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Machining performance of PCD and PCBN tools in dry turning titanium alloy Ti-6Al-0.6Cr-0.4Fe-0.4Si-0.01B

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Abstract

Titanium alloys are typical difficult-to-machine materials. The experiment is conducted by turning Ti-6Al-0.6Cr-0.4Fe-0.4Si-0.01B (TC7) with PCD and PCBN tools under dry condition. The paper focuses on studying the performance of PCD tools in dry turning TC7 and investigating the machinability of TC7. Wear mechanisms of two cutting tools are analyzed and compared by scanning electronic microscopic (SEM) images of worn inserts. The effect of cutting parameters (cutting speed, feed rate and depth of cut) on tool life is studied by measuring the average flank wear with 3D super-depth-of-field instrument. The influence of cutting parameters on cutting temperature, surface roughness, and surface microhardness is also investigated. The results show that although non-uniform wear band forms on both tools of PCD and PCBN, the wear of PCBN is serious than that of PCD. The adhesion-dissolution-diffusion mechanism takes effect on two tools during machining. For PCD tool, obvious adhesion and chipping occur. For PCBN tool, adhesion, notching, and crater occur. The main conclusion is that PCD tool has better performance than PCBN tool. PCD tool is suitable for machining TC7. The machinability of TC7 is poorer than that of TC4. The hardening of workpiece surface layer occurs.

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Authors and Affiliations

  1. Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials (Building 38), South China University of Technology, No. 381 Wushan Road, Tianhe District Guangzhou, 510640, China

    Zhaojun Ren, Shengguan Qu, Yalong Zhang, Xiaoqiang Li & Chao Yang

  2. The Key Laboratory of High Efficient Near-Net-shape Forming Technology and Equipments for Metallic Materials, Ministry of Education, China (category B), Guangzhou, 510640, China

    Zhaojun Ren, Shengguan Qu, Yalong Zhang, Xiaoqiang Li & Chao Yang

  3. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China

    Zhaojun Ren, Shengguan Qu, Yalong Zhang, Xiaoqiang Li & Chao Yang

  4. Intelligent Manufacturing Institute of HNUST, Hunan University of Science and Technology, Xiangtan, 411201, China

    Fujian Sun

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  1. Zhaojun Ren
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  2. Shengguan Qu
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Correspondence to Shengguan Qu.

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Ren, Z., Qu, S., Zhang, Y. et al. Machining performance of PCD and PCBN tools in dry turning titanium alloy Ti-6Al-0.6Cr-0.4Fe-0.4Si-0.01B. Int J Adv Manuf Technol 102, 2649–2661 (2019). https://doi.org/10.1007/s00170-018-3074-7

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