16results about How to "Reduce laser power" patented technology

The invention relates to a preparation method of a V-containing high-performance aluminum alloy material for additive manufacturing, which is characterized by comprising the following steps of: (1) preparation of a composite material: adding a metal vanadium element into aluminum alloy powder containing copper and magnesium elements or aluminum alloy or pure aluminum powder added with the copper and magnesium elements to prepare original alloy powder; the main component of the original alloy powder is AlCuMgV; the content of the vanadium element is 1.8 to 3.5 weight percent; and (2) selective laser melting forming.

The invention discloses a preparation method and application of a composite 3D negative electrode current collector for a lithium metal battery, and belongs to the field of batteries, and the preparation method comprises the following steps: firstly, introducing a reduced graphene oxide artificial interface layer on the surface of the current collector through a chemical coating means, so that the reduced graphene oxide artificial interface layer and the current collector are tightly combined and are not easy to fall off after being bent due to chemical reaction in the process; and the conductivity and the ductility of the coated current collector are not greatly damaged. Then, on this basis, a three-dimensional micro-pit array structure with a lithium-loving oxide layer is introduced on the surface of the current collector by means of laser etching, so that the specific surface area of the current collector is increased, the surface current density distribution is adjusted, lithium metal is effectively induced to be uniformly deposited on the macro-scale and the micro-scale, and formation of lithium dendrites is inhibited; the lithium copper half battery assembled by the current collector has excellent cycle performance. The preparation process flow is simple, the composite 3D current collector with excellent performance is prepared, the cost is effectively reduced, and the production efficiency is improved.

The invention discloses an all-optical tuning controllable optical comb generation method based on a functionalized echo wall mode optical micro-bottle cavity. Comprising a 1550nm narrow linewidth continuous wave laser, a single-mode fiber, an erbium-doped fiber amplifier, a polarization controller, an optical isolator, a functionalized micro-bottle cavity-fiber taper coupling system, an optical attenuator, a spectrum analyzer and a 1550nm power tunable laser. The free spectral range of the microcavity is reduced by utilizing the unique axial characteristic of the echo wall mode microbottle cavity, the axial mode microcavity optical frequency comb with the small free spectral range is generated, the functionalized microbottle cavity is prepared based on an all-optical tuning method, and the generated axial mode microcavity optical frequency comb is tuned through the photo-thermal material titanium dioxide, so that the optical frequency comb with the small free spectral range is obtained. And remarkable spectral range tuning is realized. The limitation that the WGM microcavity optical frequency comb cannot be effectively tuned due to a large free spectral range is solved, and practical application of the microcavity optical frequency comb in the fields of optical communication, optical frequency synthesis and the like is facilitated.

The invention discloses a method for regulating and controlling the forming quality of an LPBF nickel alloy inclined thin-wall structure, and the method comprises the following steps: S1, selecting different laser powers to carry out first LPBF printing, and printing thin-wall structures with different inclination angles; s2, measuring the lower surface roughness and density of all the samples, and recording the corresponding laser power with the lowest lower surface roughness and the highest density; s3, a prediction model is constructed, optimal process parameters of other inclination angles are obtained through machine learning, and an inclined thin wall forming quality database is formed; and S4, the optimal laser power is obtained according to the prediction model, and second-time LPBF printing is conducted according to the optimal laser power. The problem that the quality of the lower surface of the nickel alloy inclined thin-wall structure prepared through LPBF is poor can be solved, cost is low, efficiency is high, and practicability is high.

The invention relates to a method for changing processing parameter values when performing a beam processing method, comprising the following steps: changing, preferably manually, a forward speed of the beam processing method with respect to a predefined forward speed; and varying a value of a second processing parameter with respect to a predefined value of the second processing parameter for the beam processing method and according to a change in the forward speed. The invention also relates to a beam processing system and a computer program product for implementing the method.

The invention discloses a laser hybrid welding method for butt joint of plates with different thicknesses, which comprises the following steps of: preheating base metals and / or reducing the gap between the base metals by moving along the length direction of the gap between the base metals under the guidance of a TIG (Tungsten Inert Gas) welding gun, and welding the base metals of which the gap is reduced by moving a laser welding head along the length direction of the gap, meanwhile, the MAG welding gun moves in the length direction of the gap to weld the base metal subjected to laser welding, the gradient of the connecting position of the plates with the different thicknesses is reduced, in the moving process of the laser welding head, two servo motors in the laser welding head drive two reflectors to swing to change the propagation path of laser, and the laser welding is completed. And the laser swings on the two sides of the gap between the to-be-welded base metal in a reciprocating mode, the power of the laser is changed according to the plate thickness of the base metal, and the swing amplitude of the laser is determined according to the width of the gap. The gradient power mode enables the weld penetration depth to be more uniform, heat input to be smaller, laser power to be changed, and the problems of incomplete fusion, incomplete penetration or burn-through in the prior art are solved.

The invention relates to the technical field of brazing material processing, in particular to nearly-spherical particle brazing filler metal and a processing method and device thereof. The processing method of the nearly spherical particle brazing filler metal comprises the following steps: pre-cutting a brazing filler metal wire into a shape similar to a bean pod, coating a laser absorption coating at a notch connecting part formed by pre-cutting, and fusing the notch connecting part by adopting laser, so as to obtain the nearly spherical particle brazing filler metal. According to the method, mechanical pre-cutting is adopted, meanwhile, the high-energy absorption graphite coating is coated at the notch connecting position, the laser generator is additionally arranged at the rear end to melt the filaments to form the nearly-spherical brazing filler metal, the number of used equipment is small, energy consumption is low, efficiency is high, the material utilization rate is high, loss is basically avoided, the size of the nearly-spherical brazing filler metal is easy to control, and uniformity is good.

The application provides a laser cutting optimization method and system for batch production of flexible tactile sensors. The method includes: obtaining flexible material characteristic data, configuring an ultrafast laser cutting unit and a thermal annealing laser unit; generating plasma through a plasma generator to improve laser energy absorption efficiency; collecting cutting process parameters and estimating cutting state; dynamically adjusting cutting beam, thermal annealing beam and plasma parameters; evaluating cutting quality and selecting or reconstructing control strategy; realizing simultaneous cutting and post-processing of multiple sensor units. By combining multi-beam laser collaborative cutting with plasma assisted technology, using a distributed unknown input observer and an intelligent control system, the application solves the problems of edge damage, large heat affected zone and material deformation in traditional laser cutting, significantly improving the cutting quality and batch production efficiency of flexible tactile sensors.

The utility model relates to the technical field of cylindrical batteries, and discloses a cylindrical battery collector plate welding structure which comprises a roll core and a pole piece foil material, the pole piece foil material is wound to form the roll core, die cutting gaps are arranged at two ends of the pole piece foil material, tabs are formed on two sides of the die cutting gaps at two ends of the pole piece foil material, hollow collector plates are arranged on the outer sides of the tabs, and the hollow collector plates are arranged on the outer sides of the hollow collector plates. The hollow collector plate is arranged below the tab, the tab is arranged in the hollow collector plate, a tab passing hole is formed in the hollow collector plate and located on the outer side of the tab, the tab comprises a welding part and a connecting part, the part, located below the hollow collector plate, of the tab is the connecting part, and the part, located above the hollow collector plate, of the tab is the welding part. The risk that the laser penetrates through the foil and the hollowed-out collector plate and penetrates through the roll core diaphragm can be greatly reduced; in the rubbing process of the tabs, fallen metal filings can be intercepted by the hollowed-out collector plates, and the risk that the metal filings fall into the roll core to cause short circuit of the roll core is avoided.

The application relates to the technical field of solar cells, and particularly discloses a solar cell and a preparation method thereof. The solar cell comprises a silicon substrate, the silicon substrate comprises a front surface and a back surface, the front surface comprises a first laser contact area, a second laser contact area and a third laser contact area, the first laser contact area and the third laser contact area are alternately and spacedly arranged on the front surface of the silicon substrate; the second laser contact area and the first laser contact area are overlapped in a vertical direction, the width of the second laser contact area is smaller than that of the first laser contact area, the front surface further comprises a front surface metal electrode, the front surface metal electrode is in contact with the second laser contact area, and the crystallization rate of the second laser contact area is higher than that of a non-overlapping area in the first laser contact area. The solar cell has the advantages that the contact resistance of the metal grid line is reduced through gradient crystallization treatment, filling gain is brought, and the photoelectric conversion efficiency of the solar cell is further improved.

The invention discloses repair powder for repairing damaged high-aluminum high-titanium nickel-based cast superalloy after service. The repair powder comprises the following components in parts by mass: 5.0 to 10.0 parts of Cr, 6.0 to 12.0 parts of Co, 2.5 to 10.0 parts of W, 1.0 to 5.0 parts of Mo, 5.0 to 6.5 parts of Al, 0 to 1.5 parts of Ti, 10.0 to 15.0 parts of Ta, 1.0 to 5.0 parts of Re, 0 to 2.0 parts of Hf and 33 to 69.5 parts of Ni. The method for repairing the damaged part of the high-aluminum high-titanium nickel-based cast superalloy after service by using the repairing powder specifically comprises the following steps: step 1, marking a damaged area; 2, removing a damaged area; 3, laser cladding repairing is carried out; step 4, a destressing process; and fifthly, profile recovery is conducted, specifically, the repaired area is machined in the modes of grinding, polishing and the like, and the three-dimensional profile of the part is recovered. The problem that when existing powder for repairing the high Al + Ti nickel-based cast superalloy is used, the high-temperature mechanical property and the environment use performance of a repaired joint cannot be considered at the same time is solved.

The invention discloses a variable-focus type laser homogenization edge sealing system which comprises a base shell and an adjusting assembly arranged in the base shell, the adjusting assembly is used for conducting distance adjusting operation on laser, the variable-focus type laser homogenization edge sealing system further comprises fixing assemblies arranged on the front side and the rear side of a base, and the fixing assemblies are used for fixing a laser system conveniently. A pumping source and a leading-out module are fixedly connected to the left side and the right side of the base respectively, a third opening is formed in the upper end of the base shell, and a cover body is connected to the upper end of the third opening through a fixing nut. The invention belongs to the technical field of laser edge sealing, and particularly relates to a variable-focus laser homogenization edge sealing system capable of improving the laser utilization rate and saving the QBH optical fiber cost.

The application discloses a preparation method and application of an aggregation-induced emission material with multi-photon absorption properties, and a structural formula of the aggregation-induced emission material is shown as formula I or formula II: wherein R1 and R2 are each independently represented as: the application constructs a series of aggregation-induced emission molecules based on a pyrazine [2,3-g] quinoxaline structural unit, the molecules have strong intramolecular charge transfer characteristics, triphenylamine as an electron donor has a large absorption cross section, so that the material has the multi-photon absorption properties. The molecules have strong absorption and high quantum yield in the wavelength range of 400-700 nm, and show good photodynamic activity. The molecules have the characteristics of simple structure, easy modification, adjustable performance and easy preparation, and have good application prospects in the aspect of multi-photon fluorescence imaging.

The present invention provides a method and device for local nitriding of titanium alloy surface, and relates to the technical field of material surface treatment. The method for local nitriding of titanium alloy surface comprises: vacuuming the surface of the area to be nitrided of the titanium alloy workpiece; placing the surface of the area to be nitrided of the titanium alloy workpiece in a nitrogen atmosphere; and performing nitriding treatment on the area to be nitrided of the titanium alloy workpiece by laser scanning. The device for local nitriding of titanium alloy surface comprises a side wall of a vacuum box having a transparent area, and a side wall opposite to the transparent area having an operating port, the position of the operating port corresponding to the position of the transparent area. When working, the side of the vacuum box having the operating port is buckled on the surface of the area to be nitrided of the titanium alloy workpiece, the laser emission direction is toward the transparent area, and the vacuum box has a nitrogen inlet. The method and device have high nitriding efficiency and stable nitriding effect, and the workpiece is not affected, thereby solving the problems of workpiece deformation and inefficiency caused by long-term high-temperature and high-pressure nitriding.

The invention relates to the technical field of welding devices, in particular to an automatic aligning steel fireproof door welding device which comprises a supporting table and further comprises a butt joint mechanism and a welding mechanism, and the butt joint mechanism is arranged on the supporting table and used for automatically aligning and splicing the long edges and the short edges of a fireproof door frame; the welding mechanism comprises a transverse moving part, a longitudinal moving part, a carrier block, a laser head, a movable block, a motor a, a telescopic component b, a nut block b, a screw rod b and a discharging box. The longitudinal moving part is slidably arranged on the supporting table; the transverse moving part is arranged on the longitudinal moving part; the carrier block is connected with the transverse moving part; the telescopic part b is arranged on the carrier block and is connected with the movable block; the screw rod b is rotationally connected with the movable block; the motor a is arranged on the movable block, and the output end of the motor a is connected with the screw b; the nut block b is in threaded connection with the screw rod b; the laser head is connected with the nut block b; the discharging box is connected with the movable block. According to the invention, the problem of incomplete penetration caused by insufficient laser energy is fundamentally solved, and meanwhile, the required laser power is reduced.

The invention discloses a vagus nerve double-targeting delivery carrier as well as a preparation method and application thereof. According to the vagus nerve double-targeting delivery carrier, the surface of a nano carrier is simultaneously modified with a first targeting ligand capable of being combined with a nicotinic acetylcholine receptor on the surface of vagus nerve cells and a second targeting ligand capable of being specifically combined with a transient receptor potential channel. The enrichment efficiency and the spatial selectivity of the photoresponse nano-carrier in the vagus nerve area are effectively improved through a targeting delivery strategy of lymphatic path guidance and double receptor molecule recognition, the specific targeting of the photoresponse nano-carrier to the vagus nerve is enhanced, and in the follow-up NIR light irradiation process, the photoresponse nano-carrier has a good application prospect. Effective activation of the vagus nerve can be realized under lower optical power density, non-specific stimulation to surrounding non-target tissues is remarkably reduced, and safety and accuracy of light regulation of the vagus nerve are improved.