Online monitoring system and method for laser shock peening quality

Abstract

The embodiment of the invention provides an online monitoring system and method for laser shock peening quality, and the system comprises a laser processing subsystem which is used for transmitting laser to the surface of a target processing workpiece so as to carry out laser shock peening processing on the target processing workpiece; the sound wave detection subsystem is used for collecting sound wave signals generated on the surface of a target machining workpiece and transmitting the sound wave signals to the data processing subsystem in the laser shock peening machining process. The image acquisition subsystem is used for acquiring three-dimensional shape information of a target processing workpiece and transmitting the three-dimensional shape information to the data processing subsystem after laser shock peening processing is completed; and the data processing subsystem is used for determining the laser shock peening quality of the target processing workpiece according to the sound wave signal and / or the three-dimensional shape information. The influence of laser shock peening on material deformation is considered, material deformation monitoring of the target machined workpiece is combined with sound wave reflection monitoring, comprehensive monitoring of the laser shock peening quality is achieved, and the monitoring accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser shock peening, and in particular to an online monitoring system and method for laser shock peening quality. Background Art

[0002] In the manufacturing field, laser is a newly developed new energy source. It is generally transmitted through a hard optical path composed of optical fibers or various lenses. After being focused by a laser processing head, it acts on the area to be processed. The area to be processed is located within the laser focus or near focus range. It has the characteristics of concentrated energy, high energy density, large thermal gradient in the processing area, and fast processing speed.

[0003] Laser Shock Peening (LSP) is a new surface modification technology that uses laser-induced plasma shock waves to act on the surface of metal materials to improve the material's fatigue resistance. It has the advantages of significant strengthening effect, strong controllability, and good adaptability. It plays an important role in improving structural reliability and component fatigue strength and extending material service life.

[0004] At present, the test method of laser shock peening effect is mainly to conduct offline detection of LSP-processed workpieces, using the pinhole method or the ray method to measure residual stress, which is inefficient. Research on online monitoring of the laser shock peening process has been carried out, and most of the methods that have been published are to monitor the laser shock peening effect from optical characteristics, acoustic characteristics, etc., which has the problem of incomplete and inaccurate quality monitoring of laser shock peening. Summary of the invention

[0005] The embodiments of the present invention provide an online monitoring system and method for laser shock peening quality, which realize comprehensive monitoring of laser shock peening quality and improve the monitoring accuracy.

[0006] In a first aspect, an embodiment of the present invention provides an online monitoring system for laser shock peening quality, comprising: a laser processing subsystem, an acoustic wave detection subsystem, an image acquisition subsystem, and a data processing subsystem;

[0007] The laser processing subsystem is used to emit laser to the surface of the target processing workpiece to perform laser shock peening processing on the target processing workpiece;

[0008] The acoustic wave detection subsystem is used to collect the acoustic wave signal generated on the surface of the target workpiece during the laser shock peening process and transmit it to the data processing subsystem;

[0009] The image acquisition subsystem is used to collect the three-dimensional morphology information of the target workpiece after the laser shock peening process is completed and transmit it to the data processing subsystem;

[0010] The data processing subsystem is used to determine the quality of laser shock peening of the target workpiece according to the acoustic wave signal and / or the three-dimensional morphology information.

[0011] In a second aspect, an embodiment of the present invention provides an online monitoring method for laser shock peening quality, which is performed by the online monitoring system for laser shock peening quality described in the embodiment of the first aspect, and the method includes:

[0012] The laser processing subsystem emits a laser to the surface of the target workpiece to perform laser shock peening processing on the target workpiece;

[0013] During the laser shock peening process, the acoustic wave detection subsystem collects the acoustic wave signal generated on the surface of the target workpiece and transmits it to the data processing subsystem;

[0014] After the laser shock peening process is completed, the image acquisition subsystem collects the three-dimensional morphology information of the target workpiece and transmits it to the data processing subsystem;

[0015] The laser shock peening quality of the target workpiece is determined by a data processing subsystem according to the acoustic wave signal and / or the three-dimensional morphology information.

[0016] The embodiment of the present invention provides an online monitoring system and method for the quality of laser shock peening, the system comprising: a laser processing subsystem for emitting laser to the surface of a target workpiece to perform laser shock peening on the target workpiece; an acoustic wave detection subsystem for collecting acoustic wave signals generated on the surface of the target workpiece during the laser shock peening process and transmitting them to a data processing subsystem; an image acquisition subsystem for collecting three-dimensional morphological information of the target workpiece after the laser shock peening process is completed and transmitting them to a data processing subsystem; a data processing subsystem for determining the quality of laser shock peening of the target workpiece according to the acoustic wave signals and / or three-dimensional morphological information. The above technical scheme takes into account the influence of laser shock peening on material deformation, detects the laser shock peening effect by reflecting acoustic wave signals on the surface of the target workpiece during the laser shock peening process, and detects the laser shock peening effect by reflecting three-dimensional morphological information of the target workpiece after the laser shock peening is completed, combines material deformation monitoring with acoustic wave reflection monitoring, realizes comprehensive monitoring of the quality of laser shock peening, and improves the accuracy of monitoring.

[0017] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of an online monitoring system for laser shock peening quality provided in the first embodiment of the present invention;

[0020] Figure 2 Another structural schematic diagram of an online monitoring system for laser shock peening quality provided in the first embodiment of the present invention;

[0021] Figure 3 This is a structural example diagram of an online monitoring system for laser shock peening quality provided in the first embodiment of the present invention;

[0022] Figure 4 A schematic flow chart of an online monitoring method for laser shock peening quality provided in the second embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "original", "target", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Embodiment 1

[0026] Figure 1This is a schematic diagram of the structure of an online monitoring system for laser shock peening quality provided in Example 1 of the present invention. The system can be applied to the situation of online monitoring of laser shock peening quality. The system can be implemented in the form of hardware and / or software.

[0027] like Figure 1 As shown, the online monitoring system for laser shock peening quality provided in the first embodiment includes: a laser processing subsystem 11, an acoustic wave detection subsystem 12, an image acquisition subsystem 13 and a data processing subsystem 14; the laser processing subsystem 11 is used to emit laser to the surface of the target workpiece to perform laser shock peening processing on the target workpiece; the acoustic wave detection subsystem 12 is used to collect the acoustic wave signal generated on the surface of the target workpiece during the laser shock peening processing and transmit it to the data processing subsystem; the image acquisition subsystem 13 is used to collect the three-dimensional morphology information of the target workpiece after the laser shock peening processing is completed and transmit it to the data processing subsystem; the data processing subsystem 14 is used to determine the laser shock peening quality of the target workpiece based on the acoustic wave signal and / or the three-dimensional morphology information.

[0028] In this embodiment, in order to monitor the quality of laser shock peening of the processed workpiece, an online monitoring system for laser shock peening quality provided in this embodiment is used for monitoring. The system at least includes a laser processing subsystem 11, an acoustic wave detection subsystem 12, an image detection subsystem 13 and a data processing subsystem 14.

[0029] Among them, the target workpiece can be understood as the workpiece to be processed for laser shock strengthening. Exemplarily, the target workpiece can be an aircraft engine blade disk, shaft parts, etc. The laser processing subsystem 11 is used to emit laser to the surface of the target workpiece to perform laser shock strengthening on the target workpiece. Exemplarily, the laser processing subsystem can be connected to the control system electrical signal, and the control system controls the laser processing subsystem to emit laser to the surface of the target workpiece so that the workpiece surface generates an acoustic signal. In this embodiment, the laser processing system 11 includes a laser, a constraint layer, an absorption layer, and a workbench, and the workbench is provided with a clamping tool. Preferably, the workbench can perform three-axis motion of X-axis, Y-axis, and Z-axis, and the workpiece is fixed on the workbench by a clamping tool. The laser energy E of the laser is between 2-10J, the laser spot size is 2mm-5mm, the laser pulse width is 8ns-16ns, and the pulse repetition rate is 10Hz.

[0030] Continuing with the above description, when the target workpiece is subjected to laser shock peening, an acoustic wave signal is generated on the surface of the target workpiece. Based on this, the acoustic wave detection subsystem 12 collects the acoustic wave signal generated on the surface of the target workpiece during the laser shock peening process, and sends the acoustic wave signal to the data processing subsystem 14, so that the digital processing subsystem 14 can monitor the quality of the laser shock peening based on the acoustic wave signal.

[0031] Considering that the existing technology does not take into account the impact of laser shock peening on material deformation when monitoring the quality of laser shock peening, especially some thin-walled materials, for example, when using laser shock peening to strengthen the integral blade disk of an aero-engine, the blades are prone to deformation, thereby reducing the quality of the blade disk; or in the laser shock peening process of shaft parts, due to the dual influence of the laser shock wave and the clamping force of the fixture, the shaft parts are prone to deformation, resulting in problems such as instability in the use of the parts.

[0032] Based on the above problems, in this embodiment, while using the acoustic wave signal for quality monitoring, the deformation of the target workpiece is considered to determine the quality of laser shock peening. The image acquisition subsystem 13 is used to collect the three-dimensional morphology information of the target workpiece after the laser shock peening process is completed and transmit it to the data processing subsystem 14. The three-dimensional morphology information is information related to the deformation of the target workpiece, which can be understood as the entire three-dimensional morphology information that characterizes the target workpiece. Exemplarily, the image acquisition subsystem 13 may include a three-dimensional morphology measuring instrument, which uses the three-dimensional morphology measuring instrument to scan the target workpiece after laser shock peening, obtain the scanned three-dimensional morphology data of the target workpiece as three-dimensional morphology information, and transmit the three-dimensional morphology information to the data processing subsystem 14, so that the data processing subsystem 14 uses the three-dimensional morphology information to monitor the quality of laser shock peening.

[0033] In this embodiment, the data processing subsystem 14 is used to determine the quality of laser shock peening of the target workpiece according to the acoustic wave signal and / or the three-dimensional morphology information. The data processing subsystem 14 receives the acoustic wave signal transmitted by the acoustic wave detection subsystem and the three-dimensional morphology information transmitted by the image detection subsystem. In this embodiment, there is no specific restriction on the transmission time of the acoustic wave signal and the three-dimensional morphology information. The acoustic wave signal and the three-dimensional morphology information collected in real time can be transmitted to the data processing subsystem 14 in real time. The data processing subsystem 14 can analyze the acoustic wave signal and / or the three-dimensional morphology information received in real time to determine the quality monitoring of the laser shock peening of the target workpiece.

[0034] The process of the data processing subsystem 14 receiving and processing the acoustic wave signal transmitted by the acoustic wave detection subsystem can be described as: comparing the acoustic wave signal with the set standard acoustic signal. If the input acoustic signal exceeds the standard acoustic signal range, it means that the laser shock peening effect is not good; otherwise, it means that the laser shock peening effect is good. Exemplarily, the data processing subsystem calculates the input acoustic wave signal through the relevant function formula of the control program to obtain the sound pressure constant value. When the laser shock peening works normally, the sound pressure value is within a specified range. If the value is lower than this range, it means that the work quality is reduced, and if the value is higher than this range, it means that there is a problem with the working state. Based on this, when the calculated sound pressure constant value is not within the standard acoustic signal range, it is determined that the laser shock peening effect is not good.

[0035] The data processing subsystem 14 is also used to receive and process the three-dimensional morphology information of the target workpiece transmitted by the image acquisition subsystem. The process can be described as follows: compare the three-dimensional morphology information with the set three-dimensional morphology of the standard workpiece. If the deformation of the workpiece after laser shock peening exceeds the maximum deformation value allowed by the standard workpiece, it means that the laser shock peening effect is not good; otherwise, it means that the laser shock peening effect is good. Exemplarily, the data processing subsystem coordinately aligns the three-dimensional morphology information of the target workpiece with the three-dimensional CAD model of the standard product, performs comparative analysis, obtains the visualization result of the deformation of the entire part, and determines the deformation of the target workpiece. When the laser shock peening works normally, the deformation of the workpiece has a maximum value. If the value exceeds the maximum value, it means that there is a problem with the working state. Based on this, when the calculated deformation exceeds the set maximum deformation, it is determined that the laser shock peening effect is not good.

[0036] It should be noted that, in this embodiment, the laser shock peening effect can be determined based on the acoustic wave signal alone, or based on the three-dimensional morphology information alone, or based on both the acoustic wave signal and the three-dimensional morphology information. For example, when it is determined based on the acoustic wave signal that the laser shock peening effect is not good, then the laser shock peening effect is determined to be not good; or when it is determined based on the three-dimensional morphology information that the laser shock peening effect is not good, then the laser shock peening effect is determined to be not good; or when it is determined based on the acoustic wave signal that the laser shock peening effect is not good and based on the three-dimensional morphology information that the laser shock peening effect is not good, then the laser shock peening effect is determined to be not good.

[0037] The embodiment of the present invention provides an online monitoring system for the quality of laser shock peening, which includes: a laser processing subsystem for emitting laser to the surface of a target workpiece to perform laser shock peening on the target workpiece; an acoustic wave detection subsystem for collecting acoustic wave signals generated on the surface of the target workpiece during the laser shock peening process and transmitting them to a data processing subsystem; an image acquisition subsystem for collecting three-dimensional morphological information of the target workpiece after the laser shock peening process is completed and transmitting them to a data processing subsystem; a data processing subsystem for determining the quality of laser shock peening of the target workpiece according to the acoustic wave signals and / or three-dimensional morphological information. The above technical scheme takes into account the influence of laser shock peening on material deformation, detects the effect of laser shock peening by reflecting acoustic wave signals on the surface of the target workpiece during the laser shock peening process, and detects the effect of laser shock peening by reflecting three-dimensional morphological information of the target workpiece after the laser shock peening is completed, combines material deformation monitoring with acoustic wave reflection monitoring, realizes comprehensive monitoring of the quality of laser shock peening, and improves the accuracy of monitoring.

[0038] Figure 2 Another structural schematic diagram of an online monitoring system for laser shock peening quality provided in the first embodiment of the present invention is shown in FIG. Figure 2 As shown, as a first optional embodiment of the embodiment of the present invention, on the basis of the above embodiment, the acoustic wave detection subsystem 12 can be optimized to include: an acoustic sensor 121 and a data acquisition card 122; the acoustic sensor 121 is used to collect the acoustic wave signal generated on the surface of the target workpiece during the laser shock intensive processing, and convert the acoustic wave signal into an electrical signal and transmit it to the data acquisition card; the data acquisition card 122 is used to convert the electrical signal into a digital signal and transmit the digital signal to the data processing subsystem.

[0039] In this embodiment, the acoustic wave detection subsystem includes an acoustic sensor 121 and a data acquisition card 122. There is no special restriction on the position and direction of the acoustic sensor. The acoustic sensor 121 is connected to the data acquisition card 122, and the data acquisition card 122 is connected to the data processing system 14.

[0040] Among them, the acoustic sensor 121 is used to collect the laser shock strengthening acoustic wave signal propagating in the air and convert the received acoustic signal into an electrical signal and transmit it to the data acquisition card 122; the data acquisition card 122 converts the received analog signal into a digital signal and transmits the digital signal to the data processing subsystem 14.

[0041] The above technical solution specifies that the acoustic wave detection subsystem includes an acoustic sensor and a data acquisition card. The acoustic sensor is used to collect acoustic wave signals and convert them into electrical signals. The electrical signals are analog signals. The data acquisition card is used to convert the analog signals into digital signals for transmission to the data processing subsystem, thereby realizing the collection and transmission of acoustic wave signals and providing basic data for subsequent laser shock strengthening quality monitoring based on acoustic wave signals.

[0042] As a second optional embodiment of the embodiment of the present invention, on the basis of the above embodiment, the image acquisition subsystem 13 can be optimized to include: a three-dimensional morphology measuring instrument 131, which is specifically used to: scan the target processed workpiece after laser shock intensive processing, and obtain the scanning data as the three-dimensional morphology information of the target processed workpiece; transmit the three-dimensional morphology information to the data processing subsystem.

[0043] In this embodiment, the image acquisition subsystem 13 includes a three-dimensional shape measuring instrument, which is connected to the data processing subsystem 14. The three-dimensional shape measuring instrument scans the target workpiece after laser shock peening, collects the three-dimensional shape data of the target workpiece, and transmits it to the data processing subsystem 14.

[0044] In this embodiment, the image acquisition subsystem 13 may further include a fill light device. The fill light device is used to supplement light when the light is insufficient to ensure that the high-definition image captured by the three-dimensional shape measuring instrument is obtained. The fill light device includes a fill light source and a fill light laser head, and the fill light source and the fill light laser head are connected through an optical fiber. Exemplarily, the fill light source is a 808nm wavelength semiconductor laser generator.

[0045] The above technical solution specifies that the three-dimensional image acquisition system includes a three-dimensional morphology measuring instrument, which realizes the collection of three-dimensional morphology information and transmits it to the data processing subsystem through the three-dimensional morphology measuring instrument, thereby realizing the collection and transmission of three-dimensional morphology information and providing basic data for subsequent laser shock strengthening quality monitoring based on three-dimensional morphology information.

[0046] As a third optional embodiment of the embodiment of the present invention, on the basis of the above embodiment, the data processing subsystem 14 can be optimized, including a first processing module 141, a second processing module 142 and a quality detection module 143; the first processing module 141 is used to compare the digital signal with a preset standard digital acoustic wave signal range to determine a first comparison result; the second processing module 142 is used to compare the three-dimensional morphology information with a preset standard three-dimensional morphology range to determine a second comparison result; the quality detection module 143 is used to determine the laser shock strengthening quality of the target workpiece according to the first comparison result and / or the second comparison result.

[0047] In this embodiment, the data processing subsystem 14 includes a first processing module 141, a second processing module 142 and a quality detection module 143. The process of the first processing module 141 for receiving and processing the sound wave signal transmitted by the sound wave detection subsystem can be described as: comparing the sound wave signal (i.e., digital signal) with the set standard sound signal, and obtaining the result as the first comparison result. The first comparison result may be that the received sound wave signal exceeds the standard sound signal range, or it may be that the received sound wave signal is within the standard sound signal range. The standard sound signal can be determined based on historical data.

[0048] In this embodiment, the second processing module 142 is used to receive and process the three-dimensional morphology information of the target workpiece transmitted by the image acquisition subsystem, and the process can be described as: comparing the three-dimensional morphology information with the set three-dimensional morphology of the standard workpiece, and obtaining a comparison result as the second comparison result. The second comparison result may be that the deformation of the workpiece after laser shock peening exceeds the maximum deformation value allowed by the standard workpiece; or it may be that the deformation of the workpiece after laser shock peening is within the maximum deformation value allowed by the standard workpiece.

[0049] Continuing with the above description, the quality detection module 143 is used to determine the laser shock peening effect on the target workpiece according to the first comparison result and the second comparison result. The first comparison result and the second comparison result may be that the first comparison result is that the digital signal exceeds the standard digital acoustic wave signal range, and the second comparison result is that the three-dimensional morphology information exceeds the standard three-dimensional morphology range; or the first comparison result is that the digital signal is within the standard digital acoustic wave signal range, and the second comparison result is that the three-dimensional morphology information exceeds the standard three-dimensional morphology range; or the first comparison result is that the digital signal exceeds the standard digital acoustic wave signal range, and the second comparison result is that the three-dimensional morphology information is within the standard three-dimensional morphology range; or the first comparison result is that the digital signal is within the standard digital acoustic wave signal range, and the second comparison result is that the three-dimensional morphology information is within the standard three-dimensional morphology range. Different situations correspond to different laser shock peening effects.

[0050] The above technical solution specifies that the data processing subsystem includes a first processing module, a second processing module and a quality detection module, and realizes the determination of the laser shock strengthening effect by integrating the acoustic wave signal and the three-dimensional morphology information.

[0051] Furthermore, the quality detection module 143 is specifically used to:

[0052] a1) If the first comparison result is that the digital signal exceeds the standard digital acoustic wave signal range, and / or the second comparison result is that the three-dimensional morphology information exceeds the standard three-dimensional morphology range, it is determined that the laser shock peening effect on the target workpiece is not good.

[0053] Specifically, if the first comparison result is that the digital signal exceeds the standard digital acoustic wave signal range, and the second comparison result is that the three-dimensional morphology information exceeds the standard three-dimensional morphology range; or the first comparison result is that the digital signal is within the standard digital acoustic wave signal range, and the second comparison result is that the three-dimensional morphology information exceeds the standard three-dimensional morphology range; or the first comparison result is that the digital signal exceeds the standard digital acoustic wave signal range, and the second comparison result is that the three-dimensional morphology information is within the standard three-dimensional morphology range, the above three situations all determine that the laser shock strengthening effect on the target workpiece is not good.

[0054] b1) Otherwise, it is determined that the laser shock peening effect on the target workpiece is good.

[0055] Specifically, if the first comparison result is that the digital signal is within the standard digital sound wave signal range, and the second comparison result is that the three-dimensional shape information is within the standard three-dimensional shape range.

[0056] The above technical solution specifies that the quality detection module determines the laser shock peening effect according to different situations of the first comparison result and the second comparison result.

[0057] Furthermore, the first processing module 141 is further configured to:

[0058] If the first comparison result is that the digital signal exceeds the standard digital sound wave signal range, a first warning signal is generated.

[0059] Specifically, if the first comparison result is that the digital signal exceeds the standard digital sound wave signal range, that is, the calculated sound pressure constant value is not within the standard sound signal range, a warning signal will be issued, which is recorded as the first warning signal.

[0060] Furthermore, the second processing module is also used for:

[0061] If the second comparison result is that the three-dimensional shape information exceeds the standard three-dimensional shape range, a second warning signal is generated.

[0062] Specifically, when the second comparison result is that the three-dimensional shape information exceeds the standard three-dimensional shape range, that is, the calculated deformation amount does not exceed the set maximum deformation amount, a warning signal will be issued, which is recorded as the second warning signal.

[0063] As a fourth optional embodiment of the embodiment of the present invention, on the basis of the above embodiment, the system can be optimized to also include an alarm subsystem 15 for issuing an alarm prompt when the first warning signal and / or the second warning signal is received.

[0064] Specifically, the alarm subsystem 15 receives a first warning signal and a second warning signal, and when the first warning signal is received and the second warning signal is not received, the alarm subsystem 15 issues an alarm prompt and transmits it to the control system; or when the first warning signal is not received and the second warning signal is received, the alarm subsystem 15 issues an alarm prompt and transmits it to the control system, or when the first warning signal and the second warning signal are received at the same time, the alarm system issues an alarm prompt and transmits it to the control system.

[0065] The above technical solution adds an alarm subsystem, which provides an alarm function so that users can understand the laser shock peening effect in real time.

[0066] As the fifth optional embodiment of the embodiment of the present invention, it can be optimized on the basis of the above embodiment. The system also includes a control subsystem 16, which is respectively communicated with the laser processing subsystem, the acoustic wave detection subsystem, the image acquisition subsystem, the data processing subsystem and the alarm subsystem.

[0067] In this embodiment, the system also includes a control subsystem 16, which is respectively connected to the laser processing subsystem 11, the acoustic wave detection subsystem 12, the image acquisition subsystem 13, the data processing subsystem 14 and the alarm subsystem 15. The control subsystem 16 can send control commands to each of the above subsystems, and can also receive information fed back by each subsystem. Exemplarily, the control subsystem controls the laser processing subsystem to emit laser to the surface of the target workpiece, so that the workpiece surface generates an acoustic signal. The alarm subsystem sends an alarm signal and transmits it to the control subsystem. When receiving the alarm signal, the control subsystem can control the laser processing subsystem to stop working or adjust parameters, and can also display the alarm signal on the human-computer interaction interface.

[0068] For example, Figure 3 This is a structural example diagram of an online monitoring system for laser shock peening quality provided in the first embodiment of the present invention, such as Figure 3 As shown, the laser processing subsystem 11, the acoustic wave detection subsystem 12, the image acquisition subsystem 13, the data processing subsystem 14, the alarm subsystem 15 and the control subsystem 16. The laser processing subsystem 11 is connected to the control subsystem 16 by electrical signals, and the control subsystem 16 controls the laser processing system 11 to emit laser to the surface of the workpiece to be processed, so that the surface of the workpiece generates an acoustic signal; in this embodiment, the laser processing subsystem 11 includes a workbench 111, and the workbench 111 is provided with a clamping tool. The workbench 111 can perform three-axis motion of X-axis, Y-axis and Z-axis, and the workpiece is fixed on the workbench 111 by the clamping tool.

[0069] Embodiment 2

[0070] Figure 4The flowchart of a method for online monitoring of laser shock peening quality provided in the second embodiment of the present invention is applicable to the case of online monitoring of laser shock peening quality. The method can be performed by an online monitoring system for laser shock peening quality, which can be implemented in the form of hardware and / or software. Figure 4 As shown, the online monitoring method for laser shock peening quality provided in the first embodiment may specifically include the following steps:

[0071] S110, emitting laser light to the surface of a target workpiece through a laser processing subsystem to perform laser shock peening processing on the target workpiece.

[0072] In this embodiment, in order to monitor the quality of laser shock peening of processed workpieces, an online monitoring system for laser shock peening quality provided in this embodiment is used for monitoring. The system at least includes a laser processing subsystem, an acoustic wave detection subsystem, an image detection subsystem, and a data processing subsystem.

[0073] Among them, the target processing workpiece can be understood as the workpiece to be processed for laser shock strengthening. Exemplarily, the target processing workpiece can be an aircraft engine blade disk, shaft parts, etc. The laser processing subsystem is used to emit laser to the surface of the target processing workpiece to perform laser shock strengthening processing on the target processing workpiece. Exemplarily, the laser processing subsystem can be connected to the control system electrical signal, and the control system controls the laser processing subsystem to emit laser to the surface of the target processing workpiece, so that the surface of the workpiece generates an acoustic signal. In this embodiment, the laser processing system includes a laser, a constraint layer, an absorption layer, and a workbench, and the workbench is provided with a clamping tool. Preferably, the workbench can perform three-axis motion of X-axis, Y-axis, and Z-axis, and the workpiece is fixed on the workbench by a clamping tool. The laser energy E of the laser is between 2-10J, the laser spot size is 2mm-5mm, the laser pulse width is 8ns-16ns, and the pulse repetition rate is 10Hz.

[0074] S120. During the laser shock peening process, the acoustic wave detection subsystem collects the acoustic wave signal generated on the surface of the target workpiece and transmits it to the data processing subsystem.

[0075] Continuing from the above description, when the target workpiece is subjected to laser shock peening, an acoustic wave signal is generated on the surface of the target workpiece. Based on this, the acoustic wave detection subsystem collects the acoustic wave signal generated on the surface of the target workpiece during the laser shock peening process, and sends the acoustic wave signal to the data processing subsystem, so that the digital processing subsystem can monitor the quality of laser shock peening based on the acoustic wave signal.

[0076] S130, after the laser shock peening process is completed, the three-dimensional morphology information of the target workpiece is collected by the image acquisition subsystem and transmitted to the data processing subsystem.

[0077] Considering that the existing technology does not take into account the impact of laser shock peening on material deformation when monitoring the quality of laser shock peening, especially some thin-walled materials, for example, when using laser shock peening to strengthen the integral blade disk of an aero-engine, the blades are prone to deformation, thereby reducing the quality of the blade disk; or in the laser shock peening process of shaft parts, due to the dual influence of the laser shock wave and the clamping force of the fixture, the shaft parts are prone to deformation, resulting in problems such as instability during the use of the parts.

[0078] Based on the above problems, in this embodiment, while using acoustic wave signals for quality monitoring, the deformation of the target workpiece is taken into account to determine the quality of laser shock peening. The image acquisition subsystem is used to collect three-dimensional morphology information of the target workpiece after the laser shock peening process is completed and transmit it to the data processing subsystem. Three-dimensional morphology information is information related to the deformation of the target workpiece, which can be understood as the entire three-dimensional morphology information that characterizes the target workpiece. Exemplarily, the image acquisition subsystem may include a three-dimensional morphology measuring instrument, which uses the three-dimensional morphology measuring instrument to scan the target workpiece after laser shock peening, obtain the scanned three-dimensional morphology data of the target workpiece as three-dimensional morphology information, and transmit the three-dimensional morphology information to the data processing subsystem, so that the data processing subsystem uses the three-dimensional morphology information to monitor the quality of laser shock peening.

[0079] S140, determining the laser shock peening quality of the target workpiece according to the acoustic wave signal and / or the three-dimensional morphology information through the data processing subsystem.

[0080] In this embodiment, the quality of laser shock peening of the target workpiece is determined by the data processing subsystem according to the acoustic wave signal and / or the three-dimensional morphology information. The acoustic wave signal transmitted by the acoustic wave detection subsystem and the three-dimensional morphology information transmitted by the image detection subsystem are received by the data processing subsystem. In this embodiment, there is no specific restriction on the transmission time of the acoustic wave signal and the three-dimensional morphology information. The acoustic wave signal and the three-dimensional morphology information collected in real time can be transmitted to the data processing subsystem in real time. The data processing subsystem can analyze the acoustic wave signal and / or the three-dimensional morphology information received in real time to determine the quality monitoring of laser shock peening of the target workpiece.

[0081] The process of receiving and processing the acoustic wave signal transmitted by the acoustic wave detection subsystem through the data processing subsystem can be described as: comparing the acoustic wave signal with the set standard acoustic signal. If the input acoustic signal exceeds the standard acoustic signal range, it means that the laser shock peening effect is not good; otherwise, it means that the laser shock peening effect is good. Exemplarily, the data processing subsystem calculates the input acoustic wave signal through the relevant function formula of the control program to obtain the sound pressure constant value. When the laser shock peening works normally, the sound pressure value is within a specified range. If the value is lower than this range, it means that the work quality has declined, and if the value is higher than this range, it means that there is a problem with the working state. Based on this, when the calculated sound pressure constant value is not within the standard acoustic signal range, it is determined that the laser shock peening effect is not good.

[0082] Among them, the data processing subsystem receives and processes the three-dimensional morphology information of the target workpiece transmitted by the image acquisition subsystem, and the process can be described as: comparing the three-dimensional morphology information with the set three-dimensional morphology of the standard workpiece. If the deformation of the workpiece after laser shock peening exceeds the maximum deformation value allowed by the standard workpiece, it means that the laser shock peening effect is not good; otherwise, it means that the laser shock peening effect is good. Exemplarily, the data processing subsystem coordinates the three-dimensional morphology information of the target workpiece and the three-dimensional CAD model of the standard product, performs comparative analysis, obtains the visualization result of the deformation of the entire part, and determines the deformation of the target workpiece. When the laser shock peening works normally, the deformation of the workpiece has a maximum value. If the value exceeds the maximum value, it means that there is a problem with the working state. Based on this, when the calculated deformation exceeds the set maximum deformation, it is determined that the laser shock peening effect is not good.

[0083] It should be noted that, in this embodiment, the laser shock peening effect can be determined based on the acoustic wave signal alone, or based on the three-dimensional morphology information alone, or based on both the acoustic wave signal and the three-dimensional morphology information. For example, when it is determined based on the acoustic wave signal that the laser shock peening effect is not good, then the laser shock peening effect is determined to be not good; or when it is determined based on the three-dimensional morphology information that the laser shock peening effect is not good, then the laser shock peening effect is determined to be not good; or when it is determined based on the acoustic wave signal that the laser shock peening effect is not good and based on the three-dimensional morphology information that the laser shock peening effect is not good, then the laser shock peening effect is determined to be not good.

[0084] The embodiment of the present invention provides an online monitoring system for the quality of laser shock peening, which includes: emitting laser to the surface of the target workpiece through a laser processing subsystem to perform laser shock peening on the target workpiece; collecting the acoustic wave signal generated on the surface of the target workpiece during the laser shock peening process through an acoustic wave detection subsystem and transmitting it to a data processing subsystem; collecting the three-dimensional morphology information of the target workpiece after the laser shock peening process is completed through an image acquisition subsystem and transmitting it to a data processing subsystem; determining the laser shock peening quality of the target workpiece according to the acoustic wave signal and / or the three-dimensional morphology information through the data processing subsystem. The above technical scheme takes into account the influence of laser shock peening on material deformation, detects the laser shock peening effect through the acoustic wave signal reflected on the surface of the target workpiece during the laser shock peening process, and detects the laser shock peening effect through the three-dimensional morphology information of the target workpiece after the laser shock peening is completed, combines material deformation monitoring with acoustic wave reflection monitoring, realizes comprehensive monitoring of the quality of laser shock peening, and improves the accuracy of monitoring.

[0085] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0086] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An online monitoring system for laser shock peening quality, characterized in that: include: Laser processing subsystem, acoustic wave detection subsystem, image acquisition subsystem and data processing subsystem; The laser processing subsystem is used to emit laser to the surface of the target processing workpiece to perform laser shock peening processing on the target processing workpiece; The acoustic wave detection subsystem is used to collect the acoustic wave signal generated on the surface of the target workpiece during the laser shock peening process and transmit it to the data processing subsystem; The image acquisition subsystem is used to collect the three-dimensional morphology information of the target workpiece after the laser shock peening process is completed and transmit it to the data processing subsystem; The data processing subsystem is used to determine the quality of laser shock peening of the target workpiece according to the acoustic wave signal and / or the three-dimensional morphology information.

2. The system according to claim 1, characterized in that The acoustic wave detection subsystem includes: an acoustic sensor and a data acquisition card; The acoustic sensor is used to collect the acoustic wave signal generated on the surface of the target workpiece during the laser shock peening process, and convert the acoustic wave signal into an electrical signal and transmit it to the data acquisition card; The data acquisition card is used to convert the electrical signal into a digital signal and transmit the digital signal to the data processing subsystem.

3. The system according to claim 1, characterized in that The image acquisition subsystem includes a three-dimensional shape measuring instrument, which is specifically used for: Scanning the target workpiece after laser shock peening to obtain scanning data as three-dimensional morphology information of the target workpiece; The three-dimensional shape information is transmitted to the data processing subsystem.

4. The system according to claim 2, characterized in that The data processing subsystem includes a first processing module, a second processing module and a quality detection module; The first processing module is used to compare the digital signal with a preset standard digital sound wave signal range to determine a first comparison result; The second processing module is used to compare the three-dimensional shape information with a preset standard three-dimensional shape range to determine a second comparison result; A quality detection module is used to determine the laser shock peening quality of the target workpiece according to the first comparison result and / or the second comparison result.

5. The system according to claim 4, characterized in that The quality detection module is specifically used for: If the first comparison result is that the digital signal exceeds the standard digital acoustic wave signal range, and / or the second comparison result is that the three-dimensional morphology information exceeds the standard three-dimensional morphology range, it is determined that the laser shock peening effect on the target workpiece is not good; Otherwise, it is determined that the laser shock peening effect on the target workpiece is good.

6. The system according to claim 4, characterized in that The first processing module is further used for: If the first comparison result is that the digital signal exceeds the standard digital sound wave signal range, a first warning signal is generated.

7. The system according to claim 6, characterized in that The second processing module is further used for: If the second comparison result is that the three-dimensional shape information exceeds the standard three-dimensional shape range, a second warning signal is generated.

8. The system according to claim 7, characterized in that Also includes an alarm subsystem for: When the first warning signal and / or the second warning signal is received, an alarm prompt is issued.

9. The system according to any one of claim 8, characterized in that: It also includes a control subsystem, which is communicatively connected with the laser processing subsystem, the sound wave detection subsystem, the image acquisition subsystem, the data processing subsystem and the alarm subsystem.

10. An online monitoring method for laser shock peening quality, characterized in that: The method is performed by the online monitoring system for laser shock peening quality according to any one of claims 1 to 9, and comprises: The laser processing subsystem emits a laser to the surface of the target workpiece to perform laser shock peening processing on the target workpiece; During the laser shock peening process, the acoustic wave detection subsystem collects the acoustic wave signal generated on the surface of the target workpiece and transmits it to the data processing subsystem; After the laser shock peening process is completed, the image acquisition subsystem collects the three-dimensional morphology information of the target workpiece and transmits it to the data processing subsystem; The laser shock peening quality of the target workpiece is determined by a data processing subsystem according to the acoustic wave signal and / or the three-dimensional morphology information.

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