الفهرس 
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Abstract
The current investigation presents a study of laser machining for armored steels (500HB) and X10. The effect of working parameters, laser power (P), gas pressure (GP) feed rate (F) and motor speed (S) on the process of grooving machining were investigated. The groove dimensions depth of cut (DC), upper cut width (UC) and lower cut width (LC), root round error and metal removal rate (MRR) were studied under different working parameters. The performance of the two gas assisted laser nitrogen and oxygen on the machining process were compared. An experimental study was presented through performing series of designed experiments. For this purpose, Work piece holding and rotating device was designed and fabricated. The experimental results are statistically analyzed and mathematically modeled through response surface methodology (RSM). The results showed that, the metal removal rate (MRR) increases with increase of Laser power, while the motor speed has a moderate effect on the machining of armox steel using N2- gas. Also, the metal removal rate increases with the increase of gas pressure and feed rate. Increasing laser power, gas pressure and feed rate have directly affected on increasing the depth of groove and round error during the machining of armox steel using N2- gas. Depth and width of groove and roundness error increase with increasing of Laser power and gas pressure, but MRR decrease with the increase of feed rate.
The motor speed affects moderately on the machining of Laser machining for armox steel by using O2- gas. The metal removal rate, depth of groove, and width of groove and roundness error increase with increasing of Laser power and gas pressure and feed rate. Regarding armored steel X10, the motor speed has a moderate effect during the machining of X10 using O2 and N2 gases. The metal removal rate, depth of groove, width of groove and roundness error increase with increasing the Laser power, gas pressure and feed rate. A trail has been given to optimize the process characteristics under different working condition and the results showed that, laser turned process assisted by oxygen was better than Laser turned process assisted by nitrogen. Laser turned process assisted by nitrogen for X10 was better than armox steel (500HB).