Method for preparing Mn alloy at low temperature

Abstract

The invention relates to the field of low-temperature alloy preparation, in particular to a method for preparing Mn alloy at low temperature, which comprises the following steps: calculating the variance of weight according to the actual weight of each alloy raw material in alloy raw materials; the layering performance of the alloy raw materials and the mixing mode of the alloy raw materials are determined; collecting an upper surface image of the mixed powder to obtain the distribution density of each alloy raw material and calculating the variance of the distribution density of the alloy raw materials; the mixing uniformity in the mixing process is judged according to the variance of the distribution density, and whether the mixed powder is guided into a cold press in an upper and lower layer alternate feeding mode or not is determined; the pressing strength and the pressing duration after the lower half layer of mixed powder is introduced are adjusted according to the surface sedimentation area proportion of the green body in the cold press; pressing the mixed powder to form a basic green body; and sintering and cooling the basic blank in sequence to form a target manganese alloy finished product. The production efficiency and the quality of the manganese alloy finished product are improved.

Description

Technical Field

[0001] The invention relates to the field of low-temperature alloy preparation, and in particular to a method for preparing a Mn alloy at low temperature. Background Art

[0002] With the continuous development of modern industry, the demand for high-performance alloy materials is growing. As an important alloy material, manganese alloy is widely used in many fields, such as steel metallurgy, aerospace, electronics and electrical appliances, etc. The traditional method of preparing manganese alloys usually needs to be carried out under high temperature conditions, which not only consumes a lot of energy, but also may cause problems such as volatilization and oxidation of elements in the alloy, thereby affecting the performance of the alloy. Low-temperature preparation can reduce energy consumption, reduce the volatilization and oxidation of elements, and improve the purity and performance stability of the alloy. However, the current low-temperature preparation method of manganese alloys still has some shortcomings. For example, in the process of mixing powders, it is difficult to ensure the uniformity of mixing, which may affect the performance of the alloy. In the cold pressing process, how to adjust the pressing parameters according to the characteristics of the blank is also a challenge. In addition, parameter control during sintering and cooling also has an important influence on the final performance of the alloy. Therefore, a more complete method for preparing manganese alloys at low temperatures is needed, which can effectively solve the above problems and improve the preparation efficiency and performance quality of manganese alloys.

[0003] Chinese patent publication number CN118389943A discloses a high manganese alloy medium and thick plate with excellent ultra-low temperature strength and toughness matching and a preparation method, including: using a Fe-Mn-Al-C chemical composition system, combined with controlled rolling and controlled cooling processes, and through high-temperature rolling, the deformed austenite structure is completely recrystallized into a distortion-free equiaxed austenite structure, thereby improving the plastic deformation ability of high manganese austenitic steel, thereby obtaining a complex alloyed high manganese medium and thick plate for ultra-low temperature domains with excellent ultra-low temperature strength and toughness matching. It can be seen that the high manganese alloy medium and thick plate with excellent ultra-low temperature strength and toughness matching and the preparation method of the invention have the problem of uneven mixing of the alloy raw materials due to the lack of a method for adding alloy raw materials, which in turn leads to material failure due to poor local performance of the blank in an ultra-low temperature environment. Summary of the invention

[0004] To this end, the present invention provides a method for preparing Mn alloy at low temperature, so as to overcome the problem in the prior art that the alloy raw materials are not mixed evenly due to the lack of a method for adding alloy raw materials, and further lead to material failure due to poor local performance of the blank in an ultra-low temperature environment.

[0005] To achieve the above object, the present invention provides a method for preparing a Mn alloy at low temperature, comprising: Calculating the weight variance based on the actual weight of each alloying material in the alloying materials; Determining the stratification performance of the alloy raw materials and a mixing method of the alloy raw materials according to the weight variance, wherein the mixing method includes a first mixing method and a second mixing method; After the mixer is controlled to complete mixing of the alloy raw materials according to the first mixing mode to output a mixed powder, an upper surface image of the mixed powder is collected to obtain a distribution density of each alloy raw material; Calculating the variance of the distribution density of the alloy raw materials according to the distribution density of each alloy raw material; Determining mixing uniformity of the mixing process according to the variance of the distribution density; Determine whether to introduce the mixed powder into the cold press by alternating upper and lower layers according to the mixing uniformity; Adjusting the pressing strength and pressing time after the lower half layer of mixed powder is introduced according to the surface settlement area ratio of the green body in the cold press; Pressing the mixed powder according to the pressing strength and the pressing time to form a basic green body; The basic green body is sequentially sintered and cooled to form a target manganese alloy product; Among them, the first mixing method is to adjust the feeding method of the alloy raw materials during the mixing process; the second mixing method is to determine the motor speed of the mixer according to the linear fit between the temperature of the mixed powder and the change in the vibration frequency of the mixer.

[0006] Further, determining the stratification performance of the alloy raw materials and the mixing method of the alloy raw materials according to the weight variance includes: Comparing the variance of the weight with a preset first variance and a preset second variance respectively; If the variance of the weight is greater than the preset first variance and less than or equal to the preset second variance, it is determined that the stratification performance of the alloy raw materials meets the requirements, the first mixing method is selected to mix the alloy raw materials, and the random delivery method is adjusted to a delivery method that determines the delivery priority according to the actual weight of each alloy raw material; If the weight variance is greater than the preset second variance, it is determined that the stratification performance of the alloy raw material does not meet the requirements, and the second mixing method is selected to mix the alloy raw materials.

[0007] Furthermore, the delivery priority is positively correlated with the actual weight of a single alloy raw material.

[0008] Furthermore, collecting the upper surface image of the mixed powder to obtain the distribution density of each alloy raw material includes: Using an industrial camera to collect an image of the upper surface of the mixed powder; identifying the number of particles of each alloy raw material and the total area of ​​the upper surface in the upper surface image; Calculating the distribution density of each alloy raw material according to the number of particles of each alloy raw material; The distribution density of each alloy raw material is the ratio of the number of particles of each alloy raw material in the upper surface image to the total area of ​​the upper surface.

[0009] Further, determining the mixing uniformity of the mixing process according to the variance of the distribution density includes: If the variance of the distribution density is greater than the variance of the preset distribution density, it is determined that the mixing degree of the mixing process does not meet the requirements; If the variance of the distribution density is less than or equal to the variance of the preset distribution density, it is determined that the mixing degree of the mixing process meets the requirements.

[0010] Further, determining whether to introduce the mixed powder into the cold press by alternating upper and lower layer feeding according to the mixing uniformity includes: When the mixing degree of the mixing process does not meet the requirements, the mixed powder is divided into several layers in order from top to bottom; The layered mixed powders are introduced into the cold press in sequence by alternating feeding method; The alternating feeding method is to start from the top layer and introduce all the mixed powders into the cold press in the order of upper layer-bottom layer-upper layer cycle.

[0011] Further, the pressing strength and pressing time after the lower half layer of mixed powder is introduced are adjusted according to the surface settlement area ratio of the green body in the cold press, including: Collecting a surface image of the green body; Performing grayscale processing on the surface image of the green body to obtain the surface sedimentation area of ​​the green body; Calculating the surface settlement area ratio of the green body according to the surface settlement area of ​​the green body; If the surface sedimentation area ratio is greater than the preset area ratio, it is determined that the structural integrity of the blank does not meet the requirements, and the pressing strength and pressing time after the lower half layer of mixed powder is introduced are increased.

[0012] Furthermore, the surface settlement area ratio is the ratio of the area of ​​the surface of the blank where settlement occurs to the total surface area of ​​the blank.

[0013] Further, judging whether to reduce the motor speed of the mixer according to the linear fit between the temperature of the mixed powder and the change in the vibration frequency of the mixer comprises: respectively collecting the temperature of the mixed powder and the variation of the vibration frequency of the mixer; Calculating the linear fit of the temperature of the mixed powder and the change in the vibration frequency of the mixer; If the linear fit is greater than a preset linear fit, reducing the motor speed of the mixer; The variation of the vibration frequency is the absolute value of the difference between the actual vibration frequency of the mixer and the standard vibration frequency.

[0014] Furthermore, the alloy raw material is composed of component raw materials in the following weight ratio: manganese powder: aluminum powder: iron powder: copper powder: zinc powder = 5:2:1:1:1.

[0015] Compared with the prior art, the beneficial effects of the present invention lie in that the method of the present invention determines the stratification performance of the alloy raw materials and the mixing mode of the alloy raw materials according to the weight variance, adjusts the pressing strength and pressing time of the lower half layer of mixed powder after the introduction according to the surface settlement area ratio of the blank in the cold press, and determines the stratification performance of the alloy raw materials and the mixing mode of the alloy raw materials according to the weight variance, thereby overcoming the problem that the chemical composition stability and uniformity of the manganese alloy finished product do not meet the requirements due to the different weight ranges of different alloy raw materials, thereby improving the quality of the alloy finished product.

[0016] Furthermore, the method of the present invention overcomes the problem that the uniformity of alloy raw materials of different weights may change during the mixing process of the powder mixer, resulting in the strength, toughness and density of the pressed blank not meeting the requirements, by setting the variance of the preset distribution density, thereby improving the effect of the alloy powder mixing process.

[0017] Furthermore, the method of the present invention overcomes the problem that different layers of powder cannot be fully contacted and mixed in the stirring device due to the different weights of different alloy raw materials by alternating feeding, and enhances the stirring effect by layering the alloy raw materials.

[0018] Furthermore, the method of the present invention overcomes the problem that the bottom layer of the blank is not compacted enough during the pressing process, has many pores or has an uneven surface due to the pressing strength not meeting the requirements, or the problem that the alloy raw material particles have insufficient time to rearrange and tightly combine due to the pressing time not meeting the requirements by setting a preset area ratio. By installing a camera near the blank inside the cold press to monitor the surface settlement area of ​​the blank, real-time visual monitoring of the blank forming process is achieved.

[0019] Furthermore, the method of the present invention adjusts the motor speed of the mixer by linearly fitting the temperature of the mixed powder and the change in the vibration frequency of the mixer, thereby overcoming the problem of uneven mixing of alloy raw materials caused by accumulation between different metal powders due to softening of the mixed powder structure, thereby achieving improved mixing uniformity of the alloy raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall flow chart of the method for preparing Mn alloy at low temperature according to an embodiment of the present invention; Figure 2 A flow chart of obtaining the distribution density of each alloy raw material in the method for preparing Mn alloy at low temperature according to an embodiment of the present invention; Figure 3 This is a flow chart of sequentially sintering and cooling a basic blank in a method for preparing a Mn alloy at a low temperature according to an embodiment of the present invention; Figure 4 The figure is a logic flow chart of the method for preparing Mn alloy at low temperature according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0023] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in this specification refers to the presence of features, integers, steps, operations, elements / components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements / components. It should be understood that when we refer to a module as being "connected" or "coupled" to another module, it may be directly connected or coupled to the other module, or there may be an intermediate unit. In addition, "connected" or "coupled" used herein may include wireless connection or wireless coupling.

[0024] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall flow chart of the method for preparing Mn alloy at low temperature according to an embodiment of the present invention, a flow chart for obtaining the distribution density of each alloy raw material, a flow chart for sequentially sintering and cooling the basic blank, and a logic flow chart; an embodiment of the present invention provides a method for preparing Mn alloy at low temperature, comprising: Step S1, calculating the weight variance according to the actual weight of each alloy raw material in the alloy raw materials; Step S2, determining the stratification performance of the alloy raw materials and a mixing method of the alloy raw materials according to the weight variance, wherein the mixing method includes a first mixing method and a second mixing method; Step S3, after the mixer is controlled to complete mixing of the alloy raw materials according to the first mixing mode to output a mixed powder, an upper surface image of the mixed powder is collected to obtain a distribution density of each alloy raw material; Step S4, calculating the variance of the distribution density of the alloy raw materials according to the distribution density of each alloy raw material; Step S5, determining the mixing uniformity of the mixing process according to the variance of the distribution density; Step S6, determining whether to introduce the mixed powder into the cold press by alternating upper and lower layer feeding according to the mixing uniformity; Step S7, adjusting the pressing strength and pressing time of the lower half layer of mixed powder after introduction according to the surface settlement area ratio of the green body in the cold press; Step S8, pressing the mixed powder according to the pressing strength and the pressing time to form a basic green body; Step S9, sintering and cooling the basic blank in sequence to form a target manganese alloy product; Among them, the first mixing method is to adjust the feeding method of the alloy raw materials during the mixing process; the second mixing method is to determine the motor speed of the mixer according to the linear fit between the temperature of the mixed powder and the change in the vibration frequency of the mixer.

[0025] Specifically, the stratified performance refers to the distribution characteristics of different levels exhibited by different alloy raw materials when mixed due to their different weights.

[0026] Specifically, the weight variance is the weight variance of manganese powder, aluminum powder, iron powder, copper powder and zinc powder. The calculation process of the weight variance is a conventional technical means well known to those skilled in the art, and the calculation process of the weight variance will not be repeated here.

[0027] In implementation, the beneficial effects of the present invention are that the method of the present invention determines the stratification performance of the alloy raw materials and the mixing mode of the alloy raw materials according to the weight variance, adjusts the pressing strength and pressing time of the lower half layer of mixed powder after the introduction according to the surface settlement area ratio of the blank in the cold press, and determines the stratification performance of the alloy raw materials and the mixing mode of the alloy raw materials according to the weight variance, thereby overcoming the problem that the chemical composition stability and uniformity of the manganese alloy finished product do not meet the requirements due to the different weight ranges of different alloy raw materials, thereby improving the quality of the alloy finished product.

[0028] Specifically, determining the stratification performance of the alloy raw materials and the mixing method of the alloy raw materials according to the weight variance includes: Comparing the variance of the weight with a preset first variance and a preset second variance respectively; If the variance of the weight is greater than the preset first variance and less than or equal to the preset second variance, it is determined that the stratification performance of the alloy raw materials meets the requirements, the first mixing method is selected to mix the alloy raw materials, and the random delivery method is adjusted to a delivery method that determines the delivery priority according to the actual weight of each alloy raw material; If the weight variance is greater than the preset second variance, it is determined that the stratification performance of the alloy raw material does not meet the requirements, and the second mixing method is selected to mix the alloy raw materials.

[0029] Specifically, the delivery priority is positively correlated with the actual weight of a single alloy raw material.

[0030] Specifically, the order of the placement priority is the order in which the alloy raw materials are arranged from small to large according to actual weight.

[0031] Optionally, the preset first variance value range may be [3g 2 , 8g 2 ], the value range of the preset second variance can be [8g 2 , 13g 2 ]; Preferably, the preferred embodiment of the preset first variance is 5g 2 The preferred embodiment of the preset second variance is 10g 2 .

[0032] Specifically, collecting the upper surface image of the mixed powder to obtain the distribution density of each alloy raw material includes: Using an industrial camera to collect an image of the upper surface of the mixed powder; identifying the number of particles of each alloy raw material and the total area of ​​the upper surface in the upper surface image; Calculating the distribution density of each alloy raw material according to the number of particles of each alloy raw material; The distribution density of each alloy raw material is the ratio of the number of particles of each alloy raw material in the upper surface image to the total area of ​​the upper surface.

[0033] Specifically, determining the mixing uniformity of the mixing process according to the variance of the distribution density includes: If the variance of the distribution density is greater than the variance of the preset distribution density, it is determined that the mixing degree of the mixing process does not meet the requirements; If the variance of the distribution density is less than or equal to the variance of the preset distribution density, it is determined that the mixing degree of the mixing process meets the requirements.

[0034] Specifically, the analysis software for analyzing the proportion of each alloy powder in a single area is ImageJ software.

[0035] Specifically, the variance of the distribution density of the alloy raw material is the variance of the distribution density of the alloy raw material in several regions of equal area. The calculation process of the variance of the distribution density of the alloy raw material is a conventional technical means well known to those skilled in the art, and the calculation process of the variance of the distribution density of the alloy raw material will not be repeated here.

[0036] Optionally, the variance of the preset distribution density may be in the range of [0.5 g / mm 2 , 1.2g / mm 2 ].

[0037] Preferably, the preferred embodiment of the variance of the preset distribution density is 0.7 g / mm 2 .

[0038] In implementation, the method of the present invention overcomes the problem that the uniformity of alloy raw materials of different weights will change during the mixing process of the powder mixer, resulting in the strength, toughness and density of the pressed blank not meeting the requirements by setting the variance of the preset distribution density, thereby improving the effect of the alloy powder mixing process.

[0039] Specifically, the device for storing the alloy raw materials exported by the mixer is a double-outlet rotary mixing container, and the industrial camera is arranged on the inner wall of the mixed powder feed inlet channel in the double-outlet rotary mixing container.

[0040] Specifically, determining whether to introduce the mixed powder into the cold press by alternating upper and lower layers according to the mixing uniformity includes: When the mixing degree of the mixing process does not meet the requirements, the mixed powder is divided into several layers in order from top to bottom; The layered mixed powders are introduced into the cold press in sequence by alternating feeding method; The alternating feeding method is to start from the top layer and introduce all the mixed powders into the cold press in the order of upper layer-bottom layer-upper layer cycle.

[0041] In practice, the method of the present invention overcomes the problem that different layers of powder cannot be fully contacted and mixed in a stirring device due to the different weights of different alloy raw materials by alternating feeding, and enhances the stirring effect by layering the alloy raw materials.

[0042] Specifically, the pressing strength and pressing time after the lower half layer of mixed powder is introduced are adjusted according to the surface settlement area ratio of the green body in the cold press, including: Collecting a surface image of the green body; Performing grayscale processing on the surface image of the green body to obtain the surface sedimentation area of ​​the green body; Calculating the surface settlement area ratio of the green body according to the surface settlement area of ​​the green body; If the surface sedimentation area ratio is greater than the preset area ratio, it is determined that the structural integrity of the blank does not meet the requirements, and the pressing strength and pressing time after the lower half layer of mixed powder is introduced are increased.

[0043] Specifically, the surface image of the blank is acquired by a camera disposed inside the cold press near the blank.

[0044] Optionally, the preset area ratio may be in the range of [5%, 10%]; Preferably, the preferred embodiment of the preset area ratio is 7%; In a specific embodiment, the surface settlement area accounts for 9%, which is greater than the preset area proportion. For every 1% that the surface settlement area accounts for, which is greater than the preset area proportion, the pressing intensity increases by 1.5 MPa compared with the current pressing intensity, and the pressing time increases by 3 s compared with the current pressing time. The current pressing intensity is 55 MPa, and the current pressing time is 90 s. The increased vertical pressing intensity is 55 + (9-7) × 1.5 = 58 MPa, and the increased pressing time is 90 + (9-7) × 3 = 96 s.

[0045] Specifically, the surface settlement area ratio is the ratio of the area of ​​the surface of the blank where settlement occurs to the total surface area of ​​the blank.

[0046] In implementation, the method of the present invention overcomes the problem that the bottom layer of the blank is not compacted enough during the pressing process, has many pores or has an uneven surface due to the pressing strength not meeting the requirements, or the problem that the alloy raw material particles have insufficient time to rearrange and tightly combine due to the pressing time not meeting the requirements by setting a preset area ratio. By installing a camera near the blank inside the cold press to monitor the surface settlement area of ​​the blank, real-time visual monitoring of the blank forming process is achieved.

[0047] Specifically, judging whether to reduce the motor speed of the mixer according to the linear fit between the temperature of the mixed powder and the change in the vibration frequency of the mixer includes: respectively collecting the temperature of the mixed powder and the stacking area of ​​the mixed powder; Calculating a linear fit between the temperature of the mixed powder and the stacking area of ​​the mixed powder; If the linear fit is greater than a preset linear fit, reducing the motor speed of the mixer; The variation of the vibration frequency is the absolute value of the difference between the actual vibration frequency of the mixer and the standard vibration frequency.

[0048] Optionally, the preset linear fit value range may be [0.6, 0.8].

[0049] Preferably, the preferred embodiment of the preset linear fit degree is 0.7.

[0050] In one or more specific embodiments, the linear fit is 0.9, which is greater than the preset linear fit. For every 0.1 that the linear fit is greater than the preset linear fit, the motor speed of the mixer is reduced by 50 r / min compared with the current motor speed of the mixer. The current motor speed of the mixer is 1200 r / min, and the reduced motor speed of the mixer is 1200-[(0.9-0.7)] / 0.1×50=1100 r / min.

[0051] Specifically, the actual vibration frequency of the mixer is monitored by a laser Doppler vibration meter, and the temperature of the mixed powder is acquired by a temperature sensor disposed above the inner wall of the mixer.

[0052] Specifically, the linear fit of the temperature of the mixed powder and the change in the vibration frequency of the mixer is obtained by taking the temperature of the mixed powder collected at several sampling moments as the horizontal coordinate and the change in the vibration frequency of the mixer collected and calculated at several sampling moments as the vertical coordinate, thereby establishing a rectangular coordinate system and several coordinate points of the temperature of the mixed powder and the change in the vibration frequency of the mixer, and performing linear regression calculation on the several coordinate points to obtain the linear fit of the temperature of the mixed powder and the change in the vibration frequency of the mixer. It can be understood by those skilled in the art that the calculation process and method of the linear fit of the temperature of the mixed powder and the change in the vibration frequency of the mixer are conventional technical means well known to those skilled in the art, and therefore the calculation process of the linear fit of the temperature of the mixed powder and the change in the vibration frequency of the mixer will not be repeated here.

[0053] In implementation, the method of preparing Mn alloy at low temperature of the present invention adjusts the speed of the mixer motor by the linear fitting degree of the temperature of the mixed powder and the stacking area of ​​the mixed powder, thereby overcoming the problem of uneven mixing effect of the alloy raw materials caused by stacking between different metal powders due to softening of the mixed powder structure, and achieving improved mixing uniformity of the alloy raw materials.

[0054] Specifically, in step S7, the basic green body is sintered and cooled in sequence, including: placing the basic green body into a sintering furnace; The sintering temperature is set to 600° C., argon gas is introduced into the sintering furnace, and low-temperature sintering is performed to output an alloy blank; The alloy blank is naturally cooled to room temperature for 10 minutes to output the target manganese alloy product.

[0055] Specifically, the alloy raw material is composed of component raw materials in the following weight ratio: manganese powder: aluminum powder: iron powder: copper powder: zinc powder = 5:2:1:1:1.

[0056] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for preparing a Mn alloy at low temperature, characterized in that: include: Calculating the weight variance based on the actual weight of each alloying material in the alloying materials; Determining the stratification performance of the alloy raw materials and a mixing method of the alloy raw materials according to the weight variance, wherein the mixing method includes a first mixing method and a second mixing method; After the mixer is controlled to complete mixing of the alloy raw materials according to the first mixing mode to output a mixed powder, an upper surface image of the mixed powder is collected to obtain a distribution density of each alloy raw material; Calculating the variance of the distribution density of the alloy raw materials according to the distribution density of each alloy raw material; Determining mixing uniformity of the mixing process according to the variance of the distribution density; Determine whether to introduce the mixed powder into the cold press by alternating upper and lower layers according to the mixing uniformity; Adjusting the pressing strength and pressing time after the lower half layer of mixed powder is introduced according to the surface settlement area ratio of the green body in the cold press; Pressing the mixed powder according to the pressing strength and the pressing time to form a basic green body; The basic green body is sequentially sintered and cooled to form a target manganese alloy product; Among them, the first mixing method is to adjust the feeding method of the alloy raw materials during the mixing process; the second mixing method is to determine the motor speed of the mixer according to the linear fit between the temperature of the mixed powder and the change in the vibration frequency of the mixer.

2. The method for preparing a Mn alloy at low temperature according to claim 1, characterized in that: Determining the layering properties of the alloy raw materials and the mixing method of the alloy raw materials according to the weight variance includes: Comparing the variance of the weight with a preset first variance and a preset second variance respectively; If the variance of the weight is greater than the preset first variance and less than or equal to the preset second variance, it is determined that the stratification performance of the alloy raw materials meets the requirements, the first mixing method is selected to mix the alloy raw materials, and the random delivery method is adjusted to a delivery method that determines the delivery priority according to the actual weight of each alloy raw material; If the weight variance is greater than the preset second variance, it is determined that the stratification performance of the alloy raw material does not meet the requirements, and the second mixing method is selected to mix the alloy raw materials.

3. The method for preparing Mn alloy at low temperature according to claim 2, characterized in that: The placement priority is positively correlated with the actual weight of the single alloy raw material.

4. The method for preparing Mn alloy at low temperature according to claim 3, characterized in that: The collecting of the upper surface image of the mixed powder to obtain the distribution density of each alloy raw material includes: Using an industrial camera to collect an image of the upper surface of the mixed powder; identifying the number of particles of each alloy raw material and the total area of ​​the upper surface in the upper surface image; Calculating the distribution density of each alloy raw material according to the number of particles of each alloy raw material; The distribution density of each alloy raw material is the ratio of the number of particles of each alloy raw material in the upper surface image to the total area of ​​the upper surface.

5. The method for preparing Mn alloy at low temperature according to claim 4, characterized in that: Determining the mixing uniformity of the mixing process according to the variance of the distribution density includes: If the variance of the distribution density is greater than the variance of the preset distribution density, it is determined that the mixing degree of the mixing process does not meet the requirements; If the variance of the distribution density is less than or equal to the variance of the preset distribution density, it is determined that the mixing degree of the mixing process meets the requirements.

6. The method for preparing Mn alloy at low temperature according to claim 5, characterized in that: Determining whether to introduce the mixed powder into the cold press by alternating upper and lower layers according to the mixing uniformity includes: When the mixing degree of the mixing process does not meet the requirements, the mixed powder is divided into several layers in order from top to bottom; The layered mixed powders are introduced into the cold press in sequence by alternating feeding method; The alternating feeding method is to start from the top layer and introduce all the mixed powders into the cold press in the order of upper layer-bottom layer-upper layer cycle.

7. The method for preparing a Mn alloy at low temperature according to claim 6, characterized in that: According to the surface settlement area ratio of the green body in the cold press, the pressing strength and pressing time after the lower half layer of mixed powder is introduced are adjusted, including: Collecting a surface image of the green body; Performing grayscale processing on the surface image of the green body to obtain the surface sedimentation area of ​​the green body; Calculating the surface settlement area ratio of the green body according to the surface settlement area of ​​the green body; If the surface sedimentation area ratio is greater than the preset area ratio, it is determined that the structural integrity of the blank does not meet the requirements, and the pressing strength and pressing time after the lower half layer of mixed powder is introduced are increased.

8. The method for preparing a Mn alloy at low temperature according to claim 7, characterized in that: The surface sedimentation area ratio is the ratio of the surface sedimentation area of ​​the blank to the total surface area of ​​the blank.

9. The method for preparing a Mn alloy at low temperature according to claim 8, characterized in that: Judging whether to reduce the motor speed of the mixer according to the linear fit between the temperature of the mixed powder and the change in the vibration frequency of the mixer comprises: respectively collecting the temperature of the mixed powder and the variation of the vibration frequency of the mixer; Calculating the linear fit of the temperature of the mixed powder and the change in the vibration frequency of the mixer; If the linear fit is greater than a preset linear fit, reducing the motor speed of the mixer; The variation of the vibration frequency is the absolute value of the difference between the actual vibration frequency of the mixer and the standard vibration frequency.

10. The method for preparing a Mn alloy at low temperature according to claim 9, characterized in that: The alloy raw material is composed of component raw materials in the following weight ratio: manganese powder: aluminum powder: iron powder: copper powder: zinc powder = 5:2:1:1:1.

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