494 results about "Peening" patented technology

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 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 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.

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 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 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 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 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.

The invention is suitable for the technical field of remanufacturing of key parts of aero-engines and gas turbines, and provides a laser strengthening composite cladding high-performance repairing method for an engine supporting plate. Comprising the following steps of pretreatment and damage evaluation, uncoated laser shock peening pretreatment, composite cladding material design and preparation, coaxial powder feeding laser cladding repair, post-treatment and performance recovery and final inspection and performance evaluation. According to the method, by means of a synergistic structure of coating-free LSP pretreatment and laser cladding, a pre-compressive stress layer pre-constructed on a base body is pretreated, tensile stress generated by rapid heating and cooling in the cladding process can be effectively counteracted, and crack initiation and extension of the interior of a cladding layer and a bonding interface are inhibited from the source; meanwhile, thermal stress accumulation is further reduced through partition staggered scanning and interlayer temperature control in S4, and the crack rate of a repaired area is remarkably reduced through the dual effects; performing performance transcendental recovery; and the method is pollution-free, high in reliability and good in manufacturability.

The present invention relates to the field of laser processing technologies for sports equipment, and specifically to a method for laser shock peening of an ice skate blade edge. The method includes the following steps: providing an ice skate blade substrate; applying an absorption layer to the blade edge of the ice skate blade substrate, wherein the absorption layer forms a rounded R-angle transition over the chamfered area of the blade edge; performing laser shock peening treatment on the blade edge coated with the absorption layer, with the laser for laser shock peening directly incident in the normal direction; performing further laser shock peening treatment on the chamfered area of the blade edge coated with the absorption layer with the laser normal to the R-angle area, using an optical focusing enhancement method; removing the coated absorption layer after the laser shock peening treatment. The purpose of the present invention is to solve the problem of deformation and delamination that occurs easily during the laser shock peening of an ice skate blade.

The invention discloses an electric arc additive thin-wall component strengthening and toughening method based on laser shock peening. The method comprises the following steps that a thin-wall test piece is prepared; planning an unstrengthened area and a plurality of laser shock strengthening sub-areas on the surface of the test piece; selecting a laser shock peening sub-region, selecting laser shock peening parameters for laser shock peening, and adjusting the laser shock peening parameters until the total thickness of the pore-free layer and the hardened layer meeting the target requirement is obtained, so as to obtain optimized laser shock peening parameters; and selecting a plurality of laser shock peening sub-regions, performing peening by adopting optimized laser shock peening, selecting annealing parameters for annealing treatment, and repeating the annealing parameter adjustment operation until the total thickness of the pore-free layer and the hardened layer meeting the target requirement is obtained, so as to obtain optimized annealing parameters. According to the method, the pore-free layer and the hardened layer with reasonable thicknesses are generated on the surface of the additive aluminum alloy thin-wall part, the near-surface layer strength of the thin-wall part is improved, and the strength and plasticity of the arc additive aluminum alloy thin-wall part are improved at the same time.

The invention provides composite laser shock peening equipment and a turbine blade laser shock peening method. The composite laser shock peening equipment comprises a first laser, a second laser, a third laser and a fourth laser, wherein the first laser outputs large-energy laser shock with single pulse energy larger than 1J to a first target area; the second laser outputs small-energy laser shock with single pulse energy at dozens of to hundreds of mJ levels to a second target area; the movement system is used for clamping and moving the to-be-machined part to the first target area or the second target area; the water restraint loading system is used for applying a water restraint layer; and the control system is used for adjusting working parameters of the modules. The invention further provides a turbine blade composite laser shock peening method implemented through the equipment, and the problem that double requirements of improvement of deep residual compressive stress and improvement of high surface residual compressive stress cannot be considered in a single process mode is solved through a large-energy and small-energy composite laser shock peening process.

The present application relates to the technical field of complex shape remanufacturing, in particular to a complex shape remanufacturing method and material for a desulfurization circulating pump impeller, the complex shape remanufacturing method comprising constructing a multi-modal damage intelligent mapping; synchronously preparing plasma activation and micro-texture; performing energy field coupling cladding repair; performing stress field balance shot peening strengthening; implementing gradient coating self-propagating synthesis; performing thermal-mechanical coupling precision shaping; performing micro-gap pressure infiltration sealing; and performing multi-physical field service simulation verification. The present application can significantly prolong the service cycle of key components, comprehensively enhance the comprehensive performance of anti-cavitation and erosion resistance, establish a digital twin closed loop of damage diagnosis, repair optimization and life prediction, and simultaneously realize life cycle cost control and resource saving. Not only can the present application repair failed components, but also can it rebuild a sustainable operation system.

A method for coating a component of a gas turbine engine includes providing the component having a bond coat and contaminants on a surface of the bond coat; laser treating the surface to remove the contaminants and to produce a cleaned surface on the bond coat; peening the cleaned surface to produce a peened surface on the bond coat, and applying a ceramic coat to the peened surface.

Provided are a technique for manufacturing an aluminum alloy member, i.e., a method for manufacturing an aluminum alloy member, and a shot peening device, whereby the fatigue strength of the aluminum alloy member can be appropriately maintained. This method for manufacturing an aluminum alloy member comprises: a step for preparing an aluminum alloy member comprising an aluminum alloy; and a step for applying residual stress to the aluminum alloy member by performing shot peening on the aluminum alloy member at a speed within the range of 1 m / s to 7 m / s when the aluminum alloy member is in contact with the shot peening member.

The present invention discloses a shot peening system and method for special-shaped workpieces, relating to the technical field of shot peening processing of special-shaped workpieces, wherein the shot peening system for special-shaped workpieces includes a mounting shaft, a shot peening device, a switching mechanism, an image acquisition module and a control module, wherein a support assembly is sleeved on the mounting shaft; the shot peening device is mounted on the support assembly; the output shaft of the switching mechanism is connected to the mounting shaft; the image acquisition module is used to acquire the contour of the special-shaped workpiece; the control module is used to control the switching mechanism to drive the mounting shaft to rotate, and drive the shot peening device to rotate with the mounting shaft through the support assembly; the present invention controls the first shot peening end or the second shot peening end of the shot peening device to face the special-shaped workpiece through the switching mechanism, and uses the first shot material and the second shot material of different particle sizes to respectively perform shot peening on the to-be-processed surface of the special-shaped workpiece, so as to adapt to the different processing requirements of the special-shaped workpiece, ensure the uniformity of the shot peening coverage of the special-shaped workpiece, and improve the flexibility and production efficiency of the shot peening processing.

The invention is applicable to the field of laser strengthening, and provides a laser strengthening method for regulating and controlling the surface performance of an additive part of a combustion chamber, which comprises the following steps: S1, pretreatment: sequentially performing stress relief annealing, surface cleaning, cleaning and drying on a metal part of the additive combustion chamber; s2, coating-free laser shock peening is conducted, specifically, the pretreated part is fixed to a five-axis workbench through a special clamp to be positioned, and Nd: YAG or Nd: YLF pulse laser is adopted for shock according to a path planned by a three-dimensional CAD model; s3, post-treatment and performance verification are conducted, specifically, after the part is cleaned, the surface appearance, roughness, residual stress and microhardness are detected, and a microstructure is observed; according to the method, the coating procedure of traditional laser shock is omitted, the pollution risk is eliminated, the surface roughness is synchronously reduced, the deep residual compressive stress is introduced, the microhardness is improved, the fatigue resistance of the combustion chamber component is remarkably improved, and the method is suitable for materials such as nickel-based high-temperature alloy and cobalt-based high-temperature alloy and components of complex structures.

A method for manufacturing high-strength, hydrogen-embrittlement-resistant bolts based on microsphere shot peening, and the bolts themselves, are disclosed. The manufacturing method includes: S1, cold heading and thread rolling of alloy structural steel billets to obtain bolt forming parts; S2, surface cleaning of the bolt forming parts, followed by overall surface peening with microspheres driven by high-pressure air; after overall peening, targeted strengthening peening treatment is performed on stress concentration areas such as thread roots, undercut grooves, and flange transition corners to obtain reinforced bolt parts; S3, the reinforced bolt parts are cleaned, dried, and phosphated to obtain finished bolt parts. This design, through a "overall + targeted" composite microsphere shot peening strategy, introduces a uniform residual compressive stress field and a micron-level fine-grained plastic deformation layer on the bolt surface, forming a thicker strengthening layer in stress concentration areas, significantly improving the fatigue strength and delayed fracture resistance of high-strength bolts, while ensuring uniform surface roughness and stable assembly friction coefficient.

The invention discloses a high-durability mask system and an application method of the high-durability mask system in mechanical shot peening selective area strengthening, and belongs to the technical field of surface engineering. The invention provides a mask design of a multi-layer composite structure, a precise positioning and fixing system and a special process parameter system. The mask plate adopts a composite structure of the matrix layer, the wear-resistant layer and the anti-fatigue layer, so that the shock resistance and the wear resistance of the mask plate are improved; the positioning system is beneficial to keeping the stability and the repeated positioning precision of the mask plate under the working condition of strong vibration; and the special process parameters are matched and optimized aiming at the application scene of the mask plate. The invention aims to improve key technical problems when a mask shielding method is applied to a mechanical shot peening process, improve the precision and efficiency of selective shot peening strengthening, reduce the comprehensive manufacturing cost, and enable the service life of a mask system and the boundary precision of a selective strengthening region to be generally superior to those of a traditional scheme. And the method has a certain economic advantage while the fatigue performance is improved.

The present application relates to the technical field of high-temperature oxidation-resistant coating, and particularly relates to a modified NiCoCrAlYTa bonding layer and a preparation method thereof.The present application adopts low-pressure plasma gas spraying to prepare a NiCoCrAlYTa bonding layer on the surface of a high-temperature alloy substrate, then performs shot peening treatment to reduce the surface roughness of the coating, then performs Al-Cr co-diffusion, and forms a co-diffusion bonding layer with an outer Al-rich layer, an intermediate Cr-rich layer and an inner NiCoCrAlYTa layer, finally performs vacuum pre-oxidation to form a TGO layer on the surface of the co-diffusion bonding layer, thereby obtaining the modified NiCoCrAlYTa bonding layer.The modified NiCoCrAlYTa bonding layer prepared by the present application has excellent high-temperature oxidation resistance and corrosion resistance, and can realize long-time service.

The invention discloses a fatigue crack propagation life prediction method for a laser shock peening titanium alloy lug, and belongs to the technical field of fatigue crack propagation life prediction of a metal structure, and the method comprises the following steps: carrying out laser shock peening on a target lug structure, and testing to obtain a residual stress field of the target lug structure after laser shock peening; carrying out a fatigue test by adopting an identification load method, and interpreting a fracture; stress intensity factors caused by external loads and residual stress of all points of the front edge on the marking line are calculated in finite element numerical simulation software; correcting the fatigue crack growth rate model; calculating a crack propagation amount corresponding to each point of the preset crack front edge based on the fatigue crack propagation rate model, fitting to obtain a new crack front edge, and recording a corresponding cycle index; and calculating to obtain the fatigue crack propagation life. By adopting the method, accurate prediction of the three-dimensional fatigue crack propagation life under the action of the laser shock peening residual compressive stress field is realized.

A processor (213) carries out, after a device is activated and before a blasting medium projected to a projection target object (500), a first inspection process (T1) for determining, in a state in which no blasting medium (400) is supplied to an impeller (110) while each motor of the impeller is rotating, whether a current value supplied to the each motor of the impeller is not more than a first threshold (θ1), and a second inspection process (T′1) for determining, in a state in which the impeller is projecting the blasting medium, whether the current value supplied to the each motor of the impeller is not less than a second threshold (θ2), and displays, on a display (300), at least one of (1) respective determination results of the first inspection process and the second inspection process and (2) a determination result obtained by generalizing the determination results (1).