A Method for Generation of Random Lattice Structure for Additive Manufacturing Additive manufacturing technologies provide us new opportunities to fabricate a product with much more complex geometry and architecture that conventional manufacturing ones such as turning, milling, grinding, casting and molding do not have the ability to implement. Hence, lattice structures are becoming more popular and used extensively in the industrial product design to minimize the usage of materials due to the additive manufacture technologies. Lattice structures are formed by the cellular unit of structure repeated regularly or irregularly in a design area. However, the creation and generation of these structures for additive manufacturing in the current CAD environment have many difficulties. Therefore, the paper will propose a new approach to design the lattice structure, especially the random one. This approach allows helping product designers to design and generate lattice structure randomly based on the Voronoi diagrams.

Hybrid manufacturing scheme for metal using robot and CNC machine This paper presents a hybrid layered manufacturing process combining the best features of both robotic additive manufacturing and CNC machining approaches. Compare to the conventional manufacturing process, the advantage of the hybrid manufacturing system is that material can be added and subtracted, ad infinitum until a desirable product has been achieved. A slicing algorithm is developed to generate the contour toolpaths along the boundary of the designed model, and these contour curves of each sliced layer are offset to preserve geometrical accuracy. For the internal area of the layer, zigzag toolpaths are adopted to simplify computing processes and speed up fabrication. The hardware integration of this system is described in detail, including the design and use of each subsystem, and the control scheme of the entire system. Finally, a series of experiments are carried out to obtain suitable processing parameters, and an industrial case is conducted subsequently proving the viability of the hybrid system.