67 results about "Pre stretching" patented technology

The invention relates to the technical field of inductors, in particular to an inorganic insulation integrally-formed power inductor and a preparation method thereof. The method comprises the following steps: S1, selecting a coil; s2, pre-stretching the coil; s3, pre-coating of inorganic powder is carried out; s4, pressing the magnetic powder; s5, sintering the ceramic layer at high temperature; and S6, integrally forming the inductor. By reasonably selecting the material and shape of the coil and the type of the magnetic powder and combining high-temperature sintering at the temperature of 250 DEG C or above, the magnetic conductivity and the bias resistance are improved, the diversified requirements of high frequency, high temperature, high power density and the like are met, and the performance of insulation, heat conduction and the like can be optimized; according to the integrated forming process, coil pre-packaging and magnetic core forming are completed in one step, production procedures are reduced, process integration and production efficiency are improved, production cost is reduced, the utilization rate of a magnetic core window reaches 100%, and the product size is reduced.

The lead screw pre-stretching mechanism for the numerical control machine tool comprises a lead screw, a tail end bearing seat is arranged at the end of the lead screw, the tail end bearing seat comprises a tail end bearing sleeve, a plurality of first bearings, a first gasket, a load cell, a load cell gasket, a disc spring and a first outer spacer ring, and the first bearings, the first gasket, the load cell, the load cell gasket, the disc spring and the first outer spacer ring are located in the tail end bearing sleeve. The disc spring, the load cell gasket and the load cell are sequentially arranged on the first outer distance ring in a sleeved mode, the end of the tail end bearing sleeve is bent to form a contact step, the two ends of the disc spring abut against the contact step and the load cell gasket respectively, the end of the lead screw sequentially penetrates through the first outer distance ring, the first gasket and all the first bearings, and the load cell is tightly attached to the first gasket. The first gasket is tightly attached to the first bearing, and the end of the lead screw is exposed out of the tail end bearing seat and provided with a locking nut. The disc spring can well balance the pre-stretching force of the lead screw and the pre-tightening force of the tail end bearing seat, automatic compensation of thermal elongation of the lead screw can also be achieved, and high precision and high stability are provided for a transmission system of a machine tool.

The invention discloses a heat treatment process for a high-elongation aluminum alloy plate, and particularly relates to the field of aluminum alloy material processing, and the heat treatment process comprises the following specific heat treatment steps: S1, component design preparation, S2, low-temperature solution treatment, S3, pre-stretching optimization and S4, graded aging. According to the invention, through a synergistic process of combining low-temperature solution treatment, pre-stretching optimization and graded aging, the contradiction between the strength and the elongation of the aluminum alloy plate is successfully solved, the strength of the aluminum alloy plate is maintained while the elongation of the aluminum alloy plate is remarkably improved, a high-performance aluminum alloy material solution is provided for lightweight of automobiles, and the application prospect is wide. Wide market prospects and industrial application values are realized; and although the steps of pre-stretching and grading aging are added, the energy consumption is saved by reducing the solid solution temperature, and the comprehensive production cost is equivalent to that of a traditional process.

The invention relates to a plate three-point incremental forming track designing and forming method. The method comprises the following steps that S100, a two-point incremental forming track is generated according to a three-dimensional model of a target part; s200, the track is divided into two areas, the two parts of the track are achieved through two forming tools (2 and 3) respectively, and the connecting line of cutter location points of the two forming tools at the same moment always passes through the same central symmetry axis; s300, a simple support (7) is installed, the periphery of the plate (8) is clamped, a forming tool is installed, and tool setting is conducted; s400, pre-stretching is applied to the plate, and then the two execution tail ends of the machining equipment are made to run according to the tracks of the two forming tools correspondingly to machine the plate; and S500, after machining is completed, the clamping force is removed, and the formed workpiece is taken down. Three-point constraint is formed on the plate through the simple support and the two forming tools, the overall deflection and shaking of the plate during forming are remarkably reduced, and then the geometric accuracy of a final part is improved.

The invention discloses an aluminum alloy high-rib ultrathin skin component forming method which comprises the following steps: carrying out solid solution, water quenching and pre-stretching on an aluminum alloy plate to obtain a quenched flat and straight aluminum alloy plate, and processing the quenched flat and straight aluminum alloy plate into an aluminum alloy plate blank; the aluminum alloy plate blank is subjected to roll bending to obtain a cone part, and the cone part is subjected to cold-heat cycle treatment; the cone part obtained after cold-heat cycle treatment is milled, and vertical ribs and skin of the component are machined; and the member obtained through milling is subjected to creep age forming treatment, and the aluminum alloy high-rib ultra-thin skin member is obtained. According to the method, the component forming precision is high, the final residual stress is small, and the method has important guiding significance on forming of the high-performance large-scale integrated high-rib ultra-thin skin component.

The preparation method of the aluminum-lithium alloy profile with the high batch stability comprises the following steps that forging is conducted, specifically, an aluminum-lithium alloy cast ingot is heated and then forged, and the single-pass upsetting deformation of upsetting and drawing during forging is 60-75%; extrusion: heating the forged blank, the extrusion container and the die, and then carrying out extrusion treatment; solid solution quenching: carrying out solid solution quenching treatment on the blank subjected to extrusion treatment to obtain a profile; low-temperature heat preservation is conducted, specifically, the profile obtained after solution quenching treatment is subjected to low-temperature heat preservation treatment, the temperature ranges from 0 DEG C to 5 DEG C, and the heat preservation time is not shorter than 30 min; and carrying out pre-stretching and aging treatment on the profile subjected to low-temperature heat preservation treatment. According to the invention, the production efficiency can be improved, and the aluminum-lithium alloy material with high batch stability and excellent performance can be prepared, so that the requirements of a new generation of airplanes on the profile can be better met.

The invention relates to the technical field of alloys, in particular to a high-strength and high-toughness aluminum alloy and a preparation method thereof. The aluminum alloy is prepared from, by mass, 7.6%-8.2% of Zn, 1.9%-2.4% of Mg, 1.6%-2.4% of Cu, 0.10%-0.25% of Mn, 0.08%-0.18% of Zr, 0.01%-0.06% of Sc and the balance Al. The preparation method comprises the steps of ingredient smelting, combination of two-stage homogenization treatment and intermediate thermal deformation, hot rolling, solution treatment, cryogenic treatment, high-temperature treatment, re-water quenching, low-temperature pre-aging, pre-stretching, graded aging and the like in sequence. By optimizing microalloying elements and a composite heat treatment process, recrystallization coarsening and grain boundary continuous precipitation are effectively inhibited, the fracture toughness and stress corrosion resistance of the aluminum alloy are remarkably improved while high strength is kept, and the aluminum alloy is suitable for force-bearing components such as aerospace components.

Method for monitoring a thermoforming process designed to form a large number of articles in a single layer of material (10), the method comprising: Recording at least two measured values ​​at at least two mold cavities (160, 160a, 160b, 160c), wherein at least one measured value is recorded at each of the at least two mold cavities (160, 160a, 160b, 160c), which indicates a stretching force or stretching energy to be applied when pre-stretching the material layer (10) into the respective mold cavity (160, 160a, 160b, 160c); and Comparing the measured values ​​recorded at the at least two forming cavities (160, 160a, 160b, 160c) to obtain a comparative result, the comparative result being an indicator of the homogeneity of the thermoforming process.

The present application relates to the technical field of machining, and discloses a segmented type bundling and stretching forming equipment for large-curvature roller coating hyperbolic aluminum plate, which comprises the following steps: establishing a distributed material gene library, designing a material parameter verification and correction mechanism, calibrating parameters, and triggering model retraining when continuous abnormalities occur; establishing an environmental influence coefficient matrix, calculating actual yield strength, strain threshold and pre-stretching force; collecting aluminum plate surface images in real time; dynamically adjusting stretching parameters, optimizing stretching speed to control stretching force loading; reconstructing a strain field in real time, and designing a self-adaptive termination mechanism; inputting material and strain parameters to predict critical curvature, calculating square tube structure parameters, calculating initial pressure and optimizing pressure; designing a multi-stage stretching and pressure maintaining process, and reducing pressure of a corresponding area if local strain exceeds a limit; controlling progressive unloading by using an exponential decay curve, detecting residual stress, performing full-size detection, analyzing deformation deviation, solving optimal parameters, and updating a parameter library.

The invention discloses a method for pre-stress fatigue reinforcement of a steel structure through a local additive and subtractive Fe-SMA component, firstly, the position, needing to be reinforced, of the steel structure is subjected to surface treatment, then the Fe-SMA component is installed, and the Fe-SMA component comprises a Fe-SMA component and additive parts which are arranged at the two ends of the component and used for being connected with the surface of the steel structure or an anchoring assembly in a matched mode. The Fe-SMA components can be pre-stretched to reach preset strain, and active prestress is applied to the to-be-reinforced structure in a thermal excitation mode by utilizing the shape memory effect of the Fe-SMA materials. And the novel intelligent material Fe-SMA is used, so that the fatigue performance of the structure is improved. And meanwhile, the shape memory effect of Fe-SMA can be utilized, prestress can be applied to the to-be-reinforced structure in a thermal excitation mode, and the safety of the to-be-reinforced structure is greatly improved.

The invention provides a 7xxx series aluminum alloy plate strip for anodic oxidation with a high recovery ratio and a preparation method of the 7xxx series aluminum alloy plate strip. The 7xxx series aluminum alloy plate strip comprises the following elements of 0.06%-0.12% of Si element, 0.10%-0.25% of Fe element, 4.5%-5.5% of Zn element, 2.0%-3.0% of Mg element, 1.2%-2.0% of Cu element, 0.05%-0.15% of Mn element, 0.10%-0.15% of Er element, 0.10%-0.12% of Zr element, 0%-0.03% of Ti element and the balance aluminum element. The aluminum alloy plate strip is prepared through the steps of reclaimed material grading pretreatment, low-liquid-level semi-continuous casting, multi-stage homogenizing heat treatment, hot rolling, cold rolling, solid solution, pre-stretching, two-stage aging and the like. Through joint optimization of material components and the process, the finished plate strip has excellent mechanical performance, an oxidation film is uniform in color and luster, and salt mist resistance, friction resistance and the like are achieved.

The multi-force-source progressive die is used for machining a material sheet into a flexible gear blank, the flexible gear blank comprises a barrel and a flange, a barrel opening in one end of the barrel is connected with the flange, a feeding channel is formed between an upper die base and a lower die base, and when the upper die base and the lower die base are closed, the feeding channel is connected with the flange. The first female die assembly and the first male die assembly pre-stretch a material sheet to form a boss, the second female die assembly and the second male die assembly conduct contour shaping on the boss formed through pre-stretching, and the third female die assembly and the third male die assembly punch a center hole in the boss subjected to contour shaping. The multi-force-source male die assembly and the multi-force-source female die assembly apply shearing force and drawing force which are opposite to each other to a material piece with a punched center hole, a flange is punched through the shearing force to achieve blanking, and a boss with the center hole is drawn into a cylinder through the drawing force. According to the scheme, through the synergistic effect of multiple force sources, die abrasion is reduced, the service life is prolonged, and the size precision and shape precision of the flexible gear blank can be guaranteed.

The invention relates to a forming process of an automobile hinge support. The forming process comprises the steps of material shearing, five-time pre-stretching, first-time shaping, edge cutting, flanging shaping, punching, second-time shaping and inspection and warehousing. According to the forming process of the automobile hinge support, the standard production requirement is met after multiple times of stretching and shaping, the quality of produced products is stable, the percent of pass reaches 99.2%, and the production efficiency is high.

The invention discloses a strengthening method and a preparation process of a high-strength corrosion-resistant aluminum alloy, and relates to the technical field of aluminum alloy materials.The strengthening method comprises the following steps that 1-3% pre-stretching treatment is conducted on a 7-series aluminum alloy profile obtained after solid solution quenching, and a dislocation network with the dislocation density larger than or equal to 10 < 14 > m <-2 > is introduced; by controlling specific chemical components of the 7-series aluminum alloy, a foundation is laid for high performance of the material, by means of a pre-stretching-aging synergistic process, residual stress is released through plastic deformation in pre-stretching, follow-up machining deformation and stress corrosion cracking risks are reduced, a dislocation network formed by pre-stretching provides a large number of uniform nucleation points for a strengthening phase, and the stress corrosion cracking risk is reduced. By combining two-stage aging and stretching regulation, uniform dispersed precipitation of a nanoscale eta'phase is promoted, generation of a thick eta phase is inhibited, meanwhile, the nucleation tendency of a strengthening phase at a grain boundary is reduced, a fine discontinuous grain boundary precipitated phase and a narrow lean solute region are formed, intergranular corrosion resistance and exfoliation corrosion resistance are remarkably improved, and balance of strength, toughness and corrosion resistance is achieved.

The invention relates to the technical field of steel plate wall manufacturing, in particular to anti-deformation steel plate wall manufacturing equipment which comprises a bottom frame, a moving assembly and the like. A plurality of moving assemblies are fixedly connected to the bottom frame. A steel plate is transversely stretched through the four electromagnets, meanwhile, the two electromagnets on the upper portion and the two electromagnets on the lower portion move oppositely, and therefore the steel plate is longitudinally stretched through the four electromagnets, two-way pre-stretching is achieved, controllable and uniform pre-stretching stress is applied to the steel plate, and the steel plate can be subjected to two-way pre-stretching. The steel plate is in a slightly tensioned elastic state and then is welded until the steel plate is welded on the keel frame of the wall body, so that the wall body is manufactured, the correction procedure is greatly reduced or even eliminated, the efficiency is effectively improved, the manufacturing cost is reduced, and the production efficiency is improved. And the manufactured wall is low in residual stress, high in size precision and high in flatness, and the safety and reliability of the whole structure are improved.

The application discloses a kind of rotor cup machine shell bearing chamber bearing hole periphery R angle forming local material thickening process, by pre-stretching, main stretching, pre-punching bearing hole, back to mound and shrinkage back mound, final stretching finishing these six steps are completed.The application process optimizes the distribution regulation and control of metal flow in the plastic deformation process of stretching forming material and controls the quantitative flow of material, realizes the integral thickening of the material in the bearing chamber area, realizes the accurate control of material flow, thereby realizes the directional thickening of local material, and the shell product prepared is locally increased in thickness by more than one time of the original material thickness at the bearing hole periphery R angle of bearing chamber, while ensuring that the wall thickness of bearing chamber is only slightly thinned, to ensure that the rotor cup machine shell is completed and the forming quality is improved, and the product reaches higher mechanical strength, dimensional accuracy and surface quality.

The invention discloses a preparation method of a high-zinc small-wall-thickness aluminum alloy profile for aviation, and belongs to the technical field of material science. Preparation: preparing a high-zinc aluminum alloy cast ingot; after two-stage homogenizing annealing, saw cutting and turning are conducted, and after heating, extrusion forming is conducted; and after two-stage solid solution quenching treatment, pre-stretching is conducted, then two-stage aging treatment is conducted, and a T76511-state profile, namely the high-zinc small-wall-thickness aluminum alloy profile for aviation, is obtained. According to the method, the two-stage homogenizing annealing and two-stage solid solution heat treatment processes are adopted, so that the structure property of the profile is more uniform and stable, and it is guaranteed that all properties of a final product meet standard requirements. The prepared high-zinc small-wall-thickness aluminum alloy profile has the advantages of being high in strength, good in corrosion resistance, resistant to corrosion and the like, the average tensile strength of the high-zinc small-wall-thickness aluminum alloy profile is 635 MPa which is 21 MPa higher than the product standard requirement, the average yield strength of the high-zinc small-wall-thickness aluminum alloy profile can reach 610 MPa which is 24 MPa higher than the product standard requirement, the requirement of amphibious aircrafts of special models for high-performance aluminum alloy materials is met, and the high-zinc small-wall-thickness aluminum alloy profile can be widely applied to the field of aerospace.

The utility model discloses a double-oil-cylinder straightening machine with a pre-stretching function. The double-oil-cylinder straightening machine comprises a fixed straightening head and a movable straightening head. The fixed straightening head and the movable straightening head run on the same ground rail; the movable straightening head clamps one end of an aluminum profile to be stretched and moves towards the end, away from the fixed straightening head, of the ground rail, and when the movable straightening head moves to the designated position, the position of the movable straightening head is locked through a tail clamp. The other end of the aluminum profile to be stretched is clamped by the fixed straightening head; the fixed straightening head is provided with a pre-stretching oil cylinder which is used for pre-stretching the bent and deformed aluminum profile to be stretched; the fixed straightening head is further provided with a main stretching oil cylinder, and the pre-stretched aluminum profile is stretched to the set length. According to the double-oil-cylinder straightening machine with the pre-stretching function, the pre-stretching oil cylinders are additionally arranged, and the pre-stretching step is added, so that the stress state of a metal material can be effectively improved, and better conditions are created for subsequent straightening operation.

The utility model discloses a kind of thin permanent magnet brake, including by flange, armature, inner magnetic pole, permanent magnet, magnetic shell coaxial setting composition brake body, the flange is equipped with pre-stretching elastic element between armature, the elastic element continuously pulls armature and moves to flange direction;Permanent magnet and coil are equipped with magnetic shell, the coil diameter is greater than permanent magnet diameter, the permanent magnet is placed inside coil;The permanent magnet is also fixedly connected inner magnetic pole, the inner magnetic pole, permanent magnet, magnetic shell form accommodating groove, the coil is equipped in accommodating groove, the inner magnetic pole and magnetic shell are equipped with at least one gap. The utility model does not destroy the appearance size of brake geometric body, can greatly compress brake thickness, output brake force is big, and performance is more stable.

This utility model relates to the technical field of pre-stretching devices, and discloses a simulated pre-stretching device for enameled wire winding. It includes a base plate, a platform fixedly connected to the top of the base plate, load-bearing components on the left and right sides of the top of the platform, a stretching component between the load-bearing components, and a tension adjustment component at the bottom of the stretching component. The tension adjustment component includes a fixed plate, fixed columns fixedly connected to the left and right sides of the top of the fixed plate, a movable plate on the top of the fixed plate, and multiple buffer springs on the top of the movable plate. Threaded rods are threaded to the four corners inside the fixed plate. In this utility model, when matching the tension threshold of enameled wires of different diameters, the length of the buffer springs is adjusted by rotating the threaded rods. During pre-stretching, the buffer springs absorb tension fluctuations through deformation, avoiding cracking of the enamel layer caused by rigid stretching. This solves the problem of uneven tension easily damaging the wire, improving the pre-stretching quality and yield of the enameled wire.

The invention belongs to the field of aluminum alloy processing, and relates to a method for rapidly reducing quenching residual stress of an aluminum alloy plate, which comprises the following steps: S1, carrying out solid solution quenching treatment on the aluminum alloy plate; s2, the aluminum alloy plate is subjected to primary flattening treatment; and S3, the aluminum alloy plate subjected to primary flattening treatment is subjected to primary cold pressing machining. And S4, the first-pass cold pressing plate is rotated by 85-95 degrees, second-pass cold pressing machining is conducted, and the multi-direction cold pressing plate is obtained. The total deformation amount of the cold pressing processing is 4-5%. And S5, secondary flattening treatment is conducted, and a flattened plate is obtained. And S6, the flat plate is subjected to stepped aging treatment, and the stress-eliminated aluminum alloy plate is obtained. The method for eliminating the quenching residual stress of the aluminum alloy plate is efficient, high in precision and low in cost, solves the problem of low production efficiency of a pre-stretching method in the prior art, and has a wide industrial application prospect.

The invention relates to the technical field of numerical control machine tools, and provides a numerical control machine tool lead screw pre-stretching mechanism and method. The bearing seat and the motor seat are arranged at intervals; the fixed end of the lead screw is rotatably supported on the motor seat, and the stretching end of the lead screw is rotatably supported on the bearing seat; the first gland is mounted at one end, close to the motor seat, of the bearing seat through a fastener; the second gland is arranged at one end, far away from the motor seat, of the bearing seat and is used for pressing a bearing outer ring in the bearing seat; and the adjusting gasket is detachably clamped between the end face of the bearing seat and the first gland and is pressed and fixed through the first gland, and the thickness of the adjusting gasket is configured to be used for adjusting the pre-stretching amount of the lead screw. Compared with a lead screw pre-stretching mechanism in the related technology, the lead screw pre-stretching mechanism has the advantages of being controllable in pre-stretching amount, high in structural rigidity, convenient and fast to install and maintain and the like.

The invention discloses a powder injection molding method for improving the performance of maraging steel. The powder injection molding method comprises the following steps that maraging steel powder and a binder are kneaded to prepare feed; the prepared feed is subjected to crushing and granulation; carrying out injection molding on the crushed and granulated feed to obtain a green body; performing catalytic degreasing on the prepared green body; sequentially performing negative pressure degreasing, vacuum internal sintering and sintering on the sample subjected to catalytic degreasing to obtain a sintered part; the obtained sintered part is subjected to solid solution and quenching treatment, and a solid solution part of a full-martensite structure is obtained; the obtained solid solution part is subjected to pre-stretching treatment; and aging treatment is conducted on the pre-stretched sample, and the maraging steel is obtained. According to the present invention, the material is subjected to proper pre-stretching so as to introduce the high-density and uniform dislocation to improve the precipitation of the strengthening phase, such that the comprehensive performance of the material is improved, and the density of the dislocation introduced through the pre-stretching is high so as to appropriately reduce the addition of the noble metals such as Co, Mo and the like so as to easily reduce the cost;

This invention relates to a method for controlling springback during aluminum profile bending and to an aluminum profile itself. The method includes the following steps: obtaining the target bending parameters and mold dimensions of the aluminum profile; applying a pre-stretch of 0%-5% deformation to the aluminum profile before bending; determining the number of forming passes based on the yield strength after pre-stretching and the target bending center angle; progressively determining the forming angle for each pass based on the number of forming passes and the target bending center angle; maintaining a constant outer arc length of the aluminum profile in each bending pass, and bending the aluminum profile according to the number of forming passes and the forming angle for each pass. This invention, by applying a certain amount of pre-stretching deformation to the aluminum profile before bending and using multiple progressive forming processes to correct springback, can effectively improve the accuracy of the target radius of curvature and bending center angle of the aluminum profile, reduce the impact of springback, and achieve high-precision control of bending, making it suitable for industrial production.

The utility model relates to an intelligent stretching device for wind power variable pitch bearing, contain X axis linear module, stretching module and pre -stretching module, X axis linear module is double slide platform linear module, and two slide platforms symmetrically set up on linear module, and simultaneously approach or far away under linear module drive, stretching module and pre -stretching module set up on two slide platforms respectively, all include the Z axis linear module of vertical placement, stretching module still include intelligent stretcher, the visual positioning module for identifying bolt position on variable pitch bearing, pre -stretching module still include nut tightener, the utility model not only can realize automatic stretching and lock through stretching module, reduce the labor intensity, improve work efficiency, and still increase to have pre -stretching module, can ensure the nut on variable pitch bearing to be in the tightening state before stretching lock, avoid the failure of pull rod and bolt alignment because of the nut loosening, and the automation degree is high.

Various implementations include an expandable sheath system (300) including a radially expandable sheath (208) with a restraining member (385) that limits the expansion of the sheath, and a method for manufacturing the same.

The application discloses a process method for increasing residual compressive stress of aluminum alloy rods and application, and comprises the following steps: quenching and drawing after solid solution treatment of the aluminum alloy rods; and the cumulative deformation of the drawing is not higher than 15%. The application provides a process method for increasing residual compressive stress of aluminum alloy rods, and pre-stretching is performed on an aluminum alloy extrusion blank by using a drawing process, so that the internal stress state of the aluminum alloy extrusion blank changes and is redistributed. Small deformation drawing is selected, plastic deformation of the drawing only occurs on the surface of the rod, shrinkage of the surface layer of the rod is limited by the inside, and thus the surface layer of the rod is in residual compressive stress in the axial direction.

The invention discloses an in-situ pre-deformation high-temperature fatigue testing method for powder high-temperature alloy, and belongs to the field of metal material performance testing. The in-situ pre-deformation high-temperature fatigue test method for the powder high-temperature alloy comprises the following steps: placing a sample on a scanning electron microscope sample table for pre-stretching treatment, and photographing the sample in the pre-stretching process to obtain a pre-deformation curve of the sample changing along with time; carrying out processing treatment on the pre-stretched sample; and after the processing treatment is completed, carrying out fatigue load loading treatment on the sample, and photographing the sample in the loading treatment process. In the invention, in-situ fatigue and in-situ prestretching control are integrated in a scanning electron microscope system, which is simple, convenient and efficient, and reliable in control; compared with a DIC test deformation control method of a digital image correlation method, the SEM video extensometer deformation control method is more efficient, simpler and more convenient, does not need a related high-speed camera and the like, is higher in accuracy, and controls the error within 0.05%.

The invention relates to the technical field of metal material service safety evaluation, in particular to a method for evaluating the service safety of a Super304H steel pipe with abnormally coarse grains, which comprises the following steps: firstly, accurately simulating the structure evolution behavior of the Super304H steel pipe in the long-term service process of a coarse grain area through a solid solution and high-temperature aging coupling treatment method of a pre-stretching sample; a P function value in each aging state is calculated through a Parson-Miller parametric method, namely a P function, then a hardness value in each aging state is calculated, data fitting is carried out on hardness value descending section data and the P function value, and a correlation model between the hardness parameter and the coarse grain region structure aging degree (P function) is constructed. A service remaining service life evaluation model is established by combining the condition that the hardness of the Super304H steel is at a lower limit value (150HV), accurate evaluation of the service safety of the outer-wall coarse-grain Super304H steel pipe is realized, technical support is provided for scientific operation management and safety evaluation of an ultra-supercritical unit, and the method is expected to play a key role in the field of operation and maintenance of the ultra-supercritical unit and has a wide application prospect. And efficient and safe development of the power industry is facilitated.

The application relates to the extrusion molding technical field of high-strength aluminum alloy profiles, in particular to an extrusion molding equipment and method for high-strength aluminum alloy profiles, which comprises an extrusion molding die, a conveying assembly used for conveying the extruded high-strength aluminum alloy profiles, a cutting knife arranged at one end of the conveying assembly and a moving table installed outside the cutting knife, one side of the moving table is provided with a traction assembly, one side of the traction assembly is fixedly connected with a moving rod, the moving rod moves synchronously with the traction assembly, and a fixed square rod is fixedly installed on the moving table; the application realizes stable traction of the aluminum alloy profiles after extrusion molding, and realizes synchronous force supporting of the two ends of the profile during traction, realizes the pre-stretching function of the high-strength aluminum alloy profile during traction, further ensures that the profile can bear force uniformly during traction, and further ensures the production quality of the high-strength aluminum alloy profile.