Based on the wall thickness characteristics and curing kinetic parameters of each molding sub-region, the preheating time required for each molding sub-region to reach the curing start temperature is calculated, and the temperature start time of each molding sub-region is determined in conjunction with the minimum start time interval. A temperature gradient constraint condition is established between adjacent molding sub-regions. The temperature gradient constraint condition stipulates that the ratio of the temperature difference between adjacent molding sub-regions at the curing front position to the distance between the two molding sub-regions must be kept within a preset gradient range. Based on the temperature gradient constraint and the temperature start-up time of each molding sub-region, the maximum allowable temperature difference between adjacent molding sub-regions is calculated, and the maximum temperature difference is used as the temperature gradient amplitude. A temperature control timing table is constructed for each molding sub-region. The temperature control timing table includes the temperature start time, temperature rise rate, and temperature gradient magnitude between each molding sub-region and adjacent molding sub-regions, forming a temperature collaborative control strategy among the molding sub-regions.

5. The method according to claim 4, characterized in that, The temperature influence propagation time of each molding sub-region on its adjacent molding sub-regions is calculated based on the thermal coupling relationship matrix, and the minimum start-up time interval between adjacent molding sub-regions is determined based on the temperature influence propagation time, including: The thermal coupling strength coefficient between each molding sub-region and its adjacent molding sub-region is extracted from the thermal coupling relationship matrix. For each molding sub-region, assuming that the molding sub-region suddenly heats up to the curing start temperature at the initial moment, a transient heat conduction model is established to propagate the temperature disturbance of the molding sub-region to its adjacent molding sub-region. By solving the transient heat conduction model, the time required for the temperature change of the molding sub-region to cause the interface temperature of its adjacent molding sub-region to reach the detectable temperature change threshold is calculated, and the time is determined as the temperature influence propagation time of the molding sub-region on its adjacent molding sub-region. For two adjacent molding sub-regions, the propagation time of the temperature influence of one molding sub-region on the other molding sub-region is taken as the reference propagation time; A safety time margin is added to the baseline propagation time to ensure that when the temperature disturbance of the molded sub-region that is started first propagates to the molded sub-region that is started later, it will not cause an unexpected curing reaction in the molded sub-region that is started later, thus forming the minimum start-up time interval between adjacent molded sub-regions.

6. The method according to claim 1, characterized in that, Based on the curing conversion rate of the molded sub-region exceeding the temperature limit and the temperature state of adjacent molded sub-regions, the heating power of the molded sub-region exceeding the temperature limit and its adjacent molded sub-regions are simultaneously adjusted. By reducing the heating power of the molded sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molded sub-regions, the excess heat of the molded sub-region is guided to the adjacent molded sub-regions, realizing the dynamic redistribution of heat, including: Obtain the current curing conversion rate and current temperature value of the molded sub-region where the temperature exceeds the limit, and determine whether the molded sub-region has entered the late curing stage based on the current curing conversion rate. The temperature status of adjacent molding sub-regions of the molding sub-region that exceeds the temperature limit is obtained, including the current temperature value and temperature change trend of the adjacent molding sub-regions, and the temperature difference between the molding sub-region that exceeds the temperature limit and the adjacent molding sub-regions is calculated. Based on the curing conversion rate and temperature difference of the molded sub-region where the temperature exceeds the limit, calculate the amount of heating power reduction required for the molded sub-region, and distribute the amount of heating power reduction to each adjacent molded sub-region according to the ratio of the thermal coupling strength coefficient. For each adjacent molding sub-region, the allocated increase in heating power is added to the current heating power of that adjacent molding sub-region to form the adjusted heating power of that adjacent molding sub-region; By adjusting the interfacial contact pressure or the physical properties of the interfacial filling medium between the temperature-exceeding molding sub-region and the adjacent molding sub-region, the thermal conductivity of the heat conduction path between them is increased, promoting the transfer of excess heat from the temperature-exceeding molding sub-region to the adjacent molding sub-region, thereby achieving dynamic heat redistribution.

7. A layered intelligent molding and temperature gradient control system for resin pistons, used to implement the method as described in any one of claims 1-6, characterized in that, include: The parameter acquisition unit is used to acquire the three-dimensional structural parameters of the resin piston and the curing kinetic parameters of the resin material, identify the wall thickness distribution characteristics of the resin piston based on the three-dimensional structural parameters, and divide the resin piston into several molding sub-regions based on the wall thickness distribution characteristics. The thermally coupled edge unit is used to calculate the heat release rate and temperature evolution law of each molding sub-region during the curing process based on the curing kinetic parameters, establish the thermal coupling relationship between each molding sub-region and its adjacent molding sub-region, and obtain the dynamic temperature control boundary of each molding sub-region. The temperature coordination unit is used to construct a temperature coordination control strategy between each molding sub-region based on the thermal coupling relationship. By setting the temperature start-up time difference and temperature gradient amplitude of adjacent molding sub-regions, the curing reaction of each molding sub-region is started sequentially, and the temperature gradient of adjacent molding sub-regions at the curing front is kept within the allowable range. The dynamic heat unit is used to monitor the temperature and curing conversion rate of each molding sub-region in real time during the molding process. It compares the temperature value with the dynamic temperature control boundary to identify molding sub-regions where the temperature exceeds the limit. Based on the curing conversion rate of the molding sub-region with the temperature exceeding the limit and the temperature status of the adjacent molding sub-regions, it synchronously adjusts the heating power of the molding sub-region with the temperature exceeding the limit and its adjacent molding sub-regions. By reducing the heating power of the molding sub-region and increasing the thermal conductivity of the heat conduction path of its adjacent molding sub-regions, the excess heat of the molding sub-region is guided to the adjacent molding sub-regions, realizing the dynamic redistribution of heat.

8. An electronic device, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to invoke instructions stored in the memory to execute the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by the processor, they implement the method described in any one of claims 1 to 6.

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