Cutting force, chip formation, and tool wear during the laser-assisted machining a near-alpha titanium alloy BTi-6431S
Cutting force, chip formation, and tool wear during the laser-assisted machining a near-alpha titanium alloy BTi-6431S
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DOI：
10.1007/s00170-015-6917-5
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发表时间：
2015-03
期刊：
影响因子：
--
通讯作者：
Y. Gao;Gui Wang;M. Bermingham;M. Dargusch
中科院分区：
文献类型：
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作者：
Y. Gao;Gui Wang;M. Bermingham;M. Dargusch
BTi-6431S是一种有前途的航空发动机和超音速飞机零件应用材料。但由于该合金在高温下具有较高的机械性能，其切削加工性相对较差。激光辅助加工 (LAM) 是一种很有前途的解决方案，可在加工难切削材料（例如 Ti-6Al-4V 合金）时降低切削压力。在本文中，从切削力、切屑形成和刀具磨损方面研究了这种近α合金在不同激光功率条件下和一系列切削参数下的切削加工性。这项研究表明，与 Ti-6Al-4V 相比，BTi-6431S 合金对 LAM 的响应要低得多，并且对 BTi-6431S 使用 LAM 工艺并没有延长刀具寿命。传统加工（CM）条件下刀具的主要失效模式是后刀面磨损和前刀面崩刃，而LAM条件下刀具的主要失效模式是扩散磨损。 BTi-6431S近α钛合金的切削加工性明显低于Ti-6Al-4V合金。
BTi-6431S is a promising material for aero-engine and supersonic speed aircraft parts application. However, the machinability of the alloy is relatively poor due to its high mechanical properties at high temperature. Laser-assisted machining (LAM) is a promising solution to reduce the cutting pressures when machining difficult-to-cut materials, such as Ti-6Al-4V alloy. In this paper, the machinability of this near-alpha alloy has been investigated in terms of cutting force, chip formation, and tool wear in different laser power conditions over a range of cutting parameters. This investigation shows that the BTi-6431S alloy is considerably less responsive to LAM compared to Ti-6Al-4V, and the tool life was not extended by using the LAM process for BTi-6431S. The main tool failure mode is flank wear and rake face chipping under conventional machining (CM) condition, while the diffusion wear is the main tool failure mode under LAM. The machinability of BTi-6431S near-alpha titanium alloy is significantly lower than that of Ti-6Al-4V alloy.