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日前,中国科学技术部在北京向媒体通报称,当前,LED照明拥有巨大的产业、经济、科技和社会效应,被全球多个国家视为战略性新兴产业。“LED照明是一个全球性的机会,强化全球合作是其产业发展所必需的重要一环”。  在与发达国家和新兴经济体合作方面,通过国际科技合作计划,中国半导体照明国家重点实验室在荷兰代尔夫特大学建立海外研发实体机构“国际开放创新中心”,并共同培养博士及博士后。中国还与德国教研部开展创新应用、标准检测、示范工程评价和产品循环利用等领域合作;与巴西、印度、俄罗斯、南非建立“金砖国家半导体照明合作平台”;联合肯尼亚教研部,共同开展中肯LED照明技术中心建设。  内专家认为,LED照明已成为一场成功的技术革命,在照明产业变革中确立主导地位。随着技术进步的推动和市场需求的拉动,LED照明产业将进入新一轮高速增长期,未来2-3年是半导体照明技术创新与产业发展的最关键时期。
大学材料科学系游波教授团队研制出的一种新型材料——光扩散涂层,在世博会上亮相。该材料能有效解决LED光源的眩光和出光效率低的问题。        LED目前存在着许多不完善的地方,最致命的一个缺点就是其点光源的特性。LED灯发光时会产生强光点,无法用眼睛直视,若一直生活在高亮度的LED光源周围,LED光源所形成的强光点会瞬间影响视觉的判断力。短期内会产生眼睛的不适和疲劳,而长期使用更会产生永久性的伤害。        免了LED产生的光污染危害,游波教授研发的光扩散膜将LED的点光源均匀转换成面光源,从而使光线形成漫反射,从而达到匀光的效果,这样整体的光源更均匀、柔和、饱满。记者了解到,光扩散膜不光可提高LED光线的利用率,增加LED的亮度,更可减少灯管使用量。一旦减少灯管数目,液晶屏幕的耗电量以及热能的产生均会大幅降低,对于绿色环保有所帮助。LED光扩散涂层,可替代目前使用的扩散膜,用于消除LED器件的眩光及点光源问题,可用于户外路灯及交通照明、大尺寸液晶面板以及笔记本电脑的背光源、建筑装饰照明、汽车用照明、家庭照明等。
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Application of laser technology to automobile industry

Date: 2015-04-20
Views: 1696

Safety, comfort, energy saving and environmental protection has been a theme of the world automobile industry development, laser technology as one of the main processing method of modern automobile production, its development has mainly revolved around this subject, combined with professional features. Laser processing applications automotive industry is one of the most populous areas. According to the statistics, in the industrialized countries in Europe and America, have one-50% laser processing parts are used to complete.

In the automotive industry, laser processing is usually dominated by cutting. Cutting carbon dioxide gas laser with high power laser beam, in order to increase the cutting speed and quality, carbon dioxide laser beam cutting machine exported in general are equipped with nozzles, so that while blowing gas during the cutting process. Due to the metal surface for wavelengths 10. Optical reflectivity of 6 ч m high, cutting metal workpieces are often blowing oxygen or compressed air, to increase cutting efficiency and cut of inflammable material, blowing inert gas such as nitrogen to prevent burning.

Technology of laser welding has become standard in the automobile industry. Laser welding of car body panels may be different with different surface coating thickness and metal plates welded together, and then stamped again, this structure can achieve the most reasonable of the Panel made of metal combinations. Laser welding speed is about 4.5m/min, and little deformation, eliminating secondary processing. Laser welding has accelerated the process of stamping parts instead of forging parts. Laser welding, lap width can be reduced and some strengthening parts, can also compress the body volume of the structure itself. This one only body weight can reduce 56kg. Laser welding is used to roof shell frame weld, welding of converter transmission cover, controlled by CNC and its cycle time is about 16 seconds, actually weld time of only 3 seconds and can run continuously 24 hours a day.

The emergence of carbon dioxide laser with high power output, metal surface treatment technology has been a great deal of progress. A wider application of laser alloying, laser laser coating, polishing, laser shock hardening technology. Laser surface treatment of engine valve seat, roof shell and framework has been widely used in the manufacture of parts and components.

In the production of auto parts, such as steel and heat treatment of gears, crankshafts, piston ring, in the laser heat treatment, stop reprocessing, can be installed directly to the Assembly line.

CNC laser machining combined with flexible manufacturing technologies, in automobile mould manufacturing, has been widely used. Laser heat treatment, surface treatment, laser cutting, laser technology, producing mould cycle reduced from 28 weeks 4-6 weeks, meet the needs of automotive quick modification.

Laser rapid prototyping technology is in the early 90, computers, lasers, polymer materials, CAD/CAM, came into being under the rapid development of new technologies such as precision machinery, and soon to be applied in the automobile industry, break the traditional pattern of manufacturing it, become the most attractive technology.

Laser rapid prototyping systems generally use: gases carbon dioxide or argon gas lasers, transformation of complex three dimensional objects using the computer as a two-dimensional layer, and then use the "point" idea, thermoplastic powder sintering or adhesive paper substrate material, constructed from point, line, surface of the part (layer) and layer-by-layer forming. Laser rapid prototyping technology enables new products put on the market as early as possible, greatly improving automobile production capacity and competitiveness of the products on the market.


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