Additive Manufacturing

JUL 2018

ADDITIVE MANUFACTURING is the magazine devoted to industrial applications of 3D printing and digital layering technology. We cover the promise and the challenges of this technology for making functional tooling and end-use production parts.

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JULY 2018 Additive Manufacturing 20 TAKING SHAPE One-Piece Robot Gripper Actuated by Shop Air By Peter Zelinski Additive manufacturing is an enabler to robotic automation, and the chief link between this automation and additive is the point at which the robot connects with its payload. 3D printing enables greater design freedom, lower cost and shorter lead time in producing custom grippers and end effectors for robotic applications. IAM 3D Hub in Barcelona, Spain, recently developed a robot gripper that illustrates not only this link between robots and additive, but at least two other im- portant points about AM as well—namely, the promise of part consolidation and the potential AM offers to realize transformative product functionality. That function- ality is found in its actuation; the pneumatically-driven gripper is moved entirely by shop air, requiring no electrical connection. The actuator mechanism essentially expands like a balloon, closing the gripper's fingers when air pressure is applied. The gripper was printed in one piece on an HP Multi Jet Fusion 3D printer. The part consolidation here thus achieves not just an assembly unified into one piece, but more: a working mechanism made in one piece through a single additive build. Further, the fully dense polymer of the build, HP's 3D High Reusability PA 12, deliv- ers the airtightness that allows for pneumatic operation. That polymer also offers the resiliency allowing the gripper's spirals to function as springs. The material has proven durable, too. IAM 3D Hub reports it has been used successfully in a pick-and-place operation through one million cycles. See video of the gripper in action at The robot gripper was made in one piece from PA 12 material. It illustrates not just part consolidation to realize a complete assembly, but part consolidation to realize a complete working mechanism through 3D printing. Large Scale 3D Printing of Production • Tooling • Masters • Molds • Plugs • Fixtures

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