Wear characteristics and performance of multi-layer CVD-coated alloyed carbide tool in dry end milling of titanium alloy
Wear characteristics and performance of multi-layer CVD-coated alloyed carbide tool in dry end milling of titanium alloy
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DOI：
10.1016/j.surfcoat.2005.07.063
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发表时间：
2006-05
影响因子：
5.4
通讯作者：
M. Nouari;A. Ginting
中科院分区：
文献类型：
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作者：
M. Nouari;A. Ginting
本文研究了合金硬质合金刀具在干切削航空发动机常用钛合金Ti-6242 S时的性能。使用两种合金硬质合金刀片进行实验测试：未涂覆的硬质合金刀具（刀具A）和多层CVD涂覆刀具（刀具B）。在各种切削条件下，对两种刀具的刀具失效模式和磨损机理进行了研究。局部后刀面磨损（VB）被认为是两种工具A和B的主要工具磨损。在VB接近0.3 mm时，观察到脆性断裂（开裂、剥落和碎裂），观察到明显的塑性变形，并观察到涂层分层现象。粘附磨损（磨损和擦伤）和扩散磨损是工具A和B的磨损机理。涂层分层是刀具B的初始磨损模式;它发生在几秒钟的切削时间之后。从刀具寿命和表面光洁度两个方面分析了未涂层和多层CVD涂层合金硬质合金刀具的性能。通过对摩擦学参数和切屑分割的有限元分析，对涂层分层的物理机制提出了新的建议。
This paper deals with a study on the performance of alloyed carbide tools during dry machining of the titanium alloy Ti-6242S, commonly used for aeroengines. Experimental tests were conducted using two kinds of alloyed carbide tool inserts: the uncoated carbide tool (tool A) and the multi-layer CVD-coated tool (tool B). Tool failure modes and wear mechanisms for both tools were examined at various cutting conditions. The localized flank wear (VB) was found to be the predominant tool wear for both tools A and B. At VB close to 0.3 mm, a brittle fracture (cracking, flaking and chipping) was noted, a plastic deformation was significantly observed and a phenomenon of coating delamination was noticed. Adhesion wear (attrition and galling) and diffusion wear have been the wear mechanisms of tools A and B. Coating delamination was the initial wear mode of tool B; it occurred after a few seconds of cutting time. The performance of the uncoated and the multi-layer CVD-coated alloyed carbide tools was analyzed in terms of tool life and surface finish. Thanks to the Finite Element Analysis (FEA) on the tribological parameters and on the chip segmentation, a new proposal on the physical mechanisms of coating delamination was carried out.