CFRP/Ti叠层构件钻削过程中硬质合金刀具磨损特性

摘要

为研究硬质合金刀具钻削CFRP/Ti叠层构件和钛合金时崩刃失效问题,采用硬质合金刀具对叠层构件和钛合金进行对比钻削试验,并对加工过程中的钻削力、钻削温度以及后刀面磨损长度进行分析,讨论刀具寿命不同的原因.结果表明:在相同条件下,与单独钻削钛合金相比,硬质合金刀具钻削CFRP/Ti叠层构件寿命更长;刀具发生崩刃失效之后,崩刃区被大量钛粘焊物覆盖,即刀具崩刃后导致切削力及切削温度的急剧增大,使得在崩刃区域极易产生粘焊现象;钻削CFRP/Ti叠层构件与钻削钛合金相比,由于CFRP板的存在,会延缓刀具崩刃失效现象,但是无法避免崩刃失效的发生.%To investigate the edge chipping during drilling of CFRP/Ti stack and titanium alloy with carbide cemented tools,the comparative drilling experiments were carried out. Drilling force, drilling temperature and tool wear were analyzed to research the reason of the different tool life. The results demonstrate that un-der the same conditions,the carbide cemented tool life of drilling CFRP/Ti stack is longer than titanium al-loy. After the tool failure occurs,the area of the edge chipping is covered with a large amount of Ti-adhe-sion. The phenomenon of the tool edge chipping causes the thrust force and drilling temperature to increase sharply. So the phenomenon of the adhesion is easily occurred at the edge chipping area. It is feasible to de-lay the edge chipping during drilling CFRP/Ti stack owing to the CFRP plate. But it is can′t be avoided the occurrence of chipping failure.