Lluch-Cerezo Joaquín, Meseguer María Desamparados, García-Manrique Juan Antonio, Benavente Rut
Department of Mechanical Engineering and Materials, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
Engineering Research Team, Florida Universitària, 46470 Catarroja, Spain.
Polymers (Basel). 2022 Jun 27;14(13):2607. doi: 10.3390/polym14132607.
Fused deposition modelling (FDM)-printed parts can be treated with various post-processes to improve their mechanical properties, dimensional accuracy and surface finish. Samples of polylactic acid (PLA) and acrylonitrile butadiene styrene (ABS) parts are treated with annealing to study a ceramic powder mould's effectiveness in order to avoid dimensional part deformation. The variables chosen are annealing temperatures and the usage of a ceramic powder mould to avoid part deformations. A flexural strength test was carried out to evaluate the mould's influence on the mechanical properties of the part. The effectiveness of the mould has been evaluated mainly attending to the length of the part, because this is the dimension most affected by deformation. A polynomial approximation to a deformation's length and the effectiveness of the mould allows for their prediction. Results obtained show that effectiveness increases with the annealing temperature. Nevertheless, mould effectiveness decreases when parts are fabricated with PLA, because it is a semi-crystalline thermoplastic, and it suffers a lower shrinkage during thermal post-process than amorphous polymers such as ABS. Attending to the flexural strength test, mould has no significant influence on the mechanical properties of the treated parts in both materials studied.
熔融沉积成型（FDM）打印的零件可以通过各种后处理来改善其机械性能、尺寸精度和表面光洁度。聚乳酸（PLA）和丙烯腈-丁二烯-苯乙烯（ABS）零件的样品经过退火处理，以研究陶瓷粉末模具在避免零件尺寸变形方面的有效性。选择的变量是退火温度和使用陶瓷粉末模具以避免零件变形。进行了弯曲强度测试，以评估模具对零件机械性能的影响。主要根据零件的长度来评估模具的有效性，因为这是受变形影响最大的尺寸。对变形长度和模具有效性进行多项式近似可以对它们进行预测。获得的结果表明，有效性随着退火温度的升高而增加。然而，当用PLA制造零件时，模具的有效性会降低，因为PLA是一种半结晶热塑性塑料，与ABS等无定形聚合物相比，它在热后处理过程中的收缩率较低。根据弯曲强度测试，在所研究的两种材料中，模具对处理后零件的机械性能没有显著影响。
