工艺参数对尼龙6选择性激光烧结制件致密度的影响

针对高性能聚合物尼龙6材料的选择性激光烧结(SLS)工艺,研究了不同激光功率与扫描速度对成型件致密度的影响并进行了工艺优化。实验中激光功率10~50 W,扫描速度1 000~5 000 mm/s,其他工艺参数保持恒定。引入能量密度对激光功率与扫描速度的综合作用进行研究。结果表明:随着激光功率的增加或扫描速度的增大,制件的致密度呈现先增大后减小的趋势;随着能量密度的增加,制件的致密度呈现先增大后减小的趋势。在不同工艺参数下,获得制件的最大致密度为86.74%,此时激光功率为30 W,扫描速度为2 000mm/s,能量密度为0.043 J/mm^2。选定致密度为衡量指标,通过响应面回归分析模型建立了激光功率、扫描速度与致密度的优选工艺图谱,得到最优的工艺参数为激光功率45 W,扫描速度3 465 mm/s,此时预测的制件致密度为88.971%。

Effect of Process Parameters on the Density of Selective Laser Sintering for Polyamide 6

The selective laser sintering(SLS) process of high-performance polymer material polyamide 6 was investigated. The effects of different laser powers and scanning speeds on the density of formed parts were studied and the process optimization was carried out. The laser power was from 10~50 W with the scanning speed from 1 000 to 5 000 mm/s, and other process parameters were kept as constant. The energy density was introduced to study the combined effect of laser power and scanning speed. The results show that with the increase of laser power or the increase of scanning speed, the density of the parts increased first and then decreased. With the increase of energy density, the density of the parts increased first and then decreased. Under different process parameters, the maximum density of the obtained parts was 86.74%, with laser power 30 W, and scanning speed 2 000 mm/s, and the energy density was 0.043 J/mm^2. Density was selected as the measurement index, and the optimal process map of laser power, scanning speed and density was established by response surface regression analysis model. The optimal process parameters were laser power 45 W and scanning speed 3 465 mm/s. At this time, the predicted product density was 88.971%.