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一般落料冲模对制造的要求比較高;下模上面孔的尺寸,都是在整数后附有小数,如φ4.93,φ11.7,φ12.4,φ19.1等等,規格又不一致,直径小,要求精度很高,大部分是A_3～A,光洁度要求达▽▽▽_8以上,同时孔的几何位置不規則,所以它們是不能在車床上加工的。过去我們采用钻床钻孔后再铰光的办法,但现有铰刀不能滿足生产需要,因此影响了模具制造任务的完成。针对这种困难,我們想了很多办法来解决,其中以采用圓錐形压棒,利用挤压扩孔的原理来加工这些孔,是最令人滿意的。所謂挤压扩孔,就是把圆錐形压棒的小端插入已經钻好的下模孔中,并且在垂直方向加一定的压力,使圆錐形压棒同下模孔壁发生挤压;从而使孔壁附近的金属发生塑性变形,以达到扩孔的目的。
General blanking die on the manufacturing requirements are relatively high; the size of the upper die on the mold, are followed by a decimal integer, such as φ4.93, φ11.7, φ12.4, φ19.1 and so on, the specifications are inconsistent, Small diameter, high precision, mostly A_3 ~ A, finish requirements up to ▽ ▽ ▽ _8 above, at the same time the geometric position of the hole irregular, so they can not be processed in the lathe. In the past we used drilling drilling and then rewinding light, but the existing reamers can not meet the production needs, thus affecting the completion of the task of manufacturing molds. In view of this difficulty, we think of many ways to solve, among them the use of conical pressure rods, the use of the principle of extrusion reaming holes to process these holes is the most satisfactory. The so-called squeeze expansion, is to insert the small end of the conical pressure rod has been drilled into the lower die hole, and in the vertical direction plus a certain pressure, the conical pressure rod with the next hole wall extrusion; So that near the hole wall of the plastic deformation occurs in order to achieve the purpose of reaming.