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首页> 外文会议>North American Manufacturing Research Conferece >Investigating tool wear mechanisms in machining of Ti-6Al-4V in flood coolant, dry and MQL conditions
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Investigating tool wear mechanisms in machining of Ti-6Al-4V in flood coolant, dry and MQL conditions

机译：洪水冷却剂，干燥和MQL条件下TI-6AL-4V加工工具磨损机制

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The objective of this study is to identify and explain tool wear mechanisms that dominate during machining of titanium alloy Ti-6Al-4V in dry, flood coolant, and minimum quantity lubrication (MQL) conditions. A series of experiments were conducted using end milling of Ti-6Al-4V by varying feed rate and depth of cut, while the cutting speed was kept constant at comparatively higher cutting speed. Both uncoated and titanium aluminum nitride (TiAlN)-coated carbide tools were used for machining Ti-6Al-4V at the same settings of parameters. It was observed that abrasion was the most dominant tool wear mechanism for all dry, flood coolant and MQL machining conditions. Edge chipping and tool nose wear were the next dominating tool wear mechanisms in conventional flood coolant machining, which may be associated with the thermal fatigue caused by the periodic cooling of tool tip from the high temperature generated during machining. On the other hand, adhesion was the second most dominant tool wear mechanism in the dry machining. Both the edge chipping and adhesion of chips to the cutting tools were reduced significantly in MQL machining. The delamination of coating film was observed when TiAlN-coated carbide tools were used for machining Ti-6Al-4V. The delamination was more significant in wet and MQL machining compared to dry machining, indicating the effectiveness of coated tools in dry machining condition compared to wet and MQL machining conditions. Among three conditions, MQL provided the least occurrences of tool wear, indicating suitability of MQL in productive machining of titanium alloys.
机译：本研究的目的是识别和解释在干燥，泛粉冷却剂和最小量润滑（MQL）条件下在加工钛合金Ti-6Al-4V时主导的工具磨损机制。通过不同的进料速率和切割深度使用Ti-6Al-4V的端铣，在切割速度下进行一系列实验，而切割速度在相对较高的切削速度下保持恒定。未涂层和氮化钛（TiAlN）涂料的碳化物工具都用于在相同的参数设置下加工Ti-6Al-4V。观察到磨损是所有干燥，洪水冷却剂和MQL加工条件的最大主导的工具磨损机构。边缘切削和工具鼻磨损是传统的洪水冷却剂加工中的下一个主导工具磨损机构，其可以与由在加工过程中产生的高温引起的工具尖端的周期性冷却引起的热疲劳。另一方面，粘合性是干燥加工中的第二个最主导的工具磨损机构。在MQL加工中，芯片对切削工具的边缘碎裂和粘附性均显着降低。当使用Tialn涂覆的碳化物工具用于加工Ti-6Al-4V时，观察到涂膜的分层。与干燥加工相比，湿法和MQL加工中的分层在干燥加工相比，表明与湿和MQL加工条件相比，在干加工条件下的涂层工具的有效性。在三个条件中，MQL提供了刀具磨损的最小型材，表明MQL在钛合金生产性加工中的适用性。

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