98results about How to "Eliminate internal defects" patented technology

The invention discloses an aluminum alloy workpiece additive manufacturing method implemented through friction stir welding. On the basis of an existing electric arc additive manufacturing aluminum alloy workpiece, the characteristic that aluminum alloy is soft in property is combined, after an aluminum alloy workpiece is manufactured from electric arc additives layer by layer, friction stir welding intensification treatment is conducted on each layer, and therefore, defects such as pass gaps, interlayer incomplete fusion, air holes and the like can be eliminated through friction stir weldingwhen each layer is manufactured. Compared with the pure electric arc additive manufacturing aluminum alloy workpiece, by means of the method, the structural state of the aluminum alloy workpiece obtained through additive manufacturing can be improved; the grains can be finer; second-phase grains are finer and are distributed more uniformly; and the dislocation density achieved in the aluminum alloy additive manufacturing workpiece is increased. Compared with existing friction stir welding intensification, grain refining and defect elimination are conducted on each layer of the workpiece so that the strength of the whole workpiece can be improved rather than only surface modification, namely surface intensification, is conducted.

The invention relates to a method for producing thin-gauge dual-phase steel by applying a thin slab continuous casting and rolling process. The method comprises the steps: continuously casting molten steel to form a continuous casting slab with the width of 1300-1600mm and the thickness of 62-94mm; then, sequentially carrying out rough rolling, heat insulation by a heat insulation cover, induction heating, high-pressure water scale removal and finish rolling to obtain ultrathin strip steel with the width of 1300-1600mm and the thickness of 1.5-1.8mm; and finally, carrying out controlled cooling, coil-by-coil shearing and coil winding. A finished product of the thin-gauge dual-phase steel has the yield strength of 370-390MPa, the tensile strength of 590-630MPa and the elongation rate of larger than or equal to 15%. By using the method, hot-rolled thin-gauge dual-phase steel of which the size precision, slab shape precision and comprehensive mechanical property can meet requirements can be stably produced.

The invention relates to a method for producing ultrathin low-carbon steel by use of a thin slab casting and rolling process. The method comprises the following steps: continuously casting molten steel into a continuous cast billet with the width of 1,300-1,600 mm and the thickness of 60-100 mm; then sequentially conducting rough rolling, heat preservation by a heat holding cover, induction heating, high-pressure water phosphorus removal and finish rolling to obtain ultrathin strip steel with the width of 1,300-1,600 mm and the thickness of 0.8-1 mm; and finally, performing controlled cooling, roll-dividing cutting and roll take-up. A produced ultrathin low-carbon steel end product has the yield strength of 250-310 MPa, the tensile strength of 350-400 MPa and the ductility of larger than or equal to 35%. By adoption of the method, stable production of hot-rolled ultrathin low-carbon steel with the thickness of 0.8-1 mm can be realized, the dimensional accuracy, the flatness accuracy and the comprehensive mechanical property can be improved, the demand for 'replacement of cold product by hot product' is met and the production cost is lowered.

The invention discloses a method for forging a large steel shaft forging. The method comprises the following steps of: performing cogging, chamfered edge rounding, whole stretching for the first time, whole stretching again, section-by-section forging and the like on a medium carbon steel standard octagon ingot of which the carbon content is 0.3 to 0.4 percent. The step of whole stretching for the first time comprises the following steps of: heating a forged piece to a primary forging temperature; stretching on a forging hammer with a flat anvil; and reaching the deformation rate of 29 to 31 percent at the effective hole welding temperature of over 900 DEG C so as to overcome internal defects of the forged piece. The step of whole stretching again comprises the following steps of: heating the forged piece to the primary forging temperature; stretching on the forging hammer with the flat anvil; and reaching the deformation rate of 15 to 20 percent at the final forging temperature of 800 DEG C. And the single-time deformation rate of each section when the section-by-section forging is performed should not be less than 20 percent. The method of the invention effectively overcomes the internal defects of the material, reduces the material and working time waste, more reasonably distributes the deformation rate of each step, contributes to the reduction of the forging deforming force and realizes ideal material mechanical property.

The invention discloses a liquid forging technology method for a 6061 material commercial vehicle aluminum alloy shaft head. The method mainly comprises the following steps of alloy component optimizing, smelting, melt purifying, liquid forging forming, demolding, trimming, hole tapping, heat treatment enhancing, machining and surface treatment. Firstly, components of elements in a 6061 alloy are optimized, a proper number of rare earth elements Gd and Sm and a proper number of elements Hf are added in a matched manner, and the vehicle shaft head is prepared through combination of the liquid forging technology; and through optimization of the chemical components of the alloy and the melt purifying technology, the metallographical structure of the alloy is improved, and shrinkage, loosening, air holes, cracks and other inner defects of products are greatly removed. The appearance quality of the shaft head product is obviously improved, the inner defects are obviously reduced, the production efficiency is high, the process is short, the technology cost is low, energy is saved, environment pollution is little, and economic benefits and social benefits are obvious.

The invention discloses a method for casting a blade, which is a method for casting blades by adopting precise casting. The method comprises the following steps: designing a die; manufacturing the die; melting raw materials; preparing blanking; centrifugally casting; cooling for the first time, molding for the second time, and cooling for the second time; trimming, and performing shot blasting; performing hot isostatic pressing. By virtue of the steps of the method, an excellent elimination factor of surface and internal defects of the blade of an engine can be guaranteed, and the internal microscopic tissues can be more uniform.

The invention discloses a method for preparing a Ti2AlNb alloy by using a vacuum pressure infiltration method and a method for preparing the Ti2AlNb alloy. The method disclosed by the invention is used for solving the problems of non-uniform distribution of elements such as Nb and Al and shrinkage cavity, pores and inclusion of the Ti2AlNb alloy in a conventional cast melting method for preparing the Ti2AlNb alloy are solved. The method comprises the following steps: 1, weighing 50.1-56.5 percent of pure Ti powder, 22.5-24.4 percent of Nb powder and 21.0-25.5 percent of Al-Y rare earth alloy block; 2, performing low-energy ball milling on pure titanium particles and niobium powder; 3, putting the rare earth aluminum alloy Al-Y block on the composite titanium and niobium powder, performing infiltration, so as to enable the melted Al-Y alloy to be fully penetrated into the composite titanium and niobium powder, reducing the pressure, performing heat preservation and pressure maintaining, and reacting and sintering to obtain the Ti2AlNb alloy. The method is simple in process, easy to operate, short in preparation period and low in manufacturing cost.

The invention discloses a nickel target blank and a manufacturing method of a target material. The manufacturing method of the nickel target blank comprises the following steps that a nickel ingot isprovided; the nickel ingot is subjected to first annealing process treatment, wherein the temperature of the first annealing process is 900-950 DEG C; and the nickel ingot treated by the first annealing process is rolled to form a primary nickel target blank. Before the nickel ingot is subjected to roll forming, the nickel ingot is subjected to primary annealing process treatment, so that the hardness of the nickel ingot material is reduced, so that the later cutting process is easier, residual stress in the nickel ingot is released, the deformation and cracking tendency of the material is reduced, and the effect of refining grains is achieved. The temperature of the first annealing process is controlled to be 900-950 DEG C, so that the interior of the rolled nickel target blank is free ofdefects, the nickel target material obtained after the nickel target blank is welded to a back plate is also free of defects, and the situation that the target material is scrapped due to the fact that the nickel target blank does not meet the requirement is reduced.

The invention relates to a wrapping cover method suitable for isothermal forging of a Ti-Al-series intermetallic compound. The method comprises the following steps that firstly, wrapping cover pretreatment is conducted; secondly, the surface of a blank of the Ti-Al-series intermetallic compound is coated with a high-temperature anti-oxidization coating; thirdly, in the state that the high-temperature anti-oxidization coating is kept wet, the blank of the Ti-Al-series intermetallic compound is arranged in a wrapping cover, and a transition layer is arranged between the wrapping cover and the blank of the Ti-Al-series intermetallic compound; and fourthly, the wrapping cover is welded and sealed. Compared with the prior art, the wrapping cover method has the beneficial effects that the wrapping cover is simple and easy to use, the production efficiency is high, labor intensity is low, cracking and oxidizing in the Ti-Al-series intermetallic compound deforming process can be effectively prevented, and heat losses of the blank in the transferring process are reduced.

The invention discloses a preparation method of a thermal power generation carburization wear-resisting ball. The preparation method comprises the following process steps: firstly, casting a wear-resisting ball body casting, selecting the following raw materials in parts by weight: 2.2 to 2.6 parts of ferromanganese, 25 to 30 parts of scrap iron blocks, 0.4 to 0.7 part of a waste copper plate and 0.3 to 0.5 part of a slag forming constituent, putting the raw materials into a smelting furnace for desulfuration, transferring smelted liquid subjected to desulfuration into a medium-frequency induction furnace for continuous smelting and heat insulation, adding a spheroidizing agent which is 0.5 to 1.2 percent of the weight of the smelted liquid into the medium-frequency induction furnace for spheroidizing at the temperature of 900 to 960 DEG C, and pouring in a die to obtain the wear-resisting ball body casting. According to the preparation method, the wear-resisting ball body and a wear-resisting layer are respectively obtained by pouring twice, so that the wear-resisting ball is high in mechanical property and impact toughness; furthermore, most components in the thermal power generation carburization wear-resisting ball are conventional elements, so that the production cost is low, and the preparation method is convenient to popularize.

The invention belongs to the technical field of aluminum alloy metal machining and discloses a production process of a high-performance 6061 aluminum alloy for cell phone card slot and key materials.According to the production process, a high-performance 6061 aluminum alloy plate is obtained through the steps of smelting and casting, homogenization treatment, machining face-milling, hot rolling,cold rolling to the finished product thickness, solution treatment and quenching at a continuous quenching line, manual aging treatment and the like, the tensile strength Rm of the high-performance 6061 aluminum alloy plate reaches 300 MPa or above, the hardness HV of the high-performance 6061 aluminum alloy plate reaches 90 or above, and on the one hand, the high-performance 6061 aluminum alloy plate has good machining performance and can be suitable for early CNC machining of the cell phone card slot and key materials; and on the other hand, the high-performance 6061 aluminum alloy plate hasgood anodic oxidation performance, can be oxidized into various bright colors and thus is quite attractive, a layer of uniform and luster-consistent protecting film is formed on the surfaces of the materials after oxidation, the hardness and abrasion resistance of a cell phone card slot and keys are greatly improved, and the service life of a product is prolonged.

The invention discloses a preparation method of a wear-resistant ball for cement. The preparation method comprises the following step that a wear-resistant ball workblank is obtained through pouring, wherein a wear-resistant ball workblank alloy comprises, by weight percentage, 3.2-3.4% of C, 0.9-1.2% of Si, 0.4-0.8% of Mn, 0.002-0.01% of P, 0.005-0.013% of S, 1.4-1.7% of Cr, 0.14-0.18% of RE, 0.15-0.35% of W, 0.04-0.12% of V, 1.25-1.45% of Ni, 0.03-0.06% of Te, 0.02-0.08% of Cu and the balance iron. According to the preparation method of the wear-resistant ball, internal defects of a material are effectively eliminated; wear resistance and fatigue strength of the wear-resistant ball are improved; meanwhile, the preparation method has the beneficial effects of being free of oxidation, free of decarburization, free of element depletion and the like; and heat treatment deformation of the wear-resistant ball can be reduced.

The invention discloses a light super-strong aerogel heat-insulating coating and a preparation method thereof, and belongs to the technical field of high-temperature-resistant heat-insulating coatings, and the light super-strong aerogel heat-insulating coating comprises the following components: an inorganic binder, aerogel powder, a hollow heat-insulating filler, reinforced fibers, a thickener, a surfactant, a dispersant and deionized water. The coating prepared by the invention has the characteristics of good dispersion performance, good stability and the like; an aerogel coating formed after curing and drying has the characteristics of high temperature resistance, light weight, good heat insulation performance, high crack resistance and the like; ultrasonic-assisted preparation is adopted, large bubbles in the coating are eliminated, micron-sized bubbles are formed, the porosity of the coating is increased, and the heat insulation capacity of the coating is improved; and the preparation method is simple, convenient and suitable for industrial production.

The invention discloses a liquid forging process method for a 6061-material commercial vehicle aluminium alloy hub. The liquid forging process method mainly comprises the following steps: alloy component optimizing, smelting, melt purifying, liquid forging moulding, de-moulding, trimming and forming holes, performing heat-treatment strengthening, machining and performing surface treatment. According to the liquid forging process method for the 6061-material commercial vehicle aluminium alloy hub, a vehicle hub is prepared by optimizing the components of various elements in a 6061-alloy first, then matching and adding suitable amounts of rare elements Gd and Sm and element Hf, and combining a liquid forging process; by optimizing the chemical components of the alloy and a melt purifying technology, the metallographical structure of the alloy is improved, and internal defects, such as hole shrinkage, hole loosening, air holes, cracks and the like in a product are greatly eliminated. The hub product appearance quality is obviously improved; the internal defects are obviously reduced; the liquid forging process method is high in production efficiency, short in process flow, low in process cost, energy-saving, low in environmental pollution and obvious in economic benefit and social benefit.

The invention discloses an asynchronous cold rolling forming process of an aluminum alloy stainless steel composite plate. The process comprises the following process steps: 1, rolling and compoundinga stainless steel plate and an aluminum alloy plate in an asynchronous rolling mode, and 2, after asynchronous rolling, diffusing and annealing the composite plate, specifically, in the step 1, online heating is carried out on the opposite surface of the composite plate surface of the stainless steel plate, online cooling is carried out on the opposite surface of the composite plate surface of the aluminum alloy plate online, and the heating temperature is 350 DEG C-850 DEG C; the temperature of the composite plate surface of the stainless steel plate from which the composite plate is rolledis lower than 650 DEG C, and the temperature of the composite plate surface of the aluminum alloy plate from which the composite plate is rolled is lower than 300 DEG C; the rolling reduction rate is20%-90%; the different speed ratio of a roller for asynchronous cold rolling is 1.05-1.50; the thickness ratio of the aluminum alloy plate to the stainless steel plate is 1.5-4.0; and in the step 2, the annealing temperature is 250 DEG C-500 DEG C and the annealing time is 15-120 min. The single-side online heating process for rolling the composite plate is creatively provided so as to improve theinterface bonding strength of the composite plate and realize rolling compounding in an interface semi-melting state.

The invention relates to a device for repairing an aircraft thin-walled beam through laser deposition and a repairing method thereof. The device comprises a heating plate, a laser deposition platform,an alternating magnetic field auxiliary platform and a liquid nitrogen forced cooling device, wherein the heating plate is used for carrying the aircraft thin-walled beam to be repaired; the laser deposition platform is used for repairing the aircraft thin-walled beam to be repaired; the alternating magnetic field auxiliary platform is used for providing a magnetic field with the variable direction and intensity, and the alternating magnetic field auxiliary platform is fixed to the laser deposition platform; and the liquid nitrogen forced cooling device is used for cooling the repaired aircraft thin-walled beam. The aircraft thin-walled beam to be repaired is carried on the heating plate for heating and repaired through the laser deposition platform under the magnetic environment providedby the alternating magnetic field auxiliary platform, and then the repaired aircraft thin-walled beam is cooled under the action of the liquid nitrogen forced cooling device. The device for repairingthe aircraft thin-walled beam through laser deposition is good in overall repairing effect, high in efficiency, and low in cost.

The invention discloses a preparation method of a fatigue-resistant alloy lining plate for a ball mill. The preparation method comprises the following process steps that a steel ingot is cast, wherein the steel ingot contains, by weight, 1.3-1.5% of C, 1.5-1.9% of Si, 2.6-2.9% of Mn, 0.7%-1.1% of Mo, 0.004%-0.01% of S, 2.2-2.4% of Cr, 0.3-0.5% of Ni, 0.15-0.21% of Ti, 0.2-0.4% of W, 0.12-0.22% of Al, 0.02-0.09% of Re and the balance iron, The internal defects of the alloy lining plate material are effectively eliminated, the abrasion resistance and fatigue strength of the alloy lining plate are improved, and meanwhile the preparation method has the advantages of being free of oxidation, decarburization and element vaporizing and the like and can effectively improve the ball milling efficiency.