Combined modular measuring device for casting heat exchange coefficient of cast aluminum alloy and rapid data acquisition method

Abstract

The invention discloses a combined modularized measuring device for casting heat exchange coefficients of cast aluminum alloy and a rapid data acquisition method, various heat exchange coefficients of a cavity and a core material can be acquired at the same time, and stable structural combination is realized through combined modularization of the used materials, separation of the to-be-measured materials by a heat insulation layer and shape design. The modular structure comprises metal type / non-metal type modules with different sizes and chilling modules. And each module can be replaced according to the material used by the mold cavity and the mold core. According to the invention, various casting environments can be integrated, adjustment can be carried out flexibly and conveniently according to the corresponding environments, heat exchange coefficients in various environments can be obtained at the same time, the measurement time of the heat exchange coefficients is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the field of aluminum alloy casting process design, and in particular, is a method for obtaining the heat transfer coefficient required for aluminum alloy casting process design, and in particular, a method for obtaining a reliable heat transfer coefficient under a variety of casting conditions. Specifically, it is a method for quickly obtaining the heat transfer coefficient within the solidification temperature range by combining modularization of the heat transfer coefficient of aluminum alloy casting. Background Art

[0002] Cast aluminum alloys, such as aluminum (Al)-silicon (Si), aluminum (Al)-copper (Cu) and aluminum (Al)-zinc (Zn), are the most widely used type of aluminum alloys and are highly favored for their excellent performance. At the same time, under the existing process conditions, the alloy can be endowed with good strength, toughness and plasticity, and can withstand large loads without brittle cracking, becoming an indispensable and important material in modern manufacturing.

[0003] In the casting process, the heat transfer coefficient is a key parameter that has a profound impact on the quality, performance and production efficiency of the casting. The heat transfer coefficient defines the ability of the material in the heat conduction process. Specifically, it expresses the relationship between the amount of heat passing through a unit area per unit time and the temperature difference. In the casting process, a higher heat transfer coefficient can accelerate the cooling of the metal, allowing the casting to reach a solid state faster. The increase in cooling rate not only helps to shorten the production cycle, but also improves the microstructure of the casting, enhancing its strength and hardness. However, casting defects related to the cooling rate can also be caused by high heat transfer coefficients. The heat transfer coefficient must also be fully considered in mold design. The material, shape and thickness of the mold will affect the efficiency of heat conduction. When designing the mold, the designer must choose the right material and structure to ensure that the mold can effectively conduct heat and avoid mold damage caused by overheating or casting defects caused by uneven cooling. Uneven cooling rates can easily lead to defects such as cracks and shrinkage holes. By properly managing the heat transfer coefficient, more uniform cooling can be achieved, the probability of defects can be reduced, and the quality and reliability of the casting can be improved. Reasonable casting heat transfer coefficient can improve the reliability of the conclusions of numerical simulation and finite element simulation of casting process, so as to find the best pouring temperature, cooling time and mold design parameters more efficiently, thereby improving production efficiency, reducing energy consumption and achieving higher economic benefits. Especially in the production of high-performance castings, effectively managing and optimizing the heat transfer coefficient by selecting suitable mold materials and matching reasonable cooling conditions is the key to improving product quality and production efficiency in the foundry industry.

[0004] The casting process is an extremely large process system. From the perspective of the raw materials used, it can be divided into metal mold casting, sand mold casting, etc., and from the perspective of the process, it can be divided into gravity casting, pressure casting, centrifugal casting, etc., plus the newly developed composite casting process, the raw materials used and the process control are different, which puts more stringent requirements on the setting of the heat transfer coefficient during process simulation and optimization, and design. For example, patent CN203409212 discloses a heat transfer coefficient measurement device between the ingot and the cooling water in the semi-continuous casting process of aluminum alloy; patent CN109856183 discloses a method and device for determining the heat transfer coefficient of the solid-liquid interface of metal mold differential pressure casting; CN112464398 discloses a method for establishing a four-dimensional interface heat transfer coefficient model for the casting process. These methods can provide corresponding heat transfer coefficient determination methods for specific casting environments. However, the processes of modern casting processes are diverse and the environmental structures are complex. Therefore, it is necessary to develop a method for measuring the casting heat transfer coefficient that can quickly obtain multiple environments to improve the practicality and production efficiency of the casting process. Summary of the invention

[0005] Purpose of the invention: In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a combined modular measuring device and a method for rapid data acquisition for the heat transfer coefficient of casting aluminum alloys. By simultaneously analyzing the solidification temperature curves in the solidification temperature range under multiple environments, and with the aid of a universal heat transfer coefficient inverse calculation module, multiple heat transfer coefficients can be simultaneously acquired. The present invention is different from the heat transfer coefficient determination method for a specific casting process environment. Instead, it is a combined modularization that integrates multiple casting environments and can be flexibly adjusted according to the corresponding environment to simultaneously acquire the heat transfer coefficients under multiple environments. On the other hand, due to the integration of the environment, the measurement time of the heat transfer coefficient is shortened and the work efficiency is improved.

[0006] Technical solution: A combined modular measuring device for heat transfer coefficient of aluminum alloy casting, including 4 parts: metal mold / non-metal mold module I, another size of metal mold / non-metal mold module II, support contact module and quenching module, and the rest is the casting cavity; Each module is determined according to the casting environment. Each module can be replaced according to the materials used in the cavity and core. The module is not a homogeneous whole, but is composed of a variety of materials. The module can be divided into several areas according to the materials used, and each area is separated by an insulation layer; The insulation layer is made of insulating zirconia or alumina foam ceramic material, and the thickness of a single layer is 5%-10% of the thickness of the module. The insulation layer is in an I-shape and is combined with each part of the material to be tested using high-temperature glue to ensure a stable combination between the parts and prevent the melt from leaking out. Each module contains a temperature sensor, and a wired sensor or a wireless sensor can be used to obtain a temperature curve according to actual conditions. The quenching module is made of a single material and can be provided with 1-2 temperature sensors.

[0007] A method for quickly acquiring data according to the combined modular determination device for casting heat transfer coefficient of aluminum alloy casting comprises the following steps: Step 1: Arrange the temperature sensors of the measuring device according to their positions, which are evenly distributed in the thickness direction and in the middle of the width direction of each area to be measured. The number of thermocouples can also be adjusted according to actual conditions, but the spacing must be uniform; Step 2: According to the number of temperature measuring sensors in step 1, a universal temperature acquisition instrument is used to collect temperature data; Step 3, perform a casting experiment: select the aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step 4: Draw a solidification temperature curve based on the data collected in step 3, and calculate the heat transfer coefficient using the back calculation module provided by the commercial software; Step 5: Use the solidification temperature curve in step 4 and use commercial casting simulation software and the convection model and its corresponding empirical formula Nu = 0.023 × Re 0.8 Pr 0.4 , Nu, Re and Pr are Nusselt number, Reynolds number and Prandtl number respectively, and the heat transfer coefficient is calculated; Step 6: Verify the back-calculated results in step 5 with the experimental data. If there is any inconsistency, adjust the empirical formula parameters or the numerical calculation process.

[0008] As an optimization: solidification temperature curves within solidification temperature ranges under various environments are simultaneously obtained, and various heat transfer coefficients can be obtained simultaneously.

[0009] As an optimization: During the test, each material to be tested is separated by an insulating layer.

[0010] As an optimization: adopt combined modularization, integrate multiple casting environments, and be able to flexibly adjust according to the corresponding environment, while obtaining the heat transfer coefficient under multiple environments.

[0011] As an optimization: adopt modular combination and use high temperature glue to combine with each part of the material to be tested.

[0012] Beneficial effects: The present invention forms a test module according to the materials used for the cavity, core and quench body. Each material to be tested is separated by insulating foam ceramics to avoid temperature errors caused by heat conduction between the materials to be tested. At the same time, the solidification temperature curves in the solidification temperature range under various environments are collected, and the heat transfer coefficients of various materials and various environments are obtained with the help of a universal heat transfer coefficient inverse calculation module. The present invention is different from the heat transfer coefficient determination method for a specific casting process environment. It is a combined modularization that integrates a variety of casting environments and can be flexibly adjusted according to the corresponding environment to obtain the heat transfer coefficients under a variety of environments. On the other hand, due to the integration of the environment, the heat transfer coefficient determination time is shortened and the work efficiency is improved. The present invention does not involve the discharge of waste gas, waste water, etc., and will not pollute the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram (a) and a cross-sectional view (b and c) of the measuring device; a metal type / non-metal type module I (1 and 2); another size metal type / non-metal type module II (3 and 4); a supporting contact module (5); and a quenching module (6); Figure 2 Schematic diagram of the thermal insulation layer arrangement in Example 1; Figure 3 Thermocouple layout diagram in Example 1, (a) side view, (b) front view; Figure 4 Example 1 obtained data and fitting result diagram (the dotted line is the fitting result); Figure 5 Example 3 obtained data and fitting result diagram (the dotted line is the fitting result); Figure 6 The data obtained in Example 5 and the fitting result diagram (the dotted line is the fitting result). DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below so that those skilled in the art can better understand the advantages and features of the present invention, thereby making a clearer definition of the protection scope of the present invention. The embodiments described in the present invention are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Example

[0015] A combined modular measuring device and data rapid acquisition method for casting heat transfer coefficient of aluminum alloy casting, comprising the following steps: Step (1) Designing a device according to the full metal mold gravity casting process: the device size is 480 mm × 480 mm × 360 mm. Figure 1 The size of the metal mold modules 1 and 2 in a is 240 mm × 220 mm × 50 mm, and they are composed of three parts, namely ductile iron QT500, ductile iron QT450 and 45 steel. The insulation layer is made of 4 mm thick insulating zirconia foam ceramics processed into an I-shape, and combined with each part of the material to be tested using high-temperature glue. Figure 1 Modules II in a, 3 and 4, use thermal insulation zirconia foam ceramics with a thickness of 15 mm. Figure 1 The 5 supporting contact modules in a are thermal insulation zirconia foam ceramics. Figure 1 The 6 chilling modules in a are ductile iron QT500, and the rest are casting cavities; Step (2) Module I Figure 3 Arrange K-type thermocouple; Step (3) collecting temperature data using a universal temperature acquisition instrument according to the number of thermocouples in step 2; Step (4) Casting experiment: Select the A356 aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step (5) drawing a solidification temperature curve based on the data collected in step 4, and calculating the heat transfer coefficient using a back calculation module provided by commercial software; Step (6) uses the solidification temperature curve in step 5 and uses commercial casting simulation software and the convection model and its corresponding empirical formula Nu = 0.023 × Re 0.8 Pr 0.4 (Nu, Re and Pr are Nusselt number, Reynolds number and Prandtl number respectively) to calculate the heat transfer coefficient; Step (7) can further verify the back-calculation result in step 6 with the experimental data. If there is any inconsistency, the empirical formula parameters or the numerical calculation process can be adjusted.

[0016] Example 2 A combined modular measuring device and data rapid acquisition method for casting heat transfer coefficient of aluminum alloy casting, comprising the following steps: Step (1) Designing a device according to the full metal mold gravity casting process: the device size is 480 mm × 480 mm × 360 mm. Figure 1 The size of the metal mold modules 1 and 2 in a is 240 mm × 220 mm × 50 mm, and they are composed of three parts, namely H13 steel, T8 steel and 55 steel. The insulation layer is made of 4 mm thick insulating zirconia foam ceramics processed into an I-shape and combined with each part of the material to be tested using high-temperature glue. Figure 1Modules II in a, 3 and 4, use thermal insulation zirconia foam ceramics with a thickness of 15 mm. Figure 1 The 5 supporting contact modules in a are thermal insulation zirconia foam ceramics. Figure 1 The 6 chilling modules in a are ductile iron QT500, and the rest are casting cavities; Step (2) Module I Figure 3 Arrange K-type thermocouple; Step (3) collecting temperature data using a universal temperature acquisition instrument according to the number of thermocouples in step 2; Step (4) Casting experiment: Select the A380 aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step (5) drawing a solidification temperature curve based on the data collected in step 4, and calculating the heat transfer coefficient using a back calculation module provided by commercial software; Step (6) uses the solidification temperature curve in step 5 and uses commercial casting simulation software and the convection model and its corresponding empirical formula Nu = 0.023 × Re 0.8 Pr 0.4 (Nu, Re and Pr are Nusselt number, Reynolds number and Prandtl number respectively) to calculate the heat transfer coefficient; Step (7) can further verify the back-calculation result in step 6 with the experimental data. If there is any inconsistency, the empirical formula parameters or the numerical calculation process can be adjusted.

[0017] Example 3 A combined modular measuring device and data rapid acquisition method for casting heat transfer coefficient of aluminum alloy casting, comprising the following steps: Step (1) Designing a device according to the full metal mold gravity casting process: the device size is 240 mm × 240 mm × 360 mm. Figure 1 The size of the metal mold modules 1 and 2 in a is 160 mm × 160 mm × 30 mm, and they are composed of three parts, namely ductile iron QT500, ductile iron QT450 and 45 steel. The insulation layer is made of 3 mm thick insulating zirconia foam ceramics processed into an I-shape, and combined with each part of the material to be tested using high-temperature glue. Figure 1 Modules II in a, 3 and 4, use thermal insulation zirconia foam ceramics with a thickness of 15 mm. Figure 1 The 5 supporting contact modules in a are thermal insulation zirconia foam ceramics. Figure 1 The 6 chilling modules in a are ductile iron QT500, and the rest are casting cavities; Step (2) Module I Figure 3 Arrange K-type thermocouple; Step (3) collecting temperature data using a universal temperature acquisition instrument according to the number of thermocouples in step 2; Step (4) Casting experiment: Select the A356.1 aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step (5) drawing a solidification temperature curve based on the data collected in step 4, and calculating the heat transfer coefficient using a back calculation module provided by commercial software; Step (6) uses the solidification temperature curve in step 5 and uses commercial casting simulation software and the convection model and its corresponding empirical formula Nu = 0.023 × Re 0.8 Pr 0.4 (Nu, Re and Pr are Nusselt number, Reynolds number and Prandtl number respectively) to calculate the heat transfer coefficient; Step (7) can further verify the back-calculation result in step 6 with the experimental data. If there is any inconsistency, the empirical formula parameters or the numerical calculation process can be adjusted.

[0018] Example 4 A combined modular measuring device and data rapid acquisition method for casting heat transfer coefficient of aluminum alloy casting, comprising the following steps: Step (1) Designing a device according to the full metal mold gravity casting process: the device size is 240 mm × 240 mm × 360 mm. Figure 1 The size of the metal modules 1 and 2 in a is 160 mm × 160 mm × 30 mm, and they are composed of three parts, namely T2 copper, TC4 titanium alloy and 316 stainless steel. The insulation layer is made of 3 mm thick insulating zirconia foam ceramics processed into an I-shape and combined with each part of the material to be tested using high-temperature glue. Figure 1 Modules II in a, 3 and 4, use thermal insulation zirconia foam ceramics with a thickness of 15 mm. Figure 1 The 5 supporting contact modules in a are QT500 boxes with circulating cooling water. The inner cavity size is 240 mm × 240 mm × 4 mm, which is used for cooling water. The cooling water is pumped in from one side and circulated into the cooling water tank through the other side. Figure 1 The 6 quenching modules in a are T2, and the rest are casting cavities; Step (2) Module I Figure 3 Arrange K-type thermocouple; Step (3) collecting temperature data using a universal temperature acquisition instrument according to the number of thermocouples in step 2; Step (4) Casting experiment: Select the A356 aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step (5) drawing a solidification temperature curve based on the data collected in step 4, and calculating the heat transfer coefficient using a back calculation module provided by commercial software; Step (6) uses the solidification temperature curve in step 5 and uses commercial casting simulation software and the convection model and its corresponding empirical formula Nu = 0.023 × Re 0.8 Pr 0.4 (Nu, Re and Pr are Nusselt number, Reynolds number and Prandtl number respectively) to calculate the heat transfer coefficient; Step (7) can further verify the back-calculation result in step 6 with the experimental data. If there is any inconsistency, the empirical formula parameters or the numerical calculation process can be adjusted.

[0019] Example 5 A combined modular measuring device and data rapid acquisition method for casting heat transfer coefficient of aluminum alloy casting, comprising the following steps: Step (1) Designing a device according to the full metal mold gravity casting process: the device size is 240 mm × 240 mm × 360 mm. Figure 1 The size of the metal mold modules 1 and 2 in a is 160 mm × 160 mm × 30 mm, and they are composed of three parts, namely ductile iron QT500, ductile iron QT450 and 45 steel. The insulation layer is made of 3 mm thick insulating zirconia foam ceramics processed into an I-shape, and combined with each part of the material to be tested using high-temperature glue. Figure 1 Modules II in a, 3 and 4, use thermal insulation zirconia foam ceramics with a thickness of 15 mm. Figure 1 The 5 supporting contact modules in a are QT500 boxes with circulating cooling water. The inner cavity size is 240 mm × 240 mm × 4 mm, which is used for cooling water. The cooling water is pumped in from one side and circulated into the cooling water tank through the other side. Figure 1 In a, the 6 chilling modules are QT500, and the rest are casting cavities; Step (2) Module I Figure 3 Arrange K-type thermocouple; Step (3) collecting temperature data using a universal temperature acquisition instrument according to the number of thermocouples in step 2; Step (4) Casting experiment: Select the ZL205 aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step (5) drawing a solidification temperature curve based on the data collected in step 4, and calculating the heat transfer coefficient using a back calculation module provided by commercial software; Step (6) uses the solidification temperature curve in step 5 and uses commercial casting simulation software and the convection model and its corresponding empirical formula Nu = 0.023 × Re 0.8Pr 0.4 (Nu, Re and Pr are Nusselt number, Reynolds number and Prandtl number respectively) to calculate the heat transfer coefficient; Step (7) can further verify the back-calculation result in step 6 with the experimental data. If there is any inconsistency, the empirical formula parameters or the numerical calculation process can be adjusted.

[0020] Example 6 A combined modular measuring device and data rapid acquisition method for casting heat transfer coefficient of aluminum alloy casting, comprising the following steps: Step (1) Designing a device according to the full metal mold gravity casting process: the device size is 240 mm × 240 mm × 360 mm. Figure 1 The size of the metal mold modules 1 and 2 in a is 160 mm × 160 mm × 30 mm, and they are composed of three parts, namely H13 steel, T8 steel and 55 steel. The insulation layer is made of 3 mm thick insulating zirconia foam ceramics processed into an I-shape and combined with each part of the material to be tested using high-temperature glue. Figure 1 Modules II in a, 3 and 4, use thermal insulation zirconia foam ceramics with a thickness of 15 mm. Figure 1 The 5 supporting contact modules in a are QT500 boxes with circulating cooling water. The inner cavity size is 240 mm × 240 mm × 4 mm, which is used for cooling water. The cooling water is pumped in from one side and circulated into the cooling water tank through the other side. Figure 1 In a, the 6 chilling modules are QT500, and the rest are casting cavities; Step (2) Module I Figure 3 Arrange K-type thermocouple; Step (3) collecting temperature data using a universal temperature acquisition instrument according to the number of thermocouples in step 2; Step (4) Casting experiment: Select the ZL411 aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step (5) drawing a solidification temperature curve based on the data collected in step 4, and calculating the heat transfer coefficient using a back calculation module provided by commercial software; Step (6) uses the solidification temperature curve in step 5 and uses commercial casting simulation software and the convection model and its corresponding empirical formula Nu = 0.023 × Re 0.8 Pr 0.4 (Nu, Re and Pr are Nusselt number, Reynolds number and Prandtl number respectively) to calculate the heat transfer coefficient; Step (7) can further verify the back-calculation result in step 6 with the experimental data. If there is any inconsistency, the empirical formula parameters or the numerical calculation process can be adjusted.

[0021] Example 7 A combined modular measuring device and data rapid acquisition method for casting heat transfer coefficient of aluminum alloy casting, comprising the following steps: Step (1) Designing a device according to the full metal mold gravity casting process: the device size is 480 mm × 480 mm × 360 mm. Figure 1 The size of the metal mold modules 1 and 2 in a is 240 mm × 220 mm × 50 mm, and they are composed of three parts, namely ductile iron QT500, ductile iron QT450 and 45 steel. The insulation layer is made of 4 mm thick insulating zirconia foam ceramics processed into an I-shape, and combined with each part of the material to be tested using high-temperature glue. Figure 1 Modules II 3 and 4 in a are not partitioned and use ductile iron QT500 with a thickness of 15 mm. Figure 1 The 5 supporting contact modules in a are thermal insulation zirconia foam ceramics. Figure 1 In a, the 6 chilling modules are alumina foam ceramics, and the rest are casting cavities; Step (2) Module I Figure 3 Arrange K-type thermocouple; Step (3) collecting temperature data using a universal temperature acquisition instrument according to the number of thermocouples in step 2; Step (4) Casting experiment: Select the A356 aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step (5) drawing a solidification temperature curve based on the data collected in step 4, and calculating the heat transfer coefficient using a back calculation module provided by commercial software; Step (6) using the solidification temperature curve in step 5, and using commercial casting simulation software and according to the convection model, and calculating the Nusselt number Nu according to the model, to calculate the heat transfer coefficient; Step (7) can further verify the back-calculation result in step 6 with the experimental data. If there is any inconsistency, the empirical formula parameters or the numerical calculation process can be adjusted.

[0022] Example 8 A combined modular measuring device and data rapid acquisition method for casting heat transfer coefficient of aluminum alloy casting, comprising the following steps: Step (1) Designing a device according to the full metal mold gravity casting process: the device size is 240 mm × 240 mm × 360 mm. Figure 1 The size of the metal modules 1 and 2 in a is 160 mm × 160 mm × 50 mm, and they are composed of three parts, namely H13 steel, T8 steel and 55 steel. The insulation layer is made of 4 mm thick insulating zirconia foam ceramics processed into an I-shape and combined with each part of the material to be tested using high-temperature glue. Figure 1 Modules II 3 and 4 in a are not partitioned and use T2 copper with a thickness of 50 mm. Figure 1 The 5 supporting contact module in a is made of alumina foam ceramic. Figure 1 In a, the 6 chilling modules are T2 copper, and the rest are casting cavities; Step (2) Module I Figure 3 Arrange K-type thermocouple; Step (3) collecting temperature data using a universal temperature acquisition instrument according to the number of thermocouples in step 2; Step (4) Casting experiment: Select the A380 aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step (5) drawing a solidification temperature curve based on the data collected in step 4, and calculating the heat transfer coefficient using a back calculation module provided by commercial software; Step (6) using the solidification temperature curve in step 5, and using commercial casting simulation software and according to the convection model, and calculating the Nusselt number Nu according to the model, to calculate the heat transfer coefficient; Step (7) can further verify the back-calculation result in step 6 with the experimental data. If there is any inconsistency, the empirical formula parameters or the numerical calculation process can be adjusted.

[0023] The present invention forms a test module according to the materials used for the cavity, core and quench body. Each material to be tested is separated by insulating foam ceramics to avoid temperature errors caused by heat conduction between the materials to be tested. At the same time, the solidification temperature curves in the solidification temperature range under various environments are collected, and the heat transfer coefficients under various materials and various environments are obtained by means of a universal heat transfer coefficient inverse calculation module. The present invention is different from the heat transfer coefficient determination method for a specific casting process environment, but is a combined modularization that integrates various casting environments and can be flexibly adjusted according to the corresponding environment, and the heat transfer coefficients under various environments are obtained at the same time. On the other hand, due to the integration of the environment, the measurement time of the heat transfer coefficient is shortened and the work efficiency is improved. The present invention does not involve the discharge of waste gas, waste water, etc., and will not pollute the environment.

[0024] It should be noted that the embodiments described in the present invention are only used to express the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A combined modular measuring device for casting heat transfer coefficient of aluminum alloy, characterized in that: It consists of 4 parts: metal / non-metal module I, metal / non-metal module II of another size, support contact module and quenching module, and the rest is casting cavity; Each module is determined according to the casting environment. Each module can be replaced according to the materials used in the cavity and core. The module is not a homogeneous whole, but is composed of a variety of materials. The module can be divided into several areas according to the materials used, and each area is separated by an insulation layer; The insulation layer is made of insulating zirconia or alumina foam ceramic material, and the thickness of a single layer is 5%-10% of the thickness of the module. The insulation layer is in an I-shape and is combined with each part of the material to be tested using high-temperature glue to ensure a stable combination between the parts and prevent the melt from leaking out. Each module contains a temperature sensor, and a wired sensor or a wireless sensor can be used to obtain a temperature curve according to actual conditions. The quenching module is made of a single material and can be provided with 1-2 temperature sensors.

2. A method for quickly acquiring data from the combined modular determination device for heat transfer coefficient of cast aluminum alloy according to claim 1, characterized in that: The steps include: Step 1: Arrange the temperature sensors of the measuring device according to their positions, which are evenly distributed in the thickness direction and in the middle of the width direction of each area to be measured. The number of thermocouples can also be adjusted according to actual conditions, but the spacing must be uniform; Step 2: According to the number of temperature measuring sensors in step 1, a universal temperature acquisition instrument is used to collect temperature data; Step 3, perform a casting experiment: select the aluminum alloy required for production, melt it and pour it into the cavity of the temperature measuring device, and prepare to collect temperature data; Step 4: Draw a solidification temperature curve based on the data collected in step 3, and calculate the heat transfer coefficient using the back calculation module provided by the commercial software; Step 5: Use the solidification temperature curve in step 4 and use commercial casting simulation software and the convection model and its corresponding empirical formula Nu = 0.023 × Re 0.8 Pr 0.4 , Nu, Re and Pr are Nusselt number, Reynolds number and Prandtl number respectively, and the heat transfer coefficient is calculated; Step 6: Verify the back-calculated results in step 5 with the experimental data. If there is any inconsistency, adjust the empirical formula parameters or the numerical calculation process.

3. The method for quickly acquiring data of the combined modular determination device for casting heat transfer coefficient of aluminum alloy according to claim 1, characterized in that: The solidification temperature curves within the solidification temperature range under various environments can be obtained simultaneously, and various heat transfer coefficients can be obtained simultaneously.

4. The method for quickly acquiring data of the combined modular determination device for casting heat transfer coefficient of aluminum alloy according to claim 1, characterized in that: During the test, each material to be tested is separated by an insulating layer.

5. The method for quickly acquiring data of the combined modular determination device for casting heat transfer coefficient of aluminum alloy according to claim 1, characterized in that: It adopts combined modularization, integrates a variety of casting environments, and can be flexibly adjusted according to the corresponding environment, while obtaining the heat transfer coefficient under a variety of environments.

6. The method for quickly acquiring data of the combined modular determination device for casting heat transfer coefficient of aluminum alloy according to claim 1, characterized in that: It adopts modular combination and uses high temperature glue to combine with each part of the material to be tested.

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