Line Reaming

[machinedudester]

Does anyone have experience doing line reaming through titanium and aluminum at the same time. I am concerned that the titanium chips will become lodged in the aluminum and ruin the part. They are extreemly expesive parts so ruining one is out of the question. They are also roller burnished after line reaming. Any advise is greatly appreciated.

[machinedudester]

That is expensive not expesive. My bad!!

[robk]

Is boring instead of reaming an option? How about size milling instead or maybe interpolating?

[Superman]

Is it a thru or blind hole ?

 

Interpolate start of hole (.001" under reamer size )to true hole positions

 

Use reamers that push swarf into thru hole into uncut area ( suggest using cutting oil not coolant ) DO NOT rapid retract -( 4X feed )

[machinedudester]

They are through holes that need to leave .0004-.0008" for roller burnishing. Which makes me ask does anyone have experience doing roller burnishing?

[mike_f]

I've done a little roller burnishing and I would be a little concerned with trying to burnish those two materials together. roller burnishing is a forming operation and titanium is not going to "form" as easily as alum.

what size are these holes, I would be looking at coolant fed reamers if possible.

[GoetzInd]

quote:

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I would be a little concerned with trying to burnish those two materials together.

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I would be too depending on what size you need to hold.

[mike_f]

another thing to consider is that reaming is not always the best way to prep a hole for burnishing, you need those " hills and valleys " so to speak so the rollers have material ( the hills ) to form or roll down into ( the valleys ) sometimes the finsh from a reamer is too smooth to burnish properly. are you burnishing for size control or surface finish requirements ?

[Guest CNC Apps Guy 1]

Ditto to mike, you NEED a "rough" hole. A smooth hole is going to do nothing but make a mess and scrap the part.

 

HTH

[machinedudester]

So, what do you think? Floating or non-floating reamer for titanium.

[Ralph@Faustson]

WE need more information... what size is the bore, and how deep, and what surface finish is req'd?

[machinedudester]

It is the same part, the bore dia. 0.4375 the depth varies from 1/8"-1/2" and they get roller burnished after reaming.

[iowajim62]

I would drill them .390, circle mill them to .427 and bore them with diamond tipped bar to .4369-.4371.

[mike_f]

It really depends on alot of things, I've never really liked floating reamer holders, I've only used Lyndex though I'm sure there are better designs out there......I'm curious though, have you run any tests with the roller burnishing ? What brand tooling did you end up with ?

 

mike

[machinedudester]

First, thanks for all the advise. I have purchased a boring head and a mits. 5/16" boring bar and (CCGT21.51MJ-P RT9005) inserts. Can anyone suggest some feeds and speeds for boring 6AL-V4 annealled titanium? The holes are already at .375" and need to be bored to .4375" and then roller burnished to sized They are between .200"-.625" deep through holes. This is the first time I have machined this material, so I'll take all the advise that you can give, thanks.