The generation of bending sequences in a CAPP system for sheet-metal components

Abstract

An important process-planning task in sheet-metal manufacturing is the determination of bending sequences for individual components. Computer-aided generation of these sequences, as part of a computer-aided process-planning (CAPP) system, can relieve the workload of process-planning departments, this being especially important in small batch manufacturing environments. This paper discusses the functions that have to be performed during the determination of bending sequences, focusing on accuracy aspects. The generation of bending sequences is also put into the broader perspective of an integrated CAPP system such as PARTS , which is under development presently in the authors' laboratory.

Survey on model-based manipulation planning of deformable objects

“…may reject specific sequences of bending operations due to the accumulation of errors [90,91]. Optimality constraints, on the other hand, arise from ergonomic considerations, applicable to robotic manipulation as well, like the number of workpiece orientation changes [93], combined rotations [90], fixed penalties for each rotation direction [94], or combined penalties for stability and manipulability attributes [95].…”

“…Feasibility constraints include collision avoidance and tolerance specifications. The detection and handling of collisions that may arise during the bending operations ( Figure 6) is surveyed in [7], and includes sweep-volume collision verification [88,89], tuning of tool selection [90,91], or pruning based on grouping of operations [92]. Constraints on admissible tolerances Figure 8: With an adequate arrangement of punches and dies, all three bendings can be performed in a single step for the part depicted above, whereas for the one shown on the bottom requires an additional reorientation of the part.…”

Sheet metal bending operation planning: Using virtual node generation to improve search efficiency

“…de Vin et al 6,7] have developed a process planning system for nding a feasible operation sequence. Their system addresses the parttool collision and tolerance constraints.…”

Automated process planning for sheet metal bending operations

“…Finding an Optimal Operation Sequence for Bending: De Vin et al 11,12] have developed a process planning system for nding a feasible operation sequence. Their system addresses the part-tool collision and tolerance constraints.…”