Real-time temperature measurement system in casting process of titanium alloy casting

Abstract

A real-time temperature measuring system in the casting process of a titanium alloy casting comprises a vacuum furnace and a data collector, a casting system is arranged in the vacuum furnace, a blind plate is embedded in a shell of the vacuum furnace in a sealed mode, a casting model is arranged on the casting system, a plurality of binding posts are inserted in the blind plate in a sealed mode, the binding posts penetrate through the blind plate, and the inner ends of the binding posts extend into a furnace cavity of the vacuum furnace. The binding post is insulated from the blind plate; blind holes are evenly distributed in the outer wall of one side of the casting model, mounting holes are evenly distributed in the outer wall of the other side of the casting model, the mounting holes are communicated with a mold cavity of the casting model, the blind holes and the mounting holes are arranged in a one-to-one correspondence mode, thermocouples are inserted in the blind holes and the mounting holes, graphite sleeves are sleeved on the peripheries of the thermocouples inserted in the mounting holes, and the graphite sleeves are sleeved on the outer wall of the casting model. A probe of the thermocouple extends out of the inner end of the graphite sleeve, and the graphite sleeve and the probe extend into the die cavity together; the inner ends of the binding posts are connected with the thermocouples in a one-to-one correspondence mode, and the outer ends of the binding posts are connected with the data collector which is provided with a grounding end.

Description

Technical Field

[0001] This utility model belongs to the field of thermophysical parameter measurement technology in titanium alloy casting process, and particularly relates to a real-time temperature measurement system for titanium alloy casting process. Background Technology

[0002] Before implementing the casting process for complex structural components, the reliability of the casting scheme must be assessed. However, traditional casting scheme design and optimization rely mainly on engineers' experience, lacking scientific theory for controlling casting quality. Multiple trial productions are required before formal batch production, with continuous improvement of existing processes based on actual results. This trial-and-error approach not only increases product development cycles and enterprise costs but also makes it difficult to maintain stable casting quality, failing to meet the modern enterprise's development requirements of "high efficiency and low energy consumption." At this point, casting solidification CAE simulation technology demonstrates its unique advantages. However, due to significant differences in the initial metallurgical conditions and thermophysical properties of different materials, the simulation results for some products deviate from reality, affecting the overall quality of the castings. Therefore, only by obtaining accurate thermophysical parameters can the accuracy of CAE simulation results be improved. However, due to the inherent characteristics of titanium alloys, their metallurgical and solidification processes must be completed in a vacuum environment, which presents significant challenges to the determination of thermophysical parameters. Summary of the Invention

[0003] This utility model provides a real-time temperature measurement system for the casting process of titanium alloy castings, which accurately measures the thermophysical parameters of the titanium alloy casting process to obtain the temperature-time curves of the titanium alloy material and casting model during the metal solidification and crystallization process, thereby creating conditions for simulating the solidification and crystallization process of titanium alloys using casting solidification CAE technology.

[0004] The technical solution adopted by this utility model is: a real-time temperature measurement system for the casting process of titanium alloy castings, including a vacuum furnace and a data acquisition device. A casting system is provided inside the vacuum furnace. A blind plate is sealed and embedded on the shell of the vacuum furnace. A casting model is provided on the casting system. Several terminals are sealed and inserted on the blind plate. The terminals penetrate the blind plate and their inner ends extend into the furnace cavity of the vacuum furnace, and the terminals are insulated from the blind plate.

[0005] Blind holes are evenly distributed on one side of the outer wall of the casting model, and mounting holes are evenly distributed on the other side of the outer wall. The mounting holes are connected to the mold cavity of the casting model. The blind holes and mounting holes are arranged opposite to each other. Thermocouples are inserted into the blind holes and mounting holes. Thermocouples inserted into the mounting holes are surrounded by graphite sleeves, and the probe of the thermocouple extends out from the inner end of the graphite sleeve, so that the graphite sleeve and the probe extend into the mold cavity together.

[0006] The inner ends of the terminals are connected to the thermocouples one by one, and the outer ends are connected to the data acquisition device, which has a grounding terminal; the data acquisition device monitors and records the temperature-time curves of the titanium alloy material and the casting model in real time during the solidification and crystallization process of the metal.

[0007] The casting model is a graphite mold, and the length of the graphite sleeve extending into the mold cavity is 10-12 mm.

[0008] At least three blind holes and mounting holes are provided in the vertical direction.

[0009] The distance between the bottom of the blind hole and the inner wall of the mold cavity is 5-10 mm.

[0010] The data acquisition device records data once every 0.5-1 second.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This utility model solves the problem of measuring the thermophysical parameters of titanium alloy casting process in a vacuum environment in the prior art, improves the accuracy of simulating the solidification and crystallization process of titanium alloy using casting solidification CAE technology, and realizes the scientific evaluation of titanium alloy casting process. It is of great significance in optimizing titanium alloy casting process, improving the overall quality of titanium alloy castings, reducing the production cycle of titanium alloy castings and enterprise costs.

[0013] 2. This utility model protects the temperature measuring element inserted into the mold cavity with a graphite sleeve to prevent the temperature measuring point from shifting due to molten metal; and the temperature measuring probe extends into the mold cavity so that the temperature measuring point is outside the graphite cooling area, ensuring the accuracy of real-time temperature measurement.

[0014] 3. This utility model has multiple data acquisition channels, which can accurately feed back the temperature change data of the casting and mold during the pouring and solidification process. In addition, the data acquisition device is grounded, which effectively avoids the influence of the working magnetic field of the vacuum solidification furnace on the stability of data acquisition. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional schematic diagram of the casting model structure of this utility model. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-2 The present invention will be described in detail with reference to specific embodiments.

[0018] A real-time temperature monitoring system for the casting process of titanium alloy castings includes a vacuum furnace 1 and a data acquisition unit 4. The vacuum furnace 1 is equipped with a casting system 8. A blind plate 3 is sealed and embedded on the shell of the vacuum furnace 1. A casting mold 2 is set on the casting system 8. A plurality of terminals 6 are sealed and inserted on the blind plate 3. The terminals 6 penetrate the blind plate 3 and their inner ends extend into the furnace cavity of the vacuum furnace 1, and the terminals 6 are insulated from the blind plate 3. Specifically, the terminals 6 are provided with a silicone insulating layer.

[0019] Blind holes 2-1 are evenly distributed on one side of the outer wall of the casting model 2, and mounting holes 2-2 are evenly distributed on the other side of the outer wall. The mounting holes 2-2 are connected to the mold cavity of the casting model 2. The blind holes 2-1 and the mounting holes 2-2 are arranged opposite to each other. Thermocouples 5 are inserted into both blind holes 2-1 and mounting holes 2-2. Thermocouples 5 inserted in mounting holes 2-2 are surrounded by graphite sleeves 7, and the probe of the thermocouple 5 extends from the inner end of the graphite sleeve 7, so that the graphite sleeve 7 and the probe extend into the mold cavity together. The graphite sleeve protects the temperature measuring element extending into the mold cavity and prevents the temperature measuring point from shifting due to molten metal.

[0020] In this embodiment, the vacuum furnace 1 is preferably a vacuum solidification furnace. The inner ends of the terminals 6 are connected to the thermocouples 5 one-to-one, and the outer ends are connected to the data acquisition unit 4, which has a grounding terminal. The data acquisition unit 4 monitors and records the temperature-time curves of the titanium alloy material and the casting model in real time during the metal solidification process. During operation, the data acquisition unit must be grounded to avoid the strong magnetic field generated by the vacuum solidification furnace body from adversely affecting the stability of the data.

[0021] In the above embodiments, the casting model 2 is preferably a graphite mold, and the graphite sleeve 7 extends into the mold cavity by 10-12 mm, ensuring that the temperature measuring point is outside the graphite chilling region and guaranteeing the accuracy of real-time temperature measurement. Conversely, if the extension length is too short, the temperature measuring point will be in the graphite chilling region, resulting in the measured data being lower than the actual temperature of that node.

[0022] In the above embodiments, in order to accurately collect the temperature changes of the titanium alloy material and the casting model during the metal solidification and crystallization process, at least three blind holes 2-1 and mounting holes 2-2 are provided in the vertical direction, thereby forming multiple sets of data acquisition channels to prevent a single data acquisition channel from failing to accurately feed back temperature change data. It should be noted that the specific number of blind holes 2-1 and mounting holes 2-2 is determined according to the actual structure of the casting model.

[0023] Preferably, the distance between the bottom of the blind hole 2-1 and the inner wall of the mold cavity is 5-10 mm, so as to accurately measure the temperature change data of the casting model during the metal solidification and crystallization process.

[0024] In practical use, the casting model is connected to the casting system, and the grounding connection of the data acquisition unit is checked to ensure it is reliable. Then, the titanium alloy electrode to be melted is suspended inside a vacuum solidification furnace. The furnace is sealed, and a vacuum is created (≤6.67 Pa). The titanium alloy electrode is then melted. After melting, the data acquisition unit is activated, and the molten titanium alloy in the crucible inside the vacuum solidification furnace is injected into the casting model through the casting system. The data acquisition unit records the temperature changes of the casting and mold in real time during pouring and solidification. The data acquisition unit records data every 0.5-1 second until the temperature of the casting and mold drops below 200℃, at which point it is shut down and the original measurement data is exported, obtaining the temperature-time curves of the titanium alloy material and the casting model during the metal filling and solidification process. CAE simulation technology is used to simulate and solve the thermophysical parameters such as thermal conductivity, thermal conductivity, and interfacial heat transfer coefficient during the solidification process of the titanium alloy. Based on the measured temperature-time curves, the simulation results are adjusted and optimized. Then, the casting, metallurgical and solidification processes of titanium alloys are digitally reproduced using simulation technology. The accuracy and reliability of the obtained thermophysical parameters are verified, and relatively ideal thermophysical parameters of titanium alloys can be obtained. This ensures the accuracy of the simulation results of the solidification and crystallization process of titanium alloys, and enables a scientific evaluation of the casting process design. This is of great significance for optimizing the process design, improving the overall quality of castings, reducing product production cycle and enterprise costs.

[0025] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. Therefore, all equivalent variations made based on the content described in the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. A real-time temperature monitoring system for the casting process of titanium alloy castings, comprising a vacuum furnace (1) and a data acquisition unit (4), wherein a casting system (8) is provided inside the vacuum furnace (1), characterized in that: The vacuum furnace (1) is sealed with a blind plate (3), the casting system (8) is provided with a casting model (2), and a number of terminals (6) are sealed on the blind plate (3). The terminals (6) penetrate the blind plate (3) and their inner ends extend into the furnace cavity of the vacuum furnace (1), thus insulating the terminals (6) from the blind plate (3). Blind holes (2-1) are evenly distributed on one side of the outer wall of the casting model (2), and mounting holes (2-2) are evenly distributed on the other side of the outer wall. The mounting holes (2-2) are connected to the mold cavity of the casting model (2). The blind holes (2-1) and mounting holes (2-2) are arranged opposite to each other. Thermocouples (5) are inserted in both the blind holes (2-1) and the mounting holes (2-2). Thermocouples (5) inserted in the mounting holes (2-2) are surrounded by graphite sleeves (7). The probe of the thermocouple (5) extends out from the inner end of the graphite sleeve (7) and the graphite sleeve (7) and the probe extend into the mold cavity together. The inner end of the terminal block (6) is connected to the thermocouple (5) in a one-to-one correspondence, and the outer end is connected to the data acquisition device (4). The data acquisition device (4) has a grounding terminal. The temperature-time curve of the titanium alloy material and the casting model during the solidification and crystallization process of the metal is monitored and recorded in real time through the data acquisition device (4).

2. The real-time temperature measurement system for the titanium alloy casting process according to claim 1, characterized in that: The casting model (2) is a graphite casting mold, and the graphite sleeve (7) extends into the mold cavity for a length of 10-12 mm.

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