Precision localization and robust force closure in fixture layout design for 3D workpieces

Addresses two issues in fixture layout design for 3D workpieces: (1) precision workpiece localization and (2) robust force-closure. An analysis is given to quantify these two fundamental requirements. Based on a concept of optimum experiment design, the optimal fixture design problems are treated to select optimal locators and clamps. An interchange algorithm is described, in which the fixture locators are generated sequentially first and are further improved. The algorithms use multiple criteria to balance the demands for precision localization and robust force closure. Examples are presented to illustrate the issues and to show the effectiveness of the proposed approach