Rajendran Prithvirajan, Ganesan Arumaikkannu
Department of Manufacturing Engineering, College of Engineering Guindy, Anna University, Chennai, India.
3D Print Addit Manuf. 2024 Jun 18;11(3):e1186-e1195. doi: 10.1089/3dp.2022.0249. eCollection 2024 Jun.
Selective laser sintering (SLS) is a powder bed fusion additive manufacturing process that uses polymer powders to produce functional parts directly from digital 3D models. SLS supports small- to medium-batch fabrication of customized products for various end-use applications. These parts can be used as tooling to support conventional manufacturing and inspection where mechanical and tribological behaviors are important. This article evaluates the friction behavior of parts fabricated by SLS polyamide (PA12) and glass bead-filled polyamide (PA-GF) materials. Pin-on-Disk tribometer was used to characterize the behavior in dry sliding conditions with part build orientation, load, and speed as factors. Taguchi's approach and analysis of variance are used to quantify the influence of these factors on the friction coefficient. Both materials show reduction in friction coefficient with the increase in load; on the other hand, an increase in speed affects adversely. However, the influence of part orientation is comparatively lesser than the other two factors considered in this study. The debris, pin, and disk wear surfaces were examined to learn wear mechanisms. It is observed that surface porosity resulting from the fabrication process plays a significant role in friction behavior. The glass beads in PA-GF material function as reinforcement against load and influences the friction behavior. Low friction and wear characteristics make both materials as a prospective contender for tooling application.
选择性激光烧结（SLS）是一种粉末床熔融增材制造工艺，它使用聚合物粉末直接从数字3D模型生产功能部件。SLS支持为各种最终用途应用进行小批量到中批量的定制产品制造。这些部件可用作工具，以支持在机械和摩擦学行为很重要的传统制造和检测。本文评估了由SLS聚酰胺（PA12）和玻璃珠填充聚酰胺（PA-GF）材料制造的部件的摩擦行为。使用销盘摩擦计来表征在干滑动条件下以部件构建方向、载荷和速度为因素的行为。采用田口方法和方差分析来量化这些因素对摩擦系数的影响。两种材料的摩擦系数均随载荷增加而降低；另一方面，速度增加会产生不利影响。然而，部件方向的影响相对小于本研究中考虑的其他两个因素。对碎屑、销和盘的磨损表面进行了检查，以了解磨损机制。观察到制造过程产生的表面孔隙率在摩擦行为中起重要作用。PA-GF材料中的玻璃珠起到增强载荷的作用，并影响摩擦行为。低摩擦和磨损特性使这两种材料成为工具应用的潜在竞争者。
