【摘要】 本文结合实际镦粗变形工艺，把镦粗变形划分为三个阶段或状态，即锻透、压实、焊合。指出空洞压实后的形态或痕迹与空洞的形状、大小，空洞与主拉形变的方向有关。坯料镦粗时仅仅考虑整体锻比是不够的，还必须注意单次压下量。并介绍了一种既能压实焊合空洞类缺陷，又能改善夹杂物分布的新型Ｖ型板墩粗工艺。更多还原

【Abstract】 This article, in the light of example upsetting process, divides upstting into three stages or phases which include through forging, densification and forge welding.It point out that the state after cavity densification is related with the cavity shape,size and the direction of mainly tensile deformation,the ratio of upsetting is not the only point when a forgings is upset, the unit reduction must be noticed.The article also introduces a new upsetting process with a V-Shape plate, which can not only remove cavity flows in pressing and welding but also improve the distribution of inclusion.更多还原