热斜轧不锈钢棒下料断口成形的研究  

Study on fracture deformation during cropping stainless steel bar by hot skew rolling

作　　者：黄欢欢[1] 刘晋平[2] 胡正寰[2] 

机构地区：[1]北京航空材料研究院高温材料研究所,北京100094 [2]北京科技大学机械工程学院零件轧制中心,北京100083

出　　处：《锻压技术》2014年第8期99-104,共6页Forging & Stamping Technology

基　　金：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)

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 fi^rming process the metal flow and deformation of rolled piece in the cropped fracture section is fierce, and the de- f^rmation 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 an- gle 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 de- pression 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 difficuh because of the serious depres- sion on the cropped fracture section.

关 键 词：热斜轧 不锈钢棒 断口成形 锥角 

分 类 号：TG335.62[金属学及工艺—金属压力加工]