CN111015370B - Grinding monitoring method based on thermal coupling - Google Patents
Grinding monitoring method based on thermal coupling Download PDFInfo
- Publication number
- CN111015370B CN111015370B CN201911093209.6A CN201911093209A CN111015370B CN 111015370 B CN111015370 B CN 111015370B CN 201911093209 A CN201911093209 A CN 201911093209A CN 111015370 B CN111015370 B CN 111015370B
- Authority
- CN
- China
- Prior art keywords
- grinding
- force
- temperature
- fluctuation
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The invention discloses a grinding monitoring method based on thermal coupling, which is applied to a grinding machine tool and comprises the following steps: setting a threshold, collecting grinding part information, acquiring grinding part data, analyzing, judging and analyzing the vibration condition; compared with the prior art, the grinding state and the vibration condition of the grinding part during grinding are identified by comprehensively analyzing the grinding temperature signals concentrated by the temperature signals of the grinding part, the grinding force signals concentrated by the force signals and the force vibration information, so that an operator is reminded to perform corresponding operation according to reminding, the grinding state of the grinding part is monitored in real time and adjusted in time, the grinding part is in a stable state during grinding, and the grinding quality of the grinding part is guaranteed.
Description
Technical Field
The invention relates to the field of grinding monitoring, in particular to a coupling-based grinding monitoring method.
Background
Grinding is one of the important technologies for improving the surface quality of a grinding part, a grinding wheel is required to be used for grinding and ultraprecision machining of many precision parts, and the abrasion passivation degree of the grinding wheel has important influence on the surface quality of the grinding part.
In the grinding process, the grinding temperature and the grinding force are different under different grinding parameters, the grinding wheel and a grinding part can be damaged by larger grinding temperature and grinding force, the surface quality of the grinding part can be influenced by larger fluctuation of the grinding temperature and the grinding force, moreover, along with the increase of the grinding time, the grinding dull grinding and falling phenomena can occur to the abrasive particles of the grinding wheel, the grinding temperature and the grinding force can also change accordingly, the size precision and the surface quality of the processed grinding part can be seriously influenced, if the grinding wheel is not repaired or replaced in time, the product rejection rate can be improved, therefore, the state of the surface of the grinding wheel can be known in real time, the grinding parameters can be adjusted in time, and the grinding wheel is replaced or repaired.
Disclosure of Invention
The invention aims to provide a grinding monitoring method based on thermal coupling, which can monitor the grinding state of a grinding part in real time and adjust the grinding state in time.
In order to achieve the above purpose, the solution of the invention is as follows:
a grinding monitoring method based on thermal coupling comprises the following steps:
a1, setting threshold: determining a grinding force threshold value of a grinding part generating grinding cracks, determining a temperature threshold value of the surface of the grinding part generating burn and determining a fluctuation threshold value of the grinding part generating vibration;
a2, acquiring grinding part information: collecting grinding temperature signals and grinding force signals at intervals in unit time in the grinding process of a grinding part, wherein the grinding temperature signals collected in unit time form a temperature signal set, and the grinding force signals collected in unit time form a force signal set;
a3, acquiring grinding part data: averaging the temperature signal set to obtain the temperature of a grinding contact area, averaging the force signal set to obtain the grinding force of a grinding part, and carrying out centralized processing on the force signal to obtain force vibration information, wherein the force vibration information comprises a plurality of fluctuation frequencies;
a4, analysis and judgment: comparing the temperature of the grinding contact area with the temperature threshold value, and comparing the grinding force of the grinding part with the grinding force threshold value;
when the temperature of the grinding contact area is smaller than the temperature threshold value and the grinding force of the grinding part is smaller than the grinding force threshold value, judging that the grinding part is in a stable grinding state, and then repeating the steps A2-A4;
when the temperature of the grinding contact area is larger than or equal to the temperature threshold value and/or the grinding force of the grinding part is larger than or equal to the grinding force threshold value, judging that the grinding part is in a wear state, and continuing to the next step;
a5, analyzing vibration condition: comparing the fluctuation frequency with the fluctuation threshold value, and judging that the grinding part does not vibrate when the fluctuation frequency is smaller than the fluctuation threshold value, and reminding an operator that the grinding part needs to be processed; and when the size of at least one fluctuation frequency is larger than or equal to the size of the fluctuation threshold value, judging that the grinding part vibrates, reminding an operator that the grinding machine needs to be adjusted, and repeating the steps A2-A5.
In the step A2, a temperature sampling device is adopted to collect grinding temperature signals, and the grinding temperature signals are converted into digital signals through a signal collector and transmitted to a PC;
and collecting a grinding force signal by adopting a pressure device, converting the grinding force signal into a digital signal by the signal collector, and transmitting the digital signal to the PC.
The signal collector comprises a power supply module, a differential amplifying circuit, a microprocessor, a communication module and a touch display screen, wherein the differential amplifying circuit, the microprocessor and the communication module are sequentially connected, the touch display screen is used for displaying a signal collecting state and selecting a working mode, the touch display screen is bidirectionally connected with the microprocessor, the microprocessor is connected with a PC through the communication module, the output end of the PC is electrically connected with the driving end of the grinding machine tool, and the power supply module is used for providing a working power supply for the differential amplifying circuit, the microprocessor, the communication module and the touch display screen.
In step a3, the specific manner of obtaining the grinding contact zone temperature by centrally averaging the temperature signals is as follows: and extracting all grinding temperature signals in one temperature signal set, averaging all the grinding temperature signals, and obtaining the temperature of the grinding contact area through the averaged value.
In step a3, the specific manner of obtaining the grinding force of the grinding part by centrally averaging the force signals is as follows: and extracting all grinding force signals in one force signal set, averaging all the grinding force signals, and identifying the grinding force of the grinding part according to the averaged value.
In step a3, the process of obtaining the force vibration information according to one force signal set is:
b1: extracting a signal: extracting all grinding force signals in one force signal set;
b2: acquiring data: first mining in unit timeThe collected grinding force signal is used as a starting point, and a first wave valley value F is obtained by a comparative difference method1And a first peak value F1', corresponding to time t1The first force fluctuation is then Δ F1＝F1’-F1(ii) a Then obtaining a second wave valley value F by a comparison difference value method2And a second wave crest value F2', corresponding to time t2The second force fluctuation is of magnitude Δ F2＝F2’-F2(ii) a By analogy, the nth trough value FnAnd nth wave crest value Fn', the nth force fluctuation size is DeltaFn＝Fn’-FnCorresponding to time tn；
B3: calculating the fluctuation frequency: using a formula
n is 1, 2, … …, and n is a positive integer, and the fluctuation frequency P is calculated.
The grinding machine is applied to a grinding machine tool, a grinding part is mounted on a workbench of the grinding machine tool, when the grinding part vibrates, the vibration reason of the grinding part is judged, and the judgment mode is as follows:
if the fluctuation frequency is equal to or in positive integral multiple with the rotating speed value of the motor on the grinding machine tool, judging that the main shaft sleeve of the grinding part is worn or the grinding part is damaged;
if the numerical value of the fluctuation frequency and the round-trip speed of the grinding part on the grinding machine tool is integral multiple, judging that the grinding part or the clamp on the grinding machine tool has a problem;
and if a plurality of fluctuation frequencies in unit time are distributed irregularly, judging that the abrasion degree of the grinding part is seriously deteriorated.
The force oscillation information further includes an amplitude and an average grinding force, and after the step B3, further includes the steps of:
b4: calculating the amplitude: by mean fluctuation of grinding force Δ FnEvaluating the amplitude H of the grinding force by using a formula
n is a positive integer, and the amplitude H is calculated;
b5: calculating average grinding force by obtaining the average value F of the force of N sampling points in unit timeNBy the formula
N is a positive integer and N>n, calculating average grinding force
The pressure device comprises a film pressure sensor, and the film pressure sensor is clamped between a workbench of the grinding machine tool and the grinding part; the temperature sampling device comprises a sampling block and a thermocouple sensor arranged on the sampling block, and the sampling block is arranged on the workbench; the sampling end of the film pressure sensor and the sampling end of the thermocouple sensor are both electrically connected with the input end of the differential amplification circuit.
The signal collector is provided with a plurality of channel signal receiving ports.
After the method is adopted, the invention has the following beneficial effects: the grinding temperature signals concentrated by the temperature signals of the grinding part, the grinding force signals concentrated by the force signals and the force vibration information are comprehensively analyzed, the grinding state and the vibration condition of the grinding part during grinding are identified, an operator is reminded, the operator performs corresponding operation according to reminding, the grinding state of the grinding part is monitored in real time and adjusted in time, the grinding part is in a stable state during grinding, and the grinding quality of the grinding part is guaranteed.
Drawings
FIG. 1 is a block flow diagram of a grinding monitoring method of the present invention;
FIG. 2 is a schematic diagram of force and vibration information acquisition according to the present invention;
FIG. 3 is a schematic diagram of the operation of the present invention;
fig. 4 is a schematic structural diagram of a signal collector in the present invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
A grinding monitoring method based on thermal coupling, as shown in fig. 1-4, comprising the steps of:
a1: setting a threshold value: determining a grinding force threshold value of the grinding part for generating grinding cracks, determining a temperature threshold value of the surface of the grinding part for generating burn, and determining a fluctuation threshold value of the grinding part for generating vibration:
a2: collecting grinding part information: collecting generated grinding temperature signals at intervals in unit time in a grinding process of a grinding part, wherein the grinding signals collected in unit time form a temperature signal set, then collecting generated grinding force signals at intervals in unit time, and the grinding force signals collected in unit time form a force signal set;
a3: acquiring grinding part data: obtaining grinding contact area temperature from temperature signal centralized processing, obtaining grinding part grinding force from force signal centralized processing, and obtaining force vibration information from the grinding force signal centralized processing, wherein the force vibration information comprises a plurality of fluctuation frequencies;
a4: and (3) analysis and judgment: comparing the temperature of the grinding contact area with a temperature threshold value and comparing the grinding force of the grinding part with a grinding force threshold value, judging the grinding state of the grinding part, judging that the grinding part is in a stable grinding state when the temperature of the grinding contact area is less than the temperature threshold value and the grinding force of the grinding part is less than the grinding force threshold value, and repeating the step A2-A4; if the temperature of the grinding contact area is larger than or equal to the temperature threshold value and/or the grinding force of the grinding part is larger than or equal to the grinding force threshold value, judging that the grinding part is in a wear state, and continuing to the next step:
a5: analyzing the vibration condition: comparing the fluctuation frequency with the fluctuation threshold, and judging that the grinding part does not vibrate when the fluctuation frequency is smaller than the fluctuation threshold, and reminding an operator that the grinding part needs to be processed; and when the magnitude of at least one fluctuation frequency is larger than or equal to the magnitude of the fluctuation threshold value, judging that the grinding part vibrates, reminding an operator that the grinding machine needs to be adjusted, and then repeating the steps A2-A5.
In the invention, the grinding monitoring method is suitable for a conventional grinding machine tool, which can be a grinding machine tool, a belt grinding machine tool or a grinding machine. Wherein, a grinding part is placed on a workbench of the grinding machine tool.
In the present embodiment, the grinding member is exemplified as a grinding wheel, and the grinding member may be a conventional grinding member such as a grinding disc and an abrasive belt.
In step a1, the temperature threshold, the grinding force threshold, and the fluctuation threshold are all set manually and stored in the PC. Determining a grinding force threshold value by analyzing a grinding mechanism of a grinding part and a relation between grinding cracks generated on the grinding part and the grinding force; determining a temperature threshold value through the relation between the surface generated burn and the temperature; in other words, both the temperature threshold and the grinding force threshold can be obtained experimentally. In addition, the fluctuation threshold value can also be obtained through a large number of experiments.
In step a2, a temperature sampling device is used to collect a grinding temperature signal, which is converted into a digital signal by a signal collector and then transmitted to a PC. The grinding temperature signal set is a set of grinding temperature signals collected in unit time.
In step a2, a grinding force signal is collected by a pressure device, and the grinding force signal is converted into a digital signal by the aforementioned signal collector and then transmitted to a PC. Wherein, the force signal set is a set of grinding force signals collected in unit time.
The signal collector comprises a power supply module, a differential amplifying circuit, a microprocessor, a communication module and a touch display screen which are sequentially connected, wherein the touch display screen is bidirectionally connected with the microprocessor, the microprocessor is in communication connection with a PC (personal computer) through the communication module, the output end of the PC is electrically connected with the driving end of the grinding machine tool, and the power supply module is used for supplying working power to the differential amplifying circuit, the microprocessor and the communication module. The differential amplifying circuit adopts an integrated differential amplifying chip which is well known in the prior art, such as a chip with the model number of AD524AR, and the amplifying gain of the differential amplifying circuit is selected to be 100 times; the microprocessor adopts the existing known microprocessor, such as a microprocessor with the model number STM32F 767; the communication module adopts an Ethernet communication mode to transmit the digital signal to the PC through the Ethernet.
In this embodiment, the temperature sampling device is a conventional temperature sampling device, for example, a thermocouple sensor mentioned in the applicant's application No. 201910089047.2 entitled "a method and device for online monitoring of grinding wheel dull state", and the working method of the temperature sampling device is the same as the method for online monitoring of grinding wheel dull state. The temperature sampling device comprises a sampling block and a thermocouple sensor embedded on the sampling block, the sampling block is fixedly installed on the workbench through a support, the sensing surface of the thermocouple sensor and the grinding surface of the sampling block are located on the same plane, and the grinding surface of the sampling block refers to the upper side surface of the sampling block when the sampling block is installed on the workbench of the grinding machine tool. And the sampling end of the thermocouple sensor is electrically connected with the input end of the differential amplification circuit.
The pressure device is a film pressure sensor, and the sampling end of the film pressure sensor is electrically connected with the input end of the differential amplification circuit. The film pressure sensor is arranged on the workbench and clamped between the grinding part and the workbench or on the side surface of the workbench.
In step a2, the specific process of collecting the information of the grinding part is as follows: when the grinding wheel grinds a grinding part, the film pressure sensor collects a generated grinding force signal in unit time As at intervals (the interval time is set according to actual conditions), then the grinding wheel moves to the sampling block, the thermocouple sensor collects a generated grinding temperature signal in unit time As, and then the grinding wheel returns to the grinding part again to grind the grinding part. Wherein, the unit time As can be 10-100s, and the unit time As is set according to the actual situation. It should be noted that the interval time range of each acquisition in the unit time (As) is 0.1-1s, the specific interval time is set according to the actual situation, and the time of each acquisition interval in the acquired grinding force signal and the acquired grinding temperature signal is the same.
In the invention, both a temperature signal set and a force signal set can be presented as a section of electric wave in unit time, the temperature signal set comprises a temperature high-frequency signal, and the force signal set comprises a force high-frequency signal. The specific process of acquiring the grinding part data in the step a3 is as follows: extracting all high-frequency signals in one force signal set, and averaging all the high-frequency signals to obtain the grinding force of the grinding part; and extracting all temperature high-frequency signals in one grinding temperature signal set, and averaging all the temperature high-frequency signals to obtain the temperature of a grinding contact area, wherein the temperature of the grinding contact area refers to the grinding surface of the grinding wheel.
In step a3, the specific steps of obtaining the fluctuation frequency from one force signal set are:
b1 extraction signal: extracting all high-frequency signals in one force signal set in the step A3;
b2, acquiring data: taking the grinding force signal acquired for the first time in unit time as a starting point, and acquiring a first valley value F by adopting a comparative difference method1And a first peak value F1', corresponding to time t1The first force fluctuation is then Δ F1＝F1’-F1(ii) a Then obtaining a second wave valley value F by adopting a comparison difference method2And a second wave crest value F2', corresponding to time t2The second force fluctuation is of magnitude Δ F2＝F2’-F2(ii) a By analogy, the nth trough value FnAnd nth wave crest value Fn', the nth force fluctuation size is DeltaFn＝Fn’-FnCorresponding to time tn，；
B3: calculating the fluctuation frequency: using a formula
n is a positive integer, and the fluctuation frequency P is calculated;
in step B1, all the force high-frequency signals in one force signal set are converted into digital signals by the signal acquisition unit and output to the PC, and the PC forms the change curve of the grinding force per unit time with all the digital signals in the force signal set.
In the present invention, in step a1, an amplitude threshold value obtained by analyzing the relationship between the occurrence of grinding cracks in the grinding material and the magnitude of the amplitude is also manually set, and the amplitude threshold value can be obtained through a large number of experiments.
In step a4, when the grinding state of the grinding wheel is determined by using the PC, it is determined whether the fluctuation between each wave trough and the adjacent wave crest is stable or severe while comparing the grinding force of the grinding part with the grinding force threshold, and the specific determination is as follows:
and comparing the magnitude of each force fluctuation with the magnitude of an amplitude threshold, if the magnitude of each force fluctuation is smaller than or equal to the magnitude of the amplitude threshold, judging that all force high-frequency signals in one force signal set are stable fluctuation, and otherwise, judging that at least one force high-frequency signal in one force signal set is severe fluctuation.
And when the grinding force of the grinding part is smaller than the grinding force threshold value and the temperature of the grinding contact area is smaller than the temperature threshold value, and all force high-frequency signals with one force signal concentrated are stable fluctuation, judging that the grinding wheel is in a stable state.
Preferably, the force oscillation information further includes an amplitude and an average grinding force, and after the step B3, further includes the steps of:
b4: calculating the amplitude: by mean fluctuation of grinding force Δ FnEvaluating the amplitude H of the grinding force by using a formula
n is a positive integer, and the amplitude H is calculated;
b5: calculating average grinding force by obtaining the average value F of the force of N sampling points in unit timeNBy the formula
N is a positive integer and N>n, calculating average grinding force
In step B3, the amplitude H obtained by processing the unit time is compared with the amplitude threshold value by the PC to determine whether the average fluctuation value of the grinding force of the grinding wheel per unit time exceeds the amplitude threshold value, thereby determining the overall stability of the grinding wheel per unit time.
In step B4, the average grinding force obtained by the processing per unit time is compared with the grinding force threshold value by the PC to determine whether the average grinding force of the grinding wheel exceeds the grinding force threshold value per unit time, thereby determining the overall stability of the grinding wheel per unit time.
Thus, the grinding state of the grinding wheel is judged as a whole.
According to the invention, the PC machine can obtain the fluctuation frequency, the amplitude and the variation trend of the grinding force by calculating the fluctuation frequency, the amplitude and the average grinding force of the grinding wheel in unit time.
In step a5, when the grinding wheel is judged not to be vibrated, the PC stops the grinding machine and alerts (possibly by emitting a corresponding alarm or light) the operator that the grinding wheel needs to be treated, and then the operator sharpens the grinding wheel.
In step a5, when the grinding wheel is judged to vibrate, the PC judges the vibration cause of the grinding wheel, and reminds (may send out a corresponding alarm sound or light) an operator that the grinding machine tool has a problem and needs to be adjusted, the operator adjusts the grinding parameters of the grinding machine tool or adjusts the grinding process system according to the vibration cause of the grinding part, where the vibration cause of the grinding wheel mainly includes wear of a spindle sleeve of the grinding wheel, damage of the grinding wheel, occurrence of a problem on the grinding part or a fixture on the grinding machine tool, and deterioration of the wear degree of the grinding wheel, and the PC determines the vibration cause of the grinding wheel according to the following method:
1. if the fluctuation frequency in unit time is equal to or in positive integral multiple with the numerical value of the rotating speed of the motor on the grinding machine tool, judging the abrasion of the main shaft sleeve of the grinding wheel or the damage of the grinding wheel;
2. if the fluctuation frequency in unit time is integral multiple of the round-trip speed of the grinding part on the grinding machine tool, judging that the grinding part or the clamp on the grinding machine tool has a problem;
3. if the fluctuation frequencies in the unit time are not regularly distributed, the abrasion degree of the grinding wheel is judged to be seriously deteriorated.
In the process of grinding a grinding part by using the grinding wheel, the grinding wheel moves to the sampling block at intervals, and the sensing surface of the thermocouple sensor is ground, so that a grinding temperature signal is collected, and a grinding temperature signal set is obtained; when the grinding wheel applies grinding force to the grinding part, the film pressure sensor senses the pressure in real time, so that grinding force signals are collected, and a force signal set is obtained.
In the invention, the signal collector is provided with a plurality of channel signal receiving ports, namely, the signal collector can receive grinding force signals of grinding temperature signals from a plurality of grinding machine tools, so that the signal collector can be matched with a plurality of distributed grinding machine tools in a factory to collect data of grinding wheels on the plurality of grinding machine tools, and the collected data is transmitted to the same PC for analysis and judgment to obtain the grinding state and the vibration condition of the grinding wheel on each grinding machine tool, and then the grinding state and the vibration condition of each grinding wheel are respectively processed, thus realizing the real-time online monitoring of the grinding state of the grinding wheel on each grinding machine tool in intelligent manufacturing.
In the invention, the touch display screen is an LCD touch display screen which is used for displaying the signal acquisition state and selecting the working mode.
The invention discloses a grinding monitoring method based on thermal coupling, which comprehensively analyzes temperature high-frequency signals concentrated by temperature signals of a grinding wheel, high-frequency signals concentrated by force signals and force vibration information, identifies the grinding state and the vibration condition of the grinding wheel during grinding of the grinding wheel, and sends a control instruction to a grinding machine tool, wherein the control instruction comprises a command for adjusting grinding parameters, a grinding process system, a stop alarm command or a stop grinding wheel finishing command, so that the grinding state of the grinding wheel is monitored in real time and adjusted in time, the grinding wheel is ensured to be in a stable state during grinding, and the grinding quality of the grinding wheel is ensured.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.
Claims (10)
1. A grinding monitoring method based on thermal coupling is characterized by comprising the following steps:
a1, setting threshold: determining a grinding force threshold value of a grinding part generating grinding cracks, determining a temperature threshold value of the surface of the grinding part generating burn and determining a fluctuation threshold value of the grinding part generating vibration;
a2, acquiring grinding part information: collecting grinding temperature signals and grinding force signals at intervals in unit time in the grinding process of a grinding part, wherein the grinding temperature signals collected in unit time form a temperature signal set, and the grinding force signals collected in unit time form a force signal set;
a3, acquiring grinding part data: averaging the temperature signal set to obtain the temperature of a grinding contact area, averaging the force signal set to obtain the grinding force of a grinding part, and carrying out centralized processing on the force signal to obtain force vibration information, wherein the force vibration information comprises a plurality of fluctuation frequencies;
a4, analysis and judgment: comparing the temperature of the grinding contact area with the temperature threshold value, and comparing the grinding force of the grinding part with the grinding force threshold value;
when the temperature of the grinding contact area is smaller than the temperature threshold value and the grinding force of the grinding part is smaller than the grinding force threshold value, judging that the grinding part is in a stable grinding state, and then repeating the steps A2-A4;
when the temperature of the grinding contact area is larger than or equal to the temperature threshold value and/or the grinding force of the grinding part is larger than or equal to the grinding force threshold value, judging that the grinding part is in a wear state, and continuing to the next step;
a5, analyzing vibration condition: comparing the fluctuation frequency with the fluctuation threshold value, and judging that the grinding part does not vibrate when the fluctuation frequency is smaller than the fluctuation threshold value, and reminding an operator that the grinding part needs to be processed; and when the size of at least one fluctuation frequency is larger than or equal to the size of the fluctuation threshold value, judging that the grinding part vibrates, reminding an operator that the grinding machine needs to be adjusted, and repeating the steps A2-A5.
2. A grinding monitoring method based on thermal coupling according to claim 1, characterized in that: in the step A2, a temperature sampling device is adopted to collect grinding temperature signals, and the grinding temperature signals are converted into digital signals through a signal collector and transmitted to a PC;
and collecting a grinding force signal by adopting a pressure device, converting the grinding force signal into a digital signal by the signal collector, and transmitting the digital signal to the PC.
3. A grinding monitoring method based on thermal coupling according to claim 2, characterized in that: the signal collector comprises a power supply module, a differential amplifying circuit, a microprocessor, a communication module and a touch display screen, wherein the differential amplifying circuit, the microprocessor and the communication module are sequentially connected, the touch display screen is used for displaying a signal collecting state and selecting a working mode, the touch display screen is bidirectionally connected with the microprocessor, the microprocessor is connected with a PC through the communication module, the output end of the PC is electrically connected with the driving end of the grinding machine tool, and the power supply module is used for providing a working power supply for the differential amplifying circuit, the microprocessor, the communication module and the touch display screen.
4. A grinding monitoring method based on thermal coupling according to claim 1 or 2, characterized in that: in step a3, the specific way of obtaining the grinding contact zone temperature by averaging the temperature signal set is as follows: and extracting all grinding temperature signals in one temperature signal set, averaging all the grinding temperature signals, and obtaining the temperature of the grinding contact area through the averaged value.
5. A grinding monitoring method based on thermal coupling according to claim 1 or 2, characterized in that: in step a3, the specific way of obtaining the grinding force of the grinding part by averaging the force signal set is as follows: and extracting all grinding force signals in one force signal set, averaging all the grinding force signals, and identifying the grinding force of the grinding part according to the averaged value.
6. A grinding monitoring method based on thermal coupling according to claim 1, characterized in that: in step a3, the process of obtaining the force vibration information according to one force signal set is:
b1: extracting a signal: extracting all grinding force signals in one force signal set;
b2: acquiring data: the grinding force signal collected firstly in unit time is taken as a starting point, and a first wave valley value F is obtained by a comparative difference method1And a first peak value F1 ’Corresponding to time t1The first force fluctuation is then Δ F1= F1 ’- F1(ii) a Then obtaining a second wave valley value F by a comparison difference value method2And a second wave crest value F2 ’Corresponding to time t2The second force fluctuation is of magnitude Δ F2= F2 ’- F2(ii) a By analogy, the nth trough value FnAnd nth wave crest value Fn ’The nth force fluctuation is DeltaFn= Fn ’- FnCorresponding to time tn；
B3: calculating the fluctuation frequency: adopting a formula P =
N is 1, 2, … …, and n is a positive integer, the fluctuation frequency P is calculated.
7. A grinding monitoring method based on thermal coupling according to claim 6, characterized in that: the grinding machine is applied to a grinding machine tool, a grinding part is mounted on a workbench of the grinding machine tool, when the grinding part vibrates, the vibration reason of the grinding part is judged, and the judgment mode is as follows:
if the fluctuation frequency is equal to or in positive integral multiple with the rotating speed value of the motor on the grinding machine tool, judging that the main shaft sleeve of the grinding part is worn or the grinding part is damaged;
if the numerical value of the fluctuation frequency and the round-trip speed of the grinding part on the grinding machine tool is integral multiple, judging that the grinding part or the clamp on the grinding machine tool has a problem;
and if a plurality of fluctuation frequencies in unit time are distributed irregularly, judging that the abrasion degree of the grinding part is seriously deteriorated.
8. A grinding monitoring method based on thermal coupling according to claim 6, characterized in that: the force oscillation information further includes an amplitude and an average grinding force, and after the step B3, further includes the steps of:
b4: calculating the amplitude: by mean fluctuation of grinding force Δ FnEvaluating the amplitude H of the grinding force by using a formula
N is a positive integer, and the amplitude H is calculated;
b5: calculating average grinding force by obtaining the average value F of the force of N sampling points in unit timeNBy the formula
N is a positive integer and N>n, calculating average grinding force
。
9. A grinding monitoring method based on thermal coupling according to claim 3, characterized in that: the pressure device comprises a film pressure sensor, and the film pressure sensor is clamped between a workbench of the grinding machine tool and the grinding part; the temperature sampling device comprises a sampling block and a thermocouple sensor arranged on the sampling block, and the sampling block is arranged on the workbench; the sampling end of the film pressure sensor and the sampling end of the thermocouple sensor are both electrically connected with the input end of the differential amplification circuit.
10. A grinding monitoring method based on thermal coupling according to claim 3, characterized in that: the signal collector is provided with a plurality of channel signal receiving ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911093209.6A CN111015370B (en) | 2019-11-11 | 2019-11-11 | Grinding monitoring method based on thermal coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911093209.6A CN111015370B (en) | 2019-11-11 | 2019-11-11 | Grinding monitoring method based on thermal coupling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111015370A CN111015370A (en) | 2020-04-17 |
| CN111015370B true CN111015370B (en) | 2021-07-02 |
Family
ID=70205310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911093209.6A Active CN111015370B (en) | 2019-11-11 | 2019-11-11 | Grinding monitoring method based on thermal coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111015370B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85204973U (en) * | 1985-11-04 | 1987-12-12 | 中国纺织大学 | Control system for grinding burn |
| FR2603218B1 (en) * | 1986-09-01 | 1994-03-11 | Meseltron Sa | WIRELESS DEVICE FOR CONTROLLING THE FEED SPEED OF A TOOL TO A WORKPIECE. |
| CN101733704A (en) * | 2009-11-26 | 2010-06-16 | 上海大学 | System and method for measuring thermal stress for cam machining on line |
| WO2012098805A1 (en) * | 2011-01-21 | 2012-07-26 | 株式会社ジェイテクト | Grinding abnormality monitoring method and grinding abnormality monitoring device |
| CN104742002B (en) * | 2015-03-19 | 2017-03-08 | 华南理工大学 | A kind of intelligent grinding attachment of short pulse electric smelting chip removal cooling |
| CN106124121A (en) * | 2016-08-31 | 2016-11-16 | 北京君通电信设备维修有限公司 | A kind of therrmodynamic system pressure monitor system and therrmodynamic system |
| CN107064450B (en) * | 2017-03-14 | 2019-04-26 | 中国矿业大学 | Coal body stream consolidates the experimental method of thermalization multi- scenarios method under a kind of simulation Thermal-mechanical Coupling |
| CN110539239A (en) * | 2018-05-29 | 2019-12-06 | Tdk株式会社 | Preparatory machining device, and machining state detection device |
-
2019
- 2019-11-11 CN CN201911093209.6A patent/CN111015370B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111015370A (en) | 2020-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105215852B (en) | Device and method for measuring abrasion of grinding wheel and G ratio | |
| CN107756250B (en) | A kind of grinding power and energy consumption intelligent monitor system and decision-making technique | |
| US7163435B2 (en) | Real time monitoring of CMP pad conditioning process | |
| US3694637A (en) | Method and apparatus for detecting tool wear | |
| Webster et al. | Raw acoustic emission signal analysis of grinding process | |
| CN101829951B (en) | Outer circle grinding workpiece surface quality visualized real-time monitoring method | |
| Moia et al. | Tool condition monitoring of aluminum oxide grinding wheel in dressing operation using acoustic emission and neural networks | |
| US5044125A (en) | Method and apparatus for controlling grinding processes | |
| JP3439324B2 (en) | Wheel life judgment device | |
| Sutowski et al. | Monitoring of cylindrical grinding processes by use of a non-contact AE system | |
| CN107427983A (en) | Have the method and milling drum of slotted workpiece for being ground | |
| CN113841163A (en) | Method for determining status information relating to a belt sander by means of a machine learning system | |
| JPH01281849A (en) | Method and device for controlling adaptation of locus in machining work | |
| Liu et al. | Evaluation of grinding wheel loading phenomena by using acoustic emission signals | |
| CN111015370B (en) | Grinding monitoring method based on thermal coupling | |
| JP2006281402A (en) | Method and apparatus for judging condition of grinding operation, and method for controlling grinding operation | |
| Lin et al. | Characterization of grinding wheel condition by acoustic emission signals | |
| JPH09174383A (en) | Abnormality detection method and device for rotating tool | |
| CN107633122B (en) | Grinding burn monitoring method based on power signals | |
| US5025594A (en) | Method and apparatus for controlling grinding processes | |
| CN109648478B (en) | Method and device for on-line monitoring grinding wheel grinding state | |
| JP6571261B2 (en) | Wafer chamfering device | |
| Junior et al. | Wear monitoring of single-point dresser in dry dressing operation based on neural models | |
| JP6144545B2 (en) | Wafer chamfering equipment | |
| CN112798453B (en) | Abrasive belt abrasion detection method based on multi-sensor information fusion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |