857 results about "Micro holes" patented technology

The invention relates to the technical field of material testing, and discloses a coating performance simulation method based on high and low temperature circulation and prestress loading. The method comprises the following steps: constructing a coating matrix composite geometric model containing a microporous structure by acquiring actually measured working condition data of a pipeline or a part, and quantifying surface roughness and interface curvature characteristics in combination with reverse engineering; a dynamic temperature-pressure coupling equation is generated based on the thermal expansion effect of a high-pressure medium, a micropore optical load is converted into equivalent heat flux density through a ray tracing algorithm, transient boundary conditions of a temperature field and a stress field are associated, a crack initiation path is simulated through an extended finite element method, and a life attenuation curve is predicted in combination with a Paris formula. And material parameters are dynamically corrected based on experimental data, and a multi-parameter collaborative optimization model is generated. According to the method, the problems of interface stress evaluation distortion and life prediction deviation under the combined load are solved, and multi-physics field co-simulation support is provided for coating compression resistance optimization.

The invention belongs to the technical field of fuel cells, and particularly relates to carbon paper for a gas diffusion layer with a water-gas management function and a preparation method of the carbon paper. The carbon paper for the gas diffusion layer comprises at least three alternately stacked carbon layer structures, odd layers are macroporous carbon layers, and the macroporous carbon layers are formed by dipping carbon fiber base paper in a mixed solution of resin and a conductive material and drying the carbon fiber base paper; the even-numbered layers are small-hole carbon layers, and the small-hole carbon layers comprise resin and conductive materials and are coated on the surfaces of the odd-numbered layers; the odd-numbered layers and the even-numbered layers are compounded through a hot-pressing process to form a composite material; the composite material is subjected to high-temperature heat treatment to form a carbon paper A conductive network is formed in the carbon paper, the carbon paper with higher conductivity is prepared, part of the conductive material is filled in the carbon paper to build a microporous structure, the low-gram-weight base paper forms a macroporous structure, and the conductive material and the resin are mixed to form a microporous structure, so that the water and gas management capability is favorably improved.

The invention relates to the field of visual measurement of parts, in particular to a non-contact micropore form and roughness measurement method and system. The method comprises the following steps: carrying out initial contour scanning on a precision part, carrying out part detection base point analysis, and extracting an optimal coordinate base point; performing full-coverage scanning planning and panoramic image splicing based on the optimal coordinate base point to obtain a panoramic fusion image; geometric structure point depth identification is carried out on the panoramic fusion image, three-dimensional point cloud modeling is carried out, and a part CAD digital model is constructed; carrying out micropore shape key size calculation based on a part CAD (Computer Aided Design) digital model, carrying out geometric comparison calculation, and extracting an error value of each measurement point; and performing deviation visual mapping and comprehensive evaluation according to the error value of each measurement point, and outputting a comprehensive evaluation report. According to the invention, the precision part detection efficiency and precision are improved, and the production quality control and later problem traceability of the precision part are enhanced.

The invention belongs to the technical field of hard and brittle crystal material micropore machining, and particularly relates to an ultra-precision micropore multi-energy field coupling machining method and system.The method comprises the steps that the laser pulse frequency and power are set according to the workpiece material type and the micropore depth-diameter ratio, and a laser focus is positioned at the inner hole bottom of a workpiece; a modified structure extending in the axial direction of a hole is formed by controlling matching of a light spot and a hole diameter and the movement track of the light spot, in the machining process, a plasma nozzle and laser coaxially move, a modified area is removed in real time, a heat affected zone and the hole shape taper are restrained, meanwhile, vibration is applied to a workpiece through an axial ultrasonic vibration device, and machining precision is improved. And chip discharge is promoted, and stress and crack generation are reduced. The problems of serious thermal damage, poor hole shape precision, low machining efficiency and high energy consumption in the micropore machining process in the prior art are solved, and high-quality and high-precision machining of the high-depth-diameter-ratio micropore of the hard and brittle transparent crystal material is achieved.

The invention discloses a mold partition temperature control system based on an air film adjustable thermal resistance boundary, and belongs to the technical field of mold temperature control and thermal management. The system comprises a mold body, at least two temperature control subareas and gas film adjustable thermal resistance boundary units arranged between the adjacent temperature control subareas. The air film adjustable thermal resistance boundary unit comprises a boundary air cavity, an air injection micropore, an exhaust adjusting structure and an air supply unit. Gas enters the partition boundary area through the gas injection micropores and forms a gas film layer, and the thickness, continuity, stability and coverage range of the gas film layer are changed by adjusting the gas supply pressure, the gas supply flow and the exhaust resistance, so that the thermal coupling strength between the adjacent temperature control partitions is adjusted. The system is suitable for injection molding, pressure casting, hot pressing and composite material forming molds.

The invention discloses a PCB (Printed Circuit Board) processing method for reducing broken needles during drilling of small micropores and a PCB. The PCB processing method comprises the following steps of: classifying all to-be-drilled holes on the whole board according to the drilling diameters of the drilled holes; for the micro holes with the hole diameters not larger than a preset threshold value, the accumulated copper layer thickness needing to be drilled in the machining process corresponding to each hole is counted, and the accumulated drilled copper thickness is obtained; for each type of fine holes, partitioning each hole with the same hole diameter according to the accumulated drilling copper thickness; according to the zoning result, CNC programs used for drilling machine machining are set in a zoning mode; setting the maximum drilling number of the same drill point in each area according to different substrate materials and the accumulative drilled copper thickness; according to different accumulative drilled copper layer thicknesses, the drilling stroke of the high-blade-length micro drill point is split, the types of the drill points and the service life limit times of the drill points can be finely classified, and compared with a traditional machining method, the problem that the drill points are broken and scrapped due to the fact that the service life drill points appear in a high accumulative copper thickness area can be greatly solved.

The invention belongs to the technical field of composite materials, and discloses a basalt-based composite nanomaterial as well as a preparation method and application thereof. According to the invention, ZIF-67 in MOF is innovatively loaded on basalt nanosheets, so that not only can the dispersity and interfacial compatibility of basalt be improved and the sheet layers be prevented from being agglomerated in the coating, but also micropores possibly existing among the nanosheets can be blocked through a porous structure of the basalt, and the shielding effect and the penetration resistance of the whole coating are improved. In addition, the introduction of ZIF-67 endows the composite material with more functional regulation and control possibilities, such as ion capture, intelligent slow release and the like, so that the protection performance of the coating in a complex environment is further enhanced. Compared with a traditional filler, the composite structure has the advantages of being controllable in cost, excellent in performance, environmentally friendly and the like, and a new thought is provided for functional design of a water-borne epoxy resin anticorrosive coating.

The invention discloses a piezoelectric cantilever beam energy collector, and the collector comprises a fixed part 1 which is used for fixing the collector at a certain position; the supporting beam and the fixing piece 1 are connected into a whole, the supporting beam comprises a bionic bamboo joint structure 2 close to one end of the fixing piece 1 and a mass structure 3 far away from one end of the fixing piece 1, and at least one micropore 6 penetrating through the upper surface and the lower surface of the supporting beam is formed in the bionic bamboo joint structure 2 and used for forming alternate rigid segments and flexible nodes on the bionic bamboo joint structure 2; the supporting beam swings with the end close to the fixing piece 1 as the circle center in the vibration environment. The mass block 5 is arranged on the mass structure 3; the number of the piezoelectric films 4 is two, the two piezoelectric films 4 are arranged on the upper surface and the lower surface of the bionic bamboo joint structure 2 respectively, and the piezoelectric films 4 cover the micropores 6 formed in the bionic bamboo joint structure 2.

The invention discloses an HDI plate manufacturing process for a pen electronic camera module, and the process comprises the steps: carrying out the multi-frequency acoustic wave penetration and temperature gradient processing of a substrate, and obtaining the pre-detection data of the substrate; in the laser drilling process, short-pulse multi-frequency acoustic waves and local heat regulation are applied to a target hole area, and micropore acoustic reflection data are obtained; the method comprises the following steps: independently regulating and controlling the temperature of a plurality of areas of a board surface before chemical copper deposition treatment, and recording acoustic scanning data to form a regional acoustic characteristic spectrum; performing acoustic wave excitation according to a preset time interval in the chemical copper deposition process to obtain monitoring data of the copper deposition process; periodic thermal excitation and fluid disturbance are applied in the electroplating process, and electroplating dynamic monitoring data are obtained; after electroplating is completed, temperature circulation and stress excitation treatment are carried out, and the evaluation result of the internal structure of the micro-through hole is obtained. According to the technical scheme, the micro-through-hole structure with the bubble micro-migration tendency can be accurately identified and screened in the manufacturing process, and the long-term reliability and the use stability of the HDI plate are effectively improved.

A sound absorbing device according to an exemplary embodiment of the present invention comprises a plurality of sound absorbing cells arranged adjacent to each other on a plane, and each of the plurality of sound absorbing cells includes: a chamber having a volume therein, and in which a plurality of micro holes is perforated on a front surface in which a sound wave is incident; and a neck part introduced and extended to a rear of the front surface and penetrated by a through hole for communicating the outside and the chamber.

The invention relates to the technical field of laser processing, and discloses a laser processing method of a ceramic substrate, which adopts an ultrashort pulse laser and nanosecond laser dual-laser system process, integrates the advantages of precise surface modification of ultrashort pulse laser and efficient processing of nanosecond laser, and forms a micron-sized porous sacrificial layer on the surface of a ceramic material. Micropores and microcracks on the micron-sized porous sacrificial layer destroy the continuous heat conduction path of the original compact ceramic, and heat is gathered on the micron-sized porous sacrificial layer formed on the surface, so that when subsequent nanosecond laser acts, compared with the original smooth ceramic substrate, the generated cracks are easy to block, two-dimensional cracks are not easy to generate on the surface of the ceramic substrate, and the surface of the ceramic substrate is not easy to crack. And low-power and high-efficiency processing can be carried out on the ceramic material without coating an auxiliary material, and high-absorption and low-heat-influence processing is realized.

According to the large-depth-diameter-ratio micropore laser rotary-cutting precision machining system and method, light beam self-rotation and light beam scanning are achieved through a compact rotating assembly integrating a Dove prism and double reflectors, the off-axis angle and the off-axis amount are precisely regulated and controlled through deflection and movement of the reflectors, light beams are subjected to off-axis focusing through a focusing assembly, and the precision of laser rotary-cutting precision machining is achieved. Finally, a light path focusing mode of first converging and then off-axis focusing is formed, large-depth-diameter-ratio micropore machining is achieved, the aperture range is dozens of micrometers to several millimeters, and the maximum depth-diameter ratio can reach 15: 1 or above; the device is compact in structure, a complex adjusting system is not needed, the control mode is simple, high rotating speed can be achieved, ultra-short pulse time domain broadening is reduced through the double-reflector system, and machining of hole patterns such as steep straight holes and taper holes can be achieved.

The invention provides a multi-energy-field auxiliary laser drilling method and device for a silicon carbide micropore with the large depth-diameter ratio, and relates to the technical field of hard and brittle material precision machining.The multi-energy-field auxiliary laser drilling method for the silicon carbide micropore with the large depth-diameter ratio comprises the following steps that a silicon carbide workpiece is ablated layer by layer through an ultrafast laser beam to form the micropore; and in the layer-by-layer ablation process, the workpiece or the ultrafast laser beam generates relative high-frequency micro-amplitude ultrasonic vibration in the axial direction of the micropore, and the low-temperature high-speed air flow is coaxially guided to an ablation point of the ultrafast laser beam so as to remove ablation products and cool the ablation point and the adjacent area of the ablation point. Through organic combination and synergistic effect of ultrafast laser ablation, ultrasonic vibration in the axial direction of a drill hole and coaxial low-temperature high-speed airflow, the problems that in the prior art, due to unsmooth chip removal of ablation products and the remarkable heat effect, the machining depth is limited, the hole wall quality is poor, and the machining efficiency is low are solved.

The invention discloses a multifunctional foam pad made of a regenerated composite material and a production process of the multifunctional foam pad, and belongs to the technical field of production of regenerated composite materials. The surface of the recycled PET non-woven fabric printing layer is provided with 50 + / -5 [mu] m micropores, the cat palm bionic gradient foaming layer (the density is 0.15-0.35 g / cm < 3 > gradient distribution) is formed by blending and foaming PVC recycled materials, PET bottle chips and waste rubber powder, and the glass fiber net reinforced rubber matrix layer and the triangular pyramid micro-sucker bottom layer are arranged from top to bottom. The preparation process comprises the steps of waste material near-infrared sorting and pretreatment, multi-stage dynamic blending granulation, supercritical CO2 gradient foaming, bionic calendaring forming and laser positioning hot-pressing compounding, high-valued utilization of multi-element waste materials is achieved through combination of bionic structure design and a green process, the product has sound insulation, buffering and anti-skid performance, the tear resistance is improved by 150%, and the service life of the product is prolonged. The problems that a traditional foaming cushion depends on raw plastic, is single in function and causes manufacturing pollution are solved, and resource circulation and function strengthening unification are achieved.

The invention discloses a piezoelectric ceramic-based single droplet generation device, which comprises a microcavity liquid chamber, a piezoelectric driving assembly, a micropore nozzle, a hydraulic adjusting system and an electric control driving module, the bottom of the microcavity liquid chamber is provided with a nozzle interface, and the volume of the internal cavity is adaptive to trace liquid storage and pressure transmission; the piezoelectric driving assembly comprises a piezoelectric ceramic element which is connected with the micro-cavity liquid chamber in a bonding manner and is used for generating deformation under the driving of an electric signal so as to apply pulse pressure to liquid in the liquid cavity; the micropore nozzle is detachably connected to the bottom of the liquid chamber, the diameter of a spraying hole is adjustable, and the micropore nozzle is used for controlling the initial size of liquid drops; the electric control driving module comprises a power supply, a driving circuit and a controller, is used for outputting an adjustable electric signal to cooperatively control the voltage amplitude, the pulse width and the trigger frequency of the piezoelectric driving assembly, and is linked with the hydraulic adjusting system to realize multi-parameter regulation and control of the droplet size; according to the invention, through cooperation of the piezoelectric driving assembly and the electric control module, high-precision liquid drop control is realized.

The invention discloses a detachable soft gasket and method for thin plate grinding deformation control. The soft gasket structurally comprises a friction adsorption enhancement layer, a micropore vibration reduction layer and an elastic supporting layer which are detachably connected in sequence from top to bottom. In the soft gasket, the elastic supporting layer provides flexible buffering, the micropore vibration reduction layer absorbs machining vibration through a closed-cell micropore structure, the friction adsorption enhancement layer enhances the adsorption force and stability through non-uniform waveform raised grains and conical grooves, the bottom of the friction adsorption enhancement layer is designed in a sealed mode, grinding fluid permeation is effectively prevented, and all the layers cooperate with one another to improve the machining precision. The soft gasket is designed to be of a multi-layer structure, machining deformation is effectively reduced by providing a positioning reference, and the problems of initial deformation, end face jumping and planeness out-of-tolerance of the thin plate caused by a traditional rigid fixing or adsorption mode can be remarkably solved.

The invention discloses a thin-wall sweating cooling structure and an application method thereof. The sweating cooling structure is composed of a plurality of sweating units arranged in an array mode. Each sweating unit sequentially comprises a flow distribution layer, a pressure control layer and a porous sweating surface from bottom to top. The flow distribution layer internally comprises a sweating working medium inlet and a main flow channel for distributing flow; the sweating working medium inlet and the main runner are shared by the sweating units which are arranged in an array manner; the pressure control layer internally comprises a branch flow channel for distributing flow, a porous medium pressure control structure and a buffer area, the branch flow channel is connected with the main flow channel, and the porous medium pressure control structure is arranged parallel to the sweating wall surface; the porous sweating surface is composed of a plurality of sweating micropores and a non-permeable solid wall surface, and the number, the size and the angle of the sweating micropores can be adjusted according to flow regulation and control requirements. The structure has the remarkable characteristics that the structure thickness is small, the sweating flow distribution can be adjusted at will, the porous array structure on the sweating surface can be adjusted at will, and the use efficiency of the sweating working medium is high.

The invention relates to an automobile part cold stamping detecting and forming system which comprises a lower die, a plurality of pressure measuring micro holes are formed in the positions, corresponding to the corners of a special-shaped part, of the lower die, and a pressurizing mechanism for introducing pressurizing gas into the pressure measuring micro holes and an air pressure sensor for detecting air pressure changes are arranged outside the lower die; a punching die; forming a stock mold; the distance adjusting mechanisms are provided with first strokes, second strokes and additional strokes, and when the distance adjusting mechanisms are in the first strokes, the punching heads can penetrate through the stock dies to conduct punching; in the second stroke, the punching head does not completely penetrate through the shaping die; and the correcting controller is configured to control all the distance adjusting mechanisms to be adjusted to the second stroke and control the corresponding distance adjusting mechanisms to be adjusted to the additional stroke when the air pressure change detected by any air pressure sensor exceeds a preset value, and then the distance adjusting mechanisms are slowly recovered to the second stroke. The device can automatically detect the bad gap condition of the special-shaped part of the stamping part and control the shaping mold to slightly tilt for secondary shaping, so that the corner springback phenomenon of the special-shaped part of the stamping part is improved.

The invention discloses a lightweight composite material for buildings and a preparation method thereof. The composite material is prepared from the following raw materials: nano cellulose whiskers, expansible graphite, thermoplastic polyurethane, polystyrene foam particles (or polylactic acid-based degradable microspheres), a compatilizer, an auxiliary agent, a chemical foaming agent, a polylactic acid (PLA) nano-scale degradable template and the like. The preparation method comprises the specific steps of raw material pretreatment, mixing, macropore generation, micropore introduction, template use, template removal, molding processing and the like. According to the preparation method of the composite material, a multi-scale pore structure is constructed, macropores serve as a main frame to bear main loads while the weight of the material is reduced, micropores effectively disperse stress concentration, meanwhile, low density is maintained, and good balance of light weight and high strength is achieved. Meanwhile, the multi-scale porous structure has the advantages of being light in weight, high in strength, good in heat insulation and sound insulation performance, environmentally friendly, degradable and the like.

The invention belongs to the technical field of tungsten filament wire drawing equipment, and particularly relates to automatic tungsten filament wire drawing equipment and a tungsten filament cold drawing method.The automatic tungsten filament wire drawing equipment comprises a rack, a pay-off roller, a first cone pulley, a lubricating liquid water tank, a second cone pulley and a take-up roller are installed on the rack, and a wire drawing die is installed in the lubricating liquid water tank; lubricating pressing plates are installed in the lubricating liquid water tank and distributed on the left side and the right side of the wire drawing die in pairs. The lubricating pressing plate comprises a fixed plate and a movable plate, the fixed plate is fixedly installed on the bottom face of the lubricating liquid water tank, an adjusting screw rod and a rotating disc are installed on the movable plate, and contact rods are installed on the fixed plate and the movable plate; micropores are formed in the lubricating pressing plate; a tank cover is mounted on the lubricating liquid water tank; the tungsten wire drawing device is simple in structure, tungsten wires are positioned and restrained through the lubricating pressing plate, the position of the wire drawing die is adjusted, the tungsten wires coincide with the center line of the die hole, and the situation that the tungsten wires shake and flutter, and consequently the wire drawing die is subjected to unilateral abrasion is avoided.

The invention discloses a composite metal shell and a manufacturing method thereof. The manufacturing method of the composite metal shell comprises the following steps: providing a first metal base material; the first metal base material is subjected to hot forging machining to form a metal inner shell, the metal inner shell comprises a main body and a boss, and the boss protrudes from the main body; performing chemical micropore etching on the metal inner shell; a shell metal layer comprising second metal is formed on the side, provided with the boss, of the main body through die casting, and the boss is embedded in the shell metal layer; a groove is formed in the side, away from the boss, of the main body, and the groove penetrates through the main body and extends into the boss. In the composite metal shell provided by the invention, the groove can avoid the junction of the metal inner shell and the metal layer of the outer shell, so that a chemical film with uniform thickness can be formed on the inner wall of the groove in a chemical process, the composite metal shell can be effectively protected, and the probability of corrosion at the groove is reduced.

The utility model belongs to the technical field of food preservation, and particularly relates to an alcohol bag for food preservation. The alcohol fresh-keeping material comprises a front-side wrapping material, a back-side wrapping material and an alcohol fresh-keeping material body, a middle reserved cavity is formed by the front-side wrapping material and the back-side wrapping material in a peripheral hot-pressing mode, and the middle reserved cavity is filled with an alcohol fresh-keeping material body. The surface of the front surface wrapping material is provided with breathable micropores. Ventilation micropores are formed in the back surface wrapping material. The ventilation micropores are conical holes, and the taper can be adjusted so as to assist in controlling the volatilization speed of the alcohol. Each of the front-side wrapping material and the back-side wrapping material is composed of a high-temperature-resistant printing layer, a composite connecting layer and a heat sealing layer. The alcohol fresh-keeping material body is a pure liquid or a colloidal mixture or particles. The packaging film formed by extruding macromolecules ensures that the packaging film is air-permeable and liquid-impermeable, the volatilization speed is adjustable, the situation that the taste of food is affected by overhigh local alcohol concentration is not easily caused, and meanwhile, the food can be kept fresh for a long time.

The invention belongs to the technical field of ceramic matrix composite material laser processing, and discloses a ceramic matrix composite material component large depth-diameter ratio micropore long pulse laser processing method, which comprises the following steps: cleaning the surface of a pretreatment component, and finishing initial alignment of processing; then drilling in three stages: in the first stage, using a first group of parameters to make a laser focus defocus, and releasing a preset pulse; in the second stage, the pulse width and frequency are kept unchanged, the laser power is maintained, the focus is adjusted to be zero defocus, and the pulse is released; and in the third stage, the first two parameters are kept unchanged, the laser power is reduced, the focus is adjusted to be negative defocus, and the pulse is released. And repeating the preset times according to the depth-diameter ratio requirement, and finally cleaning impurities at the orifice. The invention aims to solve the problems of low processing efficiency and precision caused by complex film hole angle, small hole diameter and large depth-diameter ratio of a ceramic matrix composite component.

The invention provides an ultrathin broadband sound absorption composite structure which comprises a plurality of silencing units, every two of the silencing units are in contact with each other on the same plane to form the three-dimensional ultrathin broadband sound absorption composite structure, each silencing unit comprises a shell, a through hole is formed in each shell, and the through holes are communicated with the silencing units. A thin film is arranged in the position, located in the center of the three-dimensional ultra-thin broadband sound absorption composite structure, of the shell, a micro-pore plate is arranged in the position, located on the periphery of the three-dimensional ultra-thin broadband sound absorption composite structure, of the shell, and the micro-pore plate or the thin film or other resonance structures are arranged in the micro-pore plate or the thin film or other resonance structures in the micro-pore plate or the thin film or other resonance structures. The ultra-thin broadband sound absorption composite structure provided with the micropore plate and the thin film is small in size, the thickness of the ultra-thin broadband sound absorption composite structure is 1 / 23 of the sub-wavelength size, the ultra-thin broadband sound absorption composite structure has the ultra-thin characteristic, the sound absorption frequency band is wide, the noise reduction effect is good, and the ultra-thin broadband sound absorption composite structure can be suitable for sound absorption and noise reduction of various small places and spaces.

The invention discloses a plate-formwork composite sound absorption structure and a building wall surface of a transformer substation. Relates to the field of sound absorption structures, and the structure comprises a microwell plate which is provided with a plurality of first through holes; a plurality of second through holes are formed in the microporous film, the microporous film is attached to the microporous plate, the second through holes are smaller than or equal to the first through holes, and the second through holes are communicated with the first through holes. According to the invention, the technical problem of low use flexibility of the sound absorption structure caused by the sound absorption effect of the sound absorption structure based on the microplate in the related art is solved.

The invention discloses a preparation process of a fine-spacing ordered dense-arrangement porous needle plate. The preparation process comprises the following steps: designing a three-dimensional model of a needle plate mold, reserving hole site marking points, setting laser processing parameters according to the characteristics of selected materials and the precision of the required mold, filling selected metal powder, and manufacturing a needle plate mold blank through a 3D metal printing technology; according to the performance requirements of the selected materials, the needle plate mold blank is subjected to heat treatment; and a machine vision system is used for recognizing reserved hole site mark points and correcting positioning deviation, different laser machining parameters are selected according to the surface quality grade of the mold, fine machining of the inner surface of a micropore is achieved through the laser technology, and the high-quality needle plate mold is obtained. The invention further discloses a porous needle plate mold. By adopting the device and the method, the problems of difficulty in positioning, low machining efficiency, non-uniform hole distribution, overlarge hole pitch, rough hole wall and the like during micropore machining are solved, and efficient preparation of the high-precision needle plate mold with numerous micropores, small hole pitch and ordered arrangement of the micropores is successfully realized.

The invention provides a low-damage CFRP laser drilling device and method based on dynamic multi-mode light beam regulation and control. The CFRP laser drilling device comprises an ultrafast laser source, a dynamic light field regulation and control module, a double-pulse regulation and control module, a galvanometer scanning module, a motion module and a controller module, the ultrafast laser source, the dynamic light field regulation and control module, the double-pulse regulation and control module and the galvanometer scanning module are arranged on the same light path, and the motion module is used for bearing a workpiece to be machined. The controller module is connected with the ultrafast laser source, the dynamic light field regulation and control module, the double-pulse regulation and control module, the galvanometer scanning module and the motion module. According to the method, the energy density can be accurately regulated and controlled in a microsecond-level time domain and a micron-level space range, so that the CFRP microporous structure with low heat influence, high consistency and high geometric accuracy is prepared, the stability and reliability of the machining process are effectively improved, and the requirement for micropore precision machining in the fields of aerospace and precision manufacturing is met.

The invention provides a production method of a composite sound absorption suspended ceiling suitable for an airport terminal, and belongs to the technical field of composite sound absorption suspended ceilings. The production method comprises the steps that firstly, the propagation mechanism of sound waves in a composite material is analyzed, the material parameter range required by the optimal sound absorption effect is calculated, the parameter space is divided into six areas, and clustering center points are extracted to make an experiment sample plate; through a sound absorption performance test in an airport terminal environment, multi-band sound wave reflectivity, a micro-vibration spectrum and a sound energy attenuation curve are measured and arranged into an eight-dimensional sound absorption vector matrix. And training the sound absorption parameter effect model. The model is used for carrying out increasing and expanding sampling on material parameters, a large number of parameter combinations and prediction performance are generated, the parameter combinations with the optimal multi-band comprehensive sound absorption effect are screened out, the parameter combinations comprise the micropore aluminum plate with the hole diameter being 0.5 mm, the hole pitch being 15.6 mm and the punching rate being 8%, and finally the micropore aluminum plate and through hole ceramic composite sound absorption suspended ceiling production aiming at the terminal noise characteristics is achieved.

The invention relates to the technical field of silicon nitride ceramic trepanning, in particular to a femtosecond laser trepanning method and device for silicon nitride ceramic. The invention discloses a femtosecond laser trepanning method for silicon nitride ceramics. The method comprises the following steps: pre-preparation work; the fixed silicon nitride ceramic substrate is holed based on a three-stage scanning strategy, and the effective depth of field is constrained by the Rayleigh length; the three-stage scanning strategy is as follows: S1, low-energy grooving; s2, high-energy multiple cutting; s3, performing low-energy stroke trimming; annular feeding is executed according to a preset two-dimensional hole site vector path during scanning in each stage of the three-stage machining process. According to the method, high-quality and high-controllability micropore array processing can be realized on the silicon nitride ceramic substrate, and the method has wide engineering application value.