Method, device, equipment, medium and product for detecting thickness of heat treatment hardened layer

Abstract

The application discloses a heat treatment hardened layer thickness detection method, device, equipment, medium and product, relates to the engineering nondestructive testing technical field, and the method comprises the following steps: gradually increasing the probe spacing, and monitoring the waveform characteristics of the reflected signal, taking the distortion of the reflected signal as the basis, determining the corresponding probe spacing interval; the probe spacing interval is refined by dichotomy to obtain the probe spacing interval mean; the first peak position time of the direct signal and the second peak position time of the reflected signal are obtained when the probe spacing is in the probe spacing interval mean; the heat treatment hardened layer thickness is determined based on a specific angle, the first peak position time, the second peak position time, the probe spacing interval mean and the sound velocity; the double-probe arrangement mode of one transmitting and one receiving is combined with the ultrasonic diffraction time difference method, the sound path difference between the surface direct signal and the reflected signal is analyzed to calculate the thickness, the technical limitation of the traditional single probe is got rid of, and the application range of the nondestructive testing is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of engineering nondestructive testing, and particularly relates to a heat treatment hardened layer thickness detection method, device, equipment, medium and product. BACKGROUND

[0002] Heat treatment is a process of heating, holding and cooling a workpiece in the field of mechanical manufacturing. By changing the microstructure inside the workpiece, the mechanical properties of the material are adjusted to make the workpiece have good hardness and wear resistance, and the strength and load capacity of the material are improved. Therefore, detecting the heat treatment hardened layer thickness is an important link for measuring the heat treatment quality and ensuring the performance of the workpiece.

[0003] For the key components such as track link blocks and supporting wheels of the chassis of a tracked engineering machine, nondestructive detection of the heat treatment hardened layer thickness can improve the detection efficiency of the heat treatment hardened layer thickness and reduce the cost of manual destructive testing. Among them, eddy current detection and ultrasonic detection are the most commonly used methods for detecting the thickness of heterogeneous materials, but they are limited by the conductivity requirements of the measured object and the skin effect, which results in that the eddy current nondestructive detection of the hardened layer thickness is usually less than 10 mm. Ultrasonic A-scan detection is a commonly used ultrasonic detection technology. By using critical refraction longitudinal waves (LCR) and interface reflection transverse waves, a single ultrasonic probe is used to calculate the heat treatment hardened layer thickness. However, LCR waves and Rayleigh / surface waves are usually used to detect defects in plates, and the waveforms usually propagate on the surface. In addition, the energy of the transverse wave attenuates greatly, and the detection depth is small. Therefore, the traditional detection method of the heat treatment hardened layer thickness has obvious limitations in the detection range, and cannot meet the high-precision detection requirements in a large thickness range, which cannot meet the actual engineering requirements of heat treatment workpiece hardened layer measurement. SUMMARY

[0004] The purpose of the present application is to provide a heat treatment hardened layer thickness detection method, device, equipment, medium and product, which can solve the problem of "the traditional heat treatment hardened layer thickness detection method has obvious limitations in the detection range, and cannot meet the high-precision detection requirements in a large thickness range".

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] In a first aspect, the present application provides a heat treatment hardened layer thickness detection method, comprising:

[0007] The excitation probe and the receiving probe are connected to the water tank in which the heat treatment sample to be measured is placed at a specific angle, the excitation probe is used to emit an ultrasonic excitation signal, and the receiving probe is used to receive a straight-through signal and a reflected signal;

[0008] The probe spacing is gradually increased, and the waveform characteristics of the reflected signal are monitored. Based on the distortion of the reflected signal, the corresponding probe spacing interval is determined.

[0009] The probe spacing interval is refined by a bisection method to obtain the mean value of the probe spacing interval;

[0010] The first peak position time of the through signal and the second peak position time of the reflected signal are obtained when the probe spacing is the average value of the probe spacing interval.

[0011] The thickness of the heat-treated hardened layer is determined based on the specific angle, the time of the first peak position, the time of the second peak position, the average value of the probe spacing interval, and the sound velocity.

[0012] In one embodiment, the step of refining the probe spacing interval using a bisection method to obtain the mean value of the probe spacing interval specifically includes:

[0013] Calculate the median value of the probe spacing range;

[0014] When the probe spacing is at the middle value, the distortion of the reflected signal is determined, and the probe spacing range is updated based on the distortion of the reflected signal.

[0015] Calculate the error of the updated probe spacing range;

[0016] When the error meets the preset accuracy requirement, the mean value of the probe spacing interval that meets the accuracy requirement is calculated and used as the mean value of the probe spacing interval.

[0017] In one embodiment, the step of updating the probe spacing range based on the distortion of the reflected signal specifically includes:

[0018] When the reflected waveform is not distorted, the lower limit of the probe spacing interval is updated to the middle value, while the upper limit of the probe spacing interval remains unchanged, thus forming the updated probe spacing interval.

[0019] When the reflected waveform is distorted, the upper limit of the probe spacing interval is updated to the middle value, while the lower limit of the probe spacing interval remains unchanged, thus forming the updated probe spacing interval.

[0020] In one embodiment, the step of determining the thickness of the heat-treated hardened layer based on the specific angle, the time of the first peak position, the time of the second peak position, the average value of the probe spacing interval, and the sound velocity specifically includes:

[0021] Based on the wave mode transform Snyder's law, the first critical angle and the second critical angle of the heat-treated sample under test are calculated.

[0022] determining the acoustic path difference based on the first peak position time, the second peak position time and the sound velocity according to the relationship between the specific angle and the first critical angle and the second critical angle;

[0023] determining the half-reflection acoustic path based on the acoustic path difference and the probe distance interval mean value;

[0024] determining the heat treatment hardened layer thickness based on the half-reflection acoustic path and the acoustic path difference.

[0025] In an embodiment, the step of determining the acoustic path difference based on the first peak position time, the second peak position time and the sound velocity according to the relationship between the specific angle and the first critical angle and the second critical angle specifically comprises:

[0026] when the specific angle is less than the first critical angle, determining the acoustic path difference based on the first peak position time, the second peak position time and the longitudinal wave sound velocity of the sample material;

[0027] when the specific angle is between the first critical angle and the second critical angle, determining the acoustic path difference based on the first peak position time, the second peak position time, the longitudinal wave sound velocity of the sample material and the transverse wave sound velocity of the sample material.

[0028] In an embodiment, the step of determining the heat treatment hardened layer thickness based on the half-reflection acoustic path and the acoustic path difference has the following calculation formula:

[0029] T =

[0030] wherein, T is the heat treatment hardened layer thickness, is the half-reflection acoustic path, is the acoustic path difference.

[0031] In a second aspect, the present application further provides a device for detecting the heat treatment hardened layer thickness, comprising:

[0032] a probe arrangement module, connecting an excitation probe and a receiving probe to a water tank in which a heat treatment sample is placed at a specific angle, the excitation probe being used for emitting an ultrasonic excitation signal, and the receiving probe being used for receiving a direct signal and a reflected signal;

[0033] an interval determination module, gradually increasing the probe distance and monitoring the waveform characteristics of the reflected signal, determining the corresponding probe distance interval based on the distortion of the reflected signal;

[0034] a precision refinement module, performing bisection refinement on the probe distance interval to obtain a probe distance interval mean value;

[0035] a signal acquisition module, configured to acquire a first peak position time of the direct signal and a second peak position time of the reflected signal when the probe spacing is equal to the average value of the probe spacing interval;

[0036] a thickness calculation module, configured to determine the thickness of the heat treatment hardened layer based on the specific angle, the first peak position time, the second peak position time, the average value of the probe spacing interval and the sound speed.

[0037] In a third aspect, the present application also provides a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the above method.

[0038] In a fourth aspect, the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the above method.

[0039] In a fifth aspect, the present application also provides a computer program product, comprising a computer program, and the computer program is executed by a processor to implement the above method.

[0040] According to the specific embodiments provided by the present application, the present application discloses the following technical effects:

[0041] The present application provides a method for detecting the thickness of a heat treatment hardened layer, which adopts a double-probe arrangement mode of "one transmitting and one receiving" combined with an ultrasonic diffraction time difference method, calculates the thickness by analyzing the sound path difference between the surface direct signal and the reflected signal, breaks away from the technical limitations of traditional single-probe relying on LCR wave, surface wave or transverse wave, and improves the application range of nondestructive testing. At the same time, the key probe spacing interval is determined by monitoring the distortion characteristics of the reflected signal waveform, and the dichotomy method is used for iterative refinement. The dichotomy refinement can efficiently and iteratively narrow the probe spacing interval of the reflected signal distortion, and improve the efficiency and reliability of the thickness detection under the premise of ensuring the accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0043] Figure 1 The method flow chart of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0044] Figure 2A schematic diagram of the propagation principle of the surface direct signal and the interface reflection signal of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0045] Figure 3 A schematic diagram of the detection principle of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0046] Figure 4 A schematic diagram of the waveform evolution of the received signal of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0047] Figure 5 A schematic diagram of the waveform transmission when the incident angle of the excitation probe of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application is less than the first critical angle;

[0048] Figure 6 A schematic diagram of the waveform transmission when the incident angle of the excitation probe of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application is between the first critical angle and the second critical angle;

[0049] Figure 7 A schematic diagram of the hardened layer thickness detection grid division of the 35MnB rail link part of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0050] Figure 8 A detection device display diagram in actual use of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0051] Figure 9 A schematic diagram of the preset positions of the excitation probe and the receiving probe for the hardened layer thickness detection of the 35MnB rail link part of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0052] Figure 10 A waveform diagram corresponding to the probe spacing of 30mm of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0053] Figure 11 A waveform diagram corresponding to the probe spacing of 40mm of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0054] Figure 12 A time folding line diagram of the direct signal and the reflection signal of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0055] Figure 13 A time folding line diagram of the detection result of the heat treatment hardened layer thickness after the bisection refinement of the method for detecting the thickness of the heat treatment hardened layer according to an embodiment of the present application;

[0056] Figure 14A structural schematic diagram of a computer device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0058] The above purposes, features and advantages of the present application will be more apparent and understandable. The present application will be described in further detail below with reference to the drawings and specific embodiments.

[0059] Referring to Figure 1 The present application provides a method for detecting the thickness of a heat treatment hardened layer, comprising the following steps:

[0060] S100: connecting an excitation probe and a receiving probe to a water tank in which a heat treatment sample to be detected is placed at a specific angle, the excitation probe being used for emitting an ultrasonic excitation signal, and the receiving probe being used for receiving a direct signal and a reflected signal;

[0061] S200: gradually increasing the probe spacing, and monitoring the waveform characteristics of the reflected signal, so as to determine the corresponding probe spacing interval based on the distortion of the reflected signal;

[0062] S300: performing bisection refinement on the probe spacing interval to obtain the mean value of the probe spacing interval;

[0063] S400: obtaining the first peak position time of the direct signal and the second peak position time of the reflected signal when the probe spacing is the mean value of the probe spacing interval;

[0064] S500: determining the thickness of the heat treatment hardened layer based on the specific angle, the first peak position time, the second peak position time, the mean value of the probe spacing interval and the sound speed.

[0065] In S100, the heat treatment sample to be detected is placed flat in the water tank and fixed, and the excitation probe and the receiving probe are placed in the preset position, and the initial probe spacing is L0. The angle of the excitation probe and the receiving probe is adjusted to a specific angle by a precision bidirectional rotating mechanism.

[0066] Referring to Figure 2 The signal generator is set to have an ultrasonic excitation signal with an amplitude A and a period t, and the ultrasonic excitation signal is transmitted in the form of oblique incidence longitudinal wave to the water-sample interface, and is transmitted along the sample surface directly and in the hardened layer-core interface reflection path respectively.

[0067] In S200, referring toFigure 3 As the probe spacing L increases, the detection position gradually changes from the inside of the hardened layer to the hardened layer-core interface, the reflected signal is processed by the signal amplifier, and is collected and displayed by the digital oscilloscope. Referring to Figure 4 The degree of overlap between the reflected signal and the direct signal gradually decreases and separates, and when the reflected signal is distorted, the corresponding probe spacing interval [L a0 , L b0 ] is determined.

[0068] It should be noted that the grain size of the base material and the refined grains of the hardened layer have a relatively significant boundary, and the grain size of the base material is much larger than the grain size of the refined grains of the hardened layer. At this time, when the ultrasonic excitation signal is reflected by the core interface, the signal waveform will be distorted.

[0069] The lower limit value L a0 of the probe spacing interval in the present application can be initially selected as the minimum probe spacing , which depends on the hardware and is the minimum spacing that does not cause interference with the probe assembly. On the other hand, it depends on the minimum spacing at which the reflected signal and the direct signal do not produce signal overlap, and the larger value is taken. The upper limit value L b0 of the probe spacing interval is the probe spacing corresponding to the first observation of the distortion of the reflected signal waveform.

[0070] In S300, specifically, the step of bisection refinement of the probe spacing interval to obtain the mean value of the probe spacing interval includes: calculating the middle value of the probe spacing interval; when the probe spacing is the middle value, judging the distortion condition of the reflected signal, and updating the probe spacing interval based on the distortion condition of the reflected signal; calculating the error of the updated probe spacing interval; when the error meets the preset accuracy requirement, calculating the mean value of the probe spacing interval that meets the accuracy requirement as the mean value of the probe spacing interval.

[0071] When the error does not meet the preset accuracy requirement, the steps of calculating the middle value, judging the distortion condition, updating the interval and calculating the error are repeatedly executed based on the updated probe spacing interval for the next iteration until the error meets the accuracy requirement.

[0072] Further, the step of updating the probe spacing interval based on the distortion condition of the reflected signal includes: when the reflected waveform is not distorted, the lower limit value of the probe spacing interval is updated to the middle value, and the upper limit value of the probe spacing interval remains unchanged to form the updated probe spacing interval; when the reflected waveform is distorted, the upper limit value of the probe spacing interval is updated to the middle value, and the lower limit value of the probe spacing interval remains unchanged to form the updated probe spacing interval.

[0073] For example, it is judged whether the received reflection waveform is distorted, if no distortion signal is detected, the probe spacing L is gradually increased until the distortion signal is detected. Then, the probe spacing interval is refined by bisection method, when the distortion signal is detected for the first time, the upper limit value and the lower limit value of the probe spacing interval are L b0 and L a0 respectively, and the expression of the corresponding intermediate value L m0 is:

[0074]

[0075] If the reflection signal waveform is not distorted when the probe spacing is L m0 , L m0 is taken as the lower limit value L a1 of the spacing interval, L b0 is taken as the upper limit value L b1 of the spacing interval, and the expression of the corresponding intermediate value L m1 is:

[0076]

[0077] If the reflection signal waveform is distorted when the probe spacing is L m0 , L m0 is taken as the upper limit value L b1 of the spacing interval, L a0 is taken as the lower limit value L a1 of the spacing interval, and the expression of the corresponding intermediate value L m1 is:

[0078]

[0079] According to the distortion of the reflection signal waveform when the probe spacing is L m1 , the corresponding upper limit value L a2 and the lower limit value L b2 of the spacing interval are determined, the above operation is repeated until the error ξ reaches the precision δ requirement, the average value L avg of the interval is taken as the probe spacing, and the expression of the error ξ and the average value L avg of the probe spacing interval is:

[0080]

[0081]

[0082] Wherein, i is the number of bisection refinement.

[0083] In S400 and S500, the angles of the excitation probe and the receiving probe are the same, and the receiving probe captures the direct signal peak position time and the reflected signal peak position time as t1 and t2, i.e. the first peak position time and the second peak position time.

[0084] Specifically, the step of determining the heat treatment hardened layer thickness based on the specific angle, the first peak position time, the second peak position time, the probe interval range mean value and the sound speed specifically comprises: calculating the first critical angle and the second critical angle of the heat treatment sample to be measured based on the wave type transformation Snell law; determining the sound path difference based on the first peak position time, the second peak position time and the sound speed according to the relationship between the specific angle and the first critical angle and the second critical angle; determining the half-reflection sound path based on the sound path difference and the probe interval range mean value; and determining the heat treatment hardened layer thickness based on the half-reflection sound path and the sound path difference.

[0085] Further, the step of determining the sound path difference based on the first peak position time, the second peak position time and the sound speed according to the relationship between the specific angle and the first critical angle and the second critical angle specifically comprises: when the specific angle is less than the first critical angle, determining the sound path difference based on the first peak position time, the second peak position time and the longitudinal wave speed of the sample material; and when the specific angle is between the first critical angle and the second critical angle, determining the sound path difference based on the first peak position time, the second peak position time, the longitudinal wave speed of the sample material and the transverse wave speed of the sample material.

[0086] Referring to Figure 5 , the ultrasonic excitation signal adopts a longitudinal wave oblique incidence waveform, and the first critical angle θ1 and the second critical angle θ2 of the material are calculated based on the wave type transformation Snell law. Wherein, the calculation of the first critical angle and the second critical angle based on the wave type transformation Snell law is a common existing technology and will not be described in detail. If the ultrasonic excitation signal incidence angle is less than the first critical angle, i.e. α < θ1, no wave type transformation occurs, wherein the reflected signal waveform in the heat treatment hardened layer is still a longitudinal wave, and the longitudinal wave speed of the sample material is c L The corresponding sound path difference ΔL and half-reflection sound path l1 expressions are:

[0087]

[0088]

[0089] Referring to Figure 6 , if the ultrasonic excitation signal incidence angle is between the first critical angle and the second critical angle, i.e. θ1 < α < θ2, the ultrasonic signal undergoes wave type transformation at the water-sample interface, wherein the reflected signal waveform in the heat treatment hardened layer is a transverse wave, the surface direct signal waveform is a longitudinal wave, and the transverse wave speed of the sample material is c T The corresponding sound path difference ΔL and half-reflection sound path l1 expressions are:

[0090]

[0091]

[0092] The principle of selecting the incident angle a includes that when the incident angle a is small, the refraction angle b is small, resulting in insufficient detection depth; when the incident angle a is large, it is necessary to ensure that the distance between the excitation probe and the receiving probe is large enough, which will affect the selection of the measurement position, and the material organization defects, surface morphology distortion and the like will introduce measurement errors due to the increase of the transmission path of the direct signal and the reflected signal. The person skilled in the art can select a suitable incident angle according to the actual situation.

[0093] The step of determining the thickness of the heat treatment hardened layer based on the half-reflection acoustic path and the acoustic path difference is calculated by the formula:

[0094] T =

[0095] In the formula, T is the thickness of the heat treatment hardened layer, is the half-reflection acoustic path, is the acoustic path difference.

[0096] Before the probe distance interval is refined by bisection method to obtain the probe distance interval mean in the present application, the first heat treatment thickness corresponding to the upper limit value of the probe distance interval can be calculated, and the second heat treatment thickness corresponding to the lower limit value of the probe distance interval can be calculated to obtain an initial heat treatment thickness interval. The method of calculating the first heat treatment thickness and the second heat treatment thickness is consistent with the above-mentioned method of calculating the heat treatment hardened layer thickness, and will not be described in detail. By determining the initial heat treatment thickness interval, the approximate range of the heat treatment hardened layer thickness is preliminarily framed, which can provide a reference for subsequent determination of the final heat treatment hardened layer thickness.

[0097] In one specific embodiment, a 35MnB material rail piece is selected as a heat treatment sample to be measured, and according to the inherent properties of the material, the water longitudinal wave speed c wL is 1480 m / s, the longitudinal wave speed c L of the sample material is 5600 m / s, and the transverse wave speed c T of the sample material is 3200 m / s. Based on the wave type transformation Snell's law, the first critical angle 15.32° and the second critical angle 27.55° of the material are calculated. The specific test steps are as follows:

[0098] Step 1: Referring to Figure 7 , the surface of the 35MnB material rail piece to be measured is divided to obtain a uniform detection grid, and the size of the grid is 12.5 mm × 20 mm.

[0099] Step 2: See Figure 8 Two sets of I2-2.5P6F15-H immersion ultrasonic probes (excitation frequency: 2.5 MHz; focal length: 15 mm) were selected as the excitation probe and the receiving probe, respectively. The overall equipment includes a precision scanning motion platform, a precision positioning device, a precision rotation mechanism, an excitation probe, a receiving probe and a water tank, as well as the corresponding signal generation and detection parts, including a signal generator, a signal amplifier and a digital oscilloscope.

[0100] See Figure 9 The 35MnB material track link part to be tested is placed flat in the water tank and fixed. The excitation probe and the receiving probe are placed in the preset position, and the angles of the two probes are the same. The incident angle α of the ultrasonic excitation signal is set to 11°. At this time, the incident angle is less than the first critical angle of the material. The oblique incident waveform is a longitudinal wave and no waveform transformation occurs. The initial probe spacing L0=30mm.

[0101] Step 3: Set the ultrasonic excitation signal for the signal generator, with amplitude A set to 0.8 V and period t to 2 μs. The ultrasonic excitation signal is obliquely incident on the water-sample interface and propagates directly along the sample surface and through a reflection path at the hardened layer-core interface.

[0102] Step 4: Gradually increase the probe spacing, see... Figure 8 The ultrasonic excitation signal is amplified and displayed on a digital oscilloscope. The direct signal propagates along the surface, and its signal strength decreases significantly with increasing probe spacing; the reflected signal has a relatively high strength. See also Figure 10 and Figure 11 When the probe spacing is 40mm, the upper limit value L of the probe spacing range is obtained. b0 At this point, the reflected waveform is distorted. When the probe spacing is 30mm, the lower limit value L of the probe spacing range is obtained. a0 At this time, the reflected waveform is not distorted.

[0103] Step 5: See Figure 12 When the probe spacing is 30mm and 40mm, the time difference Δt between the peak positions of the through signal and the reflected signal is 5μs and 6.68μs, respectively, from which the corresponding acoustic path difference ΔL is obtained as 28mm and 37.408mm, respectively. Through calculation, the initial heat treatment thickness range [25.397, 33.885] is obtained.

[0104] Step 6: Refer to Figure 13 As shown, the probe spacing interval is refined using a bisection method, and the median value L of the probe interval is taken. m0= 35mm, since the received reflection signal waveform does not occur distortion when the probe interval is 35mm, the measured corresponding heat treatment hardened layer thickness is 29.641mm, which does not reach the precision δ = 1mm, then the probe interval interval of the first iteration is [35, 40]. When the probe interval L m1 = 37.5mm, the reflection waveform does not occur distortion, the measured corresponding thickness is 31.763mm, which does not reach the precision requirement, then the interval of the second iteration is [37.5, 40]. The middle value L m2 = 38.75mm in the interval is taken, the measured corresponding heat treatment hardened layer thickness is 32.848mm, which does not reach the precision requirement, then the interval of the third iteration is [38.75, 40]. The middle value L m3 = 39.375mm in the interval is taken, the measured corresponding heat treatment hardened layer thickness is 33.355mm, at this time the detection depth error ξ is less than 1mm, which satisfies the precision requirement, and the average value L avg = 39.6875mm of the probe interval interval is taken as the probe interval, the refined heat treatment hardened layer thickness is 33.620mm, and the high-precision nondestructive detection of the large-thickness hardened layer is realized.

[0105] The application adopts the "one transmitting and one receiving" ultrasonic probe arrangement mode, combines the path difference analysis of the direct signal and the reflection signal, realizes the measurement of the heat treatment hardened layer thickness, breaks through the technical limitations of the traditional single probe detection method in depth and precision, simultaneously, through arranging the excitation probe and the receiving probe at a specific angle in the water tank, the probe interval interval is determined by monitoring the waveform characteristics of the reflection signal, and then the accurate interval average value is obtained through the dichotomy refinement. The dichotomy refinement can efficiently iterate and narrow the probe interval interval of the reflection signal distortion, improves the efficiency and reliability of the thickness detection under the premise of ensuring the precision. In the actual application process, the application can realize the accurate calculation of the heat treatment hardened layer thickness of 30mm.

[0106] Based on the same inventive concept, the application also provides a detection device for the heat treatment hardened layer thickness. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more detection device embodiments for the heat treatment hardened layer thickness provided below can refer to the limitations of the detection method for the heat treatment hardened layer thickness in the above text, which will not be described here again.

[0107] The application also provides a detection device for the heat treatment hardened layer thickness, which comprises:

[0108] The probe arrangement module connects the excitation probe and the receiving probe at a specific angle on the water tank in which the heat treatment sample to be measured is placed, the excitation probe is used for transmitting the ultrasonic excitation signal, and the receiving probe is used for receiving the direct signal and the reflection signal;

[0109] an interval determination module, gradually increasing the probe spacing, and monitoring the waveform characteristics of the reflected signal, to determine the corresponding probe spacing interval based on distortion of the reflected signal;

[0110] a precision refinement module, performing bisection refinement on the probe spacing interval to obtain a probe spacing interval mean value;

[0111] a signal acquisition module, acquiring a first peak position time of the direct signal and a second peak position time of the reflected signal when the probe spacing is at the probe spacing interval mean value;

[0112] a thickness calculation module, determining the heat treatment hardened layer thickness based on a specific angle, the first peak position time, the second peak position time, the probe spacing interval mean value, and a sound speed.

[0113] In an exemplary embodiment, a computer device is provided, which can be a server or a terminal, and an internal structure diagram thereof can be as shown in Figure 14 The computer device includes a processor, a memory, an input / output interface (I / O), and a communication interface. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to communicate with external terminals through a network connection.

[0114] Those skilled in the art can understand that Figure 14 the structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0115] In an exemplary embodiment, a computer device is provided, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0116] In an exemplary embodiment, a computer readable storage medium is provided, which stores a computer program. The computer program is executed by a processor to implement the steps in the above method embodiments.

[0117] In an example embodiment, a computer program product is provided, including a computer program which, when executed by a processor, implements the steps of any of the above method embodiments.

[0118] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0119] It can be understood by those skilled in the art that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. Any reference to memory, database or other medium used in the embodiments provided by the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0120] The database involved in the embodiments provided by the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on blockchain, etc., without being limited thereto. The processor involved in the embodiments provided by the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0121] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, it should be understood that the application encompasses all possible combinations of the technical features unless such a combination is not technically possible.

[0122] The principles and implementation manners of the present application are described herein by using specific examples, and the above embodiments are only used to help understand the method of the present application and its core idea; meanwhile, according to the idea of the present application, the specific implementation manners and application scopes will be changed by those skilled in the art. In conclusion, the content of the present specification should not be understood as a limitation of the present application.

Claims

1. A method for detecting the thickness of a heat-treated hardened layer, characterized in that, include: An excitation probe and a receiving probe are connected at a specific angle to a water bath on which a heat-treated sample to be tested is placed. The excitation probe is used to emit an ultrasonic excitation signal, and the receiving probe is used to receive the direct signal and the reflected signal. Gradually increase the probe spacing and monitor the waveform characteristics of the reflected signal. Based on the distortion of the reflected signal, determine the corresponding probe spacing range. The probe spacing interval is refined by a bisection method to obtain the mean value of the probe spacing interval; The first peak position time of the through signal and the second peak position time of the reflected signal are obtained when the probe spacing is the average value of the probe spacing interval. The thickness of the heat-treated hardened layer is determined based on the specific angle, the time of the first peak position, the time of the second peak position, the average value of the probe spacing interval, and the sound velocity. The step of determining the thickness of the heat-treated hardened layer based on the specific angle, the time of the first peak position, the time of the second peak position, the average value of the probe spacing interval, and the sound velocity specifically includes: Based on the wave mode transform Snyder's law, the first critical angle and the second critical angle of the heat-treated sample under test are calculated. Based on the relationship between the specific angle and the first critical angle and the second critical angle, the sound path difference is determined based on the first peak position time, the second peak position time, and the sound speed. The half-reflection path is determined based on the sound path difference and the average value of the probe spacing interval; The thickness of the heat-treated hardened layer is determined based on the half-reflection path and the path difference.

2. The method for detecting the thickness of the heat-treated hardened layer according to claim 1, characterized in that, The step of refining the probe spacing interval using a bisection method to obtain the mean value of the probe spacing interval specifically includes: Calculate the median value of the probe spacing range; When the probe spacing is at the middle value, the distortion of the reflected signal is determined, and the probe spacing range is updated based on the distortion of the reflected signal. Calculate the error of the updated probe spacing range; When the error meets the preset accuracy requirement, the mean value of the probe spacing interval that meets the accuracy requirement is calculated and used as the mean value of the probe spacing interval.

3. The method for detecting the thickness of the heat-treated hardened layer according to claim 2, characterized in that, The step of updating the probe spacing range based on the distortion of the reflected signal specifically includes: When the reflected waveform is not distorted, the lower limit of the probe spacing interval is updated to the middle value, while the upper limit of the probe spacing interval remains unchanged, thus forming the updated probe spacing interval. When the reflected waveform is distorted, the upper limit of the probe spacing interval is updated to the middle value, while the lower limit of the probe spacing interval remains unchanged, thus forming the updated probe spacing interval.

4. The method for detecting the thickness of the heat-treated hardened layer according to claim 1, characterized in that, The step of determining the sound path difference based on the relationship between the specific angle and the first critical angle and the second critical angle, and based on the first peak position time, the second peak position time, and the sound velocity, specifically includes: When the specific angle is less than the first critical angle, the acoustic path difference is determined based on the first peak position time, the second peak position time, and the longitudinal wave velocity of the sample material. When the specific angle is between the first critical angle and the second critical angle, the sound path difference is determined based on the first peak position time, the second peak position time, the longitudinal wave velocity of the sample material, and the transverse wave velocity of the sample material.

5. The method for detecting the thickness of the heat-treated hardened layer according to claim 1, characterized in that, The step of determining the thickness of the heat-treated hardened layer based on the half-reflection sound path and the sound path difference is calculated using the following formula: T= ； In the formula, T is the thickness of the heat-treated hardened layer. The half-reflection path, The sound path difference is mentioned.

6. A device for detecting the thickness of a heat-treated hardened layer, characterized in that, include: probe The module connects the excitation probe and the receiving probe at a specific angle to a water bath on which the heat-treated sample to be tested is placed. The excitation probe is used to emit ultrasonic excitation signals, and the receiving probe is used to receive direct signals and reflected signals. The interval determination module gradually increases the probe spacing and monitors the waveform characteristics of the reflected signal. Based on the distortion of the reflected signal, it determines the corresponding probe spacing interval. The precision refinement module refines the probe spacing interval using a bisection method to obtain the mean value of the probe spacing interval; The signal acquisition module acquires the first peak position time of the through signal and the second peak position time of the reflected signal when the probe spacing is the average value of the probe spacing interval. The thickness calculation module determines the thickness of the heat-treated hardened layer based on the specific angle, the time of the first peak position, the time of the second peak position, the average value of the probe spacing interval, and the sound velocity. The step of determining the thickness of the heat-treated hardened layer based on the specific angle, the time of the first peak position, the time of the second peak position, the average value of the probe spacing interval, and the sound velocity specifically includes: Based on the wave mode transform Snyder's law, the first critical angle and the second critical angle of the heat-treated sample under test are calculated. Based on the relationship between the specific angle and the first critical angle and the second critical angle, the sound path difference is determined based on the first peak position time, the second peak position time, and the sound speed. The half-reflection path is determined based on the sound path difference and the average value of the probe spacing interval; The thickness of the heat-treated hardened layer is determined based on the half-reflection path and the path difference.

7. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the method for detecting the thickness of the heat-treated hardened layer according to any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the method for detecting the thickness of the heat-treated hardened layer as described in any one of claims 1-5.

9. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the method for detecting the thickness of the heat-treated hardened layer as described in any one of claims 1-5.

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