对于许多高硬度和高抗唐性的金属材料来说,一个很大的困难就在于钻孔。到目前为止,除了巳采用的等离子电弧穿孔或电火花加工以外,其它的有效加工方法,尚未见使用。现在,英国维达普雷特(Videplate)有限公司,生产了一种新型合金钢钻头。把这种钻头安装在一台普通的台式钻床上,能轻易地钻通一些含锰量高达14%的特硬合金钢板。其硬度几乎与虹宝石14一样。此外,这种钻头只要在普通砂轮机上就能进行 For many high hardness and high resistance to the metal material, a big difficulty lies in the drilling. Until now, other than the plasma arc perforation or EDM that have been used, other effective processing methods have not been used yet. Now Videplate Ltd., UK, produces a new alloy steel drill bit. Mounting the drill bit on an ordinary bench drill makes it easy to drill through hard alloy plates containing up to 14% manganese. Its hardness is almost the same as the iridescent 14. In addition, this type of drill can be performed on a conventional grinder alone