Automatic adjustment method and device of ultrasonic flaw detection gate, storage medium and flaw detector

Abstract

The invention relates to an automatic adjustment method of an ultrasonic flaw detection gate, which is applied to a flaw detector and comprises the following steps: in the process of performing scanning flaw detection on a to-be-detected workpiece by using the flaw detector, determining the actual thickness of the to-be-detected workpiece based on an initial wave signal and a bottom wave signal obtained by scanning flaw detection of the flaw detector; calculating a bottom wave moment based on the actual thickness of the workpiece to be measured, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave signal; determining a bottom wave gate of the to-be-detected workpiece based on the bottom wave moment, and determining an initial wave gate of the to-be-detected workpiece based on the initial wave signal; and determining a target flaw detection gate of the to-be-detected workpiece based on the initial wave gate and the bottom wave gate. The problem that in the prior art, the measurement precision of a continuous variable-thickness workpiece in the ultrasonic scanning process cannot be guaranteed is solved.

Description

Technical Field

[0001] The present application relates to the field of ultrasonic testing technology, and in particular to an automatic adjustment method, device, storage medium and flaw detector for an ultrasonic flaw detection gate. Background Art

[0002] In recent years, automated ultrasonic testing technology has developed rapidly and has been widely used in the fields of aviation, aerospace, and national defense. In automated ultrasonic testing, non-contact ultrasonic pulse reflection method is often used, that is, the scanning device clamps the ultrasonic probe to transmit pulse waves to the inside of the workpiece to be tested, and the echo information between the surface and the bottom surface of the workpiece to be tested is collected through the data acquisition gate to complete ultrasonic scanning imaging. If continuous workpiece testing is encountered, such as complex curved workpieces such as aircraft engine blades and hubs, the acoustic time between the ultrasonic interface wave and the bottom surface wave will continue to change with the thickness of the measured point. If it relies on manual or conventional automated ultrasonic flaw detection equipment for testing, not only the detection accuracy cannot be effectively guaranteed, but it is also easy to cause defects to be missed, resulting in reduced product quality. Summary of the invention

[0003] The present application provides an automatic adjustment method, device, storage medium and flaw detector for an ultrasonic flaw detection gate, so as to solve the problem in the prior art that the measurement accuracy of a workpiece with continuously variable thickness cannot be guaranteed during ultrasonic scanning.

[0004] In a first aspect, the present application provides an automatic adjustment method for an ultrasonic flaw detection gate, which is applied to a flaw detector, and the method comprises: In the process of using the flaw detector to scan and detect flaws in the workpiece to be measured, determining the actual thickness of the workpiece to be measured based on the initial wave signal and the bottom wave signal obtained by the flaw detector during the scanning and flaw detection; Calculate the bottom wave moment based on the actual thickness of the workpiece to be measured, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave signal; Determining a bottom wave gate of the workpiece to be measured based on the bottom wave moment, and determining a starting wave gate of the workpiece to be measured based on the starting wave; A target flaw detection gate of the workpiece to be tested is determined based on the initial wave gate and the bottom wave gate.

[0005] In a second aspect, the present application provides an automatic adjustment device for an ultrasonic flaw detection gate, the device comprising: A data acquisition module, used to determine the actual thickness of the workpiece to be measured based on the initial wave signal and the bottom wave signal obtained by the flaw detector during the process of using the flaw detector to scan and detect the workpiece to be measured; A bottom wave calculation module, used to calculate the bottom wave moment based on the actual thickness of the workpiece to be measured, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave signal; an auxiliary gate calculation module, used to determine the bottom wave gate of the workpiece to be measured based on the bottom wave moment, and to determine the initial wave gate of the workpiece to be measured based on the initial wave; A target gate determination module is used to determine a target flaw detection gate of the workpiece to be tested based on the initial wave gate and the bottom wave gate.

[0006] In a third aspect, the present application provides a flaw detector, which uses the automatic adjustment method of the ultrasonic flaw detection gate as described in any one of claims 1 to 7 for flaw detection, and the flaw detector at least includes a flaw detection sensor, a signal processing module, a gate adjustment module, an alarm module, a control module and a power supply module; The flaw detection sensor is used to transmit and receive ultrasonic signals when flaw detection is performed on the workpiece to be tested; The signal processing module is used to convert the analog signal received by the flaw detection sensor into a digital signal to calculate the actual thickness of the workpiece to be tested; The control module is used to control the flaw detection sensor to transmit ultrasonic signals to the workpiece to be tested, and receive the workpiece data to be tested transmitted by the flaw detection sensor; it is also used to calculate the actual thickness of the workpiece to be tested based on the workpiece data to be tested, and compare the actual thickness with a preset thickness threshold to determine whether the workpiece to be tested is qualified, when the workpiece to be tested is a qualified workpiece, determine the target flaw detection gate of the workpiece to be tested according to the actual thickness, and send a gate adjustment signal to the gate adjustment module based on the target flaw detection gate, and when the workpiece to be tested is an unqualified workpiece, send an alarm control signal to the alarm module; The gate adjustment module is used to receive the gate adjustment signal of the control module and adjust the flaw detection gate based on the gate adjustment signal; The alarm module is used to receive the alarm control signal of the control module and send out an alarm signal based on the alarm control signal; The power module is used to provide power to the flaw detection sensor, signal processing module, gate adjustment module, alarm module and control module.

[0007] In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the automatic adjustment method of the ultrasonic flaw detection gate described in any one of the above items of the present application.

[0008] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: The method provided in the embodiment of the present application uses a flaw detector to scan and detect flaws on the workpiece to be measured. During the flaw detection process, the flaw detector transmits an ultrasonic signal to the workpiece to be measured, and receives the initial wave signal, bottom wave signal and defect wave signal formed by reflection from the surface, bottom surface and defects of the workpiece to be measured. The initial wave signal and bottom wave signal of the workpiece to be measured are obtained in real time to determine the actual thickness of the workpiece to be measured in real time. Then, according to the actual thickness of the workpiece to be measured, the bottom wave moment of the workpiece to be measured is calculated using a calculation formula of distance and speed, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave signal. The bottom wave moment is then used to determine the bottom wave gate of the workpiece to be measured. At the same time, the initial wave signal is used to determine the initial wave gate of the workpiece to be measured, and then the target flaw detection gate of the workpiece to be measured is determined according to the bottom wave gate and the initial wave gate. During flaw detection, the actual thickness of the workpiece to be measured is monitored in real time, and the corresponding bottom wave moment is calculated according to the actual thickness of the workpiece to be measured. The corresponding bottom wave gate is determined using the bottom wave moment, and then the target flaw detection gate is determined based on the bottom wave gate and the initial wave gate, ensuring that the bottom wave gate changes with the actual thickness of the workpiece to be measured, thereby ensuring that the target flaw detection gate changes with the actual thickness of the workpiece to be measured, thereby improving the accuracy of flaw detection on the workpiece to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0011] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0012] Figure 1 A structural schematic diagram of a flaw detector provided in an embodiment of the present application; Figure 2 A schematic diagram of a flow chart of an automatic adjustment method of an ultrasonic flaw detection gate provided in an embodiment of the present application; Figure 3 A schematic diagram of a flow chart of an automatic adjustment method of an ultrasonic flaw detection gate provided in an embodiment of the present application; Figure 4 An example schematic diagram of a flaw detection gate of an automatic adjustment method of an ultrasonic flaw detection gate provided in an embodiment of the present application Figure 5 A schematic diagram of a flow chart of an automatic adjustment method of an ultrasonic flaw detection gate provided in an embodiment of the present application; Figure 6 An example schematic diagram of a flaw detection gate in an automatic adjustment method of an ultrasonic flaw detection gate provided in an embodiment of the present application; Figure 7 A schematic diagram of the structure of an automatic adjustment device for an ultrasonic flaw detection gate provided in an embodiment of the present application. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0014] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0015] In order to solve the technical problem in the prior art that the measurement accuracy of workpieces with continuously variable thickness cannot be guaranteed during ultrasonic scanning, the present application provides an automatic adjustment method for an ultrasonic flaw detection gate, which can improve the flaw detection accuracy of workpieces with continuously variable thickness.

[0016] like Figure 1As shown, a flaw detector is provided for an embodiment of the present application, and the flaw detector at least includes a flaw detection sensor, a signal processing module, a gate adjustment module, an alarm module, a control module and a power supply module; the flaw detection sensor is used to transmit and receive ultrasonic signals when performing flaw detection on a workpiece to be detected; the signal processing module is used to convert the analog signal received by the flaw detection sensor into a digital signal to calculate the actual thickness of the workpiece to be detected; the control module is used to control the flaw detection sensor to transmit ultrasonic signals to the workpiece to be detected, and receive the workpiece data to be detected transmitted by the flaw detection sensor; and is also used to calculate the actual thickness of the workpiece to be detected based on the workpiece data to be detected, and compare the actual thickness with a preset thickness threshold The values ​​are compared to determine whether the workpiece to be tested is qualified. When the workpiece to be tested is qualified, the target flaw detection gate of the workpiece to be tested is determined according to the actual thickness, and a gate adjustment signal is sent to the gate adjustment module based on the target flaw detection gate. When the workpiece to be tested is unqualified, an alarm control signal is sent to the alarm module; the gate adjustment module is used to receive the gate adjustment signal of the control module, and adjust the flaw detection gate based on the gate adjustment signal; the alarm module is used to receive the alarm control signal of the control module and send an alarm signal based on the alarm control signal; the power supply module is used to provide power to the flaw detection sensor, the signal processing module, the gate adjustment module, the alarm module and the control module.

[0017] In the process of using the flaw detector to scan and detect flaws on the workpiece to be tested, the flaw detection sensor is controlled by the control module to transmit an ultrasonic signal to the workpiece to be tested, and the flaw detection sensor receives the reflection signal of the flaw detection signal in the workpiece to be tested, the reflection signal includes the initial wave signal reflected on the surface of the workpiece to be tested and the bottom wave signal reflected on the bottom surface of the workpiece to be tested. When there is a defect in the workpiece to be tested, the reflection signal also includes the defect wave signal reflected by the defect inside the workpiece to be tested. The flaw detection sensor transmits the received reflection signal to the control module, and the control module determines the actual thickness of the workpiece to be tested by calculating the time difference between the initial wave signal and the bottom wave signal. The control module compares the actual thickness with a pre-stored preset thickness threshold. The preset thickness threshold is the thickness interval of the workpiece to be tested that belongs to a qualified workpiece. When the actual thickness is less than or equal to the preset thickness threshold, it indicates that the workpiece to be tested is a qualified workpiece. At this time, the time corresponding to the maximum amplitude point of the bottom wave is calculated according to the actual thickness of the workpiece to be tested. That is, the time corresponding to the maximum amplitude point of the bottom wave is calculated by the actual thickness of the workpiece to be measured and the propagation speed of the ultrasonic wave in the workpiece to be measured, and the time is determined as the bottom wave moment, and then the two end points of the bottom wave gate are calculated according to the bottom wave moment combined with the system characteristic time, and the initial wave gate of the workpiece to be measured is determined according to the initial wave signal, and the flaw detection gate of the workpiece to be measured is determined according to the initial wave gate and the bottom wave gate. The control module generates a corresponding gate adjustment signal according to the flaw detection gate, and sends the gate adjustment signal to the gate adjustment module. The gate adjustment module adjusts the flaw detection gate of the workpiece to be measured to the target flaw detection gate according to the gate adjustment signal, so as to obtain the signal in the target flaw detection gate to determine whether the workpiece to be measured has defects; when the actual thickness of the workpiece to be measured is greater than the preset thickness threshold, it indicates that the workpiece to be measured is an unqualified workpiece. At this time, an alarm control signal is generated and the alarm control signal is sent to the alarm module to control the alarm module to send an alarm signal to remind the operator.

[0018] In the embodiment of the present application, the signal transmission between the control module and the flaw detection sensor and the gate adjustment module is converted into a signal form that can be received and recognized by each receiving end through the signal processing module.

[0019] In an embodiment of the present application, the flaw detector may also include a positioning sensor for positioning the workpiece to be measured, a track motor for driving the flaw detector sensor to automatically move on the workpiece to be measured, an encoder for detecting the length of the workpiece to be measured, and the like. The positioning sensor, the track motor, the encoder, and the like are all connected to the control module, and the control module controls the track motor to rotate and drive the flaw detector to move on the workpiece to be measured, thereby realizing automatic scanning of the workpiece to be measured; in the process of the control module controlling the flaw detector sensor to perform flaw detection scanning on the workpiece to be measured, the defects in the workpiece to be measured can also be located by combining the time of the defect wave determined by the positioning sensor and the target flaw detection gate, so that the positioning of the defects in the workpiece to be measured is more accurate.

[0020] Figure 2 The following is a flow chart of an automatic adjustment method of an ultrasonic flaw detection gate provided in an embodiment of the present application. Figure 2 As shown, the method comprises at least the following steps: S101, in the process of using the flaw detector to scan and detect flaws on the workpiece to be measured, determining the actual thickness of the workpiece to be measured based on the initial wave signal and the bottom wave signal obtained by the flaw detector during the scanning and flaw detection.

[0021] In an embodiment of the present application, during the process of using a flaw detector to scan and detect flaws in a workpiece to be tested, the flaw detector transmits an ultrasonic signal for flaw detection to the workpiece to be tested, and the ultrasonic signal will be reflected on the surface and bottom surface of the workpiece to be tested to form an initial wave signal and a bottom wave signal corresponding to the workpiece to be tested. When there are defects inside the workpiece to be tested, the ultrasonic signal emitted by the flaw detector will also be reflected at the defect to form a corresponding defect wave signal. The actual thickness of the workpiece to be tested can be determined by calculating the time difference between the initial wave signal and the bottom wave signal in real time.

[0022] like Figure 2 As shown, after calculating the actual thickness of the workpiece to be measured, the actual thickness of the workpiece to be measured can be compared with the thickness requirement corresponding to the qualified workpiece to determine whether the workpiece to be measured is a qualified workpiece, thereby avoiding the time spent on scanning and flaw detection of unqualified workpieces. The specific implementation method may include the following steps: S1011, comparing the actual thickness of the workpiece to be measured with a preset thickness threshold, S1012, if the actual thickness is less than or equal to the preset thickness threshold, executing the step of calculating the bottom wave moment based on the actual thickness of the workpiece to be measured; S1013, if the actual thickness is greater than the preset thickness threshold, stopping the scanning and flaw detection of the workpiece to be measured, and issuing an alarm signal. The preset thickness threshold is the normal thickness interval of a qualified workpiece, and different workpieces to be measured have different preset thickness thresholds. By comparing the actual thickness of the workpiece to be measured with the preset threshold, when the actual thickness is greater than the preset thickness threshold, it indicates that the current workpiece to be measured is an unqualified workpiece. At this time, an alarm signal is issued to the flaw detection management personnel to remind the management personnel that there is no need to continue the flaw detection operation of the workpiece to be measured, and the workpiece to be measured is subjected to secondary processing or discarded. When the actual thickness of the workpiece to be measured is less than or equal to the preset thickness threshold, it indicates that the current workpiece to be measured is a qualified workpiece in terms of size, and it is necessary to determine whether there are defects in the workpiece to be measured by scanning and flaw detection to determine whether the workpiece to be measured is qualified. Therefore, when the actual thickness of the workpiece to be measured is less than or equal to the preset thickness threshold, the bottom wave moment of the workpiece to be measured is calculated and determined based on the actual thickness value.

[0023] S102, calculating the bottom wave moment based on the actual thickness of the workpiece to be measured, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave signal.

[0024] In the embodiment of the present application, under the condition that the actual thickness of the workpiece to be measured and the propagation speed of the ultrasonic wave in the workpiece to be measured are known, the bottom wave moment is calculated by the distance formula. The bottom wave moment represents the time corresponding to the highest point of the bottom wave amplitude.

[0025] like Figure 3 As shown, in one achievable manner, it includes S1021, using the propagation speed of the ultrasonic wave in the workpiece to be measured and the actual thickness of the workpiece to be measured to calculate the bottom wave moment. For example, the bottom wave moment calculation formula is: S=V*(T / 2), where S is the actual thickness of the workpiece to be measured, and V is the propagation speed of the ultrasonic wave in the workpiece to be measured. Since the actual thickness of the workpiece to be measured is calculated by the time when the ultrasonic wave is emitted from the flaw detector and received after the bottom wave of the workpiece to be measured is reflected, the bottom wave moment is 1 / 2 of the time when the flaw detector receives the bottom wave signal.

[0026] The bottom wave signal refers to the ultrasonic signal reflected from the bottom or bottom layer of the object to be inspected. By analyzing the bottom wave, it can also be determined whether the object to be inspected has defects.

[0027] S103, determining a bottom wave gate of the workpiece to be measured based on the bottom wave moment, and determining a start wave gate of the workpiece to be measured based on the start wave signal.

[0028] In the embodiment of the present application, after calculating the bottom wave moment, the bottom wave gate can be determined by the bottom wave moment, and the initial wave gate can be determined based on the initial wave, thereby eliminating the influence of the bottom wave gate and the initial wave gate on the analysis of whether the workpiece to be tested has defects.

[0029] like Figure 3 As shown, in an achievable method, the method for determining the bottom wave gate may include the following steps: S1031, obtaining the system characteristic time; S1032, using the system characteristic time and the bottom wave moment to calculate the bottom wave gate of the workpiece to be measured; wherein, T=2NS / V, S is the actual thickness of the workpiece to be measured, N is the Nth bottom wave signal, V is the propagation speed of the ultrasonic wave in the workpiece to be measured, and T is the bottom wave moment corresponding to the Nth bottom wave signal.

[0030] In an embodiment of the present application, by obtaining the system characteristic time, the system characteristic time refers to the time required for the flaw detector to receive the ultrasonic signal, process, analyze and display the results. The bottom wave gate is calculated by the system characteristic time and the bottom wave moment, and the width of the bottom wave is determined using the system characteristic time and the bottom wave moment, so that the time corresponding to the bottom wave signal can be located more accurately.

[0031] The bottom wave moment of the bottom wave signal is calculated using the actual thickness of the workpiece to be measured and the propagation speed of the ultrasonic wave in the workpiece to be measured. The bottom wave moment calculation formula is:

[0032] Wherein, S is the actual thickness of the workpiece to be measured, N is the Nth bottom wave, V is the propagation speed of the ultrasonic wave in the workpiece to be measured, and T is the bottom wave moment corresponding to the Nth bottom wave.

[0033] In the embodiment of the present application, the flaw detection gate of the workpiece to be tested is determined by combining the initial wave signal and the bottom wave signal of the workpiece to be tested, and in order to avoid interference caused by the bottom wave signal, the bottom wave signal needs to be excluded, so the bottom wave signal is the first bottom wave signal, and N is 1, that is, in the embodiment of the present application, the calculation formula of the bottom wave moment is:

[0034] The bottom wave moment is calculated by the above formula, and then the bottom wave gate is calculated using the bottom wave moment and system characteristic time.

[0035] The calculation formula for the bottom wave start time and bottom wave end time of the bottom wave gate is: Bottom wave time - system characteristic time = bottom wave start time; Bottom wave time + system characteristic time = bottom wave end time.

[0036] The bottom wave gate is determined by the bottom wave moment and the system characteristic time, thereby eliminating the influence of the signal within the bottom wave gate width on the analysis of whether there are defects inside the workpiece to be tested.

[0037] like Figure 3 As shown, the method for determining the starting wave gate includes the following steps: S1033, comparing the heights of the rising edge and the falling edge of the starting wave signal with a preset height threshold; S1034, determining the time corresponding to the rising edge being greater than or equal to the preset height threshold as the starting time of the starting wave of the starting wave gate, S1035, determining the time corresponding to the falling edge being less than or equal to the preset height threshold as the ending time of the starting wave of the starting wave gate.

[0038] In an embodiment of the present application, the starting wave signal includes a rising edge and a falling edge. The purpose of comparing the rising edge and the falling edge of the starting wave signal with the preset height threshold is to obtain a valid starting wave signal. Therefore, after obtaining the starting wave signal, the highest amplitude point corresponding to the starting wave signal is first determined. The preset height threshold is set according to the high speed of the highest amplitude point. When the height of the rising edge of the starting wave signal is greater than or equal to the preset height threshold, it indicates that the current signal is a valid starting wave signal, and the time corresponding to the height being greater than or equal to the preset height threshold is determined as the starting time of the starting wave of the starting wave gate. When the height of the falling edge of the starting wave signal is less than or equal to the preset height threshold, it indicates that the current signal is a valid starting wave signal, and the time corresponding to the height of the falling edge of the starting wave signal being less than or equal to the preset height threshold is determined as the ending time of the starting wave. The time corresponding to the valid starting wave signal is determined by comparing the height of the starting wave signal with the preset height threshold, thereby eliminating the influence of the valid starting wave signal on the scanning and flaw detection of the workpiece to be measured.

[0039] S104, determining a target flaw detection gate of the workpiece to be tested based on the initial wave gate and the bottom wave gate.

[0040] In the embodiments of the present application, Figure 3 As shown, the method for determining the target flaw detection gate may include the following steps: S1041, determining the end time of the initial wave of the initial wave gate as the start time of the flaw detection of the target flaw detection gate of the workpiece to be tested; S1042, determining the start time of the bottom wave of the bottom wave gate as the end time of the flaw detection of the target flaw detection gate of the workpiece to be tested.

[0041] The starting time and ending time of the initial wave of the initial wave gate, as well as the starting time and ending time of the bottom wave of the bottom wave gate are determined by calculation. The target flaw detection gate is between the initial wave gate and the bottom wave gate. The starting time of the initial wave gate is used as the flaw detection starting time of the target flaw detection gate, and the bottom wave starting time of the bottom wave gate is used as the flaw detection ending time of the target flaw detection gate. The initial wave signal in the initial wave gate and the bottom wave signal in the bottom wave gate are excluded from affecting the defect analysis of the workpiece to be tested.

[0042] The two ends of the target flaw detection gate are the end time of the initial wave and the beginning time of the bottom wave. When analyzing the signal in the target flaw detection gate, the appearance of the initial wave signal and the bottom wave signal is avoided, thereby improving the accuracy of scanning the defects inside the workpiece to be tested.

[0043] One possible way to do this is Figure 4As shown, in the figure, the bottom wave moment of the bottom wave signal is represented as TT1 by calculation, the initial wave signal is represented by a regular signal wave, and in order to cover the initial wave signal in the initial wave gate, the width of the initial wave gate is greater than the width of the initial wave signal. In the specific implementation process, the initial wave signal is usually a parabola. Therefore, the corresponding initial wave start moment and initial wave end moment are determined by comparing the rising edge and the falling edge with the preset height threshold. In the figure, the initial wave start moment is T0, and the initial wave end moment is T1, that is, the initial wave gate is T0-T1; at the same time, the system characteristic time is set to tt0, and the bottom wave start time and bottom wave end time corresponding to the bottom wave are determined by calculating the bottom wave moment and the system characteristic time tt0, that is, the bottom wave start time is TT1-tt0, represented as T2 in the figure, and the bottom wave end time is TT1+tt0, represented as T3 in the figure, that is, the bottom wave gate is T2-T3. The end time T1 of the initial wave and the start time T2 of the bottom wave are determined as the two ends of the flaw detection gate, that is, the flaw detection gate is T1-T2. During the flaw detection process, the signal between T1-T2 is obtained for analysis to determine whether the workpiece to be tested has defects. The way to analyze whether there is a defect is to obtain whether there is a change in the signal wave between T1-T2.

[0044] In an embodiment of the present application, when a flaw detector is used to detect flaws in a workpiece to be measured, the actual thickness of the workpiece to be measured is determined by using the initial wave signal and the bottom wave signal corresponding to the workpiece to be measured, and then the height of the rising edge and the height of the falling edge of the initial wave signal are compared with a preset height threshold, so as to determine the initial wave gate corresponding to the initial wave signal, and the initial wave signal in the initial wave gate is a valid initial wave signal. At the same time, the relationship between the distance, the speed and the time is calculated using the relationship between the distance, the speed and the time, and the time of this point is determined as the bottom wave moment, and then the bottom wave gate is calculated using the system characteristic time and the bottom wave moment, and the bottom wave signal in the bottom wave gate is a valid bottom wave signal, and the initial wave start time of the initial wave gate is determined as the flaw detection start time of the flaw detection gate, and the bottom wave start time of the bottom wave gate is determined as the flaw detection end time of the target flaw detection gate, that is, the initial wave end time and the bottom wave start time are determined as the two end points of the target flaw detection gate, and the signal in the target flaw detection gate is obtained for analysis to determine whether the workpiece to be measured has defects. During the flaw detection process, the bottom wave moment changes with the actual thickness of the workpiece to be tested, so that the target flaw detection gate changes with the actual thickness of the workpiece to be tested, ensuring that the target flaw detection gate always corresponds to the actual thickness of the workpiece to be tested during the flaw detection process, thereby improving the accuracy of scanning and flaw detection of the workpiece to be tested; at the same time, the setting of the initial wave gate and the bottom wave gate eliminates the influence of the initial wave signal and the bottom wave signal, further improving the accuracy of scanning and flaw detection of the internal defects of the workpiece to be tested. After determining the actual thickness of the workpiece to be tested, the actual thickness is compared with the preset thickness threshold to determine whether the workpiece to be tested is a qualified workpiece. When the workpiece to be tested is a qualified workpiece, the target flaw detection gate is determined and adjusted for the workpiece to be tested. When the workpiece to be tested is an unqualified workpiece, the scanning and flaw detection of the workpiece to be tested is stopped, and an alarm signal is issued to remind the staff that the workpiece to be tested that is currently being scanned and flaw detected by the flaw detector is an unqualified workpiece.

[0045] Figure 5 The present invention provides a flow chart of an automatic adjustment method of an ultrasonic flaw detection gate. Figure 5 As shown, the method comprises at least the following steps: S201, obtaining the actual thickness and initial wave signal of the workpiece to be measured.

[0046] The specific implementation of this step can refer to step S101 and will not be described in detail here.

[0047] S202, calculating the bottom wave moment based on the actual thickness of the workpiece to be measured, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave.

[0048] The specific implementation of this step can refer to step S102 and will not be described in detail here.

[0049] S203, determining a bottom wave gate of the workpiece to be measured based on the bottom wave moment, and determining a start wave gate of the workpiece to be measured based on the start wave signal.

[0050] The specific implementation of this step can refer to step S103 and will not be described in detail here.

[0051] S204, determining a flaw detection gate of the workpiece to be tested based on the initial wave gate and the initial wave gate.

[0052] The specific implementation of this step can refer to step S104 and will not be described in detail here.

[0053] S205, obtaining the bottom wave moments of at least two adjacent bottom waves of the workpiece to be measured.

[0054] In an embodiment of the present application, during the flaw detection process of the workpiece to be measured, multiple bottom waves may be received. When multiple bottom waves are received, the bottom wave moment corresponding to each bottom wave is calculated using the propagation speed of ultrasonic waves in the workpiece to be measured and the actual thickness of the workpiece to be measured. The flaw detection gate can be determined by the bottom wave gate between two adjacent bottom waves, thereby obtaining the bottom wave moments corresponding to at least two adjacent bottom waves.

[0055] Multiple bottom waves correspond to the multiple reflections of ultrasonic waves in the workpiece to be measured, so the bottom wave moment calculation formula is:

[0056] Wherein, S is the actual thickness of the workpiece to be measured, N is the Nth bottom wave, V is the propagation speed of the ultrasonic wave in the workpiece to be measured, and T is the bottom wave moment corresponding to the Nth bottom wave.

[0057] like Figure 4 and Figure 6 As shown, three bottom waves are received, namely, the first bottom wave, the second bottom wave, and the third bottom wave. The bottom wave time corresponding to the first bottom wave is TT1, the bottom wave time corresponding to the second bottom wave is TT2, and the bottom wave time corresponding to the third bottom wave is TT3. TT1, TT2, and TT3 are calculated respectively using the above bottom wave time calculation formula.

[0058] S206, determining each bottom wave gate based on the system characteristic time and each bottom wave moment.

[0059] In the embodiment of the present application, the bottom wave start time and the bottom wave end time of the bottom wave gate corresponding to each bottom wave are obtained by calculating the bottom wave moment corresponding to each bottom wave and the system characteristic time.

[0060] like Figure 4 and Figure 6As shown, the preset system characteristic time is tt0, the bottom wave moment of the primary bottom wave calculated in the above step S205 is TT1, and the bottom wave moment of the secondary bottom wave is TT2. Then, the bottom wave start moment of the bottom wave gate corresponding to the primary bottom wave is TT1-tt0, and the bottom wave end moment of the bottom wave gate corresponding to the primary bottom wave is TT1+tt0, which is expressed as T2-T3 in the diagram, i.e., the bottom wave gate corresponding to the primary bottom wave is T2-T3; the bottom wave start moment of the bottom wave gate corresponding to the secondary bottom wave is TT2-tt0, and the bottom wave end moment of the bottom wave gate corresponding to the secondary bottom wave is TT2+tt0, which is expressed as T4-T5 in the diagram, i.e., the bottom wave gate corresponding to the primary bottom wave is T4-T5.

[0061] S207, determining a second flaw detection gate of the workpiece to be tested based on two adjacent bottom wave gates.

[0062] In the embodiment of the present application, the second flaw detection gate is set between two bottom waves, and the bottom wave end time of the previous bottom wave can be determined as the start time of the second flaw detection gate, and the bottom wave start time of the next bottom wave can be determined as the end time of the second flaw detection gate, thereby ensuring that the signal in the second flaw detection gate does not contain the bottom wave signal, eliminating the influence of the bottom wave signal on the defect analysis. At the same time, the second flaw detection gate and the target flaw detection gate can form a mutual verification relationship, and the signal analysis in the second flaw detection gate can be used to further determine whether there is a defect inside the workpiece to be tested.

[0063] like Figure 4 and Figure 6 As shown, in the above step 206, the bottom wave gate of the primary bottom wave is determined to be T2-T3, and the bottom wave gate of the secondary bottom wave is determined to be T4-T5. At this time, T3-T4 can be determined as the second flaw detection gate for scanning and flaw detection, thereby improving the accuracy of flaw detection of the workpiece to be tested.

[0064] In an embodiment of the present application, when multiple bottom waves are received during the flaw detection process, the bottom wave moment corresponding to each bottom wave can be calculated according to the actual thickness of the workpiece to be measured, and then the bottom wave gate corresponding to each bottom wave is determined respectively, and the time between two adjacent bottom waves is set as the second flaw detection gate, that is, the bottom wave end moment of the previous bottom wave gate is determined as the flaw detection start moment of the second flaw detection gate, and the bottom wave start moment of the next bottom wave gate is determined as the flaw detection end moment of the second flaw detection gate, so as to obtain the signal between the two bottom waves to analyze and determine whether there is a defect in the workpiece to be measured, and at the same time eliminate the influence of each bottom wave signal on the defect analysis, thereby improving the accuracy of defect scanning inside the workpiece to be measured.

[0065] like Figure 7 As shown, the present application embodiment provides a schematic diagram of the structure of an automatic adjustment device for an ultrasonic flaw detection gate. Figure 7 As shown, the device comprises: A data acquisition module is used to determine the actual thickness of the workpiece to be measured based on the initial wave signal and the bottom wave signal obtained by the flaw detector during the process of using the flaw detector to scan and detect the workpiece to be measured; A bottom wave calculation module, used to calculate the bottom wave moment based on the actual thickness of the workpiece to be measured, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave signal; an auxiliary gate calculation module, used to determine the bottom wave gate of the workpiece to be measured based on the bottom wave moment, and to determine the initial wave gate of the workpiece to be measured based on the initial wave signal; A target gate determination module is used to determine a target flaw detection gate of the workpiece to be tested based on the initial wave gate and the bottom wave gate.

[0066] Furthermore, the device also includes: A thickness comparison module, used for comparing the actual thickness of the workpiece to be measured with a preset thickness threshold; A flaw detection start module, configured to execute the step of calculating the bottom wave moment based on the actual thickness of the workpiece to be tested if the actual thickness is less than or equal to a preset thickness threshold; The flaw detection stopping module is used to stop scanning and flaw detection of the workpiece to be tested and send out an alarm signal if the actual thickness is greater than a preset thickness threshold.

[0067] Further, the bottom wave calculation module includes: The bottom wave calculation unit is used to calculate the bottom wave moment by using the propagation speed of the ultrasonic wave in the workpiece to be measured and the actual thickness of the workpiece to be measured.

[0068] Furthermore, the auxiliary gate calculation module includes: A system time acquisition unit, used to acquire system characteristic time; A bottom wave gate determination unit is used to calculate the bottom wave gate of the workpiece to be measured by using the system characteristic time and the bottom wave moment.

[0069] Furthermore, the auxiliary gate calculation module also includes: A height comparison unit, used for comparing the heights of the rising edge and the falling edge of the initial wave signal with a preset height threshold; A start wave start determination unit, used to determine the time corresponding to the height of the rising edge being greater than or equal to a preset height threshold as the start wave start time of the start wave gate; The start-wave end determination unit is used to determine the time corresponding to the height of the falling edge being less than or equal to a preset height threshold as the start-wave end time of the start-wave gate.

[0070] Further, the target gate determination module includes: A flaw detection start determination unit, used to determine the end time of the initial wave of the initial wave gate as the flaw detection start time of the target flaw detection gate of the workpiece to be detected; The flaw detection end determination unit is used to determine the bottom wave start time of the bottom wave gate as the flaw detection end time of the target flaw detection gate of the workpiece to be detected.

[0071] Furthermore, the device also includes: A multiple bottom wave acquisition module is used to acquire the bottom wave moments of at least two adjacent bottom waves of the workpiece to be measured; A bottom wave gate determination module, used for determining each bottom wave gate based on the system characteristic time and each bottom wave moment; The second gate determination module is used to determine the second flaw detection gate of the workpiece to be tested based on two adjacent bottom wave gates.

[0072] In an embodiment of the present application, when a flaw detector is used to detect flaws in a workpiece to be measured, the actual thickness of the workpiece to be measured is determined by using the initial wave signal and the bottom wave signal corresponding to the workpiece to be measured, and then the height of the rising edge and the height of the falling edge of the initial wave signal are compared with a preset height threshold, so as to determine the initial wave gate corresponding to the initial wave signal, and the initial wave signal in the initial wave gate is a valid initial wave signal. At the same time, the relationship between the distance, the speed and the time is calculated using the relationship between the distance, the speed and the time, and the time of this point is determined as the bottom wave moment, and then the bottom wave gate is calculated using the system characteristic time and the bottom wave moment, and the bottom wave signal in the bottom wave gate is a valid bottom wave signal, and the initial wave start time of the initial wave gate is determined as the flaw detection start time of the flaw detection gate, and the bottom wave start time of the bottom wave gate is determined as the flaw detection end time of the target flaw detection gate, that is, the initial wave end time and the bottom wave start time are determined as the two end points of the target flaw detection gate, and the signal in the target flaw detection gate is obtained for analysis to determine whether the workpiece to be measured has defects. During the flaw detection process, the bottom wave moment changes with the actual thickness of the workpiece to be tested, so that the target flaw detection gate changes with the actual thickness of the workpiece to be tested, ensuring that the target flaw detection gate always corresponds to the actual thickness of the workpiece to be tested during the flaw detection process, thereby improving the accuracy of scanning and flaw detection of the workpiece to be tested; at the same time, the setting of the initial wave gate and the bottom wave gate eliminates the influence of the initial wave signal and the bottom wave signal, further improving the accuracy of scanning and flaw detection of the internal defects of the workpiece to be tested. After determining the actual thickness of the workpiece to be tested, the actual thickness is compared with the preset thickness threshold to determine whether the workpiece to be tested is a qualified workpiece. When the workpiece to be tested is a qualified workpiece, the target flaw detection gate is determined and adjusted for the workpiece to be tested. When the workpiece to be tested is an unqualified workpiece, the scanning and flaw detection of the workpiece to be tested is stopped, and an alarm signal is issued to remind the staff that the workpiece to be tested that is currently being scanned and flaw detected by the flaw detector is an unqualified workpiece.

[0073] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method for automatically adjusting an ultrasonic flaw detection gate provided in any of the aforementioned method embodiments are implemented.

[0074] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0075] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution, in essence, or the part that contributes to the relevant technology, can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0076] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0077] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for automatically adjusting an ultrasonic flaw detection gate, characterized in that: Applied to a flaw detector, the method comprises: In the process of using the flaw detector to scan and detect flaws in the workpiece to be measured, determining the actual thickness of the workpiece to be measured based on the initial wave signal and the bottom wave signal obtained by the flaw detector during the scanning and flaw detection; Calculate the bottom wave moment based on the actual thickness of the workpiece to be measured, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave signal; Determining a bottom wave gate of the workpiece to be measured based on the bottom wave moment, and determining a start wave gate of the workpiece to be measured based on the start wave signal; A target flaw detection gate of the workpiece to be tested is determined based on the initial wave gate and the bottom wave gate.

2. The method according to claim 1, characterized in that Before calculating the bottom wave time based on the actual thickness of the workpiece to be measured, the method further includes: Comparing the actual thickness of the workpiece to be measured with a preset thickness threshold; If the actual thickness is less than or equal to the preset thickness threshold, the step of calculating the bottom wave moment based on the actual thickness of the workpiece to be measured is performed; If the actual thickness is greater than the preset thickness threshold, the scanning and flaw detection of the workpiece to be tested is stopped and an alarm signal is issued.

3. The method according to claim 1, characterized in that The step of calculating the bottom wave moment based on the actual thickness of the workpiece to be measured comprises: Calculating the bottom wave moment by using the propagation speed of the ultrasonic wave in the workpiece to be measured and the actual thickness of the workpiece to be measured; Wherein, T=2NS / V, S is the actual thickness of the workpiece to be measured, N is the Nth bottom wave signal, V is the propagation speed of the ultrasonic wave in the workpiece to be measured, and T is the bottom wave moment corresponding to the Nth bottom wave signal.

4. The method according to claim 3, characterized in that The method of determining the bottom wave gate of the workpiece to be measured based on the bottom wave moment includes: Get system characteristic time; The bottom wave gate of the workpiece to be measured is calculated using the system characteristic time and the bottom wave moment.

5. The method according to claim 4, characterized in that The method of determining the initial wave gate of the workpiece to be measured based on the initial wave signal comprises: Comparing the heights of the rising edge and the falling edge of the initial wave signal with a preset height threshold; The time corresponding to when the height of the rising edge is greater than or equal to the preset height threshold is determined as the start time of the initial wave of the initial wave gate; The time when the height of the falling edge is less than or equal to the preset height threshold is determined as the start wave end time of the start wave gate.

6. The method according to claim 1, characterized in that The step of combining the initial wave gate and the bottom wave gate to determine the target flaw detection gate of the workpiece to be tested includes: Determine the end time of the initial wave of the initial wave gate as the start time of flaw detection of the target flaw detection gate of the workpiece to be detected; The bottom wave start time of the bottom wave gate is determined as the flaw detection end time of the target flaw detection gate of the workpiece to be detected.

7. The method according to claim 1, characterized in that The method further comprises: Acquire the bottom wave moments of at least two adjacent bottom waves of the workpiece to be measured; Determining each bottom wave gate based on the system characteristic time and each bottom wave moment; A second flaw detection gate of the workpiece to be tested is determined based on two adjacent bottom wave gates.

8. An automatic adjustment device for an ultrasonic flaw detection gate, characterized in that: The device comprises: A data acquisition module, used for determining the actual thickness of the workpiece to be measured based on the initial wave signal and the bottom wave signal obtained by the flaw detector during the process of using the flaw detector to scan and detect the workpiece to be measured; A bottom wave calculation module, used to calculate the bottom wave moment based on the actual thickness of the workpiece to be measured, wherein the bottom wave moment is the time corresponding to the maximum amplitude point of the bottom wave signal; an auxiliary gate calculation module, used to determine the bottom wave gate of the workpiece to be measured based on the bottom wave moment, and to determine the initial wave gate of the workpiece to be measured based on the initial wave signal; A target gate determination module is used to determine a target flaw detection gate of the workpiece to be tested based on the initial wave gate and the bottom wave gate.

9. A flaw detector, characterized in that: The flaw detector is performed using the automatic adjustment method of the ultrasonic flaw detection gate as described in any one of claims 1 to 7, wherein the flaw detector comprises at least a flaw detection sensor, a signal processing module, a gate adjustment module, an alarm module, a control module and a power supply module; The flaw detection sensor is used to transmit and receive ultrasonic signals when flaw detection is performed on the workpiece to be tested; The signal processing module is used to convert the analog signal received by the flaw detection sensor into a digital signal to calculate the actual thickness of the workpiece to be tested; The control module is used to control the flaw detection sensor to transmit ultrasonic signals to the workpiece to be tested, and receive the workpiece data to be tested transmitted by the flaw detection sensor; it is also used to calculate the actual thickness of the workpiece to be tested based on the workpiece data to be tested, and compare the actual thickness with a preset thickness threshold to determine whether the workpiece to be tested is qualified, when the workpiece to be tested is a qualified workpiece, determine the target flaw detection gate of the workpiece to be tested according to the actual thickness, and send a gate adjustment signal to the gate adjustment module based on the target flaw detection gate, and when the workpiece to be tested is an unqualified workpiece, send an alarm control signal to the alarm module; The gate adjustment module is used to receive the gate adjustment signal of the control module and adjust the flaw detection gate based on the gate adjustment signal; The alarm module is used to receive the alarm control signal of the control module and send out an alarm signal based on the alarm control signal; The power module is used to provide power to the flaw detection sensor, signal processing module, gate adjustment module, alarm module and control module.

10. A storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the automatic adjustment method of the ultrasonic flaw detection gate described in any one of claims 1 to 7 of the present application.

Images