389 results about "Remanufacturing" patented technology

The present application relates to the field of remanufacturing, particularly to a laser cladding repair method and apparatus for surface damage of part, and a part. The laser cladding repair method for surface damage of part includes: preparing a cladding material for repair, and preparing a groove based on a defect characteristic of a to-be-repaired part obtained from inspection and assessment; performing procedure optimization and procedure qualification; performing, based on a result of the procedure optimization and the procedure qualification, laser cladding repair procedure on a defect location to form a cladding layer on the groove; and performing quality evaluation on the cladding layer. This method may be used for surface repair of damaged surfaces of parts during service, achieving dimensional recovery, performance maintenance, and repeatedly installing and using parts, to solve the practical problems of traditional “replacement instead of repair”.

The invention belongs to the technical field of computer-aided manufacturing, and relates to a method and system for predicting the propagation rate of fatigue cracks across welding zones in electric arc additive remanufacturing, and the method comprises the following steps: S1, manufacturing a sample; s2, performing in-situ SEM fatigue test on the sample; s3, obtaining a corresponding relation between the crack growth rate and the stress intensity factor range of the sample; s4, fitting to obtain a fatigue crack propagation rate model of the sample; s5, establishing a CZH sample fatigue crack growth rate prediction model; and S6, predicting the fatigue crack propagation rate of the sample across the welding zone. The system further comprises an electric hydraulic fatigue test system, a data acquisition module, a database, a fitting module and a prediction module. According to the method, by using the correction coefficient, the fatigue crack growth rate is predicted by using the fatigue crack growth rate parameter of the matrix material area.

The invention belongs to the technical field of permanent magnetization remanufacturing, and particularly relates to a permanent magnetization regeneration method for a waste motor of copper alloy wire processing equipment, and the method comprises the steps: disassembling a waste asynchronous motor, and reserving a case, a stator, a rotor core and a rotating shaft which are not damaged; the specifications of the air injection channels are determined according to the diameter of the rotating shaft, more than two air injection channels are arranged on the rotating shaft at equal-angle intervals, and then the rotating shaft is installed in the machine shell; the rotor core is split to obtain steel sheets, and permanent magnet grooves, magnetic isolation air grooves and air injection channel grooves are formed in the steel sheets; the permanent magnets are assembled in the permanent magnet grooves, then the steel sheets are laminated according to a first rule to obtain a rotor, and then the rotor is assembled to the rotating shaft; a rear end cover of the machine shell is removed, a heat dissipation machine cover is manufactured according to the diameter of the rear end cover, a bearing groove and an air outlet hole are formed in the heat dissipation machine cover, and then the heat dissipation machine cover is assembled to the machine shell; and a frequency converter is additionally arranged on the shell. The remanufactured permanent magnet synchronous motor manufactured by the method has better sealing performance and heat dissipation performance.

The invention provides a full-laser multi-energy-field remanufacturing device and method, and relates to the technical field of laser cladding remanufacturing, and the full-laser multi-energy-field remanufacturing device comprises a laser system, an energy field auxiliary system, a powder conveying system, a monitoring system and an intelligent management and control system; the energy field auxiliary system comprises a magnetic field generation unit and an ultrasonic vibration unit; the monitoring system is used for collecting multi-source sensing data reflecting the state of the molten pool in real time; the intelligent management and control system comprises a machine learning digital twinning module used for acquiring historical process data and receiving and performing analysis and prediction based on multi-source sensing data and the historical process data so as to generate a dynamic cooperative control instruction; and the numerical control execution module is used for receiving the control instruction and performing real-time feedback adjustment on the technological parameters of the laser system and the technological parameters of the magnetic field generation unit, the ultrasonic vibration unit and the powder conveying system according to the control instruction. And real-time and dynamic collaborative feedback regulation and control on a plurality of process units such as laser, a magnetic field, an ultrasonic field and powder feeding are realized.

The invention provides a preparation method of a high-temperature wear-resistant high-entropy alloy layer with a heterostructure, and belongs to the technical field of metal materials and surface engineering thereof. According to the method, a CoCrFeNiTi high-entropy alloy cladding layer is deposited on the surface of a base body through the laser cladding technology, and the thickness of the cladding layer is controlled to be 0.5-2 mm. The component of the cladding layer is CoCrFeNiTi, the atomic ratio content of Ti is controlled not to exceed 8%, so that the structure of the cladding layer is an FCC phase, and cracking of the cladding layer induced by precipitation of a BCC phase is avoided. A high-entropy alloy cladding layer is heated to 550-950 DEG C and subjected to heat preservation for 2-4 h for annealing treatment, alloy elements in the cladding layer are promoted to be separated out, and small heterogeneous strengthening phases such as a Ni3Ti phase and a laves phase are generated in situ. According to the method, a heterogeneous strengthening structure is formed under the condition of not adding exogenous elements, the strength and hardness and high-temperature wear resistance of the cladding layer are greatly enhanced, the method has the advantages of being simple in process, low in cost, high in applicability and the like, and an effective technical scheme is provided for repairing and remanufacturing of the high-entropy alloy.

The present disclosure provides for an automated wire harness diagnosis system and process for measuring the electrical characteristics of a wire harness in order to provide an estimate of the useful lifespan of the wire harness. Embodiments described herein may be deployed in a remanufacturing environment or in a manufacturing environment to provide statistically based estimates of the remaining useable lifetime of the wire harness, thus allowing to reduce costs and waste when producing wire harnesses within a circular economy environment.

The invention discloses an in-situ remanufacturing repair system and method based on three-dimensional point cloud.The in-situ remanufacturing repair system comprises an industrial personal computer, a binocular structure light camera and a collaborative robot, the binocular structure light camera and the collaborative robot are connected with the industrial personal computer, and the collaborative robot is provided with a welding gun connected with an intelligent welding machine; the method comprises the following steps of: performing hand-eye calibration on a binocular structured light camera by adopting dual quaternion and a singular value decomposition algorithm; a binocular structured light camera is used for shooting the workpiece, and a complete point cloud of the to-be-repaired area is obtained; performing surface reconstruction on the to-be-repaired area by using a Poisson surface reconstruction algorithm; according to the side wall fusion optimization formula, path planning is conducted on the to-be-repaired area model in Cura software, and filling path coordinates of the to-be-repaired area are obtained. According to the method provided by the invention, the defect of incomplete fusion of the side wall of the workpiece after additive remanufacturing repair can be reduced, and meanwhile, the surface flatness of the weld joint adjacent to the side wall is improved.

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 discloses a digital twin-driven data-enhanced aviation undercarriage laser shock peening monitoring method, and belongs to the field of aviation structural member remanufacturing, intelligent manufacturing and data driving regulation, and the method comprises the steps: building a fatigue evaluation system for an alternating load in an undercarriage service process, recognizing a high stress concentration region, and carrying out the recognition of a high stress concentration region; a multi-modal monitoring system is constructed, impact data is expanded by adopting a data enhancement method, an impact strengthening physical model is constructed in combination with finite element analysis, impact wave propagation and residual stress evolution are simulated, and collaborative optimization of data driving and mechanism modeling is realized in combination with an experimental data correction model. Impact quality is evaluated based on deep learning, multi-modal data is fused to analyze impact uniformity, and an enhanced abnormal region is identified. And the impact process parameters are optimized through reinforcement learning, and intelligent feedback regulation and control are achieved. According to the method, multi-modal monitoring, data enhancement, physical modeling and intelligent optimization are combined, the stability of laser shock peening is improved, and the fatigue life of laser shock peening is prolonged.

The invention discloses a laser additive repair and remanufacturing defocusing amount real-time monitoring and feedback control method based on infrared sensing assistance, and relates to the technical field of additive manufacturing. One end of the self-adaptive clamp is fixed on the laser cladding head, and the infrared camera is fixed on the laser cladding head by the other end of the self-adaptive clamp, so that rigid connection is realized; the infrared camera is mounted on the side of the cladding head, and a certain included angle is formed between an observation angle and a laser vertical direction; the infrared camera captures a molten pool image; the image processing module performs temperature distribution and shape feature extraction on the molten pool image; the center of the molten pool is recognized through an offset calculation module, and offset calculation and mapping are carried out; the offset is transmitted to a controller through a high-frequency data stream, when the offset exceeds a set threshold value, an early warning signal is triggered, and abnormal data are recorded; and based on a fuzzy control strategy, comprehensively analyzing the direction and amplitude of the offset, generating an adjustment instruction, sending the instruction to a servo motor, and restoring the defocusing amount to a target value by adjusting the Z-axis height of the laser cladding head. According to the technical method, the infrared camera is fixed to the laser cladding head through the self-adaptive clamp, and the molten pool image center offset is monitored in real time based on paraxial setting, so that accurate defocusing amount prediction is achieved.

The invention discloses a man-machine collaborative additive repairing and remanufacturing method based on multi-modal perception, and belongs to the technical field of intelligent manufacturing and additive manufacturing, and the man-machine collaborative additive repairing and remanufacturing method comprises the following steps: S1, based on an additive repairing environment of a damaged part, establishing a three-dimensional grid map; s2, constructing a three-dimensional damage model based on the damage morphology data acquired by the multi-modal data acquisition module; s3, based on the three-dimensional damage model, a planned repair path and matched technological parameters thereof are obtained; and S4, based on the planned repair path, the repair equipment performs additive repair on the damaged part. According to the method, the additive repair environment three-dimensional grid map system is constructed, the repair environment and the damaged part are subjected to multi-angle scanning, and the visual sensor is synchronously adopted to collect the three-dimensional shape data of the damaged part, so that the sub-millimeter-level cooperative positioning of the repair equipment operation space and the damaged area is realized; and an accurate three-dimensional space reference is provided for subsequent repairing operation.

The invention relates to the technical field of laser, in particular to a follow-up atmosphere protection large slewing bearing laser cladding repairing device and method.The device comprises a large slewing bearing, a laser cladding system, an X-Z-axis two-dimensional motion platform, a follow-up inert atmosphere chamber, a C-axis rotating table, an atmosphere control system and a master control system. According to the invention, the cladding head is driven to generate relative motion in the vertical direction and the horizontal direction by virtue of the X-Z-axis two-dimensional motion platform, and the inert atmosphere chamber and the cladding head are driven to move in the circumferential direction of the slewing bearing subjected to additive machining by virtue of the C-axis rotating table, so that continuous machining of laser cladding additive manufacturing and remanufacturing of the large rotary structural member is realized. The follow-up inert atmosphere chamber is small in volume, short in inflation and deflation time and high in efficiency. And the cladding head is provided with double hammering units, so that hot metal which is just deposited can be hammered synchronously, and cladding processing and processing post-processing can be carried out synchronously.

The utility model discloses an auxiliary device for additive remanufacturing, and relates to the technical field of additive manufacturing. The device comprises a gathering frame, a discharging box is fixedly installed at the bottom end of the gathering frame, two sets of symmetrically-distributed rotating rods are rotationally arranged in the discharging box, pressing rollers are fixedly arranged on the outer sides of the two sets of rotating rods, first gears are fixedly arranged at one ends of the two sets of rotating rods, and the multiple first gears are connected in a meshed mode. A collecting box is slidably arranged at the bottom of the discharging box, a rotating shaft is rotatably arranged on one side of the discharging box, a second gear is fixedly arranged on the outer side of the rotating shaft, and a third gear is connected to the bottom of the second gear in a meshed mode. According to the device, chippings can be extruded to be in a sheet shape through the pressing rollers, the occupied area of the chippings is reduced, meanwhile, the collecting box can move in a reciprocating mode, the chippings can be evenly distributed in the collecting box, the chippings are prevented from being accumulated at one position of the collecting box, and the cleaning frequency of workers is reduced.

The invention belongs to the technical field of laser remanufacturing and high-end equipment repairing, and particularly discloses a steam turbine rotor R angle laser cladding repairing process which is used for conducting segmented multi-layer laser cladding on a steam turbine rotor R angle to ensure that the laser cladding thickness reaches the steam turbine rotor R angle repairing thickness and has machining allowance. The thickness of each layer of laser cladding is 0.7 mm-0. 9 mm, and ultrasonic impact stress relief treatment is carried out after each section of laser cladding is completed. And PT nondestructive flaw detection, phased array ultrasonic detection, hardness detection and residual stress detection are fused to ensure the repair quality. The rotor is suitable for 530 DEG C high-temperature and high-pressure working conditions, the cost is greatly reduced compared with rotor replacement, and the rotor has remarkable industrial application value.

The hydraulic stand column remanufacturing production line comprises a cylinder body repairing production line and a hydraulic part assembling production line which are arranged on the two sides of a main channel correspondingly. The cylinder body repairing production line comprises a process joint welding area, a raw material storage area, a repairing line raw material warehousing area, an outer circular surface repairing area, an inner circular surface repairing area, a honing buffer area, a deep hole honing area and a process joint cutting area which are arranged in sequence; the hydraulic part assembly production line comprises an assembly line raw material warehousing area, an assembly line material storage area, a cylinder body cleaning area, an assembly area A, an assembly area B and an assembly finished product storage area which are sequentially arranged. Workpieces are transferred through the truss manipulator and the AGV. Automatic surface repairing operation and automatic assembling operation of the heavy-weight cylinder workpiece can be automatically achieved, the automation degree is high, the labor cost can be greatly saved, the working efficiency and the production efficiency are improved, and meanwhile the assembling quality can be effectively guaranteed.

The invention relates to the technical field of additive remanufacturing, and particularly discloses a laser composite additive remanufacturing process method which comprises the following steps: melting alloy powder through a laser cladding nozzle and spraying the alloy powder on a to-be-repaired surface to form a cladding layer; furthermore, volume damages in forms of corrosion holes, cracks, fractures and the like on the to-be-repaired part are repaired, and meanwhile, a laser impactor is used for carrying out laser impact strengthening on the cladding layer, so that the fatigue life strength of the cladding layer is improved. According to the device, a large amount of heat does not need to be input, then the influence on the mechanical property of an original to-be-repaired part can be reduced, laser shock strengthening is conducted on the cladding layer through the laser impactor, and the phenomena that the repaired layer is coarse in tissue dissimilation and unbalanced in residual stress distribution of the cladding layer are avoided.

The invention discloses a welding seam detection remanufacturing system and device for a hydraulic support, particularly relates to the technical field of mining equipment remanufacturing, and is used for solving the problems of secondary stress migration and base material cracking caused by local heat input during in-situ repair of a box type structural part. A data acquisition module is used for acquiring contour coordinates of a repair area and thickness distribution of base metal; the unit division module divides a stress buffer unit containing a heat input regulation and control subarea based on the thickness gradient and the rib plate layout; the boundary redivision module dynamically optimizes the subarea boundary through geomagnetic field gradient scanning; the heat shock control module executes layered repair welding and activates subarea heat input in sequence; the energy ratio monitoring module switches the activation sub-regions in real time according to the acoustic emission energy ratio to block microscopic plastic deformation; the stress processing module eliminates a migration stress peak value through external expansion area residual stress scanning and local thermal relaxation; the whole-process regulation and control of the stress evolution in the repairing process are realized, and the repairing safety and the service life of the box type structural member are guaranteed under the immovable working condition.

The invention discloses an automatic valve remanufacturing production line and a technological method, and relates to the technical field of industrial automation. The valve placing station, the automatic disassembling station, the polishing and cleaning station, the stacking welding station, the processing station and the laser cladding station are sequentially arranged on the same side of the ground rail in the walking direction of the ground rail, a plurality of part storage stations are sequentially arranged on the other side of the ground rail in the walking direction of the ground rail, and a robot is installed on the ground rail. Grabbing and conveying are achieved through the robot, the maintenance process is more standardized and easy to manage through orderly arrangement of stations, reduction of space waste, improvement of the space utilization rate and sequential arrangement of all the stations, manual operation is reduced through introduction of the robot, and the consistency and accuracy of operation are improved; the invention further provides an automatic maintenance and remanufacturing process method for the valve, each step is accurately controlled through the robot, the maintenance quality is improved, and the maintenance efficiency is improved.

The invention discloses an aluminum-based ceramic composite coating and a preparation method and application thereof, and belongs to the technical field of material surface engineering and remanufacturing. The preparation method comprises the following steps that 1, alumina ceramic particles and titanium powder are subjected to acoustic resonance mixing, and metal-coated ceramic composite powder of a shell-core structure is obtained; secondly, the composite powder is wrapped with an aluminum alloy outer skin, and the aluminum-based ceramic powder core wire is obtained through a drawing process; and thirdly, the powder core wire is sprayed through the high-speed electric arc spraying technology, and the aluminum-based ceramic composite coating is obtained through an arc zone dynamic metallurgy self-propagating exothermic reaction. The aluminum oxide / aluminum composite coating effectively solves the failure technical problems that a traditional arc spraying aluminum oxide / aluminum composite coating is prone to corrosion, abrasion, peeling and the like in a severe service environment, and can be used for manufacturing and operation maintenance of key parts of equipment in the fields of aerospace, water conservancy ocean, national defense science and technology and the like serving under extreme working conditions.

The invention belongs to the technical field of remanufacturing process, and discloses a digital twin-driven reprocessing scheduling optimization method, which comprises the following steps: initializing and generating a reprocessing initial scheduling scheme in a physical workshop, and moving the reprocessing initial scheduling scheme to a third window of a virtual workshop; based on a rolling window mechanism, moving the task which is being reprocessed currently and the task which is about to be reprocessed from the third window to the second window; if it is detected that the emergency task is inserted, all reprocessed tasks in the second window are moved to the first window; moving the emergency task to a second window; based on the target function of minimizing the total cost and the total time, a whale optimization algorithm is adopted for solving, and rescheduling schemes of all tasks in the second window are obtained; and sending the rescheduling scheme to the physical workshop for execution until no task needing rescheduling exists in the third window. According to the method, insertion of emergency tasks is considered, and rescheduling and response efficiency are considered.

The utility model relates to a hydraulic support bearing pin shaft dismounting device, and belongs to the technical field of hydraulic support maintenance. Comprising a supporting base, a vertical supporting base plate is fixedly arranged on the front edge of the upper end face of the supporting base, a pin shaft through hole is formed in the center of the supporting base plate, three connecting circular shafts are fixedly arranged on the rear end face of the supporting base plate, and an annular tensioning seat is arranged on the rear side of the supporting base plate and comprises a vertical annular plate; three fixing cylinders are fixedly arranged on the front end face of the annular plate and correspond to the three connecting circular shafts in a one-to-one front-back mode, and a telescopic jack is arranged between the corresponding fixing cylinder and the corresponding connecting circular shaft. Two lug plates which are symmetrical up and down are fixedly arranged at the center of the front end face of the annular plate, a pull rod is inserted between the two lug plates, and the pull rod comprises a threaded shaft on the front side and a linear rod on the rear side; the problems that when an existing hydraulic support is maintained and remanufactured, the bearing pin shaft disassembling efficiency is low, and the labor intensity is large are solved.

The invention provides a remanufacturing workshop scheduling method based on reinforcement learning and evolutionary algorithm fusion, relates to the technical field of production scheduling optimization, and solves the problem of remanufacturing system scheduling in three stages of disassembly, reprocessing and assembly. A four-dimensional decision model covering process sorting, factory distribution, machine selection and speed gear scheduling is constructed, and an initial population with diversity and high-quality characteristics is generated by adopting a multi-strategy hybrid initialization method. A reinforcement learning decision module based on Q-learning is introduced, an optimal combination is dynamically selected from various crossover operators, mutation operators and neighborhood search strategies, the crossover probability and the mutation probability are dynamically corrected according to the distribution characteristics of the Pareto leading edge, and a dual escape mechanism is integrated to enhance the capability of the algorithm to jump out of local optimum. According to the scheme, the group search advantage of the evolutionary algorithm is exerted, the dynamic optimization of the search process is realized, and an efficient and accurate scheduling solution is provided for a complex remanufacturing system.

The invention relates to the technical field of remanufacturing, in particular to a beryllium bronze piston part inner wall damage repairing method which comprises the following specific steps: S1, defect inspection; s2, preparing an electrode bar; s3, electric spark coating repair is carried out; s4, remelting by a cold welding machine; s5, heat treatment; s6, honing an inner hole; s7, repairing and verifying; according to the method, a method of electric spark coating repairing and cold welding composite repairing is adopted, the problem that an electric spark coating repairing layer is not compact is solved, the problem that wire feeding is difficult in the cold welding inner hole repairing process is solved, the problem that an overlong electrode bar rotating at a high speed shakes in the electric spark coating repairing process is solved by adopting the specially-made electrode bar, and the welding quality is improved. The metallographic phase of the repair layer does not have cracks and incomplete fusion defects, the repair layer is metallurgically bonded with the substrate, and the hardness of the repair layer reaches more than 90% of that of the substrate of the plate.

The invention discloses a carbon footprint accounting method for a remanufactured generator based on a remanufacturing life cycle, and relates to the technical field of generator remanufacturing, and the method comprises the steps: obtaining a corresponding remanufacturing life cycle when a generator which does not meet a use demand is remanufactured, and a remanufacturing reason which does not meet the use demand; creating a boundary model corresponding to the remanufacturing process; based on the boundary model and the remanufacturing reason, determining a carbon emission source of each stage in the remanufacturing process; and obtaining an emission factor corresponding to the carbon emission source of each stage, calculating the carbon emission of each stage based on the emission factor, and carrying out summation processing on the carbon emission of each stage to obtain the carbon footprint of the remanufacturing life cycle. The problem that in the prior art, after the generator loses original efficiency, resources are wasted when the generator is scrapped is solved, and remanufacturing of the generator losing the original efficiency is achieved so that energy can be saved.

The invention relates to the technical field of nano repair materials, in particular to a ship remanufacturing nano repair material and a preparation method and application thereof, and the nano repair material comprises the following raw materials in parts by weight: 30-35 parts of nano tungsten carbide, 25-30 parts of nano titanium carbide, 25-30 parts of nano silicon carbide, 10-15 parts of modified boron nitride powder and 6-9 parts of a carbon nanotube doping-based additive. According to the nano repairing material, nano tungsten carbide, nano titanium carbide and nano silicon carbide are blended to serve as a base body, meanwhile, the added modified boron nitride powder and the added carbon nano tube doped increasing agent are mutually blended, matched, optimized and improved, and the obtained nano repairing material product has excellent wear resistance, impact resistance and pollution resistance; the performance of the product can be harmoniously improved, and the heat-resistant, corrosion-resistant and stable effects of the product are remarkable.

The invention relates to the technical field of metal material surface engineering and equipment remanufacturing, in particular to an early acoustic emission diagnosis and laser cladding repair method for thermal fatigue cracks in a mold service process, which comprises the following steps: S1, synchronously acquiring and preprocessing multi-source heterogeneous data; stress wave signals are collected in real time through a broadband acoustic emission sensor array permanently integrated on the surface of a mold cavity, the frequency response range of the sensor is 100 kHz to 1 MHz, and the sensitivity is not lower than 95 dB. According to the method, accurate identification and positioning can be realized at the initial stage of crack initiation through multi-modal sensing fusion and a deep learning algorithm, the diagnosis accuracy is remarkably higher than that of a traditional offline detection method, and precious time is won for subsequent repair.

The invention belongs to the technical field of metallurgical equipment remanufacturing, and particularly relates to a gradient functionalized high-toughness shear blade material based on double-laser melting forging time sequence coupling and a preparation method thereof. The gradient functionalized high-toughness shear blade material is prepared from the following components in percentage by mass: 0.6 percent to 0.7 percent of C, 4.5 percent to 5.5 percent of Cr, 1.8 percent to 2.2 percent of W, 1.2 percent to 1.5 percent of Mo, 0.8 percent to 1.0 percent of V, 2.8 percent to 3.2 percent of Ti, 0.008 percent to 0.015 percent of B, 0.02 percent to 0.05 percent of Ce and the balance of Fe and inevitable impurity elements. Through a three-in-one coordinated regulation and control system of gradient material design, double-laser time sequence coupling and in-situ interface strengthening, the technical bottleneck that the hardness and the toughness of a shear blade material cannot be obtained at the same time is broken through, and the problems of tipping failure, insufficient fatigue life and the like of a traditional disc shear blade material during service are solved.

The invention relates to the technical field of remanufacturing, in particular to an undercarriage lug surface damage laser additive repairing method which comprises the steps that a damaged undercarriage lug part is subjected to magnetic powder or dye penetrant inspection to determine a damaged area and is polished; preparing powder for laser additive repair by adopting a vacuum induction melting inert gas atomization process; the powder prepared in the second step is used, and mobile laser cladding equipment is adopted for conducting cladding repairing on the grinding area; laser shock strengthening is conducted on the part repairing area; whether the repaired area is 0.1 mm higher than the surface of the lug part or not is tested; preparing a cooling solution from ethanol and liquid nitrogen for cold treatment; the repaired connecting lug part is polished and finely trimmed, so that the size of the part meets the use requirement; using magnetic powder or dye penetrant inspection to confirm that the repaired area has no crack; and preparing a test piece to verify the repair effect. According to the method, the problems of conventional micro-arc deposition, long welding repair period and reduced shaping caused by the long welding repair period are solved.

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 application discloses a WC reinforced tin-based babbitt alloy composite coating and an ultrahigh-speed laser cladding preparation method thereof, and belongs to the technical field of laser additive manufacturing and surface engineering. The coating is composed of WC particles and a SnSb11Cu6 matrix, the WC particles are uniformly and dispersedly distributed in the matrix, and the coating is free of cracks and through pores. The preparation method comprises the following steps: mixing WC particles with SnSb11Cu6 powder, drying, and then cladding on a 20 steel matrix by using an ultrahigh-speed laser cladding (EHLA) technology. Compared with a pure babbitt alloy coating, the hardness of the coating is increased by 45%, and the wear rate is reduced by 37%, the hardness and wear resistance are simultaneously improved, and the WC particle agglomeration and excessive melting are avoided, so that the coating is suitable for surface strengthening and remanufacturing of sliding bearing bushings.