It is found that theoretical results of extrusion force given by the two calculating formulas using upper bound theorem ar.
本文推导的挤压力理论计算公式具有一定的工程实用性，为挤压模具的设计和挤压工艺的制定提供了理论依据。
It is found that theoretical results of extrusion force given by the two calculating formulas using upper bound theorem ar.
本文推导的挤压力理论计算公式具有一定的工程实用性，为挤压模具的设计和挤压工艺的制定提供了理论依据。
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