patrickjp93
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Posts: 389
Joined: Thu Aug 22, 2019 12:00 pm

Blisks: Can We Cut From Whole Cloth?

Wed Sep 25, 2019 2:51 pm

A big thing GE has been touting with their additive manufacturing has been reduction of part counts, reduction of weight, and greater part longevity. So, given they intend to make turbine blades and blisks from CMCs, is it feasible to print the ENTIRE blisk in-place? Or do the blades wear out at such a significantly faster rate that it's better to just stay with the current multi-part assembly system?
 
superbizzy73
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Joined: Wed Sep 30, 2009 5:43 am

Re: Blisks: Can We Cut From Whole Cloth?

Sun Sep 29, 2019 1:27 am

Just devil’s advocate, but what would happen if one blade was damaged? Repair technology has improved over the years, but something like a blade with that much rotational mass would definitely put a lot of stress on the repair. The idea of a single unit like that would look absolutely amazing, and probably weigh a lot less, though. Maybe technology will find a way.
 
WIederling
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Re: Blisks: Can We Cut From Whole Cloth?

Sun Sep 29, 2019 10:19 am

How do you go about surface damage to CMC parts?
Murphy is an optimist
 
superbizzy73
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Joined: Wed Sep 30, 2009 5:43 am

Re: Blisks: Can We Cut From Whole Cloth?

Tue Oct 01, 2019 7:48 am

My bad, I was thinking composites. Now my interest is piqued...I wonder if there is any way to repair a CMC part?
 
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lightsaber
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Re: Blisks: Can We Cut From Whole Cloth?

Wed Oct 09, 2019 1:21 am

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?)

Lightsaber

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.

Lightsaber
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patrickjp93
Topic Author
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Re: Blisks: Can We Cut From Whole Cloth?

Wed Oct 09, 2019 10:14 am

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?)

Lightsaber

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.

Lightsaber


So what does GE mean by having rotating CMC parts in the GE9X? Just the blades that are actually in the combustion area? Wouldn't the immediate surface they attach to ALSO need to be CMC for it to hold up under the same heat?

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