An upper bound solution of axial metal flow in cold radial forging process of rods

作者：Wu, Yunjian; Dong, Xianghuai^*; Yu, Qiong

来源：International Journal of Mechanical Sciences, 2014, 85: 120-129.

DOI：10.1016/j.ijmecsci.2014.05.019

• Radial forging
• Axial metal flow
• Upper bound method
• Kinematically admissible velocity field

In process design of radial forging, the prediction of axial metal flow, which has an effect on the forging efficiency, is very important. In this paper, based on a kinematically admissible velocity field, an axisymmetric model of radial forging of rods by an upper bound method (UBM) is proposed. Because the deforming process in a stroke is non-steady, it is divided into finite small steps so that the deformation in a step can be assumed as homogeneous steady flow. In addition, front-pull and back-push forces are taken into account. The amounts of metal flowing forward and backward can be predicted reasonably. The UBM model is validated by comparing the predicted forging load with published experimental data, and by comparing the predicted neutral plane position and axial metal flow with that of finite element simulation. Then the influences of friction factor, axial feed per stroke, reduction in cross-section area, inlet angle of hammer, front-pull and back-push forces on the percentage of forward material flow are investigated.

• 出版日期2014-8
• 单位上海交通大学