Vibrations during 3D printing either slow down the process or warp the parts, but a new software developed by University of Michigan spinoff Ulendo could enable manufacturers to keep up the speed without sacrificing accuracy. The product is being launched at North America’s largest additive manufacturing conference, the RAPID + TCT Conference.
The software essentially serves as a translator between the commands that would print the part in a perfect world, and how the machine needs to compensate for vibrations in the real world. It works for printers that mechanically move a printhead.
“If you want to reduce vibration in a moving object, most times you can do that by slowing down. But as 3D printing is already very slow, that solution creates another problem,” said Chinedum Okwudire, U-M associate professor of mechanical engineering and founder of Ulendo. “Our solution allows you to print fast without sacrificing quality.”
As a result, printers could double their speed without consuming much more energy, potentially reducing the cost per printed part as well.
The Ulendo software is called FBS, which stands for Filtered B Splines. That technical name refers to the mathematical function Okwudire’s team used to translate the machine commands from the ideal expectation to commands that would compensate for vibration in the 3D printer.
Molong Duon and Deokkyun Yoon, both mechanical engineering PhD students, and Chinedum Okwudire, associate professor in mechanical engineering, have developed what they call “filtered b-spline” algorithms to speed up consumer 3-D printers without sacrificing quality. Desktop 3D printers often use light and flexible parts to save costs and stay affordable, but this allows for unwanted flexing and vibrations when the movement of the printhead is accelerated. These vibrations can offset the printhead, and because the printer uses a stepper motor, it won’t know there is a problem and will keep printing, resulting in an incredibly deformed final product. The Michigan Engineering researchers developed algorithms that take into account the dynamics of the printer and refine the movement of the printhead and platform to mitigate vibration errors. Photo: Evan Dougherty/Assistant Multimedia Editor – University of Michigan – College of Engineering
“Say you want a 3D printer to travel straight, but due to vibration, the motion travels upward. The FBS algorithm tricks the machine by telling it to follow a path downward, and when it tries to follow that path, it travels straight,” Okwudire said.
Manufacturing on Demand
Okwudire first began thinking about software solutions for vibrations while working in the industry, faced with a high-precision milling machine tool that was vibrating. His team couldn’t stiffen the machine to prevent vibrations, so they were forced to slow it down.
Beginning at U-M as a professor in 2011, Okwudire had the freedom to design software that could overcome machine vibrations. Then in 2017, a mechanical engineering graduate student from Okwudire’s lab implemented the software on a 3D printer.
When the research was highlighted with a YouTube video, commenters made the market for the solution apparent, and Ulendo was born through Innovation Partnerships at U-M. Much of the commercial development was funded through an MTRAC grant from the Michigan Economic Development Corporation and a Small Business Innovation Research grant from the National Science Foundation.
“Members of the 3D printing industry have the same jaw-dropping reaction I had when I first heard about how this technology results in a printer operating at two times the speed and 10 times the acceleration,” said Ulendo CEO Brenda Jones.
Okwudire and his team will work on expanding the algorithm to other kinds of machines, including robots, machine tools, and more types of 3D printers. At RAPID + TCT, he will also present on his lab’s latest technology, SmartScan. This software intelligently moves a laser beam around to prevent warping due to heat buildup in parts printed through powder bed fusion, a technique that melts powder into 3D-printed parts.
The University of Michigan has a financial interest in Ulendo.
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Author: 3D Printing Media Network
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