本文關(guān)鍵詞： 06Cr18Ni11Ti不銹鋼 窄深槽 緩進(jìn)磨削 本構(gòu)模型 表面粗糙度　出處：《太原理工大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：窄深槽是指槽的深寬比大于2,且槽寬小于4mm的一種特殊結(jié)構(gòu),常出現(xiàn)在航空、汽車等領(lǐng)域的重要零部件上。變量泵的轉(zhuǎn)子圓周上一般會(huì)均布10~12個(gè)徑向的高精度直槽,這類槽便是典型的窄深槽。高精度的窄深槽的加工是機(jī)械領(lǐng)域中的難題。當(dāng)變量泵輸送具有酸腐蝕性的物料時(shí),要求轉(zhuǎn)子本身具有耐腐蝕性。06Cr18Ni11Ti不銹鋼不僅強(qiáng)度高而且韌性好,具有較強(qiáng)的抗晶間腐蝕能力及良好的冷熱加工性能和焊接性,將其選為轉(zhuǎn)子材料并在其上進(jìn)行窄深槽的加工研究具有一定的理論意義和實(shí)用價(jià)值。論文從研究06Cr18Ni11Ti的動(dòng)態(tài)力學(xué)性能入手,進(jìn)行了材料常溫下的準(zhǔn)靜態(tài)單軸壓縮實(shí)驗(yàn)、常溫和高溫下的分離式霍普金森壓桿實(shí)驗(yàn),獲得了材料的真應(yīng)力-真應(yīng)變曲線,建立了材料的本構(gòu)模型;利用有限元分析軟件ABAQUS對(duì)06Cr18Ni11Ti進(jìn)行了單顆磨粒平面磨削加工仿真;使用單層電鍍CBN砂輪,通過大橋MV-40型立式加工中心進(jìn)行了06Cr18Ni11Ti不銹鋼窄深槽的緩進(jìn)磨削加工試驗(yàn)研究。研究工作得到國家自然科學(xué)基金項(xiàng)目(51575375)的資助。論文的主要內(nèi)容如下:(1)研究了不銹鋼及其加工技術(shù)現(xiàn)狀;進(jìn)行了窄深槽的加工技術(shù)現(xiàn)狀分析,詳細(xì)闡述了窄深槽的緩進(jìn)磨削加工技術(shù)及其應(yīng)用。(2)進(jìn)行了準(zhǔn)靜態(tài)單軸壓縮實(shí)驗(yàn)和常溫、高溫下的分離式霍普金森壓桿實(shí)驗(yàn);研究了06Cr18Ni11Ti的動(dòng)態(tài)力學(xué)性能;基于實(shí)驗(yàn)數(shù)據(jù)分析提出了06Cr18Ni11Ti的修正Johnson-Cook本構(gòu)模型;在0.0056s-1~2500s-1的應(yīng)變率范圍、20oC~300oC的變形溫度范圍內(nèi)采用本模型對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行了擬合,擬合優(yōu)度較好,R2達(dá)到0.97042,實(shí)驗(yàn)數(shù)據(jù)和預(yù)測(cè)數(shù)據(jù)間的平均相對(duì)誤差為2.629%。(3)建立了06Cr18Ni11Ti單顆磨粒平面磨削的有限元模型(ABAQUS模型),對(duì)不同砂輪速度、不同未變形磨屑厚度和不同磨粒切刃前角條件下的磨削加工進(jìn)行了仿真,獲得了磨削參數(shù)變化對(duì)磨削力、等效應(yīng)力及磨削區(qū)溫度的影響規(guī)律。(4)設(shè)計(jì)了正交試驗(yàn)研究方案,利用大橋MV-40型立式加工中心進(jìn)行了06Cr18Ni11Ti窄深槽的緩進(jìn)磨削加工;采用極差分析和表面形貌顯微圖像相結(jié)合的方法對(duì)窄深槽槽壁的表面質(zhì)量進(jìn)行了分析,探索了磨削參數(shù)對(duì)窄深槽槽壁表面粗糙度Ra值的影響規(guī)律;確定了使用大橋MV-40型立式加工中心緩進(jìn)磨削06Cr18Ni11Ti窄深槽的最優(yōu)工藝參數(shù)組合;采用偏最小二乘回歸法建立了窄深槽槽壁表面粗糙度Ra值的預(yù)測(cè)模型,該模型經(jīng)擬合優(yōu)度檢驗(yàn)得R2為0.94656,擬合度較好;在95%的置信水平下,經(jīng)方差檢驗(yàn)得P=0.038574,回歸模型整體顯著。
[Abstract]:Narrow deep groove is a special structure with a ratio of depth to width of more than 2 and a slot width of less than 4 mm. It often appears on important parts in aviation, automobile and other fields. The rotor circumference of variable pump is usually distributed with 10 ~ 12 radial straight slots. Such grooves are typical narrow deep grooves. The machining of high precision narrow deep grooves is a difficult problem in the mechanical field. When variable pump conveys acid-corrosive materials, the rotor itself is required to have corrosion resistance. 06Cr18Ni11Ti stainless steel not only has high strength but also good toughness. It has strong resistance to intergranular corrosion, good cold and hot working performance and weldability. It is of certain theoretical significance and practical value to select it as the rotor material and to study the machining of narrow and deep grooves on it. In this paper, the dynamic mechanical properties of 06Cr18Ni11Ti are studied, and the quasi-static uniaxial compression experiments of the material at room temperature are carried out. In the experiment of split Hopkinson pressure bar at room temperature and high temperature, the true stress-strain curve of the material is obtained, the constitutive model of the material is established, and the plane grinding process of 06Cr18Ni11Ti is simulated by the finite element analysis software ABAQUS. Using a monolayer electroplated CBN wheel, Through the vertical machining center of MV-40 model bridge, the experimental research on the slow progressive grinding of 06Cr18Ni11Ti stainless steel with narrow and deep groove was carried out. The research work was supported by the National Natural Science Foundation of China. The main contents of this paper are as follows: 1) the stainless rust has been studied. The present situation of steel and its processing technology; The processing technology of narrow deep groove is analyzed in this paper. The grinding technology of narrow deep groove and its application are described in detail. The quasi-static uniaxial compression experiment and split Hopkinson pressure bar experiment at room temperature and high temperature are carried out. The dynamic mechanical properties of 06Cr18Ni11Ti are studied, the modified Johnson-Cook constitutive model of 06Cr18Ni11Ti is proposed based on the analysis of experimental data, and the experimental data are fitted within the strain rate range of 0.0056s-1102500s-1 and the deformation temperature range of 20oC / 300oC. The relative error between experimental data and prediction data is 2.629. The finite element model of single abrasive grain plane grinding of 06Cr18Ni11Ti has been established, and the Abaqus model has been established for different grinding wheel velocities. The grinding process with different thickness of undeformed debris and different cutting edge angle of abrasive particle is simulated, and the influence of grinding parameters on grinding force, equivalent stress and temperature of grinding zone is obtained. The grinding of 06Cr18Ni11Ti narrow deep groove was carried out by using the bridge MV-40 vertical machining center, and the surface quality of the narrow deep groove wall was analyzed by means of range analysis and surface morphology micrograph. The influence of grinding parameters on the surface roughness Ra value of narrow deep groove wall is explored, and the optimum technological parameters combination of slowly advancing grinding 06Cr18Ni11Ti narrow deep groove with MV-40 vertical machining center of bridge is determined. Using partial least square regression method, the prediction model of surface roughness Ra value of narrow deep groove wall is established. The fitting coefficient of the model is 0.94656, and the regression model is significant under the confidence level of 95%.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG580.6

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