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Tighter turbine tolerances

机译：涡轮公差更严格

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THREE turbine components are produced at Burnley-based Teleflex Aerospace using the 'Viper' grinding process. Two are stage-one nozzle guide vanes for Siemens Industrial Turbomachinery in Finspong, Sweden; the other is a shrouded turbine blade for Rolls-Royce in Derby. The machine tool used is a Makino ASS HMC; to meet tolerance and to avoid burning, finish grinding employs Saint-Gobain wheels. The heat-sensitive Inconel 939 nozzle guide vanes are produced in two set-ups. Clogging of the wheel -with sticky swarf had led to problems during final grinding, including surface cracking and porosity, and difficulty in holding fine edge features. The solution, says customer service/quality manager Phil Chadwick was to replace the wheel for final grinding with a Saint-Gobain Vortex: 'It is one of the most open-grained aluminium oxide wheels on the market and is able to maintain a sharp, accurate profile with minimal heat generation, even when machining difficult metals.' A patented process ensures that coolant is readily absorbed arid diffused to the point of cutting. The temperature of the long alloy chips is o thus kept low, minimising clogging of the cutting edge.
机译：使用'Viper'研磨工艺在伯恩利的Teleflex航空航天公司生产了三种涡轮机部件。其中两个是瑞典Finspong的Siemens Industrial Turbomachinery的一级喷嘴导流叶片;另一个是Derby的Rolls-Royce的带护罩的涡轮叶片。使用的机床是Makino ASS HMC;为了达到公差并避免燃烧，精磨使用了Saint-Gobain砂轮。热敏性Inconel 939喷嘴导向叶片有两种设置。砂轮因粘着的切屑而堵塞，导致最终磨削时出现问题，包括表面裂纹和孔隙率，以及难以保持精细的边缘特征。客户服务/质量经理Phil Chadwick说，该解决方案是用Saint-Gobain Vortex代替砂轮进行最终磨削：“它是市场上最开粒的氧化铝砂轮之一，能够保持锋利，即使在加工难加工的金属时，也能以最小的热量产生精确的轮廓。获得专利的工艺可确保冷却剂易于吸收并扩散到切割点。长合金切屑的温度因此保持较低，从而最大程度地减少了切削刃的堵塞。

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