热处理工艺对3D打印PLA试件力学性能的影响

发布时间：2018-12-16 12:58

【摘要】：在熔融堆积成形制造技术中,成形制品的热处理工艺对于其力学性能和外观有较大影响。以熔体微分粒料3D打印机为实验平台,以PLA为实验材料,在相同工艺参数下,打印15个拉伸试件,并将其分成5组,其中,第一组不做处理,第二至第四组分别在不同的温度下进行热处理。将5组试件进行拉伸测试,得到每组平均最大拉伸强度,并取样进行X-射线衍射分析,通过Jade软件对图谱进行结晶度计算,得到了在不同温度下试件的结晶度,分析了热处理温度、最大拉伸强度、结晶度之间的相互关系。实验结果表明:随着热处理温度的提高,试件的最大拉伸强度和结晶度都呈先增大后减小的趋势,且试件的拉伸强度和结晶度成正相关关系。热处理温度在100~120℃之间时,试件的拉伸强度最大;在100℃时,结晶度达到最高。仅从试件的拉伸强度考虑,最佳热处理温度为100℃。
[Abstract]:The heat treatment of the products has great influence on their mechanical properties and appearance. Using a 3D printer of melt differential granular as the experimental platform and PLA as the experimental material, 15 tensile specimens were printed under the same process parameters and divided into 5 groups, among which, the first group did not do the processing. The second to fourth groups were treated at different temperatures. The average maximum tensile strength of each group was obtained by tensile test of five groups of specimens. The crystallinity of the samples was calculated by Jade software, and the crystallinity of the samples was obtained at different temperatures. The relationship among heat treatment temperature, maximum tensile strength and crystallinity was analyzed. The experimental results show that the maximum tensile strength and crystallinity of the specimens increase first and then decrease with the increase of heat treatment temperature, and the tensile strength and crystallinity of the specimens are positively correlated. When the heat treatment temperature is between 100 鈩，

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