The Application of Chip Removal and Frictional Contact Analysis for Workpiece-Fixture Layout Verification

Mathematical methodology for optimization of the clamping forces accounting for workpiece vibratory behaviour

“…The constraint (17) represents the static equilibrium condition; (18) results from the fact that constant clamping forces are used; (19) represents the Coulomb friction law; (20) comes from the unilateral nature of a fixture-workpiece contact; (21) represents the non-yielding constraint on the contact stress where S y is the yield strength of the workpiece material while a i is the radius of the ith contact region and is a function of the normal force P i . The forces are then substituted into the contact force-displacement relationship to calculate the contact elastic deformation due to clamping.…”

“…Li and Melkote [16] modelled the change of the workpiece gravity during machining. Kaya and Ozturk [17] applied an FE-based element death technique to simulate the chip removal process for fixture layout verification. However, both papers treat the fixture-workpiece system as quasi-static.…”

Workpiece and Tool Handling in Metal Cutting Machines

“…The workpiece fixture layout verification analysis is carried out for time varying machining forces to ensure that the workpiece will be held against the cutting and clamping forces [44]. To reduce inventory, fixtures that are no longer used can be dismantled and recycled for further clamping purposes [45].…”

Modelling of Dynamic Compliance of Fixture/Workpiece Interface

“…Hurtado and Melkote [12] formulated a multi-objective optimization model that defines minimum clamping loads to achieve workpiece shape conformability and fixture stiffness goals for a workpiece subjected to quasi-static machining forces. Kaya and Ozturk [13] simulated the machining operations by using a FEA model. The machining forces were considered as area force and applied over the tool workpiece contact area.…”