181 results about "Laser polishing" patented technology

The invention discloses a multi-laser polishing and reinforcing method for surfaces of additive manufacturing metal parts, and the polishing on the surfaces of the additive manufacturing metal parts can be realized by repeatedly scanning and processing the surfaces of the additive manufacturing metal parts through utilizing millisecond pulse laser and nanosecond pulse laser; during the multi-laser scanning polishing process, the additive manufacturing metal parts are subjected to thermal preservation treatment, so that the stress on the surfaces of the additive manufacturing metal parts can be evenly distributed; laser scanning reinforcement is carried out on the surfaces of the laser-polished additive manufacturing metal parts, so that the stress state on the surfaces of the additive manufacturing metal parts can be changed into pressure stress from tensile stress, the anti-fatigue property of the additive manufacturing metal parts can be enhanced, and the usage performance of the metal parts can be met; compared with a manual polishing method, the multi-laser polishing and reinforcement efficiency of the additive manufacturing metal parts is high and is as 20 times as that of the manual polishing, the non-contact rapid polishing of the additive manufacturing metal parts can be realized, the tensile stress, caused by the laser polishing, of the additive manufacturing metal parts can be eliminated, and the anti-fatigue property of the additive manufacturing metal parts can be enhanced.

The invention discloses a laser beam transformation shaper outputting uniform linear spots, which is an optical system capable of transforming and shaping laser beams with irregular spot shapes and nonuniformly distributed energy into laser beams with uniformly distributed energy and the spot shape approaching a line, and is mainly applied to laser polishing, laser cleaning and laser induced material surface modification, and belongs to field of laser surface processing technology and application thereof. The laser beam transformation shaper comprises seven parts, namely a first part of a telescope system consisting of a plurality of circular lenses or cylindrical lenses, second, third, fourth and fifth parts consisting of a cylindrical lens array respectively provided with N cylindrical lenses, a sixth part consisting of two cylindrical lenses of which the generatrices are vertical mutually, and a seventh part consisting of cylindrical lenses or cylindrical lens combination. The laser beam transformation shaper transforms and shapes incident laser into linear laser spots with uniformly distributed spot energy, and greatly improves the efficiency of laser polishing, laser cleaningand laser induced material surface modification by matching high-speed movement of a work bench.

The invention discloses a laser cleaning and polishing composite processing method for the surface of carbon steel. By means of the method, laser cleaning and laser polishing processes are seamlesslycombined and used on the same equipment. The method can be widely applied to surface laser processing of steel parts. A nanosecond pulse laser with a certain output energy range is used, so that a corrosion layer can be evaporated; the corrosion layer on the surface of the carbon steel is quickly removed by utilizing primary laser treatment; and then laser parameters are adjusted to radiate a cleaned surface to enable a protruding fused object on the carbon steel to flow and fill and solidify a sunken part, and the polished surface with small roughness and improved performance is obtained. Therefore, defects in the prior art are overcome, fusion pits and micro-scale defects of the surface of the carbon steel after laser cleaning can be effectively repaired, the surface roughness is reduced, and the purposes of improving the laser processing efficiency of the carbon steel and keeping the surface performance are achieved.

The invention discloses a 3D surface laser polishing method and device. The device comprises a device lathe bed, an inert gas bottle, an oxygen concentration tester, a 3D galvanometer and an internalQBH collimator with a beam expander. An inner quasi flat top continuous laser device is arranged in the device lathe bed, an inert gas seal cabin is arranged above the device lathe bed, an electromagnetic chuck is arranged in the inert gas seal cabin, and the inert gas seal cabin is connected with an inert gas seal cabin air inlet pipe through an inert gas seal cabin air inlet valve. The device has the beneficial effects that firstly, 3D surfaces of a plastic injection molding mold cavity and a blowing plastic mold cavity are subjected to laser polishing; secondly, 3D surfaces of a general anddedicated structural part or metal parts of the device can be subjected to laser polishing; and thirdly, the metal 3D surface for decoration can be mechanically polished.

The invention provides an additive manufacturing and surface polishing synchronous processing method and device. The method is characterized in that after powder in a selected space at some slice layer is molten into a cladding layer by laser during layer-based forming processing of an additive manufacturing part, the inner outline surface and/ or the outer outline surface of the cladding layer are quickly scanned and polished through laser so as to remove redundant materials in the selected areas on the inner outline surface and/ or the outer outline surface, and then the cladding layer of the next slice layer can be formed and processed by laser until redundant materials in all selected areas on the inner outline surface and/ or the outer outline surface of the whole additive manufacturing part are removed. With the adoption of the method, metal surface materials can be directly removed, and residual stress generated by additive manufacturing can be released; the technical route thatthe additive manufacturing technology and the surface polishing technology are synchronously carried out is capable of polishing the inner surface and the outer surface of any metal additive manufacturing part with a complex empty cavity; and the technical problem that the inner surface of an empty cavity of the part cannot be polished in later laser polishing or mechanical processing can be overcome.

The invention relates to a method for laser-assisted polishing of a CVD diamond. The method comprises the following steps: first, selecting a suitable laser type according to the material property ofthe CVD diamond, and simulating the laser ablation of the CVD diamond so as to acquire suitable laser ablation parameters; then, carrying out laser rough polishing based on optimum laser process parameters; and finally, carrying out mechanical precision polishing by the adoption of a polishing disc till the required precision is achieved, so that a graphitization layer generated during the laser ablation process and surface defects such as microcracks can be removed. Through the method provided by the invention, the problems that the graphitization layer is easy to generate during the laser polishing process of the CVD diamond and the polishing efficiency of the mechanical polishing process is low can be solved.

An ultrafast laser polishing method for ceramic matrix composite material At first, that proces sample of SiC ceramic matrix composite is fixed on the lase processing equipment, the laser processing equipment comprise an optical path system and a processing platform, the optical path system comprises a femtosecond laser, and the laser of the femtosecond laser acts on the processing platform afterpassing through a mirror, a beam expanding mirror, an aperture, a vibrating mirror and a field mirror assembly; The machining platform comprises a three-dimensional movement mechanism and a fixture inthe x, y and z axes directions relative to the worktable, an angular displacement table is installed in the three-dimensional movement mechanism, and the included angle between the y axis direction and the normal of the worktable can be changed by adjusting the angular displacement table to obtain a large incident angle of the laser beam; The laser parameters of the femtosecond laser, the scanning of the vibrating mirror and the movement of the three-dimensional moving mechanism are controlled by the computer to polish the sample. The invention utilizes the laser and the processing platform to work cooperatively, adjusts the transverse and longitudinal light spot overlap ratio according to the need, ensures the uniformity of the processing, and has high processing efficiency.

The invention belongs to the technical field of laser equipment, and particularly relates to ultrafast laser cleaning and fine polishing equipment for the inner wall of a component and a control method. The ultrafast laser cleaning and fine polishing equipment for the inner wall of the component comprises a main machine body, a laser system and a rotary clamping mechanism, the laser system comprises an ultrafast fiber laser, a laser head and a laser reflection mechanism, the ultrafast fiber laser is arranged in the main machine body, the laser head is electrically connected with the ultrafastfiber laser, the laser reflection mechanism comprises a fixing rod, a mirror bracket and a reflector, the fixing rod is arranged on the laser head, the mirror bracket is arranged at the lower end of the fixing rod, and the reflector is used for extending into an area defined by the inner ring wall of the to-be-machined component. When the ultrafast laser beam needs to be adjusted to act on the inner ring wall of the component to be machined, flexible adjustment of the position of the ultrafast laser beam acting on the inner ring wall of the component to be machined can be achieved only by vertically adjusting the relative positions of the fixing rod and the laser head and adjusting the position of the mirror bracket relative to the fixing rod, and efficient laser cleaning and laser polishing are achieved.

The invention discloses a composite polishing method based on a laser and a plasma. The workpiece to be machined is fixed on the working table of the polishing system, then the laser beam is convergedto the surface of the workpiece to be processed through the laser polishing device to form a laser beam focal spot, and then a normal-pressure plasma beam is generated through the plasma polishing device to impact the surface of the workpiece to be processed to form a plasma impact region; adjusting the laser beam pointing direction and the plasma impact direction to enable the laser beam focal spot to be overlapped with the plasma impact region, and carrying out composite polishing on the surface of the workpiece to be processed; moving the focal spot of the laser beam through a multi-axis moving platform, and the plasma impact composite area finishes the polishing of the whole surface of the workpiece to be machined. According to the method, the modification and composite etching effects of the surface of the material on the surface of the material are achieved by utilizing the plasma in the ultrafast laser processing process, the surface machining quality is improved, and the bottleneck problem that the surface machining quality of the ultrafast laser is not high is solved, so that the high-quality and high-efficiency fine polishing of the surface of the material is realized.

The invention provides a method for laser polishing of glass and a polishing processing method of a glass hole and a glass sheet. The method comprises the following steps of: irradiating a cutting contour line arranged on a glass plate by adopting first laser, and then cutting off the glass along the cutting contour line; and irradiating along a polishing contour line which is 0.3-1.2mm close to the cutting contour line by adopting second laser, and evaporating the glass on the two sides of the polishing contour line to obtain a polished glass product, wherein the second laser is CO2 continuous laser. According to the method, the defects of micro-cracks of a section caused by a conventional cutting mode can be overcome; the polishing contour line is directly irradiated by the CO2 continuous laser, so that glass bodies on the two sides of the polishing contour line are evaporated and removed, a smooth glass side section is obtained, and the mechanical property of the glass is improved;and the method can be applied to edge treatment of glass drilling, inner contour and outer contour, the plane quality of the side surface is optimized, and the potential fragment risk of the subsequent process is solved.

The invention provides a laser polishing method. The method comprises the following steps of S1, 3D metal objects are manufactured by additive manufacturing techniques; step S2, a mechanical arm control system is used to lift a 3D metal object, and adjusting the orientation of the laser processing region of the 3D metal object; and S3, an inert gas environment is formed around the laser processingregion of the 3D metal object, and laser radiation is carried out on the laser processing region of the 3D metal object. The novel laser polishing technology provides a highly flexible polishing solution for 3D printed metal products, the technology is advanced and strong in practicability, and the technical effect that the traditional metal polishing technology cannot be achieved is achieved.

The invention relates to a method for laser polishing of the surface of a silicon wafer, and belongs to the technical field of surface polishing of semiconductor materials. The method comprises the steps that firstly, the silicon wafer is ultrasonically cleaned and blow-dried by cold air; then the surface of the silicon wafer is subjected to scanning processing through a set laser scanning processpath and laser processing parameters by utilizing a laser surface polishing technology; and after processing is completed, ultrasonic cleaning and cold air blow-drying are conducted, and thus the high-precision laser-polished surface is obtained. The preparation method is simple in process, high in efficiency, flexible and controllable, and has great repeatability, and industrialization application is easy to realize.

The invention relates to a meter-stage large-opening-diameter optical element CO2 laser polishing device. On the basis that an optical element does constant-speed motion on a worktable, laser penetrates through a hole in a support, through a reflecting mirror, a light beam is transmitted to a vibrating mirror system composed of a vibrating mirror and a focusing mirror, machining of the optical element is systematically achieved, the reflecting mirror, the vibrating mirror and the focusing mirror which are integrated are mounted on the support and do linear motion in the direction where the laser is incident from the hole, light path transmission cannot be affected by motion of the vibrating mirror system, motion track rough positioning formed by worktable motion and vibrating mirror systemmotion can be achieved well, the self motion of the vibrating mirror system achieves precise positioning of the motion track, according to the device, through the manner of spiral track machining andchanging of parameters, the optical element is scanned, through a fusion and gasifying combined manner, the surface of the optical element is polished, and the device can achieve linear or circumference motion of the meter stage or above.

The invention discloses a method for ultrasonic-assisted laser polishing of a ceramic-based composite material. The method comprises the following steps of firstly, grinding and polishing the surfaceof a machined sample wafer of a SiC ceramic-based composite material, and carrying out ultrasonic cleaning; fixing the machined sample wafer on an ultrasonic-assisted laser polishing processing device, and moving a platform to focus the laser to an initial machining position; setting a laser parameter, a galvanometer scanning parameter, an ultrasonic vibration parameter and a motion parameter of an XYZ high-precision mobile platform, starting a femtosecond laser and an ultrasonic generator, and carrying out ultrasonic-assisted laser polishing machining on the machined sample wafer by using theadjusted parameters; and after polishing is completed, carrying out ultrasonic cleaning on the machined sample wafer again. According to the method, the laser machining method and the ultrasonic machining method are combined, the effects of acoustic streaming, cavitation and the like of ultrasonic waves are fully utilized, the problems of defects such as a recast layer and surface cracks caused by the plasma effect and the particle adhesion effect in the laser polishing process are solved, the laser machining process is optimized, and the material removal rate and the polished surface qualityare improved.

The invention relates to a magnetic field auxiliary laser polishing method based on existing laser processing equipment. Compared with existing polishing technology, introduction of an auxiliary magnetic field obviously improves the surface quality of a polishing piece. The magnetic field auxiliary laser polishing method based on the existing laser processing equipment comprises the following steps that 1, a pollution layer or an oxidation layer of the material surface is removed by adopting laser cleaning technology; 2, a magnetic field parameter is arranged, the polishing piece is placed ina stable magnetic field after the communicating and stable magnetic field is formed; and 3, a laser processing optimized parameter is arranged, polishing treatment is carried out on the material surface under the magnetic field auxiliary action. The auxiliary magnetic field can adjust and control molten pool flowing and plasma moving in the processing process, negative effect generated by mutual action of a laser and materials is effectively reduced, so that the surface of the polishing piece obtains fine and uniform microstructures, the strength, hardness, corrosion resistance and the like ofthe material surface are improved, the processing technology and processing areas of the laser are adjusted flexibly, the processing precision is high, the efficiency is high, and the cost is low.

Laser polishing is achieved by directing laser beam perpendicular at the fiber end face in a connectorized optical fiber having a metal ferrule. The spot size of the laser beam is larger than the bare optical fiber diameter, providing a more uniform spatial distribution of the radiation energy over the fiber end face. The metal ferrule provides heat conduction to prevent excessive heat built up at the fiber tip, which would lead to undesirable surface defects and geometries. The connectorized optical fiber may be pre-shaped prior to laser polishing. Subsequent laser polishing flattens the fiber end face.

The invention discloses a surface treatment method for a porous hydrophilic stainless steel heat exchange tube. The method includes the following steps that liquid phase plasma electrolysis or laser polishing or sand blasting treatment is carried out on a stainless steel tube to achieve surface roughening; chemical electrolysis or sol modified electroplating treatment is conducted on the roughened steel tube surface; a stainless steel heat exchange tube and a heat exchanger with the stainless steel heat exchange tube are obtained through the steps. According to the method, porous and recess microstructures can be obtained from surfaces of various stainless steel tubes, and reinforcement evaporation and boiling heat transfer are greatly improved; continuous strong hydrophilic performance can be obtained from the surfaces of various stainless steel tubes, water film spreading is accelerated, the thickness of a water film can be reduced, and therefore heat exchange efficiency is improved; metal surfaces more resistant to pitting corrosion, chloridion stress corrosion and concentration difference micro cell corrosion can be obtained from the surfaces of various stainless steel tubes, overall stability of a heat exchanger unit is improved, and the service life of the heat exchanger unit is prolonged.

The invention discloses a laser polishing method of mobile phone display screen glass. According to the method, laser is adopted for polishing the mobile phone display screen glass, a beam shaping step is used for optimizing a laser source, a pre-heating step is used for solving the problem that the mobile phone display screen glass is fragile under thermal action, and non-contact nondestructive high-quality efficient polishing is conducted on the mobile phone display screen glass. The efficient economic novel method is provided for processing for obtaining the nondestructive smooth mobile phone display screen glass.

The invention provides an evaporation-melting composite laser polishing method capable of realizing peak clipping and then valley filling of a metal surface. According to the method, nanosecond pulselaser is introduced to perform peak clipping treatment on a large-roughness surface, and then composite laser polishing is performed on the large-roughness surface in such a manner that the valley bottom is filled through continuous laser fusion, so that generation of microcracks is prevented; the pulse width of nanosecond laser is extremely short, so that the severe thermal influence cannot be caused by repeated scanning, the surface is bright after action, and the peak of the microscopic surface is cut down; then continuous laser fusion is adopted, the material is fused and flows to fill thevalley bottom, and finally, the flat and bright polished surface without microscopic thermal cracks is obtained. The method is high in polishing efficiency and environmentally friendly.

The invention discloses a laser polishing device and a laser polishing method. The laser polishing device comprises a main machine box, a rotary clamping mechanism, a laser system, a first control system and a second control system; the rotary clamping mechanism is arranged in the main machine box and used for clamping a metal piece to be polished; the laser system is arranged in the main machine box, the laser system comprises a laser transmitter and a laser galvanometer assembly, and the laser transmitter is connected with the laser galvanometer assembly; the first control system is electrically connected with the laser transmitter and is used for controlling the laser transmitter to carry out laser polishing on the metal piece according to preset laser parameters and a preset polishing range; and the second control system is electrically connected with the laser galvanometer assembly and the rotary clamping mechanism and used for driving the laser galvanometer assembly to move and driving the rotary clamping mechanism to rotate, and multi-axis linkage is achieved.