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为了改善激光选区熔化成型免组装机构间隙结合处的成型质量,制造出具有高表面质量和高致密度的免组装机构,对间隙倾斜面的表面粗糙度进行了理论研究,并对间隙特征进行了设计,分析了激光表面重熔和工艺参数对间隙成型质量的影响。结果表明:间隙倾斜面的表面粗糙度(Ra)理论上由倾斜角和切片厚度两个因素决定,Ra随着倾斜角的增大和切片厚度的减小而减小。采用鼓形孔的间隙特征可以使粉末更容易去除并提高机构的稳定性;采用激光表面重熔工艺,不仅可以提高机构的致密度,也可以改善表面粗糙度。加工过程中,保持激光体能量密度在顺利成型的区域,加工到间隙顶部时,加快扫描速度,能够减少间隙处的挂渣,提高表面质量。采用以上优化条件可以顺利加工出万向节机构,其中外表面Ra=8.25μm,间隙表面Ra=12.47μm,致密度为99.1%。
In order to improve the forming quality of the gap combination of the laser assembly-free assembly mechanism, a high-surface-free assembly mechanism with high surface quality and a high density was fabricated, the surface roughness of the gap inclined surface was theoretically studied, and the gap characteristics The effects of laser surface remelting and process parameters on the quality of gap forming are analyzed and designed. The results show that the surface roughness (Ra) of the slant surface is theoretically determined by the inclination angle and the slice thickness. Ra decreases with the increase of the slant angle and the decrease of the slice thickness. The use of the gap feature of the drum-shaped hole can make the powder easier to remove and improve the stability of the mechanism. The laser surface remelting process can not only improve the density of the mechanism but also improve the surface roughness. In the process of processing, keeping the energy density of the laser body in the smooth forming area and speeding up the scanning speed when processing to the top of the gap can reduce the dross in the gap and improve the surface quality. Using the above optimization conditions can be successfully processed out of the universal joint mechanism, wherein the outer surface Ra = 8.25μm, clearance surface Ra = 12.47μm, the density of 99.1%.