Improving surface finish in pulsed laser micro polishing. Another area of laser polishing is remelting metal surface to change its contrast thus creating a distinct smooth mark on the metal. Sigma laser micro cutting and laser micromachining systems are designed to accommodate a wide variety of applications, including stent and hypo tube cutting, laser drilling, laser ablation and even specialized laser marking of medical, electronic and automotive components. Lasing materials of solidstate lasers are synthetic crystal rods. Partly replacement of manual polishing with results of around ra 0,1m. Micropulse laser therapy for retina and glaucoma clearwaters macula center is among the first retina practices in florida to employ the new micropulse laser therapy for treating retina disease micropulse is a new laser technology that can safely and effectively treat patients with retinal disorders such as diabetic. Smoother surfaces with pulsed laser polishing inventors frank pfefferkorn, xiaochun li, neil duffie, chao ma, venkata madhukanth vadali since its founding in 1925 as the patenting and licensing organization for the university of wisconsinmadison, warf has been working with business and industry to transform university research into products. Micropulse p3 cyclophotocoagulation, however, uses a slow application of laser energy that is chopped into micropulses or, bursts. The effect of laser pulse duration and feed rate on. P was shown to be an effective process at these scales, the knowledge of the process physics lacked thoroughness. This video is a short tutorial about how to apply our laser polishing product. If the laser for the spot control is the continuous visible light, then it is possible to detect the laser spot by using the ccdfpga control system in real time. Process optimisation in pulsed laser micromachining with applications in medical device manufacturing k.
The superior capability of this laser is associated with the precise control of lasermaterial interaction as an outcome of extremely short interaction times resulting in almostnegligible heat affected. This is a good technic for use in coating deposition and removal. P was carried out on micro end milled ti6al4v samples at three different pulse durations, viz. Microjewel ultracompact dpss lasers quantum composers. Yag, dpss lasers with an ultracompact design delivering 8mj at 1064nm. Conclusions in the work presented, the effects of laser pulse duration on pulsed laser micro polishing pl. Laser polishing machine could put hand buffers out of work by ben coxworth. Effects of pulse duration on laser micro polishing. Effects of laser pulse duration on pulse laser micro polishing. Process developed by famous german fraunhofer institute ilt in aachen. Currently, few studies focus on laser polishing of additive laser manufacturing surfaces, and it tends to limit the industrial use of additive manufacturing technology. Laser polishing of additive manufactured 316l stainless.
Micropulse p3 cyclophotocoagulation a burst of good news. The microjewel lasers are a series of rugged, qswitched, nd. Laser ablation is the removal of surface coating from base material. May 15, 2017 conclusions in the work presented, the effects of laser pulse duration on pulsed laser micro polishing pl. Grinding trovalizing with a capacity of 5 ltr or 10 ltrcontainer thickness of 0. Clearwaters macula center is among the first retina practices in florida to employ the new micropulse laser therapy for treating retina disease. Polishing glass and plastic materials with co 2 laser radiation is based on the absorption of the radiation in a thin border layer of the work piece such that temperatures just below the evaporation temperature are attained on the surface. Owing to their precision and versatility, lasers have become an indispensable tool in a wide variety of manufacturing fields. We offer a variety of finishes to meet all the spespi standards. Preheating laser power, scanning velocity, beam offset of the two laser beams, and intensity distribution of the preheating laser beam. Theory material absorption plays an important role in laser machining. Laser micromachining is a process used to make tiny features in parts measured in micrometers or millimeters. Traditional methods of cyclophotocoagulation burn the ciliary body. The goal of this work, therefore was to improve upon the existing knowledge of pl.
Motivation laser micro polishing with pulsed laser radiation is a surface finishing process to reduce the micro roughness. Improved surface finish and smoothness can be achieved on select areas of different metallic surfaces, produced by meso micro. During laser micropolishing, the controllable laser energy density is a key technology to improve the surface roughness. Laser precision cutting is an attractive micromachining technique for most materials. The influence of the following process parameters on the surface roughness is examined. This is a common method to mark logos on mobile phones casing.
Polishing of microlens arrays light scattering surfaces by 1. The innovation of laser polishing lies in its fundamentally different mode of action remelting compared to conventional. Prospects of laser polishing for small and complexly shaped parts. The introduction of real time controlled power supply technique made it possible to considerably improve welding feasibility, welding seam quality, and. This paper will describe the influence of laser pulse duration on surface roughness reduction during pl. Reliable, lightweight, and efficient, the microjewel lasers are ideal for commercial and oem applications requiring small form factors. Thermocapillary flows can be generated in pulsed laser micro polishing by using longer melt durations, significantly reducing surface roughness at the expense of creating residual high spatial. We offer drive electronics for the easy operation of all types of laser diodes. Roland geyl, francois houbre, genevieve chabassier, and andre roussel polishing and testing laser amplifier disks and spatial filtering lenses for the lillmj, proc. P has been shown to be an effective method of polishing micro metallic parts whose surface roughness can approach the feature size. P as oscillations of capillary waves with damping resulting from the forces of surface tension and viscosity. Patterns or shapes can be engraved onto any material. For micro laser polishing pulsed laser radiation is used, which is a combination of remelting a thin surface layer smaller. Laser ablation hylax laser industrial laser equipment.
A fundamental study of pulsed laser micro polishing plp was conducted as a method for reducing surface roughness of micromesoscale metallic parts. Process optimisation in pulsed laser micromachining with. In this paper laser micro polishing with an additional laser beam for preheating of the surface is examined. Each pulse heats up, but does not burn or destroy eye tissue. The objective of this work is to evaluate the changes in microstructure and mechanical properties of s7 tool steel after surface finishing using pulsed laser micro polishing plp. Investigation of laser micropolishing of stainless steel. Jan 14, 2015 production machine for 3d laser processing using the extensive experience acquired in the high precision automation and the integration of a multitude of laser applications, unitechnologies now. Irregular, adaptive scan trajectories for pulsed laser. Jul 15, 2016 this video is a short tutorial about how to apply our laser polishing product. Laser micropolishing of stainless steel for antibacterial. It can be used in composition of different material but a. Abstract in this publication laser micro polishing with an additional laser beam for preheating of the surface is investigated. Home eye news micropulse laser therapy for retina and glaucoma. Manual oaded machine, with fiber laser 500w, 3dscanning system.
Application of picosecond lasers for surface modification. When laser radiation is used to polish metals, a thin surface layer of the workpiece is remelted and the surface smoothed due to interfacial tension. Pulsed laser micro polishing of metals using dualbeam technology. In this publication laser micro polishing with an additional laser beam for preheating of the surface is investigated. Laser shiny marking by polishing of sandblasted metal surface. This project is focused on developing physics based models to predict the outcome of pulsed laser micro polishing pl. Investigation of laser micropolishing of stainless steel 316l. Irregular, adaptive scan trajectories for pulsed laser micro.
Pulsed lasers effectively complete this work by depositing very small, finite amounts of energy into a material, resulting in extremely precise and reproducible material removal. Although plp was shown to be an effective process at these scales, the knowledge of the process physics lacked thoroughness. The result has an attractive hi tech look and feel. To achieve the advantage of both high polishing efficiency and smoother surface finish, pulsed laser micro polishing pl. P with pulse durations of 300650 ns and a spot size of 60. For metals for the processvariant polishing by remelting, two subvariants exist.
Production machine for 3d laser processing using the extensive experience acquired in the high precision automation and the integration of a multitude of laser applications, unitechnologies now. An increasing number of recent technological advancement is linked to the widespread adoptions of ultrashort picosecond ps pulsed laser in various applications of material processing. For industrial applications, the most commonly used laser crystals are made of. Polishing or manual grinding if the parts are delicate and below a material thickness of 0. Small micro roughness as the surface results from the liquid phase. Laser polishing and laser shape correction of optical.
Experiment study of rapid laser polishing of freeform steel. Ultrashortpulse, highrepetitionrate lasers are particularly well suited for micromachining because of their ability to vaporize matter without generating heat, making them ideal for machining. Efficient laser polishing of silica microoptic components osa. Laser micropolishing for metallic surface using uv nano. Austenitic stainless steel is widely used for different. Improved surface finish and smoothness can be achieved on select areas of different metallic surfaces, produced by mesomicro. The proposed study describes an experimental investigation of laser polishing surfaces obtained by additive laser manufacturing process. Laser finishings experienced and skilled specialists offer high precision finishing and polishing services. Effects of pulsed laser micro polishing on microstructure and mechanical properties of s7 tool steel. Remote excimer laser micromachining services model sreemanth m uppuluri school of mechanical engineering purdue university west lafayette, in 479071288 ph. With the proliferation of laserthis and laserthat widgets that seem to pervade our lives, who in their right mind would consider laser polishing. The rods are pumped with energy, typically from xenon flash lamps or laser diode stacks. Laser system with shield gas athmosphere for polishing.
Most solidstate lasers use resonator cavities with external mirrors. In this work laser micro polishing lmp of cold rolled 0. The upper measurement shows the gaussian intensity profile out of the singlemode 1kw laser used for smallest spot sizes and multimode top hat profile out of a 1kw multimode laser used for example in laser polishing machines. Whereas the former was determined in situfrom the ir radiation emitted by the glass surface, the latter was obtained by comparison of the ir radiation emitted by the bulk sample with a theoretical model. To reduce the residual waviness and shape errors after laser polishing, the authors investigated a further laser based process step laser beam figuring, lbf which ablates material for a shape correction. Prospects of laser polishing for small and complexly. Laser polishing machine could put hand buffers out of work. Prospects of laser polishing for small and complexly shaped parts fraunhofer institute for laser technology ilt steinbachstra. During laser polishing, the glass material is relocated at the surface, thus no shape errors can be corrected. In contrast to macro laser polishing, micro laser polishing is a discrete rather than a continuous remelting process the remelting depth is in. Experimental analysis of applicability of a picosecond laser. In this paper, we have investigated a method which controls the energy density of ultraviolet uv pulse laser in real time with the control of continuous wave cw laser spot size in laser micropolishing for metallic surface. Yao department of mechanical engineering, columbia university, new york, usa pulsed laser machining offers many unique capabilities that continuouswave.
The process allows removal of extremely thin layers and is especially interesting for machining of very hard materials and delicate parts. The eye pressure iop is often elevated in eyes that have glaucoma. Micropulse is a new laser technology that can safely and effectively treat patients with retinal disorders such as diabetic macular edema, diabetic retinopathy and central serous retinopathy. We handle projects of all sizes with quick turnaround times and competitive pricing. Laser polishing and laser shape correction of optical glass. Introduction pulsed laser micro polishing plp is a nonconta ct surface finishing process suitable for polishing micro metallic surfaces produced by micromanufacturing processes e. Laser polishing hylax laser industrial laser equipment. Laser micro texturing using ultrashort pulse lasers is a new technology for applying surface textures with very fine features and an extremely high depth resolution.
As a result, the viscosity of the material is reduced so that the roughness flows and the surface is smoothened due to surface tension. Laser polishing of glass and plastics brochure fraunhofer ilt. Laser micro cutting systems laser micromachining systems. Pulsed laser micro polishing engineers world online. Introduction pulsed laser micro polishing plp is a non contact su rface smoothening process suitable for metallic parts of m icro meso scales, where conventional polishing methods are unproductive andor uneconomic. The innovation of laser polishing lies in its fundamentally different mode of action remelting compared to conventional grinding and polishing processes ablation. The pulse duration is normally in the range of 20 nanoseconds and the molten material is already resolidified when the next laser pulse hits the surface and creates a new. Laser, the new standard for polishing technique the new laser polishing products have been developed for the. In this paper, we have investigated a method which controls the energy density of ultraviolet uv pulse laser in real time with the control of continuous wave cw laser spot size in laser micro polishing for metallic surface. This project is focused on developing physicsbased models to predict the outcome of pulsed laser micro polishing pl p. Polishing and testing laser amplifier disks and spatial.
We report a study of the basic characteristics of laser polishing of fused silica with a. In the most common form of glaucoma, primary open angle glaucoma poag, the drainage system appears to be blocked at the microscopic level. Micropulse laser therapy for retina in tampa bay, florida. Experimental analysis of applicability of a picosecond. To reduce the residual waviness and shape errors after laser polishing, the authors investigated a further laserbased process step laser beam figuring, lbf which ablates material for a shape correction. Effects of laser pulse duration on pulse laser micro polishing core. Pulsed laser micro polishing plp has been shown to be an effective method of polishing micro metallic parts whose surface roughness can approach the. Be the first on your block to own a laser polisher. Pulsed laser micro polishing of metals using dualbeam. During laser micro polishing, the controllable laser energy density is a key technology to improve the surface roughness. It allows the creation of smallscale textures that change the functional properties of surfaces, like reduction of friction or change of optical properties. P process is an important parameter that significantly affects the achievable surface finish. A fundamental study of pulsed laser micro polishing pl. P was conducted as a method for reducing surface roughness of micromesoscale metallic parts.
Collimators made of glass or plastic are used to produce the most precise beam profile possible from the emitting laser diode. Oct 28, 2015 in contrast to macro laser polishing, micro laser polishing is a discrete rather than a continuous remelting process the remelting depth is in the range of 0. Laser polishing of additive laser manufacturing surfaces. Application of picosecond lasers for surface modification and. We assist our customers in selecting the best finish for their tools. Laser microengraving and micromarking is really a subset of laser micromilling. In contrast to macro laser polishing, micro laser polishing is a discrete rather than a continuous remelting process the remelting depth is in the range of 0. Small amounts of material are removed by each laser pulse.
1347 366 755 737 1079 1117 174 866 516 672 1495 1416 1105 891 1016 1336 1031 1013 624 557 247 1002 785 429 1237 801 748 1132 566 363 1178 1351 115