锻压技术

热斜轧不锈钢棒下料断口成形的研究

英文标题：Study on fracture deformation during cropping stainless steel bar by hot skew rolling

作者：黄欢欢刘晋平胡正寰

关键词：热斜轧不锈钢棒断口成形锥角

分类号：TG335.19

出版年,卷(期):页码：2014,39(8):99-104

摘要：

热斜轧下料技术是结合斜轧工艺而提出的一种可用于不锈钢棒下料生产的新方法，下料过程中断口处金属流动变形程度比较大，下料断口的成形效果直接影响着不锈钢棒下料的质量。通过对热斜轧不锈钢棒下料成形过程进行有限元模拟仿真和轧制实验，研究了下料断口和端面锥角的成形过程。研究表明，断口处金属流动变形是从外向内逐层开始的，连接颈中心会产生较大的拉应力和拉应变；下料断口端面锥角设计值越小，轧件端面成形凹陷越明显，锥角成形越困难。锥角设计值为5°时，总体成形情况基本满足设计要求。当锥角更小时，断口端面凹陷严重，成形困难。

Hot skew rolling is a new and advanced method which can be used for cropping stainless steel bar based on the technology of skew rolling. In the forming process the metal flow and deformation of rolled piece in the cropped fracture section is fierce, and the deformation of cropped fracture has a direct and important influence on the quality of cropped stainless steel bar. By studying the forming process of cropping stainless bar with the method of FEM and rolling experiments, the forming processes of cropping fracture and cone angle on the end surface of fracture section were analyzed. The results show that the metal flow and deformation of cropping fracture section start from inside to outside layer-by-layer, and bigger tensile stress and strain appear in the center of connected part. In the meantime the smaller the cone angle on the end surface of cropped fracture section is, the more difficult its forming is, and the more obvious the depression on the cropped fracture section is. When the cone angle designed is 5°, the overall deformation of it is basically complied with the design requirements. When the cone angle is smaller than 5°, the deformation of it is obviously difficult because of the serious depression on the cropped fracture section.

基金项目：

国家自然科学基金资助项目（50435010,50675019）；国家科技支撑计划资助项目（2006BAF04B03）

黄欢欢（1985-），男，硕士，助理工程师

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