roto broaching titanium

[RandleXX]

I am about to try using a rotary broach to put a 20 tooth x 3/8 dia. spline in Ti and was wondering if anyone on here has had any experience doing this. Is this difficult to do?

 

This is a through hole about .125 deep.

 

Any tips or recommendations would be greatly appreciated.

 

Thanks,

Randle

[Kevin Goddard]

We rotary broach hex in Ti often, no problem. Like most things in life, the end result is a product of preparation. Make sure everything is dialed in, on center, proper hole size with a lead in chamfer larger than the major od. Slater's feed and speed recommendations have worked well for us. Not that it matters much but lathe or mill?

[RandleXX]

We rotary broach hex in Ti often, no problem. Like most things in life, the end result is a product of preparation. Make sure everything is dialed in, on center, proper hole size with a lead in chamfer larger than the major od. Slater's feed and speed recommendations have worked well for us. Not that it matters much but lathe or mill?

 

This is on a mill.

 

What type of tool material did you use? It looks like Slater recommends M2 tool Steel. Just wondering how this holds up in Ti.

 

Thanks,

[Kevin Goddard]

M2 works fine. Rotary broaching does not generate much heat.

[PolygonSolutions]

For the most part broaching titanium is challenging and not easy to do. Some of our rotary broach customers have had to slow down the recommended speeds and feeds just to make a few parts, and upgrade the material to a tougher tool steel like M-42 or PM T-15. Chipping on the sharp corners is usually the first failure. But the most interesting adjustment is in the rake angle. If you end up having any difficulties, try grinding the face of your broach flat before you buy a new one and test it out if possible. Your application may work better with little to no rake angle. This is not really well documented in the industry, but a few people are doing it. Sounds like Kevin knows his stuff.

[chip]

I've never seen this on a mill, but if its anything like a broach, maching doesn't this operation need some serious horsepower? Its not hard on the screws? Broaches have that taper (ore lead) angle. You guys got pics? :headscrach:

[taperlength]

I've never seen this on a mill, but if its anything like a broach, maching doesn't this operation need some serious horsepower? Its not hard on the screws? Broaches have that taper (ore lead) angle. You guys got pics? :headscrach:

 

 

Chip, google "rotary broach".

[chip]

Kuhl.....

[Müřlıń®]

Kuhl.....

Youtube has a bunch of broaching vids.

[chip]

I saw the vids from skater tools. Randallxx said 4th axis mill. Some of the mill/turn guys refer to the spindle as 4th.

[RandleXX]

We have been successfully broaching Ti using the Slater Tools.. Works very well. We have not ran enough quantity to fully test tool life, but everything looks good so far.

 

Specs:

 

Broach is 20 tooth "star shape" about 3/8 dia. PM4 Cobalt.

 

800 RPM @ .003 IPR

 

Material being cut is 6AL4V Titanium Cast

 

Machine: Haas VF6

[PolygonSolutions]

video.

 

(bridgeport)