珠光体钢丝冷拉大变形应变路径研究
发布时间：2019-01-05 06:33
【摘要】：随着汽车和轮胎轻量化的发展趋势,钢帘线需要发展高强度的冷拔钢丝;硅片和蓝宝石晶片切割为减少锯缝和材料损失,也迫切要求发展高强度的细钢丝。然而,通过增加塑性应变量提高钢丝力学性能的方法到达了瓶颈,急需寻找其他的有效途径。本文利用Abaqus有限元分析软件对钢丝多道次拉拔过程进行模拟仿真运算,并进行了多道次拉拔钢丝的力学性能实验,旨在明确冷拉大变形过程中应变路径的规律,以获得基于应变路径的组织演变和力学性能的理论基础,为通过应变路径控制组织演变开发高强度的钢丝提供一条新思路和新方法。文中首先讨论了应变路径的概念和表征方法,确定了以偏应力张量施密特因子表征应变路径演变的方法。然后针对珠光体钢丝多道次冷拉拔的生产工艺,结合有限元软件的特点,运用场变量传递和网格重划分的技术,实现了对珠光体钢丝多道次拉拔应变路径全纪录有限元模型的建立。并针对拉拔大变形以及钢丝表层到心部力学性能不均匀的问题,基于实验构建和修正了大变形量材料模型。对珠光体钢丝进行多道次拉拔模拟。发现钢丝多道次拉拔过程中,各道次在心部到表层方向上的等效应变分布规律相同,且钢丝心部等效应变值最小,次表层处等效应变值最大。23道次拉拔结束后,钢丝的最大应变值可达到4.360。计算了拉拔过程中的应变路径。结果表明不同位置处的材料经历了不同的应变路径变化:心部和表面材料的应变路径基本保持不变,其余部分在进入定径带前经历了较大的应变路径变化,其中次表层材料经历的应变路径变化程度最大。研究了工艺参数对应变路径变化的影响,发现随着模角增大,材料所经历的应变路径变化程度随之增加;而随着压缩率的增加,材料的应变路径变化程度减小。测试了冷拉拔珠光体钢丝不同半径处的屈服强度。由于钢丝在拉拔过程中经历了不同的应变路径,因此钢丝的屈服强度在半径方向上分布不均匀:表层的屈服强度最高;随着半径的减小,屈服强度先降低后升高;在相对半径0.8处,屈服强度又逐渐下降。
[Abstract]:With the development of lightweight automobile and tire, steel cord needs to develop high strength cold drawn steel wire, silicon chip and sapphire chip cut in order to reduce saw seam and material loss, it is urgent to develop high strength fine steel wire. However, the method of improving the mechanical properties of steel wire by increasing plastic strain has reached the bottleneck, so it is urgent to find other effective ways. In this paper, Abaqus finite element analysis software is used to simulate and simulate the drawing process of multi-pass steel wire, and the experiment of mechanical properties of multi-pass drawing steel wire is carried out in order to clarify the rule of strain path in the process of cold drawing and large deformation. In order to obtain the theoretical basis of microstructure evolution and mechanical properties based on strain path, a new idea and method are provided for developing high strength steel wire by strain path control. In this paper, the concept and characterization method of strain path are discussed, and the method of characterizing strain path evolution by using Zhang Liang Schmitt factor of deviant stress is determined. Then according to the production technology of multi-pass cold drawing of pearlite steel wire, combined with the characteristics of finite element software, the technology of field variable transfer and grid re-division is used. The finite element model of multi-pass drawing strain path of pearlite wire is established. Aiming at the problems of large deformation in drawing and uneven mechanical properties from the surface to the center of steel wire, the material model of large deformation is constructed and modified based on experiments. The multi-pass drawing simulation of pearlite wire was carried out. It is found that in the process of multi-pass drawing of steel wire, the distribution of equivalent strain is the same in the direction from the center to the surface of the wire, and the equivalent strain at the center of the wire is the smallest, and the equivalent strain at the subsurface is the largest. After 23 times of drawing, the equivalent strain is the same. The maximum strain value of steel wire can reach 4.360. The strain paths during drawing are calculated. The results show that the materials at different positions undergo different strain path changes: the strain paths of the core and surface materials remain basically unchanged, and the rest of the materials undergo great strain path changes before entering the diametric zone. The change of strain path of subsurface material is the biggest. The influence of process parameters on the strain path change is studied. It is found that the strain path change degree increases with the increase of die angle, but decreases with the increase of compressibility. The yield strength of cold drawn pearlite wire at different radius was tested. Due to the different strain paths during drawing, the yield strength of the steel wire is not uniform in the radius direction: the yield strength of the surface layer is the highest, and the yield strength decreases first and then increases with the decrease of the radius. At the relative radius of 0.8, the yield strength decreases gradually.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG356.46
[Abstract]:With the development of lightweight automobile and tire, steel cord needs to develop high strength cold drawn steel wire, silicon chip and sapphire chip cut in order to reduce saw seam and material loss, it is urgent to develop high strength fine steel wire. However, the method of improving the mechanical properties of steel wire by increasing plastic strain has reached the bottleneck, so it is urgent to find other effective ways. In this paper, Abaqus finite element analysis software is used to simulate and simulate the drawing process of multi-pass steel wire, and the experiment of mechanical properties of multi-pass drawing steel wire is carried out in order to clarify the rule of strain path in the process of cold drawing and large deformation. In order to obtain the theoretical basis of microstructure evolution and mechanical properties based on strain path, a new idea and method are provided for developing high strength steel wire by strain path control. In this paper, the concept and characterization method of strain path are discussed, and the method of characterizing strain path evolution by using Zhang Liang Schmitt factor of deviant stress is determined. Then according to the production technology of multi-pass cold drawing of pearlite steel wire, combined with the characteristics of finite element software, the technology of field variable transfer and grid re-division is used. The finite element model of multi-pass drawing strain path of pearlite wire is established. Aiming at the problems of large deformation in drawing and uneven mechanical properties from the surface to the center of steel wire, the material model of large deformation is constructed and modified based on experiments. The multi-pass drawing simulation of pearlite wire was carried out. It is found that in the process of multi-pass drawing of steel wire, the distribution of equivalent strain is the same in the direction from the center to the surface of the wire, and the equivalent strain at the center of the wire is the smallest, and the equivalent strain at the subsurface is the largest. After 23 times of drawing, the equivalent strain is the same. The maximum strain value of steel wire can reach 4.360. The strain paths during drawing are calculated. The results show that the materials at different positions undergo different strain path changes: the strain paths of the core and surface materials remain basically unchanged, and the rest of the materials undergo great strain path changes before entering the diametric zone. The change of strain path of subsurface material is the biggest. The influence of process parameters on the strain path change is studied. It is found that the strain path change degree increases with the increase of die angle, but decreases with the increase of compressibility. The yield strength of cold drawn pearlite wire at different radius was tested. Due to the different strain paths during drawing, the yield strength of the steel wire is not uniform in the radius direction: the yield strength of the surface layer is the highest, and the yield strength decreases first and then increases with the decrease of the radius. At the relative radius of 0.8, the yield strength decreases gradually.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG356.46
【参考文献】
相关期刊论文 前10条
1 邱长贵;芮益斌;;硅片用切割钢丝生产及断线分析[J];金属制品;2013年05期
2 毛向阳;顾云翔;付洪波;蔡海斌;王章忠;赵秀明;;光伏晶硅切割用超细高强高碳钢丝的铅浴等温淬火工艺研究[J];材料导报;2013年18期
3 崔影;;光伏太阳能硅片切割用钢丝生产[J];金属制品;2013年02期
4 王宝玉;汪凯;宋为;王晋东;;胎圈钢丝的生产现状及节能环保[J];轮胎工业;2013年04期
5 杨子杨;;“十二五”智能制造装备产业发展思路[J];中国科技投资;2012年13期
6 黄宝;何立波;高真凤;邢娜;;亚洲帘线钢线材生产现状及发展趋势[J];金属制品;2011年06期
7 方峰;胡显军;王s，
本文编号：2401412
本文链接：https://www.wllwen.com/kejilunwen/jiagonggongyi/2401412.html
