多辊式止转筋机构方案设计与模拟分析

Scheme design and simulation analysis of multi roller standstill locking mechanism

为有效提高高强钢筋生产效率和矫直质量,基于楔钳作用机理,提出一种多点作用辊式止转筋机构:两侧多辊对称压下,中间三辊具有曲率微调功能,针对不同直径的高强钢筋,形成匹配的大变形曲率,并处于楔钳夹持状态,保证后续矫直过程的止转筋。基于ANSYS/LS-DYNA对止转筋机构工作过程进行有限元模拟,并对钢筋转动角度随时间变化图、接触应力状态及其变形图进行了探究阐释。结果表明:在保证高强钢筋表面接触强度的条件下,该机构能够实现高强钢筋矫直过程止转筋,从而可有效提高矫直精度。

In order to improve the production efficiency and straightening quality of high strength steel bars, a roller standstill locking mechanism with multipoint action was proposed based on wedge clamp mechanism, which adopted symmetrical multi roller in both ends and three rollers in the middle to realize fine-tuning of curvature. According to different diameter high strength steel bars, the matching large deformation curvature was formed. In the wedge clamp state, standstill locking of reinforcing steel bars in the subsequent straightening process was guaranteed. Based on ANSYS/LS-DYNA, the working process of standstill locking mechanism was simulated by FEM method. Rotation angle variation charts of bars, contact stress state as well as its distortion chart were explored. The results showed that the mechanism could realize standstill locking of high strength steel bars during straightening and improve straightening precision effectively under the condition of ensuring the surface contact strength of high strength steel bars.