A current-assisted aging treatment method and device for real-time feedback of aging performance

Abstract

The present invention discloses a current-assisted aging treatment method for real-time feedback of aging performance, which includes the following steps: during the aging treatment process, when a constant voltage power supply is adopted, a predetermined voltage value is set. If the current in the wire does not change or does not increase to the predetermined current value, the power supply voltage and frequency are adjusted to improve the aging efficiency; when a constant current power supply is adopted, a predetermined voltage value is set. If the voltage across the two ends of the metal strip to be processed does not change or does not drop to the predetermined voltage value, the effective current, frequency, and peak value are adjusted to improve the aging efficiency. The device used in the treatment process includes a current sensor, an oscilloscope, a voltage measuring device, a thermocouple, and a power supply. The power supply is connected to the metal strip to be processed, the oscilloscope is electrically connected to the current sensor; the thermocouple is connected to the metal strip; the voltage measuring device is connected to both ends of the metal strip. The present invention can monitor the voltage or current change in real time, determine the resistance change, and then optimize the aging current parameters.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal aging treatment, and particularly relates to a current-assisted aging treatment method and device for real-time feedback of aging performance. Background Art

[0002] For age-hardening alloys, especially for the long-time aging heat treatment of metal strip materials, it will undoubtedly increase the production cost of metal materials. Applying current, especially pulsed current, to the direct aging treatment of metal strip can reduce the free energy of precipitation phase nucleation by using the current, and improve the aging efficiency. Pulse current treatment of solutionized Cu-3.2Ni-0.75Si, after aging treatment with pulse current density j = 1.34×10 4 A / cm 2 After aging treatment, when the aging time is shortened to 500 s, the conductivity of the alloy is 33.6% IACS and the microhardness is 245 HV ("Effect of Electric Pulse Aging on the Microstructure and Properties of Cu-Ni-Si Alloys" [J]. Liu Suqin, Huang Jinliang, Liu Ping, etc. Journal of Henan University of Science and Technology: Natural Science Edition, 2003(03): 4-6.). When using current for aging treatment, since the adjustable parameters include voltage, effective current value, peak value, frequency, and the temperature generated by the current resistance heat and the treatment time, there are many adjustable parameters, and it is impossible to optimize the current aging process quickly. Summary of the Invention

[0003] Aiming at the problems in the prior art, the present invention provides a current-assisted aging treatment method and device for real-time feedback of aging performance that can improve the aging efficiency.

[0004] The present invention adopts the following technical solutions:

[0005] A current-assisted aging treatment method for real-time feedback of aging performance includes the following steps: When a constant-voltage power supply is used during the current treatment, a predetermined voltage value is set, and the current in the wire is detected. If the resistance decreases during the aging process, the current increases. If the current in the wire does not change or does not increase to the predetermined current value, the power supply voltage and frequency are gradually increased by 5% - 30% to improve the aging efficiency; When a constant-current power supply is used during the current treatment, a predetermined current value is set, and the voltage across both ends of the metal strip line to be treated is detected. According to the change of the voltage, the resistance change of the aging sample is monitored. When the voltage drops significantly, it indicates that the resistance has decreased. If the voltage across both ends of the metal strip line to be treated does not change or does not drop to the predetermined voltage value, the effective current, frequency, and peak value are gradually increased by 5% - 30% to improve the aging efficiency. The method of the present invention judges the final aging effect by observing the changes in the voltage across both ends of the treated sample and the current passing through it, and using the voltage value and current value obtained from samples of the same size that have undergone traditional aging treatment under the same conditions in the same experiment as the reference values for achieving 100% aging performance.

[0006] Further, when a constant-voltage power supply is used, for the current target value of the aging treatment of the metal strip line, refer to the current value of the metal strip line that has been aged and has the same size under the same voltage treatment.

[0007] Further, when a constant-current power supply is used, for the voltage target value of the aging treatment of the metal strip line, refer to the voltage value of the metal strip line that has been aged and has the same size under the same current treatment.

[0008] The method of the present invention uses a power supply that can be controlled by constant voltage or constant current. When performing current aging treatment on metals, corresponding voltage measuring equipment, current measuring instruments, etc. are used to measure the voltage and current of the treated sample. By observing the changes in voltage and current during the aging process, the change in resistance is determined, and thus the aging treatment stage is determined.

[0009] An apparatus using the above-mentioned current-assisted aging treatment method for real-time feedback of aging performance, the apparatus includes a current sensor (1), an oscilloscope (2), a voltage measuring device (3), a thermocouple (4), a power supply (5). The positive pole of the power supply (5) is connected to one end of the metal strip line (6) to be treated through a first wire (7), and the negative pole of the power supply (5) is connected to the other end of the metal strip line (6) to be treated through a second wire (8). The current sensor (1) is connected to the second wire (8), and the oscilloscope (2) is electrically connected to the current sensor (1); The thermocouple (4) is connected to the metal strip line (6) to be treated; One end of the voltage measuring device (3) is connected to the first wire (7), and the other end of the voltage measuring device (3) is connected to the second wire (8). The voltage measuring device (3) is connected in parallel with the metal strip line (6) to be treated.

[0010] Further, the metal strip wire is a copper alloy strip wire, an aluminum alloy strip wire or a steel strip wire, and the copper alloy strip wire, the aluminum alloy strip wire or the steel strip wire is sensitive to the change in resistance during the aging treatment process.

[0011] Further, the power supply (5) is a constant voltage power supply or a constant current power supply. When using a constant voltage or constant current power supply and adopting current aging treatment of the metal, the resistance decreases due to aging during the process, so there is a tendency for the current to increase or the voltage to decrease. The aging treatment stage is determined according to this change.

[0012] Further, the current sensor (1) uses one of a Hall instrument or a Rogowski coil.

[0013] Further, the voltage measuring device (3) uses one of a voltmeter or an oscilloscope.

[0014] Further, the material of the first wire (7) is pure copper, and the cross-sectional area of the copper core of the first wire (7) is 4 to 20 times the cross-sectional area of the metal strip wire (6) to be processed; the material of the second wire (8) is pure copper, and the cross-sectional area of the copper core of the second wire (8) is 4 to 20 times the cross-sectional area of the metal strip wire (6) to be processed; the size of the first wire (7) is the same as the size of the second wire (8). All other parts in contact with the metal strip wire (6) to be processed are made of pure copper. Through this limitation, the shunting of the voltage by the wire can be reduced.

[0015] The beneficial technical effects of the present invention: The present invention is applicable to directly aging the metal strip wire by current and provides real-time feedback on the aging performance. To solve the problem of the large difficulty in adjusting parameters during the aging process of directly treating the metal by current, the present invention monitors the change in current when a constant voltage power supply processes a metal sample or the change in voltage at both ends of a metal sample when a constant current power supply is used according to the characteristic of the change in resistance during the aging process, and monitors the change in resistance during the aging process according to the change in current and voltage. During the current aging treatment of the metal, the present invention can monitor in real time the change in voltage or current caused by the change in resistance, and timely adjust the current parameters to change the aging efficiency according to the target values of voltage and current that should be achieved due to the change in resistance, thereby improving the aging efficiency of adjusting the current parameters. During the aging process, according to the change values of voltage and current every 5 minutes, if the resistance does not change significantly, the current parameters can be adjusted to further improve the aging efficiency. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the device of the present invention. Detailed Embodiments

[0017] The technical solutions of the present invention will be further explained and illustrated below in conjunction with the drawings and specific embodiments.

[0018] Example 1

[0019] Select a cold-rolled C7025 copper alloy strip with a size of 0.2mm * 50mm * 600mm, and use a current with a voltage of 2.8V to process the metal strip. When starting the treatment, the current value passed by the metal strip is 300A. As the heat treatment time increases, the effective current value increases to 340A. That is, as the heat treatment time increases, the resistivity of the metal strip decreases due to age precipitation, indicating that the age effect of this treatment current is significant.

[0020] Example 2

[0021] Select a cold-rolled C7025 copper alloy strip with a size of 0.2mm * 50mm * 600mm, and use an effective current of 300A to process the metal strip. When starting the treatment, the voltage value at both ends of the metal strip is 2.8V. As the heat treatment time increases, the voltage drops to 2.0V. That is, as the heat treatment time increases, the resistivity of the metal strip decreases due to age precipitation, indicating that the age effect of this treatment current is significant.

[0022] Example 3

[0023] Select a cold-rolled C7025 copper alloy strip with a size of 0.2mm * 50mm * 600mm, and use an effective current of 150A to process the metal strip. When starting the treatment, the voltage value at both ends of the metal strip is 1.4V. After 5 minutes of treatment, the voltage drops to 1.3V, indicating that the effect of age heat treatment is not obvious and the effective current value required for age treatment needs to be increased. Increase the current in steps of 30A and observe whether there is an obvious change in the voltage at both ends after 5 minutes of treatment. Otherwise, continue to increase the current. Finally, when the current is adjusted to 250A, there is an obvious change in the voltage before and after heat treatment, indicating that obvious age treatment effect can be obtained by processing the copper alloy at this current.

[0024] Example 4

[0025] Select a cold-rolled C7025 copper alloy strip with a size of 0.2mm * 50mm * 600mm, and use a voltage of 2.0V to process the metal strip. When starting the treatment, the current value passed by the metal strip is 180A. After 5 minutes of treatment, the current rises to 190A, indicating that the effect of age heat treatment of current is not obvious and the voltage value required for age treatment needs to be increased. Increase the voltage in steps of 0.2V and observe whether there is an obvious change in the current passing through the sample after 5 minutes of treatment. Otherwise, continue to increase the voltage. Finally, when the voltage is adjusted to 2.8V, there is an obvious change in the current after heat treatment, indicating that obvious age treatment effect can be obtained by processing the copper alloy at this voltage.

Claims

1. A current-assisted aging treatment method for real-time feedback of aging performance, characterized in that, The method includes the following steps: During the current treatment, when a constant-voltage power supply is used, a predetermined voltage value is set, and the current in the wire connected to the metal strip to be treated is detected. If the current in the wire does not change or does not increase to the predetermined current value, the power supply voltage and frequency are gradually increased by an amplitude of 5% - 30% to improve the aging efficiency; During the current treatment, when a constant-current power supply is used, a predetermined current value is set, and the voltage across the metal strip to be treated is detected. If the voltage across the metal strip to be treated does not change or does not drop to the predetermined voltage value, the effective current, frequency, and peak value are gradually increased by an amplitude of 5% - 30% to improve the aging efficiency.

2. The current-assisted aging treatment method for real-time feedback of aging performance according to claim 1, wherein When a constant-voltage power supply is used, for the current target value for the metal strip to be treated to achieve the aging effect, refer to the current value of the metal strip that has been aged and has the same size under the same voltage treatment.

3. The current-assisted aging treatment method for real-time feedback of aging performance according to claim 1, characterized in that When a constant-current power supply is used, for the voltage target value for the metal strip to be treated to achieve the aging effect, refer to the voltage value of the metal strip that has been aged and has the same size under the same current treatment.

4. An apparatus used for the current-assisted aging treatment method for real-time feedback of aging performance according to any one of claims 1-3, characterized in that, The device includes a current sensor (1), an oscilloscope (2), a voltage measuring device (3), a thermocouple (4), and a power supply (5). The positive pole of the power supply (5) is connected to one end of the metal strip to be treated (6) through a first wire (7), and the negative pole of the power supply (5) is connected to the other end of the metal strip to be treated (6) through a second wire (8). The current sensor (1) is connected to the second wire (8), and the oscilloscope (2) is electrically connected to the current sensor (1); The thermocouple (4) is connected to the metal strip to be treated (6); One end of the voltage measuring device (3) is connected to the first wire (7), the other end of the voltage measuring device (3) is connected to the second wire (8), and the voltage measuring device (3) is connected in parallel with the metal strip to be treated (6).

5. The device used in the current-assisted aging treatment method for real-time feedback of aging performance according to claim 4, characterized in that, The metal strip is a copper alloy strip, an aluminum alloy strip, or a steel strip.

6. The device used in the current-assisted aging treatment method for real-time feedback of aging performance according to claim 4, characterized in that The power supply (5) is a constant-voltage power supply or a constant-current power supply.

7. The device used in the current-assisted aging treatment method for real-time feedback of aging performance according to claim 4, wherein The current sensor (1) uses one of a Hall element or a Rogowski coil.

8. The device used in the current-assisted aging treatment method for real-time feedback of aging performance according to claim 4, characterized in that, The voltage measuring device (3) uses one of a voltmeter or an oscilloscope.

9. The device used in the current-assisted aging treatment method for real-time feedback of aging performance according to claim 4, characterized in that, The material of the first wire (7) is pure copper, and the cross-sectional area of the copper core of the first wire (7) is 4 - 20 times the cross-sectional area of the metal strip to be treated (6); The material of the second wire (8) is pure copper, and the cross-sectional area of the copper core of the second wire (8) is 4 - 20 times the cross-sectional area of the metal strip to be treated (6); The size of the first wire (7) is the same as the size of the second wire (8).

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