Feature-based generation of machining process plans for optimised parts manufacture

Abstract

Efficacious integration of such CAx technologies as CAD, CAM and CAPP still remains a problem in engineering practice which constantly attracts research attention. Design by feature model is assumed as a main factor in the integration effort in various engineering and manufacturing domains. It refers principally to feature clustering and consequently operation sequencing in elaborated process plan designs. The focus of this paper is on CAPP for parts manufacture in systems of definite processing capabilities, involving multi-axis machining centres. A methodical approach is proposed to optimally solve for process planning problems, which consists in the identification of process alternatives and sequencing adequate working steps. The approach involves the use of the branch and bound concept from the field of artificial intelligence. A conceptual scheme for generation of alternative process plans in the form of a network is developed. It is based on part design data modelling in terms of machining features. A relevant algorithm is proposed for creating such a network and searching for the optimal process plan solution from the viewpoint of its operational performance, under formulated process constraints. The feasibility of the approach and the algorithm are illustrated by a numerical case with regard to a real application and diverse machine tools with relevant tooling. Generated process alternatives for complex machining with given systems, are studied using models programmed in the environment of Matlab software.

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“…Nabiera to szczególnego znaczenia w aspekcie dążeń do podwyższenia stopnia automatyzacji procedur doboru strategii realizacji procesu obróbki [2,9]. LITERATURA …”

“…Alternative sequences were modelled as weighted acyclic graphs for generated variants of subsequent toolpaths and evaluated in terms of cost. KEYWORDS: CAPP, features, tool sequences, graph modelling Dobór sekwencji narzędziowej dla pojedynczego TOE Celem badań jest wyznaczenie optymalnej sekwencji narzędziowej dla wielozabiegowej obróbki frezowaniem zespołu powierzchni złożonych kieszeni, a realizowanej w zakresie pojedynczego ustawienia przedmiotu [2,6]. W procesie obróbki kieszeni 2.5D jako technologicznych obiektów elementarnych (TOE) F = {f 1 , f 2 , … , f m } założono użycie narzędzi ze zbioru T = {t 1 , t 2 , … , t n } o średnicach d 1 >d 2 > …d n , uwzględniając ograniczenia kolejności zabiegów wynikające z zagnieżdżania cech TOE [1,5].…”