發(fā)布時間：2018-03-06 09:03

  本文選題：ADC12擠壓鑄造件　切入點：拋丸處理　出處：《哈爾濱理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：拋丸處理技術(shù)被普遍應(yīng)用于鑄造件生產(chǎn)的后續(xù)表面處理,最初拋丸處理主要應(yīng)用于鋼鐵等重金屬的表面清理,所以拋丸處理也被成為拋丸清理,隨著輕量化進程的發(fā)展,大量鋁合金零件的生產(chǎn)需要拋丸處理。對鋁合金件的拋丸處理不僅限于清理其表面,更主要是對零件進行表面性能的強化,比如:改變表面形貌、粗糙度的改變、提高表面硬度、增加表面殘余壓應(yīng)力、提高疲勞強度。但拋丸處理工藝對鋁合金鑄件表面狀態(tài)影響還沒有進行過系統(tǒng)性的研究。本文以ADC12鋁合金擠壓鑄造件為試驗對象,研究了18種不同拋丸處理工藝對ADC12鋁合金擠壓鑄造件的表面形貌、表面硬度、粗糙度、強化層厚度和表面殘余應(yīng)力的影響。研究結(jié)果表明:經(jīng)拋丸處理后ADC12鋁合金擠壓鑄造件表面硬度由100HV提高到112.7-163HV范圍,粗糙度由Ra1.600提高到Ra2.480-6.515范圍。影響規(guī)律為:試樣粗糙度隨拋丸時間增加而略有提高,隨拋丸速度的提高而提高,0.45mm和0.25mm兩種直徑鋼丸對試件粗糙度影響差別不大。粗糙度最小值和最大值均在拋丸時間400s工藝中出現(xiàn)。試樣硬度隨拋丸時間的增加而提高,隨拋丸速度的提高而提高,鋼丸直徑大的工藝試樣表面硬度高。影響試件硬度的工藝由主要到次要的排序為:拋丸速度、拋丸時間、鋼丸直徑。拋丸后ADC12鋁合金擠壓鑄造件表面的硬度與粗糙度成正比關(guān)系。拋丸后試樣表面硬度在主要由表面的強化層厚度、斷層、顆粒組織決定。凹坑的深度和形貌起伏也間接體現(xiàn)出拋丸強化層厚度,凹陷越大試樣表面硬度越高。凹坑深度增大、強化層厚增加和表面缺陷程度的增大使表面更容易形成大的最高點和最低點之差Ra,從而使表面粗糙度增大。硬度梯度數(shù)據(jù)可以顯示拋丸強化層厚度,強化層厚度最小值為0.22mm,最大值為1.12mm,試驗面硬度越高的試樣其強化層厚度越大,拋丸工藝對硬化層厚度影響跟隨對硬度影響規(guī)律。拋丸處理能有效提高表面殘余壓應(yīng)力,經(jīng)拋丸試樣殘余應(yīng)力由未經(jīng)拋丸的4.30MPa提高到7.64MPa。試件表面殘余應(yīng)力隨拋丸速度、鋼丸直徑、拋丸時間的提高而增大,拋丸速度為主要因素。拋丸處理能夠改善工件表層拉伸性能,但不會改變內(nèi)部組織和缺陷情況。
[Abstract]:Shot blasting treatment technology is widely used in the subsequent surface treatment of casting parts production. At first, shot blasting treatment is mainly used to clean the surface of heavy metals, such as iron and steel, so shot blasting treatment is also called shot blasting cleaning, with the development of lightweight process, The production of a large number of aluminum alloy parts needs shot blasting treatment. The shot blasting treatment of aluminum alloy parts is not only limited to cleaning its surface, but also mainly strengthening the surface properties of the parts, such as changing the surface morphology, changing the roughness, The effect of shot blasting on the surface state of aluminum alloy castings has not been systematically studied. In this paper, ADC12 aluminum alloy squeeze casting parts are taken as experimental objects. The surface morphology, surface hardness and roughness of ADC12 aluminum alloy were studied by 18 different shot blasting processes. The effect of strengthening layer thickness and surface residual stress. The results show that the surface hardness of ADC12 aluminum alloy squeeze casting parts increases from 100HV to 112.7-163HV after shot blasting. The roughness is increased from Ra1.600 to Ra2.480-6.515. The law of influence is that the roughness of the sample increases slightly with the time of shot blasting. With the increase of shot blasting speed, the effect of 0.45mm and 0.25mm diameter steel pellets on the roughness of the specimen is not different. The minimum and maximum roughness of the sample appear in the 400s process of shot blasting time, and the hardness of the sample increases with the increase of shot blasting time. With the increase of shot blasting speed, the surface hardness of the process sample with large diameter of steel shot is higher. The order of the process influencing the hardness of the specimen is: shot blasting speed, shot blasting time, Diameter of steel pellets. After shot blasting, the hardness of ADC12 aluminum alloy squeeze casting parts is proportional to the roughness. After shot blasting, the hardness of the specimen surface is mainly determined by the thickness of the strengthening layer and the fault of the surface. The depth and shape fluctuation of the pit also indirectly reflect the thickness of the shot blasting strengthened layer, the larger the sag is, the higher the surface hardness of the specimen is, and the deeper the pit depth is, the higher the surface hardness is. The increase in the thickness of the strengthened layer and the increase in the degree of surface defects make it easier for the surface to form a large difference between the highest and lowest points, thereby increasing the surface roughness. The hardness gradient data can show the thickness of the shot peening strengthened layer. The thickness of hardening layer is 0.22 mm and the maximum is 1.12 mm. The thicker the specimen with higher hardness of test surface, the greater the thickness of hardening layer is, and the effect of shot blasting on the thickness of hardened layer follows the rule of hardness. Shot blasting treatment can effectively increase the residual compressive stress of the surface. The residual stress of the sample was increased from 4.30MPa to 7.64MPa. The surface residual stress of the specimen increased with the increase of the shot blasting velocity, the diameter of the steel shot, the shot blasting time, and the shot blasting velocity was the main factor. The tensile properties of the surface layer of the workpiece were improved by shot blasting treatment. But it will not change the internal organization and defects.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG246

【相似文獻】

相關(guān)期刊論文 前10條

1 李通;;拋丸分析與計算(上)[J];鑄造機械;1978年01期

2 孫建坪;;拋丸器主要性能的試驗研究[J];鑄造機械;1979年04期

3 ;拋丸器拋丸機理的試驗與研究[J];鑄造設(shè)備研究;1982年03期

4 張萬鈞;;一種新穎高效拋丸器[J];鑄造機械;1985年02期

5 韋民;;拋丸設(shè)備用彈丸的發(fā)展方向[J];鑄造機械;1985年04期

6 吳浚郊;;拋丸清理設(shè)備的試驗研究和設(shè)計[J];中國鑄機;1987年05期

7 曾輝;;拋丸器分丸輪直徑的計算[J];中國鑄機;1990年02期

8 楊森;;吊鏈連續(xù)拋丸清理室的改進[J];中國鑄機;1990年04期

9 孫少純;;國內(nèi)外拋丸器研究的發(fā)展概況[J];鑄造設(shè)備研究;1991年01期

10 周安田;張建斌;;拋丸室設(shè)計[J];鑄造設(shè)備研究;1993年03期

相關(guān)會議論文 前6條

1 姚宙;劉文濤;胡軍平;;拋丸質(zhì)量控制[A];2012年河北省軋鋼技術(shù)暨學術(shù)年會論文集（下）[C];2012年

2 徐金鴻;;機械化裝卸料自動拋丸滾筒[A];第十二屆全國鑄造年會暨2011中國鑄造活動周論文集[C];2011年

3 王守仁;翟永真;;淺談鑄件清理過程中的拋丸清理設(shè)備及磨料參數(shù)選擇與優(yōu)化設(shè)計[A];中國鑄造行業(yè)第五屆高層論壇論文集[C];2011年

4 Victor Dorsten;Lorenzo Fachinelli;何二明;張軍;;新一代MHD連續(xù)鍍鋅/Galfan~汶技術(shù)[A];2011金屬制品行業(yè)技術(shù)信息交流會論文集[C];2011年

5 王國信;;試談拋丸機葉片的磨損兼論曲面葉片的優(yōu)越性[A];第五屆全國摩擦學學術(shù)會議論文集（下冊）[C];1992年

6 譚學文;向東;李小華;;蓋類產(chǎn)品拋丸代替打磨項目報告[A];2012(第22屆)重慶市鑄造年會論文集[C];2012年

相關(guān)重要報紙文章 前1條

1 記者 駱戰(zhàn)紅　阮挺峰;玉環(huán)拉絲行業(yè)推廣清潔生產(chǎn)工藝[N];臺州日報;2009年

相關(guān)碩士學位論文 前10條

1 閆永陣;輥道通過式拋丸機關(guān)鍵部件有限元分析與結(jié)構(gòu)優(yōu)化[D];濟南大學;2015年

2 張路;帶鋼濕式拋丸試驗裝置開發(fā)及鋼丸液力輸運技術(shù)研究[D];華東理工大學;2016年

3 孟曉歐;拋丸處理對ADC12擠壓鑄造件表面狀態(tài)影響[D];哈爾濱理工大學;2017年

4 張丹;水平移動式拋丸機械工作機理研究及彈丸的動態(tài)仿真分析[D];吉林大學;2007年

5 于茂旺;拋丸器耐磨件失效原因探討及分丸輪結(jié)構(gòu)對拋丸率的影響[D];山東大學;2007年

6 李微;拋丸機葉片的設(shè)計及分析[D];吉林大學;2007年

7 韓強;轉(zhuǎn)軌道式自動拋丸機設(shè)計[D];山東大學;2011年

8 宋廣全;懸鏈式拋丸清理機性能分析和結(jié)構(gòu)優(yōu)化[D];濟南大學;2013年

9 張偉;臺車式拋丸機臺車承載系統(tǒng)的研究[D];濟南大學;2013年

10 方素蘭;基于嵌入式的拋丸設(shè)備遠程監(jiān)控系統(tǒng)研究[D];青島理工大學;2010年

，

本文編號：1574184