2254 results about "Internal stress" patented technology

The invention relates to the technical field of structure health monitoring, in particular to a basement prestress bottom plate health monitoring system based on the internet of things, which comprises a stress distribution analysis module, a defect diffusion analysis module, a damage characteristic evaluation module and a safety monitoring evaluation module. According to the method, accurate stress data collection and real-time monitoring are realized by capturing spatial position information and node stress values, so that stress change is carefully tracked and evaluated, stress conduction and edge weight between monitoring points are analyzed, the internal stress distribution state of the structure is accurately revealed, the defect diffusion range and path are simulated, and the damage trend is predicted in time; according to damage characteristic evaluation, through analysis of stress mutation and material strain, key data support is provided, maintenance decision making and maintenance plan optimization are effectively guided, threshold value classification and early warning implementation of safety monitoring evaluation are effectively guided, the recognition capacity of an overproof stress concentration area is improved, and the reliability of the system is improved. And the overall safety and stability of the structure are ensured.

The invention relates to a triangular rotating rigid body structure with compression and torsion characteristics, and belongs to the field of mechanical metamaterials, the triangular rotating rigid body structure comprises two kinds of tension cell element structures, and each cell element structure comprises a three-rod tension integral structure assembly and a degree-of-freedom constraint assembly. Under the action of a three-rod nine-cable tension integral structure, when the structure is not subjected to external load, the structure is subjected to interaction of internal stress, and the balance is achieved in a self-stabilization state; under the state of external load, the upper surface and the lower surface of the cell element structure can generate a torsion effect, and the structure can recover to the initial state after the external load is removed again. The triangular rotating rigid body structure with the compression torsion characteristic has the advantages of self-adaptability, self-recovery, indentation resistance characteristic and the like. The tensegrity structure and the mechanical metamaterial structure are combined, the types of existing mechanical metamaterial cell element structures are enriched, and a brand new direction is opened up for design, analysis and application of the tensegrity mechanical metamaterial structure.

The invention is suitable for the field of film manufacturing, and provides a PO film tape casting process which comprises the following steps: S1, raw material pretreatment; s2, mixing the materials; s3, melt extrusion; s4, carrying out tape casting; s5, cooling and shaping; s6, thickness detection and adjustment; s7, carrying out post-treatment; and S8, rolling is conducted. According to the invention, the three-stage gradient cooling process significantly reduces the internal stress of the film, improves the dimensional stability, and reduces the warping shrinkage of subsequent processing; the thickness deviation of the thin film is controlled within + / -0.01 mm through an online thickness detection and automatic adjustment system, so that the product precision is improved; the surface tension of the film is stably improved by the corona post-treatment process, and the application scene is widened; through strict raw material pretreatment, the bubble defect of the film is effectively avoided, and the appearance quality of the product is improved; and a combined process of high-speed mixing and double-screw extrusion is adopted, so that uniform dispersion and full plasticization of the materials are ensured, and the problems of crystal points, stripes and the like are reduced.

The invention belongs to the technical field of underground engineering, and discloses an omnibearing intelligent monitoring system, method and device for an underground anchoring pull-out test. According to the method, electromagnetic signals generated in the stress process of the anchor rod are captured in real time through an electromagnetic sensor, and internal stress changes and energy distribution are reflected; the deformation and stress states of the anchor rod in the dynamic environment are evaluated through a strain gauge and accelerometer combined data combination method, the deformation condition of the anchor rod is monitored through the strain gauge, and the stress-strain relation is recorded; an accelerometer is used for detecting the dynamic response of surrounding rock mass so as to evaluate the overall stability of the rock mass; a coupling medium is injected, the computer terminal stores the collected signals locally or in a cloud end and analyzes the signals, stress and deformation parameters in an anchor rod pull-out test are extracted, and an anchor rod stress cloud picture is generated in real time. According to the method, the safety and reliability of underground engineering are remarkably improved, and a new technical support is provided for evaluation of anchoring quality.

The invention belongs to the technical field of powder metallurgy, and relates to a preparation method and application of a high-performance isotropic GH4698 drum piece, prepared GH4698 high-temperature alloy powder with the particle size of 53-250 microns is loaded into a prefabricated sheath under the condition that the vacuum degree is smaller than or equal to 1 * 10 <-3 > Pa, after treatment is conducted 2-3 times through a multi-cycle hot isostatic pressing process system, furnace cooling is conducted, and the high-performance isotropic GH4698 drum piece is obtained. And machining is adopted to remove the sheath to obtain a GH4698 drum piece blank in a powder metallurgy state, and a solid solution and aging heat treatment process is adopted for the drum piece blank, so that the high-performance isotropic GH4698 drum piece can be obtained. According to the preparation method, the yield of the GH4698 drum part can be effectively increased, the GH4698 drum part with high performance and isotropic performance can be obtained by effectively improving the grain size and distribution of the part, the carbide distribution and the internal stress state of the part, the utilization rate of an alloy material is promoted to be increased, the stability of the production process is improved, and in addition, the yield of the GH4698 drum part is improved. All mechanical properties of the prepared GH4698 drum piece meet the performance requirements of a drum shaft for a novel aero-engine.

The invention discloses a gradually-changed Si-Al alloy coating diamond / aluminum-based composite material and a preparation method and application thereof, and the gradually-changed Si-Al alloy coating diamond / aluminum-based composite material is composed of an aluminum matrix and modified diamond evenly dispersed in the aluminum matrix. The modified diamond comprises diamond particles and a gradually-changed Si-Al alloy coating wrapping the surfaces of the diamond particles, in the gradually-changed Si-Al alloy coating, the mass fraction of Si is linearly decreased from 100% to 0% from inside to outside, and the mass fraction of Al is linearly increased from 0% to 100% from 0%. According to the method, the Si-Al alloy coating with gradually-changed and controllable components is constructed on the surface of the diamond, so that a SiC transition layer with strong binding force can be formed with the diamond, the gradient gradient coating is formed from inside to outside, internal stress can be released, good metallurgical bonding with an aluminum matrix can be achieved, formation of an Al4C3 phase is inhibited, and therefore the performance of the composite material is remarkably improved.

This invention discloses a process for controlling the shape of A514GrQ extra-thick plates for offshore platforms. It uses 800-1000mm thick steel ingots, and after removing and cleaning the ingot risers, ensures uniform thickness of the ingot body, laying the foundation for obtaining steel plates with excellent flatness. The heating process is optimized to ensure uniform heating of the ingot head, middle, and tail, facilitating uniform deformation during rolling. Homogenized rolling is employed to reduce cooling water usage, limit the reduction per pass, and control the final rolling temperature, avoiding uneven internal stress and shape rebound in the steel plate. The final product is a 180-210mm thick steel plate with a maximum flatness ≤8mm and a lateral flatness ≤4mm within a length of 10000mm and a width of 2400mm, significantly reducing subsequent leveling tasks.

The invention belongs to the technical field of PBT plastic particle injection molding, and particularly relates to a precise injection molding process control system for PBT plastic particles. The control system is composed of the following modules: a material characteristic sensing and modeling module, a multi-physical field simulation and parameter generation module, a distributed optical fiber global sensing module, a predictive closed-loop control module, and a digital twinning and full-period optimization module. The material characteristic sensing and modeling module is used for acquiring microscopic parameters of PBT raw materials through a near infrared spectrum sensor and constructing a material characteristic dynamic model; raw material characteristic fluctuation is pre-judged through near infrared spectrum dynamic modeling, technological parameter drift is predicted in advance in combination with an LSTM neural network, and feed-forward compensation is started before deviation is formed; compared with post correction in the prior art, the mechanism has the advantages that the parameter fluctuation control precision is improved, and the prevention efficiency for the problems of hydrolytic degradation, internal stress concentration and the like which are prone to occurring in PBT is improved.

The invention relates to the field of mechanical fatigue simulation, and discloses a method for simulating and deducing the number of torsion cycles. Comprising the steps that a component three-dimensional parameterized model is constructed, and material fatigue characteristics are defined; applying a periodic torsion load spectrum containing a harmonic component; adopting a stress influence coefficient matrix method to execute quasi-static finite element analysis, and extracting a multi-axis stress state; calculating the maximum alternating shear stress and the average shear stress based on a critical plane recognition technology; converting into a single-axis equivalent stress amplitude through a gradient enhanced multi-axis correction rule; calculating node fatigue damage by combining an S-N curve and a damage accumulation theory; and when the damage reaches a threshold value, outputting a failure cycle number and a position. The innovation points are as follows: the prediction error is controlled within 10% by a critical plane and multi-axis correction technology; a stress matrix method realizes ten thousand times of cycle-level efficient simulation, and the efficiency is improved by 10 times; the risk early warning accuracy rate is improved to 96% by integrating a process correlation defect model; and the research and development period is shortened by 40% through a life cloud picture and an automatic optimization closed loop. The method is suitable for transmission shaft system reliability design.

The invention discloses an optical fiber silicon-based microstructure underwater acoustic sensor which is a non-intrinsic F-P air microcavity probe with optical signal interference formed by an optical fiber end face and a silicon-based thin film, the characteristic that the silicon-based thin film is sensitive to sound pressure signals is used for picking up sound pressure changes in a liquid sound field environment, the sound pressure changes are converted into the variable quantity of an optical signal interference phase, and the optical fiber silicon-based microstructure underwater acoustic sensor is obtained. Reducing a sound pressure signal in the liquid sound field through a detection demodulation algorithm; the microcavity probe is packaged by using an organic material thin shell structure, so that the hydrostatic pressure resistance of the underwater acoustic sensor is improved to adapt to application in a deep water environment; the optical fiber silicon-based microstructure underwater acoustic sensor comprises an acoustic sensing silicon microstructure, a microstructure sensing probe and a sensor pressure-resistant structure, according to the acoustic characteristic design of the acoustic sensing silicon microstructure, silicon oxide / silicon nitride and other materials are used as sensing materials, and membrane external stress recovery is achieved through internal stress residues. The method is easy to implement in design process, flexible in application and high in environmental adaptability, and can be applied to noise monitoring and target detection in various complex scenes.

The invention relates to the technical field of composite material processing, in particular to a ply rolling high-temperature plastic flow control method and processing equipment for a nickel steel composite plate, and the processing equipment comprises a ply rolling chamber, a hot rolling mill assembly, an adjusting assembly and a pressure maintaining assembly. An adjusting assembly capable of adjusting the contact area of a plate and the hot rolling mill is arranged on the front portion of the hot rolling mill, line contact between the plate and the hot rolling mill is adjusted into face contact, heating efficiency is improved, and composite production efficiency is guaranteed. Therefore, opposite metal is extruded into a fresh surface formed by interface rubbing through plastic flow, staggered interfaces are further formed, the interface bonding strength is improved, meanwhile, internal stress around extrusion points can be counteracted mutually, the nickel plate and the steel plate cannot generate excessive relative movement, and the service life of the nickel plate and the steel plate is prolonged. And the interface bonding quality of the composite board is ensured.

The invention discloses a cultural relic preventive protection method based on big data analysis, belongs to the technical field of cultural relic protection, and mainly aims to solve the technical problem that a complex damage mechanism caused by mutual coupling of torsional deformation and inclined deformation in cultural relic protection is difficult to accurately predict. A dual-mode deformation data stream is obtained through a multi-point sensor, accurate data alignment is achieved through millisecond-level time synchronization processing, and correlation characteristics between deformation modes are recognized by calculating a coupling strength coefficient through correlation analysis. And when the coupling strength exceeds a threshold value, determining a deformation propagation direction vector by combining a spatial interpolation method, and calculating an internal stress distribution field and positioning a stress concentration area by utilizing a finite difference method. High-frequency sampling tracking is carried out on the high-risk area, and a stress relaxation time constant and a creep coefficient are obtained. Accurate prediction and active protection of cultural relic deformation damage are realized.

The invention relates to a forming mold for improving the injection molding quality of a fan-shaped chip, which comprises a mold assembly, the mold assembly is mainly composed of a front mold and a rear mold, and the front mold and the rear mold are connected through a guide mechanism; and the rear mold core is connected to the top of the rear mold, a fan-shaped groove is formed in the top of the rear mold core in a downward penetrating mode, and an injection molding runner is formed in the position, located on the outer side of the arc position of the fan-shaped groove, of the top of the rear mold core. The invention relates to the technical field of molds. According to the forming mold for improving the injection molding quality of the fan-shaped chip, the injection molding runner is formed in the top of the rear mold core, and the at least two sprues are formed in the injection molding runner, so that injection molding pressure can be effectively reduced through simultaneous injection molding of the multiple sprues, and internal stress is prevented from being generated in a plastic part; therefore, the exhaust efficiency during injection molding can be guaranteed, vacuum bubbles generated in the plastic part due to poor exhaust effect can be avoided, and the quality of the chemiluminescence centrifugal disc quintuple-detection chip plastic part can be further improved.

The invention discloses a rapid development method and system for a high-performance nodular cast iron material based on electronic metallurgy, and relates to the technical field of electronic metallurgy, and the rapid development method comprises the steps that a high-performance nodular cast iron raw material is smelted through multi-stage electron beams, and uniform molten metal is obtained; monitoring the chemical components and temperature change of the molten metal in real time, and dynamically adjusting the addition of the spheroidizing agent; the pouring speed and pressure of the molten metal subjected to spheroidizing treatment are intelligently controlled, and casting pouring is conducted; the internal stress change of the casting is monitored in real time through an embedded stress sensor, and the casting cooling process is adjusted; the cooled casting is subjected to surface treatment, heat treatment and machining; component detection and performance testing are conducted on the casting obtained after treatment and machining are completed; through the multi-stage electron beam melting technology, accurate control over the temperature and chemical components of the molten metal is achieved, and the uniformity and stability of the molten metal are ensured.

The application relates to the field of building technology, in particular to a post-tensioned prestressed seamless concrete floor construction method. In the construction preparation step, a strain sensing sensor is arranged, and a steel strand with a protective sleeve is arranged; in the concrete pouring step, concrete with good early strength is adopted; in the prestressed tensioning step, the stress and tension are monitored through a preset sensor, the strain value when the floor first cracks is determined, the initial value for starting the tensioning device is determined, and the tensioning device is controlled to start tensioning operation. Subsequent control is realized through a control system according to the information monitored by the sensor and the instruction control, and the preset threshold value is preferably less than the initial value for starting the tensioning device, so that the tensioning is started before the internal stress of the concrete is insufficient to cause cracks, and the tensioning process is effectively controlled before the cracks are generated, so that the floor is ensured not to generate cracks.

The invention belongs to the technical field of keel bending, and particularly relates to an automatic bending device for a light steel joist, which comprises a conveyor, a bending assembly is arranged above the conveyor, and the device is provided with the bending assembly, so that the light steel joist can be attached to the surface of the bending assembly to be subjected to pre-deformation bending treatment; the light steel joist is subjected to small-angle deformation before formal bending treatment, so that the resilience after edge folding can be reduced, the residual stress in the light steel joist can be released, the possibility of quality problems such as deformation and cracking caused by stress concentration is reduced, the structural strength and durability of the light steel joist are enhanced, and the service life of the light steel joist is prolonged. The stability and reliability of the whole structure are guaranteed, the internal stress distribution is more uniform and reasonable, so that the machining precision and the product quality are improved, the bending consistency of the light steel keel is guaranteed, manual intervention is not needed, the automation degree of the bending process is greatly improved, the labor intensity is relieved, and the production efficiency is improved.

The invention relates to the technical field of bridge engineering, in particular to a bridge steel truss girder gusset plate structure and a construction method thereof. The bridge steel truss gusset plate structure comprises a pi-shaped gusset plate formed by a bottom plate and a vertical plate, a plurality of H-shaped steel bases are installed in the pi-shaped gusset plate, each H-shaped steel base is provided with an H-shaped web member through a high-strength bolt, and a monitoring assembly used for early warning of internal stress of the pi-shaped gusset plate is arranged in each H-shaped steel base. The monitoring assembly comprises a tension sensor used for monitoring stress between the H-shaped steel base and the H-shaped web member and a gear used for transmitting the stress, a steel rib is correspondingly arranged at the insertion end of the H-shaped web member, and a steel tooth part used for driving the gear to rotate is arranged on the steel rib. The tension sensor arranged in the gusset plate can obtain stress data of the connecting part in real time, the data can enable workers to take measures before the structure is seriously damaged or fails, and the early warning capacity of bridge potential safety hazards is greatly improved.

The invention discloses a hydraulic engineering construction potential safety hazard monitoring system based on the Internet of Things, relates to the technical field of hydraulic engineering construction, and solves the problem that a systematic potential safety hazard monitoring mode is not adopted for comprehensive monitoring. The method comprises the following steps of: acquiring an external stress change curve, locking an abnormal section with regular change in time in the change curve on the basis of a corresponding analysis process, and optimizing and calibrating the abnormal section on the basis of a standard value confirmed in the curve, so that the influence of external waves on the stress hidden danger monitoring process is avoided, and a relatively accurate external stress change curve is obtained; and then the potential safety hazard is determined based on the difference value change condition of the external stress and the internal stress confirmed at the same time, so that the accuracy of the numerical value can be effectively guaranteed in the potential safety hazard determination mode, and a relatively comprehensive potential safety hazard monitoring effect can be achieved.

The invention discloses a high arch dam deformation state fractional order numerical analysis method and module, and relates to the technical field of hydraulic structure service state analysis and computational mechanics. The method comprises the following steps: establishing a high arch dam body and dam foundation fractional order rheological mechanical element model by constructing a fractional order characterization method of attenuation rheological, steady-state rheological and accelerated rheological in a three-dimensional stress state; calculating an internal stress increment, a viscoelastic strain increment, a viscoplastic strain increment and a deformation increment in a delta tn time period by adopting a front difference formula according to the stress, the viscoelastic strain, the viscoplastic strain and the deformation at the tn moment by virtue of an increment finite element method, so as to obtain the stress, the strain and the deformation at the tn + 1 moment; and repeatedly calculating to obtain the stress, strain and deformation of the high arch dam in the analysis time period. According to the method, the nonlinear rheological effect of the dam body and the dam foundation of the high arch dam is objectively described, scientific deformation property numerical value quantitative analysis is achieved, technical support is provided for safety monitoring and dangerous case early warning of the in-service high arch dam, and the method has wide application prospects and market prospects.

The invention discloses a free filling type metal wire embedded solid propellant forming device and process, and belongs to the field of solid propellants, the free filling type metal wire embedded solid propellant forming device comprises a bottom plate, a base, a mold cylinder and a top cover are sequentially arranged on the bottom plate, and a plurality of pressing structures are arranged on the upper portion of the top cover; a solid propellant coating barrel is arranged on the inner wall of the mold barrel; the lower end of the metal wire is fixed on the bottom plate, the upper end of the metal wire is fixed on the first fastener of the fastener mounting block on the top cover, and the first fastener is screwed into the threaded hole, so that the metal wire can be tensioned, and the internal stress of the metal wire can be adjusted by adjusting the expansion amount of the metal wire; according to the invention, the collimation of the metal wire in the propellant is ensured, the proper stress of the metal wire in the slurry casting process is also ensured, the problem that the metal wire is broken due to overlarge stress is avoided, and the technical problem that the yield of the solid propellant is low due to the fact that the metal wire is easy to break in the propellant in the prior art is solved.

The invention discloses a temper mill bottom plate machining method which comprises the following specific steps that S100, appearance inspection is conducted on a bottom plate blank, and whether cracks and sand hole defects exist on the surface or not is checked; proper machining allowance is reserved according to the design size of the bottom plate; s200, a horizontal boring and milling machine is adopted, a hard alloy cutter is selected, and rough machining is conducted on the base plate blank in a multi-cutter and multi-blade milling mode; s300, the base plate obtained after rough machining is placed in an aging treatment furnace, the temperature is increased to 550-600 DEG C at the speed of 50-60 DEG C per hour, heat preservation is conducted for 4-6 hours, then the base plate is slowly cooled to the room temperature at the speed of 30-40 DEG C per hour, and therefore internal stress generated by rough machining is eliminated; s400, a horizontal boring and milling machine is adopted for conducting semi-finish machining on the bottom plate subjected to aging treatment; s500, carrying out vibration aging treatment on the semi-finished bottom plate by adopting vibration aging equipment; and S600, a high-precision numerical control grinding machine and a boring and milling machine are adopted for conducting finish machining on the bottom plate subjected to vibration aging treatment.

The invention discloses a straight bar splicing type stator core for a frameless torque motor, and relates to the field of stator cores, the straight bar splicing type stator core comprises a stator core body, the initial state of the stator core body is a straight bar shape, stator core split bodies are arranged in a straight line, the inner side projection of the stator core body is provided with a stator core tooth part, and the inner side projection of the stator core body is provided with a stator core tooth part. Coils are sequentially wound on the tooth parts of the stator core, and after the coils are wound, the stator core body is subjected to integral circle surrounding welding. According to the straight bar splicing type stator iron core for the frameless torque motor, the stator iron core body adopts a straight bar type design, the split structures of the stator iron core body are arranged in a straight line, and the connection part of each split body is provided with a process hole which is specially used for eliminating internal stress generated in the manufacturing and operation processes, so that the production process is simplified, the production efficiency is improved, and the production cost is reduced. And the uniformity and the stability of the iron core are ensured, the stress concentration is effectively reduced, the production speed and the production efficiency are improved, meanwhile, the manual intervention requirement is reduced, and large-scale manufacturing is facilitated.

The invention discloses a multispectral image and LiDAR fusion method suitable for dam body deformation monitoring, and belongs to the field of hydraulic engineering safety monitoring. According to the method, a dam body surface multispectral image and three-dimensional point cloud data are obtained through an unmanned aerial vehicle, and crack spectral features and structural joint geometric features are extracted after processing; constructing a CNN and finite element coupling model, inputting the surface displacement field after feature fusion into the finite element model, and simulating internal stress-strain distribution in combination with material parameters; and analyzing the space-time correlation between the surface displacement and the internal stress, optimizing parameters by combining measured data, and outputting a deformation correlation result. According to the invention, all-directional correlation monitoring of the surface and internal deformation of the dam body is realized, the limitation of a single data source is overcome, the monitoring precision and reliability are improved, and support is provided for safety assessment of the dam body.

The invention relates to a production line for continuous production of sofa iron stands, which comprises an upper wheel die holder, a lower wheel die holder is clamped at the bottom end of the upper wheel die holder, a driving shaft is fixedly connected to the inner ends of the upper wheel die holder and the lower wheel die holder, and a workpiece is arranged at the outer end of the upper wheel die holder in a contact manner. The top end of the bending arm is in sliding connection with a hydraulic sliding block, the top end of the hydraulic sliding block is in sliding connection with a servo sliding block, the resilience force of a bent workpiece can be monitored through the detection device, accurate bending compensation is conducted, the resilience phenomenon of the workpiece caused by material characteristics is effectively compensated, and the size precision of a finished product is improved; according to the bending compensation device, the product quality and consistency are guaranteed, the stress relieving assembly conducts induction heating on the bent portion of the workpiece during bending compensation, internal stress is eliminated, secondary springback is prevented, meanwhile, the possibility that the workpiece deforms in the follow-up use process is reduced, the durability and reliability of the product are enhanced, and the overall performance of the product is improved.

The invention relates to the technical field of cutting machining, in particular to a planetary gear carrier cutting machining device and method capable of reducing machining errors, and the method comprises the steps that after rough turning machining is conducted on a planetary gear carrier in an RV speed reducer, the influence of the self-balance phenomenon of residual stress on stress relief is analyzed, and the machining error is reduced; establishing an influence relational expression of residual stress elimination; determining a dynamic switching strategy in the butterfly optimization algorithm based on the distribution of the feature points in the correlation curve of the three parameters; and determining optimal variables in different stages by using a butterfly optimization algorithm in combination with an influence relational expression of the internal stress self-balancing phenomenon of the planetary gear carrier structural member under the parameters on stress distribution, and performing subsequent processing on the obtained planetary gear carrier structural member to obtain the planetary gear carrier. The method aims to eliminate the residual stress of the planetary gear carrier subjected to rough turning, and the cutting machining error is reduced.

The invention relates to the technical field of shaping of wind power main shaft type bearing rings, in particular to a cylindrical roller bearing ring shaping process, which comprises the following steps: respectively measuring the diameter variation of the outer diameter of the bearing ring close to two end surfaces, and if the diameter variation of only one side is greater than or equal to a standard deformation threshold value, determining that the cylindrical roller bearing ring is shaped. The top taking type tool is installed at the position, with the minimum diameter, of the end of the bearing ring so that the short shaft can be reversely deformed into the long shaft, if the diameter variation of the two sides is larger than or equal to the standard deformation threshold value, the top taking type tool is installed at the position, with the minimum diameter, of the middle of the bearing ring so that the short shaft can be reversely deformed into the long shaft, and shaping and tempering are conducted; respectively measuring the diameter variation for the second time; and if the diameter variation of the two sides is smaller than the standard deformation threshold value, it is judged that the tempering is qualified, and the tempering is completed. The shaping process comprises two times of tempering, the internal structure of the part of the bearing ring can be effectively stabilized, the internal stress is reduced, and the bearing part with the stable size is obtained.

The air entraining pipeline can transmit hot air in a heat insulation mode and can release thermal deformation of the pipeline, and internal stress of the structure is reduced. A hot air anti-icing system can reduce heat loss of hot air flow passing through an air inlet cabin. The gas guiding pipe comprises an inner-layer pipe wall and an outer-layer pipe wall, a heat insulation structure is arranged between the inner-layer pipe wall and the outer-layer pipe wall, the inner-layer pipe wall comprises a floating section, and the floating section comprises a first pipe end and a second pipe end which are in lap joint with each other and are in sliding fit. One end of the corrugated pipe is connected with the first pipe end, the other end of the corrugated pipe is connected with the second pipe end, and the corrugated pipe covers the lap joint position between the first pipe end and the second pipe end.

The invention relates to a method and a device for eliminating stress of a metal thin strip in heat treatment, which are characterized in that: 1) a large-tension metal thin strip conveying mechanism is arranged in a heat treatment furnace of the metal thin strip, and the metal thin strip conveying mechanism keeps tension of 3-6 tons in a workpiece conveying process; and (2) the tension borne by the workpiece is kept to be 3-6 tons through a tension control mechanism of the large-tension metal thin strip conveying mechanism, so that the internal stress of the workpiece disappears in the conveying process, namely the tension borne by the workpiece in the conveying process is kept to be constant to be 3-6 tons, and the internal stress of the workpiece is eliminated when the workpiece passes through the process section of the heat treatment furnace. The large-tension metal thin strip conveying mechanism comprises an unwinding mechanism, a winding mechanism and a tension control mechanism, and the tension between the unwinding mechanism and the winding mechanism is controlled to be 3-6 tons constantly through the tension control mechanism, so that a large-tension control structure is formed. The device has the characteristics of simple structure, low cost, good stress eliminating effect and the like, and prevents the copper strip from vibrating and the workpiece from deforming.

The invention discloses a long glass fiber compression molding method and system, and the method comprises the steps: laying a continuous glass fiber plate and a long glass fiber material ball in a mold cavity in a partitioned manner, and obtaining a positioned composite green body; local prepressing is applied to the interlocking area of the composite blank, a mechanical meshing structure is formed, and a prefabricated body with an interface interlocking structure is obtained; establishing a pressure distribution model according to the geometric characteristics of the product to obtain differentiated pressure parameter combinations; placing the preform in a heating mold, and applying pressure in stages according to the pressure parameter combination to obtain a semi-finished product without glass fiber exposure; and for the semi-finished product, under the state that the second pressure value is kept, rapid cooling is conducted on the flange and the corner area, slow cooling is conducted on the large face area, and a final product with the balanced internal stress is obtained. By utilizing the embodiment of the invention, the efficient synergy of the continuous glass fiber plate and the long glass fiber material block can be realized, and the mechanical property and the structural integrity of the product are improved.

The invention relates to a mechanical metamaterial structure based on a six-rod and six-cable tensegrity structure, and belongs to the field of mechanical metamaterials, the mechanical metamaterial structure comprises a six-rod and six-cable tensegrity cell structure, and the tensegrity cell structure comprises corner assemblies, first connecting shafts, fixing rings and middle tensegrity assemblies; under the action of the middle tensioning assembly, when the structure is not subjected to an external load, the structure is subjected to interaction of internal stress, and the balance is achieved in a self-stabilization state; under the state of being subjected to an external load, the structure can generate self-adaptive deformation; and the external load is removed again, and the structure can recover to the initial state. The mechanical metamaterial structure based on the six-rod six-cable tensegrity structure has the advantages of adaptivity, isotropy, negative Poisson's ratio and the like, the tensegrity structure and the mechanical metamaterial structure are combined, and the types of existing mechanical metamaterial cell element structures are enriched; and a brand new direction is opened up for the design, analysis and application of the tensioning mechanical metamaterial structure.