钢丝缠绕剖分式扁挤压筒及其有限元分析

Steel Wire Winding Split Flat Extrusion Cylinder and Its Finite Element Analysis

针对多层扁挤压筒结构圆弧过渡处容易出现应力集中及存在的制造装配困难等问题,提出了预应力钢丝缠绕剖分式扁挤压筒结构,并根据未裂先分原理将扁挤压筒内层沿长轴进行剖分,进而改变扁挤压筒内层的受力状态。通过有限元方法对整体式和剖分式预应力钢丝缠绕扁挤压筒进行对比分析,结果表明:内层扁挤压筒经过剖分后,其内壁圆弧过渡处的应力峰值显著下降,内壁应力分布更加均匀;剖分后的扁挤压筒抗挤压能力上升,内层疲劳破坏风险下降,使用寿命提高。

In order to solve the problems of stress concentration and assembly difficulty in the arc transition of multi-layer flat extrusion tube structure, a new type of flat extrusion tube structure with pre-stressed steel wire winding and splitting is proposed. According to the principle of splitting before cracking, the inner layer of flat extrusion tube is divided along the long axis, and then the stress state of the inner layer of flat extrusion tube is changed. The finite element method is used to com-pare and analyze the integral and split prestressed steel wire winding flat extrusion cylinder. The results show that the stress peak value of the inner flat extrusion cylinder at the arc transition of the inner wall decreases significantly after the inner flat extrusion cylinder is dissected, and the stress distribution of the inner wall is more uniform;the anti extrusion ability of the split flat extru-sion cylinder increases, the risk of inner fatigue failure decreases, and the service life increases.