基于FDM技术的3D打印首饰模型铸造工艺设计

Design of FDM⁃based casting process of 3D printing jewelry model

传统铸造工艺铸浆成型的固化程度不够充分,导致模型抗拉强度较差。为此,文中设计一种基于FDM技术的3D打印首饰模型铸造工艺。该铸造工艺首先需配比硅砂、粘合剂、固化剂和润滑剂,制备3D打印专用覆膜砂;其次,充分混合纯净水和覆膜砂,使其在铸筒底部堆积铸浆,再利用FDM技术构建首饰三维几何模型,由计算机控制喷头运动轨迹,使铸浆覆盖在模具截面上得到固化成型的首饰模具,之后,控制焙烧炉的时间和温度,焙烧成型模具;最后,用水洗去灰得到首饰模型。在两项工艺的对比实验中,利用焙烧炉调控测试温度和压强,其最终结果表明,此次铸造工艺提高了模型抗拉强度,模型力学性能高于传统铸造模型。

The slurry curing degree of the traditional casting process is not sufficient enough,which leads to the poor tensile strength of the model.Therefore,the 3D printing jewelry model casting process based on FDM technology is designed.First of all,the mixing proportion of silica sand,adhesive,curing agent and lubricant is needed to prepare the special coated sand for casing process of 3D printing.Secondly,some pure water and coated sand are mixed sufficiently to accumulate casting slurry at the bottom of the casting cylinder.After that,the 3D geometric model of jewelry is constructed by using FDM technology.The movement track of nozzle is controlled by computer to make the casting slurry be covered on the cross section of the mold to obtain the jewelry mould.The time and temperature of baking furnace are controlled to roast the jewelry mould and the jewelry model is obtained after washing and removing ash.The experiment results show that the casting process improves the tensile strength of the model,and the mechanical properties of the model are higher than those of the traditional casting model.