CN118616687B - A temperature control method and system for thermal balance analysis of casting mold - Google Patents
A temperature control method and system for thermal balance analysis of casting mold Download PDFInfo
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Abstract
The invention provides a temperature control method and a system for casting mold thermal balance analysis, which relate to the technical field of temperature control, and the method comprises the following steps: extracting a die feature set of a casting die, determining a casting solidification sequence, carrying out feature reverse sequence identification on the die feature set to establish key nodes, reading control parameters of a casting alloy filling process to carry out node position flow rate fitting of the key nodes, carrying out temperature loss analysis based on the key nodes according to a flow rate fitting result and initial alloy liquid temperature, carrying out filling influence evaluation, determining a continuous node compensation temperature of filling, carrying out solidification temperature control fitting of castings according to the simulated temperature field and the casting solidification sequence to generate solidification cooling auxiliary parameters to carry out temperature control management of the castings, solving the technical problems of low production efficiency of casting models caused by lack of temperature control in the casting die process, realizing accurate establishment of local temperature gradients, and improving heat balance of the casting die.
Description
Technical Field
The invention relates to the technical field of temperature control, in particular to a temperature control method and system for casting mold thermal balance analysis.
Background
With the development of science and technology, particularly the development of the field of thermal balance analysis of casting molds, with the increasing requirement on the quality of die castings, the requirement on mold temperature control is also urgent, so that the mold temperature needs to be effectively controlled and regulated, the service life of the die casting mold can be prolonged, and the method is also a key technological parameter for ensuring good filling of alloy liquid and stable casting quality. At present, the quality of a die casting is required, a die casting workshop with a corresponding temperature control means is not required, the die is basically required to be preheated before production, the problems that the molten alloy is chilled too fast, the temperature gradient of the die is suddenly increased to reduce the quality of the casting and the die is damaged too early are solved, the temperature of key parts of the die is required to be checked and regulated according to a technical rule, the production rhythm and the pouring flow of the molten alloy are controlled, and the spraying is regulated, but the temperature control is not required in the process of casting the die in the prior art, so that the production efficiency of a casting model is low are solved.
Disclosure of Invention
The application provides a temperature control method and a temperature control system for casting mold thermal balance analysis, which are used for solving the technical problem of low production efficiency of a casting model caused by lack of temperature control in the process of casting a mold in the prior art.
In view of the above problems, the present application provides a temperature control method and system for thermal equilibrium analysis of a casting mold.
The application provides a temperature control method for thermal balance analysis of a casting mold, which comprises the steps of extracting a mold feature set of the casting mold, wherein the mold feature set is obtained by carrying out feature extraction on structural data after mold structure data of the casting mold are obtained through communication, the mold feature set comprises shape features, inner diameter features and inflection point features, carrying out casting fitting on the casting mold, determining a casting solidification sequence, carrying out feature reverse sequence identification on the mold feature set through the casting solidification sequence, establishing key nodes by the mold feature set and the feature reverse sequence identification, reading control parameters of a casting alloy filling process, carrying out node position flow rate fitting on the basis of the control parameters, carrying out temperature loss analysis on the basis of the key nodes according to a flow rate fitting result and an initial alloy liquid temperature, generating a temperature loss analysis result, carrying out filling type influence on the basis of the temperature loss analysis result, determining a filling type continuous node compensation temperature, establishing a filling type completed anthropomorphic temperature field, carrying out cooling auxiliary temperature compensation and carrying out auxiliary cooling temperature control parameter setting auxiliary cooling parameter setting and carrying out auxiliary cooling type temperature compensation parameter setting control and auxiliary cooling type cooling parameter setting auxiliary cooling type parameter setting.
The application provides a temperature control system for casting mold heat balance analysis, which comprises a feature extraction module, a temperature control module and a temperature control module, wherein the feature extraction module is used for extracting a mold feature set of a casting mold, the mold feature set is obtained by carrying out feature extraction on structural data after mold structural data of the casting mold are obtained through communication, and the mold feature set comprises shape features, inner diameter features and inflection point features; the device comprises a casting mould, an identification module, a node establishment module, a control module, a temperature loss analysis module, a cooling control module and a cooling control module, wherein the identification module is used for carrying out casting fitting on the casting mould, determining a casting solidification sequence, carrying out characteristic reverse sequence identification on the mould characteristic set through the casting solidification sequence, establishing key nodes according to the mould characteristic set and the characteristic reverse sequence identification, the key nodes are nodes with temperature loss analysis of father-son node identification, the temperature loss analysis module is used for reading control parameters of a casting alloy filling process, carrying out node position flow rate fitting on the key nodes based on the control parameters, carrying out temperature loss analysis on the key nodes according to a flow rate fitting result and an initial alloy liquid temperature, generating a temperature loss analysis result, a filling influence evaluation module is used for carrying out filling influence evaluation based on the temperature loss analysis result, determining filled continuous node compensation temperature, a control module is used for establishing a fitting mimicry-state temperature field, carrying out solidification control on castings according to the fitting of the temperature and the casting solidification sequence, generating an auxiliary cooling control parameter, and the temperature control module is used for carrying out temperature control management on the castings through the continuous node compensation temperature of the filling and the solidification and cooling auxiliary parameters.
One or more technical schemes provided by the application have at least the following technical effects or advantages:
The application provides a temperature control method and a temperature control system for casting mold heat balance analysis, relates to the technical field of temperature control, solves the technical problem of low production efficiency of a casting model caused by lack of temperature control in the process of casting molds in the prior art, realizes accurate establishment of local temperature gradients, and improves the heat balance of the casting molds.
Drawings
FIG. 1 is a schematic flow chart of a temperature control method for casting mold thermal equilibrium analysis.
FIG. 2 is a schematic diagram of a flow chart for establishing a simulated temperature field in a temperature control method for thermal equilibrium analysis of a casting mold according to the present application.
Fig. 3 is a schematic flow chart of auxiliary parameters for solidification and cooling in a temperature control method for thermal balance analysis of a casting mold.
Fig. 4 is a schematic structural diagram of a temperature control system for analyzing the thermal balance of a casting mold according to the present application.
The reference numerals illustrate that the device comprises a feature extraction module 1, an identification module 2, a node establishment module 3, a temperature loss analysis module 4, a charging influence evaluation module 5, a control fitting module 6 and a temperature control module 7.
Detailed Description
The application provides a temperature control method and a temperature control system for thermal balance analysis of a casting mold, which are used for solving the technical problem of low production efficiency of a casting model caused by lack of temperature control in the process of casting the mold in the prior art.
Example 1
As shown in fig. 1, an embodiment of the present application provides a temperature control method for thermal equilibrium analysis of a casting mold, the method comprising:
A100, extracting a mold feature set of a casting mold, wherein the mold feature set is obtained by carrying out feature extraction on structural data after mold structural data of the casting mold are obtained through communication, and comprises shape features, inner diameter features and inflection point features;
In the application, the temperature control method for the thermal balance analysis of the casting mold is applied to the temperature control system for the thermal balance analysis of the casting mold, in order to improve the mold quality and the production efficiency in the casting process of the casting mold, the mold characteristics of the casting mold are required to be sequentially extracted, namely, after the temperature control system for the thermal balance analysis of the casting mold is in data communication with a target casting mold based on a transmission channel, the mold structure data of the casting mold is determined, the mold structure data can comprise upper and lower template structure data, mold core structure data, slider structure data and cooling system structure data, the mold structure characteristics in the structure data can be acquired on the basis, the acquired structure characteristics can be the shape characteristics, the inner diameter characteristics and the inflection point characteristics of the casting mold, the shape characteristics can be determined according to different casting processes, the inner diameter characteristics of the casting mold, the ceramic mold and the like, the inflection point characteristics refer to the characteristic on the occurrence of concave-convex change in the casting mold under different casting processes, and the acquired structure characteristics can be important reference parameters when the thermal balance analysis is realized.
Step A200, performing casting fitting on the casting mould, determining casting solidification sequence, and performing feature reverse sequence identification on the mould feature set through the casting solidification sequence;
In the present application, in order to ensure the casting efficiency in the casting process of the target mold, it is necessary to determine the casting sequence of the casting mold, namely, first, perform casting fitting on the casting mold, combine two or more simulation methods of the casting mold to perform casting simulation, and, illustratively, in the casting process, combine the finite element method and the finite volume method, and solve the data such as molten metal flow, temperature field distribution, stress strain distribution, etc. of the casting mold, on this basis, calculate the solidification sequence of the casting mold, determine the casting solidification sequence according to the solidification sequence, and further, perform a reverse sequence identification of features on the extracted mold feature set according to the determined casting solidification sequence, through which the analysis of temperature loss can be performed when the liquid flows in the early stage, and the analysis of temperature loss can be performed when the liquid solidifies in the late stage.
A300, establishing key nodes according to the mold feature set and the feature reverse sequence identification, wherein the key nodes are nodes with temperature loss analysis of father-son node identification;
In the application, in order to more accurately control the temperature of a casting mold during the thermal balance analysis, key nodes in the thermal balance analysis of the casting mold are required to be established according to the shape features, the inner diameter features and the inflection point features in the extracted mold feature set and the obtained feature reverse sequence identification, wherein the key nodes refer to nodes with father-son node identification for the temperature loss analysis, namely the shape features, the inner diameter features and the inflection point features in the mold feature set are hierarchically divided according to the casting solidification sequence in the feature reverse sequence identification in the thermal balance analysis of the casting mold, so that a plurality of nodes with different levels are generated, meanwhile, nodes arranged in a previous level are called parent nodes of nodes connected in a next level, nodes in the next level are called child nodes of nodes connected in the previous level, and each node contains temperature loss data of the casting mold at the current node moment, so that the temperature control compaction foundation is performed during the thermal balance analysis of the casting mold is realized subsequently.
Step A400, reading control parameters of a casting alloy filling process, performing node position flow rate fitting of the key nodes based on the control parameters, and performing temperature loss analysis based on the key nodes according to a flow rate fitting result and initial alloy liquid temperature to generate a temperature loss analysis result;
further, the step a400 of the present application further includes:
step A410, reading the ground state temperature of the casting mold, and establishing an initial data set through the ground state temperature and the ambient temperature;
Step A420, carrying out initial temperature loss analysis of the key nodes through a formula, wherein the calculation is as follows:
;
Wherein, As a result of the initial temperature loss at the nth critical node,For the convective heat transfer coefficient,Is the heat exchange area of the nth key node,Fitting the results for the flow rate of the nth critical node,The node temperature representing the n-1 th critical node,Is the ground state temperature;
And step A430, obtaining a temperature fitting result of the casting mold according to the initial temperature loss result, carrying out temperature loss compensation on the mold temperature fitting result according to the ambient temperature, and generating a temperature loss analysis result according to the compensation result.
Further, step a430 of the present application includes:
step A431, obtaining a weighted average value of initial temperature loss results under unit time length, and taking the weighted average value as the initial temperature loss of the casting mold;
step A432, obtaining a convection temperature difference according to the loss initial temperature and the ambient temperature;
And step A433, performing temperature loss fitting of the casting mold through the convection temperature difference, the unit time length and the outer end surface area of the casting mold, and completing initial temperature loss compensation according to the temperature loss fitting result to generate the temperature loss analysis result.
In the application, in order to better analyze the temperature loss in the process of casting the die, the control parameters in the process of casting the alloy die need to be read firstly, the control parameters can comprise a liquid rising speed parameter, a die filling pressure parameter, a die filling speed parameter and a crust time parameter, the flow rate fitting is carried out with the node position of a key node on the basis, the flow rate in the process of casting the alloy is matched with the liquid rising speed parameter, the die filling pressure parameter, the die filling speed parameter and the crust time parameter in the control parameters on the key node, a flow rate fitting result and an initial alloy liquid temperature are generated, meanwhile, the temperature loss analysis is carried out on the basis of the key node, the process can be that the ground state temperature of the casting die is read firstly, the reference temperature of the casting die in the casting state is read, the ground state temperature and the environment temperature of the casting die are recorded as an initial data set after data integration, and the initial temperature loss analysis of the key node is carried out by the following formula:
;
Wherein, As a result of the initial temperature loss at the nth critical node,For the convective heat transfer coefficient,Is the heat exchange area of the nth key node,Fitting the results for the flow rate of the nth critical node,The node temperature representing the n-1 th critical node,Is the ground state temperature;
Further, the temperature loss data is fitted through the initial temperature loss results corresponding to the key nodes, the temperature loss compensation is carried out on the die temperature fitting results according to the environmental temperature, namely when the temperature in the die temperature fitting results is lower than the environmental temperature, the die casting process is required to be subjected to temperature compensation according to the temperature difference, namely, firstly, the weighted average value of the initial temperature loss results under the unit time is obtained, the initial temperature loss results under the unit time are multiplied by the weight value corresponding to the weighted average value, then the weighted average value is summed to obtain the total value, the total unit time is divided by the total unit number of the initial temperature loss results under the unit time, the weighted average value is taken as the initial temperature loss of the casting die, further, the difference is taken as the difference between the initial temperature loss data and the environmental temperature, meanwhile, the alloy liquid of the casting die and the casting die are taken as the whole data through the temperature difference, the casting die is taken as the whole data, the temperature loss of the casting die is analyzed through the casting die, the temperature loss of the casting die is calculated according to the temperature difference, and the temperature loss of the temperature compensation formula is calculated, and the temperature loss of the casting die is controlled, and the temperature loss is analyzed when the temperature loss is calculated, and the temperature loss is balanced is calculated, and the result is analyzed.
A500, performing model filling influence evaluation based on the temperature loss analysis result, and determining model filling continuous node compensation temperature;
In the present application, in order to improve accuracy of temperature loss compensation of a casting mold, it is necessary to perform mold filling influence evaluation on a casting mold by using a temperature loss analysis result generated by temperature loss analysis as reference basic data, that is, to record the degree of mold filling influence of the casting mold in terms of mold properties, casting conditions, casting structure, etc. of the casting mold, to evaluate positive and negative influences of the casting mold in the mold filling process according to mold heat storage coefficients, mold temperatures, mold gases in the mold properties, casting temperatures in the casting conditions, mold thicknesses in the casting structure, casting complexity, etc. of the casting system, and to determine the continuous node compensation temperature of the mold filling according to the evaluated positive and negative influence evaluations, that is, to monitor the temperature data of the continuous node, to perform temperature compensation in the continuous node based on the positive or negative influence evaluations, so as to perform temperature control in the later stage of the casting mold thermal balance analysis, as reference data.
A600, establishing a simulated temperature field after filling, performing solidification temperature control fitting of castings according to the simulated temperature field and the casting solidification sequence, and generating solidification cooling auxiliary parameters based on a solidification temperature fitting result;
Further, as shown in fig. 2, step a600 of the present application further includes:
Step A610, fitting full time nodes of each cavity according to the flow rate fitting result and the mold feature set;
Step A620, calculating the temperature of the casting at the key node position before solidification through full time node and continuous node compensation temperature;
and step A630, completing establishment of a simulated temperature field based on the temperature calculation result of the castings at the key node positions.
Further, as shown in fig. 3, step a600 of the present application further includes:
step A640, establishing local temperature gradient constraint through the mimicry temperature field;
step A650, taking the casting solidification sequence as a first constraint and the local temperature gradient constraint as a second constraint, and executing solidification temperature fitting of the fastest solidification speed;
and step A660, determining solidification cooling auxiliary parameters according to the solidification temperature fitting result.
Further, step a660 of the present application includes:
Step A661, establishing a multidimensional evaluation fitness function of solidification and cooling control, wherein the multidimensional evaluation fitness function comprises a complexity evaluation fitness function, a stability evaluation fitness function and an realizability evaluation fitness function;
Step A662, executing cooling auxiliary parameter control evaluation corresponding to a solidification temperature fitting result through the multi-dimensional evaluation fitness function;
And step A663, screening according to the control evaluation result to obtain the solidification cooling auxiliary parameter.
In the application, in order to ensure the heat balance in the process of casting the mold, a simulated temperature field is required to be established for the mold after the mold filling is completed, wherein the establishment process can be to firstly carry out fitting on full time nodes of all cavities through alloy liquid flow rate and mold characteristics contained in a mold characteristic set in a flow rate fitting result, namely, in the process of casting the mold, when all cavities in the mold start from alloy liquid inflow, the time nodes when each cavity is filled are fitted according to the flow rate of the alloy liquid in unit time, after the time nodes are filled, the temperature of a casting at the critical node position of the casting mold before solidification is calculated through full time nodes and continuous node compensation temperature, namely, the temperature of the critical node position of the casting at the full time nodes and the compensation temperature at the continuous nodes are taken as temperature reference data, and further, the temperature of the critical node position of the casting is calculated, and on the basis of the temperature calculation result of the critical node position casting is sequentially processed according to the time node order, so that the establishment of the simulated temperature field after the mold filling is completed is obtained.
Further, the control fitting is performed on the solidification temperature of the casting by taking the constructed mimicry temperature field and the casting solidification sequence as basic reference data, namely, firstly, the local temperature gradient constraint of the casting is established through the mimicry temperature field, the local temperature gradient constraint is obtained by dividing according to the temperature change range in the process of historical casting mould, the casting solidification sequence is taken as the first constraint of the casting solidification temperature control fitting, the local temperature gradient constraint is taken as the second constraint of the casting solidification temperature control fitting, the solidification temperature fitting with the fastest solidification speed is performed on the casting, namely, the fastest solidification data corresponding to the first order is extracted according to the casting solidification sequence under the first constraint, and the fastest solidification temperature data is extracted according to the temperature data in the local temperature gradient under the second constraint, the solidification temperature of the fastest solidification speed is fitted based on the fastest solidification data and the fastest solidification temperature data, and further the solidification cooling auxiliary parameter is determined according to the solidification temperature fitting result, which means that firstly, a multidimensional evaluation fitness function for solidification cooling control needs to be established, wherein the multidimensional evaluation fitness function is a function for evaluating the fitness in the solidification cooling control process through multiple angles, the higher the evaluation value is, the higher the fitness is, meanwhile, the multidimensional evaluation fitness function comprises a complexity evaluation fitness function, a stability evaluation fitness function and an realizability evaluation fitness function, the complexity evaluation fitness function is used for evaluating the quantity of water pipelines subjected to temperature change control in the casting mold process, the stability evaluation fitness function is used for carrying out change conversion on the water temperature and the flow rate in the water pipelines, the realizability evaluation fitness function is used for realizing the feasibility of fixing the number of water pipelines, the water temperature and the water flow rate in the casting mold process, and is exemplified by that the water pipeline in the casting mold is a small pipe, the contact surface with the casting mold is small, if the rapid cooling of the casting mold is required to be realized, the realizability evaluation fitness is relatively poor, so that the corresponding realizability evaluation fitness is low, further, the cooling auxiliary parameter control evaluation corresponding to the solidification temperature fitting result is executed through the multidimensional evaluation fitness function, namely, the fitness evaluation of the size and the number of the water pipelines is carried out on the cooling auxiliary parameter corresponding to the solidification temperature fitting result through the complexity evaluation fitness function, the adaptability evaluation of the water temperature and the flow rate is carried out on the cooling auxiliary parameter corresponding to the solidification temperature fitting result through the stability evaluation fitness function, the feasibility of the realizability evaluation fitness function on the cooling auxiliary parameter corresponding to the solidification temperature fitting result is finally summarized and then recorded as the temperature control casting result of the mold heat balance analysis, and finally, the cooling auxiliary parameters are determined after the control evaluation is screened according to the solidification cooling effect, and the accuracy of the temperature control analysis is realized.
And step A700, carrying out temperature control management on the castings through the continuous node compensation temperature of the mold filling and the solidification and cooling auxiliary parameters.
Further, the step a700 of the present application further includes:
step A710, establishing a result-oriented compensation network, and carrying out abnormal backtracking analysis on casting production results through the compensation network;
Step A720, extracting compensation data according to an abnormal backtracking analysis result;
and step A730, executing temperature control optimization processing through the compensation data.
In the application, in order to make the temperature control management of the casting more accurate, firstly, the influence of the continuous node compensation temperature in the mold filling process on the temperature rise in the casting mold process and the influence of the solidification cooling auxiliary parameters obtained by the screening on the temperature reduction in the casting mold process are needed, the control management of the temperature rise or the temperature reduction of the casting mold in the heat balance analysis is further carried out, a result-oriented compensation network is further established, the result-oriented compensation network is used for optimizing and compensating the temperature in the casting mold process when the temperature of the casting is abnormal in the process of temperature control management, namely, firstly, the abnormal in the casting mold production result can comprise the conditions of deformation, crack, air hole and the like of the casting through the compensation network, the abnormal retrospective analysis of the casting is carried out on the basis, the casting abnormal sources corresponding to the conditions of deformation, crack, air hole and the like of the casting are obtained, the casting abnormal sources can be liquid metal sticking, slow cooling, coarse grains and the like due to the temperature rise, thereby determining the abnormal casting metal, the retrospective analysis can be carried out on the casting abnormal sources according to the abnormal casting temperature rise, the abnormal casting control data, the retrospective analysis data can be further carried out on the casting mold production data through the retrospective analysis, the abnormal control data can be carried out on the casting mold, and the abnormal retroactive analysis data can be better, and the casting control data can be carried out according to the control retroactive analysis data, and the final control data can be carried out on the casting data, and the abnormal control data can be guaranteed.
In summary, the temperature control method for the casting mold heat balance analysis provided by the embodiment of the application at least has the following technical effects that the accurate establishment of local temperature gradient is realized, and the casting mold heat balance is improved.
Example two
Based on the same inventive concept as the temperature control method of a casting mold heat balance analysis in the foregoing embodiments, as shown in fig. 4, the present application provides a temperature control system of a casting mold heat balance analysis, the system comprising:
The feature extraction module 1 is used for extracting a mold feature set of the casting mold, wherein the mold feature set is obtained by carrying out feature extraction on structural data after mold structural data of the casting mold are obtained through communication, and the mold feature set comprises a shape feature, an inner diameter feature and an inflection point feature;
The identification module 2 is used for carrying out casting fitting on the casting mould, determining casting solidification sequence, and carrying out characteristic reverse sequence identification on the mould characteristic set through the casting solidification sequence;
the node establishing module 3 is used for establishing key nodes according to the mold feature set and the feature reverse sequence identification, wherein the key nodes are nodes with temperature loss analysis of father-son node identification;
The temperature loss analysis module 4 is used for reading control parameters of the casting alloy filling process, performing node position flow rate fitting of the key nodes based on the control parameters, performing temperature loss analysis based on the key nodes according to a flow rate fitting result and the initial alloy liquid temperature, and generating a temperature loss analysis result;
The filling type influence evaluation module 5 is used for performing filling type influence evaluation based on the temperature loss analysis result, and determining the filling type continuous node compensation temperature;
The control fitting module 6 is used for establishing a simulated temperature field with the completed filling, performing solidification temperature control fitting of the castings according to the simulated temperature field and the casting solidification sequence, and generating solidification cooling auxiliary parameters based on a solidification temperature fitting result;
and the temperature control module 7 is used for carrying out temperature control management on the castings through the continuous node compensation temperature of the filling and the solidification cooling auxiliary parameters.
Further, the system further comprises:
The data set establishing module is used for reading the ground state temperature of the casting mold and establishing an initial data set through the ground state temperature and the environment temperature;
the loss analysis module is used for carrying out initial temperature loss analysis of the key nodes through a formula and is calculated as follows:
;
Wherein, As a result of the initial temperature loss at the nth critical node,For the convective heat transfer coefficient,Is the heat exchange area of the nth key node,Fitting the results for the flow rate of the nth critical node,The node temperature representing the n-1 th critical node,Is the ground state temperature;
and the first loss compensation module is used for obtaining a temperature fitting result of the casting mold according to the initial temperature loss result, carrying out temperature loss compensation on the mold temperature fitting result according to the ambient temperature, and generating a temperature loss analysis result according to the compensation result.
Further, the system further comprises:
the weighted average module is used for obtaining a weighted average value of initial temperature loss results under unit time length, and taking the weighted average value as the loss initial temperature of the casting mold;
the flow temperature difference module is used for obtaining a convection temperature difference according to the loss initial temperature and the environment temperature;
And the second loss compensation module is used for carrying out temperature loss fitting of the casting mould through the convection temperature difference, the unit time length and the outer end surface area of the casting mould, completing initial temperature loss compensation according to the temperature loss fitting result and generating the temperature loss analysis result.
Further, the system further comprises:
the node fitting module is used for performing node fitting of filling time of each cavity according to the flow rate fitting result and the die characteristic set;
the first calculation module is used for calculating the temperature of the casting at the key node position before solidification through the compensation temperature of the full time node and the continuous node;
And the second calculation module is used for completing establishment of a simulated temperature field based on the calculation result of the temperature of the casting at the key node position.
Further, the system further comprises:
The first constraint module is used for establishing local temperature gradient constraint through the mimicry temperature field;
A second constraint module for performing a solidification temperature fit at a fastest solidification speed with the casting solidification sequence as a first constraint and the local temperature gradient constraint as a second constraint;
And the first parameter determining module is used for determining the solidification cooling auxiliary parameter according to the solidification temperature fitting result.
Further, the system further comprises:
The function determining module is used for establishing a multidimensional evaluation fitness function of solidification and cooling control, wherein the multidimensional evaluation fitness function comprises a complexity evaluation fitness function, a stability evaluation fitness function and an realizability evaluation fitness function;
The control evaluation module is used for executing cooling auxiliary parameter control evaluation corresponding to the solidification temperature fitting result through the multi-dimensional evaluation fitness function;
And the second parameter determining module is used for screening and obtaining the solidification cooling auxiliary parameter according to the control evaluation result.
Further, the system further comprises:
The backtracking analysis module is used for establishing a result-oriented compensation network and carrying out abnormal backtracking analysis on the casting production result through the compensation network;
The data extraction module is used for extracting compensation data according to the abnormal backtracking analysis result;
and the optimizing processing module is used for executing temperature control optimizing processing through the compensation data.
From the foregoing detailed description of a temperature control method for a thermal balance analysis of a casting mold, it will be apparent to those skilled in the art that a temperature control system for a thermal balance analysis of a casting mold in this embodiment is relatively simple in description, and relevant points refer to the description of the method section, since it corresponds to the method disclosed in the embodiment.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method of temperature control for casting mold thermal balance analysis, the method comprising:
Extracting a die feature set of a casting die, wherein the die feature set is obtained by carrying out feature extraction on structural data after die structural data of the casting die are obtained through communication, and comprises shape features, inner diameter features and inflection point features;
Performing casting fitting on the casting mould, determining casting solidification sequence, and performing feature reverse sequence identification on the mould feature set through the casting solidification sequence;
establishing key nodes according to the mold feature set and the feature reverse sequence identification, wherein the key nodes are nodes with temperature loss analysis of father-son node identification;
reading control parameters of a casting alloy filling process, performing node position flow rate fitting of the key nodes based on the control parameters, performing temperature loss analysis based on the key nodes according to a flow rate fitting result and initial alloy liquid temperature, and generating a temperature loss analysis result, wherein the control parameters comprise a liquid lifting speed parameter, a filling pressure parameter, a filling speed parameter and a crusting time parameter;
Performing filling type influence evaluation based on the temperature loss analysis result, and determining filling type continuous node compensation temperature, wherein the filling type influence evaluation refers to monitoring temperature data of continuous nodes, and performing temperature compensation in the continuous nodes based on positive influence evaluation or negative influence evaluation;
Establishing a simulated temperature field with the completed filling, performing solidification temperature control fitting of castings according to the simulated temperature field and the casting solidification sequence, and generating solidification cooling auxiliary parameters based on solidification temperature fitting results;
performing temperature control management on the casting through the continuous node compensation temperature of the mold filling and the solidification and cooling auxiliary parameters;
Reading the ground state temperature of the casting mold, and establishing an initial data set through the ground state temperature and the environment temperature;
The initial temperature loss analysis of the key nodes is carried out through a formula, and the calculation is as follows:
;
Wherein, As a result of the initial temperature loss at the nth critical node,For the convective heat transfer coefficient,Is the heat exchange area of the nth key node,Fitting the results for the flow rate of the nth critical node,The node temperature representing the n-1 th critical node,Is the ground state temperature;
obtaining a temperature fitting result of the casting mold according to the initial temperature loss result, compensating the temperature loss of the temperature fitting result of the mold according to the ambient temperature, and generating a temperature loss analysis result according to the compensation result;
The concrete steps of the casting solidification sequence for carrying out solidification temperature control fitting of castings are that local temperature gradient constraint is established through the mimicry temperature field;
taking the casting solidification sequence as a first constraint, and taking the local temperature gradient constraint as a second constraint, and executing solidification temperature fitting of the fastest solidification speed;
And determining the solidification cooling auxiliary parameter according to the solidification temperature fitting result.
2. The method of claim 1, wherein the method further comprises:
acquiring a weighted average value of initial temperature loss results under unit time length, and taking the weighted average value as the initial temperature loss of the casting mold;
obtaining a convection temperature difference according to the loss initial temperature and the ambient temperature;
And performing temperature loss fitting of the casting mold through the convection temperature difference, the unit time length and the outer end surface area of the casting mold, and completing initial temperature loss compensation according to the temperature loss fitting result to generate the temperature loss analysis result.
3. The method of claim 1, wherein the method further comprises:
Fitting full time nodes of each cavity through the flow rate fitting result and the mold characteristic set;
calculating the temperature of the castings at the key node positions before solidification through the compensation temperature of full time nodes and continuous nodes;
and (5) completing establishment of a simulated temperature field based on the calculation result of the temperature of the casting at the key node position.
4. The method of claim 1, wherein the method further comprises:
Establishing a multidimensional evaluation fitness function of solidification and cooling control, wherein the multidimensional evaluation fitness function comprises a complexity evaluation fitness function, a stability evaluation fitness function and an realizability evaluation fitness function;
executing cooling auxiliary parameter control evaluation corresponding to the solidification temperature fitting result through the multi-dimensional evaluation fitness function;
And screening according to the control evaluation result to obtain the solidification cooling auxiliary parameter.
5. The method of claim 1, wherein the method further comprises:
establishing a result-oriented compensation network, and carrying out abnormal backtracking analysis on casting production results through the compensation network;
extracting compensation data according to an abnormal backtracking analysis result;
and executing temperature control optimization processing through the compensation data.
6. A temperature control system for casting mold thermal balance analysis, characterized in that the system is for performing a temperature control method for casting mold thermal balance analysis according to any one of claims 1 to 5, the system comprising:
The feature extraction module is used for extracting a die feature set of the casting die, wherein the die feature set is obtained by carrying out feature extraction on structural data after the die structural data of the casting die are obtained through communication, and comprises a shape feature, an inner diameter feature and an inflection point feature;
The identification module is used for carrying out casting fitting on the casting mould, determining casting solidification sequence, and carrying out feature reverse sequence identification on the mould feature set through the casting solidification sequence;
The node establishing module is used for establishing key nodes according to the mold feature set and the feature reverse sequence identification, wherein the key nodes are nodes with temperature loss analysis of father-son node identification;
The temperature loss analysis module is used for reading control parameters of the casting alloy mold filling process, performing node position flow rate fitting of the key nodes based on the control parameters, performing temperature loss analysis based on the key nodes according to a flow rate fitting result and initial alloy liquid temperature, and generating a temperature loss analysis result, wherein the control parameters comprise a liquid lifting speed parameter, a mold filling pressure parameter, a mold filling speed parameter and a crusting time parameter;
The filling type influence evaluation module is used for performing filling type influence evaluation based on the temperature loss analysis result, determining the filling type continuous node compensation temperature, wherein the filling type influence evaluation refers to monitoring the temperature data of the continuous node, and performing temperature compensation in the continuous node based on positive influence evaluation or negative influence evaluation;
the control fitting module is used for establishing a simulated temperature field with the completed filling, performing solidification temperature control fitting of the castings according to the simulated temperature field and the casting solidification sequence, and generating solidification cooling auxiliary parameters based on solidification temperature fitting results;
And the temperature control module is used for carrying out temperature control management on the castings through the continuous node compensation temperature of the filling and the solidification and cooling auxiliary parameters.
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