轧制差厚板横向弯曲工艺参数研究

以U型件为对象，研究分析了差厚板的横向弯曲成形性能与特点，探讨弯曲回弹以及过渡区移动等缺陷的发生机理.在此基础上，重点讨论工艺参数对差厚板回弹和过渡区移动的影响规律.结果表明，差厚板的回弹随着压边力的增大逐渐减小，这种趋势对于未退火差厚板尤为显著，随摩擦系数的增大而呈现先减小后增大的趋势，随模具间隙的增大而增大;过渡区移动量则随压边力的增大先递减而后递增，随着摩擦系数的增大而逐渐减小，而受模具间隙的影响较小.采用(1~4)t的压边力、0.12左右的摩擦系数以及2.2~2.4mm的模具间隙对于控制回弹以及过渡区移动量是非常有利的.

Study on Process Parameters in Transverse Bending of Tailor Rolled Blanks

The forming properties and characteristics of tailor rolled blanks(TRB)in transverse bending process were studied by taking U-channel as the research object. The mechanisms of forming defects， including bending springback and thickness transition zone(TTZ)movement etc.， were discussed. On this basis， the special emphasis was put on the effects of process parameters on springback and TTZ movement. Results indicated that the springback of TRB decreases with the increase of blank holder force(BHF)， and this trend is especially prominent for unannealed TRB. Springback decreases first and then increases with the increase of friction coefficient， and increases with the increase of die clearance. TTZ movement decreases first and then increases with the increase of BHF， decreases with the increase of friction coefficient， and it is almost not affected by die clearance. Overall， BHF of (1~4)t， friction coefficient of around 0.12 and die clearance of 2.2~2.4mm are advantageous in controlling springback and TTZ movement.