lightsaber wrote:Even titanium compressor blades are slow for each blade. The machines rotate the part every which way to acheive optimized shape.
Much faster to have dozens of machines making the blades. Otherwise you tie up a $200,000 rotor for months.
Repair is easy. EDM off the blade (machine #1). Machine down the boss to specifications (machine #2). Heat treat? Friction weld on new blade in machine #3 then heat treat (2nd time?)
Blisks are titanium, there is no need for cold section parts to be CMC. The turbine blades remain individual blades. There is not yet a blisk turbine in a high compression ratio engine, the technology is not there, yet.
Blades must be individually surface treated and heat treated prior to friction welding. Titanium is a finicky material.
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