【摘要】：基于Simufact建立了大型截面鎳基合金異形環(huán)件熱輾擴成形(環(huán)軋)過程的熱-力耦合三維有限元模型,模擬計算并揭示了摩擦因子、主輥線速度、芯輥進給速度、芯輥直徑等工藝條件對環(huán)件環(huán)軋過程中的等效應(yīng)變、軋制力、環(huán)件尺寸等的影響規(guī)律,用于指導(dǎo)實際環(huán)軋生產(chǎn)中的工藝參數(shù)設(shè)定和優(yōu)化。結(jié)果表明:(1)主輥(驅(qū)動輥)摩擦因子與錐輥摩擦因子的增加均有利于外徑的增加,而芯輥摩擦因子的增加則有利于內(nèi)徑的增加;主輥摩擦因子的增加會同時增加環(huán)件的徑向與軸向軋制力;主輥摩擦因子的增加可以使環(huán)件內(nèi)外表面等效應(yīng)變更均勻,使變形更均勻,可以在一定程度上使塑性區(qū)更容易穿透環(huán)件壁厚。(2)隨著芯輥的進給速度增大,芯輥每轉(zhuǎn)進給量增加,使塑性區(qū)更容易穿透壁厚,從而使變形更均勻;環(huán)件每次通過徑向孔型時變形區(qū)面積增大,更多的金屬發(fā)生塑性變形,徑向軋制力增加;變形區(qū)增大使環(huán)件內(nèi)外徑變小;但芯輥進給速度過大則會使局部變形過大,易使橢圓度增加,導(dǎo)致環(huán)件畸形。(3)隨著主輥線速度的增加,環(huán)坯的變形更多集中在環(huán)件的表面區(qū)域,從而使環(huán)件表面處的等效應(yīng)變比中間部分增加的更為明顯;環(huán)件每次通過徑向與軸向孔型時變形區(qū)面積減小,金屬塑性變形區(qū)減小,軋制力減小;由于環(huán)件的內(nèi)外側(cè)更容易變形,所以內(nèi)外徑最終值隨著主輥線速度的增加有增大的趨勢。(4)隨著芯輥直徑的增大,在徑向孔型中,會導(dǎo)致金屬在環(huán)件內(nèi)表面流動的阻力增大,從而使環(huán)件內(nèi)表面等效應(yīng)變減小,而在軸向方向上,上下表面等效應(yīng)變并沒有明顯變化;芯輥與環(huán)件內(nèi)表面接觸面積變大,使更多金屬發(fā)生塑性變形,使徑向軋制力逐漸增大,而軸向軋制力的變化趨勢并無明顯變化;在環(huán)件尺寸方面,芯輥直徑的變化對環(huán)件尺寸的影響并不明顯。(5)對于本文研究的φ1500mm(外徑)×φ860mm(內(nèi)徑)×350mm(厚度)大型異形截面鎳基合金環(huán)件,為了得到形狀、尺寸合適,變形均勻的產(chǎn)品,且在環(huán)軋過程中不易出現(xiàn)缺陷,通過有限元模擬得出的較為合理的環(huán)軋工藝為:主輥線速度為1100mm/s,芯輥進給速度為1.5~1mm/s,主輥、芯輥、錐輥摩擦因子分別為0.7、0.7、0.4,芯輥直徑為280mm。
[Abstract]:Based on Simufact, the thermo-mechanical coupling three-dimensional finite element model for the hot rolling forming (ring rolling) process of large section nickel-base alloy special-shaped ring is established. The friction factor, the linear velocity of the main roll and the feed speed of the core roll are simulated and calculated. The influence of core roll diameter on the equivalent strain, rolling force and ring size during ring rolling is used to guide the setting and optimization of process parameters in practical ring rolling. The results show that: (1) the increase of friction factor of main roll (drive roll) and cone roll is favorable to the increase of outer diameter, while the increase of friction factor of core roll is favorable to the increase of inner diameter; The increase of friction factor of the main roll will increase the radial and axial rolling force of the ring at the same time. The increase of friction factor of the main roll can make the inner and outer surface effects of the ring uniform, make the deformation more uniform, and make the plastic zone more easily penetrate through the wall thickness of the ring to some extent. (2) with the increase of the feed speed of the core roller, With the increase of the feed rate of the core roll, the plastic zone is easier to penetrate the wall thickness and the deformation is more uniform. When the ring passes through the radial pass, the area of the deformation zone increases, more metals occur plastic deformation, and the radial rolling force increases, and the inner and outer diameter of the ring becomes smaller with the increase of the deformation zone. However, if the feed speed of the core roll is too large, the deformation of the ring will be too large, and the ellipticity will increase easily, which will lead to the deformity of the ring. (3) with the increase of the linear velocity of the main roll, the deformation of the ring billet is more concentrated in the surface area of the ring. The equivalent strain at the surface of the ring is more obvious than that at the middle part. The deformation zone area decreases, the plastic deformation zone decreases and the rolling force decreases when the ring passes through radial and axial pass. Because the inner and outer sides of the ring are more easily deformed, the final value of the inner and outer diameter increases with the increase of the linear velocity of the main roll. (4) with the increase of the diameter of the core-roller, the final value of the inner and outer diameter increases in the radial pass. The resistance of metal flow on the inner surface of the ring will increase, and the equivalent strain on the inner surface of the ring will decrease, but in the axial direction, the equivalent strain on the upper and lower surface will not change obviously. The inner surface contact area between core-roller and ring increases, making more metals plastic deformation and increasing radial rolling force, but the change trend of axial rolling force is not obvious. In the aspect of ring size, the influence of core-roller diameter on ring size is not obvious. (5) for 蠁 1500mm (outer diameter) 脳 蠁 860mm (internal diameter) 脳 350mm (thickness) large special-section nickel-based alloy ring, in order to obtain shape, The products with suitable size and uniform deformation are not easy to appear defects in the process of ring rolling. The reasonable ring rolling process obtained by finite element simulation is as follows: linear speed of main roll is 1100mm / s, feed speed of core roll is 1.5mm / s, main roll, core roll, main roll, core roll, The friction factor of cone roller is 0.7 ~ 0.7m ~ (0.4), and the diameter of core roller is 280 mm 路m ~ (-1).
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG339

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