顶镦即是利用压缩加工增加坯料头部横断面积的方法。有很多长杆类零件,如螺栓、螺钉等,长径比l/d很大,有的高达20～30以上,如图1所示。材料多为中碳钢或合.针对以上情况,我们专门设计制造了一种立式回转两工位顶墩模具,在J23一60曲柄压力机上使甩,取得了满意的效果。 1.模具结构. 主要设计思想是,针对曲柄压力机行程短和封闭高度小的特 Top-heading is the use of compression processing to increase the cross-sectional area of ​​the billet head method. There are many long rod parts, such as bolts, screws, etc., l / d l / a large, and some as high as 20 to 30, as shown in Figure 1. In the light of the above situation, we specially designed and manufactured a vertical rotary two-station top pier mold, which was thrown on the J23-60 crank press and achieved satisfactory results. 1. Die structure. The main design idea is that for the crank press stroke is short and the closure of a small height of special