本文關(guān)鍵詞： 霧化氣體淬火 數(shù)值模擬 熱應(yīng)力場 換熱系數(shù) 殘余應(yīng)力　出處：《昆明理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：霧化氣體冷卻技術(shù)早在很多年前就開始應(yīng)用于工業(yè)生產(chǎn),并取得一系列的突破和創(chuàng)新。霧化氣體淬火有足夠的淬火能力,保證了工件以大于臨界淬火冷卻速度冷卻,冷卻能力較好。同時,霧化氣體作為一種新型的淬火介質(zhì),具有可控性強(qiáng)、冷卻均勻以及無污染等特點,越來越受到人們的關(guān)注。但是,由于霧化氣體淬火起步較晚,目前還處于實驗探索階段。對于淬火設(shè)備的開發(fā)和淬火結(jié)果的測試都還具有一定的困難。本文通過計算機(jī)數(shù)值模擬和實驗結(jié)果相結(jié)合的研究方法,主要研究了霧化氣體淬火時的熱應(yīng)力場以及淬火冷卻后的殘余應(yīng)力。首先,根據(jù)熱彈塑性理論和相關(guān)理論對試件的增量型應(yīng)力-應(yīng)變關(guān)系進(jìn)行了分析,并研究了霧化氣體淬火熱應(yīng)力場的定解條件,淬火熱應(yīng)力場的非線性問題以及邊界條件的分析。然后運(yùn)用ANSYS有限元分析軟件建立了淬火的試件的數(shù)學(xué)模型和網(wǎng)格模型,將表面綜合換熱系數(shù)和氣體壓力代入邊界條件對淬火的熱應(yīng)力場進(jìn)行數(shù)值模擬計算,并對熱應(yīng)力場和殘余應(yīng)力進(jìn)行分析。最后,本文設(shè)計了鉆孔法測量殘余應(yīng)力的實驗,對霧化氣體淬火冷卻后試件的殘余應(yīng)力進(jìn)行測量并采集實驗數(shù)據(jù),將數(shù)值模擬計算結(jié)果和實驗數(shù)據(jù)進(jìn)行對比分析,對比結(jié)果表明本文對霧化氣體淬火時熱應(yīng)力場的數(shù)值模擬是有效的。
[Abstract]:Atomized gas cooling technology has been used in industrial production for many years, and has made a series of breakthroughs and innovations. Atomized gas quenching has sufficient quenching ability. At the same time, as a new quenching medium, atomization gas has the characteristics of strong controllability, uniform cooling and no pollution. More and more people pay attention to it. However, the atomization gas quenching starts late. At present, it is still in the stage of experimental exploration. There are still some difficulties for the development of quenching equipment and the testing of quenching results. This paper combines the computer numerical simulation with experimental results. The thermal stress field of atomized gas quenching and the residual stress after quenching and cooling are mainly studied. Firstly, the incremental stress-strain relationship is analyzed according to thermoelastic-plastic theory and related theory. The conditions for determining the thermal stress field of atomized gas quenching are also studied. The nonlinear problem of quenching thermal stress field and the analysis of boundary conditions are analyzed. Then the mathematical model and mesh model of quenched specimen are established by using ANSYS finite element analysis software. The surface comprehensive heat transfer coefficient and gas pressure are added to the boundary conditions to simulate the thermal stress field of quenching, and the thermal stress field and residual stress are analyzed. In this paper, the experiment of measuring residual stress by borehole method is designed. The residual stress of the sample after atomization gas quenching is measured and the experimental data are collected. The numerical simulation results are compared with the experimental data. The results show that the numerical simulation of thermal stress field in atomized gas quenching is effective.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG156.3

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本文編號：1460984