Approach To CAD/CAM System On The Construction Of Offshore Jacket

With the growing exploitation of offshore oil and gas resources, the construction of deep water jacket has become a key project in ocean engineering in recent years. Jacket structure is increasingly complicated. As a result, project scale is growing too. Under the premise of guaranteeing construction quality, in order to ensure completion of construction project in construction cycle, it is necessary to transform the current technology of production design, improve production efficiency and realize the technology level of ascension. Through systemic analysis of the technological process on the construction of offshore jacket, this paper started with pipe cutting design and production processing, developed Pipe Cutting Design System and CNC Pipe Cutting System, which realized comprehensive technology promotion of the whole production flow.Based on offshore jacket single line diagram, the Pipe Cutting Design System was developed under the AutoCAD design platform. The system automatically implements the judgment of pipe joints type, calculation of node design parameters, then realizes calculation of intersecting curves with welding groove of many types of intersecting joints. On the basis of the computational data, system automatically generates pipe cutting sheet and template sheet. Meanwhile, in order to meet welding process requirements, footprint drawings are designed to determine the mutual position of welding pipes and meet the precision requirements of the welding assembly design. On the basis of calculation of intersecting curves, system function is further extended, which implements calculation of center of gravity and weight, statistics of welding materials. The system has good operability and is helpful to improve the manufacturing and design efficiency of offshore jacket platform.To realize the production requirements of pipe automatic cutting processing, on the basis of mechanical structure motion analysis of Pipe Cutting Machine and flame cutting process, CNC Flame Pipe Cutting System was developed. After inputting of calculating parameters including pipes geometric parameters, location parameters and system parameters, system automatically calculates and generates NC code. Meanwhile in order to check NC code, cutting molding figure is drew in the system. Through simulation technology, pipe cutting process simulation is realized. Cooperating together tightly, system function is implemented, which promotes the whole pipe cutting process from design to manufacture developing into automation and integration. The research is closely related with the production demand of ocean engineering, and research result is applied directly in jacket pipes production. The practical application showed that system functions implementation effectively improves the pipe processing precision and efficiency, which promotes the ascension of construction technology level on the basis of guarantee construction quality of offshore jacket.