35results about How to "Reduce internal residual stress" patented technology

The invention provides a gradient composite material steel rail turnout coating prepared by laser cladding. The composite material is characterized in that a transition layer adopts a Fe-based alloy material, wherein the Fe-based alloy material comprises the following components of, in percentage by weight, 13wt%-17wt% of Cr, 3wt%-6wt% of Ni, 1wt%-1.5wt% of Si, 0.5wt%-1wt% of Mn, 0.3wt%-1.2wt% ofNb, 1wt%-1.5wt% of B, 0.05wt%-0.7wt% of C, 0.5wt%-1.2wt% of V, and the balance Fe; a strengthening layer is arranged above the transition layer, and the strengthening layer adopts a Fe-based metal nano-phase composite material. The preparation method comprises the following steps of preparing the Fe-based metal powder and the Fe-based metal nano-phase composite material coating; preheating a steelrail by using laser scanning heating so as to reduce the temperature gradient; preparing the gradient composite material coating on the surface of the steel rail by utilizing a laser cladding technology, and performing laser scanning heat treatment; and reducing the cooling rate after laser cladding, so that the martensite of the heat affected zone is prevented from being generated, and the cracking property of the coating is reduced. The prepared steel rail frog has the advantages that the hardness curve is smooth, the overall toughness and bearing performance are good, the strength and hardness is higher than a common heavy-load railway frog, the service life is longer, and manufacturing integration is relatively strong.

The invention discloses a reconfigurable die. The reconfigurable die comprises a plurality of closely arranged hydraulic telescopic units and a hydraulic system connected with the hydraulic telescopic units, wherein each hydraulic telescopic unit comprises a pressure maintaining cylinder, a telescopic unit hydraulic valve, a hydraulic cylinder and a pressure head; the hydraulic system comprises an oil inlet line, a pressure maintaining oil line and a regulating valve used for switching between the oil inlet line and the pressure maintaining oil line. The invention also discloses a forming device for the reconfigurable die. A die point control mechanism is used for performing point control over the hydraulic telescopic units in the configurable die to form required curved surfaces. The reconfigurable die is low in cost and high in efficiency; through the closely arranged hydraulic telescopic units, unit contact points of the reconfigurable die and parts are increased, the smoothness of the curved surfaces formed by the reconfigurable die is improved, folds and indentation of punched parts can be reduced, internal residual stress of plates after punching is reduced, and the reconfigurable die is favorable for industrial popularization and application.

The invention discloses a dynamic pressurized tempering furnace for tempering a saw blade matrix. The dynamic pressurized tempering furnace comprises a furnace body (1), a heating device (2) and a bearing platform (3), wherein the heating device (2) and the bearing platform (3) are both arranged in the furnace body (1); the inner wall of the furnace body (1) is provided with a fire protection layer (4); an oil cylinder (6) is vertical to the top of the furnace body (1) and is arranged in the furnace body (1); the bottom of a piston rod of the oil cylinder (6) is provided with a spherical boss (8); a pressure head (7) is internally provided with a spherical groove (9). The dynamic pressurized tempering furnace also comprises a controller, a display (10) and a temperature sensor (11), wherein the controller is connected with the oil cylinder (6) and the heating device (2). The dynamic pressurized tempering furnace is compact in structure, capable of automatically regulating the angle of the pressure head according to the planeness of a saw blade and convenient for workers to operate. After being subjected to thermal treatment by the dynamic pressurized tempering furnace, the saw blade matrix is uniform in crystalline phase tissue, small in internal residual stress and low in saw blade planeness less than 0.03mm.

The invention provides a plate shape control method of an online-quenched high-strength steel plate. The high-strength steel plate is formed by continuously casting blanks through the plate shape control method. The plate shape control method comprises the following steps of 1, heating, 2, descaling, 3, rolling, 4, online quenching, 5, retarded cooling and 6, tempering. The plate shape control method is applicable to a medium-thickness plate production line without arrangement of a pre-straightening machine, through a plate shape control technology, the plate shape quality of the online-quenched high-strength steel plate is improved, after tempering, the plate shape unevenness is controlled to be 7mm/2m or below, hardening and tempering for remedy and size changing are avoided, the production cost is reduced, and the yield is increased.

The invention provides an equipment system and method for automatic cleaning and drying of braces. The equipment system comprises: an automatic loading platform for conveying a tool basket holding to-be-cleaned braces to a designated position; an automatic transferring module for grasping the tool basket and transferring the tool basket to each process position; a cleaning module comprising an ultrasonic cleaning module and a bubble cleaning module and used for cleaning the braces to remove residual materials on the surfaces of the braces; a compressed-air water cutting module for removing a large amount of liquid remaining on the surfaces of the braces after cleaning; a hot-air circulation drying module adopting circulating hot-air drying for evaporation of remaining moisture on the surfaces of the braces; a vacuum drying and sterilization module for sterilization of the braces in a vacuum ultraviolet sterilization manner and further evaporation of moisture; and a self-conveying unloading table for conveying the tool basket holding the cleaned and dried braces to a clean room for separation of the braces from the tool basket.

The invention provides a vinyl ester resin heavy mortar floor which consists of a priming coat, a vinyl ester resin mortar layer and a finish coat layer, wherein the vinyl ester resin mortar layer is directly paved on the priming coat, and an FRP (Fiber Reinforced Plastic) isolation layer is not needed to be manufactured; the once paving thickness of the vinyl ester resin mortar layer is 30-100mm, and the whole vinyl ester resin mortar layer is seamless; the vinyl ester resin mortar layer is prepared from the following raw materials in parts by weight: 1000-1200 parts of quartz sand aggregate, 100-120 parts of vinyl ester resin, 2-3 parts of methyl ethyl ketone peroxide, 1-1.5 parts of cumene hydroperoxide and 1-2 parts of cobalt iso-octoate. The vinyl ester resin heavy mortar floor has the characteristics of high mechanical strength, good load-carrying property, integrally seamless property, excellent anti-permeation property, excellent corrosion resistance property, high construction efficiency and the like, is especially applicable to regions with frequency rolling of heavy machinery, heavy high-altitude falling impact and corrosion caused by the continuous soaking of acid, alkali and saline solutions with relatively high concentrations.

The invention discloses a workpiece machining deformation control method. Reinforcing ribs meeting certain conditions can be reserved through topological optimization in the primary machining stage, the bending rigidity of a workpiece is enhanced, and the machining deformation in the primary machining stage can be reduced to a great extent; the intermediate workpiece reserved with the reinforcingribs in the primary machining stage is placed for 96 hours or longer, after stress redistribution is sufficient and the size is relatively stable, the stable intermediate workpiece is obtained, then thermal vibration composite aging is conducted to reduce residual stress, workpiece deformation is further reduced, and finally the reinforcing ribs reserved in the intermediate workpiece are removed through secondary cutting machining; at the moment, due to the fact that stress is fully released and reduced, the number of the cut reinforcing ribs is smaller than that of removed materials of first-time machining, large stress redistribution caused by first-time machining cannot be generated, and after the reinforcing ribs are cut off, large deformation of a finally-obtained machined workpiece cannot be generated any more, so that the bending rigidity of the workpiece can be effectively improved, and internal residual stress can be reduced.

The invention provides a 3D printing system and method based on selective laser melting. A powder laying movement module conducts powder laying on a forming cylinder molten pool module; a laser scanning module is used for carrying out laser melting on the metal powder in the forming cylinder molten pool module; an airflow protection module provides inert protection gas during 3D printing; and an online monitoring module monitors product data and powder bed data in the forming cylinder molten pool module and data such as gas pressure and flow in the airflow protection module in real time, and controls work of the powder laying movement module, the laser scanning module and the airflow protection module according to the monitored data. The product and the powder bed are monitored in real time through the online monitoring module, and parameters of 3D printing of the next layer are adjusted according to the monitored result, so that abnormity can be found in time when the abnormity occurs in the 3D printing process of the product, the abnormity can be treated in time, and therefore, the SLM3D printing performance of the product is improved, and the problem of how to improve the SLM 3D printing quality is solved.

The invention discloses a heat treatment method of a high-strength and high-flexibility 7055 aluminum alloy. The heat treatment method comprises the steps of double-stage solid solution and T6 manual aging in sequence; after the T6 manual aging step is finished, the high-temperature destressed aging is performed, that is, the insulation is performed by 8-10 hours at 140-150 DEG C; the double-stage solid solution step is to heat a product from the room temperature to 445-455 DEG C along with a furnace for insulation by 0.5-4 hours, to heat the product to 465-480 DEG C by 0.5 hour for insulation 0.5-4 hours and to quench the product at a water temperature of 40-50 DEG C; and the T6 manual aging step is to heat the product from the room temperature to 115-125 DEG C along with the furnace for insulation by 20-26 hours. The heat treatmeetn method maintains higher material strength level, can efficiently reduce residual stress of a sprayed 7055 aluminum alloy product, and meanwhile, improves comprehensive performances of the product. The heat treatment method solves the cracking problem of the product in subsequent machining process, reduces the machining deformation of the product, and improves the size precision.

The invention provides an ultrasonic-assisted laser micro-cladding device for a gradient functional composite material. The ultrasonic-assisted laser micro-cladding device comprises a rack, a preset piece sample preparation assembly and an ultrasonic-assisted laser micro-cladding assembly, wherein the preset piece sample preparation assembly and the ultrasonic-assisted laser micro-cladding assembly are installed on the rack. The ultrasonic-assisted laser micro-cladding assembly comprises a laser micro-cladding head assembly and an ultrasonic-assisted workbench assembly. The invention also provides an ultrasonic-assisted laser micro-cladding method for the functional gradient composite material, which comprises the following steps: in the early stage of implementation, according to the gradient material theory, preparing a preset sheet sample through the procedures of controlling the component proportion of the copper-based composite material, performing a wet ball milling process, performing ultrasonic-assisted processing on the preset sheet, performing vacuum drying and demolding and the like; and then preparing the preset sheet sample into the graphene/copper-based gradient functional composite coating through a multi-channel and multi-layer processing mode under the action of a composite energy field based on an ultrasonic-assisted laser micro-cladding process. According to the method, the high-quality gradient functional composite coating can be formed in a metallurgical bonding mode through the laser micro-cladding technology.

The invention discloses an ultrasonic auxiliary powder forming method in the fluid environment. Firstly, powder particles are formed under the action of hydrostatic pressure, the density of powder pressing blanks reaches about 80% of the theoretical density of the powder pressing blanks, application of the hydrostatic pressure is kept, power ultrasounds are introduced, and the powder pressing blanks are further densified and are uniform in stress under the ultrasonic vibration action. According to the ultrasonic auxiliary powder forming method in the fluid environment, the power ultrasounds are introduced in the powder particle hydrostatic pressure forming process, mobility and filling performance of the powder particles are improved, and the pressure needed for densification is reduced; and meanwhile, the density distribution uniformity of the formed pressing blanks can be improved, accordingly, residual stress of the powder pressing blanks is reduced, and the mechanical performance of the powder pressing blanks is improved. Meanwhile, the mechanical vibration action generated during spreading of ultrasonic waves in an oil medium, the ultrasonic cavitation effect, the heat actiongenerated due to sound wave absorption through the medium and the like are utilized, viscosity of the fluid medium can be obviously reduced, and the purpose of improving mobility of the fluid medium is achieved.

The invention relates to a plastic-wooden composite profile conditioning chamber which comprises a conditioning chamber, humidifying devices, a heating device and a ventilation device, wherein a compartment for containing a plastic-wooden composite profile is arranged at the front part of the conditioning chamber; an entrance is formed in the front side wall of the compartment; humidifying devices are arranged at the left and right sides of the compartment; the heating device comprises a microwave generator and a steam heater; the microwave generator is arranged at the rear part of the conditioning chamber; the steam heater and the ventilating device are arranged at the top of the conditioning chamber together. According to the plastic-wooden composite profile conditioning chamber, the plastic-wooden composite profile treated in the conditioning chamber is small in internal stress, high in size stability and wide in application scope; the plastic-wooden composite profile conditioning chamber is simple in structure and convenient to use; one conditioning chamber can contain plastic-wooden composite profiles produced by multiple plastic-wooden extrusion production lines; the existing extrusion production lines are completely reserved and the conditioning chamber has very good application prospect.

The invention discloses a preparation method of an ultrahigh-strength 7-series aluminum sheet. The ultrahigh-strength 7-series aluminum sheet comprises the following chemical components in percentage by mass: less than or equal to 0.20% of Si, less than or equal to 0.30% of Fe, 0.30-1.20% of Cu, 0.30-0.60% of Mn, 1.7-2.1% of Mg, 5.3-7.0% of Zn, 0.01-0.05% of Ti and the balance of aluminum and inevitable impurities, and the ultrahigh-strength 7-series aluminum sheet is prepared through semi-continuous casting, homogenizing heat treatment, surface milling, heating, hot rolling, cold rolling, solid solution quenching, artificial aging and the like. The thickness of the finished product ranges from 0.15 mm to 0.50 mm, the tensile strength is larger than or equal to 560 MPa, the yield strength is larger than or equal to 460 MPa, the ductility is larger than or equal to 10%, and the qualified product can be bent by 90 degrees (the radius R is smaller than or equal to 0.5 mm). The thin plate can be widely applied to backlight plates and structural parts of computers, mobile phones and display screens.

The invention discloses an additive for improving wear resistance of iron casting, which relates to the technical field of iron casting. The additive is prepared from the following ingredients: humicacid modifying graphene, cryolite, sodium alginate and ferromolybdenum. By adding the additive for improving the wear resistance of the iron casting according to a given mass ratio, the wear resistance of the iron casting can be effectively improved.

The invention provides a technological parameter optimization method for eliminating residual stress of a ring part through a cold rolling method. According to the initial residual stress distributionstate of a workpiece, based on the rolling mechanical and kinematic conditions of the ring part, the requirements of the ring part for the final size and mechanical performance are combined, and meanwhile, the capacity of ring part rolling technological equipment is considered, the residual stress elimination rate and distribution uniformity serve as control optimization targets, the allowable ranges of the reduction rate, the driving roller rotating speed, the friction coefficient, the core roller radius and the core roller feeding speed serve as constraint conditions, and the comprehensiveoptimization setting method for technological parameters for eliminating the residual stress of the ring part through the cold rolling method is provided. According to the method, the stress elimination effect can be systematically and comprehensively evaluated, the technological parameters are scientifically, efficiently and accurately formulated, cold rolling residual stress elimination treatment is carried out on the ring part in a targeted mode, the residual stress regulation and control effect is greatly improved, and the technical advantages of eliminating the residual stress of the ringpart through the cold rolling method are fully exerted.