海洋平台导管架建造CAD/CAM技术研究
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摘要
随着对近海油气资源开发力度的加大,近年来深水导管架建造成为海洋工程中重点发展的项目之一。随着导管架结构日益复杂,工程建造规模也逐渐庞大起来。为确保导管架工程在满足建造质量的前提下,在项目周期内顺利完工,有必要对海洋工程现有的设计制造工艺进行技术提升,以提高生产作业效率。本课题通过对海洋平台导管架的生产建造工艺进行分析,从管件切割图纸设计以及生产加工入手,开发管件切割设计系统和切管机数控系统,实现从设计到制造整个生产流程的技术提升。
     以AutoCAD为系统设计平台,以导管架单线图为结构设计基础,开发管件切割设计系统。系统自动判断管节点类型并计算各种管节点设计参数,然后进行相贯线焊接坡口计算,依据所得数据绘制管件切割成型的单件图、样板图。同时为满足后续焊接工艺要求,系统通过绘制脚印图,确定焊接管件之间的相对位置关系,满足焊接装配的精度要求。在实现相贯线计算的基础上,进一步扩展系统功能,实现重心、重量计算以及焊材统计。系统具有良好的操作性,可以有效提升导管架平台生产设计效率。
     为满足管件自动化切割的生产需求,基于对切管机割炬运动控制分析以及对管件火焰切割工艺的理解,开发切管机数控系统。在数控系统中输入管件几何、位置参数以及相关系统参数后,数控系统自动完成计算,并生成数控加工代码。同时为实现数控代码的验证,在系统中绘制管件切割成型图,并通过仿真技术,实现管件切割状态下的割炬位姿运动仿真。
     两系统紧密配合实现系统功能,促使管件切割生产从设计到加工的整个制管工艺流程向自动化、集成化方向转变。课题工作与导管架工程实际生产需要紧密结合,研究成果直接应用在导管架管件生产加工中。实际应用表明,系统功能的运用可以有效提高管件切割精度与加工效率,在保证导管架建造质量的基础之上,促进了海洋工程建造技术水平的提升。
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.
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