Anybody have experience machining mim Ti 6al-4v?

CAD/CAM/CNC
1

Morning, I just joined and really help . I am machining titanium 6al-4v. mim parts and they are behaving completely differently from the last set of titanium parts that were 3d printed. This seems to be the difference. I had no troubles with the 3d printed parts when completing the finale machining processes. With the MIM parts I keep breaking my endmills. I’m using titanium specific tooling at these rates for slot cutting: tool .125em 5 flute sfm: 162 rpm 4951 ipt .00029 feed 7.2
depth of cut max for tool is .0938 (this is the given 100 max values)
I have tried running at 50% to 100% of the given values. I have also talked with a few tool specialist and have used Helical’s speeds and feeds calculators to double check that I’m in the ball park and nothing is working.

Any experience with would be greatly appriciated.

2

You might want to try trochaidal milling or dynamic milling the slot with about .005 radial depth of cut with about .0005 IPT. If the slot finish’s at .125 wide drop down to .094 Dia. endmill for these tool paths. This has work for us in the past an you may even be able to speed it up more you just have to play with these tool paths to see what you can get away with far as speeding up the SFM and IPT up.

3

Thank you for that advice. I’ll look into that.