185results about How to "Change stress" patented technology

The invention provides a telescopic double-edged deep-hole boring cutter, aims to provide a deep-hole drilling boring cutter which has large length-diameter ratio, small self-excited vibration of a boring bar, reliable and stable feeding operation, no radial motion of a cutter arbor, and radial feeding of a cutting edge in a cutting process, and solves the problem that the deep-hole bottle cavity with large length-diameter ratio has large processing difficulty. The boring cutter comprises the boring bar which can extend to the deep-hole bottle cavity, wherein the central axis of the boring bar is provided with a through hole which runs through the central axis; a push rod (2) which is connected with a radial feeding device of the head of the boring bar is arranged in the through hole; the rear end of the push rod (2) is provided with a rotating handle; the rotating handle rotates a screw (5) and pushes the push rod (2) to do radial telescopic motion in the through hole of the boring bar; and the push rod (2) moves by way of pushing or pulling to drive the radial feeding device connected with the push rod and adjust the cutting edge of the double-edged boring cutter on a cutter block (3) to radically feed in the deep-hole bottle cavity.

The invention relates to a method and a device for laser shock forming on the basis of a polyurethane rubber film. The method is characterized in that shock waves induced by laser are used as a power source for forming; the polyurethane rubber film is used as a concave film for the laser shock forming; and the stress condition of a plate under the action of the shock waves is changed to achieve the shock forming of a complicated curved surface. The device comprises a laser generating device, a light guide system, a laser shock head, a polyurethane rubber film system and a control system and is also provided with a detection feedback system with a displacement measuring device. According to the requirement of the curved surface shape and forming rules of a plate, laser shock process parameters are optimized, the polyurethane rubber of proper hardness and thickness are selected, and the plate is deformed under the associative action of the shock waves and the polyurethane rubber. The device not only can achieve the complicated and precise forming of the plate, but also can carry out the flexible leveling of the plate, and also can be applied to the surface shock strengthening treatment of materials.

The invention discloses nano-scale high-precision additive manufacturing equipment. The nano-scale high-precision additive manufacturing equipment comprises a printing platform and a printing nozzle,wherein a high-voltage pulse power supply is applied between the printing platform and a conductive nozzle of the printing nozzle; and a uniform-intensity magnetic field perpendicular to the printingplatform is further arranged between the printing platform and the printing spray head, and the distance between the printing platform and the printing nozzle meets the characteristic requirements. According to the nano-scale high-precision additive manufacturing equipment, nano-scale 2D and 3D additive manufacturing is achieved, high-voltage pulse electric fluid dynamic jetting, a nano-scale printing head and a constraint magnetic field are benefited, and the problem that high-precision nano-scale materials cannot be constructed in the prior art is solved, and particularly relates to the insufficiency and restrictions in the field of electronic circuit board printing, nano energy storage, solar cells and biomedicine, flexible electronic materials, high-flux preparation and the like.

The invention relates to the field of processing of metal laminated plate belts, in particular to a method for rolling a magnesium-aluminum laminated plate by a drum-shaped corrugated roller. The method comprises the following steps of selecting a magnesium alloy plate with the same length and width as a clad plate and a pure aluminum or aluminum alloy plate as a base plate, cleaning the surface of the metal plate, buckling and assembling the ground surfaces of the base plate and the clad plate together, or buckling and stacking and assembling together. In the first pass, when the drum rolleris used for rolling the magnesium-aluminum laminated plate, a stress peak value can be formed on the lowest metal interface of the laminated plate, and the combination of the middle part of the laminated plate and the wave trough of the wave interface is promoted. In the second pass flattening process, a stress peak value is formed on the edge part of the laminated plate with poor bonding and themetal interface at the wave peak part during the first pass rolling of the plate, large plastic deformation is generated at the same time, and the bonding of the edge part of the laminated plate is promoted. According to the process, rolling is carried out twice in sequence, the bonding of the whole interface is promoted, and the bonding strength of the interface of the laminated plate is improved.

The invention belongs to the overall blade disk technology of turbines and relates to an adjustment structure and method for the inherent frequencies of blades of the overall blade disk of a turbine. Firstly, the initial inherent frequencies of the blades of the overall blade disk of the turbine are measured; then, according to the measured frequencies, the excitation frequency of periodic pulsation of airflow or the result of dynamic stress measurement is combined and the blade frequency needing to be adjusted is calculated, so that the inherent frequency of each stage of the blades can have safe resonance frequency margin; then, according to the blade frequency needing to be adjusted, the space between every two blades of the overall blade disk is slotted, and the radial depth of each slot is determined according to the requirements of adjusting the frequency; a stop hole is formed in each slot bottom, and a pin is mounted in each stop hole. The structure and the method effectively reduce the inherent frequencies of the blades and change the stiffness, modes of vibration and vibration stress distribution of the blades, and the blades do not resonate or the important mode of vibration of resonance of the blades is tuned out the range of working speed. The structure and the method are simple and easy to operate and significant in frequency modulation effect, are easy to control size precision, and can meet actual requirements.

The impact type water turbine wheel features that the wheel has at least one outer hoop to connect all the buckets successively and the circular hoop is set in the maximum position. The present invention has the advantage of changing the stress state of the buckets to avoid concentrated stress in the roots of the buckets leading to fatigue, crack and breaking while maintaining the basic structure and the production process of traditional impact turning wheel.

The invention discloses a composite diamond coating hard alloy cutter mold and a preparation method thereof. The surface layer of the hard alloy cutter mold is provided with composite coatings composed of boron-doped or non-boron-doped micron-crystal diamonds and nanocrystalline diamonds which are alternately arranged, and a layer of diamond-like coating DLC is deposited on the surface of each composite diamond coating. The preparation method comprises the steps of oil removal and degreasing, chemical micro-etching, plasma activation, plasma enhanced gaseous boronizing, plasma cleaning, diamond slurry ultrasonic grinding, nano-scale and micron-diamond seed crystal planting, and vapor-phase deposition of the diamond composite coatings. According to the method, boron atoms enter diamond crystal lattices by doping boron in the diamond deposition process, the internal stress of the diamond coatings is adjusted, and the generation of a stress sudden change region is avoided, so that the situation that the stress of each layer is not matched is avoided fundamentally, the stress distribution inside the composite coatings is effectively improved, the integrity of the micro-nano composite coatings is further improved, the substrate-film binding force is improved, and the comprehensive mechanical property of the composite coatings is improved.

The invention discloses an asymmetric dynamic balance vertical milling cutter which comprises a cutter shank part and a cutting part, wherein the cutting part comprises more than two peripheral cutting edges and chip flutes, wherein each chip flute is arranged between every two adjacent cutting edges, the sizes of two adjacent chip flutes are different, and an unbalance quantity control step which enables the vertical milling cutter to satisfy the dynamic balance requirement is arranged at the tail of each chip flute. The asymmetric dynamic balance vertical milling cutter has the advantages of high metal removal rate and high processing accuracy and satisfies the requirement for dynamic balance.

The invention discloses a motor rotor web crack welding repair method and solves the problems that a saw-toothed or crescent electrode is originally used to increase bath width and weld width, thermal stress is large and cracking occurs easily. A linear electrode manipulation method is adopted, a low-current small width welding method is adopted, arc ending is slow, a segment is re-welded to fill an end arc pit, the weld shape is changed, and cracking is avoided accordingly. A welding electrode A507 with higher tensile strength is used, a series of welding processes is taken, and the tensile strength of special equipment and special welds is met. The use of symmetric welding prevents excess welding stress effectively.

A recombination solid wood floor with its production method relates to a recombination construction art within three-ply boards, wherein a middle board layer comprises rectangular wood bricks in direct processing art which are connected to be a base block board, and at least one side of the base block board is recombined with a -shaped wood board of different fiber orientation, while the base block board is recombined with at least two rectangular wood bricks via bars between the every two rectangular wood bricks. The method comprises processing the rectangular wood bricks to be a base layer of floor in direct processing art, making the rectangular wood bricks to be base block boards, and recombining the connected base block boards with the wood boards of different fiber orientation, thereby making the block board of floor to be -shaped. The method has advantages of simple structure, easy processing art, good quality, low cost, convenience assembling, and good using effect.

The invention discloses a piezoelectric composite material helicopter blade structure and a control method thereof. A piezoelectric composite material is embedded into a composite material lamination structure of a rotor blade. An analysis model is established and is capable of accurately describing the motion rule of the rotor blade based on a structure model, an aerodynamic force model, a piezoelectric composite material model and the like, and further accurately calculates the dynamics characteristics of the rotor blade. According to the control method, a controller is employed for controlling the rotor blade, a Kalman observer is employed for obtaining rotor blade data under the condition of white noise interference, and the rotor blade data is taken as input variable for controlling, and further by using the controller to control the input voltage of the piezoelectric composite material, the purpose of controlling blade dynamics response and deformation is finally realized. The provided model establishing method and the control method have relatively high versatility and accuracy, help to accurately obtain dynamics characteristics of the helicopter rotor blade, and are high in control efficiency.

The invention belongs to turbine blisk technologies, and relates to an anti-vibration type dual-alloy turbine blisk and a manufacturing method thereof. The anti-vibration type dual-alloy turbine blisk is formed by welding a precision cast blade ring component and a sintered alloy blisk body in a diffusion mode through hot isostatic pressure, cut joints are formed between blade channels of the blisk, damping holes communicated with the cut joints are formed in the lower portion of the rim of the blisk, and friction dampers are arranged in the damping holes. The anti-vibration type dual-alloy turbine blisk is formed by welding the precision cast blade ring component and the sintered alloy blisk body in the diffusion mode through hot isostatic pressure, flexible selection and best usability matching of turbine disks and blades are achieved, meanwhile, the friction dampers are arranged on the blisk, the damping and vibration reducing effect is improved, the purposes of improving anti-fatigue ability of the blades and reducing vibration stress of the blades are achieved, and the anti-vibration type dual-alloy turbine blisk has great practical use value.

The invention discloses a wrist developer. Fixing rods, movable rods, finger rods and holding handles are sequentially arranged on two mutually-parallel and equal-length long connecting rods, the fixing rods and the holding handles are fixedly connected with the long connecting rods, the movable rods and the finger rods are in sliding fit with the long connecting rods, the fixing rods are connected with the movable rods through elastic components, and the movable rods are connected with the finger rods through short connecting rods. According to the wrist developer, the finger rods and the holding handles serve as two handles of two wrist developers, the finger rods are parallel to the holding handles, the finger rods can be pulled by all the fingers except for the thumbs, and the aim of training the finger joints in a balanced mode is achieved. Compared with the prior art, the wrist developer is high in comfort performance and wide in application scope.

The present invention relates to decorative material, and is especially the production process of surface decorating color bamboo sheet. Colored bamboo sheets are matched and pressed into bulk material, which is then turned, planed or sawed and dried to form color bamboo sheet. The colored bamboo sheet is produced with thin bamboo sheet and through high temperature steaming, bleaching, drying, and pressure coloring inside one pressure container, vapor carbonization coloring, soaking coloring or printing coloring. The present invention provides various kinds of colorful decorating bamboo sheets.

The invention discloses a wall-attaching support for building construction with falling-prevention mechanisms. The wall-attaching support comprises a vertical plate, wherein supporting bodies are fixedly connected to one side of the lower portion of the vertical plate, and the two ends of a connecting rod are fixedly installed in T-shaped gaps of the supporting bodies through locking nuts respectively; a fixed shaft is fixedly inserted in a bearing inner ring of a supporting bearing, supporting teeth are fixedly connected to the circumference of the outer side of a rotary disc, and arc supporting openings are formed in the upper portions of the supporting teeth. Arc ratchet teeth are fixedly connected to the interiors of annular grooves, reversion-prevention ratchet pawls which are matchedwith the arc ratchet teeth are fixedly connected to the surfaces of one sides of sleeves, and reset springs further sleeve hexagonal prism supporting rods. The upper and lower wall-attaching supportsare connected together, then multiple sets of falling-prevention mechanisms are added at random positions between the upper and lower wall-attaching supports, thus the safety is improved, local stress of the wall-attaching supports is changed, local overload is lowered, and protection is achieved in an all-around way. In the meanwhile, connecting rods are easy to install and detach, the arrangement density of the wall-attaching supports can be lowered, and the cost is lowered.

The invention relates to a method for encapsulating and manufacturing a glue perfusion molded SIM (subscriber identity module) film card with a flip naked chip, which comprises the following steps of: directly flipping a thinned naked chip with a metal bump on a flexible circuit board of an SIM film card, and in a loading region of the SIM film card, using the glue to encapsulate the loading region of the flip naked chip by using the glue perfusion method. The SIM film card is produced by flipping the naked chip with the metal bump and pouring the glue, the thickness of the SIM film card and the consistency of the appearance are improved; and meanwhile, the stress state of the film card is improved due to the integral encapsulation effect of the glue so that the quality of the SIM film card is more stable and the batch processing can be realized. The film card can be prevented from damaging due to the extrusion and bending stress in the use process, so that the SIM card can be connected with the film card without holing or grooving.

The invention discloses a direct-drive type wave power generation maximum power tracking algorithm and system. The system includes a permanent magnet linear electric generator, a three-phase controllable rectifier, a Buck-Boost converter, a signal detection and conditioning circuit, and a DSP control circuit. The permanent magnet linear electric generator adopts improved direct thrust for control,and by adjusting the magnitude of magnetic force of the electric generator, the stress condition of the linear electric generator in sea waves can be changed. The optimal electromagnetism force is obtained by the fuzzy variable-step maximum power tracking algorithm, and thus maximum power tracking is achieved. In view of the extreme weather conditions, the motor rotor position is calculated by adopting linear hall, and the running state of the electric generator is monitored in real time. In the wave power generation system, the algorithm plays an important role in improving the power generation efficiency and increasing economic benefits.

The invention relates to high-zirconium alkali-resistant glass fiber surface-reinforced short-cut felt and a production method thereof, and belongs to the technical field of alkali-resistant glass fiber production. The method mainly solves the problems that existing medium-alkali and alkali-free glass fibers are poor in alkali resistance and cannot be applied to reinforced cement concrete. The felt is mainly characterized by comprising 55-64% of SiO2, 13.8-17.5% of ZrO2, 1.0-3.5% of TiO2, 4-7.0% of CaO, 11.0-13.5% of NaO2, 1.0-2.5% of K2O, 0-0.3% of Al2O3 and 0-0.2% of Fe2O3, and the felt is produced in the steps that high-zirconium alkali-resistant glass fiber filaments with the diameter of 7-9 micrometers are cut into filaments with the length of 50-75 mm, then the filaments are evenly distributed in multiple dimensions and then bonded through a powder adhesive or an emulsion adhesive, and then curing and drying are conducted. The method solves the problems that the alkali-resistant glass fibers are irregular in spray yarn distribution and poor in homogeneity, the durability can reach 60 years, and the half-life period is up to 100 years.