本文選題：超聲波光整 + 表層組織　； 參考：《濟南大學》2015年碩士論文

【摘要】：超聲波光整強化是一種新興的表面處理技術,該技術通過高頻振動的加工頭在工件表面施加滾動擠壓復合作用,使工件表層組織產(chǎn)生強烈塑性變形,實現(xiàn)表層晶粒細化,在表層一定厚度內(nèi)預置殘余壓應力,提高零件的疲勞壽命,提高表層顯微硬度,改善耐磨性能和抗腐蝕性等。目前該技術處于推廣試用階段,在基礎強化理論和工程實際應用方面所做的工作較少,本文選用典型材料為研究對象,利用正交試驗的方法,將關鍵工藝參數(shù)即工作頻率、振幅和壓力作為實驗因素,系統(tǒng)分析加工過程中工件表層組織的變形機理,從組織變形的角度分析該技術的強化原理,此外通過檢測的手段得出該技術對于不同類型材料的工件表面力學特征值影響規(guī)律。本文利用L9(34)正交表設計實驗,以40Cr、GCr15和工業(yè)純鐵為實驗材料,研究關鍵工藝參數(shù)工作頻率、振幅和壓力對于工件表面粗糙度的影響規(guī)律。利用SEM和超景深顯微鏡等手段對加工前后工件表面三維形貌和表層微觀組織進行觀察,找出不同材料工件表面流變層分布情況,發(fā)現(xiàn)加工后工件表層晶粒沿軸向拉伸,呈扁平狀,表層組織變形程度沿軸向有波動,分析加工過程中工件表層組織的變形機理。借助盲孔法殘余應力檢測儀對不同材料加工前后工件表面殘余應力進行檢測,得到超聲波光整強化技術可以有效地將工件表面初始時的殘余拉應力轉(zhuǎn)變成有利的殘余壓應力。提出一種多次鉆孔的逐層應力釋放方法,根據(jù)每層的應力應變檢測值變化趨勢,分析殘余應力在厚度方向上的分布情況。利用顯微硬度計對加工后工件表面硬化層進行檢測,對比得到加工后工件表面硬化情況。在測試過程中,通過減少試樣厚度方向位移增加切向位移的方法,實現(xiàn)了在有限厚度方向上的顯微硬度值測量,分析表面硬化層內(nèi)部顯微硬度值的分布情況,根據(jù)測試需要設計了一種可調(diào)角度的顯微硬度測試載物臺。
[Abstract]:Ultrasonic finishing strengthening is a new technology of surface treatment. The technology exerts rolling extrusion compound action on the surface of workpiece through high frequency vibration machining head, which makes the surface structure of workpiece produce strong plastic deformation and realize the grain refinement of surface layer. The residual compressive stress is preset in a certain thickness of the surface layer to increase the fatigue life of the parts, to improve the microhardness of the surface layer, to improve the wear resistance and corrosion resistance, and so on. At present, the technology is in the stage of popularization and trial, and less work has been done in the field of foundation strengthening theory and practical engineering application. In this paper, typical materials are chosen as the research object, and the key technological parameters, namely the working frequency, are used in the orthogonal test. The amplitude and pressure are used as experimental factors to systematically analyze the deformation mechanism of the surface structure of the workpiece during the machining process, and the strengthening principle of the technique is analyzed from the point of view of the microstructure deformation. In addition, the influence of this technique on the mechanical eigenvalues of workpiece surface of different types of materials is obtained by means of testing. In this paper, an experiment is designed by using L9 / 34) orthogonal table. Using 40CrGCr15 and industrial pure iron as experimental materials, the effects of working frequency, amplitude and pressure on the surface roughness of workpiece are studied. The surface morphology and microstructure of workpiece before and after processing were observed by means of SEM and hyperfield microscope. The distribution of rheological layer on workpiece surface of different materials was found, and the grain of workpiece surface was stretched along axial direction after processing. The deformation degree of the surface structure fluctuates along the axial direction, and the deformation mechanism of the surface structure of the workpiece is analyzed. The residual stress of workpiece surface before and after processing with blind hole method was measured by means of the blind hole method, and the ultrasonic finishing strengthening technique was obtained, which can effectively transform the residual tensile stress of the workpiece surface into favorable residual compressive stress at the beginning of the workpiece surface. In this paper, a method of stress release from multiple boreholes is proposed, and the distribution of residual stress in thickness direction is analyzed according to the change trend of stress and strain detection value in each layer. The workpiece surface hardening layer was tested by microhardness tester, and the workpiece surface hardening was compared. In the testing process, by reducing the thickness direction displacement of the specimen and increasing the tangential displacement, the microhardness value in the finite thickness direction is measured, and the distribution of the microhardness value in the surface hardening layer is analyzed. According to the need of testing, a microhardness testing platform with adjustable angle is designed.
【學位授予單位】：濟南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG66

【相似文獻】

相關期刊論文 前10條

1 鄭金山;;論鋼球光整內(nèi)孔[J];機械工藝師;1989年02期

2 陸永海;對織針表面光整的認識[J];紡織器材;1994年06期

3 游先政,鄒桂明;鍍鋅非光整邊缺陷產(chǎn)生原因及改進措施探索[J];四川冶金;1999年05期

4 陸永海;針織用針熱處理及表面光整工藝的實踐[J];紡織器材;2005年01期

5 韓強;;超聲波表面光整新技術應用[J];紡織機械;2011年02期

6 曹偉忠;;提高液壓件產(chǎn)品質(zhì)量的核心技術—去毛刺光整工藝[J];液壓氣動與密封;2012年07期

7 莊曙東;安魯陵;王婷婷;郭光輝;;高速工具約束磨料表面光整工藝[J];東南大學學報(自然科學版);2013年04期

8 劉伏林;馮書安;;深孔的滾壓光整精加工[J];機械工程師;1990年03期

9 曹偉忠;王鵬;;變量柱塞泵、馬達、整體式多路閥零件的去毛刺、光整設備和工具[J];液壓氣動與密封;2012年10期

10 李文輝,楊世春,楊勝強;主軸行星式滾磨工藝光整曲軸類零件的研究[J];太原理工大學學報;2002年01期

相關會議論文 前3條

1 劉金成;;平光整液廢水厭氧生物處理實驗研究[A];自動化技術與冶金流程節(jié)能減排——全國冶金自動化信息網(wǎng)2008年會論文集[C];2008年

2 姚新改;軋剛;丁艷紅;;旋轉(zhuǎn)磁場磁力光整內(nèi)表面研磨機理研究[A];2007年中國機械工程學會年會之第12屆全國特種加工學術會議論文集[C];2007年

3 陳煜東;劉宇方;;本鋼二輥光整機鍍鋅生產(chǎn)工藝的探討[A];第二屆薄鋼板質(zhì)量研討會論文集[C];2002年

相關碩士學位論文 前8條

1 梁津;不銹鋼閥套內(nèi)孔超聲輔助光整加工技術研究[D];大連理工大學;2015年

2 魯帥帥;超聲波光整強化表層組織變形機理及力學性能研究[D];濟南大學;2015年

3 汪亮;等離子熔積直接成形金屬原型表面激光光整關鍵技術[D];華中科技大學;2004年

4 秦建文;可控磁場磁力光整加工技術研究[D];大連理工大學;2007年

5 孫鑒波;硅材料場致普克爾斯效應和光整流效應的研究[D];吉林大學;2009年

6 周愿愿;齒輪化學機械光整加工技術研究[D];大連理工大學;2010年

7 穆天嘯;IF鋼光整色差成因有限元分析及其二次開發(fā)[D];武漢科技大學;2013年

8 翟洪飛;粘彈性磁性磨具的制備及其光整實驗研究[D];太原理工大學;2012年

，

本文編號：1836002