239results about How to "Improve plasticity" patented technology

The invention discloses a low cost yield strength 700MPA level non-tempering processing high strength steel plate, which is characterized by, in terms of mass, comprising 0.05-0.10% of C, 0.1-0.4% of Si, 1.5-2.0% of Mn, less than 0.015% of P, less than 0.01% of S, 0.3-0.8% of Cr, 0.09-0.15% of Ti, 0.04-0.08% of Nb, less than 0.005% of N, less than 0.002% of O, and balance of Fe and unavoidable impurities. The manufacturing method of the steel plate comprises technological steps of smelting, rough rolling, fine rolling, reeling and cooling to obtain the steel plate with yield strength of 700-780MPa, tensile strength of 800-860MPa and elongation Delta larger than or equal to 18%. The yield strength 700MPA level non-tempering processing high strength steel plate simultaneously has abrasive resistance and better low temperature toughness, toughness and crispiness transition temperature is at around negative 40 DEG C, specific energy of shock at normal temperature can reach as high as 120J.

The invention discloses an aluminum alloy used for preparing a high-strength high-plasticity aluminum matrix composite material and the aluminum matrix composite material, and belongs to the field of metal matrix composite materials and aluminum alloys. The aluminum alloy comprises chemical components including, by weight percent, 0.3%-0.7% of Si, 0.7%-1.4% of Mg, 0.6%-1.2% of Cu and the balance Al. Ceramic particles such as SiC, Al2O3, B4C, TiC and TiB2 and nanocarbon such as carbon nano tubes and graphene are added into the aluminum alloy to serve as a wild phase, the yield strength of the prepared composite material is obviously improved, and the composite material can reach the level of 2000 series aluminum alloy matrix composite material with the same wild phase content. Meanwhile, the aluminum matrix composite material has the good plasticity, and cold deformation machining can be carried out without cracking. Meanwhile, the natural aging negative effect (parking effect) of the prepared composite material is weak, and the strength of the composite material obtained through manual aging after natural aging can reach the strength value obtained through direct manual aging after quenching.

The invention discloses a method for manufacturing large cake forgings of high-carbon and high-chromium cold working die steel. The method is characterized by comprising the following steps of: obtaining Cr12MoV or Cr12Mo1V1 steel by adopting primary smelting with an electric furnace, ladle refining and vacuum degassing process smelting; pouring the tapped steel to form a 6 to 9t octangular ingot; conveying the octangular ingot to a press at the temperature of more than or equal to 300 DEG C, forging the octangular ingot to a blank with the diameter of 300 to 700 millimeters, removing surface defects by annealing, polishing or turning and local grinding, performing cold saw cutting on the end face and blanking to form a cake blank; and heating the cake blank to the temperature of between 1,150 and 1,190 DEG C, upsetting and forging the cake blank by using the press, annealing and turning, and thus obtaining the large cake forgings of the high-carbon and high-chromium cold working die steel. By adopting the method, the yield is improved to 40 to 60 percent; and the manufactured large cake forgings of the high-carbon and high-chromium cold working die steel can comprehensively meet the requirements of hardness, impact toughness and the like and ultrasonic flaw detection quality.

The invention provides high-strength-and-toughness aluminum alloy. The aluminum alloy is manufactured by adopting a semi-solid die casting technology, and comprises, by mass, 6.5-9.5% of Si, 0.25-0.65% of Mg, 0.15-0.25% of Cu, 0.06-0.09% of Ti, 0.1-0.15% of V, 0.05-0.1% of Sb, 0.05-0.1% of Yb, less than or equal to 0.2% of Fe and the balance Al and other impurity elements. The high-strength-and-toughness aluminum alloy has high strength, good plasticity and excellent semi-solid die-casting process performance. The invention further provides a manufacturing method of the high-strength-and-toughness aluminum alloy.

The invention relates to a restrained induction heating electromagnetic riveting device, comprising a restrained induction heater for quickly heating a rivet head to be formed, wherein the restrained induction heater comprises an induction heating coil connected with a high-frequency current generating power supply, and a plurality of ferrites for restraining a magnetic field are annularly arranged on the induction heating coil; the restrained induction heater also comprises a silicon steel sheet arranged on the outer sides of the induction heating coil and the ferrites for shielding the leaked magnetic field, the restrained induction heater sleeves the tail end of the amplifier of an electromagnetic riveter and is fixedly connected with the shell of the electromagnetic riveter by a support frame, the amplifier moves with respect to the restrained induction heater to form a heated rivet head to be formed; the invention also relates to restrained induction heating electromagnetic riveting method. According to the restrained induction heating electromagnetic riveting device, the rivet is quickly heated by the restrained magnetic field, and meanwhile a composite board is not damaged; the restrained induction heater is reasonably combined with the electromagnetic riveter, so that the restrained induction heating electromagnetic riveting device is high in forming efficiency, simple in technology and applicable to the structure with poor openness.

The invention relates to a manufacturing method of a stainless steel wire. The manufacturing method comprises the following steps: 1, peeling a surface layer with the depth of 0.1-0.15mm from the stainless steel wire by using a rotary cutting or scraping method, manufacturing the peeled stainless steel wire into a wire of 5.5-10mm; 2, annealing the wire at a temperature of 800-900 DEG C; 3, carrying out coating treatment on the surface of the wire of 5.5-10mm by adopting a coating agent, then drying in a drying furnace at a furnace temperature of 100-150 DEG C for 0.5-1.0h; 4, drawing on a multi-head continuous drawing machine, wherein a large reduction rate of 25-30 percent is adopted in the first head, then the reduction rate is successively reduced, the wire is taken up after being coarsely drawn 6-7 times or medially drawn 7-8 times, if the wire in a delivery sate is a lightly-drawn steel wire, the reduction rate being 10 percent is reserved when the wire is finished, and then the wire is lightly drawn until reaching the specification and size of a finished product; if the wire in the delivery state is a flexible steel wire, the wire is directly drawn until reaching the specification and the size of the finished product.

The invention provides a high-toughness casting aluminum-silicon alloy, as well as a preparation method and application thereof. The aluminum-silicon alloy is prepared from the following components inpercentage by mass: 7 to 8 percent of Si, 0.4 to 0.5 percent of Mg, 0.1 to 0.2 percent of Fe, 0.1 to 0.2 percent of Ti, 0.01 to 0.02 percent of Sr, 0.03 to 0.06 percent of La, 0.02 to 0.04 percent ofCe, and the balance Al and inevitable impurity elements. The preparation method comprises the steps of smelting for preparing aluminum-silicon alloy liquid, thinning for modification, refining for degassing and purifying, casting, and carrying out solid-solution aging treatment. According to the high-toughness casting aluminum-silicon alloy, as well as the preparation method and the application thereof provided by the invention, through optimizing the contents of Si and Mg elements, and thinning and modifying alpha-Al crystalline grains, a beta-Fe iron-rich phase and an eutectic Si phase, alpha-Al branch crystals are converted into fine equiaxed grains, the elongated and flaky beta-Fe iron-rich phase and the eutectic Si phase are converted into fine granulated shapes or short rod shapes,and the damage of the elongated and flaky beta-Fe iron-rich phase and the eutectic Si phase on the strength, the plasticity and the breaking tenacity of the aluminum-silicon alloy is eliminated. The casting aluminum-silicon alloy provided by the invention has high strength, good plasticity and excellent breaking tenacity, is suitable for casting various stress structural members such as automobilelight-weight structural members.

The invention provides a 2xxx series aluminum alloy with high strength and high plasticity and a manufacturing method thereof. The aluminum alloy of the invention comprises the following components: 3.8-4.6wt% of Cu, 1.32-1.56wt% of Mg, 0.5-0.7wt% of Mn, less than or equal to 0.15wt% of Ti, less than or equal to 0.25wt% of Zn, less than or equal to 0.10wt% of Cr, less than or equal to 0.2wt% of Si and less than or equal to 0.2wt% of Fe. The manufacturing method of the aluminum alloy of the invention comprises the following steps: firstly, adding an aluminum ingot into a resistance furnace; when the melt temperature is 740-760 DEG C, adding AlCu50, AlMn10 and AlCr5 intermediate alloys, and stirring; after the temperature falls to 720-730 DEG C, adding Mg and Zn, removing slag and refining; when the temperature is 730-740 DEG C, adding Al-5Ti-B, stirring and standing for 10-25 minutes and then casting and forming; homogenizing and annealing the cast ingot at 500 DEG C for 24h, and then, extruding the cast ingot at 400-490 DEG C; carrying out solid solution on the extruded material at 490-500 DEG C for 1-2 hours; and carrying out water quenching, and putting the material at room temperature to T4 state to obtain a board. By reasonably adjusting the contents of Cu and Mg in the aluminum alloy, the material has better comprehensive mechanical properties and is an ideal material for manufacturing aviation components.

The invention discloses a high-resistant chromium-nickel electric heating alloy and a preparation process thereof. The chemical formula of the high-resistant chromium-nickel electric heating alloy is Cr20Ni80Al; the raw material formula of the high-resistant chromium-nickel electric heating alloy comprises the following components in percentage by weight: less than or equal to 0.03 percent of C, 1.40 to 1.60 percent of Si, less than or equal to 0.30 to 0.50 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 20.5 to 21.50 percent of Cr, less than or equal to 0.10 percent of Ti, less than or equal to 3.5 to 3.7 percent of AL, less than or equal to 1.00 percent of Fe, less than or equal to 0.2 percent of Zr, and the balance of Ni and inevitable impurities. According to the high-resistant chromium-nickel electric heating alloy, the electrical resistivity of the electric heating alloy is improved; the electrical characteristics are better; the anti-oxidation performance of an alloy material is improved; the high-temperature strength of the alloy is improved; the service life of the alloy is prolonged.

The invention discloses an iron and nickel-based hard alloy cutter material, which comprises the following materials in percentage by weight: 82-87 percent of TiC or WC serving as a substrate, 6-10 percent of hydroxyl iron powder and/or hydroxyl nickel powder serving as a bonding agent, 7-8 percent of one or more of TaC and VC serving as a grain growth inhibitor and 1-2 percent of Cr3C2 serving as a hardening agent. Due to the adoption of a hard alloy, defects existing in the prior art can be overcome; and iron and nickel are used instead of Co, so that a cutter made of the material with the method has the advantages of high hardness and high toughness, and has an excellent effect which compares favorably with the conventional Co-containing hard alloy material.

The invention provides a high-strength crackle glazed ceramic product. The product comprises a blank and glaze. The glaze comprises kaolin, quartz, potassium feldspar, clay, cordierite and talc. The glaze comprises potassium feldspar, albite, calcite, kaolin, dolomite, quartz, barium carbonate, zinc oxide, zircon and plant ash. A preparation method of the high-strength crackle glazed ceramic product comprises: mixing blank materials, mixing glaze materials, respectively adding water into the blank materials and the glaze materials, carrying out wet grinding through a ball mill, carrying out screening to obtain blank slurry and glaze slurry, preparing a blank from the blank slurry, carrying out biscuiting, carrying out glazing and carrying out firing. The glaze layer of the ceramic productcontains patterns with different brightness and the patterns are distributed layer by layer like crystal flowers so that antique artistic beauty is created.

A high-strength hard aluminum alloy containing the following metal elements: 0.5-1.5% silicon, 0.5-1.0% iron, 2.5-6.5% copper, 0.5-1.0% manganese, 2-4% magnesium, 0.03-0.1% nickel, Zinc 0.1-0.5%, titanium 0.25-0.55%, beryllium 0.005-0.01%, niobium 0.22-0.52%, chromium 0.35-0.75 and the balance aluminum. The alloy obtained by the invention can be strengthened by high heat treatment, has good plasticity in annealed and just quenched states, can be quenched and aged, has good clothing stability, and can be used to make highly composite parts and components, such as skeleton parts on aircraft, Rivets, compressor blades, discs, welded parts such as containers, etc.

The invention discloses a high-tenacity and high-plasticity amorphous alloy. The high-tenacity and high-plasticity amorphous alloy is characterized in that according to the element composition and the atom mole percentage of the amorphous alloy, Zr accounts for 50% to 60%, Al accounts for 10% to 16%, a component M1 accounts for 26% to 30%, and a component M2 accounts for 2% to 5%; the component M1 includes two elements in Cu, Co, Ni, Fe, Ti, Sc, Mn and Mo, wherein the atom mole percentage of one single element is not lower than 12%; and the component M2 includes one of Y, Ag, Nb, Ta and Hf. The amorphous alloy can be applied as a high-tenacity and high-plasticity material, for example, the amorphous alloy is applied to consumer electronic products, automobiles, medical apparatus and instrument products, the jewelry industry, the stationery industry and the aerospace industry.

The invention belongs to the technical field of rolled steel, and particularly relates to an automotive frame steel with yield strength of higher than 700 MPa and a manufacturing method thereof. The automotive frame steel comprises the following minor elements in percentage by mass: 0.05-0.12% of carbon, 0.08-0.2% of silicon, 1.2-2.1% of manganese, 0.03-0.06% of niobium, 0.06-0.2% of titanium, at most 0.25% of molybdenum, 0.35-0.55% of chromium, at most 0.02% of phosphorus, at most 0.008% of sulfur, 0.02-0.05% of aluminum, 0.001-0.005% of calcium, at most 0.003% of oxygen and at most 0.005% of nitrogen. The manufacturing method comprises the following steps: carrying out KR desulfurization and RH-process treatment to obtain a casting blank, carrying out rough rolling and finish rolling, quickly cooling, and coiling at low temperature to obtain the required steel. By adopting the three-stage laminar cooling and controlling the speed, temperature and time in the rolling process, the yield-tensile ratio of the steel is lower than 0.9, and the yield strength is higher than 700 MPa.

The invention provides a heat treating method of a TC4-DT titanium alloy bar. The method comprises the steps that the TC4-DT titanium alloy bar is firstly subjected to air cooling after being subjected to heat preservation for 1-2h under the condition that the temperature is (TBeta+5) DEG C to (TBeta+50) DEG C, is then subjected to air cooling or furnace cooling after being subjected to heat preservation for 1-2h under the condition that the temperature is (TBeta-80) DEG C to (TBeta-10) DEG C, and is finally subjected to air cooling after being subjected to heat preservation for 4-8h under the condition that the temperature is 500-600 DEG C, wherein TBeta is the Beta phase inversion temperature of the TC4-DT titanium alloy bar, and the unit of TBeta is DEG C. Through performing a three-stage heat treating process, the alloy plasticity of the TC4-DT titanium alloy bar is improved while the alloy fracture toughness of theTC4-DT titanium alloy bar is increased, the performance can be further enhanced, and excellent matching among the alloy intensity, plasticity and fracture toughness is finally realized.

The invention discloses a Ti-Al-Zr-Mo-V system medium-strength high-plasticity titanium alloy and a preparation method thereof, and belongs to the technical field of titanium alloy materials. The titanium alloy comprises, by weight, 3.0%-5.0% of Al, 1.0%-3.5% of Zr, 2.0%-4.5% of Mo, 1.0%-3.5% of V, and the balance Ti and unavoidable impurity elements. According to the Ti-Al-Zr-Mo-V system medium-strength high-plasticity titanium alloy and the preparation method thereof, the Ti-Al-Zr-Mo-V system medium-strength high-plasticity titanium alloy is obtained by adding the alloy elements of Mo and Zr and adjusting the proportion of Al equivalent weight and Mo equivalent weight properly, the extension strength of the Ti-Al-Zr-Mo-V system medium-strength high-plasticity titanium alloy is 800 MPa to 1000 MPa, and the extension rate is greater than 18%; the strength and the plasticity are matched well, and excellent machinability and excellent cold-forming performance are obtained.

The invention discloses a manufacturing method for ultrathin-wall titanium tubing. The method includes: firstly, deseaming a titanium tube with the wall thickness of 0.15mm-1.0mm to obtain a tube billet; and secondly, uniformly daubing lubricant on the inner surface of the tube billet prior to performing one-time rolling for the tube billet daubed with the lubricant by a cold pilger mill, and then sequentially performing oil removing, acid washing and vacuum heat treatment for the rolled tube billet so that the ultrathin-wall titanium tubing with the external diameter of 15mm-50mm, the wall thickness of 0.1mm-0.5mm and the ratio of the wall thickness to the external diameter not larger than 0.02 is obtained. The ultrathin-wall titanium tubing is manufactured smoothly by a traditional cold rolling method and by means of controlling mechanical property, rolling Q values, rolling process parameters, tube billet internal diameter and mandrel clearance, the manufactured tubing is good in surface quality, high in plasticity and uniform in size, and the method is suitable for production of various ultrathin-wall titanium tubings with the cold rolling deformability.

The invention discloses a titanium alloy for laser solid forming and laser shaping repairing, comprising the following components in percentage by weight: 3.6-5.0% of aluminium, 2.1-3.4% of vanadium and the balance of titanium, and the gross is not more than 100%. Compared with TC4 alloy in the prior art, the invention lowers the contents of aluminium and vanadium, and reduces the solid solution reinforcement effect of aluminium and vanadium in titanium; the strength of titanium alloy is lowered, plasticity is improved, and the strength and the plasticity of the titanium alloy are comparative to a TC4 alloy forged piece. The mechanical property of the laser deposition state of the titanium alloy is as follows: tensile strength is 910-980MPa, yield strength is 840-915MPa, elongation rate is 13-17%, and reduction of area is 39-50%. The invention not only can be used for laser shaping and repairing, but also can be used for high-energy beam processing technology, such as electron beam deposition shaping, electron beam overlaying, plasma overlaying and shaping and the like.

The invention discloses 6 series aluminum alloy. The 6 series aluminum alloy comprises, by weight, Mg, Mn, Si, Cr, Zr, Cu, 0-0.32% of Fe, 0-0.25% of Zn, 0-0.1% of Ti, and the balance Al and certain inevitable impurity elements. A technology for preparing a prestretching board of the 6 series aluminum alloy includes the steps that (1) the 6 series aluminum alloy is prepared, and casting, soaking treatment and preheating are performed in sequence; (2) hot rolling and cooling are conducted; and (3) solution hardening is carried out, and accordingly the prestretching board can be obtained. By the adoption of the technology for preparing the 6 series aluminum alloy and the prestretching board thereof, the strength of the alloy board is effectively improved, the structural organization and energy storage condition inside the alloy are improved, and grain refinement is realized; and the strength and plasticity of the alloy board are improved, and bending and cracking are reduced. Through the step-by-step interaction and influence in the method, the grain size can be effectively controlled, the rugged orange peel phenomenon of the alloy board surface after stretching is eliminated, and the mechanical property and surface quality of the board are improved.

The invention discloses a medium carbon steel wire rod with high strength and high plasticity and a production method thereof. The medium carbon steel wire rod comprises the following one or more chemical components in percentage by weight: 0.40 to 0.50 percent of C, 0.15 to 0.40 percent of Si, 0.70 to 1.20 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.05 percent of Al, less than or equal to 0.05 percent of Ti, less than or equal to 0.005 percent of B, less than or equal to 0.40 percent of Cr and the balance of Fe andunavoidable impurities; the production method comprises the processes of melting, heating billet, wire rod rolling and wire rod cooling. The tensile strength of the medium carbon steel wire rod is larger than or equal to 700 MPa, the reduction of are is larger than or equal to 55 percent, the elongation is larger than or equal to 28 percent; the microscopic structure is formed by granular ferriteand fine lamellar pearlite, the particle size of the ferrite is 7 to 9 grade, the Wechsler tissue level is less than or equal to 1 grade; the steel wire rod used by drawing of a client can keep highstrength and plasticity index.

The invention relates to the technical field of biodegradable high polymer materials, in particular to a biomass composite for a toothbrush handle and a preparation method of the biomass composite. The biomass composite mainly comprises the following raw materials: 50-65 parts of poly butylenes succinate, 20-40 parts of polylactic acid, 15-30 parts of modified starch, 10-20 parts of modified woodflour, 2-8 parts of nano talcum powder, 0.1-0.5 parts of compatilizer, 0.2-0.8 parts of antioxidant, 0.2-0.6 parts of lubricant and 0.8-1.5 parts of antibacterial agent. Through a synergistic effect of components, the toughness, plasticity, strength, antibacterial properties and degradability of the biomass composite are improved; and at the same time, the cost is greatly lowered, so that the large-scale production and application are facilitated.

The invention discloses a modified graphene based composite asphalt modifier. The modified graphene based composite asphalt modifier is prepared from modified graphene and an SBS (Styrene Butadiene Styrene) modifier; the modified graphene is prepared by adding a styrene monomer and lauryl sodium sulfate into an oxidized graphene microchip solution, conducting ultrasonic concussion on the obtainedmixed solution, adding potassium peroxodisulfate, reacting in an oil bath, then adding hydrazine hydrate, raising the temperature to 100 DEG C at the same time, reacting for 4-6 hours, cooling, filtering through a microfiltration membrane, washing and drying. The invention further discloses a preparation method and application of the modified graphene based composite asphalt modifier. The high-and-low temperature performance and the plastic property of the modified asphalt prepared by using the composite asphalt modifier are obviously improved, the anti-rutting performance and the elastic property are greatly improved, the defects of not high durability and not good high temperature property of the SBS modified asphalt are effectively improved, and compared with the graphene microchip notmodified, the dispersibility and the stability of the modified graphene microchip in the asphalt are greatly improved.

The invention belongs to the technical field of cold forging steel and particularly relates to a Cr-B system low-carbon high-strength cold forging steel wire rod and a manufacturing method of the Cr-Bsystem low-carbon high-strength cold forging steel wire rod. The main chemical ingredients of the Cr-B system low-carbon high-strength cold forging steel wire rod comprise 0.16-0.24% of C, 0.55-0.90%of Cr, 0.032-0.065% of Ti, 0.0020-0.0040% of B and not larger than 80ppm of N, wherein Ti/N is controlled to be larger than 4. The manufacturing method includes the procedures of converter smelting,LF refining, square billet continuous casting and wire rod rolling. According to the Cr-B system low-carbon high-strength cold forging steel wire rod and the manufacturing method of the Cr-B system low-carbon high-strength cold forging steel wire rod, by optimizing ingredient design of the elements of Cr, B, Ti, N and the like, the hardenability of the steel is effectively improved, the cold forging performance of the steel is improved, it is achieved that the low-carbon cold forging steel wire rod can be used for producing 12.9-grade high-strength fastener without annealing, and the machiningcost of producing high-strength fasteners for a downstream industry is significantly lowered.

The invention provides an overall design phase safety analysis method for an advanced reactor. The method comprises the following step: in step S1, advantages and shortcomings of design are identified via a qualitative safety characteristic inspection tool and advices are given accordingly; in step S2, physical phenomena in a specific situation and importance degree rankings thereof are evaluated via phenomenon identification and a ranking table; in step S3, via a defense function tree form analysis system, challenges faced by safety objects and safety functions are evaluated; in step S4, according to execution results of steps S1-S3, whether safety measures and system design are reasonable is confirmed, and preliminary design is completed. The method disclosed in the invention is based on safety regulations, defense in depth and basic safety functions; opinions of experts in different fields are considered according to an information base of system design, accident analysis, experiment data and code analysis; comprehensive transverse and longitudinal analysis results can be quickly obtained on anything from systems to parts or even in-depth partial layers according to research demand and purposes.

The invention relates to good plasticity mold core molding sand, which is prepared from the following raw materials by weight: 20-30 parts of chromite sand, 10-14 parts of bauxite, 15-20 parts of brown corundum powder, 6-8 parts of alpha-Al2O3 micro-powder, 2-3 parts of sodium tripolyphosphate, 1-2 parts of dimethyl silicon oil, 4-5 parts of a furan resin, 14-18 parts of poly carbosilane powder, 220-240 parts of clay, 2-3 parts of fatty acid sodium, 4-5 parts of potassium methyl silicate, a proper amount of water, and 20-30 parts of an auxiliary agent. According to the good plasticity mold core molding sand, the clay is used, such that the matching cost is low, the chilling effect is good, and the gas permeability is good; the alpha-Al2O3 micro-powder is added, such that the plasticity is good, the thermal conductivity is good, the molding sand is suitable for mold core manufacturing, and the cast hole shrinkage and dispersed shrinkage solving effect can achieve more than 90, and the cast yield can be increased; the auxiliary agent of the present invention adopts alumina and other high temperature resistance materials, such that the auxiliary agent can not melt during casting, the adhesion of the clay particles can be prevented, and the recycling is easily performed; and the clay is wrapped on the surface, and the binding force with the clay particles is strong.

The invention provides a clay material for 3D printing and a preparation method of the clay material. To obtain the clay material suitable for a 3D printing technique, clay is modified, and the clay material is obtained, has the advantages of good plasticity, easiness in forming, good mechanical performance and high precision, is suitable for a 3D printing and forming technique, promotes popularization and application of the 3D printing and forming technique and has wide market prospect.

The invention provides a warm-rolling process method of a titanium alloy thin plate and comprises the following steps: firstly, heating a titanium alloy thin plate with a certain thickness up to 300-400 DEG C; secondly, preheating a roller of a rolling mill to 30-60 DEG C; warm-rolling the heated titanium alloy plate for 1-3 turns, and obtaining the rolled slab; and thirdly, orderly performing the finished product annealing, acid washing and fixed-dimensional shearing, obtaining the titanium alloy thin plate with the thickness of 1.2-3 mm. In the invention, the titanium alloy plate is delivered to the preheated rolling mill after being heated within the temperature scale of lower than the recrystallization temperature, in order to perform the warm-rolling; compared with the cold-rolling process technique, the invention can slow down the hardening rate of the titanium alloy, improve the accumulated deformation rate of the rolling turn, reduce the intermediate heat treatment frequency, shorten the production cycle and improve the working efficiency; meanwhile, the method can effectively prevent edge crack, slag at head and tail parts and micro-crack, and improve the surface quality; the invention is easy to control, simple and convenient to operate and applicable to the industrial production on a large scale.

The invention discloses a high-resistance electrophoretic aluminum profile being resistant to cracking caused by bending and a preparation method of the aluminum profile, and relates to the technicalfield of aluminum alloy materials. A substrate material of the aluminum profile comprises the following elements in percentage by weight: 0.46-0.55% of Si, 0.68-0.78% of Mg, 0.25-0.33% of Fe, 0.12-0.18% of Mo, 0.22-0.30% of Mn, no more than 0.05% of Cr, no more than 0 .05% of Cu, no more than 0.10% of Zn, and the balance Al and inevitable impurities, wherein the content of a single impurity is lower than or equal to 0.05%, the total content of the impurities is lower than or equal to 0.15%, and the ratio of Mg to Si in the substrate material is higher than or equal to 1.43 and lower than or equal to 1.60. The preparation method comprises the following steps: smelting, homogenization treatment, primary extrusion, secondary extrusion, aging treatment, anodic oxidation treatment and electrophoretic painting. Through the interaction among all the alloying elements, the aluminum profile disclosed by the invention is high in toughness and plasticity; during the preparation process, crystal grains become finer and more uniform through two extrusion forming operations, the strengthening effect is good, both the mechanical properties and the processing properties of such an alloy are obviously improved, and the possibility of cracking and other phenomena during the bending deformation processing process is low; and accordingly, the aluminum profile is resistant to cracking caused by bending and high in resistance.

The invention discloses low-silver-content cadmium-free solder and relates to the technical field of soldering. The low-silver-content cadmium-free solder is prepared by proportionally smelting raw materials comprising silver, copper, zinc, manganese and nickel, uniformly stirring, casting, and subjecting a cast ingot to squeezing and drawing so as to obtain a needed solder wire material. The low-silver-content cadmium-free solder comprises, by weight, 24%-26% of the silver, 31.5%-35% of the zinc, 0.8%-2.5% of the manganese, 0.5%-2.0% of the nickel, and the balance copper. By adding small amounts of the nickel and the manganese in the silver solder, wettability and joint strength of the solder can be enhanced, good effects on crystal boundary purification, plasticity improvement and strength enhancement can be achieved, processability of the low-silver-content cadmium-free solder can be improved, and production cost is lowered since silver content is reduced.

The invention discloses a preparation method of high-strength and corrosion-resistant industrial filter cloth. The method comprises the steps of firstly, mixing polyethylene powder and polypropylene for modifying, heating the mixture together with polyethylene terephthalate (PET), polytetrafluoroethylene emulsion, liquid butyronitrile rubber, diphenyl silanediol and modified graphene under the vacuum condition for carrying out second modification; then, carrying out melting extrusion by using a twin-screw extruder, and jetting silk yarns by using a spinneret plate of a spinning box, cooling, sizing to obtain netting silk yarns; finally, weaving a net by using the netting silk yarns to obtain the industrial filter cloth. The industrial filter cloth prepared by the method provided by the invention is modified by twice, so that all the components of the filter cloth have high degree synergism; therefore, the water permeability, mechanical performance, corrosion resistance and use stability of the filter cloth are improved by all the components together.