Papers by Keyword: 3D Process Planning

Abstract: In the model-based definition (MBD) scheme, activities of process planning need to be carried out in 3D environment. To realize the 3D computer-aided process planning (3D CAPP), the design solid model needs to be transferred into a representation as manufacturing features, features’ process requirement and product manufacturing information (PMI), and then the generative process planning techniques can be realized by inferring machining operations based machining feature knowledge base. A machining feature-based 3D computer-aided process planning approach is proposed for machining part. Design model is transferred into boundary representation (B-Rep). According to a machining features classification scheme, hybrid machining feature recognition technique is introduced. A part process information model is generated including machining features, feature relationship, feature’s process chain. For each recognized machining feature, a feature’s process chain is inferred from feature knowledge base, based on feature type, process requirements, dimension and tolerances, and the enterprise manufacturing resources. Process intermediate models corresponding to each process operation are generated automatically by applying geometry local modification operations. The complete process plan is generated and documented with detailed operation information and 3D process intermediate models. A 3D CAPP tool is developed on ACIS/HOOPS, with industrial cases to demonstrate the feasibility and applicability of proposed method.

Abstract: The 3D assembly process planning and simulation system can improve the product manufacturing level in airplane manufacturing enterprises, but now there is few system of this kind. So we design a system named Digital Virtual Airplane Assembly Process Planning and Simulation System (DVA²P²S²) to improve the situation. Firstly, we design the system’s structure with data support, systems integration and functions development and user application as its three levels. Secondly, its running flow is introduced. Thirdly, two key technologies which are 3D digital assembly process structure and the method of automatic creation of simulation file are discussed. At last, we set a subassembly of an airplane to validate the DVA²P²S². The result shows that the DVA²P²S² is in accordance with the Concurrent Engineering’s requirements, and it can improve the work efficiency and reduce the process design iteration and cycle significantly.

Abstract: Computer Aided Assembly Process Planning and Simulation in 3D environment depends mainly on the manner of human-computer interaction currently in the airplane manufacturing industry, and in fact it’s just a recorder for recording the designers’ assembly intention. It’s short of supports for a designer to execute the 3D assembly process planning and simulation, for lacking a strict process flow definition and a pilot method. In this respect, we propose a decomposition modeling method of 3D assembly process planning and simulation for airplane subassembly named Assembly Process Micro-Planning and Simulation (APMPS), which defines a standardization flow and a data-information modeling method. By using this method, the assembly process can be designed and validated form assembly-design-intention to assembly-process-planning to assembly-process-simulation with the five process levels’ definition (AJATAOAAAM). This method is validated by a central-wing’s assembly process design in an airplane manufactory. The result shows that the APMPSS is in accordance with the Concurrent Engineering’s requirements, and it can be carried out fast in 3D environment.