海洋平臺(tái)樁腿齒條精密氧氣切割工藝研究
發(fā)布時(shí)間：2018-10-15 17:31
【摘要】：樁腿齒條是自升式鉆井平臺(tái)升降系統(tǒng)的核心零部件，承載著平臺(tái)的全部重量和載荷，是整個(gè)海洋平臺(tái)的最主要的支撐部件，其制造精度要求高、難度大、是自升式鉆井平臺(tái)建造的關(guān)鍵零部件之一。 樁腿齒條的成形加工，在國(guó)外均采用數(shù)控精密火焰切割工藝完成，一次成形達(dá)到設(shè)計(jì)要求，不再進(jìn)行機(jī)械加工。目前，國(guó)際上各大公司對(duì)樁腿齒條的加工成形工藝方法都采取嚴(yán)格的保密措施，我國(guó)對(duì)樁腿齒條的需求主要依靠進(jìn)口，供貨周期長(zhǎng)、價(jià)格昂貴。因此，對(duì)國(guó)際主流型號(hào)的海洋平臺(tái)樁腿齒條的精密氧氣切割工藝的研究，形成自主知識(shí)產(chǎn)權(quán)的專用技術(shù)，并實(shí)現(xiàn)產(chǎn)業(yè)化，對(duì)提高提高我國(guó)在國(guó)際海洋平臺(tái)建造市場(chǎng)的競(jìng)爭(zhēng)能力，進(jìn)一步發(fā)展我國(guó)海洋油氣資源勘探開(kāi)發(fā)，緩解日益嚴(yán)峻的能源安全問(wèn)題，具有實(shí)際意義。 本課題針對(duì)CJ46、JU2000兩種國(guó)際主流型號(hào)的海洋平臺(tái)樁腿齒條，采用雙割炬同步對(duì)稱切割工藝，進(jìn)行了1：1試驗(yàn)件的精密氧氣切割試驗(yàn)。試驗(yàn)結(jié)果表明，切割成形的樁腿齒條試驗(yàn)件符合國(guó)際設(shè)計(jì)公司的生產(chǎn)制造標(biāo)準(zhǔn)，其質(zhì)量與國(guó)際產(chǎn)品一致，同時(shí)制定的切割工藝與配套的工裝設(shè)備滿足海洋平臺(tái)樁腿齒條的生產(chǎn)制造要求，為海洋平臺(tái)樁腿齒條的自主生產(chǎn)奠定了試驗(yàn)基礎(chǔ)。 利用流場(chǎng)模擬軟件FLUENT進(jìn)行割嘴流場(chǎng)的CFD數(shù)值模擬初步研究，成功實(shí)現(xiàn)了預(yù)熱火焰流場(chǎng)+切割氧射流流場(chǎng)的數(shù)值模擬，并結(jié)合試驗(yàn)分析了301-4型內(nèi)混式等壓割嘴、EPOCH-Z200型外混式快速割嘴兩種割嘴流場(chǎng)特性，為割炬割嘴的設(shè)計(jì)以及切割工藝的優(yōu)化奠定了初步的理論基礎(chǔ)。 通過(guò)樁腿齒條切割表面質(zhì)量試驗(yàn)研究切割速度對(duì)海洋平臺(tái)樁腿齒條切割表面質(zhì)量的影響。試驗(yàn)研究得出，在155-165mm/min切割速度范圍內(nèi)，可以獲得符合海洋平臺(tái)樁腿齒條生產(chǎn)制造標(biāo)準(zhǔn)的切割表面質(zhì)量，其中在160mm/min切割速度條件下，割縫寬度5mm，切割平面度1.3mm，割紋深度0.25mm，后拖量0.05mm，上沿熔化度0.5mm，無(wú)缺陷及掛渣。在此切割速度范圍內(nèi)進(jìn)行海洋平臺(tái)樁腿齒條的精密切割可較大程度提高其切割表面質(zhì)量，優(yōu)化了海洋平臺(tái)樁腿齒條氧氣切割速度工藝參數(shù)。 采用金相試驗(yàn)的方法，分析了樁腿齒條不同部位切割斷面熱影響區(qū)的組織、性能，，研究了其對(duì)樁腿齒條使用性能的影響。試驗(yàn)結(jié)果表明，在本課題氧氣切割工藝參數(shù)條件下，海洋平臺(tái)樁腿齒條工作表面硬度高，芯部韌性好、強(qiáng)度高，整體綜合性能良好，切割斷面熱影響區(qū)組織有助于提高海洋平臺(tái)樁腿齒條的耐磨性及使用壽命，符合齒輪齒條嚙合工作過(guò)程的設(shè)計(jì)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.
【學(xué)位授予單位】：機(jī)械科學(xué)研究總院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TG481;TE951
本文編號(hào)：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.
【學(xué)位授予單位】：機(jī)械科學(xué)研究總院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TG481;TE951
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