Ford Motor Company recently developed a dedicated additive manufacturing research program to explore the potential of this technology to manufacture final parts that will eventually hit the road. “If we can shave months off of production time and get a new model onto the market earlier, we can save millions,” said Ellen Lee, team leader in additive manufacturing research at Ford.
Several challenges face Ford in using a 3D printing as a manufacturing tool. The first issue is a fundamental one — conventional 3D printing technologies make parts layer-by-layer, slowly crafting one layer at a time, creating parts that aren’t nearly as robust as those stamped or injection molded. While the slow speed of this process is a drawback, the bigger problem is that the parts produced are not isotropic and not durable enough to be used in production vehicles.
Most parts used in vehicles today must withstand temperature extremes from the hottest desert to the coldest Arctic environments and still maintain their integrity. With only a handful of stock materials available for 3D printers, meeting the automaker’s unique demands has not been possible.
In 2014, Carbon demonstrated Continuous Liquid Interface Production technology (CLIP) to Ford’s additive manufacturing group. “It was really exciting to see the resulting mechanical properties. There were a lot of things we saw in the technology that would address the main challenges, and we decided to investigate,” Lee said. The team was eager to join Carbon’s early access program and begin using one of the devices. Ford has been working with a pre-release version of Carbon’s first device to evaluate its ability to produce commercial-quality polymeric parts by unlocking mechanical properties unattainable with other 3D printing technology.
Ford has already used the CLIP-based device to grow elastomer grommets for the Focus Electric and test them against those made by traditional 3D printing methods. The soft but sturdy grommets protect wiring on the inside of the door from being damaged when the door opens and closes. The Ford team used CLIP to produce the grommets in less than a third of the time and with material properties much closer to the final properties desired for the part. In a similar project, several alternative designs were evaluated for a damping bumper part on the Ford Transit Connect. The game-changing manufacturing time of the CLIP process allowed engineers to make design iterations more quickly than with traditional methods.
Most recently, Ford needed to address a major engineering issue that arose after placing a V8 engine into a new vehicle body design. The vehicle’s design created an unreachable oil filler cap because the engine sat lower and farther back under the hood. The product engineering team realized the opportunity to quickly address the issue using Carbon’s CLIP based device. The team was able to rapidly design, prototype and manufacture an oil connector using rigid polyurethane and elastomer materials to access the oil fill tube without needing major redesigns to several components of the vehicle.
When it comes to realizing Ford’s ambitions to use additive manufacturing as a manufacturing technology, nothing is more important than having the right materials. Thanks to Carbon’s commitment to polymer chemistry and the unique advantages CLIP technology has to support an incredibly broad range of materials, Ford has been able to significantly expand their own materials research efforts. To date, the team has tested several materials, including resins reinforced with nano-sized particles and is eager to further investigate resin modifications for improved mechanical properties and consider the creation of thermally and electrically conductive materials for future vehicle applications.
“Carbon’s CLIP technology is allowing our engineers to shorten their design iteration time and reach a final-part more quickly, which is exciting because it means higher quality and more cost effective products for our customers,” explained Lee.