Research On Product Process Assignment System And Key Technologies For Project

Production process preparation is the important link between product design and product manufacture. It is important to improve the management level of the process preparation and sound arrange tasks of process preparation for reducing the production cycle of products and improving enterprises' competitive power. Now, most research focus on computer aided serial and integration technology. However, the study on product process tasks management is relative fewer, and it has been a bottleneck problem for process management. To the question, the solution of building product process assignment system is presented. Product process assignment is a process and method of dividing and assigning production tasks in the cycle life of production process. The intension of process assignment is addressed in various ways. To fulfill the requirement of project "The system of production technology preparation and process management" and solve some shortage on tasks and information management, the systematic technology framework of product process assignment is built, and these technologies about product process assignment modeling, planning and BOM description are studied. The research works done show as bellow:Based on analyzing business process and intension, a system framework of aero product process assignment is set up for product development process. The framework meets the requirements of integration with CAD and CAPP. And the system can implement rapidly dividing and assigning process tasks.Study the modeling technology of product process assignment process. A modeling method based on mapping division is presented. Some shortcomings of current modeling method are overcome with the method. Based on the method, a process model of process assignment is established. And information and resource model has been built to support the process model. These results validate the feasibility of the process modeling method. Therefore, the research lays the theoretical foundation for intelligent decision-making of process assignment and information integration of other systems. Study the planning method of process assignment. For it is difficult to intelligent programming of tasks, process work breakdown method based on rules and relationship matrix is proposed. The approach can rapidly divide the process task based on PWBS (Production Work Breakdown Structure), with process file type demand as the kernel. Grouping decision-making model of process tasks is established. Estimating model for process workload and task executor capability (Task Execute Cell) is proposed in steps. Lastly, application of GA (Genetic Algorithm) is discussed on the process of process assignment.It is a key issue of integrating the process assignment system with PDM (Product data Manage), CAD and CAPP to describe BOM. To the issue, a novel approach to represent generic bill of material (GBOM) is proposed based on XML and binary encoding. This approach organizes and manages data of process assignment through GBOM, and represents GBOM with neutral language of data exchange XML. The method fulfils requirements of information integration and solves the problem of data consistency.Lastly,Based on above-mentioned research, with Microsoft C#.Net program language, an integrated product process assignment prototype system on PDM is developed to validate the feasibility of these researches, in Microsoft SQL Server 2005 relationship database development environment.