9025 results about "Thin walled" patented technology

Disclosed in the present invention is a large complex ellipsoidal part machining deformation control method based on dynamic cutting planning. The method comprises: performing initial clamping on a blank part, constructing a machining coordinate system, completing reference non-contact measurement and reference surface fitting of inner and outer shape surfaces of the blank part, and completing the division of a generatrix tangent plane; on the basis of product feature decomposition, completing in the same coordinate system the comparison between each theoretical section and an actually measured section, completing cutting evaluation based on the generatrix tangent plane in a machining area, and guiding overall machining route planning and local machining route planning; on the basis of route planning and a cuttable margin, using an adjustable support device to complete part clamping based on dynamic adjustment, so as to realize stable cutting under a variable cutting thickness, and thereby solving the problem of overall deformation control of a large complex ellipsoidal part; and completing high-rib feature twist amount identification in combination with adjustable support, and completing tool path trajectory offset compensation on the basis of a relationship between a circumferential offset and an allowance, and thereby realizing precise compensation machining of a mesh after a local twist. The present invention solves the key difficulties of high-rib local twist deformation compensation and overall deformation control on the basis of ensuring the precision of the residual wall thickness during numerical control machining of a large complex thin-walled ellipsoidal part, thereby further improving the overall manufacturing reliability of a large complex ellipsoidal part.

The invention belongs to the technical field of laser processing, and particularly relates to a special-shaped curved glass laser cutting track planning method. According to the method, the instantaneous thermal effect and the historical thermal accumulation effect are subjected to coupling calculation, high-precision prediction and compensation of thermal deformation in the laser cutting process are achieved, the accuracy of the cutting track is improved, contour deviation caused by thermal deformation is avoided, and the geometric precision is improved; according to the local geometric complexity of the special-shaped curved glass, regions are divided, and differential virtual scanning layers and scanning modes are matched, so that the dynamic balance of efficiency and precision is guaranteed, the processing quality of regions with high curvature, thin walls and the like is guaranteed, the cutting speed of flat regions is increased, and the processing period is shortened; by monitoring the temperature and feeding back actual thermal historical parameters during cutting, model parameters are reversely optimized by using contour precision data after cutting is completed, so that robustness and stability are enhanced, and the yield and process reliability of laser cutting of the special-shaped curved glass are improved.

The invention provides an intelligent real-time detection method and system for PCCP welding quality, and relates to the technical field of online detection and intelligent evaluation of pipeline welding quality through machine learning. Light energy data and multi-light-source images of a spiral weld pool are collected, exposure parameters are dynamically adjusted through the energy difference of visible light near-infrared bands, and the real-time detection of the PCCP welding quality is achieved. Inhibiting strong light interference and generating a weld surface image; a stress concentration area is positioned by scanning a welding seam thermal deformation area and combining speckle pattern change, sound frequency change and the elastic characteristic of the thin-wall steel cylinder; inputting the surface image and the deformation data into a space-time convolutional neural network, fusing light energy change, image details and spatial features to construct a weld joint space structure diagram, and adaptively correcting the position of a sensor; and comparing the sinking depth of the three-dimensional point cloud reconstruction, analyzing the correlation between the sinking degree and the stress, and generating a probability thermodynamic diagram to output the pressure-bearing failure risk level, so that the probabilistic early warning of the pressure-bearing failure risk can be realized.

The invention relates to the technical field of metal forge piece machining, in particular to an irregular metal forge piece heat treatment method and system.The irregular metal forge piece heat treatment method comprises the steps that firstly, temperature compensation partitions are divided according to geometrical characteristics, and stepped preheating is implemented to establish a uniform basic temperature field; then, the heat preservation time of each subarea is independently regulated and controlled in the austenitizing stage, and sufficient transformation of a thick-wall area structure and control over the grain size of a thin-wall area are both considered; in the quenching process, partition strength adjustment is carried out based on a preset cooling map, and cooling parameters are dynamically optimized through real-time feedback; and finally, according to the residual stress distribution, carrying out partition stepped tempering. The heating and cooling uniformity is remarkably improved through partition dynamic temperature management, and the structure difference and thermal stress concentration caused by section sudden change are effectively inhibited; the microstructure is ensured to be uniform and stable through austenitizing control; the hardenability and the deformation resistance are balanced through a differential cooling strategy; and directional reduction of residual stress is achieved through an intelligent tempering mechanism, and the cracking risk is greatly reduced while the comprehensive mechanical property is improved.

The invention discloses a thin-wall structure lightweight design method based on additive manufacturing, and belongs to the technical field of additive manufacturing, and the thin-wall structure lightweight design method comprises the following steps: S100, designing an initial structure based on function and performance mapping; s200, an additive manufacturing process knowledge base is constructed, and the adaptability of the additive manufacturing process is evaluated; s300, carrying out process and structure bidirectional coupling finite element analysis; s400, collaborative optimization of a process and a structure driven by a multi-objective optimization algorithm; s500, feature part manufacturing verification and design and process scheme iterative optimization are carried out; and S600, generating a design and process integrated scheme, wherein the integrated scheme comprises design parameters and manufacturing parameters. The technical problem that in the prior art, the structure optimization target and the manufacturing adaptive capacity are lack of collaboration can be solved.

The invention discloses a high-performance copper alloy pipe and a preparation method thereof. The Sn, Ni and P elements are compositely added into Cu, the content and proportion of all the elements are regulated and controlled, meanwhile, a recrystallization treatment process is combined, a high-proportion sigma 3, sigma 9 and sigma 27 coincidence lattice grain boundary is introduced, and the copper alloy pipe with high strength, high machining forming capacity and excellent pressure resistance, corrosion resistance and high-temperature softening resistance is prepared. Meanwhile, Zr, Co and B (optionally) elements are added on the basis of the alloy components, so that the performance of the copper alloy pipe is further improved. The tensile strength, the processing formability, the pressure resistance, the corrosion resistance and the high-temperature softening resistance of the copper alloy pipe are far better than those of a TP2 copper pipe of the same specification and an existing high-strength copper pipe, the performance requirements of the high-pressure-resistance thin-wall seamless copper pipe are met, and the copper alloy pipe has wide application prospects in the heat exchange field.

The invention relates to the technical field of die-casting dies, and discloses an aluminum die-casting die for a multi-surface thin-wall deep-cavity workpiece, which comprises a workbench, a transposition roller, a support arm and a positioning shaft. The driving motor drives the position changing roller to rotate reversely, the spiral extrusion groove in the position changing roller drives the whole synchronous support to move outwards, the extrusion plate provided with the first mold is pulled to be separated from the second mold, and the purpose of mold separation is achieved; at the moment, an ejector rod and an ejector block on the side wall of the first mold and the side wall of the extrusion plate are in mutual extrusion contact, then the ejector rod can move in the opposite direction, an internal workpiece is ejected out, the demolding purpose is achieved, after demolding is completed, a notch in a transposition roller automatically drives a spray head to move, and a demolding agent is evenly sprayed to a mold core; and the mold is more convenient to use, more reliable to operate and suitable for being widely popularized and used.

The invention provides a thermal-mechanical coupling topological optimization method for a thin-wall non-uniform filling structure, and the method comprises the steps: 1, building a finite element model according to design requirements, and determining a non-design domain and a design domain; 2, initializing a design variable, and then obtaining a local volume fraction polymerization field through one-step filtering; 3, describing the distribution of a material in a design domain; 4, thermal coupling finite element calculation is carried out, and a structural displacement field U is solved; step 5, performing corresponding sensitivity analysis; 6, submitting the sensitivity to a moving asymptote algorithm solver to update an overall topology field and a dot matrix density field; and step 7, checking whether an iteration stop condition is met or not. According to the invention, the lightweight design of the power battery module bracket structure facing the thermal elasticity problem is realized; according to the power battery module support with the thin-wall non-uniform filling structure characteristic, the structural rigidity is improved, and meanwhile, the good heat dissipation performance is shown.

The invention relates to the technical field of model construction, in particular to a three-dimensional model generation method and system based on a lightweight glass container. The method comprises the following steps: performing information acquisition on a lightweight glass container by using a preset multi-mode scanning sensor, acquiring a multi-view visible light image, depth information and structured light projection data, and constructing a standard multi-view point cloud data set; performing multi-modal fusion based on the standard multi-view point cloud data set to obtain multi-modal fusion data of the glass container; performing thin-wall judgment on the multi-mode fusion data of the glass container, and repairing a thin-wall structure to obtain a high-integrity three-dimensional point cloud model; therefore, through multi-modal data fusion, geometric and optical joint optimization and a multi-scale path evaluation mechanism, the problems of low structure reconstruction precision, large transparent material error and process evaluation deficiency in traditional glass container modeling are solved, and the geometric fidelity, the material reduction degree and the construction whole process controllability of the three-dimensional model are improved.

The invention provides a hydraulic automatic pressing and expanding clamp for machining a thin-wall casing, which comprises five parts: the first part is a basic part which consists of a lower base and an upper base, forms a framework of the clamp, is internally provided with a built-in hydraulic oil path and becomes a connection foundation of other parts; the second part is a positioning assembly, the third part is a pressing assembly, the fourth part is a pre-alignment mechanism, the fifth part is a zero-point positioning interface positioning system, the zero-point positioning interface positioning system is composed of nine zero-point positioning joints, and the zero-point positioning interface positioning system is matched with a foundation seat with a zero-point positioner on a machine tool to achieve quick replacement of the clamp. The clamp has the advantages that the clamping alignment time of parts is shortened, high flexibility of the clamp is achieved, machining can be paused at any time for detection or part replacement machining in the midway, the production efficiency is improved, and the clamp has reference significance for numerical control machining of similar thin-wall annular parts.

The invention provides a titanium alloy thin-wall part high-precision milling method and system based on dynamic compensation, and the method comprises the following steps: constructing a multi-physics field coupling model based on the constitutive relation and milling process parameters of a titanium alloy material; according to the method, a multi-physical field coupling model represented by dynamic parameters is constructed, structural feature recognition and coupling weight dynamic allocation are combined, and the model is iteratively optimized through a detection result after processing, so that the problem that a traditional prediction model is disjointed from an actual working condition is solved; by building a real-time monitoring and feedback system and combining a dynamic compensation closed-loop mechanism, non-interruption linkage of monitoring-adjustment in the machining process is achieved, and the problem that the hysteresis of a traditional compensation method is remarkable is solved; the initial compensation amount is optimized through a multi-objective genetic algorithm, a self-adaptive processing path strategy is adopted, dynamic parameter adjustment of structure adaptation is combined, a traditional single compensation strategy is replaced, and the problem of dynamic rigidity change in the complex curved surface and material removal process can be flexibly solved.

The invention relates to the technical field of machining, in particular to a flexible clamp for turning a variable-diameter thin-wall cylinder component and a turning method. The flexible clamp comprises a supporting mechanism and a flexible supporting clamp mechanism which are detachably connected, the supporting mechanism comprises a supporting rod, the supporting rod is detachably connected with the flexible supporting clamp mechanism, and the flexible supporting clamp mechanism comprises a plurality of first supporting assemblies arranged in the circumferential direction. The flexible supporting clamp mechanism can be inserted into the variable-diameter cylinder section of the variable-diameter thin-wall cylinder component in the axial direction of the variable-diameter thin-wall cylinder component, and the first supporting assembly is adjusted to extend in the radial direction so that the first supporting assembly can abut against the inner wall of the variable-diameter cylinder section. The flexible supporting clamp mechanism can effectively avoid workpiece deformation caused by lateral component force, and the flexibility of the flexible clamp is improved. In the machining process, the elastic deformation and vibration of the barrel are controlled within a very small range, and the machining precision is remarkably improved.

The invention relates to the technical field of laser cladding repair of thin-walled parts, in particular to an aerospace thin-walled part laser cladding remanufacturing process chain optimization method. The method comprises the following steps that S1, a CAD model is established according to the damage shape of the thin-wall part, and the CAD model is sliced and layered; s2, establishing a heat-force-stress coupling simulation model, and optimizing a temperature field, a stress field and a deformation field in the laser cladding process; s3, writing a laser cladding path code, and carrying out laser cladding; s4, numerical control milling is conducted on the cladding layer area, and cladding layer errors are calculated; and S5, a low-plasticity ultrasonic rolling technology is adopted for conducting strengthening and finish machining on the repaired surface, stress concentration generated by laser cladding and milling is eliminated through sound wave rolling, and metal surface layer nanocrystallization is achieved. According to the aerospace thin-wall part laser cladding remanufacturing process chain optimization method, through finite element simulation, numerical control and sound wave rolling technologies, the repairing precision and performance of the thin-wall part are improved, and the reliability under extreme conditions is ensured.

The invention discloses a friction stir welding device for a large-curvature thin-wall round pipe type structure, which comprises a weldment clamping tool, a clamping tool supporting mechanism, a stirring welding main shaft, a stationary shaft shoulder stirring welding stirring head and a filling stirring welding stirring head, and further discloses a using method of the device. According to the method, after the joint surfaces of the two round pipes are welded through friction stir circular seam welding of the stationary shaft shoulder, the end part of the filling rod is reserved in the keyhole for filling by using a filling friction stir welding method to finish welding, the method is a solid-phase welding method, and compared with melting welding methods such as electric arc welding and laser welding, the performance of the welded joint is better.

The invention provides a low-speed and ultrahigh-pressure die-casting process method for automobile part die-casting, and relates to the field of automobile part manufacturing. The method includes the following steps that firstly, a mold is prepared, secondly, molten metal is prepared, thirdly, a casting is cooled and demolded, and fifthly, follow-up treatment is conducted. The defects that in the high-speed mold filling process of a common high-pressure casting technology, gas is likely to be involved in the molten metal, and consequently air holes, shrinkage porosity and the like are generated in the casting are overcome; and when key parts such as automobile engine cylinder bodies and hubs are produced, air hole defects possibly cause the problems of air leakage of engines, insufficient hub strength and the like. And meanwhile, for parts with thin walls and complex structures, uniform filling of molten metal in a mold is difficult to ensure by a traditional die-casting process, the defects of cold shut, insufficient pouring and the like are easy to occur, and the qualified rate and the production efficiency of products are reduced.

A placing seat is fixed to the upper portion of a base through a plurality of supporting columns in a suspended mode, a plurality of linear sliding grooves distributed in an annular array mode are formed in the placing seat, and an inner supporting piece and an outer pressing piece are installed in each linear sliding groove; a clamping push plate is connected between the multiple supporting columns in an up-down sliding and sleeving mode, a plurality of pushing pieces are installed on the clamping push plate, the pushing pieces are in sliding connection with the inner supporting piece and the outer pressing piece, and a plurality of position adjusting mechanisms distributed in an annular array are installed below the containing base in a sliding mode; a plurality of inner supporting pieces and outer pressing pieces which are distributed in an annular array mode are arranged above the containing base, two positioning rollers on the inner supporting pieces and the outer pressing pieces can synchronously move in the opposite directions from the inner side and the outer side, the inner wall and the outer wall of a workpiece are clamped at the same time, clamping force appears in pairs, radial force is offset, the workpiece mainly bears uniform centripetal force, and the deformation risk is greatly reduced.

The invention discloses a three-jaw self-adaptive clamping device for a special-shaped workpiece, and belongs to the technical field of machining auxiliary equipment. The three-jaw self-adaptive clamping device comprises a base, three clamping jaws and a driving structure, wherein the three clamping jaws are annularly distributed in the radial direction of the base, and the driving structure is arranged on the base and used for driving the three clamping jaws to move in the radial direction so as to clamp or loosen a workpiece. The three-jaw self-adaptive clamping device further comprises gas-driven self-adaptive structures which are arranged on the sides, close to the workpiece, of the three clamping jaws correspondingly and used for being matched with the surface of the special-shaped workpiece so as to achieve clamping. According to the three-jaw self-adaptive clamping device for the special-shaped workpiece, through an air-driven self-adaptive structure composed of the fixing block, the air cylinder, the telescopic rod, the piston assembly and the reset piece, the surface of the special-shaped workpiece can be efficiently adapted, the problem that a traditional clamping device is poor in adaptability to the special-shaped workpiece is solved, air pressure self-adjustment can be achieved, and the situation that local clamping force is too large is avoided; and deformation of the thin-wall workpiece due to uneven stress is prevented.

The invention discloses a lightweight design method for a thin-wall structure containing a flow channel based on additive manufacturing, and belongs to the technical field of additive manufacturing, and the lightweight design method comprises the following steps: S100, analyzing functional requirements, and constructing a functional requirement model containing the flow channel; s200, a printing direction and additive manufacturing constraint conditions are set, topological optimization is executed on the function demand model, and a preliminary topological structure is obtained; s300, carrying out geometric reconstruction on a topological optimization result to obtain a three-dimensional model suitable for additive manufacturing; s400, carrying out parameter optimization design; s500, the section shape and size of the runner are optimized based on fluid performance requirements; and S600, additive manufacturing manufacturability inspection is conducted on the structure with the section shape and size optimized. And S700, the model obtained after additive manufacturing manufacturability optimization is analyzed and checked. The technical problems that in the prior art, the design requirement of a thin-wall structure containing a runner cannot be met, and the forming quality and the section shape of the inner surface of the runner are difficult to accurately control can be solved.

The invention provides a machining method and tool for a high-precision thin-wall casing of an aero-engine, and belongs to the field of precision machining of thin-wall components of aero-engines. Comprising a clamp body which is provided with a hoisting hole and supporting plate mounting positions distributed in the circumferential direction. The inner-layer clamping mechanism and the outer-layer clamping mechanism are composed of supporting plates distributed along the circumference of the clamp body, each supporting plate is longitudinally provided with a plurality of sets of ejector rods, the ejector rods are locked through ejector rod installation nuts, and the tail ends of the ejector rods are provided with copper alloy ejector rod heads; the outer layer clamping mechanism comprises a pressing plate used for axially pressing the end face of the casing. The support plate is provided with three groups of upper, middle and lower ejector rod screw-thread fit holes. The tool not only has the part positioning function and the clamping space meeting the requirement that rough machining and finish machining of the cartridge receiver can share the same tool, but also has the functions of internal and external multi-point independent supporting and internal and external multi-point simultaneous supporting. According to the technological method, two times of heat treatment is added to remove stress generated by cutting machining, and two numerical control lathe finish machining procedures are refined into seven procedures.

The invention discloses a novel energy absorption box based on zero-Poisson-ratio pressure-torsion metamaterial filling, and relates to the technical field of mechanical metamaterials. The energy absorption box comprises a cylindrical thin-wall shell, a front end plate fixedly connected with the front portion of the cylindrical thin-wall shell, a rear end plate arranged on the rear portion of the cylindrical thin-wall shell, and a 3D accordion type zero-Poisson-ratio compression-torsion metamaterial energy absorption filling body installed in the cylindrical thin-wall shell. The novel energy absorption box based on zero-Poisson-ratio pressure-torsion metamaterial filling has excellent energy absorption capacity and good energy absorption stability; the design of structural parameters can be correspondingly adjusted according to actual working condition requirements; and the method has rich parameter design diversity.

The invention provides a mechanical engineering thin-walled tube automatic welding device and a using method thereof, and relates to the technical field of thin-walled tube welding machining. The mechanical engineering thin-walled tube automatic welding device comprises a bottom frame, a left hexagonal frame and a right hexagonal frame are fixed to the upper portion of the bottom frame, a left tube body and a right tube body are arranged in the left hexagonal frame and the right hexagonal frame respectively, and butt joint structures used for connecting the left tube body and the right tube body are arranged on the hexagonal frames. Bearing structures used for supporting the welding position are arranged in the left pipe body and the right pipe body. According to the mechanical engineering thin-walled pipe automatic welding device and the using method thereof, the left pipe body and the right pipe body are placed in the left hexagonal frame and the right hexagonal frame correspondingly, the left pipe body and the right pipe body can rotate and be automatically welded through the butt joint structure, and the left pipe body and the right pipe body can be supported through the bearing structure to be tightly attached; therefore, the welding quality of the thin-walled tube is improved.

The invention discloses a casting shape / property regulation and control device and method based on a casting mold temperature control technology, and relates to the technical field of intelligent casting. The invention aims to solve the problems of uncontrollable limitation of a traditional casting solidification control technology in a casting solidification process and low yield of a thin-wall casting process. According to the casting shape regulation and control technology based on the casting mold temperature control technology, the casting mold temperature field is controlled before casting mold filling, and mold filling of a complex thin-wall casting is facilitated; the casting solidification process is controlled through the cooling medium, the mechanical property of the casting is improved, and the casting quality is improved. The invention can obtain the casting shape / property regulation and control device and the regulation and control method based on the casting mold temperature control technology.

The invention relates to the technical field of injection molding, and discloses a plastic part injection mold regulation and control system and method based on a complex curved surface and a thin-wall structure, and the plastic part injection mold regulation and control system based on the complex curved surface and the thin-wall structure comprises a mold modeling module, a temperature modeling module, a control modeling module, a control optimization module and a control execution module; the plastic part injection mold regulation and control method based on the complex curved surface and the thin-wall structure comprises the steps that a mold three-dimensional model and thermal control area mapping are built, a heat conduction model is built, modal dimensionality reduction is conducted, a target temperature field and a performance function are combined, optimal temperature regulation and control are achieved through a predictive control algorithm, real-time feedback is matched, and a heating and cooling unit is driven. And dynamic closed-loop control of the mold thermal field is realized. According to the method, thermal control precision and energy consumption efficiency are optimized through Galerkin modal dimension reduction, model predictive control and a weighted performance function, global closed-loop temperature control is achieved by combining mapping of a three-dimensional area and a heating and cooling unit of the mold, and system safety and stability are enhanced.

The invention provides a residual stress prediction method considering ultrasonic peening process parameters of a welded joint, and the method specifically comprises the following steps: carrying out thermal-mechanical coupling simulation of a welded structure based on a finite element method, obtaining a residual stress field of the welded structure, taking the residual stress field as initial stress, and building an ultrasonic peening processing finite element model; on the basis of a hypercube Latin sampling method, a parameter combination sample is extracted, corresponding residual stress data after ultrasonic peening are obtained through simulation, and a residual stress prediction function model containing an undetermined coefficient is established with ultrasonic peening parameters as independent variables. And based on a particle swarm optimization algorithm, training to obtain an undetermined coefficient value which enables a prediction effect to be optimal, and completing establishment of a prediction function model. Therefore, the optimal process parameter combination of ultrasonic peening can be obtained so as to improve the mechanical property of a welded joint. According to the residual stress prediction method considering the ultrasonic impact process parameters of the welding joint, a basis is provided for improving the service performance of a large-scale thin-wall part welding structure.

The invention discloses a thin-wall workpiece milling chatter suppression method based on a piezoelectric actuator. The system comprises an acceleration sensor, a piezoelectric actuator and a signal processing module. The acceleration sensor and the piezoelectric actuator are both installed on the workpiece. In the milling process, the acceleration sensor detects a displacement signal generated by vibration of a workpiece and sends the displacement signal to the signal processing module; a PID controller is arranged in the signal processing module; and the signal processing module adjusts a control signal of the piezoelectric actuator, so that the piezoelectric actuator generates active vibration for inhibiting milling chatter of the workpiece. The acceleration sensor and the piezoelectric actuator are arranged on the workpiece, in the milling process of the thin-wall workpiece, the displacement signal of the thin-wall workpiece is detected, and the input signal of the piezoelectric actuator is dynamically adjusted, so that milling chatter of the thin-wall workpiece is counteracted and restrained through vibration of the piezoelectric actuator, and the milling precision of the thin-wall workpiece is improved. The surface roughness and machining errors of the thin-wall workpiece are reduced, and the machining quality is remarkably improved.

The invention relates to the technical field of welding, and discloses an intelligent control method and system for the welding process of a thin-wall metal component, and the intelligent control method for the welding process of the thin-wall metal component comprises the steps that an initial welding parameter set is determined, and time synchronization is conducted; obtaining multi-source original data with timestamps in the welding process; time alignment is carried out; respectively calculating a current stability index, a heat accumulation index and a molten pool width measured value to obtain a key deviation index; based on the key deviation index, current adjustment amount, pulse parameter adjustment amount and position compensation amount are obtained through calculation; obtaining an adjustment amount set; the current welding parameters are subjected to amplitude limiting updating, and an updated current welding parameter set is obtained through a step-by-step transition method and a high-priority fast instruction; recording a welding process data log, and judging a welding state; carrying out comprehensive evaluation and data storage on the welding process; according to the method, various dynamic changes in the welding process are comprehensively coped with, and the stability and consistency of the welding quality are improved.

The invention relates to the technical field of structural dynamic stress measurement, and discloses a method and system for designing a dynamic stress measurement patch of a lobe-containing whole-ring thin-wall stator structure. According to structural geometric characteristics, modal characteristics, excitation sources, crack positions and the like of the lobe-containing whole-ring thin-wall stator structure, the dynamic stress of the lobe-containing whole-ring thin-wall stator structure is measured; the equivalent vibration stress of all surface nodes of the lobe-containing whole-ring thin-wall stator structure is fully considered, the node with the maximum equivalent vibration stress is determined as the patch point of the strain gauge, the pasting position of the strain gauge can be rapidly determined, the influence rule of the wake region and the non-wake region of the support plate on the dynamic stress of the stator structure can be obtained, the test efficiency is improved, and the test cost is reduced. And the dynamic stress characteristics of the lobe-containing whole-ring thin-wall stator structure can be obtained by utilizing the designed strain gauge, and data support is provided for the high-cycle fatigue resistance design of the lobe-containing whole-ring thin-wall stator structure.

An expandable introducer includes a hub having a distal end and a proximal end, and a sheath coupled to the hub and extending distally therefrom, the sheath defining a central lumen. The sheath is configured to radially expand from a radially unexpanded, folded state having a first diameter and to a radially expanded, unfolded state having a second diameter larger than the first diameter in response to a device passing through the central lumen. A wall of the sheath includes a thick wall region having a first wall thickness and a thin wall region having a second wall thickness smaller than the first wall thickness, wherein the thick wall region includes a coil embedded within the wall of the sheath.

The invention relates to the technical field of welding clamps, in particular to a cabin equipment outfitting welding clamp and a clamping method thereof.The cabin equipment outfitting welding clamp comprises a guide rail, two sliding blocks capable of synchronously and oppositely moving are slidably clamped to the guide rail, a second limiting rod is arranged on the guide rail, a sliding plate is slidably clamped to the sliding blocks, and the second limiting rod is movably sleeved with the sliding plate; an elastic receding assembly is arranged between the sliding block and the sliding plate, the sliding plate can slide on the sliding block when pushed by external force through the elastic receding assembly, a sleeve arranged on the second limiting rod in a sleeving mode is embedded into the inner side of the sliding plate in a clamped mode, and the sleeve and the second limiting rod are matched through a first linkage mechanism. The sleeve rotates when sliding on the second limiting rod; according to the thin-wall fitting-out pipe fitting clamping device, radial and axial synchronous constraint of the thin-wall fitting-out pipe fitting can be achieved, the thin-wall fitting-out pipe fitting is not prone to loosening or deformation in the welding process, meanwhile, coaxial welding is kept, and the welding seam quality is improved.

The invention belongs to the technical field of welding equipment, and particularly relates to a thin-wall container vertical girth welding device which comprises a base, a supporting plate is fixedly connected to one side of the upper end face of the base, a welding gun is arranged on one side of the upper end of the supporting plate, and a clamping turnover mechanism used for adjusting the angle of a container is further arranged on the base. The clamping and overturning mechanism comprises a displacement plate slidably connected to one side of the upper end face of the base, sliding seats are slidably connected to the two sides of the upper end face of the displacement plate, first sliding rods are slidably connected to the two sides of the upper ends of the sliding seats, and lifting plates are fixedly connected to the upper ends of the first sliding rods. Under the cooperation of the clamping turnover mechanism and the taper adaptive material control mechanism, a plurality of disorderly stacked containers to be welded are separated in order, the opening directions of the containers are distinguished, the openings of the two containers are precisely attached, then welding work is conducted, and the situation that workers need to manually and precisely place the containers at the welding positions is avoided.