无论是平砧拔长还是新fm锻造法，都要对料宽比加以控制，才能实现横向无拉应力锻造。
Only when the blank width ratio is confined, can no crosswise tension stress forging be realized, regardless of flat platen stretching or the new FM forging method.
建立了圆坯拔长锻造的运动许可速度场与应变速率场。
The kinematically admissible velocity field and strain rate field for extension forging of rounds have been established.
此文用塑性泥作模拟材料，进行了压扭复合锻造和不对称V型砧拔长的工艺实验。
The experiments of twist-compression forging and unsymmetrical V-shape die forging are made using plasticine.
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