Titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere

Abstract

The invention provides a titanium alloy anti-pollution control method suitable for protective atmosphere continuous heat treatment. The method comprises the following steps: constructing a structural model of a protective atmosphere continuous vibration furnace; a parameter control interface is added to the corresponding position in the structure model, the parameter control interface responds to an instruction sent by an interaction control system and adjusts control parameters corresponding to the protective atmosphere continuous vibration furnace, and the adjusting range of the control parameters is within an adjusting threshold value. The method has the beneficial effects that pollution generated in the current market mainstream titanium alloy annealing and solid solution processes can be effectively prevented, the surface quality of the titanium alloy product after heat treatment is improved, and the product can participate in production in a finish machining state.

Description

Technical Field

[0001] The invention belongs to the field of metal processing, and in particular relates to a titanium alloy anti-pollution control method suitable for continuous heat treatment in a protective atmosphere. Background Art

[0002] Compared with the commonly used vacuum heat treatment, titanium alloy protective atmosphere heat treatment can achieve pollution-free, high efficiency, and improved product consistency, thereby achieving the effect of improving product quality. After the titanium alloy is heat treated in protective atmosphere, the surface quality is good and the mechanical properties are improved; Titanium alloy protective atmosphere heat treatment has been mature in foreign countries for many years, but due to the titanium alloy market, equipment prices, technology blockade and other reasons, it was introduced into China around 2010. There are no mature relevant technical standards, equipment, and pollution control technologies in China. The vacuum heat treatment commonly used for titanium alloys in China has inherent principle defects, such as slow transfer time and sub-vacuum atmosphere during the transfer process when water cooling, which leads to the presence of a contamination layer on the surface of the titanium alloy products, making the existing titanium alloy products can only be heat treated in the form of blanks.

[0003] Although titanium alloy protective atmosphere heat treatment is easier to achieve pollution-free than vacuum heat treatment in principle, it is still very difficult in actual production activities. Equipment, airtightness, medium purity, heat treatment process parameters, etc. all have an impact. Summary of the invention

[0004] In view of this, the present invention aims to propose a titanium alloy anti-pollution control method suitable for continuous heat treatment in a protective atmosphere, in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows: A titanium alloy anti-pollution control method suitable for continuous heat treatment in a protective atmosphere, the method comprising: Construct the structural model of the protective atmosphere continuous vibration furnace; A parameter control interface is added to the corresponding position in the structural model, and the parameter control interface responds to the instructions sent by the interactive control system and adjusts the control parameters corresponding to the protective atmosphere continuous vibration furnace, wherein the adjustment range of the control parameters is within the adjustment threshold.

[0006] Furthermore, the structural model includes: A closed furnace, one end of which is connected to the feeding port and is provided with a vibrating cylinder, which pushes the protective atmosphere input into the closed furnace to the other end, the other end of which is connected to the blanking port, and a heating wire is provided on the outside of the closed furnace; The end of the material drop opening away from the closed furnace is located in the water tank, and the liquid in the water tank covers the material drop opening, forming a water seal in the material drop opening.

[0007] Furthermore, the protective atmosphere used in the method is: Argon gas, wherein the purity of the argon gas is not less than 99.999% and the dew point of the argon gas is not higher than -62°C.

[0008] Furthermore, the liquid in the water tank is: Pure water, which is alkaline with a pH value between 8 and 10, is used to reduce corrosion on metal surfaces; The temperature of the pure water is between 10 and 18 degrees Celsius, which is used to control the quenching cooling rate.

[0009] Furthermore, the adjustment threshold includes: Sealed furnace leakage rate: To stabilize the protective atmosphere in the sealed furnace, the static leakage rate is controlled to be no more than 3600Pa / h, the dynamic leakage rate is controlled to be no more than 5400Pa / h, and the furnace pressure fluctuation during vibration is controlled to be no more than 1800Pa; Seal the furnace temperature and uniformity, control the temperature between 800 and 900 degrees Celsius, and adjust the furnace temperature uniformity between plus or minus 5 degrees Celsius; The quenching time is long. In order to reduce the impact of oxidation under high temperature, the time for the product to enter the water tank from the sealed furnace through the blanking port is controlled to be no more than 2 seconds.

[0010] The volume of the sealed furnace is further controlled to be no greater than 0.8×0.8×3.14×5.5 cubic meters.

[0011] Furthermore, the control interface includes: Atmosphere sensor, which detects the purity and dew point of argon gas, is installed at the gas input interface; Temperature sensors are installed on the furnace wall, furnace bottom and central area of ​​the sealed furnace to monitor the uniformity of the furnace temperature; Pressure sensors are used to monitor the gas pressure inside the sealed furnace, as well as static and dynamic leakage rates, and to detect furnace pressure fluctuations during vibration in real time.

[0012] Furthermore, the control interface also includes: Atmosphere control actuator, used to control the regulation of argon gas flow, adjust the argon gas input according to the data of the atmosphere sensor, and maintain the purity and dew point of the atmosphere within the preset range; The heating actuator controls the power output of the heating element, controls the sealed furnace temperature to be within the regulation threshold, and makes adjustments based on the data fed back by the temperature sensor; The pressure control actuator dynamically adjusts the pressure based on the feedback from the pressure sensor.

[0013] Furthermore, the interactive control system includes: The atmosphere, temperature and pressure data are collected in real time through sensors and analyzed. When the data fluctuates greatly or exceeds the adjustment threshold, instructions are sent to the corresponding control interface for adjustment and an alarm signal is issued.

[0014] Furthermore, the interactive control system further includes: Visualization and recording functions display the change curves and historical data of each parameter in real time for process monitoring and data analysis.

[0015] Compared with the prior art, the titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere described in the present invention has the following beneficial effects: It can effectively prevent the mainstream titanium alloys on the market from being contaminated during the annealing and solution treatment process, and improve the surface quality of titanium alloy products after heat treatment. After solution treatment, the thickness of the contamination layer is detected to be 0 under a 500x metallographic microscope, so that the product can participate in production in a finished state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the protective atmosphere vibration continuous furnace mechanism according to an embodiment of the present invention; Figure 2 Schematic diagram of metallographic detection of TC4 material after solutionizing in a conventional vacuum furnace according to an embodiment of the present invention; Figure 3 It is a schematic diagram of metallographic detection of TC4 material after continuous heat treatment with protective atmosphere vibration in an embodiment of the present invention with an excessive leakage rate; Figure 4 This is a schematic diagram of metallographic detection of TC4 material after continuous heat treatment with vibration in normal protective atmosphere as described in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0019] like Figure 1-4 As shown: A titanium alloy anti-pollution control method suitable for continuous heat treatment in a protective atmosphere, the method comprising: Construct the structural model of the protective atmosphere continuous vibration furnace; A parameter control interface is added to the corresponding position in the structural model, and the parameter control interface responds to the instructions sent by the interactive control system and adjusts the control parameters corresponding to the protective atmosphere continuous vibration furnace, wherein the adjustment range of the control parameters is within the adjustment threshold.

[0020] The structural model includes: A closed furnace, one end of which is connected to the feeding port and is provided with a vibrating cylinder, which pushes the protective atmosphere input into the closed furnace to the other end, the other end of which is connected to the blanking port, and a heating wire is provided on the outside of the closed furnace; The end of the material drop opening away from the closed furnace is located in the water tank, and the liquid in the water tank covers the material drop opening, forming a water seal in the material drop opening.

[0021] The protective atmosphere used in the method is: Argon, the purity of the argon is not less than 99.999%, and the dew point of the argon is not higher than -62°C. The above requirements are higher than the requirements for argon dew point in domestic and international titanium alloy heat treatment standards. The purity of argon is the national standard requirement at the time of supply, and the dew point of argon mainly reflects whether the argon gas in the entire atmosphere system has emptied other impurities such as air and moisture to meet the requirements.

[0022] The liquid in the water tank is: Pure water, which is alkaline with a pH value between 8 and 10, is used to reduce corrosion on metal surfaces; The temperature of the pure water is between 10 and 18 degrees Celsius, which is used to control the quenching cooling rate. The above water temperature requirements are more stringent than the general titanium alloy heat treatment specifications. Too high or too low water temperature will cause an imbalance in the argon pressure in the overall system, thereby causing the failure of the practice of this control method.

[0023] The adjustment thresholds include: Sealed furnace leakage rate: To stabilize the protective atmosphere in the sealed furnace, the static leakage rate is controlled to be no more than 3600Pa / h, the dynamic leakage rate is no more than 5400Pa / h, and the furnace pressure fluctuation during vibration is no more than 1800Pa. All data of the leakage rate test are derived from production practice and are consistent with the heating volume of the equipment. Seal the furnace temperature and uniformity, control the temperature between 800 and 900 degrees Celsius, and adjust the furnace temperature uniformity between plus or minus 5 degrees Celsius; The quenching time is long. In order to reduce the impact of oxidation under high temperature, the time for the product to enter the water tank from the sealed furnace through the blanking port is controlled to be no more than 2 seconds. This requirement is much higher than the general titanium alloy heat treatment standard requirements. This is also the biggest advantage of the atmosphere continuous heat treatment furnace compared to the traditional vacuum furnace.

[0024] The volume of the sealed furnace is controlled to be no larger than 0.8×0.8×3.14×5.5 cubic meters.

[0025] The control interface comprises: Atmosphere sensor, which detects the purity and dew point of argon gas, is installed at the gas input interface; Temperature sensors are installed on the furnace wall, furnace bottom and central area of ​​the sealed furnace to monitor the uniformity of the furnace temperature; Pressure sensors are used to monitor the gas pressure inside the sealed furnace, as well as static and dynamic leakage rates, and to detect furnace pressure fluctuations during vibration in real time.

[0026] The control interface also includes: Atmosphere control actuator, used to control the regulation of argon gas flow, adjust the argon gas input according to the data of the atmosphere sensor, and maintain the purity and dew point of the atmosphere within the preset range; The heating actuator controls the power output of the heating element, controls the sealed furnace temperature to be within the regulation threshold, and makes adjustments based on the data fed back by the temperature sensor; The pressure control actuator dynamically adjusts the pressure based on the feedback from the pressure sensor.

[0027] The interactive control system is the core of the control interface. It is responsible for receiving real-time data from sensors and sending instructions to the actuators for adjustment according to the preset parameter threshold range. The system ensures the stability and controllability of the heat treatment process through closed-loop control. The interactive control system includes: The system collects atmosphere, temperature, pressure and other data in real time through sensors, and analyzes and processes the data. When the atmosphere purity or dew point is abnormal, the system will automatically add argon or adjust the gas flow through the atmosphere control actuator to ensure the stability of the atmosphere; if the temperature deviation in a certain area exceeds ±5°C, the system will make local adjustments through the heating actuator to ensure the temperature uniformity in the furnace; the system monitors the furnace pressure in real time, especially during vibration, to ensure that the pressure fluctuation is within 1800Pa. When the pressure fluctuation is too large, the system will automatically release the pressure or replenish the gas.

[0028] When a parameter exceeds the set adjustment range, the system will immediately send out an alarm signal and stop the heat treatment process to ensure safety, for example: When the atmosphere dew point rises above -54°C, the system will immediately alarm and automatically start the gas replenishment program; when the temperature fluctuation exceeds the allowable range (±5°C), the system will reduce the heating power or suspend processing to prevent material damage; when the leakage rate or pressure fluctuation exceeds the set range, the system will issue a warning and try to correct it automatically, while reminding the operator to perform manual inspection.

[0029] The control system should have visualization and recording functions, and display the change curves and historical data of each parameter in real time, so that operators can monitor the process and conduct subsequent analysis and optimization. The system can also predict potential problems based on the trends of historical data, make adjustments in advance, and prevent sudden failures.

[0030] In the traditional double-chamber vacuum water quenching heat treatment, since it is impossible to completely avoid contact with air during the quenching transfer process, the thickness of the continuous and dense α layer after solid solution is generally ≥0.05mm; before the invention of this patent, the thickness of the continuous and dense α layer in the general protective atmosphere continuous heat treatment is generally ≥0.02mm. This application can effectively prevent the current mainstream titanium alloys on the market from being contaminated during annealing and solid solution, and improve the surface quality of titanium alloy products after heat treatment. After solid solution, the thickness of the contamination layer is detected to be 0 under a 500x metallographic microscope, so that the product can participate in production in a finished state.

[0031] Those of ordinary skill in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0032] In the several embodiments provided in the present application, it should be understood that the disclosed methods and systems can be implemented in other ways. For example, the division of the units described above is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. The above-mentioned units may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A titanium alloy anti-pollution control method suitable for continuous heat treatment in a protective atmosphere, characterized in that: The method comprises: Construct the structural model of the protective atmosphere continuous vibration furnace; A parameter control interface is added to the corresponding position in the structural model, and the parameter control interface responds to the instructions sent by the interactive control system and adjusts the control parameters corresponding to the protective atmosphere continuous vibration furnace, wherein the adjustment range of the control parameters is within the adjustment threshold.

2. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 1, characterized in that: The structural model includes: A closed furnace, one end of which is connected to the feeding port and is provided with a vibrating cylinder, which pushes the protective atmosphere input into the closed furnace to the other end, the other end of which is connected to the blanking port, and a heating wire is provided on the outside of the closed furnace; The end of the material drop opening away from the closed furnace is located in the water tank, and the liquid in the water tank covers the material drop opening, forming a water seal in the material drop opening.

3. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 1, characterized in that: The protective atmosphere used in the method is: Argon gas, wherein the purity of the argon gas is not less than 99.999% and the dew point of the argon gas is not higher than -62°C.

4. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 2, characterized in that: The liquid in the water tank is: Pure water, which is alkaline with a pH value between 8 and 10, is used to reduce corrosion on metal surfaces; The temperature of the pure water is between 10 and 18 degrees Celsius, which is used to control the quenching cooling rate.

5. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 2, characterized in that: The adjustment thresholds include: Sealed furnace leakage rate: To stabilize the protective atmosphere in the sealed furnace, the static leakage rate is controlled to be no more than 3600Pa / h, the dynamic leakage rate is controlled to be no more than 5400Pa / h, and the furnace pressure fluctuation during vibration is controlled to be no more than 1800Pa; Seal the furnace temperature and uniformity, control the temperature between 800 and 900 degrees Celsius, and adjust the furnace temperature uniformity between plus or minus 5 degrees Celsius; The quenching time is long. In order to reduce the impact of oxidation under high temperature, the time for the product to enter the water tank from the sealed furnace through the blanking port is controlled to be no more than 2 seconds.

6. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 1, characterized in that: The volume of the sealed furnace is controlled to be no larger than 0.8×0.8×3.14×5.5 cubic meters.

7. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 1, characterized in that: The control interface comprises: Atmosphere sensor, which detects the purity and dew point of argon gas, is installed at the gas input interface; Temperature sensors are installed on the furnace wall, furnace bottom and central area of ​​the sealed furnace to monitor the uniformity of the furnace temperature; Pressure sensors are used to monitor the gas pressure inside the sealed furnace, as well as static and dynamic leakage rates, and to detect furnace pressure fluctuations during vibration in real time.

8. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 7, characterized in that: The control interface also includes: Atmosphere control actuator, used to control the regulation of argon gas flow, adjust the argon gas input according to the data of the atmosphere sensor, and maintain the purity and dew point of the atmosphere within the preset range; The heating actuator controls the power output of the heating element, controls the sealed furnace temperature to be within the regulation threshold, and makes adjustments based on the data fed back by the temperature sensor; The pressure control actuator dynamically adjusts the pressure based on the feedback from the pressure sensor.

9. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 1, characterized in that: The interactive control system comprises: The atmosphere, temperature and pressure data are collected in real time through sensors and analyzed. When the data fluctuates greatly or exceeds the adjustment threshold, instructions are sent to the corresponding control interface for adjustment and an alarm signal is issued.

10. The titanium alloy anti-pollution control method suitable for continuous heat treatment in protective atmosphere according to claim 9, characterized in that: The interactive control system further comprises: Visualization and recording functions display the change curves and historical data of each parameter in real time for process monitoring and data analysis.

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