在组合机床上钻削加工是最普遍和工作量最大的加工工序。在韧性材料和工艺性差的难加工材料上钻孔,特别是钻深孔十分困难。 在结构和工艺上有特殊要求的重要机械零件现在都广泛采用高强度钢、高合金钢、耐热钢、不锈钢、钛合金钢、铌合金钢。所有上述这些难加工材料都具有韧性高、导热性低的特点,而且表面易于产生冷硬现象,加工时刀具经常产生切屑瘤。另外,在这样的材料上钻孔时排屑和要把冷却液直接输送到切削区是很困难的。为此就必须采用降低切削用量、多次退 Drilling on the combined machine is the most common and labor-intensive machining operation. It is very difficult to drill holes in ductile materials and difficult-to-process materials, especially for deep hole drilling. Important mechanical parts that have special requirements on structure and technology are now widely used in high strength steel, high alloy steel, heat resistant steel, stainless steel, titanium alloy steel and niobium alloy steel. All of these difficult to process materials have high toughness, low thermal conductivity, and the surface is prone to chill phenomenon, the tool often produces cutting edge when processing. In addition, chip evacuation on such materials and the ability to deliver coolant directly to the cutting zone can be difficult. To this end, we must reduce the amount of cutting, repeatedly