發(fā)布時(shí)間：2018-11-21 10:45

【摘要】：本文以LKP550型移動(dòng)式拋丸機(jī)的拋丸器為研究對(duì)象,采用離散元軟件模擬鋼丸在拋丸器中的宏觀運(yùn)動(dòng)過(guò)程,分析鋼丸直徑、葉輪轉(zhuǎn)速、分丸輪與葉輪安裝角度對(duì)鋼丸拋射速度的穩(wěn)定性以及大小的影響,為拋丸強(qiáng)化分析確定了拋丸工藝參數(shù)的優(yōu)化范圍,隨后以Q345鋼為例,對(duì)鋼丸沖擊Q345鋼后應(yīng)力和應(yīng)變的微觀過(guò)程進(jìn)行了有限元分析,獲得了鋼丸直徑與鋼丸拋射速度對(duì)靶材殘余應(yīng)力場(chǎng)分布的影響規(guī)律。主要研究結(jié)論如下:對(duì)LKP550型移動(dòng)式拋丸機(jī)中鋼丸在拋丸器內(nèi)沿分丸輪葉片和葉輪葉片的演變過(guò)程以及拋丸強(qiáng)化機(jī)制進(jìn)行了理論分析,獲得了影響鋼丸拋射速度和拋丸強(qiáng)化效果的主要因素。對(duì)拋丸過(guò)程中鋼丸在拋丸器內(nèi)的運(yùn)動(dòng)過(guò)程進(jìn)行了離散元數(shù)值分析,模擬結(jié)果表明:葉輪轉(zhuǎn)速對(duì)鋼丸拋射速度的影響最大,驗(yàn)證了理論分析中葉輪轉(zhuǎn)速與鋼丸拋射速度成線性正比的正確性,且鋼丸直徑和分丸輪與葉輪安裝角度是影響鋼丸拋射速度的主要因素。鋼丸直徑、葉輪轉(zhuǎn)速、分丸輪與葉輪安裝角度過(guò)小會(huì)導(dǎo)致鋼丸拋射速度的不穩(wěn)定,葉輪轉(zhuǎn)速過(guò)大也會(huì)引起鋼丸拋射速度的不穩(wěn)定性。為了保證鋼丸拋射速度的穩(wěn)定性和拋丸效果,選擇鋼丸直徑在Φ0.6mm~Φ2.0mm之間,葉輪轉(zhuǎn)速在2250rpm~2950rpm之間,分丸輪與葉輪安裝角度在11°~20°之間,以此作為后續(xù)拋丸強(qiáng)化分析的工藝參數(shù)。在離散元模擬結(jié)果的基礎(chǔ)上,選擇優(yōu)化后的拋丸工藝參數(shù),以Q345鋼為例,重點(diǎn)研究了Φ0.6mm~Φ2.0mm的鋼丸直徑和60m/s~80m/s的鋼丸拋射速度對(duì)拋丸后材料表層應(yīng)力應(yīng)變微觀過(guò)程的影響。結(jié)果表明:在相同鋼丸拋射速度下鋼丸直徑對(duì)拋丸殘余應(yīng)力場(chǎng)的深度影響較大,在相同鋼丸直徑下鋼丸拋射速度對(duì)殘余應(yīng)力的大小影響較大。鋼丸拋射速度和直徑過(guò)小則拋丸強(qiáng)化效果不明顯,二者過(guò)大會(huì)導(dǎo)致材料表層產(chǎn)生拉應(yīng)力而破壞拋丸強(qiáng)化效果。對(duì)于Q345鋼,鋼丸直徑在Φ1.0mm~Φ1.4mm之間,鋼丸拋射速度在70m/s~75m/s之間是合適的拋丸強(qiáng)化工藝參數(shù)組合。此外,通過(guò)離散元對(duì)拋丸過(guò)程中鋼丸宏觀運(yùn)動(dòng)過(guò)程的分析,以及隨后在離散元分析的基礎(chǔ)上對(duì)鋼丸沖擊Q345鋼表面后應(yīng)力應(yīng)變的微觀分析,發(fā)現(xiàn)將離散元方法與有限元方法結(jié)合研究拋丸過(guò)程的演變和機(jī)理具有可行性。
[Abstract]:In this paper, taking the shot blasting device of LKP550 type mobile shot blasting machine as the research object, using discrete element software to simulate the macroscopic motion process of the steel shot in the shot blasting machine, the diameter of the steel shot and the rotating speed of the impeller are analyzed. The influence of the installation angle of pelletizing wheel and impeller on the stability and size of the projectile ejection velocity, the optimum range of shot blasting process parameters was determined for shot peening strengthening analysis, and then the Q345 steel was taken as an example. The microcosmic process of stress and strain in Q345 steel was analyzed by finite element method. The influence of the diameter of steel pellet and the velocity of projectile ejection on the distribution of residual stress field of the target was obtained. The main conclusions are as follows: the evolution process of steel pellets along the pelleting wheel blade and impeller blade and the strengthening mechanism of shot blasting in LKP550 type mobile shot blasting machine are analyzed theoretically. The main factors influencing the ejection speed and the strengthening effect of the steel shot were obtained. The discrete element numerical analysis of the motion of the steel shot in the shot blasting device is carried out. The simulation results show that the speed of the impeller has the greatest influence on the ejection velocity of the steel shot. The correctness of the linear ratio between the impeller speed and the projectile ejection velocity is verified in the theoretical analysis, and the diameter of the steel shot and the installation angle of the splitter wheel and the impeller are the main factors affecting the projectile ejection velocity. The diameter of steel pellets, the speed of impellers and the installation angle of pellets and impellers will lead to the instability of the ejection velocity of the steel pellets, and the instability of the ejection velocities of the steel pellets will also be caused by the excessive rotational speed of the impellers. In order to ensure the stability of the projectile ejection speed and the shot blasting effect, the diameter of the steel shot is between 桅 0.6mm ~ 桅 2.0mm, the rotational speed of the impeller is between 2250rpm~2950rpm and the installation angle of the split-shot wheel and the impeller is between 11 擄~ 20 擄, which is used as the technological parameter of the subsequent shot blasting strengthening analysis. On the basis of the simulation results of discrete element, the optimized parameters of shot blasting are selected, and the Q345 steel is taken as an example. The effects of diameter of 桅 0.6mm ~ 桅 2.0mm steel pellets and 60m/s~80m/s 's projectile ejection velocity on the micro-process of stress and strain in the surface layer of the material after shot blasting were studied. The results show that the diameter of the steel shot has a great influence on the depth of the residual stress field under the same projectile ejection velocity, and the steel shot ejection velocity has a great influence on the residual stress under the same diameter of the steel shot. When the velocity and diameter of steel shot are too small, the strengthening effect of shot blasting is not obvious, but the tensile stress on the surface layer of the material is caused by the excessive assembly of both of them and the strengthening effect of shot blasting is destroyed. For Q345 steel, the diameter of the steel shot is between 桅 1.0mm and 桅 1.4mm, and the ejection velocity of the steel shot is the appropriate combination of the technological parameters of shot blasting between 70m/s~75m/s and 桅 1.0mm. In addition, the macroscopic motion of the steel shot during shot blasting is analyzed by discrete element method, and the stress and strain of the steel shot impacting the surface of Q345 steel are analyzed on the basis of discrete element analysis. It is found that it is feasible to combine discrete element method with finite element method to study the evolution and mechanism of shot blasting process.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG173

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳俊嶺;李哲旭;舒文雅;李金威;;不同應(yīng)變率下Q345鋼材力學(xué)性能試驗(yàn)研究[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2015年06期

2 游小平;黃崢;游衛(wèi)平;毛衛(wèi)東;余志偉;;路面拋丸機(jī)拋丸器內(nèi)鋼丸顆粒運(yùn)動(dòng)過(guò)程的EDEM仿真分析[J];公路與汽運(yùn);2014年04期

3 王玖;張志遠(yuǎn);方雄;;彈丸直徑和速度對(duì)噴丸殘余應(yīng)力分布的影響分析[J];材料科學(xué)與工程學(xué)報(bào);2013年04期

4 陳宗橋;;拋丸機(jī)調(diào)試解析[J];特鋼技術(shù);2013年01期

5 王仁智;;金屬材料的噴丸強(qiáng)化原理及其強(qiáng)化機(jī)理綜述[J];中國(guó)表面工程;2012年06期

6 李進(jìn)霞;張偉杰;張素香;;有限元法及應(yīng)用狀況[J];科技創(chuàng)新導(dǎo)報(bào);2012年31期

7 王陸軍;;強(qiáng)化拋丸技術(shù)現(xiàn)狀與發(fā)展[J];現(xiàn)代零部件;2012年09期

8 王強(qiáng);;金屬零件的噴丸強(qiáng)化技術(shù)[J];金屬加工(熱加工);2012年07期

9 肖紅亮;時(shí)捷;雍岐龍;;有限元模擬在研究彈丸沖擊鋼板過(guò)程中的應(yīng)用[J];材料導(dǎo)報(bào);2011年15期

10 孫海霞;戴京濤;姜偉;唐仁剛;;有限元法在機(jī)械工程中的應(yīng)用與發(fā)展[J];科技創(chuàng)新導(dǎo)報(bào);2011年03期

相關(guān)博士學(xué)位論文 前1條

1 詹科;S30432奧氏體不銹鋼噴丸強(qiáng)化及其表征研究[D];上海交通大學(xué);2013年

相關(guān)碩士學(xué)位論文 前4條

1 王利平;噴丸殘余應(yīng)力場(chǎng)及表面粗糙度數(shù)值模擬研究[D];山東大學(xué);2015年

2 陳毅;20CrMnMo齒輪齒根殘余應(yīng)力理論及試驗(yàn)研究[D];重慶大學(xué);2013年

3 侯琳;基于EDEM離散元方法的拋丸器工作過(guò)程分析[D];濟(jì)南大學(xué);2012年

4 侯占忠;噴丸工藝的數(shù)值分析[D];華中科技大學(xué);2006年

，

本文編號(hào)：2346744