15results about How to "Avoid residual stress" patented technology

The invention provides a composite structure bridge system based on steel and concrete and a construction method. A composite beam comprises a bridge deck slab and a composite rib plate located on the bottom face of the bridge deck slab, the composite rib plate comprises a concrete rib plate and a steel beam, and the concrete rib plate is located between the bridge deck slab and the steel beam; the standard simply supported beam comprises a plurality of composite beams arranged in the longitudinal bridge direction, and the adjacent composite beams are connected through inter-beam connecting structures. The standard simply-supported unit comprises a plurality of standard simply-supported beams arranged in the transverse bridge direction, and every two adjacent standard simply-supported beams are connected through a longitudinal wet joint; every two adjacent standard simply-supported units are connected through a pier top connecting structure to form a continuous structure system. The problem of how to quickly splice the composite beams on site to form a bridge structure system is solved, the composite beams can be prefabricated in sections and transported by a conventional expressway, centralized prefabrication and large-radius logistics distribution of the composite beams in a factory can be realized, and the commercialization circulation process of the small and medium span composite beams is promoted.

The invention belongs to but is not limited to the technical field of nickel-based alloy additive manufacturing, and discloses a heat treatment method and system for reinforcing and toughening an additive-formed heterogeneous nickel-based alloy, and the chemical components of the additive-manufactured nickel-based alloy are qualitatively and quantitatively analyzed by utilizing EPMA; carrying out homogenization heat treatment design by utilizing Thermo-Calc software; based on the obtained heat treatment temperature and dendritic crystal spacing, a linear curve of distribution of elements along with time diffusion is obtained, and the optimal temperature and time of homogenization heat treatment of the nickel-based alloy are obtained; and respectively calculating TTT phase diagrams corresponding to dendritic crystal nuclei and interdendritic crystal regions by utilizing a TTT phase diagram module in JMatPro software, and obtaining the optimal temperature and time of the stress relief heat treatment of the nickel-based alloy based on the characteristics of the precipitated phase of the nickel-based alloy. According to the method, a uniform grain structure is obtained after the material is rapidly cooled, the residual stress level in a component is reduced, and the strength and toughness of the material are improved.

The invention discloses a plate creep forming and annealing softening coupled shape righting device and a straightening method.The method comprises the steps that firstly, softening curves of annealing of an aluminum alloy plate at different temperatures are obtained, and the softening annealing temperature and time at which the hardness reduction proportion does not exceed 5% are selected according to the softening condition; the metallographic structure before and after annealing and softening treatment is basically kept stable, so that the influence of shape correction on the product performance is reduced; according to the thickness of the plate, the initial bending degree and the annealing temperature, the reasonable downward-pressing arc radius is designed, the aluminum alloy plate is loaded on a shape correcting mold and is heated to the annealing temperature along with a furnace, and the aluminum alloy plate is under the loading condition lower than the yield stress in a short time; annealing softening and creep deformation occur synchronously in the process of keeping the loading force and the temperature. The aluminum alloy plate treated through the method is small in residual stress, the residual curvature of each section of the plate is uniform, and the influence on the performance of a plate product is small.

Disclosed is a substrate processing apparatus including: a heating unit including a heating plate for supporting and heating a substrate; and a pressure reduction unit for applying a vacuum pressure to a space between a top surface of the heating plate and the substrate supported on the heating plate, in which the heating plate is provided with a lifting hole that is a movement channel for a lifting pin to lift the substrate supported on the heating plate, and the top end of the lifting hole is arranged at a position higher than the top surface of the heating plate.

The invention provides a non-equal-wall-thickness lightweight carbon fiber honeycomb core and a preparation method thereof. The carbon fiber honeycomb core is a non-equal-wall-thickness carbon fiber honeycomb core. The carbon fiber honeycomb core is formed by assembling a plurality of discretized same polygonal cell units in an array; the boundary dimension of the carbon fiber honeycomb core can be infinitely expanded by adopting the polygonal cell units; the structure of each polygonal cell unit is a hollow structure penetrating through the upper and lower ends. According to the carbon fiber honeycomb core assembled by the discrete array, the carbon fiber honeycomb core with any structural size can be obtained as required, the breadth of the carbon fiber honeycomb core can be expanded infinitely, and the size requirement of a large-aperture satellite antenna reflector is met.

The invention discloses a method and a system for leveling a coil steel metal plate for frame production. The method comprises the following steps: acquiring initial stress distribution data and thickness deviation data of the coil steel metal plate; on the basis of the initial stress distribution data and the thickness deviation data, personalized leveling process parameters are generated by adopting a finite element analysis model; a plurality of leveling roller sets of the leveling system are controlled according to the personalized leveling process parameters to conduct graded pressurizing and leveling, and meanwhile surface flatness data of the metal plate are collected in real time through a laser displacement sensor; and the flatness data collected in real time is compared with a preset standard, and the pressure, the rotating speed and the interval parameters of the leveling roller set are dynamically adjusted. According to the method, personalized technological parameter generation and dynamic closed-loop control are combined, the problems that a traditional leveling method is poor in adaptability to coil steel metal plates in different states, low in leveling precision and prone to secondary stress damage are solved, the leveling efficiency and the finished product quality are remarkably improved, and the rejection rate of follow-up machining of a vehicle frame is reduced.

The invention provides an RO (reverse osmosis) device assembly mounting and positioning method and system based on a total station, and relates to the field of water purification. The RO device assembly mounting and positioning system based on the total station comprises a high-precision automatic tracking total station, a special optical reflection target and adapter, an integrated control terminal, a communication unit and power supply and auxiliary equipment. By ensuring natural centering of all components, residual stress generated in a pipeline, a flange and a container due to forced correction is avoided, the long-term operation risk caused by stress corrosion and fatigue cracking is fundamentally eliminated, accurate flange centering and parallelism control are achieved, it is ensured that a gasket is evenly stressed, and the service life of the gasket is prolonged. The probability of leakage in operation is greatly reduced, the intrinsic safety of the system is improved, the system converts complex space judgment into simple locating operation according to pictures, ordinary workers can complete high-precision operation under guidance, and the pressure of shortage of professional skill talents is relieved.

The utility model discloses a kind of reinforcing member's cylinder forging, it is related to mechanical manufacturing and metal forming technical field.The utility model includes cylinder forging, annular reinforcing rib is arranged on the outer surface of cylinder forging, internal reinforcing mechanism is arranged in the inside of cylinder forging, and the internal reinforcing mechanism includes longitudinal reinforcing rib being arranged in the inside of cylinder forging.The utility model is by the thread pre-tightening cooperation of pressing ring, fixed rod and reinforcing ring, the weldingless installation of internal longitudinal reinforcing rib is realized, the pressing ring with fixed rod is placed into cylinder forging, axial pre-tightening force is generated by screwing bottom reinforcing ring, so that longitudinal reinforcing rib is stably pressed between pressing ring and reinforcing ring, forms space support frame, this assembly mode not only effectively avoids the thermal damage and residual stress caused by welding, so that component has complete mechanical property, realizes the detachable function of internal reinforcing structure, effectively improves the maintainability and working condition adaptability of cylinder forging.

The utility model discloses an efficient target material automatic welding device which comprises a working table, two material carrying platforms installed on the working table, a welding flux coating mechanism and a mechanical arm, heating areas are arranged in the middles of the two material carrying platforms, and meanwhile positioning mechanisms are installed on the two material carrying platforms. The positioning mechanism is used for positioning the back plate placed on the material carrying platforms in a heating area, one material carrying platform is used for carrying out stepped heating on the back plate so that welding flux on the back plate can be melted, and the other material carrying platform is used for carrying out stepped cooling on the back plate so that the welding flux on the back plate can be solidified; the solder coating mechanism is erected on the workbench, and the solder coating mechanism is used for uniformly coating molten solder on the back plate; the mechanical arm is used for grabbing the target material and the back plate to conduct feeding and discharging operation and further used for transferring the target material and the back plate from one material carrying platform to the other material carrying platform. The welding precision and the production efficiency can be improved.

The application relates to the technical field of welding processing, in particular to a modular assembly type welding tool process for an extra-high voltage iron tower. The process comprises three stages: a macroscopic disturbance position searching and assembly stress elimination stage, a position-parameter collaborative control stage in a welding process and a closed-loop feedback and rigidity model updating stage. The three stages solve the problems of large tool assembly stress, poor weld forming and model lag existing in the prior art, realize the whole-process closed-loop control logic of "macroscopic disturbance position searching-position parameter collaboration-closed-loop rigidity updating", and significantly improve the dimensional accuracy and structural reliability of the modular welding of the extra-high voltage iron tower.

This application discloses a screen printing process and a UTG protective film applicable to UTG. The screen printing method for UTG includes the following steps: S1, surface cleanliness treatment of the ultra-thin flexible glass; S2, printing an ink layer around the periphery of the layer to be printed on the ultra-thin flexible glass. The ink layer is formed by an ink comprising the following components by weight: acid-resistant epoxy resin: 48-52 parts; acid-resistant pigment: 13-17 parts; alcohol ether solvent: 27-31 parts; leveling agent: 0.4-0.6 parts; defoamer: 0.4-0.6 parts; curing agent: 4-6 parts; S3, curing the ultra-thin flexible glass printed with the ink at a temperature of 80℃-110℃. After curing, the thickness of the ink layer is 0.5μm–1μm. This application can form an ink layer of 0.5μm–1μm and ensures reliable bonding between the ink layer and the ultra-thin flexible glass, solving the technical problem of ink layer easily detaching after repeated bending.

The application discloses a manufacturing method of a ceramic micro-flow channel carrier for high-power devices and relates to the field of ceramics. The manufacturing method comprises the following steps: after punching a green ceramic sheet, tungsten slurry is used to fill the holes and conductor patterns are printed on the surface of the green ceramic sheet; then, a bottom plate micro-flow channel layer is laminated and a sacrificial material is filled in the micro-flow channel cavities; then, the bonding interface between the cover plate and the bottom plate is subjected to ultraviolet laser roughening treatment; then, two-step isostatic pressing forming treatment is performed; after cutting into a bar, the bar is subjected to glue removal, sintering, hot pressing leveling, grinding, polishing and seed layer deposition; then, exposure development is performed and the line layer is thickened by electroplating; then, secondary photolithography processing is performed on the chip eutectic area to open a window; finally, gold tin evaporation treatment, stripping of the photoresist and cutting are performed, so that the ceramic micro-flow channel carrier for high-power devices is obtained. According to the specific manufacturing process, the mechanical strength, the dielectric property, the heat fatigue resistance and the micro-flow channel pressure resistance are improved while the heat dissipation property is maintained.

The utility model relates to a copper pole copper ingot cooling device belongs to copper pole cooling field, including workspace, rotation connection in the crystallization wheel group of workspace and be used to the cooling mechanism of crystallization wheel group cooling, the crystallization wheel group includes rotation connection in the crystallization wheel of workspace and the steel band distribution of around crystallization wheel, through setting up the steel band cooling spare, wheel inner ring cooling spare and wheel end surface cooling spare around crystallization wheel, carry out the cooling of zoning to steel band, crystallization wheel inner ring and crystallization wheel end surface respectively, can control independently the cooling temperature and the flow rate, flow of cooling fluid of different zoning of crystallization wheel or steel band, realize the cooling control of different temperature of copper pole copper ingot in different crystallization cooling stage, to improve the production performance of copper pole copper ingot, avoid residual stress and crack.

This utility model discloses a tooling for winding rebar cages for utility poles, relating to the field of tooling technology. The utility model includes a frame, with a mandrel mounted on the top of the frame; a guide assembly is also mounted on the top of the frame, comprising a guide rail fixedly connected to the top of the frame, a gear movably connected to one side of the guide rail, and a chain meshing with the surface of the gear. By providing a guide assembly that can move along the guide rail, this utility model allows the rebar feed reel to move synchronously with the winding process, effectively reducing stress concentration in the rebar during winding. The dynamic feeding method avoids the problem of excessive rebar stretching caused by traditional fixed feeding, preventing plastic deformation and residual stress, significantly improving the overall strength and durability of the rebar cage. A drive motor drives the guide frame to move at a uniform speed through a gear and chain mechanism, combined with the mandrel rotation controlled by a servo motor, achieving uniform winding of the rebar.

The application provides a method for connecting titanium aluminum carbide and niobium by adopting a titanium intermediate layer and a connected joint, and relates to the technical field of welding. The method comprises the following steps: S1, preparing a component to be connected; the component to be connected is formed by sequentially stacking titanium aluminum carbide base material, an intermediate layer and niobium base material from top to bottom, and the material of the intermediate layer is titanium; S2, performing discharge plasma sintering on the component to be connected under a preset air pressure to obtain a connected joint. By adopting the method, the cracking of the joint can be inhibited, the decarburization or Al evaporation of Ti3AlC2 at high temperature can be inhibited, thereby the deterioration of the base material is inhibited; the generation of brittle intermetallic compounds can be avoided, which is helpful to improve the interface bonding strength, thereby the strength of the connected joint is improved.