Abstract: The digital design of mold for plastics parts based on reverse engineering technology was introduced. Using the mold for car lamp reflector as an example, the analysis of plastics products in the reverse modeling process was illustrated, with the basic principles and main points emphasized. During the analysis, point cloud data of the reflector shell surface was first collected using a LaserRE 3d laser scanner, then using the Geomagic Studio software for data processing and rapid surface reconstruction, finally imported the surface model into Pro/E software for threedimensional model reconstruction and die parting of the reflector, and formed a mold cavity. The practice showed that, without missing the original geometrical data for parts with complex curved shapes, this method could realize the rapid design of an injection mold, shorten the product development cycle.

Key words: reverse engineering, mold, model reconstruction, car lamp reflector