本文選題：鋁合金鉆桿 + 擠壓成形��； 參考：《西南石油大學(xué)》2017年碩士論文

【摘要】：隨著油氣勘探技術(shù)的發(fā)展與進步,國內(nèi)外油氣開采的發(fā)展方向逐步轉(zhuǎn)向深井/超深井、大位移井及含硫化氫和二氧化碳的油氣井。在這些油氣井的勘探與開采中,鋁合金鉆桿憑借良好的力學(xué)性能、耐腐蝕性能而在世界范圍受到廣泛關(guān)注并得到推廣應(yīng)用。但相較俄羅斯、美國等鋁合金鉆桿主要生產(chǎn)國,我國鋁合金鉆桿的生產(chǎn)尚處于試制階段,且在管體成形工藝及質(zhì)量上存在諸多待攻關(guān)問題。因此,開展鋁合金鉆桿成形工藝、質(zhì)量及材料設(shè)計等方面的研究,對于指導(dǎo)我國鋁合金鉆桿成形工藝優(yōu)化,加快我國鋁合金鉆桿研制及批量化生產(chǎn)進度有著重要的意義。本文采用Deform-3D數(shù)值模擬軟件,分別模擬7075鋁合金及15%volSiCp/7075復(fù)合材料Φ73 mm雙端內(nèi)加厚鉆桿的一次擠壓成形過程,從成形過程中坯料的應(yīng)力云圖、管體的等效應(yīng)變分布及成形后管體內(nèi)、外表面的損傷、動態(tài)再結(jié)晶及幾何尺寸偏差方面分析工模具幾何形貌及擠壓工藝對管體成形及質(zhì)量的影響,得到兩種材料的Φ73 mm雙端內(nèi)加厚鉆桿管體擠壓成形的優(yōu)化工藝;其后,通過對比分析兩種材料在優(yōu)化擠壓工藝下的管體成形質(zhì)量,重點探討采用7075鋁合金與15%volSiCp/7075復(fù)合材料擠壓成形的Φ73 mm雙端內(nèi)加厚鉆桿在管體外表面損傷因子、動態(tài)再結(jié)晶及幾何尺寸偏差等方面的差異,對比各成形工藝要素對管體成形質(zhì)量的影響程度;再次,采用臥式擠壓機分別擠壓成形Φ73 mm鉆桿的內(nèi)加厚段及主體段,通過觀察兩段管體的金相組織,驗證數(shù)值模擬中擠壓鉆桿動態(tài)再結(jié)晶分布規(guī)律;最后,采用Deform-3D軟件模擬單顆粒的6.5%SiCp/7075復(fù)合材料的壓縮變形過程,從壓縮變形過程中基體、界面、顆粒的應(yīng)力、溫度及基體的應(yīng)變、損傷上探討界面層材料及顆粒形貌對微單元壓縮變形行為的影響。模擬及實驗研究表明,采用空心坯料一次擠壓成形的Φ73 mm雙端內(nèi)加厚7075鋁合金鉆桿管體上,管體后端外表面存在損傷因子高、外表面動態(tài)再結(jié)晶百分數(shù)及動態(tài)再結(jié)晶晶粒平均尺寸軸向差距大,且外徑、壁厚偏差嚴重等問題。當鉆桿材料為7075鋁合金時,Φ73 mm雙端內(nèi)加厚鉆桿的優(yōu)化工模具形貌是平錐模的模角為63°、穿孔針錐形段長度為12.5 mm,優(yōu)化擠壓工藝參數(shù)是擠壓比為25、擠壓溫度為400℃、擠壓速度為1.12 mm/s;當鉆桿材料為15%volSiCp/7075復(fù)合材料時,Φ73 mm雙端內(nèi)加厚鉆桿的優(yōu)化工模具形貌是平錐模的模角為60 °,穿孔針錐形段長度為12.5 mm,優(yōu)化擠壓工藝是擠壓比為25、擠壓溫度為380℃、擠壓速度為1.52mm/s。對于6.5%volSiCp/7075復(fù)合材料的壓縮變形,當采用Si02作為界面材料且顆粒形貌為球體時,基體的損傷因子相對最小。
[Abstract]:With the development and progress of oil and gas exploration technology, the development direction of oil and gas production at home and abroad has gradually shifted to deep well / ultra deep well, long reach well and oil and gas well containing hydrogen sulfide and carbon dioxide. In the exploration and exploitation of these oil and gas wells, aluminum alloy drill pipes are widely concerned and widely used in the world because of their good mechanical properties and corrosion resistance. However, compared with Russia and the United States, the production of aluminum alloy drill pipe in China is still in the stage of trial production, and there are many problems to be solved in the forming process and quality of the pipe body. Therefore, the research on forming process, quality and material design of aluminum alloy drill pipe is of great significance in guiding the optimization of aluminum alloy drill pipe forming process in China and speeding up the development and batch production of aluminum alloy drill pipe in China. In this paper, Deform-3D numerical simulation software is used to simulate the forming process of 7075 aluminum alloy and 桅 73 mm 桅 73 mm double end thickened drill pipe respectively. The stress cloud diagram of the billet, the equivalent strain distribution of the tube and the body of the tube after forming are obtained from the stress cloud diagram of the billet during the forming process. The effects of die geometry and extrusion technology on tube forming and quality were analyzed from the aspects of external surface damage, dynamic recrystallization and geometric dimension deviation. The optimized forming process of 桅 73 mm double end thickened drill pipe tube with two kinds of materials was obtained. Then, by comparing and analyzing the tube forming quality of two kinds of materials under the optimized extrusion process, the damage factors of 桅 73mm double-end inner thickened drill pipe formed by extruding 7075 aluminum alloy and 15%volSiCp/7075 composite material outside the tube are discussed emphatically. The differences of dynamic recrystallization and geometric dimension deviation are compared to compare the influence of various forming process factors on the forming quality of pipe. Thirdly, the inner thickening section and main section of 桅 73 mm drill pipe are extruded by horizontal extruder respectively. The dynamic recrystallization distribution of extruded drill pipe in numerical simulation is verified by observing the metallographic structure of two-stage tube. Finally, the compression deformation process of 6.5%SiCp/7075 composite material with single particle is simulated by Deform-3D software, and the matrix and interface are simulated during compression deformation. The effects of interfacial layer materials and particle morphology on the compressive deformation behavior of microelements were investigated on the basis of stress, temperature, matrix strain and damage. The simulation and experimental study show that the outer surface of the 7075 aluminum alloy drill pipe with 桅 73 mm double end thickening has high damage factor on the outer surface of the tube, which is formed by single extrusion of hollow billet. The dynamic recrystallization percentage of the outer surface and the average grain size of the dynamic recrystallization have a large axial gap, and the external diameter and wall thickness deviation are serious. When the drilling pipe material is 7075 aluminum alloy, the optimum die shape of 桅 73 mm double end internal thickening drill pipe is 63 擄for flat cone die, 12.5 mm for the length of tapered section of perforated needle, and 25 for extrusion ratio and 400 鈩，

本文編號：1806317