38 results about "Flattop" patented technology

The invention provides a laser welding method for tailor-welding hot forming steel with the tensile strength exceeding 1500 Mpa after hot forming before hot forming, and particularly relates to a method capable of avoiding cracking of a heat affected zone after welding. The hardness distribution of a heat affected zone is controlled during laser welding cooling, so that the hardness of the heat affected zone after welding does not exceed the highest hardness of a weld joint melting zone, and the highest hardness value does not exceed H / 3-20 HV; (H is the tensile strength of the material obtained after thermal forming); the minimum width of the heat affected zone is not less than 0.2 m; the method specifically comprises the steps that energy distribution of a laser welding heat source is controlled in the welding process, a laser beam forms a flat-top light source on the surface of a workpiece, a welding pool is formed when the light source irradiates the workpiece for welding, the welding pool has the length L and the width B, and L / B is larger than or equal to 3. A welded joint obtained through the laser welding method has excellent post-welding cracking resistance for welding of high-strength steel with the tensile strength exceeding 1500 Mpa after thermal forming.

The invention relates to a flexible dual-mode capacitive touch sensor based on a three-gradient micro-dome porous structure. The sensor adopts a sandwich structure and comprises an upper electrode layer, a TGP dielectric layer and a lower electrode layer, wherein the upper electrode layer and the lower electrode layer respectively cover the upper surface and the lower surface of the TGP dielectric layer; the TGP dielectric layer comprises a gradient part and a porous part, the porous part is located on the upper surface of the lower electrode layer, and the gradient part is distributed on the porous part; the gradient part comprises three kinds of micro-dome structures and flat-top protrusions. Different pressure working characteristics of the two structures are fully utilized, so that the porous structure works in a low-pressure area, the gradient structure works in a medium-high pressure area, the performance of the porous structure and the gradient structure is synergistically enhanced, the linear range of the sensor is widened, and the sensitivity is further improved.

The invention discloses a composite additive system based on programmable laser beam-double arcs and a working method of the composite additive system. The composite additive system is mainly composed of a laser unit, a beam shaping unit, a deformation optical unit, a double-arc unit, a double-wire-feeding unit, a substrate unit and a light spot shape unit. According to the system, Gaussian laser is converted into a flat-topped beam through a pi Shaper collimation beam shaper, and the shape and intensity distribution of a light spot are dynamically regulated and controlled by combining an electromagnetic actuating self-adaptive optical element; the double arc units cooperate around the laser beam to achieve gradient deposition of heterogeneous materials such as titanium / aluminum and the like in cooperation with an independently-controlled wire feeding system. A closed-loop feedback mechanism is adopted, molten pool parameters are monitored in real time through an optical sensor, laser power, electric arc parameters and wire feeding speed are dynamically adjusted, and molten pool stability and metallurgical reaction control precision are remarkably improved. The system can meet the multi-material composite additive manufacturing requirements of multifunctional parts of complex structures, and is particularly suitable for efficient forming of high-performance titanium-aluminum alloy components in the aerospace field.

The invention discloses a temporary structure suitable for an assembly type station ending end, which comprises a temporary support structure arranged in a shape like a Chinese character'tian ', the temporary support structure is divided into a foundation support frame provided with an outer ring and a cross-shaped inner support frame body arranged between the foundation support frames, and the temporary structure further comprises an underpinning system arranged in the temporary support structure; through the construction method and structure of firstly building temporary steel beam columns and firstly supporting and then underpinning, the assembly starting point and end point positions of the full-prefabricated rectangular flat-top assembly type station are suitable for the working condition, the method can solve the problem of space and time conflict between the assembly trolley and the temporary steel stand columns, it is ensured that the assembly trolley is normally put into use, and the construction efficiency is improved. Meanwhile, the mounting and dismounting workload of the temporary section steel beam column is reduced, the construction efficiency is improved on the premise of ensuring the splicing quality, the high-place operation risk is reduced, meanwhile, normal construction of a post-pouring beam column system can be ensured, and the mounting and dismounting amount of large section steel components is reduced.

The invention discloses a method for preparing a copper-tin alloy coating on the surface of steel through ultrahigh-speed laser cladding, which comprises the following steps of: S1, pretreating a steel substrate, and controlling the surface roughness Ra to be 2.5-3.2 microns; s2, spherical copper powder and flaky tin powder with the particle size of 15-53 microns are taken, and the copper powder is treated through microwave plasma, so that a nanoscale copper oxide layer is formed on the surface of the copper powder; s3, tin powder and the activated copper powder serve as coating raw materials, an airborne double-barrel powder feeder is adopted, laser is in a flat-top type circular light spot mode, a steel substrate moves relative to a laser cladding device according to a set track, the laser power is 3.5-4.5 kW, the laser scanning speed is 50-80 m / min, and the copper powder is molten into a liquid state to wrap the tin powder; and the temperature of the molten pool is monitored in real time, so that the temperature is stabilized at 1300-1400 DEG C, and finally the copper-tin alloy coating is prepared on the surface of the steel substrate. According to the method, efficient, high-precision and low-defect manufacturing of the copper-tin alloy coating is achieved through a light-powder-matrix coordinated regulation and control mechanism.

The invention discloses a flat-topped beam uniformity optimization and centroid position control feedback system and method, and belongs to the technical field of automatic feedback control. The problems that an optical element needs to be frequently adjusted in a traditional method, and the same accuracy and reaction speed are difficult to achieve in a method of manually adjusting the optical element in an optical path are solved. The closed-loop feedback system comprises a laser, a first lens, a second lens, a first reflector, a second reflector, a third reflector, a spatial light modulator, a polarization beam splitter (PBS), an achromatic lens, a fourth reflector, a camera, a computer, a high-voltage amplifier, piezoelectric ceramics and a lambda / 2 wave plate. The position and intensity distribution of the flat-topped light beam are dynamically adjusted through a real-time image processing technology, and an experimenter does not need to manually adjust optical elements in a light path. The method is more flexible and higher in precision. The innovation not only helps to improve the accuracy and efficiency of the experiment, but also provides important support for smooth development and development of the experiment.

The invention discloses a flat top material distribution device of a stocker, relates to the technical field of stockers, and aims to solve the problems of narrow material distribution range, poor flatness and high energy consumption of a traditional stocker. The device comprises a transfer assembly, a discharging assembly and a driving assembly. The transfer assembly comprises a material receiving hopper and feeding blades, and stable transfer and stasis removing of materials are achieved. The discharging assembly comprises a fixed pipe, a flexible pipe, a first discharging pipe and a second discharging pipe, the upper portion of the first discharging pipe is hinged to the first hinge seat, and the first discharging pipe is in butt joint with the fixed pipe through the flexible pipe; the second discharging pipe is arranged on the first discharging pipe in a sliding and sleeving manner, so that the discharging assembly synchronously performs swinging telescopic discharging along with the rotating action of the feeding blades, and the material distribution range is expanded; the driving assembly comprises a center gear, a driving gear and an eccentric driving assembly, feeding power is reused, and meanwhile the discharging assembly is driven to act. Large-area and high-uniformity flat-top stacking can be realized without frequently moving the stacker, and the flat-top stacking machine is suitable for bulk material stacking in multiple scenes such as mines and ports.

The invention relates to the technical field of ultrafast laser spectrum technology and precision optical design, in particular to a flat-topped homogenization pumping light spot generation system and method for transient absorption spectrum, and the system sequentially comprises a micro lens array, a field lens, a soft-edge diaphragm, a spatial filter and a focusing lens along the light path propagation direction. After incident irregular pump light is homogenized by the micro-lens array and collimated by the field lens, soft edge cutting is carried out by the soft edge diaphragm, and a circular flat-topped light spot is output; residual periodic intensity noise in the light field is filtered through a spatial filter formed by a confocal lens group and a pinhole diaphragm; and finally, a flat-topped light spot which is highly uniform in energy density, free of internal modulation and smooth in edge is obtained and is focused to a sample. According to the invention, the problem that the light spot shape, uniformity, edge smoothness and internal noise are difficult to consider at the same time in the prior art is solved, and the spatial overlapping quality of the pump light and the probe light and the signal-to-noise ratio of transient absorption spectrum measurement are remarkably improved.

The present invention discloses a method for forming a secondary edge-shaped flat-top pulse, which is used to perform secondary edge-shaped flat-top pulse shaping on the high-order pulse signal output by the front-end analog system of a nuclear radiation detector. Starting from the decomposition of the system function and combining the progressive construction process of the pulse signal in the time domain and the z domain, this method overcomes the limitations of previous pulse shaping based on low-order typical pulse signals, which ignores the "high-order" and "complex" nature of the physical system. The rich characteristics of the formed secondary edge-shaped flat-top pulse are beneficial to the adoption of high-performance analysis algorithms (such as deep learning, etc.) in pulse recognition and overlapping pulse decomposition, and are conducive to greatly improving the accuracy of energy spectrum measurement.

The invention relates to a method and a system for simulating dynamic evolution of a nitrogen element in a melting process of an anti-hydrogen steel laser powder bed. The method comprises the following steps: constructing a three-dimensional model of a powder bed through a discrete element method, and simulating different energy input characteristics by adopting Gaussian, flat-topped, annular and Bessel laser heat sources; establishing a heat transfer model following mass, momentum and energy conservation by using a volumetric method, and setting natural convection, a thermal radiation boundary, recoil pressure and gas-liquid interface changes; according to a macrosegregation and solute migration mechanism, a motion model of a nitrogen element between a liquid phase and a solid phase is constructed, a critical nitrogen content threshold value is introduced, and the gasification escape and bubble forming process of the nitrogen element is simulated. According to the method, on the basis of the molten pool temperature field and flow field detailed nitrogen element distribution / escape simulation result, the molten pool dynamic mode and melt convective heat transfer and mass transfer evolution law under the laser time-domain airspace shaping condition can be clarified, the nitrogen element distribution / escape characteristics are clarified, and the influence mechanism of time-domain airspace laser shaping regulation on pore defect formation is revealed.

The present invention discloses a mold for a reflective material with a flat-top microprism array and a preparation method thereof. The mold for the reflective material is formed by a unit flat-top microprism array, and the side surface of the unit flat-top microprism is a quadrilateral. In the present invention, a fine V-shaped groove is milled in the first direction by using a V-shaped cutter. After all the milling in the first direction is completed, the milling enters the next milling direction to mill a fine V-shaped groove, so as to construct a mold for a reflective material with the same unit flat-top microprism array. This preparation method not only reduces the number of milling times, improves the production efficiency of the mold, and reduces the milling difficulty, but also the flat-top microprism array reflective material produced has the excellent property of maintaining a high retroreflective coefficient under large-angle incidence and observation conditions, which helps to improve the visual recognition of reflective signs in sections with a large visual blind area, such as high-speed entrance and exit ramps and interchange curved guiding roads, and improves the safety driving coefficient.

The utility model relates to the technical field of optics, in particular to a laser shaping system. According to the invention, through the laser shaping system formed by combining a plurality of lenses, the collimated light emitted by the laser can be shaped into uniform flat-top rectangular light spots, and the shaping efficiency of the system is high; and the system can bear higher incident light power, so that higher power density of emergent illumination light spots is ensured.

The invention discloses a double-width line pulse flat-top oscillation improvement structure and method, and solves the problem of pulse flat-top oscillation caused by inconsistent reflection distortion of an inner line and an outer line of an existing double-width line. The double-width line structure comprises a double-width line outer cylinder with one closed end, a double-width line middle cylinder and a double-width line inner cylinder are sequentially and coaxially arranged in the double-width line outer cylinder, a magnetic core is arranged in the double-width line middle cylinder, and the double-width line structure further comprises an inner line short-circuit surface and an insulating medium. Step wave transmission distortion caused by external line open circuit reflection is reduced; an inner line short-circuit reflection section is additionally arranged, so that step wave transmission distortion caused by inner line short-circuit reflection is increased; during load pulse flat-topped output, wave front edges of internal line and energy storage external line step wave transmission are consistent when the internal line and energy storage external line step wave transmission are superposed and counteracted at a series output end, so that flat-topped oscillation can be reduced.

The application discloses a laser remanufacturing repair method for metal shaft parts, and relates to the technical field of laser repair.The method comprises the following steps: placing a target shaft part to be repaired on a workbench, performing repair processing on a cladding area of the target shaft part by using flat-top light, obtaining a repaired shaft part, and adjusting the focal depth length of the flat-top light in real time by using an external optical device; and stopping the repair operation after detecting that the size of the repaired shaft part meets the preset required size.The application achieves the technical effect of making the laser energy density distribution uniform and improving the fatigue resistance of the shaft part and the consistency of the overall repair quality.

The utility model discloses a module installation structure flat top, which belongs to the field of module installation, and comprises a first gypsum board, in a workshop, various covering keels, edge covering components and leveling components which are cut according to the size of a drawing in advance are arranged according to the marked positions of the drawing, and a leveling device can be independently installed when the gypsum board is installed. The overall height of the leveling device can be adjusted through the adjusting screw, during connection, the edge covering inserting piece is inserted into the connecting keel or the edge keel on one side, the leveling top piece is connected with the top face keel on the top, the structure is high in construction efficiency, little in construction waste and environmentally friendly, the flat top structure is firm and not prone to deformation, the service life of the structure is prolonged, and the construction cost is reduced. During construction, noise is low, interference to the surroundings is small, influence of manual operation on construction quality is small, various materials are not needed during construction, intensity of workers is reduced, leveling efficiency is high during installation, installation cost is reduced, construction time is guaranteed, and installation quality is guaranteed.

The invention discloses a galvanometer scanning laser processing system and method for coaxial laser heating and dynamic temperature control, and belongs to the technical field of laser additive manufacturing. The system comprises a main processing laser module, a preheating light path module, a coaxial beam combining and scanning module, a temperature control monitoring light path module and an intelligent control system. The preheating light path module and the light beam shaping lens group generate uniform flat-topped light spots through a specific light path, the coaxial beam combining and scanning module achieves coaxial output of main machining laser and preheating laser, the temperature control monitoring light path module monitors the temperature in real time, and the intelligent control system executes dynamic temperature closed-loop control. According to the method, machining is completed through path planning, parameter setting, preheating starting, temperature control closed loop establishment, synchronous machining and layer-by-layer circulation. Accurate and uniform preheating and dynamic temperature control of the machining area can be achieved, residual stress and process defects are remarkably restrained, the part forming quality is improved, and the method is particularly suitable for high-quality machining of nickel-based high-temperature alloy and other materials difficult to machine.

1. The name of the design product: buried lamp (square head flat top). 2. The use of the design product: for atmosphere lighting. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

1. Name of the designed product: solar lamp (flat top with handle). 2. Use of the designed product: solar lamp for lighting, which converts solar energy into electricity as long as there is light. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: Design 1 perspective view 1. 5. Design 1 is designated as the basic design.

The utility model discloses a dome structure of a large cylindrical bin body in the field of constructional engineering, which comprises a framework structure in a hemispherical shape on the whole, a gap is reserved at the spherical surface of the framework structure, a mounting ring is arranged at the edge of the bottom of the framework structure, and the outer diameter of the mounting ring is matched with the inner diameter of the cylindrical bin body; the coating structure is covered in the gap of the framework structure, and a sealing structure is arranged between the coating structure and the framework structure; the dome has the advantages that the dome is formed by arranging the cladding plate and the ribs, compared with a flat roof, water is not prone to accumulating, the sealing protruding strips and the sealing grooves are arranged between the cladding plate and the ribs for sealing, the waterproof performance can be further improved, the structure is simple, and manufacturing is convenient.

The invention provides a flat top distribution multi-scale aerosol jet printing method. According to the method, on the basis of anisotropic nozzle structure design of fluid dynamics, wide aerosol jet flow with the specific width and stable collimation is generated, the near-Gaussian deposition mode of traditional cylindrical aerosol jet flow is broken through, and high-flux and multi-scale flat-top deposition is achieved. According to the method, processes such as a programmable scanning path, multi-material in-situ mixing and deposition, dynamic regulation and control of jet flow resolution, curved surface conformal printing and the like are combined, so that aerosol deposition has high flexibility and adaptability in the aspects of multi-scale structure construction, composite material distribution regulation and control and complex three-dimensional surface in-situ forming; and the high-efficiency integrated manufacturing requirements of advanced flexible electronics, functional films, gradient structures and curved surface conformal devices in the future are met.

The invention relates to the technical field of sampling equipment, and discloses a low-disturbance reservoir deep and thick deposition layer sampling device which comprises a base, the base is in a big-end-up flat-top pyramid shape, and the outer wall of the base is provided with four mounting surfaces which are obliquely arranged in the same size; a columnar center cavity is formed in the middle of the inner side of the base, and a center column is arranged in the center cavity. The vertical downward moving mechanism is arranged at the middle upper part of the mounting surface of the base and is used for ensuring that the whole sampling device keeps a moving state of vertical downward moving after entering water. By adding and arranging the deposition sampling mechanism, when the deposition layer substances at the bottom of the reservoir are sampled, the deposition layer substances can be quickly frozen on the surface of a metal sampling plate by the mechanism under the freezing action of ultralow-temperature ethanol, layering damage, particle loss and pore collapse caused by mechanical disturbance are avoided, and original-state non-disturbance sampling is realized; the original characteristics and layering state completeness of the sample are ensured.

The utility model relates to a DOE switching device. The device is configured in an optical path of an additive manufacturing apparatus before a laser beam is incident on a deflection mirror (25) and includes a support portion (31), a separation portion (32), and a mounting portion (33). The supporting part (31) is respectively and fixedly connected with the deflecting mirror (25) and a component before a laser beam enters the deflecting mirror (25), the separating part (32) is detachably fixed on the supporting part (31), and the mounting part (33) is fixed on the separating part (32) and is provided with a diffractive optical element for shaping a Gaussian light spot of the laser beam into a flat-topped light spot. According to the invention, free switching among different light spot shapes can be realized, and repeated installation errors during DOE switching can be reduced, so that the light spot shape required by single crystal preparation can be better met.

The application discloses a polarization-insensitive silicon-based flat-top filter for a coarse wavelength division multiplexing system. The output end of a mode demultiplexer is connected with two input connection S-bend waveguides through an adiabatic 1*2 beam splitter. The output ends of the two input connection S-bend waveguides are respectively connected with two input ends of a Bragg grating through one input tapered waveguide respectively. The two output ends of the Bragg grating are respectively connected with two input ends of an output connection S-bend waveguide through one output tapered waveguide respectively. The two output ends of the output connection S-bend waveguide are connected with an output port through an adiabatic 2*1 beam combiner. The application solves the polarization sensitivity problem of the existing CWDM filter on a silicon substrate, is helpful to further simplify the structure on the chip, improve the comprehensive performance of the system on the silicon substrate, and has a wide application prospect.

This invention relates to a method for laser-aligned brazing of vibration-damping bosses on aero-engine fan rotor blades, comprising the following steps: Pre-welding preparation of the fan blade: fixing pressure-sensitive adhesive tape to the non-welding area of ​​the blade body and the boss; Brazing solder preparation: mixing Lielite hard alloy powder and brazing filler metal to form a brazing filler metal mixture powder; preparing Lielite adhesive; thoroughly mixing the prepared adhesive and brazing filler metal mixture powder to form a paste; Pre-laser alignment brazing preparation: applying the paste brazing filler metal to the boss; placing the coated blade in an environmental chamber, then evacuating the chamber and filling it with argon gas to maintain atmospheric pressure; Laser alignment brazing: using a rectangular flat-top laser, with the spot size determined by the wear-resistant boss on the blade; Post-brazing inspection: using fluorescence and X-ray inspection to check the welding quality. This invention solves the problem of uneven wear-resistant layer caused by induction brazing methods. This invention can ensure uniform distribution of hard alloy on the surface of the wear-resistant layer.

The application discloses a flat-top quasi-end-fire microstrip antenna, which is characterized in that a multi-step strip resonator is arranged obliquely above four sequentially arranged patch resonators, horizontal currents at two ends of the multi-step strip resonator and a horizontal parallel current in the middle are formed, the currents at the two ends and the current in the middle are opposite, and after the polarization currents of the four patch resonators are superposed, quasi-end-fire with a flat-top radiation effect is realized, and a quasi-end-fire surface is orthogonal to a polarization direction.

The invention discloses an absorbent paper microporous structure precise control laser drilling device which comprises a rack, an unwinding mechanism, a pretreatment mechanism, a self-adaptive paper pressing mechanism and a winding mechanism are sequentially arranged at the upper end of the rack, and a laser drilling mechanism and an online detection hole patching mechanism are arranged on the two sides of the upper portion of the self-adaptive paper pressing mechanism correspondingly. And the laser drilling mechanism comprises a second mounting frame, a second electric linear guide rail, a moving seat, an electric turntable, a first light path unit and a position sensor. According to the laser drilling equipment capable of accurately controlling the microporous structure of the absorbent paper, by arranging the laser drilling mechanism of the double-light-path unit and matching with a second electric linear guide rail and an electric rotating disc, multi-dimensional movement adjustment is achieved, the laser beam coverage range is expanded, meanwhile, the machining efficiency can be guaranteed without depending on high-speed transmission, the micropore spacing error is effectively avoided, and the production efficiency is improved. And a laser beam shaper is combined to shape the laser beam into a flat-topped beam, so that the aperture size is uniform and consistent, and the precise control effect of the micropore structure is improved.

The invention discloses a wide-spot tin bronze laser cladding method, and belongs to the technical field of laser remanufacturing. The method comprises the following steps: physically dehumidifying tin bronze powder; the minimum critical preheating temperature of the base material is determined based on the dynamic relation between the molten pool solidification life and the bubble escape time; configuring a rectangular flat-top wide light spot, and calculating a critical power density upper limit based on a tin element saturated vapor pressure model; and performing laser cladding under the condition that the actual power density is controlled to be maintained in a preset safety range. According to the method, the multi-physics field coupling model and the wide light spot technology are combined, the temperature gradient is reduced through the flat-topped light beams, the machining efficiency is remarkably improved, meanwhile, tin element burning loss is effectively restrained, the number and size of air holes in the coating are reduced, and preparation of the tin bronze coating with the low dilution rate and the high quality is achieved.

The invention relates to the technical field of pulse power, and discloses a flat-topped pulse current generating device for metal preparation and a control method. The control method corresponds to the flat-topped pulse current generating device. The device comprises a charging circuit, a main power circuit, a ripple compensation circuit and an inductive load, and the control method adopts a structure of combining a high-voltage energy storage circuit and a follow current energy feedback circuit, so that energy stored in a metal load is fed back to the high-voltage energy storage circuit while a rising edge and a falling edge are shortened; in the flat-top stage of the metal load current, the H-bridge circuit realizes preliminary compensation for the flat-top current; the linear adjusting tube is used for carrying out finer compensation on the flat-top current; meanwhile, by monitoring the real-time temperature of the metal, the repetition frequency needed by the metal to be stably maintained at the target temperature under the condition that the flat-top current amplitude and the pulse width are set is dynamically calculated; and finally, high-efficiency and low-ripple flat-topped pulse current is generated.