CAD/CAPP/CAM Integrated System Development For Key Components In Marine Diesel

As the power equipment of the ship, marine diesel, which acts as the'heart'of the ship, is the indispensable equipment in ship.However, the manufacturing of marine diesel has been lagging behind the whole shipbuilding process, and has became the bottle-neck of our country's even world's shipbuilding field in a long time. Although many companies have accordingly imported CAD/CAPP/CAM technology, which lack mutual co-ordination and mutual support. information are transferred by hand,and the formats of data are not unified, which are limited limited access to each other. that is not only a large waste of money and human resource, but also in low efficient, needing much of repeated working and making mistake easily.which has obviously prevented the development of marine diesel parts manufacturing.Based on the analysis on the CAD/CAPP/CAM integrated system problems in the manufacturing process of marine diesel key components , this paper aims at solving the practical problems in enterprise by using the research results of feature technology and knowledge-based engineering. The innovation of this paper is to explore the application of feature technology and combined with KBE in CAD/CAPP/CAM integrated system ,and establish a CAD/CAPP/CAM integrated system which is appropriate for marine diesel key components. This system not only improves respective shortcoming of traditional CAD/CAPP/CAM system ,but also simplifies digital manufacturing work of marine diesel key components,which makes digital manufacturing level rise to a new step.Its main content and productions are as follows:(1) Analyzing the enterprise practical situation, the study has constructed the CAD/CAPP/CAM integrated system platform. This system realizes series of operations such as feature information extraction,feature reconsitution, feature process inference,manufacturing operation creation, feature tool path, NC machining simulation, NC code generation,postprocessor customization,enterprise manufacture information management,and so on. And cases of CNC manufacturing for key components of marine diesel have been illustrated to validate the effectiveness of the system.(2) CAD/CAPP/CAM integrated method and technology: Not only research the integrating method & integrating technology of CAD/CAPP/CAM on the UG platform,but also the construction technology of generalized knowledge base, which realizes the up information and the down information flow to each other, share the information together, in order to improve the efficiency and the quality of digital manufacturing. (3) Aiming at the different models of the marine diesel key components, summarize the similar machining feature, Similar processing technic and tool path. Construct new machining template by means of split and recombine existing machining template, in order to meet the different models machining needs and furthest reduce repeatability in the process of digital integrated manufacture.(4) In order to make CAD/CAPP/CAM integrated system driven by knowledge, aimed at the characteristics of CAD/CAPP/CAM integration field knowledge, the application of knowledge-based technology in CAD/CAPP/CAM integration is studied, including knowledge representation in the field of CAD/CAPP/CAM integration, knowledge acquisition and knowledge reasoning. It can promote CAD/CAPP/CAM integrated system intelligentize with the support of knowledge-based technology.(5) Aiming at the feature of the marine diesel key components and the company's facility, basing on the feature, customize and optimize the tool path of the marine diesel key components. Taking key components of marine diesel as objects, it has a research on classification of manufacturing feature, summary of company frequently-used tool path form, mapping technology& information processing of manufacturing feature processing, and tool path planning&optimization based on manufacturing feature,in order to make tool path meet the company's requirement.