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一、前言近年来国内外在深孔加工技术上有较大发展。深孔加工(L/D≥10)致力于缩短加工时间,发展了单刃、多刃扩钻、单刃空心钻、深孔钻等,这些钻头成功地解决了深孔加工的排屑、冷却和刚性等问题,提高了刀具寿命和加工效率。但上述钻头的使用,除对机床刚性、功率等有较高要求外,还需增设特殊的润滑液供给装置,所以国内使用不多,孔加工领域中高速钢麻花钻仍占主导地位。过去国内在麻花钻方面的工作,大都是研究其切削刃的修磨(如“群钻”等)。实践表明,普通麻花钻适当的切削刃修磨,使难切削材料的加工比较容易,但效果毕竟不很理想。另外没有适应于现场生产的钻头刃磨机,所以在大批量生产中未起很大作用。国外研制成一次钻深达(5～20)D深孔加工用的
I. Introduction In recent years, deep hole processing technology at home and abroad have greater development. Deep hole machining (L / D≥10) is devoted to shorten the processing time, the development of single-edge, multi-edge drilling, single-blade hollow drill, deep hole drilling, these drill bits successfully solve the deep hole machining chip, cooling And rigidity and other issues, improve the tool life and processing efficiency. However, the use of the above drill bit, in addition to the high rigidity of the machine tool, power and other higher requirements, but also need to add a special lubricant supply device, so less domestic use, hole processing in the field of high-speed steel twist drill is still dominant. In the past, the work on twist drill in China mainly focused on the grinding of cutting edges (such as “group drilling”, etc.). Practice shows that the ordinary twist drill proper grinding of the cutting edge, so difficult to cut the processing of materials is relatively easy, but the effect is not very satisfactory after all. In addition, there is no bit sharpening machine adapted to the on-site production, so it does not play a significant role in mass production. Developed abroad to drill a deep (5 ~ 20) D deep hole processing