What's new
What's new

stress relieving mic6

tay2daizzo8

Hot Rolled
Joined
Nov 8, 2013
Location
north of Bean town
hey all i got a job going and im trying to get flatness in
material is mic6
finish thickness is .283
parts are 25.00 x 13.5
i have to hold .0059 flatness across one side.
im having mixed results, some parts are .006-.008 while others are .015 flat
the pattern of warping is different with each part
im fairly sure the parts are bending on the 2nd op(taking off the stock on)
because the plates are parallel to within .004 all the way around
ive tried multiple ways of fixturing and clamping with no real luck.

I was thinking of stress relieving the plates in my oven (375F for 4 hours)
I use this process with some 8" dia disks and im able to hold .0002 flat on those

Anybody ever stress relieve mic6 with good results
 
hey all i got a job going and im trying to get flatness in
material is mic6
finish thickness is .283
parts are 25.00 x 13.5
i have to hold .0059 flatness across one side.
im having mixed results, some parts are .006-.008 while others are .015 flat
the pattern of warping is different with each part
im fairly sure the parts are bending on the 2nd op(taking off the stock on)
because the plates are parallel to within .004 all the way around
ive tried multiple ways of fixturing and clamping with no real luck.

I was thinking of stress relieving the plates in my oven (375F for 4 hours)
I use this process with some 8" dia disks and im able to hold .0002 flat on those

Anybody ever stress relieve mic6 with good results

Are the 8" diameter discs also MIC-6?
 
At that temperature I'd expect you'll remove the temper, leaving it even softer and more obnoxious to machine. If that's not an issue then try the SR, then look at using a vacuum fixture for controlling the plate during thickness machining. You may have to shim and tape any leaks as an intermediate step before you get good final flatness. Put in any holes or through features after flatting.
 
thanks milland..unfortunately vacuum isnt happening..but i was hoping the heat would relieve the temper..wasnt sure because it was cast and not rolled or formed.
im roughing the thickness to .01 over and finishing the other details.
then ill stick them in my easybake for 4 hours and then dust the final .01
peace of cake...i hope
 
It's not a surprise the discs warp, but the MIC-6 is cast so it should be okay. We routinely machine 12" x 22" x 5/8" MIC-6 without any problems. How are you holding them?
 
ive tried
clamping in vice
bolting down thru cbore holes in part
toe clamping

the flatness i called out at .0059 to the profile of 3 points on the part(2 at one end and 1 at the other)

i have to zero at 3 places one the surface then sweep the rest of the surface with 10N applied to each point.
 








 
Back
Top