Undeterred, the INTENSE production team looked to the AM process as a solution. They chose to team up with TRUMPF, a high-tech company that offers a broad range of manufacturing solutions including 3D printers. TRUMPF was selected because they offer a reliable and robust AM solution. But what closed the deal for INTENSE was TRUMPF’s experience with 3D printing bike parts and the fact that they could 3D print parts out of a weldable version of 6061 aluminum -- Elementum 3D’s A6061-RAM2 -- the same alloy used in INTENSE aluminum frames.
TRUMPF started by offering advice to INTENSE engineers on part design changes to remove many of the low-angle overhangs which would help improve the printability of the component in A6061-RAM2. The first backbone part design iterations were not ideal for printing. Incorporating TRUMPF’s new build processor “TruTops Print” they were able to increase the downskin printability from a 45° angle down to 25°, enabling TRUMPF’s printer to print the INTENSE backbone with much less overhang-supporting material.
While TRUMPF was optimizing the part designs, they worked with Elementum 3D to secure the required A6061-RAM2 feedstock material. The time between initial discussions of the project and material delivery was extremely fast. Even the technical details were finalized in a short time. TRUMPF was then able to immediately confirm the powder would perform well with their existing infrastructure. INTENSE found the A6061-RAM2 alloy to be a perfect fit for in-house prototyping of new bike frames since it can be easily welded and heat treated with the remaining frame parts including thin wall tubing.
Christian Lengwenat, TRUMPF application engineer for metal 3D printing, expressed the impact of Elementum 3D’s involvement in the success of the INTENSE project, stating, “Elementum 3D is a very professional and fast acting company. It is comforting to work with a very reliable and friendly contact. Their advanced material properties and surface finish exceeded our expectation. We are already planning to use more Elementum 3D powders in our machines.”
From the first test build, INTENSE was impressed with the weldability of the A6061-RAM2 powder. It was exactly like working with billet machined 6061 material, no issues with porosity or contamination. TRUMPF was amazed at the predictability of the material’s processability after the first print, which helped to develop a working print parameter in two-weeks. Furthermore, Trumpf only had to print two DOEs to reach the material’s expected relative density value.
Both companies found the A6061-RAM2 powder to be ideal for this project, especially when they saw and felt the stunning surface finish and accuracy of the printed parts. After the backbone part was welded to the frame it was practically impossible to determine which part was printed, machined, or forged due to the superior surface quality.
In appreciation for the amazing AM experience, Jeff Steber remarks, “I am thankful for the great work TRUMPF and E3D provided. Their guidance and expertise played a critical role in the successful production of the new M1 bike. I am happy to report the M1 finished in 2nd place at the 2023 UCI Cycling World Championships!”
Because of the positive results from this project, INTENSE plans to incorporate AM into future bike prototyping projects and -- one day, hopefully -- production parts.
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