6061鋁合金累積不均勻變形工藝研究
發(fā)布時(shí)間：2018-09-13 14:41
【摘要】：6061鋁合金具備輕質(zhì)、高強(qiáng)、耐腐蝕等優(yōu)良特性,以其制備的精密零件在設(shè)備制造、汽車、家居等行業(yè)都受到廣泛應(yīng)用。6061鋁合金具備良好的成型性能,與之相關(guān)的軋制技術(shù)發(fā)展十分迅速,軋制生產(chǎn)過(guò)程的自動(dòng)化、精密化勢(shì)必會(huì)成為未來(lái)的發(fā)展趨勢(shì)。本課題采用異步軋制(Asymmetric Rolling,ASR)和反復(fù)彎曲平直軋制(Repetitive Corrugation and straightening,RCS)分別對(duì)6061鋁合金進(jìn)行多道次累積不均勻變形加工,并對(duì)兩種軋制工藝進(jìn)行對(duì)比分析。采用ANSYS/LS-DYNA有限元模擬分析軟件,模擬了道次壓下率為8%和20%的彎曲變形過(guò)程。壓下率為8%時(shí),軋后殘余應(yīng)力主要集中在發(fā)生彎曲變形位置的板材心部,在材料頭部和尾部殘余應(yīng)力較小,軋件與軋輥波峰接觸位置金屬流動(dòng)較快,軋后板材變形較為均勻,適用于連續(xù)生產(chǎn)。道次壓下率為20%時(shí),軋件寬度方向存在較大起伏,不能用于連續(xù)生產(chǎn)。分別采用異步軋制和反復(fù)彎曲平直軋制對(duì)軋件進(jìn)行加工,其中異步軋制采用1.14、1.26、1.39三組異速比,反復(fù)彎曲平直軋制齒型采用半徑為18mm和26mm的三段圓弧相切得到�？倝合侣蕿�30%時(shí),三組異速比(1.14,1.26,1.39)軋制后得到的平均晶粒尺寸為97.8μm、89.3μm、84.1μm,反復(fù)彎曲平直軋制軋后晶粒尺寸為79.4μm,在晶界附近存在破碎的小晶粒。隨著壓下量的增加,三組異速比的軋后晶粒得到不同程度的細(xì)化,晶粒被進(jìn)一步拉長(zhǎng),沒(méi)有觀察到新的晶粒生成。對(duì)總壓下率30%的軋后試樣進(jìn)行單向拉伸試驗(yàn),反復(fù)彎曲平直軋制相對(duì)于異步軋制得到的試樣抗拉強(qiáng)度較大,可以達(dá)到381MPa,屈服強(qiáng)度為374MPa,但是在強(qiáng)度提高的同時(shí)軋件的斷后延伸率相應(yīng)較低,僅為6.31%。隨著異速比的增加,軋件的抗拉強(qiáng)度和屈服強(qiáng)度也隨之增加,斷后延伸率變化較小。
[Abstract]:6061 aluminum alloy has many excellent properties, such as light weight, high strength, corrosion resistance and so on. It has been widely used in equipment manufacturing, automobile, home and other industries. The related rolling technology is developing very quickly. The automation and precision of rolling process will be the trend in the future. In this paper, asynchronous rolling (Asymmetric Rolling,ASR) and repeated bending flat rolling (Repetitive Corrugation and straightening,RCS) are used to process 6061 aluminum alloy for multiple pass cumulative inhomogeneous deformation, and the two rolling processes are compared and analyzed. The bending deformation process with 8% and 20% pass reduction rate was simulated by ANSYS/LS-DYNA finite element simulation software. When the reduction rate is 8, the residual stress after rolling is mainly concentrated in the center of the plate where bending deformation occurs. The residual stress at the head and tail of the material is smaller, the metal flow is faster at the position of contact between the workpiece and the wave peak of the roll, and the deformation of the plate after rolling is more uniform. Suitable for continuous production. When the pass reduction rate is 20, the width direction of the rolling piece fluctuates greatly and can not be used in continuous production. The rolling parts were processed by asynchronous rolling and repeated bending straight rolling respectively. Among them, 1.14U 1.261.39 groups of different speed ratios were used for asynchronous rolling, and the tooth profile for repeated bending straight rolling was obtained by tri-section arc tangent with radius of 18mm and 26mm. When the total reduction rate is 30, the average grain size of the three groups of different speed ratio (1.141.26 / 1.39) after rolling is 97.8 渭 m, 89.3 渭 m and 84.1 渭 m respectively, and the grain size is 79.4 渭 m after repeated bending flat rolling. There are small broken grains near the grain boundary. With the increase of the reduction amount, the three groups of different speed ratio grains were refined to different extent, the grains were further elongated, and no new grain formation was observed. The tensile strength of the specimens after rolling with a total reduction rate of 30% was tested by uniaxial tensile test. The tensile strength of the specimens obtained by repeated bending flat-straight rolling was higher than that obtained by asynchronous rolling. The yield strength and yield strength can reach 381MPa and 374MPa respectively, but the elongation at break of the rolled piece is relatively low at the same time, which is 6.31 MPA. The tensile strength and yield strength of workpiece increase with the increase of the ratio of different speed, and the elongation after break changes little.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG339
[Abstract]:6061 aluminum alloy has many excellent properties, such as light weight, high strength, corrosion resistance and so on. It has been widely used in equipment manufacturing, automobile, home and other industries. The related rolling technology is developing very quickly. The automation and precision of rolling process will be the trend in the future. In this paper, asynchronous rolling (Asymmetric Rolling,ASR) and repeated bending flat rolling (Repetitive Corrugation and straightening,RCS) are used to process 6061 aluminum alloy for multiple pass cumulative inhomogeneous deformation, and the two rolling processes are compared and analyzed. The bending deformation process with 8% and 20% pass reduction rate was simulated by ANSYS/LS-DYNA finite element simulation software. When the reduction rate is 8, the residual stress after rolling is mainly concentrated in the center of the plate where bending deformation occurs. The residual stress at the head and tail of the material is smaller, the metal flow is faster at the position of contact between the workpiece and the wave peak of the roll, and the deformation of the plate after rolling is more uniform. Suitable for continuous production. When the pass reduction rate is 20, the width direction of the rolling piece fluctuates greatly and can not be used in continuous production. The rolling parts were processed by asynchronous rolling and repeated bending straight rolling respectively. Among them, 1.14U 1.261.39 groups of different speed ratios were used for asynchronous rolling, and the tooth profile for repeated bending straight rolling was obtained by tri-section arc tangent with radius of 18mm and 26mm. When the total reduction rate is 30, the average grain size of the three groups of different speed ratio (1.141.26 / 1.39) after rolling is 97.8 渭 m, 89.3 渭 m and 84.1 渭 m respectively, and the grain size is 79.4 渭 m after repeated bending flat rolling. There are small broken grains near the grain boundary. With the increase of the reduction amount, the three groups of different speed ratio grains were refined to different extent, the grains were further elongated, and no new grain formation was observed. The tensile strength of the specimens after rolling with a total reduction rate of 30% was tested by uniaxial tensile test. The tensile strength of the specimens obtained by repeated bending flat-straight rolling was higher than that obtained by asynchronous rolling. The yield strength and yield strength can reach 381MPa and 374MPa respectively, but the elongation at break of the rolled piece is relatively low at the same time, which is 6.31 MPA. The tensile strength and yield strength of workpiece increase with the increase of the ratio of different speed, and the elongation after break changes little.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG339
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