123results about How to "Reduce work hardening" patented technology

A method for producing reinforced titanium alloy wire, comprising forming a billet of titanium alloy with grains of a precipitated discontinuous reinforcement material such as TiB and / or TiC. The billet may be formed by the hot consolidation of a titanium alloy powder formed by gas atomization. The billet is then hot formed to reduce it to rod or coil form. The rod or coil is then subjected to successive cold drawing operations to form a reinforced titanium alloy wire of reduced diameter. The cold drawing includes periodic annealing operations under low oxygen conditions to relieve work hardening and to recrystallize the reinforcement material grains to reduce the size thereof.

The invention relates to a silver alloy wire and a preparation method thereof. The silver alloy wire is prepared from the following components of 0.5-10 percent of Au, 0-1 percent of Pt, 1-6 percent of Pd, 0-1 percent of Rh, 0-1 percent of Cu, 0-500ppm of Ln, 0-200ppm of Ce, 0-0.5 percent of Al, 0.7-3 percent of Ti, 0-0.2 percent of Si, 0-0.3 percent of Zn, 0-1 percent of Sn, 0-10 percent of Be and the balance of Ag. A directional continuous casting process is adopted. The prepared silver alloy wire overcomes the problem that the bonded silver wire is easily subjected to sulfur corrosion in the prior art, and has a series of other excellent characteristics.

The invention discloses a drawing and forming method for a deep cylindrical piece and a mould thereof. The mould comprises a concave mould, a convex mould corresponding to the concave mould, and a side pressing ring which is arranged on the convex mould in a sleeving mode, wherein drawing threshold structures which are mutually corresponding and matched are arranged on the bottom surface of the concave mould and the surface of the side pressing ring corresponding to the bottom surface; during first-pass drawing, a product does not form a flange, so that a mouth part of a component can be effectively prevented from wrinkling during second-pass drawing. During reverse drawing, the drawing threshold structures can reduce wrinkling and burning defects, and effectively reduce side-pressing force at the same time. According to the drawing and forming method for the deep cylinderical piece and the mould thereof, during reverse drawing, a flow direction of a metal material is reverse to that of the metal material in a front drawing process, thereby facilitating mutually balancing out residual stress of drawing and forming; and a drawing coefficient of reverse drawing is smaller than that of front drawing, thereby facilitating reducing drawing times and improving forming quality.

The invention relates to a cylindrical accessory machining method and system for a metal mold. The method comprises the steps that firstly, surface induction quenching pretreatment is carried out on a blank of a roughly-machined cylindrical accessory, and a hardening layer is formed on the surface of the blank; secondly, the pulse current is exerted on the blank, pulse current tempering treatment is carried out on the hardening layer on the surface of the blank, and meanwhile turning machining is carried out to form a semi-finished accessory; and thirdly, the semi-finished accessory rotates, the pulse current is further exerted on the semi-finished product, electroplastic treatment is carried out on the surface layer of the semi-finished accessory, and ultrasonic peening rolling is carried out on the surface of the semi-finished product through an ultrasonic rolling device. The system is formed through refitting on a lathe and is suitable for machining guide columns and various metal rotation body accessories through the method. Compared with a traditional technology, according to the method, the overall mechanical performance, the surface quality and the surface smoothness of the surface layers of the guide columns can be obviously improved, the production procedure is greatly simplified, the production efficiency is improved, and the production cost is reduced.

The invention relates to a high manganese hot-dip galvanized steel sheet containing rare earth and a manufacture method thereof. The high manganese hot-dip galvanized steel sheet comprises the following chemical components by chemical component: 0.4-0.8% of C, 14-20% of Mn, 0.05-0.15% of RE, less than or equal to 0.020% of P, less than or equal to 0.012% of S, 1.0-2.0% of Al, 0.01-0.03% of N, and the balance of Fe and unavoidable impurity, and Mn+20*C are greater than or equal to 30%, and Al+5*Re are greater than or equal to 1.8%. The method employs a cold rolling-continuous annealing for pickling-galvanizing technology, the steel plate yield strength is 450-650 MPa, the tensile strength is 980-1100 MPa, the elongation percentage is more than 50%, structure under room temperature is 100% of austenite, the recrystallization fraction is 80-95%, the delayed cracking performance is good, and the steel sheet has superhigh strength and high mouldability. The steel sheet is especially suitable for vehicle structural members and safety members with high shaping performance and corrosion resistance as well as complex shapes, such as side door beam, bumpers, floor tunnels, various beams and b columns.

The invention discloses a non-annealed cold forging steel hot-rolled wire rod and a production method thereof. The method comprises the steps of continuous casting, heating, rolling, spinning and cooling. The non-annealed cold forging steel hot-rolled wire rod comprises 0.29-0.38wt% of C, 0.15-0.30wt% of Si, 0.70-0.90wt% of Mn, 0.03wt% or less of P, 0.03wt% or less of S, 0.30wt% or less of Cr, 0.0008-0.0050wt% of B, and the balance of Fe and residual elements. In the heating step, continuous cast billets are heated to 1100-1190DEG C; in the rolling step, the initial finish rolling temperature is 965-995DEG C; in the spinning step, the spinning temperature is 960-990DEG C; and in the cooling step, the cooling speed is 0.5-1.5DEG C / s. The method realizes production of the non-annealed cold forging steel hot-rolled wire rod through optimally designing chemical components, controlling the heating temperature, the initial finish rolling temperature, the spinning temperature and the cooling speed and controlling the amount and the grain size of ferrite by using present devices and technologies without increasing investment or production cost, so the non-annealing production and cost reduction demands of downstream users are met, and pollution of annealing to environment is avoided.

The invention discloses a method of reducing residual stress and quenching deformation non-uniformity of an aluminum alloy after deformation. The key of the invention is as follows: a reasonable deformation, annealing, warm rolling, solution hardening and prescription system is adopted, and the method is suitable for a wrought aluminum alloy board. The method comprises the following steps of: rolling the aluminum alloy board, annealing at 300-350 DEG C, thermally insulating for 0.5-4 hours, carrying out warm rolling and leveling at rolling reduction of 3-5%, carrying out board solution after leveling and water-quenching, pre-deforming for 0-8% after quenching and ageing, and further eliminating quenching residual stress. By adopting the invention, the quenching residual stress of the aluminum alloy board is reduced through a reasonable warm-rolling and leveling process, quenching deformation non-uniformity of the alloy is improved, in comparison with the regular rolling, solution and ageing method, the residual stress is at least reduced by 30%, the room-temperature tensile strength is at least improved by 8%, and the process method has the advantages of simple operation, capability of saving the cost, and wide industrial application prospect.

The invention relates to a laser helper roll bending formation device and a method thereof, belonging to the roll bending formation technology and equipment field. The laser helper roll bending formation device comprises a roll bending formation machine, a computer control system and a laser system; by adopting the device, in the roll bending formation process, laser is used as heat source to carry out local radiation heating to a part of a board, which is hard to form, so as to improve the formation performance and leading the formation process to be convenient; meanwhile, part of the board can be directly formed by laser and cut. The device has the advantages that: the problems of processing hardening of the board in the roll bending formation process and multi-pass formation are effectively solved, meanwhile, resilience of the board is reduced, the working efficiency is improved and the production period of products is greatly shortened.

The invention discloses a heat-assisted variable-section roll forming machine system and a method thereof. According to the system, a variable-section roll forming system comprises an uncoiler, a straightening machine, a feeding machine, a variable-section roll forming unit and a flying shear machine sequentially according to the machining sequence of plates, an electromagnetic auxiliary heating system comprises a high-frequency furnace and a temperature sensor, a computer control system comprises a variable-section roll forming control system and the electromagnetic auxiliary heating system, the uncoiler, the straightening machine, the feeding machine, the variable-section roll forming unit and the flying shear machine are connected with the variable-section roll forming control system, the high-frequency furnace and the temperature sensor are connected with the electromagnetic auxiliary heating system, and the variable-section roll forming control system is in communication connection with the electromagnetic auxiliary heating system. By the aid of the system and the method, the work hardening phenomena of plates made of magnesium alloys, aluminum alloys and high-strength steels can be reduced, the forming limit of plates can be improved, the deformation resistance can be reduced, the uniformity, the toughness and the malleability of material flowing can be improved, and the forming performance of plates can be improved.

The invention relates to a controlling method for lowering the yield ratio of low-carbon cold heading steel, and belongs to the technical field of steel rolling. The controlling method is used for controlling the yield ratio of low-carbon cold heading steel hot-rolled wire rods. The temperature for finish rolling is controlled, and in the rolling and deformation process, solid solution N in the steel is controlled to be separated out in the austenitic area in the form of large-size AlN. Meanwhile, coarse austenite grains caused by over-high rolling temperature or mixed crystal caused by rolling in part of recrystallization zones due to over-low finish rolling temperature is avoided, and a large-area coarse grained Widmanstatten structure is generated after rolling. The temperature for wire forming is controlled to be 860DEG C-900DEG C, and a heat holding cover is opened. According to roller speed control of a Stelmor air-cooled line, the cover feeding temperature is controlled to be 700DEG C-750DEG C, and the cover discharging temperature is controlled to be 550DEG C-600DEG C, wherein the average cooling rate in the cover is controlled to range from 0.4DEG C / s to 0.6DEG C / s, and retarded cooling time is 260s-420s. The solid solution N in the steel is separated out in the form of AlN with a small size of 20nm-60nm in a ferrite area. The controlling method has the advantages that the yield ratio of the hot-rolled wire rods is effectively controlled, the probability of work hardening of deep drawing of the hot-rolled wire rods is remarkably lowered, the wire breakage rate and the loss of a grinding tool are lowered, and the service life of the wiredrawing grinding tool is greatly prolonged.

The invention discloses a low-alloy martensite steel high-toughness treatment method and martensite steel. The low-alloy martensite steel high-toughness treatment method comprises the following steps:(1) pretreatment, wherein a uniform single-phase austenite structure is obtained; (S2) high-temperature forging, wherein a forging ratio is 50-80%, a final forging temperature is higher than a martensite transformation temperature by 50-100 DEG C, and the austenite structure is cooled to the room temperature to obtain a structure taking martensite as the principal thing; (S3) medium-temperature forging, wherein heat is preserved at a temperature higher than the martensite transformation temperature by 30-70 DEG C, air cooling is performed, forging begins while the temperature is cooled to a temperature lower than an eutectoid transformation temperature by 30-100 DEG C, the forging ratio is 70-90%, the final forging temperature is lower than the eutectoid transformation temperature by 150-250 DEG C, forging total time is within 2 minutes, quenching cooling is performed until the room temperature, and the structure taking the uniform fine batten as the principal thing is obtained; and (S4), low-temperature tempering. According to the method disclosed by the invention, high-temperature forging and medium-temperature forging are combined, so that original austenite grains can be remarkably refined, and therefore, plasticity and toughness are remarkably improved while strength of the martensite steel is increased.

The invention discloses an ultrasonic vibration pneumatic drill based on rotary type wireless electric power transmission. The ultrasonic vibration pneumatic drill comprises a rotary wireless electric power transmission assembly, an ultrasonic transduction assembly, an amplitude-change pole, a spring chuck assembly and a connecting assembly, wherein the rotary wireless electric power transmission assembly is used for realizing electric power transmission between two mechanisms rotating oppositely and comprises a wireless electric power transmission primary unit and a wireless electric power transmission secondary unit; the ultrasonic transduction assembly is used for converting ultrasonic-frequency electric signals into ultrasonic-frequency mechanical vibration; the ultrasonic vibration amplitude-change pole is used for amplifying small-amplitude mechanical vibration into large-amplitude mechanical vibration to meet requirements of ultrasonic vibration drilling machining; the spring chuck assembly is used for clamping tools; the connecting assembly is used for connecting ultrasonic vibration drilling parts with the rear end of the pneumatic drill so as to realize power transfer and electric power transmission. Ultrasonic vibration is applied to the traditional drilling machining process, and a combined machining mode of coupling of ultrasonic vibration and traditional drilling motion is formed, so that machining quality is effectively improved and machining efficiency is improved.

The invention discloses a rare earth-contained high-manganese cold-rolled steel plate and a manufacturing method thereof. The steel plate comprises the following components in percentage by weight: 0.4-0.8% of C,14-20% of Mn, 0.05-0.15% of RE, P not more than 0.020%, S not more than 0.012%, 1.0-2.0% of Al, 0.01-0.03% of N, and the balance of Fe and inevitable impurities; and the steel plate satisfies the conditions that: Mn+20*C not less than 30% and Al+5*RE not less than 1.8%. The steel plate is produced by a cold rolling-continuous annealing process to obtain austenite with 100% of room-temperature microstructure, reaches the recrystallization fraction of 80-95%, the yield strength of 450-650 MPa, the tensile strength of 950-1100 MPa and the ductility of above 50%, is excellent in splitting delay performance, is ultrahigh in strength, and is suitable for a vehicle structural part and a safety part with complex shapes.

The invention discloses low-modulus medical titanium alloy comprising Nb with the molar concentration of 10-25%, Cr with the molar concentration of 1-8%, Sn with the molar concentration of 0-2% and the balance Ti. The invention further provides a preparation method of the low-modulus medical titanium alloy. The method includes the steps that under the argon protection atmosphere condition, a cast ingot is subjected to homogenizing annealing; solution treatment is conducted under the vacuum condition, and then the cast ingot is placed in water for quenching; cold machining forming is conducted at room temperature; a sample obtained after cold machining forming is re-crystallized and annealed under the vacuum condition, wherein re-crystallization and annealing temperature is 700-900 DEG C, time lasts for 0.5-2 h and a cooling mode is water quenching or ice water quenching; the low-modulus medical titanium alloy is obtained. The titanium alloy has good cold machining performance, and is high in strength, low in Young modulus, good in corrosion resistance and biocompatibility and suitable for the medical fields like bone implantation.

The invention relates to a nonmagnetic steel product and a manufacturing method thereof. The manufacturing method of the nonmagnetic steel product comprises the following steps: preparation of a green body: taking Fe-Mn prealloy powder, adding 2-4% of an activating agent and 0.3-0.6% of graphite, then adding a binder of which the weight is 0.5-1.2% of the total weight of the Fe-Mn prealloy powder, the activating agent and the graphite, and carrying out compression moulding after mixing to obtain the green body, wherein the activating agent comprises FeB master alloyed powder, and the weight percentage of B powder is 15-25%; and sintering: sintering the green body to obtain the nonmagnetic product. Use of raw materials with high price such as copper powder is avoided, the manufacturing cost of the nonmagnetic steel product is low, meanwhile, the nonmagnetic steel product with excellent performance is obtained, the tensile strength can reach 500 MP or above, and the elongation reaches up to 6% or above.

The invention discloses a method for producing an Nb3Al superconducting wire precursor through elastic plastic processing. The method for producing the Nb3Al superconducting wire precursor through the elastic plastic processing comprises assembling an aluminum bar, a niobium tube and a copper tube to obtain a copper, niobium and aluminum composited bar; performing electric plastic drawing machining on the copper, niobium and aluminum composited bar through an electric plastic drawing device to obtain a subgroup element; performing drawing machining through the electric plastic drawing device again after the subgroup element is assembled and squeezed to finally obtain a multi-core Nb3Al superconducting wire precursor. The method for producing the Nb3Al superconducting wire precursor through the elastic plastic processing has the advantages of slowing down processing hardening, greatly improving the material plastic deformation capability, solving the problem that a wire breaks down during drawing due to the facts that the niobium and the aluminum are large in melting point difference and accordingly effective stress relief annealing cannot be performed, meanwhile shortening the production period and reducing production costs due to the fact that high-energy electric pulses are introduced during wire machining.

The invention discloses a silvery bright steel wire acid-washing-free and drawing treatment process. The silvery bright steel wire acid-washing-free and drawing treatment process comprises the following steps: (1) mechanically shelling: enabling a wire material to pass through a plurality of rolling wheels which mutually form angles by a mechanical rust-removing device; (2) brushing, sweeping and polishing: increasing a belt sander after the wire material is mechanically shelled and before the wire material enters a mould box, and brushing, sweeping and polishing residual oxide on the surface of the wire material as required; and (3) drawing: adopts a rolling and drawing mould and a pressure mould to cooperate with each other. Through mutual cooperation of the rolling wheels and the belt sander, the rust-removing effect of the wire material is obviously improved and the produced finished product achieves the effect that the surface is silvery bright; meanwhile, the existing acid-washing surface treatment process is replaced, so the production efficiency is improved; and a drawing process which combines the rolling and drawing mould with the pressure mould is adopted, so in the wire material drawn by the process, the processing hardening degree is low, the oxide skin residual ratio is low, the surface flatness is high, the surface lubricating film coverage rate is high, one thin layer of film covers the surface of the wire material, and the subsequent re-processing and cleaning effects are good.

The invention relates to a roll centre heating type roll bending forming method of a metal plate strip, which belongs to the field of roll bending forming technologies and equipment and is used for solving the problem of difficult forming of sheet metals, such as magnesium alloy, aluminum alloy, high tension steel, and the like due to work hardening. The roll centre heating type roll bending forming method is characterized by comprising the following steps of: heating a working roll in a protective atmosphere; carrying out roll bending forming on the sheet metal by the hot working roll after the working roll is heated to required temperature; transferring heat to the sheet metal from the working roll; heating the sheet metal; cooling the sheet metal subjected to the roll bending forming; and cutting according to a set length. Furthermore, the invention also provides a roll centre heating type roll bending forming device according to the method. The device comprises a roll bending forming machine, a computer system, a heating system, a cooling system and a gas protective cover. Compared with the traditional roll bending forming device, the invention has the advantages of less forming times and high surface quality of a product; and the sheet metal which is difficultly formed is processed more easily.

The invention relates to a heat treatment technology for 8021 high-performance aluminum foil for a soft package. Two times of intermediate annealing and final finished product annealing are conducted in a cold rolling stage in an existing 8021 aluminum foil production technology. By means of the heat treatment technology, on the basis of a traditional preparing technology, a '2+1' annealing manner is used for improving the performance of the 8021 aluminum foil for the soft package of a lithium battery; precipitation, growth and distribution of second phases are effectively controlled, so that multiple second phases and fine grain structures are obtained and are well matched in the aspects of strength and plasticity (the tensile strength ranges from 101 MPa to 110 MPa, and the elongation percentage ranges from 16% to 23%); and in addition, the cupping value is larger than or equal to 6.5 mm, and the requirement for the use performance of the soft package of the lithium ion battery can be met. The technology is simple in operation, relatively low in production cost and capable of improving alloy structures and obviously increasing the alloy elongation percentage and the cupping value; and meanwhile the produced aluminum foil has extremely-high isolation performance. The aluminum foil can be compounded with other materials, simultaneous stretching and flowing can be achieved, and in addition, the requirement for the scouring depth of composite film soft packages of food, medicines and even lithium ion batteries can be met.

The invention provides a preparation method of a sintered iron powder base soft magnetic composite, and belongs to the technical field of soft magnetic composites. The technological process includes the steps that initially, pretreatment is conducted on water atomized iron powder by means of high-temperature steam treatment, then cementation treatment is conducted by means of a double tapered spraying blender, a binder solution is atomized and evenly sprayed on materials continuously tumbling under the effect of a high-pressure gas, ultrathin pure silica powder and ultrathin iron-phosphorus alloy powder evenly adhere to the surfaces of iron powder particles, and sintered iron base powder is obtained. High-density compact is prepared by high-speed compacting through a warm mold with the mold wall lubricated, then fast sintering densification at low temperature is conducted, and finally an iron-silicon-phosphorus soft magnetic composite is obtained. The sintered iron powder base soft magnetic composite has the advantages of high magnetic permeability, low eddy-current loss and high strength, and is suitable for high-frequency application.

The invention discloses a corrosion-resistant high-strength support / hanger assembly. The support / hanger assembly comprises a tube clamp and a connecting part arranged at the lower end part of the tube clamp, wherein the tube clamp comprises two clamp pliers which are in the same shape and are symmetrically arranged; each clamp plier comprises a connecting end, a circular arc section and a clamping section; the connecting ends of the two clamping pliers are connected together in a rotating manner; the arc mouth ends of the circular arc sections of the two clap pliers are oppositely arranged; fastening holes are respectively formed in the clamping sections of the two clamp pliers, and the two fastening holes correspond to each other. The invention further discloses a manufacturing technology of the corrosion-resistant high-strength support / hanger assembly. The support / hanger assembly disclosed by the invention is simple and reasonable in tube clamp structure, scientific in design, high in strength, hardness and toughness, resistant to acid and alkaline corrosion, not liable to deform under high temperature and high pressure, and long in service life.

The invention relates to a heating roll-bending shaping method of a metal sheet, belonging to the roll-bending shaping technique and equipment field, which solves the problem of difficulty in shaping a magnesium alloy, an aluminum alloy and high-strength steel owing to work hardening. The heating roll-bending shaping method is characterized by comprising the following steps: heating the metal sheet in protective atmosphere until the sheet reaches a set temperature, carrying out roll-bending shaping on the sheet, and then cooling the shaped sheet; and finally cutting the cooled metal sheet and packing. The invention further provides a heating roll-bending shaping device for the metal sheet according to the method, which comprises a roll-bending shaping system, a computer control system, a heating system, a cooling system and a gas protection cover. By adopting the device, the metal sheet which is difficult to be shaped can be heated and then subject to roll-bending shaping, cooled and then cut into proper length. Compared with the traditional roll-bending shaping method and the device, the shaping method and the device of the invention have the advantages of less shaping passes, high economic benefit and being capable of more easily machining the metal sheet which is difficult to be shaped owing to work hardening.

Provided is an axial ultrasonic vibration drilling device fixed by a lathe carriage. The axial ultrasonic vibration drilling device fixed by the lathe carriage comprises a drill, an amplitude-change pole, a transducer, a beam hanging type fixed device and an ultrasonic generator electrically connected to the transducer. The beam hanging type fixed device comprises a hanging beam fixed on the lathe carriage and a front pressing plate and a rear pressing plate, wherein the front pressing plate and the rear pressing plate are fixedly connected to the hanging beam, the front pressing plate fixes the front end of the amplitude-change pole, the rear pressing plate fixes the transducer, a fixed pressing plate fixes the middle part of the amplitude-change pole, and the front pressing plate, the rear pressing plate and the fixed pressing plate are all divided into upper and lower two parts and are assembled through bolts. Compared with a drilling device achieved on a drilling machine, there is no need to conduct any special refit on a machine tool; in addition, a method of workpiece revolution is adopted, there is no need to use assembly units such as a ring manifold or a carbon brush, thus the structure is simplified, the cost is saved, and the axial ultrasonic vibration drilling device fixed by the lathe carriage is convenient to disassemble and assemble and is beneficial to a proceeding of ultrasonic vibration drilling.

The invention discloses 430 ferritic stainless steel for kitchen ware panels and a preparation method thereof. The 430 ferritic stainless steel comprises the following components in percentage by mass: 0.030-0.05% of C, 0.02-0.05% of N, 0.20-0.40% of Si, less than or equal to 0.20% of Ni, less than or equal to 0.35% of Mn, 16.00-16.50% of Cr, less than or equal to 0.035% of P, less than or equal to 0.010% of S, and the balance of Fe and inevitable impurity elements. The equivalent value of nickel is not greater than 2.00, and the equivalent value of chromium is not less than 16.50. During preparation, a hot-rolled black skin roll is subjected to cover annealing, acid pickling, cold rolling, cold annealing and acid pickling, leveling and other procedures to be prepared into a finished product with the required target thickness. The formula and the preparation process of the 430 ferritic stainless steel are scientific and reasonable, and the prepared stainless steel has higher ferritic stability and lower hardness and yield strength, so that the material is more suitable for stamping, can meet the requirement of cost control in the kitchen ware industry, and is suitable for production and processing of high-end kitchen ware.

The invention discloses a manufacturing method of a metal plate. A plate is obtained by spinning to mold a cylinder, splitting and flattening along the bus direction of the cylinder. One-pass or multi-pass spinning process is adopted; when multi-pass spinning is carried out, in order to recover the plasticity of materials to facilitate continuous spinning, thermal treatment is adopted during two passes so as to improve the material plasticity and reduce processing hardening; when final-passing spinning is carried out, in order to control the wall thickness of the spinning cylinder to be within the qualified range, a test spinning method is adopted, so that a plate meeting the requirement can be met. Because materials are subjected to plastic deformation, the mechanical performance is improved, so that performance of the plate subjected to flattening is superior to the performance of a cylinder blank before spinning. The manufacturing method of the metal plate is suitable for manufacturing plates with high precision and special wall-thickness specification, and can be used for manufacturing metal plates with different specifications flexibly.

The invention discloses an additive manufacturing metal surface strengthening method based on laser shock peening. The additive manufacturing metal surface strengthening method aims to solve the problems of energy utilization, the lap joint effect, the influence depth of residual compressive stress and the like which commonly exist in the laser shock peening process. The additive manufacturing metal surface strengthening method comprises the steps that firstly, the metal surface manufactured through additive manufacturing is pretreated, and then laser shock peening machining is conducted; simulation treatment and analysis are conducted on the laser shock peening process, the optimal distribution proportion and the light spot lap joint rate of a pulse 1 and a pulse 2 are determined, and the proper mounting positions of a focusing lens and a reflector 2 are adjusted correspondingly; and then a high-energy pulse 1 conducts point-by-point machining strengthening on a to-be-strengthened area, meanwhile, a low-energy pulse 2 conducts pre-machining on a next point-by-point machining area, then a metal target moves by one station, and laser shock peening is conducted again till strengthening machining is completed. According to the additive manufacturing metal surface strengthening method, under the condition that parameters of a laser device are not changed, laser pulse energy is fully utilized, and the laser shock peening effect is comprehensively improved.

The invention relates to the technical field of aluminum alloys, in particular to a heat treatment method for synchronously improving strength and ductility of a 7-series aluminum alloy plate. According to the heat treatment method, a 7-series aluminum alloy hot-rolled plate is adopted as a treated object, solution treatment, pre-aging treatment, retrogression heating treatment and re-aging treatment are adopted in sequence, and a product is obtained. When the design process is applied to an aluminum alloy 7050 plate, the strength of extension of the obtained product ranges from 565 MPa to 590MPa, the yield strength of the obtained product ranges from 520 MPa to 560 MPa, and the ductility of the obtained product ranges from 20% to 23.5%. The strength and ductility of an alloy can be improved at the same time. In addition, the continuous temperature increase and heating manner is adopted, a large amount of time can be saved in the retrogression heating treatment stage, and the production efficiency is improved.

The invention relates to a preparation method of a NbTi / CuNi superconducting switch wire with high Ni content. The preparation method specifically comprises the following steps: S1, machining a CuNi tube blank and an ingot blank into a NbTi / CuNi primary sheath and a NbTi / CuNi secondary sheath; S2, subjecting the NbTi / CuNi primary sheath and a NbTi rod to primary assembling to a prepare a NbTi / CuNi primary composite ingot blank; S3, subjecting a NbTi / CuNi primary bar billet to scaling through a high-hardness tungsten carbide scaling mold; S4, carrying out secondary assembling on the NbTi / CuNi secondary sheath and a NbTi / CuNi primary composite rod obtained in the step S3, and filling a gap with a CuNi rod; S5, subjecting a NbTi / CuNi secondary bar billet to scaling through the high-hardness tungsten carbide scaling mold; and S6, subjecting the NbTi / CuNi secondary composite rod to cold drawing so as to finally obtain the NbTi / CuNi superconducting switch wire. According to the method, the problem of strain hardening of the wire in a cold drawing process is weakened, and the wire is not broken in the whole drawing process.

The invention discloses a gas shielded flux-cored welding wire for vertical mill grinding roller bead welding composite manufacture and a preparation method thereof. The welding wire is composed of aferrite stainless steel band and powder wrapped in the ferrite stainless steel band, wherein the powder accounts for 25-28% of the total weight of the welding wire. The powder comprises, by weight, 60.0-65.0% of high carbon ferro-chrome, 12.0-15.0% of chromium carbide, 5.8-6.0% of graphite, 1.0-2.0% of metal manganese powder, 4.0-4.5% of carbonizing silica powder, 1.0-2.0% of aluminum magnesium alloy, 0.2-0.5% of zircon sand, 0.5-1.5 of cryolite, 0.5-1.5% of sodium fluoride, 0.5-1.5% of lithium carbonate, and the balance iron powder. The preparation method comprises the following steps of manufacturing the ferrite stainless steel band with the thickness of 0.4 mm and the width of 10 mm into a U shape; adding the powder into the U-shaped groove; after the U-shaped groove heals up, conducting six times of continuous drawing reducing in sequence; finally conducting mechanical cleaning on the surface of the welding wire; and obtaining the phi 1.2mm gas shielded flux-cored welding wire forgrinding roller bead welding composite manufacture. The vertical mill grinding roller bead welding composite manufacture can be achieved by adopting the welding wire, the welding processing performance of the welding wire is excellent, little welding smoke is produced, the operation is flexible, and a bead welding layer is high in abrasive resistance.

The invention relates to a device and a method for the cold bending production of reduce section channel steel for a vehicle longitudinal beam, which overcome the shortages that the prior die has poor universality, short service life, complex forming process and low production precision, and the surface quality and the mechanical property of a product after stamping cannot be guaranteed, and the like. The invention has the following measures: the device for producing the reduce section channel steel for the vehicle longitudinal beam mainly comprises a cold bending rolling mill 1, a cutter 2, a welding machine 3 and a conveying roller bed 4, and is characterized in that an extruder 5 is arranged between the cutter 2 and the welding machine 3; and the production method comprises the following steps: using the cutter 2 to perform cutting, adopting the extruder 5 to deform the reduce section segment of the channel steel and reserve a welding seam, adopting the welding machine 3 to perform welding, and cutting to length. The device and the method have the advantages of low manufacturing cost, high productivity, no need of a special die, high dimension precision, relative stamping, energy conservation, environmental protection with less pollution, small work hardening, and better product comprehensive mechanical properties.