56 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 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 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 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 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.

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 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.

The invention relates to the technical field of aluminum alloy plate production, and provides a rolled aluminum alloy plate aging treatment method which comprises the following steps: carrying out pre-stretching treatment on a rolled aluminum alloy plate; the value of the pre-stretching deformation is substituted into a dislocation formula, and the dislocation density is determined; the dislocation density is substituted into a parameter formula, and the heat preservation temperature and the heat preservation time of first-stage aging are determined; and primary aging treatment and secondary aging treatment are conducted on the plate. Therefore, the dislocation density of the test sample is analyzed and detected through X-rays, and the function relation of the dislocation density, the pre-stretching deformation amount and the first-level aging parameter is constructed. Primary aging parameters can be accurately set according to the pre-stretching deformation amount, so that the plate presents slight overaging in the length direction and slight insufficient aging in the width direction, the strengthening effects in the two directions are equivalent, and the distribution uniformity of precipitated phases in the length and width directions of the plate in the subsequent aging process is ensured; the anisotropy of the mechanical property of the plate is reduced.

The invention discloses a machining method and a mold structure for a flame tube cap cover with an inwards-turned special-shaped hole, and belongs to the technical field of metal plate forming. The method comprises the steps of laser blanking, pre-stretching, heat treatment, hydroforming and machining. Wherein the pre-stretching process and the liquid-filling forming process are continuously completed on the same set of composite die, specifically, the main body molded surface of the part is firstly stretched and formed, then high-pressure liquid is injected into a closed cavity, the special-shaped convex hull with the space angle is formed at a time through liquid pressure, and the main body molded surface is synchronously corrected. The die integrates stretching and liquid filling functions, a convex structure corresponding to the special-shaped convex hull and a hydraulic runner are arranged on the molded surface of a concave die of the die, and a convex die is provided with a groove matched with the convex die and an elastic blank holder assembly. The functions of multiple sets of traditional dies are integrated, the tool cost is remarkably reduced, meanwhile, the forming precision and the wall thickness uniformity of the complex special-shaped inward flanging hole are guaranteed through hydroforming, and parts are stable in quality and good in consistency.

The application relates to the technical field of automobile part manufacturing, and discloses a forming method of an automobile connecting plate and the automobile connecting plate. The automobile connecting plate comprises a bending part and a flange. The forming method of the automobile connecting plate comprises the following steps: S1, a pre-stretching process, a blank is stretched into a pre-stretching piece by using a pre-stretching die. The pre-stretching piece comprises a pre-stretching bending part and a pre-stretching flange; S2, a secondary stretching process, the pre-stretching piece is stretched into a secondary stretching piece by using a secondary stretching die. The secondary stretching piece comprises a secondary stretching bending part and a secondary stretching flange; and S3, edge cutting, the secondary stretching end pressing area in the secondary stretching piece is cut off. The forming method of the automobile connecting plate and the automobile connecting plate can improve the forming process flow of the automobile connecting plate, solve the round corner cracking problem of the connecting plate, and reduce the rebound and wrinkle conditions of the connecting plate.

The invention discloses a longitudinal spiral HFCVD diamond deposition system and a deposition method.The deposition system comprises a plurality of spiral lamp filaments located on the side of a base body, the spiral lamp filaments are arranged in the vertical direction and distributed at equal intervals in the transverse direction, the two ends of each spiral lamp filament are connected with a pre-stretching structure, and the two ends of each spiral lamp filament are connected with the corresponding pre-stretching structure; one side of the spiral filament away from the substrate is connected with the supporting structure; the pre-stretching structure comprises a plurality of molybdenum elastic pieces distributed at equal intervals in the transverse direction, one end of each molybdenum elastic piece is connected with the end of the spiral lamp filament, the other end of each molybdenum elastic piece is installed on the insulating piece through a fixing screw, and gaps with adjustable sizes are formed between the molybdenum elastic pieces and the insulating piece. The supporting structure comprises a plurality of supporting molybdenum sheets which are distributed at equal intervals in the vertical direction. According to the longitudinal spiral type HFCVD diamond deposition system and method, the deposition performance is remarkably improved through a longitudinal spiral type filament structure, the system reliability and the process stability are enhanced, and large-area uniform deposition can be achieved.

This invention discloses a high-strength, high-toughness, creep-resistant, and corrosion-resistant zinc alloy with a multi-level gradient heterogeneous structure, its preparation method, and its applications, belonging to the field of zinc alloy material processing technology. The alloy's microstructure exhibits a three-layer gradient distribution from the inside out: the central main mechanical load-bearing region is composed of substructure grains, serving as a rigid framework to resist deformation; the intermediate grain boundary pinning and blocking regions are distributed with high-density necklace-like MnZn... 13 The second phase is used to lock grain boundary slip in situ and shield longitudinal pitting corrosion; the outer uniform corrosion-inducing zone is composed of recrystallized grains, used to induce uniform surface degradation. This invention utilizes a "die-bulk" gradient temperature control and unsteady-state variable-speed extrusion process, combined with pre-stretching aging treatment, to achieve an ultra-high tensile strength of 472.5-485.0 MPa while reducing the steady-state creep rate of the alloy to 6.0 × 10⁻⁶. ‑10 -9.0×10 ‑10 s ‑1 The scope was expanded, and the potential for localized pitting and perforation was eliminated.

The invention relates to a friction stir welding residual stress regulation and control method, a special clamp and welding equipment. Annular pre-stretching stress and constraint pressure of a specific angle are synchronously applied to an annular workpiece before welding, and directional pressure conduction is achieved through a set included angle between an abutting face of an axis positioning rotary disc and a welding plane; the nugget area is in a bidirectional controlled stress field in the welding process; when constraint after welding is relieved, release of pre-stretching stress directly counteracts welding residual tensile stress, so that residual compressive stress is regulated and controlled, compared with a traditional thermal tension technology, the method does not need an external heat source, the temperature control problem of a high-thermal-conductivity material is thoroughly avoided, meanwhile, the positioning precision problem of stress regulation and control of the annular piece is solved through mechanical angle constraint, and the method is suitable for large-scale popularization and application. And the fatigue life of key force-bearing components such as the hub is greatly prolonged.

The utility model discloses a harmonic reducer flexible gear pre-forming machining transfer die which comprises a first die body, a second die body, a third die body, a fourth die body, a fifth die body, a sixth die body, a seventh die body and an eighth die body which are used for machining material pieces in sequence. The second die assembly and the third die assembly are used for shaping the outline of the boss, the fourth die assembly is used for punching a center hole in the boss, the fifth die assembly is used for stretching the boss with the center hole into a cylinder, the sixth die assembly is used for compressing the R angle of the connecting position of the cylinder and a flange, and the seventh die assembly is used for punching a flange hole in a material sheet. And the eighth die is closed to punch the flange on the material sheet so as to realize blanking, and the flange hole is formed in the flange. According to the scheme, material deformation is effectively controlled, stress concentration is reduced, and geometric accuracy and structural stability of the cylinder and the flange are ensured through the progressive machining process of seven sets of dies and the synergistic effect of staged and multi-procedure.

The invention discloses a large-deformation low-speed pre-stretching driving aluminum alloy heat treatment process, and belongs to the field of metal heat treatment. The method sequentially comprises the steps of solution treatment, large-deformation slow pre-stretching driving treatment, low-temperature regression treatment and low-temperature aging treatment. The method is characterized in that large-deformation (8%-20%) pre-stretching driving treatment is introduced before low-temperature regression treatment, and through low-speed stretching (preferably 0.1-1mm / min) of less than or equal to 1mm / min, dual effects are synchronously realized: (1) high-density dislocation is introduced as a nucleation point for uniformly dispersing and separating out a beta'phase in subsequent low-temperature aging; and (2) residual stress is generated, diffusion activation energy of solute atoms is reduced, and the solute atoms in the regression stage are driven to be re-dissolved back to a matrix from a beta ''phase. And finally, the precipitated phase structure is synergistically optimized, and the corrosion resistance is remarkably improved while the mechanical property is kept. Compared with a T6 heat treatment process, the heat treatment process provided by the invention has the advantage that the corrosion resistance can be effectively improved on the premise that the mechanical property is not lost. And compared with a regression reaging process, the process flow is greatly shortened, the production efficiency is improved, and the cost is saved.