Automatic determination of bending sequences for sheet metal parts with parallel bends

Abstract

A method for solving the problem of bend sequencing in sheet metal manufacturing is presented. The algorithm developed divides the part into basic shapes (channels and spirals) and determines the partial sequences associated with them. The complete bending sequences associated with the complete part were obtained from the combination of these partial sequences. To make this combination possible, several strategies were defined to reduce the number of solutions and, therefore, the searching time. All sequences (partial and complete) were checked considering possible part-tool collisions and tolerance constraints. The last stage was to order the sequences by taking into account the total process time. To attain the required process time accuracy, a robot was used for the handling operations. Finally, the sequence associated with the lower process time was selected as the optimal solution.

Tolerance transfer in sheet metal forming

“…Gupta and Rajagopal (2002) discuss more issues such as multi-part setup planning, and tool and fixture design for bending. Rico et al (2003) present a method for solving the problem of bend sequencing in sheet metal manufacturing. The algorithm divides the part into basic shapes, i.e.…”

“…Aomura and Koguchi (2002) use a simple accumulation of size tolerances for sheet metal bending. Shpitalni and Radin (1999) and Rico et al (2003) consider the propagation of size tolerances and the effects of tolerance constraints on sequences based on the method.…”

The Methods Used in the Automotive Production: Hemming Operations Planning

“…These levels of investment, process time, as the technical requirements can be distinguished according to various factors. [6][7][8] This study will examine the main stages of a suitable robotic roller hemming process as claimed in one of the production capacity on an annual basis. Process inputs used in the process of development is predictive.…”

An Expert System Framework for Design of Bending Die

“…Kim et al [9] proposed an automated design system for process planning and die design by using fuzzy set theory for an electric product with intricate piercing and bending operations. A method for solving the problem of bend sequencing in sheet metal manufacturing was presented by Rico et al [10]. In order to reduce the calculation time to identify valid sequences, a method based on the part division in basic shapes (channels and spirals) was proposed.…”