A design method for a core injection mold

Abstract

The present invention relates to the field of iron core injection molding technology, and specifically to a design method for a mold for iron core injection molding, the control method comprising the following steps: selecting the injection molding material for the iron core, and recording the physical properties of the injection molding material respectively; designing a mold model that matches the iron core structure, and recording the physical properties of the mold model; using the physical properties in the above steps, combined with mathematical model tools, to build a simulation system for the iron core injection molding model, observe and evaluate the response and performance of the simulation system; assembling the finished mold according to the simulation results, and verifying the injection molding quality of the iron core made by the finished mold. The purpose of the present invention is to provide a design method for a mold for iron core injection molding, which solves the problem of slow adjustment and verification of the iron core injection molding process.

Description

Technical Field

[0001] The invention relates to the technical field of iron core injection molding, and in particular to a design method for a mold for iron core injection molding. Background Art

[0002] Placing parts into an injection mold for encapsulation is called in-mold molding, and iron core in-mold molding is a common motor component protection process, mainly used for protecting electrodes and iron cores in transformers.

[0003] At present, the mold structure and injection molding materials of in-mold injection molding are universal. Due to the different working environments of different motors and transformer cores, the required injection molding conditions are also different. The staff needs to continuously verify the performance of the core after core injection molding, and manually adjust the relevant parameters of the injection molding materials and mold structure to continuously improve the performance of the core. However, the universal mold structure and injection molding materials can no longer meet the increasing number of usage scenarios and the inefficient manual adjustment methods. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a design method for a core injection mold, which solves the problem of slow adjustment and verification of the core injection process.

[0005] The present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention discloses a method for designing a mold for an iron core injection molding, which comprises the following steps:

[0007] S100. Select the injection molding material for the core and record the physical properties of the injection molding material;

[0008] S200. Designing a mold model that matches the core structure and recording the physical properties of the mold model;

[0009] S300. Using the physical characteristics in step S100 to step S200, combined with mathematical model tools, build a simulation system for the core injection model, observe and evaluate the response and performance of the simulation system;

[0010] S400. Assemble the finished mold according to the simulation results, and perform performance verification on the injection molding quality of the iron core made from the finished mold.

[0011] In combination with the first aspect, further, in step S300, the simulation system may construct an equivalent physical equation of the injection molding process, and the method for constructing the equivalent physical equation of the injection molding material is:

[0012] The material viscosity Indicates the physical properties of injection molding materials, material viscosity The calculation formula is:

[0013]

[0014] in, is an external force, is the cross-sectional area of ​​the material, It’s time;

[0015] The mold rigidity, parting surface flatness, runner pressure loss value, cooling time, manufacturing tolerance, and assembly error represent the physical properties of the mold model. The calculation formula is:

[0016]

[0017] in, E is the elastic modulus of the mold material, is the interface moment of inertia, is the die length;

[0018] Parting surface flatness The calculation formula is:

[0019]

[0020] in, is the height difference of the parting surface, is the length of the parting surface;

[0021] The calculation formula of flow channel pressure loss value is:

[0022]

[0023] in, Flow channel length, is the flow rate of injection material, is the flow channel radius;

[0024] The calculation formula for cooling time is:

[0025]

[0026] in, is the material density of the injection molding material, is the specific heat capacity of the injection molding material, is the wall thickness of the core, is the thermal conductivity of the core, is the temperature difference between the mold core and the outside world;

[0027] The formula for calculating manufacturing tolerance is:

[0028]

[0029] in, is the mold size, is the size of the injection molded part;

[0030] The calculation formula for assembly error is:

[0031]

[0032] in, is the assembly error of each component in the mold, is the number of components;

[0033] The injection molding materials with different physical properties and the mold models with different physical properties are simulated within a unit time, and the output value of the simulation system is recorded.

[0034] In combination with the first aspect, further, the numerical values ​​of the virtual sensors in the database are used to evaluate the response and performance of the simulation system.

[0035] In combination with the first aspect, further, in step S400, the step of performing performance verification on the injection molding quality of the iron core is:

[0036] By comparing the output value of the simulation system with the target value of the assembled mold product, the error ;

[0037] Calculate the control quantity according to the PID control algorithm , control amount The calculation formula is:

[0038]

[0039] in, is the proportionality coefficient, is the integration coefficient, is the integral of the error, is the differential coefficient, is the derivative of the error;

[0040] The amount of control obtained Import the simulation system to adjust the output value of the simulation system.

[0041] In combination with the first aspect, further, in step S400, the calculation formula for the performance verification of the injection molded part of the finished mold is:

[0042]

[0043] in, is the performance verification score of the mold, It is the test value of injection molding performance. is the average value of injection molding performance, is the sample size.

[0044] In the second aspect, the present invention also discloses an automatic iron core punching structure, which includes a pressing mechanism, a jig located below the pressing mechanism, and a mold. The pressing mechanism is used to punch the iron core located in the jig into the mold; the mold is made by the design method of the above-mentioned iron core injection mold.

[0045] Beneficial effects of the present invention:

[0046] A method for designing a mold for iron core injection molding of the present invention analyzes the physical properties of the injection molding material and the mold model of the iron core, selects or designs a simulation system for the corresponding iron core injection molding model, and according to the simulation results, a fast process from injection molding material and finished mold assembly to performance verification can be performed. While improving the efficiency of iron core injection molding and mold design and verification, it accelerates the popularization of injection molded iron cores customized based on different usage scenarios, and effectively improves the efficiency of iron core injection molding process adjustment and verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0048] Figure 1 The present invention is a flow chart of a method for designing a mold for core injection molding.

[0049] Figure 2 It is a structural schematic diagram of the automatic iron core punching structure of the present invention.

[0050] Reference numerals

[0051] Pressing mechanism--1, fixture--2. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0053] Placing parts into an injection mold for encapsulation is called in-mold molding, and iron core in-mold molding is a common motor component protection process, mainly used for protecting electrodes and iron cores in transformers.

[0054] At present, the mold structure and injection molding materials of in-mold injection molding are universal. Due to the different working environments of different motors and transformer cores, the required injection molding conditions are also different. The staff needs to continuously verify the performance of the core after core injection molding, and manually adjust the relevant parameters of the injection molding materials and mold structure to continuously improve the performance of the core. However, the universal mold structure and injection molding materials can no longer meet the increasing number of usage scenarios and the inefficient manual adjustment methods.

[0055] Example 1

[0056] In order to solve the above problems, this embodiment discloses a method for designing a mold for iron core injection molding, which comprises the following steps:

[0057] S100. Select the injection molding material for the core and record the physical properties of the injection molding material;

[0058] S200. Designing a mold model that matches the core structure and recording the physical properties of the mold model;

[0059] S300. Using the physical characteristics in step S100 to step S200, combined with mathematical model tools, build a simulation system for the core injection model, observe and evaluate the response and performance of the simulation system;

[0060] S400. Assemble the finished mold according to the simulation results, and perform performance verification on the injection molding quality of the iron core made from the finished mold.

[0061] In order to more clearly illustrate the design method of the core injection mold of the present invention, Figure 1 Each step in the embodiment of the present invention is described in detail.

[0062] Furthermore, in step S300, the simulation system may construct an equivalent physical equation of the injection molding process, and the method for constructing the equivalent physical equation of the injection molding material is:

[0063] The material viscosity Indicates the physical properties of injection molding materials, material viscosity The calculation formula is:

[0064]

[0065] in, is an external force, is the cross-sectional area of ​​the material, is time, external force It reflects the fluidity of the injection molding material under specific conditions. The cross-sectional area of ​​the material affects the distribution of the force. The viscosity of the material Indicates the flow resistance of the material, affects the fluidity during the injection molding process, and ultimately affects the coverage rate and thickness of the plastic on the iron core after injection molding, thus reflecting its physical properties;

[0066] The mold rigidity, parting surface flatness, runner pressure loss value, cooling time, manufacturing tolerance, and assembly error represent the physical properties of the mold model. The calculation formula is:

[0067]

[0068] in, E is the elastic modulus of the mold material, is the interface moment of inertia, is the die length;

[0069] Parting surface flatness The calculation formula is:

[0070]

[0071] in, is the height difference of the parting surface, is the length of the parting surface;

[0072] The calculation formula of flow channel pressure loss value is:

[0073]

[0074] in, Flow channel length, is the flow rate of injection material, is the flow channel radius;

[0075] The calculation formula for cooling time is:

[0076]

[0077] in, is the material density of the injection molding material, is the specific heat capacity of the injection molding material, is the wall thickness of the core, is the thermal conductivity of the core, is the temperature difference between the mold core and the outside world;

[0078] The formula for calculating manufacturing tolerance is:

[0079]

[0080] in, is the mold size, is the size of the injection molded part;

[0081] The calculation formula for assembly error is:

[0082]

[0083] in, is the assembly error of each component in the mold, is the number of components;

[0084] The injection molding materials with different physical properties and the mold models with different physical properties are simulated within a unit time, and the output value of the simulation system is recorded.

[0085] Furthermore, the numerical values ​​of the virtual sensors in the database are used to evaluate the response and performance of the simulation system.

[0086] Furthermore, in step S400, the steps of verifying the performance of the injection molding quality of the iron core are as follows:

[0087] By comparing the output value of the simulation system with the target value of the assembled mold product, the error ;

[0088] Calculate the control quantity according to the PID control algorithm , control amount The calculation formula is:

[0089]

[0090] in, is the proportionality coefficient, is the integration coefficient, is the integral of the error, is the differential coefficient, is the derivative of the error;

[0091] The amount of control obtained Import the simulation system to adjust the output value of the simulation system.

[0092] In combination with the first aspect, further, in step S400, the calculation formula for the performance verification of the injection molded part of the finished mold is:

[0093]

[0094] in, is the performance verification score of the mold, It is the test value of injection molding performance. is the average value of injection molding performance, is the sample size.

[0095] Performance verification scores obtained through continuous mold design , the accuracy of materials and simulation systems in mold design can be obtained, and the performance of core injection molding can be gradually improved.

[0096] In addition, this embodiment also discloses an automatic core punching structure, the structure of which is as follows: Figure 2 As shown, the automatic iron core punching structure includes a pressing mechanism 1, a jig 2 located below the pressing mechanism 1, and a mold (not shown in the figure), wherein the pressing mechanism 1 is used to punch the iron core located in the jig 2 into the mold; the mold is made by the design method of the above-mentioned iron core injection mold.

[0097] Through the design method of the iron core injection molding mold of the present embodiment, the physical properties of the iron core injection molding material and the mold model are analyzed, and the corresponding simulation system of the iron core injection molding model is selected or designed. According to the simulation results, a fast process from injection molding materials and finished mold assembly to performance verification can be performed. While improving the design and verification efficiency of iron core injection molding and molds, it accelerates the popularization of injection molded iron cores customized based on different usage scenarios, and effectively improves the adjustment and verification efficiency of the iron core injection molding process.

[0098] Example 2

[0099] This embodiment provides a computer device, including a processor and a storage medium;

[0100] The storage medium is used to store instructions;

[0101] The processor is used to operate according to the instructions to execute the steps of any method described in Example 1.

[0102] Example 3

[0103] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the method described in Embodiment 1 are implemented.

[0104] In summary, the present invention provides a battery cell safety management system, method, electronic device and storage medium for a mobile power source, which respectively detects the temperature, current and voltage of the battery pack of the mobile power source, and makes targeted adjustments according to the changes in these three parameters, so as to achieve real-time control of the input or output power of the battery pack according to the user's usage scenario, thereby improving the safety of the mobile power source.

[0105] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0106] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0107] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0108] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for designing a core injection mold, characterized in that: The following steps are involved: S100. Select the injection molding material for the core and record the physical properties of the injection molding material; S200. Designing a mold model that matches the core structure and recording the physical properties of the mold model; S300. Using the physical characteristics in step S100 to step S200, combined with mathematical model tools, build a simulation system for the core injection model, observe and evaluate the response and performance of the simulation system; S400 assembling the finished mold according to the simulation results, and verifying the injection quality of the core made by the finished mold; In step S300, the simulation system can construct an equivalent physical equation for the injection molding process. The method for constructing the equivalent physical equation for the injection molding material is: The material viscosity Indicates the physical properties of injection molding materials, material viscosity The calculation formula is: in, is an external force, is the cross-sectional area of ​​the material, It’s time; The mold rigidity, parting surface flatness, runner pressure loss value, cooling time, manufacturing tolerance, and assembly error represent the physical properties of the mold model. The calculation formula is: in, E is the elastic modulus of the mold material, is the interface moment of inertia, is the die length; Parting surface flatness The calculation formula is: in, is the height difference of the parting surface, is the length of the parting surface; The calculation formula of flow channel pressure loss value is: in, Flow channel length, is the flow rate of injection material, is the flow channel radius; The calculation formula for cooling time is: in, is the material density of the injection molding material, is the specific heat capacity of the injection molding material, is the wall thickness of the core, is the thermal conductivity of the core, is the temperature difference between the mold core and the outside world; The formula for calculating manufacturing tolerance is: in, is the mold size, is the size of the injection molded part; The calculation formula for assembly error is: in, is the assembly error of each component in the mold, is the number of components; The injection molding materials with different physical properties and the mold models with different physical properties are simulated within a unit time, and the output value of the simulation system is recorded.

2. The method for designing a core injection mold according to claim 1, characterized in that: The response and performance of the simulation system are evaluated using the values ​​of the virtual sensors in the database.

3. The method for designing a core injection mold according to claim 1, characterized in that: In step S400, the steps of verifying the performance of the injection molding quality of the iron core are as follows: By comparing the output value of the simulation system with the target value of the assembled mold product, the error ; Calculate the control quantity according to the PID control algorithm , control amount The calculation formula is: in, is the proportionality coefficient, is the integration coefficient, is the integral of the error, is the differential coefficient, is the derivative of the error; The amount of control obtained Import the simulation system to adjust the output value of the simulation system.

4. The method for designing a core injection mold according to claim 1, characterized in that: In step S400, the calculation formula for the performance verification of the injection molded part of the finished mold is: in, is the performance verification score of the mold, It is the test value of injection molding performance. is the average value of injection molding performance, is the sample size.

5. An automatic core punching structure, comprising a pressing mechanism, a jig located below the pressing mechanism, and a mold, wherein the pressing mechanism is used to punch the core in the jig into the mold; It is characterized in that The mold is made by the design method of the iron core injection mold according to any one of claims 1-4.

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