海洋平台桩腿齿条精密氧气切割工艺研究
发布时间：2018-10-15 17:31
【摘要】：桩腿齿条是自升式钻井平台升降系统的核心零部件，承载着平台的全部重量和载荷，是整个海洋平台的最主要的支撑部件，其制造精度要求高、难度大、是自升式钻井平台建造的关键零部件之一。 桩腿齿条的成形加工，在国外均采用数控精密火焰切割工艺完成，一次成形达到设计要求，不再进行机械加工。目前，国际上各大公司对桩腿齿条的加工成形工艺方法都采取严格的保密措施，我国对桩腿齿条的需求主要依靠进口，供货周期长、价格昂贵。因此，对国际主流型号的海洋平台桩腿齿条的精密氧气切割工艺的研究，形成自主知识产权的专用技术，并实现产业化，对提高提高我国在国际海洋平台建造市场的竞争能力，进一步发展我国海洋油气资源勘探开发，缓解日益严峻的能源安全问题，具有实际意义。 本课题针对CJ46、JU2000两种国际主流型号的海洋平台桩腿齿条，采用双割炬同步对称切割工艺，进行了1：1试验件的精密氧气切割试验。试验结果表明，切割成形的桩腿齿条试验件符合国际设计公司的生产制造标准，其质量与国际产品一致，同时制定的切割工艺与配套的工装设备满足海洋平台桩腿齿条的生产制造要求，为海洋平台桩腿齿条的自主生产奠定了试验基础。 利用流场模拟软件FLUENT进行割嘴流场的CFD数值模拟初步研究，成功实现了预热火焰流场+切割氧射流流场的数值模拟，并结合试验分析了301-4型内混式等压割嘴、EPOCH-Z200型外混式快速割嘴两种割嘴流场特性，为割炬割嘴的设计以及切割工艺的优化奠定了初步的理论基础。 通过桩腿齿条切割表面质量试验研究切割速度对海洋平台桩腿齿条切割表面质量的影响。试验研究得出，在155-165mm/min切割速度范围内，可以获得符合海洋平台桩腿齿条生产制造标准的切割表面质量，其中在160mm/min切割速度条件下，割缝宽度5mm，切割平面度1.3mm，割纹深度0.25mm，后拖量0.05mm，上沿熔化度0.5mm，无缺陷及挂渣。在此切割速度范围内进行海洋平台桩腿齿条的精密切割可较大程度提高其切割表面质量，优化了海洋平台桩腿齿条氧气切割速度工艺参数。 采用金相试验的方法，分析了桩腿齿条不同部位切割断面热影响区的组织、性能，，研究了其对桩腿齿条使用性能的影响。试验结果表明，在本课题氧气切割工艺参数条件下，海洋平台桩腿齿条工作表面硬度高，芯部韧性好、强度高，整体综合性能良好，切割断面热影响区组织有助于提高海洋平台桩腿齿条的耐磨性及使用寿命，符合齿轮齿条啮合工作过程的设计要求。
[Abstract]:The pile-leg rack is the core part of the lifting system of the jack-up drilling platform. It bears all the weight and load of the platform and is the most important supporting part of the whole offshore platform. It is one of the key parts in the construction of jack-up drilling platform. Numerical control precision flame cutting technology is used in the forming process of the rack of pile and leg in foreign countries. The forming process meets the design requirements once and no longer mechanical machining is carried out. At present, all the major companies in the world take strict secrecy measures on the processing and forming process of the post leg rack. The demand for the post leg rack in our country mainly depends on imports, the supply period is long, and the price is expensive. Therefore, the research on the precision oxygen cutting technology of the international mainstream offshore platform post leg rack, to form the special technology of independent intellectual property rights and to realize industrialization, will improve the competitive ability of our country in the construction market of the international offshore platform. It is of practical significance to further develop the exploration and development of offshore oil and gas resources in China and alleviate the increasingly serious energy security problems. In this paper, the precision oxygen cutting test of 1:1 test piece is carried out for two kinds of international mainstream models of CJ46,JU2000 offshore platform post leg rack by using the synchronous symmetrical cutting technology of double cutting torch. The test results show that the test piece of the center-leg rack is in accordance with the manufacturing standards of the international design company, and its quality is consistent with that of the international products. At the same time, the cutting technology and the matching equipment can meet the requirements of the production and manufacture of the post leg rack of the offshore platform, which lays the experimental foundation for the independent production of the post leg rack of the offshore platform. A preliminary study on the CFD numerical simulation of the flow field of the cut nozzle is carried out by using the flow field simulation software FLUENT, and the numerical simulation of the flow field of the oxygen jet cutting in the preheated flame field is successfully realized. The flow field characteristics of 301-4 type internal mixed cutting nozzle and EPOCH-Z200 type external mixed fast cutting nozzle are analyzed, which lays a theoretical foundation for the design of cutting torch and the optimization of cutting technology. The effect of cutting speed on the surface quality of rack cutting of pile leg on offshore platform was studied by means of the experiment of cutting surface quality of rack of pile leg. The experimental results show that in the range of 155-165mm/min cutting speed, the cutting surface quality can be obtained in accordance with the manufacturing standard of rack of pile leg of offshore platform. Among them, under the condition of 160mm/min cutting speed, the surface quality of the cutting surface can be obtained under the condition of 160mm/min cutting speed. The width of slit is 5mm, the cutting plane is 1.3mm, the depth of cutting grain is 0.25mm, the drag is 0.05mm, the melting degree of upper edge is 0.5mm, there is no defect and slagging. In the range of cutting speed, the cutting surface quality can be improved greatly by precise cutting of rack of post leg of offshore platform, and the technological parameters of oxygen cutting speed of rack of post leg of offshore platform are optimized. By means of metallographic test, the structure and performance of the heat-affected zone (HAZ) in different cutting sections of the rack of the pile leg are analyzed, and the effect on the performance of the rack of the leg of the pile is studied. The experimental results show that, under the condition of oxygen cutting process parameters, the working surface hardness, core toughness, strength and overall comprehensive performance of leg rack of offshore platform pile are high. The structure of the heat-affected zone of the cutting section is helpful to improve the wear resistance and service life of the leg rack of the offshore platform and meet the design requirements of the meshing process of the gear rack.
【学位授予单位】：机械科学研究总院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TG481;TE951
本文编号：2273278
[Abstract]:The pile-leg rack is the core part of the lifting system of the jack-up drilling platform. It bears all the weight and load of the platform and is the most important supporting part of the whole offshore platform. It is one of the key parts in the construction of jack-up drilling platform. Numerical control precision flame cutting technology is used in the forming process of the rack of pile and leg in foreign countries. The forming process meets the design requirements once and no longer mechanical machining is carried out. At present, all the major companies in the world take strict secrecy measures on the processing and forming process of the post leg rack. The demand for the post leg rack in our country mainly depends on imports, the supply period is long, and the price is expensive. Therefore, the research on the precision oxygen cutting technology of the international mainstream offshore platform post leg rack, to form the special technology of independent intellectual property rights and to realize industrialization, will improve the competitive ability of our country in the construction market of the international offshore platform. It is of practical significance to further develop the exploration and development of offshore oil and gas resources in China and alleviate the increasingly serious energy security problems. In this paper, the precision oxygen cutting test of 1:1 test piece is carried out for two kinds of international mainstream models of CJ46,JU2000 offshore platform post leg rack by using the synchronous symmetrical cutting technology of double cutting torch. The test results show that the test piece of the center-leg rack is in accordance with the manufacturing standards of the international design company, and its quality is consistent with that of the international products. At the same time, the cutting technology and the matching equipment can meet the requirements of the production and manufacture of the post leg rack of the offshore platform, which lays the experimental foundation for the independent production of the post leg rack of the offshore platform. A preliminary study on the CFD numerical simulation of the flow field of the cut nozzle is carried out by using the flow field simulation software FLUENT, and the numerical simulation of the flow field of the oxygen jet cutting in the preheated flame field is successfully realized. The flow field characteristics of 301-4 type internal mixed cutting nozzle and EPOCH-Z200 type external mixed fast cutting nozzle are analyzed, which lays a theoretical foundation for the design of cutting torch and the optimization of cutting technology. The effect of cutting speed on the surface quality of rack cutting of pile leg on offshore platform was studied by means of the experiment of cutting surface quality of rack of pile leg. The experimental results show that in the range of 155-165mm/min cutting speed, the cutting surface quality can be obtained in accordance with the manufacturing standard of rack of pile leg of offshore platform. Among them, under the condition of 160mm/min cutting speed, the surface quality of the cutting surface can be obtained under the condition of 160mm/min cutting speed. The width of slit is 5mm, the cutting plane is 1.3mm, the depth of cutting grain is 0.25mm, the drag is 0.05mm, the melting degree of upper edge is 0.5mm, there is no defect and slagging. In the range of cutting speed, the cutting surface quality can be improved greatly by precise cutting of rack of post leg of offshore platform, and the technological parameters of oxygen cutting speed of rack of post leg of offshore platform are optimized. By means of metallographic test, the structure and performance of the heat-affected zone (HAZ) in different cutting sections of the rack of the pile leg are analyzed, and the effect on the performance of the rack of the leg of the pile is studied. The experimental results show that, under the condition of oxygen cutting process parameters, the working surface hardness, core toughness, strength and overall comprehensive performance of leg rack of offshore platform pile are high. The structure of the heat-affected zone of the cutting section is helpful to improve the wear resistance and service life of the leg rack of the offshore platform and meet the design requirements of the meshing process of the gear rack.
【学位授予单位】：机械科学研究总院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TG481;TE951
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