CN109839352B - Method and device for detecting fit degree between metal workpiece and coating - Google Patents
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Abstract
The invention discloses a method and a device for detecting the fit degree between a metal workpiece and a coating, and belongs to the field of detection. The method comprises the following steps: detecting a detected metal workpiece through a piezoelectric ceramic sensor, wherein a probe of the piezoelectric ceramic sensor is attached to the surface of the detected metal workpiece, and the surface of the detected metal workpiece is coated with a coating; receiving a reflected voltage signal detected by the piezoelectric ceramic sensor according to a preset first time interval; converting the reflected voltage signal into a first reflected waveform signal in digital form; acquiring a second reflected wave signal most similar to the first reflected wave signal from a preset corresponding relation between the second reflected wave signal and the fitting degree; and determining the attaching degree corresponding to the acquired second reflected wave signal as the attaching degree between the detected metal workpiece and the coating. The invention can avoid resource waste.
Description
Technical Field
The invention relates to the field of detection, in particular to a method and a device for detecting the fit degree between a metal workpiece and a coating.
Background
It is now common to apply a coating to the surface of a metal workpiece to protect the metal workpiece. For example, a paint may be applied to the surface of the metal workpiece, which is protected from oxidation or corrosion by the paint.
The degree of adhesion between the metal workpiece and the coating directly affects the protection of the coating on the metal workpiece, so that the degree of adhesion between the metal workpiece and the coating needs to be detected at present. At present, destructive detection is mainly carried out, firstly, an adhesive tape is pasted on a metal workpiece coated with a coating, then, the adhesive tape is torn off, the more coatings are taken away by the adhesive tape, the lower the bonding degree between the metal workpiece and the coating is, the less coatings are taken away by the adhesive tape, and the higher the bonding degree between the metal workpiece and the coating is.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
the existing scheme is destructive detection, a coating of a metal workpiece needs to be destroyed, and when the fitting degree of the metal workpiece and the coating is very high, namely the coating of the metal workpiece is destroyed when a product is qualified, so that resource waste is caused.
Disclosure of Invention
In order to avoid resource waste, the invention provides a method and a device for detecting the fit degree between a metal workpiece and a coating. The technical scheme is as follows:
in one aspect, a method of detecting a degree of conformance between a metal workpiece and a coating is provided, the method comprising:
detecting a detected metal workpiece through a piezoelectric ceramic sensor, wherein a probe of the piezoelectric ceramic sensor is attached to the surface of the detected metal workpiece, and the surface of the detected metal workpiece is coated with a coating;
receiving a reflected voltage signal detected by the piezoelectric ceramic sensor according to a preset first time interval, wherein the reflected voltage signal comprises a first reflected voltage signal of the detected metal workpiece and a second reflected voltage signal of the coating;
converting the reflected voltage signal into a first reflected waveform signal in digital form;
acquiring a second reflected wave signal most similar to the first reflected wave signal from a preset corresponding relation between the second reflected wave signal and the fitting degree;
and determining the attaching degree corresponding to the acquired second reflected wave signal as the attaching degree between the detected metal workpiece and the coating.
Optionally, before the obtaining a second reflected wave signal most similar to the first reflected wave signal from a preset corresponding relationship between the second reflected wave signal and the degree of attachment, the method further includes:
receiving a noise voltage signal collected by the piezoelectric ceramic sensor according to a preset second time interval, wherein the preset second time interval is greater than the preset first time interval;
and converting the noise voltage signal into a noise signal in a digital form, and if the size of the noise signal is smaller than a preset first threshold, executing the operation of acquiring a second reflected wave signal most similar to the first reflected wave signal from the corresponding relation between a preset second reflected wave signal and the fitting degree.
Optionally, before the obtaining a second reflected wave signal most similar to the first reflected wave signal from a preset corresponding relationship between the second reflected wave signal and the degree of attachment, the method further includes:
receiving the capacitance of the piezoelectric ceramic sensor sent by the piezoelectric ceramic sensor according to a preset third time interval, wherein the preset third time interval is greater than the preset first time interval;
and converting the capacitance into a capacitance in a digital form, and if the converted capacitance is a preset second threshold, performing the operation of obtaining a second reflected wave signal most similar to the first reflected wave signal from a preset correspondence between the second reflected wave signal and the degree of attachment.
In another aspect, there is provided an apparatus for detecting a degree of conformance between a metal workpiece and a coating, the apparatus comprising:
the detection module is used for detecting the detected metal workpiece through a piezoelectric ceramic sensor, a probe of the piezoelectric ceramic sensor is attached to the surface of the detected metal workpiece, and the surface of the detected metal workpiece is coated with a coating;
the receiving module is used for receiving reflected voltage signals collected by the piezoelectric ceramic sensor according to a preset first time interval, wherein the reflected voltage signals comprise a first reflected voltage signal of the detected metal workpiece and a second reflected voltage signal of the coating;
the conversion module is used for converting the reflected voltage signal into a first reflected waveform signal in a digital form;
the acquisition module is used for acquiring a second reflected wave signal which is most similar to the first reflected wave signal from the corresponding relation between a preset second reflected wave signal and the fitting degree;
and the determining module is used for determining the fit degree corresponding to the acquired second reflected wave signal as the fit degree between the detected metal workpiece and the coating.
Optionally, the receiving module is further configured to receive a noise voltage signal collected by the piezoelectric ceramic sensor according to a preset second time interval, where the preset second time interval is greater than the preset first time interval;
the conversion module is further used for converting the noise voltage signal into a noise signal in a digital form;
the obtaining module is configured to, if the size of the noise signal is smaller than a preset first threshold, perform an operation of obtaining a second reflected wave signal that is most similar to the first reflected wave signal from a correspondence between a preset second reflected wave signal and a degree of attachment.
Optionally, the receiving module is further configured to receive, according to a preset third time interval, the capacitance of the piezoelectric ceramic sensor sent by the piezoelectric ceramic sensor, where the preset third time interval is greater than the preset first time interval;
the conversion module is also used for converting the capacitance into the capacitance in a digital form;
and the obtaining module is used for obtaining a second reflected wave signal which is most similar to the first reflected wave signal from the corresponding relation between the preset second reflected wave signal and the fitting degree if the converted capacitance is a preset second threshold value.
The technical scheme provided by the invention has the beneficial effects that:
the method comprises the steps of detecting a detected metal workpiece through a piezoelectric ceramic sensor to obtain a reflected voltage signal, converting the reflected voltage signal into a first reflected waveform signal, obtaining a second reflected waveform signal which is most similar to the first reflected waveform signal from a preset corresponding relation between the second reflected waveform signal and the fitting degree, and determining the fitting degree corresponding to the second reflected waveform signal as the fitting degree between the detected metal workpiece and a coating, so that destructive detection on the detected metal workpiece is not needed, and resource waste is avoided.
Drawings
Fig. 1 is a schematic diagram of a network architecture according to embodiment 1 of the present invention;
FIG. 2 is a flowchart of a method for detecting the degree of adhesion between a metal workpiece and a coating according to example 2 of the present invention;
FIG. 3 is a flowchart of a method for detecting the degree of conformity between a metal workpiece and a coating according to example 3 of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for detecting a degree of adhesion between a metal workpiece and a coating provided in embodiment 4 of the present invention and provided in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, fig. 1 is a network architecture provided in an embodiment of the present invention, including:
the piezoelectric ceramic sensor is connected with the AD conversion chip, and the AD conversion chip is connected with the computer.
The probe of the piezoelectric ceramic sensor is attached to the surface of the detected metal workpiece, the surface of the detected metal workpiece is coated with a coating and used for detecting the detected metal workpiece, and the detected reflected voltage signal is sent to the AD conversion chip and comprises a first reflected voltage signal of the detected metal workpiece and a second reflected voltage signal of the coating.
And the AD conversion chip is used for receiving the reflected voltage signal detected by the piezoelectric ceramic sensor according to a preset first time interval, converting the reflected voltage signal into a first reflected waveform signal in a digital form, and sending the first reflected waveform signal to the computer.
The computer is used for receiving the first reflected waveform signal and acquiring a second reflected wave signal which is most similar to the first reflected waveform signal from the corresponding relation between the preset second reflected waveform signal and the bonding degree; and determining the degree of fit corresponding to the acquired second reflected wave signal as the degree of fit between the metal workpiece to be detected and the coating.
And data acquisition and analysis software is installed in the computer, the data acquisition and analysis software comprises a preset corresponding relation between a second reflection waveform signal and the fitting degree, and the fitting degree between the detected metal workpiece and the coating can be obtained through the data acquisition and analysis software.
Example 2
Referring to fig. 2, an embodiment of the present invention provides a method for detecting a degree of conformity between a metal workpiece and a coating, including:
step 201: and detecting the metal workpiece to be detected through the piezoelectric ceramic sensor, wherein a probe of the piezoelectric ceramic sensor is attached to the surface of the metal workpiece to be detected, and the surface of the metal workpiece to be detected is coated with a coating.
Step 202: and receiving a reflected voltage signal detected by the piezoelectric ceramic sensor according to a preset first time interval, wherein the reflected voltage signal comprises a first reflected voltage signal of the detected metal workpiece and a second reflected voltage signal of the coating.
Step 203: the reflected voltage signal is converted into a first reflected waveform signal in digital form.
Step 204: acquiring a second reflected wave signal most similar to the first reflected wave signal from a preset corresponding relation between the second reflected wave signal and the fitting degree;
step 205: and determining the degree of fit corresponding to the acquired second reflected wave signal as the degree of fit between the metal workpiece to be detected and the coating.
Optionally, before performing step 204, the method further includes:
receiving a noise voltage signal collected by the piezoelectric ceramic sensor according to a preset second time interval, wherein the preset second time interval is greater than the preset first time interval;
the noise voltage signal is converted into a noise signal in a digital form, and if the magnitude of the noise signal is smaller than a preset first threshold, the operation of step 204 is performed.
Optionally, before performing step 204, the method further includes:
receiving the capacitance of the piezoelectric ceramic sensor sent by the piezoelectric ceramic sensor according to a preset third time interval, wherein the preset third time interval is greater than the preset first time interval;
the capacitance is converted into a digital form, and if the converted capacitance is a preset second threshold value, the above operation of step 204 is performed.
In the embodiment of the invention, the detected metal workpiece is detected by the piezoelectric ceramic sensor to obtain the reflected voltage signal, the reflected voltage signal is converted into the first reflected waveform signal, the second reflected waveform signal which is most similar to the first reflected waveform signal is obtained from the preset corresponding relation between the second reflected waveform signal and the bonding degree, and the bonding degree corresponding to the second reflected waveform signal is determined as the bonding degree between the detected metal workpiece and the coating, so that destructive detection on the detected metal workpiece is not required, and resource waste is avoided.
Example 3
Referring to fig. 3, an embodiment of the present invention provides a method for detecting a degree of conformity between a metal workpiece and a coating, where the method is applied to a network architecture shown in the embodiment, and the method includes:
step 301: the piezoelectric ceramic sensor detects the detected metal workpiece to obtain a reflected voltage signal, wherein the reflected voltage signal comprises a first reflected voltage signal of the detected metal workpiece and a coating on the detected metal workpiece
The second reflected voltage signal.
The surface of the metal workpiece to be detected is coated with a coating which can be an organic material such as paint and the like, and the coating is used for protecting the metal workpiece to be detected and preventing the metal workpiece to be detected from being oxidized and corroded. Tiny bubbles may exist between the metal workpiece to be detected and the coating, and the attaching degree between the metal workpiece to be detected and the coating is influenced. The lower the bonding degree between the metal workpiece to be detected and the coating is, the more tiny bubbles exist between the metal workpiece to be detected and the coating; the higher the degree of adhesion between the metal workpiece to be inspected and the coating, the fewer fine bubbles exist between the metal workpiece to be inspected and the coating.
The low degree of adhesion between the metal workpiece to be detected and the coating indicates that many fine bubbles exist between the metal workpiece to be detected and the coating, so that the metal workpiece to be detected is easy to fall off in the using process and cannot protect the metal workpiece to be detected.
When the piezoelectric ceramic sensor detects the detected metal workpiece, a probe of the piezoelectric ceramic sensor needs to be attached to the surface of the detected metal workpiece, and transmits a signal to the detected metal workpiece according to a preset frequency. The signal is reflected by the inspected metal workpiece and the coating on the inspected metal workpiece. The piezoelectric ceramic sensor receives the signal reflected by the detected metal workpiece and forms a first reflected voltage signal of the detected metal workpiece, and receives the signal reflected by the coating and forms a second reflected voltage signal of the coating.
Step 302: and the piezoelectric ceramic sensor sends a reflected voltage signal to the AD conversion chip.
When the probe of the piezoelectric ceramic sensor is not attached to the surface of the detected metal workpiece, the piezoelectric ceramic sensor generates a noise voltage signal and sends the noise voltage signal to the AD conversion chip.
The probe of the piezoelectric ceramic sensor has capacitance property, and the piezoelectric ceramic sensor can detect the capacitance of the probe and send the capacitance to the AD conversion chip in the form of a voltage signal.
Step 303: the AD conversion chip receives a reflected voltage signal detected by the piezoelectric ceramic sensor according to a preset first time interval.
The AD conversion chip comprises a data acquisition module, a coupling detection module, a probe capacitance detection module and a communication module; the data acquisition module, the coupling detection module and the probe capacitance detection module are all connected with the communication module, and the communication module is connected with the computer. The communication module can be a USB port on the AD conversion chip and can be connected with a computer through a USB data line.
And the data acquisition module is used for receiving the reflected voltage signals detected by the piezoelectric ceramic sensor according to a preset first time interval, namely the time interval of receiving the reflected voltage signals at any two adjacent times is the preset first time interval.
And the coupling detection module is used for receiving the noise voltage signal collected by the piezoelectric ceramic sensor according to a preset second time interval, wherein the preset second time interval is greater than the preset first time interval.
And the probe capacitance detection module is used for receiving the capacitance of the piezoelectric ceramic sensor sent by the piezoelectric ceramic sensor according to a preset third time interval, and the preset third time interval is greater than the preset first time interval.
Step 304: the AD conversion chip converts the reflected voltage signal into a first reflected waveform signal in a digital form, and sends the first reflected waveform signal to a computer.
Specifically, the data acquisition module converts the reflected voltage signal into a first reflected waveform signal in a digital form, and the first reflected waveform signal is sent to the computer through the communication module.
Further, the coupling detection module also converts the noise voltage signal into a noise signal in a digital form, and the noise signal is transmitted to the computer through the communication module.
And further, the probe capacitance detection module converts the capacitance into digital capacitance, and transmits the digital capacitance to the computer through the communication module.
Step 305: and the computer receives the first reflected waveform signal and acquires a second reflected wave signal which is most similar to the first reflected waveform signal from the corresponding relation between the preset second reflected waveform signal and the bonding degree.
And data acquisition and analysis software is installed in the computer, and the data acquisition and analysis software comprises a preset corresponding relation between the second reflection waveform signal and the fitting degree. The computer runs the data acquisition and analysis software, and the data acquisition and analysis software executes the operation of the step. The method specifically comprises the following steps:
and for each second reflection waveform signal in the preset corresponding relation between the second reflection waveform signal and the fitting degree, the computer respectively calculates the similarity between each second reflection waveform signal and the first reflection waveform signal, and selects the second reflection waveform signal with the maximum similarity with the first reflection waveform signal.
Further, the computer can also receive a noise signal sent by the AD conversion chip, and if the size of the noise signal is smaller than a preset first threshold value, the step is executed again.
If the size of the noise signal is larger than or equal to a preset first threshold value, it is indicated that the piezoelectric ceramic sensor is not attached to the surface of the detected metal workpiece, the first reflection waveform signal contains more noise, and the accuracy of the attachment degree between the detected metal workpiece and the coating determined according to the first reflection waveform signal is low. In this case, therefore, the received first reflected waveform signal may be discarded, waiting for the first reflected waveform signal retransmitted by the AD conversion chip.
And further, the computer can also receive the capacitance sent by the AD conversion chip, and if the capacitance is a preset second threshold value, the step is executed.
The preset second threshold is the probe capacitance of the piezoelectric ceramic sensor in a normal state. If the capacitance is not the predetermined second threshold, indicating that the piezo-ceramic sensor may be damaged, the signal picked up by the piezo-ceramic sensor may be inaccurate, i.e. the first reflected waveform signal may be inaccurate, and therefore the first reflected waveform signal may need to be discarded.
Step 306: and the computer determines the fit degree corresponding to the acquired second reflected wave signal as the fit degree between the metal workpiece to be detected and the coating.
In the embodiment of the invention, the detected metal workpiece is detected by the piezoelectric ceramic sensor to obtain the reflected voltage signal, the reflected voltage signal is converted into the first reflected waveform signal, the second reflected waveform signal which is most similar to the first reflected waveform signal is obtained from the preset corresponding relation between the second reflected waveform signal and the bonding degree, and the bonding degree corresponding to the second reflected waveform signal is determined as the bonding degree between the detected metal workpiece and the coating, so that destructive detection on the detected metal workpiece is not required, and resource waste is avoided.
Example 4
Referring to fig. 4, an embodiment of the present invention provides an apparatus 400 for detecting a degree of conformance between a metal workpiece and a coating, the apparatus 400 comprising:
the detection module 401 is configured to detect a detected metal workpiece through a piezoelectric ceramic sensor, wherein a probe of the piezoelectric ceramic sensor is attached to a surface of the detected metal workpiece, and a coating is coated on the surface of the detected metal workpiece;
a receiving module 402, configured to receive, at a preset first time interval, reflected voltage signals acquired by the piezoelectric ceramic sensor, where the reflected voltage signals include a first reflected voltage signal of the detected metal workpiece and a second reflected voltage signal of the coating;
a conversion module 403, configured to convert the reflected voltage signal into a first reflected waveform signal in a digital form;
an obtaining module 404, configured to obtain a second reflected wave signal that is most similar to the first reflected wave signal from a preset correspondence between a second reflected wave signal and a degree of attachment;
a determining module 405, configured to determine a degree of conformity corresponding to the acquired second reflected wave signal as a degree of conformity between the inspected metal workpiece and the coating.
Optionally, the receiving module 402 is further configured to receive a noise voltage signal collected by the piezoelectric ceramic sensor according to a preset second time interval, where the preset second time interval is greater than the preset first time interval;
the conversion module 403 is further configured to convert the noise voltage signal into a noise signal in a digital form;
the obtaining module 404 is configured to, if the size of the noise signal is smaller than a preset first threshold, perform an operation of obtaining a second reflected wave signal that is most similar to the first reflected wave signal from a preset corresponding relationship between a second reflected wave signal and a degree of attachment.
Optionally, the receiving module 402 is further configured to receive, according to a preset third time interval, the capacitance of the piezoelectric ceramic sensor sent by the piezoelectric ceramic sensor, where the preset third time interval is greater than the preset first time interval;
the conversion module 403 is further configured to convert the capacitance into a digital capacitance;
the obtaining module 404 is configured to, if the converted capacitance is a preset second threshold, perform the operation of obtaining a second reflected wave signal that is most similar to the first reflected wave signal from a preset corresponding relationship between a second reflected wave signal and a degree of fitting.
In the embodiment of the invention, the detected metal workpiece is detected by the piezoelectric ceramic sensor to obtain the reflected voltage signal, the reflected voltage signal is converted into the first reflected waveform signal, the second reflected waveform signal which is most similar to the first reflected waveform signal is obtained from the preset corresponding relation between the second reflected waveform signal and the bonding degree, and the bonding degree corresponding to the second reflected waveform signal is determined as the bonding degree between the detected metal workpiece and the coating, so that destructive detection on the detected metal workpiece is not required, and resource waste is avoided.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method of detecting a degree of conformance between a metal workpiece and a coating, the method comprising:
detecting a detected metal workpiece through a piezoelectric ceramic sensor, wherein a probe of the piezoelectric ceramic sensor is attached to the surface of the detected metal workpiece, and the surface of the detected metal workpiece is coated with a coating;
receiving a reflected voltage signal detected by the piezoelectric ceramic sensor according to a preset first time interval, wherein the reflected voltage signal comprises a first reflected voltage signal of the detected metal workpiece and a second reflected voltage signal of the coating;
converting the reflected voltage signal into a first reflected waveform signal in digital form;
acquiring a second reflected wave signal most similar to the first reflected wave signal from a preset corresponding relation between the second reflected wave signal and the fitting degree;
and determining the attaching degree corresponding to the acquired second reflected wave signal as the attaching degree between the detected metal workpiece and the coating.
2. The method according to claim 1, wherein before the obtaining of the second reflected wave signal most similar to the first reflected wave signal from the preset correspondence between the second reflected wave signal and the degree of fitting, the method further comprises:
receiving a noise voltage signal collected by the piezoelectric ceramic sensor according to a preset second time interval, wherein the preset second time interval is greater than the preset first time interval;
and converting the noise voltage signal into a noise signal in a digital form, and if the size of the noise signal is smaller than a preset first threshold, executing the operation of acquiring a second reflected wave signal most similar to the first reflected wave signal from the corresponding relation between a preset second reflected wave signal and the fitting degree.
3. The method according to claim 1, wherein before the obtaining of the second reflected wave signal most similar to the first reflected wave signal from the preset correspondence between the second reflected wave signal and the degree of fitting, the method further comprises:
receiving the capacitance of the piezoelectric ceramic sensor sent by the piezoelectric ceramic sensor according to a preset third time interval, wherein the preset third time interval is greater than the preset first time interval;
and converting the capacitance into a capacitance in a digital form, and if the converted capacitance is a preset second threshold, performing the operation of obtaining a second reflected wave signal most similar to the first reflected wave signal from a preset correspondence between the second reflected wave signal and the degree of attachment.
4. An apparatus for detecting the degree of conformance between a metal workpiece and a coating, the apparatus comprising:
the detection module is used for detecting the detected metal workpiece through a piezoelectric ceramic sensor, a probe of the piezoelectric ceramic sensor is attached to the surface of the detected metal workpiece, and the surface of the detected metal workpiece is coated with a coating;
the receiving module is used for receiving reflected voltage signals collected by the piezoelectric ceramic sensor according to a preset first time interval, wherein the reflected voltage signals comprise a first reflected voltage signal of the detected metal workpiece and a second reflected voltage signal of the coating;
the conversion module is used for converting the reflected voltage signal into a first reflected waveform signal in a digital form;
the acquisition module is used for acquiring a second reflected wave signal which is most similar to the first reflected wave signal from the corresponding relation between a preset second reflected wave signal and the fitting degree;
and the determining module is used for determining the fit degree corresponding to the acquired second reflected wave signal as the fit degree between the detected metal workpiece and the coating.
5. The apparatus of claim 4, wherein the receiving module is further configured to receive the noise voltage signal collected by the piezoceramic sensor at a preset second time interval, where the preset second time interval is greater than the preset first time interval;
the conversion module is further used for converting the noise voltage signal into a noise signal in a digital form;
the obtaining module is configured to, if the size of the noise signal is smaller than a preset first threshold, perform an operation of obtaining a second reflected wave signal that is most similar to the first reflected wave signal from a correspondence between a preset second reflected wave signal and a degree of attachment.
6. The apparatus of claim 4, wherein the receiving module is further configured to receive the capacitance of the piezoceramic sensor sent by the piezoceramic sensor at a preset third time interval, and the preset third time interval is greater than the preset first time interval;
the conversion module is also used for converting the capacitance into the capacitance in a digital form;
and the obtaining module is used for obtaining a second reflected wave signal which is most similar to the first reflected wave signal from the corresponding relation between the preset second reflected wave signal and the fitting degree if the converted capacitance is a preset second threshold value.
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| 脉冲涡流无损检测技术综述;武新军 等;《仪器仪表学报》;20160831;第37卷(第8期);第1698-1712页 * |
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