topic Blisk machining for RC turbine in Fusion Manufacture Forum

Blisk machining for RC turbine

Anonymous — Thu, 10 Aug 2017 14:28:41 GMT

Hi all,

I have a blisk that I created for a small (RC-sized) turbine, and am attempting to figure out if fusion360 can come up with appropriate toolpaths. After doing a quick search, most posts related to impellers were from the prior versions without any 5 axis simultaneous capabilities.

The problem I'm having is neither swarf cutting, nor multi-axis contouring seem to work for it. At one point, I was able to get a swarf path to be created around a blade, however it left a large amount of uneven stock on the airfoil, and completely avoided machining the leading edge- I'm assuming because swarf is trying to keep the endmill flat against some part of the surface. Is there a way to (efficiently) creatively make it machine the blades? With all the undercuts that I have, an indexed 5-axis path would take forever to machine (I think).

Am I missing something simple? Is there an alternate way to get this to work? For anyone interested, I've attached the model. A picture is also below.

Re: Blisk machining for RC turbine

Steinwerks — Thu, 10 Aug 2017 15:11:32 GMT

I think this is going to be very difficult for the current state of Fusion 360, but here's how I'd start messing with it:

3D Contour with Multiaxis Tilting enabled:

It would likely need multiple followup toolpaths, but as I'm no 5-axis guru, perhaps someone else can/will chime in to offer their experience on the matter.

Maybe @angelo.juras or @cj.abraham could chime in?

File attached.

Re: Blisk machining for RC turbine

Anonymous — Fri, 11 Aug 2017 02:44:07 GMT

Thanks for the hints- the good news is that I can independently reproduce your toolpaths. The bad news is it appears (like you said) that some follow-up toolpaths would still be required. I find it interesting that although multiaxis tlit is using all 5 axes, it isnt able to get into the undercut-type areas still- I'm not sure why that is.

Re: Blisk machining for RC turbine

Steinwerks — Fri, 11 Aug 2017 03:29:25 GMT

It may be able to, but as of yet the 5-axis toolpaths definitely need more fleshing out, but this is known and certainly on the map for improvement, but I wouldn't say there's anything on a specific timeline. You may be able to get better results than I have, that was just a quick attempt, and as I said, I am no 5-axis guru.