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Failure mode analysis of carbide cutting tools used for machining titanium alloy

机译：钛合金加工硬质合金刀具的失效模式分析

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Intensive research on the performance of coated carbide tools in machining titanium alloy is being conducted worldwide. Titanium alloy has special characteristics such as high strength at elevated temperature and high mechanical resistance that makes carbide tools suitable to cut this material. This is because carbide tools are classified as hard and highly resistant to wear even at high temperature. This paper discusses the failure mode of a coated carbide cutting edge that is caused by the loading and unloading effect during milling. Tool failure adversely affects tool life, the quality of the machined surface and the surface's dimensional accuracy, and consequently the economics of cutting operations. The milling parameters that were observed to affect the failure of coated carbide tools were cutting speed, feed rate, depth of cut, and the application of a cutting fluid. Wear occurred along the flank and rake faces, which then propagated into the substrate material after the removal of the coating material. Wear along the flank and rake faces led to the concentration of stress over a certain area of the cutting edge, which was initiated by a microcrack and then propagated due to the loading and unloading effect during the intermittent milling process until significant brittle fracture occurred in the substrate material. Cutting speed and depth of cut were identified as the main factors responsible for the failure and fatigue of the coated carbide tools during the milling of titanium alloy.
机译：全球范围内都在对涂层硬质合金刀具加工钛合金的性能进行深入研究。钛合金具有特殊的特性，例如高温下的高强度和高机械阻力，使硬质合金刀具适合于切削这种材料。这是因为硬质合金刀具被归类为坚硬且即使在高温下也具有很高的耐磨性。本文讨论了由铣削过程中的加载和卸载效应引起的涂层硬质合金切削刃的失效模式。刀具故障会对刀具寿命，加工表面的质量和表面的尺寸精度产生不利影响，并因此影响切削操作的经济性。观察到的会影响涂层硬质合金刀具故障的铣削参数包括切削速度，进给速度，切削深度和切削液的施加。磨损发生在侧面和前刀面，然后在去除涂层材料后传播到基材中。沿侧面和前刀面的磨损导致切削刃某一区域的应力集中，该应力集中是由微裂纹引发的，然后由于间歇铣削过程中的加载和卸载作用而传播，直到在切削过程中出现明显的脆性断裂为止。基材材料。切削速度和切削深度被认为是造成钛合金铣削过程中涂层硬质合金刀具失效和疲劳的主要因素。

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