Rotor iron core injection molding device and method

Abstract

The invention belongs to the technical field of rotor iron core injection molding, and particularly relates to a rotor iron core injection molding device and method.The rotor iron core injection molding device comprises a base, a rotating disc, lower molds, a machine box, hydraulic rods and an upper mold, the two lower molds are fixedly connected to the top of the rotating disc, the machine box is fixedly connected to the base, and the two hydraulic rods are installed in the machine box; the injection pressure stability is monitored in real time; and the displacement acquisition module is used for monitoring the position deviation of the iron core in the lower die in real time. The pressure acquisition module monitors the injection molding pressure stability in real time, the displacement acquisition module monitors the position deviation of the iron core in the lower mold in real time, the control module is matched to comprehensively analyze data of the two modules and generate an evaluation coefficient, and dynamic parameter adjustment based on the evaluation coefficient is combined. Defects such as flashes and shrinkage cavities caused by positioning deviation and instable filling are fundamentally avoided, and the comprehensive rejection rate is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of rotor core injection molding technology, and in particular to a rotor core injection molding apparatus and method. Background Technology

[0002] As the core component of the motor, the rotor core needs to be filled with insulating material (such as epoxy resin) between the silicon steel sheets through injection molding. The quality of its injection molding directly affects the motor's operational stability and service life.

[0003] The current mainstream production process has the following limitations: Traditional rotor core injection molding uses fixed-station molds, and the placement of the core depends on manual positioning. This can easily lead to positional deviations during injection molding, causing mold closing deviations and resulting in problems such as flash, shrinkage cavities, or internal bubbles in the injection molded parts (with a yield rate decrease of ≥15%). Therefore, corresponding improvements have been made to address this issue. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a rotor core injection molding device and method.

[0005] This invention proposes a rotor core injection molding device, comprising a base, a turntable, lower molds, a housing, hydraulic rods, and an upper mold. The turntable is rotatable on the top of the base. Two lower molds are fixedly connected to the top of the turntable. The housing is fixedly connected to the base. Two hydraulic rods are installed inside the housing. The upper mold is fixedly connected to the output shaft of the hydraulic rods extending downward from inside the housing. The device also includes:

[0006] The pressure acquisition module, installed on the injection runner, monitors the stability of the injection pressure in real time and generates a pressure fluctuation coefficient via the control module. The displacement acquisition module, installed on the upper mold, monitors the positional deviation of the iron core within the lower mold in real time and generates a positional offset coefficient via the control module. The control module performs a comprehensive analysis of the generated pressure fluctuation coefficient and positional offset coefficient to generate an evaluation coefficient. This evaluation coefficient is compared with a pre-set reference threshold, and the injection state is controlled based on the comparison result. The rotor iron core is placed in the lower mold, the turntable rotates to transport the lower mold to the injection station, the hydraulic rod drives the upper mold to move down and close with the lower mold, and the injection molding machine injects the iron core into the lower mold through the runner. During the process, the pressure acquisition module monitors the injection pressure in real time and generates a pressure fluctuation coefficient, and the displacement acquisition module monitors the positional deviation of the iron core within the lower mold and generates a positional offset coefficient. The control module performs a comprehensive analysis of the two coefficients to generate an evaluation coefficient. If the evaluation coefficient is within the reference threshold, injection continues; if it exceeds the threshold, the injection molding machine is controlled to adjust the injection parameters or pause injection to ensure injection quality.

[0007] Preferably, the upper mold is connected to an injection molding machine through a feed pipe at the top; the upper mold receives the injection molding raw material conveyed by the injection molding machine through the feed pipe. After the upper mold and the lower mold are closed, the injection molding raw material enters the mold cavity through the feed pipe to complete the injection molding filling of the rotor core.

[0008] Preferably, a speed-regulating motor is fixedly connected to the bottom of the base. The turntable is rotatably connected to the base through a turntable shaft, and the turntable shaft is fixedly connected to the output shaft of the speed-regulating motor. When the speed-regulating motor works, it drives the turntable shaft to rotate, thereby driving the turntable to rotate at a set speed on the top of the base, realizing the switching and conveying of the lower mold between different stations, and meeting the continuous progress of processes such as feeding, injection molding, and demolding.

[0009] Preferably, an installation groove communicated with the mold cavity is opened inside the lower mold. An electric push rod is fixedly connected in the installation groove, and a ejector pin for ejecting the injection-molded rotor core is fixedly connected to the output shaft of the electric push rod. After the rotor core is injection-molded, the upper mold moves up and resets. The electric push rod works to push the ejector pin to extend from the installation groove into the mold cavity, ejecting the injection-molded rotor core from the mold cavity of the lower mold, which is convenient for taking out the finished product.

[0010] Preferably, the output end and input end of the pressure acquisition module and the output end and input end of the displacement acquisition module are respectively electrically connected to the input end and output end of the control module. The output end of the control module is respectively electrically connected to the input end of the injection molding machine, the input end of the speed-regulating motor, and the input end of the hydraulic rod.

[0011] Preferably, the control module controls the execution steps of the injection molding state according to the comparison result as follows:

[0012] The pressure acquisition module acquires the stability of the injection molding pressure; the displacement acquisition module acquires the position deviation of the iron core in the lower mold; the control module calculates the pressure fluctuation coefficient, the position offset coefficient, and the evaluation coefficient Rpg; if Rpg < R threshold: maintain the current injection molding parameters; if Rpg ≥ R threshold: increase the injection molding pressure by 10%; extend the holding time by 15%; reduce the rotation speed of the turntable by 20%.

[0013] Preferably, the generation logic of the pressure fluctuation coefficient is:

[0014] The actual injection molding pressure at each moment within the T time period during the injection molding process is obtained through the pressure acquisition module, and based on the deviation degree between the actual injection molding pressure and the average injection molding pressure, the pressure fluctuation coefficient reflecting the degree of injection molding pressure fluctuation is calculated.

[0015] Preferably, the generation logic of the position offset coefficient is:

[0016] The actual offset at each moment within the T period when the lower mold reaches the injection molding station is obtained through the displacement acquisition module, and based on the deviation degree between the actual offset and the average offset, a position offset coefficient reflecting the position offset fluctuation degree is calculated.

[0017] Preferably, the generation logic of the evaluation coefficient includes:

[0018] By coupling the pressure fluctuation coefficient and the position offset coefficient, and performing dynamic weighing calculation in combination with a preset weight coefficient, an evaluation coefficient characterizing the comprehensive risk level of the injection molding process is generated.

[0019] The present invention also provides a rotor core injection molding method, including the following steps:

[0020] S1: Feeding: Place the rotor core to be injection molded into one of the lower molds.

[0021] S2: Station transfer: The control module starts the speed regulating motor, drives the turntable to rotate through the turntable shaft, and transfers the lower mold equipped with the rotor core to the injection molding station.

[0022] S3: Mold closing: The control module controls the hydraulic rod to extend, driving the upper mold to move down and precisely close the mold with the lower mold.

[0023] S4: Injection molding and monitoring: The injection molding machine injects raw materials into the cavity formed by the upper mold and the lower mold through the feed pipe. At the same time, the pressure acquisition module continuously acquires the injection molding pressure and generates a pressure fluctuation coefficient, and the displacement acquisition module continuously acquires the core position deviation and generates a position offset coefficient. The control module calculates the evaluation coefficient Rpg based on the two coefficients.

[0024] S5: Dynamic adjustment: If Rpg < R threshold, maintain the current injection molding parameters; if Rpg ≥ R threshold, the control module adjusts the injection molding machine to increase the injection molding pressure by 10% and extend the holding pressure time by 15%, and controls the speed regulating motor to reduce the turntable rotation speed by 20%.

[0025] S6: Demolding: After the injection molding is completed, the control module controls the hydraulic rod to contract to drive the upper mold to reset, and then starts the electric push rod to eject the molded rotor core from the lower mold through the ejector pin.

[0026] S7: Recycling: The turntable rotates to transfer the next lower mold to be injection molded to the injection molding station, and repeat steps S3 - S6 to achieve continuous injection molding.

[0027] Compared with the prior art, the present invention provides a rotor core injection molding device and method, having the following beneficial effects:

[0028] 1. A rotor core injection molding device and method, which uses a pressure acquisition module to monitor the stability of injection pressure in real time and a displacement acquisition module to monitor the positional deviation of the core in the lower mold in real time. This allows for timely detection of pressure fluctuations and positional deviations during the injection molding process. The control module performs comprehensive analysis of the data from both modules and generates evaluation coefficients. Combined with dynamic parameter adjustments based on these evaluation coefficients, this method fundamentally avoids defects such as flash and shrinkage caused by positioning deviations and unstable filling, effectively reducing the overall scrap rate.

[0029] 2. A rotor core injection molding device and method, wherein the control module can automatically adjust the injection parameters (such as increasing the injection pressure, extending the holding time, and reducing the rotation speed of the turntable) based on the comparison results of the evaluation coefficient and the reference threshold, without the need for manual intervention, reducing human operation error, shortening the parameter adjustment response time, and avoiding production interruption caused by manual adjustment, thereby effectively improving production efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a rotor core injection molding device proposed in this invention;

[0031] Figure 2 This is a schematic diagram of the bottom structure of a rotor core injection molding device proposed in this invention;

[0032] Figure 3 This is a schematic diagram of the upper mold structure of a rotor core injection molding device proposed in this invention;

[0033] Figure 4 This is a schematic diagram of the bottom structure of the upper mold of a rotor core injection molding device proposed in this invention;

[0034] Figure 5 This is a schematic diagram of the internal structure of the lower mold of a rotor core injection molding device proposed in this invention;

[0035] Figure 6 This is a system block diagram of a rotor core injection molding device proposed in this invention.

[0036] In the diagram: 1. Base; 2. Turntable; 3. Lower mold; 4. Chassis; 5. Hydraulic rod; 6. Upper mold; 7. Pressure acquisition module; 8. Displacement acquisition module; 9. Feed pipe; 10. Speed ​​regulating motor; 11. Turntable shaft; 12. Mounting slot; 13. Electric actuator; 14. Ejector pin. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Reference Figures 1-6 A rotor core injection molding device includes a base 1, a turntable 2, a lower mold 3, a housing 4, hydraulic rods 5, and an upper mold 6. The turntable 2 is rotatable on the top of the base 1. Two lower molds 3 are fixedly connected to the top of the turntable 2. The housing 4 is fixedly connected to the base 1. Two hydraulic rods 5 are installed inside the housing 4. The upper mold 6 is fixedly connected to the output shaft of the hydraulic rods 5 extending downward from inside the housing 4. The device also includes:

[0040] The pressure acquisition module 7 is installed on the injection molding flow channel to monitor the stability of injection molding pressure in real time and generate a pressure fluctuation coefficient through the control module.

[0041] The displacement acquisition module 8 is installed on the upper mold 6 to monitor the position deviation of the iron core in the lower mold 3 in real time, and to generate the position offset coefficient through the control module.

[0042] The control module performs a comprehensive analysis of the generated pressure fluctuation coefficient and position offset coefficient to generate an evaluation coefficient. The evaluation coefficient is then compared with a pre-set reference threshold, and the injection molding state is controlled based on the comparison results.

[0043] It should be noted that the pressure acquisition module 7 can be a piezoelectric pressure sensor or other device that can monitor the stability of injection pressure in real time, the displacement acquisition module 8 can be a laser displacement sensor or other device that can monitor the positional deviation of the iron core in the lower mold 3 in real time, and the control module is an embedded controller (such as the STM32 series) that integrates data fusion algorithms. Therefore, the pressure acquisition module 7, displacement acquisition module 8 and control module are not specifically limited here and can be selected according to actual needs.

[0044] In use, the rotor core is placed in the lower mold 3. The turntable 2 rotates to transport the lower mold 3 to the injection molding station. The hydraulic rod 5 drives the upper mold 6 to move down and close with the lower mold 3. The injection molding machine injects the core into the lower mold 3 through the flow channel. During the process, the pressure acquisition module 7 monitors the injection pressure in real time and generates a pressure fluctuation coefficient. The displacement acquisition module 8 monitors the position deviation of the core in the lower mold 3 in real time and generates a position offset coefficient. The control module analyzes the two coefficients to generate an evaluation coefficient. If the evaluation coefficient is within the reference threshold, the injection continues. If it exceeds the threshold, the injection molding machine is controlled to adjust the injection parameters or pause the injection to ensure the injection quality.

[0045] The output and input terminals of the pressure acquisition module 7 and the displacement acquisition module 8 are electrically connected to the input and output terminals of the control module, respectively. The output terminal of the control module is electrically connected to the input terminal of the injection molding machine, the input terminal of the speed regulating motor 10, and the input terminal of the hydraulic rod 5, respectively.

[0046] In another embodiment, the control module performs a comprehensive analysis of the generated pressure fluctuation coefficient and position offset coefficient to generate an evaluation coefficient. The evaluation coefficient is then compared with a pre-set reference threshold, and the execution steps of controlling the injection molding state are as follows:

[0047] Real-time monitoring: Pressure acquisition module 7 collects the stability of injection pressure; displacement acquisition module 8 collects the positional deviation of the iron core within the lower mold 3;

[0048] Coefficient calculation:

[0049] Pressure fluctuation coefficient Pσ: quantifies the degree of fluctuation in resistance encountered by molten material when filling the mold cavity during injection molding. It directly reflects the smoothness of the screw propulsion of the injection molding machine and reveals the stability of the process.

[0050] The generation logic for the pressure fluctuation coefficient is as follows:

[0051] S1. The actual injection pressure at different times within time T during injection is acquired through the pressure acquisition module 7, and the actual injection pressure acquired at time j within time T is calibrated as... j = 1, 2, 3, ..., u, where j is a positive integer;

[0052] S2. Calculate the pressure fluctuation coefficient. The expression for the calculation is:

[0053]

[0054] In the formula, denoted as the average injection pressure over time T; u represents the number of samples taken over time T.

[0055] Position offset coefficient Dδ: Quantifies the radial position stability and accuracy of the rotor core in the mold cavity. It reflects the alignment degree between the core center and the ideal center of the mold before the start of injection molding, which is caused by feeding placement errors, fixture positioning deviations, or rotational mechanism precision fluctuations.

[0056] Among them, the generation logic of the position offset coefficient is as follows:

[0057] S1. Obtain the actual offset amounts at different moments within time T when the lower mold 3 reaches the injection molding station through the displacement acquisition module 8, and calibrate the actual offset amount obtained at the i-th moment within time T as , where i = 1, 2, 3, ……, s, and i is a positive integer.

[0058] S2. Calculate the position offset coefficient, and the calculation expression is:

[0059]

[0060] In the formula, is the average offset amount within time T; s is the number of sampling times within time T.

[0061] Evaluation coefficient Rpg: It is a risk rating index that combines the pressure fluctuation coefficient and the position offset coefficient, used to comprehensively evaluate the overall risk probability of producing defective products during the current production cycle. It is analyzed formulaically through the control module, according to the formula:

[0062]

[0063] In the formula, w1 and w2 are the position offset weight coefficient and the pressure fluctuation weight coefficient respectively (such as w1 = 1.2, w2 = 0.8, and the specific values need to be dynamically determined in combination with experimental data). The weight coefficients w1 and w2 can be determined through injection molding tests: First, inject 100 samples under standard process parameters, record the Pσ and Dδ values each time, and conduct regression analysis in combination with the finished product quality (such as whether there are flashings and shrinkage holes) to determine the optimal weight ratio. The threshold Rth can take the upper limit of the Rpg value of qualified products.

[0064] Dynamic adjustment: If Rpg < Rth: The system determines that the current state is "good" and maintains the current injection molding parameters; if Rpg ≥ Rth: The system determines that there is a "quality risk", increases the injection pressure by 10% (to compensate for insufficient filling); extends the holding pressure time by 15% (to reduce shrinkage holes); reduces the rotation speed of the turntable 2 by 20% (to improve positioning accuracy);

[0065] It should be added that when the system determines that there is a "quality risk", the relative magnitudes of the Dδ and Pσ values that make up the Rpg value will jointly determine the adjustment strategy:

[0066] The first type: Dδ contributes to the main risk (i.e., high Dδ and low Pσ): Rpg exceeding the standard is mainly caused by position offset. Strategy: The control module commands to reduce the rotation speed of turntable 2 (e.g., reduce it by 20%), sacrificing a little bit of the cycle time to obtain higher positioning stability, fundamentally reducing Dδ in subsequent batches.

[0067] The second type: Pσ contributes the main risk (i.e., Pσ is high and Dδ is low): Rpg exceeding the standard is mainly caused by process resistance. Strategy: The control module commands to slightly increase the injection pressure (e.g., +5%) and extend the holding time (e.g., +10%) to overcome the resistance and ensure the filling quality.

[0068] The third type: Both Dδ and Pσ are high: The system determines that there is a compound fault. Strategy: Execute the combination of the above adjustments (reducing speed + increasing pressure + extending holding pressure), and after the end of this injection cycle, issue a maintenance warning of "suggesting inspection of mold and iron core" instead of immediately stopping the machine, thereby balancing efficiency and quality.

[0069] In addition, the system also features safety interlocks and absolute threshold judgment (highest priority). Before calculating any coefficients, a hard safety judgment is performed to ensure equipment safety.

[0070] Position exceeded limit interruption:

[0071] When the laser displacement sensor detects the absolute value of the iron core offset If the value is >2.0mm (this is an example and can be set according to the mold design), the injection cycle will be immediately interrupted, and an audible and visual alarm will be issued, indicating "Critical error in core position". Since injection at this point will inevitably result in scrap or even damage to the mold, there is no need to calculate Rpg again.

[0072] Pressure exceeding limit interruption:

[0073] When the piezoelectric pressure sensor detects instantaneous pressure If the maximum safe pressure (e.g., 90 MPa) is reached, the injection molding process will be immediately terminated, the injection molding machine will rise and an alarm will sound, indicating "system overpressure". This is a protection mechanism for the injection molding machine and the mold.

[0074] The upper mold 6 is connected to the injection molding machine via the feed pipe 9 at the top.

[0075] In use, the upper mold 6 receives the injection molding material delivered by the injection molding machine through the feed pipe 9. After the upper mold 6 and the lower mold 3 are closed, the injection molding material enters the mold cavity through the feed pipe 9 to complete the injection filling of the rotor core.

[0076] Among them, a speed-regulating motor 10 is fixedly connected to the bottom of the base 1, and the turntable 2 is rotatably connected to the base 1 through the turntable shaft 11. The turntable shaft 11 is fixedly connected to the output shaft of the speed-regulating motor 10.

[0077] During use, the speed-regulating motor 10 operates to drive the turntable shaft 11 to rotate, thereby driving the turntable 2 to rotate on the top of the base 1 at a set speed, realizing the switching and conveying of the lower mold 3 between different workstations, and meeting the continuous progress of processes such as feeding, injection molding, and demolding.

[0078] In addition, an installation groove 12 communicating with the mold cavity is formed inside the lower mold 3. An electric push rod 13 is fixedly connected inside the installation groove 12, and a ejector pin 14 for ejecting the injection-molded rotor core is fixedly connected to the output shaft of the electric push rod 13;

[0079] During use, after the rotor core is injection-molded, the upper mold 6 moves upward and resets. The electric push rod 13 operates to push the ejector pin 14 to extend from the installation groove 12 into the mold cavity, ejecting the injection-molded rotor core from the mold cavity of the lower mold 3, facilitating the taking out of the finished product.

[0080] The present invention also provides a method for injection-molding a rotor core, including the following steps:

[0081] S1: Feeding: Place the rotor core to be injection-molded in one of the lower molds;

[0082] S2: Workstation conveying: The control module starts the speed-regulating motor, drives the turntable to rotate through the turntable shaft, and conveys the lower mold equipped with the rotor core to the injection-molding workstation;

[0083] S3: Mold closing: The control module controls the hydraulic rod to extend, driving the upper mold to move downward and precisely close with the lower mold;

[0084] S4: Injection molding and monitoring: The injection molding machine injects raw materials into the cavity formed by the upper mold and the lower mold through the feed pipe. At the same time, the pressure acquisition module collects the injection pressure in real time and generates a pressure fluctuation coefficient, and the displacement acquisition module collects the core position deviation in real time and generates a position offset coefficient. The control module calculates and evaluates the coefficient Rpg according to the two coefficients;

[0085] S5: Dynamic adjustment: If Rpg < R threshold, maintain the current injection molding parameters; if Rpg ≥ R threshold, the control module adjusts the injection molding machine to increase the injection pressure by 10%, extend the holding pressure time by 15%, and control the speed-regulating motor to reduce the turntable rotation speed by 20%;

[0086] S6: Demolding: After injection molding, the control module controls the hydraulic rod to contract to drive the upper mold to reset, and then starts the electric push rod to eject the formed rotor core from the lower mold through the ejector pin;

[0087] S7: Recycling: The turntable rotates to convey the next lower mold to be injection-molded to the injection-molding workstation, and repeat steps S3 - S6 to achieve continuous injection molding.

[0088] 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 rotor core injection molding device comprising a base (1), a turntable (2), a lower mold (3), a machine case (4), a hydraulic rod (5) and an upper mold (6), characterized in that, The rotating disc (2) can rotate on the top of the base (1), two lower molds (3) are respectively fixedly connected on the top of the rotating disc (2), the cabinet (4) is fixedly connected on the base (1), two hydraulic rods (5) are installed in the cabinet (4), the upper mold (6) is fixedly connected on the output shaft of the hydraulic rod (5) which extends downward from the cabinet (4), and the control module is further connected with the pressure acquisition module (7) and the displacement acquisition module (8). The pressure acquisition module (7) is used for monitoring the injection pressure stability in real time, and generating a pressure fluctuation coefficient through the control module; The displacement acquisition module (8) is used for monitoring the position deviation of the iron core in the lower mold (3) in real time, and generating a position offset coefficient through the control module; The control module comprehensively analyzes the generated pressure fluctuation coefficient and position offset coefficient to generate an evaluation coefficient, compares the evaluation coefficient with a pre-set reference threshold, and controls the injection state according to the comparison result.

2. A rotor core injection molding device according to claim 1, characterized by The upper mold (6) is connected with the injection molding machine through the feeding pipe (9) at the top.

3. The rotor core injection molding device according to claim 1, characterized by The base (1) is fixedly connected with a speed regulating motor (10) at the bottom, the rotating disc (2) is rotatably connected with the base (1) through a rotating disc shaft (11), and the rotating disc shaft (11) is fixedly connected with the output shaft of the speed regulating motor (10).

4. The rotor core injection molding device according to claim 1, characterized by The lower mold (3) is internally provided with an installation groove (12) communicated with a mold cavity, the installation groove (12) is fixedly connected with an electric push rod (13), and the output shaft of the electric push rod (13) is fixedly connected with a ejector pin (14) for ejecting the injection-molded rotor iron core.

5. The rotor core injection molding device according to claim 2, characterized by The output end and the input end of the pressure acquisition module (7) and the output end and the input end of the displacement acquisition module (8) are electrically connected with the input end and the output end of the control module respectively, and the output end of the control module is electrically connected with the input end of the injection molding machine, the input end of the speed regulating motor (10) and the input end of the hydraulic rod (5) respectively.

6. The rotor core injection molding device according to claim 1, wherein The execution steps of the control module for controlling the injection state according to the comparison result are as follows: The pressure acquisition module (7) acquires the injection pressure stability, the displacement acquisition module (8) acquires the position deviation of the iron core in the lower mold (3), the control module calculates the pressure fluctuation coefficient, the position offset coefficient and the evaluation coefficient Rpg, if Rpg < R threshold, the current injection parameters are maintained, if Rpg ≥ R threshold, the injection pressure is increased by 10%, the pressure maintaining time is prolonged by 15%, and the rotating speed of the rotating disc (2) is reduced by 20%.

7. The rotor core injection molding device according to claim 1, wherein The generation logic of the pressure fluctuation coefficient is as follows: The actual injection pressure at each time in a T time period during the injection process is acquired through the pressure acquisition module (7), the pressure fluctuation coefficient reflecting the fluctuation degree of the injection pressure is calculated based on the deviation degree of the actual injection pressure and the average injection pressure.

8. The rotor core injection molding device according to claim 1, characterized by The generation logic of the position offset coefficient is as follows: The actual offset amount at each time in a T time period when the lower mold (3) reaches the injection station is acquired through the displacement acquisition module (8), the position offset coefficient reflecting the fluctuation degree of the position offset is calculated based on the deviation degree of the actual offset amount and the average offset amount.

9. The rotor core injection molding device according to claim 1, wherein The generation logic of the evaluation coefficient includes: The evaluation coefficient representing the comprehensive risk level of the injection process is generated by coupling the pressure fluctuation coefficient and the position offset coefficient and dynamically weighting calculation combined with the pre-set weight coefficient.

10. A rotor core injection molding method using the rotor core injection molding apparatus according to any one of claims 1 to 9, characterized by, The following steps are included: S1: loading: placing the rotor core to be injection molded in one of the lower molds; S2: station conveying: the control module starts the speed regulating motor to drive the turntable to rotate, and the lower mold with the rotor core is conveyed to the injection molding station; S3: mold closing: the control module controls the hydraulic rod to extend, and drives the upper mold to move down and accurately close with the lower mold; S4: injection molding and monitoring: the injection molding machine injects raw materials into the cavity formed by the upper and lower molds through the feeding pipe, and the pressure acquisition module acquires the injection pressure in real time and generates the pressure fluctuation coefficient, the displacement acquisition module acquires the core position deviation in real time and generates the position offset coefficient, and the control module calculates the evaluation coefficient Rpg according to the two coefficients; S5: dynamic adjustment: if Rpg < R threshold, maintain the current injection molding parameters; if Rpg ≥ R threshold, the control module adjusts the injection molding machine to increase the injection pressure by 10% and prolong the holding time by 15%, and controls the speed regulating motor to reduce the rotation speed of the turntable by 20%; S6: demolding: after the injection molding is completed, the control module controls the hydraulic rod to retract to drive the upper mold to reset, and then starts the electric push rod to eject the molded rotor core from the lower mold through the ejector pin; S7: cycle: the next lower mold to be injection molded is conveyed to the injection molding station by the rotation of the turntable, and steps S3-S6 are repeated to realize continuous injection molding.

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