Injection molding machine toggle connecting rod mechanism arrangement determination method and system and storage medium

Abstract

The invention relates to an injection molding machine toggle connecting rod mechanism arrangement determination method and system and a storage medium, and the method comprises the steps: obtaining the structure parameter information of a toggle connecting rod mechanism based on a preset mathematical model of the toggle connecting rod mechanism; according to the structure parameter information, a parameterized model is obtained through a preset parameter modeling method; according to the parameterized model, the maximum stress of a tail plate of the toggle connecting rod mechanism and the deformation quantity of a two-plate large plane in the mode locking direction are obtained through a preset stress and deformation analysis method; according to the maximum stress and the deformation quantity, an optimized parameter optimization model is obtained through a preset response surface optimization method; and outputting an arrangement scheme of the toggle connecting rod mechanism according to the optimized parameter model. According to the scheme, the toggle connecting rod mechanism is optimally designed, under the condition that the mass is kept unchanged, the maximum deformation of the large plane of the two plates in the mold locking direction is greatly reduced compared with that before optimization, the rigidity is greatly improved, and the performance of the toggle connecting rod mechanism is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of injection molding machines, and in particular to a method, system and storage medium for determining the arrangement of a toggle link mechanism of an injection molding machine. Background Art

[0002] As an important part of the plastics industry, injection molding machines have always been in a dominant position in the plastic molding equipment industry. In the context of the new industrialization process, how to improve injection molding machines has become a core issue explored by major companies.

[0003] As the core component of the three-plate machine, the structural optimization of the toggle connecting rod mechanism, especially the optimization of the connecting rod thickness, bracket thickness and arrangement, is of great significance to improving the performance and safety of the mold parts of the injection molding machine. In the prior art, the connecting rod parameters before optimization are determined and used based on experience, without specific stress and deformation data; in the new design, the selective changes and optimizations are completely based on the feedback of the actual operation of the machine and based on experience, among which the consideration of maximum stress and deformation accounts for a small proportion; the selection of connecting rod thickness and bracket thickness mainly relies on manual calculation of shear stress verification, without considering the specific relationship and interaction between the connecting rod and the bracket. Therefore, the optimization parameters of the toggle connecting rod mechanism obtained are inaccurate, lack of systematic theoretical basis, and need to be improved. Summary of the invention

[0004] In order to improve the accuracy of the optimization parameters of a toggle linkage mechanism, the present invention provides a method, a system and a storage medium for determining the arrangement of a toggle linkage mechanism of an injection molding machine.

[0005] In a first aspect, the present invention provides a method for determining the arrangement of a toggle link mechanism of an injection molding machine, which adopts the following technical solution:

[0006] A method for determining the arrangement of a toggle link mechanism of an injection molding machine, comprising:

[0007] Based on a preset mathematical model of the toggle link mechanism, obtaining structural parameter information of the toggle link mechanism;

[0008] A parameterized model is obtained according to the structural parameter information by a preset parameter modeling method;

[0009] According to the parameterized model, the maximum stress of the tail plate of the toggle linkage mechanism and the deformation of the large plane of the two plates in the clamping direction are obtained by using the preset stress and deformation analysis method;

[0010] According to the maximum stress and deformation, the optimized parameter model is obtained by using the preset response surface optimization method;

[0011] Output the toggle linkage mechanism arrangement plan based on the optimized parameter model.

[0012] By adopting the above technical solution, in the prior art, when improving and optimizing the mechanism, the model needs to be modified and then re-imported into the analysis software each time. Now, by utilizing the parametric modeling method, the modeling software and the analysis software are linked, and the parts can be changed directly through parameters in the analysis software, making the whole process more direct and convenient, greatly shortening the working time, and improving the repeatability and fault tolerance of the optimization process.

[0013] At present, the optimization of part structure is mainly achieved by changing the structure of the part itself. In this scheme, the response surface optimization method is used to optimize the size of the existing part structure. The purpose of improving strength can be achieved by changing some structural dimensions without changing the part structure.

[0014] Moreover, the program is basically completed by computer, which greatly improves the optimization efficiency and accuracy, and provides a reliable basis for subsequent customer purchases.

[0015] Optionally, the parameter modeling method includes:

[0016] Matching the structural parameter information with a preset product database to determine fixed dimension information of the toggle link mechanism;

[0017] Analyze the structural parameter information and the preset associated database to determine the parameter independent variable information;

[0018] Determine parameter dependent variable information according to fixed size information and parameter independent variable information;

[0019] A parametric model is obtained according to fixed dimension information, parameter independent variable information, parameter dependent variable information and a preset generation database, and the parametric model is output.

[0020] Optionally, the stress and deformation analysis method includes:

[0021] Determine static performance parameters according to preset injection molding machine information and preset simulation database, the static performance parameters including material information, contact information, load information and position constraint information;

[0022] Matching the parameterized model with a preset grid processing database to obtain model gridding information;

[0023] Based on the preset solution results and preset boundary conditions, the maximum stress and deformation are output according to the model meshing information and static performance parameters.

[0024] Optionally, the boundary condition is obtained by a boundary condition setting method, and the boundary condition setting method includes:

[0025] According to the information of the injection molding machine, the contact between the front connecting rod and the second plate bracket, the rear connecting rod and the tail plate, the small connecting rod and the rear connecting rod, and the small connecting rod and the thrust seat are defined as frictionless contact, and the remaining friction is defined as sliding friction;

[0026] The minimum mold loading and clamping force is obtained according to the injection molding machine information, and the loading and clamping force is defined as the clamping force condition;

[0027] According to the information of the injection molding machine, the outer position of the tail plate tie rod hole and the thrust seat position during the clamping process are determined and defined as distance constraints;

[0028] Output boundary conditions based on frictionless contact, sliding friction, clamping force conditions, and distance constraints.

[0029] Optionally, the response surface optimization method comprises:

[0030] The maximum stress of the tail plate and the deformation of the large plane of the second plate in the clamping direction are defined as the optimization targets;

[0031] Define parameter independent variable information as optimization variables;

[0032] Based on the preset constraints, control the increase or decrease of optimization variables to output a set of optimization results;

[0033] Selecting the optimized deformation variable with the smallest value from the set of optimized deformation variables;

[0034] Determine whether to continue optimization or output optimization results based on the comparison between optimization results and optimization targets;

[0035] Match the corresponding fixed size information, parameter independent variable information and parameter dependent variable information according to the optimization result;

[0036] The optimized parameter model is outputted according to the fixed dimension information, the parameter independent variable information and the parameter dependent variable information.

[0037] Optionally, the mathematical model is obtained by a method for establishing a mathematical model, and the method for establishing a mathematical model includes:

[0038] Obtaining dimension parameter information of the injection molding machine according to preset injection molding machine information;

[0039] Obtain variable parameters, fixed parameters, constraints and objective functions according to the size parameter information;

[0040] The thickness of the front link and the thickness of the rear link are defined as variable parameters;

[0041] The gaps between the second plate and the front and rear connecting rods, the gaps between the tail plate bracket and the front and rear connecting rods, the gaps between the small connecting rod and the thrust seat, and the gaps between the small connecting rod and the three-eye rear connecting rod are defined as fixed parameters;

[0042] The width of the connecting rod bracket, the width of the second plate bracket, the width of the tail plate bracket and the width of the thrust seat bracket are defined as constraint conditions;

[0043] The maximum stress of the tail plate and the deformation of the large plane of the two plates in the direction of the clamping axis are defined as the objective function;

[0044] Output mathematical model based on variable parameters, fixed parameters, constraints and objective function.

[0045] Optionally, the objective type of the objective function is set to Minimize.

[0046] Optionally, the formula of the mathematical model is:

[0047]

[0048] Among them, fi is the maximum stress of the tail plate;

[0049] Δli--deformation of the two plates in the clamping direction;

[0050] B--front connecting rod thickness;

[0051] C--rear connecting rod thickness;

[0052] D--is a fixed value;

[0053] M--the sum of the thickness of the thrust seat bracket and the small connecting rod;

[0054] K--The sum of the thickness of the second plate bracket and the front connecting rod, and the sum of the thickness of the rear connecting rod bracket and the rear connecting rod.

[0055] In a second aspect, the present application provides a system for determining the arrangement of a toggle link mechanism of an injection molding machine, which adopts the following technical solution:

[0056] A system for determining the arrangement of a toggle link mechanism of an injection molding machine, comprising:

[0057] A generating unit, used for generating a parametric model of a toggle linkage mechanism of an injection molding machine;

[0058] The analysis unit is used to analyze the parameterized model generated by the generation unit to obtain the maximum stress of the tail plate and the deformation of the large plane of the second plate in the clamping direction;

[0059] A selection unit is used to select an optimization parameter model from numerous injection molding machine toggle linkage mechanisms within a preset setting range based on the maximum stress and deformation obtained by the analysis unit;

[0060] A determination unit, used for determining the injection molding machine toggle-link mechanism corresponding to the optimization parameter model selected by the selection unit as the optimal injection molding machine toggle-link mechanism required by the injection molding machine;

[0061] A memory for storing a program for determining a method for arranging a toggle link mechanism of an injection molding machine;

[0062] The program in the memory can be loaded and executed by the processor and realize a method for determining the arrangement of a toggle link mechanism of an injection molding machine.

[0063] By adopting the above technical solution, in the prior art, when improving and optimizing the mechanism, it is necessary to modify the model and then re-import it into the analysis software each time. Now, by utilizing the parametric modeling method, the modeling software and the analysis software are linked, and the parts can be changed directly through parameters in the analysis software, making the whole process more direct and convenient, greatly shortening the working time, and improving the repeatability and fault tolerance of the optimization process.

[0064] At present, the optimization of part structure is mainly achieved by changing the structure of the part itself. In this scheme, the response surface optimization method is used to optimize the size of the existing part structure. The purpose of improving strength can be achieved by changing some structural dimensions without changing the part structure.

[0065] Moreover, the program is basically completed by computer, which greatly improves the optimization efficiency and accuracy, and provides a reliable basis for subsequent customer purchases.

[0066] In a third aspect, the present application provides a computer storage medium capable of storing corresponding programs, which is characterized by being convenient for implementing a method for determining the arrangement of a toggle link mechanism of an injection molding machine, and adopts the following technical solution:

[0067] A computer-readable storage medium stores a computer program that can be loaded by a processor and execute any one of the above-mentioned methods for determining the arrangement of a toggle link mechanism of an injection molding machine.

[0068] In summary, the present application includes at least one of the following beneficial technical effects:

[0069] 1. In the past, each time a model was modified, it was necessary to re-modify the model and re-import it into the analysis software. Now, by using the parametric modeling method, the modeling software and the analysis software are linked, and parts can be changed directly through parameters in the analysis software, making the whole process more direct and convenient, greatly shortening the working time, and improving the repeatability and fault tolerance of the optimization process;

[0070] 2. Currently, the optimization of part structure is mainly achieved by changing the structure of the part itself. In this scheme, the response surface optimization method is used to optimize the size of the existing part structure. The purpose of improving strength can be achieved by changing the size of some structures without changing the part structure.

[0071] 3. Most of the work of this method is completed by computer, which greatly improves the optimization efficiency and accuracy, and provides a reliable basis for subsequent customer purchases. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 It is a method flow chart of a method for determining the arrangement of a toggle connecting rod mechanism of an injection molding machine according to an embodiment of the present invention.

[0073] Figure 2 It is a method flow chart of the parameter modeling method of an embodiment of the present invention.

[0074] Figure 3 It is a method flow chart of the stress and deformation analysis method according to an embodiment of the present invention.

[0075] Figure 4 It is a method flow chart of the response surface optimization method of an embodiment of the present invention. DETAILED DESCRIPTION

[0076] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0077] The embodiment of the present application discloses a method for determining the arrangement of a toggle link mechanism of an injection molding machine. By establishing a structural model of the toggle link mechanism, the model is imported into ANSYS software for meshing, and a finite element model of the toggle link mechanism is obtained; the finite element model of the toggle link mechanism is parameterized; the stress and strain analysis of the finite element model of the toggle link mechanism under load is performed; for the toggle link mechanism to be optimized, the maximum stress of the tail plate and the deformation of the large plane of the second plate in the clamping direction are set as optimization targets, and the optimization variables are adjusted under the set constraints and optimization targets to obtain an optimization candidate solution.

[0078] Reference Figure 1 A method for determining the arrangement of a toggle link mechanism of an injection molding machine comprises the following steps:

[0079] Step S100: Based on a preset mathematical model of the toggle link mechanism, structural parameter information of the toggle link mechanism is obtained.

[0080] Before optimizing the structure of the toggle link mechanism, it is necessary to establish a mathematical model for the toggle link mechanism, and the mathematical model is used to provide a theoretical reference for the structural optimization of the toggle link mechanism. The establishment of the mathematical model will not be described in detail here, but will be described in detail in the subsequent embodiments.

[0081] The structural parameter information refers to the structural dimensions that are required to be used in the structural optimization of the toggle linkage mechanism with reference to the mathematical model of the toggle linkage mechanism.

[0082] The structural parameter information of the toggle link mechanism can be obtained by querying the parameter information of a specific model of injection molding machine.

[0083] The mathematical model includes all the dimensional parameters required for the structural optimization of the toggle linkage mechanism. After the required dimensional parameters are determined, the specific dimensional information of the toggle linkage mechanism is obtained in a targeted manner.

[0084] Step S101: obtaining a parameterized model using a preset parameter modeling method according to structural parameter information.

[0085] The parameter modeling method refers to a method that can convert the structural parameter information of the toggle linkage into a three-dimensional model. The parameterized model includes all the structural parameter information of the toggle linkage. The parameter modeling method is not described here in detail, but will be described in detail in the subsequent embodiments.

[0086] By converting the structural parameter information of the toggle linkage into a visual three-dimensional model, the three-dimensional model can be analyzed in subsequent steps.

[0087] Step S102: obtaining the maximum stress of the tail plate of the toggle linkage mechanism and the deformation of the two plate large planes in the clamping direction according to the parameterized model using a preset stress and deformation analysis method.

[0088] The maximum stress of the tail plate and the deformation of the large plane of the two plates in the clamping direction are characteristic indicators used to measure the structural performance of the toggle linkage mechanism. The smaller the maximum stress of the tail plate and the smaller the deformation of the large plane of the two plates in the clamping direction, the higher the reliability of the toggle linkage mechanism.

[0089] The stress and deformation analysis method refers to a method that can simulate a specific parameterized model to obtain the maximum stress and deformation of the toggle linkage under specific conditions. The stress and deformation analysis method is not described here in detail, but will be described in detail in the subsequent embodiments.

[0090] After the parametric model is processed by stress and deformation analysis method to obtain the maximum stress and deformation, the parametric model can correspond to the maximum stress and deformation one by one. When the parameters in the parametric model change, the maximum stress and deformation will also change accordingly.

[0091] Step S103: obtaining an optimized optimization parameter model according to the maximum stress and deformation using a preset response surface optimization method.

[0092] The response surface optimization method refers to a method that can use the maximum stress and deformation as optimization targets to obtain the optimal solution of the parameterized model. The response surface optimization method will not be described in detail here, but will be described in detail in the subsequent embodiments.

[0093] After clarifying the relationship between the parameterized model and the maximum stress and deformation, the response surface optimization method is used. When the parameters in the parameterized model are changed, if the maximum stress and deformation are optimal, then the parameterized model corresponding to the maximum stress and deformation is the optimal solution, that is, the optimized parameter model.

[0094] Step S104: outputting a toggle linkage arrangement scheme according to the optimized parameter model.

[0095] After solving the optimization parameter model, the optimal arrangement of the toggle linkage mechanism can be obtained according to the data in the optimization parameter model, so as to improve the structural performance of the toggle linkage mechanism and improve the reliability.

[0096] Reference Figure 2 , the parametric modeling method includes the following steps:

[0097] Step S200: Matching the structural parameter information with a preset product database to determine the fixed dimension information of the toggle link mechanism.

[0098] The product database refers to a database containing structures with fixed dimensions in the toggle linkage mechanism of the injection molding machine, which is a database set by technicians and will not be described in detail here. By matching the structural parameter information of the injection molding machine with the product database, the fixed dimension information can be determined from the structural parameter information.

[0099] The fixed dimension information here mainly includes the gap between the second plate and the front and rear connecting rods, the gap between the tail plate bracket and the front and rear connecting rods, the gap between the small connecting rod and the thrust seat, and the gap between the small connecting rod and the three-eye rear connecting rod. The structural parameter information includes these fixed dimension information, and the fixed dimension information can be filtered out from the structural parameter information through the product database.

[0100] Step S201: Analyze the structural parameter information and the preset associated database to determine the parameter independent variable information.

[0101] The associative database refers to a database containing interrelated dimensions in the toggle linkage mechanism of the injection molding machine. It is a database set by technical personnel and will not be described in detail here.

[0102] The parameter independent variable information is one or more dimension information in the structural parameter information. Since the parameter independent variable information is interrelated with multiple other parameters in the toggle link mechanism of the injection molding machine, by changing the parameter independent variable information, other dimensions of the toggle link mechanism can be changed, thereby changing the overall structural performance of the toggle link mechanism.

[0103] By matching the structural parameter information with the associated database, the parameter independent variable information can be obtained. In this embodiment, the parameter independent variable information mainly refers to the size of the front connecting rod and the rear connecting rod.

[0104] Step S202: Determine parameter dependent variable information according to the fixed size information and the parameter independent variable information.

[0105] Parameter dependent variable information refers to the dimensional information in the toggle linkage mechanism of the injection molding machine that can change with the change of parameter independent variable information.

[0106] The parameter dependent variable information is associated with the fixed size information and the parameter independent variable information, and the parameter dependent variable information can be calculated through the fixed size information and the parameter independent variable information.

[0107] Step S203: Obtain a parameterized model according to the fixed size information, the parameter independent variable information, the parameter dependent variable information and a preset generation database, and output the parameterized model.

[0108] The generated database refers to a database that can be used to convert structural parameter information into a three-dimensional model. The database set for technicians will not be described in detail here.

[0109] The parametric model refers to a three-dimensional parameter model of the toggle linkage mechanism of the injection molding machine, and the dimensional information in the three-dimensional parameter model can be adjusted to make corresponding changes to the parametric model.

[0110] Structural parameter information mainly includes fixed size information, parameter independent variable information and parameter dependent variable information. Once the above three information are determined, they can be converted into a parametric model by generating a database. The parameter independent variable information and parameter dependent variable information in the parametric model are interrelated, so when the parameter independent variable information is changed, the parameter dependent variable information is also changed accordingly, causing the parametric model to change.

[0111] In this embodiment, the system can also complete the sketch modeling of the toggle link by using software tools such as CAD, UG and Solidworks, and correlate the fixed dimension information, parameter independent variable information and parameter strain variable information, and change only the set parameter independent variable information to make other parameter strain variable information change accordingly, thereby obtaining a parametric model.

[0112] Reference Figure 3 , the stress and deformation analysis method includes the following steps:

[0113] Step S300: determining static performance parameters according to preset injection molding machine information and a preset simulation database, wherein the static performance parameters include material information, contact information, load information, and position constraint information.

[0114] The injection molding machine information includes all the dimensions, materials, mechanical properties and other information of the injection molding machine.

[0115] The simulation database refers to a database containing parameters required for static simulation of a structure. The simulation database is a database set by a technician and will not be described in detail here.

[0116] By analyzing the injection molding machine information and the simulation database, the static performance parameters required for the static performance analysis of the toggle linkage mechanism of the injection molding machine can be obtained.

[0117] Step S301: matching the parameterized model with a preset grid processing database to obtain model gridding information.

[0118] The mesh processing database refers to the database used to mesh the three-dimensional model. It is a database set by technicians and will not be described here. After the parametric model is meshed, the parametric model can form countless independent model units, which is convenient for the subsequent static performance analysis of these model units. The model meshing information is the model information obtained after the parametric model is meshed.

[0119] Step S302: Based on the preset solution results and preset boundary conditions, the maximum stress and deformation are output according to the model meshing information and static performance parameters.

[0120] The solution result refers to the target direction to be output for the static performance analysis of the toggle linkage mechanism of the injection molding machine. The solution result is set manually when the system performs static performance analysis, so it will not be described here.

[0121] Boundary conditions refer to the limiting conditions set when performing static performance analysis on the toggle linkage mechanism of an injection molding machine. Boundary conditions are the conditions that the toggle linkage mechanism of an injection molding machine must meet when working normally.

[0122] The maximum stress and deformation are the output results required for the static performance analysis of the toggle linkage mechanism of the injection molding machine.

[0123] After determining the solution results and boundary conditions, static performance parameters are set based on the model meshing information and simulation analysis is performed to obtain the maximum stress and deformation. The method is: set the model meshing information according to the material information; set the contact relationship between parts in the model meshing information according to the contact information; apply loads to the model meshing information according to the load information, and the load information simulates the force applied to the normal operation of the elbow connecting rod mechanism of the injection molding machine; after setting the model meshing information according to the above parameters, each model unit of the elbow connecting rod mechanism of the injection molding machine in the model meshing information can produce corresponding deformation, and the maximum stress and deformation can be obtained after integrating all deformations.

[0124] The stress and deformation analysis method can also be used to solve the parametric model through ANSYS Workbench. The steps are: import the parametric model in the Static Structural module of ANSYS Workbench - define the material information of the parametric model - set the contact information - perform meshing - apply loads and constraints - add solution results - and finally solve to obtain the maximum stress and deformation.

[0125] The boundary condition setting method includes the following steps:

[0126] Step S400: According to the injection molding machine information, the contact between the front connecting rod and the second plate bracket, the rear connecting rod and the tail plate, the small connecting rod and the rear connecting rod, and the small connecting rod and the thrust seat are defined as frictionless contact, and the remaining friction is defined as sliding friction.

[0127] The front connecting rod and the second plate bracket, the rear connecting rod and the tail plate, the small connecting rod and the rear connecting rod, and the small connecting rod and the thrust seat are all hinged in the elbow connecting rod mechanism of the injection molding machine. When conducting static performance analysis, they are considered as frictionless forms, indicating that there is no obstacle to the rotation between them. There must be friction between the other structures, which affects the performance analysis of the overall mechanism, so they are all defined as sliding friction.

[0128] Step S401: obtaining the minimum mold loading and clamping force according to the injection molding machine information, and defining the loading and clamping force as a clamping force condition.

[0129] The loading clamping force cannot be less than the force applied to the smallest mold. This force is the minimum value of the loading clamping force. When performing static performance analysis, the loading clamping force cannot be lower than this minimum value.

[0130] Step S402: Determine the outer position of the tail plate tie rod hole and the thrust seat position during the clamping process according to the injection molding machine information, and define them as distance constraints.

[0131] During the clamping process, the outer position of the tail plate tie rod hole and the thrust seat are always fixed during the clamping process of the injection molding machine. Therefore, they need to be used as limiting conditions when conducting static performance analysis.

[0132] Step S403: Output boundary conditions according to frictionless contact, sliding friction, clamping force conditions and distance constraints.

[0133] In summary, when conducting static performance analysis, the values ​​set for the toggle linkage mechanism of the injection molding machine and the values ​​generated during the simulation process must fall within the boundary conditions. If they exceed the above range, the simulation results are invalid.

[0134] Reference Figure 4 , the response surface optimization method includes the following steps:

[0135] Step S500: defining the maximum stress of the tail plate and the deformation of the large plane of the second plate in the clamping direction as optimization targets.

[0136] In the toggle linkage mechanism, the maximum stress of the tail plate and the deformation of the large plane of the two plates in the clamping direction are important factors to be considered in the design. The quality of the two plays an important role in the quality of the toggle linkage mechanism, so these two factors are taken as the optimization goals of the toggle linkage mechanism design.

[0137] Step S501: define parameter independent variable information as optimization variables.

[0138] The optimized variables are important dimensions that can affect the maximum stress of the tail plate of the toggle link mechanism and the deformation of the large plane of the two plates in the clamping direction, and the optimized variables have a certain variable range to ensure that the toggle link can be used normally after the size change. In this embodiment, the optimized variables are the thickness of the front link and the thickness of the rear link.

[0139] Step S502: Based on preset constraints, control the increase or decrease of optimization variables to output an optimization result set.

[0140] The constraint conditions refer to ensuring the normal use of the toggle linkage mechanism and ensuring that the relevant dimensional values ​​are greater than zero, and that the stress and deformation values ​​of each part do not increase much or are less than the original values ​​when loaded after the model is optimized.

[0141] Under the constraint conditions, by controlling the optimization variables, namely the thickness of the front link and the thickness of the rear link, the other related parameter sizes of the parametric model will also increase or decrease accordingly, so that the maximum stress of the tail plate and the deformation of the large plane of the two plates in the clamping direction of the parametric model will change when loaded.

[0142] The optimization result set refers to the structure set of all optimization objectives output when the optimization variables are changed.

[0143] Step S503: Select the best optimization result from the optimization result set.

[0144] When performing an optimization and obtaining a large number of optimization results, it is necessary to select from the optimization result set the optimization result corresponding to the minimum maximum stress of the tail plate and the minimum deformation of the large plane of the two plates in the clamping direction. This optimization result is the optimal solution in the optimization result set.

[0145] Step S504: Determine whether to continue the optimization or output the optimization result based on the comparison between the optimization result and the optimization target.

[0146] The optimal solution obtained by one optimization is compared with the initial value of the optimization target. If the maximum stress and deformation corresponding to the optimal solution are both smaller than the initial value of the optimization target, it means that the optimization scheme is effective and the performance of the toggle linkage mechanism of the injection molding machine has been improved.

[0147] If the maximum stress and deformation corresponding to the optimal solution are still not less than the initial value of the optimization target, it means that the result of the optimization process is invalid and the performance of the toggle linkage mechanism of the injection molding machine is not improved. It is necessary to re-optimize to directly improve the performance of the toggle linkage mechanism of the injection molding machine.

[0148] Step S505: Match the corresponding fixed size information, parameter independent variable information and parameter dependent variable information according to the optimization result.

[0149] When the optimization result that can improve the performance of the toggle linkage mechanism of the injection molding machine is optimized, the parameters configured by the parameterized model in this optimization, namely, the fixed size information, the parameter independent variable information and the parameter dependent variable information, can be matched according to the optimization result. Compared with the initial parameterized model, the above parameters can improve the performance of the toggle linkage mechanism of the injection molding machine.

[0150] Step S506: outputting an optimized parameter model according to the fixed size information, the parameter independent variable information and the parameter dependent variable information.

[0151] When the fixed dimension information, parameter independent variable information and parameter dependent variable information are determined, an optimized parameterized model can be directly obtained through the above parameters, and the optimal injection molding machine toggle linkage mechanism arrangement scheme can be determined based on the optimized parameterized model.

[0152] The method of establishing the mathematical model includes the following steps:

[0153] Step S600: obtaining dimension parameter information of the injection molding machine according to preset injection molding machine information.

[0154] Dimension parameter information refers to the dimensional information of the mechanism that needs to be mathematically modeled in the injection molding machine. The injection molding machine information contains all the dimensions of the injection molding machine structure, and the dimensional parameter information can be queried in the injection molding machine information.

[0155] Step S601: Obtain variable parameters, fixed parameters, constraints and objective function according to size parameter information.

[0156] The dimensional parameter information contains all types of parameters in the mathematical model, including variable parameters, fixed parameters, constraints and objective functions. Among them, fixed parameters are fixed values ​​in the mathematical model, which are fixed dimensions in the elbow linkage mechanism of the injection molding machine. Variable parameters are the independent variables of the mathematical model, and the objective function is the dependent variable in the mathematical model. Variable parameters are the dimensions that can be changed in the elbow linkage mechanism of the injection molding machine. By changing the variable parameters, the objective function will also change, thereby increasing or decreasing the performance of the elbow linkage mechanism of the injection molding machine. Constraints are the limiting conditions of the mathematical model, which can limit the range of independent variables or the range of dependent variables. Variable parameters, fixed parameters, constraints and objective functions can be analyzed from the dimensional parameter information.

[0157] Step S602: define the thickness of the front link and the thickness of the rear link as variable parameters.

[0158] Since the change in the thickness of the front link and the rear link will affect the arrangement of the toggle link mechanism of the injection molding machine, thereby affecting the performance of the toggle link mechanism of the injection molding machine, the thickness of the front link and the rear link are variable parameters.

[0159] Step S603: defining the gaps between the second plate and the front and rear connecting rods, the gaps between the tail plate bracket and the front and rear connecting rods, the gap between the small connecting rod and the thrust seat, and the gap between the small connecting rod and the three-eye rear connecting rod as fixed parameters.

[0160] The gaps between the second plate and the front and rear connecting rods, the gaps between the tail plate bracket and the front and rear connecting rods, the gaps between the small connecting rod and the thrust seat, and the gaps between the small connecting rod and the three-eye rear connecting rod are all constant values, and the above parameters are related to the results of the mathematical model, so they are used as fixed parameters.

[0161] Step S604: defining the width of the connecting rod support, the width of the second plate support, the width of the tail plate support and the width of the thrust seat support as constraint conditions.

[0162] The width of the connecting rod bracket, the width of the second plate bracket, the width of the tail plate bracket and the width of the thrust seat bracket are all restrictive conditions. When the thickness of the front connecting rod and the rear connecting rod is changed, the above parameters cannot be changed.

[0163] Step S605: define the maximum stress of the tail plate and the deformation of the large plane of the two plates in the direction of the clamping axis as the objective function.

[0164] When the thickness of the front connecting rod and the rear connecting rod changes, the maximum stress of the tail plate and the deformation of the large plane of the two plates in the direction of the clamping axis will also change accordingly. The maximum stress of the tail plate and the deformation of the large plane of the two plates in the direction of the clamping axis are directly related to the performance of the toggle connecting rod mechanism of the injection molding machine, so they are used as the objective function.

[0165] Step S606: Output the mathematical model according to the variable parameters, fixed parameters, constraints and objective function.

[0166] After determining the variable parameters, fixed parameters, constraints and objective functions, the mathematical model of the elbow linkage mechanism of the injection molding machine can be obtained.

[0167] The objective type of the objective function in the mathematical model is set to Minimize.

[0168] Minimize refers to the minimum value. By solving the minimum value of the objective function, the minimum value of the maximum stress of the tail plate and the minimum value of the deformation of the large plane of the two plates in the direction of the clamping axis can be obtained, thereby obtaining the optimal solution for the thickness of the front connecting rod and the rear connecting rod to improve the structural performance of the toggle linkage mechanism.

[0169] The formula of the mathematical model is:

[0170]

[0171] Among them, fi is the maximum stress of the tail plate;

[0172] Δli--deformation of the two plates in the clamping direction;

[0173] B--front connecting rod thickness;

[0174] C--rear connecting rod thickness;

[0175] D--is a fixed value;

[0176] M--the sum of the thickness of the thrust seat bracket and the small connecting rod;

[0177] K--The sum of the thickness of the second plate bracket and the front connecting rod, and the sum of the thickness of the rear connecting rod bracket and the rear connecting rod.

[0178] When conducting actual structural simulation analysis of the toggle linkage mechanism of the injection molding machine, the above formula can be applied to optimize the structure of the toggle linkage mechanism of the injection molding machine. By solving the minimum value of the maximum stress of the tail plate and the minimum value of the deformation of the two plates in the clamping direction, the optimal solution of the toggle linkage mechanism of the injection molding machine can be obtained.

[0179] Based on the same inventive concept, an embodiment of the present invention provides a system for determining the arrangement of a toggle link mechanism of an injection molding machine, comprising:

[0180] A generating unit, used for generating a parametric model of a toggle linkage mechanism of an injection molding machine;

[0181] The analysis unit is used to analyze the parameterized model generated by the generation unit to obtain the maximum stress of the tail plate and the deformation of the large plane of the second plate in the clamping direction;

[0182] A selection unit is used to select an optimization parameter model from numerous injection molding machine toggle linkage mechanisms within a preset setting range based on the maximum stress and deformation obtained by the analysis unit;

[0183] A determination unit, used for determining the injection molding machine toggle-link mechanism corresponding to the optimization parameter model selected by the selection unit as the optimal injection molding machine toggle-link mechanism required by the injection molding machine;

[0184] A memory for storing a program for determining a method for arranging a toggle link mechanism of an injection molding machine;

[0185] The program in the memory can be loaded and executed by the processor and realize a method for determining the arrangement of a toggle link mechanism of an injection molding machine.

[0186] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0187] An embodiment of the present invention provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed by a method for determining the arrangement of a toggle link mechanism of an injection molding machine.

[0188] Computer storage media include, for example, various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0189] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for determining the arrangement of a toggle link mechanism of an injection molding machine, characterized in that: include: Based on a preset mathematical model of the toggle link mechanism, obtaining structural parameter information of the toggle link mechanism; A parameterized model is obtained according to the structural parameter information by a preset parameter modeling method; According to the parameterized model, the maximum stress of the tail plate of the toggle linkage mechanism and the deformation of the large plane of the two plates in the clamping direction are obtained by using the preset stress and deformation analysis method; According to the maximum stress and deformation, the optimized parameter model is obtained by using the preset response surface optimization method; Output the toggle linkage mechanism arrangement plan based on the optimized parameter model.

2. The method for determining the arrangement of the toggle link mechanism of an injection molding machine according to claim 1, characterized in that: The parameter modeling method comprises: Matching the structural parameter information with a preset product database to determine fixed dimension information of the toggle link mechanism; Analyze the structural parameter information and the preset associated database to determine the parameter independent variable information; Determine parameter dependent variable information according to fixed size information and parameter independent variable information; A parametric model is obtained according to fixed dimension information, parameter independent variable information, parameter dependent variable information and a preset generation database, and the parametric model is output.

3. The method for determining the arrangement of a toggle link mechanism of an injection molding machine according to claim 1, characterized in that: The stress and deformation analysis method comprises: Determine static performance parameters according to preset injection molding machine information and preset simulation database, the static performance parameters including material information, contact information, load information and position constraint information; Matching the parameterized model with a preset grid processing database to obtain model gridding information; Based on the preset solution results and preset boundary conditions, the maximum stress and deformation are output according to the model meshing information and static performance parameters.

4. A method for determining the arrangement of a toggle link mechanism of an injection molding machine according to claim 3, characterized in that: The boundary condition is obtained by a boundary condition setting method, and the boundary condition setting method includes: According to the information of the injection molding machine, the contact between the front connecting rod and the second plate bracket, the rear connecting rod and the tail plate, the small connecting rod and the rear connecting rod, and the small connecting rod and the thrust seat are defined as frictionless contact, and the remaining friction is defined as sliding friction; The minimum mold loading and clamping force is obtained according to the injection molding machine information, and the loading and clamping force is defined as the clamping force condition; According to the information of the injection molding machine, the outer position of the tail plate tie rod hole and the thrust seat position during the clamping process are determined and defined as distance constraints; Output boundary conditions based on frictionless contact, sliding friction, clamping force conditions, and distance constraints.

5. The method for determining the arrangement of the toggle link mechanism of an injection molding machine according to claim 2, characterized in that: The response surface optimization method comprises: The maximum stress of the tail plate and the deformation of the large plane of the second plate in the clamping direction are defined as the optimization targets; Define parameter independent variable information as optimization variables; Based on the preset constraints, control the increase or decrease of optimization variables to output a set of optimization results; Selecting the optimized deformation variable with the smallest value from the set of optimized deformation variables; Determine whether to continue optimization or output optimization results based on the comparison between optimization results and optimization targets; Matching the corresponding fixed size information, parameter independent variable information and parameter dependent variable information according to the optimization result; The optimized parameter model is outputted according to the fixed dimension information, the parameter independent variable information and the parameter dependent variable information.

6. The method for determining the arrangement of a toggle link mechanism of an injection molding machine according to claim 1, characterized in that: The mathematical model is obtained by a method for establishing a mathematical model, and the method for establishing a mathematical model comprises: Obtaining dimension parameter information of the injection molding machine according to preset injection molding machine information; Obtain variable parameters, fixed parameters, constraints and objective functions according to the size parameter information; The thickness of the front link and the thickness of the rear link are defined as variable parameters; The gaps between the second plate and the front and rear connecting rods, the gaps between the tail plate bracket and the front and rear connecting rods, the gaps between the small connecting rod and the thrust seat, and the gaps between the small connecting rod and the three-eye rear connecting rod are defined as fixed parameters; The width of the connecting rod bracket, the width of the second plate bracket, the width of the tail plate bracket and the width of the thrust seat bracket are defined as constraint conditions; The maximum stress of the tail plate and the deformation of the large plane of the two plates in the direction of the clamping axis are defined as the objective function; Output mathematical model based on variable parameters, fixed parameters, constraints and objective function.

7. A method for determining the arrangement of a toggle link mechanism of an injection molding machine according to claim 6, characterized in that: The objective type of the objective function is set to Minimize.

8. The method for determining the arrangement of a toggle link mechanism of an injection molding machine according to claim 7, characterized in that: The formula of the mathematical model is: Among them, fi is the maximum stress of the tail plate; Δli--deformation of the two plates in the clamping direction; B--front connecting rod thickness; C--rear connecting rod thickness; D--is a fixed value; M--the sum of the thickness of the thrust seat bracket and the small connecting rod; K--The sum of the thickness of the second plate bracket and the front connecting rod, and the sum of the thickness of the rear connecting rod bracket and the rear connecting rod.

9. A system for determining the arrangement of a toggle link mechanism of an injection molding machine, characterized in that: include: A generating unit, used for generating a parametric model of a toggle linkage mechanism of an injection molding machine; The analysis unit is used to analyze the parameterized model generated by the generation unit to obtain the maximum stress of the tail plate and the deformation of the large plane of the second plate in the clamping direction; A selection unit is used to select an optimization parameter model from numerous injection molding machine toggle linkage mechanisms within a preset setting range based on the maximum stress and deformation obtained by the analysis unit; A determination unit, used for determining the injection molding machine toggle-link mechanism corresponding to the optimization parameter model selected by the selection unit as the optimal injection molding machine toggle-link mechanism required by the injection molding machine; A memory for storing a program of a method for determining an arrangement of a toggle link mechanism of an injection molding machine according to any one of claims 1 to 8; The program in the memory can be loaded and executed by the processor to implement a method for determining the arrangement of a toggle link mechanism of an injection molding machine as claimed in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer program is stored which can be loaded by a processor and execute the method for determining the arrangement of the toggle link mechanism of an injection molding machine as claimed in any one of claims 1 to 8.

Images