1473 results about "Cooling speed" patented technology

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2100MPa-grade stranded wire and a manufacturing method of the high-strength complex-phase hot-rolled wire rod, after a C-Si-Mn-Cr-Mo high-carbon component system is rolled and spun into a wire rod, the wire rod is subjected to online molten salt strong quenching isothermal treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is cooled at a cooling speed of greater than or equal to 33 DEG C / s, and enters a bainite phase region from an austenite state; the method comprises the following steps: firstly, carrying out first-stage molten salt treatment to promote transformation of austenite into bainite, then carrying out later-stage molten salt treatment to form a structure mainly comprising bainite, carrying out isothermal tempering on the structure, reserving part of untransformed retained austenite, and finally, carrying out roller way slow cooling to promote transformation of the untransformed retained austenite into martensite, and carrying out tempering, the microstructure of the hot-rolled wire rod comprises a complex-phase structure composed of tempered bainite and tempered martensite, the tensile strength of the hot-rolled wire rod can reach 1435-1485 MPa, the percentage reduction of area of the hot-rolled wire rod is 31%-36%, off-line heat treatment of follow-up machining is avoided, and the risk of wire breakage is reduced.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2060MPa-grade stranded wire and a manufacturing method of the high-strength complex-phase hot-rolled wire rod. After high-carbon chemical components containing trace V are designed, rolled and spun into a wire rod, the wire rod is cooled at a cooling speed of more than or equal to 33 DEG C / s through on-line molten salt semi-quenching treatment, enters a bainite and pearlite mixed phase region from an austenite state, and is subjected to hot rolling and hot rolling at a cooling speed of more than or equal to 33 DEG C / s; the method comprises the following steps: quenching bainite and a sorbite structure to form a structure mainly comprising the quenched bainite and the sorbite structure, then carrying out isothermal tempering, and finally carrying out roller way slow cooling to prepare the hot-rolled wire rod of which the microscopic structure comprises a complex-phase structure consisting of tempered sorbite and tempered bainite, so that a component system can be simplified, the material cost can be reduced, network carbides can be effectively controlled, and meanwhile, the complex-phase structure can be regulated and controlled; the high strength and plasticity of the wire rod are matched, the tensile strength is 1390-1440 MPa, the percentage reduction of area is 32%-37%, and the steel wire rod is used for manufacturing 2060 MPa grade stranded wires and other application fields and is beneficial to downstream wire drawing and twisting processing.

The invention belongs to the technical field of casting, and particularly relates to a process for improving the appearance quality of a casting by using a sand-isolating chilling block, which comprises the following steps: step 1, during molding or core making, firstly paving a layer of molding sand between risers or in a hot spot area; step 2, fixing the chilling block by using molding sand or supporting nails to ensure that the position of the chilling block is stable; 3, sand is discharged to wrap the chilling block, and it is ensured that a sand layer is firm through compaction operation; 4, after the molten steel is poured, heat of the molten steel is conducted to the chilling block through the sand layer, the local cooling speed of the casting is increased, and sequential solidification is achieved; and 5, after pouring, heat preservation is conducted till box opening is conducted, and an intact casting is formed. According to the invention, a layer of molding sand with a specific thickness is placed between the external chilling block and the mold, so that the external chilling block is converted into the sand insulation chilling block, and in order to ensure that the chilling block achieves the effect of process design requirements and can effectively play a chilling role on a casting, the thickness and size of the chilling block and the thickness of a sand insulation layer can be properly adjusted according to the size of a hot spot of the casting.

The invention relates to a hot-rolled wire rod for a 2100MPa-grade stranded wire and a manufacturing method thereof, after a high-carbon and high-silicon component system is rolled and spun into a wire rod, the wire rod is cooled at a cooling speed of more than or equal to 31 DEG C / s through online molten salt sorbite regulation and control treatment, and enters a sorbite phase region from an austenite state; the method comprises the following steps of: forming a structure mainly comprising a sorbite structure, performing isothermal tempering, promoting fusing of a part of sorbite lamellas, and finally performing roller way cover opening and slow cooling to prepare the hot-rolled wire rod of which the microscopic structure comprises a mixed structure consisting of tempered sorbite, tempered ferrite and fused sorbite, so that alloy components can be simplified, and the strong plasticity matching and the structure uniformity of the wire rod can be improved; the tensile strength is 1420-1470 MPa, the percentage reduction of area is 36%-41%, the composite material is used for the application field of manufacturing 2100 MPa grade stranded wires and the like, off-line heat treatment can be avoided, and the risk of wire breakage during downstream drawing and twisting is reduced.

The invention provides a welding tool for an automobile rear auxiliary frame cross beam, and belongs to the technical field of automobile cross beam welding, the welding tool comprises a base, a rear auxiliary frame main body, an operation table and a welding robot, and the operation table and the welding robot are arranged on the base, and the welding tool further comprises a positioning splicing assembly and a flow guide destressing assembly; protective gas is integrated on the third clamping jaw, the third clamping jaw can effectively guide protective gas flow to a welding seam while fixing the side cross beam, and effective flow guide of the protective gas can be achieved in cooperation with arrangement of the movable spraying pipe; during welding, the impeller is static to block gas, the flow speed is reduced, welding fluid is prevented from splashing and losing due to overlarge airflow impact, and stable combustion of welding arcs is maintained; in the cooling stage after welding is completed, the inductor controls the electromagnetic base to be powered off, gas flow is increased, the cooling speed is increased, meanwhile, vibration is generated to be matched with cooling to eliminate welding residual stress, the stability and reliability of a weldment are improved, the production period can be shortened, and the production efficiency is improved.

The invention relates to a hot-rolled wire rod for a 1960MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after high-carbon components of C-Si-Mn-Cr-B are rolled and spun into a wire rod, the wire rod is subjected to rapid online molten salt isothermal treatment, and the wire rod is subjected to front-section molten salt treatment, so that the wire rod is cooled at the cooling speed of more than or equal to 32 DEG C / s and enters a sorbite phase region from an austenite state; the steel wire rod is subjected to rear-section molten salt treatment, the molten salt temperature is reduced, unconverted retained austenite is promoted to be converted into the sorbite structure, meanwhile, isothermal tempering of the structure and fusing of a part of sorbite lamellas are promoted, and finally slow cooling is conducted through a roller way; the microstructure of the hot-rolled wire rod comprises a mixed structure composed of tempered sorbite, ferrite and fused sorbite, the tensile strength is 1305-1355 MPa, the percentage reduction of area is 37%-42%, and the hot-rolled wire rod is used for being used as base metal to manufacture high-strength stranded wires and other application fields and is beneficial to reducing the risk of wire breakage.

The invention provides a production method of a steel wire rod and a welding wire, and the production method of the steel wire rod comprises the following working procedures sequentially performed on a square billet: a heating working procedure: the square billet sequentially passes through a preheating section, a heating section and a soaking section, the temperature of the preheating section is controlled to be 820-870 DEG C, the temperature of the heating section is controlled to be 950-1000 DEG C, the temperature of the soaking section is controlled to be 1000-1040 DEG C, and the total heating time is 70-90 minutes; in the rolling procedure, rough rolling, intermediate rolling and finish rolling are conducted on the heated square billet to obtain a wire rod, the finish rolling inlet temperature is controlled to be smaller than or equal to 850 DEG C, the rolling speed is controlled to be 100-110 m / s, and the spinning temperature is controlled to be 780-810 DEG C; and a cooling process: after spinning, controlling the cooling speed to be less than or equal to 0.6 DEG C / s, and cooling the wire rod to 500-550 DEG C. According to the production method of the steel wire rod, the steel wire rod has a small-size structure, drawing is facilitated, the mechanical property of the same circle is uniform, the thickness of the oxide layer is uniform, and shelling is facilitated.

The invention relates to the technical field of perfume bottle production and forming, and discloses forming equipment for perfume bottle production, which comprises a supporting frame, the top of the supporting frame is fixedly connected with a supporting column, the top of the supporting column is fixedly connected with a top plate, the top of the top plate is fixedly connected with a hydraulic cylinder, and the output end of the hydraulic cylinder is fixedly connected with an upper mold. The top of the upper mold is fixedly connected with a sliding column, the sliding column is slidably connected into the top plate, the top of the supporting frame is fixedly connected with a lower mold, and a cooling assembly is arranged in the lower mold. According to the perfume bottle molding device, the output end of the hydraulic cylinder drives the upper mold and the lower mold to extrude and clamp each other, and then a cooling pipe is cooled through a cooler and a fan, so that the effect of rapidly cooling a perfume bottle in the molding process is achieved, and the problem that the cooling speed is low when a traditional natural cooling mode is used is solved; and the production efficiency of the forming equipment is improved.

The invention relates to a 1300 MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, after a Cr-Nb-V medium carbon component design is adopted for rolling and spinning to form a wire rod, the wire rod is subjected to online molten salt micro-quenching tempering treatment, the wire rod is controlled to enter a lower bainite phase region from a high-temperature austenite state at a cooling speed greater than or equal to 31 DEG C / s, and a quenching structure mainly comprising quenching bainite is formed; the steel wire rod with a microscopic structure comprising tempered bainite and ferrite is prepared by carrying out isothermal tempering and toughening destressing treatment on a quenched structure and finally carrying out roller way slow cooling, so that the material cost can be properly controlled, the strength and plasticity matching of the steel wire rod is improved, the tensile strength is 1255-1305MPa, and the percentage reduction of area is 58-63%, so that the steel wire rod can be directly processed into a part after being subjected to cold processing molding, and the service life of the steel wire rod is prolonged. And tool steel production energy consumption, cost reduction and efficiency improvement are facilitated.

The present invention discloses a multifunctional and convenient reaction chamber for an electrically triggered Joule heating device and an operating method thereof, wherein the reaction chamber comprises a sealing cover and a base that are buckled together, wherein a first conductive fixing clamp and a second conductive fixing clamp are provided in parallel on the inner bottom plate of the base, wherein a sample fixing clamp is clamped and fixed between the first conductive fixing clamp and the second conductive fixing clamp, wherein electrodes are respectively mounted on both ends of a clamping plate on one side of the sample fixing clamp, and the electrodes at both ends are respectively in contact with and cooperate with the corresponding side clamps of the first conductive fixing clamp and the second conductive fixing clamp, wherein the sample is arranged between the clamping plates that are opposite to each other and the two ends of the sample are respectively in contact with and cooperate with the electrodes, and a cooling system is respectively provided on both sides of the sample fixing clamp. The present invention also discloses an operating method for a multifunctional and convenient reaction chamber for an electrically triggered Joule heating device. The present invention can achieve a higher precursor loading amount and a faster cooling speed, and can also meet the requirements of preparing a sample vacuum environment and a variety of reaction atmospheres.

The invention relates to the technical field of aluminum alloys, in particular to a high-strength aluminum profile and a preparation method thereof. The problems that in the prior art, an aluminum profile is low in mechanical property and insufficient in corrosion resistance are solved. Magnesium, silicon, a copper-cerium alloy and a metal erbium element are added into an aluminum ingot, and melting treatment is carried out step by step, so that a smelted alloy is obtained; the smelted alloy is refined through a refining agent, preliminary die casting, segmented extrusion forming and multi-segment aging treatment are combined, the temperature, time and cooling speed of each process are accurately controlled, and an aging treatment profile is obtained; and zinc deposition treatment is carried out, and the high-strength aluminum profile is prepared by optimizing the zinc deposition process and strictly controlling the temperature and time of primary zinc deposition and secondary zinc deposition and the thickness of a zinc deposition layer. Through the adding of all elements and the synergistic effect of process steps and parameters, the strength and corrosion resistance of the aluminum profile are effectively improved.

The utility model belongs to the technical field of cooling, and relates to a uniform cooling device for an air-cooled turntable, which comprises a base, a circular plate is rotatably connected to the top of the base, a motor is fixedly connected to the top of the base, a first gear is fixedly connected to the output end of the motor, a gear ring is fixedly connected to the bottom of the circular plate, and the first gear is meshed with the gear ring. According to the structure, a product can be uniformly blown in multiple directions, so that the cooling speed of each position is relatively uniform, the overall cooling speed of the product is improved, the influence of non-uniform cooling on the stability of crystal grains is reduced, and the influence on the quality of the product is further reduced.

The invention relates to the technical field of shoemaking equipment, in particular to a cold and hot setting machine for shoe processing and a setting technology.The cold and hot setting machine for shoe processing comprises a machine body, a hot mold assembly, a shoe mold assembly and a cold mold assembly, the hot mold assembly is arranged on one side of the machine body and used for conducting heat setting on toe cap fabric, and the cold mold assembly is arranged on the other side of the machine body; the shoe mold assembly and the cold mold assembly are both arranged on the machine body, the cold mold assembly is opposite to the shoe mold assembly in the vertical direction, and the cold mold assembly is used for conducting cold setting on the shoe head fabric obtained after heat setting. The middle flexible pressing pads are arranged, materials at the thick positions of the turnup parts are promoted to be dispersed to all positions of one circle of the turnup parts through intermittent rotation of the two middle flexible pressing pads, so that the thickness consistency of all positions of one circle of the toe cap fabric is improved, and in the subsequent cooling and shaping process of the toe cap fabric, the thickness uniformity of the toe cap fabric is improved. The cooling speeds of all parts of the toe cap fabric in one circle are basically consistent, so that the cooling and shaping effects of the shoe mold assembly on the toe cap fabric are better.

The invention discloses an efficient injection mold for a POM transmission part and a forming process of the efficient injection mold, and relates to the technical field of POM transmission part injection molding.The efficient injection mold comprises a base, a lower mold is fixedly installed above the base, a top plate is arranged above the lower mold, the four corners of the base and the four corners of the top plate are fixed through guide columns, and an upper mold is installed below the top plate; the contact surfaces of the lower die and the upper die are provided with forming cavities, the lower die is provided with first cooling pipes around the forming cavities, the upper die is provided with second cooling pipes around the forming cavities, the two sides of the upper end face of the lower die are provided with first connectors, and the two sides of the lower end face of the upper die are provided with second connectors. After the lower mold and the upper mold are assembled, the first connector and the second connector are communicated, and mold assembly positioning detection is carried out in the butt joint process, so that the problems that the cooling speed of a separated mold on a POM transmission part is low, and the forming effect of the transmission part is poor due to the fact that a cooling area is not uniform are solved.

The invention relates to the technical field of quenching equipment, and provides an online quenching system which comprises a lifting mechanism and a box body, the top of the box body is covered with a box cover, the lifting mechanism is used for lifting the box body, the box body is provided with a cooling mechanism, and the cooling mechanism comprises a water spraying mechanism and an air spraying mechanism. During working, a heated metal workpiece is placed in the box body, the cooling mechanism is started, and the cooling mechanism comprises the water spraying mechanism and the air spraying mechanism. The water spraying mechanism is driven by a water pump, water is conveyed to a conveying pipe network arranged in the box body and the box cover through a pipe network, and the workpieces are evenly sprayed with water to be cooled through a plurality of spray heads. The air injection mechanism supplies air to a lower air cavity installed in the box body and an upper air cavity installed in the box cover through a third fan and a fourth fan, air injection cooling is conducted on a workpiece through an air outlet head, the combination mode can flexibly adjust the proportion and speed of water injection and air injection according to actual requirements, and therefore accurate control over the cooling speed is achieved.

The utility model relates to the technical field of injection molds, in particular to an injection mold cooling system which comprises a base, a sliding rod is fixedly connected to the base, a bottom plate is slidably arranged on the sliding rod, a lower mold is arranged on the bottom plate, a hydraulic rod used for pushing the bottom plate to move along the sliding rod is arranged on the base, and a top plate is fixedly connected to the top of the sliding rod. An upper mold is arranged on the top plate, the upper mold and the lower mold are respectively provided with a forming cavity, a sprue bush is mounted on the top plate, the sprue bush is communicated with the forming cavity of the upper mold, a plurality of heat conduction pipes are inserted into the upper mold and the lower mold at intervals, one end of each heat conduction pipe is processed to form a large-head end, and the other end of each heat conduction pipe is processed to form a small-head end. Cooling cavities are formed in the top plate and the bottom plate, the large-head ends are located in the cooling cavities, the top plate and the bottom plate are jointly connected with a circulating assembly, and the effects that the cooling speed of plastic parts in the injection mold is increased, and the injection molding work efficiency is improved are achieved.

The invention belongs to the technical field of rolling, and particularly relates to an anti-decarburization and anti-brittle failure controlled cooling process for a high-silicon-chromium alloy tool steel wire rod. Aiming at the dilemma that the hot-rolled wire rod which contains more than 2.0% of Si, more than 1.1% of Cr, Mo, V and other alloy elements not only meets the decarburization requirement of a product, but also does not have brittle failure of the wire rod, the method comprises the following steps: firstly, determining the cover entering temperature of the hot-rolled wire rod, the cooling speed of the wire rod before the hot-rolled wire rod enters the cover and other key process parameters; and then the method is realized by adjusting the speed of a roller way, the number of opened heat preservation covers after spinning, a fan Jinling device, the air volume of a fan, the spinning temperature and the like, so that the hot rolling structure of the wire rod is a pearlite structure which is not easy to brittle, and meanwhile, the requirement that the decarburization of a product does not exceed 0.55 D (D is the diameter of the wire rod) is met.

The invention relates to the technical field of semiconductor process equipment, and discloses a high-uniformity semiconductor heat treatment equipment heat preservation structure capable of being rapidly cooled, the high-uniformity semiconductor heat treatment equipment heat preservation structure comprises a main body assembly and a positioning assembly, the main body assembly comprises a furnace body shell and a wafer boat arranged in the furnace body shell, and an inner layer high heat conduction layer is arranged on the outer side of the wafer boat; an outer low-heat-conduction insulating layer is arranged on the outer side of the inner high-heat-conduction layer; the positioning assembly comprises a heat dissipation piece and a fixing piece installed on the outer side of the heat dissipation piece, and the fixing piece is connected with a locking piece. The heat dissipation piece comprises a heat dissipation pipe and a heat dissipation medium channel formed in the heat dissipation pipe, and the outer side of the heat dissipation pipe is connected with a connecting pipe; the problems that in the prior art, the axial thermal field uniformity of the inner wall part of a furnace body heating chamber is poor, the constant-temperature area range is reduced, meanwhile, thermal insulation materials are pulverized and cracked due to local overheating, the service life of a furnace body is shortened, the cooling speed is low, a process cooling curve is out of control, and the product quality is affected are solved.

An indoor simulation device and method for a wheel rolling on an icy and snow-covered road surface. The temperature, humidity, and the surface temperature of the test piece in the experimental chamber are respectively collected by a temperature sensor, a humidity sensor, and an infrared temperature sensing device. Then, the start and stop of the snow-making system are controlled through a control box, so as to adjust the experimental environment to meet the conditions of simulating harsh winter driving conditions such as snowfall and freezing rain. Finally, the start and stop of the wheel rolling device are carried out. The snow-making system of this device has the advantages of good refrigeration effect, fast cooling speed, and can reach -196°C. At the same time, this device can simulate the process of a wheel rolling on the road surface during actual driving, and is used to evaluate various fast, effective, and environmentally friendly snow removal methods and the anti-slip performance of the road surface after the wheel rolls on the road surface indoors.

The invention discloses a cladding forming device based on cable production, and relates to the technical field of wire and cable production, the cladding forming device comprises a fixing frame, a feeding cylinder is arranged at the upper end of the fixing frame, a spiral feeding rod is rotatably connected to the interior of the feeding cylinder, and a feeding port is formed in the right side of the top end of the feeding cylinder; a coating assembly is arranged below the feeding cylinder, a cable core body is arranged in the coating assembly, and a cold water tank is arranged on the side of the fixing frame. A circulating box is arranged at the bottom end of the cold water tank, and a circulating filtering mechanism used for filtering cooling water is arranged in the circulating box. According to the coating forming device based on cable production, the output end of the driving motor rotates and drives the rotating rod to rotate, the rotating rod can drive the fan blades to rotate when rotating, the contact area of cooling water and air is increased when the fan blades rotate, and then the cooling speed of the cooling water is increased; and the cooling water can be conveniently recycled in the follow-up process.

The application discloses an easy-to-cut steel with excellent plasticity and drilling performance and a preparation method thereof, and the preparation method comprises the following steps: converter smelting, LF refining, continuous casting, hot rolling and air cooling line cooling; in the continuous casting step, the water quantity of a crystallizer is 130-140 m 3 / h, and the secondary cooling water quantity is 0.8-1.0 L / kg; in the air cooling line cooling step, the cooling speed is 1-1.5 DEG C / s from the spinning temperature to greater than 650 DEG C, and the cooling speed is 2-4 DEG C / s in the range of 650 DEG C-500 DEG C; under the condition of not adding easy-to-cut elements and increasing production cost, the plasticity and drilling performance of the easy-to-cut steel are significantly improved by controlling the manganese sulfide inclusion size, hardness and structure of the rolled material.

The invention discloses a method for refining and homogenizing crystal grains of a 9%-12% Cr steel thick-wall large forge piece, and belongs to the field of ferrous metallurgy. According to the method, the large forge piece is heated to be close to the critical point of the complete austenitizing temperature in a stepped mode, the large forge piece is subjected to heat treatment by regulating and controlling dispersive precipitation of carbides in an initial structure and uniform nucleation of austenite and / or introducing a small amount of undissolved ferrite, residual precipitated phases and multi-phase interfaces and controlling the cooling speed; nucleation particles of pearlite transformation in the vibration heat preservation process are remarkably increased, uniform distribution of granular pearlite in the supercooled austenite is promoted, structural inheritance is cut off and eliminated, and the purpose of grain refining and homogenizing after performance heat treatment is achieved. According to the method, the grains of the thick-wall large forge piece are refined to 5 grades or above, the cross section grain size difference is within 2 grades, a series of problems that in the production process, grass waves exist in ultrasonic flaw detection, the grain size is unqualified, and the low-temperature impact toughness does not reach the standard can be solved, the product percent of pass and the production efficiency are remarkably improved, and meanwhile the production energy consumption is reduced.

The invention relates to the technical field of laser welding, in particular to a thin-wall aluminum alloy butt joint laser pulse welding method which comprises the following steps of part pretreatment, part assembly, back shielding gas filling, welding parameter adjustment and welding, and inspection and treatment after welding. The energy density of 100-150J / mm is taken as a target reference, the peak duration is reversely limited to be within 8-12ms, and the corresponding peak power is matched, so that the energy of laser pulse acting on a welding area is concentrated and is not overloaded, the burn-through defect caused by too high local temperature of the thin-wall aluminum alloy is avoided, the welding seam forming integrity is guaranteed, and the cold crack problem is solved. According to the method, the basic value power is increased to 600-800 W, meanwhile, the pulse frequency is adjusted to 50-80 Hz, the continuous heat preservation effect is provided for the molten pool by increasing the basic value power, the pulse interval is shortened in cooperation with the high pulse frequency, the cooling speed of the molten pool is slowed down, thermal stress accumulation is reduced, the cold crack generation probability can be greatly reduced, and the mechanical stability of a connector is improved.

The utility model relates to the technical field of cooling beds for aluminum profiles, and discloses a rapid cooling bed for aluminum profile machining, which comprises a machine body, a cooling pond is arranged in the machine body, and four first waterproof cylinders distributed in a rectangular array are fixedly connected in the machine body. The tops of the four first waterproof air cylinders are fixedly connected with two connecting columns which are symmetrically distributed in the left-right direction, and the opposite sides of the two connecting columns are fixedly connected with two fixing columns which are symmetrically distributed in the front-back direction. A plurality of conveying rollers which are transversely distributed at equal intervals are arranged on the opposite sides of the two fixing columns. The rapid cooling bed for aluminum profile machining has the beneficial effects of rapid cooling and the like, and the problem that when a cooling liquid spraying mode is used, the cooling liquid cannot be sprayed to the bottom of an aluminum profile, and consequently the cooling speed of the aluminum profile is ordinary is solved.

The invention discloses a method for controlling the hardness of a CrMo steel welding heat affected zone, which belongs to the technical field of welded joint performance control, and comprises the following steps of: preheating a base metal before welding at the preheating temperature of not lower than 200 DEG C; sequentially welding a backing weld bead, a hot weld bead, a filling weld bead and a cosmetic weld bead on the base metal; the interlayer temperature does not exceed 300 DEG C; before the cosmetic weld bead is welded, the temperature of the base metal is not lower than 260 DEG C; the base metal is subjected to postweld heat treatment, the temperature is increased to 480 DEG C at the temperature increasing speed of 80-150 DEG C / h, and heat preservation is conducted for 1-3 h; raising the temperature to 650 DEG C at the temperature raising speed of 80-150 DEG C / h, and keeping the temperature for 7-9 hours; cooling to room temperature at a cooling speed of 80-150 DEG C / h; according to the method, the preheating temperature during preheating before welding, the interlayer temperature in the welding process, the lowest temperature of base metal during cosmetic weld bead welding and the heat preservation temperature and the temperature increasing and decreasing speed of all stages of postweld heat treatment are controlled respectively, the hardness upper limit value of the CrMo steel welding heat affected zone can be effectively controlled, and the safety and reliability of a welded joint are improved.

The invention discloses a manufacturing process of an NO7718 nickel base alloy nut for nuclear equipment. The manufacturing process comprises the steps of material preparation, hot forging, shot blasting, solid solution heat treatment, physical and chemical detection, finish machining, precipitation hardening heat treatment and detection packaging. The hot forging near-net forming technology is adopted, the shape of the nut blank is directly obtained through plastic deformation, the cutting allowance of machining is greatly reduced, a large number of raw materials are prevented from becoming sweeps, the material utilization rate is remarkably increased, and the raw material cost is effectively reduced; by accurately controlling the initial forging temperature, the final forging temperature and the cooling speed of hot forging as well as subsequent solution treatment and precipitation hardening treatment, grains can be refined, and the precipitation form and distribution of a strengthening phase can be controlled, so that the microstructure of the material is optimized, and the material obtains more excellent comprehensive mechanical properties such as higher strength, plasticity and toughness cooperation; and the harsh working condition requirements of nuclear equipment can be better met. The process provided by the invention ensures the stability and consistency of product performance.

The invention relates to the technical field of cooling towers, in particular to a novel water-saving open type cooling tower suitable for northern areas. A tower body; the heat exchange demisting and water collecting device, the wire mesh demisting device, the water collector, the hot water distributing device, the cold water supplementing and spraying device and the filler cooling device are sequentially arranged on the inner wall of the tower body in the vertical direction; the anti-freezing device is arranged at the top of the pouring cold water pool; and the PLC is arranged at the top of the pouring cold water pool. The cooling tower can achieve efficient and rapid cooling, and the cooling speed is increased by 20%-30% compared with a traditional tower through filler layered heat exchange, cold water replenishing opposite flushing and waste heat recovery; the freezing problem in winter in northern areas can be solved, freezing is blocked from the source, ice is actively melted, and operation is guaranteed; the drifting rate is reduced by more than 60% through three-stage demisting water collection, and the condensed water is completely recovered; low-cost transformation is achieved, maintenance is convenient, energy consumption is reduced by 30%, intelligent regulation and control can be achieved, industrial automation is adapted, and high efficiency, water saving, economy and stability are considered.

The invention relates to an aluminum plate casting and rolling control method and system, and the method comprises the steps: collecting real-time technological parameters, including molten aluminum temperature, aluminum plate thickness, rolling speed, rolling pressure, cooling speed and surface quality information, in an aluminum plate casting and rolling process, and predicting aluminum plate temperature distribution, stress strain, thickness change and potential defects based on thermodynamics and mechanical models; the casting speed, the rolling speed, the rolling pressure and the cooling condition of the molten aluminum are dynamically adjusted, closed-loop control is achieved, the system comprises a data acquisition module, a data processing and analysis module, a control and execution module and a man-machine interaction and visualization module, and the system supports automatic correction of thickness deviation and surface defects, abnormal alarm and historical data analysis. The method adopts model predictive control, an artificial intelligence algorithm or a hybrid optimization algorithm to realize adaptive control. The method has the advantages that the thickness uniformity and the surface quality are optimized, the production efficiency and reliability are improved, and the safe, intelligent and efficient operation effect in the aluminum plate casting and rolling process is achieved.

The invention relates to a 1150MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, the wire rod adopts a high-Cr medium-carbon component design, after a steel billet is rolled and spun into the wire rod, on-line molten salt low-temperature quenching isothermal treatment is performed, the wire rod is controlled to be subjected to front-section molten salt treatment firstly, the wire rod enters a lower bainite phase region from a high-temperature austenite state at a cooling speed of more than or equal to 35 DEG C / s, and the steel wire rod is subjected to high-temperature quenching isothermal treatment at a cooling speed of more than or equal to 35 DEG C / s; the method comprises the following steps: quenching bainite to form a structure taking the quenched bainite as a main part, then carrying out rear-section molten salt heating isothermal tempering and toughening destressing treatment, and finally carrying out roller bed cover opening slow cooling to prepare the wire rod with a microscopic structure comprising tempered bainite and ferrite, so that the initiation of an abnormal brittle structure can be inhibited, the structure state of the wire rod is effectively controlled, and the toughness performance matching of the wire rod is improved; the tensile strength is 1050-1100 MPa, and the percentage reduction of area is 59%-64%, so that the alloy can be directly processed into parts after cold forming.

The invention discloses a heat treatment method for regulating and controlling lamellar structures of TiAl alloy forgings, and belongs to the technical field of heat treatment of alloy materials. According to the method, the obtained forged TiAl alloy is placed in a heat treatment furnace with the temperature of T alpha + / -10 DEG C, after heat preservation is conducted for 5-30 min, multi-stage step-by-step cooling is conducted, the TiAl alloy with the fine near-lamellar structure is obtained, the multi-stage step-by-step cooling mode comprises two modes, the first mode is furnace cooling + air cooling, and the second mode is furnace cooling + air cooling + oil cooling; by regulating and controlling the critical temperature point, the cooling speed and possible short-time heat preservation of each cooling stage, accurate control over lamellar regularity, lamellar cluster size and grain refinement degree is achieved, generation of Widmannstatten structures and metastable structures is effectively inhibited, and the structure uniformity and the strength and plasticity matching performance are remarkably improved.