共查询到18条相似文献,搜索用时 234 毫秒
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这种切分刀,结构简单、重量轻、不用特殊动力,靠轧件出辊时的推力切分。切分后,经若干道次轧制出成品。成品规格为Φ6~20mm圆钢及螺纹钢、线材等。切分刀的布置如图1所示。切分刀结构及外形尺寸见图2。 相似文献
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为保证大变形弹塑性分析的稳定性,采用随材料变形的拉格朗日物质形函数分析了整个切分轧制过程。在整个变形过程中,物质核函数的影响域包含相同的节点数,通过坐标转换方法满足本质边界条件。求解了切分轧制极端变形过程,研究了不同切分楔夹角和轧件宽度对切分后轧件弯曲度的影响,数值模拟结果与实验数据吻合良好。 相似文献
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切分轧制的实验研究:预切分孔中金属的变形 总被引:1,自引:1,他引:0
针对辊切法中斜配孔型轧制进行了一定的实验研究,较详细地介绍了切分孔型设计、斜配角度、坯料选择、切分轧制时的金属变形和切分轧件质量及控制等一系列问题。 相似文献
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采用辊切轧制提高轧机吃坯能力 总被引:1,自引:1,他引:1
为了解决小轧机如何使用大连铸坯的问题,本文提出用辊切轧制的方法。并从轧件受力和不均匀变表两方面分析了辊切变形的机理;讨论了辊切轧制的孔型设计方法、配辊方法和导卫设计方法;分析了采用辊切轧制方法后可能带来的经济效益。 相似文献
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Rod rolling is a process in which the deformation of the workpiece between the work rolls is quite different from the rod
drawing process, but the area strains (natural logarithm of area reduction ratio) multiplied by a constant have been used
in the calculation of the pass-by-pass evolution of austenite grain size in rod (or bar) rolling without any verification.
Considering that the deformation parameters (strain and strain rate) at a given pass play a crucial role in determining recrystallization
behavior, the calculation method for the deformation parameters associated with rod rolling should be examined. In this study,
a series of numerical simulations has been carried out using an area strain model [5] and an analytic model [6] which calculate
the pass-by-pass strain in the rod rolling process, focusing on the effect of the calculation method for the pass-by-pass
strain on the recrystallization behavior and evolution of AGS (austenite grain size) during a given pass. These have been
investigated for a six-pass rolling sequence (oval-round or round-oval) designed for this study by incorporating the recrystallization
and AGS evolution model being widely used in hot rolling. It was found that the recrystallization behavior and evolution of
AGS during a given pass were significantly influenced by the calculation methods for deformation parameters. The area strain
model lacks mathematical grounds to be used as input to the equations for recrystallization and AGS evolution. 相似文献
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铜包铝复合棒材平辊轧制宽展变形行为 总被引:2,自引:0,他引:2
对铜包铝复合棒材平辊冷轧时的金属流动进行数值模拟和实验研究.结果表明:由圆断面至扁断面的第一道次平辊轧制中侧边以变形宽展为主;在后续道次的平辊轧制过程中,滑动宽展的影响增大,侧边变形宽展的影响减小;当压下率为13.3%~26.7%时,摩擦因数对铜包铝棒材宽展率的影响较小,而当压下率大于33.3%时,摩擦因数对宽展的影响增大;铜包铝复合棒材的最大轧制压力在轧制入口端,断面上存在一条"X"状的等效应变带.实验结果与有限元分析结果具有良好的一致性.采用合适的轧制工艺,可获得铜包覆层分布均匀、铜铝复合界面无裂纹和分层、表面质量好的扁排. 相似文献
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《Acta Materialia》2001,49(13):2583-2595
Asymmetric rolling, in which the circumferential velocities of working rolls are different, imposes shear deformation and in turn shear deformation textures to sheets through the thickness. A component of ND//〈111〉 in the shear deformation textures can improve the plastic strain ratios of aluminum sheets. In order to understand the evolution of ND//〈111〉, the strain histories and distributions in the sheets and the texture evolution during the asymmetric rolling have been measured and calculated. The shear deformation texture can vary with the ratio of shear to normal strain increments. As the ratio increases from zero to infinity, the texture moves from the plane strain compression texture (β fiber) to the ideal shear deformation texture consisting of {001}〈110〉, {111}〈110〉, and {111}〈112〉. The ratio increases with rolling reduction per pass in asymmetric rolling. However, it is practically difficult to develop a rolling reduction per pass high enough to obtain the ideal shear deformation texture. Imposing the positive and negative shear deformations on the sheet by reversal of the shearing direction can give rise to the ideal shear deformation texture. 相似文献
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通过单道次轧制试验,研究了AZ31B挤压镁合金板材在温度为365℃和450℃时的轧制性能,其变形量范围为10%~60%,应变速率为2.1s-1~5.0s-1。通过光学显微镜和扫描电镜观察了轧制变形中的微观组织及其演变。结果表明,在变形的初始阶段,孪生为主要的变形机理和硬化机制。由孪生变形积聚的畸变能和非基滑移的启动,导致了动态再结晶的形核与长大,增大变形速率可以抑制晶粒长大,使平均晶粒尺寸细化到7μm~10μm。365℃温轧制变形使板材晶粒明显细化,温度较高时,晶粒细化作用有限。在同一变形量下,随着轧制温度的升高,板材的晶粒呈长大趋势,在365℃轧制温度下,随着道次变形量的加大,细晶百分含量随之迅速增加。当轧制温度提高到450℃时,晶粒细化有限,晶粒尺寸保持在20μm以上。 相似文献
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试验研究了1235铝合金铸轧坯料的晶粒破碎程度及不同均匀化退火温度对坯料的组织、性能及箔材成品针孔数量的影响.通过金相分析和试验结果得出,合适的第一道次冷轧加工率和均匀化退火温度有利于减少铝箔成品的针孑L数量及箔轧时的断带次数. 相似文献
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研究表明,随着ELC—BH钢板终轧变形量和终轧变形速度增加以及终轧温度降低,A_(r3)升高,这些规律归因于高温变形期间加工硬化和热激活软化两种因素竞争引起的微观组织结构的变化。 相似文献