3D tool path generation for micro-abrasive jet machining on 3D curved surface

Micro-patterns can be carved by jetting fine particles onto the surface of a workpiece. A mask structure is required to classify the surface regions to be machined. This mask is a plate with a hole that corresponds to the pattern to be carved. Abrasive particles are used to erode the workpiece through the hole in the mask. Recently, abrasive jet machining technology has been applied to workpieces with three-dimensional curved surfaces. To utilize the technology for a three-dimensional workpiece, a mask structure needs to be built on the workpiece. Microstereolithography can be used to build this three-dimensional mask for the workpiece. Consequently, process planning technology for the movement of the abrasive jet nozzle should be developed. It should follow the three-dimensional mask and workpiece at a specific distance to achieve uniform machining and a better surface finish. This paper introduces a process planning technique that can automatically generate a three-dimensional machining path for a three-dimensional mask and workpiece. A verification example and an application example are also shown.