CN-122012889-A - Amorphous iron core magnetic field auxiliary stress annealing and performance regulation method

CN122012889ACN 122012889 ACN122012889 ACN 122012889ACN-122012889-A

Abstract

The invention provides an amorphous iron core magnetic field auxiliary stress annealing and performance regulation method, which belongs to the technical field of amorphous iron cores and comprises an annealing preparation stage, a gradient temperature regulation stage and a cooling stage, wherein the annealing preparation stage is used for placing a formed amorphous iron core in a magnetic field annealing furnace, vacuumizing the magnetic field annealing furnace, and continuously filling high-purity nitrogen into the magnetic field annealing furnace in the annealing operation of the amorphous iron core after the pressure of the magnetic field annealing furnace is reduced to 8 Pa; the gradient temperature adjusting stage is used for carrying out gradient adjustment and increment on the magnetic field intensity and the temperature in the magnetic field annealing furnace, stopping continuously increasing after the proper temperature and the magnetic field intensity are reached, and keeping the magnetic field intensity and the temperature for a period of time, so as to uniformly release thermal stress to the amorphous iron core; the invention can realize the uniform release of the thermal stress of the amorphous iron core, effectively reduce the residual stress and improve the performance of the amorphous iron core.

Inventors

LI HUIZHI
Xu Huangfeng
TIAN WENTAO
Yan Xinna
LU YUQING

Assignees

金华职业技术大学

Dates

Publication Date: 20260512
Application Date: 20260118

Claims (6)

1. The amorphous iron core magnetic field auxiliary stress annealing and performance regulating and controlling method is characterized by comprising an annealing preparation stage, a gradient temperature regulating stage and a cooling stage: In the annealing preparation stage, the formed amorphous iron core is placed in a magnetic field annealing furnace, vacuumizing operation is carried out in the magnetic field annealing furnace, and high-purity nitrogen is continuously filled into the magnetic field annealing furnace in the annealing operation of the amorphous iron core after the pressure of the magnetic field annealing furnace is reduced to 8 Pa; The gradient temperature adjusting stage is used for carrying out gradient adjustment and increment on the magnetic field intensity and the temperature in the magnetic field annealing furnace, stopping continuously increasing after the proper temperature and the magnetic field intensity are reached, and keeping the magnetic field intensity and the temperature for a period of time, so as to uniformly release thermal stress to the amorphous iron core; and in the cooling stage, after the stress annealing time period is finished, the magnetic field strength and the temperature are gradually decreased, so that the performance of the amorphous iron core is improved.
2. The method for magnetic field assisted stress annealing and performance control of an amorphous core according to claim 1, wherein the amorphous core itself has a residual stress of 50 MPa.
3. The method for magnetic field assisted stress annealing and performance regulation and control of an amorphous iron core according to claim 2, wherein the method is characterized in that the annealing preparation stage is performed, pure nitrogen is continuously filled in the annealing furnace, the nitrogen inlet flow is not lower than 10 Nm 3 /h, the duration of the iron core annealing preparation stage is 40-60min, and the pure nitrogen is continuously filled in the magnetic field annealing furnace in the annealing preparation stage.
4. The method for magnetic field assisted stress annealing and performance control of an amorphous core according to claim 3, wherein the gradient tempering stage comprises a first stage and a second stage; The temperature of the first-stage magnetic field annealing furnace is from 0 ℃ to 360 ℃, the heat preservation time of the first stage is 2h, the flow rate of input pure nitrogen is 8-12Nm 3 /h, the magnetic field strength of the first stage is 500A/m, the residual stress of the amorphous iron core is from 50MPa to 30MPa, the temperature of the second stage is from 360 ℃ to 400 ℃, the magnetic field strength of the second stage is 1500A/m, the heat preservation time of the second stage is 1h, the flow rate of input pure nitrogen is 15-20Nm 3 /h, and the residual stress of the amorphous iron core is from 30MPa to 10MPa.
5. The method for magnetic field assisted stress annealing and performance adjustment and control of an amorphous core according to claim 4, wherein the cooling stage comprises a first stage and a second stage; The temperature of the magnetic field annealing furnace in the first stage is reduced to 100 ℃, the magnetic field strength is reduced to 200A/m during the temperature reduction, the flow rate of the input pure nitrogen is 10-12 Nm 3 /h, the heat preservation is always 1h, the temperature in the second stage is reduced to room temperature, the magnetic field strength is reduced by 20A/m every time the temperature is reduced by 10 ℃, and the flow rate of the input pure nitrogen is reduced by 2 Nm 3 /h.
6. An amorphous iron core magnetic field auxiliary stress annealing device for executing the amorphous iron core magnetic field auxiliary stress annealing and performance regulation method according to any one of claims 1-5 is characterized by comprising a nitrogen storage tank, a magnetic field annealing furnace, a detection device and a single chip microcomputer, wherein the nitrogen storage tank is communicated with the magnetic field annealing furnace and is used for introducing nitrogen into the magnetic field annealing furnace, the magnetic field annealing furnace is used for executing an amorphous iron core annealing stress process, the detection device comprises a pressure sensor, a temperature sensor, an X-ray diffraction method instrument, a gas flowmeter and a Gaussian meter, the gas flowmeter is fixedly arranged at an air inlet of the magnetic field annealing furnace, the Gaussian meter Ji An is arranged in the magnetic field annealing furnace, the pressure sensor is arranged on the outer side of the magnetic field annealing furnace, the temperature sensor is arranged in the magnetic field annealing furnace, and the X-ray diffraction method instrument is used for detecting the amorphous iron core stress.

Description

Amorphous iron core magnetic field auxiliary stress annealing and performance regulation method Technical Field The invention relates to the technical field of fertilizer processing equipment, in particular to an amorphous iron core magnetic field auxiliary stress annealing and performance regulation method. Background In modern electronic devices, amorphous cores are widely used in transformers, inductors, and other electrical devices due to their excellent magnetic properties and high magnetic permeability. Residual stresses are inevitably generated during the manufacturing process of the amorphous core, and may affect the final performance and use reliability thereof. In order to effectively eliminate the residual stresses and improve the magnetic performance of the amorphous iron core, various stress annealing techniques have been developed in the industry. Among them, the magnetic field assisted stress annealing technique is an effective method. According to the method, the amorphous iron core is annealed in the magnetic field environment, so that the thermal stress in the amorphous iron core can be released more uniformly, and the magnetic performance of the amorphous iron core is improved. In a typical stress annealing process, an amorphous core is typically heated in a vacuum or in a specific gas environment, followed by slow cooling. However, the conventional method often fails to well control the stress release process during annealing, resulting in insufficient stability of the amorphous core. In order to solve the problems, the invention provides a novel magnetic field assisted stress annealing and performance regulating method. Disclosure of Invention In view of the above, the invention provides an amorphous iron core magnetic field auxiliary stress annealing and performance regulating method, which can realize uniform release of amorphous iron core thermal stress, effectively reduce residual stress and improve amorphous iron core performance. In order to solve the technical problems, the invention provides an amorphous iron core magnetic field auxiliary stress annealing and performance regulating and controlling method, which comprises an annealing preparation stage, a gradient temperature regulating stage and a cooling stage: In the annealing preparation stage, the formed amorphous iron core is placed in a magnetic field annealing furnace, vacuumizing operation is carried out in the magnetic field annealing furnace, and high-purity nitrogen is continuously filled into the magnetic field annealing furnace in the annealing operation of the amorphous iron core after the pressure of the magnetic field annealing furnace is reduced to 8 Pa; The gradient temperature adjusting stage is used for carrying out gradient adjustment and increment on the magnetic field intensity and the temperature in the magnetic field annealing furnace, stopping continuously increasing after the proper temperature and the magnetic field intensity are reached, and keeping the magnetic field intensity and the temperature for a period of time, so as to uniformly release thermal stress to the amorphous iron core; and in the cooling stage, after the stress annealing time period is finished, the magnetic field strength and the temperature are gradually decreased, so that the performance of the amorphous iron core is improved. And the amorphous iron core is self-residual stress of 50 MPa. Continuously filling pure nitrogen into the annealing furnace, wherein the nitrogen inlet flow is not lower than 10 Nm < 3 >/h, and the duration of the iron core annealing preparation stage is 40-60min in the annealing preparation stage; The gradient temperature adjustment stage comprises a first stage and a second stage, wherein the temperature of the magnetic field annealing furnace in the first stage is 0 ℃ to 360 ℃, the heat preservation time in the first stage is 2 hours, the flow rate of input pure nitrogen is 8-12Nm < 3 >/h, the magnetic field strength in the first stage is 500A/m, the residual stress of an amorphous iron core is 50MPa to 30MPa, the temperature in the second stage is 360 ℃ to 400 ℃, the magnetic field strength in the second stage is 1500A/m, the heat preservation time in the second stage is 1 hour, the flow rate of input pure nitrogen is 15-20Nm < 3 >/h, and the residual stress of the amorphous iron core is 30MPa to 10MPa; the temperature reduction stage comprises a first stage and a second stage, wherein the magnetic field annealing furnace in the first stage is cooled to 100 ℃, the magnetic field strength is reduced to 200A/m during the temperature reduction, the flow rate of the input pure nitrogen is 10-12 Nm < 3 >/h, the heat preservation time is always 1h, the temperature is reduced to room temperature, the magnetic field strength is reduced by 20A/m every 10 ℃ when the temperature is reduced, and the flow rate of the input pure nitrogen is reduced by 2 Nm < 3 >/h; The amorphous iron core magnetic field auxiliary s