最近,我厂接受了一批变压器制造任务,其中变压器箱盖上有三个直径为70毫米的高压瓷瓶孔和一个直径为46毫米的分节开关孔,箱盖厚达6毫米。过去加工这些孔采用钻床锪孔,工效低。我厂锻工组的同志,充分利用锻造设备,制造两副简单的冲孔模(见图),在150公斤空气锤上进 Recently, our factory has accepted a number of transformer manufacturing tasks, in which the transformer cover has three high pressure porcelain holes with a diameter of 70 mm and a section switch hole with a diameter of 46 mm. The lid is 6 mm thick. In the past, these holes were drilled with countersinks, which resulted in low work efficiency. Our comrades forging work group, make full use of forging equipment, making two simple punching die (see photo), in the air hammer on the 150 kg