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在钻削过程中,尤其是加工铸铁材料时,往往出现这种情况:当进给量较大、钻孔数量较多时,在钻头切削刃前面和后面常出现一片黑色的薄膜,紧紧地粘结在主刀面上,厚约0.3～0.6毫米,宽约5～10毫米,长度几乎占据了整个外刃及外缘转角处。这种黑皮是由于钻头处于封闭式连续钻削、细碎切屑的粉末砂粒和切削刃前面、后面剧烈摩擦及冷却液中乳化油成分受热烧焦、切削条件较差而产生的。这不是钻头切削部分已经磨损,也不同于钻削时产生的粘刀、刀瘤现象及铸造缺陷时的氧化层黑皮。用下述方法
This is often the case during drilling, especially when machining cast iron, when a large amount of feed and a large number of holes are drilled, often with a black film in front of and behind the cutting edge of the bit, Knot in the main surface, the thickness of 0.3 to 0.6 mm, width of 5 to 10 mm, the length of almost occupy the entire outer edge and the outer edge of the corner. This black leather is due to the drill in a closed continuous drilling, fine chip dust grit and cutting edge in front of the back of the severe friction and cooling oil emulsified oil components heated charred, cutting conditions resulting from poor. This is not the drill bit has been worn part of the cut, but also different from the drilling when the stick knife, knife phenomenon and casting defects black oxide layer. Use the following method