Injection mold temperature field regulation and control method and device based on multi-sensor fusion

Abstract

The invention provides an injection mold temperature field regulation and control method and device based on multi-sensor fusion, and the method comprises the steps: recognizing a non-uniform region based on a surface radiation temperature distribution image, discrete point temperature data, an instantaneous heat flow direction and heat flow intensity information; based on each non-uniformity area and the heating and cooling unit adjacent to the non-uniformity area, constructing a space mapping relation, and based on the space mapping relation, the instantaneous heat flow direction and the heat flow intensity information, generating a heat flow path guide instruction; triggering a corresponding heating and cooling unit to execute alternate heating and cooling operation according to a preset phase difference based on the heat flow path guide instruction, so that the heat flow directionally migrates in the non-uniform region along a specified path; and monitoring that the temperature gradient change trend of each non-uniform area tends to be uniform based on a dynamic heat balance state formed by the heat flow after directional migration in the mold, and entering a steady-state maintenance mode. According to the invention, high-precision sensing and dynamic cooperative regulation and control of the global temperature field of the injection mold are realized.

Description

Technical Field

[0001] This invention relates to the field of computer technology, and in particular to a method and apparatus for controlling the temperature field of injection molds based on multi-sensor fusion. Background Technology

[0002] In injection molding, the uniformity and stability of the mold temperature field directly affect the molding quality, dimensional accuracy, and surface finish of the finished product. Current technologies often employ a closed-loop control method for the mold heating channel based on single-point thermocouple temperature measurement combined with a proportional-integral-derivative (PID) controller. This method involves placing a small number of thermocouple sensors in key areas of the mold to collect local temperature signals in real time, and then feeding these signals back to the PID controller to adjust the heating power, thereby maintaining the set temperature.

[0003] However, relying on only a limited number of single-point temperature sensors cannot comprehensively perceive the overall three-dimensional temperature distribution of the mold, resulting in significant temperature gradient blind spots in complex geometries or high heat flux density areas. This limitation of local perception makes it difficult for the controller to coordinate and regulate the temperature field across the entire mold, easily leading to localized overheating or uneven cooling, which in turn causes defects such as warping, shrinkage marks, or internal stress concentration in the product. Therefore, how to achieve high-precision perception and dynamic coordinated regulation of the temperature field across the entire injection mold has become an urgent technical challenge to be solved. Summary of the Invention

[0004] This invention provides a method and device for temperature field control of injection molds based on multi-sensor fusion, which can realize high-precision sensing and dynamic collaborative control of the temperature field of the entire injection mold.

[0005] In a first aspect, the present invention provides a method for controlling the temperature field of injection molds based on multi-sensor fusion, comprising: Based on surface radiation temperature distribution images, discrete point temperature data, instantaneous heat flow direction, and heat flow intensity information, non-uniform regions with abnormal temperature gradients in the mold temperature field are identified. Based on each non-uniform region and its adjacent heating and cooling units, a spatial mapping relationship is constructed, and based on the spatial mapping relationship, the instantaneous heat flow direction, and the heat flow intensity information, a heat flow path guidance instruction is generated for each non-uniform region; the heat flow path guidance instruction is used to instruct the corresponding heating and cooling unit to perform heating or cooling actions in the next control cycle in a directional timing sequence. Based on the heat flow path guidance command, the corresponding heating and cooling units are triggered to perform alternating heating and cooling operations according to a preset phase difference, so that the heat flow migrates directionally in a non-uniform region along a specified path; Based on the dynamic thermal equilibrium state formed by the heat flow after directional migration inside the mold, when the temperature gradient change trend of each non-uniform region tends to become uniform, it enters the steady-state maintenance mode.

[0006] Secondly, the present invention also provides a temperature field control device for injection molds based on multi-sensor fusion, applied to the temperature field control method for injection molds based on multi-sensor fusion as described in the first aspect; the temperature field control device for injection molds based on multi-sensor fusion includes: The region identification module is used to identify non-uniform regions with abnormal temperature gradients in the mold temperature field based on surface radiation temperature distribution images, discrete point temperature data, instantaneous heat flow direction, and heat flow intensity information. The guidance instruction generation module is used to construct a spatial mapping relationship based on each non-uniform region and its adjacent heating and cooling units, and to generate a heat flow path guidance instruction for each non-uniform region based on the spatial mapping relationship, the instantaneous heat flow direction, and the heat flow intensity information; the heat flow path guidance instruction is used to instruct the corresponding heating and cooling unit to perform heating or cooling actions in the next control cycle in a directional timing sequence. The instruction triggering module is used to trigger the corresponding heating and cooling unit to perform alternating heating and cooling operations according to a preset phase difference based on the heat flow path guidance instruction, so that the heat flow migrates directionally in a non-uniform region along the specified path; The temperature field control module is used to monitor the dynamic thermal equilibrium state formed inside the mold based on the heat flow after directional migration. When the temperature gradient change trend of each non-uniform region tends to become uniform, it enters the steady-state maintenance mode.

[0007] Thirdly, the present invention also provides an electronic device, comprising: a memory for storing computer software programs; and a processor for reading and executing the computer software programs, thereby realizing the injection mold temperature field control method based on multi-sensor fusion as described above.

[0008] Fourthly, the present invention also provides a non-transitory computer-readable storage medium storing a computer software program, which, when executed by a processor, implements the injection mold temperature field control method based on multi-sensor fusion as described above.

[0009] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the above-mentioned method for controlling the temperature field of injection molds based on multi-sensor fusion.

[0010] The multi-sensor fusion-based injection mold temperature field control method provided in this invention accurately identifies non-uniform regions based on surface radiation temperature distribution images, discrete point temperature data, and instantaneous heat flow direction and intensity information, avoiding the sensing blind spots caused by single-point temperature measurement. Based on the spatial mapping relationship between the non-uniform region and the independently controllable heating and cooling units, and combined with instantaneous heat flow direction and intensity information, a directional and temporal heat flow path guidance command is generated, giving the control action physical guidance. The heating and cooling units are synchronously triggered by the heat flow path guidance command to perform alternating operations according to the phase difference, realizing the active directional migration of heat flow in the non-uniform region. Based on the dynamic thermal equilibrium state formed by the directional migration, the changing trend of the non-uniform region is monitored to judge the control effectiveness, ensuring precise termination of intervention. Therefore, this invention effectively eliminates the problem of temperature field control lag and inaccuracy caused by insufficient local sensing, and solves the problem of temperature gradient blind spots and product defects caused by the inability of single-point temperature measurement to fully perceive the temperature distribution across the entire mold, achieving high-precision sensing and dynamic collaborative control of the entire temperature field of the injection mold. Attached Figure Description

[0011] Figure 1 This is a flowchart illustrating the method for controlling the temperature field of injection molds based on multi-sensor fusion provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the injection mold temperature field control device based on multi-sensor fusion provided in an embodiment of the present invention; Figure 3 An embodiment diagram of the electronic device provided in this invention; Figure 4 An embodiment diagram of a computer-readable storage medium provided in accordance with the present invention. Detailed Implementation

[0012] 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.

[0013] Optionally, see Figure 1 , Figure 1 This is a flowchart illustrating the injection mold temperature field control method based on multi-sensor fusion provided by the present invention. In this embodiment, the execution entity of the injection mold temperature field control method based on multi-sensor fusion is a temperature field control device. Therefore, the injection mold temperature field control method based on multi-sensor fusion includes: Step 10: Based on the surface radiation temperature distribution image, discrete point temperature data, instantaneous heat flow direction and heat flow intensity information, identify non-uniform regions with abnormal temperature gradients in the mold temperature field.

[0014] Optionally, infrared thermal imaging sensors, fiber Bragg grating temperature sensors, and heat flux density sensors are respectively installed at multiple asymmetrically distributed embedded mounting positions in the injection mold. The asymmetrically distributed embedded mounting positions refer to sensor mounting holes planned in a non-centrally symmetrical, non-axially symmetrical, or other symmetrical manner according to the cavity structure, gate location, and critical areas prone to temperature accumulation or uneven heat dissipation of the injection mold. Each mounting hole is an embedded pre-reserved structure adapted to the corresponding sensor size.

[0015] Optionally, after the infrared thermal imaging sensor is deployed, it is controlled by the temperature field control device to start and continuously collect images of the surface radiation temperature distribution of the injection mold. The detection range of the sensor covers the outer surface of the mold cavity and the outer surface area of ​​the mold corresponding to the main runner and the branch runner. The acquisition frequency is set to 30 frames per second to achieve real-time capture of the temperature distribution of the mold surface.

[0016] Optionally, after the fiber Bragg grating temperature sensor is deployed, the temperature field control device controls its activation and acquires discrete point temperature data of multiple depth layers inside the mold. The multiple depth layers refer to three to five different depth layers selected sequentially from the surface of the mold inward. At least six discrete detection points are evenly distributed on each layer. The acquisition frequency of discrete point temperature data is set to 10 times per second to ensure that the spatial distribution characteristics of the temperature inside the mold can be fully reflected.

[0017] Optionally, after the heat flux density sensor is deployed, the temperature field control device controls its activation to acquire instantaneous heat flux direction and heat flux intensity information of each area of ​​the mold. Each area refers to several independent detection areas divided into cavity areas, flow channel areas, and mold frame areas. The instantaneous heat flux direction refers to the direction of heat flux transmission inside the mold at a certain moment. The instantaneous heat flux intensity refers to the heat flow rate passing through a unit area per unit time. The acquisition frequency is consistent with that of the infrared thermal imaging sensor, 30 times per second.

[0018] Furthermore, the temperature field control device identifies non-uniform regions with abnormal temperature gradients in the mold temperature field based on the surface radiation temperature distribution image, discrete point temperature data, instantaneous heat flow direction, and heat flow intensity information, as described in steps 101 to 103.

[0019] In one embodiment, a rectangular cavity injection mold has sensors asymmetrically distributed at eight embedded mounting positions, including the four corners of the cavity, the position of the gate corresponding to the mold body, and the outer side of the midpoint of the long side of the cavity. Among them, two infrared thermal imaging sensors are respectively deployed on the front and back of the mold, and the detection range covers the entire surface of the mold; three fiber Bragg grating temperature sensors are respectively embedded in three depth layers of 5mm, 10mm, and 15mm inside the mold, and six discrete detection points are evenly arranged around the cavity in each depth layer; and three heat flux density sensors correspond to the front area of ​​the cavity, the area around the gate, and the rear area of ​​the mold base, respectively.

[0020] The temperature field control device controls the activation of each sensor. The infrared thermal imaging sensor acquires images of the radiation temperature distribution on the mold surface at a frequency of 30 frames per second. The fiber Bragg grating temperature sensor acquires temperature data of 18 discrete points in three depth layers at a frequency of 10 times per second. The heat flux density sensor acquires instantaneous heat flux direction and heat flux intensity information of three corresponding areas at a frequency of 30 times per second.

[0021] Step 20: Based on each non-uniform region and its adjacent heating and cooling units, construct a spatial mapping relationship, and based on the spatial mapping relationship, instantaneous heat flow direction and heat flow intensity information, generate heat flow path guidance instructions for each non-uniform region.

[0022] Optionally, the temperature field control device specifies the spatial location information of each non-uniform region and its adjacent heating and cooling units. The adjacent heating and cooling units refer to the mold-built heating and cooling units located no more than 20mm from the edge of the non-uniform region. The heating unit is a rod heater using electric heating, and the cooling unit is a cooling assembly with built-in cooling channels and temperature control valves.

[0023] Furthermore, the temperature field control device constructs a spatial mapping relationship based on spatial location information. The spatial mapping relationship refers to associating and binding the spatial coordinates of the non-uniform region with the spatial coordinates of adjacent heating and cooling units, clarifying the scope of action and influence weight of each heating and cooling unit on the non-uniform region.

[0024] Furthermore, the temperature field control device generates heat flow path guidance instructions for each non-uniform region based on spatial mapping relationships, instantaneous heat flow direction, and heat flow intensity information, specifically as described in steps 201 to 204. The heat flow path guidance instructions are used to instruct the corresponding heating or cooling unit to perform heating or cooling actions in the next control cycle in a directional timing sequence. The control cycle refers to the complete time period for the temperature field control device to complete one data acquisition, instruction generation, and execution feedback, set to 0.5 seconds. The directional timing sequence refers to the specific time node and duration at which the heating or cooling unit initiates heating or cooling actions within the control cycle, as well as the order in which the actions are executed.

[0025] In one embodiment, for example, a non-uniform region around the gate is identified, with spatial coordinates ranging from 50-80mm on the X-axis, 30-60mm on the Y-axis, and 0-15mm on the Z-axis. The adjacent heating and cooling units consist of two rod heaters (located at 45mm and 45mm on the X-axis and 85mm and 45mm on the Y-axis, respectively) and one cooling unit (located at 65mm on the X-axis and 20mm on the Y-axis). The temperature field control device constructs a spatial mapping relationship between the non-uniform region and the three heating and cooling units, specifying that the left heater has a weight of 0.6 for the non-uniform region within the 50-65mm X-axis range, the right heater has a weight of 0.6 for the non-uniform region within the 65-80mm X-axis range, and the cooling unit has a weight of 0.4 for the entire non-uniform region.

[0026] Step 30: Based on the heat flow path guidance command, the corresponding heating and cooling unit is triggered to perform alternating heating and cooling operations according to the preset phase difference, so that the heat flow migrates directionally in the non-uniform region along the specified path.

[0027] Optionally, the temperature field control device transmits the heat flow path guidance command to the drive control module of the corresponding heating and cooling unit. After receiving the command, the drive control module triggers the corresponding heating and cooling unit to perform alternating heating and cooling operations according to the preset phase difference.

[0028] Optionally, the preset phase difference refers to the time difference between the start of heating or cooling actions between multiple heating and cooling units. This phase difference is determined according to the directional timing in the heat flow path guidance command to ensure that the actions of each unit can cooperate to form a heat flow driving force in a specified direction.

[0029] Optionally, during the alternating heating and cooling operation, the temperature field control device continuously collects surface radiation temperature distribution images, internal discrete point temperature data, and instantaneous heat flow direction and intensity information of the non-uniform region through various sensors deployed in step 10, and monitors the heat flow transfer status in real time to ensure that the heat flow can migrate directionally in the non-uniform region along the path specified by the heat flow path guidance command.

[0030] Directional migration refers to the movement of heat flow from areas with higher temperatures to areas with lower temperatures along a planned path, in order to avoid heat flow disturbances or accumulation.

[0031] In one embodiment, for example, the heat flow path guidance instruction generated in step 20 is: in the next 0.5-second control cycle, start heating of the left heater in 0-0.2 seconds, start heating of the right heater in 0.1-0.3 seconds, start cooling of the cooling unit in 0.2-0.5 seconds, and guide the heat flow to diffuse uniformly along the X-axis in the non-uniform region.

[0032] The heat flow path guidance command is transmitted to the drive control module corresponding to the two rod heaters and one cooling unit, triggering each unit to perform operations according to a preset phase difference: at 0 seconds, the temperature field control device triggers the left heater to start heating, with the heating power set to 500 watts; at 0.1 seconds, it triggers the right heater to start heating, with the heating power set to 500 watts, forming a 0.1-second phase difference with the left heater; at 0.2 seconds, it triggers the cooling unit to start cooling, using 25°C cooling water at a flow rate set to 3 liters per minute, forming a 0.2-second phase difference with the left heater and a 0.1-second phase difference with the right heater. Within a 0.5-second control cycle, the temperature field control device uses an infrared thermal imaging sensor to collect real-time images of the surface temperature distribution in the non-uniform area around the gate, a fiber Bragg grating temperature sensor to collect temperature data at discrete points inside, and a heat flux density sensor to collect the instantaneous heat flow direction and intensity. Monitoring data shows that the heat flow diffuses from the center of the gate to both sides along the X-axis. The temperature at the 55mm position on the X-axis in the non-uniform region drops from the initial 85℃ to 78℃, while the temperature at the 75mm position on the X-axis rises from the initial 60℃ to 72℃. The heat flow achieves directional migration along the specified path.

[0033] Step 40: When the temperature gradient change trend of each non-uniform region tends to become uniform, based on the dynamic thermal equilibrium state formed by the heat flow after directional migration inside the mold, the system enters the steady-state maintenance mode.

[0034] Optionally, the temperature field control device continuously monitors the dynamic thermal equilibrium state formed inside the mold by the heat flow after directional migration. The dynamic thermal equilibrium state refers to the state in which the heat flow input and output inside the mold tend to be balanced, and the temperature fluctuation of each area over time is within a preset range.

[0035] Optionally, during the monitoring process, the temperature field control device focuses on analyzing the temperature gradient change trend of each non-uniform region. The temperature gradient change trend refers to the trend of the temperature difference between different locations and different depths in the non-uniform region over time within multiple consecutive control cycles.

[0036] Optionally, the temperature field control device has a preset temperature gradient homogenization criterion: the temperature difference between any two detection points in the non-uniform region does not exceed 5°C, and this state is maintained for at least 3 consecutive control cycles. When the temperature field control device detects that the temperature gradient change trend in each non-uniform region meets the above homogenization criterion, i.e., it tends to be homogenized, the entire temperature field control system is controlled to switch from heat flow directional control mode to steady-state maintenance mode.

[0037] Optionally, in steady-state maintenance mode, the temperature field control device adjusts the control strategy to reduce the action amplitude and frequency of the heating and cooling units. Reducing the action amplitude refers to reducing the heating power of the heating unit and the cooling medium flow rate of the cooling unit. Reducing the frequency refers to extending the control cycle to 2 seconds to maintain the stable state of the mold temperature field and avoid new abnormal temperature gradients caused by excessive control.

[0038] Optionally, the temperature field control device continues to monitor at low frequency using various sensors. Once the temperature gradient is detected to exceed the homogenization range, it immediately exits the steady-state maintenance mode and re-executes the control process from steps 10 to 30.

[0039] In one embodiment, during the heat flow directional migration process in step 30, the temperature field control device continuously monitors the temperature gradient change trend of the non-uniform region around the gate. The preset homogenization criterion is: the temperature difference between any detection points in the region is ≤5℃, and this continues for three 0.5-second control cycles (i.e., 1.5 seconds). During continuous monitoring, in the fourth control cycle, the temperature of each detection point on the surface of the non-uniform region is between 73-76℃, and the temperature of each detection point within a 15mm depth is between 72-75℃, with a maximum temperature difference of 4℃ between any two points. In the fifth and sixth control cycles, this temperature distribution state is maintained, satisfying the homogenization criterion.

[0040] Optionally, the temperature field control device determines that the temperature gradient change trend in the non-uniform region is becoming more uniform, and then the control system enters a steady-state maintenance mode: reducing the heating power of the two rod heaters from 500 watts to 200 watts, reducing the cooling water flow rate of the cooling unit from 3 liters per minute to 1 liter per minute, and extending the control cycle from 0.5 seconds to 2 seconds. Simultaneously, the temperature field control device controls the sensor to monitor at a frequency of once every 2 seconds, continuously maintaining the stable state of the mold temperature field. In subsequent monitoring, if the temperature difference between two points in the region is detected to rise to 6°C at a certain moment, the temperature field control device immediately exits the steady-state maintenance mode and restarts the heat flow directional control process.

[0041] The embodiments of the present invention effectively eliminate the problem of temperature field control lag and inaccuracy caused by insufficient local sensing, and solve the problem of temperature gradient blind zone and product defects caused by the inability of single-point temperature measurement to fully perceive the temperature distribution of the entire mold. It realizes high-precision sensing and dynamic collaborative control of the temperature field of the entire injection mold.

[0042] Optionally, the processes of steps 101 to 103 include: Step 101: Based on the temperature value difference features of adjacent pixels in the surface radiation temperature distribution image arranged continuously in space, the spatial continuity of local temperature change is obtained, and based on the spatial continuity, the closed region enclosed by the temperature value abrupt change boundary is identified in the surface radiation temperature distribution image.

[0043] Optionally, the temperature field control device extracts the spatially consecutive temperature difference features between adjacent pixels in the surface radiation temperature distribution image. Adjacent pixels refer to pixels that are directly adjacent in spatial position within the two-dimensional pixel matrix of the surface radiation temperature distribution image, including pixels adjacent in the horizontal and vertical directions. Temperature difference features refer to the magnitude and variation pattern of the temperature difference between two adjacent pixels; spatially consecutive arrangement means that adjacent pixels are sequentially connected according to the two-dimensional spatial coordinates of the image, forming a continuous pixel sequence.

[0044] Optionally, the specific extraction process in this embodiment of the invention is as follows: the temperature field control device traverses all pixels of the surface radiation temperature distribution image in the order from left to right and from top to bottom, calculates the temperature value difference between each pixel and the adjacent pixel on the right and the adjacent pixel below, records the magnitude of each difference and the spatial coordinates of the corresponding two pixels, and forms a continuous temperature value difference sequence.

[0045] Furthermore, based on the extracted temperature value difference features, the temperature field control device obtains the spatial continuity of local temperature changes. Here, the spatial continuity of local temperature changes refers to the fact that within a local region of the surface radiation temperature distribution image, the temperature value difference between adjacent pixels remains within a preset small range, resulting in a continuous and smooth temperature change in that local region.

[0046] Optionally, the specific judgment process of the embodiment is as follows: the temperature field control device sets a continuous temperature difference threshold, which is a preset value based on the thermal conductivity of the mold material and the injection molding process requirements, and the value range is 1 to 3℃; for the temperature value difference sequence obtained by traversal, when the temperature value difference of multiple consecutive adjacent pixels is less than or equal to the continuous temperature difference threshold, it is determined that the area where these adjacent pixels are located is a region with continuous temperature change space.

[0047] Furthermore, based on the spatial continuity of the local temperature changes obtained above, the temperature field control device identifies the closed region enclosed by the temperature value abrupt change boundary in the surface radiation temperature distribution image. Here, the temperature value abrupt change boundary refers to the line connecting adjacent pixels where the temperature value difference suddenly exceeds a preset abrupt change threshold. This threshold is a preset value based on the normal operating temperature range of the mold and the allowable temperature gradient range, with a value ranging from 5 to 8°C. The closed region refers to the image area with a closed contour formed by the temperature value abrupt change boundary as its boundary line.

[0048] Optionally, the specific identification process in this embodiment of the invention is as follows: when traversing the temperature value difference sequence, if the temperature value difference of a certain adjacent pixel point pair is detected to be greater than a preset mutation threshold, the pixel point pair is marked as a mutation point pair; continue to traverse the surrounding pixels to find all mutation point pairs connected to the mutation point pair, forming a continuous mutation point pair sequence; when the mutation point pair sequence forms a closed contour line, the temperature field control device determines that the area enclosed by the closed contour line is a closed area enclosed by the temperature value mutation boundary, and records the two-dimensional coordinate range of the closed area in the surface radiation temperature distribution image.

[0049] Step 102: Based on the three-dimensional coordinate position of each temperature measuring point in the mold entity structure and its corresponding measured temperature value in the discrete temperature data, obtain the local temperature gradient vector between each temperature measuring point and its nearest neighbor temperature measuring point. Based on the direction consistency and amplitude change characteristics of the local temperature gradient vector, identify the cluster of temperature measuring points in the mold internal space where the direction deflection of the temperature gradient is greater than the preset deflection threshold.

[0050] Optionally, the temperature field control device organizes the acquired discrete temperature data to determine the three-dimensional coordinate position of each temperature measuring point in the mold's physical structure and its corresponding measured temperature value. The three-dimensional coordinate position refers to the X-axis, Y-axis, and Z-axis coordinates of each temperature measuring point in a three-dimensional Cartesian coordinate system established with a fixed reference point of the mold as the origin. The X-axis and Y-axis correspond to the horizontal plane direction of the mold, and the Z-axis corresponds to the depth direction of the mold (i.e., the direction from the mold surface inwards).

[0051] The measured temperature value refers to the actual temperature value obtained by the fiber Bragg grating temperature sensor from the temperature detection of each measuring point. The data processing process is as follows: the temperature field control device associates and stores the three-dimensional coordinate position of each measuring point with the corresponding measured temperature value, forming a three-dimensional coordinate-temperature data table for the measuring point.

[0052] Optionally, based on the compiled three-dimensional coordinate-temperature data table of the temperature measurement points, the temperature field control device obtains the local temperature gradient vector between each temperature measurement point and its nearest neighbor temperature measurement point. The nearest neighbor temperature measurement point refers to the temperature measurement point with the smallest three-dimensional spatial distance from the target temperature measurement point among all temperature measurement points. The three-dimensional spatial distance refers to the value obtained according to the formula for calculating the three-dimensional spatial distance between two points, calculated as the square root of the sum of the squares of the differences in the X-axis, Y-axis, and Z-axis coordinates of the two temperature measurement points. The local temperature gradient vector is a vector characterizing the direction and rate of temperature change between the target temperature measurement point and its nearest neighbor temperature measurement point. The direction of this vector is from the temperature measurement point with lower temperature to the temperature measurement point with higher temperature, and the magnitude of the vector is the ratio of the temperature difference between the two temperature measurement points to the three-dimensional spatial distance.

[0053] Optionally, the specific calculation process of this embodiment of the invention is as follows: For each target temperature measuring point, the temperature field control device traverses all other temperature measuring points in the three-dimensional coordinate-temperature data table, calculates the three-dimensional spatial distance between the target temperature measuring point and each other temperature measuring point, and selects the temperature measuring point with the smallest three-dimensional spatial distance as the nearest neighbor temperature measuring point; calculates the temperature value difference between the target temperature measuring point and the nearest neighbor temperature measuring point to determine the direction of temperature change; calculates the ratio of the temperature value difference to the three-dimensional spatial distance to obtain the amplitude of the local temperature gradient vector; and combines the temperature change direction and amplitude to form the local temperature gradient vector of the target temperature measuring point.

[0054] Furthermore, based on the local temperature gradient vectors at each temperature measuring point, the temperature field control device analyzes the directional consistency and amplitude abrupt change characteristics of the local temperature gradient vectors. Directional consistency refers to the fact that the angle between the directions of the local temperature gradient vectors at multiple adjacent temperature measuring points is within a preset angle range, indicating that the heat transfer direction in the area where these temperature measuring points are located is relatively consistent. The angle between two local temperature gradient vectors is calculated using the direction cosine of the two vectors: specifically, the ratio of the sum of the products of the X-axis, Y-axis, and Z-axis components of the two vectors to the product of the amplitudes of the two vectors, and then taking the inverse cosine of this ratio; the preset angle range is 0 to 30 degrees. Amplitude abrupt change characteristics refer to the fact that the amplitude difference of the local temperature gradient vectors at adjacent temperature measuring points is greater than a preset amplitude abrupt change threshold, indicating that the rate of temperature change in the area where these temperature measuring points are located has suddenly changed significantly; the preset amplitude abrupt change threshold is a value preset based on the thermal conductivity of the mold material and the normal temperature gradient range, with a value range of 2 to 4℃ / mm.

[0055] Optionally, the specific analysis process in this embodiment of the invention is as follows: The temperature field control device divides the internal space of the mold into several local analysis regions according to three-dimensional coordinates, and the size of each local analysis region is 10mm*10mm*10mm; for all temperature measuring points in each local analysis region, the angle between the directions of the local temperature gradient vectors of any two adjacent temperature measuring points is calculated, the number of temperature measuring points whose angles are within the preset angle range is counted, and the consistency of the directions of the temperature measuring points in the region is determined; at the same time, the amplitude difference of the local temperature gradient vectors of any two adjacent temperature measuring points is calculated, and it is determined whether there is a case where the amplitude difference is greater than the preset amplitude change threshold, and the amplitude change characteristics are identified.

[0056] Furthermore, based on the consistency of direction and abrupt change in amplitude of the local temperature gradient vector, the temperature field control device identifies temperature measurement point clusters within the mold's internal space where the direction deflection of the temperature gradient exceeds a preset deflection threshold. Here, the direction deflection of the temperature gradient refers to the angle between the local temperature gradient vector of a given temperature measurement point and the local temperature gradient vectors of its neighboring temperature measurement points. When this angle exceeds the preset deflection threshold, it indicates a significant change in the temperature transmission direction at the location of that temperature measurement point. The preset deflection threshold is a value predetermined based on the range of normal heat flow direction changes within the mold, ranging from 30 to 60 degrees. A temperature measurement point cluster refers to a set of multiple adjacent temperature measurement points with a temperature gradient direction deflection exceeding the preset deflection threshold. These temperature measurement points are adjacent to each other in three-dimensional space, forming a continuous cluster region.

[0057] Optionally, the specific identification process in this embodiment of the invention is as follows: the temperature field control device traverses the temperature measurement points in each local analysis area, and for each temperature measurement point, calculates the direction angle between its local temperature gradient vector and all adjacent temperature measurement points; when the direction angle between a certain temperature measurement point and at least three adjacent temperature measurement points is greater than a preset deflection threshold, the temperature measurement point is marked as a temperature measurement point with abnormal direction deflection; the device continues to search for other temperature measurement points with abnormal direction deflection that are adjacent to the temperature measurement point with abnormal direction deflection in three-dimensional space, and when the number of these temperature measurement points with abnormal direction deflection reaches a preset number threshold (the preset number threshold is 5 to 8), the set of these temperature measurement points is determined to be a temperature measurement point cluster with a temperature gradient direction deflection greater than the preset deflection threshold, and the three-dimensional coordinate range of the temperature measurement point cluster in the internal space of the mold is recorded.

[0058] Step 103: Based on the instantaneous heat flow direction, heat flow intensity information, enclosed region, and temperature measurement point cluster, non-uniform regions are identified.

[0059] Optionally, the temperature field control device identifies non-uniform regions based on instantaneous heat flow direction, heat flow intensity information, enclosed area, and temperature measurement point cluster, as in steps 1031 to 1034.

[0060] The embodiments of the present invention ensure the accuracy and comprehensiveness of the identification results through progressive identification from the surface to the interior and fusion analysis of multiple feature parameters. It can accurately locate non-uniform regions with abnormal temperature gradients in the mold temperature field, ensure the effectiveness and pertinence of subsequent heat flow control, and improve the uniformity of the mold temperature field. Thus, it realizes high-precision perception and dynamic collaborative control of the entire temperature field of the injection mold.

[0061] Optionally, the process of steps 1031 to 1034 includes: Step 1031: Based on the physical orientation information of the instantaneous heat flow direction at various locations on and inside the mold surface, the actual trajectory of the heat flow line in space is obtained, and based on the actual trajectory and the spatial overlap relationship of the closed area, the set of intersection segments where the heat flow line crosses the boundary of the closed area is selected.

[0062] Optionally, the temperature field control device retrieves instantaneous heat flow direction data and extracts the physical orientation information at various locations on and inside the mold surface. The physical orientation information refers to the specific orientation of the instantaneous heat flow direction in the mold's three-dimensional spatial coordinate system, characterized by the angle between the orientation and the coordinate axes of the mold's three-dimensional coordinate system. The mold's three-dimensional spatial coordinate system is a three-dimensional rectangular coordinate system established with the geometric center of the mold cavity as the origin, the horizontal direction parallel to the mold parting surface as the X-axis, the horizontal direction perpendicular to the mold parting surface as the Y-axis, and the mold depth direction perpendicular to the parting surface as the Z-axis.

[0063] Furthermore, based on physical orientation information, the temperature field control device obtains the actual trajectory of the heat flow lines in space. Here, the heat flow line refers to the virtual line representing the path of heat flow inside the mold, and the tangent direction at any point on the line is consistent with the instantaneous heat flow direction at that point; the actual trajectory refers to the continuous path shape of the heat flow lines in the three-dimensional space of the mold.

[0064] The specific acquisition process of this invention embodiment is as follows: The temperature field control device selects several heat flow direction sampling points on the surface and inside of the mold according to a preset spatial sampling interval. The sampling interval ranges from 2 to 5 mm to ensure that the sampling points can fully cover the cavity area, flow channel area and mold frame area of ​​the mold. The instantaneous heat flow physical direction information of each sampling point is continuously fitted, and the heat flow direction information between adjacent sampling points is supplemented by a linear interpolation method. The linear interpolation method is as follows: Based on the heat flow direction of two adjacent sampling points, the heat flow direction at any position between the two points is calculated so that the heat flow direction of adjacent sampling points can be smoothly transitioned. The heat flow direction information of all sampling points is connected in spatial order to form a continuous heat flow line, thereby obtaining the actual trajectory of the heat flow line in space.

[0065] Furthermore, the temperature field control device retrieves the closed region and determines its spatial coordinate range. The spatial coordinate range of the closed region refers to the X, Y, and Z axis coordinate intervals of this region in the mold's three-dimensional spatial coordinate system. The Z-axis coordinate is a fixed depth value corresponding to the mold surface (taken as 0 mm, i.e., the plane containing the mold's outer surface). Based on the actual trajectory of the heat flow lines and the spatial coordinate range of the closed region, the temperature field control device analyzes their spatial overlap. This spatial overlap refers to whether there is any overlap between the actual trajectory of the heat flow lines and the spatial coordinate range of the closed region, i.e., whether the heat flow lines cross the boundary of the closed region and enter its interior.

[0066] Furthermore, based on the aforementioned spatial overlap relationship, the temperature field control device filters out the set of intersection segments where heat flow lines cross the boundary of the closed region. Here, the boundary of the closed region refers to the outline edge of the closed region, composed of the spatial coordinate points corresponding to the temperature abrupt change boundary in step 101; an intersection segment refers to the line segment of the heat flow line that crosses the boundary of the closed region, with one end located outside the closed region and the other end inside; the set of intersection segments refers to the collection of all intersection segments that satisfy the above conditions. The specific filtering process is as follows: the temperature field control device traverses the actual trajectory of each heat flow line and determines whether the trajectory intersects with the boundary of the closed region; when a heat flow line has two intersection points with the boundary of the closed region (the entry point into the closed region and the exit point out of the closed region), the heat flow line segment between the two intersection points is extracted, and this segment is the intersection segment where the heat flow line crosses the boundary of the closed region; all identified intersection segments are summarized to form the set of intersection segments.

[0067] Step 1032: Based on the measured values ​​of the heat flux rate per unit area at each location in the heat flux intensity information, obtain the heat flux intensity distribution density map in the mold space, and based on the degree of spatial overlap between the distribution density map and the temperature measurement point cluster, determine the target area where the heat flux intensity is at its extreme value in the temperature measurement point cluster area.

[0068] Optionally, the temperature field control device retrieves heat flux intensity information and extracts the measured values ​​of heat flux rate per unit area at various locations. The heat flux rate per unit area refers to the amount of heat passing through a unit area of ​​the mold per unit time; its measured value is directly acquired by the heat flux density sensor and is expressed in W / m². "Various locations" refers to the locations where the heat flux density sensor is installed and other locations on the mold divided according to a preset interpolation interval. The preset interpolation interval is consistent with the spatial sampling interval in step 1031, and is 2 to 5 mm.

[0069] Furthermore, based on the measured values ​​of the heat flux rate per unit area, the temperature field control device obtains a distribution density map of the heat flux intensity in the mold space. The distribution density map is a visual map that uses the three-dimensional spatial coordinates of the mold as the horizontal, vertical, and axial axes, and the heat flux rate per unit area as the color gradient characterization parameter, intuitively presenting the distribution of heat flux intensity at different spatial locations within the mold. The color gradient characterization parameter divides the range of heat flux rate per unit area into several gradient intervals, each interval corresponding to a specific color, reflecting the difference in heat flux intensity through variations in color depth or hue.

[0070] Optionally, the specific generation process of this embodiment of the invention is as follows: the extracted measured values ​​of heat flux rate per unit area are validated, and abnormal values ​​that exceed the sensor measurement range are removed. The sensor measurement range is preset to 0w / ㎡ to 1000w / ㎡. The validated measured values ​​are supplemented using a three-dimensional interpolation method. Specifically, the three-dimensional interpolation method is as follows: based on the measured values ​​in three adjacent dimensions, the estimated value of heat flux rate per unit area at locations where sensors are not deployed in the mold space is calculated to ensure that the heat flux intensity data can cover the entire mold space. The validated measured values ​​and the interpolated estimated values ​​are mapped according to the corresponding three-dimensional spatial coordinates to divide the heat flux intensity gradient intervals (the number of gradient intervals is set to 8 to 12), and a corresponding color is assigned to each gradient interval to generate a distribution density map of heat flux intensity in the mold space.

[0071] Furthermore, the temperature field control device retrieves the temperature measurement point cluster and determines its spatial coordinate range. The spatial coordinate range of the temperature measurement point cluster refers to the X, Y, and Z axis coordinate intervals covered by the three-dimensional coordinates of all temperature measurement points within the cluster. Based on the distribution density map and the spatial coordinate range of the temperature measurement point cluster, the temperature field control device analyzes the degree of spatial overlap between the two. Specifically, the degree of spatial overlap refers to the proportion of the area overlapping the spatial coordinate range of the temperature measurement point cluster in the distribution density map to the total area of ​​the temperature measurement point cluster's spatial coordinate range. This proportion is obtained by calculating the ratio of the spatial volume of the overlapping portion to the spatial volume of the temperature measurement point cluster. The spatial volume is calculated as the product of the length, width, and height of the corresponding coordinate interval.

[0072] Furthermore, based on the aforementioned spatial overlap, the temperature field control device determines the target area where the heat flux intensity is at its extreme value within the temperature measurement point cluster region. Here, an extreme heat flux intensity refers to a value within the maximum or minimum range of the heat flux intensity in the distribution density map. The maximum range refers to the range where the heat flux rate per unit area is greater than or equal to 800 W / m², and the minimum range refers to the range where the heat flux rate per unit area is less than or equal to 200 W / m². The target area refers to a continuous spatial region within the spatial coordinate range of the temperature measurement point cluster where the heat flux intensity is at its extreme value. This region must satisfy the requirement that its spatial volume is greater than a preset volume threshold, which is 100 cubic mm (i.e., 10 mm * 10 mm * 1 mm). Optionally, the specific determination process in this embodiment of the invention is as follows: the temperature field control device extracts the heat flux intensity data of the portion overlapping with the spatial coordinate range of the temperature measurement point cluster from the distribution density map, and filters out the spatial coordinates corresponding to the values ​​within the extreme value range.

[0073] Furthermore, the regions covered by adjacent spatial coordinates with extreme heat flux intensity are merged to form continuous candidate regions; the spatial volume of each candidate region is calculated, and the candidate regions with spatial volumes greater than a preset volume threshold are determined as the target regions with extreme heat flux intensity in the temperature measurement point cluster region.

[0074] Step 1033: Based on the set of intersection segments and the temperature difference between the inside and outside of the closed area connected at both ends of the intersection segment, obtain the temperature asymmetry index of the inlet and outlet sides of each closed area in the direction of heat flow, and determine the closed area with the temperature asymmetry index greater than the preset threshold as the candidate non-uniform area.

[0075] Optionally, the temperature field control device determines the enclosed region corresponding to each intersection segment, and the positions inside and outside the enclosed region corresponding to the two ends of the intersection segment, respectively. The two ends of the intersection segment refer to the two endpoints of the intersection segment, namely the inlet endpoint where the heat flow line enters the enclosed region and the outlet endpoint where it leaves the enclosed region. The spatial position corresponding to the inlet endpoint is inside the enclosed region, and the spatial position corresponding to the outlet endpoint is outside the enclosed region (or vice versa).

[0076] Furthermore, based on the positions of the interior and exterior of the closed areas connected at both ends of the intersection segment, the temperature field control device extracts the corresponding temperature values. The temperature value inside the closed area is obtained from the temperature value of the corresponding coordinate point in the surface radiation temperature distribution image, and the temperature value outside the closed area is obtained from the temperature value of the corresponding coordinate point at the outlet endpoint in the same surface radiation temperature distribution image. Based on the extracted internal and external temperature values, the temperature field control device obtains the temperature asymmetry index of the inlet and outlet sides of each closed area in the heat flow crossing direction. Here, the heat flow crossing direction refers to the direction in which the heat flow line crosses the boundary of the closed area through the intersection segment, that is, the direction from the inlet endpoint to the outlet endpoint; the inlet side refers to the side of the closed area where the inlet endpoint of the intersection segment is located in the heat flow crossing direction, and the outlet side refers to the side of the closed area where the outlet endpoint of the intersection segment is located in the heat flow crossing direction; the temperature asymmetry index refers to the absolute value of the difference between the inlet side temperature value and the outlet side temperature value, which is used to characterize the degree of temperature distribution asymmetry of the closed area in the heat flow crossing direction.

[0077] Optionally, the specific calculation process of this embodiment of the invention is as follows: for each intersection segment corresponding to each closed region, extract the temperature value corresponding to the inlet side and the temperature value corresponding to the outlet side; calculate the difference between the two temperature values, take the absolute value of the difference, and obtain the temperature asymmetry sub-index corresponding to the intersection segment; perform an arithmetic mean calculation on the temperature asymmetry sub-index corresponding to all intersection segments of the same closed region. Specifically, the arithmetic mean calculation is to add the values ​​of all sub-indexes and then divide by the number of sub-indexes to obtain the temperature asymmetry index of each closed region in the heat flow crossing direction.

[0078] Optionally, a preset temperature asymmetry threshold is determined based on the temperature distribution uniformity requirements under normal mold operation, with a value range of up to 10℃. The temperature asymmetry index of each enclosed region is compared with the preset temperature asymmetry threshold, and enclosed regions with temperature asymmetry indices greater than the preset threshold are identified as candidate non-uniform regions. Candidate non-uniform regions refer to surface areas initially identified as potentially having abnormal temperature gradients; these regions require further confirmation based on internal heat flow and temperature distribution. The specific determination process is as follows: the temperature field control device traverses all enclosed regions, comparing the temperature asymmetry index of each enclosed region with the preset threshold; when the temperature asymmetry index of a certain enclosed region exceeds the preset threshold, that enclosed region is marked as a candidate non-uniform region.

[0079] Step 1034: Identify non-uniform regions based on the geometric inclusion relationship between the target region and candidate non-uniform regions in three-dimensional space.

[0080] Optionally, the temperature field control device identifies the non-uniform region based on the geometric inclusion relationship between the target region and the candidate non-uniform region in three-dimensional space, as described in steps 10341 to 10344.

[0081] This invention integrates multi-dimensional data on surface temperature distribution, internal discrete point temperature, and heat flow direction and intensity by correlating surface heat flow with region correlation, internal heat flow with point cluster correlation, quantitative screening of surface temperature asymmetry, and collaborative verification of internal and external regions. This ensures that the identified non-uniform regions contain both abnormal surface temperature characteristics and internal heat flow turbulence attributes, thereby achieving accurate positioning of abnormal temperature gradient regions and realizing high-precision perception and dynamic collaborative control of the entire temperature field of the injection mold.

[0082] Optionally, the process of steps 10341 to 10344 includes: Step 10341: Based on the geometric inclusion relationship between the target region and the candidate non-uniform region in three-dimensional space, an initial spatial region subset that satisfies the conditions of temperature asymmetry and heat flow intensity anomaly is obtained. Based on the actual volume occupied by the initial spatial region subset in the mold entity structure, regions with volumes smaller than the minimum adjustable unit volume are excluded to obtain the target spatial region subset.

[0083] Optionally, the temperature field control device retrieves the target area and candidate non-uniform areas, and extracts their respective three-dimensional spatial coordinate ranges. The three-dimensional spatial coordinate range refers to the X-axis, Y-axis, and Z-axis coordinate intervals of the area within the mold's three-dimensional spatial coordinate system. The mold's three-dimensional spatial coordinate system is a three-dimensional rectangular coordinate system established with the geometric center of the mold cavity as the origin, the horizontal direction parallel to the mold parting surface as the X-axis, the horizontal direction perpendicular to the mold parting surface as the Y-axis, and the mold depth direction perpendicular to the parting surface as the Z-axis.

[0084] Furthermore, based on the aforementioned three-dimensional spatial coordinate range, the temperature field control device analyzes the geometric inclusion relationship between the target region and the candidate non-uniform regions in three-dimensional space. The geometric inclusion relationship is specifically divided into three types: complete inclusion, partial overlap, and no overlap. Complete inclusion means that the X-axis, Y-axis, and Z-axis coordinate intervals of the target region are all completely within the coordinate intervals corresponding to the candidate non-uniform regions. Partial overlap means that at least one coordinate axis interval of the target region and the candidate non-uniform regions overlaps. No overlap means that the X-axis, Y-axis, and Z-axis coordinate intervals of both regions do not overlap. The specific analysis process is as follows: the temperature field control device compares the X-axis, Y-axis, and Z-axis coordinate intervals of the target region with each candidate non-uniform region one by one, determines the intersection of each coordinate axis interval, and thus determines the type of geometric inclusion relationship between the two regions.

[0085] Furthermore, based on the geometric inclusion relationship analysis results, the temperature field control device screens out an initial spatial region subset that satisfies the conditions of temperature asymmetry and heat flux intensity anomaly. The temperature asymmetry and heat flux intensity anomaly conditions refer to a geometric inclusion relationship where the target region and the candidate non-uniform region completely contain or partially overlap. This condition indicates that the region simultaneously possesses the temperature asymmetry anomaly characteristics of the candidate non-uniform region and the heat flux intensity anomaly characteristics of the target region. The initial spatial region subset refers to the set of all intersection regions between the target region and the corresponding candidate non-uniform region that satisfy the above conditions.

[0086] Optionally, the specific screening process in this embodiment of the invention is as follows: for target regions and candidate non-uniform regions that have a complete inclusion relationship, the target region is included as the intersection region in the initial spatial region subset; for target regions and candidate non-uniform regions that have a partial overlap relationship, the intersection of their coordinate intervals is calculated to obtain the overlapping region, and the overlapping region is included as the intersection region in the initial spatial region subset; for regions without an overlap relationship, they are directly excluded and not included in the initial spatial region subset.

[0087] Furthermore, the temperature field control device determines the minimum adjustable unit volume, which refers to the minimum spatial volume in which subsequent heating and cooling units can achieve effective temperature control. This volume is determined based on the structural dimensions of the heating and cooling units, the control power, and the thermal conductivity of the mold material, and ranges from 50 cubic meters to 100 cubic millimeters (corresponding to spatial dimensions of approximately 3.7mm*3.7mm*3.7 to 4.6mm*4.6mm*4.6mm). Based on the actual volume occupied by the initial spatial region subset in the mold's solid structure, the temperature field control device excludes regions with volumes smaller than the minimum adjustable unit volume, obtaining the target spatial region subset. The actual occupied volume refers to the volume of each intersection region within the initial spatial region subset in the mold's three-dimensional space, calculated as the product of the lengths of the X-axis, Y-axis, and Z-axis coordinate intervals of that region. The target spatial region subset refers to the set of intersection regions within the initial spatial region subset whose actual occupied volume is greater than or equal to the minimum adjustable unit volume.

[0088] Optionally, the specific execution process is as follows: the temperature field control device calculates the actual occupied volume of each intersection region within the initial spatial region subset; the actual occupied volume of each intersection region is compared with the volume of the minimum controllable unit; the intersection regions whose actual occupied volume is greater than or equal to the volume of the minimum controllable unit are retained, and the regions whose volume is less than the volume of the minimum controllable unit are removed, thus forming the target spatial region subset.

[0089] Step 10342, based on the pixel connectivity features of the target spatial region subset and its boundary contour in the surface radiation temperature distribution image, obtains the closed contour line of the projection of each target spatial region onto the mold surface.

[0090] Optionally, the temperature field control device retrieves a subset of the target spatial region, extracts the three-dimensional spatial coordinate range of each target spatial region, and determines the projection range of each target spatial region on the mold surface. Here, the mold surface refers to the outer surface of the mold (a plane with a Z-axis coordinate of 0mm); the projection range refers to the two-dimensional coordinate range formed after projecting the X-axis and Y-axis coordinate intervals of the target spatial region onto the mold surface (Z-axis = 0mm). Specifically, for each target spatial region, the maximum and minimum values ​​of the X-axis and Y-axis in its three-dimensional coordinates are extracted to form a two-dimensional coordinate interval (Xmin, Xmax) * (Ymin, Ymax). This two-dimensional coordinate interval is the projection range of the target spatial region on the mold surface.

[0091] Furthermore, the temperature field control device retrieves the surface radiation temperature distribution image and matches the surface projection range of the target spatial region with the pixel coordinates of the surface radiation temperature distribution image. Here, pixel coordinates refer to the two-dimensional coordinates of each pixel in the surface radiation temperature distribution image. Matching is achieved through a mapping relationship between image pixels and the actual dimensions of the mold surface. This mapping relationship refers to the actual length of the mold surface corresponding to each pixel in the image, with a value ranging from 0.1 mm / pixel to 0.5 mm / pixel; that is, one pixel in the image corresponds to an actual length of 0.1 to 0.5 mm on the mold surface. Specifically, the matching process is as follows: based on the mapping relationship, the actual X-axis and Y-axis coordinate ranges of the projection range are converted into pixel coordinate ranges of the surface radiation temperature distribution image, obtaining the pixel region corresponding to the projection range of each target spatial region.

[0092] Furthermore, based on the pixel connectivity features of the target spatial region subset and its boundary contour in the surface radiation temperature distribution image, the temperature field control device obtains the closed contour line projected onto the mold surface of each target spatial region. Here, the boundary contour refers to the edge contour of the pixel region corresponding to the projection range of the target spatial region; the pixel connectivity feature refers to the characteristic that pixels of the edge contour are interconnected in the image to form continuous lines, specifically, the gray values ​​of adjacent pixels (including those adjacent in horizontal, vertical, and diagonal directions) satisfy a preset contour judgment threshold, and the gray value has a linear correspondence with the temperature value. The contour judgment threshold is the critical gray value that can distinguish contour pixels from non-contour pixels, and this threshold is determined based on the gray range of the surface radiation temperature distribution image and the temperature change boundary features; the closed contour line refers to a closed line formed by the continuous connection of edge pixels with pixel connectivity features, with the starting and ending points of the line coinciding, completely enclosing the surface projection range of the target spatial region.

[0093] Optionally, the specific acquisition process in this embodiment of the invention is as follows: the temperature field control device uses a contour extraction algorithm to perform edge detection on the pixel region corresponding to the target spatial region. The contour extraction algorithm specifically involves: traversing each pixel point within the pixel region and calculating the gray value difference between the pixel point and its 8 neighboring pixels; when the gray value difference is greater than a preset contour judgment threshold, the pixel point is marked as a contour pixel point; all contour pixels are connected in spatial order, and discontinuous isolated pixels are removed to ensure that the connected lines form a closed structure, and finally, the closed contour line projected on the mold surface of each target spatial region is obtained.

[0094] Step 10343: Based on the spatial arrangement features of two or more local temperature maxima in the internal pixel temperature distribution surrounded by the closed contour line, determine the multi-temperature peak region; and based on the structural features of continuous temperature plateau segments interrupted by discontinuous jumps in the internal pixel temperature distribution surrounded by the closed contour line, determine the temperature break region.

[0095] Optionally, the temperature field control device retrieves the closed contour line of each target spatial region and determines the internal pixel region enclosed by the closed contour line. The internal pixel region refers to the area composed of all pixels enclosed by the closed contour line, that is, the entire pixel range corresponding to the target spatial region in the surface radiation temperature distribution image.

[0096] Furthermore, the temperature field control device extracts the temperature distribution data of the internal pixel region enclosed by the closed contour line. The temperature distribution data refers to the temperature value corresponding to each pixel in the region. This value is obtained by linearly transforming the gray value of the surface radiation temperature distribution image. The transformation relationship is: temperature value = gray value * temperature conversion coefficient + reference temperature, where the temperature conversion coefficient is the temperature change corresponding to a unit gray value, and the reference temperature is the actual temperature corresponding to a gray value of 0.

[0097] Furthermore, based on the spatial arrangement characteristics of two or more local temperature maxima within the internal pixel temperature distribution enclosed by a closed contour line, the temperature field control device determines a multi-temperature peak region. Here, a local temperature maxima refers to a pixel whose temperature value is greater than the temperature values ​​of all its neighboring pixels within a preset neighborhood (the preset neighborhood range is 3*3 pixels to 5*5 pixels, corresponding to actual sizes of 0.3mm*0.3 to 2.5mm*2.5mm). The spatial arrangement characteristics refer to the distribution of two or more local temperature maxima within the internal pixel region, requiring an actual distance between the maxima to be greater than or equal to 2mm to avoid adjacent false maxima caused by measurement errors. A multi-temperature peak region refers to an internal pixel region containing two or more local temperature maxima that satisfy the spatial arrangement characteristics, where the temperature distribution exhibits a multi-center high-temperature aggregation feature.

[0098] Optionally, the specific determination process is as follows: the temperature field control device traverses each pixel in the internal pixel region, selects a preset neighborhood range with each pixel as the center, and compares the temperature values ​​of the center pixel with those of other pixels in the neighborhood; when the temperature value of the center pixel is greater than that of all other pixels in the neighborhood, the point is marked as a local temperature maximum point; the number of local temperature maximum points in the internal pixel region is counted, and the actual distance between each maximum point is calculated; when the number of maximum points reaches two or more, and the actual distance between any two maximum points is greater than or equal to 2mm, the internal pixel region containing these maximum points is determined as a multi-temperature peak region.

[0099] Furthermore, based on the structural feature corresponding to the region in the internal pixel temperature distribution enclosed by a closed contour line where a continuous temperature plateau segment is interrupted by a discontinuous jump, the temperature field control device determines the temperature break region. Here, a continuous temperature plateau segment refers to a pixel segment in the internal pixel region where the temperature values ​​of multiple consecutive pixels remain within a preset fluctuation range, which is 0.5 degrees Celsius to 1 degree Celsius; that is, the temperature difference between consecutive pixels does not exceed this range. A discontinuous jump refers to a pixel temperature value after a continuous temperature plateau segment whose temperature difference with the pixel value at the end of the plateau segment is greater than a preset jump threshold, which is 3 degrees Celsius to 5 degrees Celsius. This difference reflects a sudden temperature change over a short distance. The structural feature refers to the temperature distribution pattern where the continuous temperature plateau segment and the discontinuous jump occur sequentially. The temperature break region refers to a region in the internal pixel region containing the above structural features, where the temperature distribution exhibits a discontinuous, broken state.

[0100] Optionally, the specific determination process is as follows: the temperature field control device traverses the temperature distribution data of the internal pixel region and extracts the temperature values ​​of consecutive pixels in the order of pixel arrangement; it determines whether the temperature values ​​of consecutive pixels meet the preset fluctuation range and filters out all consecutive temperature plateau segments; for each consecutive temperature plateau segment, it detects the temperature values ​​of its subsequent adjacent pixels and calculates the temperature difference with the pixel at the end of the plateau segment; when the temperature difference is greater than the preset jump threshold, it is determined that there is a structural feature of discontinuous jump interruption; the internal pixel region containing the structural feature is determined as the temperature break region, and the position, length and temperature difference of discontinuous jump of the continuous temperature plateau segment are recorded.

[0101] Step 10344: The regions where the local temperature gradient vectors in the multi-temperature peak region exhibit directional divergence, and the regions where the local temperature gradient vectors in the temperature fracture region exhibit abrupt changes in direction or a sudden increase in amplitude, are identified as non-uniform regions.

[0102] Optionally, for regions with multiple temperature peaks, the temperature field control device analyzes the regions where the local temperature gradient vector exhibits a divergent physical characteristic. This divergent physical characteristic refers to the local temperature gradient vector within the region radiating and spreading from multiple local temperature maxima to the surrounding area. The angle between the directions of the local temperature gradient vectors corresponding to any two adjacent maxima is greater than a preset divergence threshold, which is between 90 and 120 degrees. This characteristic indicates that the temperature transfer direction within the region diffuses outward from multiple high-temperature centers, demonstrating significant temperature gradient disorder.

[0103] Optionally, the specific analysis process of this embodiment of the invention is as follows: extract the local temperature gradient vector of all temperature measurement points in the multi-temperature peak area; take each local temperature maximum point as the center and analyze the direction of the local temperature gradient vector of the surrounding temperature measurement points; calculate the angle between the directions of the local temperature gradient vectors of the surrounding temperature measurement points of any two adjacent maximum points; filter out the areas where the angle between the directions is greater than the preset divergence threshold, that is, obtain the area in the multi-temperature peak area where the local temperature gradient vector exhibits the physical characteristic of directional divergence.

[0104] Furthermore, for the temperature fracture region, the temperature field control device analyzes the areas where the local temperature gradient vector exhibits physical characteristics such as abrupt changes in direction or a sudden increase in amplitude. Abrupt change in direction refers to an angle between the local temperature gradient vector at a certain temperature measuring point within the temperature fracture region and the local temperature gradient vectors at adjacent temperature measuring points exceeding a preset abrupt change threshold (60 to 90 degrees), indicating a drastic change in the direction of temperature transmission. A sudden increase in amplitude refers to a difference in amplitude between the local temperature gradient vector at a certain temperature measuring point within the temperature fracture region and the amplitudes at adjacent temperature measuring points exceeding a preset amplitude threshold (4 to 6 degrees Celsius per mm), indicating a sudden and significant increase in the rate of temperature change. Both of these physical characteristics reflect the existence of severe temperature gradient anomalies within the temperature fracture region.

[0105] Optionally, the specific analysis process is as follows: extract the local temperature gradient vector of all temperature measuring points within the temperature fracture area; calculate the angle between the directions and the difference in amplitude of the local temperature gradient vectors of any two adjacent temperature measuring points; filter out areas where the angle between the directions is greater than a preset abrupt change threshold or the difference in amplitude is greater than a preset amplitude threshold, thus obtaining the areas within the temperature fracture area where the local temperature gradient vector exhibits the physical characteristics of abrupt change in direction or a sudden increase in amplitude.

[0106] Furthermore, the temperature field control device identifies regions where the local temperature gradient vectors in the multi-temperature peak region exhibit directional divergence, and regions where the local temperature gradient vectors in the temperature fracture region exhibit abrupt changes in direction or a sudden increase in amplitude, as non-uniform regions.

[0107] The embodiments of the present invention accurately locate regions that simultaneously exhibit abnormal temperature distribution and gradient, ensuring that the identification results can accurately match subsequent heat flow control requirements, guaranteeing the effectiveness and stability of mold temperature field uniformity control, and realizing high-precision perception and dynamic collaborative control of the entire temperature field of the injection mold.

[0108] Optionally, the processes of steps 201 to 204 include: Step 201: Determine the local influence direction of each heating and cooling unit on the non-uniform region by using the installation orientation of the heating and cooling unit associated with each non-uniform region in the mold entity structure and the spatial relative position of the boundary of the non-uniform region.

[0109] Optionally, the constructed spatial mapping relationship can be retrieved to extract the heating and cooling unit information associated with each non-uniform region and the spatial coordinate range of the non-uniform region. Here, the heating and cooling unit refers to the mold-built heating and cooling units located no more than 20mm from the edge of the non-uniform region. The heating unit is a rod-type heater using electric heating, and the cooling unit is a cooling assembly with built-in cooling channels and temperature control valves. The installation orientation of the heating and cooling unit in the mold's physical structure refers to the specific installation position and orientation of the heating and cooling unit in the mold's three-dimensional spatial coordinate system. The mold's three-dimensional spatial coordinate system is a three-dimensional rectangular coordinate system established with the geometric center of the mold cavity as the origin, the direction horizontally parallel to the mold parting surface as the X-axis, the direction horizontally perpendicular to the mold parting surface as the Y-axis, and the mold depth direction perpendicular to the parting surface as the Z-axis.

[0110] Furthermore, the temperature field control device determines the spatial relative position of each heating / cooling unit and the boundary of the non-uniform region. The boundary of the non-uniform region refers to the contour edge of the non-uniform region, composed of three-dimensional spatial coordinate points. The spatial relative position refers to the three-dimensional spatial distance and orientation relationship between the geometric center of the heating / cooling unit and each point on the boundary of the non-uniform region. The three-dimensional spatial distance is obtained through the formula for calculating the three-dimensional spatial distance between two points, which is the square root of the sum of the squares of the differences in the X-axis, Y-axis, and Z-axis coordinates of the two positions. The orientation relationship is characterized by the azimuth angle of the geometric center of the heating / cooling unit relative to the boundary of the non-uniform region.

[0111] Furthermore, based on the aforementioned installation orientation and spatial relative position, the temperature field control device determines the local influence direction of the thermal effect applied by each heating and cooling unit to the non-uniform region. Here, thermal effect refers to the heat transfer generated by the heating unit or the heat absorption generated by the cooling unit; the local influence direction refers to the direction of heat transfer within the non-uniform region when the heating and cooling units apply thermal effect. This direction is perpendicular to the boundary of the non-uniform region from the geometric center of the heating and cooling unit. If it is a heating unit, the local influence direction points towards the interior of the non-uniform region; if it is a cooling unit, the local influence direction points from the interior of the non-uniform region towards the cooling unit. Specifically, the determination process is as follows: for each heating and cooling unit, the perpendicular line from its geometric center to the boundary of the non-uniform region is calculated. Based on the perpendicular line direction and combined with the type of heating and cooling unit (heating or cooling), the local influence direction is determined.

[0112] Step 202: Based on the vector pointing information of the instantaneous heat flow direction at various locations within each non-uniform region, the main heat flow crossing axis through the non-uniform region is obtained.

[0113] Optionally, the temperature field control device retrieves instantaneous heat flow direction data and extracts vector pointing information at various locations within each non-uniform region. Here, "various locations within the non-uniform region" refers to several sampling points selected within the non-uniform region at preset sampling intervals, with the sampling interval ranging from 2 to 5 mm to ensure comprehensive coverage of the non-uniform region. Vector pointing information refers to the specific orientation of the instantaneous heat flow direction in the mold's three-dimensional coordinate system, characterized by the angle between the vector and the coordinate axes.

[0114] Furthermore, based on the aforementioned vector pointing information, the temperature field control device obtains the main heat flow crossing axis that traverses the non-uniform region. Here, the main heat flow crossing axis refers to a virtual straight line characterizing the dominant heat flow transfer path within the non-uniform region. This line can penetrate both ends of the non-uniform region, and the direction of any point on the line is consistent with the mainstream direction of the instantaneous heat flow vector pointing information at that point; the mainstream direction refers to the concentrated direction of the instantaneous heat flow vector pointing information at most sampling points within the non-uniform region.

[0115] Optionally, the specific acquisition process of this embodiment of the invention is as follows: statistical analysis is performed on the instantaneous heat flow vector pointing information of all sampling points in the non-uniform region, and the vector pointing direction with a proportion of more than 60% is selected as the mainstream direction using the directional clustering method; two feature points located at the two ends of the non-uniform region are selected in the mainstream direction, and the feature points are the intersection points of the non-uniform region boundary in this direction; the two feature points are connected by a straight line to obtain the main heat flow crossing axis that runs through the non-uniform region.

[0116] Step 203: Based on the coordinate positions of the starting and ending points of the main heat flow crossing the axis located on the boundary of the non-uniform region, the entry and exit points of the heat flow into the side boundary section and the exit points of the heat flow from the side boundary section are identified.

[0117] Optionally, the temperature field control device retrieves the main heat flow crossing axis and determines the coordinate positions of the start and end points of the axis on the boundary of the non-uniform region. The start point refers to the endpoint on the side where the heat flow enters the non-uniform region along the main heat flow crossing axis, and the end point refers to the endpoint on the side where the heat flow leaves the non-uniform region. The determination of the start and end points is based on the vector direction information of the instantaneous heat flow, i.e., the vector direction points from the start point to the end point.

[0118] Furthermore, based on the coordinates of the starting and ending points, the temperature field control device identifies the heat flow entry side boundary segment and the heat flow exit side boundary segment. The heat flow entry side boundary segment refers to the boundary line segment on the boundary of the non-uniform region, centered on the starting point and with a preset length. The preset length is determined according to the size of the non-uniform region and ranges from 5 to 10 mm. The heat flow exit side boundary segment refers to the boundary line segment on the boundary of the non-uniform region, centered on the ending point and with the same preset length.

[0119] Optionally, the specific identification process of this embodiment of the invention is as follows: taking the starting point of the main heat flow through the axis as the center, extending half a preset length to both sides along the boundary of the non-uniform region to form the heat flow entering the side boundary segment; taking the ending point as the center, extending half a preset length to both sides along the boundary of the non-uniform region to form the heat flow leaving the side boundary segment; extracting the three-dimensional spatial coordinate range of the two boundary segments to complete the identification.

[0120] Step 204: Generate heat flow path guidance instructions based on the local influence direction, heat flow entering the side boundary segment, and heat flow leaving the side boundary segment.

[0121] Optionally, the temperature field control device generates heat flow path guidance instructions based on the local influence direction, the heat flow entering the side boundary section, and the heat flow leaving the side boundary section, as in steps 2041 to 2044.

[0122] The embodiments of the present invention generate heat flow path guidance instructions with clear directionality and pertinence through the fusion analysis of multi-dimensional heat flow and spatial information. These instructions can guide the heating and cooling units to work together, enabling the heat flow to migrate directionally along a specified path in a non-uniform region, thus ensuring the effectiveness and accuracy of the control actions.

[0123] Optionally, the process of steps 2041 to 2044 includes: Step 2041: Based on the heat flux intensity information, determine the heat flux input intensity level at the unit area heat flux rate at the heat flux entry side boundary section, and based on the heat flux intensity information, determine the heat flux output intensity level at the unit area heat flux rate at the heat flux exit side boundary section.

[0124] Optionally, the temperature field control device first obtains the heat flux intensity information and extracts the unit area heat flux rate values ​​at the points where the heat flux enters and leaves the side boundary section. Here, heat flux intensity refers to the heat flow rate per unit area of ​​the mold per unit time; unit area heat flux rate refers to the heat flow rate per unit area of ​​the mold per unit time, expressed in W / m²; the unit area heat flux rate value at the side boundary section refers to the measured value of the unit area heat flux rate at all sampling points on that boundary section, and the value at the side boundary section is obtained similarly. Sampling points are selected according to a preset sampling interval, with the sampling interval ranging from 2 to 5 mm.

[0125] Furthermore, the temperature field control device determines the heat flow input intensity level based on the heat flow rate per unit area at the heat flow entry boundary section. The heat flow input intensity level refers to the classification and definition of the intensity of heat flow entering the non-uniform region, used to quantify the magnitude of the heat flow entry intensity. The specific determination process is as follows: a preset heat flow intensity classification standard is established, divided into three levels based on the heat flow rate per unit area: Level 1 is 0 to 300 W / m² (low intensity), Level 2 is 300 to 600 W / m² (medium intensity), and Level 3 is 600 to 1000 W / m² (high intensity); the arithmetic mean of the heat flow rate per unit area at all sampling points at the heat flow entry boundary section is calculated by adding the values ​​of all sampling points and dividing by the number of sampling points; the calculated arithmetic mean is compared with the preset heat flow intensity classification standard to determine the corresponding heat flow input intensity level.

[0126] Similarly, the temperature field control device determines the heat flow output intensity level based on the heat flow rate per unit area at the heat flow departure boundary section from the heat flow intensity information. The heat flow output intensity level refers to the classification of the intensity of heat flow leaving the non-uniform region, and its classification standard is completely consistent with the classification standard of the heat flow input intensity level. The specific determination process is as follows: calculate the arithmetic mean of the heat flow rate per unit area at all sampling points at the heat flow departure boundary section, compare this average value with the preset heat flow intensity classification standard, and determine the corresponding heat flow output intensity level.

[0127] Step 2042: Based on the difference between the heat flow input intensity level and the heat flow output intensity level, determine whether the current heat flow is in a net accumulation state or a net dissipation state in the non-uniform region, and obtain the state result.

[0128] Optionally, the temperature field control device retrieves the heat flux input intensity level and the heat flux output intensity level, calculates the difference between the average heat flux rate per unit area corresponding to the two levels, and obtains the intensity difference between the heat flux input and output. The intensity difference refers to the result of subtracting the average heat flux rate per unit area corresponding to the heat flux output intensity level from the average heat flux rate per unit area corresponding to the heat flux input intensity level.

[0129] Furthermore, based on the aforementioned intensity difference, the temperature field control device determines whether the current heat flow is in a net accumulation state or a net dissipation state in the non-uniform region, and obtains the state result.

[0130] Among them, the net accumulation state refers to a state where the intensity of heat flow entering a non-uniform region is greater than the intensity of heat flow leaving the region, resulting in an accumulation and increase of heat within the region; the net dissipation state refers to a state where the intensity of heat flow entering the region is less than the intensity of heat flow leaving the region, resulting in a decrease and dissipation of heat within the region; the state result refers to the judgment conclusion of the above two states. The specific judgment process is as follows: the preset intensity difference judgment threshold is 0, that is, when the intensity difference is greater than 0, it is judged as the net accumulation state; when the intensity difference is less than 0, it is judged as the net dissipation state; when the intensity difference is equal to 0, it is judged as the heat flow equilibrium state, which means that the intensity of heat flow entering and leaving the region is equal, and there is no significant increase or decrease in heat within the region.

[0131] Step 2043: Based on the spatial consistency comparison between the local influence direction and the spatial position of the heat flow entry side boundary segment, a heat flow inlet control unit group located on the heat flow entry side with its local influence direction pointing towards the non-uniform region is obtained. Based on the spatial consistency comparison between the local influence direction and the spatial position of the heat flow exit side boundary segment, a heat flow outlet control unit group located on the heat flow exit side with its local influence direction deviating from the non-uniform region is obtained.

[0132] Optionally, the temperature field control device retrieves the local influence direction of each heating and cooling unit, as well as the spatial coordinate range of heat flow entering and leaving the side boundary section. Here, the heating and cooling unit refers to the mold-built-in heating and cooling units located no more than 20mm from the edge of the non-uniform region. The heating unit is a rod-type heater using electric heating, and the cooling unit is a cooling assembly with built-in cooling channels and temperature control valves. The spatial coordinate range refers to the X-axis, Y-axis, and Z-axis coordinate intervals of the boundary section in the mold's three-dimensional spatial coordinate system. The mold's three-dimensional spatial coordinate system is a three-dimensional rectangular coordinate system established with the geometric center of the mold cavity as the origin, the direction horizontally parallel to the mold parting surface as the X-axis, the direction horizontally perpendicular to the mold parting surface as the Y-axis, and the mold depth direction perpendicular to the parting surface as the Z-axis.

[0133] Furthermore, based on the spatial position of the local influence direction and the heat flow entry side boundary segment, a direction consistency comparison is performed. The temperature field control device obtains a heat flow inlet control unit group located on the heat flow entry side with its local influence direction pointing into the non-uniform region. Here, the direction consistency comparison refers to determining whether the local influence direction of the heating / cooling unit is consistent with the direction of the heat flow entering the non-uniform region. The heat flow entry direction is the direction from the starting point to the ending point of the main heat flow crossing axis. "Located on the heat flow entry side" means that the geometric center of the heating / cooling unit is located around the spatial region corresponding to the heat flow entry side boundary segment, within 10 mm of the edge of that boundary segment. The heat flow inlet control unit group refers to the set of all heating / cooling units that meet the above position and direction conditions. The specific comparison and selection process is as follows: calculate the angle between the local influence direction and the heat flow entry direction of each heating / cooling unit; when the angle is less than or equal to 30 degrees, the direction is considered consistent; simultaneously determine whether the heating / cooling unit is located on the heat flow entry side; select heating / cooling units with consistent direction, located on the heat flow entry side, and whose local influence direction points into the non-uniform region to form the heat flow inlet control unit group.

[0134] Similarly, based on the directional consistency comparison between the local influence direction and the spatial position of the heat flow departure side boundary segment, the temperature field control device obtains a heat flow outlet control unit group located on the heat flow departure side and whose local influence direction is away from the non-uniform region. Here, the heat flow departure direction is the direction from the starting point to the end of the main heat flow crossing axis; "located on the heat flow departure side" means that the geometric center of the heating / cooling unit is located around the spatial region corresponding to the heat flow departure side boundary segment, within 10mm of the edge of that boundary segment; "local influence direction away from the non-uniform region" means that the thermal action direction of the heating / cooling unit points from the inside of the non-uniform region to the unit itself; the heat flow outlet control unit group refers to the set of all heating / cooling units that meet the above position and direction conditions. The specific comparison and selection process is as follows: calculate the angle between the local influence direction and the heat flow departure direction of each heating / cooling unit; when the angle is less than or equal to 30 degrees, the direction is considered consistent; simultaneously determine whether the heating / cooling unit is located on the heat flow departure side; select heating / cooling units with consistent direction, located on the heat flow departure side, and whose local influence direction is away from the non-uniform region to form the heat flow outlet control unit group.

[0135] Step 2044: Based on the status results and the heat flow inlet control unit group and the heat flow outlet control unit group, generate heat flow path guidance instructions.

[0136] Optionally, the temperature field control device generates a heat flow path guidance instruction based on the state results and the heat flow inlet control unit group and the heat flow outlet control unit group, as described in steps 20441 to 20444.

[0137] The heat flow path guidance command generated by the embodiments of the present invention can accurately match the heat flow state of non-uniform regions, guide the heating and cooling units to work together, ensure that the heat flow migrates in a directional manner along the specified path, improve the abnormal temperature gradient in the region, and realize high-precision perception and dynamic collaborative control of the temperature field of the entire injection mold.

[0138] Optionally, the process of steps 20441 to 20444 includes: Step 20441: Based on the state result of being in the net accumulation state and combined with the heat flow outlet control unit group, generate a first initial guidance signal for performing a cooling action on the heat flow outlet control unit group, and based on the state result of being in the net dissipation state and combined with the heat flow inlet control unit group, generate a second initial guidance signal for performing a heating action on the heat flow inlet control unit group.

[0139] Optionally, when the state result is a net accumulation state, the temperature field control device generates a first initial guidance signal for executing a cooling action on the heat flow outlet control unit group based on this state result and the heat flow outlet control unit group. The first initial guidance signal is a signal used to initially instruct the heat flow outlet control unit group to execute a cooling action. This signal contains instruction information on the action type (cooling), but does not yet include action intensity and timing information. Executing a cooling action means controlling the cooling unit to open the temperature control valve in the cooling channel, introducing cooling medium to absorb the heat accumulated in the non-uniform region, accelerating the heat flow out from the heat flow exit side boundary section, and alleviating the heat accumulation state. Specifically, after the temperature field control device identifies the state result as a net accumulation state, it locks all cooling units in the heat flow outlet control unit group (the heat flow outlet control unit group is composed of cooling units, and its local influence direction is away from the interior of the non-uniform region, adapting to cooling and heat dissipation requirements), and generates a first initial guidance signal containing the unit group identifier and the cooling action type.

[0140] Furthermore, when the state result is a net dissipation state, the temperature field control device, based on this state result and in conjunction with the heat flow inlet control unit group, generates a second initial guidance signal to execute a heating action on the heat flow inlet control unit group. This second initial guidance signal is a signal used to initially instruct the heat flow inlet control unit group to execute a heating action. This signal contains instruction information on the action type (heating), but does not yet include action intensity and timing information. Executing the heating action means controlling the heating unit to activate its electric heating function, generating heat and transferring it to the non-uniform region to replenish the dissipated heat within the region, enhance the heat flow input intensity, and alleviate the heat dissipation state. Specifically, after the temperature field control device identifies the state result as a net dissipation state, it locks all heating units in the heat flow inlet control unit group (the heat flow inlet control unit group consists of heating units, and its local influence direction points towards the non-uniform region, adapting to heating and heat replenishment needs), and generates a second initial guidance signal containing the unit group identifier and the heating action type.

[0141] Furthermore, when the state result is a heat flow balance state, the temperature field control device does not generate the first initial guidance signal and the second initial guidance signal, and maintains the current operating state of the heat flow inlet control unit group and the heat flow outlet control unit group to maintain heat flow balance.

[0142] Step 20442: Based on the target heating and cooling unit group corresponding to the first initial guidance signal and the second initial guidance signal, and combined with the projection position of each unit in the target heating and cooling unit group along the main heat flow path along the physical arrangement order of each unit in the mold structure, the sequential order of each unit along the heat flow path is obtained.

[0143] Optionally, the temperature field control device retrieves a first initial guidance signal or a second initial guidance signal to determine the target heating and cooling unit group corresponding to the signal. The target heating and cooling unit group refers to the heat flow outlet control unit group corresponding to the first initial guidance signal, or the heat flow inlet control unit group corresponding to the second initial guidance signal. The temperature field control device extracts the physical arrangement position of each unit within the target heating and cooling unit group in the mold structure, as well as the main heat flow crossing axis. The physical arrangement position refers to the geometric center coordinates of each unit in the mold's three-dimensional spatial coordinate system. The mold's three-dimensional spatial coordinate system is a three-dimensional rectangular coordinate system established with the geometric center of the mold cavity as the origin, the direction horizontally parallel to the mold parting surface as the X-axis, the direction horizontally perpendicular to the mold parting surface as the Y-axis, and the mold depth direction perpendicular to the parting surface as the Z-axis. The main heat flow crossing axis refers to a virtual straight line characterizing the dominant heat flow transmission path within a non-uniform region, where the direction of any point on the line is consistent with the mainstream direction of the instantaneous heat flow vector at that point.

[0144] Furthermore, based on the physical arrangement of each unit within the target heating and cooling unit group, the projected position of each unit on the main heat flow axis is calculated. The projected position refers to the coordinates of a point obtained by projecting the geometric center coordinates of the unit onto the main heat flow axis along a direction perpendicular to the main heat flow axis. The specific calculation process is as follows: using the main heat flow axis as a reference line, a one-dimensional coordinate system is established along the axis direction. The three-dimensional geometric center coordinates of each unit are then converted into coordinate values ​​in this one-dimensional coordinate system, which is the projected position of the unit on the main heat flow axis.

[0145] Furthermore, based on the projected positions of each unit along the main heat flow path, the temperature field control device obtains the sequence of the units along the heat flow path. The heat flow path refers to the heat transfer path along the main heat flow path from the heat flow entry boundary to the heat flow exit boundary; the sequence refers to the arrangement of the units within the target heating / cooling unit group according to the order of their projected positions along the heat flow path, with units closer to the start of the heat flow path (heat flow entry side) placed first, and units closer to the end of the heat flow path (heat flow exit side) placed last. The specific sorting process is as follows: the one-dimensional coordinate values ​​corresponding to the projected positions of each unit are sorted in ascending order (the heat flow path direction is the direction of increasing one-dimensional coordinates), and the sequence of units is determined based on the sorting results.

[0146] Step 20443: Based on the sequence of actions, assign an action trigger phase to each unit in the target heating and cooling unit group in the next control cycle.

[0147] Optionally, the temperature field control device retrieves the sequence of actions and a preset control cycle duration. The control cycle duration refers to the specific time length of the preset control cycle in step 20, ranging from 0.5 seconds to 2 seconds. Based on the sequence of actions, each unit in the target heating / cooling unit group is assigned an action trigger phase in the next control cycle. The action trigger phase refers to the specific time point at which each unit initiates its corresponding action (heating or cooling) within the control cycle, represented by a time difference based on the start time of the control cycle. There is a preset phase difference between the action trigger phases of different units. The preset phase difference refers to the time interval between the initiation of actions by two adjacent units. This interval is determined based on the number of units in the target heating / cooling unit group and the control cycle duration. The specific calculation method is: preset phase difference = control cycle duration / number of units, ensuring that the action trigger phases of all units are evenly distributed throughout the entire control cycle.

[0148] Optionally, the specific allocation process in this embodiment of the invention is as follows: taking the first unit in the sequence as the starting unit, the start time (time 0) of the control period is allocated as the action trigger phase of the unit; the action trigger phases are allocated to the subsequent units in the sequence, and the trigger phase of each subsequent unit = the trigger phase of the previous unit + the preset phase difference; when the trigger phase of the last unit plus the action duration does not exceed the duration of the control period, the phase allocation is completed; if it exceeds, the size of the preset phase difference is adjusted appropriately to ensure that the actions of all units are completed within the control period.

[0149] Step 20444: Based on each unit after the action trigger phase, and in combination with the physical duration characteristics of the heating or cooling action, generate a heat flow path guiding instruction.

[0150] Optionally, the temperature field control device retrieves either the first initial guidance signal or the second initial guidance signal, extracts the action type (cooling action or heating action) and the corresponding target heating / cooling unit group identifier contained in the signal; simultaneously, it retrieves the action trigger phase of each unit within the target heating / cooling unit group. The action trigger phase refers to the specific time point at which each unit initiates its corresponding action within the control cycle, represented by a time difference based on the start time of the control cycle; the control cycle refers to the complete time period for the temperature field control device to complete one data acquisition, command generation, and execution feedback cycle, with a duration ranging from 0.5 seconds to 2 seconds.

[0151] Furthermore, the temperature field control device determines the duration of each unit's corresponding action by combining the physical duration characteristics of the heating or cooling actions. The physical duration characteristic refers to the minimum time required for the heating or cooling unit to complete one effective thermal action; this characteristic is determined by the unit's structural parameters and the thermal conductivity of the mold material. The specific process for determining the duration of the heating action is as follows: based on the rated power of the heating unit, the heat dissipation rate of the non-uniform region, and the heat replenishment requirements, the time required to achieve the preset heat replenishment effect is calculated. The preset heat replenishment effect refers to the heat flow input intensity increasing to a level matching the heat flow output intensity, with a duration ranging from 0.2 seconds to 0.8 seconds. Similarly, the specific process for determining the duration of the cooling action is as follows: based on the cooling medium flow rate, cooling medium temperature, and the amount of heat accumulation in the non-uniform region, the time required to achieve the preset heat dissipation effect is calculated. The preset heat dissipation effect refers to the heat flow output intensity increasing to a level matching the heat flow input intensity, with a duration ranging from 0.2 seconds to 0.8 seconds, consistent with the heating action.

[0152] Furthermore, the temperature field control device integrates the action information of each unit to form unit-level instruction fragments. Each unit-level instruction fragment contains four core pieces of information: a unique unit identifier, an action type, an action trigger phase, and an action duration. The unique unit identifier is used to accurately locate the corresponding heating or cooling unit and avoid false triggering of instructions; the action type clarifies the specific operation that the unit needs to perform; and the action trigger phase and action duration clarify the timing parameters for the unit to perform the operation.

[0153] Furthermore, the temperature field control device summarizes and verifies all unit-level command fragments. The verification includes: whether there are overlaps or conflicts in the trigger phase and duration of each unit's action (i.e., whether the action time of the same unit exceeds the control cycle, or whether there is an unreasonable superposition of action sequences of different units), whether the unit identifier matches the action type (heating unit corresponds to heating action, cooling unit corresponds to cooling action), and whether the duration meets the physical duration characteristics requirements. If conflicts or mismatches are found during verification, the temperature field control device readjusts the trigger phase or duration of the corresponding unit's action until all command fragments meet the requirements. After verification, the temperature field control device integrates and encodes all unit-level command fragments according to a preset command format to generate heat flow path guidance commands. The preset command format is the standard communication format between the temperature field control system and the heating and cooling units, including four parts: command header, target unit group identifier, unit-level command sequence, and command tail. The command header is used to initiate the communication connection, the target unit group identifier is used to locate the overall control object, the unit-level command sequence is the summarized unit-level command fragments, and the command tail is used to confirm the complete transmission of the command. The generated heat flow path guidance command is sent to the corresponding target heating and cooling unit group through the communication module of the temperature field control system, ensuring that each unit performs actions in coordination according to the preset action type, trigger phase and duration, and guides the heat flow to migrate in a directional manner along the specified path.

[0154] The heat flow path guidance command generated in this embodiment of the invention can drive the heating and cooling units to work together along the heat flow path, effectively enhance or guide the heat flow, accelerate the balanced distribution of heat in non-uniform areas, and realize high-precision perception and dynamic collaborative control of the temperature field of the entire injection mold.

[0155] Furthermore, the injection mold temperature field control device based on multi-sensor fusion provided by the present invention will be described below. The injection mold temperature field control device based on multi-sensor fusion described below can be referred to in correspondence with the injection mold temperature field control method based on multi-sensor fusion described above.

[0156] Reference Figure 2 , Figure 2 This is a schematic diagram of the injection mold temperature field control device based on multi-sensor fusion provided by the present invention. The injection mold temperature field control device based on multi-sensor fusion includes: The region identification module 210 is used to identify non-uniform regions with abnormal temperature gradients in the mold temperature field based on surface radiation temperature distribution images, discrete point temperature data, instantaneous heat flow direction and heat flow intensity information. The guidance instruction generation module 220 is used to construct a spatial mapping relationship based on each non-uniform region and its adjacent heating and cooling units, and to generate a heat flow path guidance instruction for each non-uniform region based on the spatial mapping relationship, instantaneous heat flow direction and heat flow intensity information; the heat flow path guidance instruction is used to instruct the corresponding heating and cooling unit to perform heating or cooling actions in the next control cycle in a directional timing sequence. The instruction triggering module 230 is used to trigger the corresponding heating and cooling unit to perform alternating heating and cooling operations according to a preset phase difference based on the heat flow path, so that the heat flow can migrate directionally in a non-uniform region along a specified path; The temperature field control module 240 is used to monitor the dynamic thermal equilibrium state formed inside the mold based on the heat flow after directional migration. When the temperature gradient change trend of each non-uniform region tends to become uniform, it enters the steady-state maintenance mode.

[0157] The embodiments of the present invention effectively eliminate the problem of temperature field control lag and inaccuracy caused by insufficient local sensing, and solve the problem of temperature gradient blind zone and product defects caused by the inability of single-point temperature measurement to fully perceive the temperature distribution of the entire mold. It realizes high-precision sensing and dynamic collaborative control of the temperature field of the entire injection mold.

[0158] Please see Figure 3 , Figure 3 An embodiment diagram of an electronic device provided in accordance with the present invention. For example... Figure 3 As shown, an embodiment of the present invention provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor 320. When the processor 320 executes the computer program 311, it implements the processes of steps 10 to 40.

[0159] Please see Figure 4 , Figure 4 An embodiment diagram of a computer-readable storage medium provided in accordance with an embodiment of the present invention is shown. Figure 4 As shown, this embodiment provides a computer-readable storage medium 400 on which a computer program 311 is stored. When the computer program 311 is executed by a processor, it implements the processes of steps 10 to 40.

[0160] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the injection mold temperature field control method based on multi-sensor fusion provided by the above methods, which includes the process of steps 10 to 40.

[0161] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-sensor fusion based injection mold temperature field regulation method, characterized in that, The infrared thermal imaging sensor, the fiber Bragg grating temperature sensor, and the heat flux density sensor are arranged in multiple asymmetrically distributed embedded mounting positions of an injection mold respectively; the infrared thermal imaging sensor is used to acquire a surface radiation temperature distribution image of the mold, the fiber Bragg grating temperature sensor is used to acquire discrete point temperature data of multiple depth layers inside the mold, and the heat flux density sensor is used to acquire instantaneous heat flow direction and heat flow intensity information of each region of the mold; the method comprises: Based on the surface radiation temperature distribution image, the discrete point temperature data, the instantaneous heat flow direction, and the heat flow intensity information, a non-uniformity region with temperature gradient abnormality in the mold temperature field is identified; Based on each non-uniformity region and the heating and cooling units adjacent to the non-uniformity region, a spatial mapping relationship is constructed, and based on the spatial mapping relationship, the instantaneous heat flow direction, and the heat flow intensity information, a heat flow path guiding instruction for each non-uniformity region is generated; the heat flow path guiding instruction is used to indicate the directionality and timing of the heating and cooling action of the corresponding heating and cooling unit in the next control cycle; Based on the heat flow path guiding instruction, the corresponding heating and cooling unit is triggered to perform alternating heating and cooling operation according to a preset phase difference, so that the heat flow migrates directionally in the non-uniformity region along a specified path; When the temperature gradient change trend of each non-uniformity region tends to be uniformized based on the dynamic heat balance state formed by the directionally migrated heat flow inside the mold, a steady state maintenance mode is entered.

2. The multi-sensor fusion based injection mold temperature field regulation method of claim 1, wherein, The step of generating the heat flow path guiding instruction for each non-uniformity region comprises: Based on the installation orientation of the heating and cooling unit associated with each non-uniformity region in the spatial mapping relationship in the mold physical structure and the spatial relative position of the non-uniformity region boundary, the local influence direction of each heating and cooling unit on the non-uniformity region is determined; Based on the vector pointing information of the instantaneous heat flow direction at each position inside the non-uniformity region, a main heat flow crossing axis through the non-uniformity region is obtained; Based on the coordinate positions of the start point and the end point of the main heat flow crossing axis on the non-uniformity region boundary, the heat flow entering side boundary segment and the heat flow leaving side boundary segment are identified; Based on the local influence direction, the heat flow entering side boundary segment, and the heat flow leaving side boundary segment, the heat flow path guiding instruction is generated.

3. The multi-sensor fusion based injection mold temperature field regulation method of claim 2, wherein, The step of generating the heat flow path guiding instruction based on the local influence direction, the heat flow entering side boundary segment, and the heat flow leaving side boundary segment comprises: Based on the unit area heat flow rate value at the heat flow entering side boundary segment in the heat flow intensity information, the heat flow input intensity level is determined, and based on the unit area heat flow rate value at the heat flow leaving side boundary segment in the heat flow intensity information, the heat flow output intensity level is determined; Based on the difference between the heat flow input intensity level and the heat flow output intensity level, it is judged whether the current heat flow is in a net accumulation state or a net dissipation state in the non-uniformity region, and a state result is obtained; a group of the heat flow inlet regulating units located at the heat flow entering side and having the local influence direction pointing to the inside of the non-uniformity region, and a group of the heat flow outlet regulating units located at the heat flow leaving side and having the local influence direction pointing away from the inside of the non-uniformity region, based on the direction consistency comparison between the local influence direction and the spatial position of the heat flow entering side boundary segment and the heat flow leaving side boundary segment; generating the heat flow path guiding instruction based on the state result, the group of the heat flow inlet regulating units and the group of the heat flow outlet regulating units.

4. The multi-sensor fusion based injection mold temperature field regulation method of claim 3, wherein, The generating the heat flow path guiding instruction based on the state result, the group of the heat flow inlet regulating units and the group of the heat flow outlet regulating units comprises: generating a first initial guiding signal for the group of the heat flow outlet regulating units to perform a cooling action based on the state result in the net accumulation state, and generating a second initial guiding signal for the group of the heat flow inlet regulating units to perform a heating action based on the state result in the net dissipation state; obtaining a sequence of the order of each unit along the heat flow path based on the target heating and cooling unit group corresponding to the first initial guiding signal and the second initial guiding signal, and the projection position of each unit in the target heating and cooling unit group along the main heat flow crossing axis in the physical arrangement sequence in the mold structure; allocating an action trigger phase in the next regulation period for each unit in the target heating and cooling unit group based on the sequence of the order; generating the heat flow path guiding instruction based on each unit after the action trigger phase and the physical duration characteristics of the heating action or the cooling action.

5. The multi-sensor fusion based injection mold temperature field regulation method according to any one of claims 1 to 4, characterized in that, The step process of identifying the non-uniformity region with the temperature gradient abnormality in the mold temperature field comprises: obtaining the spatial continuity of the local temperature change based on the temperature value difference characteristics of the adjacent pixel points in the spatial position in the surface radiation temperature distribution image, and identifying a closed region surrounded by the temperature value mutation boundary in the surface radiation temperature distribution image based on the spatial continuity; obtaining the local temperature gradient vector between each temperature measurement point and its nearest neighbor temperature measurement point based on the three-dimensional coordinate position of each temperature measurement point in the mold entity structure and the corresponding measured temperature value in the discrete point temperature data, and identifying a temperature measurement point cluster with a direction deflection of the temperature gradient greater than a preset deflection threshold in the mold internal space based on the direction consistency and the amplitude mutation characteristics of the local temperature gradient vector; identifying the non-uniformity region based on the instantaneous heat flow direction, the heat flow intensity information, the closed region and the temperature measurement point cluster.

6. The multi-sensor fusion based injection mold temperature field regulation method of claim 5, wherein, The identifying the non-uniformity region based on the instantaneous heat flow direction, the heat flow intensity information, the closed region and the temperature measurement point cluster comprises: generating a first initial guiding signal for the group of the heat flow outlet regulating units to perform a cooling action based on the state result in the net accumulation state, and generating a second initial guiding signal for the group of the heat flow inlet regulating units to perform a heating action based on the state result in the net dissipation state; Based on the physical pointing information of the instantaneous heat flow direction at each position on the mold surface and inside, the actual trajectory of the heat flow line in space is obtained, and based on the actual trajectory and the spatial overlapping relationship of the closed area, a cross section set of the heat flow line crossing the boundary of the closed area is screened out; Based on the measured values of the unit area heat flow rate at each position in the heat flow intensity information, a distribution density map of the heat flow intensity in the mold space is obtained, and based on the distribution density map and the spatial coincidence degree of the temperature point cluster, a target area with extreme heat flow intensity in the temperature point cluster area is determined; Based on the cross section set combined with the temperature value difference between the inside and outside of the closed area connected at both ends of the cross section, the temperature asymmetry index of the inlet side and the outlet side of each closed area in the heat flow crossing direction is obtained, and the closed area with a temperature asymmetry index greater than a preset threshold is determined as a candidate non-uniformity area; Based on the geometric inclusion relationship of the target area and the candidate non-uniformity area in three-dimensional space, the non-uniformity area is identified.

7. The multi-sensor fusion based injection mold temperature field regulation method of claim 6, wherein, The non-uniformity area is identified based on the geometric inclusion relationship of the target area and the candidate non-uniformity area in three-dimensional space, comprising: Based on the geometric inclusion relationship of the target area and the candidate non-uniformity area in three-dimensional space, an initial spatial region subset satisfying the temperature asymmetry and heat flow intensity abnormal conditions is obtained, and based on the actual occupied volume of the initial spatial region subset in the mold entity structure, regions with a volume less than a minimum controllable unit volume are excluded to obtain a target spatial region subset; Based on the target spatial region subset combined with the pixel connectivity feature of its boundary contour in the surface radiation temperature distribution image, the closed contour line of each target space region projected on the mold surface is obtained; Based on the region corresponding to the spatial arrangement feature that there are two or more local temperature maximum points in the internal pixel temperature distribution enclosed by the closed contour line, a multi-temperature peak region is determined, and based on the region corresponding to the structural feature that there is a continuous temperature platform segment interrupted by a non-continuous jump in the internal pixel temperature distribution enclosed by the closed contour line, a temperature fracture region is determined; The region corresponding to the physical property that the local temperature gradient vector in the multi-temperature peak region presents directional divergence, and the region corresponding to the physical property that the local temperature gradient vector in the temperature fracture region presents directional mutation or amplitude jump, are determined as the non-uniformity area.

8. A multi-sensor fusion based injection mold temperature field regulation device, characterized in that, It is applied to the injection mold temperature field regulation method based on multi-sensor fusion as claimed in any one of claims 1 to 7; an infrared thermal imaging sensor, a fiber Bragg grating temperature sensor and a heat flux density sensor are arranged at a plurality of asymmetrically distributed embedded installation positions of the injection mold; the infrared thermal imaging sensor is used to acquire a surface radiation temperature distribution image of the mold, the fiber Bragg grating temperature sensor is used to acquire discrete point temperature data of a plurality of depth layers inside the mold, and the heat flux density sensor is used to acquire instantaneous heat flow direction and heat flow intensity information of each area of the mold; the device comprises: The area recognition module is configured to recognize a non-uniform area with abnormal temperature gradient in the mold temperature field based on the surface radiation temperature distribution image, the discrete point temperature data, the instantaneous heat flow direction, and the heat flow intensity information. The guide instruction generation module is configured to construct a spatial mapping relationship based on each non-uniform area and a heating and cooling unit adjacent to the non-uniform area, and generate a heat flow path guide instruction for each non-uniform area based on the spatial mapping relationship, the instantaneous heat flow direction, and the heat flow intensity information. The heat flow path guide instruction is used to indicate a directional timing of a heating or cooling action of the corresponding heating and cooling unit in a next control period. The instruction triggering module is configured to trigger the corresponding heating and cooling unit to perform an alternating heating and cooling operation according to a preset phase difference based on the heat flow path guide instruction, so that the heat flow is directed to migrate in the non-uniform area along a specified path. The temperature field control module is configured to enter a steady-state maintenance mode when a temperature gradient change trend of each non-uniform area tends to be uniformized based on a dynamic heat balance state formed by the heat flow after the directed migration in the mold.

9. An electronic device comprising: The memory is configured to store a computer software program. The processor is configured to read and execute the computer software program. When the processor executes the computer software program, the processor implements the injection mold temperature field control method based on multi-sensor fusion according to any one of claims 1 to 7.

10. A non-transitory computer readable storage medium having stored therein a computer software program, characterized in that, When the computer software program is executed by the processor, the injection mold temperature field control method based on multi-sensor fusion according to any one of claims 1 to 7 is implemented.

Images