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激光切割一直是激光加工应用广泛的一项技术,脉冲激光适用于金属材料,连续激光适用于非金属材料,后者是激光切割技术的重要应用领域。与计算机控制的自动设备结合,激光束具有无限的仿形切割能力,切割轨迹修改方便。激光切割无机械变形、无刀具磨损,容易实现自动化生产ã€?br /> <br /> 激光切割广泛应用于钣金加工、金属加工、广告制作、厨具、汽车、灯具、锯片、升降电梯、金属工艺品、纺织机械、粮食机械、眼镜制作、航空航天、医疗器械、仪器仪表等行业。特别是在钣金加工行业中已取代传统加工方式,深受行业用户的青睐ã€?br /> <br /> 一、激光切割工è‰?br /> <br /> 激光切割利用高功率密度激光束照射被切割材料,使材料很快被加热至汽化温度,蒸发形成孔洞,随着光束对材料的移动,孔洞连续形成宽度很窄的(å¦?.1mm左右)切缝,完成对材料的切割ã€?br /> <br /> 激光切割可分为激光汽化切割、激光熔化切割、激光氧气切割和激光划片与控制断裂四类ã€?br /> <br /> 1、激光汽化切å‰?br /> <br /> 利用高能量密度的激光束加热工件,使温度迅速上升,在非常短的时间内达到材料的沸点,材料开始汽化,形成蒸气。这些蒸气的喷出速度很大,在蒸气喷出的同时,在材料上形成切口。材料的汽化热一般很大,所以激光汽化切割时需要很大的功率和功率密度ã€?br /> <br /> 激光汽化切割多用于极薄金属材料和非金属材料(如纸、布、木材、塑料、橡皮、泡沫等)的切割。超短脉冲激光使这项技术可以应用于其他材料。金属中的自由电子吸收激光并剧烈升温。激光脉冲不与熔融的粒子和等离子体反应,材料直接升华,没有时间将能量以热量的形式传给周围材料。皮秒脉冲烧蚀材料时没有明显的热效应,没有熔化和毛刺形成ã€?br /> <br /> 2、激光熔化切å‰?br /> <br /> 激光熔化切割时,用激光加热使金属材料熔化,然后通过与光束同轴的喷嘴喷吹非氧化性气ä½?Ar、He、Nç­?,依靠气体的强大压力使液态金属排出,形成切口。激光熔化切割不需要使金属完全汽化,所需能量只有汽化切割çš?/10ã€?br /> <br /> 激光熔化切割主要用于一些不易氧化的材料或活性金属的切割,如不锈钢、钛、铝及其合金等,也可以用于切割其他可熔材料,例如陶瓷ã€?br /> <br /> 3、激光氧气切å‰?火焰切割)<br /> <br /> 激光氧气切割原理类似于氧乙炔切割。它是用激光作为预热热源,用氧气等活性气体作为切割气体。喷吹出的气体一方面与切割金属作用,发生氧化反应,放出大量的氧化çƒ?另一方面把熔融的氧化物和熔化物从反应区吹出,在金属中形成切口。由于切割过程中的氧化反应产生了大量的热,所以激光氧气切割所需要的能量只是熔化切割çš?/2,而切割速度远远大于激光汽化切割和熔化切割。激光氧气切割主要用于碳钢、钛钢以及热处理钢等易氧化的金属材料ã€?br /> <br /> 4、激光划片与控制断裂<br /> <br /> 激光划片是利用高能量密度的激光在脆性材料的表面进行扫描,使材料受热蒸发出一条小槽,然后施加一定的压力,脆性材料就会沿小槽处裂开。激光划片用的激光器一般为Q开关激光器和CO2激光器ã€?br /> <br /> <p> 控制断裂是利用激光刻槽时所产生的陡峭的温度分布,在脆性材料中产生局部热应力,使材料沿小槽断开ã€?</p> <p> <br /> </p></div> <div class="newArtiNext"><div>上一æ?<a href="132.html">液压折弯机上下不同步的原因及解决办法</a></div> <div>下一æ?<a href="130.html">数控走芯机机床编程技巧都有哪äº?/a></div> </div> <div class="tag">相关标签ï¼?/div> </div> <div class="insPro">相关新闻</div> <div class="insNews"> <ul> <li><a href="/news/213.html">线切割机床使用时还有哪些注意事项</a><span>2021-08-10</span></li> <li><a href="/news/212.html">线切割机床使用时注意事项</a><span>2021-07-27</span></li> <li><a href="/news/211.html">激光切割原理(二)</a><span>2021-07-06</span></li> <li><a href="/news/210.html">激光切割原理(一ï¼?/a><span>2021-06-29</span></li> 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