CN117990163B - Automatic performance detection system and method for NdFeB (neodymium iron boron) thin sheet - Google Patents
Automatic performance detection system and method for NdFeB (neodymium iron boron) thin sheet Download PDFInfo
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Abstract
The invention discloses an automatic performance detection system and method for neodymium iron boron thin sheets, which relate to the technical field of neodymium iron boron thin sheet detection, wherein a flaw index is output for the neodymium iron boron thin sheets after a plurality of process data are analyzed according to a flaw analysis model, the neodymium iron boron thin sheets are marked into a non-flaw set, a slight flaw set or a serious flaw set after the flaw index of the neodymium iron boron thin sheets is analyzed, if more than two neodymium iron boron thin sheets exist in the serious flaw set, the detection system automatically controls a production line to stop running, if more than two neodymium iron boron thin sheets exist in the slight flaw set, the detection system acquires whether an order requiring the use of the slight flaw set exists in a current order through an order management system, and generates a management decision according to the acquired result. The detection system can effectively detect the hysteresis flaws of the neodymium iron boron sheet, and automatically carries out corresponding management according to the detection results of the hysteresis flaws, so that the follow-up stable use of the neodymium iron boron sheet is effectively ensured.
Description
Technical Field
The invention relates to the technical field of neodymium iron boron sheet detection, in particular to an automatic performance detection system and method for neodymium iron boron sheets.
Background
Neodymium iron boron (NdFeB) is a commonly used rare earth permanent magnet material, and is composed of neodymium, iron and boron, and is one of the strongest permanent magnet materials currently known, and has excellent magnetic properties, a neodymium iron boron sheet is usually a product obtained by processing the neodymium iron boron material into sheets, the sheets can be prepared by various technological methods, the neodymium iron boron sheet is commonly used for manufacturing components such as sensors, motors and electromagnetic coils in electronic equipment, the neodymium iron boron sheet is also widely applied to the fields of magnetic memories, acoustic equipment, magnetic isolation, magnetic sensors and the like, and performance detection needs to be carried out through a detection system after the production of the neodymium iron boron sheet.
The prior art has the following defects:
Because the neodymium iron boron thin sheet is mainly used by electronic equipment, the existing detection system is usually used for detecting appearance, magnetism, size, temperature and mechanical defects of the neodymium iron boron thin sheet after the neodymium iron boron thin sheet is produced, namely, when a certain parameter of the neodymium iron boron thin sheet does not reach the standard, the quality of the neodymium iron boron thin sheet is judged to be unqualified, however, when the neodymium iron boron thin sheet is produced, hysteresis flaws (the normal use of the neodymium iron boron thin sheet cannot be influenced due to the influence of a production process or production equipment in the earlier stage of the hysteresis flaws, but the service life of the neodymium iron boron thin sheet can be shortened, so that the influence on the product use is brought), the existing detection system cannot detect whether the hysteresis flaws exist in the neodymium iron boron thin sheet, and therefore the follow-up stable use of the neodymium iron boron thin sheet cannot be ensured.
Disclosure of Invention
The invention aims to provide an automatic performance detection system and method for neodymium iron boron thin sheets, which are used for solving the defects in the background technology.
In order to achieve the above object, the present invention provides the following technical solutions: the automatic performance detection method of the NdFeB sheet comprises the following steps:
After the production of the neodymium iron boron thin sheet, the detection system carries out multiple index detection on the neodymium iron boron thin sheet, if any index detection of the neodymium iron boron thin sheet is failed, the neodymium iron boron thin sheet is marked as a failed product, if two or more than two neodymium iron boron thin sheets are failed in continuous detection, the detection system automatically controls the production line to stop running, and sends a warning signal to an administrator;
When a plurality of indexes of the neodymium iron boron sheet are detected to be qualified, the detection system acquires a plurality of process data in the production process of the neodymium iron boron sheet, outputs a flaw index for the neodymium iron boron sheet after analyzing the plurality of process data according to a flaw analysis model, and divides the neodymium iron boron sheet into a flaw-free set, a slight flaw set or a serious flaw set after analyzing the flaw index of the neodymium iron boron sheet;
if more than two neodymium iron boron sheets exist in the serious flaw set, the detection system automatically controls the production line to stop running and sends a warning signal to an administrator;
If more than two neodymium iron boron sheets exist in the slight flaw set, the detection system acquires whether the current order has an order requiring the slight flaw set through the order management system, generates a management decision according to the acquired result, and sends the management decision to an administrator.
In a preferred embodiment, the detection system acquires a plurality of process data in the production process of the NdFeB sheet, wherein the plurality of process data comprise a magnetic field fluctuation amplitude value, a temperature deviation value and an atmosphere abnormality coefficient.
In a preferred embodiment, the logic for obtaining the magnitude of the magnetic field fluctuations is:
in the pressing process of the neodymium iron boron sheet, acquiring real-time current of the electromagnetic coil in real time through a current sensor, comparing the real-time current with a preset current stability range, and marking a time period of the real-time current of the electromagnetic coil in the current stability range as an electromagnetic coil current stability time period;
Acquiring real-time pressing speed in the pressing process through an encoder of the pressing machine, comparing the acquired real-time pressing speed in the pressing process with a preset speed range, and marking a period of which the pressing speed is not in the speed range as a pressing speed early warning period;
And carrying out integral operation on the electromagnetic coil current stabilization period and the suppression speed early warning period to obtain the magnetic field fluctuation amplitude.
In a preferred embodiment, the method for outputting the defect index for the neodymium iron boron sheet after analyzing a plurality of process data according to the defect analysis model comprises the following steps:
After the detection system obtains the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient, substituting the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient into the flaw analysis model for comprehensive analysis, and after the flaw analysis model performs standardized processing on the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient, calculating and obtaining the flaw index according to the fact that the magnetic field fluctuation amplitude and the flaw index are in inverse proportion relation, and the temperature deviation value, the atmosphere abnormality coefficient and the flaw index are in direct proportion relation, wherein the function expression is:
，
In the method, in the process of the invention, As an index of the flaws, the method is that,Indicating the overall temperature deviation value of the sintering equipment,Indicating the number of temperature monitoring points,Represent the firstThe temperature deviation values of the temperature monitoring points,The coefficient of the atmosphere abnormality is represented,Representing the magnitude of the magnetic field fluctuations,、、The ratio coefficients of the fluctuation amplitude of the magnetic field, the integral temperature deviation value of the sintering equipment and the atmosphere abnormality coefficient are respectively that、、Are all greater than 0.
In a preferred embodiment, the neodymium iron boron sheet is scored into a non-defective set, a slightly defective set, or a severely defective set by analyzing the defect index of the neodymium iron boron sheet, comprising the steps of:
After obtaining the flaw index, comparing the flaw index with a preset flaw gradient threshold, wherein the flaw gradient threshold comprises a first flaw threshold and a second flaw threshold, the first flaw threshold is smaller than the second flaw threshold, the first flaw threshold is used for judging whether hysteresis flaws exist in the neodymium-iron-boron sheet, and the second flaw threshold is used for judging the severity of the hysteresis flaws of the neodymium-iron-boron sheet;
if the flaw index of the NdFeB sheet is smaller than or equal to the first flaw threshold value, judging that the NdFeB sheet has no hysteresis flaw, and scribing the NdFeB sheet into a flaw-free set;
If the flaw index of the NdFeB sheet is larger than the first flaw threshold and smaller than or equal to the second flaw threshold, judging that the NdFeB sheet has a hysteresis flaw, but the hysteresis flaw is slight, and scribing the NdFeB sheet into a slight flaw set;
If the flaw index of the NdFeB sheet is larger than the second flaw threshold value, judging that the NdFeB sheet has hysteresis flaws and the hysteresis flaws are serious, and scribing the NdFeB sheet into a serious flaw set.
In a preferred embodiment, if more than two neodymium iron boron sheets exist in the slight defect set, the detection system acquires whether an order requiring the slight defect set exists in the current order through the order management system, generates a management decision according to the acquired result, and sends the management decision to an administrator, wherein the detection system comprises the following steps:
The method comprises the steps of monitoring the number of neodymium iron boron sheets in a slight flaw set in real time, if more than two neodymium iron boron sheets exist in the slight flaw set, acquiring whether an order requiring the use of the slight flaw set exists in a current order through an order management system by a detection system, and if the order requiring the use of the slight flaw set does not exist, controlling a production line to stop and sending a warning signal to an administrator by the order detection system requiring the use of the slight flaw set;
if an order requiring a slight flaw set exists, marking the order as a secondary order, acquiring the number of the slight flaw NdFeB sheets required by all the secondary orders by a detection system, and when the number of the NdFeB sheets in the slight flaw set is smaller than or equal to the number of the slight flaw NdFeB sheets required by all the secondary orders in the NdFeB sheet production process, not managing by the detection system; when the number of the neodymium iron boron thin sheets in the slight defect set is larger than that of the neodymium iron boron thin sheets required by all secondary orders, the detection system controls the production line to stop and sends a warning signal to an administrator.
In a preferred embodiment, if two or more neodymium iron boron sheets are continuously detected to be unqualified, the detection system automatically controls the production line to stop running and sends an alarm signal to an administrator, and the method comprises the following steps:
After the unqualified indexes of the neodymium iron boron thin sheets are detected, the detection system automatically marks the neodymium iron boron thin sheets as unqualified products, and when two or more than two neodymium iron boron thin sheets are continuously detected to be unqualified, the detection system automatically controls the production line to stop running and sends a warning signal to an administrator to inform that the condition of continuous unqualified products occurs;
Recording related data of the unqualified products, wherein the related data comprise unqualified indexes, production batches and production time information, and restarting the production line to continue producing the NdFeB sheet after the confirmation problem is solved.
In a preferred embodiment, the logic for obtaining the atmosphere anomaly coefficient is: measuring the real-time atmosphere speed inside the primary sintering equipment through a flow rate sensor at intervals, establishing a sample set of the atmosphere speed obtained at a plurality of measurement time points, calculating the atmosphere average speed and the atmosphere speed standard deviation in the sample set, and obtaining an atmosphere anomaly coefficient by comparing the atmosphere speed standard deviation with the atmosphere average speed, wherein the function expression is as follows:
，
In the method, in the process of the invention, ，Representing the number of measurement time points in the sample set,Represents the atmospheric velocity at the i-th measurement time point,The average velocity of the atmosphere is indicated,Is the standard deviation of the speed of the atmosphere,Is the atmosphere abnormality coefficient.
In a preferred embodiment, the logic for obtaining the temperature deviation value is: in the sintering process of the neodymium iron boron sheet, acquiring the real-time temperature inside the sintering equipment through a temperature sensor, and calculating a temperature deviation value according to the real-time temperature and a temperature stability range, wherein the function expression is as follows:
，
In the method, in the process of the invention, As the value of the deviation of the temperature,In order to achieve a temperature stability range,Is a real-time temperature.
The invention also provides an automatic performance detection system of the NdFeB sheet, which comprises a detection module, a quality analysis module, a data acquisition module, an index calculation module, a set division module, a warning control module and a decision generation module;
and a detection module: after the production of the neodymium iron boron thin sheet, carrying out multiple index detection on the neodymium iron boron thin sheet;
And a mass analysis module: if any index of the NdFeB sheet is detected to be unqualified, marking the NdFeB sheet as an unqualified product;
and a data acquisition module: when a plurality of indexes of the detected neodymium iron boron thin sheet are qualified, acquiring a plurality of process data in the production process of the neodymium iron boron thin sheet;
an index calculating module: according to the defect analysis model, outputting a defect index for the NdFeB sheet after analyzing a plurality of process data;
the set dividing module: dividing the neodymium-iron-boron sheet into a non-flaw set, a slight flaw set or a serious flaw set after analyzing flaw indexes of the neodymium-iron-boron sheet;
The warning control module: if two or more neodymium iron boron sheets are continuously detected to be unqualified or more than two neodymium iron boron sheets are continuously detected to be in a serious flaw set, automatically controlling a production line to stop running, and sending a warning signal to an administrator;
Decision generation module: if more than two neodymium iron boron sheets exist in the slight flaw set, acquiring whether an order requiring the slight flaw set exists in the current order through an order management system, generating a management decision according to the acquired result, and sending the management decision to an administrator.
In the technical scheme, the invention has the technical effects and advantages that:
1. According to the invention, a plurality of process data in the production process of the neodymium iron boron thin sheet are obtained, a flaw index is output for the neodymium iron boron thin sheet after the plurality of process data are analyzed according to the flaw analysis model, the neodymium iron boron thin sheet is divided into a non-flaw set, a slight flaw set or a serious flaw set after the flaw index of the neodymium iron boron thin sheet is analyzed, if more than two neodymium iron boron thin sheets exist in the serious flaw set, a detection system automatically controls a production line to stop running and sends a warning signal to an administrator, if more than two neodymium iron boron thin sheets exist in the slight flaw set, the detection system obtains whether an order requiring the use of the slight flaw set exists in a current order through an order management system, and generates a management decision according to an obtained result. The detection system can effectively detect the hysteresis flaws of the neodymium-iron-boron sheet, and automatically and correspondingly manage the neodymium-iron-boron sheet according to the detection results of the hysteresis flaws, so that the subsequent stable use of the neodymium-iron-boron sheet is effectively ensured;
2. according to the invention, after the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient are obtained, the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient are substituted into the flaw analysis model for comprehensive analysis, the flaw analysis model carries out standardized treatment on the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient, and then the flaw index is obtained through calculation according to the fact that the magnetic field fluctuation amplitude and the flaw index are in inverse proportion relation, the temperature deviation value and the atmosphere abnormality coefficient are in direct proportion relation, so that whether hysteresis flaws exist in the neodymium-iron-boron sheet is analyzed more comprehensively, and the analysis is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a block diagram of a system according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: referring to fig. 1, the method for detecting the automatic performance of the neodymium iron boron thin sheet according to the embodiment includes the following steps:
after the neodymium iron boron sheet is produced, the detection system carries out multiple index detection on the neodymium iron boron sheet, and the detection system comprises the following steps:
Preparation: and preparing a neodymium iron boron sheet sample to be detected, ensuring the sample identification to be clear, and preparing equipment and reagents required by detection.
Appearance inspection: the detection system performs appearance inspection through the camera, and detects whether the surface of the neodymium iron boron sheet is smooth, has no cracks, has no obvious color change or stains and other defects.
Size measurement: and the dimensional parameters of the NdFeB thin sheet, such as length, width, thickness and the like, are measured through an automatic caliper, so that the standard requirements are met.
Magnetic performance test: the magnetic performance of the NdFeB thin sheet is tested by magnetic testing equipment (such as a Hall effect measuring instrument, an oscillation magnetometer and the like).
Chemical component analysis: and a chemical analysis method (using an X-ray fluorescence spectrometer, an atomic absorption spectrometer and the like) is adopted to analyze the chemical components of the neodymium iron boron thin sheet, so that the standard requirements are met.
And (3) microstructure observation: and observing the microstructure of the neodymium iron boron sheet, including the conditions of crystal grain morphology, crystal boundary definition and the like through scanning electron microscope equipment.
And (3) detecting the heat treatment effect: and detecting after the heat treatment is carried out on the NdFeB sheet, and analyzing the influence of the heat treatment on the performance of the NdFeB sheet.
Data recording and analysis: recording the detection result in a detection table or report, carrying out data analysis, evaluating the quality condition of the NdFeB sheet, and formulating a subsequent treatment scheme according to the quality condition.
If any index of the neodymium iron boron sheet is unqualified, marking the neodymium iron boron sheet as an unqualified product, and if two or more than two neodymium iron boron sheets are unqualified in continuous detection, stopping the operation of a production line by a detection system automatic control, and sending an alarm signal to an administrator, wherein the method comprises the following steps:
Detecting the unqualified mark: after the failure index of the NdFeB flakes is detected, the system should automatically mark the flakes as a failed product for subsequent processing.
Stopping the production line operation: when two or more than two neodymium iron boron thin sheets are continuously detected to be unqualified, the detection system should automatically control the production line to stop running. This ensures that the reject product does not continue to the production flow of the next stage to prevent mass production of the reject product.
Sending an alarm signal: the system should send an alert signal to the administrator informing it that there are consecutive defective products. This may be notified by way of e-mail, text message, cell phone application notification, or alarm on the production monitoring system.
Record data and cause analysis: the system should record relevant data of the unqualified products, including information of unqualified indexes, production batches, production time and the like, so as to facilitate subsequent analysis of reasons and quality improvement work.
Manual intervention and treatment: after receiving the warning signal, the manager should intervene immediately and process the unqualified products. Possible treatments include stopping the production line, troubleshooting problems, adjusting equipment parameters, changing materials or processes, cleaning equipment, etc.
Restarting the production line: after confirming that the problem is solved, an administrator can restart the production line to continue producing the NdFeB sheet meeting the quality requirement.
When a plurality of indexes of the neodymium iron boron thin sheet are detected to be qualified, the detection system acquires a plurality of process data in the production process of the neodymium iron boron thin sheet, the defect index is output for the neodymium iron boron thin sheet after analyzing the plurality of process data according to the defect analysis model, the neodymium iron boron thin sheet is divided into a non-defect set, a slight defect set or a serious defect set after analyzing the defect index of the neodymium iron boron thin sheet, if more than two neodymium iron boron thin sheets exist in the serious defect set, the detection system automatically controls a production line to stop running and sends a warning signal to an administrator, if more than two neodymium iron boron thin sheets exist in the slight defect set, the detection system acquires whether an order requiring the use of the slight defect set exists in a current order through the order management system, generates a management decision according to the acquired result, and sends the management decision to the administrator.
According to the application, a plurality of process data in the production process of the neodymium iron boron thin sheet are obtained, a flaw index is output for the neodymium iron boron thin sheet after the plurality of process data are analyzed according to the flaw analysis model, the neodymium iron boron thin sheet is divided into a non-flaw set, a slight flaw set or a serious flaw set after the flaw index of the neodymium iron boron thin sheet is analyzed, if more than two neodymium iron boron thin sheets exist in the serious flaw set, a detection system automatically controls a production line to stop running and sends a warning signal to an administrator, if more than two neodymium iron boron thin sheets exist in the slight flaw set, the detection system obtains whether an order requiring the use of the slight flaw set exists in a current order through an order management system, and generates a management decision according to an obtained result. The detection system can effectively detect the hysteresis flaws of the neodymium iron boron sheet, and automatically carries out corresponding management according to the detection results of the hysteresis flaws, so that the follow-up stable use of the neodymium iron boron sheet is effectively ensured.
Practical applications of the neodymium iron boron sheet include the following two cases:
Application of neodymium iron boron flakes in flawless collection:
1) Precision motors or power tools: electromagnetic components for manufacturing precision motors or power tools. These devices have high requirements for magnetic properties, requiring stable magnetic properties and excellent magnetic energy.
2) Magnetic sensor and magnetic recording apparatus: the method is used for manufacturing magnetic sensors, magnetic recording devices and other devices with high requirements on magnetic field sensitivity.
3) Medical instrument: in some high-end medical devices, such as nuclear magnetic resonance devices, neodymium iron boron flakes are used as magnetic elements for nuclear magnetic resonance imaging.
4) Aerospace device: in some aerospace devices, such as control systems for aircraft, neodymium-iron-boron foils are used to ensure high performance and reliability of the device.
Application of NdFeB flakes in a light defect set:
1) Household appliance: for manufacturing household appliances such as fans, cleaners, etc., these devices have relatively low requirements for magnetic properties.
2) Magnetic toy: for the manufacture of magnetic toys, these products are generally not particularly critical to magnetic performance, and focus on entertainment and appearance.
3) Automobile parts: in the automotive industry, the requirements for magnetic properties are relatively low for manufacturing some automotive parts, such as electric windows, electric seats, etc.
4) General industrial use: for some general industrial applications, such as magnetic closures, electromagnetic chucks, etc., these applications have low requirements for magnetic properties, mainly focusing on functionality and cost effectiveness.
5) After the enterprise produces the flawless neodymium iron boron sheet and the slightly flawed neodymium iron boron sheet, the slightly flawed neodymium iron boron sheet can be subjected to management such as price reduction and sale.
Example 2: when a plurality of indexes of the detected neodymium iron boron thin sheet are qualified, the detection system acquires a plurality of process data in the production process of the neodymium iron boron thin sheet, and the detection system comprises the following steps:
The detection system acquires a plurality of process data in the production process of the NdFeB sheet, wherein the plurality of process data comprise a magnetic field fluctuation amplitude value, a temperature deviation value and an atmosphere anomaly coefficient;
The acquisition logic of the magnetic field fluctuation amplitude is as follows:
in the pressing process of the neodymium iron boron sheet, real-time current of the electromagnetic coil is obtained in real time through a current sensor, the real-time current is compared with a preset current stability range, if the real-time current of the electromagnetic coil is in the current stability range, the operation stability of the electromagnetic coil is indicated, and the time period of the real-time current of the electromagnetic coil in the current stability range is marked as an electromagnetic coil current stability time period;
In the pressing process of the neodymium iron boron sheet, acquiring real-time pressing speed in the pressing process through an encoder of a pressing machine, comparing the acquired real-time pressing speed in the pressing process with a preset speed range, and marking a time period in which the pressing speed is not in the speed range as a pressing speed early warning time period if the real-time pressing speed is not in the speed range, which indicates that the pressing speed is too high or too low, the density and the structure of the neodymium iron boron sheet can be caused, and further the distribution and the strength of a magnetic field are influenced;
the electromagnetic coil current stabilization period and the suppression speed early warning period are subjected to integral operation to obtain a magnetic field fluctuation amplitude, and the function expression is as follows:
，
In the method, in the process of the invention, For the magnitude of the magnetic field fluctuation,Is the real-time variation of the coercive force,For the period of time of current stabilization of the solenoid,The early warning period of the pressing speed is provided.
The larger the fluctuation amplitude of the magnetic field is, the larger the fluctuation of the coercive force of the NdFeB sheet is caused by the influence of current and pressing speed in the pressing process;
The coercivity is an index for measuring the capability of the magnetic material to resist the change of the magnetization direction, has an important influence on the magnetic performance of the neodymium-iron-boron sheet, and can have adverse effects on the performance of the neodymium-iron-boron sheet when the coercivity is too large or too small, and is specifically as follows:
1) The coercivity is too great:
Difficulty in magnetization: the high coercivity may lead to a difficult magnetization process requiring a larger magnetic field to magnetize the NdFeB flakes. This may reduce the sensitivity and operability of the sheet in practical applications.
The energy loss increases: excessive coercivity can result in more energy being consumed during magnetization and demagnetization, increasing energy loss.
Adverse to magnetic recording: for applications requiring high magnetic sensitivity (e.g., magnetic recording, etc.), excessive coercivity can reduce the performance of the flakes, making them unsuitable for use in these applications.
2) The coercivity is too small:
stability is poor: too small coercivity may cause the neodymium-iron-boron sheet to be easily magnetized under the action of an external magnetic field, and stability of the neodymium-iron-boron sheet is reduced.
Is easy to be interfered by the outside: the coercivity is too small so that the NdFeB thin sheet is more easily interfered by an external magnetic field, and therefore stability and reliability of magnetic performance of the NdFeB thin sheet are affected.
Application restrictions: for certain application scenarios requiring high coercivity, such as magnetic memories, sensors, etc., too small coercivity may result in a neodymium-iron-boron sheet that is not satisfactory.
Because the influence on the neodymium-iron-boron thin sheet is small or even no when the electromagnetic coil current fluctuates for a short time (for example, within 2-5 seconds), and the influence on the neodymium-iron-boron thin sheet is small or even no influence when the pressing speed deviates from the speed range for a short time, the electromagnetic coil current stabilization period and the pressing speed early warning period are integrated to obtain the magnetic field fluctuation amplitude, so that the electromagnetic coil current and the pressing speed are monitored in real time in the whole pressing process, and when the electromagnetic coil current fluctuation or the pressing speed deviates intermittently, even if the quality of the neodymium-iron-boron thin sheet is not directly influenced, hysteresis defects exist on the neodymium-iron-boron thin sheet, for example, the problems of different sizes of partial magnetic domains, tiny displacement of the positions of magnetic domain walls and the like can be caused, and the problems cannot be monitored through a detection system, but the follow-up magnetic performance of the neodymium-iron-boron thin sheet can be reduced.
The acquisition logic of the temperature deviation value is as follows: in the sintering process of the neodymium iron boron sheet, acquiring the real-time temperature inside the sintering equipment through a temperature sensor, and calculating a temperature deviation value according to the real-time temperature and a temperature stability range, wherein the function expression is as follows:
，
In the method, in the process of the invention, As the value of the deviation of the temperature,In order to achieve a temperature stability range,For real-time temperature, the larger the temperature deviation value is, the higher or lower the temperature inside the sintering equipment is, and the following effects are easily brought to the NdFeB sheet:
1) The grain growth is uneven: too high or too low a temperature deviation may lead to non-uniform grain growth during sintering. Too high a temperature deviation value may promote growth of crystal grains, but if the temperature is too high, the growth rate of crystal grains may be uneven, resulting in non-uniformity of crystal grain size. Conversely, too low a temperature deviation value may cause insufficient growth rate of the crystal grains and also cause non-uniformity in the crystal grain size.
2) Grain boundary sharpness decreases: too large a temperature deviation value may cause a decrease in the sharpness of grain boundaries. Too high a temperature deviation value may cause the growth rate of grains to be too fast, so that the definition of grain boundaries is reduced, and the grain boundaries become blurred, thereby affecting the magnetic properties of the neodymium-iron-boron thin sheet. Too low a temperature deviation value may also cause a decrease in the sharpness of grain boundaries, because insufficient temperature may cause grain growth at the grain boundaries to be limited, thereby making the grain boundaries unclear.
3) The grain distribution is not uniform: too high or too low a temperature deviation value may cause uneven distribution of grains. This may be due to the temperature deviation affecting the grain growth rate, so that some regions grow too fast and other regions grow at a slower rate, resulting in uneven grain distribution.
When the real-time temperature deviates from the temperature stability range, but deviates from the temperature stability range for hours (for example, deviates from 0.5 ℃), the quality of the NdFeB sheet cannot be affected, but hysteresis defects, such as rapid growth of small parts of grains, slow growth rate of small parts of grains, more temperature deviations, severe hysteresis defects and even quality influence, can still occur on the NdFeB sheet.
The acquisition logic of the atmosphere anomaly coefficient is as follows: measuring the real-time atmosphere speed inside the primary sintering equipment through a flow rate sensor at intervals, establishing a sample set of the atmosphere speed obtained at a plurality of measurement time points, calculating the atmosphere average speed and the atmosphere speed standard deviation in the sample set, and obtaining an atmosphere anomaly coefficient by comparing the atmosphere speed standard deviation with the atmosphere average speed, wherein the function expression is as follows:
，
In the method, in the process of the invention, ，Representing the number of measurement time points in the sample set,Represents the atmospheric velocity at the i-th measurement time point,The average velocity of the atmosphere is indicated,Is the standard deviation of the speed of the atmosphere,For the atmosphere anomaly coefficient, the larger the atmosphere anomaly coefficient is, which indicates that the atmosphere speed fluctuation of the sintering equipment is large in the measurement time period, and the following effects are brought to the NdFeB sheet:
1) The sintering quality is unstable: the fluctuation of the atmosphere speed can lead to uneven distribution of the atmosphere in the sintering process, thereby affecting the sintering quality of the neodymium iron boron thin sheet. If the fluctuation of the atmosphere speed is large and the duration is long, non-uniformity of the sintering temperature and instability of heat transfer may be caused, thereby affecting the density, crystalline structure and magnetic properties of the sheet.
2) Magnetic properties are inconsistent: fluctuations in the speed of the atmosphere during sintering may affect the alignment and sintering behavior of the magnetic particles in the neodymium-iron-boron flakes, resulting in non-uniformity of the magnetic domain structure. This may lead to non-uniformity in the magnetic properties of the flakes, such that the magnetic properties of the different portions differ significantly.
3) Atmosphere composition variation: the fluctuation of the atmosphere speed may affect the mixing and stability of the atmosphere, resulting in a change of the atmosphere composition. This may lead to an increase in harmful components in the atmosphere or a change in the redox environment, which in turn affects the sintering process and performance of the neodymium iron boron flakes.
4) The surface quality is uneven: the fluctuation of the atmosphere speed may cause uneven temperature and pressure distribution on the surface of the sheet during sintering, thereby affecting the quality and flatness of the surface of the sheet. Uneven surface quality may affect the magnetic properties, mechanical properties and appearance quality of the flakes.
And outputting flaw indexes for the NdFeB sheet after analyzing a plurality of process data according to a flaw analysis model, wherein the method comprises the following steps of:
After the detection system obtains the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient, substituting the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient into the flaw analysis model for comprehensive analysis, and after the flaw analysis model performs standardized processing on the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient, calculating and obtaining the flaw index according to the fact that the magnetic field fluctuation amplitude and the flaw index are in inverse proportion relation, and the temperature deviation value and the atmosphere abnormality coefficient are in direct proportion relation, wherein the function expression of the flaw analysis model is as follows:
，
In the method, in the process of the invention, As an index of the flaws, the method is that,Indicating the overall temperature deviation value of the sintering equipment,Indicating the number of temperature monitoring points,Represent the firstThe temperature deviation values of the temperature monitoring points,The coefficient of the atmosphere abnormality is represented,Representing the magnitude of the magnetic field fluctuations,、、The ratio coefficients of the fluctuation amplitude of the magnetic field, the integral temperature deviation value of the sintering equipment and the atmosphere abnormality coefficient are respectively that、、Are all greater than 0.
According to the application, after the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient are obtained, the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient are substituted into the flaw analysis model for comprehensive analysis, the flaw analysis model carries out standardized treatment on the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient, and then the flaw index is obtained through calculation according to the fact that the magnetic field fluctuation amplitude and the flaw index are in inverse proportion relation, the temperature deviation value and the atmosphere abnormality coefficient are in direct proportion relation, so that whether hysteresis flaws exist in the neodymium-iron-boron sheet is analyzed more comprehensively, and the analysis is more accurate.
After analyzing the flaw index of the neodymium iron boron sheet, the neodymium iron boron sheet is marked into a non-flaw set, a slight flaw set or a serious flaw set, and the method comprises the following steps of:
as can be seen from the functional expression of the flaw analysis model, the larger the flaw index is, the more likely the NdFeB sheet has hysteresis flaws, and the more serious the hysteresis flaws are;
Therefore, after the flaw index is obtained, the flaw index is compared with a preset flaw gradient threshold, the flaw gradient threshold comprises a first flaw threshold and a second flaw threshold, the first flaw threshold is smaller than the second flaw threshold, the first flaw threshold is used for judging whether hysteresis flaws exist in the neodymium-iron-boron sheet, and the second flaw threshold is used for judging the severity of the hysteresis flaws of the neodymium-iron-boron sheet;
if the flaw index of the NdFeB sheet is smaller than or equal to the first flaw threshold value, judging that the NdFeB sheet has no hysteresis flaw, and scribing the NdFeB sheet into a flaw-free set;
If the flaw index of the NdFeB sheet is larger than the first flaw threshold and smaller than or equal to the second flaw threshold, judging that the NdFeB sheet has a hysteresis flaw, but the hysteresis flaw is slight, and scribing the NdFeB sheet into a slight flaw set;
If the flaw index of the NdFeB sheet is larger than the second flaw threshold value, judging that the NdFeB sheet has hysteresis flaws and the hysteresis flaws are serious, and scribing the NdFeB sheet into a serious flaw set.
If more than two neodymium iron boron sheets exist in the slight flaw set, the detection system acquires whether an order requiring the slight flaw set exists in the current order through the order management system, generates a management decision according to the acquired result, and sends the management decision to an administrator, wherein the detection system comprises the following steps:
The method comprises the steps of monitoring the number of neodymium iron boron sheets in a slight flaw set in real time, if more than two neodymium iron boron sheets exist in the slight flaw set, acquiring whether an order requiring the use of the slight flaw set exists in a current order through an order management system by a detection system, and if the order requiring the use of the slight flaw set does not exist, controlling a production line to stop and sending a warning signal to an administrator by the order detection system requiring the use of the slight flaw set;
if an order requiring a slight flaw set exists, marking the order as a secondary order, acquiring the number of the slight flaw NdFeB sheets required by all the secondary orders by a detection system, and when the number of the NdFeB sheets in the slight flaw set is smaller than or equal to the number of the slight flaw NdFeB sheets required by all the secondary orders in the NdFeB sheet production process, not managing by the detection system; when the number of the neodymium iron boron thin sheets in the slight defect set is larger than that of the neodymium iron boron thin sheets required by all secondary orders, the detection system controls the production line to stop and sends a warning signal to an administrator.
Specifically, when the detection system controls the production line to stop and sends a warning signal to an administrator, the administrator is required to maintain or overhaul the production line in time so as to ensure the stable production of the NdFeB sheet.
Application of NdFeB flakes in a light defect set:
1) Household appliance: for manufacturing household appliances such as fans, cleaners, etc., these devices have relatively low requirements for magnetic properties.
2) Magnetic toy: for the manufacture of magnetic toys, these products are generally not particularly critical to magnetic performance, and focus on entertainment and appearance.
3) Automobile parts: in the automotive industry, the requirements for magnetic properties are relatively low for manufacturing some automotive parts, such as electric windows, electric seats, etc.
4) General industrial use: for some general industrial applications, such as magnetic closures, electromagnetic chucks, etc., these applications have low requirements for magnetic properties, mainly focusing on functionality and cost effectiveness.
5) After the enterprise produces the flawless neodymium iron boron sheet and the slightly flawed neodymium iron boron sheet, the slightly flawed neodymium iron boron sheet can be subjected to management such as price reduction and sale.
Example 3: referring to fig. 2, the automatic performance detection system for neodymium iron boron thin sheets in this embodiment includes a detection module, a quality analysis module, a data acquisition module, an index calculation module, a set division module, a warning control module, and a decision generation module;
And a detection module: after the neodymium iron boron thin sheet is produced, performing multiple index detection on the neodymium iron boron thin sheet, and sending detection results to a quality analysis module and a data acquisition module;
And a mass analysis module: if any index detection of the NdFeB sheet is unqualified, marking the NdFeB sheet as an unqualified product, and sending the marking quantity of the unqualified product to a warning control module;
And a data acquisition module: when a plurality of indexes of the detected neodymium iron boron thin sheet are qualified, a plurality of process data in the production process of the neodymium iron boron thin sheet are obtained, and the plurality of process data are sent to an index calculation module;
An index calculating module: according to the defect analysis model, a plurality of process data are analyzed, then a defect index is output for the neodymium iron boron sheet, and the defect index is sent to the set dividing module;
The set dividing module: dividing the neodymium iron boron sheet into a non-flaw set, a slight flaw set or a serious flaw set after analyzing flaw indexes of the neodymium iron boron sheet, and sending a set dividing result to a warning control module and a decision generation module;
The warning control module: if two or more neodymium iron boron sheets are continuously detected to be unqualified or more than two neodymium iron boron sheets are continuously detected to be in a serious flaw set, automatically controlling a production line to stop running, and sending a warning signal to an administrator;
Decision generation module: if more than two neodymium iron boron sheets exist in the slight flaw set, acquiring whether an order requiring the slight flaw set exists in the current order through an order management system, generating a management decision according to the acquired result, and sending the management decision to an administrator.
The above formulas are all formulas with dimensions removed and numerical values calculated, the formulas are formulas with a large amount of data collected for software simulation to obtain the latest real situation, and preset parameters in the formulas are set by those skilled in the art according to the actual situation.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. The automatic performance detection method for the neodymium iron boron thin sheet is characterized by comprising the following steps of: the detection method comprises the following steps:
after the production of the neodymium iron boron thin sheet, the detection system carries out multiple index detection on the neodymium iron boron thin sheet, if any index detection of the neodymium iron boron thin sheet is failed, the neodymium iron boron thin sheet is marked as a failed product, if more than two neodymium iron boron thin sheets are continuously detected to be failed, the detection system automatically controls the production line to stop running, and sends a warning signal to an administrator;
When a plurality of indexes of the neodymium iron boron sheet are detected to be qualified, the detection system acquires a plurality of process data in the production process of the neodymium iron boron sheet, outputs a flaw index for the neodymium iron boron sheet after analyzing the plurality of process data according to a flaw analysis model, and divides the neodymium iron boron sheet into a flaw-free set, a slight flaw set or a serious flaw set after analyzing the flaw index of the neodymium iron boron sheet;
if more than two neodymium iron boron sheets exist in the serious flaw set, the detection system automatically controls the production line to stop running and sends a warning signal to an administrator;
if more than two neodymium iron boron sheets exist in the slight flaw set, the detection system acquires whether an order requiring the slight flaw set exists in the current order through the order management system, generates a management decision according to the acquired result, and sends the management decision to an administrator;
the detection system acquires a plurality of process data in the production process of the NdFeB sheet, wherein the plurality of process data comprise a magnetic field fluctuation amplitude value, a temperature deviation value and an atmosphere anomaly coefficient;
The acquisition logic of the magnetic field fluctuation amplitude is as follows:
in the pressing process of the neodymium iron boron sheet, acquiring real-time current of the electromagnetic coil in real time through a current sensor, comparing the real-time current with a preset current stability range, and marking a time period of the real-time current of the electromagnetic coil in the current stability range as an electromagnetic coil current stability time period;
Acquiring real-time pressing speed in the pressing process through an encoder of the pressing machine, comparing the acquired real-time pressing speed in the pressing process with a preset speed range, and marking a period of which the pressing speed is not in the speed range as a pressing speed early warning period;
The electromagnetic coil current stabilization period and the suppression speed early warning period are subjected to integral operation to obtain a magnetic field fluctuation amplitude;
And outputting flaw indexes for the NdFeB sheet after analyzing a plurality of process data according to a flaw analysis model, wherein the method comprises the following steps of:
After the detection system obtains the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient, substituting the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient into the flaw analysis model for comprehensive analysis, and after the flaw analysis model performs standardized processing on the magnetic field fluctuation amplitude, the temperature deviation value and the atmosphere abnormality coefficient, calculating and obtaining the flaw index according to the fact that the magnetic field fluctuation amplitude and the flaw index are in inverse proportion relation, and the temperature deviation value, the atmosphere abnormality coefficient and the flaw index are in direct proportion relation, wherein the function expression is: In the above, the ratio of/> Is flaw index,/>Indicating the overall temperature deviation value of sintering equipment,/>Representing the number of temperature monitoring points,/>Represents the/>Temperature deviation value of each temperature monitoring point/>Representing the atmosphere abnormality coefficient,/>Representing the amplitude of the magnetic field fluctuation,/>The ratio coefficients of the fluctuation amplitude of the magnetic field, the integral temperature deviation value of the sintering equipment and the atmosphere anomaly coefficient are respectively shown as/>Are all greater than 0;
The acquisition logic of the atmosphere anomaly coefficient is as follows: measuring the real-time atmosphere speed inside the primary sintering equipment through a flow rate sensor at intervals, establishing a sample set of the atmosphere speed obtained at a plurality of measurement time points, calculating the atmosphere average speed and the atmosphere speed standard deviation in the sample set, and obtaining an atmosphere anomaly coefficient by comparing the atmosphere speed standard deviation with the atmosphere average speed, wherein the function expression is as follows: In the above, the ratio of/> Representing the number of measurement time points in a sample set,/>Represents the/>Atmosphere speed at each measurement time point,/>Represents the average velocity of the atmosphere,/>Is the standard deviation of the atmosphere speed,/>Is the atmosphere abnormality coefficient;
The logic for acquiring the temperature deviation value is as follows: in the sintering process of the neodymium iron boron sheet, acquiring the real-time temperature inside the sintering equipment through a temperature sensor, and calculating a temperature deviation value according to the real-time temperature and a temperature stability range, wherein the function expression is as follows: In the above, the ratio of/> Is the temperature deviation value,/>For the temperature stability range,/>Is a real-time temperature.
2. The method for automatically detecting the performance of the neodymium iron boron thin sheet according to claim 1, wherein the method comprises the following steps: after analyzing the flaw index of the neodymium iron boron sheet, the neodymium iron boron sheet is marked into a non-flaw set, a slight flaw set or a serious flaw set, and the method comprises the following steps of:
After obtaining the flaw index, comparing the flaw index with a preset flaw gradient threshold, wherein the flaw gradient threshold comprises a first flaw threshold and a second flaw threshold, the first flaw threshold is smaller than the second flaw threshold, the first flaw threshold is used for judging whether hysteresis flaws exist in the neodymium-iron-boron sheet, and the second flaw threshold is used for judging the severity of the hysteresis flaws of the neodymium-iron-boron sheet;
if the flaw index of the NdFeB sheet is smaller than or equal to the first flaw threshold value, judging that the NdFeB sheet has no hysteresis flaw, and scribing the NdFeB sheet into a flaw-free set;
If the flaw index of the NdFeB sheet is larger than the first flaw threshold and smaller than or equal to the second flaw threshold, judging that the NdFeB sheet has a hysteresis flaw, but the hysteresis flaw is slight, and scribing the NdFeB sheet into a slight flaw set;
If the flaw index of the NdFeB sheet is larger than the second flaw threshold value, judging that the NdFeB sheet has hysteresis flaws and the hysteresis flaws are serious, and scribing the NdFeB sheet into a serious flaw set.
3. The method for automatically detecting the performance of the neodymium iron boron thin sheet according to claim 2, wherein the method comprises the following steps: if more than two neodymium iron boron sheets exist in the slight flaw set, the detection system acquires whether an order requiring the slight flaw set exists in the current order through the order management system, generates a management decision according to the acquired result, and sends the management decision to an administrator, wherein the detection system comprises the following steps:
The method comprises the steps of monitoring the number of neodymium iron boron sheets in a slight flaw set in real time, if more than two neodymium iron boron sheets exist in the slight flaw set, acquiring whether an order requiring the use of the slight flaw set exists in a current order through an order management system by a detection system, and if the order requiring the use of the slight flaw set does not exist, controlling a production line to stop and sending a warning signal to an administrator by the order detection system requiring the use of the slight flaw set;
if an order requiring a slight flaw set exists, marking the order as a secondary order, acquiring the number of the slight flaw NdFeB sheets required by all the secondary orders by a detection system, and when the number of the NdFeB sheets in the slight flaw set is smaller than or equal to the number of the slight flaw NdFeB sheets required by all the secondary orders in the NdFeB sheet production process, not managing by the detection system; when the number of the neodymium iron boron thin sheets in the slight defect set is larger than that of the neodymium iron boron thin sheets required by all secondary orders, the detection system controls the production line to stop and sends a warning signal to an administrator.
4. The method for automatically detecting the performance of the neodymium iron boron thin sheet according to claim 3, wherein the method comprises the following steps: if more than two neodymium iron boron thin sheets are continuously detected to be unqualified, the detection system automatically controls the production line to stop running and sends an alarm signal to an administrator, and the method comprises the following steps:
after the unqualified indexes of the neodymium iron boron thin sheets are detected, the detection system automatically marks the neodymium iron boron thin sheets as unqualified products, and when more than two neodymium iron boron thin sheets are continuously detected to be unqualified, the detection system automatically controls the production line to stop running and sends a warning signal to an administrator to inform that continuous unqualified products exist;
Recording related data of the unqualified products, wherein the related data comprise unqualified indexes, production batches and production time information, and restarting the production line to continue producing the NdFeB sheet after the confirmation problem is solved.
5. An automatic performance detection system for a neodymium iron boron sheet, which is used for realizing the detection method according to any one of claims 1 to 4, and is characterized in that: the system comprises a detection module, a quality analysis module, a data acquisition module, an index calculation module, a set dividing module, a warning control module and a decision generation module;
and a detection module: after the production of the neodymium iron boron thin sheet, carrying out multiple index detection on the neodymium iron boron thin sheet;
And a mass analysis module: if any index of the NdFeB sheet is detected to be unqualified, marking the NdFeB sheet as an unqualified product;
and a data acquisition module: when a plurality of indexes of the detected neodymium iron boron thin sheet are qualified, acquiring a plurality of process data in the production process of the neodymium iron boron thin sheet;
an index calculating module: according to the defect analysis model, outputting a defect index for the NdFeB sheet after analyzing a plurality of process data;
the set dividing module: dividing the neodymium-iron-boron sheet into a non-flaw set, a slight flaw set or a serious flaw set after analyzing flaw indexes of the neodymium-iron-boron sheet;
the warning control module: if more than two neodymium iron boron thin sheets are continuously detected to be unqualified or more than two neodymium iron boron thin sheets are continuously detected to be in a serious flaw set, the production line is automatically controlled to stop running, and an alarm signal is sent to an administrator;
Decision generation module: if more than two neodymium iron boron sheets exist in the slight flaw set, acquiring whether an order requiring the slight flaw set exists in the current order through an order management system, generating a management decision according to the acquired result, and sending the management decision to an administrator.
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