43results about How to "Promotes grain refinement" patented technology

The invention relates to a preparation method of martensite matrix 1,100-MPa-grade rare earth Q and P steel. The steel is prepared from 0.15-0.22% of C, 0.60-1.70% of Si, 1.10-2.40% of Mn, 0.1-0.5% ofMo, 0.1-0.5% of Al, 0.05-0.11% of V, 0.01-0.05% of Y, 0.02-0.04% of P, 0.005% or below of S, 0.040-0.0700% of Nb, 0.0060% or below of N, 0.001-0.006% of B and the balance Fe and unavoidable impurities. After batching, the raw materials are smelt by a converter and refined and continuously cast by a vacuum furnace to obtain a cast blank, then trace alloy powder is added into an arc-melting furnace, a secondary cast blank is obtained, and heating and hot rolling are conducted in sequence; cold rolling is conducted after acid pickling; then the blank is heated to a two-phase region for heat preservation; carbon partitioning and tempering are conducted to obtain the final steel. According to the preparation method, through the addition of an appropriate quantity of various beneficial alloy elements, the contents of C, Si, Mn and other elements in traditional steel species are reduced, the weldability and corrosion resistance are improved, crystal grains are refined, produced steel plateshave good comprehensive mechanical properties, and lightweight, energy conservation and emission reduction of vehicles are facilitated.

The invention relates to the technical field of additive shaft repairing, and provides a shaft surface repairing system and method for additive composite micro-rolling. The system comprises a frame, a plurality of groups of spinning units evenly distributed in the circumferential direction are arranged on the frame, and a middle wear shaft repairing area is constructed; each of the spinning units comprises a first driving device, a first guide rail, a first sliding block and a roller, wherein the first driving device and the first guide rail are fixed to the frame, an output end of the first driving device is connected with the first sliding block, the first sliding block is movably arranged on the first guide rail, the roller is connected with the first sliding block, and the roller surface of the roller is opposite to the circumferential surface of a wear shaft in the middle wear shaft repairing area; and a heating mechanism and an additive printing mechanism are arranged on the frame. According to the shaft surface repairing system for the additive composite micro-rolling provided by the invention, additive shaft repairing and micro-rolling of a repaired part are synchronously achieved, the microstructure and the mechanical property of the repaired shaft are comprehensively improved, the overall performance of the repaired shaft is improved, and the repaired shaft can be put into use again.

The invention discloses preparation of an amorphous nanocrystalline alloy. The amorphous nanocrystalline alloy comprises the components of, by mass, 0.5-8% of Ni, 0.1-0.3% of Co, 1-2% of Cu, 0.01-0.03% of Nb, 3-11% of B, 2-9% of Si, 0.01-3.5% of C, 0.1-3% of P and the balance Fe, and the sum of the content of all the components is 100%. The amorphous nanocrystalline alloy is prepared in the modesthat a master alloy ingot is prepared through induction smelting and then is prepared into a strip belt through the single roll rotating quenching method, then the strip belt is cut to be with the required length and placed in a vacuum annealing furnace, vacuum pumping is conducted, and annealing treatment is conducted under protection of inert gas. The prepared amorphous nanocrystalline alloy canbe used in the field of azo dye wastewater treatment and can be reused, and the preparation cost is low.

The invention provides a high-toughness and high-strength aluminum alloy hub for an automobile and a manufacturing method thereof, and relates to the technical field of automobile hub manufacturing. The aluminum alloy hub is prepared from the following components in percentage by mass: 3.3-4.8% of Si, 1.2-1.7% of Mg, 0.45-0.7% of Mn, 0.2-0.6% of V, 0.35-0.7% of Ti, 0.05-0.13% of Zr, 0.05-0.12% ofRE, and the balance of Al; RE is composed of Yb, Pr, Nd and Sc with the mass ratio being 1:(0.2 to 0.6):(0.3 to 0.8):(0.6 to 1.2). The manufacturing method comprises the steps of smelting, refining, casting, solid solution treatment, deep cold treatment, aging treatment and the like. The manufactured aluminum alloy hub is uniform and dense in structure, high in toughness, high in strength, good incorrosion resistance, high in dimensional stability, excellent in comprehensive performance and long in service life, and has great using prospects.

The invention relates to a Zn-Al-Mg alloy layer used for being hot-dipped to a bridge steel wire surface and a manufacturing method for the Zn-Al-Mg alloy layer. The alloy layer comprises, by mass, 30%-97% of Zn, 5%-60% of Al and 0.02%-11% of Mg, wherein the sum of the percentages of all the components is 100%. The manufacturing method includes the steps that a bridge steel wire is unoiled and derusted; the alloy layer is hot-dipped; and stabilizing treatment is conducted. According to the alloy plating layer, the corrosion resistance is superior to that of an existing zinc plating layer and that of an existing zinc aluminum alloy plating layer, the alloy plating layer is easy to use, meets the requirements of the special environments, such as the requirement for bridge steel wires in the marine corrosion atmosphere environment and has wide market prospects.

The invention relates to a pure-gold watchcase manufacturing method, comprising raw material melting, rough blank forming, stamping treatment and cutting treatment. The invention also relates to a pure-gold watchcase obtained by the above method, and a dial plate comprising the pure-gold watchcase. The dial plate also comprises an inner container, a movement, a graduated disk, a watch glass, a watch crown and an ear part. The inner container comprises an inner container body and a fixed part. The pure-gold watchcase is wrapped at the outer wall of the inner container. The movement is arranged inside the inner container. The graduated disk is arranged on the top surface of the movement in a covering manner. The watch glass is disposed at an opening of the inner container in a covering manner. With the gold content higher than nine hundred and ninety per one thousand, the pure-gold watchcase achieves good machining performance, allows surface treatment, has high strength and hardness and is adapted to normal knock and collision when used. The rejection rate in the pure-gold watchcase manufacturing process is low, and the production efficiency is high. The dial plate comprising the pure-gold watchcase has good waterproofness, and the strength of an outer shell of the dial plate is further enhanced, so the service lifetime of the dial plate is prolonged.

The invention relates to a steel rail thermite welding gating system. The system comprises a sand mold, a crucible body arranged above the sand mold, a crucible cover matched with the crucible body, a shunting plug arranged inside the sand mold, and a base plate arranged at the bottom of the sand mold. According to the system, a reaction crucible and a pouring gate system are both designed to be of a liquid deslagging structure, and the purity of molten steel in a purifying cavity is fully considered. The crucible top cover of the system is in a pneumatic layout mode, reaction high-temperature gas can be dredged and high-temperature liquid-solid splash can be blocked. Two risers at the bottom of the sand mold in the system communicate with each other, and thus the casting feeding capacity is enhanced.

The invention discloses a light alloy plate stamping forming process and stamping device. The light alloy plate stamping forming process comprises the following steps that 1, a light alloy material isheated to the solid solution temperature of the light alloy material or above; 2, the heated light alloy material is placed between a female die and a male die; 3. the detection temperature of each area of the light alloy material is obtained; and 4, when the female die and the male die are closed for stamping, electric pulse treatment is carried out on the areas according to the detected temperature. According to the technical scheme, the production quality, the production energy efficiency and the production efficiency can be favorably improved.

The invention discloses high-strength weather-resistant low-temperature-resistant hot-rolled cap-shaped steel used for a railway freight open wagon and a production technology of the high-strength weather-resistant low-temperature-resistant hot-rolled cap-shaped steel used for the railway freight open wagon, and belongs to the technical field of steel rolling production. The cap-shaped steel comprises the following components in percentage by mass: 0.10 to 0.15 percent of C, 0.20 to 0.65 percent of Si, 1.40 to 1.55 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 0.3 to 1.0 percent of Cr, 0.025 to 0.065 percent of Ni, 0.30 to 0.55 percent of Cu, 0.030 to 0.045 percent of Nb, less than or equal to 0.0002 percent of H, less than or equal to 0.008 percent of N, 0.020 to 0.040 percent of Alt and the balance Fe and trace residual elements. The preparation technology of the high-strength weather-resistant low-temperature-resistant hot-rolled cap-shaped steel used for the railway freight open wagon comprises the steps of blast furnace molten iron production, molten iron pretreatment, converter smelting, argon blowing, LF refining, RH refining, continuous casting full-protection casting, cap-shaped steel rolling and cap-shaped steel straightening. The cap-shaped steel has excellent appearance quality, strength, weather resistance and low temperature resistance at the same time, and the use requirements of the cap-shaped steel in the railway freight open wagon are effectively met so that the safety of the whole wagon can be improved, and the cap-shaped steel has high economic benefits.

The invention discloses a propeller casting forming solidification sequence control device and a control step thereof, and relates to a propeller casting machining device and step, in particular to aforming sequence solidification device and a control step thereof. The control device comprises a sand mold, a propeller blade part control system, a blade root part control system and a propeller hubpart control system; the propeller blade part control system, the blade root part control system and the propeller hub part control system are sequentially arranged from the propeller sand mould blade part to the propeller hub part. The device has the beneficial effects that the structure is novel, machining is easy and convenient, use is convenient, work efficiency is improved, product quality is improved, and cost is reduced; the novel propeller casting forming solidification sequence control device and the control step therefore are integrated with economy and practicability.

The invention relates to a casting process for a 7475 aluminium alloy slab ingot. By the control to chemical components, regulation of the casting stress, improvement on melt purity, strengthening of grain refinement and the like, the defects of cracks and loosening of the 7475 aluminium alloy slab ingot in the casting process are prevented.

The invention discloses a powerful spinning and laser shock peening combined machining method for a thin-wall part. The method comprises the following steps that (1) the outer surface of a blank workpiece is peened, namely laser shock peening is conducted on the blank workpiece through an absorption-layer-free laser shock peening technology; and (2) spinning machining is conducted on the workpiece through mutual cooperation of a spinning wheel and a mold in spinning equipment, and cylindrical or conical large-deformation forming of the metal thin-wall workpiece is achieved. The invention discloses the powerful spinning and laser shock peening combined machining method. The surface of a material is heated and softened by adopting a laser heat effect; the laser force impact effect is adopted to achieve grain refinement, promote part plastic deformation and inhibit springback of the part after spinning, a residual compressive stress layer is introduced, the outer wall tensile stress in the spinning process is counteracted, and initiation and extension of microcracks in the material are inhibited; and forming machining of the thin-wall workpiece subjected to laser shock peening treatment is achieved through the powerful spinning technology, and therefore the material forming precision and performance are remarkably improved.

The invention provides a method for reinforcing an aluminum alloy profile through a nano composite material. Al2O3 and carbon nanotubes in a specific proportion are dispersed under the assistance of microwave ball milling; after the nano composite material is formed, 1/2 of the nano composite material is mixed with aluminum alloy liquid, the dispersity among components and the uniformity of particle mixing are improved advantageously, and the specific surface area of mixing and the surface interaction force of mixing can be effectively increased. Finally, the remaining 1/2 of the nano composite material is added in a filling mode after aluminum alloy is sintered, the combination degree of the nano composite material and the aluminum alloy is reinforced through repeated heating and friction, refining and uniform distribution of crystal grains are further promoted, the crystal boundary stability is improved synergistically, the high strength and plasticity of the aluminum alloy are ensured, and the wear resistance of the aluminum alloy can further be improved significantly. The method for reinforcing the aluminum alloy profile through the nano composite material solves the internal defects of the nano composite material in the aluminum alloy on the whole, and solves the problem of coarse crystal grains of the aluminum alloy.

The invention relates to non-woven fabric, in particular to a high-wear-resistance non-woven fabric. According to the non-woven fabric, a mixed material of polypropylene and nano zinc oxide is adoptedas a raw material, and the non-woven fabric is produced through a continuous one-step method of high-temperature melting, spinneret, laying and hot-press rolling. The non-woven fabric has excellent wear-resistance performance.

The invention discloses a target material for building glass. The target material comprises the following raw materials in parts by weight: 1-5 parts of Sn, 1-2 parts of In, 1-3 parts of Sb, 1-3 parts of Ga, 5-10 parts of Ni powder and 30-40 parts of silicon powder. The target material further comprises 0.5 to 1.5 parts of a refining agent and 0.1 to 0.5 part of an enhancer; the Sn powder, the In powder, the Sb powder, the Ga powder, the Ni powder and the silicon powder are fed into a smelting furnace to be smelted till the raw materials are completely melted; and 2, a refining agent is added into the smelted raw materials, stirring is conducted for 10-30 min at the rotating speed of 100-500 r/min, and then a reinforcing agent is added. The invention relates to a target material for building glass, which is prepared from Sn, In, Sb, Ga and other main metal elements. Architectural glass obtained by coating the target material has excellent corrosion resistance, mechanical scratch resistance, high-temperature oxidation resistance and the like.