某厂青年钳工倪志福同志,在1953年10月改进了钻头的几何形状,创造了一种新型钻头。这种钻头的生产效率高,使用寿命长,最适合于钻削钢料,特别是塑性较大的合金钢料。这种钻头磨制方便,一般钳工15分钟就可学会,所以在我厂已获得广泛应用。新型钻头的几何形状倪志福同志所创造的新型钻头的几何形状,和普通钻头的几何形状比较起来(如图1),有如下的四个特点: Comrade Ni Zhifu, a young fitter at a factory, improved the bit geometry in October 1953 and created a new type of bit. This bit of high productivity, long service life, the most suitable for drilling steel, especially plastic larger alloy steel. This drill grinding convenience, the general fitter can learn 15 minutes, so I have been widely used in the plant. The geometry of a new drill Bit Comrade Ni Zhifu created a new type of drill geometry, compared with the common bit geometry (Figure 1), has the following four characteristics: