24results about How to "Increase internal stress" patented technology

The invention provides a preparation method of an aluminum electrolytic capacitor anode foil, and relates to the technical field of capacitors. The method comprises the following steps: preparing aluminum paste; providing an aluminum foil substrate, coating the surface of the aluminum foil substrate with aluminum paste, and performing drying treatment to form an aluminum foil blank; washing the aluminum foil green body with water, and drying to obtain a porous aluminum foil green body; performing heat treatment on the porous aluminum foil blank; coating the surface of the porous aluminum foil green body subjected to heat treatment with a thin film solution, and performing drying treatment to form a protective film layer on the surface of the porous aluminum foil green body; rolling the porous aluminum foil blank with the protective film layer by using a rolling mill in a skew rolling manner to obtain an initial anode foil; and sintering the initial anode foil, and removing the protective film layer to form a sintered foil. According to the preparation method, the anti-bending performance of the anode foil can be improved.

The invention provides a preparation method of an antireflection film of a semiconductor laser, and belongs to the technical field of semiconductor lasers. The problem that a film layer falls off in an existing anti-reflection film preparation process is solved. Comprising the following steps: pretreatment cleaning before bar coating: vacuumizing a chamber of reaction magnetic control equipment to a vacuum degree of 10 <-6 > Torr grade, turning on a heating lamp to heat the chamber to a set temperature, starting an ion source, introducing a proper amount of plasma gas into the ion source, introducing a proper amount of plasma gas into the chamber to enable the vacuum degree of the chamber to reach a 10 <-3 > Torr grade, and then cleaning; in the process steps of plating the silicon nitride thin film and the aluminum oxide thin film, a chamber is kept at a certain temperature, and then the vacuum degree of the chamber is reduced during film plating; and the performance of the laser is stably improved while the production yield of the semiconductor laser is improved.

The present invention discloses a glass powder for NP0 ceramic MLCC and a preparation method thereof, a conductive copper paste and a sintering process. The glass powder raw materials for NP0 ceramic MLCC include: a basic glass component and an externally doped component; wherein the basic glass component is BaO-ZnO-B2O3 system glass, and the externally doped component is MnO2, CaO and ZrO2. The glass powder has a low glass softening temperature T f , a wider ΔT and a higher flow temperature FT, and at the same time, it has a relatively low wetting angle with NP0 ceramics, good wettability and adhesion. The conductive copper paste prepared by the glass powder, copper powder and organic carrier, combined with the copper terminal electrode prepared by the three-stage sintering process of the present invention, has excellent density and no nickel penetration. The internal stress of the MLCC product is small and moderate, the terminal tensile force is large, and the reliability test pass rate such as solder resistance and non-destructiveness is high.

The invention discloses a non-crosslinked polyethylene insulated medium-voltage flame-retardant power cable, and relates to the technical field of cables. The non-crosslinked polyethylene insulated medium-voltage flame-retardant power cable comprises a plurality of insulated wire cores which are arranged together in a pairwise tangent manner, a wrapping layer wrapping the outer sides of the plurality of insulated wire cores, an isolation sleeve wrapping the outer side of the wrapping layer, an armor layer wrapping the outer side of the isolation sleeve, and an outer sheath layer wrapping the outer side of the armor layer, the filling layers are filled among the plurality of insulating wire cores and between the plurality of wire cores and the wrapping layer; each insulating wire core sequentially comprises a conductor, a conductor shielding layer, a non-crosslinked polyethylene insulating layer, an insulating shielding layer and a metal shielding layer from inside to outside.

The invention provides a crucible for growing indium phosphide crystals, which comprises a carrier crucible and a diamond coating layer / coating body, the diamond coating layer / coating body is arranged on the inner surface of the carrier crucible, the material of the carrier crucible is any one of graphite, quartz, silicon carbide or boron nitride, and the diamond coating layer / coating body is arranged on the inner surface of the carrier crucible. The thickness d of the diamond coating layer or the diamond coating layer arranged on the surface of the diamond coating body is not less than 0.5 [mu] m and not more than 100 [mu] m, placing an indium phosphide polycrystal material in the crucible, then placing the crucible in a high-pressure reaction kettle, setting process parameters, and carrying out single crystal growth, the problems that in the prior art, indium phosphide crystals obtained through growth are large in internal stress and many in dislocation, and crystal lattices are prone to distortion are solved.

The present invention relates to a cold heading forming process for a stud, and in particular to a copper alloy stud for a new energy DC motor guide and a cold heading forming process thereof. The present invention significantly improves the wear resistance, fatigue resistance and forming accuracy of the stud by adding trace elements such as yttrium, lanthanum, magnesium, titanium, zirconium, boron, etc. to an aluminum bronze matrix material, and by adding nano-tungsten carbide and nano-alumina particles, combined with double-step heat treatment and segmented multi-step cold heading forming, thereby meeting the high performance requirements of new energy DC motors for studs.

The utility model discloses a double-channel grading sealing gasket structure of a pipeline repairing device, which relates to the technical field of pipeline repairing devices and comprises an upper shell of the pipeline repairing device, a lower shell of the pipeline repairing device and two groups of sealing gaskets, and the two groups of sealing gaskets are respectively arranged on the inner walls of the upper shell and the lower shell; the sealing gasket comprises two gasket body straight edge sections, two outer arc edge sections and two inner arc edge sections, the two outer arc edge sections and the two inner arc edge sections are connected between the two gasket body straight edge sections, the two outer arc edge sections are arranged at the two ends of the two gasket body straight edge sections, and the two inner arc edge sections are arranged on the inner sides of the two outer arc edge sections and do not make contact with the outer arc edge sections. The inner ring radius of the inner arc edge section is larger than the inner ring radius of the outer arc edge section, when the pipe diameter of the pipeline has negative tolerance, sealing can be achieved through the outer arc edge section, when the pipe diameter of the pipeline is standard, the outer arc edge section is excessively compressed, the inner arc edge section is normally compressed, and the overall internal stress of the outer arc edge section and the inner arc edge section is improved. The sealing performance of the sealing gasket can be prevented from being sharply reduced, and the service life is prolonged.

The utility model relates to the technical field of medical instruments, and discloses an elderly femoral intertrochanteric fracture customized joint which comprises a bone near end, a fixing hole is formed in the surface of the bone near end, and a fixing ring, a positioning plate, a stress belt and a positioning hole are arranged in the fixing hole. The femoral prosthesis is reasonable in structure, the 3D printing femoral prosthesis, the fixing ring and the bolt ring at the proximal femur can be replaced in various models and sizes according to parameters of a patient, the proximal femur can be customized for the thickness and strength prosthesis of a bone trabecula according to the weight of the patient, and the distal and proximal femur can be positioned through the butt joint ring arranged on the lower surface of the proximal femur. The phenomenon that the distal femur fixed by a thread structure is loosened due to movement of a patient is avoided, effective bony support can be provided for a proximal femur fracture block through the design of the proximal femur individualized 3D printing bone trabecula, bony mechanical stability is achieved in the early stage, bone ingrowth is facilitated in the long term, proximal femur biological fixation is achieved, bony structure support is facilitated, and bone fracture is prevented. The gluteus medius efficiency and the ideal force arm are recovered.

The invention belongs to the technical field of automobile part mold surface enhancement, and particularly relates to a plasma immersion ion implantation method suitable for a mold coating, which comprises the following steps of: dynamically adjusting gas flow through a gas flow control module according to a vacuum degree requirement; an output result of the sputtering power optimization algorithm is input into the working temperature setting model; output data of the working temperature setting model are transmitted to the ion energy control system; output data and surface cleaning demand data of the ion energy control system are used for argon ion bombardment parameter optimization; output data and surface state data of the argon ion bombardment parameter optimization module are transmitted to a hydrogen etching process control system; and the output data of the hydrogen etching process control system is input into the composite film layer structure design module to realize the designed composite film layer structure. According to the invention, by introducing an immersion ion implantation technology, dynamic regulation and control of key parameters such as gas flow, sputtering power, working temperature and ion energy are realized.

The present invention discloses an anvil, comprising a seat body and a cutting groove provided in the middle of the seat body, wherein the upper surface of the seat body is provided with raised parts, the raised parts are located on both sides of the cutting groove, and the surfaces of the raised parts are higher than the surface of the seat body; the raised parts are provided with a plurality of anti-slip parts, the anti-slip parts include a first anti-slip part and a second anti-slip part connected to the first anti-slip part, and the first anti-slip part and the second anti-slip part are both inclinedly arranged. The present invention can reduce the sliding between the tissue and the anvil, and improve the anastomosis effect.

The invention discloses a low-internal stress SiC crystal and a SiC substrate, and belongs to the technical field of SiC material preparation. A plurality of SiC substrates are prepared from the SiC crystal, high-pass signals and low-pass signals are distinguished on the basis of the Laplacian pyramid principle, and the optical path difference of any SiC substrate is lt under the low-pass signals; 6 nm, the maximum value of the optical path difference is lt; 10 nm, and the standard deviation of the optical path difference is lt; 2 nm. The optical path difference between the SiC crystal and the SiC substrate is small and uniform under a low pass signal, which represents that the internal stress in SiC is low, and the lattice distortion degree caused by the internal stress is small.

The invention provides a composite fabric. The composite fabric comprises a base material layer and a polymer printing and / or polymer layer compounded on at least one surface of the base material layer, the polymer printing and / or the polymer layer comprises a humidity response polymer; the humidity response polymer is selected from polyether type polyurethane and / or polyether type thermoplastic polyurethane elastomer. Compared with the prior art, the adopted humidity response polymer has high hydrophilicity, after water / water vapor is absorbed, macromolecular chain segments of the humidity response polymer can stretch, change and swell, so that large internal stress can be generated, the moisture absorption function is achieved, after the polymer is dried, the molecular chain segments can be recovered, fabric deformation is recovered, and the moisture absorption effect is good. Therefore, the intelligent breathable function effect is achieved, the composite fabric compounded with the humidity response polymer has intelligence, the comfort requirement of people in the dry state and the wet state can be met, the moisture absorption function does not depend on moisture absorption chemical reagents, and the composite fabric has wear resistance and washability.

The utility model discloses a thermal expansion and cold contraction compensation device for a steel plate silo, which belongs to the technical field of steel plate silos and comprises a mounting seat, a silo body arranged on the mounting seat, a plurality of connecting blocks fixedly connected onto the mounting seat, motors arranged inside the connecting blocks, lead screws connected onto transmission ends of the motors and rotatably connected inside the connecting blocks. A guide rod is slidably connected into the connecting block, extends into the placement base and is connected with a limiting block. The motor, the lead screw, the guide rod and the limiting block are arranged, the motor can be powered on according to actual conditions, the motor drives the lead screw to rotate together and then drives the guide rod to move back and forth, and the guide rod drives the limiting block to move together until the limiting assembly just abuts against the outer wall of the bin body. Therefore, when the bin body expands with heat and contracts with cold due to temperature, the limiting assemblies on the outer side of the bin body can synchronously move and always limit and abut against the bin body, large internal stress generated due to limitation of a bin body steel plate is reduced, and deformation of the bin body is avoided.

The application provides a high-hardness low-friction diamond-like carbon coating piston ring and a preparation method thereof, and relates to the technical field of piston rings. The high-hardness low-friction diamond-like carbon coating piston ring comprises a base material, a primer layer, a transition layer and a DLC layer. The primer layer is a metal layer or a metal nitride layer, the transition layer is a diamond-like carbon layer containing a doping element, and the DLC layer is a pure diamond-like carbon layer. The piston ring provided by the application has good initial running-in effect, protects the parts, reduces fuel consumption and oil consumption, and has no peeling and stripping phenomenon on the surface coating after a heat stability test, and is more suitable for high-blast-pressure high-temperature engines and gas machines with poor lubrication conditions.

The invention belongs to the technical field of metal processing, and discloses a wind power jacket steel round pipe auxiliary welding device which comprises a metal pipe, mounting bases are symmetrically and fixedly arranged on the upper side and the lower side of the metal pipe, a plurality of guide grooves are fixedly formed in the circumference of the upper surface of each mounting base at equal intervals, and the middles of the guide grooves are slidably sleeved with pressing blocks; the pressing block moves in the horizontal direction. The end, away from the metal pipe, of the pressing handle is pressed downwards, the pressing block drives the multiple reinforcing plates to synchronously move in the direction of the metal pipe, meanwhile, the center lines of the multiple reinforcing plates are kept unchanged, and the reinforcing plates conduct center alignment on the bent and inclined portions of the upper portion, needing to-be-welded gaps, of the metal pipe and the lower portion, needing to-be-welded gaps, of the metal pipe. Therefore, the problems that a metal pipe welded by an existing welding device is still kept in a bent and inclined state, consequently, the metal pipe is prone to being broken off continuously in the later period, water adheres to the surface of the metal pipe, and air holes or cracks are generated at the welding position are solved.

The invention discloses a packaging structure and method of an image sensor, and belongs to the technical field of semiconductor packaging. The packaging structure comprises a sensor wafer, a light-transmitting cover plate, a retaining wall, a packaging layer, a rewiring layer, a silicon through hole and a solder ball. The encapsulating layer wraps the side wall of the light-transmitting cover plate, the side wall of the retaining wall and the side wall of the chip, the upper surface of the encapsulating layer is flush with or slightly lower than the upper surface of the light-transmitting cover plate, and a low-moisture-absorption-rate material is adopted to prevent water vapor from invading the cavity and enhance the mechanical strength. The packaging method mainly comprises the following steps: manufacturing a retaining wall on a cover plate wafer; bonding with a sensor wafer to form a cavity; thinning is carried out; cutting to form a prefabricated module; carrying out encapsulation treatment; manufacturing a TSV, an RDL and a solder ball; and finally cutting. By means of the innovative packaging structure and method, the advantages of low cost and high efficiency of wafer-level packaging are kept, meanwhile, the packaging reliability is remarkably improved, and the packaging structure can meet the requirements of high-end application such as vehicle gauge level application and the like.

The utility model discloses an installation structure of a rear penetrating tail lamp, and relates to the technical field of automobile lamps, the installation structure of the rear penetrating tail lamp comprises a back door plate assembly, a lamp body, a buckle assembly and a fastening assembly, the back door plate assembly is provided with a boss, the lamp body is provided with a limiting groove, a first sliding groove and a second sliding groove, the groove wall of the limiting groove abuts against the boss, the buckle assembly is in sliding fit with the first sliding groove, and the fastening assembly is in sliding fit with the second sliding groove. According to the technical scheme, the boss and the limiting groove are adopted to achieve positioning of the lamp body in the left-right direction, internal stress generated by installation accuracy difference can be reduced through tiny relative displacement of the boss and the limiting groove in the up-down direction, and the clamping buckle assembly and the fastening assembly are adopted so that the lamp body can be firmly fixed when thermal expansion and cold contraction happen. The buckle assembly and the sliding groove bolt can generate tiny relative displacement relative to the lamp body in the left-right direction, so that the internal stress is greatly reduced, and the lamp body is prevented from cracking.

The present application relates to the field of metal soft magnetic powder cores, and in particular to a high-insulation and high-reliability metal soft magnetic powder core and a preparation method thereof. The preparation method comprises the following steps: S1, powder passivation; S2, surface modification; S3, insulation coating; S4, compression molding; S5, first heat treatment; S6, second heat treatment: subjecting the cured part to high-temperature heat treatment under vacuum to obtain a high-insulation and high-reliability metal soft magnetic powder core. The preparation method of the present application is simple, with mild reaction conditions and low cost. At the same time, it simplifies the existing process flow and can be automated for large-scale production. The present application successfully prepared a high-insulation and high-reliability metal soft magnetic powder core with both high magnetic permeability and high toughness through a series of innovative technical means and process improvements. This material not only has excellent magnetic properties and insulation properties, but also shows obvious advantages in cost control, production efficiency and environmental protection.

The invention discloses a cam, a damping device and a vehicle, and belongs to the technical field of vehicles. The cam is an equal-width cam, the base circle radius of the cam is Ra, the extending stroke of the cam is h, and Ra is larger than or equal to 0.4 * h; wherein the extending stroke is the movement limit of the cam.

This specification provides a polishing apparatus, comprising: a first rotating member configured to drive a workpiece to rotate; a housing defining a polishing chamber configured to contain a polishing medium; wherein the workpiece is located within the polishing chamber, immersed in the polishing medium, and driven to rotate relative to the polishing medium by the first rotating member.

The present invention provides a laser cladding method and device for preparing a composite layer on the surface of a rail, and belongs to the technical field of laser surface engineering of large workpieces. Laser cladding technology is used to clad an alloy layer layer by layer in the area to be clad, and the alloy is a second-phase particle-reinforced material. An auxiliary heat source is simultaneously applied to the surface of the cladding layer that has solidified and completed the solid-state phase transformation, and the surface of the cladding layer is heated again. The energy of the auxiliary heat source is adjusted in real time to stabilize the surface temperature of the cladding layer to the optimal temperature range required for reheating the cladding layer. In this temperature range, the nucleation and precipitation of the second-phase particles in the cladding layer can be promoted but not significantly grown, so that the microhardness and mechanical properties of the cladding layer are significantly improved, thereby obtaining a rail surface with excellent wear and rolling contact fatigue performance. The present invention also provides a corresponding device.

The invention discloses a heat treatment method of a high-silicon soft-magnetic stainless steel large-size blank, which comprises the following steps: the charging temperature T1 of the blank is equal to a * (1.0-1.5) DEG C, and a is the length of the short side of the end face of a square ingot or a square blank in millimeter; the heating furnace is heated to the heat treatment soaking temperature T2 at the heating speed V1, then heat preservation is conducted according to the heat preservation time t, V1 = (100-150) DEG C / h, T2 = 600 DEG C + 8 * (Cr% + 2 * Mo% + 4 * Si%) DEG C, and t = a * (0.8-1.0) min; and the blank is cooled to 400 DEG C or below at the cooling speed V2 and then taken out of the furnace to be cooled, wherein V2 is equal to (2-4) * 104 / a DEG C / h. By controlling the heat treatment temperature, the heat preservation time and the cooling speed after discharging, the internal stress of the blank is improved, plasticity is good, crack resistance is good, the yield reaches 95% or above, and on the premise that the excellent corrosion resistance of an electromagnetic valve produced and manufactured through the high-silicon soft magnetic stainless steel large-size blank subjected to heat treatment is kept, the service life of the electromagnetic valve is prolonged, and the service life of the electromagnetic valve is prolonged. The technical problem that in the prior art, high-silicon soft magnetic stainless steel is prone to cracking in the production process is solved, the rejection rate is remarkably reduced, and the quality stability of electromagnetic valve products is guaranteed.

The utility model relates to a support assembly for engineering machinery and the engineering machinery comprising the support assembly. The support assembly comprises a first support and a second support. The first bracket is configured to mount a heat insulation member for isolating heat dissipation of an engine of the engineering machinery; the second bracket is arranged on one side of the first bracket and is configured to mount a covering component of the engineering machinery; the support assembly further comprises a connecting support, the connecting support is connected with the first support and the second support, and the connecting support is constructed into an integrated piece. According to the support assembly, the first support and the second support are connected through the connecting support so as to strengthen the first support, the number of connecting pieces and the number of welding points are reduced through the integrated connecting support, and the probability of failure of the welding points is reduced.

The invention belongs to the technical field of conductive materials, and particularly relates to a graphene composite conductive material and a preparation method thereof.The graphene composite conductive material is prepared from, by weight, 12-25 parts of MnO2 / graphene composite material, 15-25 parts of graphite powder, 35-50 parts of macromolecule resin and 1-8 parts of filler, according to the MnO2 / graphene composite material, the electron migration efficiency is improved by utilizing the huge specific surface area of graphene, MnO2 particles uniformly grow on a graphene sheet layer, agglomeration and accumulation of the graphene sheet layer in the compounding process can be prevented by uniform loading of MnO2, an effective conductive path is formed by graphite powder and the graphene layer, and the conductivity of the composite material is improved. Functional groups on the surfaces of the graphene and MnO2 are chemically bonded with a macromolecular resin molecular chain, so that the interface interaction is enhanced, and the used filler has relatively high strength and modulus and is used as a reinforcing phase to improve the mechanical property of the graphene composite conductive material.