Cryogenic CO2 machining trials

The Nuclear AMRC is exploring the use of cryogenic coolant for civil nuclear machining, with the aim of improving machining efficiency and increasing tool life while minimising the risk of component failure. Cryogenic cooling uses extremely cold gas or liquid to control the heat generated during machining. Benefits can include reduced residual stress and thermal damage, improved surface roughness and longer tool life. Nuclear AMRC machining researchers have installed a carbon dioxide cooling system to the Hermle C60, a flexible five-axis mill-turn centre, and investigating its use in cutting a range of hard-to-machine metals, including steels, titanium and nickel alloys. CO2 can replace conventional coolant for many cutting tasks, and can potentially benefit processes which are usually run dry.