| 引用本文: | 胡鹏科,王英,张歆研,汪锐,束学道.球面端坯料热滚切成形仿真及机理分析[J].材料科学与工艺,2021,29(2):64-71.DOI:10.11951/j.issn.1005-0299.20200353. |
| HU Pengke,WANG Ying,ZHANG Xinyan,WANG Rui,SHU Xuedao.Simulation and mechanism analysis of heat roll-cutting forming method of spherical end blank[J].Materials Science and Technology,2021,29(2):64-71.DOI:10.11951/j.issn.1005-0299.20200353. |
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| 摘要: |
| 坯料端部预加工成球面状是改善楔横轧件凹心缺陷的有效方法。为了避免传统机加工制坯带来的材料损失,本文提出了一种基于金属塑性成形的球面端部热滚切成形方法。建立了球面端坯料热滚切成形的有限元模型,通过仿真分析了成形过程中滚切区金属的位移场变化规律和应变场分布特征,阐述了球面端坯料的成形机理以及在挡块作用下堆料的抑制机理,并对所得球面端坯料进行了楔横轧仿真。研究表明,球面端坯料热滚切成形是棒料滚切区金属在刀具作用下发生径向压缩、切向扩张和轴向延伸,最终断裂并获得球面端部的过程；堆料的产生是滚切区表层金属轴向流动不及时导致的,挡块的滚压作用能够促使堆料沿轴向排开,改善端部质量；热滚切所得球面端坯料具有与理想球面端坯料相近且良好的凹心抑制效果,可为实现无料头轧制提供思路和理论支持。 |
| 关键词: 楔横轧 凹心 滚切 球面端 堆料 |
| DOI：10.11951/j.issn.1005-0299.20200353 |
| 分类号:TG335.19 |
| 文献标识码:A |
| 基金项目:浙江省自然科学基金资助项目(LY19E050001)；国家自然科学基金资助项目(51975301)；宁波市“科技创新2025”重大专项资助项目(2020Z110). |
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| Simulation and mechanism analysis of heat roll-cutting forming method of spherical end blank |
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HU Pengke, WANG Ying, ZHANG Xinyan, WANG Rui, SHU Xuedao
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(Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China)
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| Abstract: |
| Blank end preprocessed into spherical end is an effective method to improve the concave defects of cross wedge rolling. In order to avoid material loss from common method, a heat roll-cutting forming method of spherical end blank based on metal-plastic forming was proposed. The finite element model of heat roll-cutting forming of spherical end blank was established. The variation law of displacement field and the distribution characteristics of strain field of metal in the roll-cutting region were analyzed through simulation. The heat roll-cutting forming mechanism of the spherical end and the stacking inhibition mechanism under the action of blocks were expounded, and the simulation of cross wedge rolling of the spherical end blank was carried out. The study showed the heat roll-cutting forming of spherical end blank was a process where the metal in the roll-cutting region generated radial compression, tangential expansion and axial extension under the action of cutting tools, and finally fractured and the spherical end was obtained. The stacking was caused by the late axial flow of the surface metal in the roll-cutting region. The rolling of blocks could promote the stacking to be removed along the axial direction and improve the end quality. The spherical end blank obtained by heat roll-cutting had similar and good concavity-inhibiting effect with the ideal spherical end blank. It provides the idea and theoretical support for the realization of cross wedge rolling without the stub bar. |
| Key words: cross wedge rolling concavity roll-cutting spherical end stacking metal |
