海洋平臺樁腿齒條精密氧氣切割工藝研究
發(fā)布時間：2018-10-15 17:31
【摘要】：樁腿齒條是自升式鉆井平臺升降系統(tǒng)的核心零部件，承載著平臺的全部重量和載荷，是整個海洋平臺的最主要的支撐部件，其制造精度要求高、難度大、是自升式鉆井平臺建造的關鍵零部件之一。 樁腿齒條的成形加工，在國外均采用數(shù)控精密火焰切割工藝完成，一次成形達到設計要求，不再進行機械加工。目前，國際上各大公司對樁腿齒條的加工成形工藝方法都采取嚴格的保密措施，我國對樁腿齒條的需求主要依靠進口，供貨周期長、價格昂貴。因此，對國際主流型號的海洋平臺樁腿齒條的精密氧氣切割工藝的研究，形成自主知識產(chǎn)權的專用技術，并實現(xiàn)產(chǎn)業(yè)化，對提高提高我國在國際海洋平臺建造市場的競爭能力，進一步發(fā)展我國海洋油氣資源勘探開發(fā)，緩解日益嚴峻的能源安全問題，具有實際意義。 本課題針對CJ46、JU2000兩種國際主流型號的海洋平臺樁腿齒條，采用雙割炬同步對稱切割工藝，進行了1：1試驗件的精密氧氣切割試驗。試驗結果表明，切割成形的樁腿齒條試驗件符合國際設計公司的生產(chǎn)制造標準，其質(zhì)量與國際產(chǎn)品一致，同時制定的切割工藝與配套的工裝設備滿足海洋平臺樁腿齒條的生產(chǎn)制造要求，為海洋平臺樁腿齒條的自主生產(chǎn)奠定了試驗基礎。 利用流場模擬軟件FLUENT進行割嘴流場的CFD數(shù)值模擬初步研究，成功實現(xiàn)了預熱火焰流場+切割氧射流流場的數(shù)值模擬，并結合試驗分析了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特性，為割炬割嘴的設計以及切割工藝的優(yōu)化奠定了初步的理論基礎。 通過樁腿齒條切割表面質(zhì)量試驗研究切割速度對海洋平臺樁腿齒條切割表面質(zhì)量的影響。試驗研究得出，在155-165mm/min切割速度范圍內(nèi)，可以獲得符合海洋平臺樁腿齒條生產(chǎn)制造標準的切割表面質(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，無缺陷及掛渣。在此切割速度范圍內(nèi)進行海洋平臺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)化了海洋平臺樁腿齒條氧氣切割速度工藝參數(shù)。 采用金相試驗的方法，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，，研究了其對樁腿齒條使用性能的影響。試驗結果表明，在本課題氧氣切割工藝參數(shù)條件下，海洋平臺樁腿齒條工作表面硬度高，芯部韌性好、強度高，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樁腿齒條的耐磨性及使用壽命，符合齒輪齒條嚙合工作過程的設計要求。
[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.
【學位授予單位】：機械科學研究總院
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TG481;TE951
本文編號：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.
【學位授予單位】：機械科學研究總院
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TG481;TE951
【參考文獻】
相關期刊論文 前10條
1 汪張?zhí)?趙建亭;;自升式鉆井平臺在我國海洋油氣勘探開發(fā)中的應用和發(fā)展[J];船舶;2008年01期
2 吳晉湘,王恩宇,劉聯(lián)勝;大加速度場中熄火試驗的研究[J];工程熱物理學報;1999年06期
3 吳晉湘，王恩宇，劉聯(lián)勝，楊華;大加速度場對層流預混火焰影響的理論計算[J];河北工業(yè)大學學報;1999年02期
4 樊敦秋;張卿;薛世峰;仝興華;;自升式平臺齒輪齒條參數(shù)優(yōu)化研究[J];中國制造業(yè)信息化;2010年05期
5 曹宇光;張士華;李森;張卿;;自升式平臺升降系統(tǒng)齒輪失效分析[J];理化檢驗(物理分冊);2010年12期
6 馮良;王曉慶;李培華;;氧-丙烷氣割割嘴流動和燃燒的數(shù)值模擬[J];煤氣與熱力;2010年02期
7 吳晉湘,劉聯(lián)勝,王恩宇,郭雅萍;大加速度場中二維層流燃燒過程的數(shù)值模擬[J];燃燒科學與技術;2002年03期
8 張用德;袁學強;;我國海洋鉆井平臺發(fā)展現(xiàn)狀與趨勢[J];石油礦場機械;2008年09期
9 樊敦秋;崔希君;曹宇光;;自升式平臺齒輪齒條升降系統(tǒng)受力分析[J];石油礦場機械;2010年12期
10 孫永泰;自升式海洋平臺齒輪齒條升降系統(tǒng)的研究[J];石油機械;2004年10期
本文編號：2273278
本文鏈接：http://www.sikaile.net/falvlunwen/zhishichanquanfa/2273278.html
最近更新
教材專著
