Metal additive manufacturing technology is accelerating development in the automotive sector, as shown by the repeated success of the Bugatti sports car brand in achieving consistent function integration and significant performance optimization of 3D-printed components.
Sparks fly during the dynamic bench testing of a Bugatti brake caliper, the volumetrically largest functional titanium component built with selective laser melting to be tested.
Testing the 3D printed brake caliper from Bugatti.
"Proof that additively produced metal components can cope with extreme strength, stiffness and temperature requirements at speeds of over 375 km/h with a braking force of 1.35g and brake disc temperatures up to 1,100°C," says Frank Götzke, Head of New Technologies at Bugatti. The caliper test showed that a tensile strength of 1,250 N/mm² and a material density over 99.7 percent was achieved.
The component was manufactured in an aerospace alloy on an SLM® 500 featuring four 400W lasers.
Bugatti utilizes selective laser melting not only for lightweighting, but also within the functional scope of its vehicles.
Built on the SLM® 500, this Bugatti brake caliper is the volumetrically largest functional titanium component in the world.
"We always strive for absolute perfection, stylistic as well as technical, as well as considering the perfect synergy of both elements -- the tradition of Ettore Bugatti we uphold," Götzke stated.
The active spoiler bracket, manufactured on an SLM® 500 with Fraunhofer IAPT (formerly Laser Zentrum Nord), represents this combination, aiding the 1,500hp vehicle to reach speeds of 400 km/h in just 32.6 seconds and bringing it back to a stop in just nine seconds. The active rear spoiler can be adjusted in height and angle, supporting the sophisticated aerodynamics required.
Bugatti teamed with Siemens to optimize the bracket for production and reduce the number of iterations needed to optimize for weight and rigidity. Utilizing 3D printed titanium, the spoiler bracket was reduced by 5.4kg, a weight reduction of 53 percent, yet increased rigidity while sacrificing no functional benefits.
Additively manufactured spoiler bracket on an SLM® 500
With fewer sparks but no less intrigue, a small bracket with integrated water cooling acts an active heat shield to boast a remarkable reduction in transferred heat. The motor bracket has been installed in all series vehicles since the delivery of the first Bugatti Chiron from the supercar manufacturer's production facility in Molsheim, France.
The Chiron, like its predecessor, the Veyron, has two separate water-cooling circuits to keep the component and system temperatures at an acceptable level, even under the most extreme environmental and operating conditions. The high-temperature circuit is used to cool the 1,500hp W16 engine of the supercar, while the low-temperature circuit ensures that the intake charge cooling temperature remains suitably low.
A bypass flow filter of the NT circuit supplies the console while isolating the electronic components from the temperatures of the transmission oil tank. The primary task of the bracket is to engage the gears while opening and closing the two clutches of the 7-speed dual-clutch transmission while including the control unit. As a result, the temperature at the electric motor and at the control unit of the pump when driving through a demanding handling course can be lowered from 130°C to 90°C, a reduction of 40°C.
The bracket, which was manufactured on an SLM® 280 Twin, was commissioned by SLM Solutions at Rolf Lenk Werkzeugbau GmbH.
Up to five large-format SLM® 800 selective laser melting machines can be connected to an SLM® HUB for fully automated operation, powder handling and unpacking.
However, the start of the cooperation between the Volkswagen subsidiary Bugatti and the SLM Solutions Group AG dates back to the design, calculation and later production of a bionically optimized front axle differential housing at the end of 2014.
Bugatti manager Götzke recalls a meeting more or less by chance in the parking lot of the Volkswagen Tor Ost headquarters in Wolfsburg, stating that this was "a real stroke of luck" that continues today. Ralf Frohwerk, Global Head of Business Development at SLM Solutions, the first and current Bugatti contact at SLM, emphasizes that this has indeed resulted in a very trusting cooperation from the outset.
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