Dynamic simulation method and device, terminal equipment and storage medium

Abstract

The invention discloses a dynamic simulation method and device, terminal equipment and a storage medium, and relates to the technical field of data analysis, and the method comprises the steps: obtaining test data of a key part; and according to the test data, performing dynamic simulation through a pre-established simulation virtual model, and outputting dynamic characteristic parameters and a load curve. According to the scheme, the injection molding machine and the die-casting machine are dynamically simulated, dynamic performance parameters of equipment can be output, the performance of the injection molding machine and the performance of the die-casting machine in the working state can be comprehensively obtained, and design engineers can conveniently and rapidly make modification and optimization decisions. The dynamic simulation technology is fully utilized, so that the product performance is in an industry leading position, the deep application of the dynamic simulation technology is deepened, the product research and development speed is increased, the product research and development cost is reduced, and the product market competitiveness is enhanced.

Description

Technical Field

[0001] The present application relates to the field of data analysis technology, and in particular to a dynamic simulation method, apparatus, terminal device and storage medium. Background Art

[0002] At present, the injection molding and die-casting machine industries lack the application of dynamic simulation technology in product design. Design engineers cannot obtain the dynamic performance parameters of their designed products and cannot effectively evaluate whether their products meet the design requirements, resulting in repeated abnormal problems in subsequent tests. Once a problem occurs, the product returns to the design end for design changes, reproduction and verification, which will seriously affect the speed of product development, waste a lot of R&D costs, and reduce product market competitiveness. Injection molding and die-casting machines are complex systems involving disciplines covering electromechanical and hydraulic multi-physics field technologies. At present, design engineers from different disciplines conduct design analysis in their own fields and cannot perform interdisciplinary joint design analysis, resulting in incompatibility between different disciplines in actual product application, various problems in product operation, and the system cannot reach the optimal state. Summary of the invention

[0003] The main purpose of this application is to provide a dynamic simulation method, apparatus, terminal device and storage medium, aiming to solve the technical problem of how to effectively apply dynamic simulation technology when using injection molding machines and die-casting machines for product design.

[0004] To achieve the above purpose, the present application proposes a dynamic simulation method, which includes:

[0005] Obtain test data of key components in injection molding and die casting machines;

[0006] According to the test data, dynamic simulation is performed through a pre-established simulation virtual model to output dynamic characteristic parameters and load curves.

[0007] In one embodiment, the step of obtaining test data of key components in the injection molding machine and the die casting machine includes:

[0008] Recording of quality characteristics and initial positions of key components in injection molding and die casting machines;

[0009] According to the quality characteristics of the key components and the initial positions, relevant tests are performed on corresponding physical prototypes to obtain test data of the key components.

[0010] In one embodiment, before the step of performing dynamic simulation according to the test data through a pre-established simulation virtual model to output dynamic characteristic parameters and load curves, it also includes: modeling according to key components to obtain a pre-established simulation virtual model.

[0011] In one embodiment, the step of modeling the key components to obtain a pre-established simulation virtual model includes:

[0012] Simplify the computer-aided design CAD model of the injection molding machine and / or die-casting machine based on the measured positions of key components, and export the simplified CAD model in an intermediate format;

[0013] By using the dynamic simulation function, material parameters and corresponding performance parameters are assigned to the key components in the simplified CAD model to obtain a CAD model with perfect characteristic attributes;

[0014] Establish constraint relationships between key components;

[0015] Based on the CAD model with perfect characteristic attributes and the constraint relationship between key components, the key components are flexibly processed using the modal synthesis method to form a rigid-flexible coupled simulation virtual model, which is a pre-established simulation virtual model.

[0016] In one embodiment, the steps of performing flexible processing on the key components by using the modal synthesis method based on the CAD model improved by the characteristic attributes and the constraint relationship between the key components to form a rigid-flexible coupled simulation virtual model include:

[0017] Using the CAD model with perfect feature attributes and the constraint relationship between key components, the degrees of freedom of each interface of the key components are fixed to establish the connection between the key components;

[0018] Based on the connection between the key components, the low-order main modal set and the constraint modal set of the key components are calculated, the high-order main modal set is deleted, and the main modal set is reduced, the main modal of the preset order is retained, and the key components of the flexible body are established based on the main modal of the preset order;

[0019] Establishing the motion equations of the key components of the flexible body in the corresponding modes and the motion equations in the overall coordinates;

[0020] According to the motion equations of the key flexible body components in the corresponding modes and the motion equations in the overall coordinates, the substructure mass and stiffness matrix of each flexible body component and rigid body component are integrated to obtain a rigid-flexible coupling simulation virtual model.

[0021] In one embodiment, the test data includes stroke data, and the stroke data includes displacement and speed curve of the clamping cylinder piston rod. After the step of modeling the key components to obtain a pre-established simulation virtual model, the method further includes:

[0022] The piston rod of the clamping cylinder in the rigid-flexible coupling simulation virtual model is used as the driving component of the rigid-flexible coupling virtual model;

[0023] The displacement and speed curve of the clamping cylinder piston rod are input into the clamping cylinder piston rod to apply a driving force to the rigid-flexible coupled simulation virtual model.

[0024] In one embodiment, the test data includes a load curve, and the step of performing dynamic simulation based on the test data through a pre-established simulation virtual model to output dynamic characteristic parameters and the load curve includes:

[0025] Based on the driving force applied to the rigid-flexible coupling simulation virtual model, starting the dynamic simulation function of the rigid-flexible coupling simulation virtual model;

[0026] According to the dynamic simulation function of the rigid-flexible coupling simulation virtual model, the load curve is compared with the original dynamic characteristic parameters in the rigid-flexible coupling simulation virtual model to obtain a comparison result, and the rigid-flexible coupling simulation virtual model is debugged based on the comparison result to obtain a simulation virtual model for accuracy verification;

[0027] The precision-verified simulation virtual model is used to output dynamic characteristic parameters and load curves.

[0028] In one embodiment, the step of comparing the load curve with the original dynamic characteristic parameters in the rigid-flexible coupling simulation virtual model to obtain a comparison result, and debugging the rigid-flexible coupling simulation virtual model based on the comparison result to obtain the simulation virtual model for accuracy verification includes:

[0029] Determine whether the original dynamic characteristic parameters in the rigid-flexible coupling simulation virtual model are consistent with the load curve;

[0030] If they are inconsistent, a sensitivity analysis is performed on the friction coefficients of key components in the flexible coupling simulation virtual model using the experimental design DOE technology to obtain the optimal friction coefficient;

[0031] Based on the optimal friction coefficient, the rigid-flexible coupling simulation virtual model is debugged until a precision-verified simulation virtual model is obtained.

[0032] In addition, to achieve the above-mentioned purpose, the present application also proposes a dynamic simulation device, characterized in that the device comprises:

[0033] An acquisition module is used to acquire test data of key components;

[0034] The simulation module is used to perform dynamic simulation based on the test data through a pre-established simulation virtual model, and output dynamic characteristic parameters and load curves.

[0035] In addition, to achieve the above-mentioned purpose, the present application also proposes a dynamic simulation terminal device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the dynamic simulation method described above.

[0036] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the dynamic simulation method described above are implemented.

[0037] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the dynamic simulation method described above are implemented.

[0038] The embodiments of the present application provide a dynamic simulation method, apparatus, terminal device and storage medium, specifically to obtain the test data of key components; to model the key components to obtain a simulation virtual model; to perform dynamic simulation based on the test data through the simulation virtual model, and to output dynamic characteristic parameters and load curves. This solution can comprehensively obtain the performance of the injection molding machine and the die-casting machine under working conditions by dynamically simulating the injection molding machine and the die-casting machine and outputting the dynamic performance parameters of the equipment, so as to facilitate design engineers to quickly make modification and optimization decisions. Making full use of dynamic simulation technology is conducive to the product performance being in a leading position in the industry, and deepening the in-depth application of dynamic simulation technology will help to increase the speed of product development, reduce product development costs, and enhance product market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 A schematic diagram of a flow chart provided for the first embodiment of the dynamic simulation method of the present application;

[0042] Figure 2 A schematic diagram of the simulation virtual model accuracy debugging process provided in Example 1;

[0043] Figure 3 A schematic diagram of the damping system debugging process provided in Example 1;

[0044] Figure 4 A schematic diagram of a flow chart provided for the second embodiment of the dynamic simulation method of the present application;

[0045] Figure 5 A brief flowchart of the dynamic simulation method provided in Example 1 of the present application;

[0046] Figure 6 This is a schematic diagram of the module structure of the dynamic simulation device according to an embodiment of the present application;

[0047] Figure 7 A schematic diagram of the terminal device structure of the hardware operating environment involved in the dynamic simulation method in the embodiment of the present application.

[0048] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0050] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0051] The main solution of the embodiment of the present application is: to obtain the test data of key components in the injection molding machine and the die-casting machine; based on the test data, perform dynamic simulation through a pre-established simulation virtual model, and output dynamic characteristic parameters and load curves.

[0052] Due to the lack of dynamic simulation technology in product design in the current injection molding and die-casting machine industries, design engineers cannot obtain the dynamic performance parameters of their designed products and cannot effectively evaluate whether their products meet the design requirements, resulting in repeated abnormal problems in subsequent tests. Once a problem occurs, the design is returned to the design end for design changes, re-production and verification, which will seriously affect the speed of product development, waste a lot of R&D costs, and reduce product market competitiveness. Injection molding and die-casting machines are complex systems involving disciplines covering electromechanical and hydraulic multi-physics field technologies. At present, design engineers from different disciplines conduct design analysis in their own fields and cannot perform interdisciplinary joint design analysis, resulting in incompatibility between different disciplines in actual product application, various problems in product operation, and the system cannot reach the optimal state.

[0053] This application provides a solution, using the dynamic simulation technology of the simulation virtual model, establishing the simulation virtual model of the injection molding machine / die casting machine according to the relevant steps, and using the refined debugging and DOE technology to debug the accuracy and damping system of the simulation virtual model to ensure that the simulation results are basically consistent with the corresponding parameters of the physical prototype. The simulation virtual model can be used to accurately study the dynamic performance of the injection molding machine and the die casting machine, reproduce their working process, and obtain the system dynamic performance (including displacement curve, velocity and acceleration curve), the force and torque curve of the key components and the system damping system during their working process. With the help of the simulation virtual model, it can be evaluated whether the dynamic performance of the system meets the design requirements, whether the strength / stiffness / fatigue life of the key components meets the design requirements, so as to guide product design; its simulation virtual model can also be used to study the coupling effect of the three physical fields of the system, including mechanical, electrical and hydraulic, including mechanical system optimization, hydraulic system optimization and key hydraulic component energy-saving optimization, control system optimization and other contents.

[0054] It should be noted that the execution subject of this embodiment can be a computing service terminal device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic terminal device capable of realizing the above functions, etc. The following takes a personal computer as an example to illustrate this embodiment and the following embodiments.

[0055] Based on this, the embodiment of the present application provides a dynamic simulation method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the dynamic simulation method of the present application.

[0056] In this embodiment, the dynamic simulation method includes steps S10 to S20:

[0057] Step S10, obtaining test data of key components in the injection molding machine and the die-casting machine;

[0058] It should be noted that the key components of the injection molding machine and die casting machine include the head plate, second plate, tail plate, guide column, machine hinge shaft and steel sleeve of the injection molding machine and die casting machine. The test data includes stroke data and load curve.

[0059] In a feasible implementation, step S10 may include steps S11 to S12:

[0060] Step S11, recording the quality characteristics and initial positions of key components in the injection molding machine and the die casting machine;

[0061] It should be noted that quality characteristics refer to the physical properties and functional characteristics of key components of injection molding machines and die-casting machines, which are used to evaluate and control the performance and reliability of key components.

[0062] Optionally, the mass characteristics of the head plate, second plate, tail plate, guide column, machine hinge shaft and steel sleeve in the injection molding machine and die-casting machine and the initial positions of these key components in the installed state are recorded to provide data support for subsequent dynamic simulation and analysis.

[0063] Step S12, performing relevant tests on the corresponding physical prototype according to the quality characteristics of the key components and the initial positions, and acquiring test data of the key components.

[0064] Optionally, a detailed test plan is developed based on the quality characteristics and expected functional requirements of key components. The test plan is executed through the corresponding physical prototype to obtain test data of key components. Specifically, it is necessary to pay attention to the stroke data generated by the piston rod of the clamping cylinder during the opening and closing of the mold and the load curve of the clamping cylinder. These stroke data and load curves will be recorded as test data of key components.

[0065] Through the above steps, the test data of key components in the injection molding machine and the die-casting machine are obtained, which provides important data support for the subsequent dynamic simulation processing through the simulation virtual model.

[0066] Step S20: Perform dynamic simulation based on the test data through a pre-established simulation virtual model, and output dynamic characteristic parameters and load curves.

[0067] It should be noted that the test data includes stroke data, which in turn includes displacement and speed curves of the piston rod of the clamping cylinder. The test data also includes load curves.

[0068] It is worth noting that in the prior art, the injection molding machine and die-casting machine industries lack the application of dynamic simulation technology during product design, and thus are unable to obtain the dynamic performance parameters of the products. Therefore, by executing step S20, dynamic simulation can be performed through a pre-established simulation virtual model to obtain the corresponding dynamic performance parameters of the product, thereby achieving effective evaluation of the product.

[0069] Before executing step S20 "performing dynamic simulation according to the test data through a pre-established simulation virtual model to output dynamic characteristic parameters and load curves", step S201 is also included:

[0070] Step S201, modeling is performed according to key components to obtain a pre-established simulation virtual model.

[0071] It can be understood that in order to realize the application of dynamic simulation technology in the injection molding machine and the die-casting machine, therefore, step S201 is executed to obtain a simulation virtual model, and the simulation virtual model can be used for further dynamic simulation processing.

[0072] In a feasible implementation, step S201 may include steps A11 to A14:

[0073] Step A11, simplifying the computer-aided design (CAD) model in the injection molding machine and / or the die-casting machine according to the measured positions of the key components, and exporting the simplified CAD model in an intermediate format;

[0074] It should be noted that the CAD model (Computer-Aided Design Model) is used to represent the geometric shape and structure of an object or component.

[0075] Optionally, the CAD model in the injection molding machine and / or die casting machine is simplified, and the clamping system, injection system and key mechanical components of the frame are retained, and the hydraulic and control components are omitted. And the CAD model in the injection molding machine / die casting machine is adjusted according to the measured positions of the key components. Combining the above steps of simplifying and adjusting the CAD model, a simplified CAD model is obtained, and the simplified CAD model is exported in an intermediate format, such as X_T, STP format, so that the simplified CAD model can be read in the subsequent dynamic simulation software.

[0076] Among them, X_T is a universal 3D data exchange format that is widely supported; STP is an ISO standard exchange format that supports advanced geometric information.

[0077] Step A12, assigning material parameters and corresponding performance parameters to key components in the simplified CAD model through a dynamic simulation function, to obtain a CAD model with perfect characteristic attributes;

[0078] It should be noted that material parameters include but are not limited to density, elastic modulus, yield strength, fracture degree, thermal expansion coefficient, etc. of key components.

[0079] Performance parameters include but are not limited to the mass, moment of inertia, stiffness, damping system, friction coefficient, etc. of key components.

[0080] Optionally, the simplified CAD model is imported into the dynamics simulation software, while ensuring the completeness of the key components in the simplified CAD model. The key components in the simplified CAD model are given corresponding material parameters and corresponding performance parameters to ensure that the quality characteristics of the key components of the system are consistent with the quality characteristics of the actual test, and finally a CAD model with complete characteristic attributes is obtained.

[0081] Step A13, establishing constraint relationships between key components;

[0082] Optionally, after obtaining a CAD model with perfect feature attributes, a constraint relationship between its key components is established, that is, the key components are rigidified, including fixed constraints, contact constraints and rotation constraints, to ensure that the motion relationship of the subsequent simulation virtual model is consistent with the actual product motion relationship.

[0083] Among them, fixed constraints refer to limiting the freedom of key components in certain directions, such as completely fixing a key component so that it cannot move or rotate. In the dynamic simulation process, fixed constraints are usually used to simulate the base or other key components that will not move, ensuring that they remain stationary during the dynamic simulation process;

[0084] Contact constraints refer to the simulation of the interaction between two or more key components on the contact surface, including collision detection, friction effects, etc. In the dynamic simulation process, contact constraints are used to simulate the physical contact between key components to ensure that they interact according to the actual contact situation, such as simulating the contact between the clamping cylinder piston rod and the mold;

[0085] Rotational constraints are constraints that limit or allow key components to rotate around a certain axis. In dynamic simulation, rotational constraints are used to simulate the rotational motion of shaft components, such as the rotational motion of the piston rod of the clamping cylinder during the opening and closing of the mold.

[0086] By reasonably setting the above constraints, rigid key components are obtained to ensure that the movement of key components in the simulation system matches the movement of components in the actual product, so as to improve the accuracy and credibility of the simulation.

[0087] Step A14, based on the CAD model with perfected characteristic attributes and the constraint relationship between key components, the key components are flexibly processed by using the modal synthesis method to form a rigid-flexible coupled simulation virtual model.

[0088] It should be noted that the rigid-flexible coupling simulation virtual model refers to a model that combines rigid components with flexible components. This model can more accurately simulate the dynamic behavior of the actual mechanical system, which is especially important when it is necessary to consider the deformation of the components under load.

[0089] In addition, it should be noted that the modal synthesis method adopts the Craig-Bampton fixed interface modal synthesis method.

[0090] In a feasible implementation, step A14 may include steps A141 to A145:

[0091] Step A141, using the CAD model with perfected feature attributes and the constraint relationship between key components, the degrees of freedom of each interface of the key components are fixed to establish the connection between the key components;

[0092] Optionally, a CAD model with perfect feature attributes is loaded into the dynamics simulation software, and for the interface between key components, it is determined which degrees of freedom need to be fixed. For example, at the contact interface, the translational degrees of freedom and the rotational degrees of freedom can be fixed to simulate the actual contact constraints. And the connection between the key components is established based on the defined constraint relationship and the fixed degrees of freedom.

[0093] Step A142, based on the connection between the key components, calculate the low-order main modal set and the constraint modal set of the key components, delete the high-order main modal set and reduce the main modal set, retain the main modal of the preset order, and establish the key components of the flexible body based on the main modal of the preset order;

[0094] It should be noted that low-order main mode sets refer to the modes of the structure at lower frequencies, which usually correspond to the main vibration modes of the structure. Calculating low-order main mode sets helps to understand the basic vibration characteristics of the structure.

[0095] The constrained mode set refers to the modes of the structure after considering the connection constraints between key components. The constrained mode set can reveal the vibration characteristics of the structure under actual working conditions.

[0096] Optionally, in this embodiment, firstly, the low-order main mode set [Φ Ik ] and the constrained mode set [Ψ c ]:

[0097] By ([K II ]-ω 2 [M II ])={0}, determine the low-order main mode set [Φ Ik ];

[0098] Among them, K represents stiffness, M represents mass, ω represents angular velocity, I represents internal degrees of freedom, J represents interface degrees of freedom, [K II ] represents the stiffness matrix of the rigid body, [M II ] represents the mass matrix of the rigid body.

[0099] Depend on Determine the constraint mode set [Ψ c ];

[0100] Where I represents the internal degree of freedom, J represents the interface degree of freedom, and I JJ is the inertia of the interface degrees of freedom, [K II ] represents the stiffness of the internal degrees of freedom, [K IJ ] represents the stiffness of the interface degree of freedom, Ψ IJ is the flexibility matrix of the flexible body in the constrained modal coordinates.

[0101] Then, since the complete modal set may be very large and contain many high-frequency modes that have little effect on the overall dynamic characteristics of the system, it is usually chosen to retain the first k-order main modes and ignore other high-order modes, which is beneficial to reduce the computational complexity while still capturing the main dynamic characteristics of the system.

[0102] Step A143, establishing the motion equation of the key component of the flexible body in the corresponding mode and the motion equation in the overall coordinates;

[0103] After retaining the preset k-order main mode, the flexibility matrix and mass matrix of the flexible body component can be converted to the modal coordinates, thereby establishing the motion equation of the flexible body component in its modal coordinates:

[0104]

[0105] Among them, u represents the displacement vector of the entire system, including all degrees of freedom of the flexible body with rigidity, and u I Represents the displacement of the internal freedom of the component, u J represents the displacement of the degree of freedom of the component interface, Φ represents the main mode matrix, Φ k represents the k-th main mode vibration vector of the flexible body, Ψ c Represents a constraint relationship, p k represents the modal coordinate component of the kth main mode of the soft body, p c Represents the modal coordinate vector of the soft body.

[0106] At the same time, coordinate transformation is performed according to the following formula to establish the motion equation of each flexible body component in the overall coordinate:

[0107]

[0108] in, represents the mass matrix, represents the stiffness matrix, [f] represents the frequency matrix, represents the external force vector of the system, Φ represents the main mode matrix, [K II ] represents the stiffness matrix of the rigid body, [M II ] represents the mass matrix of the rigid body, u represents the displacement vector of the system, represents the velocity vector of the system.

[0109] Step A145, according to the motion equation of the key flexible body component in the corresponding mode and the motion equation in the overall coordinate, the substructure mass and stiffness matrix of each flexible body component and rigid body component are integrated to obtain a rigid-flexible coupling simulation virtual model.

[0110] Optionally, the substructure mass of each flexible body component and rigid body component, the substructure mass of the rigid body component, and the stiffness matrix in the simulation system can be integrated to establish the rigid-flexible coupled multibody dynamics equation:

[0111]

[0112] Where [M], [C], and [K] are the overall mass, damping, and stiffness matrices of the simulation system, respectively; {F} is the external load of the simulation system. and {q} are the overall acceleration, velocity, and displacement matrices of the simulation system, respectively.

[0113] Finally, by substituting the integrated mass and stiffness matrix into the overall motion equation, a complete model including rigid and flexible body components is formed, namely, a rigid-flexible coupled simulation virtual model.

[0114] Based on step S201, step S20 may include steps S21 to S23:

[0115] Step S21, based on the driving force applied to the rigid-flexible coupling simulation virtual model, starting the dynamic simulation function of the rigid-flexible coupling simulation virtual model;

[0116] Optionally, by applying a driving force to the simulation virtual model, a dynamic simulation function in the simulation virtual model is activated to simulate the dynamic behavior of the rigid-flexible coupling system.

[0117] Step S22, according to the dynamic simulation function of the rigid-flexible coupling simulation virtual model, comparing the load curve with the original dynamic characteristic parameters in the rigid-flexible coupling simulation virtual model to obtain a comparison result, and debugging the rigid-flexible coupling simulation virtual model based on the comparison result to obtain a simulation virtual model for accuracy verification;

[0118] It should be noted that the original dynamic characteristic parameters in the rigid-flexible coupling simulation virtual model include but are not limited to mass, stiffness, damping system, displacement, force, angular velocity, etc.

[0119] The simulation virtual model of rigid-flexible coupling includes dynamic simulation model and finite element simulation model.

[0120] Optionally, after starting the dynamic simulation function of the rigid-flexible coupled simulation virtual model, the load curve in the travel data is compared with the original dynamic characteristic parameters in the simulation virtual model to debug the model accuracy and ensure the accuracy of the simulation virtual model.

[0121] Please refer to Figure 2 , Figure 2 Schematic diagram of the simulation virtual model accuracy debugging process.

[0122] Specifically, first, the stroke data of the test data is input into the dynamics simulation model, and the dynamics simulation model is used to perform dynamic simulation and output the load-force curve. The load-force curve output by the dynamics simulation model is subjected to error analysis with the load curve (including force data) in the test data. If the analysis result shows that the load-force curve output by the dynamics simulation model is inconsistent with the force data in the test data, the dynamics simulation model is corrected; if the analysis result shows that the load-force curve output by the dynamics simulation model is consistent with the load curve in the test data, the stress-strain is output through the finite element simulation model, and the stress-strain output by the finite element simulation model is subjected to error analysis with the load curve (including stress-strain) in the test data. If the analysis result shows that the stress-strain output by the finite element simulation model is inconsistent with the stress-strain in the test data, the finite element simulation model is corrected; if the analysis result shows that the stress-strain output by the finite element simulation model is consistent with the stress-strain in the test data, the finite element simulation model is corrected; if the analysis result shows that the stress-strain output by the finite element simulation model is consistent with the stress-strain in the test data, it means that a simulation virtual model with a more accurate simulation effect is obtained.

[0123] In the process of debugging the accuracy of the simulation virtual model, for the correction of the simulation virtual model, this embodiment proposes a system damping system debugging method, that is, using DOE (Design of Experiments) technology to perform sensitivity analysis on the friction coefficient of key components, obtain the optimal friction coefficient value, and ensure that the error between the simulation force curve and the test force curve of the locking cylinder piston rod meets the set requirements.

[0124] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the damping system debugging process.

[0125] Specifically, first, identify the damping initial error output in the system, then identify which design variables will affect the damping system, and determine the reasonable value range of the design variables to ensure that the system can work within a reasonable range, and set one or more analysis objective functions to measure the performance of the system. Then, according to the set analysis objective function, use DOE technology to analyze and output the sensitivity diagram of the design variables to show the degree of influence of the design variables on the system performance. Then, based on the results of the design variable sensitivity diagram, redefine the design variables to reduce the influence of the damping system. Then, based on the new design variables, redefine the constraints of the system. Based on the new design variables and constraints, redefine the optimization objectives and scope. And according to the size of the design error, set the number of cycles required for the optimization algorithm. Finally, output the result that meets the optimization goal requirements, that is, the optimal friction coefficient. Based on the optimal friction coefficient, the simulation virtual model is repeatedly debugged until a simulation virtual model with accuracy verification is obtained.

[0126] Step S23: outputting dynamic characteristic parameters and load curves using the precision-verified simulation virtual model.

[0127] It should be noted that the dynamic characteristic parameters include but are not limited to the displacement, velocity and acceleration curves of key components. The load curves include but are not limited to the output power or torque curve of the power source, the stress and strain curves of key components, the load distribution curve of the system, and the vibration response curve.

[0128] Optionally, after obtaining the precision-verified simulation virtual model through the above step S22, the precision-verified simulation virtual model is used to output dynamic characteristic parameters and load curves. Among them, the output dynamic characteristic parameters are used to evaluate whether the performance parameters of key components meet the design requirements (the evaluation criteria can refer to the injection molding machine / die casting machine product design specification requirements), and to guide the subsequent system performance optimization. The load curve is used as the load input for the structural simulation of key components, calculates the dynamic stress strain of key components, evaluates whether the strength, stiffness and fatigue life of key components meet the design requirements (the strength, stiffness and fatigue life evaluation criteria can refer to the injection molding machine / die casting machine product design specifications, and can also refer to the standards in the simulation industry), and guides the modification and optimization of subsequent key components.

[0129] In addition, subsequent lightweight designs such as topology optimization and shape optimization can also be performed on the precision-verified virtual prototype:

[0130] When performing topology optimization, the static analysis governing equations are used:

[0131] KU=F

[0132] The objective function is to minimize the structural flexibility:

[0133]

[0134] Using volume as a constraint:

[0135] Where x is the density of each unit, N is the total number of units, F, U, K are the overall load matrix, displacement matrix and overall stiffness matrix respectively, u and k are the unit displacement matrix and unit stiffness matrix respectively; f is the volume coefficient; V(x) and V 0 are the optimized material volume and initial material volume respectively; p is the penalty factor, which is generally 3.

[0136] By performing lightweight design on a precision-verified virtual prototype, product costs can be saved and a structural solution that meets product performance and uses the lowest cost can be achieved.

[0137] Through the above-mentioned embodiment method, specifically, the test data of key components in the injection molding machine and the die-casting machine are obtained; according to the test data, dynamic simulation is performed through a pre-established simulation virtual model, and dynamic characteristic parameters and load curves are output. This solution can output the dynamic performance parameters of the equipment by dynamically simulating the injection molding machine and the die-casting machine, and can comprehensively obtain the performance of the injection molding machine and the die-casting machine under working conditions. In order to quickly evaluate whether its design meets the requirements, the competitive status of similar products in the industry is good through good indicators, which facilitates design engineers to quickly make modifications and optimization decisions. Making full use of dynamic simulation technology is conducive to product performance being in a leading position in the industry. Deepening the in-depth application of dynamic simulation technology will help to increase the speed of product development, reduce product development costs, and enhance product market competitiveness.

[0138] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 4 After step S201, the dynamic simulation method further includes steps B11 to B12:

[0139] Step B11, using the clamping cylinder piston rod in the rigid-flexible coupling simulation virtual model as a driving component of the rigid-flexible coupling simulation virtual model;

[0140] It should be noted that the locking cylinder piston rod is a hydraulic actuator, which is commonly used in industrial equipment such as injection molding machines, die-casting machines, etc., to provide a strong thrust to complete the action of locking the mold.

[0141] Optionally, in this embodiment, using the clamping cylinder piston rod in the rigid-flexible coupling simulation virtual model as the driving component of the rigid-flexible coupling simulation virtual model means that during the dynamic simulation process, the clamping cylinder piston rod is regarded as the main driving force source of the system.

[0142] Step B12, inputting the displacement and speed curve of the clamping cylinder piston rod into the clamping cylinder piston rod to apply driving force to the rigid-flexible coupling simulation virtual model.

[0143] Optionally, the displacement and speed curve of the clamping cylinder piston rod in the stroke data is input into the driving component, i.e., the clamping cylinder piston rod, to start the simulation virtual model and let the simulation virtual model run according to the set time step. During the debugging system movement, by simulating the movement of the clamping cylinder piston rod, it is ensured that the error between the simulation force curve of the clamping cylinder piston rod and the test force curve meets the set requirements.

[0144] Through the above-mentioned embodiment method, that is, by inputting the actual motion curve of the clamping cylinder piston rod into the simulation model, the situation in the real world can be simulated more accurately, making the simulation result closer to the performance of the actual system.

[0145] For example, in order to help understand the implementation process of the dynamic simulation method obtained by combining this embodiment with the above-mentioned embodiment 1, please refer to Figure 5 , Figure 5 A brief flow chart of a dynamic simulation method is provided, specifically:

[0146] First, the test data preparation stage is carried out to record the quality characteristics and initial positions of key components in the injection molding machine and the die-casting machine; then relevant tests are carried out on the corresponding physical prototypes, including the stroke data of the clamping cylinder piston rod during the opening and closing process and the load curve of the clamping cylinder.

[0147] Then, the CAD models of the injection molding machine and die casting machine are simplified, retaining the clamping system, injection system and key mechanical components of the frame, omitting the hydraulic and control components. The simplified CAD models are then imported into the dynamics simulation software to assign the material types and corresponding performance parameters of the key components of the injection molding machine and die casting machine.

[0148] Next, the constraint relationship between key components is established, and the key components are made flexible using the modal synthesis method to form a rigid-flexible coupling virtual simulation model.

[0149] Under the premise of applying driving force to the rigid-flexible coupling virtual simulation model, dynamic simulation is carried out through the rigid-flexible coupling virtual simulation model. The dynamic simulation includes system damping coefficient debugging. The system damping coefficient debugging uses DOE technology to perform sensitivity analysis on the friction coefficient of the second plate, tail plate, frame and hinge components to obtain the optimal friction coefficient value. The rigid-flexible coupling virtual simulation model is repeatedly corrected using the optimal friction coefficient value to finally obtain a simulation virtual model with accuracy verification.

[0150] Finally, the system dynamic characteristic parameters and the stress curves of key components are output through the precision-verified simulation virtual model. Lightweight design such as product topology optimization and shape optimization can also be performed on the precision-verified simulation virtual model, thereby saving product costs and achieving a structural solution that meets product performance and uses the lowest cost.

[0151] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the dynamic simulation method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0152] This application also provides a dynamic simulation device, please refer to Figure 6 , the dynamic simulation device comprises:

[0153] An acquisition module 10 is used to acquire test data of key components in an injection molding machine and a die-casting machine;

[0154] The simulation module 20 is used to perform dynamic simulation according to the test data through a pre-established simulation virtual model, and output dynamic characteristic parameters and load curves.

[0155] The dynamic simulation device provided by the present application adopts the dynamic simulation method in the above embodiment, which can solve the technical problem of how to effectively apply dynamic simulation technology when using injection molding machines and die-casting machines for product design. Compared with the prior art, the beneficial effects of the dynamic simulation device provided by the present application are the same as the beneficial effects of the dynamic simulation method provided by the above embodiment, and other technical features in the dynamic simulation device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0156] The present application provides a dynamic simulation terminal device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the dynamic simulation method in the above-mentioned embodiment one.

[0157] Reference below Figure 7 , which shows a schematic diagram of the structure of a dynamic simulation terminal device suitable for implementing the embodiment of the present application. The dynamic simulation terminal device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The dynamic simulation terminal device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0158] like Figure 7As shown, the dynamic simulation terminal device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the dynamic simulation terminal device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the dynamic simulation terminal device to communicate wirelessly or wired with other terminal devices to exchange data. Although the figure shows a dynamic simulation terminal device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or less systems can be implemented or have alternatively.

[0159] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0160] The dynamic simulation terminal device provided by the present application adopts the dynamic simulation method in the above embodiment, which can solve the technical problem of how to effectively apply the dynamic simulation technology when using injection molding machines and die-casting machines for product design. Compared with the prior art, the beneficial effects of the dynamic simulation terminal device provided by the present application are the same as the beneficial effects of the dynamic simulation method provided by the above embodiment, and the other technical features in the dynamic simulation terminal device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0161] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0162] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0163] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the dynamic simulation method in the above-mentioned embodiment.

[0164] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0165] The computer-readable storage medium may be included in the dynamic simulation terminal device; or may exist independently without being assembled into the dynamic simulation terminal device.

[0166] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the dynamic simulation terminal device, the dynamic simulation terminal device: obtains the test data of key components in the injection molding machine and the die-casting machine; performs dynamic simulation through a pre-established simulation virtual model based on the test data, and outputs dynamic characteristic parameters and load curves.

[0167] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0168] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0169] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0170] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned dynamic simulation method, and can solve the technical problem of how to effectively apply dynamic simulation technology when using injection molding machines and die-casting machines for product design. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the dynamic simulation method provided by the above-mentioned embodiment, and will not be elaborated here.

[0171] The present application also provides a computer program product, including a computer program, which implements the steps of the dynamic simulation method as described above when executed by a processor.

[0172] The computer program product provided by the present application can solve the technical problem of how to effectively apply dynamic simulation technology when using injection molding machines and die-casting machines for product design. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the dynamic simulation method provided by the above embodiment, which will not be repeated here.

[0173] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A dynamic simulation method, characterized in that: The method comprises: Obtain test data of key components in injection molding and die casting machines; According to the test data, dynamic simulation is performed through a pre-established simulation virtual model to output dynamic characteristic parameters and load curves.

2. The method according to claim 1, characterized in that The step of obtaining test data of key components in the injection molding machine and the die casting machine includes: Recording of quality characteristics and initial positions of key components in injection molding and die casting machines; According to the quality characteristics of the key components and the initial positions, relevant tests are performed on corresponding physical prototypes to obtain test data of the key components.

3. The method according to claim 1, characterized in that Before the step of performing dynamic simulation according to the test data through a pre-established simulation virtual model to output dynamic characteristic parameters and load curves, the method further includes: performing modeling according to key components to obtain a pre-established simulation virtual model.

4. The method according to claim 3, characterized in that The step of modeling the key components to obtain a pre-established simulation virtual model includes: Simplify the computer-aided design (CAD) model in the injection molding machine and / or die-casting machine based on the measured positions of key components, and export the simplified CAD model in an intermediate format; By using the dynamic simulation function, material parameters and corresponding performance parameters are assigned to the key components in the simplified CAD model to obtain a CAD model with perfect characteristic attributes; Establish constraint relationships between key components; Based on the CAD model with perfect characteristic attributes and the constraint relationship between key components, the key components are flexibly processed using the modal synthesis method to form a rigid-flexible coupled simulation virtual model, which is a pre-established simulation virtual model.

5. The method according to claim 4, characterized in that The steps of performing flexible processing on the key components by using the modal synthesis method based on the improved CAD model of the characteristic attributes and the constraint relationship between the key components to form a rigid-flexible coupling simulation virtual model include: Using the CAD model with perfect feature attributes and the constraint relationship between key components, the degrees of freedom of each interface of the key components are fixed to establish the connection between the key components; Based on the connection between the key components, the low-order main modal set and the constraint modal set of the key components are calculated, the high-order main modal set is deleted and the main modal set is reduced, the main modal of the preset order is retained, and the key components of the flexible body are established based on the main modal of the preset order; Establishing the motion equations of the key components of the flexible body in the corresponding modes and the motion equations in the overall coordinates; According to the motion equations of the key flexible body components in the corresponding modes and the motion equations in the overall coordinates, the substructure mass and stiffness matrix of each flexible body component and rigid body component are integrated to obtain a rigid-flexible coupling simulation virtual model.

6. The method according to claim 3, characterized in that The test data includes stroke data, and the stroke data includes displacement and speed curve of the piston rod of the clamping cylinder. After the step of modeling the key components to obtain the pre-established simulation virtual model, the method further includes: Using the clamping cylinder piston rod in the rigid-flexible coupling simulation virtual model as a driving component of the rigid-flexible coupling simulation virtual model; The displacement and speed curve of the clamping cylinder piston rod are input into the clamping cylinder piston rod to apply a driving force to the rigid-flexible coupled simulation virtual model.

7. The method according to any one of claims 5 to 6, characterized in that: The test data includes a load curve, and the step of performing dynamic simulation based on the test data through a pre-established simulation virtual model to output dynamic characteristic parameters and the load curve includes: Based on the driving force applied to the rigid-flexible coupling simulation virtual model, starting the dynamic simulation function of the rigid-flexible coupling simulation virtual model; According to the dynamic simulation function of the rigid-flexible coupling simulation virtual model, the load curve is compared with the original dynamic characteristic parameters in the rigid-flexible coupling simulation virtual model to obtain a comparison result, and the rigid-flexible coupling simulation virtual model is debugged based on the comparison result to obtain a simulation virtual model for accuracy verification; The precision-verified simulation virtual model is used to output dynamic characteristic parameters and load curves.

8. The method according to claim 7, characterized in that The step of comparing the load curve with the original dynamic characteristic parameters in the rigid-flexible coupling simulation virtual model to obtain a comparison result, and debugging the rigid-flexible coupling simulation virtual model based on the comparison result to obtain the simulation virtual model for accuracy verification includes: Determine whether the original dynamic characteristic parameters in the rigid-flexible coupling simulation virtual model are consistent with the load curve; If they are inconsistent, a sensitivity analysis is performed on the friction coefficients of key components in the flexible coupling simulation virtual model using the experimental design DOE technology to obtain the optimal friction coefficient; Based on the optimal friction coefficient, the rigid-flexible coupling simulation virtual model is debugged until a precision-verified simulation virtual model is obtained.

9. A dynamic simulation device, characterized in that: The device comprises: Acquisition module, used to acquire test data of key components in injection molding machines and die-casting machines; The simulation module is used to perform dynamic simulation based on the test data through a pre-established simulation virtual model, and output dynamic characteristic parameters and load curves.

10. A dynamic simulation terminal device, characterized in that: The terminal device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the dynamic simulation method according to any one of claims 1 to 8.

11. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the dynamic simulation method according to any one of claims 1 to 8 are implemented.

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