Analysis of surface quality and optimization of process parameters in laser-assisted cutting of SiC ceramics

Abstract

In order to improve the surface quality of laser-assisted turning silicon carbide (SiC) ceramics, the effects of laser power, rotational speed, cutting depth and feed speed on surface quality are investigated. Taking the surface roughness as the characterization value, the reasonable selection range of each factor is determined by the numerical simulation results of temperature field and the single factor experiment results; orthogonal experiments and range analysis are performed on laser power, rotational speed, cutting depth and feed speed, the primary and secondary order of influence on surface roughness and the optimal combination of process parameters are obtained. The surface topography of the cutting area was observed by 3D digital microscope and the surface roughness is calculated. Taking surface roughness as the evaluation index, the reasonable selection range of each factor is obtained through temperature field simulation and single factor experiment results analysis as follows: laser power 230~245 W, rotational speed 1500~1650 r/min, cutting depth 0.1~0.2 mm, and feed speed 2~4 mm/min. Through orthogonal experiment and range analysis, the order of the significant degree of the influence of various process parameters on surface roughness and the optimal combination of process parameters are obtained. The order of the significant degree of the influence of various process parameters on surface roughness Ra is as follows: laser power (P) > cutting depth (ap) > feed speed (f) > rotational speed (n); the optimal combination of process parameters is as follows: laser power 235 W, rotational speed 1620 r/min, cutting depth 0.1 mm and feed speed 2 mm/min. Compared with the surface quality of original workpiece, the surface of the SiC workpiece processed under the optimal combination of process parameters has no cracks and damage marks, and the surface roughness is reduced to 0.293μm, which significantly improves the surface quality of the SiC workpiece.

Study of the surface roughness and optimization of machining parameters during laser-assisted fast tool servo machining of glass-ceramic

“…Chen Cao conducted research on SiC laser-assisted turning and found through experiments that plastic processing occurs when the laser power is 185-225 W. The minimum roughness obtained is 0.45 μm [23]. Di Dai used TM to study the influence of laser power, spindle speed, cutting depth and feed speed on the surface roughness of laser-assisted turning of SiC, and the surface roughness was reduced to 0.293 μm under the optimal combination of process parameters [24]. In recent years, LAM has also been gradually applied to single-point diamond turning.…”

Online acoustic emission measurement of tensile strength and wear rate for AA8011-TiC- ZrB2 hybrid composite

“…Porosity, also known as the void fraction, is a measure of the void or empty spaces that are present in a material. Porosity is calculated as a proportion of the volume of voids relative to the total volume of the material [15][16][17][18][19][20][21][22][23][24]. The corrosion behavior of AA8011-ZrB2 composites was investigated using an in situ approach, and the presence of ZrB2 was verified using XRD and EDS.…”