| Popis: |
Based on the software of Deform-3D , the blooming process of H-beam has been simulated. The effect of different blooming temperature, different initial grain size and different rolling speed on residual stress was analyzed. According to the simulation from result , in the blooming process ,the residual stress of large sized H-Beam is mainly caused by uneven deformation. The big deformation exists in web. The flange deformation is only generated in the rolling surface. This uneven deformation leads to big residual stress in rolling piece. The residual stress of higher blooming temperature is much bigger than that of lower blooming temperature . Enlarging blank grain size has caused residual stress of web reduction, however, the whole residual stress will increase. Increasing the rolling speed of box-pass can significantly reduce the residual stress of R-joint and edges of flange. |
