Annealing process control method and system for amorphous alloy closed three-dimensional wound core

Abstract

The invention discloses an annealing process control method and system for an amorphous alloy closed three-dimensional wound core, and belongs to the technical field of preparation of amorphous alloy iron cores, and the annealing process control method for the amorphous alloy closed three-dimensional wound core comprises a preparation stage, a heating stage, a temperature difference pulling stage, a stepped heat preservation stage and a cooling stage. The annealing furnace is filled with pure nitrogen in the preparation stage; nitrogen and hydrogen mixed gas is charged into the iron core annealing furnace in the temperature rising stage, the oxygen content in the annealing furnace is reduced through the chemical reaction of hydrogen and oxygen, water vapor in the furnace is discharged through circulation of continuously-charged pure nitrogen, and the water vapor content in the annealing furnace is reduced; in the heat preservation stage, stepped heat preservation temperature adjustment is adopted so as to ensure that the internal and external temperatures of the amorphous iron core are stable in the heat preservation process; and an iron core drying link is added in the cooling stage, so that the overall annealing performance of the amorphous iron core is improved. The annealing process of the traditional amorphous alloy closed three-dimensional wound iron core is changed, and the performance of the iron core is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of amorphous alloy cores, and in particular to an annealing method and system for an amorphous alloy closed three-dimensional wound core. Background Art

[0002] Amorphous alloy materials are stress-sensitive materials. When subjected to external forces, their electromagnetic properties change greatly. Therefore, when amorphous alloy materials are prepared into amorphous cores, they need to undergo annealing heat treatment to reduce the impact of residual stress in the core on the electromagnetic properties of the core.

[0003] At present, the conventional annealing method for amorphous cores is to anneal in three stages of heating, heat preservation and cooling under the continuous introduction of pure nitrogen or compressed dry air. However, the influence of oxygen and water content in the annealing furnace on the annealing performance of the core is not considered during the annealing period. Although the conventional annealing scheme can reduce the stress influence of amorphous cores introduced by external forces during production, the performance of the core products after annealing is relatively discrete, and the performance of cores of the same model and specification produced in batches is unstable. For cores with higher performance requirements such as total loss, no-load current and noise, the conventional annealing scheme is difficult to meet the production needs. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides an annealing method and system for an amorphous alloy closed three-dimensional wound core, which can effectively improve the performance of the core.

[0005] The present invention adopts the following technical solution.

[0006] The first aspect of the present invention discloses an annealing process control method for an amorphous alloy closed three-dimensional wound core, comprising: an annealing preparation stage, a heating stage, a temperature difference pulling stage, a step-by-step insulation stage and a cooling stage;

[0007] During the annealing preparation stage, pure nitrogen is continuously filled into the annealing furnace for the amorphous core annealing operation;

[0008] During the heating stage, nitrogen and hydrogen mixed gas is filled into the core annealing furnace;

[0009] In the temperature difference pulling stage, the annealing furnace temperature is set to a temperature lower than the highest temperature in the heating stage;

[0010] In the step-by-step insulation stage, step-by-step insulation temperature adjustment is adopted to ensure the internal and external temperature stability of the amorphous core during the insulation process;

[0011] The cooling stage includes the first stage and the second stage. The first stage is the core drying stage. In addition to nitrogen, hydrogen is also filled during the drying process. The second stage is after the drying is completed, when hydrogen filling is stopped and only nitrogen is filled until the annealing process is completed.

[0012] Preferably, in the annealing preparation stage, pure nitrogen is continuously filled into the annealing furnace, the nitrogen flow rate is not less than 80 L / min, and the duration of the core annealing preparation stage is 60-90 min.

[0013] Preferably, during the heating stage, the temperature is set to T0°C, nitrogen is introduced throughout the heating stage, the nitrogen flow rate is not less than 80 L / min in the first 30 minutes of the heating stage, and the nitrogen flow rate is not less than 40 L / min after 30 minutes; hydrogen is simultaneously introduced in the first 30 minutes of the heating stage, and the hydrogen flow rate is not higher than 3.5 L / min; the introduction of hydrogen is stopped after 30 minutes.

[0014] Preferably, the value range of T0 is 334-345°C.

[0015] Preferably, in the temperature difference pulling stage, the set temperature in the annealing furnace is 20-30°C lower than the set temperature T0 in the heating stage, and the duration of the temperature difference pulling stage is not less than 60 minutes; nitrogen is continuously introduced during the temperature difference pulling stage, and the nitrogen flow rate is not less than 40L / min.

[0016] Preferably, in the annealing and insulation stage of the amorphous core, the set temperature is T1, the starting temperature of the step insulation stage is T1+ρ, and the ending temperature of the step insulation stage is T1-ρ, where ρ is the temperature difference of the step insulation stage, and ρ is ≤5°C; nitrogen is continuously introduced in the step insulation stage, and the nitrogen flow rate is not less than 40L / min;

[0017] Preferably, the cooling is divided into two stages, the first stage is cooling to 100°C, and the second stage is cooling to room temperature. In the first stage of cooling, the annealing temperature is first reduced to 100°C, and nitrogen is continuously charged during the cooling period, and the nitrogen flow rate is not less than 40L / min; hydrogen is charged at the same time, and the hydrogen charging flow rate is not higher than 3.5L / min; in the second stage of cooling, the temperature is reduced to room temperature, during which only nitrogen is charged, and the nitrogen flow rate is not less than 40L / min. .

[0018] The second aspect of the present invention discloses an annealing process control system for an amorphous alloy closed three-dimensional wound core, and the annealing process control method for an amorphous alloy closed three-dimensional wound core includes: a nitrogen storage tank, a hydrogen storage tank and an annealing furnace;

[0019] The nitrogen storage tank and the hydrogen storage tank are respectively connected to the annealing furnace, and are used to introduce hydrogen and nitrogen into the annealing furnace;

[0020] The annealing furnace is used to perform an annealing process for an amorphous alloy closed three-dimensional wound core.

[0021] The third aspect of the present invention discloses an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, the annealing process control method of an amorphous alloy closed-end three-dimensional wound core is implemented.

[0022] The fourth aspect of the present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the annealing process control method of an amorphous alloy closed-end three-dimensional wound core is implemented.

[0023] Compared with the prior art, the beneficial effects of the present invention include at least:

[0024] Compared with the existing conventional scheme, the present invention adds a step of introducing hydrogen in the heating stage, and reduces the oxygen content in the annealing furnace by reacting hydrogen with oxygen under high temperature conditions. At the same time, by increasing the nitrogen flow rate, the water vapor in the annealing furnace cavity is taken away, and the reduction of oxygen and water vapor content in the annealing furnace is accelerated. In the step-type insulation stage, the mode of constant temperature control in the traditional annealing furnace cavity is changed, and the constant temperature control of the temperature inside and outside the core is monitored to ensure that the core can obtain an effective insulation time.

[0025] The present invention changes the traditional direct cooling mode in the annealing cooling stage, and instead dries the iron core in the furnace after cooling to 100° C. Meanwhile, hydrogen is introduced after cooling to 100° C. to further consume the oxygen content in the furnace at the end of the annealing process, thereby reducing the influence of oxygen on the oxidation of the iron core surface. The electromagnetic properties of the iron core finished product are compared with the properties of the amorphous iron core after conventional annealing operations, and the total loss value, noise value, and no-load current value of the product are all reduced, the discreteness of the iron core performance is effectively controlled, and the performance of the iron core is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the amorphous core annealing process of the present invention;

[0027] Figure 2 It is the annealing curve of amorphous core. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0029] like Figure 1As shown, embodiment 1 of the present invention provides a control method for the annealing process of an amorphous alloy closed three-dimensional wound core, including five stages: a preparation stage, a heating stage, a temperature difference pulling stage, a step-by-step insulation stage, and a cooling stage.

[0030] 1. Preparation stage: fill the annealing furnace with pure nitrogen;

[0031] The annealing furnace is continuously filled with pure nitrogen, the nitrogen flow rate is not less than 80L / min, and the duration of the core annealing preparation stage is 60-90min;

[0032] The annealing furnace, which can simultaneously complete the annealing operations of 6 amorphous cores, is continuously filled with pure nitrogen.

[0033] 2. Heating stage: Fill the iron core annealing furnace with nitrogen and hydrogen mixed gas;

[0034] That is, when the annealing furnace is continuously filled with pure nitrogen, hydrogen is also filled at the same time, and the oxygen content in the annealing furnace is reduced by the chemical reaction between hydrogen and oxygen, and the water vapor in the furnace is discharged by the continuous circulation of pure nitrogen, thereby reducing the water vapor content in the annealing furnace;

[0035] The heating temperature in the heating stage is set to T0°C, and the T0 value is 334-345°C; nitrogen is introduced throughout the heating stage, and the nitrogen flow rate is not less than 80L / min in the first 30 minutes of the heating stage, and the nitrogen flow rate is not less than 40L / min after 30 minutes; hydrogen is simultaneously introduced in the first 30 minutes of the heating stage, and the hydrogen filling flow rate is not higher than 3.5L / min; the introduction of hydrogen is stopped after 30 minutes.

[0036] 3. In the temperature difference stage, the annealing furnace temperature setting temperature is lower than the highest temperature in the heating stage;

[0037] The set temperature in the furnace during the temperature difference pulling stage is 20-30°C lower than the set temperature T0 during the heating stage, and the duration of the temperature difference pulling stage is not less than 60 minutes; nitrogen is continuously introduced during the temperature difference pulling stage, and the nitrogen flow rate is not less than 40L / min.

[0038] 4. In the step-by-step insulation stage, step-by-step insulation temperature adjustment is adopted to ensure the internal and external temperature stability of the amorphous core during the insulation process;

[0039] The holding temperature of the annealing furnace is uniformly reduced, and the arithmetic mean of the highest holding temperature point and the lowest holding temperature point is the initial setting value of the holding temperature of the amorphous core;

[0040] That is, the set temperature of the amorphous core annealing insulation stage is T1, and the temperature range of T1 is 335°C to 340°C. Then the starting temperature of the step insulation stage is T1+ρ, and the ending temperature of the step insulation stage is T1-ρ, where ρ is the temperature difference of the step insulation stage, and ρ is ≤5°C;

[0041] Nitrogen is continuously introduced during the step-by-step insulation stage, with a nitrogen flow rate of no less than 40 L / min.

[0042] 5. The cooling stage is divided into two stages. The first stage is the core drying stage. In the drying process, hydrogen is also filled in addition to nitrogen. The second stage is after the drying is completed, the hydrogen filling is stopped and only nitrogen is filled until the annealing process is completed.

[0043] In the first stage of cooling, the annealing temperature is first reduced to 100° C., and nitrogen is continuously charged during the cooling period, with a nitrogen flow rate of not less than 40 L / min; hydrogen is charged at the same time, with a hydrogen charging flow rate of not more than 3.5 L / min;

[0044] In the second cooling stage, the temperature is lowered to room temperature, during which only nitrogen is charged, and the nitrogen flow rate is not less than 40 L / min.

[0045] In this application, taking the annealing of 400kVA amorphous core as an example, 6 400kVA amorphous cores are placed in the annealing furnace. After closing the furnace door, a current of 1200A is passed through the copper rod passing through the core during the entire annealing process. The preparation stage is started, and pure nitrogen is continuously introduced with a nitrogen flow rate of 80L / min to replace the air in the annealing furnace and reduce the oxygen and moisture content in the annealing furnace.

[0046] like Figure 2 As shown, after pure nitrogen is introduced for 60-90 minutes, the temperature rise stage is entered, the temperature rise temperature is set to 335-345°C, the flow rate of pure nitrogen is adjusted to no more than 40L / min, and hydrogen is introduced at the same time, with a hydrogen flow rate of no more than 3.5L / min, and the introduction of hydrogen is stopped after 30 minutes.

[0047] When the temperature sensor in the annealing furnace monitors that the temperature difference between the core surface temperature and the core column center reaches 50-60℃, it enters the temperature difference pulling stage. At this time, the temperature of the annealing furnace is reduced by 20-30℃. When the temperature difference between the core surface temperature and the core column center is within 5℃, it enters the insulation stage.

[0048] The temperature is set to T1+5°C at the beginning of the insulation stage, the insulation time is set to 150-250min, and the temperature in the furnace is set to T1-5°C at the end of the insulation stage. The temperature in the annealing furnace decreases evenly during the insulation stage.

[0049] After the heat preservation stage, the cooling stage begins. The temperature is first reduced to 100°C, and hydrogen is refilled into the annealing furnace. The hydrogen flow rate is not higher than 3.5L / min. When the core temperature drops to 100°C, the hydrogen is turned off and nitrogen is continuously introduced until the core temperature reaches room temperature. At this point, the entire annealing process of the 400kVA amorphous core is completed.

[0050] In the specific operation, the amorphous core annealing process control method of the present invention is used to carry out annealing operation on the amorphous core. The performance parameters of 100kVA, 200kVA, and 400kVA amorphous cores are annealed within one month before and after the implementation of the scheme, and the mean of the performance test data is normalized. The performance changes are shown in the following table:

[0051] Table 1 Statistics of amorphous core performance after normalization

[0052]

[0053] It can be seen that the electromagnetic properties of the finished core are compared with the performance of the amorphous core after conventional annealing, and the total loss value, noise value, and no-load current value of the product are all reduced, and the discreteness of the core performance is effectively controlled.

[0054] Embodiment 2 of the present invention provides a control system for an annealing process of an amorphous alloy closed three-dimensional wound core, comprising: a nitrogen storage tank, a hydrogen storage tank, and an annealing furnace for annealing treatment;

[0055] The nitrogen storage tank and the hydrogen storage tank are respectively connected to the annealing furnace, and are used to introduce hydrogen and nitrogen into the annealing furnace;

[0056] The annealing furnace includes a furnace for performing an annealing process on an amorphous alloy closed three-dimensional wound core.

[0057] Embodiment 3 of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is loaded into the processor, a control method for an annealing process of an amorphous alloy closed-end three-dimensional rolled core is implemented according to Embodiment 1.

[0058] Embodiment 4 of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, a control method for an amorphous alloy closed-end three-dimensional wound core annealing process according to Embodiment 1 is implemented.

[0059] Compared with the prior art, the beneficial effects of the present invention include at least:

[0060] Compared with the existing conventional scheme, the present invention adds a step of introducing hydrogen in the heating stage, and reduces the oxygen content in the annealing furnace by reacting hydrogen with oxygen under high temperature conditions. At the same time, by increasing the nitrogen flow rate, the water vapor in the annealing furnace cavity is taken away, and the reduction of oxygen and water vapor content in the annealing furnace is accelerated. In the step-type insulation stage, the mode of constant temperature control in the traditional annealing furnace cavity is changed, and the constant temperature control of the temperature inside and outside the core is monitored to ensure that the core can obtain an effective insulation time.

[0061] The present invention changes the traditional direct cooling mode in the annealing cooling stage, and instead dries the iron core in the furnace after cooling to 100°C. At the same time, hydrogen is introduced after cooling to 100°C to further consume the oxygen content in the furnace at the end of the annealing process, reduce the effect of oxygen on the oxidation of the iron core surface, and make the electromagnetic performance of the iron core finished product compared with the performance of the amorphous iron core after conventional annealing operation. The total loss value, noise value, and no-load current value of the product are all reduced, the core performance discreteness is effectively controlled, and the performance of the iron core is improved. .

[0062] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0063] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0064] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0065] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0066] 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 above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An annealing process control method for an amorphous alloy closed three-dimensional wound core, characterized in that: include: Annealing preparation stage, heating stage, temperature difference pulling stage, step-by-step insulation stage and cooling stage; During the annealing preparation stage, pure nitrogen is continuously filled into the annealing furnace for the amorphous core annealing operation; During the heating stage, nitrogen and hydrogen mixed gas is filled into the core annealing furnace; In the temperature difference pulling stage, the annealing furnace temperature is set to a temperature lower than the highest temperature in the heating stage; In the step-by-step insulation stage, step-by-step insulation temperature adjustment is adopted to ensure the internal and external temperature stability of the amorphous core during the insulation process; The cooling stage includes the first stage and the second stage. The first stage is the core drying stage. In addition to nitrogen, hydrogen is also filled during the drying process. The second stage is after the drying is completed, when hydrogen filling is stopped and only nitrogen is filled until the annealing process is completed.

2. The annealing process control method of an amorphous alloy closed three-dimensional wound core according to claim 1, characterized in that: During the annealing preparation stage, pure nitrogen is continuously filled into the annealing furnace, and the nitrogen flow rate is not less than 80L / min. The duration of the core annealing preparation stage is 60-90min.

3. The annealing process control method of an amorphous alloy closed three-dimensional wound core according to claim 1, characterized in that: During the heating stage, the temperature is set to T0℃, nitrogen is introduced throughout the heating stage, and the nitrogen flow rate is not less than 80L / min in the first 30 minutes of the heating stage, and the nitrogen flow rate is not less than 40L / min after 30 minutes; hydrogen is also introduced in the first 30 minutes of the heating stage, and the hydrogen flow rate is not higher than 3.5L / min; the introduction of hydrogen is stopped after 30 minutes.

4. The annealing process control method of an amorphous alloy closed three-dimensional wound core according to claim 3, characterized in that: The value range of T0 is 334-345°C.

5. The annealing process control method of an amorphous alloy closed three-dimensional wound core according to claim 1, characterized in that: In the temperature difference pulling stage, the set temperature in the annealing furnace is 20-30°C lower than the set temperature T0 in the heating stage, and the duration of the temperature difference pulling stage is not less than 60 minutes; Nitrogen is continuously introduced during the temperature difference stage, and the nitrogen flow rate is not less than 40L / min.

6. The annealing process control method of an amorphous alloy closed three-dimensional wound core according to claim 1, characterized in that: During the annealing and insulation stage of the amorphous core, the set temperature is T1, the starting temperature of the step insulation stage is T1+ρ, and the ending temperature of the step insulation stage is T1-ρ, where ρ is the temperature difference of the step insulation stage, and ρ is ≤5°C; nitrogen is continuously introduced during the step insulation stage, and the nitrogen flow rate is not less than 40L / min.

7. The annealing process control method of an amorphous alloy closed three-dimensional wound core according to claim 1, characterized in that: The cooling is divided into two stages, the first stage is cooling to 100°C, and the second stage is cooling to room temperature. In the first stage of cooling, the annealing temperature is first reduced to 100°C, and nitrogen is continuously charged during the cooling period, and the nitrogen flow rate is not less than 40L / min; hydrogen is charged at the same time, and the hydrogen charging flow rate is not higher than 3.5L / min; in the second stage of cooling, the temperature is reduced to room temperature, during which only nitrogen is charged, and the nitrogen flow rate is not less than 40L / min.

8. An annealing process control system for an amorphous alloy closed three-dimensional wound core, implementing an annealing process control method for an amorphous alloy closed three-dimensional wound core according to any one of claims 1 to 7, Features: Including: nitrogen storage tank, hydrogen storage tank and annealing furnace; The nitrogen storage tank and the hydrogen storage tank are respectively connected to the annealing furnace, and are used to introduce hydrogen and nitrogen into the annealing furnace; The annealing furnace is used to perform an annealing process for an amorphous alloy closed three-dimensional wound core.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is loaded into a processor, an annealing process control method for an amorphous alloy closed three-dimensional wound core according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, an annealing process control method for an amorphous alloy closed three-dimensional wound core is implemented according to any one of claims 1 to 7.

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