CN113564325A - Heat treatment process for motor iron core for new energy vehicle - Google Patents
Heat treatment process for motor iron core for new energy vehicle Download PDFInfo
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- CN113564325A CN113564325A CN202110923618.5A CN202110923618A CN113564325A CN 113564325 A CN113564325 A CN 113564325A CN 202110923618 A CN202110923618 A CN 202110923618A CN 113564325 A CN113564325 A CN 113564325A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
- C23C8/18—Oxidising of ferrous surfaces
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention relates to the field of processing of motor stator cores for new energy vehicles, in particular to a heat treatment process of a motor stator core for a new energy vehicle. The invention comprises the following steps: s1, putting the stator core into a vacuum heat treatment furnace, introducing first protective gas, introducing second protective gas, and heating to a second furnace temperature heat preservation temperature X2 ℃; step S2, introducing the first reducing gas to a third furnace pressure U3Mpa, introducing the second reducing gas to a fourth furnace pressure U4Mpa, and finally introducing the third reducing gas to a fifth furnace pressure U5 Mpa; step S3, putting the stator core after heat treatment into a bluing furnace which is vacuumized; and step S4, putting the stator core into the first vacuum-pumping cooling furnace, and introducing third protective gas until the tenth furnace pressure U10 Mpa. The invention adopts the stator core heat treatment process, can eliminate the internal stress of the stator core, improve the microstructure of the stator core, refine and homogenize crystal grains, enhance the magnetic conductivity of the stator core and reduce the hysteresis loss and the eddy current loss of the core.
Description
Technical Field
The invention relates to the field of processing of motor stator cores for new energy vehicles, in particular to a heat treatment process of a motor stator core for a new energy vehicle.
Background
At present, new energy automobiles develop rapidly, and the limited driving range of the automobiles is the development bottleneck of the new energy automobiles. Under the condition of not increasing the battery capacity, the energy consumption of the whole vehicle is reduced, and the driving range is increased, so that the urgent need is met.
The motor stator for the new energy vehicle is formed by stamping and welding silicon steel sheets, the crystal structure of the silicon steel can be damaged in the machining process, the magnetic conductivity of a stator iron core is damaged, and the loss of the motor stator iron core is increased.
Through carrying out heat treatment to the stator core of automobile-used motor, can promote stator core magnetic conductivity, reduce the stator core loss, promote vehicle actuating system efficiency, increase the vehicle and continue to drive the mileage.
Traditional motor heat treatment technology mainly is applied to air condition compressor, and the motor stator is little, and motor stator and motor casing adopt bolted connection, and the automobile-used motor stator of new forms of energy is big, and motor stator and motor casing adopt interference fit, so traditional heat treatment technology who is applied to air condition compressor is not applicable to the automobile-used motor of new forms of energy.
Disclosure of Invention
The invention aims to provide a heat treatment process for a motor iron core for a new energy vehicle, which solves the problem that the heat treatment technology for the motor in the prior art is difficult to be applied to the motor for the new energy vehicle, improves the crystal structure of silicon steel, improves the magnetic conductivity and reduces the loss of the iron core.
In order to achieve the purpose, the invention provides a heat treatment process of a motor iron core for a new energy vehicle, which comprises the following steps of:
s1, putting the stator core into a vacuum heat treatment furnace, firstly introducing first protective gas until the first furnace pressure U1Mpa, then heating to the first furnace temperature heat preservation temperature X1 ℃ at a first heating rate T1 ℃/min and keeping the first heat preservation time A1min, then introducing second protective gas until the second furnace pressure U2Mpa, then heating to the second furnace temperature heat preservation temperature X2 ℃ at a second heating rate T2 ℃/min and keeping the second heat preservation time A2 min;
s2, introducing a first reducing gas to a third furnace pressure U3Mpa, then heating to a third furnace temperature heat preservation temperature X3 ℃ at a third heating rate T3 ℃/min and keeping the third heat preservation time for A3min, introducing a second reducing gas to a fourth furnace pressure U4Mpa, then heating to a fourth furnace temperature heat preservation temperature X4 ℃ at a fourth heating rate T4 ℃/min and keeping the fourth heat preservation time for A4min, finally introducing a third reducing gas to a fifth furnace pressure U5Mpa, cooling to a fifth furnace temperature heat preservation temperature X5 ℃ and keeping the fifth heat preservation time for A5 min;
s3, placing the stator core after heat treatment into a vacuumizing bluing furnace, wherein the bluing furnace initial temperature is the sixth furnace temperature heat preservation temperature X6 ℃, introducing water vapor to the sixth furnace pressure U6Mpa for the first time, keeping the sixth heat preservation time for A6min, cooling to the seventh furnace temperature heat preservation temperature X7 ℃, introducing water vapor to the seventh furnace pressure U7Mpa again, and keeping the seventh heat preservation time for A7 min;
and S4, placing the processed stator core into a first vacuum-pumping cooling furnace, wherein the initial temperature of the first cooling furnace is the eighth furnace temperature heat preservation temperature X8 ℃, introducing third protective gas to an eighth furnace pressure U8Mpa, keeping the eighth heat preservation time for A8min, then placing the stator core into a second vacuum-pumping cooling furnace, the initial temperature of the cooling furnace is the ninth furnace temperature heat preservation temperature X9 ℃, introducing third protective gas to a ninth furnace pressure U9Mpa, keeping the ninth heat preservation time for A9min, placing the stator core into the third vacuum-pumping cooling furnace, the initial temperature of the cooling furnace is the tenth furnace temperature heat preservation temperature X10 ℃, introducing third protective gas to a tenth furnace pressure U10Mpa, and keeping the tenth heat preservation time for A10 min.
In one embodiment, in step S1, the first shielding gas is argon, and the second shielding gas is helium.
In one embodiment, in step S1, the first shielding gas is helium, and the second shielding gas is argon.
In one embodiment, in step S2, the first reducing gas is carbon monoxide, the second reducing gas is methane, and the third reducing gas is hydrogen.
In one embodiment, in step S2, the first reducing gas is methane, the second reducing gas is carbon monoxide, and the third reducing gas is hydrogen.
In an embodiment, in the step S4, the third shielding gas is nitrogen.
In one embodiment, the range of furnace pressure parameters is shown in table 1 below:
TABLE 1 furnace pressure parameters
In one embodiment, the temperature-increasing rate parameter has a value range as shown in table 2 below:
TABLE 2 Rate of heating
In one embodiment, the furnace temperature holding temperature parameter has a value range as shown in table 3 below:
TABLE 3 furnace temperature holding temperature parameters
In one embodiment, the value range of the holding time duration parameter is as shown in table 4 below:
TABLE 4 Heat preservation duration parameter
The heat treatment process for the motor iron core for the new energy vehicle, provided by the invention, adopts the heat treatment process for the stator iron core, can eliminate the internal stress of the stator iron core, improve the microstructure of the stator iron core, refine and homogenize crystal grains, enhance the magnetic conductivity of the stator iron core, and reduce the hysteresis loss and eddy current loss of the iron core.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:
fig. 1 discloses a process flow diagram of a heat treatment process of a motor iron core for a new energy vehicle according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below 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 are not intended to limit the invention.
The invention provides a heat treatment process for a motor iron core for a new energy vehicle, which belongs to the field of processing of a motor stator iron core for the new energy vehicle and comprises the following steps: thermal stabilization, heat treatment, bluing and cooling.
Fig. 1 discloses a flow chart of a heat treatment process for a motor core for a new energy vehicle according to an embodiment of the present invention, and as shown in fig. 1, the heat treatment process for the motor core for the new energy vehicle provided by the present invention includes the following steps:
s1, putting the stator core into a vacuum heat treatment furnace, firstly introducing first protective gas until the first furnace pressure U1Mpa, then heating to the first furnace temperature heat preservation temperature X1 ℃ at a first heating rate T1 ℃/min and keeping the first heat preservation time A1min, then introducing second protective gas until the second furnace pressure U2Mpa, then heating to the second furnace temperature heat preservation temperature X2 ℃ at a second heating rate T2 ℃/min and keeping the second heat preservation time A2 min;
s2, introducing a first reducing gas to a third furnace pressure U3Mpa, then heating to a third furnace temperature heat preservation temperature X3 ℃ at a third heating rate T3 ℃/min and keeping the third heat preservation time for A3min, introducing a second reducing gas to a fourth furnace pressure U4Mpa, then heating to a fourth furnace temperature heat preservation temperature X4 ℃ at a fourth heating rate T4 ℃/min and keeping the fourth heat preservation time for A4min, finally introducing a third reducing gas to a fifth furnace pressure U5Mpa, cooling to a fifth furnace temperature heat preservation temperature X5 ℃ and keeping the fifth heat preservation time for A5 min;
s3, placing the stator core after heat treatment into a vacuumizing bluing furnace, wherein the bluing furnace initial temperature is the sixth furnace temperature heat preservation temperature X6 ℃, introducing water vapor to the sixth furnace pressure U6Mpa for the first time, keeping the sixth heat preservation time for A6min, cooling to the seventh furnace temperature heat preservation temperature X7 ℃, introducing water vapor to the seventh furnace pressure U7Mpa again, and keeping the seventh heat preservation time for A7 min;
step S4, the processed stator core is placed into a first vacuum-pumping cooling furnace (cooling furnace 1), the initial temperature of the first cooling furnace is eighth furnace temperature heat preservation temperature X8 ℃, third protective gas is introduced to eighth furnace pressure U8Mpa, the eighth heat preservation time is kept for A8min, then the stator core is placed into a second vacuum-pumping cooling furnace (cooling furnace 2), the initial temperature of the cooling furnace is ninth furnace temperature heat preservation temperature X9 ℃, third protective gas is introduced to ninth furnace pressure U9Mpa, the ninth heat preservation time is kept for A9min, the stator core is placed into a third vacuum-pumping cooling furnace (cooling furnace 3), the initial temperature of the cooling furnace is tenth furnace temperature heat preservation temperature X10 ℃, third protective gas is introduced to tenth furnace pressure U10Mpa, and the tenth heat preservation time is kept for A10 min.
In the embodiment shown in fig. 1, in the step S1, the first shielding gas is argon, and the second shielding gas is helium.
In the embodiment shown in fig. 1, in the step S2, the first reducing gas is carbon monoxide, the second reducing gas is methane, and the third reducing gas is hydrogen.
In the embodiment shown in fig. 1, in the step S4, the third shielding gas is nitrogen.
Further, optionally, in step S1, the first shielding gas is helium, and the second shielding gas is argon.
Further, optionally, in the step S2, the first reducing gas is methane, the second reducing gas is carbon monoxide, and the third reducing gas is hydrogen.
Wherein, the value range of the furnace pressure parameter is shown in the following table 1: :
TABLE 1 furnace pressure parameters
The range of the temperature rise rate parameter is shown in the following table 2:
TABLE 2 Rate of heating
The value range of the furnace temperature heat preservation temperature parameter is shown in the following table 3:
TABLE 3 furnace temperature holding temperature parameters
The value range of the furnace temperature holding time length parameter is shown in the following table 4:
TABLE 4 furnace temperature holding time duration parameter
Example 1
In this embodiment 1, the first protective gas is argon, the second protective gas is helium, the first reducing gas is carbon monoxide, the second reducing gas is methane, the third reducing gas is hydrogen, and the third protective gas is nitrogen.
And S1, putting the stator core into a vacuum heat treatment furnace, introducing protective gas argon to the furnace pressure until the first furnace pressure is U1Mpa, heating to the first furnace temperature heat preservation temperature X1 ℃ at a first heating rate T1 ℃/min, and keeping the first heat preservation time A1 min. And introducing helium gas as a protective gas until the furnace pressure is U2Mpa, and then heating to the second furnace temperature heat preservation temperature X2 ℃ at a second heating rate T2 ℃/min and keeping the second heat preservation time A2 min.
And step S2, introducing reducing gas carbon monoxide to a third furnace pressure U3Mpa, heating to a third furnace temperature heat preservation temperature X3 ℃ at a third heating rate T3 ℃/min, and keeping the third heat preservation time A for 3 min. And introducing reducing gas methane to a fourth furnace pressure U4Mpa, heating to a fourth furnace temperature heat preservation temperature X4 ℃ at a fourth heating rate T4 ℃/min, and keeping the fourth heat preservation time A4 min. And finally, introducing reducing gas hydrogen to a fifth furnace pressure U5Mpa, cooling to a fifth furnace temperature heat preservation temperature X5 ℃, and keeping the fifth heat preservation time A for 5 min.
And S3, putting the stator core after heat treatment into a vacuumizing bluing furnace, wherein the bluing furnace initial temperature is the sixth furnace temperature heat preservation temperature X6 ℃, introducing steam to the sixth furnace pressure U6Mpa for the first time, and keeping the sixth heat preservation time for A6 min. And (4) cooling to a seventh furnace temperature heat preservation temperature X7 ℃, introducing water vapor again to a seventh furnace pressure U7Mpa, and keeping the seventh heat preservation time A7 min.
And S4, putting the processed stator core into a first vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the eighth furnace temperature heat preservation temperature X8 ℃, introducing nitrogen to the eighth furnace pressure U8Mpa, and keeping the eighth heat preservation time for A8 min. And then putting the stator core into a second vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the ninth furnace temperature heat preservation temperature X9 ℃, introducing nitrogen to the ninth furnace pressure U9Mpa, and keeping the ninth heat preservation time for A9 min. And finally, putting the stator core into a third vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the tenth furnace temperature heat preservation temperature X10 ℃, introducing nitrogen to the tenth furnace pressure U10Mpa, and keeping the tenth heat preservation time A10 min.
Example 2
In this embodiment 2, the first protective gas is helium, the second protective gas is argon, the first reducing gas is carbon monoxide, the second reducing gas is methane, the third reducing gas is hydrogen, and the third protective gas is nitrogen.
And S1, putting the stator core into a vacuum heat treatment furnace, introducing protective gas helium to a first furnace pressure U1Mpa, heating to a first furnace temperature heat preservation temperature X1 ℃ at a first heating rate T1 ℃/min, and keeping the first heat preservation time A for 1 min. And introducing protective gas argon till the second furnace pressure is U2Mpa, then heating to the second furnace temperature heat preservation temperature X2 ℃ at a second heating rate T2 ℃/min, and keeping the second heat preservation time A for 2 min.
And step S2, introducing reducing gas carbon monoxide to a third furnace pressure U3Mpa, heating to a third furnace temperature heat preservation temperature X3 ℃ at a third heating rate T3 ℃/min, and keeping the third heat preservation time A for 3 min. And introducing reducing gas methane to a fourth furnace pressure U4Mpa, heating to a fourth furnace temperature heat preservation temperature X4 ℃ at a fourth heating rate T4 ℃/min, and keeping the fourth heat preservation time A4 min. And finally, introducing reducing gas hydrogen to a fifth furnace pressure U5Mpa, cooling to a fifth furnace temperature heat preservation temperature X5 ℃, and keeping the fifth heat preservation time A for 5 min.
And S3, putting the stator core after heat treatment into a vacuumizing bluing furnace, wherein the bluing furnace initial temperature is the sixth furnace temperature heat preservation temperature X6 ℃, introducing steam to the sixth furnace pressure U6Mpa for the first time, and keeping the sixth heat preservation time for A6 min. And (4) cooling to a seventh furnace temperature heat preservation temperature X7 ℃, introducing water vapor again to a seventh furnace pressure U7Mpa, and keeping the seventh heat preservation time A7 min.
And S4, putting the processed stator core into a first vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the eighth furnace temperature heat preservation temperature X8 ℃, introducing nitrogen to the eighth furnace pressure U8Mpa, and keeping the eighth heat preservation time for A8 min. And then putting the stator core into a second vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the ninth furnace temperature heat preservation temperature X9 ℃, introducing nitrogen to the ninth furnace pressure U9Mpa, and keeping the ninth heat preservation time for A9 min. And finally, putting the stator core into a third vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the tenth furnace temperature heat preservation temperature X10 ℃, introducing nitrogen to the tenth furnace pressure U10Mpa, and keeping the tenth heat preservation time A10 min.
Example 3
In this embodiment 3, the first protective gas is helium, the second protective gas is argon, the first reducing gas is methane, the second reducing gas is carbon monoxide, the third reducing gas is hydrogen, and the third protective gas is nitrogen.
And S1, putting the stator core into a vacuum heat treatment furnace, introducing protective gas helium to a first furnace pressure U1Mpa, heating to a first furnace temperature heat preservation temperature X1 ℃ at a first heating rate T1 ℃/min, and keeping the first heat preservation time A for 1 min. And introducing protective gas argon till the second furnace pressure is U2Mpa, then heating to the second furnace temperature heat preservation temperature X2 ℃ at a second heating rate T2 ℃/min, and keeping the second heat preservation time A for 2 min.
And S2, introducing reducing gas methane to a third furnace pressure U3Mpa, heating to a third furnace temperature holding temperature X3 ℃ at a third heating rate T3 ℃/min, and keeping the third holding time A for 3 min. And introducing reducing gas carbon monoxide to a fourth furnace pressure U4Mpa, and then heating to a fourth furnace temperature heat preservation temperature X4 ℃ at a fourth heating rate T4 ℃/min and keeping the fourth heat preservation time A4 min. And finally, introducing reducing gas hydrogen to a fifth furnace pressure U5Mpa, cooling to a fifth furnace temperature heat preservation temperature X5 ℃, and keeping the fifth heat preservation time A for 5 min.
And S3, putting the stator core after heat treatment into a vacuumizing bluing furnace, wherein the bluing furnace initial temperature is the sixth furnace temperature heat preservation temperature X6 ℃, introducing steam to the sixth furnace pressure U6Mpa for the first time, and keeping the sixth heat preservation time for A6 min. And (4) cooling to a seventh furnace temperature heat preservation temperature X7 ℃, introducing water vapor again to a seventh furnace pressure U7Mpa, and keeping the seventh heat preservation time A7 min.
And S4, putting the processed stator core into a first vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the eighth furnace temperature heat preservation temperature X8 ℃, introducing nitrogen to the eighth furnace pressure U8Mpa, and keeping the eighth heat preservation time for A8 min. And then putting the stator core into a second vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the ninth furnace temperature heat preservation temperature X9 ℃, introducing nitrogen to the ninth furnace pressure U9Mpa, and keeping the ninth heat preservation time for A9 min. And finally, putting the stator core into a third vacuum-pumping cooling furnace, wherein the initial temperature of the cooling furnace is the tenth furnace temperature heat preservation temperature X10 ℃, introducing nitrogen to the tenth furnace pressure U10Mpa, and keeping the tenth heat preservation time A10 min.
The comparison between the conventional heat treatment technique and the example 1/example 2 of the present invention is shown in table 5, in which the sample 1 has an outer diameter of the motor stator of 100mm and an axial length of 120mm, and the sample 2 has an outer diameter of the motor stator of 220mm and an axial length of 120 mm.
TABLE 5 comparison of Heat treatment techniques
Under the condition that parameters such as furnace pressure, heating rate, furnace temperature, heat preservation duration and the like are different, the reduction of the iron core loss by heat treatment is also different.
For the stator core with the outer diameter of the stator being equal to or larger than 220mm, different parameters are shown in tables 6-9, and the heat treatment test results corresponding to 34 schemes are shown in table 10.
TABLE 6 furnace pressure parameters for various protocols
TABLE 7 ramp Rate parameters for various protocols
TABLE 8 furnace temperature holding temperature parameters for various schemes
TABLE 9 furnace temperature holding time duration parameter
TABLE 10 iron losses for various schemes
The heat treatment process of the motor iron core for the new energy vehicle, provided by the invention, has the following beneficial effects:
1) through the step S1, the stator core is initially preheated, and the stability of the crystal structure is ensured;
2) through the step S2, carrying out heat treatment, eliminating internal stress generated by punching and welding the stator core, and enabling crystal grains to be recrystallized and regrown, and improving the magnetic conductivity of the stator core;
3) through the step S3, water vapor is introduced for the first time to carry out bluing treatment, a silicon dioxide protective film is formed on the surface of the iron core, water vapor is introduced again to carry out secondary bluing treatment, and a more compact silicon dioxide protective film is formed, so that the silicon dioxide protective film is not damaged under the condition that the motor stator and the motor shell are in interference fit, and the eddy current loss of the stator iron core is reduced;
4) through step S4, cooling is performed in temperature stages under the protective atmosphere of nitrogen gas, so as to ensure the stability of the stator core after heat treatment.
While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.
Claims (10)
1. A heat treatment process for a motor iron core for a new energy vehicle is characterized by comprising the following steps:
s1, putting the stator core into a vacuum heat treatment furnace, firstly introducing first protective gas until the first furnace pressure U1Mpa, then heating to the first furnace temperature heat preservation temperature X1 ℃ at a first heating rate T1 ℃/min and keeping the first heat preservation time A1min, then introducing second protective gas until the second furnace pressure U2Mpa, then heating to the second furnace temperature heat preservation temperature X2 ℃ at a second heating rate T2 ℃/min and keeping the second heat preservation time A2 min;
s2, introducing a first reducing gas to a third furnace pressure U3Mpa, then heating to a third furnace temperature heat preservation temperature X3 ℃ at a third heating rate T3 ℃/min and keeping the third heat preservation time for A3min, introducing a second reducing gas to a fourth furnace pressure U4Mpa, then heating to a fourth furnace temperature heat preservation temperature X4 ℃ at a fourth heating rate T4 ℃/min and keeping the fourth heat preservation time for A4min, finally introducing a third reducing gas to a fifth furnace pressure U5Mpa, cooling to a fifth furnace temperature heat preservation temperature X5 ℃ and keeping the fifth heat preservation time for A5 min;
s3, placing the stator core after heat treatment into a vacuumizing bluing furnace, wherein the bluing furnace initial temperature is the sixth furnace temperature heat preservation temperature X6 ℃, introducing water vapor to the sixth furnace pressure U6Mpa for the first time, keeping the sixth heat preservation time for A6min, cooling to the seventh furnace temperature heat preservation temperature X7 ℃, introducing water vapor to the seventh furnace pressure U7Mpa again, and keeping the seventh heat preservation time for A7 min;
and S4, placing the processed stator core into a first vacuum-pumping cooling furnace, wherein the initial temperature of the first cooling furnace is the eighth furnace temperature heat preservation temperature X8 ℃, introducing third protective gas to an eighth furnace pressure U8Mpa, keeping the eighth heat preservation time for A8min, then placing the stator core into a second vacuum-pumping cooling furnace, the initial temperature of the cooling furnace is the ninth furnace temperature heat preservation temperature X9 ℃, introducing third protective gas to a ninth furnace pressure U9Mpa, keeping the ninth heat preservation time for A9min, placing the stator core into the third vacuum-pumping cooling furnace, the initial temperature of the cooling furnace is the tenth furnace temperature heat preservation temperature X10 ℃, introducing third protective gas to a tenth furnace pressure U10Mpa, and keeping the tenth heat preservation time for A10 min.
2. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein in the step S1, the first protective gas is argon, and the second protective gas is helium.
3. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein in the step S1, the first protective gas is helium, and the second protective gas is argon.
4. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein in step S2, the first reducing gas is carbon monoxide, the second reducing gas is methane, and the third reducing gas is hydrogen.
5. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein in step S2, the first reducing gas is methane, the second reducing gas is carbon monoxide, and the third reducing gas is hydrogen.
6. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein in the step S4, the third protective gas is nitrogen.
7. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein the range of the furnace pressure parameter is as shown in the following table 1:
TABLE 1 furnace pressure parameters
8. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein the range of the temperature rise rate parameter is as shown in the following table 2:
TABLE 2 Rate of heating
9. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein the furnace temperature holding temperature parameter has a value range as shown in the following table 3:
TABLE 3 furnace temperature holding temperature parameters
10. The heat treatment process for the motor iron core for the new energy vehicle according to claim 1, wherein the value range of the heat preservation duration parameter is shown in the following table 4:
TABLE 4 Heat preservation duration parameter
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006077305A (en) * | 2004-09-10 | 2006-03-23 | Sumitomo Metal Ind Ltd | Nonoriented silicon steel sheet, nonoriented silicon steel sheet for aging heat treatment, and method for producing them |
| CN102586566A (en) * | 2012-03-15 | 2012-07-18 | 青岛海立美达电机有限公司 | Heat treatment process for iron core of motor |
| JP2016125086A (en) * | 2014-12-26 | 2016-07-11 | 株式会社三井ハイテック | Heat treatment method and plate |
| CN107119178A (en) * | 2017-05-03 | 2017-09-01 | 南通长江电器实业有限公司 | A kind of dynamo sheet annealing process |
| CN107739785A (en) * | 2017-09-22 | 2018-02-27 | 宁国井田机电有限公司 | A kind of idle call stator core Technology for Heating Processing |
| CN111020131A (en) * | 2019-12-24 | 2020-04-17 | 东莞市大忠电子有限公司 | Annealing process of silicon steel iron core |
-
2021
- 2021-08-12 CN CN202110923618.5A patent/CN113564325B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006077305A (en) * | 2004-09-10 | 2006-03-23 | Sumitomo Metal Ind Ltd | Nonoriented silicon steel sheet, nonoriented silicon steel sheet for aging heat treatment, and method for producing them |
| CN102586566A (en) * | 2012-03-15 | 2012-07-18 | 青岛海立美达电机有限公司 | Heat treatment process for iron core of motor |
| JP2016125086A (en) * | 2014-12-26 | 2016-07-11 | 株式会社三井ハイテック | Heat treatment method and plate |
| CN107119178A (en) * | 2017-05-03 | 2017-09-01 | 南通长江电器实业有限公司 | A kind of dynamo sheet annealing process |
| CN107739785A (en) * | 2017-09-22 | 2018-02-27 | 宁国井田机电有限公司 | A kind of idle call stator core Technology for Heating Processing |
| CN111020131A (en) * | 2019-12-24 | 2020-04-17 | 东莞市大忠电子有限公司 | Annealing process of silicon steel iron core |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114703346A (en) * | 2022-05-17 | 2022-07-05 | 广德亿盛精密科技有限公司 | High-frequency heating and water cooling process for motor iron core of new energy automobile |
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