17 results about "Laser micromachining" patented technology

The invention discloses an additive manufacturing intelligent repairing and surface optimizing method for a complex special-shaped curved surface, and particularly relates to the technical field of additive manufacturing. A three-dimensional digital model is obtained, and a complex special-shaped curved surface defect area is recognized; extracting a local morphology parameter set; constructing a repair path generation model based on a graph neural network, and performing collaborative optimization of forming precision, residual stress and deposition stability on the path through a multi-objective optimization algorithm; additive manufacturing equipment is controlled to perform material deposition according to the optimized path; carrying out online error detection by adopting a structured light system, judging repair quality through a fuzzy decision tree model, and triggering path reconstruction if the repair quality exceeds a threshold value; after repairing is completed, surface micro texture factors are extracted, and functional texture regulation and control are conducted through the laser micromachining technology; according to the method, high-precision intelligent repair of the complex curved surface area and collaborative improvement of surface function performance are achieved, and the method is suitable for the fields of aerospace, energy, high-end equipment manufacturing and the like.

Embodiments of methods and systems for liquid-assisted laser micromachining of a substrate are provided. A laser beam of a laser is directed at a substrate disposed in a liquid-assist medium. The substrate has a first major surface, a second major surface, and a body extending from the first major surface to the second major surface. The liquid-assist medium at least partially covers the second major surface. A focal point of the laser beam is moved along a path through the body from the second major surface toward the first major surface. The body of the substrate is removed along the path to define a cavity. The liquid-assist medium has a surface tension, and the laser pulses the laser beam at a repetition rate (F), in kHz, based on the surface tension (σ), in dyn / cm, according to F = [3.52 + 0.085σ + 0.002e 0,21(σ-37.8)] ± 0.8.

The invention relates to a countersink blade, a countersink and a manufacturing process of the countersink blade, and belongs to the field of countersinks, the countersink blade is provided with a cutting edge part, the cutting edge part is provided with a row of sawteeth, and the tooth bottoms and the tooth tops of the sawteeth are subjected to rounding treatment; the surface, facing a workpiece, of the blade in the machining process is constructed to be a first inclined face, and a row of sawteeth are located on the first inclined face. And the blade is made of PCD (Polycrystalline Diamond). The countersink blade is provided with the sawteeth, so that the countersink can machine high-precision concentric lines on the end face of a hole at a time, the machining efficiency and quality of the concentric lines are greatly improved, the stability and consistency of the concentric lines are good, and the assembling quality of bolt connecting pieces in the later period is guaranteed; the method has the advantages that the structure is simple, the blade roughness can be customized according to customer requirements, the differentiated machining requirements are met, the microcosmic sawtooth shape of the countersink blade is accurately designed by matching with the laser micromachining technology, and the high-precision concentric line structure and the high-precision and long-life cutting performance are formed.

The invention provides a metal material deformation localization evolution characterization method based on image processing, which comprises the following steps: (1) etching grid lines on the surface of a metal material sample by using a laser micromachining technology, and carrying out high-speed impact loading on the sample to be tested after laser micromachining, recording an original image of grid line deformation on the surface of the to-be-detected sample by using a high-speed camera; (2) carrying out filtering and noise reduction processing on the obtained original image with the deformed grid lines, and selecting and identifying the grid lines; (3) extracting coordinates of each pixel point of the grid lines, and performing polynomial fitting on the coordinates of the pixel points to obtain displacement of each point of the grid lines; and (4) performing first-order derivative derivation on the polynomial obtained by fitting to obtain a whole-process image of deformation localization evolution of the surface of the sample to be detected. The method is simple and easy to operate, automatically recognizes and extracts feature points, does not need complex parameter setting, is high in result accuracy, and can visually and efficiently obtain deformation field information under the high-speed impact condition.

Optical assembly for generating the second and third harmonic frequencies of a laser beam using two optically nonlinear crystals (C1 and C2) placed in a temperature-controlled environment. The first optically nonlinear crystal (C1) converts the fundamental harmonic frequency to the second harmonic, while the second optically nonlinear crystal (C2) converts the fundamental and second harmonics to the third harmonic. The system includes beam intensity attenuation mechanisms using a first half-wave plate (HWP1) and first and second polarizers (P1, P2) that direct the beam according to the user's requirements. Motorized linear shifts (T1, T2) provide switching between harmonic frequency generation modes. Different cuts of the optically nonlinear crystals (C1 and C2) allow for optimization of phase matching and conversion efficiency. This assembly is designed for highly accurate and flexible generation of harmonic laser beams with wide industrial applications, especially in laser micromachining.

The invention discloses a regenerative amplifier based on a slab medium and a double-end pumping configuration, and belongs to the technical field of laser technologies and photoelectric devices. The regenerative amplifier comprises a seed source, a modulator, an amplifier, an isolator, a polarization control element, an electro-optic Q-switched crystal, a slab laser crystal, a double-end pumping system and a resonant cavity structure. The amplifier adopts the lath gain medium, heat sinks are bonded on the upper surface and the lower surface to improve the heat dissipation efficiency, the pump light is uniformly distributed in the crystal in combination with a double-end symmetric pumping mode, and the energy utilization rate and the light beam quality are improved. Seed light reciprocates in the resonant cavity for multiple times, and after multi-pass amplification and energy accumulation, cavity emptying is achieved through electro-optical Q-switching control, and high-peak-power laser pulses are output. The problems that a traditional regenerative amplifier is serious in heat effect, uneven in gain, limited in output power and the like are effectively solved, and the regenerative amplifier is suitable for the high-energy laser application fields such as laser micromachining and ultrafast spectrums.

This invention belongs to the field of laser micromachining and relates to a coaxial monitoring system for ultrafast laser micromachining. The system includes an ultrafast laser, a beam-splitting plate, a laser focusing lens, an intermediate lens group, a filter, a fixed-magnification telecentric lens, and a high dynamic range camera. The ultrafast laser emits ultrafast laser light. The beam-splitting plate and the laser focusing lens are arranged sequentially from front to back along the optical path of the ultrafast laser. The laser focusing lens focuses the ultrafast laser light onto the workpiece, generating visible monitoring light on the workpiece. The visible monitoring light passes through the laser focusing lens and is reflected by the beam-splitting plate to form reflected visible monitoring light. The intermediate lens group, filter, fixed-magnification telecentric lens, and high dynamic range camera are arranged sequentially from front to back along the optical path of the reflected visible monitoring light. This invention provides a coaxial monitoring system for ultrafast laser micromachining that improves imaging clarity and resolution.

The invention belongs to the technical field of water-jet guided laser micromachining, and particularly discloses a miniature water-jet guided laser machining head which comprises a laser emitting and collimating assembly used for generating laser beams and collimating the laser beams into parallel beams; the polarization regulating and focusing assembly is used for regulating the polarization state of the parallel light beams and focusing the regulated parallel light beams; the water-guided coupling assembly is used for coupling the focused parallel light beams and the micro water jet to form water-guided laser beams for processing and reflecting the water-guided laser beams to form reflected laser beams; and the reflected light monitoring assembly is used for monitoring the coupling state of the water-guided laser beam in real time based on the reflected laser beam. Miniaturization of an existing water-jet-guided laser machining head can be achieved, and the water-jet-guided laser machining head can be separated from a machine tool to be independently used.

The invention discloses an integrated four-wire system test probe based on an electroforming process and a preparation method thereof.The test probe comprises a middle insulating layer and metal conductors symmetrically distributed on the two sides of the middle insulating layer, and conductive seed layers are arranged on the outer surfaces, close to the two sides of the metal conductors, of the middle insulating layer; the projections of the middle insulating layer and the metal conductor on the horizontal plane coincide, the metal conductor and the middle insulating layer are integrally formed through an electroforming process, the middle insulating layer adopts an ultrathin flexible insulating film, the metal conductor adopts metal alloy with high strength, high wear resistance and good conductivity, and the middle insulating layer is one of polyimide, polyethylene naphthalene or polyester. According to the invention, an electroforming technology and laser micromachining are combined to manufacture the integrated four-wire system test probe with micron-order precision, the integrated four-wire system test probe can be directly inserted into a female terminal, stable and reliable double-point contact is realized, and the application bottleneck of a four-wire method in female terminal test is solved.

The invention discloses a super-hydrophobic surface based on laser micromachining and UV transfer printing and a preparation method thereof, and belongs to the field of material surface modification.The method comprises the steps that a microstructure template is machined on a high-purity metal nickel plate through picosecond or femtosecond laser, a microstructure is copied to the surface of a target base material with high precision through a circulating UV transfer printing technology, and the super-hydrophobic surface is obtained. Large-area splicing larger than 500 mm * 500 mm is achieved, finally, low-surface-energy nano particle dispersion liquid is sprayed, and a micro-nano graded rough structure is constructed after drying. The static water contact angle of the prepared super-hydrophobic surface is larger than or equal to 150 degrees, the rolling angle is smaller than or equal to 5 degrees, and the contact angle attenuation rate lt after the super-hydrophobic surface is abraded by 600 # abrasive paper 500 times; the coating has excellent mechanical durability, chemical stability and self-cleaning, anti-icing and anti-fouling functions, and is simple in process, low in cost and suitable for industrial large-scale production.

The invention relates to the technical field of laser micromachining, in particular to a method for improving the depth of a femtosecond laser double-beam interference machining super-diffraction limit nano grating, which comprises the following steps of: emitting fundamental frequency femtosecond laser through a femtosecond laser light source; splitting the fundamental frequency femtosecond laser into two paths of coherent light beams, and enabling the two paths of coherent light beams to form an interference pattern with a first period on the surface of the sample; controlling the sample scanning speed to meet a preset relational expression between the sample scanning speed and the repetition frequency of the first period and the fundamental frequency femtosecond laser; part of the fundamental frequency femtosecond laser is converted into frequency-doubled light, the frequency-doubled light generates a frequency-doubled pulse string through a Fabry-Perot resonant cavity, and the frequency-doubled pulse string irradiates the surface of a sample at preset energy flux density and preset sub-pulse time intervals after preset delay time and coincides with an interference pattern area. Therefore, the processing structure meets space phase matching conditions, surface plasmon polariton resonance is excited, and the depth is remarkably improved.

A method of processing a substrate includes disposing the substrate into a liquid-assist medium such that the substrate is in an orientation that is within ten degrees of vertical. The substrate is attached to a mount assembly comprising a window-substrate and one or more spacers located at a surface of the window-substrate. The substrate is attached to the one or more spacers such that a gap is present between a first surface of the substrate and the surface of the window-substrate. The liquid-assist medium is present within the gap and at a back surface of the substrate. The method further includes directing a pulsed laser beam to form a focus spot having an initial position in the liquid-assist medium behind the back surface, and moving the focus spot through a body of the substrate to create a modification that forms a feature.

The invention discloses a three-sandwich type piezoelectric actuator opposite arrangement type multi-dimensional vibration platform and an excitation method thereof, and belongs to the technical field of precision driving and micro vibration control, the platform comprises a tail end platform and three actuating units, the actuating units are distributed around the tail end platform in a circumferential opposite and mirror symmetry mode, and the whole structure is flat and compact. Each actuating unit is formed by connecting a flexible hinge, an amplitude-change pole, a piezoelectric actuator, an end cover and a bolt in series, and reliable pressure stress is provided through bolt pre-tightening. The six-degree-of-freedom high-frequency micro-vibration output device is characterized in that only phase collaborative excitation of the bending vibration ceramic group around the Y axis and the bending vibration ceramic group around the Z axis is utilized, three-direction translation along the X / Y / Z axis and three-direction rotation around the X / Y / Z axis can be achieved without a longitudinal vibration mode, and six-degree-of-freedom high-frequency micro-vibration output is achieved. The support is arranged in a modal node area to reduce interference, and the rigidity of the flexible hinge is adjustable to adapt to different working conditions. The platform is particularly suitable for space-limited and high-precision application scenes such as endoscopic instruments, micro-fluidic chips, laser micromachining and omni-directional active vibration suppression.

This invention provides a magnetic field-assisted laser texturing method and apparatus, belonging to the field of laser micromachining. Addressing the problems of poor controllability of texture morphology and susceptibility to metallurgical defects in existing laser texturing methods, this invention applies a controllable magnetic field to the laser processing area. The Lorentz force exerted by the magnetic field on the molten metal in the molten pool influences its flow behavior. By adjusting the strength, direction, and / or alternating frequency of the magnetic field, the height of the texturing protrusions or the depth of the pits, as well as the mechanical properties, can be actively controlled. Furthermore, a quantitative formula relating magnetic induction intensity to morphological characteristics is established. This invention is simple to operate, low in cost, and can significantly improve the consistency of surface texture and the mechanical properties of materials.

This invention provides a laser micromachining system and method. The laser micromachining system includes a laser, a beam expander, a half-wave plate, a one-dimensional aperture stop (AOD), a slit stop, a Dowell prism, a 4f imaging system, and a focusing lens for processing. The laser emits a laser beam; the beam expander expands and collimates the laser beam output from the laser; the half-wave plate adjusts the polarization direction of the incident light; the one-dimensional AOD diffracts the incident laser; the slit stop filters out unwanted diffracted light; the Dowell prism controls the rotation of the outgoing light; the 4f imaging system images the light field distribution from the exit surface of the Dowell prism onto the entrance pupil of the focusing lens; and the focusing lens focuses the laser beam into a focal spot that acts on the processing surface of the sample. This laser micromachining system and method solves the problems of complex structure, difficult control, and low diffraction efficiency in two-dimensional AOD systems, achieving high-speed, high-precision, and adjustable aperture processing of micro-holes.

According to the alloy-inlaid steel plate drill and the efficient precision manufacturing method thereof, a three-order chip division type cutting edge structure is adopted, layered cutting is achieved under the synergistic effect of an inner edge, a middle edge and an outer edge, a micro-groove array formed through laser machining on the surface of a drill body is matched, the brazing bonding strength is remarkably improved, the chip removal path is optimized, and the chip removal efficiency is improved. A high-precision micro-groove network is constructed on the surface of the drill body through a laser micromachining technology, and an anchoring foundation is provided for subsequent welding; the precise manufacturing process covers key process innovation: the angle tolerance of a cutting edge is ensured to be less than or equal to + / -0.5 degrees and the margin run-out is ensured to be less than or equal to 0.02 mm through five-axis linkage grinding, and a micro-arc cutting edge is molded by a magnetic nano passivation technology to reduce cutting vibration. According to the scheme, the technical bottlenecks of chip removal blockage, blade falling and short service life of a traditional steel plate drill are solved, and the manufactured drill bit has high cutting efficiency, excellent wear resistance and excellent process stability.

This invention relates to a method for optimizing ultrafast laser micromachining parameters based on causal enhancement modeling, comprising the following steps: S1, constructing a multi-dimensional dataset for ultrafast laser micromachining and performing hierarchical filtering; S2, mining the dynamic causal relationship between processing parameters and quality indicators and quantifying the causal effect; S3, constructing a dynamic causal enhancement-based micromachining quality prediction surrogate model; S4, establishing a multi-objective particle swarm optimization algorithm with quality priority to optimize processing parameters; S5, experimental verification and iterative parameter optimization. The method provided by this invention achieves intelligent, efficient, and precise optimization of laser processing parameters by constructing a surrogate model with dynamic causal feature fusion and combining it with a multi-objective particle swarm optimization algorithm with quality priority, thereby improving the consistency and stability of micro-hole processing quality.