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ndlaser machine. The method can also be easily automated and integrated with the nesting and Gcode generation processes. Some issues and possible future research topics have also been discussed. Keywords: Combination machine。 Combined punchandlaser machine。 Sheet metal。 Process planning。 Optimization。 Ant colony optimization 1. Introduction Modern puter numeric controlled (CNC) turret punches represent highly versatile machine tools capable of producing sheet metal and plastic ponents quickly and accurately. However, the versatility of such turret punches is limited in that material can be removed from the work piece only by a punching type operation. When large areas of the work piece are to be removed, or when the work piece is to be subdivided into a number of separable work pieces, or when relatively long or large diameter parts are to be made, this can be acplished only by a series of slightly overlapping punching type metal removal operations. Such overlapping material removal operations can be effectively used to increase the versatility of a punch, however, those operations, at times, lead to undesired consequences, such as formation of burred edges, inability to produce highly accurate, smooth side edges, relative slowness of operation, etc. (Clark and Carbone 1980). Moreover, when the cutout shape is not one of the mon punch tool shapes, special tools have to be made and the costs of making such tools are normally high. As a result, many cutting or shearing type operations are performed by other machine tools in a subsequent operation that requires additional work piece handling. This multimachinery requirement influences not only the manufacturing efficiency, but also the manufacturing quality and cost. The above stated reasons motivated the development of a socalled bined punchandlaser cutting machine (Clark and Carbone 1980), or pound machine (Katayama 1989a, b, Xie et al. 2021), or bination punch press and laser cutting machine (Klingel and Doettling 1990, Ulrish 2021). In this work, this machine will be referred as bined punchandlaser machine. The bined punchandlaser machine was first invented in 1980 (Clark and Carbone 1980), and then gradually matured by overing its vibration interference problem through a number of patents (Bredow 1982, Katayama 1989a, b, Klingel and Doettling 1990, Ulrish 2021). With variations on detailed machine stru