423 results about "Shot 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 method for improving the high-cycle fatigue performance of a Ti6Al4V titanium alloy, and belongs to the technical field of metal material processing, and the method comprises the following steps: S1, determining shot peening strengthening parameters based on material performance parameters and related standards; according to the method, high-amplitude residual compressive stress is introduced through shot peening strengthening, the stress state of the surface and the depth direction of the material is changed, accordingly, crack extension can be restrained, the fatigue life is prolonged, in addition, a plastic deformation layer is induced to be generated under the surface depth in the shot peening process, the microstructure of the material is improved, and the anti-fatigue performance of the material is improved; through femtosecond laser shock, surface defects can be effectively removed, the surface compactness can be improved, microcracks can be reduced, and a refined grain structure can be generated, so that the strength and toughness of the material are further enhanced, the high-cycle fatigue performance of the material is further improved, the two are combined, the residual stress state is optimized, and the surface integrity is improved. The fatigue performance of the Ti6Al4V titanium alloy is remarkably improved.

The invention belongs to the technical field of metal part surface modification, and relates to a composite strengthening method for a carburized surface of a high-bearing gear of an aero-engine. According to the method, high-hardness and high-density ceramic shots are adopted as media for high-energy mechanical shot peening strengthening, the advantage that the subsurface strain hardening effect of the contact strengthening technology is good and the barb-shaped distribution characteristic of mechanical shot peening residual compressive stress are utilized, extremely high residual compressive stress is introduced to the subsurface position, and the contact fatigue performance of the tooth surface of the gear is improved. High-frequency laser shot peening strengthening is used for secondary treatment, so that the surface layer of the material is subjected to plastic deformation, high-amplitude residual compressive stress is introduced into the surface layer of the material within the depth range of more than 500 microns by utilizing the advantage of large influence depth of laser-induced shock waves, and the residual compressive stress can inhibit fatigue crack initiation, has a certain depth and inhibits fatigue crack propagation; and the bending fatigue resistance of the root of the gear can be effectively improved. And an abrasive flow process is adopted, so that the roughness is reduced to be more than 0.4 mu m.

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 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 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 discloses a metal dust processing cyclone type wet dust collector and an intelligent control system thereof. The cyclone type wet dust collector for metal dust processing comprises a box body, a multi-stage filtering device, a dust recovery device and an intelligent control device, the box body is provided with an exhaust inlet and an air outlet; a multi-stage filtering device is arranged in the box body and comprises a water curtain filtering area, a spraying pressing area and a water mist separation area which are arranged in sequence; the dust recovery device comprises a sewage treatment tank and an air locking and dust discharging device which are arranged at the bottom of the box body; the intelligent control device is used for monitoring water level, water flow, water pressure, temperature and air pressure difference parameters and automatically controlling the operation state of the system according to monitoring results. The intelligent control system is applied to the dust remover. The dust removal device has the following beneficial effects that through multi-stage filtration and intelligent control, the problems of low efficiency, poor safety, difficulty in maintenance and low automation degree when existing dust removal equipment is used for treating sand blasting and shot blasting dust are solved.

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, 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 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 quality prediction method and system in the shot blasting treatment process of a brake drum, and relates to the technical field of data processing, and the method comprises the steps: obtaining a to-be-treated area and a qualified coverage rate threshold value, obtaining a shot launching number, obtaining a shot blasting time period, and obtaining shot blasting starting time and shot blasting ending time; acquiring a real-time surface image of the surface to be subjected to shot blasting treatment of the brake drum in the shot blasting treatment process, and acquiring a real-time coverage rate according to the real-time surface image; judging whether the real-time coverage rate is smaller than a qualified coverage rate threshold, if so, obtaining a first quality prediction result according to the real-time coverage rate, and if not, obtaining a coverage rate difference value between the qualified coverage rate threshold and the real-time coverage rate; and obtaining a change weight based on the coverage rate degree change model and the coverage rate difference value, and obtaining a second quality prediction result according to the change weight, the shot peening treatment time, the real-time coverage rate and the shot peening end time. The method has the advantages of high prediction efficiency, dynamic prediction, accuracy and reliability.

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 discloses a surface strengthening process capable of improving the high-cycle fatigue performance of a TiAl alloy casting, which is characterized by comprising the following steps of: 1, carrying out sand blasting treatment on the casting with the mesh number of 40-120; secondly, dirt on the surface of the casting obtained in the first step is removed; and thirdly, shot blasting treatment is conducted on the casting obtained in the second step, and the shot blasting strength ranges from 0.1 mmN to 0.3 mmN. In the first step, the fatigue strength of the casting after sand blasting can reach the level of a standard smooth sample by reasonably selecting the mesh number of sand blasting sand, and then in the second step, the fatigue strength of the casting after sand blasting and shot blasting can be remarkably improved compared with that of the standard smooth sample by reasonably selecting the shot blasting strength. The surface strengthening process disclosed by the invention is simple, short in flow, low in requirements on production equipment and simple and convenient to operate, can be applied to high-temperature rotating parts such as aero-engine low-pressure turbine blades and automobile engine impellers, and has great application and popularization values.

The invention relates to the technical field of metal casting, and discloses a production method of a high-toughness lightweight riveting nut, which comprises the following steps: step A, material selection and alloying treatment; step B, precision forming; c, surface strengthening treatment; step D, intelligent riveting process; and step E, quality detection and a feedback mechanism. According to the invention, the high-strength aluminum alloy containing magnesium, zinc, copper and other trace elements is selected as a base material, and accurate alloying treatment is carried out, so that the microstructure and mechanical properties of the material are optimized, and the hardness and deformation resistance of the material are remarkably improved; in the surface strengthening treatment stage, means such as shot peening strengthening, carburizing treatment and an ion implantation technology are adopted, a vacuum carburizing technology is introduced, and a high-energy ion beam is adopted for surface strengthening, so that the hardness, the wear resistance and the corrosion resistance of the surface of the riveting nut are remarkably improved.

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.

The present invention provides a method for manufacturing a non-stick cooking utensil, the method comprising the following steps: preparing a blank of the non-stick cooking utensil; simultaneously spraying a perovskite material and a ductile metal material onto the blank of the non-stick cooking utensil via different spray guns by means of plasma spraying to form a non-stick coating; and performing shot peening on the non-stick coating to obtain the non-stick cooking utensil, wherein the perovskite material is represented by ABO3, A comprises at least one of alkaline earth metals, B comprises at least one of transition metals, and wherein the elongation at break of the ductile metal material is greater than or equal to 12%. Therefore, by using the plasma spraying method with dual spray guns, a non-stick cooking utensil with effects such as stable material quality, high hardness, high temperature resistance, and long non-stick life can be achieved.

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 provides a shot peening simulation test piece fixing device for aero-engine parts, and relates to the technical field of aero-engine manufacturing, the shot peening simulation test piece fixing device comprises a base, the surface of the base is provided with a plurality of first T-shaped grooves, and the plurality of first T-shaped grooves are circumferentially arranged on the surface of the base; the stand columns are vertically arranged on the first T-shaped grooves respectively, and the ends of the stand columns are connected with the first T-shaped grooves in a sliding mode; a second T-shaped groove is formed in the surface of the stand column in the axial direction. Each second T-shaped groove is connected with the corresponding sliding support in a sliding mode; the plurality of stand columns are divided into a first group of stand columns and a second group of stand columns according to use requirements, the rotating support is arranged on the sliding support on the first group of stand columns, the rotating support is rotatably connected with the sliding support, and a test piece placing seat is arranged on the rotating support, so that the position and the angle of a shot blasting simulation test piece are adjusted and fixed. According to the method, the cycle efficiency of design and manufacturing is greatly improved, the economic benefit is improved, and the cost of a product research and development stage is saved.

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 present invention relates to the technical field of metal surface treatment, and provides a method for preparing a metal surface oxide film, comprising: performing water jet shot peening on the metal to form a deformation layer on the metal surface; performing surface ultrasonic rolling on the metal that has completed the water jet shot peening to form a gradient lamellar structure based on the deformation layer; detecting and analyzing whether the gradient lamellar structure meets the preset film forming standards, and if so, continuing the film forming process; if not, re-performing the above steps; and reacting the gradient lamellar structure with oxygen to form an oxide film. According to the solution of the present invention, high-strength quenched and tempered steel can quickly produce an oxide layer with good self-lubricity and high stability during the friction process, greatly improving the ability of high-strength quenched and tempered steel to resist friction and wear.