本文選題：熱能去毛刺 + AutoReaGas　； 參考：《中北大學(xué)》2012年碩士論文

【摘要】：在機(jī)械加工過程中，，工件的表面往往會產(chǎn)生許多不同形狀以及厚度的毛刺，毛刺很小但危害很大，有時(shí)甚至?xí)䦟?dǎo)致安全事故。所以，安全有效的去除毛刺已成為工件加工過程中的一道關(guān)鍵工序。而熱能去毛刺法可以有效快速的去除不同材料工件的毛刺，在去毛刺領(lǐng)域具有很高的實(shí)際應(yīng)用價(jià)值。雖然熱能去毛刺法的工藝水平日趨成熟，但是系統(tǒng)的研究熱能去毛刺機(jī)理以及預(yù)混合可燃性氣體燃燒爆炸后，爆燃沖擊波對工件及毛刺的影響缺乏有效、科學(xué)的數(shù)據(jù)。 本文以氫氧混合氣體作為熱能去毛刺中的預(yù)混合氣體，應(yīng)用CFD流體力學(xué)軟件AutoReaGas以及后處理軟件AutoDyn，通過建立具體的爆炸缸數(shù)學(xué)模型，建立了不同的工件以及毛刺尺寸的數(shù)學(xué)模型，劃分網(wǎng)格，設(shè)置不同的初始條件，采用湍流燃燒模型，基于Navier—Stokes方程進(jìn)行仿真計(jì)算，并對不同參數(shù)下氫氧預(yù)混合可燃性氣體燃燒爆炸產(chǎn)生的結(jié)果進(jìn)行分析，總結(jié)不同參數(shù)對熱能去毛刺法的適用性并得出如下結(jié)論： （1）工件尺寸小范圍變化對預(yù)混合可燃性氣體爆燃沖擊波的影響很小。所以工件面與體積之比越大，單位時(shí)間內(nèi)吸收的熱量就越多，經(jīng)研究發(fā)現(xiàn)，在工件面與體積之比大于20以上的時(shí)候，利用熱能去毛刺法會破壞金屬工件表面的金相組織； （2）毛刺厚度的大小影響著爆燃沖擊波的超壓、溫度以及速度。毛刺越厚，其爆燃沖擊波的超壓、溫度以及速度也就越大。經(jīng)研究發(fā)現(xiàn)，在毛刺厚度與工件薄壁處的比值大于0.1的時(shí)候，利用熱能去毛刺會破壞金屬工件表面的金相組織； （3）在利用熱能去毛刺過程中，預(yù)混合可燃性氣體混合比的變化影響其爆燃沖擊波的超壓、溫度、化學(xué)反應(yīng)速率以及速度。其預(yù)混合可燃性氣體的混合比為當(dāng)量比時(shí)，爆燃沖擊波的各項(xiàng)參數(shù)均為最大值。同時(shí)給出了不同材料工件需要的預(yù)混合可燃性氣體比值的適用范圍； （4）在利用熱能去毛刺過程中，預(yù)混合可燃性氣體初始壓力的變化影響其反應(yīng)速率、爆燃沖擊波產(chǎn)生的超壓；并且預(yù)混合可燃性氣體燃燒爆炸后的超壓與初始壓力呈近似的線性關(guān)系；但是，預(yù)混合可燃性氣體燃燒爆炸產(chǎn)生的溫度和沖擊波的速度并不隨著初始壓力的增加而變化；同時(shí)給出了不同材料工件需要的初始壓力的適用范圍； （5）工件裝填密度的大小直接影響著預(yù)混合氣體燃燒爆炸后的超壓、化學(xué)反應(yīng)速率、溫度和爆燃沖擊波的速度。工件裝填密度越大其預(yù)混合氣體燃燒爆炸后的超壓、化學(xué)反應(yīng)速率、溫度和爆燃沖擊波的速度也就越小。 本論文研究所取得的成果可為今后的工程應(yīng)用以及安全生產(chǎn)提供一定的理論指導(dǎo)。
[Abstract]:In the process of machining, many burrs with different shapes and thickness are often produced on the surface of the workpiece. The burrs are small but harmful, and sometimes even lead to safety accidents. Therefore, the safe and effective burr removal has become a key process in the process of workpiece processing. The thermal deburring method can effectively and quickly remove the burrs of different materials, which has a high practical value in the field of deburring. Although the technology level of thermal energy deburring method is becoming more and more mature, the mechanism of thermal energy deburring and the effect of deflagration shock wave on workpiece and burr after combustion explosion of pre-mixed combustible gas are studied systematically. In this paper, the mixture of hydrogen and oxygen is used as the premixed gas in the thermal energy deburring. By using the CFD fluid dynamics software AutoReaGas and the post processing software AutoDyng, the mathematical models of different workpieces and burr sizes are established by establishing a specific mathematical model of the explosion cylinder. With different initial conditions, the turbulent combustion model is adopted and simulated based on Navier-Stokes equation. The results of combustion and explosion of hydrogen and oxygen premixed combustible gas under different parameters are analyzed. The applicability of different parameters to the thermal deburring method is summarized and the following conclusions are drawn: (1) the influence of the small range of workpiece size on the deflagration shock wave of pre-mixed combustible gas is very small. Therefore, the larger the ratio of workpiece surface to volume, the more heat is absorbed in unit time. It is found that when the ratio of workpiece surface to volume is more than 20, the metallographic structure of metal workpiece surface will be destroyed by using thermal energy deburring method. (2) the thickness of burr affects the overpressure, temperature and velocity of deflagration shock wave. The thicker the burr, the greater the pressure, temperature and velocity of the deflagration shock wave. It is found that when the ratio of burr thickness to workpiece thin-wall is greater than 0.1, the metallographic structure of metal workpiece surface will be destroyed by thermal energy deburring. (3) in the process of thermal energy deburring, The change of mixing ratio of premixed combustible gas affects the overpressure, temperature, chemical reaction rate and velocity of deflagration shock wave. When the mixing ratio of premixed combustible gas is equivalent, the parameters of deflagration shock wave are all the maximum. At the same time, the applicable range of the ratio of pre-mixed combustible gas required for different materials and workpieces is given. (4) the change of initial pressure of pre-mixed combustible gas affects its reaction rate in the process of burring with thermal energy. The overpressure caused by deflagration shock wave and the linear relation between the overpressure and the initial pressure after combustion explosion of premixed combustible gas; however, The temperature and velocity of shock wave produced by combustion explosion of pre-mixed combustible gas do not change with the increase of initial pressure, and the applicable range of initial pressure for different materials is given. (5) the filling density of the workpiece directly affects the overpressure, the chemical reaction rate, the temperature and the deflagration shock wave velocity after the combustion and explosion of the premixed gas. The higher the loading density of the workpiece, the smaller the overpressure, the chemical reaction rate, the temperature and the velocity of the deflagration shock wave after the combustion and explosion of the premixed gas. The results obtained in this paper can provide some theoretical guidance for engineering application and production safety in the future.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH161.14;TG66

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馮長根,陳林順,錢新明;點(diǎn)火位置對獨(dú)頭巷道中瓦斯爆炸超壓的影響[J];安全與環(huán)境學(xué)報(bào);2001年05期

2 張惠生;機(jī)械零件去毛刺工藝的現(xiàn)狀與發(fā)展[J];北京建筑工程學(xué)院學(xué)報(bào);2001年04期

3 高爾新,白春華,薛玉,成志輝,王禮;巷道瓦斯爆炸的計(jì)算機(jī)模擬研究[J];爆破;2003年S1期

4 皮啟德;熱能去毛刺鋅合金鈍化件的前處理[J];材料保護(hù);2000年08期

5 王華;鄧軍;王連華;葛嶺梅;王偉峰;;可燃性氣體爆炸研究現(xiàn)狀及發(fā)展方向[J];礦業(yè)安全與環(huán)保;2008年03期

6 張春燕;王貴成;裴宏杰;朱云明;曲海軍;;銑削毛刺的形成及其控制[J];工具技術(shù);2007年07期

7 張根元,王育烽;高溫氧化處理氣氛的熱力學(xué)分析與控制[J];河海大學(xué)學(xué)報(bào)(自然科學(xué)版);2001年01期

8 蔣懷青;;熱能去毛刺工藝[J];航空精密制造技術(shù);1991年03期

9 任延華,張研;航空機(jī)載設(shè)備精密件的去毛刺方法[J];航空精密制造技術(shù);2005年02期

10 沈曉安;;熱能去毛刺的實(shí)驗(yàn)研究[J];航空精密制造技術(shù);2010年04期

相關(guān)博士學(xué)位論文 前1條

1 王志榮;受限空間氣體爆炸傳播及其動(dòng)力學(xué)過程研究[D];南京工業(yè)大學(xué);2005年

相關(guān)碩士學(xué)位論文 前3條

1 汪泉;管道中甲烷—空氣預(yù)混氣爆炸火焰?zhèn)鞑サ难芯縖D];安徽理工大學(xué);2006年

2 楊玉銘;瓦斯氣體爆炸過程的仿真模擬[D];中北大學(xué);2008年

3 陳蘭蘭;電化學(xué)去毛刺的建模與實(shí)驗(yàn)研究[D];大連理工大學(xué);2009年

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