Li Hui, Gao Feng, Li Yan, Bai Lijing
Key Laboratory of NC Machine Tools and Integrated Manufacturing Equipment of the Ministry of Education, Xi'an University of Technology, Xi'an 710048, China.
Department of Mechanical, Henan University of Engineering, Zhengzhou 451191, China.
Materials (Basel). 2022 Jun 17;15(12):4302. doi: 10.3390/ma15124302.
Nickel-based superalloy is regarded as one of the materials with the poorest cutting and drilling performance. Additionally, there is much less research on the drilling of it. This paper aims to study the drilling performance of dry drilling nickel-based superalloy with uncoated and CrAlYN coated carbide bit. First of all, the primary and secondary factors influencing the machining performance of dry drilling nickel-base superalloy uncoated carbide bit were explored through an orthogonal test. Secondly, the self-prepared CrAlYN coated carbide drills, and uncoated drills were compared and analyzed from perspectives of service life, drilling force, drilling temperature, drill surface topography, failure mechanism, and machining surface quality. The research results are as follows: the drilling temperature is the primary factor affecting the drilling performance under dry drilling conditions. CrAlYN coating can obviously prolong the service life of tools, reduce the drilling force and drilling temperature, and improve the machining surface quality at lower rotational speeds. Moreover, the coated cemented carbide bit has a similar failure mode to the uncoated cemented carbide bit after the CrAlYN coating falls off in the wear zone of cemented carbide bit, which is mainly bonding wear on the rear tool surface and the front tool surface.
镍基高温合金被认为是切削和钻孔性能最差的材料之一。此外，针对其钻孔的研究也少得多。本文旨在研究使用未涂层和CrAlYN涂层硬质合金钻头干式钻削镍基高温合金的钻孔性能。首先，通过正交试验探究了影响干式钻削镍基高温合金未涂层硬质合金钻头加工性能的主次因素。其次，从使用寿命、钻削力、钻削温度、钻头表面形貌、失效机理及加工表面质量等方面对自制的CrAlYN涂层硬质合金钻头与未涂层钻头进行了对比分析。研究结果表明：在干式钻削条件下，钻削温度是影响钻孔性能的主要因素。CrAlYN涂层能够显著延长刀具使用寿命，降低钻削力和钻削温度，并在较低转速下提高加工表面质量。此外，在硬质合金钻头磨损区域CrAlYN涂层脱落之后，涂层硬质合金钻头与未涂层硬质合金钻头具有相似的失效模式，主要是刀具后刀面和前刀面的粘结磨损。
