Finite element analysis and optimization in fixture design

Fixturing locating point synthesis considers the workpiece and the fixturin g elements to be rigid, but however they are elastic and deformable. To ens ure sustained quality of manufacture to meet the design tolerances, fixture design must be predictably repeatable. This paper is concerned with minimi zing deformation of the workpiece due to machining loads about fixturing su pport positions, especially in thin castings. Finite element analysis is us ed in simulating the deformation of the workpiece at selected points. An op timization algorithm is developed to minimize deflections at these selected nodal points by considering the support and tool locations as design varia bles. The resulting support locations and tool point designs ensure part su pport, kinematic closure and minimal workpiece deflections during machining .