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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Response of titanium aluminide alloy to abrasive waterjet cutting: geometrical accuracy and surface integrity issues versus process parameters
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Response of titanium aluminide alloy to abrasive waterjet cutting: geometrical accuracy and surface integrity issues versus process parameters

机译：铝化钛合金对水射流切割的响应：几何精度和表面完整性问题与工艺参数的关系

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摘要

Due to their low thermal conductivity, high abrasion of cutting edges and a tendency to crack during machining, titanium aluminide (TiAl) alloys are notoriously difficult-to-cut materials when using conventional (e.g. turning, grinding, drilling, milling) cutting operations. Despite their low machinability TiAl alloys find niche application areas in the manufacture of complex shaped components for aerospace gas turbine engines. Abrasive waterjet (AWJ) machining is one of the most promising non-conventional machining processes for difficult-to-cut materials because of the reduced mechanical and thermal damage to workpiece surfaces produced using this technique. However, there is no information about the AWJ machining of TiAl alloys in the open literature. Based on a generic design of an aeroengine component, this paper investigates the response of a TiAl alloy to AWJ cutting process variables to enable generation of high-integrity surfaces. The effects of operating parameters (pump pressure, material removal rate, abrasive flow rate, and stand-off distance) on the output process quality measures have been investigated as follows: geometrical accuracy (kerf straightness); surface roughness homogeneity (measured along cutting direction on the cutting front surface to study the striation formation); workpiece surface integrity (grit embedment and possible recast micro-layers or material pull-out / micro-cracking after cutting). Advanced surface topography and metallurgical (e.g. SEM, EDX) analyses have been carried out to characterize the response of TiAl alloy to various AWJ conditions leading to the fulfilment of quality criteria of a group of targeted aeroengine components. It was found that the AWJ process has a very high capability (e.g. satisfactory geometrical accuracy, surface quality, minimum surface anomies) to cut TiAl alloy despite grit embedment. However, the authors have addressed this problem by plain waterjet cleaning know-how. In addition, a surprising phenomenon (bubblelike 'TiO^sub 2^-based spot') caused by a strong exothermic reaction was found on the AWJ cut surfaces. [PUBLICATION ABSTRACT]
机译：由于铝钛（TiAl）合金的导热系数低，切削刃的高磨损性以及在加工过程中容易破裂的原因，众所周知，铝钛（TiAl）合金在使用常规（例如车削，磨削，钻孔，铣削）切削操作时难以切削。尽管TiAl合金的可加工性很低，但在制造用于航空燃气涡轮发动机的复杂形状零件中却找到了利基应用领域。磨料水射流（AWJ）加工是最有前途的非常规加工方法，用于难切削的材料，因为使用该技术减少了对工件表面的机械和热损伤。然而，公开文献中没有关于TiAl合金的AWJ加工的信息。基于航空发动机部件的通用设计，本文研究了TiAl合金对AWJ切削工艺变量的响应，以生成高完整性表面。操作参数（泵压力，材料去除率，磨料流速和支座距离）对输出过程质量度量的影响研究如下：几何精度（切缝平直度）；表面粗糙度均匀性（在切割前表面上沿切割方向测量以研究条纹形成）；工件表面完整性（砂粒嵌入和可能的重铸微层或切削后材料拉出/微裂纹）。已经进行了先进的表面形貌和冶金学（例如SEM，EDX）分析，以表征TiAl合金对各种AWJ条件的响应，从而满足一组目标航空发动机组件的质量标准。已经发现，尽管有粗砂嵌入，但AWJ工艺具有非常高的切割TiAl合金的能力（例如，令人满意的几何精度，表面质量，最小的表面异常）。但是，作者已经通过普通的水刀清洗技术解决了这个问题。此外，在AWJ切割表面上发现了由强烈的放热反应引起的令人惊讶的现象（类似“ TiO 2的气泡”）。 [出版物摘要]

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