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激光切割机理在说明粘渣现象之前,先了解一下激光切割机理非常必要。平常所说的激光切割,多指用氧作辅助气体的钢切割。用聚焦激光热源照射待切割部位,当表面温度高到一定值时,钢就在氧的作用下发生剧烈燃烧,形成熔融氧化铁。在辅助气流的吹动冲刷下,熔融物被迅速吹掉,形成切缝,得到非常光滑的断面。这种切割过程,实际是钢和氧发生化学反应的过程,伴随产生大量的反应热。甚至有人认为,这种切割一旦开始,就不必再从外界补充能量,仅靠反应热就能维持切割的进行。但实际并不这么简单,急速吹掉的熔融物,将反应热的大部分带走,又因热传导和气流的冷却作用,切割部分的热量耗损很大,必须由激光不断供给足够的热量才行。
Laser cutting mechanism In the description of sticky slag phenomenon, it is necessary to understand the laser cutting mechanism. Commonly referred to as laser cutting, multi-fingered with oxygen as the auxiliary gas steel cutting. Focusing the laser heat source to irradiate the site to be cut, when the surface temperature reaches a certain value, the steel undergoes intense combustion under the action of oxygen to form molten iron oxide. Under the blow of the auxiliary air flow, the melt is rapidly blown off to form a kerf, resulting in a very smooth cross-section. This cutting process, in fact, is a chemical reaction of steel with oxygen, accompanied by a large amount of heat of reaction. Some people even think that once the cutting started, it is no longer necessary to replenish energy from the outside world, the heat of reaction alone will be able to maintain the cutting. But the actual is not so simple, the rapid blow-off of the melt, most of the reaction heat away, but also due to heat conduction and cooling of the airflow, the cutting part of the heat loss is large, the laser must continue to supply enough heat Caixing .