Method for heat treating an electrical machine core

Abstract

The application belongs to the technical field of motor core manufacturing, and discloses a motor core heat treatment method. The motor core heat treatment method comprises the following steps: S1, an oil removal stage: placing the core into a heat treatment furnace, starting the heat treatment furnace, increasing the furnace temperature to 400 DEG C and keeping the temperature for 30 minutes to remove the oil stains on the core; S2, a temperature increasing stage: increasing the furnace temperature to 660 DEG C; S3, a rapid annealing stage: increasing the furnace temperature to 690 DEG C and keeping the temperature for 30 minutes, and then decreasing the furnace temperature to 600 DEG C; S4, a secondary annealing stage: increasing the furnace temperature to 690 DEG C and keeping the temperature for 30 minutes, and then decreasing the furnace temperature to 660 DEG C and keeping the temperature for 10 minutes; S5, a bluing stage: decreasing the furnace temperature and keeping the temperature for 40 minutes to carry out the bluing treatment on the core; and S6, a temperature decreasing stage: decreasing the furnace temperature to room temperature. The motor core heat treatment method can guarantee the treatment effect of the core, shorten the time of the whole temperature increasing and keeping stages, and greatly reduce the energy consumption of the core heat treatment.

Description

Technical Field

[0001] This invention relates to the field of motor core manufacturing technology, and in particular to a method for heat treatment of motor cores. Background Technology

[0002] Electric motors are one of the most important pieces of equipment in industrial production, and the iron core is the core component of an electric motor. The quality of the motor iron core is closely related to the performance of the motor. In order to improve the performance of the motor, the motor iron core usually needs to be heat-treated. Heat treatment can improve the microstructure of the iron core, thereby improving the efficiency and stability of the motor operation.

[0003] Existing heat treatment methods for motor cores typically require placing the core in an environment exceeding 600°C. The entire heat treatment process involves prolonged heating and holding phases, which consume a significant amount of energy. Summary of the Invention

[0004] The purpose of this invention is to provide a heat treatment method for motor cores that can shorten the heating and holding time and reduce the energy consumption of the core heat treatment.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Heat treatment methods for motor cores include:

[0007] S1. Degreasing stage: Place the iron core into the heat treatment furnace, turn on the heat treatment furnace, raise the furnace temperature to 400°C and keep it at that temperature for 30 minutes to remove the oil stains on the iron core.

[0008] S2, Heating Stage: Raise the furnace temperature to 660℃;

[0009] S3, Rapid Annealing Stage: Raise the furnace temperature to 690℃ and hold for 30 minutes, then lower the furnace temperature to 600℃;

[0010] S4, Secondary Annealing Stage: Raise the furnace temperature to 690°C and hold for 30 minutes, then lower the furnace temperature to 660°C and hold for 10 minutes;

[0011] S5. Blueing stage: Reduce the furnace temperature to 480℃ and hold for 40 minutes to perform blueing treatment on the iron core;

[0012] S6. Cooling stage: Reduce furnace temperature to room temperature.

[0013] Preferably, the process includes the following steps before step S2:

[0014] A protective gas is injected into the heat treatment furnace.

[0015] Preferably, the protective gas includes carbon monoxide, carbon dioxide, hydrogen, and nitrogen.

[0016] The beneficial effects of this invention are as follows:

[0017] The heat treatment method for motor cores provided by this invention first raises the furnace temperature to degrease the core, removing oil stains that adhered to the core during processing, thus creating favorable processing conditions for subsequent injection molding or spraying. Since this heat treatment method includes two annealing stages—rapid annealing and secondary annealing—both require raising the furnace temperature to 690°C and holding it for 30 minutes before lowering the furnace temperature. Compared to current single-stage annealing methods, this method, by adding an annealing step and increasing the furnace temperature for both annealing stages, shortens the overall heating and holding time while maintaining the original treatment effect of the core, thereby significantly reducing the energy consumption for core heat treatment. Attached Figure Description

[0018] Figure 1 This is a flowchart comparing the heat treatment method for motor cores provided in a specific embodiment of the present invention. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] like Figure 1 As shown, the present invention provides a method for heat treatment of motor cores, the method comprising:

[0024] S1. Degreasing Stage: The iron core is placed in a heat treatment furnace, the furnace is turned on, the furnace temperature is raised to 400°C and held for 30 minutes to remove oil stains from the iron core. In this embodiment, the iron core is first placed in a heat treatment furnace specifically designed for this purpose, and the furnace temperature is raised to 400°C and maintained at this temperature for 30 minutes. This facilitates the degreasing treatment of the iron core, thereby removing the stamping oil from the iron core and creating favorable processing conditions for subsequent injection molding or spraying.

[0025] S2. Heating Stage: Raise the furnace temperature to 660℃. Specifically, after the degreasing stage is completed, raise the furnace temperature to 660℃ to prepare for the subsequent rapid annealing stage.

[0026] S3. Rapid Annealing Stage: Raise the furnace temperature to 690°C and hold for 30 minutes, then lower the furnace temperature to 600°C. In this embodiment, the furnace temperature is held at 660°C for 10 minutes, then raised to 690°C and held for 30 minutes, and then lowered to 600°C to complete the first annealing treatment. The highest furnace temperature of the original core heat treatment method is generally 660°C, while the furnace temperature of the rapid annealing stage is higher than the highest furnace temperature of the original core heat treatment method.

[0027] S4. Secondary Annealing Stage: Raise the furnace temperature to 690°C and hold for 30 minutes, then lower the furnace temperature to 660°C and hold for 10 minutes. In this embodiment, when the furnace temperature drops to 600°C, it is raised to 690°C and held for 30 minutes to perform a secondary annealing treatment on the iron core. By performing two consecutive annealing treatments on the iron core, the internal stress of the iron core can be effectively eliminated and the microstructure of the iron core can be improved, thereby reducing the wear and tear of the iron core during operation. Specifically, the furnace temperature in the two consecutive annealing treatments is higher than that in the original iron core treatment method, and the total time of the rapid annealing stage and the secondary annealing stage is shortened by about 40 minutes compared with the original heating and holding stages. It can reduce the energy consumption of the iron core heat treatment while ensuring the original treatment effect, thereby achieving the purpose of energy saving.

[0028] S5. Bluing Stage: Reduce the furnace temperature to 480℃ and hold for 40 minutes to bluing the iron core. In this embodiment, the iron core needs to be bluing during the bluing stage to form a smooth and dense oxide protective film on the surface of the iron core, thereby providing anti-corrosion and moisture-proof properties.

[0029] S6. Cooling Stage: Reduce the furnace temperature to room temperature. In this embodiment, after the blueing stage is completed, the heat treatment furnace is shut down, and the iron core is removed after the furnace temperature drops to room temperature.

[0030] Furthermore, before step S2, a protective gas is injected into the heat treatment furnace. In this embodiment, a protective gas needs to be injected into the heat treatment furnace before the heating stage to make the iron core more stable during the heat treatment process and improve the safety of the entire heat treatment process.

[0031] Specifically, the protective gases include carbon monoxide, carbon dioxide, hydrogen, and nitrogen. In this embodiment, carbon monoxide, carbon dioxide, hydrogen, and nitrogen are commonly used protective gases for furnace heat treatment in the art, and their preparation methods and usage costs are low.

[0032] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A heat treatment method for an electric motor core, characterized in that, include: S1. Degreasing stage: Place the iron core into the heat treatment furnace, turn on the heat treatment furnace, raise the furnace temperature to 400°C and keep it at that temperature for 30 minutes to remove the oil stains on the iron core. S2, Heating Stage: Raise the furnace temperature to 660℃; S3. Rapid annealing stage: Hold at 660℃ for 10 minutes, raise the furnace temperature to 690℃ and hold for 30 minutes, then lower the furnace temperature to 600℃. S4, Secondary Annealing Stage: Raise the furnace temperature to 690°C and hold for 30 minutes, then lower the furnace temperature to 660°C and hold for 10 minutes; S5. Blueing stage: Reduce the furnace temperature to 480℃ and hold for 40 minutes to perform blueing treatment on the iron core; S6. Cooling stage: Reduce furnace temperature to room temperature.

2. The method for heat treatment of motor cores according to claim 1, characterized in that, Step S2 includes the following: A protective gas is injected into the heat treatment furnace.

3. The heat treatment method for motor core according to claim 2, characterized in that, The protective gases include carbon monoxide, carbon dioxide, hydrogen, and nitrogen.

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