A general dynamically permissiblevelocity field for plane flow is set up in the paper. The force and energy parameters for extrusion (or drawing) are analyzed, and the optimum draw Angle is obtained.
本文建立了平面流动较为一般化的动可容速度场，分析了平面挤压(拉拔)的力能参数，获得了最佳凹模锥角。
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These data are analyzed and compared to stipulate sound particle velocity and permissible value of wall rock. The engineering blasting parameters and timbering measures are suitable for th...