119results about How to "Eliminate work hardening" patented technology

A cold rolling method for preparing high-Si steel sheet containing Fe (85-96 Wt%) and Si (4-15) includes such steps as providing raw material containing Si, B and Fe, smelting, casting, forging, hot rolling, warm rolling, heat treating and cold rolling.

The invention relates to a thin-walled closure head high accuracy spinning forming method. The invention is to resolve the problem of big size closure head, thin wall thickness, high accuracy size and high difficulty of forming. Spinning machine is started to make rolling wheel do axial and circumferential movement along track loaded into program in head while spinning, meanwhile main axle of spinning machine drives core and bar plate to spin. When rolling wheel rolls to the distance of 20mm from edge it quits. The invention has the advantages of simple process and high accurate product.

The invention relates to a method for preparing an aluminum foil for a lithium battery and belongs to the technical field of machining of aluminum alloy materials. The method for preparing the aluminum foil for the lithium battery includes the steps of performing smelting and cast rolling processes: heating and smelting raw materials of the aluminum foil for the lithium battery to form an aluminum alloy melt, sequentially carrying out refining slagging-off, grain refining, degassing deslagging and filtration treatment and subjecting the filtered aluminum alloy melt to continuous cast rolling to form a blank; performing a cold rolling process: subjecting the blank to cold rolling firstly and then to primary annealing treatment, rough rolling and secondary annealing treatment; performing foil pressing treatment: carrying out finish rolling on the annealed aluminum foil, and finally slitting the foil to obtain the aluminum foil finished product for a lithium battery finished product. According to the method for preparing the aluminum foil for the lithium battery, composition segregation in the process of alloy cast rolling is improved through added uniform annealing treatment; an original cast rolling structure is improved so that the product with uniform constituents and structure and stable performances can be obtained; moreover, the performances of the aluminum foil for the lithium battery can be improved.

The invention relates to a method for manufacturing a copper-aluminum composite tube, and belongs to the technical field of manufacturing a metal composite tube. The method is characterized by comprising the following steps: A, preparing an inner tube and a covering belt, B. performing surface cleaning on the inner tube and the covering belt, C. covering the covering belt after surface cleaning on the surface of the inner tube after surface cleaning, performing vertical covering welding to manufacture a copper-aluminum composite tube blank, D. performing linear drawing on the copper-aluminum composite tube blank without strain furling, E. final annealing, and F. winding and furling to manufacture a finished product and other processing steps. The method can be used for manufacturing a copper-clad aluminum tube, an aluminum-clad copper tube and the copper-aluminum composite tube of which an inner layer and an outer layer are copper and the middle part is aluminum; and firm metallurgical bonding can be achieved between the copper and the aluminum.

The invention relates to a medical high-nitrogen nickel-free austenitic stainless steel material and a production method thereof. The material is a single-phase austenite structure and comprises the following components by weight percent: 15-18% of Cr, 10-16% of Mn, 1.5-2.5% of Mo, 0.4-0.7% of N, 0.02-0.08% of RE, less than or equal to 0.06% of unavoidable impurities and the balance of Fe. The material is free of toxic nickel, has good cytotoxicity and pyrogenic testing performances, excellent mechanical performance, higher abrasion resistance and good corrosion resistance, especially spot corrosion resistance and intergranular corrosion resistance.

The invention provides a preparation method of a fine grain copper alloy shaped charge liner. The preparation method of the fine grain copper alloy shaped charge liner comprises the following steps: carrying out compound cold extrusion plastic deformation, carrying out deep overcooling treatment, and carrying out recrystalization annealing, wherein the compound cold extrusion plastic deformation comprises the steps of putting a blank into a mould cavity of a preformed blank forming mould, carrying out forward extrusion forming to obtain a designed copper alloy preformed blank under the actions of three-dimensional compressive stress and deformation rate and then putting the preformed blank into a mould cavity of a shaped charge liner forming mould and gradually forming the shaped charge liner preformed blank by carrying out gradual-pass diameter-expanded extrusion plastic deformation, thus obtaining the shaped charge liner blank of a required shape structure; the deep overcooling treatment comprises the step of carrying out heat preservation on the shaped charged liner blank for 2-4 hours at the temperature ranging from -196 DEG C to 130 DEG C; and the recrystallization annealing comprises the step of carrying out heat preservation on the shaped charge liner (subjected to deep overcooling treatment) for 5-15 minutes at the temperature of 450-550 DEG C in a protective atmosphere, thus obtaining a shaped charge liner component. The preparation method of the fine grain copper alloy shaped charge liner has the advantages that strict requirements of the shaped charge liner on grain structure homogeneity, consistency of performance and stress state and distribution can be met, and quality of the shaped charge liner can be improved.

The invention discloses a method for preparing a molybdenum-rhenium alloy foil, and particularly relates to a technology for preparing the foil with thickness less than 0.1mm. The method comprises the following steps of preparing molybdenum-rhenium alloy powder; mould-pressing the molybdenum-rhenium alloy powder so as to obtain a pressed shape; sintering the pressed shape so as to obtain a sintered base; sequentially carrying out hot rolling, warm rolling and cold rolling on the sintered base so as to obtain the molybdenum-rhenium alloy foil with required thickness. The method is applicable to industrial mass production, has high production efficiency, and can also be used for preparing different thicknesses of molybdenum-rhenium sheets according to market requirement.

The invention relates to a production technology of a copper-clad steel wire in a soft state. The production technology successively comprises the following steps: drawing; tempering under high temperature; carrying out electro-deposition pretreatment; carrying out acid electrolysis; washing; carrying out pretreatment of electro-deposition; washing; carrying out electrodeposition thick treatment; washing; carrying out anti-oxidation processing; drying; drawing; washing; carrying out anti-oxidation processing; tempering under high temperature; polishing; carrying out anti-oxidation processing; and spooling to obtain a finished product. An advantage of the production technology of the copper-clad steel wire in the soft state is that an elongation rate of the produced copper-clad steel wire is greater than or equal to 8%, wherein the elongation rate, which is compared with an elongation rate of a copper-clad steel wire produced by a traditional tempering technology, can be enhanced by at least more than one time..

The method discloses a forging forming method of a low-pressure turbine shaft made of C250 maraging steel, which is provided for obtaining a forging with a better structure and a better property. The method comprises processing steps as follows: a C250 maraging steel bar material which is subjected to blanking according to specification is heated to a forging temperature ranging from 990 DEG C to 1,040 DEG C, heated to the forming temperature again after upset and stretched, and prepared into a pre-forged blank in a forging die; the pre-forged blank is forged into a low-pressure turbine shaft forging at a strain rate of 0.015s<-1>-0.0015s<-1> in the forging die after heated to a forging temperature ranging from 1,020 DEG C to 1,060 DEG C; and the low-pressure turbine shaft forging is subjected to solid solution and aging heat treatment after forged, the solid solution is that the low-pressure turbine shaft forging is heated to 825 DEG C and is subjected to air cooling after heat insulation, and the aging is that the low-pressure turbine shaft forging is heated to 485 DEG C and is subjected to air cooling after heat insulation. The forging is mainly used for being prepared into a low-pressure turbine shaft part of an aero-engine.

The invention discloses a method for preparing metal thin-wall microtubes. The method includes the steps of material pretreatment, blank manufacture and female die stretching. Tube blanks are fixed in a female die, the tube walls are extruded by a die core which moves on the inner sides of the tube blanks, so that the purpose of reducing the thickness of the tube walls is reduced. The wall thickness of the tube blanks can be continuously thinned by replacing the die core, and then the metal tubes with the thin walls are prepared. The method of severe plastic deformation is adopted to treat materials, so that ultra-fine grained microscopic structures are acquired, and then the deformability of the materials is improved. On the basis, a novel female die stretching technology is adopted, namely the tube blanks are placed in the female die, the overall dimension of the tube blanks is limited, and the die core moves inside the tube blanks, so that the wall thickness of the tube blanks is reduced and generally reaches the needed dimension, then tube stocks are straightened, polished, and eventually finished products are acquired. The method for preparing the metal thin-wall microtubes has the advantages of being high in machining accuracy and yield.

The invention discloses a copper belt production technology for a new energy automobile connector, and belongs to the technical field of the copper plate belt production technology. The technology comprises the first step of cast ingot smelting, the second step of face milling, the third step of hot rolling, the fourth step of rough rolling, the fifth step of one-time annealing, the sixth step of one-time cleaning, the seventh step of intermediate rolling, the eighth step of two-time annealing, the ninth step of two-time cleaning, the tenth step of intermediate rolling, the eleventh step of three-time annealing, the twelfth step of three-time cleaning, the thirteenth step of finish rolling, the fourteenth step of four-time cleaning and the fifteenth step of leveling, wherein in the fourth step of rough rolling, after rough rolling, the regulated thickness of a belt roll is 2.5 mm. By means of the technical scheme, the copper belt annealing technology quality and the copper belt surface quality can be improved, and therefore the workshop cost can be reduced, and the productive profit can be increased.

The invention belongs to the technical field of aluminum alloy plate strip foil machining, and particularly relates to a manufacturing method for producing an aluminum alloy plate for high-strength thinning and drawing by adopting a cast-rolled blank. The manufacturing method of the aluminum alloy plate for high-strength thinning and drawing comprises the following specific steps of preparing an aluminum alloy with an industrial aluminum ingot, a Fe agent, a Si agent, a copper agent, a magnesium ingot and the like as raw materials, the aluminum alloy is subjected to smelting, refining and standing, and titanium wires are added, and then the aluminum alloy is subjected to cast rolling after online slag removal and degassing and is machined into a cast-rolled plate blank roll; and homogenizing annealing is carried out during cold rolling machining of the plate blank roll, annealing is carried out in a nitrogen annealing furnace, then intermediate annealing is carried out on the rolled material, and finally a finished product with the thickness of 0.5 mm is obtained through cold rolling. According to the manufacturing method of the aluminum alloy plate for high-strength thinning and drawing, the manufactured aluminum alloy plate is high in tensile strength, low in lug-making rate and controllable in surface roughness, good deep punching and thinning performance is met, and meanwhile, the utilization rate of the material is improved; and compared with existing common hot-rolled plates, the plate produced though the cast-rolled blank is capable of reducing the cost by about 20%and has a wide application prospect.

The invention discloses a small-size LED copper strip production process, and belongs to the technical field of the copper strip production process. The production process includes the following stepsof (1) smelting and ingot casting, (2) hot rolling, (3) milling, (4) rough rolling, (5) first annealing, (6) one-step cleaning, (7) intermediate rolling, (8) secondary annealing, (9) secondary cleaning, (10) intermediate finish rolling, (11) third annealing, (12) third cleaning, (13) finish rolling, (14) unwinding, (15) fourth annealing, (16) fourth cleaning, (17) refine rolling, (18) fifth cleaning, (19) flattening and (20) cutting and delivery. According to the technical scheme, the quality of small-size LED copper strips can be improved, the workshop cost is reduced, and the production profits are increased.

The invention discloses a method for producing an aluminum alloy plate. The method comprises the following steps of: preparing materials: uniformly mixing 0.4% of Si, 0.6% of Fe, 4% of Cu, 0.1% of Mn, 0.22% of Cr, 0.06% of Ti, 2% of Mg, 0.2% of Zn and the balance of Al; processing the prepared materials into a cast alloy ingot; heating and hot-rolling the cast alloy ingot to obtain a blank; cold-rolling the blank; carrying out intermediate annealing; cold-rolling; carrying out intermediate annealing; drawing and straightening; cold-rolling; thermally treating; and straightening and sharing to obtain the aluminum alloy plate with the preset thickness. According to the invention, a cold-rolling process is carried out in two steps, the intermediate annealing is carried out after the cold-rolling so as to eliminate work hardening and recover metal plasticity, and finally, the thermal treatment is carried out to increase the performance of the aluminum alloy plate to meet a requirement so as to obtain the qualified aluminum alloy plate, so that the finished product rate of the aluminum alloy plate is increased.

The invention discloses a method for manufacturing a high-silicon steel sheet containing novel composite inhibitors, and belongs to the field of metal materials. High-silicon steel comprises (by wt%) from 4.5 to 7.0 of Si, from 0.05 to 0.9 of Nb, from 0.05 to 0.3 of B, from 0.01 to 0.05 of Mn, from 0.010 to 0.020 of S, from 0.010 to 0.020 of P, from 0.020 to 0.040 of C, from 0.003 to 0.020 of Al and the balance Fe and inevitable impurities. The method mainly includes adding proper quantities of Nb and B elements to be used as the composite inhibitors for thinning as-cast grains in a vacuum melting stage; then forging to form a sheet blank; carrying out hot rolling for the sheet blank until the thickness of the sheet blank ranges from 1.0mm to 4.0mm; carrying out diffusion annealing for the sheet blank; then carrying out warm-rolling for the sheet blank for 5 to 30 minutes to obtain a sheet with the thickness ranging from 0.2mm to 0.8mm; carrying out heat treatment for the sheet at the temperature ranging from 500 DEG C to 800 DEG C; and carrying out cold rolling to obtain the high-silicon steel sheet with the thickness ranging from 0.05mm to 0.6mm. The Nb and B elements are added to form the inhibitors capable of obviously suppressing the grains from growing in various stages, so that room-temperature brittleness of the high-silicon steel sheet is improved, and cold rolling yield of the high-silicon steel sheet is increased. In addition, productivity is increased on the basis of improving plasticity of materials by the quick heat treatment after the warm-rolling, and the high-silicon steel sheet is finally manufactured by the cold rolling. Besides, the manufactured cold-rolled sheet is excellent in surface quality and good in shape.

The invention relates to a low-temperature heating oriented electrical steel with good surface coating and a production method thereof, belonging to the technical field of oriented electrical steels. A casting blank comprises the following components: 0.005-0.08wt% of C, 2.5-6.5wt% of Si, 0.005-0.03wt% of Als, 0.001-0.4wt% of Mn, 0.01-0.3wt% of Cu, 0.003-0.010wt% of N, 0.001-0.03wt% of S, 0.01-0.3wt% of Sn, 0.001-0.1wt% of Cr, less than or equal to 0.02wt% of P and the balance of Fe and inevitable impurities. The casting blank is heated to 1150-1300 DEG C and then is subjected to hot rolling, a hot rolled plate is subjected to acid pickling, two-step cold rolling containing intermediate annealing is carried out until the thickness of a finished product is achieved, the intermediate annealing is carried out at the temperature of 750-850 DEG C, the heat preservation is carried out 3-6 minutes, and the furnace atmosphere is mixed gas of wet H2 and N2. The invention has the advantages that an auxiliary inhibitor is added, the intermediate annealing process is improved, and the short-time low temperature recovery annealing is carried out after cold rolling, thus the intermediate full-decarbonizing annealing time is reduced, the production efficiency is improved, and the quality of the surface coating is improved.

The invention discloses a production technology of a copper strip for an automobile contact and belongs to the technical field of copper plate and strip production technologies. The production technology comprises 1, ingot melting casting, 2, surface milling, 3, hot rolling, 4, rough rolling, 5, primary annealing, 6, primary washing, 7, medium rolling, 8, secondary annealing, 9, secondary cleaning, 10, medium finish rolling, 11, tertiary annealing, 12, tertiary washing, 13, finish rolling, 14, quaternary washing and 15, leveling. The production technology improves annealing process quality and copper strip surface quality, reduces a workshop cost and improves productive profits.

The invention relates to nanostructure based high-energy-absorption and high-manganese type TWIP steel and a preparation method of the nanostructure based high-energy-absorption and high-manganese type TWIP steel, and belongs to the field of metal materials. The nanostructure comprises nano-scale tissues and nano-sized precipitates, wherein the nano tissues can improve the strength of the materials and can also improve the plasticity of the materials, and the reinforcement of the materials is dominated by the nano precipitates. According to the nanostructure-based high-energy-absorption and high-manganese type TWIP steel and the preparation method of the nanostructure based high-energy-absorption and high-manganese type TWIP steel, on the basis of the addition of V element, Ni and Ti microalloy elements are further added, the TWIP steel which is of the nanostructure and the high energy absorption capability is obtained after the working procedures of smelting, casting, forging, homogenizing in a heating furnace, hot rolling, acid pickling, two-stage cold rolling and annealing. After the high-manganese TWIP steel is subjected to a one-way tensile test with the speed rate being 1 mm/min at the room temperature, the yield strength of the high-manganese TWIP steel is 650-820 MPa, the anti-extension strength of the high-manganese TWIP steel is 1080-1180 MPa, the cracked extension rate is 30% or above, the energy absorbed in the process of extension and deformation is 35 GPa% or above; and the nanostructure based high-energy-absorption and high-manganese type TWIP steel is excellent in chemical property, and the preparation method of the nanostructure based high-energy-absorption and high-manganese type TWIP steel is simple and feasible.

The invention relates to a copper-nickel alloy tube preparation method, which comprises the following steps: placing a BFe10-1-1 cupronickel material in a casting apparatus to carry out smelting and casting to obtain an ingot; placing the ingot in an extruder to carry out extrusion to obtain a tube billet; placing the tube billet into a tube rolling machine to carry out rolling to obtain a roll-type tube billet; placing the roll-type tube billet into a disk drawing machine to carry out disk drawing to obtain a roll-type finished product; placing the roll-type finished product in a bright annealing furnace to carry out annealing to obtain a bright finished product; and placing the bright finished product into a coil straightening machine unit to carry out straightening, straight placing and sawing cutting to obtain the ultra-long qualified finished product. The semi-hard state BFe10-1-1 copper-nickel alloy straight tube produced by the method of the present invention has characteristics of excellent plasticity and high tube end expansion processing property, high size deviation precision, thin wall thickness, long length, saved intermediate softening degradation time, and high yield, wherein production efficiency of the method of the present invention is 3 times production efficiency of the traditional straight drawing production method.

The invention discloses a double strong copper strip production technology for an automobile connector, and belongs to the technical field of a copper strip production technology. The double strong copper strip production technology comprises the following steps of (1), smelting and ingot casting; (2), hot rolling; (3), milling; (4), rough rolling; (5), once annealing; (6), once cleaning; (7), medium rolling; (8),twice annealing and cleaning; (9), finish rolling; (10), three times annealing and cleaning; (11), finish rolling; (12), four times cleaning; (13), leveling; and (14), examining and delivering; and specified thickness of strip coil after rough rolling is 2.5 mm. According to the technical scheme, brass products can meet the double requirements of tensile strength and elongation index of automobile connector industry.