Study on process and performance of laser heating assisted micro cutting of alumina ceramics
For the study of alumina ceramic micro turning machining performance, using (IPGPhotonis) fiber laser heating assisted cutting. Due to the high strength and hardness of the alumina ceramics, using cubic boron nitride (CBN) tool for turning experiment. The effects of different processing parameters such as laser power, spindle speed and feed rate on the surface roughness and tool wear were studied. Compared with the experimental results obtained by laser heating and non-laser heating, we found that the surface quality is improved by laser heating, and the service life of the cutter is prolonged.
Tribological Action and Cutting Performance of MQL Media in Machining of Aluminum
The tribological action of MQL media and atmospheric carrier gases was investigated using controlled atmosphere cutting apparatus. The investigation demonstrated their adsorption behavior onto metal surfaces was in close connection with the cutting performance of a lubricant synthetic ester and carrier gases in practical MQL machining. In particular, the presence of oxygen resulted in unfavorable cutting phenomena in MQL machining of aluminum. A unique technique of MQL media treatment was further proposed to prepare oil mist sprays containing microdroplets of water. This advanced technique provided some possibilities of improving the tribological action of MQL media in machining of aluminum.
On laser fusion cutting of metals
The laser fusion cutting of metals is modelled theoretically for high cutting velocities assuming that light absorption occurs according to the classical Fresnel formulae. For a beam polarised in the cutting direction, a threshold intensity for efficient cutting exists. The dependence of the cutting depth and the mean absorbed laser power on the laser intensity and the mode number is discussed. An optimal choice for the laser focus position and the beam divergence is derived.