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Improving Metal Post-Processing with Pulsed Electrochemical Machining

September 29, 2023

Thanks to 3D printing, manufacturing has been graced with reduced costs, material waste, and faster design iteration, especially in the metal AM sector.

However, as demands skyrocket, the minor constraints of AM, including limitations in achieving certain tolerances and features in critical applications, are becoming more noticeable. High demand drives the quest for cost-effective solutions, albeit sometimes at the expense of quality, urging a look into post-processing methods for refining AM parts.

Enter Pulsed Electrochemical Machining (PECM), a novel material removal process spotlighted by Kirk Gino Abolafia from Voxel Innovations. Unlike conventional methods, PECM doesn’t rely on friction or heat. It employs electrochemistry to dissolve workpiece material, achieving superfinished surfaces, small features, and high repeatability. This is particularly useful on metal AM parts, making it a promising secondary machining and post-processing technique.

Improving Metal Post-Processing with Pulsed Electrochemical Machining
Before and after PECM processing. (Image Credit: Voxel Innovations)

PECM shines in dealing with high-volume metal AM parts by significantly improving surface quality and resolution while reducing production costs. For instance, it can slim down the wall thickness of AM parts to less than 0.05 mm, a feat hard to achieve with AM alone. Moreover, its non-contact, non-thermal nature allows machining of sensitive areas without tool wear, making PECM a highly repeatable process.

Notably, PECM’s capabilities extend to critical aerospace and medical device components, showcasing its potential in enhancing performance, durability, and safety of AM products, especially in high-stress or temperature flux environments.

PECM stands out as a complementary solution to AM, addressing surface irregularities and feature size issues, ensuring metal AM parts meet the stringent requirements of critical applications while keeping manufacturing costs in check.

Source: metal-am.com

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About the author | Phillip Keane
Phillip is an aerospace engineer from UK. He is a graduate of Coventry University (UK), International Space University (France) and Nanyang Technological University (Singapore), where he studied Advanced Manufacturing at the Singapore Centre for 3D Printing.
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