134results about How to "Reduce internal stress" patented technology

The application relates to the technical field of zirconium-niobium alloy material processing, in particular to a preparation method of a large-diameter zirconium-niobium alloy pipe for nuclear industry, which comprises the following steps: S1, mixing nuclear-grade sponge zirconium and niobium scraps, or mixing zirconium-niobium alloy, zirconium dioxide and iron; melting the mixture and preparing a zirconium-niobium alloy ingot; S2, sequentially performing large deformation forging in a beta single-phase zone and an alpha+beta two-phase zone; S3, drilling a central hole in the axial direction of a round-forging blank; quenching in the beta single-phase zone; S4, coating an anti-galling agent on the surface of the central hole and heating to prepare a pipe blank in the mode of cross piercing; S5, performing periodic forging and rolling on the pipe blank; S6, annealing the hot-rolled pipe twice; and straightening the hot-rolled pipe after the second-stage annealing. The zirconium-niobium alloy pipe has uniform microstructure, good mechanical properties and corrosion resistance, the production direction of the brittle hydride is nearly parallel to the circumferential direction of the pipe, and brittle damage of the pipe wall thickness caused by the crack propagation of the hydride is avoided.

This utility model relates to the field of cooling equipment, specifically to a gear steel slow cooling device for improving the flaw detection pass rate. The device includes a frame located at the outlet of the crystallizer. Multiple cooling units are spaced apart on the frame. Each cooling unit includes four telescopic rods, adjacent rods being perpendicular to each other. Spray nozzles are connected to the ends of the telescopic rods, and each nozzle is connected to a flexible metal hose. A main water supply pipe is mounted on the frame, connected to a water supply unit. Multiple branch pipes are installed on the main water supply pipe, each corresponding to a cooling unit. Each branch pipe is equipped with an electrically controlled valve and connected to its corresponding flexible metal hose. Multiple infrared temperature sensors are spaced apart on the frame. This utility model regulates the cooling rate of the gear steel continuous casting billet, allowing for slow cooling, reducing internal stress, minimizing cracks, and improving the flaw detection pass rate.

This invention belongs to the field of spinning technology and relates to a coarse denier, low-pore polyester medium-oriented yarn and its production method. The production method involves extruding the melt from the spinneret's orifices, then sequentially passing through a windless zone, a transition zone, and a side-blown cooling zone. The windless zone and transition zone are the upper and lower sections of the same cylindrical component, respectively. Different spinnerets correspond to different cylindrical components, and the cylindrical components do not directly contact the spinnerets. The upper section of the cylindrical component has no through holes in its wall; the lower section has through holes on its wall to guide ambient air into the interior of the cylindrical component and prevent turbulence inside. The length of the windless zone is 5-6 cm, and the length of the transition zone is 6-10 cm. The percentage difference in wind speed between the side-blown cooling zones is no higher than 10%, where the percentage difference is calculated as (maximum wind speed - minimum wind speed) / maximum wind speed × 100%. This production method achieves uniform cooling of the inner and outer layers, resulting in coarse denier, low-pore polyester medium-oriented yarn with advantages such as high breaking elongation.

The application belongs to the technical field of putty, and particularly relates to a high-temperature-resistant CHPO curing putty with good polishing performance and a preparation method thereof. The high-temperature-resistant CHPO curing putty with good polishing performance comprises an A component and a B component. The A component comprises the following raw materials in parts by weight: linseed oil modified unsaturated polyester resin 140-160 parts, oleic acid modified air-drying unsaturated polyester resin 40-60 parts, dicyclopentadiene modified unsaturated polyester resin 90-110 parts, styrene 30-40 parts, drier 5-8 parts, accelerator 0.1-1.2 parts, dispersant 3-5 parts, thixotropic agent 8-12 parts, titanium white powder 12-16 parts, talc powder 400-500 parts, and pre-expanded polymer microspheres 5-10 parts. The application effectively solves the problems of poor polishing performance, poor adhesion to water-based epoxy primer and poor high-temperature resistance of traditional CHPO curing putty.

This application relates to the field of battery technology, providing an electrode sheet and a battery cell. The electrode sheet includes a current collector and a tab. The current collector is the main component of the tab, and the tab is connected to the current collector. The tab can be connected to an external structure to conduct electricity. Both the tab and the current collector are thin sheet structures. When the electrode sheet passes through a conveyor roller and the moving direction of the electrode sheet switches between horizontal and vertical directions, the tab will bend along the arc-shaped surface of the conveyor roller. The tab separator groove can divide the tab into at least two parts, which can reduce the internal stress of the tab during bending deformation and prevent the tab from tearing when bending and deforming through the conveyor roller. This can result in a higher yield rate during the preparation of the electrode sheet of this application and reduce the preparation cost of the electrode sheet.

This invention relates to a method for preparing high-performance aluminum alloy radiator plates. The method involves controlling the iron-silicon ratio of the main impurity component in the melt to be no less than 1.9 to reduce internal cracks in the cast billet and decrease the machining deformation rate of the finished product. This is achieved by adding aluminum-titanium alloy and a grain refiner in the furnace and online runner, while ensuring that the titanium content in the aluminum alloy ingot is maintained within a reasonable range, resulting in an ingot grain size ≤1. This improves the mechanical properties, uniform microstructure, and refined grains of the aluminum alloy radiator plate. Simultaneously, a small amount of copper is added, and the final rolling temperature is controlled at 330-360℃, resulting in fully recrystallized grains within the aluminum alloy plate. This improves the strength of the aluminum alloy radiator plate while eliminating anisotropy in its internal mechanical properties and reducing internal stress, ultimately yielding a high-performance aluminum alloy radiator plate.

The application discloses a metal mask plate and a manufacturing method of the metal mask plate, and the metal mask plate is used for evaporating and depositing an organic light-emitting layer of an OLED device. The metal mask plate comprises a mask plate body, a plurality of mask holes are formed on the mask plate body, the mask plate body comprises a first surface and a second surface which are opposite to each other, the mask holes penetrate through the first surface and the second surface, the mask holes form first openings on the first surface, the mask holes form second openings on the second surface, and the ratio of the aperture of the first opening to the aperture of the second opening is between 1 and 1.5. The metal mask plate has the characteristics of high tensile strength and high resolution.

This invention discloses a concrete mix design and manufacturing method for underground engineering concrete in a coupled environment of underground environment and load, relating to the field of underground engineering concrete technology. It aims to address the problem that traditional concrete mix design does not fully consider the coupling effect of underground environment and load. The underground environment includes groundwater erosion, wet-dry cycle, and temperature fluctuation; the load includes stress ratio. α s Dynamic load frequency and dynamic load amplitude α d This leads to technical problems such as insufficient erosion resistance, crack resistance, and mechanical stability of concrete, resulting in a short service life. This mix design is based on quantitative analysis of coupled environmental parameters. With cement, composite admixtures, recycled aggregates, modifiers, water, and additives as core components, the basic mix proportion is determined through a mapping model between "environment-load" coupled parameters and component content. The target mix proportion is then obtained through orthogonal experimental optimization. The manufacturing method includes four core steps: raw material pretreatment, graded mixing, gradient curing, and coupled environmental simulation curing.

The utility model provides shaping and segmenting equipment for a metal carrier tape, and relates to the technical field of carrier tape production equipment, and the shaping and segmenting equipment comprises an unwinding and feeding assembly, a segmenting track, and a shaping assembly and a cutting assembly which are sequentially arranged in the conveying direction of the segmenting track. The unwinding and feeding assembly comprises a feeding support, an unwinding disc and a winding disc are vertically installed on the feeding support, and the segmented track is arranged between the unwinding disc and the winding disc and used for bearing the metal carrier tape unwound from the unwinding disc. And a displacement driving assembly for driving the metal carrier tape to move along the segmented track is arranged on the segmented track. The shaping assembly comprises a shaping lower die arranged on the segmented track and a shaping upper die arranged above the shaping lower die, and the shaping upper die is connected with a first stamping driving mechanism. The cutting assembly comprises a second stamping driving mechanism and is used for cutting the metal carrier tape shaped by the shaping assembly into segments. The metal carrier tape can be stamped and shaped, internal stress is reduced, and the risk of buckling deformation of the metal carrier tape is reduced.

The utility model discloses a gradient cooling system for injection molding, which belongs to the technical field of cooling equipment and comprises a forming die, a cooling-water machine and a mixing box, the forming die is provided with a quick cooling channel and a slow cooling channel, a cooling water outlet of the cooling-water machine is provided with a main water inlet pipeline, and the main water inlet pipeline is communicated with the quick cooling channel through a first branch water inlet pipeline. The main water inlet pipeline is communicated with the slow cooling channel through a second branch water inlet pipeline, a main water return pipeline is arranged at a water return port of the cooling-water machine, the main water return pipeline is communicated with the rapid cooling channel through a first branch water return pipeline, and the main water return pipeline is communicated with the slow cooling channel through a second branch water return pipeline. The mixing box is further communicated with the first branch water return pipeline through a second mixing water inlet pipeline, the mixing box is communicated with the second branch water inlet pipeline through a mixing water outlet pipeline, and a water pump is arranged on the pipeline. And due to the partition cooling design, product deformation is effectively reduced, heat energy is utilized, and energy consumption is reduced.

This invention discloses a modification method for nanocrystalline magnetic core encapsulation materials. The method includes: S1: surface functionalization modification of nano-silica and boron nitride nanosheets by grafting amino and epoxy groups, respectively; S2: blending and dispersing the modified inorganic nanofiller with low-viscosity bisphenol A type epoxy resin, flexible epoxy resin diluent, latent curing agent, and coupling agent under high shear force to form a uniform and stable modified epoxy resin composition; S3: plasma cleaning and activation treatment of the nanocrystalline magnetic core; S4: encapsulating the modified epoxy resin composition on the surface of the magnetic core using a vacuum pressure impregnation process, followed by programmed temperature curing. This invention significantly improves the mechanical strength, thermal conductivity, and heat resistance of the encapsulation layer and reduces the high-frequency dielectric constant and loss by constructing an organic-inorganic interpenetrating network and interface reinforcement.

This invention discloses a microtexturing treatment and lamination process for the copper foil surface of a low-thermal-expansion high-frequency copper-clad laminate (CCL). Belonging to the field of CCL manufacturing technology, it solves problems in existing CCL technologies, such as the difficulty in balancing peel strength and high-frequency transmission performance, excessively high coefficient of thermal expansion, easy delamination between layers, and patent conflicts. This invention employs a combined plasma etching and chemical micro-etching process to prepare a honeycomb-like pit-column-protrusion composite microtexture on the resin-coated surface of the substrate copper foil. After modification with a fluorine-containing and aminosilane coupling agent and mixed passivation treatment, a surface-modified copper foil is obtained. This foil is then laminated with a low-thermal-expansion high-frequency prepreg containing linear polyarylamide through a segmented preheating, gradual pressure curing, and slow cooling and depressurization process to prepare the CCL. This invention features a simple process, conforms to industrial practice, exhibits excellent overall performance, effectively avoids patent conflicts, and is suitable for high-end fields such as 5G communication and AI servers.

The application discloses a kind of high-efficiency super-soft organic solar cell of top incidence structure, it includes flexible substrate, anode, anode modification layer, active layer, cathode modification layer, cathode and antireflection layer from bottom to top, wherein the cathode is based on the transparent electrode of ultrathin silver.Especially by preferred cathode modification layer and introducing not more than 2nm thick gold as seed layer, make ultrathin silver surface more smooth and uniform, the transparent electrode can further improve the photoelectric energy conversion efficiency (PCE) of organic solar cell.Meanwhile, using the wide adaptability of top incidence structure to different substrates, the organic solar cell can also achieve comparable PCE (17.32%) with mm level rigid glass substrate on the polyimide flexible substrate with thickness of only 1.3 μm.Therefore, the highest efficiency of super-soft organic solar cell so far is obtained, and the highest power density (39.72W g ‑1 ) in all photovoltaic technologies at present is also obtained.

This utility model relates to the field of bamboo processing technology, and provides a device for processing curved bamboo strips. The device includes a preliminary processing component, a fine processing component, and a thickness-fixing component arranged sequentially along the bamboo strip's travel direction. The preliminary processing component removes bamboo nodes and then sequentially cuts multiple irregular wavy lines into the yellow surface of the curved bamboo strip in different areas to change the curvature of the strip. The fine processing component repeatedly cuts the yellow and green surfaces of the curved bamboo strip, and continues to cut wavy lines across the entire yellow surface to further change the curvature. The thickness-fixing component cuts and flattens the yellow surface of the curved bamboo strip processed by the fine processing component, and cuts the strip to a predetermined thickness. This utility model solves the defects of high energy consumption, high processing costs, and poor dimensional stability in existing technologies, enabling the processing of curved bamboo strips at room temperature, producing irregular wavy lines on the surface to directionally change the curvature, thereby improving production efficiency, saving costs, and improving product dimensional stability.

The invention belongs to the technical field of casting, and provides an investment casting process of a martensitic stainless steel material part, according to the investment casting process of the martensitic stainless steel material part, through introduction of silicon carbide and metamorphism of a rare earth ferrosilicon alloy, the thermal expansion coefficient of steel is reduced, and the performance of the martensitic stainless steel part is improved. And meanwhile, structure grains in the martensitic stainless steel solidification process are remarkably refined, formation of thick and large matrix structures is reduced, and therefore internal stress generated in the casting solidification stage is reduced. And meanwhile, the plasticity and toughness of the material can be improved through the refined crystal grains, the adaptive capacity of the casting to martensite transformation volume change in the subsequent heat treatment process is enhanced, accumulation of internal stress is relieved, and finally cracks are effectively restrained. Compared with existing schemes such as casting temperature optimization and shell deformability adjustment, the process improves the material performance from the structure level through modification treatment, the anti-cracking capacity of the casting can be fundamentally improved, meanwhile, the size precision and the mechanical property of the casting are considered, and the bottleneck of the prior art is broken through.

The present application relates to a kind of 900MPa level magnetic yoke steel plate and its preparation method, wherein the preparation method includes rolling blank into steel strip, and the rolling temperature of final rolling is 820~900 ℃;Two-stage cooling process is used to cool the steel strip after final rolling, wherein, the first stage cooling is to cool the steel strip after final rolling to intermediate temperature 650~750 ℃ according to the cooling speed of 20~40 ℃ / S, the second stage cooling is to cool the steel strip to 250~350 ℃ according to the cooling speed of 90~110 ℃ / S;And the steel strip cooled to 250~350 ℃ is treated to obtain 900MPa level magnetic yoke steel plate.The microstructure of the magnetic yoke steel plate prepared by the present application is two-phase structure of ferrite and martensite, and the strength and toughness are better matched;The magnetic yoke steel plate prepared by the present application has good magnetism.

This application relates to the field of engineered wood panel manufacturing technology, and discloses a flexible, shapeable technological board and its preparation method. The technological board comprises two layers of reconstituted decorative veneers and a modified polyolefin adhesive film layer located between them. The adhesive film layer is made of metallocene propylene-based elastomer, polyolefin elastomer, maleic anhydride-grafted polyolefin initiator, crosslinking aid, and silane coupling agent. The preparation method includes: coating the surface of resin particles with liquid-phase additives, and obtaining an adhesive film with latent reactive activity through low-temperature extrusion casting; stacking the veneers and adhesive film layers, initiating crosslinking reaction and interfacial bonding through high-temperature hot pressing, and then holding the pressure and cooling for shaping. This invention solves the problems of high formaldehyde content and brittleness of traditional adhesives and poor heat resistance of ordinary thermoplastic films. The resulting board has excellent flexibility, heat creep resistance, and water-resistant bonding strength, meeting the requirements for irregular curved surface shaping.

The invention relates to the technical field of composite electroplating, in particular to an electroplating method for preparing a high-wear-resistance self-lubricating plating layer, which comprises the following steps: firstly, carrying out pretreatment of oil removal and acid pickling activation on a metal workpiece; then preparing a nano composite nickel plating solution in which a nickel plating basic solution contains a nano particle composite phase subjected to pre-dispersion treatment, and the total concentration of composite particles is 10-60g / L; then the dispersion stability of the nano-composite nickel plating solution is maintained in a circulating filtration and mechanical stirring combined mode, and the pretreated workpiece is electroplated; and finally, after electroplating is completed, the workpiece is cleaned and dried. According to the electroplating process for preparing the nickel-based composite coating with high wear resistance and low friction coefficient, the pulse current is adopted, and the high instantaneous current density and turn-off time of the pulse current are utilized, so that desorption and rearrangement of adsorbed particles are facilitated, uniform embedding of the particles is promoted, nickel matrix crystal grains are refined, and the compactness and comprehensive mechanical properties of the coating are further optimized.

The embodiment of the invention provides a preparation method of a carrier plate structure, the carrier plate structure and a mobile terminal. The preparation method of the support plate structure comprises the following steps: forming an accommodating hole in a temporary support plate, wherein the accommodating hole is arranged in a penetrating manner along the thickness direction of the temporary support plate; embedding the substrate into the accommodating hole, and temporarily bonding the side surface, facing the hole wall of the accommodating hole, of the substrate with the hole wall of the accommodating hole; patterning the substrate to form a through hole penetrating through the thickness direction of the substrate; preparing conductive columns in the through holes; a layer-adding assembly is prepared on at least one side of the substrate in the thickness direction of the substrate, the layer-adding assembly comprises a conductive part, and the conductive part is electrically connected with the conductive column; and de-bonding the side surface, facing the hole wall of the accommodating hole, of the substrate with the hole wall of the accommodating hole, and taking out the substrate from the accommodating hole. According to the embodiment of the invention, the yield of the carrier plate structure can be improved.

This invention relates to a Cr and Br dual-element doped polyanionic sodium-ion battery cathode material, sodium iron phosphate pyrophosphate, its preparation method, and its application, belonging to the field of sodium-ion battery technology. The general chemical formula of the cathode material of this invention is: Na₄Fe₂O₃. 3‑x Cr x (PO4)2P2O7Br y Where 0 < x < 0.5, 0 < y < 0.7; the precursor wet gel is obtained through a sol-gel process, dried, and then sintered. This invention relates to a Cr- and Br-doped polyanionic sodium-ion battery cathode material, sodium iron phosphate pyrophosphate. The Cr dopant enhances bulk stability, while the gradient distribution of Br forms a fast ion conduction layer on the surface. The two elements together improve the rate capability and cycle performance of the sodium-ion battery. This provides a modification strategy of significant reference value for cathode materials that suffer from low discharge specific capacity and poor cycle performance at high rates due to electron conductance differences.

The application provides a UV white ink and a preparation method thereof. The preparation raw materials of the UV white ink include, in parts by weight, 3-15 parts of silicone-modified acrylate prepolymer, 30-90 parts of monofunctional monomer, 1-10 parts of bifunctional monomer, 3-10 parts of photoinitiator, 1-15 parts of titanium white, 0.1-5 parts of dispersant and 0.1-5 parts of auxiliary agent. The silicone-modified acrylate prepolymer is used to improve the flexibility, smoothness and water resistance of the ink layer, and the specific functional monomer compound system is used to inhibit the curing shrinkage and enhance the adhesion, so that the UV white ink with excellent comprehensive performance is obtained, and is suitable for the inkjet printing of silica gel labels.

This utility model provides a wheel hub mold with a cooling function, belonging to the technical field of wheel hub mold equipment. The technical solution of the wheel hub mold with cooling function includes an upper mold body, a lower mold body, and a side mold body. The side mold body has a first cooling water channel and a second cooling water channel. The first cooling water channel has an inlet and an outlet. One end of the second cooling water channel is connected to the first cooling water channel, and the other end of the second cooling water channel is connected to a water channel adjustment mechanism. The water channel adjustment mechanism has a telescopic plug, which is movably connected within the second cooling water channel. The telescopic plug can extend and retract to adjust the effective cooling length of the second cooling water channel. This utility model, by setting a telescopic plug on the second cooling water channel, allows for flexible and precise adjustment of the effective cooling length of the second cooling water channel through the extension and retraction of the plug, thus improving the versatility and production efficiency of the mold.

The utility model relates to the technical field of printing adjustable anti-curling devices, in particular to a printing adjustable anti-curling device which comprises a printing device, a guide roller B and a guide roller A are installed on the inner side of the printing device, and an anti-curling accessory is movably installed at the position, close to the guide roller A, of the inner side of the frame end of the printing device. The anti-rolling accessory comprises two movable rods rotationally installed on the inner side of the frame end of the printing equipment, inner inserting shafts are movably installed at the bottom ends of the two movable rods through guide grooves, smoothing rollers are rotationally installed at the bottom ends of the inner sides of the inner inserting shafts, and adjusting accessories are arranged at the positions, close to the transverse shaft ends of the movable rods, of the outer side of the frame end of the printing equipment. By arranging the anti-curl accessory, anti-curl operation on printing paper is achieved, the movable rod rotates to be matched with the inner inserting shaft to drive the smoothing roller to rotate, so that the distance between the smoothing roller and the guide pipe A is changed, downward pressure is applied to the paper through the smoothing roller, and the anti-curl device is suitable for the paper of different thicknesses and materials.

The invention discloses a polyurethane emulsion for UV (ultraviolet) ink-jet digital printing as well as a preparation method and application of the polyurethane emulsion. The preparation method of the polyether type polyurethane emulsion comprises the following steps: adding polyether polyol, isocyanate, a catalyst and polyfunctional group acrylate into an organic solvent, mixing and uniformly stirring, heating to a first temperature, and stirring for reaction to obtain a polyether type polyurethane solution; and cooling to a second temperature, sequentially adding deionized water, adjusting the pH value, and uniformly mixing to obtain the water-based polyether polyurethane emulsion. The low-polarity polyether polyurethane is selected as a main body material, the polyfunctional group acrylate is introduced to increase the binding force between the ink and the main body, the compatibility among the components can be improved, the leveling property of the UV ink can be improved, a high-quality cured film layer can be formed without additionally adding a leveling agent, the internal stress during UV curing film forming is reduced, and the UV curing film forming quality is improved. Therefore, surface defects such as white points and pinholes caused by shrinkage of film holes in the UV curing process are avoided.

This utility model discloses a plastic pipe clamp injection mold, belonging to the field of injection mold technology, including a static injection mold: a static mold panel, a static mold base plate, and a static mold plate; and a moving injection mold: a moving mold base plate, a moving mold foot, a moving mold base plate, a moving mold plate, a bottom pin plate, a top pin plate, a demolding ejector pin, and a demolding ejector block. This utility model, through the mirror-symmetrical static and moving mold plates, can injection mold multiple plastic pipe clamps at once, significantly improving production efficiency and meeting the needs of mass production. Smooth demolding effectively avoids product damage during demolding, improving product qualification rate. The circulating water channel design within the static and moving mold plates ensures uniform heat dissipation during the cooling process of the injection molded parts, reducing the generation of internal stress and improving the mechanical properties and service life of the products. This utility model has advantages such as high-efficiency production, convenient demolding, uniform cooling, and high mold closing accuracy, which can significantly improve the production efficiency and quality of plastic pipe clamps and has broad application prospects.

The present application relates to the technical field of film processing, and particularly relates to a temperature control strong attachment flow line for car film production and a composite process thereof. The present application aims to provide a temperature control strong attachment flow line for car film production and a composite process thereof, which integrates electrostatic auxiliary lamination, gradient heat pressing and gradient cooling, effectively eliminates bubbles, reduces internal stress, and realizes high-quality composite between film layers. The temperature control strong attachment flow line for car film production comprises a feeding device for synchronously releasing at least two film substrates to be laminated; a pre-lamination device arranged downstream of the feeding device and used for preliminarily laminating the at least two film substrates; and the pre-lamination device comprises an electrostatic auxiliary lamination unit and a mechanical extrusion lamination unit. The present application achieves the effect of integrating electrostatic auxiliary lamination, gradient heat pressing and gradient cooling, effectively eliminating bubbles, reducing internal stress, and realizing high-quality composite between film layers.

The application belongs to the technical field of magnetic material preparation, and relates to an electromagnetic mixing device and a method for mixing magnetic material powder by using the same. The electromagnetic mixing device comprises, from top to bottom, a feeding assembly, an electromagnetic mixing assembly and a demagnetization and screening assembly which are sequentially connected. The feeding assembly comprises a feeding inlet and a feeding pipe which are connected in a top-down manner. The electromagnetic mixing assembly comprises a stirring chamber and an electromagnetic stirrer. The demagnetization and screening assembly comprises a vibrating screen, a coarse particle outlet, a discharge outlet and a vibrating motor. The electromagnetic mixing device and the electromagnetic mixing method can realize more uniform, rapid and efficient mixing of magnetic material powder.

The utility model relates to the technical field of concrete anti-cracking, in particular to a floor mass concrete anti-cracking structure which comprises a concrete filling material main body, and the concrete filling material main body is filled with an anti-cracking structure. According to the floor mass concrete anti-cracking structure, a reasonable layered pouring method is adopted, that is, a construction method of layered pouring, layered vibration, one inclined plane, continuous flexible pouring and one-time top reaching is adopted for flexible pouring of concrete, the thickness of each layer is controlled within 400 mm, each layer is staggered by about 5 m, the gradient of the inclined plane is 1: 6, all pouring layers are staggered front and back, and flexible pouring is carried out in a layered mode. The upper layer is connected before the lower layer is initially set, the combination and quality of the upper layer and the lower layer of the concrete are ensured, the surface of the uppermost layer of concrete is rolled by an iron roller before the initial set, the surface compactness is enhanced, and the concrete is flattened by a wood trowel for not less than three times after water is collected, so that early plastic shrinkage cracks on the surface layer of the concrete are eliminated.

The invention belongs to the field of hard coatings, and particularly relates to an ice skate blade TiN composite coating and a preparation method thereof.The ice skate blade TiN composite coating comprises a titanium bottoming layer, a heat conduction regulation and control layer and an ice scrap repelling layer which are sequentially arranged from inside to outside; the heat conduction regulation and control layer is of a columnar crystal TiN structure doped with rare earth elements and has the following characteristics that when the interface temperature is larger than or equal to-25 DEG C and smaller than 0 DEG C, the heat conductivity ranges from 3 W / mK to 8 W / mK; when the interface temperature is greater than or equal to 0 DEG C and the shear stress is less than 1.0 GPa, the columnar crystal maintains the initial orientation, and the thermal conductivity is 8-12W / mK; when the interface temperature is greater than or equal to 0 DEG C and the shear stress is 1.0-2.0 GPa, the columnar crystal is subjected to orientation rearrangement under the action of shear force, and the thermal conductivity is 22-30W / mK. The heat conduction regulation and control layer can rapidly generate a water film at low temperature and rapidly dissipate heat at high temperature and high shear force, so that the water film is prevented from being too thick. The ice scrap repelling layer can actively promote the ice scraps to be quickly separated from the ice skate blade, and the abrasive paper effect generated by ice scrap accumulation is avoided.

A method and apparatus for quenching bar stock includes: heating the bar stock to austenitize it; immersing the bar stock in a first region of a quenching liquid and driving it to perform step-quenching within that first region; when the temperature of the bar stock at a distance of 1 / 4 radius from the surface cools to the martensitic transformation initiation temperature, transferring the bar stock from the first region to a second region of the quenching liquid, wherein the quenching intensity of the second region is lower than that of the first region, and driving it to perform step-quenching within that second region; and when the temperature of the bar stock drops to the martensitic transformation completion temperature, removing it from the quenching liquid. This method allows the bar stock to rotate during quenching and reduces the quenching intensity after a period of cooling, thereby improving hardenability during cooling, enhancing the uniformity of properties such as hardness, and reducing deformation.