Method for judging physical properties of ceramic core material

Abstract

The invention provides a method for judging physical properties of a ceramic core material. The method comprises the following steps: determining performance parameters representing the ceramic core as decision variables, and determining physical performance priorities and decision functions of the performance parameters; constructing a comprehensive performance evaluation model based on the weight coefficient and the judgment function; and obtaining test data of the ceramic core, and evaluating and integrating the test data by using the comprehensive performance evaluation model to obtain physical performance evaluation data of the ceramic core. According to the scheme, the scientific quantitative evaluation standard of the physical properties of the ceramic core is completed, and the precision of quality evaluation of the ceramic core is improved.

Description

Technical Field

[0001] This application relates to the field of materials technology, and more particularly, to a method for determining the physical properties of a ceramic core material. Background Art

[0002] Ceramic cores play a crucial role in many industries such as aerospace and automotive, especially when manufacturing complex and delicate structures. According to the different matrix materials, aluminum-based, silicon-based, and magnesium-based ceramic cores are widely used. Aluminum-based ceramic cores maintain structural stability during sintering and use, and have good high-temperature resistance, but it is difficult to remove the core during the manufacture of single-crystal blades; the manufacturing process of magnesium-based ceramic cores is simple and the chemical structure is stable, but its magnesium oxide impurities have an impact on the hydration performance and core removal performance; while silicon-based ceramic cores have the advantages of stable high-temperature physical and chemical properties, low thermal expansion coefficient, and high purity, overcoming the disadvantages of the other two materials, so they are widely used.

[0003] The advantages of silicon-based ceramic cores are also reflected in their better mechanical strength and corrosion resistance, enabling them to maintain extremely high stability in complex high-temperature environments. Its low thermal expansion coefficient can not only effectively reduce the deformation caused by temperature changes during the manufacturing process, but also reduce the impact of thermal stress on components under more severe high-temperature conditions, thereby improving the accuracy and reliability of the final product. At the same time, the high purity of the silicon-based ceramic core material makes it have better chemical stability at high temperatures, able to resist the erosion of chemical reactions such as oxidation and sulfidation, thus extending the service life of the core.

[0004] With the continuous development of manufacturing processes, the application fields of silicon-based ceramic core materials are also constantly expanding. Especially in the manufacture of advanced turbine blades, silicon-based ceramic cores can support higher casting accuracy and more complex geometric shape requirements, providing guarantee for manufacturing more efficient and high-performance engine components.

[0005] The superior performance of silicon-based ceramic cores makes them not only perform well in the manufacture of turbine blades, but also show great potential in other high-temperature applications. Especially in high-temperature and high-pressure environments, silicon-based ceramic cores can withstand extreme working conditions and ensure the accuracy of the casting process. With the increasing requirements of turbine engines and high-performance combustion equipment, the stability, strength, and heat resistance of silicon-based ceramic cores make them an ideal material for key components in aeroengines, gas turbines, and the energy field.

[0006] In addition, compared with traditional materials, the production process of silicon-based ceramic cores is more environmentally friendly. Their high purity and excellent chemical stability result in less generation of harmful gases and substances at high temperatures, meeting the high environmental protection standards of modern industry. It can also reduce waste and energy consumption, having unique advantages in green manufacturing and sustainable development.

[0007] The traditional experimental method can only find the optimal solution among a few given experimental quantities, and the result depends to a large extent on the artificially selected level values. Therefore, this method has great limitations and inaccuracies. At the same time, the traditional method of making artificial judgments based on performance parameters lacks certain judgment criteria, and its accuracy and efficiency are both low. Summary of the Invention

[0008] To solve the technical problems existing in the above-mentioned background technology, the present application provides a method for determining the physical properties of a ceramic core material, an electronic device, a computer storage medium, and a computer program product.

[0009] The present application provides a method for determining the physical properties of a ceramic core material, and the method includes:

[0010] Determine the performance parameters characterizing the ceramic core as decision variables, and determine the physical property priority and judgment function of each of the performance parameters; wherein, the performance parameters include shrinkage rate, porosity, bulk density, room temperature bending strength, high temperature bending strength, and high temperature deflection, and the physical property priority is characterized by a weight coefficient.

[0011] Construct a comprehensive performance evaluation model based on the weight coefficient and the judgment function.

[0012] Obtain the test data of the ceramic core, and use the comprehensive performance evaluation model to evaluate and integrate the test data to obtain the physical property evaluation data of the ceramic core.

[0013] Optionally, the physical property priority of each of the performance parameters is specifically:

[0014] The weight coefficient of the shrinkage rate is 0.40 - 0.50; the weight coefficients of the room temperature bending strength and the high temperature bending strength are both 0.15 - 0.25; the weight coefficient of the high temperature deflection is 0.05 - 0.15; the weight coefficients of the porosity and the bulk density are both 0.01 - 0.05.

[0015] Optionally, the judgment function of each of the performance parameters is specifically:

[0016] The judgment function of the shrinkage rate (A) / % is:

[0017]

[0018] The judgment function of the porosity (B) / % is: f B (x) = 100 (x ≤ 10);

[0019]

[0020] The bulk density (C) (g / cm 3) The determination function is:

[0021]

[0022] The determination function for the room temperature strength (D) (MPa) is:

[0023]

[0024] The determination function for the high temperature strength (E) (MPa) is:

[0025]

[0026] The determination function for the high temperature deflection (F) (mm) is:

[0027]

[0028] In the formula, the k value is a change trend factor for adjusting the determination function.

[0029] Optionally, the comprehensive performance evaluation model uses a constraint equation to evaluate and integrate the test data to obtain physical property evaluation data of the ceramic core, and the constraint equation is:

[0030]

[0031] In the formula, Score is the physical property evaluation data, f i (x) is the score of the i-th performance parameter, and W i is the physical property priority of the i-th performance parameter.

[0032] Optionally, the obtaining of the test data of the ceramic core includes:

[0033] Obtain multiple groups of test data of the ceramic core with a specific formula, detect the scores of the test shrinkage rate, test porosity, test bulk density, test room temperature flexural strength, test high temperature flexural strength, and test high temperature deflection, and respectively calculate the average values of these scores to obtain the final scores of the shrinkage rate, porosity, bulk density, room temperature flexural strength, high temperature flexural strength, and high temperature deflection.

[0034] Optionally, the method further includes:

[0035] Determine the actual firing temperature range during the firing process corresponding to multiple groups of the test data, and find the union of each actual firing temperature range to obtain the maximum temperature range; wherein, the actual firing temperature range is within the preset acceptable temperature range, and the fired ceramic cores corresponding to each test data are determined to be qualified;

[0036] Determine the intervention coefficient based on the difference between the upper limit value and the lower limit value of the maximum temperature range, and use the intervention coefficient to correct the physical property evaluation data.

[0037] Optionally, the ceramic core selects high-purity quartz glass powder as the matrix material, and the mineralizer selects aluminum silicate fiber, which is divided into multiple groups according to different addition amounts, that is, each group constitutes a specific formula.

[0038] This application also provides an electronic device, which includes: a memory storing executable program code; a processor coupled to the memory; the processor calls the executable program code stored in the memory and executes the method described in any one of the previous items.

[0039] This application also provides a computer storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method described in any one of the previous items.

[0040] This application also provides a computer program product, including a computer program stored on a non-transitory computer-readable medium, and the computer program implements the method described in any one of the previous items when executed by a processor.

[0041] The beneficial effects of the present invention are as follows:

[0042] The solution of the present invention completes the scientific quantitative evaluation standard for the physical properties of ceramic cores, and improves the accuracy of the quality evaluation of ceramic cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 It is a schematic flowchart of a method for determining the physical properties of a ceramic core material disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0046] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0047] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0048] In the description of the present application, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is usually placed during use, it is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0049] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0050] Please refer to Figure 1 , an embodiment of the present application discloses a method for determining the physical properties of a ceramic core material, and the method includes:

[0051] Determine the performance parameters characterizing the ceramic core as decision variables, and determine the physical property priorities and judgment functions of each of the performance parameters; wherein, the performance parameters include shrinkage rate, porosity, bulk density, room temperature bending strength, high temperature bending strength, and high temperature deflection, and the physical property priorities are characterized by weight coefficients.

[0052] Construct a comprehensive performance evaluation model based on the weight coefficients and the judgment functions.

[0053] Obtain the test data of the ceramic core, and use the comprehensive performance evaluation model to evaluate and integrate the test data to obtain the physical property evaluation data of the ceramic core.

[0054] There are various types of parameter properties of the ceramic core material, including shrinkage rate, porosity, bulk density, room temperature bending strength, high temperature bending strength, and high temperature deflection, and these performance parameters directly affect the final yield of the core. Among them:

[0055] 1) The shrinkage rate is an important indicator to measure the volume change of ceramic cores during sintering, directly affecting the matching degree between the core and the casting. Since ceramic cores will experience varying degrees of volume shrinkage during sintering, if the shrinkage rate is too high, it will cause a mismatch between the core and the casting, forming gaps and thus affecting the accuracy of the core and the casting during the casting process.

[0056] 2) The porosity directly relates to the mechanical properties of the core. If the porosity is too high, the internal pore structure of the core is uneven, resulting in a decline in the mechanical properties of the ceramic core. A relatively high porosity may cause the core to crack or deform easily under high-temperature or high-pressure environments, affecting the quality of the casting.

[0057] 3) The bulk density reflects the proportional relationship between the solid part and the voids in the ceramic core. The higher the bulk density, the greater the strength and better the heat resistance of the ceramic core. Changes in bulk density not only affect the mechanical properties of the core but also directly impact its thermal conductivity and wear resistance.

[0058] 4) The room-temperature flexural strength refers to the ability of the ceramic core to resist bending stress under room-temperature conditions and is one of the key indicators for evaluating the mechanical properties of ceramic core materials, affecting the reliability of the core during the casting process. The higher the room-temperature flexural strength, the less likely the ceramic core is to break during processing and the greater the mechanical stress it can withstand without breaking.

[0059] 5) The high-temperature flexural strength refers to the bending strength of the ceramic core in a high-temperature environment, which determines whether the ceramic core can maintain its structural stability and mechanical strength during high-temperature casting. As the temperature rises, the mechanical properties of ceramic core materials generally decline. Excellent performance in high-temperature flexural strength means that the ceramic core can still maintain relatively high strength and stability under extreme working conditions. For high-performance ceramic cores in industries such as aerospace and automotive, especially in high-temperature casting, it is necessary to ensure that they have sufficient high-temperature flexural strength to guarantee the reliability of the core during high-temperature operations.

[0060] 6) The high-temperature deflection is an important indicator to measure the anti-deformation ability of ceramic cores in a high-temperature environment. As the temperature rises during the casting process, the ceramic core will undergo certain thermal expansion and deformation, especially when subjected to external forces. The ability of high-temperature deflection determines whether the core can maintain its shape and effectively support the casting. If the high-temperature deflection is too low, the ceramic core is prone to bending or deformation at high temperatures, resulting in a decline in the accuracy of the casting. Therefore, the high-temperature deflection directly affects the stability and reliability of the ceramic core during high-temperature casting.

[0061] The solution of the present invention has completed a scientific quantitative evaluation standard for the physical properties of ceramic cores, improving the accuracy of the quality evaluation of ceramic cores.

[0062] Optionally, the physical performance priorities of the performance parameters are specifically as follows:

[0063] The weight coefficient of the shrinkage rate is 0.40 - 0.50; the weight coefficients of the room temperature bending strength and the high temperature bending strength are both 0.15 - 0.25; the weight coefficient of the high temperature deflection is 0.05 - 0.15; the weight coefficients of the porosity and the bulk density are both 0.01 - 0.05.

[0064] In the embodiments of the present application, the shrinkage rate reflects the dimensional stability, accuracy and reliability of the material during the sintering process and high temperature applications, which is the most important performance parameter, and the weight coefficient is 0.40 - 0.50; the high temperature bending strength and the room temperature bending strength reflect the mechanical properties of the material, and are used as secondary performance parameters, with the weight set to 0.15 - 0.25; the high temperature deflection reflects the anti-deformation ability of the material at high temperatures, and is set as the third priority with the weight of 0.05 - 0.15, and the other parameters are set with the weight of 0.01 - 0.05, and the total weight number is 1.

[0065] Optionally, the determination functions of the performance parameters are specifically as follows:

[0066] The determination function of the shrinkage rate (A) / % is:

[0067]

[0068] The determination function of the porosity (B) / % is: f B (x) = 100 (x ≤ 10);

[0069]

[0070] The determination function of the bulk density (C) (g / cm 3 ) is:

[0071]

[0072] The determination function of the room temperature strength (D) (MPa) is:

[0073]

[0074] The determination function of the high temperature strength (E) (MPa) is:

[0075]

[0076] The determination function of the high temperature deflection (F) (mm) is:

[0077]

[0078] In the formula, the k value is a change trend factor for adjusting the determination function.

[0079] Optionally, the comprehensive performance evaluation model uses a constraint equation to evaluate and integrate the test data to obtain physical property evaluation data of the ceramic core, and the constraint equation is:

[0080]

[0081] In the formula, Score is the physical property evaluation data, and f i (x) is the score of the i-th performance parameter, and W i is the physical property priority of the i-th performance parameter.

[0082] Optionally, the obtaining of the test data of the ceramic core includes:

[0083] Obtain multiple groups of test data of the ceramic core with a specific formula, detect the scores of the test shrinkage rate, test porosity rate, test bulk density, test room temperature bending strength, test high temperature bending strength, and test high temperature deflection, and respectively calculate the average values of these scores to obtain the final scores of the shrinkage rate, porosity rate, bulk density, room temperature bending strength, high temperature bending strength, and high temperature deflection.

[0084] In the embodiments of the present application, to ensure data accuracy, the above performance parameters of the ceramic core with a single formula are measured multiple times respectively. The score of each performance parameter reflects the importance of the parameter in the overall performance of the material, and the higher the score, the more the performance meets the expected standard; then, calculate the average value of multiple values of the same performance parameter, that is, obtain the final score of each performance parameter.

[0085] By comparing the scoring results of different formulas, it is possible to effectively identify which mineralizer addition amounts can improve the overall performance of the ceramic core material. Through this evaluation, the optimal mineralizer addition amount can be selected to ensure excellent performance of the material in different application environments. For example, by comparing the scores under different addition amounts of aluminosilicate fiber, determine the optimal addition amount with the best performance. By comparing the performance scores under different addition amounts of aluminosilicate fiber, the optimal mineralizer addition amount can be scientifically determined, thereby improving the performance of the ceramic core material and enabling it to reach a higher quality standard in practical applications.

[0086] The present invention realizes a scientific quantitative evaluation standard for the physical properties of the ceramic core, improves the accuracy of the quality evaluation of the ceramic core, and can realize the performance comparison and evaluation between ceramic core materials with different compositions. Through the method of the present invention, the applicability of the material can be more accurately evaluated, the production process of the ceramic core material can be further optimized, and a theoretical basis can be provided for the design of the ceramic core.

[0087] Optionally, the method further includes:

[0088] Determine the actual firing temperature ranges during the firing process corresponding to multiple sets of the test data, and take the union of each of the actual firing temperature ranges to obtain the maximum temperature range; wherein, the actual firing temperature ranges are within the preset acceptable temperature range, and the fired ceramic cores corresponding to each of the test data are determined to be qualified.

[0089] Determine the intervention coefficient according to the difference between the upper limit value and the lower limit value of the maximum temperature range, and use the intervention coefficient to correct the physical property evaluation data.

[0090] In the embodiments of the present application, the ceramic core needs to be within a suitable temperature range. For example, quartz glass is the main material of the silicon-based ceramic core, and its firing temperature is generally between 1100 - 1250 °C. Limited by the control accuracy of the temperature control system, the actual temperature ranges at which each ceramic core is fired are different (but still within the acceptable temperature range, such as 1100 - 1250 °C), but the fired ceramic cores may be qualified. For this situation, the present invention statistically analyzes the actual firing temperature ranges during the firing process of all the ceramic cores determined to be qualified. These actual firing temperature ranges are slightly different; then, calculate the union of these actual firing temperature ranges to obtain the maximum temperature range of the ceramic cores corresponding to multiple sets of the test data (which is still within the acceptable temperature range); then, calculate the difference between the upper limit value and the lower limit value. The larger this difference is, the higher the product yield rate of this formula can be achieved within a larger temperature range. On the contrary, it indicates that this formula can only achieve the product yield rate within a smaller temperature range.

[0091] When the difference is larger, the present invention sets a larger intervention coefficient and uses this intervention coefficient to appropriately increase the physical property evaluation data (such as Score, for example, 1.1, 1.2) corresponding to the ceramic core of this formula, so as to highlight the performance advantage of the temperature adaptation range of this formula during firing; when the difference is smaller, the present invention sets a smaller intervention coefficient and uses this intervention coefficient to increase the physical property evaluation data (such as Score, for example, 1.0, 0.9) corresponding to the ceramic core of this formula by a smaller margin or even appropriately decrease it, so as to highlight the performance disadvantage of the temperature adaptation range of this formula during firing.

[0092] In addition, the original physical property evaluation data and the corrected physical property evaluation data can also be output together for relevant personnel to refer to and compare. In addition, the maximum temperature range can also be set to be output together. The present invention does not make specific limitations on this. When comparing ceramic cores with different formulas, the corrected physical property evaluation data described above can be referred to.

[0093] Optionally, the ceramic core selects high-purity quartz glass powder as the matrix material, and the mineralizer selects aluminum silicate fiber, which is divided into multiple groups according to different addition amounts, that is, each group constitutes a specific formula.

[0094] By selecting different addition amounts of the mineralizer, the optimization and adjustment of the performance of the ceramic core can be achieved.

[0095] This application also provides an electronic device, which includes: a memory storing executable program code; a processor coupled to the memory; the processor calls the executable program code stored in the memory and executes the method as described in any one of the preceding items.

[0096] This application also provides a computer storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method as described in any one of the preceding items.

[0097] This application also provides a computer program product, including a computer program stored on a non-transitory computer-readable medium, and the computer program implements the method as described in any one of the preceding items when executed by a processor.

[0098] This application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of this application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0099] These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0100] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide for implementing the specified functions in Figure 1One process or multiple processes and / or boxes Figure 1 Steps of functions specified in one box or multiple boxes.

[0101] As described above, the above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for determining the physical properties of a ceramic core material, characterized in that: The method comprises: Determine performance parameters characterizing the ceramic core as decision variables, and determine the physical property priority and judgment function of each performance parameter; wherein the performance parameters include shrinkage, porosity, bulk density, room temperature flexural strength, high temperature flexural strength and high temperature deflection, and the physical property priority is characterized by a weight coefficient; Constructing a comprehensive performance evaluation model based on the weight coefficient and the determination function; The test data of the ceramic core is obtained, and the test data is evaluated and integrated using the comprehensive performance evaluation model to obtain the physical performance evaluation data of the ceramic core.

2. The method for determining the physical properties of a ceramic core material according to claim 1, characterized in that: The physical performance priority of each performance parameter is specifically: The weight coefficient of shrinkage is 0.40-0.50; the weight coefficients of room temperature flexural strength and high temperature flexural strength are both 0.15-0.25; the weight coefficient of high temperature deflection is 0.05-0.15; the weight coefficients of porosity and volume density are both 0.01-0.

05.

3. The method for determining the physical properties of a ceramic core material according to claim 1, characterized in that: The determination function of each of the performance parameters is specifically: The decision function of shrinkage rate is: The determination function of porosity is: The decision function of volume density is: The judgment function of room temperature strength is: The judgment function of high temperature strength is: The judgment function of high temperature deflection is: In the formula, the k value is the change trend factor for adjusting the judgment function.

4. The method for determining the physical properties of a ceramic core material according to claim 1, characterized in that: The comprehensive performance evaluation model uses a constraint equation to evaluate and integrate the test data to obtain physical performance evaluation data of the ceramic core. The constraint equation is: In the formula, Score is the physical performance evaluation data, f i (x) is the score of the i-th performance parameter, W i is the physical performance priority of the i-th performance parameter.

5. The method for determining the physical properties of a ceramic core material according to claim 1, characterized in that: The method of obtaining the test data of the ceramic core comprises: Multiple groups of test data of ceramic cores with specific formulas are obtained, and the scores of test shrinkage, test porosity, test volume density, test room temperature flexural strength, test high temperature flexural strength and test high temperature deflection are detected. The average values ​​of these scores are respectively calculated to obtain the final scores of shrinkage, porosity, volume density, room temperature flexural strength, high temperature flexural strength and high temperature deflection.

6. The method for determining the physical properties of a ceramic core material according to claim 5, characterized in that: The method further comprises: Determine the actual firing temperature intervals during the firing process corresponding to the plurality of groups of test data, and obtain the maximum temperature range by taking the union of the actual firing temperature intervals; wherein the actual firing temperature interval is within a preset acceptable temperature range, and the fired ceramic cores corresponding to the test data are judged to be qualified; An intervention coefficient is determined according to the difference between the upper limit value and the lower limit value of the maximum temperature range, and the physical property evaluation data is corrected using the intervention coefficient.

7. A method for determining the physical properties of a ceramic core material according to any one of claims 1 to 6, characterized in that: The ceramic core uses high-purity quartz glass powder as the matrix material, and the mineralizer uses aluminum silicate fiber, which is divided into multiple groups according to different addition amounts, that is, each group constitutes a specific formula.

8. An electronic device, characterized in that: The electronic device comprises: a memory storing executable program code; a processor coupled to the memory; the processor calls the executable program code stored in the memory to execute the method according to any one of claims 1-7.

9. A computer storage medium storing a computer program, characterized in that: The computer program is executed by a processor to implement the method according to any one of claims 1 to 7.

10. A computer program product comprising a computer program stored on a non-transitory computer readable medium, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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