Glossary
What are transonic airfoils, and what is the active clearance control? Check out our technical dictionary and find out more about engine technology terms – from active clearance control to velocity triangle.
HAE "Hell"
"Hard" anodizing
Hard chrome-plating
Hardening and tempering
Hardfacing
Heat exchanger
High-pressure compressor
High-pressure turbine
High-speed milling
High-temperature vacuum brazing
Hot isostatic pressing (HIP)
Hypersonic aircraft
High-speed milling
High-speed milling is used, for example, to machine the titanium rotors of the first high-pressure compressor stages of the EJ200 engine. The process allows cost-effective milling of the airfoil geometry from the solid. The specified surface finish is achieved by a subsequent finishing operation. The high-speed milling machines required for the process must be fitted with an axis movement system suitable for machining blisks (at least 5 axes simultaneously, depending on the milling task involved) and an efficient high-speed control system.
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