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1

Design for manufacturability in virtual environment using knowledge engineering

Jakubowski J., Peterka J.

Management and Production Engineering Review

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2014

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Vol. 5, No. 1

3--10

EN

Design for manufacturing (DFM) strategies help companies to develop new products that are feasible to manufacture. In the early stages of design all engineering activities are initiated in computer aided systems. When the design is finished, the process of manufacturing and production planning begins. Issues often occur at this point because two teams, designers and manufacturers, have been working separately. The resulting question is: ‘how can Knowledge Engineering (KE) be used effectively to enhance manufacturability during early design?’ Even if the most complex geometrical product can be realized using today’s technologies such as rapid prototyping it is only true in unit production. In lot and mass production where CNC machines are used, complex geometry causes a number of difficulties. So it is important to investigate the project carefully in the early design stage from the point of view of whether it will be possible to manufacture.

2

A hybrid approach for manufacturability analysis

Stryczek R.

Advances in Manufacturing Science and Technology

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2011

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Vol. 35, nr 3

55-70

EN

The paper describes a practical solution for knowledge acquisition of expert process planners and/or experienced machinists with sets of heuristic rules. This fuzzy approach enables to perform manufacturability analysis. Therefore, proposed knowledge system can help in identifying of potential manufacturing problems early in design stage and in determining of machining precedence constraints (hard constraints) in situation of feature volumetric interaction. Special class Weighted Priority Petri Nets and Genetic Algorithms have been used to analyse and optimize the results. Finally, an illustrative example of hole making has been used to demonstrate the proposed methodology.

PL

W pracy przedstawiono praktyczne rozwiązanie problemu akwizycji wiedzy eksperta w projektowaniu procesów i/lub doświadczonych operatorów obrabiarek, reprezentowanej w postaci zbioru heurystycznych reguł. Rozmyte podejście pozwala na prowadzenie analizy technologiczności proponowanego rozwiązania. Opracowana metoda jest pomocna w identyfikacji potencjalnych problemów wytwórczych już na etapie projektowania konstrukcyjnego. Pozwala określić ograniczenia krytyczne dla relacji procedencji, wynikające z wzajemnych objętościowych interakcji pomiędzy formami elementarnymi występującymi w projektowanym wyrobie. Użyto specjalnych klas wagowych, priorytetowych sieci Petriego i algorytmu genetycznego dla analizy i optymalizacji wyników. Zaproponowane podejście przedstawiono na przykładzie ustalania sekwencji obróbki otworów, uwzględniającej technologiczność rozwiązania.

3

Vertical versus horizontal approach to product development in virtual computer integrated engineering systems

Jakubowski J.

Management and Production Engineering Review

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2010

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Vol. 1, No. 4

100-107

EN

Due to increasing competition in the manufacturing industry, the search for shorter product development and production cycles and lower cost led to the emergence of design and manufacturing integration processes. An advanced integrated design environment, such as Catia system enables the engineers to evaluate multiple constraints from manufacturing, assembly, service at the design stage. The paper considers one of the most important aspects of recent product developments called virtual development. In that process the main role is played by Digital Mock-Up which could be considered as a horizontal build up model as well as a traditional vertical approach. Application of virtual manufacturing presented in this paper was prepared in one integrated CAx environment.