我厂研制成功的数控等离子切割机,主要用于切割10～30mm厚的板材。过去板材下料常采用手工气割,不仅割缝宽,加热时间长,板材变形大,而且只能用于对中、低碳钢钢板的下料,生产效率低,劳动强度大。我厂的数控等离子切割机的特点是可把起弧、灭弧及任一工步的速度变化等都编入程序之中,并具有意外断弧时的暂停与再起弧功能,切割精度可达±0.3mm,割口表面粗糙度可达Ra25～12.5μm,板材割缝宽度为1.5～2mm。与手工气割比较,可节约板 I successfully developed NC plasma cutting machine, mainly for cutting 10 ~ 30mm thick sheet. In the past, the sheet metal cutting was often carried out by manual gas cutting. Not only the kerf width was wide, the heating time was long, the sheet deformation was large, but also used for cutting the middle and low carbon steel plates. The production efficiency was low and the labor intensity was large. I plant NC plasma cutting machine is characterized by arcing, arc and any step speed changes, etc. are included in the program, and with the exception of the arc when the suspension and resumption of arc function, the cutting accuracy up ± 0.3mm, cutting surface roughness up to Ra25 ~ 12.5μm, the width of the plate kerf 1.5 ~ 2mm. Compared with the manual gas cutting, saving plate