40results about How to "Improve laser power density" patented technology

The invention belongs to the technical field of surface heat treatment, and particularly relates to a powder metallurgy automobile engine chain wheel lock pin hole laser quenching method. According to the method, the purpose of strengthening a component to be quenched is achieved by adopting gas blowing assistance and two-time un-equal speed scanning laser quenching. The two-time scanning speeds are inconsistent; the first scanning speed is low, the second scanning speed is high, and the power in the overall process is kept consistent; the gas flow is kept unchanged; during a quenching process, the gas is blown to a position of a chain wheel plane quenching light spot at a fixed angle at any time. According to the method, the properties, such as the hardness, the wear resistance, the fatigue resistance and the oxidation resistance, of a workpiece are improved, and the problems of low lock pin hole induction quenching hardness, quenching surface melting and the like are solved.

The invention relates to a method for applying laser drilling to sapphire slice drilling. The method comprises a first step of fixing a sapphire slice on an operating platform of a laser device and enabling a laser emission head of the laser device to be aligned to a position to be drilled on the sapphire slice, a second step of setting parameters of the laser device according to the thickness of the sapphire slice, and a third step of starting the laser device to enable the laser device to emit laser beams towards the position to be drilled on the sapphire slice, wherein the second step comprises a first step of setting parameters of the laser device according to the thickness of the sapphire slice and a formula (1), a second step of determining laser emission frequency of the parameters of the laser device according to determined energy in the parameters of the laser device and a formula (2), a third step of determining feed rate of the parameters of the laser device according to determined laser emission frequency of the parameters of the laser device and a formula (3), a fourth step of setting 0.3-0.5 ms as the wave width of the parameters of the laser device, and a fifth step of adjusting Hgt% of the parameters of the laser device to enable average power of the laser device to be 255 W.

The invention relates to a device and a method for massively preparing graphene from a carbon material in a laser shock liquid medium. The device comprises a system for preparing graphene through laser, and a system for transferring the graphene on different substrates. Laser generated by a high-power pulse laser generator is reflected by a light mirror, the obtained laser beam is vertically focused in a proper position of the upper surface of a graphite block target material in an aqueous solution medium, a direct current electric field with the voltage being direct current 24 V is applied totwo ends of the graphite target material, one electrode of the electric field is a copper plate fixed at one end of a reaction tank, the other end of the reaction tank adopts copper foil, a motor drives the copper foil to move at a constant speed, a high-temperature and high-voltage plasma is formed between the graphite and the aqueous medium at the moment of shocking the graphite with the laser,the plasma adheres to the surface of the copper foil under the driving of the electric field, the plasma is continuously adhered, and the copper foil continuously moves in order to finally achieve the purpose of continuous massive preparation of the graphene.

The invention relates to an energy conversion module used for a laser power supply system. An optical fiber interface is installed on the bottom surface of a base. A cavity is formed in the base above the optical fiber interface. A protection sheet is embedded in the base below the cavity and close to the optical fiber interface. A heat dissipation sheet is embedded in the cavity above the protection sheet. The surface, facing the protection sheet, of the heat dissipation sheet is provided with a laser energy conversion chip. Two levels of the laser energy conversion chip are connected with two pole plates extending out of the base from the cavity opening above the heat dissipation sheet. According to the invention, the heat dissipation effect is good, the chip is enabled to receive lasers with higher power density, a high-precision ceramic sleeve is embedded in the optical fiber interface, the coupling precision between the laser energy conversion chip and lasers is improved, the consistency of product output performance is improved, the novel module good in heat dissipation performance, high in output performance, good in reliability, low in cost, simple in assembling process and stable in work is realized, and the energy conversion module can work stably in laser power supply systems of different fields for a long time.

The invention relates to a scanning laser-TIG electric arc composite penetration fusion welding method. The method comprises the steps that a laser beam and TIG electric arc both act on a workpiece, awelding pool is formed, the laser beam is vertically downwards arranged, and the TIG electric arc is arranged on the rear side of the laser beam and is oblique by a certain angle. During composite welding, the front end of the welding pool of the workpiece is filled with a welding wire, by adjusting the scanning track, the scanning frequency and the scanning range of the laser beam, the scanningpath of a focal spot of the laser beam is oval or round in the workpiece thickness direction, a weld joint is formed, and workpiece welding is completed. By means of the method, small hole stability is facilitated, the welding quality is easily improved, then the back bead width and weld joint back width ratio of the penetration fusion weld joint is improved, and the mechanical properties of a joint are further improved.