Ultrasonic moulding is a new technology that uses high power ultrasound to melt and mould thermoplastic polymers to produce samples with mini and micro features. The main feature of this technology is the use of ultrasonic energy as the heating source instead of a conventional injection screw. Even if ultrasonic moulding overcomes some of the drawbacks of conventional mini and micro-injection moulding, it still presents two main limitations that are hindering its widespread applicability: the lack of stability of the process and the difficulty to obtain samples with good mechanical properties for some materials. This article presents a new configuration, called nodal point ultrasonic moulding (NPUSM), to surmount such limitations. This configuration improves the stability of ultrasonic moulding technology and it is capable of processing materials with good mechanical properties. To prove its efficacy, the nodal point ultrasonic moulding configuration is used to obtain the processing window of a polyoxymethylene material and these results are compared with standard ultrasonic injection and conventional injection moulding. The results obtained show that NPSUM configuration improves the capabilities of ultrasonic moulding technologies.

超声波成型是一项新技术，它使用高功率超声波来熔化和成型热塑性聚合物，以生产具有微型和微型特征的样品。该技术的主要特点是使用超声波能量代替传统的注射螺杆作为加热源。即使超声成型克服了常规微型和微型注射成型的一些缺点，它仍然存在两个主要限制，这阻碍了其广泛的适用性：缺乏工艺稳定性和难以获得某些样品具有良好机械性能的样品材料。本文介绍了一种新的配置，称为节点超声成型（NPUSM），以克服这些限制。这种配置提高了超声成型技术的稳定性，并且能够处理具有良好机械性能的材料。为了证明其功效，使用节点超声成型结构来获得聚甲醛材料的加工窗口，并将这些结果与标准超声注射和常规注射成型进行了比较。获得的结果表明，NPSUM配置提高了超声成型技术的能力。