Experimental Investigation On Fiber Laser Assisted Machining Alumina Ceramics

Engineering ceramics has many excellent mechanical and physical propertiessuch as high hardness,strength,anti-oxidation, corrosion resistance, heat resistance,Ithas broad application prospects in the field of space technology, military technology,nuclear, and chemical equipment, etc..Due to the hardness and brittlenesscharacteristics of engineering ceramics,it has been very difficult to be machined withtraditional processing methods.However,laser assisted machining is one of theeffective methods to solve such a problem.In this paper, laser assisted machiningexperimental investigations were conducted with the alumina ceramics.The researchincludes the following contents:Firstly,with the finite meta-analysis methods,a laser assisted machiningmathematical model has been established to simulate the workpiece and tool materialtemperature field,and to analysis the influence of different laser parameters totemperature field theoretically.Secondly,a laser assisted machining alumina test device was built.With theorthogonal experiment method,the five factors and four levels orthogonal tableincluding laser power, workpiece speed, feed rate, cutting depth and laser spotdiameter has been designed.Then, experiments on laser assisted mechining of aluminaceramic were carried on.Finally, the tool wear morphology and surface roughness were measured andanalyzed.The result shows that the main form of tool wears were flankwear.Analysising the different process parameters influence on the tool flank wearwith range anslysis method,the research found that the laser spot diameter flank wearis the biggest affecting factor, followed by workpiece speed, laser power, cuttingdepth and feed rate. Simultaneously, by analyzing the flank wear with differentcombinations of process parameters, the least amount of tool wear process parameterswas achieved: laser power is300W,laser spot diameter is1mm, the feed rate is9.9mm/min, cutting depth is0.1mm, the workpiece rotational speed is250~400r/min.At the same time,using the range analysis method to analysis the workpiece surfaceroughness and the effects of different process parameters on surface roughness,theresults found that workpiece speed is the biggest affecting factor, followed by thecutting depth, feed rate, laser spot diameter and laser power.After analyzing of surface roughness under different combinations of process parameters, the good surfaceroughness parameter combinations was achieved: laser power is200W, the spotdiameter is1.25mm, the feed rate is9.9mm/min, workpiece speed take255r/min,cutting depth is0.1mm.