英语翻译Lasers are used as cutting tools due to high precision of operation and desirable end product quality.In laser cutting process,an assisting gas jet is used.In the case of inert gasassisted processing,assisting gas protects the surface fro

英语翻译Lasers are used as cutting tools due to high precision of operation and desirable end product quality.In laser cutting process,an assisting gas jet is used.In the case of inert gasassisted processing,assisting gas protects the surface fro
英语翻译
Lasers are used as cutting tools due to high precision of operation and desirable end product quality.In laser cutting process,an assisting gas jet is used.In the case of inert gasassisted processing,assisting gas protects the surface from high temperature oxidation reactions while high temperature exothermic reactions takes place when oxygen is used as assisting gas.In laser gas assisted processing,proper selection of laser and workpiece parameters (cutting parameters) increases the laser cutting efficiency and improves the end product quality.
Considerable research studies were carried out to investigate the laser heating process .The analysis of acoustic sensing for laser grooving and cutting was carried out by Sheng and Chryssolouris [9].They introduced the process control scheme for groove depth and beam breakthrough regulation for laser cutting process.Surface temperature due to a moving laser beam was formulated by Romer and Meijer [10].They presented two types of approximating functions relating the scanning speed to the maximum surface temperature.Three-dimensional conduction model in relation to laser machining process was introduced by Modest[11].He predicted the shape of a developing groove that was formed by ablation of material by a stationary as well as moving laser beam.Temperature field during laser forming of sheet metal was examined by Ji and Wu [12].They employed finite element method when solving the governing equation of heat transfer.They showed that temperature gradient in a depth below the surface increased with increasing of laser power and workpiece thickness while it decreased by laser beam scanning velocity.A dual gas jet
laser cutting process involving co-axial and off-axial oxygen gas flows was investigated by Hsu and Molian [13].They showed the effectiveness of the dual gas-jet in achieving the maximum machining rate without deteriorating the cut quality.
The turbulent boundary layer approach allowing chemical reactions for CO2 laser oxygen-assisted cutting process was introduced by Yilbas and Sahin [14].They showed that heat transfer to the liquid metal decreased with increasing workpiece thickness.The thermal analysis of laser cutting process was studied by Yilbas [15].He indicated that the mathematical model employed presented the physical phenomena well,with the limit of characteristic distance,striation frequency and striation width,as predicted,agreeing well with the experimental findings.A numerical study for CO2 laser cutting process was carried out by Yilbas [16].The melting front velocities at different laser output power and workpiece thickness were predicted.In laser cutting process,the end product quality is the determining factor for the successful machining operation.

英语翻译Lasers are used as cutting tools due to high precision of operation and desirable end product quality.In laser cutting process,an assisting gas jet is used.In the case of inert gasassisted processing,assisting gas protects the surface fro
由于激光操作精度高,切割成品质量令人满意而被用作切割工具.在切割过程中将使用辅助气体.在有惰性气体辅助的过程中,辅助气体保护表面免受高温氧化反应影响,而当氧气作为辅助气体时,将产生高温放热反应.在激光气协助过程中,应选用恰当的激光以及工件参数（切割餐数）,将提升激光切割的效率,提高最终产品质量.