28 results about "Pre stretching" patented technology

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.

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 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 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 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 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 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.

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.

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 discloses a preparation method for improving the mechanical property of a 7-series aluminum alloy thick plate, and relates to the technical field of aluminum alloy deformation machining. The technical problems that in the prior art, a rolling system is unreasonable, the accumulated plastic deformation degree and the tissue breaking degree of the plate core are insufficient, and the mechanical property of the plate is difficult to effectively improve are solved. The method comprises the steps of smelting and casting; carrying out homogenizing heat treatment and surface milling; hot rolling; and carrying out solid solution, pre-stretching and aging treatment to obtain a finished plate. A large rolling reduction rolling method is adopted, so that residual phases in the soaking process are effectively crushed and uniformly distributed, redissolution is more sufficient in the solid solution heat treatment process, and the number and density of precipitation strengthening phases in the aging heat treatment process are increased. The method is used for improving the mechanical property of the 7-series aluminum alloy thick plate.

The invention relates to a variable stiffness composite material, in particular to a shape memory alloy-based composite material and a preparation method and application thereof, and the preparation method comprises the following steps: removing an oxide layer on the surface of a nickel-titanium alloy, and performing thermal cycle training on the nickel-titanium alloy for several times to stabilize the phase change behavior of the nickel-titanium alloy, so that the phase change strain of the nickel-titanium alloy after thermal cycle training reaches 4%; and applying a pre-stretching load to the pretreated nickel-titanium alloy to introduce martensite de-twin strain, maintaining a stretching state, immersing the nickel-titanium alloy into PDMS, and curing to obtain the NiTi / PDMS composite material. Compared with the prior art, the problems that in the prior art, compounding between the shape memory alloy and the flexible substrate is prone to debonding, bubbles are prone to remaining, and accurate regulation and control cannot be achieved are solved. According to the scheme, the mechanical property defect caused by the process defect of the composite material is overcome by optimizing the composite process, the rigidity can be adjusted within the three-time range, and the multi-scene dynamic rigidity requirement can be met.

This invention discloses a method for preparing a high-conductivity brazable magnesium alloy sheet. The magnesium alloy composition, by mass percentage, is: Zn 5.5~6.0%, Mn 0.5~1.0%, Cu 0.3~0.7%, Sn 0.1~1.0%, with the remainder being Mg and unavoidable impurities. The method includes the following steps: (1) preparing magnesium alloy ingots by semi-continuous casting; (2) first extrusion forming into round bars; (3) upsetting treatment; (4) two-stage solution treatment; (5) multi-directional forging treatment; (6) second extrusion forming into plates; (7) pre-stretching and straightening treatment; (8) high-temperature short-time annealing; (9) hot rolling treatment; (10) two-stage aging treatment; (11) cold rolling treatment; (12) edge trimming treatment to obtain the finished high-conductivity brazable magnesium alloy sheet. The magnesium alloy sheet prepared by this invention has excellent mechanical properties, stable high conductivity, and reliable brazability.

The invention provides a preparation method of a 7-series aluminum alloy with ultrahigh strength and low residual stress. The preparation method comprises the following steps: (1) preparing the following raw materials in percentage by mass: 7.0 to 8.5 percent of Zn, 2.0 to 2.8 percent of Mg, 1.8 to 2.5 percent of Cu, 0.10 to 0.18 percent of Zr, 0.05 to 0.15 percent of Sc, 0.02 to 0.08 percent of Ti, 0.2 to 0.35 percent of Ag, less than or equal to 0.10 percent of Fe, less than or equal to 0.08 percent of Si and the balance of Al and inevitable impurities; (2) smelting the prepared alloy raw materials in a resistance furnace; adding a refining agent after the alloy is melted, standing after refining, and casting after standing to obtain an aluminum alloy cast ingot; (3) carrying out two-stage homogenization heat treatment on the cast ingot, and air-cooling to room temperature after homogenization; (4) extruding the cast ingot; (5) carrying out gradient heating on the cast ingot; (6) carrying out partition temperature control on the extrusion die; (7) online two-stage quenching is adopted; and (8) pre-stretching deformation is conducted, and then two-stage aging is adopted. According to the method, the strength of an aluminum alloy product is greatly improved, large residual stress cannot be generated, the size of the product is also remarkably improved, and therefore the production efficiency, the yield and the quality are improved.

A pre-stretching screw rod relates to the technical field of screw rod pre-stretching, which comprises a ball screw rod, a fixed end assembly rotatably connected to the fixed end, a pre-stretching end assembly rotatably connected to the pre-stretching end, a bearing seat, a bearing installed in the bearing seat, a bearing sleeve sleeved on the pre-stretching end to lock the ball screw rod in the bearing seat, a rear spacer ring installed in the bearing seat, the rear spacer ring sleeved on the pre-stretching end to press the bearing to lock the bearing in the bearing seat, the rear spacer ring pressing the bearing to lock the position, a first locking nut sleeved on the outer end of the pre-stretching end, the first locking nut being in threaded connection with the pre-stretching end, an adjusting nut installed in the bearing seat and sleeved on the rear spacer ring, the adjusting nut being clamped between the first locking nut and the bearing, one end of the adjusting nut pressing the bearing, the other end of the adjusting nut pressing the first locking nut, the adjusting nut providing dynamic pre-tightening force adjustment, the first locking nut and a second locking nut being fixed through threaded locking, and the pre-tightening force being ensured to be stable for a long time.

The invention provides a stress release regulation and control method in the aluminum plate stretching process, and belongs to the technical field of aluminum plate production. Whether a partition stretching mode is started or not is judged according to a stress gradient coefficient, an aluminum plate is divided into independent stretching areas in the width direction, and differential initial stretching force is distributed for pre-stretching; when the residual stress release effect is insufficient, the material structure is stabilized through aging treatment, then the tensile force of each area is adjusted according to updated stress field data to conduct longitudinal stretching and transverse stretching, and in the stretching process, a temperature rise prediction control algorithm is adopted to dynamically adjust the cooling power to maintain the temperature field stable; surface layer and deep layer stress detection data are integrated to obtain a complete three-dimensional stress field, and it is judged that stress release regulation is completed. The technical problem that in the aluminum plate stretching process, due to uneven initial stress distribution, stress field redistribution after stretching is unbalanced, and high-precision stress uniformity regulation is difficult to achieve is solved.

The present application relates to a kind of inhibiting aluminum profile bending springback method and aluminum profile.The present application aluminum profile bending forming springback control method includes the following steps: according to the mechanical properties of the profile to be bent, pre-aging is carried out to aluminum profile before bending forming;According to the hardness of the profile after pre-aging, pre-stretching is carried out to aluminum profile;Bending forming is carried out to aluminum profile after pre-aging and pre-stretching.The material characteristics of aluminum alloy is different from steel material, and the springback amount after bending forming unloading is much larger than steel material, so the bending springback law of steel material is not applicable to aluminum alloy.The present application can effectively reduce the influence of springback by suitable pre-aging and pre-stretching to aluminum profile before bending forming, realize the high-precision control of bending forming, and is suitable for industrial production.

This invention discloses a self-anchoring and self-compensating reinforcement device and method for multi-layer composite SMA; the device includes at least two sets of transition steel plates, multi-layer composite SMA plates, and connecting components; the transition steel plates are located on both sides of the potential propagation path of cracks in the steel structure; the multi-layer composite SMA plates include a self-locking and self-compensating SMA plate, a reinforcing SMA plate, and an installation component; the self-locking and self-compensating SMA plate needs to undergo pre-stretching and preheating excitation shaping treatment before assembly, and it has pre-stored shape memory recovery deformation capability; one end of the self-locking and self-compensating SMA plate is fixed to the reinforcing SMA plate, and the other end is fixed to the transition steel plate; the reinforcing SMA plate is then subjected to thermal excitation after assembly to generate active prestress for closing cracks in the crack tip region of the steel structure; when the reinforcing SMA plate experiences prestress loss during long-term service, the self-locking and self-compensating SMA plate compensates for the axial deformation loss of the reinforcing SMA plate, achieving prestress self-compensation without secondary thermal excitation.

The application provides a low-alloyed high-aging-response electric arc additive magnesium alloy and a preparation method thereof, and belongs to the field of metal electric arc additive manufacturing; according to mass percentage, the magnesium alloy composition comprises 0.2-0.6wt.% of Gd, 0.35-0.75wt.% of Zn, 0.15-0.35wt.% of Zr, 0.03-0.12wt.% of Ca, 0.05-0.18wt.% of Sm, and the rest is magnesium and inevitable impurities, and the content of the inevitable impurities is less than or equal to 0.05wt.%; the preparation method of the magnesium alloy comprises layer-by-layer deposition, pre-stretching and aging treatment; the layer-by-layer deposition treatment comprises that the vertical distance between the magnesium alloy welding wire and the magnesium alloy substrate is 5-12mm, the welding current is 85-150A, the welding voltage is 15V-25V, the wire feeding speed is 12m / min-20m / min, and the welding gun advancing speed is 15mm / s-25mm / s; the low-alloyed magnesium alloy (the total content of alloying elements is less than or equal to 1.8wt.%) is composed of equiaxed crystals and precipitated phases uniformly dispersed in the grains, the average grain size is less than or equal to 45μm, the size of the precipitated phases is less than or equal to 50nm, the texture intensity is less than or equal to 2.6mrd, the alloy yield strength is greater than or equal to 150MPa, and the alloy can meet the demand of high-end equipment manufacturing.

The invention provides a preparation method of an aluminum alloy pre-stretched thick plate. The preparation method comprises the following steps that a 7-series aluminum alloy cast ingot is sequentially subjected to hot rolling, solution treatment, stretching treatment and aging treatment; the temperature of the hot rolling is 420-470 DEG C, and the maximum pass rolling reduction of the hot rolling is 40 mm. The 7XXXT7451 pre-stretched thick plate with high strength and toughness is prepared by adopting a high-temperature large rolling reduction and two-stage aging process, the high-temperature large rolling reduction means that a cast ingot is heated to the high temperature of 420-470 DEG C before hot rolling so as to ensure smooth hot rolling, a plurality of rolling modes with the maximum rolling reduction pass of 40 mm are adopted in the hot rolling process, and the thickness of the hot rolled thick plate is larger than that of the cast ingot. And a certain recrystallization structure is obtained, so that the mechanical property, fracture toughness and other properties of the pre-stretched thick plate are improved.

The invention discloses a hollow aluminum profile roll bending forming control method. The method comprises the steps that the target bending radius of a profile is determined; according to the target bending radius, 0-2% pre-stretching is conducted on the profile in the length direction; pre-bending the profile in the height direction; and the profile is reversely bent, and the bending rolling reduction is the sum of the rolling reduction needed by the target bending radius and the pre-bending rolling reduction. According to the method, a small amount of extra residual stress is introduced through pre-stretching and pre-bending, elastic stress release after section bar bending is effectively counteracted, section bar bending springback is remarkably reduced, the bending forming precision and control of the hollow aluminum section bar are improved, and the method is simple, easy to implement and suitable for industrial production.