628 results about "Peening" patented technology

The invention belongs to the application of a computer technology in the field of shot blasting processing, and discloses a shot blasting strength calculation method and system based on control parameters of intelligent shot blasting equipment. According to the method, an intelligent calculation method system is constructed by establishing a prediction model of the control parameters and the shot blasting strength. According to the method, nozzle pressure, moving speed, spraying angle, shot flow and target distance parameters of shot blasting equipment are collected in real time, workpiece material attribute data are combined, a multi-dimensional data fitting algorithm is adopted for processing, and an accurate shot blasting strength value is output. Meanwhile, a self-adaptive parameter adjusting module is developed, and dynamic calculation optimization can be carried out according to residual stress field distribution and coverage rate requirements. Compared with a traditional Almen test piece method, the method achieves real-time calculation of shot blasting strength and closed-loop control of technological parameters, the calculation error rate is reduced to be within 5%, test piece consumption is reduced by 80% or above, machining efficiency and quality stability are remarkably improved, and an innovative solution is provided for intelligent manufacturing in the field of surface strengthening.

The invention discloses a metal fatigue life prediction method under laser shock peening, and relates to the technical field of metal material fatigue life prediction. The invention discloses a metal fatigue life prediction method under laser shock peening. The metal fatigue life prediction method comprises the following steps of roughness model construction, roughness evolution simulation, roughness value calculation, material attribute endowing and fatigue life prediction. According to the method, the real surface is subjected to laser shock peening, the roughness evolution condition of the metal surface subjected to laser shock peening is accurately predicted, and then the fatigue life is predicted by adopting a method of combining a Basic-Manson-Coffin formula and continuous damage mechanics. The method fully considers the local complex stress-strain state under the evolution of the roughness surface microstructure after laser shock peening, truly simulates the fatigue progressive damage process of the sample after comprehensive consideration of laser shock peening, and can effectively improve the prediction precision of the fatigue life of the metal after laser shock peening.

The invention discloses a TiAl alloy electron beam selective melting and shot peening strengthening in-situ compounding manufacturing method and device, and relates to the technical field of additive manufacturing. The method comprises the following steps: establishing a three-dimensional digital model of a to-be-printed part, and performing slicing and layering to obtain layered scanning data; under the vacuum condition, TiAl alloy powder is spread on the preheated base plate according to the set thickness, and a powder bed is formed; according to the layered scanning data, scanning and melting the powder bed through a focused electron beam, completing single-layer scanning and melting, completing scanning and melting layer by layer until the part is printed and cooled, and recovering unmelted TiAl alloy powder; and under the vacuum condition, the surface of the printed part is scanned and heated through a defocusing electron beam, TiAl alloy powder is adopted as shot blasting powder, the surface of the heated part is subjected to microparticle shot blasting strengthening treatment, after the treatment is finished, cooling is conducted, scattered shot blasting powder is recycled, and the finished TiAl alloy part is obtained. By means of the collaborative process design of electron beam selective melting and in-situ high-temperature microparticle shot blasting and device integration, the problems that in TiAl alloy additive manufacturing, cracking is prone to occurring, and the strengthening effect is poor are solved.

The invention discloses an aero-engine blade laser shock remanufacturing method based on digital twinning, and belongs to the field of deep transfer learning, and the method comprises the steps: collecting cutting force, vibration, temperature and other multi-modal data for the non-uniform stress distribution caused by tool wear, and constructing a monitoring system; and feature alignment is performed on different working condition data by using a maximum mean difference method, a wear diagnosis and stress prediction model is constructed in combination with deep transfer learning, and a stress concentration area is identified. And laser shock strengthening remanufacturing is implemented in a stress concentration area, shock parameters are optimized, a small sample data set is expanded in combination with an adversarial generative network, and the remanufacturing adaptability is improved. Incremental transfer learning is adopted, the model is dynamically adjusted based on a freezing-fine adjustment mechanism, and rapid optimization under the new working condition is achieved. The blade residual stress control precision and the machining stability are improved by firstly monitoring tool wear and stress distribution, then implementing laser shock peening and optimizing a remanufacturing strategy in combination with incremental transfer learning.

The invention relates to the technical field of residual stress regulation and control of castings, in particular to a device and a method for regulating and controlling residual stress of a casting after heat treatment. In order to solve the problem that a common method for regulating and controlling the residual stress of the casting after heat treatment is poor in regulating and controlling effect on a stress concentration area or internal residual stress of the casting, the invention provides a device and a method for regulating and controlling the residual stress of the casting after heat treatment. The vibration aging mechanism comprises a vibration reduction platform, an elastic cushion and a vibration exciter, and the elastic cushion is fixed to the upper surface of the vibration reduction platform; the shot peening strengthening mechanism comprises two linear modules, two six-axis mechanical arms and two shot peening assemblies, the two six-axis mechanical arms are fixed to the two linear modules correspondingly, each shot peening assembly comprises a shot peening pipe, and the shot peening pipes are fixed to the tail ends of the six-axis mechanical arms. During use, the vibration aging mechanism and the shot peening strengthening mechanism are used for carrying out synchronous coupling regulation and control on the casting. The regulation and control device is simple in structure and convenient to operate.

The invention discloses a thin-wall stainless steel pipe welding seam polishing device, and belongs to the technical field of metal processing machine tools, the thin-wall stainless steel pipe welding seam polishing device comprises a main shaft, a through hole used for containing a thin-wall steel pipe to be polished is formed in the middle of the main shaft, a clamping groove is formed in the circumferential side wall of the through hole, and an electromagnetic strip is movably embedded in the clamping groove; and the ejector rod is coaxially opposite to the through hole and is driven by an ejector rod sliding table to be horizontally close to or far away from the main shaft. By means of the highly-integrated dual-mode power relay part, integration and rapid lossless switching of the grinding function and the ultrasonic peening function are achieved, the two working procedures are combined into one, the production efficiency is greatly improved, and positioning errors caused by multiple times of clamping are avoided.

The invention provides a method for automatically detecting the coverage rate of a blade part after shot blasting, which realizes objective evaluation and screening of the surface coverage rate of the part based on an intelligent platform, and comprises the following steps: S1, establishing a database for comparison through sample coverage rate calibration; s2, performing shot blasting treatment on the part to form a to-be-detected surface; s3, the part subjected to shot blasting treatment is fixedly arranged in a designated area and transferred to a detection platform; s4, carrying out image acquisition on the shot blasting area of the part by adopting intelligent visual equipment; s5, comparing the acquired image with a calibration picture in a database through image analysis software, and judging a coverage rate value of the part; and S6, re-checking and post-processing the judgment result, and screening out qualified parts. According to the method, the roughness of parts such as blades after shot blasting can be quantitatively detected, and the coverage condition of the parts after surface treatment can be more objectively judged; the detection efficiency can be improved, and the problem of missing detection can be effectively avoided.

The invention provides a shot peening process parameter optimization and generation method and device, equipment and a storage medium. The shot peening process parameter optimization method of a thin-wall component comprises the steps that initial state data of the thin-wall component is obtained; generating a multilayer constitutive model; initial shot blasting process parameters are obtained; a geometric model after shot blasting and residual stress distribution data after shot blasting are predicted through shot blasting simulation; shot blasting forming efficiency is obtained according to the initial shot blasting process parameters; the residual stress gradient uniformity is obtained according to the residual stress distribution data after shot blasting; and optimal shot blasting process parameters are obtained through multi-objective optimization. According to the shot peening process parameter optimization and generation method and device, the equipment and the storage medium, the shot peening forming efficiency and the stress distribution uniformity can be both considered.

The invention relates to the technical field of shot blasting protection, in particular to an aperture-adjustable shot blasting modular protection device and method, which comprises a double-end threaded pull rod, a variable-diameter supporting mechanism positioned on the double-end threaded pull rod, blocking pieces positioned at two ends of the variable-diameter supporting mechanism, and an adjusting piece in threaded connection with the double-end threaded pull rod, the variable-diameter supporting mechanism is used for supporting the inner wall of a hole, and rotation of the adjusting piece is used for adjusting the supporting range of the variable-diameter supporting mechanism. The blocking pieces are detachably connected to the two ends of the variable-diameter supporting mechanism and used for blocking the opening portion of the hole. The variable-diameter supporting mechanism is driven by the adjusting piece to adapt to different hole diameters, various hole types are compatible and adapted, the universality of the protection equipment is greatly improved, and the cost is reduced; disassembly and assembly are convenient and efficient, shot blasting operation auxiliary time is shortened, and machining efficiency is improved; the modular design facilitates independent replacement of damaged parts, the maintenance cost is reduced, and the service life of the device is prolonged.

The invention provides a shot peening inherent strain reverse calculation method and system based on unequal-thickness thin plates. The method comprises the steps that unequal-thickness calibration samples are prepared; technological parameters to be calibrated are selected, and shot blasting is conducted on the calibration sample; measuring the profile of the center line of the shot-blasted surface of the calibration sample after shot blasting; calculating the surface ductility and the bending curvature according to the contour of the center line of the sample; based on the surface ductility and the bending curvature, the inherent strain corresponding to the to-be-calibrated process parameters is reversely solved. According to the method, the inherent strain is reversely solved based on the multi-deformation geometric parameters, compared with an inherent strain reverse solving method based on residual stress, the reverse solving efficiency is higher, the robustness and the accuracy are better, and meanwhile the problem that the inherent strain is reversely solved based on a single deformation parameter is uncertain is solved; and a method support is provided for construction of a shot blasting inherent strain process database.

The invention discloses a laser wire feeding additive-layer impact peening composite manufacturing device and method, and the device comprises an additive manufacturing module, an environment control module, a movement conversion module, an impact peening module and an integrated control system. The integrated control system is connected with the additive manufacturing module, the environment control module, the movement conversion module and the impact strengthening module through signal lines, state signals of all the modules are collected and analyzed in real time, operation instructions are given according to the preset process and logic, and it is ensured that all the modules are tightly matched and efficiently run. The advantages of the laser coaxial wire feeding technology and synchronous layer-by-layer laser shock peening are combined, the workpiece forming quality and precision are guaranteed, meanwhile, the macromechanical property of a workpiece is improved, in the laser shock peening process, a common flowing water limiting layer is abandoned, the electric shock risk caused by the flowing water limiting layer and the pollution problem to the workpiece are avoided, and the production efficiency is improved. The simplicity and the safety of the manufacturing device are obviously improved, and the production efficiency and the operation convenience are improved.

The invention belongs to the technical field of metal material mechanical property research, and discloses a gear shot peening tooth surface residual stress calculation method and system.The method comprises the steps that a shot speed calculation model in the gear shot peening process is built, shot peening process analog simulation is carried out, and dynamic information of collision between shots and a tooth surface is output; the projectile speed is converted from a machine tool coordinate system to a local coordinate system; establishing a sprayed target plate model and a projectile model, dividing grids, and assembling the grid-divided projectile model and the sprayed target plate model to construct a random multi-shot finite element geometric model; and performing finite element simulation calculation on the random multi-shot finite element geometric model, and outputting residual stress distribution of the gear. According to the method, computational fluid mechanics and a discrete element method are coupled, a high-precision calculation model of the shot speed in the gear shot blasting process is constructed, the forming mechanism and distribution characteristics of the tooth surface residual stress in the actual shot blasting process are effectively reflected, and the method is good in economical efficiency, high in simulation precision, high in process executability and closer to engineering practice.

The invention provides a method for composite manufacturing of a ribbed wallboard structure through friction stir solid phase additive and needleless friction stir, which comprises the following steps: firstly, manufacturing a reinforcing rib structure on a substrate layer by layer through a friction stir additive manufacturing process, and meanwhile, carrying out friction stir treatment on a deposition layer by using a needleless stirring head; therefore, the reinforcing rib generates plastic deformation at the recrystallization temperature, the reinforcing rib and the matrix structure are combined more tightly, meanwhile, the surface roughness of the reinforcing rib is further reduced through needle-free stirring, grains are refined, and the overall strength of the reinforcing rib is improved. And finally integrally forming the part through a shot blasting forming process. According to the method, the problems that a reinforcing rib structure made of dissimilar materials cannot be manufactured through a traditional method, and a ribbed integral wallboard is difficult to integrally form are solved, redundant machining is avoided, the forming cost of the ribbed wallboard structure is reduced, meanwhile, the bonding strength between the reinforcing rib and a base body is further improved through needle-free stirring, and the production efficiency is improved. And the performance of the wallboard structure can be better improved.

A needle-peening method of peening a weld toe of a welded joint for welding and joining two pieces of sheet metal using a peening pin includes vibrating one or a plurality of the peening pins in a center axis direction; rotating the one peening pin about a single rotation axis parallel to the center axis while the center axis of the one peening pin is offset from the rotation axis, when using the one peening pin; rotating the plurality of the peening pins about the rotation axis, when using the plurality of the peening pins; and moving the one or plurality of the peening pins along the welding direction to peen the weld toe, wherein a radius of curvature of a cross section perpendicular to a welding direction at a distal end part of the peening pin is equal to or larger than 0.05 mm and smaller than 1.00 mm.

The invention relates to the technical field of surface microstructure preparation, in particular to a preparation method of an ultrahigh-strength steel surface texture, which comprises the following steps: determining that texture units meeting the wear resistance are cylindrical pits according to the wear resistance bionics principle; according to a hydrophobic mechanism, forming a basic texture by using a plurality of texture units with different sizes in a concentric circle distribution form; and a plurality of basic textures distributed in a set arrangement mode are machined on the surface of the ultrahigh-strength steel base body through the laser shock peening technology. The preparation method of the ultrahigh-strength steel surface texture aims at solving the problem that it is difficult to improve the corrosion resistance and the abrasion resistance of the surface of an ultrahigh-strength steel base material at the same time.

The invention discloses a laser shock and laser powder feeding combined high-strength aluminum alloy repairing method and application, and belongs to the technical field of material processing and repairing. A high-strength aluminum alloy part to be repaired is subjected to nondestructive testing, and to-be-damaged information is obtained; laser powder feeding printing equipment and ultrafast laser shock peening equipment are debugged; alloy powder is selected, and rare earth elements are added to the high-strength aluminum alloy for fine adjustment of alloy powder components; according to the damage information, a variable power scanning and path adjusting strategy is adopted for laser powder feeding, printing and repairing; after laser powder feeding printing is completed, a shared high-precision motion control system is used for positioning a laser beam of ultrafast laser shock peening equipment to the to-be-repaired area where laser powder feeding printing is completed, and ultrafast laser shock peening treatment is conducted; and repairing is completed. The problems that a traditional repairing method is large in heat input amount, serious in structure change, prone to deformation, residual stress, air holes, cracks and the like are solved, the repairing efficiency is improved, and the repairing cost is reduced.

The invention discloses a welding repair method for cracks of a main frame of a 20Mn5 cast steel cone crusher, which comprises the following steps of: cleaning rust, dirt and oil dirt, punching a 65-80-degree double-groove and removing an oxide layer, using a high-strength and high-plasticity welding material and a direct-current welding machine, performing direct-current reverse connection, controlling the welding current to be 82.5-87.5 A and the electric arc length to be 1.2-1.8 mm, adopting a multi-layer welding mode, performing linear reciprocating operation on a first layer of welding bead, and performing welding on a second layer of welding bead and a third layer of welding bead, so as to repair the cracks of the main frame of the 20Mn5 cast steel cone crusher. And after the five layers of welding beads are welded, welding sine curves to strengthen the welding beads by taking a connecting line between the starting point and the ending point of the welding seam as a central line, preheating at 275-295 DEG C before welding, preserving heat at 210-230 DEG C for about 1.5 hours after welding, and carrying out shot peening hardening on ceramic shots of an ultrasonic flaw detector and the welding seam. According to the method, a high-strength and high-plasticity welding material and proper temperature control conditions are selected and used, welding cracks and welding deformation are effectively prevented, the tensile strength of a welding seam reaches 890 MPa and is higher than the tensile ultimate strength 785 MPa of 20Mn5, and welding repair of cracks of the main rack of the 20Mn5 cast steel cone crusher is met.

The invention relates to the technical field of metal material strengthening treatment, in particular to a micropitting-resistant wind driven generator gear carburizing and quenching composite strengthening process which comprises the following steps: S1, gear blank pretreatment and surface activation; s2, gradient carburizing strengthening treatment; s3, grain refinement annealing treatment; s4, step quenching strengthening treatment; s5, performing deep cooling and thermal cycle treatment; s6, directional tempering regulation and control treatment; s7, composite shot peening strengthening treatment is conducted; and S8, an antifriction composite film layer is deposited on the surface of the gear subjected to shot peening strengthening in the S7. According to the method, through a synergistic strengthening mechanism of gradient carburization, step quenching, structure regulation and control and surface functionalization, the residual stress distribution and tribological performance are optimized while the high surface hardness of the gear is kept, and the technical problems that in a traditional technology, the carburized layer is concentrated in stress, uneven in structure, single in surface performance and the like are solved.

The invention discloses a method for strengthening a nanocrystalline material through laser shock, belongs to the field of metal material laser shock processing, and aims at solving the problem that the application field of an existing nanocrystalline material is limited due to the fact that the mechanical property of the existing nanocrystalline material is poor. Laser pulses penetrate through the restraint layer transparent material to directly reach the ablation layer, the ablation layer instantaneously absorbs high-energy-density pulse lasers and instantaneously vaporizes and ionizes the high-energy-density pulse lasers to form high-energy shock waves, the peak pressure of the shock waves is instantaneously increased under the limitation of the restraint layer and can reach the GPa level, a large number of defects are introduced into the nanocrystalline foil, and therefore the high-energy-density nanocrystalline foil is obtained. Therefore, the nanocrystalline material is strengthened. The method is mainly used for surface strengthening of nanocrystalline materials.

The invention discloses a method, a device, equipment, a medium and a product for determining a shot peening forming process scheme, and the method comprises the following steps: constructing a geometric part digital model for a target part, applying a corresponding equivalent heat source model to the geometric part digital model at a shot peening path of a current scheme, and carrying out reverse simulation deformation calculation based on a material shrinkage parameter, obtaining a plate part mathematical model; calculating the weight of each node of the digital model based on the part thickness information and the flatness index value of the flat plate part digital model, and returning to the operation of obtaining the current scheme until all the schemes are processed; and according to the flatness index values, a target shot peening forming process scheme is obtained. Starting from the shape of the target part, reverse calculation is carried out through the equivalent heat source model and the shrinkage parameters, and the digital model of the flat plate part can be generated more accurately. Through the flatness judgment method of the weight of the part thickness information, all the process schemes are sequentially processed, the simulation result can be quantitatively evaluated, and the accuracy and reliability of shot peening forming process scheme selection are improved.

The invention relates to a shot peening method for strengthening the mechanical property of a laser additive manufacturing titanium-based composite material, which comprises the following steps of: performing single-pass shot peening on the surface of the titanium-based composite material under the conditions that the air pressure is 0.1-0.25 MPa and the shot peening time is 3-10 minutes, and removing residual shots on the surface of the titanium-based composite material after the shot peening is finished, the tensile strength of the reinforced titanium-based composite material at the room temperature is improved by 50-100 MPa from 1152.76 MPa in an initial printing state. According to the shot blasting treatment provided by the invention, residual compressive stress is introduced by bombarding the metal surface through small particles, the surface structure is subjected to plastic deformation, grains on the outermost surface are remarkably refined, and the mechanical property of the titanium-based composite material manufactured by laser additive manufacturing is effectively improved at low cost.

The invention relates to the field of laser processing, and particularly discloses a fillet structure laser shock peening residual stress control method based on energy compensation, which comprises the following steps: accurately measuring and quantifying residual stress fluctuation and a tensile stress area caused at a fillet in the prior art, and setting a peening target according to the residual stress fluctuation and the tensile stress area; laser parameters and geometric parameters are systematically identified, and a database covering the combination of the laser parameters, the geometric parameters and material parameters and corresponding residual stress results is constructed through experiments and simulation; and based on the constructed database, establishing a relationship between parameters and stress, and obtaining a simplified empirical formula for laser energy compensation from the relationship. The energy control formula extracted by the control method can accurately guide processing parameters with different geometrical characteristics, so that the uniformity of residual stress distribution is fundamentally ensured, and harmful tensile stress at the fillet is effectively eliminated. Through accurate control of an empirical formula, raw materials and working hours consumed by repeated trial and error in a traditional process are avoided.

The invention belongs to a part surface treatment technology, and relates to an actuator cylinder inner surface ultrasonic impact strengthening device and a use method thereof. Comprising an actuator cylinder upper cover plate (1), an actuator cylinder supporting table (2), an ultrasonic vibration head fastening screw (3), an ultrasonic impact device, an ultrasonic vibration head supporting platform (6), an ultrasonic working rotary table (8), a vertical lifting working table (9) and an ultrasonic strengthening working table base (10). According to the method, only a small amount of shots are consumed and are far less than traditional shot peening strengthening, the machining cost is lower, the dust amount is smaller, and noise is lower. In the strengthening process, a tool and actuator cylinder parts do not need to be moved, all the inner surfaces of the actuator cylinders are strengthened only through rotation of the ultrasonic working rotary table and lifting of the vertical lifting working table, high positioning precision is achieved, and the machining efficiency is remarkably improved.

The invention discloses a method for strengthening titanium alloy through physical vapor deposition assisted laser shock. The method comprises the steps that a first NiZn layer is deposited on the surface of the titanium alloy through magnetron sputtering; depositing a first NiAl layer on the surface of the first NiZn layer through magnetron sputtering; depositing a second NiZn layer on the surface of the first NiAl layer through magnetron sputtering; a second NiAl layer is deposited on the surface of the second NiZn layer through magnetron sputtering, and the to-be-strengthened coated titanium alloy is obtained; carrying out laser shock fatigue strengthening on the coated titanium alloy to be strengthened; wherein the content of Ni in the first NiZn layer is different from that of Ni in the second NiZn layer, the content of Ni in the first NiAl layer is different from that of Ni in the second NiAl layer, the thickness of the first NiAl layer is at least 100 nm larger than that of the first NiZn layer, the thickness of the second NiZn layer is at least 100 nm larger than that of the first NiAl layer, and the thickness of the second NiAl layer is at least 100 nm larger than that of the second NiZn layer.

The invention particularly relates to an electromagnetic induction heating-assisted laser shock peening method suitable for a complex curved surface, which comprises the following steps: evaluating a surface to be processed, and carrying out block division and path planning according to the curvature of the surface to be processed; determining technological parameters of laser shock peening and electromagnetic induction heating; selecting and installing an induction heating coil; adjusting the posture of the device to enable the laser outlet and the coil to adapt to the surface of the processing area; coating an absorbing layer, and starting an electromagnetic induction device to preheat a processing area; carrying out laser shock peening assisted by electromagnetic induction heating; part surface state real-time monitoring and device posture adjustment; and checking the processing effect until all the blocks are processed. According to the processing method for block division, path planning and surface condition real-time monitoring to guide attitude adjustment, surface temperature uniformity can be ensured when curved surfaces with irregular shapes are processed, and three types of scanning strategies are provided for different types of curved surfaces, so that the processing effect is enhanced.

The invention relates to the field of foundation detection, in particular to an impact-controllable foundation strength detection device and method for building construction, and the device comprises a steel chisel main body, an annular transmission block, a piercing hammer and a coaxial release mechanism; the coaxial releasing mechanism comprises a coaxial connecting ring, a plurality of force applying structures and a buffering assembly, the coaxial connecting ring is coaxially connected with the steel chisel body, a plurality of lifting lugs are arranged on the coaxial connecting ring at equal intervals, the force applying structures are arranged on the lifting lugs correspondingly, the force applying structures are used for applying radial acting force to the piercing hammer, and the buffering assembly is used for buffering the piercing hammer. The acting force applied to the piercing hammer by the force application structures is the same in magnitude, and the buffer assembly is connected with the coaxial connecting ring and the steel chisel body and used for reducing vibration borne by the coaxial connecting ring. The steel chisel is provided with the steel chisel body, the piercing hammer and the coaxial release mechanism, so that energy loss caused by eccentricity or contact friction of the piercing hammer is avoided, and the impact amount of the piercing hammer is precisely controllable.

The invention discloses a turbine disc alloy fatigue life prediction method considering residual stress relaxation evolution, which comprises the following steps: determining the size of a notch-containing simulation part of a turbine disc, and carrying out size optimization based on a dangerous point and a stress gradient; establishing a three-point bending finite element model, simulating a residual stress field and a work hardening field introduced by laser shock peening (LSP), and obtaining stress-strain states after a first period and a stable period through cyclic loading; compared with the prior art, the fatigue life prediction method has the advantages that by introducing the stress-strain state after the residual stress field is stabilized and combining a Walker index correction model, the problem of prediction deviation caused by neglecting subsequent relaxation in a traditional method is solved, the fatigue life margin is accurately evaluated, and the fatigue life prediction accuracy is improved. And an optimization basis is provided for the design of the turbine disc, so that the service cycle is prolonged within a safety threshold.

The invention provides a spiral bevel gear composite shot blasting process parameter optimization method and optimization system based on discrete element-finite element analysis, and relates to the technical field of gear parameter optimizing.The method comprises the specific steps that process parameters are generated through random combination and input into a model for simulation; acquiring residual stress distribution, stress gradient and crack characteristic data of the spiral bevel gear; constructing a parameter prediction model, and training the model by using a simulation result; inputting an initial parameter to obtain a performance index; calculating a stress uniformity coefficient and a crack risk coefficient, and generating a comprehensive evaluation coefficient through correlation analysis to evaluate the surface quality of the gear; and with maximization of the comprehensive evaluation coefficient as a target, iterative optimization is carried out on the parameters by using a genetic algorithm, and optimal process parameters are extracted. According to the method, the interaction effect between the composite shot blasting process parameters can be comprehensively considered, then the composite shot blasting process parameters can be optimized, it is ensured that the performance of the spiral bevel gear is optimal in use, and the failure risk is reduced.

The invention relates to the field of laser shock peening, and particularly discloses a laser shock peening black adhesive tape damage monitoring method based on sound signals, which comprises the following steps: collecting laser shock discrete sound signals, obtaining a discrete sound signal sequence, and carrying out Hilbert envelope extraction on the discrete sound signal sequence to obtain envelope signals; performing weighting processing on the extracted envelope signal to obtain a weighted envelope, and constructing a loudness index based on the weighted envelope; short-time window frequency analysis is adopted, a dominant frequency sequence with the dominant frequency changing along with time is extracted, and the dominant frequency stability offset is calculated according to the dominant frequency sequence; and constructing a loudness-frequency coupling damage scoring criterion, and calculating a damage score. According to the method, the damage identification sensitivity is remarkably improved, the real-time online monitoring of the laser shock process is realized, the environmental adaptability is high, the engineering deployment is simple and convenient, the consistency of the laser shock peening quality is remarkably improved, and meanwhile, the method has good expandability and universality.

The invention discloses a device and method for monitoring the state of a laser shock peening absorption layer, and relates to the technical field of surface strengthening, and the device comprises a visual image sensor array, an image preprocessing module, an image analysis module and a state evaluation module. The visual image sensor array is used for acquiring visible spectrum images and near-infrared band images of a laser shock peening processing area from multiple angles; the image pre-processing module is used for pre-processing the acquired images to obtain pre-processed images at different angles; the image analysis module is deployed with an image recognition model based on a ResNet-UNet hybrid architecture and an attention mechanism, and is used for recognizing the preprocessed image to obtain an image analysis result; and the state evaluation module is used for evaluating by adopting a multi-threshold judgment mechanism according to the image analysis result to obtain an evaluation result. The state change of the absorption layer in the laser shock peening process can be monitored in real time, the damage condition can be found in time, and the stability and consistency of laser shock peening machining are effectively improved.