51results about How to "Good metallographic organization" patented technology

The invention discloses a device for preparing semi-solid alloy melt and a process for preparing AlSi9Mg semi-solid alloy. The device comprises a vibrating device which comprises a base and a table top that are connected by a pillar and a rubber spring, the vibrating device is connected with a cooling groove in an inclined way by a supporting frame which can regulate an angle, the table top is provided with a three dimensional vibrating motor, the vibrating acceleration speed is 1 to 2g, the vibrating range is 0.5 to 1mm, the vibrating frequency is 10 to 60 Hz, and a liquid outlet end of the cooling groove corresponds to a forming device. The angle of the cooling groove is 40 to 60 degrees, and the pouring length is 600 to 800mm. The forming device comprises an injection chamber of a die-casting machine, an injection rod, an injection head, a material receiving port and a mold. The rheological forming process for preparing the semi-solid AlSi9Mg alloy melt comprises the steps of alloymelting, gas and slag removing, refining, modifying, inclined vibrating and pouring, rheological die-casting and the like. The device and the process can improve the texture and performance of the semi-solid alloy and solve the problem of solidification and crusting on the surface of an inclined plate in the preparing process.

The invention discloses an automobile gearbox gear carburizing and quenching heat treatment method. The method comprises the following steps: 1, carburizing: placing a gear in a heating furnace, and rising temperature of the heating furnace from room temperature to 900+/-5DEG C for carburizing for 3-4h, wherein the carbon potential CP in a strong carburizing stage is 1.06+/-0.3C%, and the carbon potential CP in a diffusion stage is 0.85+/-0.03C%; 2, quenching: cooling the obtained carburized gear to 830+/-5DEG C, samming for 25-35min, and quenching in 90+/-10DEG C quenching oil; and 3, tempering: tempering the obtained quenched gear at 165+/-5DEG C for 2-3h. The proper reduction of the carburizing temperature and the quenching temperature, the rising of the temperature of the quenching oil and the proper rising of the carburizing carbon potential are carried out on the premise of guaranteeing the quality of a carburized layer, so the carburizing time is not prolonged, and the energy consumption is reduced; and the appearance of black microstructures is prevented, so the surface hardness, the wear resistance and the fatigue strength of the gear are obviously improved, deformation is reduced, the driving balance of the gear is improved, noises are reduced, and the service life of the gear is prolonged.

The invention discloses a thermal treatment method for carburizing and quenching of gearbox gears. The thermal treatment method includes the steps of A, carburizing, B, quenching and C tempering. In the step of A, carburizing, the gears are placed in a heating furnace, the temperature of the heating furnace is increased from the room temperature to the temperature of 850-900 DEG C for carburizing, and carburizing time is 2-5 h; the carburizing process includes a beginning stage, a strong carburizing stage and a diffusion stage; the carbon potential (CP) of the beginning stage is 0.9-1 C%, the CP of the strong carburizing stage is 1-1.1 C%, and the CP of the diffusion stage is 0.8-0.9 C%; the time of the beginning stage is 12-15 min, the time of the strong carburizing stage is 200-220 min, and the time of the diffusion stage is 20-40 min. In the step of B, quenching, the carburized gears are cooled to 810-850 DEG C, then temperature equilibrium is carried out for 20-40 min, and then the gears are quenched in quenching oil with the temperature being 85-95 DEG C. In the step C, tempering, the quenched gears are subjected to tempering at the temperature of 155-170 DEG C for 1-2 h.

The invention discloses a heat processing method for carburizing and quenching. The method comprises the following steps: A) a carburizing step, placing a gear in a heating furnace, and rising temperature of the heating furnace from room temperature to 850-900 DEG C for carburizing for 2-5 h, wherein the carbon potential CP in a strong carburizing stage is 1.02-1.1C%, and the carbon potential CP in a diffusion stage is 0.8-0.9C%; B) a quenching step: cooling the obtained carburized gear to 810-850 DEG C, equalizing the temperature for 20-40min, and quenching in 85-95 DEG C quenching oil; and C) a tempering step: tempering the obtained quenched gear at 155-170 DEG C for 1-2 h. The proper reduction of the carburizing temperature and the quenching temperature, the rising of the temperature of the quenching oil and the proper rising of the carburizing carbon potential are carried out on the premise of guaranteeing the quality of a carburized layer, so the carburizing time is not prolonged, and the energy consumption is reduced; and the appearance of black microstructures is prevented, so the surface hardness, the wear resistance and the fatigue strength of the gear are obviously improved, deformation is reduced, the driving balance of the gear is improved, noises are reduced, and the service life of the gear is prolonged.

This invention relates to gas carburizing the toothed-wheel of heavy duty automobile. It is characterized that this invention utilizes carbon-potential pulsation type gas carburizing, so it overcomes the prior art short comings that carbonization is proceeded under high carbon-potential and diffusion is finished under low carbon-potential. After quenching, the working-pieces have excellent carburized layer concentration gradient distribution, hardness gradient distribution and carburized layer histogram. This inventive method makes parts thus carburized have long service life under complex condition, after the parts are carburized and have gentle hardness gradient.

The invention discloses a continuous casting type large-wall-thickness hot-rolled steel plate for deep sea pipelines and a production method thereof, and belongs to the technical field of pipeline steel. The hot-rolled steel plate is composed of, by weight, 0.03-0.06% of C, 0.15-0.30% of Si, 1.20-1.35% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.0012% of S, 0.01-0.05% of Alt, 0.03-0.05% of Nb, 0.00-0.05% of V, 0.005-0.016% of Ti, 0.25-0.40% of Ni, 0.00-0.30% of Cr, 0.00-0.20% of Cu, 0.00-0.15% of Mo and the balance Fe and inevitable impurity elements. Continuous castings with the thickness being 400 mm are adopted for producing the steel plate with the thickness being 41-48 mm. The steel plate and the production method thereof have the advantages that good metallographic structures are obtained, the Charpy impact toughness at -20 DEG C, the drop hammer toughness at -20 DEG C, the low yield ratio, the high uniform elongation rate, the anti-fracture toughness property CTOD, the A solution acid resistance HIC and SSCC, and the like of the large-wall-thickness hot-rolled steel plate for the deep sea pipelines are realized, and therefore the construction requirement of conveying pipelines of oil and gas fields of deep seas can be met.

The invention relates to an H13 die steel heat treating method and H13 die steel obtained through the same. The H13 die steel heat treating method comprises the steps that a steel ingot obtained through electroslag remelting is heated and forged through the two-time upsetting and two-time stretching technology; three-stage heat insulation treatment is carried out on the forged steel ingot, particularly, first-stage heat insulation is carried out at the temperature of 390-410 DEG C with heat insulation time being 90-100 s/1 mm thick steel, second-stage heat insulation is carried out at the temperature of 640-660 DEG C with heat insulation time being 70-110 s/1 mm thick steel, and third-stage heat insulation is carried out at the temperature of 890-910 DEG C with heat insulation time being 60-110 s/1 mm thick steel. In addition, the invention further relates to the H13 die steel obtained through the H13 die steel heat treating method.

The invention discloses a thermal treatment method for large-section axle-type forge pieces. The thermal treatment method comprises the following steps that a forge piece is normalized with a temperature increasing rate of 4-7 DEG C/min; heat preservation is performed at 910-930 DEG C; the forge piece is air cooled to 500-600 DEG C with a temperature decreasing rate of 60-70 DEG C/min; the forge piece is air cooled to be below 150 DEG C with a temperature decreasing rate of 5-10 DEG C/min; quenching is performed with a temperature increasing rate of 4-7 DEG C/min; heat preservation is performed at 860-880 DEG C; then quenching is performed; the forge piece is rapidly cooled to be below 150 DEG C with a temperature decreasing rate of 100-150 DEG C/min; the forge piece is placed into an oil cooling system for cooling; tempering is performed with a temperature increasing rate of 4-7 DEG C/min; heat preservation is performed at 640-660 DEG C; and the forge piece is air cooled to an operable temperature with a temperature decreasing rate of 5-10 DEG C/min. By adopting the thermal treatment method, the large-section axle-type forge piece can get a good metallographic structure, and have high strength and toughness; and particularly, the core part structure of the large-section axle-type forge piece can be refined, so that the core part and the superficial structure of the large-section axle-type forge piece have the same metallographic structure and mechanical property.

The invention relates to a hot-rolled wire rod for a cord thread with tensile strength being the 4000MPa grade. The hot-rolled wire rod is prepared from the components in percentage by weight: 0.71 to0.75 percent of C, 0.36 to 0.40 percent of Si, 0.10 to 0.14 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 0.10 to 0.25 percent of Cr, and 0.0005 to0.0015 percent of B. A production method comprises the steps of smelting through a converter; carrying out RH vacuum treatment; continuously casting into small square ingots; slow cooling the ingot blanks; heating the ingot blanks; rolling at high speed; spinning; and air cooling for standby use. According to the hot-rolled wire rod for cord thread with tensile strength being the 4000MPa grade andthe production method provided by the invention, through reducing the content of carbon, improving the content of silicon, and adopting the matched process, on the premise of ensuring the tensile strength to be larger than 4000MPa, the diameter of a wire material reaches to 3.0 to 3.5mm, so that the fracture surface of the wire material is homogenized in structure and better in performance, gammacrystal particles are micronized, the aging during wire drawing processing is inhibited, and the fracturing of a cementite is inhibited; and the strength and the wire drawing limit of the wire material are improved, the times of stranding filament break does not exceed 2 times/ton steel, and secondary processing by a user can be omitted and simplified, so that the production cost is reduced, andthe production efficiency is improved.

The invention relates to a single-mold casting machine capable of tilting at 90 degrees to form aluminum piston workblanks through pouring and a use method of the single-mold casting machine capable of tilting at 90 degrees to form the aluminum piston workblanks through pouring. The casting machine comprises a rack, a workbench, tilting oil cylinders, a pouring system, a hydraulic system and an electric system, wherein the workbench is arranged on the rack, the pouring system is arranged on the workbench, aluminum liquid is introduced into the pouring system to form the piston workblanks through pouring, the tilting oil cylinders are arranged at two sides of the bottom of the rack respectively, the other end of each tilting oil cylinder is connected with the workbench, the tilting oil cylinders and the pouring system are all connected with the hydraulic system, and the hydraulic system is connected with the electric system. According to the single-mold casting machine capable of tilting at 90 degrees to form the aluminum piston workblanks through pouring and the use method of the single-mold casting machine capable of tilting at 90 degrees to form the aluminum piston workblanks through pouring, the single-mold casting machine capable of tilting at 90 degrees to form the aluminum piston workblanks through pouring tilts at 90 degrees to form the piston workblanks through pouring, thus the aluminum liquid is subjected to inertia pouring under the action of gravity, a pouring cavity is filled with the aluminum liquid from bottom to top, thus air gap effects of flat pouring are avoided, and meanwhile, feeding positions of the piston workblanks are adjusted to side surfaces, so that effects on the performance of a piston combustion chamber are avoided, and the mechanical performance and the thermal fatigue resistance performance of the piston workblanks are improved.

A precess for preparing the material dedicated for the valve of Cl gas includes such steps as smelting pig iron, used steel and returns in MF furnace, adding Fe alloy, Si and Mn, refining, casting and heat treating to obtain the chloric acid-resistant nodular cast iron.

The invention discloses a ZG25MnSY6 casting material. The ZG25MnSY6 casting material consists of the following components by mass percent: 0.15-0.2% of C, 0.3-0.45% of Si, 0.8-1.1% of Mn, less than or equal to 0.01% of S, less than or equal to 0.015% of P, less than or equal to 0.06% of Al, 0.6-0.9% of Cr, 1-1.2% of Ni, 0.3-0.5% of Mo, 0.1-0.15% of V and the balance of Fe, 100% in total. The invention also discloses a method for preparing a casting by using the ZG25MnSY6 material. According to the casting material, a certain alloying element is reduced or increased, smelting is carried out in an electric-arc furnace and refining furnace, an alterant is added in the later refining stage and heat treatment is carried out, so that the metallographic structure of the casting is good, the mechanical property of the casting is greatly improved, the strength and toughness are enhanced, and the service time of the casting is prolonged.

The invention relates to a double-mold automatic casting machine capable of rotating by 90 degrees to pour an aluminum piston blank anda using method of the double-mold automatic casting machine, and belongs to the technical field of piston casting. The device comprises a pouring system, a part taking mechanical hand, a joint pouring robot, a hydraulic system, an electrical operating system and a quenching cooling box, the pouring system is arranged on the ground, the part taking mechanical hand is arranged on the ground on one side of the pouring system, the joint pouring robot is arranged on the opposite side of the pouring system, and the joint pouring robot extracts molten aluminum to pour the molten aluminum into the pouring system. The quenching cooling box is arranged on one side of the part taking mechanical hand, the part taking mechanical hand clamps the piston blank poured by the pouring system to the quenching cooling box, the pouring system is connected to the hydraulic system, and the hydraulic system, the part taking mechanical hand and the joint pouring robot are all connected to the electrical operation system. The overall automatic operation is achieved, the production efficiency is improved, and the mechanical performance and the thermal fatigue resistance of the piston blank are improved.

The invention relates to valve material of liquid alkali nickeliferous nodular cast iron, and belongs to a manufacturing method of valve material of alloy alkali resistant nodular cast iron applied in the chemical industry. The manufacturing method comprises the following steps: charging cast iron, scrap steel and foundry returns into an IT intermediate frequency furnace to heat, adding ferroalloy, silicon, manganese, nickel and copper after melting, then performing casting and moulding after smelting and finally performing heat treatment. The valve material of the alkali resistant nodular cast iron can be produced steadily through the method. The material has the advantages of excellent alkali resistance, high comprehensive mechanical property and ideal metallurgical phase structure. The alkali resistance of the valve is improved considerably than the like products.

The invention discloses a city building waste alcohol-based casting coating. The city building waste alcohol-based casting coating is characterized by being prepared from the following raw materials in parts by weight: 65-85 parts of quartz tailings, 14-20 parts of high-alumina cement, 1-2 parts of magnesium oxide, 2-3 parts of ferric oxide, 1-3 parts of furnace clinker, 5-8 parts of petroleum coke, 0.3-0.6 parts of an MCA fire retardant, 0.7-1.2 parts of a styrene-acrylic emulsion, 8-14 parts of city building wastes, 2-4 parts of phenolic resin, 2-5 parts of hexamethylenetetramine, 45-60 parts of ethanol and 3-6 parts of an aid. The preparation method has the advantages that the materials are reasonably selected, and the process is simple; the city building wastes are added into the raw materials after being modified, so that various technical indexes of the coating are enhanced, meanwhile, the processing problem of the wasted building wastes is relieved, the environment is protected, and the prepared coating has good sintering character, high temperature resistance and heat preservation character.

The invention relates to application of new nitrided steel in manufacturing of a diesel engine plunger and barrel assembly. The application comprises the following steps of 1, pretreatment before nitriding, 2, workpiece cleaning before nitriding, 3, surface nitriding treatment, 4, workpiece grinding, and 5, workpiece vacuum coating. The diesel engine plunger and barrel assembly made of the new nitrided steel has the advantages of aluminum-containing nitrided steel and aluminum-free nitrided steel, the defects of the aluminum-containing nitrided steel and the aluminum-free nitrided steel are overcome, and after composite heat treatment, the use performance of a low-speed diesel engine plunger pump can be improved, and emission is reduced.

The embodiment of the invention provides a method for processing large single-weight titanium and titanium alloy wire rods. Bar billets are processed by adopting a billet preparation technology of titanium alloy large single-weight wire rods, a multi-die drawing technology, and a continuous annealing technology under inert gas protection to finally obtain the titanium alloy wire rods. Compared with the titanium alloy wire rods manufactured by a traditional hole die drawing process, the titanium alloy wire rods manufactured by the processing method have the advantage of better stress state, andwith compressive stress as the main and tensile stress as the supplement, grains in the titanium alloy wire rods are effectively refined, the hollow phenomenon is completely eliminated, and then thetitanium alloy wire rods with a good metallographic structure are obtained. The test report shows that the mechanical property deviation of the titanium alloy wire rods of the same batch, manufacturedby the processing method, is about 5%, which improves the stability and the consistency of the titanium alloy wire rods.

The invention belongs to the technical field of detection machines, and particularly relates to a detection device and a detection method for the sealing performances of expansion tanks. The detection device comprises a plurality of expansion tanks to be detected, a rack, a clamp device and a water inlet device, wherein the rack is made of an aluminium alloy material, and the rack comprises the following composition elements in the following percentages by mass: 1.00-1.50% of Si, 0.50-1.00% of Mg, 0.10-0.20% of Fe, 0.05-0.08% of Cu, 0.02-0.07% of Zn, 0.08-0.12% of Mn, 0.02-0.06% of Ni, 0.05-0.10% of Sb, 0.12-0.15% of Ti, not greater than 0.025% of single impurity elements in other impurity elements, not greater than 0.1% of total impurity elements, and the balance of aluminium. The device is high in detection accuracy level and detection efficiency.