Production device and production method of high-thermal-conductivity C-grade glass fabric laminated product

Abstract

The invention relates to the technical field of glass fabric processing, in particular to a production device and a production method of a high-thermal-conductivity C-grade glass fabric laminated product, the production device comprises a hot press body, the hot press body is provided with an upper die, a lower die and a plurality of middle pressing plates, the lower die is provided with a plurality of independent supporting units, and the middle pressing plates are arranged on the lower die. Each supporting unit comprises a lifting plate, a temperature sensor is fixedly arranged at the bottom of each lifting plate, a piezoelectric sensor is arranged at the bottom end of each temperature sensor, a main hydraulic cylinder is arranged at the bottom of the hot press body, and the main hydraulic cylinders are fixedly connected with the lower die. Through cooperation of the electric telescopic rod, the temperature sensor, the piezoelectric sensor and the lifting plate, whether a pressed product is warped or not, the warping reason and the warping position are immediately detected according to whether the pressed product forms counter-acting force on the lifting plate or not after demolding, and the technical effect of rapidly detecting whether the pressed product has the warping defect or not is achieved.

Description

Technical Field

[0001] This invention relates to the field of fiberglass cloth processing technology, and in particular to a production apparatus and method for producing high thermal conductivity C-grade fiberglass cloth laminated products. Background Technology

[0002] High thermal conductivity Class C glass fiber cloth pressed products are composite material products made of special high thermal conductivity Class C glass fiber cloth as the base material through hot pressing molding process. Its core characteristic is that it has excellent thermal conductivity performance and is suitable for scenarios that require efficient heat dissipation, such as electronic equipment, new energy batteries or aerospace components.

[0003] This product is mainly made by a glass fiber hot press molding machine, a special equipment that uses high temperature (usually 0-300℃) and high pressure (100-800 tons) to solidify the pre-impregnated glass fiber cloth and resin matrix in a mold, thereby obtaining a product with high strength, lightweight and excellent thermal conductivity.

[0004] High thermal conductivity Class C fiberglass cloth laminates are prone to warping defects during hot pressing due to the sensitivity of the matrix resin to shrinkage and the uneven distribution of the fiberglass reinforcement phase. Existing technologies present the following problems that urgently need to be addressed: Traditional multi-layer hot pressing equipment, while possessing pressing capabilities, can only perform simple pressing operations according to pre-set pressure and temperature values ​​during the hot pressing process. It lacks an online detection mechanism, and warping defects must rely on subsequent processes or offline manual inspection. This results in low inspection efficiency, large errors, and a lag in defect detection, leading to defective products flowing into the next process, increasing rework costs and production losses. Furthermore, the differences in stress and temperature distribution in different areas during hot pressing cannot be perceived in real time, making it easy for local warping to occur due to variations in blank thickness, fiber accumulation, and uneven cooling. Moreover, the causes of defects cannot be traced, leading to the recurrence of similar defects.

[0005] Traditional warpage detection methods lack an efficient static preliminary screening process after demolding, resulting in long detection cycles, low efficiency, and high production and maintenance costs. Furthermore, they cannot achieve precise linkage between the lower mold movement and the electric telescopic rod action, making it difficult to use the telescopic rod extension to stably contact the product and maintain tight contact constraint between the bottom pressure plate and the bottom middle pressure plate. They can only rely on the single telescopic rod retraction action to collect dynamic data, failing to capture the warpage dynamic response characteristics of the product throughout the entire process of "contact constraint → gradual release". This leads to a high rate of missed detection for minor warpage defects. At the same time, the lack of force-temperature-stroke linkage data makes it difficult to accurately distinguish the causes of warpage defects, and there is no reliable basis for process optimization. Summary of the Invention

[0006] The purpose of this invention is to provide a production apparatus and method for high thermal conductivity C-grade fiberglass cloth laminate products, which solves the technical problems of low efficiency and insufficient accuracy in detecting warping defects in the hot pressing production of high thermal conductivity C-grade fiberglass cloth laminate products, as well as the inability to determine the cause of warping in the pressed products.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A production apparatus for high thermal conductivity Class C fiberglass cloth laminated products includes a hot press body. The hot press body is provided with an upper mold, a lower mold, and multiple intermediate pressure plates. The lower mold is provided with multiple independent support units. Each support unit includes a lifting plate. A temperature sensor is fixedly installed at the bottom of each lifting plate. A piezoelectric sensor is installed at the bottom of the temperature sensor. The piezoelectric sensor is used to detect the reaction force of the laminated product on the support unit. The temperature sensor is used to detect the temperature of the top surface area of ​​the support unit. A main hydraulic cylinder is provided at the bottom of the hot press body. The main hydraulic cylinder is fixedly connected to the lower mold and is used to drive the lower mold to move upward as a whole to apply the main pressing pressure.

[0008] Preferably, the lower mold has multiple mounting cavities corresponding to the support unit, and the temperature sensor and the piezoelectric sensor are both located in the corresponding mounting cavities.

[0009] Preferably, each of the support units includes an electric telescopic rod fixed to the bottom side wall of the mounting cavity. The top of the electric telescopic rod is fixedly connected to a piezoelectric sensor. The electric telescopic rod is configured to independently drive the support units to extend upward synchronously after the main hydraulic cylinder drives the overall mold to descend and release the main pressing pressure, so that each support unit extends upward synchronously at a speed of 0.1 to 1.0 mm / s, and the retraction stroke is 0.2 to 3.0 mm.

[0010] Preferably, the hot press body is equipped with a control system and a hydraulic system. The main hydraulic cylinder is connected to the hydraulic system through connecting pipelines. The hydraulic system, the main hydraulic cylinder, the piezoelectric sensor, the temperature sensor, and the electric telescopic rod are all electrically connected to the control system. The system is configured to synchronously collect the reaction force and temperature data of each support unit. Based on the force-temperature coupling characteristics of the reaction force difference, temperature difference, and the changing trend of the two of each support unit, the system can determine the local warping, overall warping, and warping area location of the laminated product. After demolding, the initial warping screening can be completed through the sensor data corresponding to each lifting plate, which greatly shortens the detection cycle, increases the production efficiency of a single batch by 20%, and reduces production and maintenance costs.

[0011] Preferably, the feeding end of the hot press body is fixedly connected to a lifting platform by bolts for transferring the products to be pressed and the pressed products.

[0012] A method for producing a high thermal conductivity C-grade fiberglass cloth laminate includes the following steps: S1. After hot pressing and curing are completed, the control system drives the main hydraulic cylinder to lower the lower mold as a whole, releasing the main pressing pressure; S101. Control the lower mold to move to a micro-gap position 0.1 to 0.5 mm away from the upper surface of the laminated product and hold it for 3 to 10 seconds. The lower mold radiates heat to form a flexible constraint on the upper surface of the product, so that the potential warping area generates an enhanced reaction force of the lower mold under the restricted springback state. S2. Collect the initial reaction force and surface temperature of each support unit under the micro-gap constraint state, and determine whether there are areas with low force values ​​and abnormal temperatures; S3. Control the start of the electric telescopic rod to make each support unit retract upward synchronously and slowly, and monitor the dynamic changes of reaction force and temperature in real time; S4. When multiple support units simultaneously experience abnormal fluctuations in reaction force, pause the retraction action and continue demolding after the signal stabilizes. S5. Based on the coupling relationship between the reaction force distribution and the temperature distribution, determine the type of warpage and generate process feedback instructions.

[0013] Preferably, step S2 includes the following steps: S201. Calculate the average reaction force and average temperature of all the support units; S202. If the reaction force of a certain support unit is higher than 130% of the average reaction force, and the temperature difference between the support unit and the adjacent support unit exceeds 3-5°C, then the area is marked as a "constrained protrusion risk area". S203. If the reaction force is less than 70% of the average value but the temperature distribution is uniform, it is marked as a "material shrinkage and depression risk zone".

[0014] Preferably, step S3 includes the following steps: S301. Within the range of 0.2 to 1.0 mm of the retraction stroke of the support unit, the reaction force and temperature of each support unit are simultaneously recorded as a function of displacement. S302. If the force value of the "constrained protrusion risk area" marked in S2 drops rapidly in the initial stage of retraction, it is confirmed that there is an upward warping defect in the area; S303. If the temperature of the support unit corresponding to the geometric center of the product is low, and the force value attenuation in this area is less than 10% during the shrinkage process, it is considered slow attenuation, and it is determined to be a central shrinkage bulge.

[0015] Preferably, step S4 includes the following steps: S401. When three or more adjacent support units simultaneously experience a sudden drop or rise in reaction force (fluctuation amplitude exceeding ±5N), the control system shuts down the actuator of the electric telescopic rod. S402. Pause the retraction for 5-10 seconds to allow the internal stress of the product to release naturally. S403. Restart the electric telescopic rod to complete the remaining portion of the total retraction stroke of 0.2 to 3.0 mm at a low speed of 0.2 mm / s.

[0016] Preferably, step S5 includes the following steps: S501. Warping defects are classified into three categories: Material shrinkage type: abnormal reaction force but uniform temperature distribution (maximum temperature difference ≤2℃); Uneven cooling type: abnormal reaction force accompanied by significant temperature gradient (temperature difference between adjacent support units ≥ 3℃); Potentially delayed type: The reaction force is normal, but the temperature is extremely uneven (maximum temperature difference ≥8℃); S502. For material shrinkage defects, send a raw material batch traceability alarm to the control system; S503. To address the uneven cooling defect, send cooling parameter optimization suggestions (such as adjusting the cooling airflow or extending the cooling time) to the hot press control system. S504. For potential delayed defects, automatically mark the product and place it in an isolated inspection area, and record the temperature difference data for subsequent analysis; S505. When producing new specifications of products for the first time, a standard force-temperature joint benchmark database shall be established based on manually confirmed good product samples (collecting force-temperature data of 100 sets of good products in the initial state of S2 and the retraction process of S3). Subsequent tests shall be based on this database for comparison and judgment.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. By integrating piezoelectric sensors and temperature sensors, and dividing the top of the lower mold into multiple lifting plates, combined with a control system, force-temperature data for each lifting plate area during hot pressing and demolding stages can be collected independently. When the pressed product warps, the warped area generates a reaction force on the lifting plate, thereby determining whether the pressed product is qualified, whether warping has occurred, and the location of the warping. This can accurately identify abnormal forces and temperatures in each zone. At the same time, a micro-gap is maintained between the top of the pressed product on the lower mold and the intermediate pressure plate closest to the lower mold. When warping occurs, the warped area generates a reaction force on the intermediate pressure plate, and the bottom of the warped sides of the pressed product squeezes the piezoelectric sensors corresponding to the lifting plates, determining whether the pressed product has warped and the location of the warping. This significantly shortens the detection cycle and reduces production and maintenance costs.

[0018] 2. By using an electric telescopic rod to contact the object for a certain period of time before retracting, the dynamic detection process of "extension contact → retraction release" can quickly filter out obvious defects through static screening and capture the full-process response characteristics of warping through dynamic detection. This solves the core pain point of "high efficiency but insufficient accuracy". By "synchronous linkage between the lower mold movement and the extension of the telescopic rod", a stable contact constraint is actively established. Then, the full-cycle dynamic detection of "constraint → release" is achieved through retraction. This can amplify the force-temperature change signal of slight warping and achieve "dual optimization of efficiency and accuracy". Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the overall structure from another perspective of the present invention.

[0022] Figure 3 This is a schematic diagram of the extended state of the electric telescopic rod of the present invention.

[0023] Figure 4 This is a schematic diagram of the support unit in this invention.

[0024] Figure 5 This is a schematic diagram of the distribution structure of the mounting cavity in this invention.

[0025] Figure 6 This is a schematic diagram showing the distribution of the electric telescopic rod and temperature sensor of the present invention.

[0026] In the diagram: 1. Upper mold; 2. Lower mold; 201. Support unit; 202. Piezoelectric sensor; 203. Mounting cavity; 204. Temperature sensor; 205. Lifting plate; 3. Main hydraulic cylinder; 4. Electric telescopic rod; 6. Intermediate pressure plate; 7. Hot press body; 8. Lifting platform; 9. Control system. Detailed Implementation

[0027] 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. Example 1

[0028] High thermal conductivity Class C fiberglass cloth laminates are prone to warping defects during hot pressing due to the sensitivity of the matrix resin to shrinkage and the uneven distribution of the fiberglass reinforcement phase. Existing technologies present the following problems that urgently need to be addressed: Traditional multi-layer hot pressing equipment, while possessing pressing capabilities, can only perform simple pressing operations according to pre-set pressure and temperature values ​​during the hot pressing process. It lacks an online detection mechanism, and warping defects must rely on subsequent processes or offline manual inspection. This results in low inspection efficiency, large errors, and a lag in defect detection, leading to defective products flowing into the next process, increasing rework costs and production losses. Furthermore, the differences in stress and temperature distribution in different areas during hot pressing cannot be perceived in real time, making it easy for local warping to occur due to variations in blank thickness, fiber accumulation, and uneven cooling. Moreover, the causes of defects cannot be traced, leading to the recurrence of similar defects.

[0029] To resolve the above technical issues, please refer to Figures 1 to 6As shown, the first embodiment of the present invention provides a production apparatus for high thermal conductivity C-grade fiberglass cloth laminated products, including a hot press body 7. The hot press body 7 is provided with an upper mold 1, a lower mold 2, and a plurality of intermediate pressure plates 6. The intermediate pressure plates 6 are slidably connected to the hot press body 7, and the movement of the intermediate pressure plates 6 can be achieved using existing technology. The upper mold 1 is fixedly connected to the hot press body 7, and the lower mold 2 is slidably connected to the hot press body 7. The lower mold 2 is provided with a plurality of independent support units 201, each of which includes a lifting plate 205. A temperature sensor 204 is fixedly installed at the bottom of the 05, and a piezoelectric sensor 202 is installed at the bottom end of the temperature sensor 204. The piezoelectric sensor 202 is used to detect the reaction force of the laminated product on the support unit 201. The temperature sensor 204 is used to detect the temperature of the top surface area of ​​the support unit 201. A main hydraulic cylinder 3 is installed at the bottom of the hot press body 7. The main hydraulic cylinder 3 is fixedly connected to the lower mold 2 and is used to drive the lower mold 2 to move upward as a whole to apply the main pressing pressure. The lower mold 2 has multiple mounting cavities 203 corresponding to the support unit 201. The temperature sensor 204 and the piezoelectric sensor 202 are both located in the corresponding mounting cavities 203. The hot press body 7 is equipped with a control system 9 and a hydraulic system 10. The main hydraulic cylinder 3 is connected to the hydraulic system 10 via connecting pipes. The hydraulic system 10, the main hydraulic cylinder 3, the piezoelectric sensor 202, and the temperature sensor 204 are all electrically connected to the control system 9. They are configured to synchronously collect the reaction force and temperature data of each support unit 201, and to perform force-temperature coupling based on the difference in reaction force, the difference in temperature, and the trend of their changes in each support unit 201. The system features the ability to identify local warping, overall warping, and the location of warped areas in laminated products. After demolding, preliminary warping screening can be completed using sensor data corresponding to each lifting plate 205, significantly shortening the detection cycle, increasing single-batch production efficiency by 20%, and reducing production and maintenance costs. The hot press body 7 has a lifting platform 8 fixedly connected to the feeding end by bolts for transferring products to be pressed and products to be pressed. In this solution, the intermediate pressure plate 6, upper mold 1, and lower mold 2 all integrate heating, heat dissipation, and sealing functions. The implementation of heating, heat dissipation, and sealing functions adopts existing technology and will not be described in detail here.

[0030] When in use, the equipment is turned on. After the control system 9 receives the start command, it first sends an action signal to the hydraulic system. The hydraulic system drives the main hydraulic cylinder 3, which is fixedly connected to the bottom of the lower mold 2, to start. The main hydraulic cylinder 3 extends upward at a constant speed, driving the lower mold 2 to move upward synchronously. During the upward movement of the lower mold 2, it pushes the intermediate pressure plate 6 stacked on it and the high thermal conductivity C-grade glass fiber cloth laminate blank to be pressed to rise synchronously until the uppermost intermediate pressure plate 6 is in close contact with the lower surface of the upper mold 1 fixed at the top of the hot press body 7.

[0031] At this time, the temperature sensor 204 has started to detect the temperature data of each area of ​​the support surface of the lower mold 2 in real time, and the piezoelectric sensor 202 synchronously collects the initial reaction force data of each area. All detection data are transmitted to the control system 9 in real time through the signal line. The control system 9 performs preliminary analysis on the data to determine whether the current temperature distribution meets the requirements of the hot pressing process and ensures that the billet is in a uniform temperature environment.

[0032] The main hydraulic cylinder 3 continuously applies upward force. Since the upper mold 1 is fixed, the upward force of the lower mold 2 is converted into a pressing force on the multi-layer blanks. The pressing force is evenly transmitted to each layer of blanks through the lower mold 2 and the intermediate pressure plate 6. The upper mold 1, the lower mold 2 and the intermediate pressure plate 6 are all equipped with heating systems. The blanks are hot-pressed and solidified under the combined action of pressure and the heating systems built into the upper mold 1, the lower mold 2 and the intermediate pressure plate 6.

[0033] During the curing process, the control system 9 continuously receives reaction force data from the piezoelectric sensor 202 and temperature data from the temperature sensor 204, and monitors the pressure distribution and temperature changes in each area in real time. If an abnormal reaction force or temperature deviation in a certain area is detected to exceed a preset threshold, the control system 9 will immediately adjust the pressure parameters of the hydraulic system or the temperature parameters of the heating system to ensure that the blank is subjected to uniform force and heat during the curing process, and to avoid warping defects caused by abnormal local parameters. The pressure parameters of the hydraulic system, the temperature parameters of the heating system, as well as the heat dissipation system and sealing of the hot press body 7 all adopt existing technologies, which will not be described in detail here.

[0034] After the blank is hot-pressed and cured, the control system 9 sends a pressure relief command to the hydraulic system according to the preset process sequence. The hydraulic system gradually reduces the oil pressure in the main hydraulic cylinder 3, and the pressing force applied by the main hydraulic cylinder 3 slowly decreases to zero. Then, the control system 9 controls the main hydraulic cylinder 3 to retract downward at a uniform speed, driving the lower mold 2 to move downward synchronously. The lower mold 2 gradually separates from the intermediate pressure plate 6 and the cured laminated product, realizing demolding and release. At the same time, a small distance is maintained between the top of the pressed product on the lower mold 2 and the bottom of the nearest intermediate pressure plate 6.

[0035] After demolding is completed, the control system 9 immediately initiates the warpage detection process. The upper mold 1 remains fixed, while the main hydraulic cylinder 3 drives the pressed product on the lower mold 2 to maintain a small distance from the bottom of the nearest intermediate pressure plate 6. This distance is not affected by the force of the intermediate pressure plate 6, but when warpage occurs, it allows the warped part to contact the bottom of the intermediate pressure plate 6. The preset micro-gap position is maintained for 3 to 10 seconds, causing the potential warped area of ​​the product to generate a significant change in reaction force under restricted springback. Thus, when the pressed product warps, the warped position of the pressed product contacts the top of the intermediate pressure plate 6. After the pressed product warps, the pressure of the warped position on the bottom lifting plate 205 enhances the accuracy of the piezoelectric sensor 202 in detecting warpage, and determines the location of warpage based on the position of the lifting plate 205.

[0036] During this process, the support unit 201 on the lower mold 2 synchronously supports the product, the piezoelectric sensor 202 accurately detects the reaction force data of the laminated product in each support unit 201 area on the support surface of the lower mold 2, and the temperature sensor 204 synchronously collects the real-time temperature data of each support unit 201 area. The two types of data are synchronously received and stored by the control system 9. The control system 9 first calculates the average reaction force and average temperature of all support unit 201 detection points, and uses this as the benchmark data for comparison and analysis.

[0037] If the reaction force detected by the piezoelectric sensor 202 in a certain support unit 201 area is higher than 130% of the average reaction force, and the temperature detected by the temperature sensor 204 in that area is more than 3-5℃ different from the temperature difference in the adjacent support unit 201 area, the control system 9 will automatically mark that area as a "constrained protrusion risk area". If the reaction force in a certain support unit 201 area is lower than 70% of the average value, but the temperature detected by the temperature sensor 204 is uniform, it will be marked as a "material shrinkage depression risk area". The temperature difference and reaction force threshold at this location are recorded after a large number of good products are produced, and this data is stored in the control system 9 to determine whether the temperature and reaction force during the pressurization process are normal.

[0038] Subsequently, the control system 9 continuously receives dynamic data from the two types of sensors, monitoring the changing trends of reaction force and temperature over time. If the piezoelectric sensor 202 detects abnormal fluctuations such as a sudden drop or rise in reaction force in multiple support unit 201 areas simultaneously, the sudden drop in reaction force is caused by the sudden loss of force value due to the local upward bulge of the pressed product suddenly breaking free from the constraint during retraction. In other words, the pressed product will warp upward, such as bulging or curling. The control system 9 will immediately control the main hydraulic cylinder 3 to remain stationary to prevent the lower mold 2 from moving and aggravating the stress concentration of the pressed product. After the sensor detects that the data is stable, the control system 9 will then control the main hydraulic cylinder 3 to drive the lower mold 2 to continue to move slightly to complete the subsequent demolding action.

[0039] Throughout the detection process, the control system 9 compares all the data collected by the piezoelectric sensor 202 and the temperature sensor 204 with the preset standard force-temperature joint reference database. Combining the coupling relationship between the reaction force distribution and the temperature distribution, it accurately identifies the type of warping defect, including material shrinkage type with abnormal reaction force but uniform temperature, cooling uneven type with abnormal reaction force and accompanied by a significant temperature gradient, and potential delay type with normal reaction force but extremely uneven temperature.

[0040] For different types of defects, the control system 9 will automatically generate corresponding process feedback instructions and record all detection data, defect types and processing instructions. This provides complete data support for subsequent production process optimization, raw material traceability and product quality control. After the inspection is completed, the main hydraulic cylinder 3 drives the lower mold 2 to move to the initial lowest position. The main hydraulic cylinder 3 stops moving, and the lifting platform 8 at the feeding end of the hot press body 7 starts to transfer the inspected laminated product out of the mold area, completing the entire process.

[0041] By integrating piezoelectric sensors 202 and temperature sensors 204, and dividing the top of the lower mold 2 into multiple lifting plates 205, combined with the control system 9, the force-temperature data of each lifting plate 205 corresponding area during the hot pressing and demolding stages can be collected independently. When the pressed product warps, the warped position generates a reaction force on the lifting plate 205, thereby determining whether the pressed product is qualified, whether warping has occurred, and the location of the warping. This can accurately identify the force and temperature abnormalities in each zone. At the same time, a micro-gap is maintained between the top of the pressed product on the lower mold 2 and the intermediate pressure plate 6 closest to the lower mold 2, so that when warping occurs, the warped area generates a reaction force on the intermediate pressure plate 6. Consequently, the bottom of the warped sides of the pressed product squeezes the piezoelectric sensors 202 corresponding to the lifting plates 205, determining whether the pressed product has warped and the location of the warping. This significantly shortens the detection cycle, increases the production efficiency of a single batch by 20%, and reduces production and maintenance costs. Example 2

[0042] Traditional warpage detection methods lack an efficient static preliminary screening process after demolding, resulting in long detection cycles, low efficiency, and high production and maintenance costs. Furthermore, they cannot achieve precise linkage between the downward movement of the lower mold 2 and the movement of the electric telescopic rod 4. It is difficult to use the extension of the telescopic rod to stably contact the product and maintain tight contact and constraint between the bottom pressure product and the bottom middle pressure plate 6. Dynamic data can only be collected by the single retraction action of the telescopic rod, which cannot capture the warpage dynamic response characteristics of the product in the entire process of "contact constraint → gradual release". This leads to a high rate of missed detection of minor warpage defects. At the same time, there is a lack of force-temperature-stroke linkage data support, making it difficult to accurately distinguish the causes of warpage defects. There is no reliable basis for process optimization. The movement of the main hydraulic cylinder 3 cannot be accurate to the nanometer level, and it is impossible to accurately control within a small movement distance range.

[0043] To resolve the above technical issues, please refer to the reference. Figures 1 to 6 As shown, the technical solution adopted includes support units 201, each of which includes an electric telescopic rod 4 fixed to the bottom side wall of the mounting cavity 203. In this invention, the electric telescopic rod 4 is a miniature electric telescopic rod 4. The top of the electric telescopic rod 4 is fixedly connected to the piezoelectric sensor 202. The electric telescopic rod 4 is configured to independently drive the support units 201 to extend upward synchronously after the main hydraulic cylinder 3 drives the mold 2 to descend as a whole to release the main pressing pressure, so that each support unit 201 extends upward synchronously at a speed of 0.1 to 1.0 mm / s. The retraction stroke is 0.2-3.0mm. The electric telescopic rod 4 is electrically connected to the control system 9 and is configured to synchronously collect the reaction force and temperature data of each support unit 201. Based on the force-temperature coupling characteristics of the reaction force difference, temperature difference and the changing trend of each support unit 201, the local warping, overall warping and warping area location of the laminated product can be identified. After demolding, the preliminary warping screening can be completed through the sensor data corresponding to each lifting plate 205, which greatly shortens the detection cycle, increases the production efficiency of a single batch by 20%, and reduces production and maintenance costs.

[0044] After the blank is hot-pressed and cured, the control system 9 sends a pressure relief command to the hydraulic system according to the preset process sequence. The hydraulic system gradually reduces the oil pressure in the main hydraulic cylinder 3. At the same time, when the lower mold 2 moves downward, the electric telescopic rod 4 extends and drives the lifting plate 205 to move upward through the piezoelectric sensor 202 and the temperature sensor 204. This ensures that the lifting plate 205 always keeps in contact with the lowermost pressed product and keeps the lowermost pressed product in contact with the lowermost middle pressing plate 6 without gaps or looseness.

[0045] When the pressing force applied by the main hydraulic cylinder 3 is zero and there is a certain distance between the lowest middle pressure plate 6 and the lower mold 2 (5-10mm), the control system 9 immediately controls the main hydraulic cylinder 3 to stop moving downward and keeps the lower mold 2 in a fixed position. At this time, the electric telescopic rod 4 remains in an extended and pressure-holding state for 3-10 seconds. The piezoelectric sensor 202 collects the stable reaction force data of each area in real time, and the temperature sensor 204 collects the temperature data of each area synchronously. The control system 9 calculates the average reaction force and average temperature of all support unit 201 areas as the reference data for dynamic detection.

[0046] The control system 9 controls the retraction of the electric telescopic rods 4. All electric telescopic rods 4 retract synchronously and slowly at a speed of 0.1 to 1.0 mm / s, driving the lifting plate 205 to gradually detach from the lower surface of the lowest laminated product. During the retraction process, the electric telescopic rods 4 feed back the stroke data to the control system 9 in real time. The piezoelectric sensor 202 continuously captures the dynamic changes of the reaction force in each area (including the force attenuation rate, sudden rise and fall fluctuations, etc.). The temperature sensor 204 synchronously collects the real-time temperature fluctuation data of each area. The data from the three sources form a linkage feedback and are transmitted to the control system 9 in real time for analysis and processing.

[0047] If the piezoelectric sensor 202 detects a reaction force higher than 130% of the average reaction force in a certain support unit 201 area, and the temperature difference between the temperature detected by the temperature sensor 204 in that area and the temperature difference between that area and the adjacent support unit 201 area exceeds 3-5℃, the control system 9 automatically marks that area as a "constrained protrusion risk area" and controls the electric telescopic rod 4 in the corresponding area to appropriately slow down the contraction speed (down to 0.2mm / s); if the reaction force in a certain support unit 201 area is lower than 70% of the average value, but the temperature sensor 204 detects that the temperature distribution in each area is uniform (maximum temperature difference ≤2℃), then it is marked as a "material shrinkage depression risk area", and the electric telescopic rod 4 maintains its original contraction speed.

[0048] If the control system 9 detects a sudden increase or decrease in reaction force (fluctuation amplitude exceeding ±5N) in the areas of three or more adjacent support units 201 simultaneously, it immediately sends a pause command to control all electric telescopic rods 4 to stop retracting, pause for 5 to 10 seconds to wait for the internal stress of the product to be released naturally; after the sensor data stabilizes, it restarts the electric telescopic rods 4 and continues to complete the remaining part of the total retraction stroke of 0.2 to 3.0 mm at a low speed of 0.2 mm / s.

[0049] Throughout the inspection process, the control system 9 integrates the static data from the initial screening with the force-temperature-stroke linkage data from the dynamic detection, and compares it with the preset standard force-temperature-stroke joint benchmark database to accurately determine the type of warpage defect and automatically generate process feedback instructions. After the inspection is completed, the control system 9 controls all electric telescopic rods 4 to retract to the initial fully retracted state, the main hydraulic cylinder 3 drives the lower mold 2 to reset to the initial lowest position, and the lifting platform 8 starts to transfer the inspected laminated product out of the mold area, completing the entire process.

[0050] By having the electric telescopic rod 4 retract after a certain period of contact, the dynamic detection process of "extension contact → retraction separation" can quickly filter obvious defects through static screening and capture the full-process response characteristics of warping through dynamic detection, improving the defect detection rate by more than 60%. At the same time, it balances efficiency and accuracy, solving the core pain point of "high efficiency but insufficient accuracy" in the former. By "synchronous linkage between the lower mold 2 moving down and the electric telescopic rod 4 extending", a stable contact constraint is actively established. Then, the full-cycle dynamic detection of "constraint → separation" is achieved through retraction. It can amplify the force-temperature change signal of slight warping, improving the accuracy of dynamic defect detection by more than 40%, while retaining the advantage of "20% improvement in efficiency of preliminary screening", achieving "dual optimization of efficiency and accuracy".

[0051] The connecting pipelines and hydraulic system are not shown in the figure; existing technologies can be used, and they will not be described in detail here. Example 3

[0052] Based on the above embodiments, this embodiment also provides a method for producing high thermal conductivity Class C fiberglass cloth laminate products, including the following steps: S1. After hot pressing and curing are completed, the control system 9 drives the main hydraulic cylinder 3 to lower the lower mold 2 as a whole, releasing the main pressing pressure; The high thermal conductivity C-grade fiberglass cloth laminate blank (thickness 3mm, resin content 35%, fiberglass surface density 200g / ㎡) is hot-pressed and cured by the hot press body 7. The process parameters are temperature 150℃, pressure 20MPa, and pressure holding 60s. The blank is cured and formed between the upper mold 1, lower mold 2, and the intermediate pressure plate 6 of the 5th layer.

[0053] S101. Control the movement of the lower mold 2 to make the intermediate pressure plate 6 a micro gap position of 0.1 to 0.5 mm away from the upper surface of the laminated product and maintain it for 3 to 10 seconds. The lower mold 2 radiates heat to form a flexible constraint on the upper surface of the product, so that the potential warping area generates an enhanced reaction force of the lower mold 2 under the restricted springback state. Action execution: The control system 9 synchronously controls the upper mold 1 to rise at a speed of 3 mm / s until the gap between the lower surface of the upper mold 1 and the upper surface of the laminated product is 0.3 mm (the midpoint of the micro-gap range of 0.1 to 0.5 mm), and holds this position for 5 seconds (typical holding time of 3 to 10 seconds).

[0054] Constraint principle: The upper mold 1 has a built-in cooling channel. After demolding, the surface temperature drops to 120°C. The heat dissipation through radiation forms a flexible thermal constraint on the upper surface of the product, restricting the product from irregular free rebound. At the same time, the micro-gap physical space restricts the upward warping of the product, allowing the stress in the potential warping area to be transmitted downward, enhancing the reaction force signal received by the lifting plate 205 on the lower mold 2 (the signal strength is increased by 30% compared to the unconstrained state).

[0055] Technical objective: To amplify the detection signal of warping defects and solve the problem that the signal of slight warping is weak and difficult to capture in traditional detection.

[0056] S2. Collect the initial reaction force and surface temperature of each support unit 201 under the micro-gap constraint state, and determine whether there are areas with low force values ​​and abnormal temperatures. S3. Control the start of the electric telescopic rod 4 to make each support unit 201 retract upward synchronously and slowly, and monitor the dynamic changes of reaction force and temperature in real time; S4. When multiple support units 201 simultaneously experience abnormal fluctuations in reaction force, pause the retraction action and continue demolding after the signal stabilizes. S5. Based on the coupling relationship between the reaction force distribution and the temperature distribution, determine the type of warpage and generate process feedback instructions.

[0057] Specifically, S2 includes the following steps: S201. Calculate the average reaction force and average temperature of all the support units 201; S202. If the reaction force of a certain support unit 201 is higher than 130% of the average reaction force, and the temperature difference between its temperature and that of the adjacent support unit 201 exceeds 3 to 5°C, then the area is marked as a "constrained protrusion risk area". S203. If the reaction force is less than 70% of the average value but the temperature distribution is uniform, it is marked as a "material shrinkage and depression risk zone".

[0058] Specifically, S3 includes the following steps: S301. Within the range of 0.2 to 1.0 mm of the retraction stroke of the support unit 201, the reaction force and temperature of each support unit 201 as a function of displacement are recorded simultaneously. S302. If the force value of the "constrained protrusion risk area" marked in S2 drops rapidly in the initial stage of retraction, it is confirmed that there is an upward warping defect in the area; S303. If the temperature of the support unit 201 corresponding to the geometric center of the product is low, and the force value attenuation in this area is less than 10% during the retraction process, which is considered slow attenuation, then it is determined to be a central shrinkage bulge.

[0059] Specifically, S4 includes the following steps: S401. When three or more adjacent support units 201 simultaneously experience a sudden drop or rise in reaction force (fluctuation amplitude exceeding ±5N), the control system 9 shuts down the actuator of the electric telescopic rod 4. S402. Pause the retraction for 5-10 seconds to allow the internal stress of the product to release naturally. S403. Restart the electric telescopic rod 4 to complete the remaining part of the total retraction stroke of 0.2 to 3.0 mm at a low speed of 0.2 mm / s.

[0060] Specifically, S5 includes the following steps: S501. Warping defects are classified into three categories: Material shrinkage type: abnormal reaction force but uniform temperature distribution (maximum temperature difference ≤ 2℃); Uneven cooling type: abnormal reaction force accompanied by a significant temperature gradient (temperature difference between adjacent support units 201 ≥ 3℃); Potential delay type: normal reaction force but extremely uneven temperature (maximum temperature difference ≥ 8℃). S502. For material shrinkage defects, send a raw material batch traceability alarm to the control system 9; S503. To address the uneven cooling defect, the system sends cooling parameter optimization suggestions (such as adjusting the cooling airflow and extending the cooling time) to the hot press control system 9. The cooling airflow adjustment and the extension of the cooling time are based on existing technologies and will not be described in detail here. S504. For potential delayed defects, automatically mark the product and place it in an isolated inspection area, and record the temperature difference data for subsequent analysis; S505. When producing new specifications of products for the first time, a standard force-temperature joint benchmark database shall be established based on manually confirmed good product samples. 100 sets of force-temperature data of good products in the initial state of S2 and the retraction process of S3 shall be collected. Subsequent tests shall be based on this database for comparison and judgment.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A production apparatus for high thermal conductivity C-grade fiberglass cloth laminated products, comprising a hot press body (7), characterized in that, The hot press body (7) is provided with an upper mold (1), a lower mold (2) and multiple intermediate pressure plates (6). The lower mold (2) is provided with multiple independent support units (201). Each support unit (201) includes a lifting plate (205). Each lifting plate (205) is fixedly provided with a temperature sensor (204) at its bottom. The temperature sensor (204) is provided with a piezoelectric sensor (202) at its bottom end. The piezoelectric sensor (202) is used to detect the reaction force of the laminated product on the support unit (201). The temperature sensor (204) is used to detect the temperature of the top surface area of ​​the support unit (201). The hot press body (7) is provided with a main hydraulic cylinder (3) at its bottom. The main hydraulic cylinder (3) is fixedly connected to the lower mold (2) and is used to drive the lower mold (2) to move upward as a whole and apply the main pressing pressure.

2. The production apparatus for high thermal conductivity C-grade fiberglass cloth laminated products according to claim 1, characterized in that, The lower mold (2) has multiple mounting cavities (203) corresponding to the support unit (201), and the temperature sensor (204) and the piezoelectric sensor (202) are both located in the corresponding mounting cavities (203).

3. The production apparatus for high thermal conductivity C-grade fiberglass cloth laminated products according to claim 2, characterized in that, Each of the support units (201) includes an electric telescopic rod (4) fixed to the bottom side wall of the mounting cavity (203). The top of the electric telescopic rod (4) is fixedly connected to a piezoelectric sensor (202). The electric telescopic rod (4) is configured to independently drive the support units (201) to extend upward synchronously after the main hydraulic cylinder (3) drives the lower mold (2) to descend as a whole to release the main pressing pressure, so that each support unit (201) extends upward synchronously at a speed of 0.1 to 1.0 mm / s, and the retraction stroke is 0.2 to 3.0 mm.

4. The production apparatus for high thermal conductivity C-grade fiberglass cloth laminated products according to claim 3, characterized in that, The hot press body (7) is equipped with a control system (9) and a hydraulic system (10). The main hydraulic cylinder (3) is connected to the hydraulic system (10) through a connecting pipeline. The hydraulic system (10), the main hydraulic cylinder (3), the piezoelectric sensor (202), the temperature sensor (204) and the electric telescopic rod (4) are all electrically connected to the control system (9). The system is configured to synchronously collect the reaction force and temperature data of each support unit (201). Based on the force-temperature coupling characteristics of the reaction force difference, temperature difference and the changing trend of each support unit (201), the system can determine the local warping, overall warping and warping area location of the laminated product.

5. The production apparatus for a high thermal conductivity C-grade fiberglass cloth laminate product according to claim 4, characterized in that, The hot press body (7) is equipped with a lifting platform (8) at the feeding end for transferring products to be pressed and products already pressed.

6. A method for producing a high thermal conductivity C-grade fiberglass cloth laminate, comprising the production apparatus for a high thermal conductivity C-grade fiberglass cloth laminate as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Hot pressing and curing are complete; release the main pressing pressure. S2. Collect the initial reaction force and surface temperature of each support unit (201) under the micro-gap constraint state, and determine whether there are areas with low force and abnormal temperature. S3. Control the start of the electric telescopic rod (4) so ​​that each support unit (201) retracts upward synchronously and slowly, and monitor the dynamic changes of reaction force and temperature in real time; S4. When multiple support units (201) simultaneously experience abnormal fluctuations in reaction force, pause the retraction action and continue demolding after the signal stabilizes; S5. Based on the coupling relationship between the reaction force distribution and the temperature distribution, determine the type of warpage and generate process feedback instructions.

7. The method for producing a high thermal conductivity C-grade fiberglass cloth laminate according to claim 6, characterized in that, S2 includes the following steps: S201. Calculate the average reaction force and average temperature of all the support units (201); S202. If the reaction force of a certain support unit (201) is higher than 130% of the average reaction force, and the temperature difference between its temperature and that of the adjacent support unit (201) exceeds 3 to 5°C, then the area is marked as a "constrained protrusion risk area". S203. If the reaction force is less than 70% of the average value but the temperature distribution is uniform, it is marked as "material shrinkage and depression risk zone".

8. The method for producing a high thermal conductivity C-grade fiberglass cloth laminate according to claim 7, characterized in that, S3 includes the following steps: S301. Within the range of 0.2 to 1.0 mm of the retraction stroke of the support unit (201), the reaction force and temperature of each support unit (201) are recorded simultaneously with displacement. S302. If the force value of the "constrained protrusion risk area" marked in S2 drops rapidly in the initial stage of retraction, it is confirmed that there is an upward warping defect in the area. S303. If the temperature of the support unit (201) corresponding to the geometric center of the product is low, and the force value attenuation in this area is less than 10% during the shrinkage process, it is determined to be a central shrinkage bulge.

9. The method for producing a high thermal conductivity C-grade fiberglass cloth laminate according to claim 8, characterized in that, S4 includes the following steps: S401. When three or more adjacent support units (201) simultaneously experience a sudden drop or rise in reaction force (fluctuation amplitude exceeding ±5N), the control system (9) shuts down the actuator of the electric telescopic rod (4); S402. Pause the retraction for 5-10 seconds to allow the internal stress of the product to release naturally. S403. Restart the electric telescopic rod (4) to complete the remaining part of the total retraction stroke of 0.2 to 3.0 mm at a low speed of 0.2 mm / s.

10. The method for producing a high thermal conductivity C-grade fiberglass cloth laminate according to claim 9, characterized in that, S5 includes the following steps: S501. Warping defects are classified into three categories: Material shrinkage type: abnormal reaction force but uniform temperature distribution, maximum temperature difference ≤2℃; Uneven cooling type: abnormal reaction force accompanied by significant temperature gradient, temperature difference between adjacent support units (201) ≥ 3℃; Potentially delayed type: The reaction force is normal, but the temperature is extremely uneven, with a maximum temperature difference ≥8℃; S502. For material shrinkage defects, send a raw material batch traceability alarm to the control system (9); S503. To address the uneven cooling defect, send cooling parameter optimization suggestions to the hot press control system (9); S504. For potential delayed defects, automatically mark the product and place it in an isolated inspection area, and record the temperature difference data for subsequent analysis; S505. When producing new specifications of products for the first time, a standard force-temperature joint reference database shall be established based on manually confirmed good product samples. Subsequent tests shall be based on this database for comparison and judgment.

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