高温FDM喷头的有限元建模及温度场仿真

利用ANSYS有限元仿真软件,针对复合材料的高温熔融沉积(Fused Deposition Modeling,FDM)打印喷头进行了物理建模以及温度场仿真,为解决3D打印喷头由于受热不均引起的喷头堵塞,从而导致产品的翘曲变形、不光滑等问题提供了帮助.针对已有的喷头形状,选择铝合金、不锈钢、紫铜、钨等材料进行了温度场仿真。结果表明:不锈钢和紫铜材料的喷头温度均在200℃以上,满足ABS所需的170℃以上熔融温度,较好地符合了要求;而铝合金以及钨则存在温度区间低于170℃的区域,易造成喷头的凝固堵塞。在此基础上,对喷头形状进行了尺寸形状创优化,通过増加薄壁区的厚度.使喷头的温度分布更加合理,避免应力集中,防止喷头薄壁处变形、堵塞等。

Finite Element Modeling and Temperature Field Simulation of High Temperature FDM Sprinkler

The ANSYS finite element simulation software was used to carry out physical modeling and temperature field simulation for the high temperature fused deposition printing nozzle of composite materials. The problems of warpage deformation and surface unevenness of printing products caused by nozzle clogging due to uneven heating were sovled. According to the shape of the existing nozzle, the temperature field simulation was carried out by selected materials such as aluminum alloy , stainless steel, copper, and dock. The results showed that the sprinkler temperatures of stainless steel and copper materials were above 200℃, which met the requirements of ABS melting temperature ( above 170℃). However, aluminum alloy and dock were below 170℃, which was easy to cause solidification blockage. On this basis T the shape of the sprinkler was optimized. By thickening the thickness of the thin-walled area, the temperature distribution of the sprinkler was more reasonable , the stress concentration could be avoided , and the deformation and blockage of the thin-walled part of the sprinkler could be dissolved.