The plastic process analyses on uniform and non uniform cylindrical upsetting were made in detail on the basis of the principle of generalized variational inequality with friction.

• 基于摩擦约束广义变分不等式原理,对圆柱体均匀镦粗和圆柱体非均匀镦粗等金属成形工艺问题进行详细的塑性加工工步分析。