An overview of the machinability of aeroengine alloys
An overview of the machinability of aeroengine alloys
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DOI：
10.1016/s0924-0136(02)01042-7
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发表时间：
2003-03-10
影响因子：
6.3
通讯作者：
Yamane, Y
中科院分区：
文献类型：
--
作者：
Ezugwu, EO;Bonney, J;Yamane, Y
航空发动机合金、结构陶瓷和淬硬钢等先进材料因其独特的高温强度、硬度和化学耐磨性等性能组合，在加工过程中对刀具材料提出了严峻的挑战。虽然这些特性是理想的设计要求，但由于加工过程中产生的高温和应力，它们对制造工程师提出了更大的挑战。这些合金的导热性较差，导致高温集中在刀具-工件界面。这在更高的切割条件下会变得更糟，因为刀具的强度和硬度会显著降低。这削弱了刀具基板的结合强度，从而通过机械(磨损和磨损)和热相关(扩散和塑性变形)机制加速了刀具磨损。因此，用于加工航空航天材料的刀具必须能够在高速加工中遇到的更高的切削温度下保持其硬度和其他机械性能。硬质合金(包括涂层硬质合金)、陶瓷和立方氮化硼(CBN)等硬度提高的刀具材料是最常用于加工航空发动机合金的材料。尽管CBN刀具具有优异的硬度和切削性能，但由于其成本低得多，陶瓷刀具通常是高速连续加工的首选刀具。最新的加工技术也可以提高加工生产率，如坡度或锥度车削和回转加工。这些技术通常会最小化或完全消除刀具的主要缺口，从而在加工航空发动机合金时导致整个刀具刃口的灾难性断裂。(C)2002 Elsevier Science B.V.保留所有权利。
Advanced materials such as aeroengine alloys, structural ceramics and hardened steel provide a serious challenge for cutting tool materials during machining due to their unique combinations of properties such as high temperature strength, hardness and chemical wear resistance. Although these properties are desirable design requirements, they pose a greater challenge to manufacturing engineers due to the high temperatures and stresses generated during machining. The poor thermal conductivity of these alloys result in concentration of high temperatures at the tool-workpiece interface. This is worsened at higher cutting conditions because of the significant reduction in the strength and hardness of the cutting tool. This weakens the bonding strength of the tool substrate, thereby accelerating tool wear by mechanical (abrasion and attrition) and thermally related (diffusion and plastic deformation) mechanisms. Therefore, cutting tools used for machining aerospace materials must be able to maintain their hardness and other mechanical properties at higher cutting temperatures encountered in high speed machining.Tool materials with improved hardness like cemented carbides (including coated carbides), ceramics and cubic boron nitride (CBN) are the most frequently used for machining aeroengine alloys. Despite the superior hardness and cutting performance of CBN tools, ceramic tools are generally preferred for high speed continuous machining because of their much lower cost. Improvements in machining productivity can also be achieved with the latest machining techniques such as ramping or taper turning and rotary machining. These techniques often minimise or completely eliminate the predominant notching of the cutting tools, consequently resulting in catastrophic fracture of the entire cutting edge when machining aeroengine alloys. (C) 2002 Elsevier Science B.V All rights reserved.